Rear drive floating transmission assembly

Abstract

The utility model discloses rear drive floating gearbox assembly, including box assembly, gear, spline shaft and spline sleeve, spline shaft outer periphery is equipped with axial convex stripe, and spline sleeve inner wall is equipped with recess that cooperates with it, and the contact surface of convex stripe and recess is equipped with ball, and sliding friction is converted for rolling friction, and effectively reduce friction resistance and abrasion. The limiting portion that limiting ring and limiting cover plate constitute is fixed through both ends of spline sleeve. Limiting cover plate is connected accurately with spline shaft end portion through the structure with the positioning column and the positioning hole, and the connecting screw obtains the sustained pre -tightening force through the spring and the top plate structure of built -in, and the anti -loose is reliable. Spline sleeve is equipped with the oil -guide hole and the permeation oil seal that intercommunication recess, can realize the long -term automatic lubrication of ball. The chamfer that recess and spline sleeve end portion edge set up is convenient for assembly direction. The utility model has the advantages of small friction wear, reliable transmission, convenient dismounting and maintenance, good connection anti -loose performance and convenient assembly.

Description

Technical Field

[0001] This utility model belongs to the field of transmission technology, and particularly relates to a rear-drive floating transmission assembly. Background Technology

[0002] The transmission is one of the core components of a vehicle's drivetrain. Its main function is to adapt to the vehicle's driving needs under various road conditions, such as starting, acceleration, climbing, and high-speed driving, by changing the torque and speed output by the engine to meet actual driving requirements. For rear-wheel drive vehicles, the transmission is usually connected to the drive axle, and its structural compactness, transmission efficiency, and reliability have a significant impact on the overall vehicle performance. In traditional rear-wheel drive transmissions, power is often transmitted through the cooperation of a splined shaft and splined sleeve. However, in actual use, the sliding friction between the splined shaft and splined sleeve is relatively large, which easily leads to wear and requires replacement. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide a rear-drive floating gearbox assembly. By optimizing the mating structure of the spline pair, it effectively reduces sliding friction and wear, and enhances assembly convenience and connection reliability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The rear-drive floating gearbox assembly includes a housing assembly, on which gears are mounted. A splined shaft is mounted on the housing assembly via bearings. A splined sleeve is provided at the end of the splined shaft, and the splined sleeve meshes with the gears. The outer circumferential surface of the splined shaft has a convex rib extending along its axial direction. The inner wall of the splined sleeve has a groove that slides with the convex rib. Limiting parts are provided at both ends of the splined sleeve, which fix the splined sleeve to the outside of the splined shaft. The contact surface between the convex rib and the groove forms a friction surface. Ball bearings are provided on the friction surface, and the ball bearings roll in contact with the friction surface to reduce the sliding friction resistance between the splined sleeve and the splined shaft.

[0005] Furthermore, the limiting part includes a limiting ring and a limiting cover plate, which are respectively located at both ends of the spline sleeve. The limiting ring is fixedly connected to the protrusion, and the limiting cover plate is fixedly connected to the end of the spline shaft.

[0006] Furthermore, the end face of the splined shaft is provided with a threaded hole, the limiting cover is connected to the threaded hole by screws, the inner wall of the limiting cover is provided with a positioning post, the end face of the splined shaft is provided with a positioning hole that matches the position of the positioning post, and the positioning post is installed in the positioning hole.

[0007] Furthermore, a spring is provided inside the threaded hole, and the spring is connected to a top plate. The top plate abuts against the end of the screw to increase the preload of the screw.

[0008] Furthermore, the balls are located on the inner wall of the groove and roll against the surface of the convex strip. The spline sleeve is provided with an oil guide hole, which is connected to the groove and has a permeation oil seal to lubricate the balls.

[0009] Furthermore, the permeation oil seal is made of porous sintered metal or oil-resistant fiber material.

[0010] Furthermore, a first chamfer is provided at both ends of the groove.

[0011] Furthermore, a second chamfer is provided at the end of the spline sleeve between the first chamfer and the end of the spline sleeve.

[0012] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: 1. In this utility model, by setting balls on the friction surface between the convex strip of the spline shaft and the groove of the spline sleeve, the original sliding friction is transformed into rolling friction, thereby reducing the relative motion resistance between the spline sleeve and the spline shaft and effectively reducing friction and wear. 2. In this utility model, the limiting part composed of the limiting ring and the limiting cover plate stably fixes the spline sleeve to the outside of the spline shaft, preventing it from falling off, ensuring the reliability and stability of power transmission, and facilitating the disassembly and maintenance of the spline sleeve. 3. In this utility model, an oil guide hole and a permeation oil seal communicating with the groove are provided in the spline sleeve, which can continuously and slowly permeate lubricating oil into the ball friction pair, realize long-term effective automatic lubrication, and reduce the friction of the spline sleeve. 4. In this utility model, a spring and top plate structure are provided in the threaded hole at the end of the spline shaft to provide a continuous and adaptive preload force for the connecting screw, thereby enhancing the anti-loosening ability of the threaded connection. 5. In this utility model, a first chamfer is formed at the edge of the groove to create an assembly guide surface, which allows the spline sleeve to be more smoothly aligned and fitted into the spline shaft during installation, thereby improving assembly efficiency and reducing the risk of component damage due to misalignment. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the rear-drive floating gearbox assembly in this utility model; Figure 2 This is a schematic diagram of the rear-drive floating gearbox assembly in this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the spline shaft in this utility model; Figure 4 This is a schematic diagram of the spline shaft structure in this utility model; Figure 5 This is a schematic diagram of the cross-sectional structure of the spline sleeve in this utility model; Figure 6 This is a side view of the spline sleeve in this utility model; Figure 7 for Figure 3 Enlarged schematic diagram of a local structure at point A; Figure 8 for Figure 5 Enlarged schematic diagram of the local structure at point B.

[0014] In the diagram: 1-Box assembly; 2-Gear; 3-Splined shaft; 4-Splined sleeve; 5-Raised strip; 6-Groove; 7-Limiting part; 71-Limiting ring; 72-Limiting cover plate; 8-Ball; 9-Threaded hole; 10-Positioning pin; 11-Positioning hole; 12-Spring; 13-Top plate; 14-Oil guide hole; 15-Permeable oil seal; 16-First chamfer; 17-Second chamfer. Detailed Implementation

[0015] Example 1: like Figures 1 to 4 As shown, this utility model shows a rear-drive floating gearbox assembly. The rear-drive floating gearbox assembly includes a housing assembly 1, which serves as the support and sealing housing for the entire gearbox. Gears 2 for power transmission are mounted on its exterior. A splined shaft 3 is installed inside the housing assembly 1 via bearings, and both ends of the splined shaft 3 extend to the outside of the housing assembly 1.

[0016] The splined shaft 3 is fitted with a splined sleeve 4 at its end. The external teeth of the splined sleeve 4 mesh with the spur teeth of the gear 2, thereby realizing the transmission connection between the splined shaft 3 and the gear 2. The splined sleeve 4 can be replaced by disassembling it.

[0017] On the outer circumferential surface of the spline shaft 3, there are protrusions 5 extending along its axial direction. The number of protrusions 5 can be single, double, or multiple. Correspondingly, on the inner wall of the spline sleeve 4, there are grooves 6 that match the number and shape of the protrusions 5. The protrusions 5 and the grooves 6 are interlocked to form a sliding fit, allowing the spline sleeve 4 to slide along the protrusions 5 and be fitted onto the outside of the spline shaft 3. At the same time, the spline sleeve 4 can be rotated and limited by the cooperation between the protrusions 5 and the grooves 6, preventing the spline sleeve 4 from rotating along the spline shaft 3.

[0018] The spline sleeve 4 is provided with limiting parts 7 at both ends, which fix the spline sleeve 4 to the outside of the spline shaft 3. The limiting part 7 includes a limiting ring 71 and a limiting cover plate 72. The limiting ring 71 is sleeved on the spline shaft 3 and fixedly connected to the protrusion 5 by screws. The limiting cover plate 72 is installed at the end of the spline shaft 3 to close the other end of the spline sleeve 4. Through the cooperation of the limiting ring 71 and the limiting cover plate 72, the spline sleeve 4 is limited and prevented from falling off.

[0019] The end face of the splined shaft 3 is machined with a threaded hole 9, and the limiting cover plate 72 is provided with a mounting hole. The screw head passes through the mounting hole and locks into the threaded hole 9, thereby realizing the fixed connection between the limiting cover plate 72 and the splined shaft 3.

[0020] A positioning post 10 is provided on the inner wall of the limiting cover plate 72. A positioning hole 11 that precisely matches the position of the positioning post 10 is machined on the end face of the spline shaft 3. During installation, after the positioning post 10 is inserted into the positioning hole 11, the mounting hole can be aligned with the threaded hole 9. Then, the screw is installed to ensure that the circumferential positioning of the limiting cover plate 72 and the spline shaft 3 is accurate and to prevent misalignment during installation.

[0021] A spring 12 is installed inside the threaded hole 9. One end of the spring 12 is connected to the inner wall of the threaded hole 9, and the other end is connected to the top plate 13. When the screw is screwed in, its end presses against the top plate 13 and compresses the spring 12. The reaction force generated by the spring 12 provides the screw with a continuous and adaptive preload, which improves the screw's anti-loosening performance and provides a certain elastic buffer, effectively improving the connection reliability.

[0022] Example 2: As shown in the figure Figure 5 As shown, this embodiment improves the friction surface structure based on Embodiment 1.

[0023] The mating surfaces of the protrusion 5 and the groove 6 form the main friction surface. This solution installs a rolling friction mechanism on the friction surface to reduce the sliding friction resistance between the spline sleeve 4 and the spline shaft 3 when the spline sleeve 4 is installed.

[0024] Several balls 8 are installed on the bottom surface of the groove 6. The balls 8 are in direct contact with the surface of the protrusion 5 to form rolling contact. When the spline sleeve 4 needs to slide axially relative to the spline shaft 3, the traditional surface-to-surface sliding is converted into the rolling of the balls 8, thereby greatly reducing the coefficient of friction and wear.

[0025] The spline sleeve 4 has an oil guide hole 14 machined inside. One end of the oil guide hole 14 leads directly to the groove 6 area where the ball bearing 8 is installed, and the other end is connected to the external environment.

[0026] Inside the oil guide hole 14, a permeation oil seal 15 is installed. The function of the permeation oil seal 15 is to allow lubricating oil to slowly and continuously permeate into the working area of ​​the ball 8 in the groove 6 under capillary action, so as to achieve automatic lubrication of the ball 8, while effectively preventing larger contaminants from entering the precision friction pair in reverse.

[0027] The permeation seal 15 is preferably made of porous sintered metal or oil-resistant fiber material. Porous sintered metal has high strength and uniform pores, while oil-resistant fiber material has lower cost and better elasticity. Both can achieve controllable permeation function.

[0028] Example 3: like Figures 5 to 8 As shown, this embodiment further describes an optimized design that facilitates assembly and reduces stress concentration, based on embodiment one or two.

[0029] To facilitate the smooth guidance of the spline sleeve 4 onto the protrusion 5 of the spline shaft 3 during initial installation and to avoid edge jamming, a first chamfer 16 and a second chamfer 17 are machined at the edges of both ends of the groove 6 and at the connection. The first chamfer 16 and the second chamfer 17 form a guide slope, making the assembly smoother.

[0030] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A rear-drive floating gearbox assembly, comprising a housing assembly, wherein gears are externally mounted on the housing assembly, and a splined shaft is mounted on the housing assembly via bearings, characterized in that: The splined shaft has a splined sleeve at its end, which meshes with the gear. The outer circumferential surface of the splined shaft has a convex rib extending along its axial direction. The inner wall of the splined sleeve has a groove that slides with the convex rib. The two ends of the splined sleeve have limiting portions that fix the splined sleeve to the outside of the splined shaft. The contact surface between the convex rib and the groove forms a friction surface. The friction surface has balls that roll in contact with the friction surface to reduce the sliding friction resistance between the splined sleeve and the splined shaft.

2. The rear-drive floating gearbox assembly according to claim 1, characterized in that: The limiting part includes a limiting ring and a limiting cover plate. The limiting ring and the limiting cover plate are respectively disposed at both ends of the spline sleeve. The limiting ring is fixedly connected to the protrusion, and the limiting cover plate is fixedly connected to the end of the spline shaft.

3. The rear-drive floating gearbox assembly according to claim 2, characterized in that: The splined shaft has a threaded hole on its end face. The limiting cover is connected to the threaded hole by screws. The inner wall of the limiting cover is provided with a positioning post. The end face of the splined shaft is provided with a positioning hole that matches the position of the positioning post. The positioning post is installed in the positioning hole.

4. The rear-drive floating gearbox assembly according to claim 3, characterized in that: A spring is provided inside the threaded hole, and the spring is connected to a top plate. The top plate abuts against the end of the screw to increase the preload of the screw.

5. The rear-drive floating gearbox assembly according to claim 1, characterized in that: The ball bearing is disposed on the inner wall of the groove and rolls against the surface of the protrusion. The spline sleeve is provided with an oil guide hole, which communicates with the groove and is provided with a permeation oil seal to lubricate the ball bearing.

6. The rear-drive floating gearbox assembly according to claim 5, characterized in that: The permeation oil seal is made of porous sintered metal or oil-resistant fiber material.

7. The rear-drive floating gearbox assembly according to claim 1, characterized in that: The groove has a first chamfer at both ends of its edge.

8. The rear-drive floating gearbox assembly according to claim 7, characterized in that: The spline sleeve has a second chamfer at its end, located between the first chamfer.

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