阅读说明：本技术 动力传输装置 (Power transmission device ) 是由 刘兴芬 于 2021-08-26 设计创作，主要内容包括：一种动力传输装置,包括：离合器,包括输出轮毂,所述输出轮毂的内部设置有周向分布的凸起部,所述凸起部的凸起延伸方向朝向所述输出轮毂的中心,所述输出轮毂适于连接变速箱输入轴；弹性件,整体呈环形结构,同轴设置于所述输出轮毂的内部,所述弹性件包括第一轴向端面和第二轴向端面,所述第一轴向端面和第二轴向端面均为平面,所述第一轴向端面适于抵接于所述凸起部,所述第二轴向端面适于抵接于所述变速箱输入轴。由于弹性件结构简单,便于安装,从而可以缩短低动力传输装置的装配周期,且弹性件便于加工,能够降低成本。(A power transmission device comprising: the clutch comprises an output hub, wherein the output hub is internally provided with a plurality of circumferentially distributed bulges, the extending direction of the bulges faces to the center of the output hub, and the output hub is suitable for being connected with an input shaft of a gearbox; the elastic piece wholly is the loop configuration, coaxial set up in output wheel hub's inside, the elastic piece includes first axial terminal surface and second axial terminal surface, first axial terminal surface and second axial terminal surface are the plane, first axial terminal surface be suitable for the butt in the bellying, second axial terminal surface be suitable for the butt in the gearbox input shaft. The elastic part has a simple structure and is convenient to install, so that the assembly period of the low-power transmission device can be shortened, the elastic part is convenient to process, and the cost can be reduced.)

1. A power transmission device, comprising:

the clutch comprises an output hub, wherein the output hub is internally provided with a plurality of circumferentially distributed bulges, the extending direction of the bulges faces to the center of the output hub, and the output hub is suitable for being connected with an input shaft of a gearbox;

the elastic piece wholly is the loop configuration, coaxial set up in output wheel hub's inside, the elastic piece includes first axial terminal surface and second axial terminal surface, first axial terminal surface and second axial terminal surface are the plane, first axial terminal surface be suitable for the butt in the bellying, second axial terminal surface be suitable for the butt in the gearbox input shaft.

2. The power transmission device of claim 1, wherein the elastic member has a helical configuration.

3. The power transmission device of claim 2, wherein the first axial end surface of the elastic member includes coils of different diameters.

4. The power transmission device according to claim 3, wherein the second axial end face of the elastic member includes coils of different diameters.

5. The power transmission device as claimed in claim 1, wherein the number of the protrusions is at least 3, and the protrusions are evenly distributed at intervals in a circumferential direction of the output hub.

6. The power transmission device as claimed in any one of claims 1 to 5, wherein the material of the elastic member is spring steel.

7. The power transmission device according to any one of claims 1 to 5, wherein the processing of the boss is a cold working process.

Technical Field

The embodiment of the invention relates to the technical field of machinery, in particular to a power transmission device.

Background

The clutch is arranged between the transmission and the engine, a driving disc of the clutch is connected with an output shaft of the engine, and an output hub of the clutch is connected with an input shaft of the transmission. The output hub of the clutch is preloaded with a thrust ball bearing through the transmission input shaft, and the thrust ball bearing is used for bearing axial load. In order to ensure that the thrust ball bearing maintains an axial pre-tightening state and prolong the service life of the thrust ball bearing, an axial pre-tightening assembly used for providing axial force for the thrust ball bearing is arranged in the output hub and comprises a stop ring, a coil spring and a retainer ring.

However, in the process of mounting the axial pretensioning assembly on the output hub, the stop ring, the coil spring and the retainer ring need to be assembled first, and then the retainer ring needs to be mounted finally, i.e. the three parts of the stop ring, the coil spring and the retainer ring of the axial pretensioning assembly are assembled separately, so that the assembly period is long and the assembly process is complicated. Moreover, the retainer ring and the stop ring are manufactured by a stamping process, which is very costly.

Therefore, how to reduce the cost of the power transmission device and simplify the installation of the power transmission device becomes a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the invention solves the technical problems of reducing the cost of the power transmission device and simplifying the installation of the power transmission device.

To solve the above problem, an embodiment of the present invention provides a power transmission device, including:

the clutch comprises an output hub, wherein the output hub is internally provided with a plurality of circumferentially distributed bulges, the extending direction of the bulges faces to the center of the output hub, and the output hub is suitable for being connected with an input shaft of a gearbox;

the elastic piece wholly is the loop configuration, coaxial set up in output wheel hub's inside, the elastic piece includes first axial terminal surface and second axial terminal surface, first axial terminal surface and second axial terminal surface are the plane, first axial terminal surface be suitable for the butt in the bellying, second axial terminal surface be suitable for the butt in the gearbox input shaft.

Optionally, the elastic member is in a helical structure.

Optionally, the first axial end face of the resilient member comprises coils of different diameters.

Optionally, the second axial end face of the resilient member comprises coils of different diameters.

Optionally, the number of the protruding portions is at least 3, and the protruding portions are evenly distributed along the circumferential direction of the output hub.

Optionally, the material of the elastic member is spring steel.

Optionally, the machining process of the boss is a cold working process.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

when the power transmission device provided by the embodiment of the invention is installed, the elastic piece which is integrally in an annular structure is coaxially arranged in the clutch output hub, so that the first axial end face of the elastic piece abuts against the boss of the output hub, the second axial end face abuts against the input shaft of the gearbox, and the thrust ball bearing is ensured to maintain an axial pre-tightening state by utilizing the elastic deformation of the elastic piece. Because of first axial terminal surface and second axial terminal surface are the plane, can increase the area of contact of first axial terminal surface and bellying and the area of contact of second axial terminal surface and gearbox input shaft to improve contact stability, be favorable to the stable transmission of axial pretightning force, improve thrust ball bearing's pretension effect, prolong thrust ball bearing's life. Furthermore, the elastic part is simple in structure and convenient to install, so that the assembly period of the low-power transmission device can be shortened, the elastic part is convenient to process, and the cost can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a power transmission device;

FIG. 2 is another partial schematic view of the power transmission device of FIG. 1;

fig. 3 is a partial sectional view of a power transmission device provided in an embodiment of the present invention;

FIG. 4 is another partial schematic view of a power transmission device provided in accordance with an embodiment of the present invention;

FIG. 5 is an enlarged partial schematic view of region A of FIG. 4;

FIG. 6 is another partial schematic view of a power transmission device provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic structural view of an elastic member of the power transmission device according to the embodiment of the present invention; fig. 8 is a schematic end view of an elastic member of the power transmission device according to the embodiment of the present invention;

fig. 9 is a side view of an elastic member of the power transmission device according to the embodiment of the present invention.

Wherein: 1-an output hub; 2-a stop ring; 3-a coil spring; 4-a retainer ring; 6-thrust ball bearing; 7-a hub; 8-thrust ball bearing; 10-an output hub; 20-an elastic member; 21-a first axial end face; 22-second axial end face; 30-a boss; 40-thrust ball bearing; 50-thrust ball bearing; 60-hub.

Detailed Description

As known from the background art, the power transmission device is complicated to install and has a high cost.

The reason why the power transmission device is complicated to install and high in cost is analyzed with reference to fig. 1 and 2.

Referring to fig. 1 and 2, fig. 1 is a partial sectional view of a power transmission device; fig. 2 is another partial schematic view of the power transmission device of fig. 1.

As shown in the drawings, taking a dual clutch as an example, a power transmission device includes: the output hub comprises an output hub 1 and a hub 7, wherein the spline of the output hub 1 is used for connecting a transmission input shaft, and a thrust ball bearing 6 and a thrust ball bearing 8 for bearing axial loads are respectively arranged between the output hub 1 and the hub 7 and between the hub 7 and a transmission disc. The output hub 1 is internally provided with an axial pretension assembly for providing axial force to the thrust ball bearings 6, 8, comprising a stop ring 2, a coil spring 3 and a retainer ring 4, when the power transmission device is assembled to a transmission, the transmission input shaft will contact the stop ring 2, and then the coil spring 3 will be compressed to provide a pretension force to compress the thrust ball bearings.

When the axial pre-tightening assembly is installed, the stop ring 2 needs to be assembled firstly, then the coil spring 3 needs to be assembled, and finally the retainer ring 4 needs to be installed, namely the three parts of the stop ring 2, the coil spring 3 and the retainer ring 4 of the axial pre-tightening assembly are assembled separately, so that the assembly period is long and the assembly process is complex. Moreover, the retainer ring 4 and the stopper ring 2 are manufactured by a stamping process, which is expensive.

In order to reduce the cost of the power transmission device and simplify the installation of the power transmission device, the embodiment of the invention provides a power transmission device, and the technical solution in the embodiment of the invention will be clearly and completely described below with reference to the drawings in the embodiment of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the indication of the direction or the positional relationship referred to in the present specification is based on the direction or the positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and it is not intended to indicate or imply that the indicated device must have a specific direction, be configured in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 3 to 9, fig. 3 is a partial sectional view of a power transmission device according to an embodiment of the present invention; FIG. 4 is another partial schematic view of a power transmission device provided in accordance with an embodiment of the present invention; FIG. 5 is an enlarged partial schematic view of region A of FIG. 4; FIG. 6 is another partial schematic view of a power transmission device provided in accordance with an embodiment of the present invention; fig. 7 is a schematic structural view of an elastic member of the power transmission device according to the embodiment of the present invention; fig. 8 is a schematic end view of an elastic member of the power transmission device according to the embodiment of the present invention;

fig. 9 is a side view of an elastic member of the power transmission device according to the embodiment of the present invention.

As shown in the drawings, the power transmission device provided in the embodiment of the present invention includes:

the clutch comprises an output hub 10, wherein the output hub 10 is internally provided with protrusions 30 distributed circumferentially, the protrusion extending direction of each protrusion 30 faces to the center of the output hub, and the output hub 10 is suitable for being connected with an input shaft of a gearbox;

elastic component 20, whole be the loop configuration, coaxial set up in inside output wheel hub 10, elastic component 20 includes first axial terminal surface 21 and second axial terminal surface 22, first axial terminal surface 21 and second axial terminal surface 22 are the plane, first axial terminal surface 21 be suitable for the butt in bellying 30, second axial terminal surface 22 is suitable for the butt in the gearbox input shaft.

The protrusion 30 contacts with the first axial end surface of the elastic member 20, and serves to axially limit the elastic member 20. The shape of the protrusion 30 is not limited as long as it can function as a stopper elastic member 20. The raised portion 30 may be a unitary annular structure, although in other embodiments, the raised portion may be a circumferentially extending non-closed annular structure. The projection may be a plurality of projections spaced apart in the circumferential direction. As shown in fig. 4 and 5, in a specific embodiment, in order to reduce cost, the protrusions 30 may be provided as a plurality of protrusions distributed at intervals in the circumferential direction, the number of the protrusions may be at least 2, in order to ensure the contact stability between the end surface of the elastic member 20 and the protrusions 30 and avoid the eccentricity of the elastic member 20 during elastic deformation, the number of the protrusions 30 may be at least 3, and the protrusions 30 are uniformly distributed at intervals in the circumferential direction of the output hub 10.

The processing method of the convex portion is not limited. The protruding portion can be fixed inside the output hub in a welding or bonding mode, and the protruding portion can be further integrally formed with the output hub. In one embodiment, to reduce cost, the boss is machined by a cold working process. The cold working deformation resistance is large, and the hardness and strength of the boss can be improved by work hardening.

The first axial end face 21 and the second axial end face 22 of the elastic part 20 are both flat, which means that the contact between the elastic part 20 and the boss 30 and the input shaft of the gearbox are both surface contact, and by designing the end faces of the elastic part 20 into a planar structure, the contact area between the first axial end face 21 and the boss 30 and the contact area between the second axial end face 22 and the input shaft of the gearbox can be increased, so that the contact stability is improved.

The elastic member may be made of spring steel, rubber or plastic, and the material of the elastic member is not limited as long as the elastic member can elastically deform in the axial direction. In a specific embodiment, the material of the elastic member may be spring steel. The spring steel has excellent comprehensive properties such as mechanical properties (particularly elastic limit, strength limit and yield ratio), anti-elastic property, fatigue property, hardenability and physicochemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance and the like).

As shown in fig. 3, the embodiment of the present invention is described by taking a dual clutch as an example, and in other embodiments, the clutch may be a single clutch. The double clutch comprises an output hub 10 and a hub 60, wherein the spline of the output hub 10 is used for connecting a transmission input shaft, and a thrust ball bearing 40 and a thrust ball bearing 50 which are used for bearing axial loads are respectively arranged between the output hub 10 and the hub 60 and between the hub and a transmission disc. The output hub 10 is internally provided with an elastic member 20 for providing an axial force to the thrust ball bearing, and when the power transmission device is assembled to the transmission, the transmission input shaft will contact and compress the elastic member 20 to provide a preload force to press the thrust ball bearing.

When the clutch output hub 10 is mounted, the elastic member 20, which is of an annular structure as a whole, is coaxially arranged inside the clutch output hub 10, so that the first axial end surface 21 of the elastic member 20 abuts against the boss 30 of the output hub 10, and the second axial end surface 22 abuts against the input shaft of the transmission, and the thrust ball bearing is ensured to maintain an axial pre-tightening state by elastic deformation of the elastic member 20.

According to the power transmission device provided by the embodiment of the invention, as the first axial end surface and the second axial end surface are both planes, the contact area between the first axial end surface and the protruding part and the contact area between the second axial end surface and the input shaft of the gearbox can be increased, so that the contact stability is improved, the stable transmission of axial pre-tightening force is facilitated, the pre-tightening effect of the thrust ball bearing is improved, and the service life of the thrust ball bearing is prolonged. Furthermore, the elastic part is simple in structure and convenient to install, so that the assembly period of the low-power transmission device can be shortened, the elastic part is convenient to process, and the cost can be reduced.

In one embodiment, in combination with fig. 7-9, the elastic member 20 may have a spiral structure, i.e. the elastic member may be a wave spring, in order to improve the elastic deformation capability of the elastic member.

Further, the first axial end surface of the elastic member 20 may include coils of different diameters. Referring to fig. 7-9 in conjunction with fig. 6, the coils with different diameters mean that the first axial end face of the elastic member includes, in addition to the outermost coil, a coil with a diameter smaller than that of the outermost coil, and thus, by providing the coils with different diameters, the diameter selectable range of the elastic member 20 is increased, so that the protrusions 30 with different heights can be matched, the adaptability of the elastic member 20 is improved, further, when the protrusions abut against the coil with a smaller diameter, the elastic member can be in contact with the larger coil and the smaller coil at the same time, so that the contact area between the protrusions and the first axial end face of the elastic member is increased, and the contact between the protrusions and the elastic member can be more stable.

It will be readily appreciated that the output hub 10 may be splined to the transmission input shaft. In order to facilitate the processing of the output hub 10 and prevent the influence on the inside of the output hub 10 where the elastic member 20 is placed during the spline processing, the output hub 10 may be designed as a stepped hub (as shown by a dotted frame in fig. 6). The presence of the step makes it possible for the diameter of the transmission input shaft to be smaller than the maximum diameter of the elastic member 20 (i.e. the outermost coil diameter), and therefore, in order to ensure that the transmission input shaft can contact the elastic member 20, the second axial end surface 22 of the elastic member 20 may comprise coils of different diameters, similar to the first axial end surface of the elastic member, in a specific embodiment.

The coil diameter of the first axial end surface and the coil diameter of the second axial end surface may be the same or different, and it is only necessary to ensure that the first axial end surface can abut against the boss and the second axial end surface can abut against the transmission input shaft.

Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.