Retainer of fixed joint, fixed joint and vehicle
By installing sound-absorbing inserts on the side wall of the cage window of the fixed section, the problem of noise generated by the fixed section under the large angle of the low-speed wheel is solved, and the performance of the drive shaft NVH is optimized.
Patent Information
- Application Number
- CN202421501594.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-27
AI Technical Summary
Under the conditions of large rotation angles of low-speed wheels, the steel balls with fixed joints hit peripheral parts between the cage and the raceway to produce noise, affecting the NVH performance of the drive shaft.
A fixed section cage is designed to install sound-absorbing inserts on the window side wall of the cage main body, and the sound-absorbing and noise-absorbing material of the sound-absorbing insert is used to absorb sound-absorbing and noise-absorbing and reduce noise-absorbing collisions of the rolling elements.
The sound-absorbing insert buffers the energy absorption, reduces the noise of the rolling element and the window collision, and significantly optimizes the NVH performance of the drive shaft.
Smart Images
Figure CN222717310U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle drive shafts, in particular to a retaining frame of a fixed joint, a fixed joint and a vehicle. Background Art
[0002] The constant velocity drive shaft is one of the key components in the automotive transmission system used to transmit torque and rotational motion. This product is mostly used in passenger cars.
[0003] Constant velocity drive shafts are typically installed between the wheel hubs and the gearbox (or motor) of a car. They allow the torque of the gearbox (or motor) to be smoothly and reliably transmitted to the drive wheels of the car through the two constant velocity drive shafts on the left and right sides. They can also meet the steering requirements of the car and compensate for the suspension displacement generated during the car's driving process.
[0004] The universal joints at both ends of the constant velocity drive shaft are a fixed joint and a sliding joint, respectively connecting the vehicle wheel hub and the transmission (or motor). The fixed joint includes a cage and steel balls, with the steel balls installed within windows in the cage. The fixed joint is mounted on the wheel hub bearing via a mounting shaft. The ball cage housing of the fixed joint is positioned opposite the wheel hub bearing. The mounting shaft of the fixed joint transmits power to the wheel hub bearing, efficiently and stably transmitting torque to the wheel hub at a constant angular velocity under continuously changing sway angles to drive the wheel rotation.
[0005] During vehicle road testing, noise was observed at the wheel ends under low-speed, large-angle wheel steering conditions. This noise disappeared after the steering wheel was turned half a turn back. Analysis suggested that the steel balls in the retaining link were striking surrounding parts between the cage and raceway, causing the noise. While improvements to the cage and raceway dimensions and optimization of the lubricant viscosity parameters somewhat reduced the noise, it persisted. Further detailed analysis revealed that the steel balls in the retaining link were impacting the cage's window edge beam, generating impact noise. The NVH performance of the drive shaft was then optimized.
[0006] Therefore, how to provide a fixed-joint retainer to reduce noise pollution and optimize the NVH performance of the drive shaft is a technical problem that needs to be solved urgently by skilled technicians. Utility Model Content
[0007] In view of this, the present invention provides a retainer for a fixed section to reduce noise pollution and optimize the NVH performance of the drive shaft. Furthermore, the present invention also provides a fixed section and a vehicle having the aforementioned retainer for a fixed section.
[0008] To achieve the above objectives, the present invention provides the following technical solutions:
[0009] A retainer for a fixed joint, comprising:
[0010] The cage body is a circular ring structure and has multiple windows along its circumference for placing rolling elements;
[0011] The sound-absorbing insert is made of a sound-absorbing and noise-reducing material. The sound-absorbing insert is installed on the main body of the cage and located on the side wall of the cage body along the circumference of the window. The sound-absorbing insert is used to contact the rolling element.
[0012] Preferably, in the retainer of the fixed section described above, the sound-absorbing insert includes a buffer surface for contacting the rolling element, and the buffer surface has a buffer strip at least at the limiting point for contacting the rolling element, with a lubricating medium filling the space between adjacent buffer strips.
[0013] Preferably, in the retainer of the aforementioned fixed section, the cross-sectional dimension of the buffer band at the end near the buffer surface is larger than the cross-sectional dimension at the end away from the buffer surface.
[0014] Preferably, in the retainer of the aforementioned fixed section, the longitudinal cross-section of the buffer band is triangular or trapezoidal.
[0015] Preferably, in the retainer of the aforementioned fixed section, the sound-absorbing insert is bonded, thermally fixed, or magnetically attached to the side wall of the window of the retainer body.
[0016] Preferably, in the retainer of the aforementioned fixed section, the sound-absorbing insert is a polyester elastomer, a nylon energy-absorbing element, or a rubber elastomer.
[0017] Preferably, in the retainer of the aforementioned fixed section, one of the mounting surface of the sound-absorbing insert and the side wall of the window is provided with a protrusion, and the other is provided with a groove. The protrusion and the groove can be matched and positioned, and the mounting surface is used to fit against the side wall of the window. Preferably, in the retainer of the aforementioned fixed section, the curvature of the sound-absorbing insert is the same as the curvature of the side wall of the window.
[0018] and / or,
[0019] The thickness of the sound-absorbing insert along the radial direction of the cage body is the same as the thickness of the sidewall of the window along the radial direction of the cage body.
[0020] A fixed joint includes a cage and rolling elements, wherein the cage is any of the cages described above, and the rolling elements are capable of rolling within a window of the cage.
[0021] A vehicle includes a fixed section, wherein the fixed section is the fixed section described above.
[0022] The embodiment of the present invention discloses a fixed-joint retainer, in which a sound-absorbing insert is provided on the side wall of the window of the retainer body. The sound-absorbing and noise-reducing material of the sound-absorbing insert can be used to absorb and reduce the noise of the collision of the rolling body, thereby reducing the noise of the collision between the rolling body and the window, thereby optimizing the NVH performance of the drive shaft. Attached Figure Description
[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0024] Figure 1 It is a structural schematic diagram of the fixing joint disclosed in the embodiment of the present utility model;
[0025] Figure 2 This is a schematic diagram of the structure of the retainer of the fixed section disclosed in the embodiments of this utility model;
[0026] Figure 3 This is a front view of a retainer of a fixed section disclosed in an embodiment of the present utility model;
[0027] Figure 4 for Figure 3 A cross-sectional view along the AA direction;
[0028] Figure 5 for Figure 3 A partial enlarged view of B in the middle;
[0029] Figure 6 This is a partial exploded view of the retainer of the fixed section disclosed in the embodiments of this utility model;
[0030] Figure 7 This is a diagram showing the assembly relationship between the retainer and the rolling element of the fixed section disclosed in an embodiment of the present utility model;
[0031] Among them, 100 is the cage body, 200 is the sound-absorbing insert, 300 is the rolling element, 400 is the star sleeve, and 500 is the outer sleeve;
[0032] 101 is a window, 102 is a side wall, 201 is a buffer surface, 2011 is a buffer belt, and 202 is a mounting surface. Detailed Implementation
[0033] The utility model discloses a retaining frame for a fixed joint, which reduces noise pollution and optimizes the NVH performance of a drive shaft. In addition, the utility model also discloses a fixed joint and a vehicle having the retaining frame for the fixed joint.
[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.
[0036] The constant velocity drive shaft is one of the key components in the automotive transmission system used to transmit torque and rotational motion. This product is mostly used in passenger cars.
[0037] Constant velocity drive shafts are typically installed between the wheel hubs and the gearbox (or motor) of a car. They allow the torque of the gearbox (or motor) to be smoothly and reliably transmitted to the drive wheels of the car through the two constant velocity drive shafts on the left and right sides. They can also meet the steering requirements of the car and compensate for the suspension displacement generated during the car's driving process.
[0038] The universal joints at both ends of the constant velocity drive shaft are a fixed joint and a sliding joint, respectively connecting the vehicle wheel hub and the gearbox (or motor). For example, Figure 1 The fixed joint shown includes a cage body 100, rolling elements 300 (including but not limited to steel balls), a star-shaped sleeve 400, and an outer sleeve 500. The rolling elements 300 are mounted within a window in the cage body 100. The inner spherical surface of the outer sleeve 500 and the outer spherical surface of the cage body 100, as well as the inner spherical surface of the cage body 100 and the outer spherical surface of the star-shaped sleeve 400, together form the movement space of the rolling elements 300. The fixed joint is mounted on the wheel hub bearing via a mounting shaft. The ball cage housing of the fixed joint is positioned opposite to the wheel hub bearing. The mounting shaft of the fixed joint can transmit power to the wheel hub bearing, efficiently and stably transmitting torque to the wheel hub at a constant angular velocity under continuously changing sway angles to drive the wheel rotation.
[0039] During vehicle road testing, noise was observed at the wheel ends under low-speed, large-angle wheel steering conditions. This noise disappeared after the steering wheel was turned half a turn back. Analysis suggested that the steel balls in the retaining link were striking surrounding parts between the cage and raceway, causing the noise. While improvements to the cage and raceway dimensions and optimization of the lubricant viscosity parameters somewhat reduced the noise, it persisted. Further detailed analysis revealed that the steel balls in the retaining link were impacting the window beam of the cage, generating impact noise. Therefore, the NVH performance of the drive shaft was optimized.
[0040] Based on this, this application discloses a retainer for a fixed section, wherein a sound-absorbing insert is provided at the window of the retainer body to buffer and absorb energy from the collision between the rolling element and the window, thereby reducing the noise of the collision and optimizing the NVH performance of the drive shaft.
[0041] Combine Figures 2 to 7 As shown, the retainer of the fixed joint in the present application includes: a retainer body 100 and a sound absorbing insert 200.
[0042] The cage body 100 has a circular structure and multiple windows 101 along its circumference, which are used to house the rolling elements 300. The shape and size of the cage body 100 and the windows 101 in this application can be customized according to different needs. Figure 1 As shown, the window 101 of the cage body 100 in this application is a rectangular window that extends circumferentially along the cage body 100, and the top corners of the window are all provided with chamfers, and the rolling body 300 can move along the extension direction of the window 101.
[0043] The sound-absorbing insert 200 is made of sound-absorbing and noise-reducing material. It is installed on the cage body 100 and located on the side wall 102 of the window 101 along the circumference of the cage body 100. The sound-absorbing insert 200 is used to contact the rolling element 300. The material of the sound-absorbing insert 200 in this application only needs to be capable of absorbing energy from the impact of the rolling element 300. The connection method between the sound-absorbing insert 200 and the side wall 102 of the window 101 is not specifically limited.
[0044] When the ball cage in the fixed section is working at a large angle, the rolling element 300 is buffered by the added sound-absorbing insert 200 as it rolls within the window 101. Since the sound-absorbing insert 200 is made of sound-absorbing and noise-reducing material, it isolates the impact noise of the rolling element 300 from being transmitted to the cage body 100, and prevents the rolling element 300 from directly contacting the metal cage body 100 to avoid impact and noise.
[0045] The retainer of the fixed section disclosed in this application has a sound-absorbing insert 200 provided on the side wall 102 of the window 101 of the retainer body 100. The sound-absorbing and noise-reducing material of the sound-absorbing insert 200 can be used to absorb and reduce the noise of the collision between the rolling element 300 and the window 101, thereby optimizing the NVH performance of the drive shaft.
[0046] Combine Figure 3 and Figure 5As shown, the sound-absorbing insert 200 in the present application includes a buffer surface 201 for contacting the rolling body 300, and at least the limiting point (not shown in the figure) of the buffer surface 201 for contacting the rolling body 300 is provided with a buffer strip 2011, and the adjacent buffer strips 2011 are used to fill the lubricating medium.
[0047] By providing a buffer strip 2011 on the buffer surface 201 of the sound-absorbing insert 200, the rolling element 300 can first contact the buffer strip 2011 during movement. The buffering effect of the buffer strip 2011 can reduce the impact force of the rolling element 300 on the side wall 102 of the window 101.
[0048] The adjacent buffer strips 2011 are filled with a lubricating medium, including but not limited to lubricating oil, to lubricate the rolling elements 300 and improve the lubrication effect of the fixed joint. In an optional embodiment, there are multiple buffer strips 2011, and the spacing between adjacent buffer strips 2011 is the same.
[0049] In some embodiments, the rolling element 300 is a ball, and its contact with the sound-absorbing insert 200 is point contact. Therefore, the buffer strip 2011 can be provided only at the limiting point of the buffer surface 201. Of course, in other embodiments, the buffer strip 2011 can also be provided at other locations besides the limiting point.
[0050] In order to reduce the contact area between the rolling element 300 and the buffer strip 2011, and thus reduce the friction between the rolling element 300 and the buffer strip 2011, in some embodiments, the cross-sectional dimension of the buffer strip 2011 near the buffer surface 201 is larger than the cross-sectional dimension away from the buffer surface 201. Optionally, the dimension of the buffer strip 2011 gradually decreases from the end near the buffer surface 201 to the end away from the buffer surface 201.
[0051] The above-mentioned setting method can ensure the stability of the connection between the buffer belt 2011 and the buffer surface 201, and at the same time reduce the contact area between the buffer belt 2011 and the rolling body 300, thereby reducing the friction between the rolling body 300 and the buffer belt 2011, which is beneficial to reducing the wear of the rolling body 300 and ensuring the dimensional accuracy requirements of the fixed section.
[0052] For example, the longitudinal cross-section of the buffer strip 2011 is triangular or trapezoidal. It should be noted that the shape, size and number of the buffer strip 2011 can be selected according to different needs. In this article, the size of the buffer strip 2011 protruding from the buffer surface 201 is small, which ensures the strength of the buffer strip 2011, prevents the buffer strip 2011 from tilting, and ensures the movement trajectory of the rolling element 300.
[0053] It should be noted that the function of the buffer strip 2011 in this application is to buffer the impact of the rolling element 300 and reduce abnormal noise; in addition, it can gradually absorb the impact force when the cage body 100 is impacted by the rolling element 300, thereby increasing the service life of the cage body 100.
[0054] In some embodiments, the sound-absorbing insert 200 is bonded to the side wall 102 of the window 101 of the cage body 100. Because bonding assembly involves assembly errors, the bonding assembly of the sound-absorbing insert 200 and the cage body 100 can be performed after the cage body 100 has undergone carburizing and tempering. After the bonding has cured, it can be finished by grinding. This ensures that the external dimensions of the sound-absorbing insert 200 are consistent with the finished cage after grinding. Furthermore, it improves the bonding assembly efficiency of the sound-absorbing insert 200 and reduces labor costs and defective product disposal costs incurred in ensuring bonding assembly accuracy.
[0055] Those skilled in the art will understand that the connection between the sound-absorbing insert 200 and the cage body 100 can also be achieved through thermal fixing, i.e., the sound-absorbing insert 200 is machined into the side wall 102 of the window 101 of the metal cage body 100 by heating and cooling. Alternatively, the sound-absorbing insert 200 and the cage body 100 can be connected by magnetic attraction. Specifically, a magnet is provided on the cage body 100, and a magnetic attractor is integrally injection-molded into the sound-absorbing insert 200 to achieve the connection between the cage body 100 and the sound-absorbing insert 200. The side of the sound-absorbing insert 200 near the rolling element can isolate magnetism to avoid the magnet's influence on the rolling element.
[0056] In some embodiments, the sound-absorbing insert 200 is a polyester elastomer, a nylon energy-absorbing element, or a rubber elastomer. The material of the sound-absorbing insert 200 can be set according to different needs; any material that can achieve shock absorption and noise reduction against the impact of the rolling element 300 is within the protection scope.
[0057] See also Figure 6 As shown, the sound-absorbing insert 200 includes a buffer surface 201 and a mounting surface 202. The buffer surface 201 is used to contact the rolling element 300, and the mounting surface 202 is used to fit against the side wall 102 of the window 101. The connection between the mounting surface 202 and the side wall 102 is used to connect the sound-absorbing insert 200 and the cage body 100. In this paper, one of the mounting surface 202 and the side wall 102 of the window 101 is provided with a protrusion, and the other is provided with a groove that can be positioned in conjunction with the protrusion.
[0058] The positioning of the mounting surface 202 and the side wall 102 can be achieved through the positioning of the protrusions and grooves, thereby improving the accuracy of the installation of the sound-absorbing insert 200 at the window 101 of the cage body 100. The installation positions of the grooves and protrusions can be set according to different needs, and all are within the protection range.
[0059] In some embodiments, the curvature of the sound-absorbing insert 200 is the same as the curvature of the sidewall 102 of the window 101. For example... Figure 6 As shown, the sound absorbing insert 200 includes a straight section and a chamfered section, wherein the straight section fits in with the straight section of the side wall 102 of the window 101, and the chamfered section fits in with the chamfered portion of the end of the side wall 102. The aforementioned protrusions or grooves can be provided on the straight section.
[0060] In this application, the thickness of the sound-absorbing insert 200 along the radial direction of the cage body 100 is the same as the thickness of the side wall 102 of the window 101 along the radial direction of the cage body 100. By ensuring that the external dimensions of the sound-absorbing insert 200 are consistent with the finished cage, the sound-absorbing insert 200 can absorb the impact of the rolling element 300's movement without altering the original rolling element 300's motion trajectory. This avoids abnormal noise from the impact between the metal material of the rolling element 300 and the metal material of the side wall 102 of the window 101, further optimizing the NVH performance of the drive shaft.
[0061] In addition, the present application also discloses a fixing joint, including the fixing joint retaining frame disclosed in the above embodiment. Therefore, the fixing joint having the fixing joint retaining frame also has all the above technical effects, which will not be described one by one here.
[0062] Combine Figure 1 As shown, the sound-absorbing insert 200 is assembled in the window of the retainer body 100 and connected by bonding. At the same time, the inner spherical surface of the outer sleeve 500 and the outer spherical surface of the star-shaped sleeve 400 will clamp the sound-absorbing insert 200 between the two, forming a double insurance with the bonding process to prevent the sound-absorbing insert 200 from falling off.
[0063] In addition, even if the sound-absorbing insert 200 falls off, due to its large size and softer texture than steel, the fixed joint will push away or break the fallen sound-absorbing insert 200 when it moves, and no fine particles will be generated to hinder the movement of the rolling element 300 in the raceway. The fallen sound-absorbing insert 200 will not scratch or break the dust cover.
[0064] It should be noted that the type of fixed joint can be set according to different needs. The core of this application is to add a sound-absorbing insert 200 to the side wall 102 of the window 101 of the retaining frame body 100. Therefore, as long as the fixed joint meets the above design core, it is within the protection range.
[0065] In addition, this application also discloses a vehicle including the fixed section disclosed in the above embodiments. Therefore, the vehicle with the fixed section also has all the above-mentioned technical effects, which will not be described in detail here.
[0066] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0067] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A retainer for a fixed joint, characterized in that: include: A cage body, wherein the cage body is a circular ring structure and has a plurality of windows along its circumference, wherein the windows are used to place rolling elements; A sound absorbing insert is a structure of sound absorbing and noise reducing material, the sound absorbing insert is installed on the retaining frame body and is located on the side wall of the window along the circumference of the retaining frame body, and the sound absorbing insert is used to contact the rolling element.
2. The retaining frame of the fixed joint according to claim 1, characterized in that: The sound absorbing insert comprises a buffer surface for contacting the rolling element, at least a limit point of the buffer surface for contacting the rolling element is provided with a buffer zone, and adjacent buffer zones are filled with a lubricating medium.
3. The retaining frame of the fixed joint according to claim 2, characterized in that: The dimension of the cross section of the buffer belt at one end close to the buffer surface is greater than the dimension of the cross section of the end far from the buffer surface.
4. The retaining frame of the fixed joint according to claim 3, characterized in that: The longitudinal cross section of the buffer zone is triangular or trapezoidal.
5. The retaining frame of the fixing section according to any one of claims 1 to 4, characterized in that: The sound absorbing insert is bonded, thermally fixed or magnetically adsorbed to the side wall of the window of the retainer body.
6. The retaining frame of the fixed joint according to claim 5, characterized in that: The sound absorbing insert is a polyester elastomer, a nylon energy absorbing piece or a rubber elastic piece.
7. The retaining frame of the fixed joint according to claim 5, characterized in that: One of the mounting surface of the sound absorbing insert and the side wall of the window is provided with a convex point, and the other is provided with a groove. The convex point and the groove can be matched and positioned, and the mounting surface is used to fit with the side wall of the window.
8. The retaining frame of the fixing section according to any one of claims 1 to 4, characterized in that: The curvature of the sound absorbing insert is the same as the curvature of the side wall of the window; and / or, The thickness of the sound absorbing insert along the radial direction of the retainer body is the same as the thickness of the side wall of the window along the radial direction of the retainer body.
9. A fixed joint, characterized in that: include: A cage and a rolling element, wherein the cage is the cage according to any one of claims 1 to 8, and the rolling element can roll in a window of the cage.
10. A vehicle comprising a fixed joint, characterized in that: The fixing joint is the fixing joint as claimed in claim 9.