Novel torsion bar of automobile steering device
By using spline teeth and secondary teeth on the torsion rod of the automobile steering gear, the problem of low guidance error and low pass rate during the pressing process of the traditional torsion rod is solved, and an efficient and accurate pressing process is achieved, reducing the process And reduce costs.
Patent Information
- Application Number
- CN202420024110.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-05
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-01-05
AI Technical Summary
During the pressing process of traditional automotive steering wheel torsion bars, there are guidance errors, low pass rate, difficult to guarantee accuracy, and there are many assembly processes, which affect the economics of the product.
The spline tooth structure of guide cylinder and shaft mating hole is adopted. Through the spline tooth and secondary tooth design of the inclined surface, the interference coordination between the torsion rod and the shaft is achieved, reducing barriers and improving installation smoothness, canceling the pounding method to ensure the same Axiality and accuracy.
It improves the pressing efficiency and pass rate, reduces the process, ensures the coaxial accuracy of the torsion bar and the shaft, reduces the scrap rate and cost of the workpiece, and improves the economics of the product.
Smart Images
Figure CN222116911U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile steering gears, in particular to a novel automobile steering gear torsion bar in an automobile power steering system. Background Art
[0002] In the power steering system of automobiles, the torsion bar is basically required. The matching hole between the press-fit outer cylindrical surface of the traditional torsion bar and the shaft rod is a small interference fit, such as Figure 1 and Figure 2 as well as Figure 3 As shown, Figure 1 This is a schematic diagram of the existing torsion bar installation. Figure 2 This is an enlarged schematic diagram of point A. Figure 3 This is the schematic diagram after installation. Figure 2 The front end chamfer of the torsion bar is used as a guide. The torsion bar is pressed into the matching hole with a press-fitting tool, and then drilled, reamed and pinned. The details are as follows: The guide structure of the torsion bar of the traditional power steering device is a press-fit outer cylindrical front end guide chamfer. Its length is short, and the guide part cannot be inserted into the matching hole of the shaft rod as a whole. Therefore, it is necessary to use the hammering method to manually hammer it in to play its guiding role. In this process, a slight error will cause the traditional torsion bar axis to form an angle with the shaft rod axis during the subsequent press-fitting tool to press the traditional torsion bar into the shaft rod, making The traditional torsion bar is actually pressed into the shaft at an angle. The press-fitting aid has not reached the shaft limit, but the maximum pressure of the press has been reached. The load-bearing end face of the traditional torsion bar is also swollen and crushed by the press-fitting aid. At this time, the traditional torsion bar and the shaft can only be scrapped. Moreover, among the parts that have been pressed, some of the coaxiality accuracy will be relatively poor, and the quality consistency of the parts cannot be guaranteed. After the torsion bar is pressed in, it is necessary to drill, ream, and press in cylindrical pins to obtain sufficient reliability, which ultimately leads to the axial dimension not being pressed into place, resulting in a low pass rate and difficulty in ensuring accuracy. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a novel automobile steering gear torsion bar to solve the problems of guidance, qualification rate and precision of press-fitting, reduce the procedures and parts required for torsion bar assembly, and improve the economic efficiency of the product.
[0004] In order to solve the above problems, the utility model adopts the following technical solutions:
[0005] A novel automobile steering gear torsion bar comprises a torsion bar and a shaft rod, wherein the shaft rod is provided with a shaft rod matching hole, the end of the torsion bar is also connected to a guide cylinder, the outer circumference of the guide cylinder is evenly distributed with spline teeth, and the end of the torsion bar is connected to the shaft rod matching hole on the shaft rod through an interference fit through the spline teeth.
[0006] A further technical solution is that the upper and lower ends of the spline teeth are both inclined surfaces. The setting of the inclined surfaces can place the guide cylinder together with the spline teeth in the shaft matching hole in the shaft, making insertion and extraction smoother and reducing obstruction. The inclination direction of the inclined surface is downward at the upper end of the spline teeth and upward at the lower end of the spline teeth.
[0007] A further technical solution is that auxiliary teeth are evenly distributed on the guide cylinder and on the outer circumference of the spline teeth, which can increase the strength of the spline teeth.
[0008] A further technical solution is that the tooth height of the auxiliary teeth is lower than the tooth height of the spline teeth, the number of auxiliary teeth is consistent with the number of spline teeth and is connected to the spline teeth, the clearance between the auxiliary teeth and the matching holes of the shaft rod is matched, which will not affect the insertion of the spline teeth, and can be more effectively positioned and installed compared with a guide cylinder without auxiliary teeth.
[0009] The beneficial effects of the utility model are:
[0010] 1. This torsion bar structure changes the guide chamfer into a guide cylinder, and uses the spline teeth distributed on the outer circumference of the guide cylinder to connect with the shaft rod matching hole through interference fit. The guide cylinder together with the spline teeth can be pressed into the shaft rod matching hole, without the need to use the hammering method to tap and roughly align, which improves the press-fitting efficiency;
[0011] 2. The guide cylinder of the torsion bar of this structure can ensure the coaxiality of the torsion bar and the shaft rod by manually inserting it into the matching hole and pressing it, eliminating the manual debugging and hammering steps, reducing the human unstable factors, improving the qualified rate of torsion bar press-fitting, and reducing the scrap rate of workpieces;
[0012] 3. The guide cylinder and the shaft rod matching hole of this structure torsion bar are clearance matched, and the length of the guide cylinder is long enough to ensure that the torsion bar and the shaft rod are basically coaxial after the guide cylinder is inserted into the matching hole. The hole-shaft matching can be self-centering and pressed into the designed axial size during the press-fitting process. After pressing, the coaxiality of the torsion bar and the shaft rod can be guaranteed to be within 0.2, and the press-fitting accuracy is high;
[0013] 4. The spline teeth of the torsion bar of this structure have been heat treated and have high hardness. Compared with the traditional structure torsion bar, a larger interference fit can be adopted without crushing the torsion bar. Therefore, the force required to pull out the torsion bar after the press-fitting is completed is greater, and it has sufficient reliability. The drilling and pinning process can be eliminated, saving process costs and material costs, and having better economy. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for 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.
[0015] Figure 1 This is a schematic diagram of the installation of a torsion bar of an existing automobile steering gear;
[0016] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;
[0017] Figure 3 This is a schematic diagram of the torsion bar of the steering gear of an existing automobile after installation;
[0018] Figure 4 This is a schematic diagram of a novel automobile steering gear torsion bar of the utility model;
[0019] Figure 5 For this utility model Figure 4 The enlarged schematic diagram at B in the middle;
[0020] Figure 6 This is a schematic diagram of a novel automobile steering gear torsion bar after installation.
[0021] Figure 1-6 Middle: 1-torsion bar, 2-shaft rod, 3-shaft rod matching hole, 4-spline teeth, 5-auxiliary teeth, 6-inclined surface, 7-guide cylinder. DETAILED DESCRIPTION
[0022] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0023] See also Figures 1 to 6 As shown, a new type of automobile steering torsion bar includes a torsion bar 1 and a shaft rod 2. The shaft rod 2 is provided with a shaft rod matching hole 3. The end of the torsion bar 1 is also connected to a guide cylinder 7. The outer circumferential side of the guide cylinder 7 is evenly distributed with spline teeth 4. The end of the torsion bar 1 is connected to the shaft rod matching hole 3 on the shaft rod 2 through the spline teeth 4 through interference fit.
[0024] The upper and lower ends of the spline teeth 4 are both beveled surfaces 6. The setting of the beveled surfaces 6 can make the guide cylinder 7 and the spline teeth 4 in the shaft matching hole 3 in the shaft 2 smoother and less obstructed, whether it is inserted or pulled out, and the beveled surface 6 is inclined downward at the upper end of the spline teeth 4, and inclined upward at the lower end of the spline teeth 4. Auxiliary teeth 5 are evenly distributed on the guide cylinder 7 and on the outer circumference of the spline teeth 4 to increase the strength of the spline teeth 4. The tooth height of the auxiliary teeth 5 is lower than the tooth height of the spline teeth 4. The number of teeth of the auxiliary teeth 5 is consistent with that of the spline teeth 4 and is connected to the spline teeth 4. The clearance between the auxiliary teeth 5 and the shaft matching hole 3 will not affect the insertion of the spline teeth 4, and it can be more effectively positioned and installed compared with the guide cylinder 7 without auxiliary teeth 5.
[0025] In this embodiment, the front end of the press-fit outer cylinder is guided and chamfered as follows: Figure 2 As shown, the guide cylinder 7 is replaced Figure 5 As shown, the guide cylinder 7 and the shaft matching hole 3 of the shaft 3 are clearance-fitted, so that the guide cylinder 7 of the torsion bar 1 can be completely inserted into the shaft matching hole 3 of the shaft 2 with a small gap. It is only necessary to put the top end of the torsion bar 1 into the pressing aid 10, and insert the guide cylinder 7 into the shaft 2, and then the button press-fitting can be started. The press-fitting is completed at one time, eliminating the errors that may be caused by human factors, so that the accuracy and qualified rate of the components are guaranteed. At the same time, the spline teeth 4 of the torsion bar 1 are overheated, and the spline teeth 4 and the shaft matching hole 3 are interference-fitted, so that after being pressed into the shaft matching hole 3 of the shaft 3, sufficient reliability can be obtained, and there is no need to drill or reame holes or press in cylindrical pins, which saves time and material costs. The structure has a wide range of applications and can be used for electric pipe columns, circulating ball hydraulic power steering gears, circulating ball electric power steering gears, rack and pinion hydraulic power steering gears, rack and pinion electric power steering gears, etc. It meets the use requirements of all steering gear manufacturers and can be widely used in various automobile steering gear manufacturers.
[0026] The above is only a specific implementation of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model.
Claims
1. A novel automobile steering gear torsion bar, comprising a torsion bar and a shaft, wherein the shaft is provided with a shaft matching hole, characterized in that: The end of the torsion bar is also connected to a guide cylinder, and spline teeth are evenly distributed on the outer circumference of the guide cylinder. The end of the torsion bar is connected to the shaft rod matching hole on the shaft rod through the spline teeth through interference fit. The upper and lower ends of the spline teeth are both inclined surfaces. Auxiliary teeth are also evenly distributed on the guide cylinder and on the outer circumference of the spline teeth. The tooth height of the auxiliary teeth is lower than the tooth height of the spline teeth.