WO2012095029A1 - Portable cutter - Google Patents

Abstract

Disclosed in the invention is a portable cutter which comprises an operating rod, a working assembly deposited at one end of the operating rod, a motor for actuating the working assembly and deposited about the working assembly, a transmission mechanism deposited between the motor and the working assembly. The working assembly comprises a pair of upper and lower saw blades which is deposited coaxially and rotated opposite to each other. A rotation of the motor is passed to the blades via the transmission mechanism, and the speed ratio between the motor and the blades is from 30:1 to 60:1. The motor outputs a high rotate speed, while the upper and lower saw blades output a low rotate speed. The blades of the portable cutter thus can work efficiently under a safe working condition, and the electricity consumption is low. Furthermore, the transmission mechanism between the motor and the working assembly has small volume and lightweight, which is advantageous for an operator to operate manually.

Description

 Handheld cutting machine

 The invention relates to a hand tool, in particular to an electric double saw blade cutting machine.

Background technique

 Hand-held cutting tools commonly used in the market, such as lawn mowers and trimming machines, generally use nylon threads instead of metal blades for trimming and cutting lawns. The cutting lines made of nylon or other materials are light in weight and easy to replace. Features are widely used in this type of cutting tool. However, since this type of cutting tool needs to output a higher-speed cutting line to perform the cutting work, there is often a large vibration and high noise defect in the hand-held operation. At the same time, due to the high-speed operation of the working head, when the grass hits the line Objects such as pebbles on the ground can splash out and affect the safety of the operator or others.

 The patent application of Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. A pair of upper and lower metal circular saw blades are disposed at the other end away from the engine. The operating rod is provided with a drive shaft for transmitting engine power, and a transmission speed reduction mechanism is provided between the cutting work and the drive shaft for rotating the drive shaft. Passed to the upper blade and the lower blade respectively, the upper blade and the lower blade rotate in opposite directions and the rotation speed is relatively low, and the teeth of the upper blade and the lower blade are in the rotation process of the upper and lower blades Form a scissors cut.

 The engine cutting machine can be used for outdoor cutting operations such as mowing and pruning. However, the exhaust gas generated by the combustion of the engine fuel during the working process will pollute the environment, generate loud noise and vibration, and the engine cutting machine. Its own weight is more than 20% than that of a DC or AC cutting machine. It is very easy for the operator to work fatigue for a long time; therefore, it is necessary to improve the existing hand-held electric double saw blade cutting machine.

Summary of the invention

 In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a hand-held double saw blade cutting machine with high cutting efficiency and safe operation.

 Another technical problem to be solved by the present invention is to provide an electric double saw blade cutting tool which is light in weight and convenient for hand-held operation, and which has a small-sized, lightweight transmission mechanism.

In order to solve the above technical problem, the technical solution of the present invention is implemented as follows: a hand-held cutting machine includes an operating lever, a working component disposed at one end of the operating lever, and a motor for driving the working component, the motor being disposed adjacent to the working component, a transmission mechanism disposed between the motor and the working component, the working component package ^一IJ ^fW T- JL JO- 3⁄43⁄4. if? force inj EI tl'-J Λ1 , / | 3⁄4L 4 t)', J US. li. 3⁄4/ -T^ 3⁄4 Ί 3⁄43⁄4- ^f"?" The ffi is transmitted to the saw blade, and the speed ratio of the motor to the saw blade is between 30:1 and 60:1.

 The motor has a no-load speed between 12,000 rpm and 36000 rpm. The saw blade has a no-load speed between 200 rpm and 600 rpm.

 Preferably, the speed ratio of the motor to the saw blade is between 45:1 and 55:1.

 Preferably, the motor is a direct current motor. The saw blade has a no-load speed between 200 rpm and 450 rpm. The hand-held cutter further includes a battery pack that energizes the rotation of the motor, the battery pack being disposed on the operating rod opposite the other end of the working assembly.

 Preferably, the motor is an alternating current motor. The saw blade has a no-load speed between 300 rpm and 600 rpm. The hand-held cutter sets a power connection cable.

 The saw blade includes a circular base body and a plurality of teeth disposed on the outer edge of the base, and the cutting edges of the teeth are disposed along the same side of the circumferential direction of the saw blade. The shape of the cutter is a trapezoid with a narrow upper and a lower width. The first saw blade and the second saw blade of the saw blade are each provided with a plurality of openings, and the size and position of the openings respectively correspond.

 The transmission mechanism includes a first drive train that drives rotation of the second saw blade and a second drive train that drives rotation of the second saw blade, the rotational speed of the first saw blade being different from the rotational speed of the second saw blade.

 The transmission mechanism includes a first reduction gear and a second reduction gear. The first reduction gear is a planetary gear train, and the planetary gear train includes at least a first planetary gear set of the motor pinion. The first planetary gear set includes a first center wheel, a plurality of first planet wheels meshing with the first center wheel, a first planet carrier supporting the first planet gear, and a first outer periphery of the first planet carrier a internal spur, the first planetary gear meshes with internal teeth of the first internal spur, the motor pinion serves as a first central wheel, and the rotation of the motor pinion is transmitted to the first planet through the first planetary gear The first output shaft of the rack.

 The first bevel gear train includes a second bevel gear that meshes with the first bevel gear, the second bevel gear train includes the first bevel gear, and a third bevel gear that meshes with the first bevel gear, The second and third bevel gears are coaxially arranged. The second bevel gear is fixedly coupled to the motor output shaft, and the third bevel gear is sleeved on the motor output shaft and is matched with the motor output shaft.

 The second reduction gear includes a cylindrical gear train that is coupled to the first reduction gear and that drives the rotation of the first and second saw blades. The spur gear train includes a first spur gear train for driving a first saw blade rotation and a second spur gear train for driving a second saw blade reverse Rotate.

 The operating lever includes an upper connecting rod and a lower connecting rod. The upper connecting rod is slidably adjustable along the longitudinal direction thereof, and the relative position of the upper connecting rod and the lower connecting rod is locked by the locking member.

Preferably, the axis of the motor coincides with the extending direction of the operating rod and fits the plane with the saw blade 王?Λ in SL JL.

 Preferably, the axis of the motor is perpendicular to the plane of the saw blade attachment.

 The invention has the advantages of high cutting efficiency, safe operation, light weight, low noise and low vibration.

 Another technical solution of the present invention is achieved by: a hand-held cutting tool comprising an operating rod, a motor disposed on the operating rod, a working assembly coupled to the output shaft of the motor, and a transmission mechanism disposed between the motor and the working assembly Wherein the motor is disposed adjacent to the working component, the working component includes a pair of saw blades disposed coaxially and rotating in opposite directions, the transmission mechanism includes a first reduction device, and the first reduction device is a planetary gear train. The planetary gear train includes at least a first planetary gear set of a motor pinion.

 The first planetary gear set includes a first center wheel, a plurality of first planet wheels meshing with the first center wheel, a first planet carrier supporting the first planet gear, and a first outer periphery of the first planet carrier a internal spur, the first planetary gear meshes with internal teeth of the first internal spur, the motor pinion serves as a first central wheel, and the rotation of the motor pinion is transmitted to the first planet through the first planetary gear The first output shaft of the rack.

 The first reduction gear unit further includes a second planetary gear set, a third planetary gear set, the second planetary gear set including a plurality of second planetary gears, and a second carrier supporting the second planetary gears a second internal spur disposed at a periphery of the second planet carrier, the second planetary gear meshing with a second center wheel fixed to the first output shaft, and meshing with the internal teeth of the second internal spur The rotation of the second center wheel is transmitted to the second output shaft of the second planet carrier through the second planet carrier, the third planet gear set includes a plurality of third planet gears, and the third planet supporting the third planet gear a planet carrier, a third internal gear disposed at a periphery of the third planet carrier, the third planet gear meshing with a third center wheel fixed to the second output shaft, and meshing with the internal teeth of the third internal gear The rotation of the third center wheel is transmitted to the third output shaft of the third planet carrier through the third planet carrier.

 The transmission mechanism further includes a second reduction device including a bevel gear train mated with the first reduction device for driving the rotation of the upper and lower blades. The bevel gear train includes a first bevel gear train for driving a lower saw blade rotation and a second bevel gear train for driving a reverse rotation of the upper saw blade.

 The first bevel gear train includes a second bevel gear that meshes with the first bevel gear, the second bevel gear train includes the first bevel gear, and a third bevel gear that meshes with the first bevel gear, The second and third bevel gears are coaxially arranged. The second bevel gear is fixedly coupled to the motor output shaft, and the third bevel gear is sleeved on the motor output shaft and is matched with the motor output shaft.

The third bevel gear is arranged as a spiral tooth. The motor output shaft axis is disposed obliquely with respect to the motor axis. The motor output shaft is screwed to a lock nut, and the upper and lower saw blades pass through the lock nut Λ_ Ί 3⁄4J Λ'^ m<) ms >.

 In another embodiment, the transmission mechanism further includes a second reduction gear, and the second reduction gear includes a cylindrical gear train coupled to the first reduction gear and configured to drive the rotation of the upper and lower blades. The spur gear train includes a first spur gear train for driving a lower spur gear train and a second spur gear train for driving a reverse rotation of the upper saw blade.

 The first spur gear train includes a first spur gear coupled to the first reduction gear, a second spur gear meshing with the first spur gear, and a third spur gear meshing with the second spur gear, the second The spur gear train includes the first spur gear, the second spur gear, the fourth spur gear, a fifth spur gear meshing with the fourth spur gear, and a sixth spur gear meshing with the fifth spur gear, the first The spur gear is fixedly coupled to the first transmission shaft, the second and fourth spur gears are fixedly coupled to the second intermediate shaft, and the fifth spur gear is fixedly coupled to the third intermediate shaft, the third cylinder The gear is fixedly coupled to the fourth output shaft, the sixth spur gear is movably coupled to the fourth output shaft, and the first transmission shaft, the second intermediate shaft, the third intermediate shaft, and the fourth output shaft are respectively wound Its axis rotates and the axes are parallel to each other.

 The fourth output shaft is a motor output shaft. The first, second, third, fourth, fifth, and sixth spur gears are disposed as spur gears. The axis of the motor is perpendicular to the conforming plane of the upper and lower saw blades.

 The sixth spur gear is provided with an upper blade adapter for driving the rotation of the upper saw blade, and a compression nut is arranged below the upper saw blade. The fourth output shaft is threadedly coupled to a lock nut, and the upper and lower saw blades are locked to the fourth output shaft end by the lock nut.

 The hand-held cutting tool of the present invention is more convenient and lighter in operation because of the small size and light weight of the transmission mechanism.

DRAWINGS

 The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

 1 is a perspective view of a hand-held cutting machine in accordance with an embodiment of the present invention.

 2 is a partially enlarged cross-sectional view showing the hand-held cutter of the embodiment of the present invention. Figure 3 is an exploded perspective view of the first reduction gear of Figure 2;

 4 is a top plan view of a saw blade on a hand-held cutting machine in accordance with an embodiment of the present invention.

 Figure 5 is a top plan view of the saw blade under the hand-held cutter of the present invention.

 Figure 6 is a perspective view of another embodiment of the present invention.

 Figure 7 is an enlarged partial cross-sectional view of the hand-held cutter of Figure 6.

 Figure 8 is a perspective view of the gear transmission mechanism of Figure 7.

Figure 9 is a cross-sectional view of the lower saw blade transmission structure taken along line AA of Figure 7. T3⁄4 丄υ疋t3⁄4 / o~o Force i port J tr, j丄' n Ί 3⁄4 AH.

among them:

 1-Electric Double Saw Blade Cutting Machine 17-Drive Shaft 43-Upper Saw Blade Adapter

 2-Upper blade 18, 18' - Transmission mechanism 44-Pressure nut

 2a-upper tooth 19-auxiliary handle 45-lower blade adapter

 2b-lower blade 20, 20 ' -operating rod 46-lock nut

 3-working component 21-first bevel gear 51-first transmission shaft

 4-low saw blade 22-second bevel gear 52-second drive shaft

 4a-lower teeth 23-third bevel gear 53-third drive shaft

 4b-lower blade 23a - bottom 53a - first end

 5-center 孑 L 24-Adapter 53b - second end

 6, 6, -Motor 25-Lock nut 70-Planetary gear set

 6a, 6a' - pinion 26 - support frame 71 - first planet carrier

 7, 7' - first reduction gear 27 - drive shaft 71a, 72a, 73a - planetary gear

7a, 7a' - gearbox housing 27a - first end 71b, 72b - center wheel

8 ^_ flat square 孑ϋ 27b - second end 72 - second planet carrier

 8a-first opening 28-shield 73-third planet carrier

 8b - second opening 29, 29 ' - second reduction gear 74 - first gear

 9-connection hole 30-power connection cable 74a, 75a, 76a - internal tooth

 10-electric double saw blade cutting machine 31-first gear 75-second gear

 11-low connecting rod 32-second gear 76-third tooth

 12-up connecting rod 33-third gear 80- mating hole

 13-locking element 34-fourth gear R, R' - direction of rotation

 14_Battery pack 35-Fifth gear XI, X2-motor axis

 15, 15, -Operation handle 36- Sixth gear Υ, Υ' - Fit plane

 16-control switch 41-output shaft

detailed description

Referring to Figure 1, Figure 1, the present invention relates to an electric double saw blade cutting machine 1 having an operating lever 20 including a lower connecting rod 11 and an upper connecting rod 12, the upper connecting rod 12 being longitudinally opposite the lower connecting rod 11 The slide is adjusted in the long direction and the relative position of the upper connecting rod 12 and the lower connecting rod 11 is locked by a locking element 13. A working assembly 3 is disposed at an end of the lower connecting rod 11 away from the upper connecting rod 11, and the motor 6 is disposed adjacent to the working unit 3. The upper connecting rod 12 is provided with an operating handle 15 disposed on the operating handle 15 The power supply of the power supply, the power supply in this embodiment uses a detachable and rechargeable battery pack 14, a battery pack

14 The lithium battery unit can be used. The total voltage of the battery pack 14 can be set to different voltages such as 18V, 21.6V, 25.2V, 32.4V, 36V. The working assembly 3 includes a pair of disc-shaped metal saw blades which are disposed opposite each other and are rotated in opposite directions, wherein the outer edges of the disc-shaped bases of the upper saw blade 2 and the lower saw blade 4 are respectively provided with a plurality of teeth. A transmission mechanism 18 is provided between the motor 6 and the working assembly 3 in the gear case housing 7a, and the rotation of the motor 6 is transmitted to the upper saw blade 1 and the lower saw blade 4 through the transmission mechanism 18, respectively.

 Referring to Figures 1 and 2, the motor 6 is disposed along the longitudinal extension of the operating rod 20, i.e., the motor axis XI extends along the longitudinal direction of the operating rod 20 and is inclined with respect to the working planes of the upper and lower saw blades 2, 4. The extension line of the motor axis XI in this embodiment has an acute angle of less than 90 degrees with the bonding plane Y of the upper saw blade 2 and the lower saw blade 4. A pinion gear 6a is fixedly coupled to the end of the motor 6, and the pinion gear 6a and the first reduction gear unit 7 provided in the gear case housing 7a transmit the rotational power of the motor 6 to the transmission shaft 17. In the present embodiment, the first reduction gear unit 7 is a planetary gear set. Of course, those skilled in the art can also replace it with a pulley deceleration mechanism or the like.

 Referring to FIG. 3, the planetary gear set 70 includes a first planet carrier 71, a second planet carrier 72, a third planet carrier 73, and a first gum 74, a second gum 75, and a third gum 76; The inner side surfaces of the second gingival 74 and the third gingival 76 are respectively provided with internal teeth 74a, 75a, 76a; the first planetary carrier 71 has a side end surface provided with three planetary gears 71a that mesh with the internal teeth 74a, The other end surface of the second carrier 72 is provided with a center wheel 71b; the second planetary carrier 72 side end surface is provided with five planetary gears 72a engaged with the internal teeth 75a, and the other side end surface of the second planetary carrier 72 is provided with a center wheel 72b; The side end surface of the third carrier 73 is provided with five planetary wheels 73a that mesh with the internal teeth 76a, and the third carrier 73 is provided with a matching hole 80 for fixedly mating with the transmission shaft 17, of course, the transmission shaft 17 and the The three planet carrier 73 can also be integrally formed or otherwise mated. The motor pinion 6a meshes with the planetary gear 71a to drive the first carrier 71 and the center wheel 71b to rotate downward; since the center wheel 71b is meshed with the planetary gear 72a, the second carrier 72 and the center wheel 72b are driven to rotate downward; The wheel 72b is meshed with the planetary gear 73a to drive the third carrier 73 and the transmission shaft 17 to rotate downward. Thus, the high speed of the motor 6 is decelerated by the planetary gear set 70 and reaches the drive shaft 17 which has a relatively low rotational speed.

The gearbox housing 7a further includes a second reduction gear 29, and the second reduction gear 29 includes a first bevel gear 21 fixedly disposed at an end of the transmission shaft 17, and a second bevel gear 22 fixedly coupled to the transmission shaft 27. The third bevel gear 23 is disposed on the transmission shaft 17, the first bevel gear 21 meshes with the second bevel gear 11 and the third bevel gear 23, and the second bevel gear 22 is coaxial with the third bevel gear 23, and the transmission shaft 27 The tilting shaft 17 is disposed obliquely with respect to the drive shaft 17, and the first bevel gear 21 drives the second bevel gear 11 when the propeller shaft 17 rotates. The drive shaft 27 has two ends, wherein the first end portion 27a is supported in the gear case housing 7a, the drive shaft 27 extends vertically downward and an adapter member 24 is disposed at the second end portion 27b. The adapter member 24 is tightly coupled to the drive shaft 27, and may of course be connected by other structures such as splines; the adapter member 24 is coupled to the lower blade 4 such that the drive shaft 27 drives the adapter member 24 When the rotation is started, the adapter 24 drives the lower saw blade 4 to rotate. The third bevel gear 23 in this embodiment is disposed such that the umbrella arc teeth are clearance-fitted with the transmission shaft 27, so that the third bevel gear 231 is independently rotated by the driving of the first bevel gear 21, and the bottom portion 23a of the third bevel gear 23 and the upper saw The sheet 1 is mated such that the third bevel gear 23 drives the upper saw blade 2 to rotate under the driving of the first bevel gear 21, and the direction of rotation of the upper saw blade 2 is opposite to the direction of rotation of the lower saw blade 4.

 The gear housing 7a is connected to a shroud 28, and the upper saw blade 2 and the lower saw blade are respectively located below the shroud 27. The bottom of the lower saw blade 4 is provided with a support frame 26, which is made of a metal material; A lock nut 25 is attached to the end of the 27, and the rotary lock nut 25 can lock the upper and lower saw blades 2, 4 between the support frame 26 and the shroud 28.

Referring to Figures 4 and 5, the outer edge of the upper blade 1 is provided with a plurality of teeth 2a, the teeth 2a are trapezoidal in a narrow and wide width, and the blade 2b is located in the direction of rotation of the blade 2a along the upper blade 2 -side. The outer edge of the disc of the lower saw blade 4 is also provided with a plurality of teeth 4a having the same or similar shape as the teeth 2a, the cutting edges 4b of which are located on the side of the cutter teeth 42a in the direction of rotation R' of the lower saw blade 4. Thus, when the upper saw blade 2 and the lower saw blade 4 are rotated in opposite directions, the blade edge 2b of the upper saw blade 1 and the blade edge 4b of the lower saw blade 4 will be in direct contact at a certain position, so that between the blade edge 2b and the blade edge 4b Form a scissor cutting action. The upper saw blade 2 and the lower saw blade 4 are arcuately distributed with a plurality of openings 8a and openings 8b at the center of the saw blade. The aperture of the opening 8a is slightly larger, the aperture of the opening 8b is slightly smaller, and the saw is sawed. The openings 8a, 8b of the sheet 2 are respectively disposed corresponding to the positions of the openings 8a, 8b of the lower saw blade 4, and the openings 8a and 8b in the present example are respectively disposed on different concentric circular lines, and are opened. In the case of a circular hole, it is conceivable by those skilled in the art that the opening 8a is spaced apart from the opening 8b and distributed in a circular arc shape, or otherwise arranged, and the opening may be provided in a square hole or other shape. The arrangement of the openings 8a, 8b reduces the weight of the saw blade without reducing the strength of the saw blade; since the double saw blade cutter 1 uses the energy of the battery pack 14 as a driving force, the weight of the saw blade can be reduced. Conducive to the reduction of battery energy consumption, improve the working time of a single charge. In addition, when the saw blade is removed or replaced, since the lock nut 25 needs to be unscrewed from the drive shaft 27 first, in order to prevent the drive shaft 27 from following, the drive shaft 27 needs to be locked. The opening 8a or the opening 8b of the upper and lower saw blades 2, 4 facilitates the locking of the drive shaft 27 as long as the operator inserts the universal wrench or other tool into the opening of the upper saw blade 1 and the lower saw blade 4 with one hand. Limit upper and lower saw blades in hole 8a or opening 8b Remove the lock nut 25

 The upper saw blade 2 is provided with a central hole 5 for providing a transmission shaft 27, and a plurality of small circular holes 9 distributed along the circular arc shape are disposed at the periphery of the central hole 5, and the circular arc shape is concentrically arranged with the central hole 5. The small circular hole 9 is for mating with a bottom projection (not shown) of the third bevel gear 35, so that the third bevel gear 35 drives the upper saw blade 2 to rotate. The central portion of the lower saw blade 4 is provided with a flat square hole 8, and the flat square hole 8 is shaped in cooperation with the adapter sleeve 24 to drive the lower saw blade 4 to rotate when the drive shaft 27 drives the adapter sleeve 24 to rotate.

 The edge of the lower saw blade 4 is inclined toward the saw blade 2, and a gap is provided between the upper saw blade 2 and the disk surface of the lower saw blade 4, and only the portions adjacent to the teeth 2a, 4a are fitted to each other, so that the upper saw blade 2 The wear of the lower saw blade 4 during the rotation is relatively small, and it is advantageous for the upper blade 2b and the lower blade 4b to be cut together.

 When the idle speed of the output of the motor 6 is set to 20400 rpm, the reduction ratio after the first deceleration by the first reduction device 7 reaches 16.875; when the transmission shaft 17 rotates through the first gear 31, the second gear 32, and the The third gear 33 performs the second deceleration, and the reduction ratio reaches 2, 95, and the total reduction ratio of the motor 6 to the lower saw blade 4 reaches 49.78125. When the drive shaft 17 rotates through the first gear 31, the second gear 32, the fourth gear 34, the fifth gear 35, and the sixth gear 36 in sequence for a second deceleration, the reduction ratio reaches 3, then the motor 6 to the upper saw blade The total reduction ratio of 1 reaches 50.625. Setting the no-load current of the cutting machine 1 to 8A, according to the characteristic curve of the motor 6, when the voltage is 21.6V, the load speed of the cutting machine is 18600 rpm, and the rotation speed of the upper saw blade 2 during load is 368 rpm; The lower saw blade 4 rotates at 374 rpm. The detailed calculation process and data are shown in Table 1:

 Table 1

It can be seen from the data in Table 1 that the high speed of the motor 6 is reduced by the transmission mechanism 18, so that the rotation speeds of the upper and lower saw blades 2, 4 are lowered; such a low rotation speed causes the upper and lower saw blades 2, 4 to rotate relatively. During the process, a scissor cut is formed between the cutter teeth 2a, 4a, which is safer for mowing or trimming the branches; the current DC motor capable of meeting the above high speed can be made smaller and lighter, and the diameter is about For The cutting machine is light in weight and lighter in operation. Moreover, since the transmission mechanism different from the engine cutter is used, the noise and vibration mainly generated by the transmission mechanism 18 during operation are greatly reduced. Of course, it is more environmentally friendly to use the DC or AC power source as the power source than the engine. . In particular, when the battery pack 14 is used as the power supply source, the longer the working time of the battery pack 14 for a single charge, the lower the power loss rate and the better the tool performance. For the DC motor, the high speed range of the output during operation is preferentially between 12000 rpm and 25000 rpm. After the high speed is decelerated by the transmission mechanism 18, the upper and lower saw blades 2, 4 respectively output low speeds, which are respectively low speeds. Can be set to 200rpm, 25 Or pm, 3 OOr pm, 35 Or pm, 4 OOr pm, 45 Or pm. If the no-load power and load power are lower, the working efficiency of the electric double saw blade cutter 1 is higher. It is very important to set the appropriate reduction gear and its reduction ratio. After experimental tests, the speed ratio between the motor 6 of the double saw blade cutter 1 and the upper and lower saw blades 2, 4 can be set to the following values 30: 1, 35: 1, 40: 1, 45: 1, 50: 1, 55: 1 Refer to Table 2, which is the comparison of the experimental data of the cutting machine 1 and the ordinary lawnmower. The working component of the cutting machine 1 utilizes a metal double saw blade, which is used by the workpiece component of the ordinary grass cutter. It is a cutting line. The voltage applied to the cutting machine 1 is 18V, the no-load current is 8A, the saw blade output low speed is 400rpm, and the no-load power is 144W. When used for mowing operation, the working current is between 9A and 12A. The output load power is only between 162W and 246W; when the cutting machine 1 is used to cut branches, its working current is 13.5A, and the output load power is only 243W. The normal working speed of the lawnmower is 28.8V, the no-load current is 6.5A, the output speed is 8000rpm, the output no-load power is 187.2; the working current is 9-11A, and the output load power is 259.2-316.8. When the no-load speed of the ordinary lawnmower is adjusted to 8500 rpm, the no-load current is 8A, the output no-load power is 230W, the working current is between 9.5A and 13.5A, and the output function is 273.6W to 388.8W. between.

 Table 1

It can be seen from the data in Table 2 that the no-load power of the cutting machine 1 is lower than that of the ordinary lawn mower, and the load power is higher than that of the lawn mower regardless of whether the cutting machine 1 is in the working state of mowing or cutting branches. The load power is low. That is to say, when the battery pack is used as the working power source, the cutting work by the cutter 1 is lower than the power loss of the conventional grass cutter performing the cutting work. The descriptions are not repeated and are denoted by the same reference numerals, and different structures are denoted by different reference numerals. The driving power of the motor 6' is powered by an alternating current power source, and the external power source is connected through the power connection line 30 at the end of the operating lever 20'; the operating lever 20' is provided with an operating handle 15' and an auxiliary handle 19 for adjusting the operating angle, and the operating handle 15 And the auxiliary handle 19 is respectively provided with a control switch (not shown); the motor 6' is disposed at an angle with the operating rod 20', and the rotational power of the motor 6' is passed through the transmission mechanism 18' provided to the gear case housing 7a' Transfer to the upper saw blade 2 and the lower saw blade 4. The motor 6' in this embodiment is an AC motor, and has a similarly small and lightweight feature to the motor 6 in the first embodiment.

 Referring to Figures 7 and 8, the motor 6' is arranged in a vertical direction, and the motor axis X2 is substantially perpendicular to the bonding plane Y' of the upper blade 2 and the lower blade 4. The end of the motor 6' is provided with a pinion 6a', and the rotational power of the motor 6' is transmitted to the output shaft 41 through the meshing transmission of the pinion 6a' and the first reduction gear V provided in the gear case housing 7a; A reduction gear 7' can be replaced with a pulley reduction mechanism or the like in a similar configuration to the planetary gear set 70 of the first embodiment. The second reduction gear 29' includes a first gear 31 fixedly coupled to the end of the output shaft 41, a second gear 32 and a fourth gear 34 fixedly coupled to the first transmission shaft 51, and fixedly coupled to the second transmission shaft The fifth gear 35 of 52 is respectively disposed on the third gear 33 and the sixth gear 36 of the third transmission shaft 53, wherein the third gear 33 is fixedly coupled with the third transmission shaft 53, and the sixth gear 36 and the third transmission The shaft 53 is rotatably connected; wherein the first gear 31 meshes with the second gear 32, and when the first gear 32 drives the second gear 32 to rotate, the first transmission shaft 51 is rotated, so that the first gear 32 is coaxially disposed. The fourth gear 34 rotates at the same speed; since the second gear 32 meshes with the third gear 33 disposed on the third transmission shaft 53, when the second gear 32 rotates, it drives the third gear 33 and the third transmission shaft 53 at the same speed Rotation; the fourth gear 34 meshes with the fifth gear 35, and the fifth gear 35 meshes with the sixth gear 36 at the same time, so when the fourth gear 34 rotates at the same speed as the second gear 32, the fourth gear 34 drives the fifth Gear 35 rotates, fifth tooth The sixth gear 35 drives the wheel 36 to rotate. The first, second, third, fourth, fourth, fifth, and sixth gears in the embodiment respectively use a spur gear, the output shaft 41 and the first transmission shaft 51, and the second transmission shaft 52, The third drive shafts 53 are respectively parallel.

 The sixth gear 36 has a lower end fixedly coupled to an upper blade adapter 43 , and the upper blade adapter 43 is detachably coupled to the upper blade 2 , and the upper blade adapter 43 is coupled to the upper blade 2 . The sixth gear 36 drives the upper saw blade 2 to rotate by the upper saw blade adapter 43. In addition, a lowering nut 44 for supporting the upper saw blade 2 is disposed below the upper saw blade 1, and the lower saw blade 4 is disposed below the lower saw blade 4. The compression nut 46 supporting the lower blade 4 is screwed to the third transmission shaft 53.

The third transmission shaft 53 has two end portions, and the first end portion 53a is supported in the gear case housing 7a'. The piece 45 and the pressing nut 46 are sequentially disposed on the second end 53b, and the lower blade adapter 45 is fixedly coupled with the second end 53b, and the lower blade adapter 45 is matched with the central opening of the lower saw blade 4 .

 Referring further to FIGS. 9 and 10, when the motor 6' rotates, the first gear 31 of the output shaft 41 drives the second gear 32 on the first transmission shaft 51 to rotate, and the second gear 32 drives the third gear 33 to rotate. The third gear 33 drives the third transmission shaft 53 to rotate at the same speed, and the third transmission shaft 53 drives the lower saw blade 4 to rotate by the lower blade adapter 45. The first transmission shaft 51 rotates to drive the fourth gear 34 to rotate, the fourth gear 34 drives the fifth gear 35 to rotate, the fifth gear 35 drives the sixth gear 36 to rotate, and the sixth gear 36 drives the upper saw blade 2 to rotate, and the upper saw The direction of rotation of the sheet 2 is opposite to the direction of rotation of the lower saw blade 4.

 In the embodiment, the cutting machine 10 uses an AC power source, and the motor 6' preferentially uses a range of speeds of 20,000 rpm to 36,000 rpm, first through the first deceleration of the first reduction device 7', and then through the second reduction device 29' The second deceleration of the first, second and third gears, the lower saw blade 4 outputs a low speed range of approximately 300 rpm to 600 rpm, passing through the second reduction device 29, the first, second, fourth, fifth The second deceleration of the sixth gear causes the upper saw blade 2 to output a low speed range of approximately 300 rpm to 600 rpm. The preferred reduction ratio is 60: 1, 55: 1, 50: 1, 45: 1, 40: 1. The transmission mechanism 18' is arranged such that the no-load power and the load power are reduced to the most reasonable level, which is advantageous for saving power, and the vibration of the noise generated by the cutter 10 during operation is relatively small.

Claims

1. A hand-held cutting machine comprising: Operating lever a working component disposed at one end of the operating rod; a motor that drives the working component, the motor being disposed adjacent to the working component; a transmission mechanism disposed between the motor and the working component; The working component comprises: a pair of blades arranged coaxially and rotating in opposite directions, wherein the motor transmits the rotation output to the saw blade through a transmission mechanism, and the speed ratio of the motor to the saw blade is 30:1. Between 60:1.  2. The hand-held cutting machine according to claim 1, wherein: the speed ratio of the motor to the saw blade is between 45:1 and 55:1.  3. The hand-held cutting machine according to claim 1, wherein: the idle speed of the motor is between 12,000 rpm and 36000 rpm.  4. The hand-held cutter according to claim 1, wherein: the saw blade has a no-load rotational speed of between 200 rpm and 600 rpm.  5. A hand-held cutting machine according to claim 3 wherein the motor is a direct current motor. 6. Hand-held cutting machine according to claim 3, characterized in that the electric machine is an alternating current machine. 7. The hand-held cutter according to claim 5, wherein: the saw blade has an idle speed between 200 rpm and 450 rpm.  8. The hand-held cutter according to claim 6, wherein: the saw blade has a no-load rotational speed of between 300 rpm and 600 rpm.  9. The hand-held cutting machine according to claim 1, wherein: the saw blade comprises a circular base body and a plurality of teeth disposed on an outer edge of the base, the cutting edge of the tooth along the saw blade The circumferential direction is set on the same side. 10. The hand-held cutting machine according to claim 9, wherein: the shape of the teeth is a trapezoid having a narrow width and a width.  The hand-held cutting machine according to claim 9, wherein: the first saw blade and the second saw blade of the saw blade are each provided with a plurality of openings, and the size and position of the openings respectively correspond.  12. The hand-held cutting machine according to claim 1 or 5, wherein: the hand-held cutting machine further comprises a battery pack for providing energy for rotating the motor, the battery pack being disposed on the operating rod relative to the working component another side. The hand-held cutting machine according to claim 1 or 6, wherein: the hand-held cutting Λ'^ τ- JL 3⁄4j v,  1 . The hand-held cutting machine according to claim 1 , wherein: the transmission mechanism includes a first transmission system that drives rotation of the first saw blade and a second transmission system that drives rotation of the second saw blade, The rotational speed of the first saw blade is different from the rotational speed of the second saw blade.  1 . The hand-held cutting machine according to claim 1 , wherein: the operating rod comprises an upper connecting rod and a lower connecting rod, wherein the upper connecting rod is slidably adjustable along the longitudinal direction thereof and passes through The locking element locks the relative position of the upper connecting rod and the lower connecting rod.  The hand-held cutting machine according to claim 1, wherein the axis of the motor coincides with the extending direction of the operating rod and is disposed at an acute angle to the plane of the saw blade.  The hand-held cutter according to claim 1, wherein the axis of the motor is perpendicular to a plane in which the saw blade fits.  1 8. A hand-held cutting machine, including: Operating lever a motor disposed on the operating lever; a working component connected to the output shaft of the motor; a transmission mechanism disposed between the motor and the working component, wherein the motor is disposed adjacent to the working component; wherein the working component includes a pair of saw blades disposed coaxially and rotating in opposite directions, the transmission mechanism including the first The speed reduction device, the first speed reduction device is a planetary gear train, and the planetary gear train includes at least a first planetary gear set of the motor pinion.  The hand-held cutter according to claim 18, wherein: the first planetary gear set includes a first center wheel, and a plurality of first planet wheels meshing with the first center wheel, a support base a first planet carrier of the first planet gear, a first inner ring disposed at a periphery of the first planet carrier, the first planet gear meshing with internal teeth of the first inner tooth, the motor pinion serving as the first The center wheel, the rotation of the motor pinion is transmitted to the first output shaft of the first planet carrier through the first planet gear. The hand-held cutting machine according to claim 19, wherein: the first reduction gear device further comprises a second planetary gear set, a third planetary gear set, and the second planetary gear set a plurality of second planet gears, a second planet carrier supporting the second planet gears, a second internal gear set disposed at a periphery of the second planet carrier, and the second planet gears fixed to the first output shaft The second center wheel is engaged while meshing with the internal teeth of the second internal gear, and the rotation of the second center wheel is transmitted to the second output shaft of the second carrier through the second carrier, the third planetary gear The gear set includes a plurality of third planet gears, a third planet carrier supporting the third planet gears, a third internal gear set disposed at a periphery of the third planet carrier, and the third planet gears are fixed to the second The third center wheel of the output shaft is meshed while being inside the third internal tooth 3⁄4 *w "ά" , ι 3⁄4L 二τ H', J uji 二^ π 生王二生木ti-j 二m<) K-axis.  2 1 . The hand-held cutting machine according to claim 18, wherein: the transmission mechanism further comprises a second reduction device, the second reduction device comprising a first deceleration device and being used for driving The bevel gear train that rotates the lower blade.  22. The hand-held cutter of claim 3, wherein: the bevel gear train comprises a first bevel gear train and a second bevel gear train, the first bevel gear train for driving a lower saw blade rotation The second bevel gear is used to drive the upper saw blade to rotate in the opposite direction.  2. The hand-held cutter according to claim 22, wherein: the first bevel gear train includes a second bevel gear that meshes with the first bevel gear, and the second bevel gear train includes the first a bevel gear, and a third bevel gear meshing with the first bevel gear, the second and third bevel gears being coaxially disposed.  The hand-held cutting machine according to claim 23, wherein: the second bevel gear is fixedly coupled to the motor output shaft, and the third bevel gear is sleeved on the motor output shaft and Matching with the motor output shaft clearance.  25. The hand-held cutter according to claim 23, wherein: the third bevel gear is provided as a canopy.  26. The hand-held cutter according to claim 18, wherein: the motor output shaft axis is disposed obliquely with respect to the motor axis.  27. The hand-held cutting machine according to claim 18, wherein: the motor output shaft is screwed to a lock nut, and the upper and lower saw blades are locked to the motor output shaft end by the lock nut. unit. 28. The hand-held cutting machine according to claim 18, wherein: the transmission mechanism further comprises a second reduction device, the second reduction device comprising a first deceleration device and for driving The cylindrical gear train with the lower saw blade rotating.  29. The hand-held cutter according to claim 28, wherein: the spur gear train comprises a first spur gear train and a second spur gear train, the first spur gear train is for driving the lower saw blade rotation The second cylindrical gear train is used to drive the upper saw blade to rotate in the reverse direction. 30. The hand-held cutting machine according to claim 29, wherein: the first spur gear train comprises a first spur gear coupled to the first reduction gear, and a second spur gear meshing with the first spur gear And a third spur gear meshing with the second spur gear, the second spur gear train including the first spur gear, the second spur gear, the fourth spur gear, and the fifth spur gear meshing with the fourth spur gear And a sixth spur gear that meshes with the fifth spur gear, the first spur gear is fixedly coupled to the first transmission shaft, and the second and fourth spur gears are fixedly coupled to the second intermediate shaft, j 罔4土 if'tr Λ _ 仗 2 ¹ T | tg ^fB , 罔 罔 土 ΰ υ υ ⁄ ⁄ ⁄ 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出 输出The first transmission shaft, the second intermediate shaft, the third intermediate shaft, and the fourth output shaft respectively rotate about their axes, and the axes are parallel to each other.  31. The hand-held cutter of claim 30, wherein: said fourth output shaft is a motor output shaft.  The hand-held cutter according to claim 30, wherein: said first, second, third, fourth, fifth, and sixth spur gears are provided as spur gears.  33. The hand-held cutter according to claim 18 or 31, wherein: the axis of the motor is perpendicular to a conforming plane of the upper and lower saw blades.  The hand-held cutting machine according to claim 30, wherein: the sixth spur gear is provided with an upper blade adapter for driving the rotation of the upper blade, and the lower blade is provided below Press the nut. 35. The hand-held cutting machine according to claim 30, wherein: the fourth output shaft is screwed to a lock nut, and the upper and lower saw blades are locked to the fourth output shaft by the lock nut Ends.