Telescopic driving half shaft

Abstract

The utility model provides a telescopic type driving half axle, relates to the technical field of automobile chassis suspensions, the telescopic type driving half axle comprises two fixed knots and an axial compensation mechanism, the fixed knots are arranged at two ends of the axial compensation mechanism and are in transmission connection with the axial compensation mechanism, and when the fixed knots rotate, the axial compensation mechanism is driven to generate axial displacement. Compared with a steering knuckle, the fixed knuckle has larger angle compensation, the two fixed knuckles are arranged, the angle compensation degree is further increased, the axial compensation can be increased through the axial compensation mechanism, and therefore large-angle and large-axial compensation of the driving half shaft can be achieved within a certain range.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile chassis suspension, in particular to a telescopic driving half shaft. Background Art

[0002] The drive axle is an important part in the automobile transmission system. It is the shaft that transmits torque between the gearbox reducer and the drive wheel.

[0003] The structure of the traditional drive half shaft is as follows Figure 1 As shown, a fixed joint is installed at one end, which can compensate for the steering angle generated by the vehicle suspension system during the movement process, without axial displacement, and can ensure the constant speed transmission of driving torque under different working angles; a mobile joint is installed at the other end, which can compensate for the steering angle and axial displacement generated by the vehicle suspension system during the movement process, and can be axially displaced, and can ensure the constant speed transmission of driving torque under different working angles. The fixed joint can achieve large angle compensation, but the mobile joint can only achieve small angle compensation, and the allowable compensation angle is only about half of the fixed joint, and the compensation in the axial direction is also very limited; during the movement of the vehicle, due to the bouncing of the suspension system and the different turning radius of the steering system, the driving half shaft is required to achieve large angle and large axial displacement compensation.

[0004] Therefore, how to achieve large-angle and large-axial compensation of the driving half-shaft within a certain range has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a telescopic driving half shaft to solve the technical problem that the driving half shaft in the prior art cannot achieve large angle and large axial compensation within a certain range.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a telescopic drive half-shaft, including two fixed joints and an axial compensation mechanism. The fixed joints are arranged at both ends of the axial compensation mechanism and are transmission connected to the axial compensation mechanism. When the fixed joints rotate, the axial compensation mechanism is driven to undergo axial displacement.

[0007] Preferably, the axial compensation mechanism is a ball screw mechanism.

[0008] Preferably, the ball screw mechanism includes a ball screw, a ball nut and a ball assembly, the ball screw includes two sections, the ball nut and the ball assembly are arranged at the connecting end of the ball screw, and are used to connect the two sections of the ball screw, and the free end of at least one section of the ball screw is rotatably connected to the fixed section.

[0009] Preferably, the ball assembly includes balls and a guide, the guide contains a guide channel, and when the ball screw rotates, the balls form a closed loop on the ball screw and the guide channel.

[0010] Preferably, the guide is mounted on the outer wall of the ball nut, and two ends are inserted into the interior of the ball nut.

[0011] Preferably, the axial compensation mechanism is a spline structure.

[0012] Preferably, the spline structure includes a spline shaft, a spline cap and a connecting rod, one end of the spline shaft is fixedly connected to the fixed node on one side, the other end of the spline shaft is a spline, the spline cap is provided with a spline hole adapted to the spline on the spline shaft, the connecting rod is fixedly arranged on the side of the spline cap opposite to the spline hole, and the connecting rod is fixedly connected to the fixed node on the other side.

[0013] Preferably, the spline hole is rectangular, elliptical or triangular.

[0014] The telescopic drive half shaft provided by the utility model has the following technical effects:

[0015] This telescopic drive half shaft is mainly composed of two fixed joints and an axial compensation mechanism. The two fixed joints are located at both ends of the axial compensation mechanism and are connected to the axial compensation mechanism in a transmission manner. When the fixed joints rotate, the axial compensation mechanism is driven to undergo axial displacement. Compared with the steering knuckle, the fixed joint of the utility model has a greater angle compensation and includes two, which further increases the degree of angle compensation. The axial compensation mechanism can increase the axial compensation, thereby enabling the drive half shaft to achieve large angle and large axial compensation within a certain range. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a driving half shaft in the prior art;

[0018] Figure 2 This is a schematic structural diagram of a telescopic drive half shaft embodiment 1 of the utility model;

[0019] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the ball screw mechanism of the telescopic drive half-axis;

[0020] Figure 4 yes Figure 3 Front view of the ball screw mechanism;

[0021] Figure 5 yes Figure 4 A transverse cross-sectional view of the ball screw mechanism;

[0022] Figure 6 This is a schematic structural diagram of Embodiment 2 of the telescopic drive half shaft of the utility model;

[0023] Figure 7 yes Figure 6 It is a structural schematic diagram of the spline structure of the telescopic drive half shaft.

[0024] in, Figure 1-Figure 7 :

[0025] 1. First fixed joint; 2. Second fixed joint; 3. Ball screw mechanism; 31. Ball nut; 32. Ball screw; 33. Ball; 34. Guide; 341. Guide channel; 4. Spline mechanism; 41. Spline shaft; 411. Spline; 42. Spline cap; 421. Spline hole; 43. Connecting rod. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0027] The following is combined with specific Figure 2-7 The technical solution of the utility model is described in detail with Examples 1-2.

[0028] The telescopic drive half shaft provided by the utility model is mainly composed of two fixed joints and an axial compensation mechanism. The two fixed joints are located at both ends of the axial compensation mechanism and are transmission-connected with the axial compensation mechanism. When the fixed joints rotate, the axial compensation mechanism is driven to undergo axial displacement. Compared with the steering knuckle, the fixed joint has a greater angle compensation and includes two of them, which further increases the degree of angle compensation. The axial compensation mechanism can increase the axial compensation, thereby enabling the drive half shaft to achieve large angle and large axial compensation within a certain range.

[0029] The fixed joint is a common structure in the prior art. For example, the patent named "driving half shaft" and the publication number "CN203937440U" discloses the structure of the fixed joint in detail. Therefore, the present utility model does not describe the structure of the fixed joint in detail.

[0030] It should be noted that the telescopic amount of the telescopic drive half-axle of the utility model has been verified at the limit of the whole vehicle, so the utility model does not make specific requirements for the limit.

[0031] Embodiment 1:

[0032] This embodiment provides a telescopic drive axle. Figure 2 As shown, the telescopic drive half shaft is mainly composed of two fixed joints and a ball screw mechanism 3. The two fixed joints are located at both ends of the ball screw mechanism 3 and are transmission-connected to the ball screw mechanism 3. The fixed joints are respectively a first fixed joint 1 and a second fixed joint 2. When at least one of the first fixed joint 1 and the second fixed joint 2 rotates, the ball screw mechanism 3 is driven to undergo axial displacement. When the ball screw mechanism 3 undergoes axial displacement, the telescopic drive half shaft can also undergo axial displacement, thereby achieving axial compensation for the telescopic drive half shaft.

[0033] Specifically, Figure 2-5 As shown, the ball screw mechanism 3 includes a ball screw 32, a ball nut 31 and a ball 33 assembly. The ball screw 32 of this embodiment includes two sections, namely a first ball screw 32 and a second ball screw 32. One end of the first ball screw 32 is rotatably connected to the first fixed section 1, and one end of the second ball screw 32 is fixedly connected to the second fixed section 2. The other end of the first ball screw 32 and the other end of the second ball screw 32 are connected through the ball nut 31 and the ball 33 assembly.

[0034] Alternatively, one end of the first ball screw 32 is fixedly connected to the first fixed joint 1, one end of the second ball screw 32 is rotationally connected to the second fixed joint 2, and the other end of the first ball screw 32 and the other end of the second ball screw 32 are connected through a ball nut 31 and a ball 33 assembly.

[0035] Alternatively, one end of the first ball screw 32 is rotationally connected to the first fixed joint 1, one end of the second ball screw 32 is rotationally connected to the second fixed joint 2, and the other end of the first ball screw 32 and the other end of the second ball screw 32 are connected through a ball nut 31 and a ball 33 assembly.

[0036] More specifically, Figure 3-5As shown, the ball 33 assembly includes a ball 33 and a guide 34. The guide 34 is preferably a gate-shaped structure with a hollow interior, that is, the guide 34 contains a guide channel 341. When the ball screw 32 rotates, the ball 33 forms a closed loop on the ball screw 32 and the guide channel 341. At this time, the ball nut 31 moves relative to the ball screw 32, thereby changing the distance between the first fixed section 1 and the second fixed section 2, thereby achieving the purpose of axial compensation.

[0037] like Figure 3 and Figure 4 As shown, the guide 34 is mounted on the outer wall of the ball nut 31 , and both ends are inserted into the interior of the ball nut 31 .

[0038] Embodiment 2:

[0039] This embodiment provides a telescopic drive axle. Figure 6 As shown, the telescopic drive half shaft is mainly composed of two fixed joints and a spline mechanism 4. The two fixed joints are located at both ends of the spline mechanism 4 and are fixedly connected to the spline mechanism 4. The fixed joints are respectively a first fixed joint 1 and a second fixed joint 2. When at least one of the first fixed joint 1 and the second fixed joint 2 rotates, the spline mechanism 4 is driven to undergo axial displacement. When the spline mechanism 4 undergoes axial displacement, the telescopic drive half shaft can also undergo axial displacement, thereby achieving axial compensation for the telescopic drive half shaft.

[0040] Specifically, Figure 6 and Figure 7 As shown, the spline 411 structure includes a spline shaft 41, a spline cap 42 and a connecting rod 43. One end of the spline shaft 41 is fixedly connected to the second fixed node 2, and the other end of the spline shaft 41 is a spline 411. The spline cap 42 is provided with a spline hole 421 adapted to the spline 411 on the spline shaft 41. The connecting rod 43 is fixedly arranged on the side of the spline cap 42 opposite to the spline hole 421, and the connecting rod 43 is fixedly connected to the first fixed node 1.

[0041] The spline hole 421 of the present embodiment is rectangular, elliptical or triangular, but is not limited to these shapes and may be other shapes. The present invention does not limit the shape of the spline hole 421 as long as it can transmit torque and allow axial sliding.

[0042] Compared with the ball screw mechanism 3 , the spline mechanism 4 of this embodiment has a larger circumferential clearance than the ball screw mechanism 3 , so the ball screw structure has the best NVH performance.

[0043] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0045] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A telescopic drive axle, characterized in that: It includes two fixed joints and an axial compensation mechanism, wherein the fixed joints are arranged at both ends of the axial compensation mechanism and are transmission-connected with the axial compensation mechanism, and when the fixed joints rotate, the axial compensation mechanism is driven to undergo axial displacement; The axial compensation mechanism is a ball screw mechanism; The ball screw mechanism includes a ball screw, a ball nut and a ball assembly. The ball screw includes two sections. The ball nut and the ball assembly are arranged at the connecting end of the ball screw and are used to connect the two sections of the ball screw. The free end of at least one section of the ball screw is rotatably connected to the fixed section.

2. The telescopic drive axle according to claim 1, characterized in that: The ball assembly includes balls and a guide, wherein the guide contains a guide channel. When the ball screw rotates, the balls form a closed loop on the ball screw and the guide channel.

3. The telescopic drive axle according to claim 2, characterized in that: The guide is mounted on the outer wall of the ball nut, and two ends thereof are inserted into the interior of the ball nut.

4. The telescopic drive axle according to claim 1, characterized in that: The axial compensation mechanism is a spline structure.

5. The telescopic drive half shaft according to claim 4, characterized in that: The spline structure includes a spline shaft, a spline cap and a connecting rod. One end of the spline shaft is fixedly connected to the fixed node on one side, and the other end of the spline shaft is a spline. The spline cap is provided with a spline hole adapted to the spline on the spline shaft. The connecting rod is fixedly arranged on the side of the spline cap opposite to the spline hole, and the connecting rod is fixedly connected to the fixed node on the other side.

6. The telescopic drive half shaft according to claim 5, characterized in that: The spline hole is rectangular, elliptical or triangular.

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