A drive shaft assembly with transmission stability

Abstract

The utility model relates to the technical field of automobile drive shaft, disclose a kind of drive shaft assembly of transmission stability, including drive shaft body and the inner ball cage assembly connected to the one end of drive shaft body, inner ball cage assembly includes inner ball cage shell, end cap and the sliding type universal joint slidingly arranged in inner ball cage shell, end cap is connected to one end of inner ball cage shell, inner ball cage shell is equipped with the track for slidingly installing sliding type universal joint, end cap is equipped with the stop block for stopping sliding type universal joint and sliding off track, the stop block one side is equipped with the stop slope for stopping sliding type universal joint, and the other side of stop block and inner ball cage shell between abutment have the elastic buffer block of buffering.The utility model sets up the elastic buffer block between stop block and inner ball cage shell, effectively solve the vibration and noise problem caused by sliding type universal joint due to axial clearance and hit end cap, reduce the impact force and noise of metal rigid impact, improve transmission stability.

Description

Technical Field

[0001] This utility model relates to the field of automotive drive shaft technology, and more specifically, to a drive shaft assembly with stable transmission. Background Technology

[0002] The drive shaft assembly is a key component of the automotive transmission system, and its transmission smoothness directly affects the vehicle's NVH performance and service life. Existing sliding universal joint structures have inherent technical defects: under rapid acceleration, rapid deceleration, and complex road conditions, the internal sliding components, due to unavoidable transmission clearance and sudden load changes, will generate axial movement and violently impact the inner CV joint housing end cover, thereby causing impact noise and torque fluctuations, severely damaging transmission smoothness, and frequent hard impacts will also accelerate the damage of components. Utility Model Content

[0003] To address at least one of the aforementioned problems, this utility model provides a drive shaft assembly with stable transmission, comprising a drive shaft body and an inner ball cage assembly connected to one end of the drive shaft body. The inner ball cage assembly includes an inner ball cage housing, an end cap, and a sliding universal joint slidably disposed within the inner ball cage housing. The end cap is connected to one end of the inner ball cage housing. The inner ball cage housing is provided with a track for slidably mounting the sliding universal joint. The end cap is provided with a stop block for preventing the sliding universal joint from sliding out of the track. One side of the stop block is provided with a stop slope for stopping the sliding universal joint, and the other side of the stop block abuts against the inner ball cage housing with an elastic buffer block.

[0004] Optionally, the sliding universal joint is a three-ball pin universal joint, which includes a three-pin bracket and three needle roller bearings connected to the three-pin bracket. The three-pin bracket is connected to one end of the drive shaft body. The track has three sections, each corresponding to one of the needle roller bearings. The track includes two oppositely arranged track walls. The needle roller bearings are placed between the corresponding two track walls. The stop block is placed on the inner side of one end of the track wall. The buffer block abuts against the stop block and the track wall.

[0005] Optionally, the stop block has a mounting surface on the side away from the stop slope, and the buffer block is fixedly mounted on the mounting surface.

[0006] Optionally, the needle roller bearing has an arc-shaped outer ring, the track wall is a first arc-shaped concave surface corresponding to the arc-shaped outer ring, the mounting surface is a first arc-shaped convex surface, one side of the buffer block has a second arc-shaped convex surface corresponding to the first arc-shaped concave surface, and the other side of the buffer block has a second arc-shaped concave surface corresponding to the first arc-shaped convex surface.

[0007] Optionally, the buffer block is bonded and fixed to the mounting surface by an elastic adhesive.

[0008] Optionally, the end cap has an inner edge, and the stop block is integrally connected to the inner edge and extends toward one side of the sliding universal joint.

[0009] Optionally, one end of the inner ball cage shell is provided with a port, and one end of the buffer block is provided with a guide slope to facilitate the introduction of the ball into the port.

[0010] Optionally, one end of the inner ball cage shell is provided with an annular insertion post, and the end cover is provided with an insertion groove for corresponding insertion with the insertion post. The insertion groove is provided with an inner groove wall, the outer wall of the insertion post abuts against the inner groove wall, and the inner wall of the insertion post abuts against the buffer block.

[0011] Optionally, the buffer block is a thermoplastic polyurethane elastomer.

[0012] Compared to existing technologies, the transmission-stabilized drive shaft assembly of this invention effectively solves the vibration and noise problems caused by axial clearance impacting the end cover of the sliding universal joint by setting an elastic buffer block between the stop block and the inner ball cage housing. When the universal joint slides and impacts the stop slope, the impact energy is absorbed and buffered by the elastic deformation of the buffer block, reducing the impact force and noise of the hard metal impact and improving the smoothness of transmission. This structure also reduces the wear of the stop block and the housing, improving the reliability and service life of the drive shaft assembly under complex working conditions. Attached Figure Description

[0013] Figure 1 This is a perspective view of the drive shaft assembly with stable transmission according to this utility model;

[0014] Figure 2 This is a cross-sectional view of the drive shaft assembly for stable transmission according to this utility model;

[0015] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0016] Figure 4 This is a schematic diagram of the stop block portion of the drive shaft assembly for transmission stability according to this utility model;

[0017] Figure 5 This is a schematic diagram of the arc-shaped outer ring portion of the drive shaft assembly for stable transmission according to this utility model.

[0018] Figure 6 for Figure 5 Enlarged view of section B;

[0019] Figure 7 This is a schematic diagram of the structure of the drive shaft assembly end cover for stable transmission according to this utility model;

[0020] Figure 8 This is a schematic diagram of the structure of the inner ball cage housing of the drive shaft assembly with stable transmission according to this utility model;

[0021] The component names corresponding to the various reference numerals in the figure are as follows: 1 is the drive shaft body, 2 is the inner ball cage housing, 21 is the track, 211 is the track wall, 22 is the port, 23 is the plug-in post, 3 is the end cover, 31 is the stop block, 311 is the stop slope, 312 is the mounting surface, 32 is the inner edge, 33 is the plug-in groove, 331 is the inner groove wall, 4 is the sliding universal joint, 41 is the three-pin bracket, 42 is the needle roller bearing, 421 is the arc-shaped outer ring, 5 is the buffer block, 51 is the second arc-shaped convex surface, 52 is the second arc-shaped concave surface, and 53 is the guide slope. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] See Figures 1-6 This utility model provides a drive shaft assembly with stable transmission, including a drive shaft body 1 and an inner ball cage assembly connected to one end of the drive shaft body 1. The inner ball cage assembly includes an inner ball cage housing 2, an end cap 3, and a sliding universal joint 4 slidably disposed in the inner ball cage housing 2. The end cap 3 is connected to one end of the inner ball cage housing 2. The inner ball cage housing 2 is provided with a track 21 for slidingly installing the sliding universal joint 4. The end cap 3 is provided with a stop block 31 for stopping the sliding universal joint 4 from sliding out of the track 21. One side of the stop block 31 is provided with a stop inclined surface 311 for stopping the sliding universal joint 4. The other side of the stop block 31 abuts against the inner ball cage housing 2 with an elastic buffer block 5.

[0026] This utility model relates to a drive shaft assembly with stable transmission. By incorporating an elastic buffer block 5 between the stop block 31 and the inner ball cage housing 2, it effectively solves the vibration and noise problem caused by the axial clearance of the sliding universal joint 4 impacting the end cover 3. When the universal joint slides and impacts the stop slope 311, the impact energy is absorbed and buffered by the elastic deformation of the buffer block 5, reducing the impact force and noise of the hard metal impact and improving the smoothness of transmission. This structure also reduces the wear of the stop block 31 and the housing 2, improving the reliability and service life of the drive shaft assembly under complex working conditions.

[0027] See Figure 2 and Figure 5 The sliding universal joint 4 is a three-ball pin universal joint. The three-ball pin universal joint includes a three-pin frame 41 and three needle roller bearings 42 connected to the three-pin frame 41. The three-pin frame 41 is connected to one end of the drive shaft body 1. There are three tracks 21, which correspond one-to-one with the needle roller bearings 42. The track 21 includes two oppositely arranged track walls 211. The needle roller bearings 42 are placed between the corresponding two track walls 211. The stop block 31 is placed on the inner side of one end of the track wall 211. The buffer block 5 abuts against the stop block 31 and the track wall 211. By adding an elastic buffer block 5 between the track wall 211 of the inner ball cage housing 2 and the end cover stop block 31, the axial movement of the three-ball pin universal joint is buffered. When the vehicle accelerates or decelerates rapidly, causing the needle roller bearing 42 to slip at high speed and impact the stop slope 311, the buffer block 5 can effectively absorb the impact energy, converting the rigid collision into elastic damping, reducing the resulting impact noise and vibration, directly protecting the track wall 211 and the stop block 31, avoiding wear and deformation caused by frequent hard impacts, thereby improving the transmission smoothness and service life of the entire drive shaft assembly.

[0028] See Figure 6 and Figure 7 The stop block 31 has a mounting surface 312 on the side away from the stop slope 311, and the buffer block 5 is fixedly installed on the mounting surface 312. During installation, the buffer block 5 contacts the mounting surface 312, increasing the contact area between the two, so that when the needle roller bearing 42 hits the stop slope 311, the impact force can be more effectively transmitted through the stop block 31 to the buffer block 5 for absorption, thus enhancing the buffering effect.

[0029] See Figure 2 , Figure 3 and Figure 5The needle roller bearing 42 has an arc-shaped outer ring 421, the track wall 211 is a first arc-shaped concave surface corresponding to the arc-shaped outer ring 421, the mounting surface 312 is a first arc-shaped convex surface, one side of the buffer block 5 has a second arc-shaped convex surface 51 corresponding to the first arc-shaped concave surface, and the other side of the buffer block 5 has a second arc-shaped concave surface 52 corresponding to the first arc-shaped convex surface; through the cooperation of the arc-shaped curved surfaces, the efficient transmission and dispersion of impact force is achieved. When the needle roller bearing 42 impacts axially, the impact force is smoothly transmitted to the buffer block 5 through these multi-stage arc-shaped contact surfaces, avoiding stress concentration, allowing its elastic material to deform more evenly to absorb the impact, and improving the buffering efficiency.

[0030] See Figure 2 and Figure 3 The buffer block 5 is bonded and fixed to the mounting surface 312 with an elastic adhesive. This fixing method ensures that a strong and durable connection is formed between the buffer block 5 and the mounting surface 312 of the stop block 31. It can effectively prevent the buffer block 5 from shifting or falling off under frequent impact vibration, and ensure the stability and predictability of its deformation and energy absorption under force, thereby ensuring continuous and reliable buffering performance.

[0031] Specifically, elastic adhesives are special adhesives that maintain good flexibility and elastic modulus after curing, such as modified polyurethane adhesives, silicone adhesives, or high-performance rubber-based adhesives. The advantages of using elastic adhesives are as follows: First, the elastic buffer block 5 is an elastomer, while the stop block 31 is a rigid metal. The adhesive layer formed after curing is elastic and can deform synchronously with the buffer block, avoiding debonding due to stress concentration at the interface caused by sudden changes in stiffness. Second, the drive shaft operates under complex conditions, including continuous vibration, impact, and temperature variations. The excellent fatigue resistance and damping properties of the elastic adhesive can effectively absorb and disperse interface stress, ensuring the reliability of the bond under long-term alternating loads. Furthermore, the thermal expansion coefficients of metal and rubber differ significantly; the flexibility of the elastic adhesive layer can compensate for the dimensional differences caused by temperature changes, preventing thermal stress from damaging the bond.

[0032] See Figure 2 , Figure 5 , Figure 7 and Figure 8 The end cap 3 has an inner edge 32, and the stop block 31 is integrally connected to the inner edge 32 and extends toward one side of the sliding universal joint 4. The integrated design of the end cap 3 and the stop block 31 allows the stop block 31 to directly transmit the impact force to the buffer block 5 through its own slight elastic deformation when subjected to axial impact from the sliding universal joint 4. This causes the buffer block 5 to undergo compression deformation to absorb and dissipate the impact energy, thereby transforming the hard collision into a flexible buffer and reducing noise and vibration transmission.

[0033] See Figure 2 , Figure 3 and Figure 8The inner ball cage shell 2 has a port 22 at one end, and the buffer block 5 has a guide slope 53 at one end to facilitate the insertion of the port 22. The guide slope 53 at one end of the buffer block 5 cooperates with the port 22 of the inner ball cage shell 2, which can guide the buffer block 5 to smoothly and accurately enter the preset installation position during assembly. After installation, the buffer block 5 is in a slightly compressed state, ensuring that the buffer block 5 is always in contact with the track wall 211 and the mounting surface 312, thereby ensuring that it can stably play a buffering role in subsequent work.

[0034] See Figure 2 , Figure 3 , Figure 7 and Figure 8 The inner ball cage shell 2 has an annular insertion post 23 at one end, and the end cap 3 has an insertion groove 33 for corresponding insertion of the insertion post 23. The insertion groove 33 has an inner groove wall 331. The outer wall of the insertion post 23 abuts against the inner groove wall 331, and the inner wall of the insertion post 23 abuts against the buffer block 5. The mating structure of the insertion post 23 and the insertion groove 33 realizes the precise positioning and radial limiting of the inner ball cage shell 2 and the end cap 3. The inner wall of the insertion post 23 directly abuts against the buffer block 5, providing stable radial support for the buffer block 5, preventing it from shifting during operation, and maintaining its reliable buffering performance.

[0035] See Figure 2 and Figure 3 The buffer block 5 is made of thermoplastic polyurethane elastomer (TPU). TPU combines high elasticity, excellent resistance to compression set, and extremely high mechanical strength and wear resistance, enabling it to absorb impact energy more efficiently and rebound quickly, ensuring long-term stable buffering performance. Its good tolerance to oily environments and wide temperature ranges also significantly improves the reliability and service life of the buffer structure under complex working conditions.

[0036] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0037] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0039] In this disclosure, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature or in indirect contact with the first feature through an intermediate medium.

[0040] It should be noted that when a component is described as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is described as being "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A drive shaft assembly with stable transmission, characterized in that, The device includes a drive shaft body (1) and an inner ball cage assembly connected to one end of the drive shaft body (1). The inner ball cage assembly includes an inner ball cage housing (2), an end cap (3), and a sliding universal joint (4) slidably disposed within the inner ball cage housing (2). The end cap (3) is connected to one end of the inner ball cage housing (2). The inner ball cage housing (2) is provided with a track (21) for slidingly mounting the sliding universal joint (4). The end cap (3) is provided with a stop block (31) for preventing the sliding universal joint (4) from sliding out of the track (21). One side of the stop block (31) is provided with a stop inclined surface (311) for stopping the sliding universal joint (4). The other side of the stop block (31) abuts against the inner ball cage housing (2) with an elastic buffer block (5).

2. The drive shaft assembly with stable transmission according to claim 1, characterized in that, The sliding universal joint (4) is a three-ball pin universal joint. The three-ball pin universal joint includes a three-pin bracket (41) and three needle roller bearings (42) connected to the three-pin bracket (41). The three-pin bracket (41) is connected to one end of the drive shaft body (1). The track (21) has three sections, each corresponding to one of the needle roller bearings (42). The track (21) includes two oppositely arranged track walls (211). The needle roller bearings (42) are placed between the two corresponding track walls (211). The stop block (31) is placed on the inner side of one end of the track wall (211). The buffer block (5) abuts against the stop block (31) and the track wall (211).

3. The drive shaft assembly with stable transmission according to claim 2, characterized in that, The stop block (31) has a mounting surface (312) on the side away from the stop inclined surface (311), and the buffer block (5) is fixedly installed on the mounting surface (312).

4. The drive shaft assembly with stable transmission according to claim 3, characterized in that, The needle roller bearing (42) is provided with an arc-shaped outer ring (421), the track wall (211) is a first arc-shaped concave surface corresponding to the arc-shaped outer ring (421), the mounting surface (312) is a first arc-shaped convex surface, the buffer block (5) is provided with a second arc-shaped convex surface (51) on one side corresponding to the first arc-shaped concave surface, and the buffer block (5) is provided with a second arc-shaped concave surface (52) on the other side corresponding to the first arc-shaped convex surface.

5. The drive shaft assembly with stable transmission according to claim 3, characterized in that, The buffer block (5) is bonded and fixed to the mounting surface (312) by an elastic adhesive.

6. The drive shaft assembly with stable transmission according to claim 1, characterized in that, The end cap (3) has an inner edge (32), and the stop block (31) is integrally connected to the inner edge (32) and extends toward one side of the sliding universal joint (4).

7. The drive shaft assembly with stable transmission according to claim 1, characterized in that, The inner ball cage shell (2) has a port (22) at one end, and the buffer block (5) has a guide slope (53) at one end to facilitate the introduction of the port (22).

8. The drive shaft assembly with stable transmission according to claim 1, characterized in that, The inner ball cage shell (2) has an annular plug-in post (23) at one end, and the end cap (3) has a plug-in groove (33) for plugging into the plug-in post (23). The plug-in groove (33) has an inner groove wall (331). The outer wall of the plug-in post (23) abuts against the inner groove wall (331), and the inner wall of the plug-in post (23) abuts against the buffer block (5).

9. The drive shaft assembly with stable transmission according to any one of claims 1-8, characterized in that, The buffer block (5) is a thermoplastic polyurethane elastomer.

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