Flexible type selection assembling and pre-tightening adjusting mechanism for speed reducing mechanism of steering engine
By using rubber damping rings to match the meshing gap between the worm gear and worm in the speed reduction mechanism of the steering machine, the problem of mismatching preloading adjustment capability and actual needs is solved, the cost is reduced and the noise problem caused by wear is solved, and efficient preloading is achieved Performance and simple assembly process.
Patent Information
- Application Number
- CN202421352278.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-06-14
AI Technical Summary
The problem of the preloading adjustment capability of the existing steering gear reducer does not match the actual demand, resulting in too large friction torque or too large gap, resulting in noise and affecting driving steering assist. At the same time, traditional dimensional selection methods consume a lot of inspection and selection costs, and noise problems are prone to occur after wear.
A steering machine speed reduction mechanism including a servo case, rubber damping ring, rubber end cap, worm gear and worm gear is designed. By setting a rubber damping ring on the small end of the servo case, the inner diameter of the rubber damping ring and the meshing gap between the worm gear and worm gear and worm gear. Match, improve pre-tightening adjustment capability, and facilitate sealing and observation through the setting of the rubber end cap.
It improves the matching degree of preloading adjustment capability with actual needs, reduces the selection and adaptation costs, solves the noise problem caused by wear, and has a simple assembly process, low cost and excellent preloading performance.
Smart Images
Figure CN222458319U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steering systems, in particular to a steering gear speed reduction mechanism with flexible selection and assembly and pre-tightening adjustment mechanism. Background Art
[0002] At present, in the steering gear servo unit, there are two main solutions for controlling the clearance of the worm gear. One is through the preload adjustment structure, and the other is through the selection of the size of the worm gear and the servo housing.
[0003] There are two main common preload adjustment structures: one is to add a bushing to the worm bearing end, provide preload force to the worm gear structure through the elastic deformation of the bushing, and have a certain radial adjustment capability; the other is to use a bearing bracket, compression spring and adjustment screw and other structures to provide preload force to the worm gear structure.
[0004] The preload adjustment structure has the disadvantage that the preload adjustment capability does not match the actual demand. If the preload adjustment capability is too large, it will lead to excessive friction torque, and then lead to problems such as excessive moving force; if the preload adjustment capability is insufficient, it will lead to excessive worm gear clearance, and then generate noise and even insufficient power assistance, large fluctuations and other problems that affect driving steering assistance.
[0005] The method for selecting the size of the worm gear and servo housing is as follows: first measure the center distance of the servo housing and the size of the worm gear and worm gear, then match the sum of the size of the worm gear and worm gear with the center distance of the housing, and then select the appropriate worm gear and worm gear to assemble to the servo housing. In this way, the size of the worm gear and worm gear assembled in the servo housing just matches, solving the problem of worm gear and worm gear clearance.
[0006] However, this type of selection and assembly structure not only requires a 100% inspection of all housing and worm gear related dimensions, but also requires matching, which consumes a lot of inspection and selection costs; and after long-term operation, the worm gear will have gaps due to wear and tear, causing noise problems.
[0007] Therefore, it is necessary to design a steering gear reduction mechanism with flexible selection and assembly and preload adjustment mechanism to improve the matching degree between the preload adjustment capability and the actual preload requirement, save the selection and adaptation cost, and solve the noise problem caused by wear. Summary of the invention
[0008] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a steering gear reduction mechanism with flexible selection and assembly and a preload adjustment mechanism to improve the matching degree between the preload adjustment capability and the actual preload demand, save selection and adaptation costs, and solve the noise problem caused by wear.
[0009] In order to achieve the above-mentioned purpose, the utility model is a steering gear speed reduction mechanism with flexible selection, assembly and pre-tightening adjustment mechanism, comprising a servo housing, a rubber damping ring, a rubber end cover, a worm wheel and a worm. The worm wheel and the worm are installed in the servo housing, the worm wheel is meshed with the worm, a ball bearing is provided on the outer sleeve of the small end of the worm, a rubber damping ring is installed between the ball bearing and the servo housing, the inner diameter of the rubber damping ring matches the meshing clearance of the worm wheel and the worm, a rubber end cover is installed on the side of the servo housing close to the small end of the worm, the end of the rubber damping ring extends to the gap between the rubber end cover and the servo housing, a matching groove is provided on the contact surface between the rubber end cover and the rubber damping ring, the raised structure of the rubber damping ring is embedded in the matching groove, a sealing groove is provided on the contact surface between the servo housing and the rubber end cover, and the raised ring of the rubber end cover is embedded in the sealing groove.
[0010] The maximum value of the inner diameter of the rubber damping ring is the meshing clearance of the worm gear + 0.15 mm, and the minimum value of the inner diameter of the rubber damping ring is the meshing clearance of the worm gear + 0.01 mm.
[0011] The stiffness of the rubber damping ring is the ratio of the worm preload force F to the worm runout S.
[0012] The inner ring of the rubber damping ring matches with the ball bearing, and the outer ring of the rubber damping ring matches with the inner wall of the servo housing.
[0013] A limiting structure is provided at the contact position between the rubber end cover and the inner boss of the servo housing.
[0014] The rubber end cover comprises a metal frame and a rubber layer, wherein the rubber layer is coated outside the metal frame.
[0015] Compared with the prior art, the utility model sets a rubber damping ring at the small end of the worm of the servo housing to solve the noise problem caused by wear after durability; the rubber damping ring matches the meshing clearance of the worm gear, which improves the matching degree between the preload adjustment ability and the actual preload demand; only the rubber damping ring needs to be selected and adapted, saving the selection and adaptation costs; the setting of the rubber end cover is convenient for sealing and fixing, and also convenient for observing the movement and beating of the worm inside the housing during subsequent tests. The utility model has the advantages of simple assembly process operation, low cost and excellent preload performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Figure 2 It is a partial enlarged view of the utility model. DETAILED DESCRIPTION
[0018] The utility model is now further described with reference to the accompanying drawings.
[0019] See also Figure 1 , Figure 2 The utility model is a steering gear speed reduction mechanism with flexible selection, assembly and preload adjustment mechanism, including a servo housing, a rubber damping ring, a rubber end cover, a worm wheel and a worm. A worm wheel 3 and a worm 2 are installed in the servo housing 1. The worm wheel 3 is meshed with the worm 2. A ball bearing 4 is provided on the outer sleeve of the small end of the worm 2. A rubber damping ring 5 is installed between the ball bearing 4 and the servo housing 1. The inner diameter of the rubber damping ring 5 matches the meshing clearance of the worm wheel and worm, thereby improving the matching degree between the preload adjustment ability of the rubber damping ring 5 and the actual preload requirement. A rubber end cover 6 is installed on one side of the servo housing 1 close to the small end of the worm 2. The end of the rubber damping ring 5 extends to the gap between the rubber end cover 6 and the servo housing 1. A matching groove 61 is provided on the contact surface between the rubber end cover 6 and the rubber damping ring 5. The raised structure of the rubber damping ring 5 is embedded in the matching groove 61. A sealing groove 11 is provided on the contact surface between the servo housing 1 and the rubber end cover 6. The raised ring of the rubber end cover 6 is embedded in the sealing groove 11. The rubber end cover 6 and the servo housing 1 are interference fit to play a sealing role.
[0020] In order to ensure sufficient interference, the rubber damping ring 5 provides a suitable preload to compensate for the gap caused by wear and tear and solve the noise problem. The maximum inner diameter of the rubber damping ring 5 is the meshing clearance of the worm gear + 0.15mm, and the preload provided is 13N. The minimum inner diameter of the rubber damping ring 5 is the meshing clearance of the worm gear + 0.01mm, and the preload provided is 1N. The nominal inner diameter of the rubber damping ring 5 is the meshing clearance of the worm gear + 0.08mm, and the preload provided is 7N. The meshing clearance of the worm gear = , is the shell center distance, is the worm gear pitch circle, is the worm pitch circle, is the engagement angle of the worm gear.
[0021] If there is a serious noise problem or the steering gear has exceeded its after-sales life cycle, the clearance between the worm gear and the worm gear is too large, and the original rubber damping ring 5 cannot provide sufficient preload force, the problem can be solved by simply removing the rubber end cover 6 and replacing it with a suitable rubber damping ring 5. Compared with replacing a new steering gear, the cost is reduced.
[0022] The stiffness of the rubber damping ring 5 is the ratio of the worm preload force F to the worm runout S, that is, F / S. The worm preload force F and the worm runout S are obtained through CAE simulation calculation based on the relevant parameters of the steering gear reduction mechanism.
[0023] The inner ring of the rubber damping ring 5 matches with the ball bearing 4 , and the outer ring of the rubber damping ring 5 matches with the inner wall of the servo housing 1 .
[0024] A limiting structure 62 is provided at the contact position between the rubber end cover 6 and the inner boss of the servo housing 1 to achieve the limiting between the rubber end cover 6 and the servo housing 1 .
[0025] The rubber end cover 6 includes a metal frame and a rubber layer. The rubber layer is coated on the outside of the metal frame. The metal frame provides sufficient support, and the rubber layer plays a role of filling the gap.
[0026] The utility model only needs to measure the center distance of the servo housing and the size of the worm gear, and select an appropriate rubber damping ring 5 for installation according to the meshing clearance of the worm gear, the worm preload force F, and the worm runout S, thereby reducing the number of adapted parts and reducing costs; and because the rubber damping ring 5 can be adjusted according to the motor output torque and worm gear selection of different projects, the production line can be assembled with the same set of press-fitting tooling, without the need for running and debugging.
[0027] The rubber end cover 6 can be quickly disassembled and assembled. When the steering gear worm wheel 3 and worm 2 have relevant problems and need to be measured, there is no need to cut the servo housing 1. The rubber end cover 6 can be directly removed to observe the movement and beating of the worm inside the servo housing 1. After the observation is completed, since the servo housing 1 is not damaged, other related experiments can be carried out later.
[0028] The utility model sets a rubber damping ring at the small end of the worm of the servo housing to solve the noise problem caused by wear after durability; the rubber damping ring matches the meshing clearance of the worm gear, which improves the matching degree between the preload adjustment ability and the actual preload demand; only the rubber damping ring needs to be selected and adapted, saving the selection and adaptation costs; the setting of the rubber end cover is convenient for sealing and fixing, and also convenient for observing the movement and beating of the worm inside the housing during subsequent tests. The utility model has the advantages of simple assembly process operation, low cost and excellent preload performance.
Claims
1. A steering gear speed reduction mechanism with flexible selection, assembly and preload adjustment mechanism, comprising a servo housing, a rubber damping ring, a rubber end cover, a worm wheel and a worm, characterized in that: A worm wheel (3) and a worm (2) are installed in the servo housing (1). The worm wheel (3) meshes with the worm (2). A ball bearing (4) is provided on the outer sleeve of the small end of the worm (2). A rubber damping ring (5) is installed between the ball bearing (4) and the servo housing (1). The inner diameter of the rubber damping ring (5) matches the meshing clearance of the worm wheel and the worm. A rubber end cover (6) is installed on one side of the servo housing (1) close to the small end of the worm (2). The end of the rubber damping ring (5) extends to the gap between the rubber end cover (6) and the servo housing (1). A matching groove (61) is provided on the contact surface between the rubber end cover (6) and the rubber damping ring (5). The protruding structure of the rubber damping ring (5) is embedded in the matching groove (61). A sealing groove (11) is provided on the contact surface between the servo housing (1) and the rubber end cover (6). The protruding ring of the rubber end cover (6) is embedded in the sealing groove (11).
2. According to claim 1, a steering gear speed reduction mechanism flexible selection assembly and preload adjustment mechanism is characterized in that: The maximum value of the inner diameter of the rubber damping ring (5) is the meshing clearance of the worm gear + 0.15 mm, and the minimum value of the inner diameter of the rubber damping ring (5) is the meshing clearance of the worm gear + 0.01 mm.
3. According to claim 2, a steering gear speed reduction mechanism flexible selection assembly and preload adjustment mechanism is characterized in that: The stiffness of the rubber damping ring (5) is the ratio of the worm preload force F to the worm runout S.
4. According to claim 1, a steering gear speed reduction mechanism flexible selection assembly and preload adjustment mechanism is characterized by: The inner ring of the rubber damping ring (5) cooperates with the ball bearing (4), and the outer ring of the rubber damping ring (5) cooperates with the inner wall of the servo housing (1).
5. According to claim 1, a steering gear speed reduction mechanism flexible selection assembly and preload adjustment mechanism is characterized by: A limiting structure (62) is provided at the contact position between the rubber end cover (6) and the inner boss of the servo housing (1).
6. The steering gear speed reduction mechanism flexible selection assembly and preload adjustment mechanism according to claim 1, characterized in that: The rubber end cover (6) comprises a metal frame and a rubber layer, wherein the rubber layer is coated on the outside of the metal frame.