Roller pin type steering intermediate shaft assembly for commercial vehicle
By adopting a needle roller structure in the steering intermediate shaft for commercial vehicles, the problems of the wear and concave points of the steering intermediate shaft in the prior art are solved, and higher wear resistance and service life are achieved.
Patent Information
- Application Number
- CN202421625030.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The steering intermediate shaft of existing commercial vehicles is prone to wear and create concave points, resulting in abnormal noise and maintenance problems.
The needle roller steering intermediate shaft assembly is adopted. By installing multiple needle rollers between the spline sleeve and the spline shaft, the torque transmission and telescopic sliding are achieved by combining the needle rollers and the spline shaft and the spline sleeve.
It improves the wear resistance and service strength of the steering intermediate shaft, extends the service life, and reduces the repair rate and failure rate.
Smart Images
Figure CN222650348U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vehicle steering intermediate shafts, and in particular relates to a needle roller type steering intermediate shaft assembly for commercial vehicles. Background Art
[0002] Now, as commercial vehicles develop towards high-end and comfort, in order to reduce the bad feeling caused by vibration and turbulence to drivers and passengers, the cab basically adopts airbag suspension device. During the driving process of the vehicle, the cab always goes up and down to provide buffer for the driver. Such a solution requires that the steering intermediate shaft assembly in the steering transmission device must have a telescopic function to compensate for the change in the connection distance between the steering shaft and the steering machine caused by the ups and downs of the cab. Because the cab always goes up and down at a high frequency during the driving process of the vehicle, the steering intermediate shaft also has to be telescopic at a high frequency. For this reason, the telescopic spline pair of the steering intermediate shaft must have high wear resistance and strength to ensure that within a certain period of time, the gap will not increase due to the wear of the spline pair, resulting in abnormal noise, which will eventually lead to damage and repair.
[0003] In the prior art, the steering intermediate shaft structures used by all models are roughly divided into two categories. One is the traditional spline steering intermediate shaft, which directly achieves the purpose of transmitting torque and telescopic sliding by cooperating a spline sleeve with internal spline teeth and a spline shaft with external spline teeth. The other is a ball spline intermediate shaft, with a double arc raceway inside the spline sleeve and a spline shaft with a double arc raceway. The spline sleeve and the spline shaft are connected by steel balls to ensure that they can transmit torque and telescopic sliding.
[0004] In the first structure, since the internal and external splines are in direct contact, there is sliding friction between the contact surfaces during extension and retraction, the wear life of the spline pair is low, and it is easy to produce abnormal noise due to the increase in clearance. The second structure adopts a steel ball structure. The spline sleeve and the spline shaft are heat treated. There is rolling friction when the spline pair is extended and retracted. Compared with the first structure, it has a higher wear life and smaller sliding force. However, because the contact between the steel ball and the raceway is point contact, the contact stress is very large, which makes it easy for the raceway to produce dents during use. According to market feedback, the failure cause of this structure is mostly due to the dents in the raceway causing the steering wheel to shake and make abnormal noises. Utility Model Content
[0005] The purpose of the utility model is to:
[0006] In order to solve the problem that the existing commercial vehicle steering intermediate shaft is easy to wear and produce pits, a roller needle type steering intermediate shaft assembly for commercial vehicles is provided.
[0007] The technical solution adopted by the utility model is as follows:
[0008] A needle roller type steering intermediate shaft assembly for commercial vehicles comprises a spline sleeve with a cylindrical exterior, a spline shaft arranged inside the spline sleeve, the spline shaft being in the shape of a quadrangular prism, the surface of the spline shaft comprising four planes, arc transition surfaces being arranged between adjacent planes, the inner wall shape of the spline sleeve matching the spline shaft, a retaining frame being installed between the spline shaft and the spline sleeve, a plurality of needle rollers being installed on the retaining frame, the needle rollers being arranged between the spline shaft and the plane of the inner wall of the spline sleeve.
[0009] Furthermore, the retaining frame is provided with a plurality of mounting grooves for mounting needle rollers, the size of the needle rollers matches the size of the mounting grooves, and the needle rollers are rollingly connected to the mounting grooves.
[0010] Furthermore, a special-shaped retaining ring is connected to the end of the spline shaft.
[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0012] The utility model uses needle rollers for the telescopic spline pair of the steering intermediate shaft, and achieves the purpose of transmitting torque and telescopic sliding through the cooperation of the needle roller, the spline shaft and the spline sleeve. It has the same rolling friction as the ball-type intermediate shaft, and has a line contact strength higher than the point contact strength of the ball. Thereby improving the wear resistance and use strength of the steering intermediate shaft. The utility model greatly improves the service life of the steering intermediate shaft and reduces the repair rate and failure rate through the optimized design of the structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the utility model;
[0014] Figure 2 It is a cross-sectional view of the utility model.
[0015] Markings in the figure: 1-spline sleeve, 2-cage, 3-needle roller, 4-spline shaft, 5-special-shaped retaining ring. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.
[0017] A three-needle roller steering intermediate shaft assembly for commercial vehicles comprises a spline sleeve 1 with a cylindrical exterior, a spline shaft 4 arranged inside the spline sleeve 1, the spline shaft 4 being in the shape of a quadrangular prism, the surface of the spline shaft 4 comprising four planes, arc transition surfaces being arranged between adjacent planes, the inner wall shape of the spline sleeve 1 matching the spline shaft 4, a retainer 2 being installed between the spline shaft 4 and the spline sleeve 1, a plurality of needle rollers 3 being installed on the retainer 2, and the needle rollers 3 being arranged between the spline shaft 4 and the plane of the inner wall of the spline sleeve 1.
[0018] Furthermore, a plurality of mounting grooves for mounting the needle rollers 3 are formed on the retaining frame 2. The size of the needle rollers 3 matches the size of the mounting grooves, and the needle rollers 3 are rollingly connected to the mounting grooves.
[0019] Furthermore, a special-shaped retaining ring 5 is connected to the end of the spline shaft 4 .
[0020] like Figure 1-2 The utility model comprises a spline sleeve 1, a retaining frame 2, a needle roller 3, a spline shaft 4, and a special-shaped retaining ring 5.
[0021] The utility model adopts a needle roller 3 structure, the inner hole of the spline sleeve 1 is square, the spline shaft 4 is square outside, and the retainer 2 is designed to be square at the same time. Four rectangular holes are designed on each surface. The balls can be stuck in the holes and can roll freely. The four rows of needle rollers 3 are matched and connected with the four planes corresponding to the spline sleeve 1 and the spline shaft 4. There is line contact between the needle rollers 3 and the planes. The purpose of transmitting torque and telescopic sliding is achieved through the cooperation of the needle rollers 3, the spline shaft 4 and the spline sleeve 1, which greatly improves the contact strength and increases the wear life of the spline pair.
[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A needle roller steering intermediate shaft assembly for commercial vehicles, characterized in that: The invention comprises a spline sleeve (1) with a cylindrical exterior, a spline shaft (4) being arranged inside the spline sleeve (1), the spline shaft (4) being in the shape of a quadrangular prism, the surface of the spline shaft (4) comprising four planes, arc transition surfaces being arranged between adjacent planes, the inner wall shape of the spline sleeve (1) matching the spline shaft (4), a retaining frame (2) being installed between the spline shaft (4) and the spline sleeve (1), a plurality of needle rollers (3) being installed on the retaining frame (2), the needle rollers (3) being arranged between the spline shaft (4) and the plane of the inner wall of the spline sleeve (1).
2. The needle roller steering intermediate shaft assembly for commercial vehicles according to claim 1, characterized in that: The retaining frame (2) is provided with a plurality of mounting grooves for mounting needle rollers (3); the size of the needle rollers (3) matches the size of the mounting grooves; the needle rollers (3) are rollingly connected to the mounting grooves.
3. The roller-type steering intermediate shaft assembly for commercial vehicles according to claim 1, characterized in that: The end of the spline shaft (4) is connected with a special-shaped retaining ring (5).