Worm of automobile electric power steering gear

Abstract

The utility model relates to the technical field of electric power steering systems, in particular to an automobile electric power steering gear worm which comprises a shell, a driving motor is fixedly installed on the inner wall of one side of the shell, the output end of the driving motor is fixedly connected with a worm through a coupler, and a fixing disc is fixedly installed on the other side of the inner wall of the shell. The end, away from the driving motor, of the worm is rotationally connected into the fixing disc, the worm is meshed with a worm gear, a limiting groove is formed in the inner wall of the side, close to the worm gear, of the shell, and a lubricating assembly used for lubricating the worm gear and the worm is slidably connected into the limiting groove. According to the device, by arranging the lubricating assembly and the reciprocating moving assembly, when the device is used, a connecting block can be driven to slide on a sliding groove through a first connecting rod and a second connecting rod by starting the device during use, the whole worm is lubricated, and by arranging an inclined oil injection pipe, the spraying direction of an oil outlet can be always aligned with the meshing position of the worm and a worm wheel; and the lubricating oil is sprayed more accurately.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power steering systems, in particular to a worm gear of an automobile electric power steering device. Background Art

[0002] The electric power steering worm is a key transmission component in the electronic power steering system. It works together with the worm wheel and other components to achieve the function of power steering. The power steering provides steering assistance through the motor. The control unit determines the auxiliary torque to be output according to the vehicle speed and the force applied by the driver on the steering wheel, so as to achieve the lightness of low-speed steering and the stability of high-speed steering.

[0003] However, when the car is driving, the lubricating grease on the worm gear is easy to drip into the housing due to inertia, or be thrown to various positions in the housing when the worm gear rotates at high speed. Long-term large-scale accumulation can easily affect use and is inconvenient to clean. After long-term operation, the meshing parts of the worm gear will suffer varying degrees of wear due to lack of grease lubrication.

[0004] For example, the publication number "CN216034632U" provides an electric power steering device for new energy vehicles. The device can control the friction between the friction plate and the friction plate within a certain range by setting an electric telescopic rod, which can not only ensure the locking of the worm gear, but also make the generated resistance softer, avoiding the problem of increased costs due to the need to quickly unlock the worm gear.

[0005] However, the above device still has the following problems during implementation:

[0006] When the device is in use, it is inconvenient to lubricate the meshing parts of the worm gear. When in use, the meshing parts of the worm gear will suffer varying degrees of wear due to the lack of grease lubrication, resulting in an increase in the gap between the worm gear and the worm gear. Abnormal noises are likely to occur during use, and long-term use can easily cause damage to the worm gear, resulting in reduced vehicle safety. Utility Model Content

[0007] The utility model aims to provide a worm gear of an automobile electric power steering device to solve the problems raised in the above-mentioned background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A worm gear of an automobile electric power steering device comprises a housing, a driving motor is fixedly mounted on the inner wall of one side of the housing, an output end of the driving motor is fixedly connected to a worm gear through a coupling, a fixing plate is fixedly mounted on the other side of the inner wall of the housing, an end of the worm gear away from the driving motor is rotatably connected to the fixing plate, a worm gear is meshed on the worm gear, a limiting groove is provided on the inner wall of the housing gear close to the worm gear, a lubrication assembly for lubricating the worm gear and the worm gear is slidably connected inside the limiting groove;

[0010] An oil storage tank is fixedly installed at the bottom of the inner wall of the shell, and the oil storage tank is arranged directly below the drive motor. A refueling pipe is connected to the lubrication component, and the other end of the refueling pipe is connected to the liquid outlet end of the oil storage tank.

[0011] Preferably: the lubrication assembly includes a sliding block, the sliding block is slidably connected in the limit groove, an oil filling pipe is fixedly installed on the side of the sliding block close to the worm gear, an oil outlet is provided on the side of the oil filling pipe close to the worm gear, the oil filling pipe is fixedly installed on the bottom of the sliding block, and the oil filling pipe is connected to the sliding block and the oil filling pipe, and a reciprocating moving assembly is also provided on the side of the sliding block away from the oil filling pipe.

[0012] Preferably: the reciprocating moving component includes a connecting block, a sliding groove for the connecting block to slide is provided in the inner wall of the shell, a connecting groove is provided on the limiting groove, the connecting groove is connected with the sliding groove, and the connecting block is fixed to the sliding block in the limiting groove through the connecting groove.

[0013] Preferably: a servo motor is fixedly installed on the top of the connecting block, an output end of the servo motor is fixedly connected to a first rotating gear through a coupling, a side of the connecting block close to the first rotating gear is rotatably connected to a second rotating gear, and the second rotating gear is meshed with the first rotating gear;

[0014] A first connecting rod is fixedly installed on the side of the second rotating gear away from the connecting block, and the other end of the first connecting rod is rotatably connected to the second connecting rod via a rotating shaft. A fixed block is also fixedly installed in the inner wall of the shell, and the center of the fixed block and the sliding groove are located on the same axis, and the other end of the second connecting rod is rotatably connected to the fixed block via a rotating shaft.

[0015] Preferably: a collecting box is further provided at the bottom of the inner wall of the shell, the worm is located in the collecting box, and both ends of the worm pass through both sides of the collecting box, and the side of the collecting box close to the oil storage tank is connected to the oil storage tank through an infusion pipe.

[0016] Preferably: an oil outlet pump is arranged at the bottom of the inner wall of the oil storage tank, an end of the oil filling pipe away from the sliding block penetrates the surface of the oil storage tank and extends to the inside of the oil storage tank, and the extended end of the oil filling pipe is fixed to the oil outlet pump;

[0017] A connecting port is provided on one side of the oil storage tank close to the collecting tank, and the connecting port is connected to the infusion pipe on the collecting tank. An oil inlet is provided on the top of the oil storage tank, and a liquid level sensor is also provided in the inner wall of the oil storage tank.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model provides a lubricating component and a reciprocating moving component. When in use, the connecting block can be driven to slide on the sliding groove by starting the first connecting rod and the second connecting rod. The connecting block drives the sliding block to slide synchronously through the connecting groove, thereby lubricating the entire worm and reducing wear during use. By providing an inclined oil filling pipe, the spraying direction of the oil outlet can always be aligned with the meshing position of the worm and the worm wheel, so that the lubricating oil can be sprayed more accurately and waste can be reduced.

[0020] 2. The utility model has a collecting box at the bottom of the worm, so that the lubricating oil leaked from the worm can be collected when in use. The worm is arranged in the collecting box, so that the worm can be prevented from throwing the lubricating oil to other parts of the housing when rotating. After a certain amount of lubricating oil is collected in the collecting box, the infusion tube on the collecting box is opened, and the lubricating oil collected in the collecting box can be transported to the oil storage tank through the infusion tube for reuse, thereby reducing waste. At the same time, the remaining lubricating oil in the oil storage tank can be monitored by the arranged liquid level sensor. When the remaining lubricating oil is low, a reminder can be given through the liquid level sensor, and the oil can be replenished in time through the oil inlet at the top of the oil storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the first perspective of the present utility model;

[0022] Figure 2 It is a schematic diagram of the second viewing angle of the present utility model;

[0023] Figure 3 It is a structural schematic diagram of the lubrication component in the utility model;

[0024] Figure 4 It is a structural schematic diagram of the reciprocating moving component in the utility model;

[0025] Figure 5 It is a schematic diagram of the internal structure of the oil storage tank in the utility model.

[0026] In the figure: 1. housing; 11. driving motor; 12. worm; 13. fixed plate; 14. worm wheel; 15. limiting groove; 16. sliding groove; 17. connecting groove; 2. oil storage tank; 21. oil pump; 22. connecting port; 23. liquid level sensor; 24. oil inlet; 3. lubrication assembly; 31. sliding block; 32. oil filling pipe; 33. oil outlet; 34. oil filling pipe; 4. reciprocating assembly; 41. connecting block; 42. servo motor; 43. first rotating gear; 44. second rotating gear; 45. first connecting rod; 46. second connecting rod; 47. fixed block; 5. collecting box. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] For example, see Figure 1-5 A worm gear of an automobile electric power steering device comprises a housing 1, a driving motor 11 is fixedly mounted on the inner wall of one side of the housing 1, a worm 12 is fixedly connected to the output end of the driving motor 11 through a coupling, a fixing plate 13 is fixedly mounted on the other side of the inner wall of the housing 1, one end of the worm 12 away from the driving motor 11 is rotatably connected to the fixing plate 13, a worm wheel 14 is meshed on the worm 12, a limiting groove 15 is provided on the inner wall of the housing 1 close to the worm wheel 14, a lubrication assembly 3 for lubricating the worm wheel 14 and the worm 12 is slidably connected inside the limiting groove 15, an oil storage tank 2 is fixedly mounted on the bottom of the inner wall of the housing 1, the oil storage tank 2 is arranged just below the driving motor 11, a refueling pipe 34 is connected to the lubrication assembly 3, and the other end of the refueling pipe 34 is connected to the liquid outlet end of the oil storage tank 2;

[0029] When in use, the worm 12 is driven to rotate by starting the drive motor 11. When the worm 12 rotates, the worm wheel 14 is also driven to rotate to assist the steering of the vehicle. When the worm 12 and the worm wheel 14 need to be lubricated, the filling pipe 34 is opened to allow the lubricating oil in the oil storage tank 2 to flow out through the filling pipe 34 to lubricate the worm 12 and the worm wheel 14. The length of the limiting groove 15 is the same as the length of the worm 12. When in use, the lubricating component 3 can slide back and forth on the limiting groove 15, so that the lubricating component 3 can evenly lubricate various parts of the worm 12, thereby reducing the wear of the worm 12 during use.

[0030] For example 2, please refer to Figure 1-5The lubrication assembly 3 includes a sliding block 31, which is slidably connected to the limiting groove 15. An oil filling pipe 32 is fixedly installed on the side of the sliding block 31 close to the worm gear 14. An oil outlet 33 is provided on the side of the oil filling pipe 32 close to the worm gear 14. A refueling pipe 34 is fixedly installed at the bottom of the sliding block 31, and the refueling pipe 34 is connected to the sliding block 31 and the oil filling pipe 32. A reciprocating assembly 4 is also provided on the side of the sliding block 31 away from the oil filling pipe 32. The reciprocating assembly 4 includes a connecting block 41. A sliding groove 16 for sliding the connecting block 41 is also provided in the inner wall of the housing 1. A connecting groove 17 is also provided on the limiting groove 15. The connecting groove 17 is connected to the sliding groove 16. The connecting block 41 is connected to the limiting groove 15 through the connecting groove 17. The sliding block 31 inside is fixed, a servo motor 42 is fixedly installed on the top of the connecting block 41, the output end of the servo motor 42 is fixedly connected to the first rotating gear 43 through a coupling, the side of the connecting block 41 close to the first rotating gear 43 is rotatably connected to the second rotating gear 44, and the second rotating gear 44 is meshed with the first rotating gear 43, and the side of the second rotating gear 44 away from the connecting block 41 is fixedly installed with a first connecting rod 45, and the other end of the first connecting rod 45 is rotatably connected to the second connecting rod 46 through a rotating shaft, and a fixed block 47 is also fixedly installed in the inner wall of the housing 1, and the fixed block 47 and the center of the sliding groove 16 are located on the same axis, and the other end of the second connecting rod 46 is rotatably connected to the fixed block 47 through a rotating shaft;

[0031] When lubricating, the servo motor 42 on the connecting block 41 is started, so that the servo motor 42 drives the first rotating gear 43 to rotate, and at the same time, the second rotating gear 44 meshing with the first rotating gear 43 is rotated. When the second rotating gear 44 rotates, the first connecting rod 45 on the second rotating gear 44 rotates synchronously with the second rotating gear 44. The first connecting rod 45 drives the connecting block 41 to slide back and forth on the sliding groove 16 under the limitation of the second connecting rod 46, so that the connecting block 41 drives the sliding block 31 to move back and forth;

[0032] At the same time, the oil filling pipe 34 is opened, so that the lubricating oil enters the sliding block 31 and the oil filling pipe 32 through the oil filling pipe 34, and is sprayed on the worm 12 and the worm wheel 14 through the oil outlet 33 to lubricate the meshing part of the worm 12 and the worm wheel 14;

[0033] Through the reciprocating assembly 4, the first connecting rod 45 and the second connecting rod 46 can drive the connecting block 41 to slide on the sliding groove 16 during use, and the connecting block 41 drives the sliding block 31 to slide synchronously through the connecting groove 17, thereby lubricating the entire worm 12;

[0034] By providing the inclined oil filling pipe 32, the spraying direction of the oil outlet 33 can be always aligned with the meshing position of the worm 12 and the worm wheel 14, so that the lubricating oil can be sprayed more accurately and waste can be reduced.

[0035] For example 3, please refer to Figure 1 , Figure 2 and Figure 5 A collecting box 5 is also provided at the bottom of the inner wall of the shell 1, and the worm 12 is located in the collecting box 5, and both ends of the worm 12 pass through the two sides of the collecting box 5. The side of the collecting box 5 close to the oil storage tank 2 is connected with the oil storage tank 2 through a liquid infusion pipe. An oil outlet pump 21 is provided at the bottom of the inner wall of the oil storage tank 2. One end of the refueling pipe 34 away from the sliding block 31 passes through the surface of the oil storage tank 2 and extends to the inside of the oil storage tank 2. The extended end of the refueling pipe 34 is fixed to the oil outlet pump 21. A connecting port 22 is provided on the side of the oil storage tank 2 close to the collecting box 5. The connecting port 22 is connected with the liquid infusion pipe on the collecting box 5. An oil inlet 24 is provided on the top of the oil storage tank 2, and a liquid level sensor 23 is also provided in the inner wall of the oil storage tank 2.

[0036] When in use, the oil pump 21 in the oil storage tank 2 is started, so that the oil pump 21 delivers the lubricating oil in the oil storage tank 2 to the filling pipe 34 and sprays it out through the oil outlet 33 to lubricate the worm 12 and the worm wheel 14. The lubricating oil leaking from the worm 12 can be collected by the collecting box 5 arranged at the bottom of the worm 12. The worm 12 is arranged in the collecting box 5, so that the worm 12 can be prevented from throwing the lubricating oil to other parts of the housing 1 when rotating.

[0037] When a certain amount of lubricating oil is collected in the collecting box 5, the infusion tube on the collecting box 5 is opened, and the lubricating oil collected in the collecting box 5 can be transported to the oil storage tank 2 through the infusion tube for reuse, thereby reducing waste during lubrication;

[0038] By means of a liquid level sensor 23 arranged inside the oil storage tank 2, the remaining lubricating oil in the oil storage tank 2 can be monitored through the liquid level sensor 23 during use. When the remaining lubricating oil is low, a reminder can be given through the liquid level sensor 23, and the oil can be replenished in time through the oil inlet 24 at the top of the oil storage tank 2.

[0039] Working principle: When in use, the worm 12 is driven to rotate by starting the driving motor 11. When the worm 12 rotates, the worm wheel 14 is driven to rotate at the same time, so as to assist the steering of the vehicle. When the worm 12 and the worm wheel 14 need to be lubricated, the servo motor 42 on the connecting block 41 is started, so that the servo motor 42 drives the first rotating gear 43 to rotate, and at the same time, the second rotating gear 44 meshing with the first rotating gear 43 is rotated. When the second rotating gear 44 rotates, the first connecting rod 45 on the second rotating gear 44 rotates synchronously with the second rotating gear 44. The first connecting rod 45 drives the connecting block 41 to slide back and forth on the sliding groove 16 under the limitation of the second connecting rod 46, so that the connecting block 41 drives the sliding block 31 to move back and forth;

[0040] The oil pump 21 in the oil storage tank 2 is started, so that the oil pump 21 delivers the lubricating oil in the oil storage tank 2 to the filling pipe 34, so that the lubricating oil enters the sliding block 31 and the oil filling pipe 32 through the filling pipe 34, and is sprayed on the worm 12 and the worm wheel 14 through the oil outlet 33, so as to lubricate the meshing part of the worm 12 and the worm wheel 14;

[0041] By setting the collecting box 5 at the bottom of the worm 12, the lubricating oil leaking from the worm 12 can be collected during use. By setting the worm 12 in the collecting box 5, it can be prevented that the worm 12 throws the lubricating oil to other parts of the shell 1 when rotating. After a certain amount of lubricating oil is collected in the collecting box 5, the infusion tube on the collecting box 5 is opened, and the lubricating oil collected in the collecting box 5 can be transported to the oil storage tank 2 through the infusion tube for reuse, thereby reducing waste.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A worm gear for an electric power steering device of an automobile, comprising a housing (1), characterized in that: A driving motor (11) is fixedly mounted on the inner wall of one side of the housing (1); an output end of the driving motor (11) is fixedly connected to a worm (12) via a coupling; a fixing plate (13) is fixedly mounted on the other side of the inner wall of the housing (1); an end of the worm (12) away from the driving motor (11) is rotatably connected to the fixing plate (13); a worm wheel (14) is meshed on the worm (12); a limiting groove (15) is provided on the inner wall of the housing (1) on a side close to the worm wheel (14); a lubrication component (3) for lubricating the worm wheel (14) and the worm (12) is slidably connected inside the limiting groove (15); An oil storage tank (2) is fixedly mounted at the bottom of the inner wall of the housing (1), and the oil storage tank (2) is arranged directly below the drive motor (11). A refueling pipe (34) is connected to the lubrication assembly (3), and the other end of the refueling pipe (34) is connected to the liquid outlet end of the oil storage tank (2).

2. The worm gear of an automotive electric power steering device according to claim 1, characterized in that: The lubrication assembly (3) comprises a sliding block (31), the sliding block (31) being slidably connected in a limiting groove (15), an oil filling pipe (32) being fixedly installed on a side of the sliding block (31) close to the worm gear (14), an oil outlet (33) being provided on a side of the oil filling pipe (32) close to the worm gear (14), an oil filling pipe (34) being fixedly installed at the bottom of the sliding block (31), and the oil filling pipe (34) being connected to the sliding block (31) and the oil filling pipe (32), and a reciprocating moving assembly (4) being further provided on a side of the sliding block (31) away from the oil filling pipe (32).

3. The worm gear of an automotive electric power steering device according to claim 2, characterized in that: The reciprocating moving assembly (4) comprises a connecting block (41), a sliding groove (16) for the connecting block (41) to slide is provided in the inner wall of the housing (1), a connecting groove (17) is provided on the limiting groove (15), the connecting groove (17) is connected to the sliding groove (16), and the connecting block (41) is fixed to the sliding block (31) in the limiting groove (15) via the connecting groove (17).

4. The worm gear of an automotive electric power steering device according to claim 3, characterized in that: A servo motor (42) is fixedly mounted on the top of the connection block (41); an output end of the servo motor (42) is fixedly connected to a first rotating gear (43) via a coupling; a second rotating gear (44) is rotatably connected to a side of the connection block (41) close to the first rotating gear (43), and the second rotating gear (44) is meshed with the first rotating gear (43); A first connecting rod (45) is fixedly installed on the side of the second rotating gear (44) away from the connecting block (41), and the other end of the first connecting rod (45) is rotationally connected to the second connecting rod (46) via a rotating shaft. A fixed block (47) is also fixedly installed in the inner wall of the shell (1), and the center of the fixed block (47) and the sliding groove (16) are located on the same axis, and the other end of the second connecting rod (46) is rotationally connected to the fixed block (47) via a rotating shaft.

5. The worm gear of an automotive electric power steering device according to claim 1, characterized in that: A collecting box (5) is also provided at the bottom of the inner wall of the housing (1), the worm (12) is located in the collecting box (5), and both ends of the worm (12) penetrate through both sides of the collecting box (5), and the side of the collecting box (5) close to the oil storage tank (2) is connected to the oil storage tank (2) through a liquid infusion pipe.

6. The worm gear of an automotive electric power steering device according to claim 1, characterized in that: An oil delivery pump (21) is arranged at the bottom of the inner wall of the oil storage tank (2); an end of the oil filling pipe (34) away from the sliding block (31) penetrates the surface of the oil storage tank (2) and extends to the inside of the oil storage tank (2); and the extended end of the oil filling pipe (34) is fixed to the oil delivery pump (21); A connecting port (22) is provided on a side of the oil storage tank (2) close to the collecting tank (5), and the connecting port (22) is connected to a liquid infusion pipe on the collecting tank (5). An oil inlet (24) is provided on the top of the oil storage tank (2), and a liquid level sensor (23) is also provided in the inner wall of the oil storage tank (2).

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