Oil pump roller transmission assembly and gearbox

Abstract

The utility model relates to an oil pump roller transmission assembly and a gearbox. The oil pump roller transmission assembly comprises an input hub, a first friction roller, a second friction roller and an output shaft. Wherein the outer peripheral side of the input hub is coaxially sleeved with the transmission shaft in a torque transmission manner; the second friction roller abuts against the first friction roller, and torque can be transmitted between the first friction roller and the second friction roller through friction force. And the second friction roller coaxially sleeves the peripheral side of the output shaft in a torque transmission manner. The first friction roller and the second friction roller are adopted to replace a gear structure, the requirement for vibration noise can be met, cost is lower, and assembling is easy.

Description

Technical Field

[0001] This utility model relates to the field of hybrid power transmission technology. Specifically, this utility model relates to an oil pump roller transmission assembly and a transmission. Background Technology

[0002] In hybrid transmissions, a gear drive assembly is typically required to transmit torque from the electric motor to the oil pump. This gear drive assembly, which transmits torque to the oil pump, is a crucial component ensuring the proper functioning of all parts of the hydraulic system. All components of the transmission, including the gear drive assembly, are required to have excellent noise, vibration, and harshness (NVH) performance and to operate smoothly.

[0003] However, gears in gear transmission assemblies are typically machined by turning, which requires high precision and is costly. Therefore, there is an urgent need for an oil pump roller transmission assembly that is easy to assemble, relatively low in cost, and can meet NVH requirements. Utility Model Content

[0004] To solve the above technical problems, this utility model provides an oil pump roller transmission assembly and a gearbox.

[0005] In a first aspect, embodiments of the present invention provide an oil pump roller drive assembly, comprising: an input hub, a first friction roller, a second friction roller, and an output shaft. The first friction roller is coaxially and torsionally mounted on the outer periphery of the input hub; the second friction roller abuts against the first friction roller, and torque is transmitted between the first and second friction rollers through friction; the second friction roller is coaxially and torsionally mounted on the outer periphery of the output shaft. By using a first and second friction roller instead of a gear structure, the present invention can ensure vibration and noise requirements are met, and is also lower in cost and easier to assemble.

[0006] According to some optional embodiments, the central axis of the first friction roller is arranged parallel to the central axis of the second friction roller, and the outer peripheral side of the first friction roller and the outer peripheral side of the second friction roller are in torsionally abutting against each other.

[0007] According to some optional embodiments, the first friction roller includes an annular first roller body portion and a first friction contact layer disposed on the outer periphery of the first roller body portion; the second friction roller includes an annular second roller body portion and a second friction contact layer disposed on the outer periphery of the second roller body portion. The first friction contact layer and the second friction contact layer are in torsionally abutting against each other.

[0008] According to some optional embodiments, the first friction contact layer and the second friction contact layer are respectively disposed on the outer peripheral side of the first friction roller and the second friction roller by an adhesive process.

[0009] According to some optional embodiments, the first roller body is bent in the radial direction to form a radial outer ring, a radial inner ring, and a bent transition portion connecting the radial outer ring and the radial inner ring. The first friction contact layer is disposed on the outer periphery of the radial outer ring, and the radial inner ring is fitted onto the outer periphery of the input hub via an interference fit.

[0010] According to some optional embodiments, the cross-section of the bending transition is arc-shaped.

[0011] According to some optional embodiments, the central axis of the first friction roller is arranged parallel to the central axis of the second friction roller, and the axial side of the first friction roller and the axial side of the second friction roller are torsionally abutting each other.

[0012] According to some alternative embodiments, at least one of the first friction roller and the second friction roller is provided with a friction disc on an axial side adjacent to each other; the first friction roller and the second friction roller are torsionally abutted against each other through the friction disc.

[0013] According to some optional embodiments, at least one of the first friction roller and the second friction roller is provided with an axial compression spring on the axial sides opposite to each other, so that the first friction roller and the second friction roller are axially pressed against each other.

[0014] In a second aspect, embodiments of the present invention provide a gearbox, comprising: a motor, an oil pump, and an oil pump roller drive assembly as described in any of the foregoing embodiments. The oil pump roller drive assembly is disposed between the motor and the oil pump; wherein the motor is used to provide torque to the input hub, and the output axis outputs torque to the oil pump.

[0015] The oil pump roller transmission assembly and gearbox in the above embodiments use a first friction roller and a second friction roller to transmit torque through friction, replacing the traditional gear structure's gear meshing torque transmission. This ensures performance requirements for noise, vibration, and acoustic roughness while reducing manufacturing costs and facilitating assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A cross-sectional view of a gearbox according to some embodiments of the present invention is shown;

[0018] Figure 2 A cross-sectional view of a first friction roller and a second friction roller in a mating state according to some embodiments of the present invention is shown;

[0019] Figure 3 A perspective view of a first friction roller and a second friction roller according to some embodiments of the present invention is shown;

[0020] Figure 4 A cross-sectional view of a gearbox according to some other embodiments of the present invention is shown;

[0021] Figure 5 A cross-sectional view of a first friction roller and a second friction roller in a mating state, according to other embodiments of the present invention, is shown; and

[0022] Figure 6 A perspective view of a first friction roller and a second friction roller according to some other embodiments of the present invention is shown. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0024] According to embodiments of this utility model, an oil pump roller drive assembly and a gearbox using this oil pump roller drive assembly are provided. Particularly in hybrid transmissions, the motor and engine can be connected in parallel via a clutch for hybrid drive, or disconnected from each other via a clutch for individual drive. The motor in the transmission also needs to provide torque to the oil pump via the oil pump roller drive assembly to control and ensure the normal operation of various parts of the oil circuit system.

[0025] Figure 1 A cross-sectional view of a gearbox according to some embodiments of the present invention is shown. For example... Figure 1 The transmission shown includes a motor 100, an oil pump 200, and an oil pump roller drive assembly 300. The oil pump roller drive assembly 300 is disposed between the motor 100 and the oil pump 200; wherein the motor 100 provides torque to the oil pump 200 through the oil pump roller drive assembly 300. Furthermore, the transmission also includes an engine 400, and a clutch 500 is disposed between the engine 400 and the motor 100, the clutch 500 being capable of controlling whether the engine 400 and the motor 100 are connected in parallel or disconnected.

[0026] Furthermore, such as Figure 1 As shown, the gearbox also includes a main shaft 600. A first bearing 700 may be provided between the oil pump roller drive assembly 300 and the main shaft 600, and the main shaft 600 can provide radial support to the input hub 1 in the oil pump roller drive assembly 300 via the first bearing 700.

[0027] Optionally, since the radial support of the input hub 1 does not require high load-bearing capacity, the first bearing 700 can be a needle roller bearing, which better meets NVH requirements. Furthermore, the first bearing 700 is detachable, making the assembly of the oil pump roller drive assembly 300 simpler and easier. In addition, two first bearings 700 can be provided to ensure stable radial support for the input hub 1.

[0028] On the engine 400 side, the gearbox also has an engine input hub 800 that is torsionally connected to the engine 400. A second bearing 900 can be installed between the engine input hub 800 and the main shaft 600, and the main shaft 600 can provide radial support to the engine input hub 800 via the second bearing 900. Optionally, the second bearing 900 can be a needle roller bearing.

[0029] It is understood that the term "torsional connection" refers to a connection that can transmit torque, including but not limited to detachable torsional connections such as those that transmit torque through friction or those that transmit torque through gear meshing, as well as non-detachable torsional connections such as adhesive connections, welded connections, and integrally formed connections.

[0030] The following is a detailed introduction to the oil pump roller drive assembly 300.

[0031] See Figure 1As shown, in some embodiments, the oil pump roller drive assembly 300 includes: an input hub 1, a first friction roller 2, a second friction roller 3, and an output shaft 4. The hub 1 is radially supported on the outer periphery of the main shaft 600, and the output torque of the motor 100 is transmitted to the hub 1. The first friction roller 2 is coaxially and torsionally sleeved on the outer periphery of the input hub 1. The second friction roller 3 abuts against the first friction roller 2, and torque can be transmitted between the first friction roller 2 and the second friction roller 3 through friction. The second friction roller 3 is coaxially and torsionally sleeved on the outer periphery of the output shaft 4, and the output shaft 4 can output torque to the oil pump 200. Optionally, a spline structure 33 is provided on the inner periphery of the second friction roller 3, and the second friction roller 3 transmits torque to the output shaft 4 through the spline structure 33.

[0032] Through the oil pump roller transmission assembly 300 described in the above embodiment, the motor 100 can transmit torque to the input hub 1, the hub 1 can transmit torque to the first friction roller 2 which is anti-torsional connected to it, and then, through the friction between the first friction roller 2 and the second friction roller 3, the first friction roller 2 can transmit torque to the second friction roller 3, the second friction roller 3 is anti-torsional connected to the output shaft 4, and finally outputs torque to the oil pump 200.

[0033] The oil pump roller transmission assembly 300 in the above embodiments uses the first friction roller 2 and the second friction roller 3 to transmit torque through friction, replacing the traditional gear structure for transmitting torque by gear meshing. While ensuring the performance requirements of noise, vibration and acoustic roughness, it has lower processing and manufacturing costs and is easier to assemble.

[0034] Furthermore, Figure 2 A cross-sectional view of a first friction roller 2 and a second friction roller 3 in a mating state is shown according to some embodiments of the present invention; Figure 3 A perspective view of a first friction roller 2 and a second friction roller 3 according to some embodiments of the present invention is shown. Figures 1 to 3 As shown, in some embodiments, the central axis of the first friction roller 2 is arranged parallel to the central axis of the second friction roller 3, and the outer peripheral side of the first friction roller 2 and the outer peripheral side of the second friction roller 3 can be torsionally abutted against each other.

[0035] In other words, the second friction roller 3 is positioned radially on one side of the first friction roller 2. Both the outer circumferential surfaces of the first friction roller 2 and the second friction roller 3 have a certain coefficient of friction. Simultaneously, the second friction roller 3 and the first friction roller 2 are pressed together radially to provide sufficient positive pressure. Thus, within a certain torque threshold range, when the first friction roller 2 rotates, it applies a tangential frictional force to the second friction roller 3 at the point of contact, causing the second friction roller 3 to rotate. This allows torque to be transmitted between the second friction roller 3 and the first friction roller 2. The frictional force between the first friction roller 2 and the second friction roller 3 is primarily static friction.

[0036] Further, see Figure 2 and Figure 3 As shown, the first friction roller 2 includes an annular first roller body portion 21 and a first friction contact layer 22 disposed on the outer periphery of the first roller body portion 21; the second friction roller 3 includes an annular second roller body portion 31 and a second friction contact layer 32 disposed on the outer periphery of the second roller body portion 31. The first friction contact layer 22 and the second friction contact layer 32 are in torsionally abutting against each other.

[0037] Specifically, the first friction contact layer 22 and the second friction contact layer 32 can be made of flexible materials with certain frictional properties, such as paper-based materials with a certain coefficient of friction on their surface. The first friction contact layer 22 and the second friction contact layer 32 are respectively disposed on the outer peripheral sides of the first friction roller 2 and the second friction roller 3 by an adhesive bonding process. The adhesive bonding process forms friction contact layers on the outer peripheral sides of the first friction roller 2 and the second friction roller 3. The process is simple, and in particular, compared with traditional gear transmission, it does not require high-precision machining of the gear teeth by cutting processes, thus reducing manufacturing costs.

[0038] Furthermore, such as Figure 2 and Figure 3 As shown, in some embodiments, the first roller body 21 of the first friction roller 2 can be formed by a stamping process. Specifically, the first roller body 21 is bent in the radial direction to form a radial outer ring 211, a radial inner ring 212, and a bent transition portion 213 connecting the radial outer ring 211 and the radial inner ring 212.

[0039] like Figure 2 and Figure 3As shown, the first roller body 21 can be made of metal. The radial outer ring 211, the radial inner ring 212, and the bending transition 213 are integral structures. The annular circumferential surface of the first roller body 21 is bent radially inward or radially outward by 180 degrees, thereby forming the radial outer ring 211 and the radial inner ring 212 that are concentric and spaced apart in the radial direction.

[0040] The first friction contact layer 22 is disposed on the outer periphery of the radial outer ring portion 211, and the radial inner ring portion 212 can be fitted onto the outer periphery of the input hub 1 through an interference fit, so that the first friction roller 2 and the input hub 1 are connected against torsion. Therefore, the assembly between the first friction roller 2 and the input hub 1 is simpler.

[0041] In some embodiments, the bending transition portion 213 can be designed as a structure with an arc-shaped cross-section, so that the bending of the bending transition portion 213 is smoother, avoiding the occurrence of bends, thereby reducing structural fatigue caused by bending and reducing the risk of the first roller body portion 21 deforming and breaking during the stamping or assembly process.

[0042] This utility model also provides other embodiments of the oil pump roller drive assembly 300 in other embodiments. Figure 4 A cross-sectional view of a gearbox according to some other embodiments of the present invention is shown; Figure 5 A cross-sectional view of the first friction roller 2 and the second friction roller 3 in a mating state, according to other embodiments of the present invention, is shown; and Figure 6 A perspective view of a first friction roller 2 and a second friction roller 3 according to some other embodiments of the present invention is shown.

[0043] Combination Figures 4 to 6 As shown, the central axis of the first friction roller 2 is parallel to the central axis of the second friction roller 3, and the axial side of the first friction roller 2 and the axial side of the second friction roller 3 are in torsionally abutting each other.

[0044] Specifically, the first friction roller 2 and the second friction roller 3 partially overlap in the axial direction, and the overlapping area does not cover the central axis of the first friction roller 2 and the second friction roller 3, that is, neither the central axis of the first friction roller 2 nor the central axis of the second friction roller 3 falls into the overlapping area.

[0045] The adjacent axial surfaces of the first friction roller 2 and the second friction roller 3 have sufficient coefficients of friction and are in direct or indirect contact to transmit torque. For example, the adjacent axial surfaces of the first friction roller 2 and the second friction roller 3 are both surfaces with sufficient coefficients of friction, and the adjacent axial surfaces of the first friction roller 2 and the second friction roller 3 directly abut each other to transmit torque. Alternatively, a friction disc can be provided between the first friction roller 2 and the second friction roller 3, and the first friction roller 2 and the second friction roller 3 can be in indirect contact through the friction disc to transmit torque.

[0046] Specifically, at least one of the first friction roller 2 and the second friction roller 3 is provided with a friction disc 5 on its adjacent axial side; as in Figures 4 to 6 In the embodiment shown, a friction disk 5 coaxial with the first friction roller 2 is provided on the axial side facing the second friction roller 3. The first friction roller 2, the second friction roller 3 and the friction disk 5 between them are pressed together in the axial direction, so that the first friction roller 2 and the second friction roller 3 can be torsionally abutted together through the friction disk 5.

[0047] like Figures 4 to 6 As shown, in order to ensure that the first friction roller 2, the second friction roller 3 and the friction disc 5 between them have sufficient clamping force in the axial direction, at least one of the first friction roller 2 and the second friction roller 3 is provided with an axial clamping spring 6 on the axial side opposite to each other, so that the first friction roller 2 and the second friction roller 3 are axially pressed together.

[0048] Optionally, the compression spring 6 is a disc spring.

[0049] Furthermore, the input hub 1 may have a radial protrusion on the axial side of the first friction roller 2 away from the second friction roller 3, for example. A compression spring 6 is disposed between the radial protrusion of the input hub 1 and the first friction roller 2, such that the radial protrusion of the input hub 1 axially limits the compression spring 6, thereby providing an axial clamping force on the first friction roller 2 towards the second friction roller. This arrangement ensures sufficient friction between the first friction roller 2 and the second friction roller 3 to transmit torque.

[0050] This utility model also provides a gearbox, such as Figure 1 and Figure 4 As shown, in some embodiments, the gearbox includes: a motor 100, an oil pump 200, and an oil pump roller drive assembly 300 as described in any of the foregoing embodiments. The oil pump roller drive assembly 300 is disposed between the motor 100 and the oil pump 200; wherein the motor 100 is used to provide torque to the input hub 1, and the output shaft 4 outputs torque to the oil pump 200.

[0051] The specific structure and working principle of the gearbox have been described above and will not be repeated here.

[0052] Through the oil pump roller transmission assembly 300 and gearbox in the above embodiments, the first friction roller 2 and the second friction roller 3 transmit torque through friction, replacing the traditional gear structure's gear meshing to transmit torque. While ensuring the performance requirements of noise, vibration and acoustic roughness, the processing and manufacturing cost is lower and it is easier to assemble.

[0053] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of the embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of this invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes, particularly regarding the function and structure of the components, can be made without departing from the scope of the claims.

[0054] Appendix Label Table

[0055] 100. Electric motor;

[0056] 200. Retaining ring;

[0057] 300. Oil pump roller drive assembly; 1. Input hub; 2. First friction roller; 21. First roller body; 211. Radial outer ring; 212. Radial inner ring; 213. Bent transition section; 22. First friction contact layer; 3. Second friction roller; 31. Second roller body; 32. Second friction contact layer; 33. Spline structure; 4. Output shaft; 5. Friction disc; 6. Compression spring;

[0058] 400. Engine;

[0059] 500. Clutch;

[0060] 600. Spindle;

[0061] 700. First bearing;

[0062] 800. Engine input hub;

[0063] 900. Second bearing.

Claims

1. An oil pump roller drive assembly, characterized in that, include: Input hub (1); The first friction roller (2) is coaxially and torsionally sleeved on the outer periphery of the input hub (1); The second friction roller (3) abuts against the first friction roller (2), and torque can be transmitted between the first friction roller (2) and the second friction roller (3) through friction; and Output shaft (4), wherein the second friction roller (3) is coaxially and torsionally sleeved on the outer periphery of the output shaft (4).

2. The oil pump roller drive assembly according to claim 1, characterized in that, The central axis of the first friction roller (2) is parallel to the central axis of the second friction roller (3), and the outer peripheral side of the first friction roller (2) and the outer peripheral side of the second friction roller (3) can be torsionally abutted against each other.

3. The oil pump roller drive assembly according to claim 2, characterized in that, The first friction roller (2) includes an annular first roller body (21) and a first friction contact layer (22) disposed on the outer periphery of the first roller body (21); the second friction roller (3) includes an annular second roller body (31) and a second friction contact layer (32) disposed on the outer periphery of the second roller body (31). The first friction contact layer (22) and the second friction contact layer (32) can be torsionally abutted against each other.

4. The oil pump roller drive assembly according to claim 3, characterized in that, The first friction contact layer (22) and the second friction contact layer (32) are respectively disposed on the outer periphery of the first friction roller (2) and the second friction roller (3) by a bonding process.

5. The oil pump roller drive assembly according to claim 3, characterized in that, The first roller body (21) is bent in the radial direction to form a radial outer ring (211), a radial inner ring (212), and a bent transition (213) connecting the radial outer ring (211) and the radial inner ring (212). The first friction contact layer (22) is disposed on the outer periphery of the radial outer ring (211), and the radial inner ring (212) is fitted onto the outer periphery of the input hub (1) by an interference fit.

6. The oil pump roller drive assembly according to claim 5, characterized in that, The cross-section of the bending transition section (213) is arc-shaped.

7. The oil pump roller drive assembly according to claim 1, characterized in that, The central axis of the first friction roller (2) is parallel to the central axis of the second friction roller (3), and the axial side of the first friction roller (2) and the axial side of the second friction roller (3) are in torsionally abutting against each other.

8. The oil pump roller drive assembly according to claim 7, characterized in that, At least one of the first friction roller (2) and the second friction roller (3) is provided with a friction disk (5) on the axial side adjacent to each other; the first friction roller (2) and the second friction roller (3) are torsionally abutted against each other through the friction disk (5).

9. The oil pump roller drive assembly according to claim 7, characterized in that, At least one of the first friction roller (2) and the second friction roller (3) is provided with an axial compression spring (6) on the axial side opposite to each other, so that the first friction roller (2) and the second friction roller (3) are axially pressed against each other.

10. A gearbox, characterized in that, include: Motor (100); Oil pump (200); as well as The oil pump roller drive assembly (300) as described in any one of claims 1 to 9 is disposed between the motor (100) and the oil pump (200); wherein the motor (100) is used to provide torque to the input hub (1), and the output shaft (4) outputs torque to the oil pump (200).

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