KR20040050701A - Engine starter - Google Patents

Abstract

An object of the present invention is to obtain an engine starter which can achieve a long service life and can reduce noise.

The tip portion 7 of the rotatable motor shaft 2 has an outer portion 14 arranged around the motor shaft 2, and an output shaft 8 coaxial with the motor shaft 2 is rotatably mounted. have. The output shaft 8 is always connected to the engine. The inner shaft 16 which is integrally rotated with the motor shaft 2 is attached to the motor shaft 2. Between the inner part 16 and the outer part 14, the sprag 22 which transmits rotation of the inner part 16 to the outer part 14 is arrange | positioned. In addition, the shaft of the motor shaft 2 is supported by the motor shaft bracket 5 so that rotation is free. The output shaft bracket 10 is fitted to the motor shaft bracket 5 so that the shaft is supported coaxially with the motor shaft 2.

Description

Engine starter {ENGINE STARTER}

Background of the Invention

Field of invention

The present invention relates to an engine starting device for starting an engine, for example, an automobile.

Conventional technology

In the conventional engine starter, rotation of the motor shaft is transmitted to the clutch via the planetary reducer. The rotary shaft of the planetary gearhead is disposed around the motor shaft. The clutch is attached to the rotary shaft of the planetary reducer so that the output shaft of the clutch is coaxial with the motor shaft. (See Patent Document 1, for example.)

[Patent Document 1]

Japanese Patent Application Laid-Open No. 2001-99197

In the conventional engine starter as described above, since the output shaft of the clutch is attached to the rotation shaft of the reducer disposed around the motor shaft, it is easy to be eccentric with respect to the motor shaft. This eccentricity may shorten the life of the clutch.

In addition, there is a fear that the sound of gears in the gearhead becomes noise.

Then, this invention makes it a subject to solve the above-mentioned problems, and an object of this invention is to obtain the engine starter which can aim at long life and can reduce a noise.

1 is a longitudinal sectional view showing an engine starting apparatus according to a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view showing the engine starting device according to the second embodiment of the present invention.

♠ Explanation of Codes ♠

1: motor

2: motor shaft

3: armature

5: motor shaft bracket

7: tip end

8: output shaft

10: output shaft bracket

14: outer part

15: recess

16: inner part

22: sprag (delivery body)

23: clutch part

30: armature iron core

31: armature coil

32: coil end

33: Neodymium Ferrite Magnet

41, 42, 43: seal member

45: oil supply passage

An engine starting apparatus according to the present invention has a motor main body, a motor having a rotatable motor shaft extending from the motor main body, and an outer portion arranged around the motor shaft, and is freely rotatably mounted coaxially with the motor shaft at the tip of the motor shaft. And an output shaft for transmitting the rotation of the motor shaft to the engine, and a clutch portion disposed between the motor shaft and the outer portion and transmitting the rotation of the motor shaft to the output shaft at the same rotational speed.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

First embodiment

1 is a longitudinal sectional view showing an engine starting apparatus according to a first embodiment of the present invention. In the figure, the motor 1 has a motor main body 28 and a rotatable motor shaft 2 extending from the motor main body 28. The motor main body 28 has an armature 3 which rotates integrally with the motor shaft 2 and a stator 4 surrounding the armature 3 with a gap therebetween. The shaft of the motor shaft 2 is supported by the motor shaft bracket 5 via the bearing 6 so that rotation is freely possible. The motor shaft bracket 5 is attached to the stator 4.

The motor shaft 2 is also rotatably supported by the rear bracket 29 disposed on the anti-motor shaft bracket 5 side of the motor 1.

The armature 3 has an armature core 30 fixed coaxially to the motor shaft 2 and an armature coil 31 disposed at an outer circumference of the armature core 30. The armature coil 31 has a coil end 32 extending in the axial direction of the motor shaft 2. Here, the outer diameter of the armature core 30 is about 60 mm.

The stator 4 has a neodymium ferrite magnet 33 having a field pole of six poles. The neodymium ferrite magnet 33 is arranged such that the six-pole magnetic field magnetic pole is evenly disposed around the armature 3.

The output shaft 8 is rotatably mounted to the tip portion 7 of the motor shaft 2 via the bearing 9. The output shaft 8 is arranged coaxially with the motor shaft 2. The output shaft bracket 10 is fitted to the motor shaft bracket 5. The output shaft 8 is supported by the output shaft bracket 10 via the bearing 11, and the shaft is supported freely. That is, the shaft of the output shaft 8 is supported by the front-end | tip part 7 of the motor shaft 2, and the output shaft bracket 10 to be freely rotated coaxially with the motor shaft 2.

The output shaft 8 includes a shaft portion 12 to which the bearing 11 is attached, a directing portion 13 extending in a direction perpendicular to the axis around the motor shaft 2 side of the shaft portion 12, and a lead portion. It has the outer part 14 formed in the periphery of 13, arrange | positioned around the motor shaft 2, and the recessed part 15 in which the front-end | tip part 7 of the motor shaft 2 is inserted. The shaft portion 12, the extension portion 13, the outer portion 14, and the recessed portion 15 are arranged coaxially with the motor shaft 2.

The inner part 16 which rotates integrally with the motor shaft 2 is attached to the part between the bearing 6 and the bearing 9 of the motor shaft 2. In the center of the inner portion 16, a through hole 17 through which the motor shaft 2 is mounted is formed. On the surface where the inner part 16 of the motor shaft 2 is attached, the spline part 18 which extends along the axis line of the motor shaft 2, and the bearing 6 side of the spline part 18 around an axis line A stepped portion 19 extending along is formed. The spline part 20 and the step part 21 are formed also in the inner surface of the through-hole 17 corresponding to the spline part 18 and the step part 19 of the motor shaft 2. That is, the stepped portions 19 and 21 and the spline portions 18 and 20 are formed on the mating surfaces of the inner portion 16 and the motor shaft 2.

The inner part 16 is positioned with respect to the axial direction and the direction perpendicular | vertical to an axial line by the fitting of the step | step parts 19 and 21 with respect to the motor shaft 2, and the fitting of the spline parts 18 and 20 is carried out. It is positioned with respect to the circumferential direction by fitting. That is, positioning of the inner portion 16 with respect to the motor shaft 2 is made by fitting the stepped portions 19 and 21 and fitting the spline portions 18 and 20.

Between the inner part 16 and the outer part 14, the some sprag 22 which is a transmission body which transmits rotation of the inner part 16 to the outer part 14 is arrange | positioned. Each sprag 22 is arrange | positioned so that rotation is possible. That is, each sprag 22 is opened from the inner portion 16 in contact with the lock position supported by the inner portion 16 and the outer portion 14 and the outer portion 14. It is possible to reciprocate the displacement between the opening position. In addition, a spring (not shown) is disposed between the sprags 22 and the outer portion 14 to force the respective sprags 22 to the lock position. In addition, the position of the center of each sprag 22 is biased toward the opening position side. Therefore, when the rotation speed of the outer part 14 becomes larger than the rotation speed of the inner part 16, each sprag 22 is displaced minutely from the lock position toward the opening position, and the outer part 14 from the inner part 16 is rotated. When the rotational power of the furnace is lost, and the rotation speed of the output shaft 8 becomes a predetermined speed or more, each sprag 22 is displaced to the open position against the spring force by the centrifugal force. Here, the predetermined rotational speed is set slightly lower than the rotational speed of the output shaft 8 during idling.

Rotation of the inner portion 16 is transmitted to the outer portion 14 when the respective sprags 22 are in the locked position, and not transmitted to the outer portion 14 when the respective sprags 22 are in the open position. Do not. When each sprag 22 is in the locked position, the output shaft 8 is rotated at the same rotational speed as the motor shaft 2.

In addition, the clutch part 23 (one-way clutch) has the inner part 16 and the sprag 22. As shown in FIG. As described above, the clutch portion 23 has a disengagement system in which the sprags 22 are opened from the inner portion 16. The clutch portion 23 and the outer portion 14 are enclosed and protected by the motor shaft bracket 5 and the output shaft bracket 10.

The pulley 25 is fixed to the tip end portion 24 of the shaft portion 12 of the output shaft 8 by a nut 26. A crank pulley (not shown) is fixed to a crank shaft (not shown) of the engine. A transmission belt (not shown) is wound between the pulley 25 and the crank pulley. Rotation of the output shaft 8 is transmitted to the crankshaft through the transmission belt and the crank pulley. The pulley 25 and the crank pulley are always connected by the transfer belt.

Next, the operation will be described.

First, the inner part 16 rotates integrally with the motor shaft 2 by the energization to the motor 1. At this time, the sprag 22 is in the locked position by the force of the spring, and the outer portion 14 is locked with respect to the inner portion 16. Thereby, the rotational power of the inner part 16 is transmitted to the output shaft 8, and the crankshaft of an engine rotates.

When the engine is started by the rotation of the crankshaft, the rotation speed of the crankshaft and the output shaft 8 increases by the drive of the engine. And when the rotation speed of the outer part 14 becomes larger than the rotation speed of the inner part 16, and reaches predetermined | prescribed rotation speed, each sprag 22 will be displaced to an opening position by centrifugal force. As a result, the locked state between the inner portion 16 and the outer portion 14 is released, and the inner portion 16 is in an idle state. That is, the rotational power from the motor 1 is not transmitted to the output shaft 8. After that, energization of the motor 1 is stopped and the engine is in an idling state.

In the engine starting apparatus as described above, since the output shaft 8 is mounted coaxially with the motor shaft 2 on the tip portion 7 of the motor shaft 2, the output shaft 8 is connected to the motor shaft 2. It becomes difficult to be eccentric. Therefore, for example, the inner part 16 and the sprag 22 contact each other without bias, and the life of the clutch 23 can be extended.

Moreover, since the clutch part 23 is directly attached to the motor shaft 2, the gear sound of the conventional speed reducer disappears and noise can be suppressed. In addition, since the reduction ratio of the rotational speed of the motor shaft is small, the engine can be started without increasing the fuel at a high cranking rotational speed, thereby improving fuel economy.

In addition, since the rotation of the output shaft 8 is always transmitted to the engine, there is no need to move the output shaft 8 for connection to the engine at engine start-up. For this reason, the motor 1 can be driven irrespective of the timing between the rotation of the motor shaft 2 and the movement of the output shaft 8. Therefore, the switch for driving the motor 1 can be arranged to be separated from the motor 1, so that the space around the motor 1 can be reduced.

Further, the spline portion 18 and the stepped portion 19 are formed in the through hole 17 of the inner portion 16, and the spline portion 20 and the stepped portion 21 are formed in the motor shaft 2. Since the spline portions 18 and 20 and the step portions 19 and 21 are fitted to each other, the inner portion 16 can be easily attached to the motor shaft 2.

In addition, since the motor shaft bracket 5 and the output shaft bracket 10 are fitted to each other such that the output shaft 8 is coaxial with the motor shaft 2, the output shaft 8 is the tip end of the motor shaft 2. Not only (7) but also the output shaft bracket 10 is coaxially supported by the motor shaft 2, making it more difficult to be eccentric, and the life of the clutch 23 can be further extended.

In addition, since the tip portion 7 of the motor shaft 2 is inserted into the recessed portion 15 of the output shaft 8, the length in the axial direction of the motor shaft 2 can be shortened.

In addition, when the engine starts and the rotation speed of the outer part 14 becomes more than predetermined rotation speed, since the sprag 22 is opened completely from the inner part 16 by centrifugal force, the soup in an idle state The generation of frictional heat between the lag 22 and the inner portion 16 can be avoided with a simple configuration.

In addition, since the rotation speed of the output shaft 8 in which the sprag 22 opens from the inner part 16 is set slightly lower than the rotation speed of the output shaft 8 at the time of idling, the motor shaft ( The rotation of 2) is transmitted to the crankshaft of the engine, and the transmission of the rotation can be canceled during the idling state after starting the engine and during normal operation with a higher rotational speed than during idling. Therefore, the sprag 22 and the inner portion 16 can be prevented from contacting with each other more than necessary, and thus the temperature rise and sintering due to frictional heat can be prevented and the life of the clutch 23 can be extended. We can plan.

In addition, since the motor 1 has a neodymium ferrite magnet 33 having a six-pole field magnetic pole, the rotational torque of the motor shaft 2 can be increased, and the motor 1 is removed from the motor 1 without using a speed reducer. The rotation necessary for starting the engine can be transmitted to the engine, and the motor 1 can be miniaturized.

In addition, although the outer diameter of the armature core 30 of the motor 1 is 60 mm and the field magnetic pole of the neodymium ferrite magnet 33 is 6 poles in the above-mentioned example, it is not limited to this. When the diameter of the crank pulley of the engine is about 110 mm to 150 mm and the diameter of the pulley 25 is about 60 mm to 70 mm, the outer diameter of the armature core 30 is 60 mm to 90 mm, and the neodymium ferrite magnet 33 It is preferable that the field stimulus of) is 6 poles or more.

In the above example, the sprag 22 is opened from the inner portion 16 at a rotational speed slightly lower than the rotational speed of the output shaft 8 during idling, but is higher than the rotational speed required for starting the engine. If it is number, it may open at lower rotation speed.

Second embodiment

2 is a longitudinal sectional view showing the engine starting apparatus according to the second embodiment of the present invention. In the figure, the seal member 41 is formed between the motor shaft 2 and the motor shaft bracket 5, between the output shaft 8 and the output shaft bracket 10, and between the motor shaft bracket 5 and the output shaft bracket 10. 42 and 43 are respectively arranged. The seal member 41 is disposed between the bearing 6 and the inner portion 16. The seal member 42 is disposed between the bearing 11 and the extending portion 13. The seal member 43 is disposed at a portion where the motor shaft bracket 5 and the output shaft bracket 10 around the outer portion 14 are fitted to each other.

Oil accumulates in the space 44 surrounded by the motor shaft bracket 5 and the output shaft bracket 10. The oil has accumulated to the extent that at least part of the outer portion 14 is submerged. The oil does not leak out by the seal members 41, 42, 43. In addition, the motor shaft bracket 5 is provided with an oil supply passage 45 for supplying oil to the space 44.

The bearing 6 is arranged near the armature core 30. That is, the shaft of the motor shaft 2 is rotatably supported by the motor shaft bracket 5 at the inner peripheral side of the coil end 32 of the armature coil 31. Other configurations and operations are the same as in the first embodiment.

In this way, since at least a part of the outer portion 14 is immersed in oil, the oil evenly spreads over the clutch portion 23 and the outer portion 14 by the rotation of the outer portion 14, for example, a clutch. Faults, such as sintering of the part 23, can be prevented, and the life of the clutch 23 can be extended.

In addition, the seal members 41, 42, 43 are provided between the motor shaft 2 and the motor shaft bracket 5, between the output shaft 8 and the output shaft bracket 10, and the motor shaft bracket 5 and the output shaft bracket 10. Since it is arrange | positioned, respectively, it can prevent the leakage of the oil which accumulates in the space 44, and can prevent failure, such as seizure of the clutch 23, without replenishing oil over a long period of time. In addition, since the seal members 41, 42, 43 may be assembled during the assembly of the respective parts such as the motor shaft bracket 5, the inner portion 16, the sprag 22, and the output shaft 8, the seal member ( The assembly of 41, 42, 43 can also be facilitated.

Moreover, since the oil supply path 45 for supplying oil is provided in the motor bracket 5, oil can be easily replenished.

In addition, since the shaft is rotatably supported by the motor shaft bracket 5 on the inner circumferential side of the coil end 32, the motor shaft 2 can further shorten the length in the axial direction of the motor shaft 2. have.

In addition, if the bearings 6 are replaced between the seal member 41 and the inner part 16, that is, the position of the seal member 41 and the bearing 6 is changed, the oil is evenly spread on the bearing 6. Therefore, the life of the bearing 6 can be extended.

In addition, in the above-mentioned example, although the oil supply path 45 is provided in the motor shaft bracket 5, you may be provided in the output shaft bracket 10. FIG.

In addition, in the above-mentioned example, if a part of the outer part 14 is immersed in oil, but it does not interfere with transmission of rotation, even if not only the outer part 14 but a part of the clutch part 23 is immersed in oil, it does not matter. none.

As is evident from the above description, the engine starting device according to the present invention has an outer portion arranged around the motor shaft, the output shaft which is rotatably mounted coaxially with the motor shaft at the tip of the motor shaft and transmits the rotation of the motor shaft to the engine. And a clutch portion disposed between the motor shaft and the outer portion and transmitting the rotation of the motor shaft to the output shaft at the same rotation speed, the output shaft is hardly eccentric with respect to the motor shaft. Therefore, the life of the clutch portion can be extended. Moreover, there is no gear sound of the conventional speed reducer, and noise can be suppressed.

Claims (3)

A motor having a motor body and a rotatable motor shaft extending from the motor body, An output shaft having an outer portion arranged around the motor shaft, the output shaft being rotatably mounted coaxially with the motor shaft to a tip end of the motor shaft, and transmitting rotation of the motor shaft to the engine; And a clutch portion disposed between the motor shaft and the outer portion and configured to transmit rotation of the motor shaft to the output shaft at the same rotational speed. The method of claim 1, At least a part of the outer part is immersed in oil, and the oil is evenly spread on the inner part, the transmission body, and the outer part by the rotation of the outer part. The method of claim 2, The clutch portion and the outer portion are surrounded by a motor shaft bracket that supports the shaft freely to rotate the motor shaft, and an output shaft bracket that supports the shaft freely to rotate the output shaft. A seal member for preventing leakage of the oil is disposed between the motor shaft and the motor shaft bracket, between the output shaft and the output shaft bracket, and between the motor shaft bracket and the output shaft bracket. Device.