Gear backlash eliminating device

Abstract

The utility model belongs to the technical field of automobile transmission, and particularly relates to a gear backlash eliminating device which comprises a rotating shaft, a main gear, a pre-tightening gear, a guide assembly, a hydraulic driver and a reset spring. The guide assembly comprises a guide inner ring and a guide outer ring, a spiral convex block is formed on the outer circumferential wall of the guide inner ring, and a spiral groove is formed in the inner circumferential wall of the guide outer ring; the hydraulic driver is used for pushing the guide outer ring; the reset spring is used for pushing the pre-tightening gear. When oil is supplied to the backlash eliminating device, the hydraulic driver pushes the pre-tightening gear through the guide outer ring, the pre-tightening gear overcomes the thrust of the reset spring to be away from the main gear, the pre-tightening gear is guided by the limiting protruding block and the spiral groove to move in the axial direction and rotate in the circumferential direction to be meshed with the transmission gear, pre-tightening force is generated by the pre-tightening gear and the transmission gear, and the backlash eliminating device supplies oil to the transmission gear. Therefore, the meshing backlash is eliminated; and when the backlash eliminating device cancels oil supply, the reset spring pushes the pre-tightening gear to reset so as to meet different working condition requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile transmission, in particular to a gear side clearance eliminating device. Background Art

[0002] Gear transmission is a common mechanical transmission method, which is widely used in vehicle transmission systems. There is meshing backlash in the gear transmission mechanism, which is an important technical parameter to ensure the normal operation of the gear and extend its service life. If the backlash is too small, the gear will be stuck due to deformation caused by temperature rise or axis deflection; if the backlash is too large, the gear will shake greatly when the rotation stops or reverses.

[0003] Due to the complex working conditions in the vehicle's transmission system, some working conditions require retaining the meshing side clearance to ensure the transmission effect, while some working conditions require eliminating the meshing side clearance to improve NVH (noise, vibration and harshness) problems. Utility Model Content

[0004] Based on this, the utility model provides a gear side clearance elimination device, which can retain and eliminate meshing side clearance to meet different working conditions.

[0005] The embodiment of the utility model provides a gear backlash elimination device, comprising:

[0006] Rotating shaft;

[0007] A main gear, fixedly connected to the rotating shaft;

[0008] A pre-tightening gear is movably sleeved on the rotating shaft through a shaft sleeve;

[0009] The guide assembly comprises an inner guide ring and an outer guide ring, wherein the inner guide ring is synchronously rotatably connected to the rotating shaft, the outer guide ring is synchronously rotatably connected to the preload gear, and the outer guide ring is movably sleeved on the inner guide ring; a spiral protrusion is formed on the outer peripheral wall of the inner guide ring, and a spiral groove for accommodating the spiral protrusion is correspondingly formed on the inner peripheral wall of the outer guide ring;

[0010] A hydraulic driver is arranged on the end surface of the main gear facing the pre-tightening gear, and the hydraulic driver is used to push the guide outer ring so that the guide outer ring drives the pre-tightening gear away from the main gear;

[0011] A return spring is arranged on a side of the pre-tightening gear away from the main gear, and is used for pushing the pre-tightening gear to approach the main gear.

[0012] In some embodiments, the inner circumferential wall of the guide inner ring is provided with a first internal spline, the rotating shaft is provided with a first external spline meshing with the first internal spline, one end of the guide inner ring abuts against the main gear, and the other end abuts against the sleeve.

[0013] In some embodiments, the first internal splines and the first external splines are involute splines.

[0014] In some embodiments, the pre-tightening gear is provided with a second internal spline on the end surface facing the main gear, and the outer peripheral wall of the guide outer ring is provided with a second external spline meshing with the second internal spline.

[0015] In some embodiments, the second internal splines and the second external splines are rectangular splines.

[0016] In some embodiments, the hydraulic driver is an annular hydraulic cylinder, an annular groove is provided on the end surface of the main gear facing the pre-tightening gear, and the annular hydraulic cylinder is embedded in the annular groove.

[0017] In some embodiments, a first sealing ring is provided between the outer peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove, and a second sealing ring is provided between the inner peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove.

[0018] In some embodiments, the return spring is sleeved on the sleeve, and a convex ring is formed at one end of the sleeve away from the main gear. One end of the return spring abuts against the end surface of the preload gear away from the main gear, and the other end abuts against the convex ring.

[0019] In some embodiments, the side clearance elimination device further includes a hydraulic oil circuit, which includes a first oil passage, a second oil passage, an oil distribution ring, and a third oil passage connected in sequence;

[0020] The first oil passage enters the interior of the rotating shaft from the end face of the rotating shaft away from the main gear; the second oil passage penetrates from the first oil passage to the outer peripheral wall of the rotating shaft, and the oil outlet end of the second oil passage is located on the side of the main gear away from the preload gear; the third oil passage penetrates from the end face of the main gear away from the preload gear to the other end face to connect with the hydraulic driver; the oil distribution ring is attached to the end face of the main gear away from the preload gear to connect the second oil passage and the third oil passage.

[0021] In some embodiments, a third sealing ring is provided between the oil distribution ring and the main gear.

[0022] When the side clearance eliminating device of the utility model supplies oil, the hydraulic driver pushes the pre-tightening gear through the guide outer ring, and the pre-tightening gear overcomes the thrust of the reset spring and moves away from the main gear, so that the pre-tightening gear moves axially and rotates circumferentially under the guidance of the limit protrusion and the spiral groove until it meshes with the transmission gear. The pre-tightening gear and the transmission gear generate a pre-tightening force, thereby eliminating the meshing side clearance; when the side clearance eliminating device cancels the oil supply, the reset spring pushes the pre-tightening gear to reset, so as to meet the requirements of different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic cross-sectional structure diagram of the gear backlash elimination device of this embodiment;

[0024] Figure 2 It is a structural schematic diagram of the rotating shaft and the main gear;

[0025] Figure 3 It is a structural schematic diagram of the preloaded gear;

[0026] Figure 4 The schematic diagram of the structure of the guiding inner ring;

[0027] Figure 5 Schematic diagram of the structure of the guide outer ring.

[0028] In the figure: shaft 10; first external spline 11; main gear 20; annular groove 21; preload gear 30; second internal spline 31; guide inner ring 40; first internal spline 41; spiral convex block 42; guide outer ring 50; spiral groove 51; second external spline 52; hydraulic driver 60; return spring 70; bushing 80; convex ring 81; first oil passage 90; second oil passage 91; oil distribution ring 92; third oil passage 93; first sealing ring 94; second sealing ring 95; third sealing ring 96. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0031] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] like Figure 1 As shown, this embodiment provides a gear backlash elimination device, which includes a rotating shaft 10, a main gear 20, a pre-tightening gear 30, a guide assembly, a hydraulic driver 60 and a return spring 70.

[0033] In this embodiment, bearings are provided at both ends of the rotating shaft 10 so that the rotating shaft 10 can rotate. Figure 2 The main gear 20 is fixedly connected to the rotating shaft 10 and can rotate synchronously with the rotating shaft 10. The main gear 20 of this embodiment is preferably formed integrally with the rotating shaft 10, which not only ensures the structural strength of the main gear 20 and the rotating shaft 10, but also saves the assembly process of the rotating shaft 10 and the main gear 20.

[0034] See Figure 3 The preload gear 30 of this embodiment is movably mounted on the rotating shaft 10 through the shaft sleeve 80. It should be noted that the preload gear 30 of this embodiment is movably connected to the rotating shaft 10, which specifically means that the preload gear 30 can move axially and rotate circumferentially relative to the rotating shaft 10.

[0035] See Figure 4 and Figure 5 The guide assembly of this embodiment preferably includes a guide inner ring 40 and a guide outer ring 50. The guide inner ring 40 can be synchronously rotated to connect the rotating shaft 10, and the guide outer ring 50 can be movably sleeved on the guide inner ring 40. Preferably, a first internal spline 41 is provided on the inner circumferential wall of the guide inner ring 40, and an external spline engaged with the first internal spline 41 is provided on the rotating shaft 10. The rotating shaft 10 and the guide inner ring 40 transmit torque through the first spline assembly. One end of the guide inner ring 40 abuts against the main gear 20, and the other end abuts against the shaft sleeve 80, which facilitates the assembly of the guide inner ring 40 onto the rotating shaft 10.

[0036] The first inner spline 41 and the first outer spline 11 of this embodiment are preferably involute splines, which have strong load-bearing capacity, are easy to automatically center, and have high installation precision. It should be noted that the guide outer ring 50 can be movably connected to the guide inner ring 40, which specifically means that the guide outer ring 50 can move axially and rotate circumferentially relative to the guide inner ring 40. The connection method for the guide inner ring 40 to rotate synchronously with the rotating shaft 10 can be selected from other existing technologies, which will not be described in detail in this embodiment.

[0037] In this embodiment, a spiral protrusion 42 is formed on the outer circumferential wall of the guide inner ring 40, and a spiral groove 51 is formed on the inner circumferential wall of the guide outer ring 50, and the spiral groove 51 is used to accommodate the relatively movable spiral protrusion 42. The guide outer ring 50 is sleeved on the guide inner ring 40, and the spiral protrusion 42 is movably arranged in the spiral groove 51. When the guide outer ring 50 and the guide inner ring 40 move relative to each other, the guide outer ring 50 can move axially relative to the guide inner ring 40 on the one hand, and can rotate circumferentially relative to the guide inner ring 40 under the action of the spiral groove 51 and the spiral protrusion 42 on the other hand.

[0038] The guide outer ring 50 of this embodiment can be synchronously rotated with the pre-tightening gear 30. Preferably, the end surface of the pre-tightening gear 30 facing the main gear 20 is provided with a second internal spline 31, and the outer peripheral wall of the guide outer ring 50 is provided with a second external spline 52 meshing with the first external spline 11, and the guide outer ring 50 and the pre-tightening gear 30 transmit torque through the second spline assembly. The second internal spline 31 and the second external spline 52 of this embodiment are preferably rectangular splines, which are simple to process.

[0039] The hydraulic driver 60 of this embodiment is arranged on the end face of the main gear 20 facing the pre-tightening gear 30, and the hydraulic driver 60 is used to push the guide outer ring 50, so that the guide outer ring 50 drives the pre-tightening gear 30 away from the main gear 20. The hydraulic driver 60 of this embodiment is preferably an annular hydraulic cylinder to ensure that the guide outer ring 50 is evenly stressed. Specifically, an annular groove 21 is provided on the end face of the main gear 20 of this embodiment facing the pre-tightening gear 30, and the annular hydraulic cylinder is embedded in the annular groove 21 to facilitate the installation of the annular hydraulic cylinder on the main gear 20. A first sealing ring 94 is preferably provided between the outer peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove 21, and a second sealing ring 95 is preferably provided between the inner peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove 21 to ensure the airtightness of the annular hydraulic cylinder and the main gear 20.

[0040] The return spring 70 of this embodiment is arranged on the side of the preload gear 30 away from the main gear 20, so as to push the preload gear 30 close to the main gear 20. The return spring 70 of this embodiment is preferably sleeved on the shaft sleeve 80, and a convex ring 81 is formed on one end of the shaft sleeve 80 away from the main gear 20. The convex ring 81 protrudes from the outer peripheral wall of the shaft sleeve 80, and can limit the return spring 70 sleeved on the shaft sleeve 80. One end of the return spring 70 abuts against the end surface of the preload gear 30 away from the main gear 20, and the other end abuts against the convex ring 81, so as to facilitate the assembly of the return spring 70.

[0041] When the side clearance eliminating device of this embodiment supplies oil, the hydraulic driver 60 pushes the pre-tightening gear 30 through the guide outer ring 50, and the pre-tightening gear 30 overcomes the thrust of the return spring 70 and moves away from the main gear 20, so that the pre-tightening gear 30 moves axially and rotates circumferentially until it meshes with the transmission gear. The pre-tightening gear 30 and the transmission gear generate a pre-tightening force, thereby eliminating the meshing side clearance; when the side clearance eliminating device cancels the oil supply, the return spring 70 pushes the pre-tightening gear 30 to reset, so that the main gear 20 and the pre-tightening gear 30 meet the requirements of different working conditions.

[0042] The backlash elimination device of this embodiment also includes a hydraulic oil circuit, which preferably includes a first oil passage 90, a second oil passage 91, an oil distribution ring 92 and a third oil passage 93 connected in sequence. The first oil passage 90 enters the interior of the rotating shaft 10 from the end face of the rotating shaft 10 away from the main gear 20; the second oil passage 91 penetrates from the first oil passage 90 to the outer peripheral wall of the rotating shaft 10, and the oil outlet end of the second oil passage 91 is located on the side of the main gear 20 away from the preload gear 30; the third oil passage 93 penetrates from the end face of the main gear 20 away from the preload gear 30 to the other end face, so as to connect with the hydraulic driver 60, and the third oil passage 93 specifically penetrates to the annular groove 21 on the end face of the main gear 20 close to the preload gear 30; the oil distribution ring 92 is attached to the end face of the main gear 20 away from the preload gear 30, so as to connect the second oil passage 91 and the third oil passage 93, and a third sealing ring 96 is preferably provided between the oil distribution ring 92 and the main gear 20 to ensure the airtightness of the connection between the oil distribution ring 92 and the main gear 20. The oil distribution ring 92 avoids the need to separately provide an oil groove on the end surface of the main gear 20 for conveying hydraulic oil, thereby effectively ensuring the structural strength of the main gear 20 .

[0043] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A gear backlash elimination device, characterized in that: include: A rotating shaft (10); A main gear (20) fixedly connected to the rotating shaft (10); A pre-tightening gear (30) is movably sleeved on the rotating shaft (10) via a shaft sleeve (80); A guide assembly, comprising a guide inner ring (40) and a guide outer ring (50), wherein the guide inner ring (40) is synchronously rotatably connected to the rotating shaft (10), and the guide outer ring (50) is synchronously rotatably connected to the preload gear (30), and the guide outer ring (50) is movably sleeved on the guide inner ring (40); a spiral protrusion (42) is formed on the outer peripheral wall of the guide inner ring (40), and a spiral groove (51) for accommodating the spiral protrusion (42) is correspondingly formed on the inner peripheral wall of the guide outer ring (50); A hydraulic driver (60) is arranged on an end surface of the main gear (20) facing the pre-tightening gear (30), and the hydraulic driver (60) is used to push the guide outer ring (50) so that the guide outer ring (50) drives the pre-tightening gear (30) away from the main gear (20); A return spring (70) is arranged on a side of the pre-tightening gear (30) away from the main gear (20) and is used to push the pre-tightening gear (30) toward the main gear (20).

2. The backlash elimination device according to claim 1, characterized in that: The inner circumferential wall of the guide inner ring (40) is provided with a first internal spline (41), the rotating shaft (10) is provided with a first external spline (11) meshing with the first internal spline (41), one end of the guide inner ring (40) abuts against the main gear (20), and the other end abuts against the shaft sleeve (80).

3. The backlash elimination device according to claim 2, characterized in that: The first internal spline (41) and the first external spline (11) are involute splines.

4. The backlash elimination device according to claim 1, characterized in that: The end surface of the preload gear (30) facing the main gear (20) is provided with a second internal spline (31), and the outer peripheral wall of the guide outer ring (50) is provided with a second external spline (52) meshing with the second internal spline (31).

5. The backlash eliminating device according to claim 4, characterized in that: The second internal spline (31) and the second external spline (52) are rectangular splines.

6. The backlash eliminating device according to claim 1, characterized in that: The hydraulic driver (60) is an annular hydraulic cylinder. An annular groove (21) is provided on the end surface of the main gear (20) facing the preload gear (30), and the annular hydraulic cylinder is embedded in the annular groove (21).

7. The backlash eliminating device according to claim 6, characterized in that: A first sealing ring (94) is provided between the outer peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove (21), and a second sealing ring (95) is provided between the inner peripheral wall of the annular hydraulic cylinder and the groove wall of the annular groove (21).

8. The backlash eliminating device according to claim 1, characterized in that: The return spring (70) is sleeved on the shaft sleeve (80), and a convex ring (81) is formed at one end of the shaft sleeve (80) away from the main gear (20). One end of the return spring (70) abuts against the end surface of the preload gear (30) away from the main gear (20), and the other end abuts against the convex ring (81).

9. The backlash eliminating device according to claim 1, characterized in that: It also includes a hydraulic oil circuit, which includes a first oil passage (90), a second oil passage (91), an oil distribution ring (92) and a third oil passage (93) which are connected in sequence; The first oil passage (90) enters the interior of the rotating shaft (10) from the end face of the rotating shaft (10) away from the main gear (20); the second oil passage (91) penetrates from the first oil passage (90) to the outer peripheral wall of the rotating shaft (10), and the oil outlet end of the second oil passage (91) is located on the side of the main gear (20) away from the preload gear (30); the third oil passage (93) penetrates from the end face of the main gear (20) away from the preload gear (30) to the other end face, so as to be connected to the hydraulic driver (60); the oil distribution ring (92) is attached to the end face of the main gear (20) away from the preload gear (30), so as to be connected to the second oil passage (91) and the third oil passage (93).

10. The backlash eliminating device according to claim 9, characterized in that: A third sealing ring (96) is provided between the oil distribution ring (92) and the main gear (20).

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