CN112762160A

CN112762160A - Novel plastic gear

Info

Publication number: CN112762160A
Application number: CN202110142264.0A
Authority: CN
Inventors: 叶伟青
Original assignee: Shaoxing Shangyu Rongda Industrial Co ltd
Current assignee: Shaoxing Shangyu Rongda Industrial Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-05-07
Anticipated expiration: 2041-02-02
Also published as: CN112762160B

Abstract

The invention discloses a novel plastic gear, which has the technical scheme that: including the body, be provided with a plurality of tooth pieces along the circumferencial direction on the body periphery wall, be formed with the tooth's socket between the adjacent tooth piece, the slot has been seted up on the body, a plurality of radiating grooves have been seted up along the circumferencial direction on the slot internal perisporium, the radiating groove extends to the tooth piece along the direction of keeping away from the body axis inside, the inside heat dissipation cover that is provided with of slot, there are a plurality of fin that are used for the card to go into the radiating groove along radially sliding connection on the heat dissipation cover periphery wall, the inside detachably of heat dissipation cover is connected. The invention has the following beneficial effects: the heat generated by friction after the tooth blocks are meshed is conducted and absorbed through the radiating fins, so that the heat is easy to dissipate, the plastic gear is prevented from generating thermal deformation, and the service life of the plastic gear is prolonged.

Description

Novel plastic gear

Technical Field

The invention relates to a transmission part, in particular to a novel plastic gear.

Background

With the application of new materials and the development of manufacturing technology, the precision of the plastic gear is higher and higher, the service life is longer and longer, and the plastic gear is widely applied to industries such as instruments, toys, automobiles, printers and the like. Compared with metal gears, plastic gears have the advantages of light weight, low working noise, wear resistance, no need of lubrication, capability of forming more complex shapes, low mass production cost and the like.

The existing plastic gear is generally made by injection molding, which is a molding method that thermoplastic plastic or thermosetting plastic is heated and melted in a charging barrel to a flowing state, then the molten plastic is injected into a mold cavity with lower temperature through a nozzle under certain continuous high pressure by a plunger or a screw in an injection device, the molten plastic is compressed and moves forwards, and is solidified after cooling or chemical crosslinking, and the plastic part is ejected by matching an ejection device of an injection mold with an ejection system of an injection machine.

However, since plastic has the characteristics of relatively weak strength, sensitivity to temperature and the like, when the plastic gear is meshed and rotates, the meshing position of adjacent gears generates heat due to friction, the heat is difficult to dissipate, and after the heat is excessively accumulated, the plastic gear is easily subjected to thermal deformation, so that the service life of the plastic gear is influenced.

Therefore, a new solution is needed to solve this problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a novel plastic gear which is not easy to generate thermal deformation.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a novel plastic gear, includes the body, be provided with a plurality of tooth pieces along the circumferencial direction on the body periphery wall, it is adjacent be formed with the tooth's socket between the tooth piece, the slot has been seted up on the body, a plurality of radiating grooves have been seted up along the circumferencial direction on the slot internal perisporium, the radiating groove extends to inside the tooth piece along the direction of keeping away from the body axis, the inside heat dissipation cover that is provided with of slot, there are a plurality of fin that are used for the card to go into the radiating groove along radial sliding connection on the heat dissipation cover periphery wall, the inside detachably of heat dissipation cover is connected with and is.

By adopting the technical scheme, as the heat dissipation sleeve is arranged in the slot, when in actual use, the heat dissipation sheet on the heat dissipation sleeve is pushed towards the inside of the heat dissipation sleeve so that the heat dissipation sheet does not protrude out of the surface of the heat dissipation sleeve any more, then the heat dissipation sleeve is inserted into the slot of the body and is aligned with the heat dissipation grooves on the inner peripheral wall of the slot, then the heat dissipation sheet is pushed into the heat dissipation grooves so that the heat dissipation sheet is clamped into the heat dissipation grooves, the heat dissipation sheet is limited by the heat dissipation grooves and the heat dissipation sleeve by the heat dissipation sheet, the slot is not easy to be drawn out of the heat dissipation sleeve, then the oil storage block is arranged in the heat dissipation sleeve, the heat dissipation sheet is not easy to slide by the oil storage block, the installation operation of the heat dissipation sleeve is finished, the operation is convenient and fast, the heat generated by friction after the tooth blocks are meshed through the, the service life of the plastic gear is prolonged.

The invention is further configured to: the oil storage block top periphery wall is provided with the external screw thread structure, set up on the internal perisporium in heat dissipation cover top with external screw thread structure assorted internal thread structure.

Through adopting above-mentioned technical scheme, because be provided with the external screw thread structure on the oil storage piece top periphery wall, set up on the heat dissipation cover top internal perisporium with external screw thread structure assorted internal thread structure, when installation oil storage piece, in passing through external screw thread structure screw in heat dissipation cover with the oil storage piece, realized the connection dismantled of oil storage piece in the heat dissipation cover to threaded connection has the characteristics that connection convenient operation is swift, makes in the oil storage piece can stabilize and convenient mounting groove heat dissipation cover.

The invention is further configured to: the relative direction of fin middle-end both sides side direction is buckled and is formed with and holds the chamber, it is provided with the sponge piece to hold the intracavity, set up the oil outlet that is linked together with the radiating groove on the tooth piece lateral wall, set up a plurality of inlet ports that are linked together with holding the chamber on the heat dissipation cover internal perisporium, a plurality of logical oilholes have been seted up along the circumferencial direction array on the oil storage piece periphery wall, the oil storage chamber has been seted up at oil storage piece top, set up a plurality of oil grooves of leading that are linked together with logical oilhole on the oil storage intracavity diapire, oil storage chamber top inside rotates and is connected with the closing cap, be provided with a plurality of sealing members that are used for sealed oil groove of leading on the closing cap.

By adopting the technical scheme, because the sponge block is arranged in the containing cavity of the radiating fin, and the oil storage cavity is arranged in the oil storage block, when in use, lubricating oil can enter the oil storage cavity and be stored through injecting the lubricating oil to the oil filling hole of the sealing cover, the lubricating oil can not flow into the oil guide groove through the sealing effect of the sealing element on the oil guide groove, when the meshing part of the tooth block needs to be lubricated, the sealing cover is rotated to separate the sealing element from the oil guide groove, so that the lubricating oil can flow into the oil guide groove under the action of gravity and finally flow into the containing cavity through the oil guide groove, the oil through hole and the oil inlet hole and is absorbed by the sponge block, because the oil outlet is arranged on the side wall of the tooth block, after the lubricating oil is absorbed by the sponge block, the lubricating oil can gradually overflow the oil outlet so as to lubricate the inner wall of the tooth socket, thereby reducing, thereby reducing the friction heat generation and further prolonging the service life of the body.

The invention is further configured to: the sealing member includes sliding connection and is in the seal pin on the closing cap, the seal pin bottom is provided with and is used for the card to go into the plug of leading the oil groove, the plug is hemispherical.

Through adopting above-mentioned technical scheme, because the sealing member includes sliding connection at the seal pin on the closing cap, and the seal pin bottom is provided with and is hemispherical plug, make when lubricating oil is poured into to needs, rotate the closing cap, make the seal pin rotate thereupon, because the plug is hemispherical, make plug atress upwards slide gradually and make seal pin protrusion closing cap surface, be about to the oil storage chamber and lead the oil groove and switch on, and be convenient for survey the on-state, after need not pour into lubricating oil into, the closing cap rotates once more, make the seal pin rotate thereupon and make plug card go into lead in the oil groove, the sealed operation of leading the oil groove has been accomplished promptly, high convenience and fast in operation, time saving and labor saving.

The invention is further configured to: offer a plurality of draw-in grooves that are used for the seal pin card to go into on the closing cap, seal pin periphery wall both sides all are provided with the slider, the spout that is used for the slider card to go into is all offered to draw-in groove internal perisporium both sides.

Through adopting above-mentioned technical scheme, because seal pin periphery wall both sides all are provided with the slider, the spout that is used for the slider card to go into is all offered to draw-in groove internal perisporium both sides, slides in the spout through the slider, has realized the sliding connection of seal pin in the draw-in groove to spacing through the spout to the slider, make the seal pin can only carry out axial motion in the draw-in groove, the slip process is more stable smooth and easy.

The invention is further configured to: and a pressure spring is arranged between the sliding block and the inner top wall of the sliding groove.

Through adopting above-mentioned technical scheme, because be provided with the pressure spring between the roof in slider and the spout, thereby make when rotating the closing cap, the slider upwards slides in the spout thereupon, thereby make the compression spring atress compress and produce the elasticity of reconversion, continue to rotate the closing cap, make the plug aim at and lead behind the oil groove, thereby because the pressure spring no longer receives the extrusion reconversion, and make the slider drive sealed round pin pop out to the direction of keeping away from the pressure spring, thereby make the plug card go into lead in the oil groove, and make the plug be difficult for breaking away from and lead the oil groove, sealed effect is better.

The invention is further configured to: and a plurality of connecting ribs are arranged on the top surface of the sealing cover along the circumferential direction in an array manner.

Through adopting above-mentioned technical scheme, because be provided with the splice bar on the closing cap top surface, the operation that sets up to rotating the closing cap of splice bar provides the point of application of force for the staff can drive the closing cap rotation through holding between the fingers the splice bar and rotating, and the operation is more convenient laborsaving.

The invention is further configured to: the transversal isosceles trapezoid and little head end orientation oil storage chamber of personally submitting of oil filler point, the inside detachably of oil filler point is connected with the sealing plug of being made by rubber materials.

Through adopting above-mentioned technical scheme, because the transversal isosceles trapezoid that personally submits of oil filler point for the lubricating oil in the oil storage cavity is difficult for flowing out from the oil filler point, and is provided with the sealing plug in the oil filler point, through the sealing plug to the sealing of oil filler point, makes lubricating oil be difficult for leaking more.

The invention is further configured to: the top surface of the oil storage block is connected with a bolt in a sliding mode along the radial direction, and the top surface of the sealing cover is provided with an embedded groove used for clamping the bolt.

Through adopting above-mentioned technical scheme, because oil storage piece top surface sliding connection has the bolt, seted up the caulking groove on the closing cap, when need not using the closing cap, promote the bolt and make the bolt card go into in the caulking groove, spacing through the bolt to the closing cap for the difficult emergence of closing cap is rotated, thereby makes the difficult slip of seal pin lead to leading the oil groove to open, thereby makes the storage of lubricating oil more safe and stable.

The invention is further configured to: the body is prepared from raw materials of, by weight, 95 parts of polyformaldehyde resin, 15 parts of nanocarbon sol, 11 parts of graphite fluoride, 8 parts of tungsten boride, 13 parts of thermoplastic polyurethane elastomer, 4 parts of maleic anhydride grafted polyethylene, 5 parts of titanosilicate powder, 7 parts of aluminum-zirconium coupling agent, 3 parts of mica powder and 2 parts of magnesium naphthenate.

By adopting the technical scheme, the tungsten boride, the nanocarbon sol and the graphite fluoride are added into the ingredients, so that the friction coefficient of the polyformaldehyde resin is improved, the friction resistance is reduced, the gear is not easy to rub to generate heat and deform, the crystallinity of polyformaldehyde can be improved by the aid of the titanium glow powder and the mica powder, and the wear resistance and hardness of the gear body are improved.

In conclusion, the invention has the following beneficial effects: the heat generated by friction after the tooth blocks are meshed is conducted and absorbed through the radiating fins, so that the heat is easy to dissipate, the plastic gear is prevented from generating thermal deformation, and the service life of the plastic gear is prolonged.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second schematic structural view of the present invention;

FIG. 3 is a schematic structural view of a heat dissipation sleeve according to the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic view of the structure of the oil reservoir block of the present invention;

FIG. 6 is a half-sectional view of an oil reservoir block according to the present invention;

fig. 7 is an enlarged schematic view of the structure at B in fig. 6.

Reference numerals: 1. a body; 2. a tooth block; 3. a tooth socket; 4. a slot; 5. a heat sink; 6. a heat dissipation sleeve; 7. a heat sink; 8. an oil storage block; 9. an accommodating chamber; 10. a sponge block; 11. an oil outlet hole; 12. an oil inlet hole; 13. an oil through hole; 14. an oil storage chamber; 15. an oil guide groove; 16. sealing the cover; 17. an oil filler hole; 18. a seal pin; 19. a plug; 20. a card slot; 21. a slider; 22. a chute; 23. a pressure spring; 24. connecting ribs; 25. a sealing plug; 26. a bolt; 27. and (4) caulking grooves.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 7, a novel plastic gear comprises a body 1, a plurality of tooth blocks 2 are arranged on the outer circumferential wall of the body 1 along the circumferential direction, tooth grooves 3 are formed between adjacent tooth blocks 2, a slot 4 is formed on the body 1, a plurality of heat dissipation grooves 5 are formed on the inner circumferential wall of the slot 4 along the circumferential direction, the heat dissipation grooves 5 extend into the tooth blocks 2 along the direction away from the central axis of the body 1, a heat dissipation sleeve 6 is arranged inside the slot 4, a plurality of heat dissipation fins 7 for being clamped into the heat dissipation grooves 5 are connected to the outer circumferential wall of the heat dissipation sleeve 6 along the radial direction in a sliding manner, an oil storage block 8 for abutting against the heat dissipation fins 7 to limit the sliding of the heat dissipation fins 7 is detachably connected inside the heat dissipation sleeve 6, an external thread structure is arranged on the outer circumferential wall of the top end of the oil storage block 8, an internal thread structure matched with the external thread, a sponge block 10 is arranged in the accommodating cavity 9, an oil outlet 11 communicated with the radiating groove 5 is arranged on the side wall of the tooth block 2, a plurality of oil inlets 12 communicated with the accommodating cavity 9 are arranged on the inner peripheral wall of the radiating sleeve 6, a plurality of oil through holes 13 are arranged on the outer peripheral wall of the oil storage block 8 in an array manner along the circumferential direction, an oil storage cavity 14 is arranged at the top of the oil storage block 8, a plurality of oil guide grooves 15 communicated with the oil through holes 13 are arranged on the inner bottom wall of the oil storage cavity 14, a sealing cover 16 is rotatably connected inside the top end of the oil storage cavity 14, a plurality of sealing elements for sealing the oil guide grooves 15 are arranged on the sealing cover 16, an oil filling hole 17 communicated with the oil storage cavity 14 is arranged on the sealing cover 16, the cross section of the oil filling hole 17 is isosceles trapezoid, the small end of the oil filling hole 17 faces the oil storage cavity 14, the sealing cover 16 is provided with a plurality of clamping grooves 20 for clamping the sealing pin 18, two sides of the outer peripheral wall of the sealing pin 18 are respectively provided with a slide block 21, two sides of the inner peripheral wall of the clamping grooves 20 are respectively provided with a slide groove 22 for clamping the slide block 21, a pressure spring 23 is arranged between the slide block 21 and the inner top wall of the slide groove 22, the bottom end of the sealing pin 18 is provided with a plug 19 for clamping the oil guide groove 15, the plug 19 is hemispherical, the top surface of the sealing cover 16 is provided with a plurality of connecting ribs 24 along the circumferential direction in an array manner, the top surface of the oil storage block 8 is connected with a bolt 26 in a sliding manner along the radial direction, the top surface of the sealing cover, 95 parts of polyformaldehyde resin, 15 parts of nanocarbon sol, 11 parts of graphite fluoride, 8 parts of tungsten boride, 13 parts of thermoplastic polyurethane elastomer, 4 parts of maleic anhydride grafted polyethylene, 5 parts of titanite powder, 7 parts of aluminum-zirconium coupling agent, 3 parts of mica powder and 2 parts of magnesium naphthenate.

Because the heat dissipation sleeve 6 is arranged in the slot 4, when in actual use, the heat dissipation sheet 7 on the heat dissipation sleeve 6 is pushed towards the inside of the heat dissipation sleeve 6, so that the heat dissipation sheet 7 does not protrude out of the surface of the heat dissipation sleeve 6 any more, then the heat dissipation sleeve 6 is inserted into the slot 4 of the body 1, the heat dissipation sheet 7 is aligned with the heat dissipation groove 5 on the inner peripheral wall of the slot 4, then the heat dissipation sheet 7 is pushed into the heat dissipation groove 5, so that the heat dissipation sheet 7 is clamped into the heat dissipation groove 5, the heat dissipation sheet 7 is limited by the heat dissipation groove 5, the heat dissipation sleeve 6 is limited by the heat dissipation sheet 7, so that the heat dissipation sleeve 6 is not easy to pull out of the slot 4, then the oil storage block 8 is arranged in the heat dissipation sleeve 6, the heat dissipation sheet 7 is not easy to slide by the limit of the oil storage block 8 to the heat dissipation sheet 7, namely, the installation operation, the heat is easy to dissipate, the plastic gear is prevented from generating thermal deformation, and the service life of the plastic gear is prolonged.

Because be provided with the external screw thread structure on the 8 top periphery walls of oil storage piece, set up on the internal perisporium in 6 tops of heat dissipation cover with external screw thread structure assorted internal thread structure, when installation oil storage piece 8, with oil storage piece 8 in through external screw thread structure screw in heat dissipation cover 6, realized the connection dismantled of oil storage piece 8 in heat dissipation cover 6 to threaded connection has the characteristics that connection convenient operation is swift, makes oil storage piece 8 can stabilize and in the convenient mounting groove heat dissipation cover 6.

Because the sponge block 10 is arranged in the containing cavity 9 of the radiating fin 7, and the oil storage cavity 14 is arranged in the oil storage block 8, when in use, lubricating oil can enter the oil storage cavity 14 and be stored by injecting the lubricating oil into the oil filling hole 17 of the sealing cover 16, the lubricating oil can not flow into the oil guide groove 15 by the sealing effect of the sealing element on the oil guide groove 15, when the meshing part of the tooth block 2 needs to be lubricated, the sealing cover 16 is rotated to separate the sealing element from the oil guide groove 15, so that the lubricating oil can flow into the oil guide groove 15 under the action of gravity, and finally flow into the containing cavity 9 through the oil guide groove 15, the oil through hole 13 and the oil inlet hole 12 and be absorbed by the sponge block 10, because the oil outlet 11 is arranged on the side wall of the tooth block 2, after the sponge block 10 absorbs the lubricating oil, the lubricating oil can gradually overflow the oil outlet 11 to lubricate the inner wall of the tooth socket 3, thereby reducing the friction force between the tooth blocks 2, thereby reducing the frictional heat and further prolonging the service life of the body 1.

Because the sealing member includes sealing pin 18 of sliding connection on closing cap 16, and sealing pin 18 bottom is provided with and is hemispherical plug 19, make when lubricating oil is poured into to needs, rotate closing cap 16, make sealing pin 18 rotate along with it, because plug 19 is hemispherical, make plug 19 atress upwards slide gradually and make sealing pin 18 protrusion closing cap 16 surface, be about to store up oil chamber 14 and lead oil groove 15 and switch on, and be convenient for observe the conducting state, after need not pouring into lubricating oil, rotate closing cap 16 once more, make sealing pin 18 rotate along with it and make plug 19 block in leading oil groove 15, the sealed operation of leading oil groove 15 has been accomplished promptly, and convenient operation is swift, time saving and labor saving.

Because 18 periphery wall both sides of seal pin all are provided with slider 21, the spout 22 that is used for slider 21 card to go into is all offered to 20 internal periphery wall both sides of draw-in groove, slides in spout 22 through slider 21, has realized the sliding connection of seal pin 18 in draw-in groove 20 to spacing through spout 22 to slider 21, make seal pin 18 only can carry out axial motion in draw-in groove 20, the slip process is more stable smooth and easy.

Because be provided with pressure spring 23 between the roof in slider 21 and the spout 22, thereby make when rotating closing cap 16, slider 21 upwards slides in spout 22 thereupon, thereby make pressure spring 23 atress compression and produce the elasticity of reconversion, continuing to rotate closing cap 16, make plug 19 aim at and lead behind oil groove 15, thereby because pressure spring 23 no longer receives the extrusion reconversion, and make slider 21 drive seal pin 18 to popping out to the direction of keeping away from pressure spring 23, thereby make plug 19 card go into in leading oil groove 15, and make plug 19 be difficult for breaking away from leading oil groove 15, sealed effect is better.

Because the connecting ribs 24 are arranged on the top surface of the sealing cover 16, the connecting ribs 24 are arranged to provide force application points for the operation of rotating the sealing cover 16, so that a worker can drive the sealing cover 16 to rotate by holding the connecting ribs 24 and rotating, and the operation is more convenient and labor-saving.

Because the transversal isosceles trapezoid of oil filler point 17 for lubricating oil in the oil storage chamber 14 is difficult for flowing out from oil filler point 17, and is provided with sealing plug 25 in the oil filler point 17, through sealing plug 25 to oil filler point 17, makes lubricating oil be difficult for leaking more.

Because the top surface sliding connection of oil storage piece 8 has bolt 26, has seted up caulking groove 27 on the closing cap 16, when need not use closing cap 16, promote bolt 26 and make bolt 26 block in caulking groove 27, through bolt 26 to closing cap 16 spacing, make closing cap 16 difficult emergence rotate to make seal pin 18 difficult slip lead to leading oil groove 15 to open, thereby make the storage of lubricating oil more safe and stable.

By adding tungsten boride, nanocarbon sol and graphite fluoride into the ingredients, the friction coefficient of polyformaldehyde resin is improved, and the friction resistance is reduced, so that the gear is less prone to frictional heat deformation, the crystallinity of polyformaldehyde can be improved by the aid of the titanium chalks and the mica powder, and the wear resistance and hardness of the body 1 are improved.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A novel plastic gear is characterized in that: including body (1), be provided with a plurality of tooth pieces (2) along the circumferencial direction on body (1) periphery wall, it is adjacent be formed with tooth's socket (3) between tooth piece (2), slot (4) have been seted up on body (1), a plurality of radiating grooves (5) have been seted up along the circumferencial direction on slot (4) internal perisporium, radiating groove (5) extend to tooth piece (2) inside along the direction of keeping away from body (1) axis, slot (4) inside is provided with heat dissipation cover (6), have a plurality of fin (7) that are used for the card to go into radiating groove (5) along radial sliding connection on heat dissipation cover (6) periphery wall, heat dissipation cover (6) inside detachably is connected with and is used for conflicting fin (7) in order to restrict gliding oil storage piece (8) of fin (7).

2. The novel plastic gear according to claim 1, wherein: the oil storage block (8) top periphery wall is provided with the external screw thread structure, set up on the internal perisporium in heat dissipation cover (6) top with external screw thread structure assorted internal thread structure.

3. The novel plastic gear according to claim 1, wherein: two sides of the middle end of the radiating fin (7) are bent towards opposite directions and form an accommodating cavity (9), a sponge block (10) is arranged in the containing cavity (9), an oil outlet (11) communicated with the heat dissipation groove (5) is arranged on the side wall of the tooth block (2), the inner peripheral wall of the heat dissipation sleeve (6) is provided with a plurality of oil inlet holes (12) communicated with the containing cavity (9), a plurality of oil through holes (13) are arranged on the outer peripheral wall of the oil storage block (8) in an array manner along the circumferential direction, an oil storage cavity (14) is formed in the top of the oil storage block (8), a plurality of oil guide grooves (15) communicated with the oil through holes (13) are formed in the inner bottom wall of the oil storage cavity (14), a sealing cover (16) is rotatably connected inside the top end of the oil storage cavity (14), a plurality of sealing pieces for sealing the oil guide groove (15) are arranged on the sealing cover (16), an oil filling hole (17) communicated with the oil storage cavity (14) is formed in the sealing cover (16).

4. A novel plastic gear according to claim 3, wherein: the sealing member includes sealing pin (18) of sliding connection on closing cap (16), sealing pin (18) bottom is provided with plug (19) that are used for the card to go into oil guide groove (15), plug (19) are hemispherical.

5. The novel plastic gear according to claim 4, wherein: offer a plurality of draw-in grooves (20) that are used for seal pin (18) card to go into on closing cap (16), seal pin (18) periphery wall both sides all are provided with slider (21), spout (22) that are used for slider (21) card to go into are all offered to draw-in groove (20) internal perisporium both sides.

6. The novel plastic gear according to claim 5, wherein: a pressure spring (23) is arranged between the slide block (21) and the inner top wall of the sliding groove (22).

7. A novel plastic gear according to claim 3, wherein: and a plurality of connecting ribs (24) are arranged on the top surface of the sealing cover (16) in an array along the circumferential direction.

8. A novel plastic gear according to claim 3, wherein: the cross section of oil filler point (17) is isosceles trapezoid and little head end is towards oil storage chamber (14), inside detachably of oil filler point (17) is connected with sealing plug (25) made by rubber materials.

9. A novel plastic gear according to claim 3, wherein: the top surface of the oil storage block (8) is connected with a bolt (26) in a sliding mode along the radial direction, and the top surface of the sealing cover (16) is provided with a caulking groove (27) for the bolt (26) to be clamped in.

10. The novel plastic gear according to claim 1, wherein: the body (1) is prepared from the following raw materials, by weight, 95 parts of polyformaldehyde resin, 15 parts of nanocarbon sol, 11 parts of graphite fluoride, 8 parts of tungsten boride, 13 parts of thermoplastic polyurethane elastomer, 4 parts of maleic anhydride grafted polyethylene, 5 parts of titanosilicate powder, 7 parts of aluminum-zirconium coupling agent, 3 parts of mica powder and 2 parts of magnesium naphthenate.