Anti-backlash gear and engine transmission system

Abstract

The utility model relates to the technical field of transmission parts, and discloses an anti-backlash gear and an engine transmission system, in the anti-backlash gear, a connecting shaft comprises a shaft body and at least one convex block arranged on the shaft body, and the convex block comprises a first part and a second part along the shaft body; the center of the first gear and the center of the second gear are each provided with a through part, and each through part comprises mounting grooves in one-to-one correspondence with the protruding blocks; the first gear and the second gear are both arranged on the connecting shaft in a sleeving manner, the first part is inserted into a corresponding mounting groove in the first gear, and the second part is inserted into a corresponding mounting groove in the second gear; the first part is provided with at least one first mounting hole, and the second part is provided with at least one second mounting hole; an elastic assembly is arranged in each mounting hole, the elastic assembly arranged in the first mounting hole is used for pushing the first gear to rotate in the clockwise direction, and the elastic assembly arranged in the second mounting hole is used for pushing the second gear to rotate in the anticlockwise direction. According to the scheme, the problem that an anti-backlash gear can only eliminate a single-side backlash can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission component technical field, especially relates to a kind of lost motion gear and engine transmission system. BACKGROUND

[0002] Affected by gear machining error and part tolerance and other factors, during gear transmission, two mutually meshing gears will produce side gap when contact, and will produce knocking due to side gap, and very big knocking noise is simultaneously produced. The lost motion gear in the prior art can only be used as the end gear position, to eliminate the single side gap on the side of lost motion gear. SUMMARY

[0003] The utility model provides a kind of lost motion gear and engine transmission system, can improve the problem that lost motion gear can only eliminate single side gap.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A kind of lost motion gear includes first gear, second gear, connecting shaft and elastic component, the connecting shaft includes shaft body and at least one lug being arranged on the circumference of the shaft body, each the lug includes the first part and the second part arranged along the axis direction of the shaft body;The center of the first gear and the second gear is equipped with the through portion matched with the shape of the connecting shaft, the through portion includes the installation slot corresponding to the lug;The first gear and the second gear are all set on the connecting shaft, the first part is inserted in the corresponding installation slot on the first gear, and the second part is inserted in the corresponding installation slot on the second gear;

[0006] The first part is equipped with at least one first installation hole, and the second part is equipped with at least one second installation hole;Each installation hole is equipped with an elastic component, the elastic component arranged in each first installation hole is used to push the first gear to rotate in clockwise direction, and the elastic component arranged in each second installation hole is used to push the second gear to rotate in counterclockwise direction.

[0007] Optionally, the extension direction of the elastic component is perpendicular to the diameter direction of the shaft body at the position where the elastic component is located and parallel to the end face of the first gear;The elastic component arranged in each first installation hole is exposed to the lug in clockwise direction, and the elastic component arranged in each second installation hole is exposed to the lug in counterclockwise direction;The side wall of the installation slot of the first gear and the second gear is respectively formed with the limiting slot corresponding to each elastic component, the part of the elastic component exposed to the lug is in abutment with the limiting slot, and the length of the part of the elastic component exposed to the lug is greater than the size of the limiting slot in the same direction.

[0008] Optionally, the circumferential surface of the shaft body is provided with at least one protrusion group, each of the protrusion groups comprises two protrusions which are arranged at two ends of the same diameter of the shaft body.

[0009] Optionally, the circumferential surface of the shaft body is provided with two protrusion groups, and the four protrusions are uniformly distributed in the circumferential direction of the shaft body.

[0010] Optionally, the elastic assembly comprises an elastic member and a spherical connecting member, one end of the elastic member is connected with the first mounting hole or the second mounting hole, and the other end of the elastic member is connected with the spherical connecting member, and the spherical connecting member is exposed on the surface of the protrusion.

[0011] Optionally, the first mounting hole is a threaded hole, and the elastic assembly arranged in the threaded hole comprises a threaded stud arranged in the threaded hole.

[0012] The threaded stud has an open-ended accommodating cavity, one end of the elastic member is connected with the bottom of the accommodating cavity, and the other end is connected with the spherical connecting member.

[0013] Optionally, the second mounting hole is a threaded hole, and the elastic assembly arranged in the threaded hole comprises a threaded stud arranged in the threaded hole.

[0014] The threaded stud has an open-ended accommodating cavity, one end of the elastic member is connected with the bottom of the accommodating cavity, and the other end is connected with the spherical connecting member.

[0015] Optionally, in the thickness direction of the first gear, the limiting groove on the first gear is located in the middle of the first gear.

[0016] And / or, in the thickness direction of the second gear, the limiting groove on the second gear is located in the middle of the second gear.

[0017] Optionally, the surface of the protrusion, on which the elastic assembly is exposed, is provided with a damping material layer, the thickness of the damping material layer is less than the thickness of the elastic assembly exposed on the protrusion in the same direction when the elastic assembly is compressed to the shortest.

[0018] The utility model also provides a kind of engine transmission system, and the engine transmission system includes any kind of lost motion gear provided in the above technical solution.

[0019] The scheme can make the tooth sheet of the first gear and the second gear produce a certain amount of tooth offset, eliminate the backlash of the front and rear gear pairs in the meshing process, and further reduce the impact in the gear transmission process, improve the reliability of the lost motion gear. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A front view of the backlash gear provided by the utility model,

[0021] Figure 2 An exploded view of the backlash gear provided by the utility model,

[0022] Figure 3 A structural schematic view of the connecting shaft and the elastic assembly in the backlash gear provided by the utility model,

[0023] Figure 4 A structural schematic view of the elastic assembly in the backlash gear provided by the utility model.

[0024] Icon: 1 - first gear; 2 - second gear; 121 - mounting groove; 122 - limiting groove; 3 - connecting shaft; 31 - shaft body; 32 - protruding block; 321 - first mounting hole; 322 - second mounting hole; 4, 4a, 4b - elastic assembly; 41 - elastic piece; 42 - spherical connecting piece; 43 - stud. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0026] Figure 1 A front view of the backlash gear provided by the utility model, Figure 2 An exploded view of the backlash gear provided by the utility model, as Figure 1 And Figure 2 The backlash gear provided by the utility model includes a first gear 1, a second gear 2, a connecting shaft 3 and an elastic assembly 4. The connecting shaft 3 includes a shaft body 31 and at least one protruding block 32 arranged on the surface of the shaft body 31. Each protruding block 32 includes a first part and a second part arranged along the axis m direction of the shaft body 31. The centers of the first gear 1 and the second gear 2 are provided with through parts matched with the shape of the connecting shaft 3. The through parts include mounting grooves 121 corresponding to the protruding blocks 32 one by one. The first gear 1 and the second gear 2 are both sleeved on the connecting shaft 3. The first part is inserted into the corresponding mounting groove 121 of the first gear 1, and the second part is inserted into the corresponding mounting groove 121 of the second gear 2.

[0027] The first part is provided with at least one first mounting hole 321, and the second part is provided with at least one second mounting hole 322. An elastic assembly 4 is arranged in each mounting hole, and the elastic assembly 4 arranged in each first mounting hole 321 is used to push the first gear 1 to rotate in the clockwise direction, and the elastic assembly 4 arranged in each second mounting hole 322 is used to push the second gear 2 to rotate in the counterclockwise direction. Thus, the tooth pieces of the first gear 1 and the second gear 2 can be made to have a certain amount of tooth misalignment, the side clearance of the front and rear gear pairs in the meshing process can be eliminated, and then the impact in the gear transmission process can be reduced, and the reliability of the clearance-eliminating gear can be improved.

[0028] It is worth noting that the through holes in the centers of the first gear 1 and the second gear 2 are matched with the shape of the connecting shaft 3, that is, in the cross section perpendicular to the axis m of the shaft body 31, the shape of the through hole is the same as or substantially the same as the shape of the connecting shaft 3, and there is a certain gap between the exposed surface of the protrusion 32 on which the elastic assembly 4 is exposed and the corresponding side wall of the mounting groove 121. Figure 2 One of the elastic assemblies 4 in the clearance-eliminating gear shown in the figure is taken as an example, the elastic assembly 4 is exposed on the a surface of the protrusion 32, and the b surface of the mounting groove 121 of the second gear 2 is opposite to the a surface of the protrusion 32, and there is a gap between the a surface and the b surface.

[0029] In a specific implementation manner, the extension direction of the elastic assembly 4 is perpendicular to the diameter direction of the shaft body 31 at the position of the elastic assembly 4 and is parallel to the end surface of the first gear 1. As shown in Figure 2 and Figure 3 The elastic assembly 4a arranged in each first mounting hole 321 is exposed on the protrusion 32 in the clockwise direction, and the elastic assembly 4b arranged in each second mounting hole 322 is exposed on the protrusion 32 in the counterclockwise direction. The side wall of the mounting groove 121 of the first gear 1 and the second gear 2 is respectively formed with a limiting groove 122 corresponding to each elastic assembly 4, the part of the elastic assembly 4 exposed on the protrusion 32 abuts against the limiting groove 122, and the length d' of the part of the elastic assembly 4 exposed on the protrusion 32 is greater than the size of the limiting groove 122 in the same direction.

[0030] In this scheme, the elastic assembly 4 arranged in each first mounting hole 321 is exposed on the corresponding protrusion 32 in the clockwise direction, and the part of the elastic assembly 4 exposed on the protrusion 32 abuts against the corresponding limiting groove 122 on the first gear 1, so that the first gear 1 can rotate clockwise relative to the second gear 2. The elastic assembly 4 arranged in each second mounting hole 322 is exposed on the corresponding protrusion 32 in the counterclockwise direction, and the part of the elastic assembly 4 exposed on the protrusion 32 abuts against the corresponding limiting groove 122 on the second gear 2, so that the second gear 2 can rotate counterclockwise relative to the first gear 1. Thus, the tooth pieces of the first gear 1 and the second gear 2 can be made to have a certain amount of tooth misalignment, the side clearance of the front and rear gear pairs in the meshing process can be eliminated, and then the impact in the gear transmission process can be reduced, and the reliability of the clearance-eliminating gear can be improved.

[0031] In actual implementation, the connecting shaft 3 can be an integral structure (as shown in Figure 1 ), or the shaft body 31 and the protruding block 32 can be separate structures, and the protruding block 32 is fixed to the peripheral surface of the shaft body 31. In the latter case, when the protruding block 32 is multiple, the multiple protruding blocks 32 can be an integral structure, as shown in Figure 2 .

[0032] In one possible implementation, the peripheral surface of the shaft body 31 is provided with at least one protruding block group, each protruding block group includes two protruding blocks 32, and the two protruding blocks 32 in each protruding block group are arranged at two ends of the same diameter of the shaft body 31. In this way, the balance and stability of the first gear 1 and the second gear 2 are both better. It can be understood that, in this case, the through portions of the first gear 1 and the second gear 2 each include an installation slot 121 corresponding to the protruding block 32.

[0033] In one specific implementation, as shown in Figure 1 and Figure 2 , the peripheral surface of the shaft body 31 is provided with two protruding block groups, and the four protruding blocks 32 are uniformly distributed in the peripheral direction of the shaft body 31. In this scheme, the balance and stability of the first gear 1 and the second gear 2 are both better during the meshing with the corresponding gears. It can be understood that, in this case, the through portions of the first gear 1 and the second gear 2 each include an installation slot 121 corresponding to the protruding block 32. In addition, the number of protruding blocks 32 is not limited to the above case, and can be specifically set according to actual needs.

[0034] As shown in Figure 4 , in one possible implementation, the elastic assembly 4 includes an elastic piece 41 and a spherical connecting piece 42, one end of the elastic piece 41 is connected with the corresponding first installation hole 321 or the second installation hole 322, the other end of the elastic piece 41 is connected with the spherical connecting piece 42, and the spherical connecting piece 42 is exposed on the corresponding surface of the protruding block 32. Still taking one of the elastic assemblies 4 in the anti-backlash gear shown in Figure 2 as an example, the elastic assembly 4 is exposed on the a surface of the protruding block 32 in the counterclockwise direction, specifically, the spherical connecting piece 42 in the elastic assembly 4 is exposed on the a surface of the protruding block 32.

[0035] Exemplarily, the elastic piece 41 can be a spring. The spring stiffness is used to ensure the anti-backlash effect, and the reliability is obviously improved. In addition, the spherical connecting piece 42 can be a spherical piece, or a spherical piece that is partially cut, or the spherical connecting piece 42 can include a spherical part and a cylindrical part connected with each other. In the last case, the cylindrical part is located inside the spherical part.

[0036] In a specific implementation, the first mounting hole 321 is a threaded hole, and the elastic assembly 4 arranged in the first mounting hole 321 includes a threaded stud 43 arranged in the threaded hole. The threaded stud 43 has an open-ended receiving cavity, and the elastic member 41 is connected to the bottom of the receiving cavity at one end (i.e., the elastic member 41 is connected to the first mounting hole 321 through the threaded stud 43), and connected to the spherical connecting member 42 at the other end. With this scheme, the elastic assembly 4 is more convenient to arrange in the corresponding first mounting hole 321.

[0037] In a possible implementation, the second mounting hole 322 is a threaded hole, and the elastic assembly 4 arranged in the second mounting hole 322 includes a threaded stud 43 arranged in the threaded hole. The threaded stud 43 has an open-ended receiving cavity, and the elastic member 41 is connected to the bottom of the receiving cavity at one end (i.e., the elastic member 41 is connected to the second mounting hole 322 through the threaded stud 43), and connected to the spherical connecting member 42 at the other end. With this scheme, the elastic assembly 4 is more convenient to arrange in the corresponding second mounting hole 322.

[0038] Obviously, the depth of the threaded hole is not less than the length L of the threaded stud 43, that is, the depth of the threaded hole is greater than or equal to the length L of the threaded stud 43. With the moving stroke of the spherical connecting member 42 being d and the depth of the limiting groove 122 being d', the gap elimination width D of one side of the gap elimination gear is d-d'.

[0039] In this scheme, if the tooth side gap is determined, the corresponding stiffness of the elastic member 41 can be calculated according to the load conditions of the two sides of the gap elimination gear, so as to ensure the elimination of the meshing gear gap between the front and back sides of the gap elimination gear and improve the reliability of the gap elimination gear. According to the load size of the gap elimination gear, a suitable spring stiffness is selected, which is beneficial to improve the service life of the gap elimination gear and ensure normal power transmission.

[0040] It should be understood that the elastic assembly 4 can also adopt other implementations, for example, a hydraulic assembly or a magnetic spring bolt assembly, etc.

[0041] In a possible implementation, in the thickness direction of the first gear 1, the limiting groove 122 on the first gear 1 is located in the middle of the first gear 1, so that the first gear 1 has better balance and stability in the process of meshing with other gears.

[0042] In a possible implementation, in the thickness direction of the second gear 2, the limiting groove 122 on the second gear 2 is located in the middle of the second gear 2, so that the second gear 2 has better balance and stability in the process of meshing with other gears.

[0043] In a possible implementation, the surface of the protrusion 32 exposing the elastic component 4 is provided with a layer of damping material, and the thickness of the layer of damping material is less than the length of the elastic component 4 exposed to the protrusion 32 in the same direction when the elastic component 4 is compressed to the shortest length, so as to achieve the effect of damping and noise reduction without affecting the elimination of backlash. It should be understood that the shortest length of the elastic component 4 referred to herein refers to the shortest length of the elastic component 4 after compression in the process of meshing of the corresponding first gear or second gear with the gears on the front and rear sides, rather than the compression limit of the elastic component when the elastic component exists independently.

[0044] The backlash gear mentioned in the embodiment can act on the idler gear located in the middle of the rotating chain.

[0045] The engine transmission system provided by the embodiment includes the backlash gear. In the backlash gear, the elastic component 4 arranged in each first mounting hole 321 is exposed to the corresponding protrusion 32 in the clockwise direction, and the part of the elastic component 4 exposed to the protrusion 32 abuts against the corresponding limiting groove 122 on the first gear 1, so that the first gear 1 can rotate clockwise relative to the second gear 2. The elastic component 4 arranged in each second mounting hole 322 is exposed to the corresponding protrusion 32 in the counterclockwise direction, and the part of the elastic component 4 exposed to the protrusion 32 abuts against the corresponding limiting groove 122 on the second gear 2, so that the second gear 2 can rotate counterclockwise relative to the first gear 1. Thus, the toothed sheets of the first gear 1 and the second gear 2 can have a certain tooth offset, the backlash of the front and rear gear pairs in the meshing process can be eliminated, the impact in the gear transmission process can be reduced, and the reliability of the backlash gear can be improved.

[0046] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and the equivalent technology thereof, the present application also intends to include these modifications and variations.

Claims

1. A lost motion gear characterized by, The application relates to a gear transmission device, which comprises a first gear, a second gear, a connecting shaft and elastic components, the connecting shaft comprises a shaft body and at least one protrusion arranged on the circumferential surface of the shaft body, each protrusion comprises a first part and a second part arranged along the axial direction of the shaft body, the center of the first gear and the second gear is provided with a through part matched with the shape of the connecting shaft, the through part comprises an installation slot corresponding to the protrusion, the first gear and the second gear are sleeved on the connecting shaft, the first part is inserted into the corresponding installation slot of the first gear, and the second part is inserted into the corresponding installation slot of the second gear. The first part is provided with at least one first installation hole, the second part is provided with at least one second installation hole, each installation hole is provided with an elastic component, the elastic component arranged in each first installation hole is used for pushing the first gear to rotate in the clockwise direction, and the elastic component arranged in each second installation hole is used for pushing the second gear to rotate in the counterclockwise direction.

2. The lost motion gear of claim 1, wherein The stretching direction of the elastic component is perpendicular to the diameter direction of the shaft body at the position of the elastic component and parallel to the end surface of the first gear, the elastic component arranged in each first installation hole is exposed to the protrusion in the clockwise direction, the elastic component arranged in each second installation hole is exposed to the protrusion in the counterclockwise direction, the side wall of the installation slot of the first gear and the second gear is respectively formed with a limiting slot corresponding to each elastic component, the part of the elastic component exposed to the protrusion is in abutment with the limiting slot, and the length of the part of the elastic component exposed to the protrusion is greater than the size of the limiting slot in the same direction.

3. The lost motion gear of claim 2, wherein, The circumferential surface of the shaft body is provided with at least one protrusion group, each protrusion group comprises two protrusions arranged at the two ends of the same diameter of the shaft body.

4. The lost motion gear of claim 3, wherein The circumferential surface of the shaft body is provided with two protrusion groups, and four protrusions are uniformly distributed in the circumferential direction of the shaft body.

5. The lost motion gear of claim 2, wherein, The elastic component comprises an elastic piece and a spherical connecting piece, one end of the elastic piece is connected with the corresponding first installation hole or second installation hole, the other end of the elastic piece is connected with the spherical connecting piece, and the spherical connecting piece is exposed to the surface of the protrusion.

6. The lost motion gear of claim 5, wherein, The first installation hole is a threaded hole, the elastic component arranged in the first installation hole comprises a threaded hole, and the threaded hole is arranged in the threaded hole. The threaded hole has an open-ended accommodating cavity, one end of the elastic piece is connected with the bottom of the accommodating cavity, and the other end is connected with the spherical connecting piece.

7. The lost motion gear of claim 5, wherein The second installation hole is a threaded hole, the elastic component arranged in the second installation hole comprises a threaded hole, and the threaded hole is arranged in the threaded hole. The threaded hole has an open-ended accommodating cavity, one end of the elastic piece is connected with the bottom of the accommodating cavity, and the other end is connected with the spherical connecting piece.

8. A lost motion gear as claimed in any one of claims 2 to 6, wherein, In the thickness direction of the first gear, the limiting slot on the first gear is located in the middle of the first gear. And / or, in the thickness direction of the second gear, the limiting groove on the second gear is located in the middle of the second gear.

9. A lost motion gear as claimed in any one of claims 1 to 6, wherein, The surface of the protrusion exposed to the elastic assembly is provided with a damping material layer, and the thickness of the damping material layer is less than the thickness of the elastic assembly exposed to the protrusion in the same direction when the elastic assembly is compressed to the shortest.

10. An engine drive system characterized by, The anti-backlash gear according to any one of claims 1-9.

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