CN214699060U - Self-lubricating transmission gear for engine of unmanned aerial vehicle - Google Patents

Abstract

The utility model discloses an unmanned aerial vehicle's self-lubricating drive gear for engine, including the gear main part, the mounting groove has all been seted up to the middle part lateral wall at the positive and back of gear main part, has seted up the second shaft groove jointly between the middle part of mounting groove, has all seted up first draw-in groove on the both sides of second shaft groove and the inner wall of last lower extreme, has all seted up a plurality of screws on the mounting groove inner wall at the positive and back of second shaft groove, the utility model discloses the beneficial effect who reaches is: the utility model relates to a but drive gear of self-lubricating, the utility model discloses an inside first oil storage chamber and the second oil storage chamber that is used for storing lubricating oil that has set up of gear main part, the inside third oil storage chamber that has the oil guide mechanism that has set up of tooth, gear main part is when rotating, the inside lubricating oil of first oil storage chamber and second oil storage chamber can be irritated the third and store up inside the oil chamber, the oil storage sponge piece of moist oil guide mechanism, oil guide sponge stick and fat liquoring sponge piece, utilize fat liquoring sponge piece to scribble lubricating oil on tooth, need not the manual work and lubricate, it is comparatively convenient.

Description

Self-lubricating transmission gear for engine of unmanned aerial vehicle

Technical Field

The utility model relates to a gear, in particular to unmanned aerial vehicle's self-lubricating drive gear for engine belongs to mechanical technical field.

Background

The wheel is one of the mechanical elements that have gear continuous meshing transmission motion and power on the rim, is commonly used, and the gear is all applied to many places, and unmanned aerial vehicle's engine will use the gear at the during operation, utilizes the transmission of gear, drives the inside other structures work of unmanned aerial vehicle.

At present, gear structure among unmanned aerial vehicle is a common transmission element mostly, because the gear uses behind the period, rusty phenomenon appears in the tooth surface of the gear tooth, so the staff need manually paint lubricating oil on the tooth of the gear tooth, the lubrication process is comparatively troublesome, and paint the in-process, lubricating oil supports in the inside other places of unmanned aerial vehicle easily, cause unnecessary waste, and the gear is mostly the integral type, gear during operation, the effort is mainly used in the tooth of the gear, make the load that the tooth of the gear bore great, the harm appears easily.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome prior art's defect, provide an unmanned aerial vehicle's self-lubricating drive gear for engine.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model relates to a self-lubricating transmission gear for an engine of an unmanned aerial vehicle, which comprises a gear main body, wherein the side wall of the middle part of the front surface and the back surface of the gear main body is provided with a mounting groove, a second shaft groove is jointly arranged between the middle parts of the mounting grooves, the inner walls of the two sides of the second shaft groove and the upper and lower ends are provided with first clamping grooves, the inner walls of the mounting grooves of the front surface and the back surface of the second shaft groove are provided with a plurality of screw holes, the screw holes at the same side are uniformly and annularly distributed at the periphery of the second shaft groove, the inside of the mounting groove is provided with a strengthening mechanism, the side walls of the front surface and the back surface of the gear main body are provided with a plurality of second clamping grooves, the second clamping grooves at the same side are uniformly and annularly distributed at the periphery of the mounting groove at the same side, a plurality of the second clamping grooves are communicated with the inside of the mounting groove at the same side, the outer wall of the circumference of the gear main body is fixedly connected with a plurality of teeth, the number of the teeth is the same as that of second clamping grooves formed in one side of the gear main body, the second clamping grooves correspond to one another, clamping plates are fixedly connected to the front side and the back side of the teeth, the clamping plates are of U-shaped structures, the opening parts of the clamping plates are located on one side close to the gear main body, the opening parts of the clamping plates are opposite to the second clamping grooves corresponding to the same side, fixing grooves are formed in one sides, away from the gear main body, of the teeth, third oil storage cavities are formed in the teeth, oil guide mechanisms are mounted in the third oil storage cavities, fourth oil guide channels are formed between the third oil storage cavities and the fixing grooves formed in the teeth, first oil guide channels are formed in one sides, close to the gear main body, of the third oil storage cavities, first oil storage cavities are formed in the middle of the inner sides of the gear main body, the first oil storage cavities are of annular structures, and second oil storage cavities are formed in the gear main body between the inner sides of the first oil storage cavities and the second shaft grooves, the second oil storage chamber is of an annular structure, a plurality of oil scraping plates are fixedly connected to the inner wall of the circumference of the second oil storage chamber, a third oil guide channel is formed in one side of the second oil storage chamber, and the third oil guide channel is communicated with the first oil storage chamber.

As a preferred technical proposal of the utility model, the reinforcing mechanisms all comprise fixed disks, the fixed disks are all clamped in the same side mounting grooves, a plurality of reinforcing plates are fixedly connected on the outer wall of the circumference of the fixed disk, the number of the reinforcing plates is the same as that of the second clamping grooves and corresponds to that of the second clamping grooves, the reinforcing plates are all clamped in the corresponding second clamping grooves, one ends of the reinforcing plates, which are far away from the fixed disks, are all clamped in the clamping plates corresponding to the second clamping grooves, a plurality of through holes are arranged on the fixed disks, a plurality of through holes at the upper ends of the same fixed disks are all annularly distributed on the fixed disks, the number of the through holes is the same as that of the screw holes arranged on the inner walls of the same side mounting grooves and corresponds to that of the screw holes, fastening bolts are all penetrated through and connected with the screw threads in the through holes, one ends of the fastening bolts, which are close to the gear main body, are all connected in the screw holes, first axle grooves are formed in the middle of the fixed disc, the diameter of each first axle groove is the same as that of each second axle groove, clamping strips are fixedly connected to the upper end and the lower end of one side, close to the gear body, of the fixed disc and fixedly connected to the two sides of the fixed disc, and the clamping strips are clamped inside first clamping grooves formed in the inner wall of each second axle groove respectively.

As a preferred technical scheme of the utility model, it all includes the oil storage sponge piece to lead oily mechanism, the inside in place third oil storage chamber is all fixed connection to the equal fixed connection of oil storage sponge piece, the equal fixedly connected with in one side that gear main part was kept away from to the oil storage sponge piece leads oily sponge stick, it all passes the fourth on the tooth of place to lead oily passageway and all extends to the fixed slot on the tooth of place to lead oily sponge stick's one end inside, lead inside the equal fixedly connected with fat liquoring sponge piece of one end that oily sponge stick is located the fixed slot, the fat liquoring sponge piece is kept away from the outside that the one side of place oily sponge stick of leading all is located the tooth of place.

As a preferred technical scheme of the utility model, the frizing all wraps up the fixed plate, the equal fixed connection of fixed plate is on second oil storage intracavity wall, two recesses have all been seted up to the inside of fixed plate, the recess all is L shape structure, the protruding portion of recess all communicates with each other with the outside of place fixed plate.

As an optimal technical scheme of the utility model, it leads oily passageway to have seted up a plurality of seconds on the circumference inner wall in first oil storage chamber, the quantity that oily passageway was led to the second is the same and the one-to-one with the quantity of tooth, the second is led oily passageway and is all communicated with each other with the first oily passageway of leading of seting up on the tooth that corresponds.

As the utility model discloses a preferred technical scheme, the oil filler point has been seted up on the positive lateral wall of gear main part, the inside in oil filler point and second oil storage chamber communicates with each other, the inside joint of oil filler point has the piston.

The utility model discloses the beneficial effect who reaches is:

1. the utility model relates to a but drive gear of self-lubricating, the utility model discloses an inside first oil storage chamber and the second oil storage chamber that is used for storing lubricating oil that has set up of gear main part, the inside third oil storage chamber that has the oil guide mechanism that has set up of tooth, gear main part is when rotating, the inside lubricating oil of first oil storage chamber and second oil storage chamber can be irritated the third and store up inside the oil chamber, the oil storage sponge piece of moist oil guide mechanism, oil guide sponge stick and fat liquoring sponge piece, utilize fat liquoring sponge piece to scribble lubricating oil on tooth, need not the manual work and lubricate, it is comparatively convenient.

2. Just the utility model discloses an oil storage sponge piece, lead oily sponge stick and fat liquoring sponge piece all have absorptive characteristic, and lubricating oil adsorbs in the inside of oil storage sponge piece, lead oily sponge stick and fat liquoring sponge piece, can avoid lubricated in-process lubricating oil to fall and cause the unnecessary extravagant.

3. The utility model discloses a set up reinforcing mechanism in the gear main part, utilize reinforcing plate that reinforcing mechanism increases the fastness of tooth and gear main part junction, share the load that the tooth bore, avoid tooth to damage because of the load that bears is great.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a sectional view of the present invention;

FIG. 2 is a view of the area at A in FIG. 1;

fig. 3 is a schematic structural view of the gear body of the present invention;

fig. 4 is an external structural view of the present invention;

fig. 5 is a schematic structural view of the fixing disc of the present invention;

fig. 6 is a schematic structural view of the tooth of the present invention.

In the figure: 1. a gear body; 2. mounting grooves; 3. a reinforcing mechanism; 31. fixing the disc; 32. a reinforcing plate; 33. A through hole; 34. fastening a bolt; 35. a first shaft groove; 36. clamping the strip; 4. a screw hole; 5. a first card slot; 6. A second card slot; 7. teeth; 8. an oil guide mechanism; 81. an oil storage sponge block; 82. oil-guiding sponge stick; 83. oiling a sponge block; 9. a scraper plate; 91. a fixing plate; 92. a groove; 10. a first oil storage chamber; 11. a second oil storage chamber; 12. a third oil storage chamber; 13. a first oil guide channel; 14. a second oil guide channel; 15. a second shaft groove; 16. a third oil guide channel; 17. a fourth oil guide channel; 18. fixing grooves; 19. clamping a plate; 20. and an oil filling hole.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Examples

As shown in figures 1-6, the utility model provides a self-lubricating transmission gear for an engine of an unmanned aerial vehicle, which comprises a gear body 1, wherein the side wall of the middle part of the front surface and the back surface of the gear body 1 is provided with a mounting groove 2, a second shaft groove 15 is jointly arranged between the middle parts of the mounting grooves 2, the inner walls of the two sides and the upper and lower ends of the second shaft groove 15 are provided with first clamping grooves 5, the inner walls of the mounting grooves 2 of the front surface and the back surface of the second shaft groove 15 are provided with a plurality of screw holes 4, the plurality of screw holes 4 on the same side are all annularly distributed on the periphery of the second shaft groove 15, a reinforcing mechanism 3 is arranged inside the mounting groove 2, the side walls of the front surface and the back surface of the gear body 1 are provided with a plurality of second clamping grooves 6, the plurality of second clamping grooves 6 on the same side are all annularly distributed on the periphery of the mounting groove 2 on the same side, the plurality of second clamping grooves 6 are all communicated with the inside of the mounting groove 2 on the same side, a plurality of teeth 7 are fixedly connected on the outer wall of the circumference of the gear body 1, the number of the teeth 7 is the same as that of the second clamping grooves 6 arranged on one side of the gear main body 1, the teeth 7 are in one-to-one correspondence with each other, clamping plates 19 are fixedly connected to the front side and the back side of each tooth 7, each clamping plate 19 is in a U-shaped structure, the opening of each clamping plate 19 is located on one side close to the gear main body 1, the opening of each clamping plate 19 is opposite to the corresponding second clamping groove 6 on the same side, fixing grooves 18 are formed in one side, away from the gear main body 1, of each tooth 7, third oil storage cavities 12 are formed in the teeth 7, oil guide mechanisms 8 are arranged in the third oil storage cavities 12, fourth oil guide channels 17 are formed between the third oil storage cavities 12 and the fixing grooves 18 formed in the teeth 7, first oil guide channels 13 are formed in one side, close to the gear main body 1, of each third oil storage cavity 12 is formed in the middle of the inner side of the gear main body 1, first oil storage cavities 10 are in an annular structure, the gear body 1 between the inner side of the first oil storage cavity 10 and the second shaft groove 15 is provided with a second oil storage cavity 11, the second oil storage cavity 11 is of an annular structure, the inner wall of the circumference of the second oil storage cavity 11 is fixedly connected with a plurality of oil scraping plates 9, one side of the second oil storage cavity 11 is provided with a third oil guide channel 16, the third oil guide channel 16 is communicated with the first oil storage cavity 10, lubricating oil can flow between the first oil storage cavity 10 and the second oil storage cavity 11 conveniently, the lubricating oil in the first oil storage cavity 10 is absorbed through the oil guide mechanism 8, and the lubricating oil is coated on the teeth 7.

A plurality of second oil guide channels 14 are arranged on the circumferential inner wall of the first oil storage cavity 10, the number of the second oil guide channels 14 is the same as that of the teeth 7 and corresponds to that of the teeth one by one, the second oil guide channels 14 are communicated with the first oil guide channels 13 arranged on the corresponding teeth 7, so that lubricating oil in the first oil storage cavity 10 can enter the third oil storage cavity 12 and can be transmitted to the oil guide mechanism 8, an oil filling hole 20 is arranged on the front side wall of the gear main body 1, the oil filling hole 20 is communicated with the inside of the second oil storage cavity 11, a piston is clamped in the oil filling hole 20, lubricating oil in the second oil storage cavity 11 can be supplemented through the oil filling hole 20, the reinforcing mechanism 3 comprises a fixed disc 31, the fixed disc 31 is clamped in the mounting groove 2 on the same side, a plurality of reinforcing plates 32 are fixedly connected to the circumferential outer wall of the fixed disc 31, the number of the reinforcing plates 32 is the same as that of the second clamping grooves 6 and corresponds to one by one, the reinforcing plates 32 are all clamped inside the corresponding second clamping grooves 6, one end of the reinforcing plate 32, far away from the fixed disc 31, is clamped inside the clamping plate 19 corresponding to the second clamping groove 6, the reinforcing plate 32 is convenient to fix on the teeth 7 and is stressed together with the teeth 7, a plurality of through holes 33 are formed in the fixed disc 31, the through holes 33 at the upper end of the same fixed disc 31 are all annularly distributed on the fixed disc 31, the number of the through holes 33 is the same as that of the screw holes 4 formed in the inner wall of the mounting groove 2 at the same side and one to one, the insides of the through holes 33 are all penetrated and in threaded connection with fastening bolts 34, one ends, close to the gear main body 1, of the fastening bolts 34 are all in threaded connection with the screw holes 4 corresponding to the through holes 33, the middle of the fixed disc 31 is provided with first shaft grooves 35, the diameters of the first shaft grooves 35 are all the same as that of the second shaft grooves 15, clamping strips 36 are fixedly connected with the upper end, the lower end and the two sides of the fixed disc 31, close to the gear main body 1, the clamping strips 36 are respectively clamped in the first clamping grooves 5 formed in the inner wall of the second shaft groove 15, the fixing disc 31 is fixed on the gear main body 1 through the fastening bolts 34, the reinforcing plate 32 is fixed on the gear main body 1, the reinforcing plate 32 is convenient to share the pressure borne by the teeth 7, the oil guide mechanisms 8 respectively comprise oil storage sponge blocks 81, the oil storage sponge blocks 81 are fixedly connected in the third oil storage cavity 12, oil guide sponge bars 82 are fixedly connected to one sides of the oil storage sponge blocks 81 far away from the gear main body 1, one ends of the oil guide sponge bars 82 far away from the oil storage sponge blocks 81 respectively penetrate through the fourth oil guide channels 17 on the teeth 7 and respectively extend to the inside of the fixing grooves 18 on the teeth 7, one ends of the oil guide sponge bars 82 in the fixing grooves 18 are fixedly connected with oil coating sponge blocks 83, one sides of the oil coating sponge blocks 83 far away from the oil guide sponge bars 82 are respectively located at the outer sides of the teeth 7, absorb lubricating oil through oil storage sponge piece 81, and give fat liquoring sponge piece 83 with lubricating oil transmission through leading oily sponge stick 82, scribble lubricating oil on tooth 7 through fat liquoring sponge piece 83, accomplish lubricated operation, frizing 9 all wraps up fixed plate 91, the equal fixed connection of fixed plate 91 is on second oil storage chamber 11 inner wall, two recesses 92 have all been seted up to fixed plate 91's inside, recess 92 all is L shape structure, the protruding part of recess 92 all communicates with each other with the outside of place fixed plate 91, store partial lubricating oil through the recess 92 of seting up on fixed plate 91, avoid the during operation, lubricating oil all flows into in first oil storage chamber 10, lead to fat liquoring sponge piece 83 absorptive lubricating oil too much and spill over.

Specifically, before the utility model is used, the utility model is installed in the interior of the unmanned aerial vehicle, the engine of the unmanned aerial vehicle drives the utility model to rotate, when the third oil guide channel 16 is lower than the lubricating oil level in the interior of the second oil storage chamber 11, the lubricating oil in the interior of the second oil storage chamber 11 is discharged into the interior of the first oil storage chamber 10 through the third oil guide channel 16, then the lubricating oil is discharged into the interior of the third oil storage chamber 12 through the second oil guide channel 14 and the first oil guide channel 13 in sequence, the lubricating oil entering the interior of the third oil storage chamber 12 is absorbed by the oil storage sponge block 81 of the oil guide mechanism 8, then the lubricating oil is transmitted to the oil coating sponge block 83 through the oil guide sponge block 82 by the oil storage sponge block 81, in the transmission process of the tooth 7 connected with the meshing, the oil coating sponge block 83 is extruded, the lubricating oil is extruded by the oil coating sponge block 83 and flows to the surface of the tooth 7, scribble simultaneously on engaged with tooth 7, accomplish lubricated operation, the utility model discloses the pivoted in-process, lubricating oil in the second oil storage chamber 11 is stirred to the fixed plate 91 of frizing 9, and recess 92 through seting up on the fixed plate 91 stores partial lubricating oil simultaneously, avoids the during operation, and lubricating oil all flows in first oil storage chamber 10, leads to fat liquoring sponge piece 83 absorptive lubricating oil too much and spills over, causes unnecessary waste, and the reinforcing plate 32 of strengthening mechanism 3 can share the pressure of bearing of tooth 7 simultaneously, prolongs the utility model discloses a life uses after a period, accessible oil filler point 20 supplementary second oil storage chamber 11 inside lubricating oil can.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle is characterized by comprising a gear main body (1), wherein mounting grooves (2) are formed in the side walls of the middle parts of the front surface and the back surface of the gear main body (1), a second shaft groove (15) is formed between the middle parts of the mounting grooves (2), first clamping grooves (5) are formed in the inner walls of the two sides and the upper and lower ends of the second shaft groove (15), a plurality of screw holes (4) are formed in the inner walls of the mounting grooves (2) in the front surface and the back surface of the second shaft groove (15), the screw holes (4) in the same side are distributed on the periphery of the second shaft groove (15) in an annular manner, reinforcing mechanisms (3) are arranged in the mounting grooves (2), a plurality of second clamping grooves (6) in the same side are formed in the side walls of the front surface and the back surface of the gear main body (1), and a plurality of second clamping grooves (6) in the same side are distributed on the periphery of the mounting groove (2) in the same side in an annular manner, the plurality of second clamping grooves (6) are communicated with the inside of the mounting groove (2) on the same side, a plurality of teeth (7) are fixedly connected to the outer wall of the circumference of the gear main body (1), the number of the teeth (7) is the same as that of the second clamping grooves (6) formed in one side of the gear main body (1), the teeth are in one-to-one correspondence, clamping plates (19) are fixedly connected to the front and the back of the teeth (7), the clamping plates (19) are in U-shaped structures, the opening parts of the clamping plates (19) are located on one side close to the gear main body (1), the opening parts of the clamping plates (19) are opposite to the second clamping grooves (6) corresponding to the same side, fixing grooves (18) are formed in one sides, far away from the gear main body (1), of the teeth (7), third oil storage cavities (12) are formed in the teeth, and oil guide mechanisms (8) are installed in the third oil storage cavities (12), a fourth oil guide channel (17) is arranged between the third oil storage cavity (12) and a fixed groove (18) arranged on the tooth (7), one side of the third oil storage cavity (12) close to the gear body (1) is provided with a first oil guide channel (13), a first oil storage cavity (10) is formed in the middle of the inner side of the gear body (1), the first oil storage cavity (10) is of an annular structure, a second oil storage cavity (11) is arranged on the gear body (1) between the inner side of the first oil storage cavity (10) and the second shaft groove (15), the second oil storage cavity (11) is of an annular structure, a plurality of oil scraping plates (9) are fixedly connected on the circumferential inner wall of the second oil storage cavity (11), and a third oil guide channel (16) is formed in one side of the second oil storage cavity (11), and the third oil guide channel (16) is communicated with the first oil storage cavity (10).

2. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle as claimed in claim 1, wherein the reinforcing mechanisms (3) comprise fixed disks (31), the fixed disks (31) are all clamped in the mounting grooves (2) on the same side, a plurality of reinforcing plates (32) are fixedly connected to the outer circumferential wall of the fixed disks (31), the number of the reinforcing plates (32) is the same as that of the second clamping grooves (6), the reinforcing plates (32) are all clamped in the corresponding second clamping grooves (6), one ends of the reinforcing plates (32) far away from the fixed disks (31) are all clamped in the clamping plates (19) corresponding to the second clamping grooves (6), the fixed disks (31) are provided with a plurality of through holes (33), and a plurality of through holes (33) at the upper ends of the same fixed disks (31) are all annularly distributed on the fixed disks (31), the quantity of through-hole (33) is equal and screw (4) quantity the same and the one-to-one seted up on homonymy mounting groove (2) inner wall, and is a plurality of the inside of through-hole (33) all runs through and threaded connection has fastening bolt (34), fastening bolt (34) are close to the equal threaded connection in screw (4) that through-hole (33) at place correspond of one end of gear main part (1) inside, first shaft groove (35) have all been seted up at the middle part of fixed disk (31), the diameter of first shaft groove (35) is equal and the diameter of second shaft groove (15) is the same, the fixed disk (31) are close to the equal fixedly connected with card strip (36) in lower extreme and both sides on one side of gear main part (1), card strip (36) joint is inside first draw-in groove (5) of seting up on second shaft groove (15) inner wall respectively.

3. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle of claim 1, the oil guide mechanisms (8) respectively comprise oil storage sponge blocks (81), the oil storage sponge blocks (81) are respectively and fixedly connected with the inner part of the third oil storage cavity (12), one side of the oil storage sponge block (81) far away from the gear main body (1) is fixedly connected with an oil guide sponge rod (82), one end of the oil guide sponge rod (82) far away from the oil storage sponge block (81) penetrates through the fourth oil guide channel (17) on the tooth (7) and extends into the fixing groove (18) on the tooth (7), one end of the oil guide sponge rod (82) positioned in the fixed groove (18) is fixedly connected with an oil coating sponge block (83), one side of the oil coating sponge block (83), which is far away from the oil guide sponge rod (82), is positioned outside the teeth (7).

4. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle as claimed in claim 1, wherein the oil scraping plates (9) are wrapped by fixing plates (91), the fixing plates (91) are fixedly connected to the inner wall of the second oil storage cavity (11), two grooves (92) are formed in the fixing plates (91), the grooves (92) are in L-shaped structures, and protruding portions of the grooves (92) are communicated with the outer portions of the fixing plates (91).

5. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle as claimed in claim 1, wherein a plurality of second oil guide channels (14) are formed in the circumferential inner wall of the first oil storage cavity (10), the number of the second oil guide channels (14) is the same as that of the teeth (7) and corresponds to that of the teeth (7), and the second oil guide channels (14) are communicated with the first oil guide channels (13) formed in the corresponding teeth (7).

6. The self-lubricating transmission gear for the engine of the unmanned aerial vehicle as claimed in claim 1, wherein an oil filling hole (20) is formed in a front side wall of the gear body (1), the oil filling hole (20) is communicated with the inside of the second oil storage cavity (11), and a piston is clamped inside the oil filling hole (20).

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