CN201998236U - Oil pump for chain saw - Google Patents

Abstract

The utility model discloses an oil pump for a chainsaw, which comprises a pump body arranged on a support plate of the chainsaw. The pump body is provided with an oil inlet and an oil outlet. Piston rod, a transmission mechanism is provided between the front end of the piston rod and the shaft head of the chainsaw output shaft to make the piston rod rotate with the rotation of the output shaft, and a rotating guide structure is provided between the piston rod and the pump body to make the piston rod rotate When doing horizontal reciprocating motion relative to the pump body, there is a position adjustment structure between the pump body and the chain saw support plate to make the pump body deflect left and right relative to the chain saw support plate, and the position adjustment structure is provided to adjust the position of the pump body to keep the transmission mechanism Elastic correction device for precise transmission. The utility model has a simple and reasonable structure, is reliable and practical, not only improves the precision of the oil pump piston control, but also improves the stability of the oil pumping volume of the oil pump, and is energy-saving and environment-friendly.

Description

Oil pump for chainsaw

technical field

The utility model relates to a lubricating oil pump, in particular to an oil pump for a chain saw.

Background technique

Chain saws are widely used in households, gardens, forests and other fields. When the chain saw is working, the transmission mechanism and the saw chain are running at high speed. Due to the friction will generate a lot of heat, it needs to be lubricated in time to prevent the saw chain from overheating. The chainsaw is damaged or even the user is injured. At present, there are mainly plunger oil pumps, worm gear oil pumps, and manual oil pumps on the market. However, during the use of chain saws, debris such as wood chips can easily block the oil outlet, causing the oil pump to not produce oil. Under the severe vibration environment during work, the oil pump is easy to shift due to the unstable fixing method, and even collides with the transmission mechanism or the saw chain to cause damage.

A utility model patent named chain saw was authorized and announced by the State Intellectual Property Office of China on February 11, 2009. The authorized announcement number is CN201192009Y. The patent specification discloses a chain saw, including an oil supply device. The oil supply device includes For the oil pump, the cam linked by the transmission mechanism interferes with the plunger of the oil pump to realize the reciprocating motion of the plunger to pump oil. Although this structure uses the kinetic energy of the transmission mechanism to realize the reciprocating movement of the oil pump plunger, the cam structure does not Stable and inaccurate, it is easy to cause irregular reciprocating motion of the plunger, which will cause uneven changes in the pressure in the oil pump and the pump oil volume, and oil leakage will easily occur, which not only causes waste of resources, but also affects the use of users and affects the environment. There is also some degree of pollution.

Utility model content

The problem to be solved by the utility model is to provide an oil pump for a chain saw, which has a simple, reasonable, reliable and practical structure, which not only improves the precision of the oil pump piston control, but also improves the stability of the oil pumped by the oil pump, which is energy-saving and environmentally friendly.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: an oil pump for a chainsaw, including a pump body arranged on the support plate of the chainsaw, an oil inlet and an oil outlet are arranged on the pump body, and a There is a piston rod that reciprocates horizontally relative to the pump body, and the feature is that a transmission mechanism is set between the front end of the piston rod and the shaft head of the output shaft of the chainsaw to make the piston rod rotate with the rotation of the output shaft. There is a rotating guide structure between the pump body to make the piston rod reciprocate horizontally relative to the pump body when it rotates. The adjustment structure is equipped with an elastic correction device to adjust the position of the pump body so that the transmission mechanism can maintain accurate transmission.

Further, the transmission mechanism is an meshing transmission mechanism, which includes a worm wheel arranged at the front end of the piston rod and a worm arranged at the head of the output shaft of the chainsaw to mesh with the worm wheel, and the said worm is arranged on the right side of the worm wheel. Mesh transmission makes the oil flow more even.

Further, the rotating guide structure includes an annular groove on the piston rod surrounding the outer surface of the piston rod and a guide body fixed on the pump body. The guide body is provided with a ring extending into the ring groove and For the matching protruding block, the plane where the annular groove is located is inclined relative to the axis of the piston rod, and the distance between the two ends of the projection of the annular groove on the axis of the piston rod is not greater than the stroke of the piston rod.

Further, the piston rod is provided with a sleeve fixed with an interference fit with the piston rod, and an annular groove is provided on the outer wall of the sleeve.

Further, the pump body is provided with a piston sleeve, the piston sleeve is in interference fit with the pump body, the oil inlet and the oil outlet are both connected to the inner cavity of the piston sleeve, and the piston rod cooperates with the inner cavity wall of the piston sleeve to form a movement relative to the pump body. Horizontal reciprocating motion. Since the oil pump has high requirements on sealing, the piston sleeve and the piston rod are added to cooperate, and the piston sleeve can be produced and processed separately, which is convenient to improve the precision and has good interchangeability.

Further, the front end of the piston sleeve protrudes from the pump body, the guide body is arranged at the front end of the piston sleeve, a positioning protrusion is provided on the outer surface of the pump body, and a clasp extending backward is provided on the guide body to fasten the positioning The guide is positioned on the protrusion.

Further, the position adjustment structure includes a positioning column I and a positioning column II arranged on the chainsaw support plate, and also includes an adapter ring arranged on the right side of the pump body and a limit ring body arranged on the left side of the pump body , the limit ring body is provided with a waist hole, the positioning column I is located on the right side of the pump body and transferred to the transfer ring body, the positioning column II is located on the left side of the pump body and passes through the waist hole, the length of the waist hole is longer than the positioning The diameter of the top of the column II. The elastic correction device includes a torsion spring arranged on the positioning column I. The head of the torsion spring bypasses the pump body and rests on the rear side of the limit ring to keep the pump body centered on the positioning column I. Clockwise trend. Through the elastic force of the torsion spring, the pump body is deflected to the right relative to the axis of the pump body at the initial position, and the piston rod is driven to deflect to the right, so that the worm wheel and the worm are kept tightly meshed; at the same time, when the chain saw is working, it is often accompanied by severe vibrations, and the pump The body may deflect to the left relative to the axis of the pump body at the initial position, so that the worm gear and the worm are disengaged. Adding a torsion spring can avoid such a situation.

After adopting the above technical solution, the utility model has the following advantages: convenient installation, improved service life, uniform oil output, and energy saving.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the structural representation of a kind of embodiment of the utility model;

Fig. 2 is a schematic diagram of the internal structure of the embodiment shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the annular groove on the sleeve.

Detailed ways

As shown in Figures 1 to 3, the structure diagram of an embodiment of the utility model, an oil pump for a chainsaw, includes a pump body 1 arranged on a chainsaw support plate 8, and the pump body is provided with an oil inlet 11 and an oil outlet Oil port 12, the pump body is provided with a piston rod 2 that moves horizontally reciprocating relative to the pump body, and a transmission mechanism is provided between the front end of the piston rod and the shaft head of the chainsaw output shaft 9 so that the piston rod rotates with the output shaft Rotation, a rotating guide structure is set between the piston rod and the pump body to make the piston rod reciprocate horizontally relative to the pump body when rotating, and a position adjustment structure is set between the pump body and the chainsaw support plate to make the pump body relative to the chainsaw support plate Left and right deflection, the position adjustment structure is equipped with an elastic correction device to adjust the position of the pump body to keep the transmission mechanism in precise engagement.

The transmission mechanism is an meshing transmission mechanism, which includes a worm wheel 21 arranged at the front end of the piston rod and a worm 91 arranged at the shaft head of the chainsaw output shaft to mesh with the worm wheel, and the said worm is arranged on the right side of the worm wheel. The rotation guide structure includes an annular groove 22 arranged on the piston rod and surrounding the outer surface of the piston rod and a guide body 3 fixed on the pump body. The protruding block 31, the plane where the annular groove is located is inclined relative to the axis of the piston rod, and the distance between the two ends of the projection of the annular groove on the axis of the piston rod is not greater than the stroke of the piston rod. In this embodiment, the piston rod is provided with a sleeve 4 which is fixed with an interference fit with the piston rod, and an annular groove is provided on the outer wall surface of the sleeve. The pump body is provided with a piston sleeve 5, the piston sleeve and the pump body have an interference fit, the oil inlet and the oil outlet are connected to the inner cavity of the piston sleeve, and the piston rod cooperates with the inner cavity wall of the piston sleeve to reciprocate horizontally relative to the pump body sports. The front end of the piston sleeve stretches out of the pump body, the guide body is arranged on the front end of the piston sleeve, and a positioning protrusion 13 is arranged on the outer surface of the pump body, and a clasp 32 extending backward is provided on the guide body to buckle on the positioning protrusion. Position the guide body. The position adjustment structure includes a positioning column I81 and a positioning column II82 arranged on the chainsaw support plate, and also includes an adapter ring 14 on the right side of the pump body and a limiting ring 15 on the left side of the pump body. There is a waist hole 16 on the limit ring body, the positioning column I is set on the right side of the pump body to connect with the transfer ring body, the positioning column II is set on the left side of the pump body and passes through the waist hole, the length of the waist hole is longer than the positioning The diameter of the top of the column II, the elastic correction device includes a torsion spring 6 arranged on the positioning column I, the head 61 of the torsion spring bypasses the pump body and presses against the rear side of the limit ring to keep the pump body to position the column I The trend of clockwise rotation of the center. In this embodiment, only one head of the torsion spring is pressed against the limiting ring to realize its function. The main function of the torsion spring is to adjust the meshing distance between the worm wheel and the worm. When the worm gear and worm mesh too tightly after installation, the friction force is very large, and long-term work will cause serious wear and tear of the worm gear and worm, which may cause the oil pump to not produce oil. No oil will come out. After adopting the torsion spring, the gap between the worm wheel and the worm can be eliminated due to the elastic force of the torsion spring. Therefore, when installing the worm gear and the worm, it is not necessary to install the worm gear and the worm in close fit directly, but only need to correspond in position, which simplifies the installation process.

In the above embodiment, the worm is set on the right side of the worm wheel, so the torsion spring is set on the right side of the pump body, so that the pump body is deflected to the right relative to the axis of the pump body, and if the worm is set on the left side of the worm wheel, Correspondingly, the torsion spring is arranged on the left side of the pump body, so that the pump body can deflect to the left relative to the axis of the pump body.

In addition to the above-mentioned preferred embodiment, the utility model also has other implementation modes, those skilled in the art can make various changes and deformations according to the utility model, as long as they do not depart from the spirit of the utility model, all should belong to the appended rights of the utility model The scope defined by the requirement.

Claims (7)

1. An oil pump for a chainsaw, comprising a pump body (1) located on the chainsaw support plate (8), the pump body is provided with an oil inlet (11) and an oil outlet (12), and the pump body is provided with There is a piston rod (2) that reciprocates horizontally relative to the pump body, and its feature is that a transmission mechanism is set between the front end of the piston rod and the shaft head of the chainsaw output shaft (9) so that the piston rod rotates with the output shaft Rotation, a rotating guide structure is set between the piston rod and the pump body to make the piston rod reciprocate horizontally relative to the pump body when rotating, and a position adjustment structure is set between the pump body and the chainsaw support plate to make the pump body relative to the chainsaw support plate Left and right deflection, the position adjustment structure is equipped with an elastic correction device to adjust the position of the pump body so that the transmission mechanism can maintain accurate transmission. 2. The oil pump for chainsaw according to claim 1, characterized in that: the transmission mechanism is an engagement transmission mechanism, and the engagement transmission mechanism includes a worm wheel (21) arranged at the front end of the piston rod and a worm gear (21) arranged at the chainsaw output shaft. A worm screw (91) whose shaft head is engaged with the worm wheel, and the worm wheel is arranged on the right side of the worm wheel. 3. A kind of oil pump for chainsaw according to claim 1, characterized in that: the said rotation guiding structure comprises an annular groove (22) which is arranged on the piston rod and surrounds the outer surface of the piston rod and fixed on the pump body The guide body (3) is provided with a protruding block (31) that extends into the ring groove and matches with the ring groove. The distance between the two ends of the upper projection is not greater than the stroke of the piston rod. 4. An oil pump for a chainsaw according to claim 3, characterized in that: the piston rod is provided with a sleeve (4) fixed with an interference fit with the piston rod, and an annular groove is arranged on the outside of the sleeve. on the wall. 5. The oil pump for chainsaw according to claim 1, characterized in that: the pump body is provided with a piston sleeve (5), the piston sleeve and the pump body have an interference fit, and the oil inlet and the oil outlet are both It communicates with the inner cavity of the piston sleeve, and the piston rod cooperates with the inner cavity wall of the piston sleeve to perform horizontal reciprocating motion relative to the pump body. 6. The oil pump for chainsaw according to claim 5, characterized in that: the front end of the piston sleeve protrudes from the pump body, the guide body is arranged at the front end of the piston sleeve, and a positioning protrusion is arranged on the outer surface of the pump body. (13), the guide body is provided with a clasp (32) extending backwards to buckle on the positioning protrusion to position the guide body. 7. The oil pump for a chainsaw according to claim 1, characterized in that: the position adjustment structure includes a positioning column I (81) and a positioning column II (82) arranged on the chainsaw support plate, and also includes The adapter ring body (14) located on the right side of the pump body and the limit ring body (15) located on the left side of the pump body, the limit ring body is provided with a waist hole (16), and the positioning column 1 is located on the pump body The right side is connected with the transfer ring body. The positioning column II is set on the left side of the pump body and passes through the waist hole. The length of the waist hole is greater than the diameter of the top of the positioning column II. The elastic correction device includes a The torsion spring (6), the head (61) of the torsion spring walks around the pump body against the rear side of the spacer ring body and makes the pump body keep taking the positioning post 1 as the center to rotate clockwise.

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