Steering gear assembly
By installing bushings or needle roller ball bearings on both sides of the meshing of the rack shaft and gear shaft, the problem of insufficient support for the independent steering rack is solved, achieving stable meshing and smooth movement, and improving the performance and lifespan of the steering gear assembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI TONGYU AUTOMOTIVE TECHNOLOGY CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-14
AI Technical Summary
Due to its compact structure and limited space, the independent steering rack cannot be supported by the traditional bearing-based support scheme. Furthermore, the different forces on the meshing sides result in a lack of stable support for the rack shaft when meshing with the gear shaft, affecting steering accuracy and stability.
Support members are provided on both sides where the rack shaft meshes with the gear shaft. The support members are bushing structures, semi-needle roller bearing structures and/or semi-ball bearing structures. They are sleeved on the rack shaft and allow sliding to form effective radial support. They are adapted to different stress conditions through heterogeneous design, and at the same time, the sliding cooperation with the rack shaft ensures that axial movement is not hindered.
It effectively resists radial forces, reduces rack shaft offset and vibration, ensures meshing stability, improves steering transmission accuracy and smoothness, adapts to space and travel requirements, and extends service life.
Smart Images
Figure CN224491199U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and more particularly to steering system components. Background Technology
[0002] In automotive steering systems, the steering gear assembly is the core component that enables vehicle steering. It converts the driver's steering input into wheel steering action through the meshing of the rack and pinion shafts. For independent steering racks, their structure has many limitations—short overall length, limited installation space, and the rack shaft needs to have a large axial travel to meet steering flexibility requirements. This poses a severe challenge to the support structure of the rack shaft.
[0003] Traditional rack support solutions often rely on bearings installed in the polished section of the rack for support. However, this approach is unsuitable for independent steering racks: firstly, the polished section of an independent steering rack is relatively short, making it difficult to accommodate traditional bearing structures; secondly, limited installation space restricts the placement of such support structures. In related technologies, some solutions only support the rack shaft through a rack support seat. However, this single support method cannot withstand the external force impact generated when the rack shaft meshes with the gear shaft during vehicle operation, easily leading to radial misalignment or vibration of the rack shaft, affecting steering accuracy and stability.
[0004] However, the inventors have discovered at least the following technical problems in the related technology: due to the compact structure and limited space of the independent steering rack, the traditional support scheme relying on the bearing of the polished rod cannot be arranged, and the different forces on both sides of the meshing result in the rack shaft lacking stable support in the critical area of meshing with the gear shaft. Utility Model Content
[0005] One object of this application is to provide a steering component that at least solves the above-mentioned problems.
[0006] To achieve the above objectives, some embodiments of this application provide a steering gear assembly, including:
[0007] The housing has a cavity extending along the axial direction and a first through hole perpendicular to the axial direction and connected to the cavity;
[0008] The rack shaft is located inside the cavity and can slide axially;
[0009] The gear shaft passes through the pre-drilled hole and meshes with the rack shaft;
[0010] A support member is located inside the cavity of the housing and is sleeved on the rack shaft, which can slide relative to the support member;
[0011] The rack shaft and the gear shaft are provided with support members on both sides where they mesh. The support members are bushing structures, semi-needle roller bearing structures and / or semi-ball bearing structures.
[0012] Compared with related technologies, the solution provided in this application provides a solution by setting support members (bushing structure, semi-needle roller bearing structure and / or semi-ball bearing structure) on both sides where the rack shaft meshes with the gear shaft. The support members are sleeved on the rack shaft and allow the rack shaft to slide relative to it. The support members on both sides form effective radial support for the tooth area of the rack shaft, which solves the problem of insufficient support in traditional solutions. In addition, the support members on both sides can be heterogeneous designs, which are more suitable for situations where the meshing sides are subjected to different forces. At the same time, the sliding fit between the support members and the rack shaft ensures that the axial movement of the rack shaft is not hindered, which is suitable for the space and travel requirements of independent steering racks. Attached Figure Description
[0013] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0014] Figure 1 This is a cross-sectional schematic diagram of the steering gear assembly provided in an embodiment of this disclosure;
[0015] Figure 2 This is a partial schematic diagram of a steering gear assembly provided in an embodiment of this disclosure;
[0016] Figure 3 This is an assembly diagram of the gear shaft, rack shaft, and support provided in the embodiments of this disclosure;
[0017] Figure 4 This is a schematic diagram of the structure of the first support member provided in the embodiment of this disclosure, which is a semi-needle roller bearing;
[0018] Figure 5 This is a structural schematic diagram from another perspective of the first support member provided in the embodiments of this disclosure, which is a semi-needle roller bearing;
[0019] Figure 6 This is a schematic diagram of the structure of the first support member provided in the embodiment of this disclosure, which is a semi-ball bearing;
[0020] Figure 7 This is a structural schematic diagram from another perspective of the first support member provided in the embodiments of this disclosure, which is a semi-ball bearing.
[0021] Figure label:
[0022] 10: Housing; 1011: First chamber; 1012: Second chamber; 1013: Third chamber; 20: Rack shaft; 30: Gear shaft; 401: First support member; 402: Second support member; 50: Support base; 60: Nut; 70: Elastic member; 100: Groove; 101: Boss. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0024] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.
[0025] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.
[0026] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.
[0027] Unless otherwise stated, the term "multiple" means two or more.
[0028] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.
[0029] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.
[0030] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.
[0031] Combination Figures 1 to 7 As shown, the steering gear assembly provided in this embodiment includes: a housing 10, a rack shaft 20, a gear shaft 30, and a support member. The housing 10 has a cavity extending axially and a first through hole perpendicular to the axial direction and connected to the cavity; the rack shaft 20 is disposed within the cavity and is slidable axially; the gear shaft 30 passes through the first through hole and meshes with the rack shaft 20; the support member is disposed within the cavity of the housing 10 and sleeved on the rack shaft 20, allowing the rack shaft 20 to slide relative to the support member; wherein, support members are provided on both sides of the rack shaft 20 meshing with the gear shaft 30, and the support members are bushing structures, semi-needle roller bearing structures, and / or semi-ball bearing structures.
[0032] In related technologies, independent steering racks are limited by structural features (e.g., short length, limited space, high travel requirements), and traditional support solutions using bearings on the rack's smooth shaft cannot be implemented. Relying solely on the rack support seat 50 makes it difficult to withstand external impacts and simultaneously meet the requirements for radial support and smooth axial movement.
[0033] The steering gear assembly provided in this embodiment of the present disclosure uses support members (bushing structure, semi-needle roller bearing structure and / or semi-ball bearing structure) on both sides where the rack shaft 20 meshes with the gear shaft 30. The support members are sleeved on the rack shaft 20 and allow the rack shaft 20 to slide relative to each other. The support members on both sides form effective radial support for the tooth area of the rack shaft 20, which solves the problem of insufficient support in the traditional solution. In addition, the support members on both sides can be of heterogeneous design, which is more suitable for situations where the meshing sides are subjected to different forces. At the same time, the sliding fit between the support members and the rack shaft 20 ensures that the axial movement of the rack shaft 20 is not hindered, which is suitable for the space and travel requirements of an independent steering rack.
[0034] In this embodiment, the support members on both sides of the meshing area of the rack shaft 20 and the gear shaft 30 can provide targeted radial support to the rack shaft 20 from both sides, effectively resisting the radial force generated when the gear shaft 30 meshes, reducing the offset and vibration of the rack shaft 20, ensuring stable meshing between the rack shaft 20 and the gear shaft 30, and improving steering transmission accuracy. Simultaneously, the sliding fit design between the support members and the rack shaft 20 allows the rack shaft 20 to slide smoothly along the axial direction, avoiding any obstruction to the axial movement of the rack shaft 20 by the support structure, ensuring smooth steering operation, and solving the problem of the difficulty in simultaneously achieving both "support stability" and "smooth sliding" in traditional support structures. Furthermore, the flexible selection of various support structure structures (bulbs, needle roller bearings, and ball bearings) can adapt to different support requirements according to actual working conditions (such as load size and sliding frequency), optimizing friction performance while ensuring support strength, reducing component wear, and extending the service life of the steering gear. That is, the two support members can be of different designs to better adapt to the different forces on both sides of the meshing gear shaft 30 and rack shaft 20.
[0035] Optionally, the cavity of the housing 10 is sequentially divided into a first chamber 1011, a second chamber 1012, and a third chamber 1013. The support member is installed in the second chamber 1012 of the housing 10 and is interference-fitted with the second chamber 1012. The cross-sectional area of the first chamber 1011 and the third chamber 1013 is larger than that of the second chamber 1012.
[0036] The interference fit between the support and the second chamber 1012 forms a firm installation relationship, effectively preventing the support from loosening or shifting in the cavity of the housing 10 due to vibration, impact or the force caused by the sliding of the rack shaft 20. This ensures that the support is always in the preset support position, stably providing support to the rack shaft 20 and guaranteeing the reliability of the support.
[0037] The design of the first chamber 1011 and the third chamber 1013 having a larger cross-sectional area than the second chamber 1012 allows for adaptation to the structural characteristics of the rack shaft 20 in different areas (e.g., the rack shaft 20 may require more space at both ends to accommodate the connecting structure or the stroke). While meeting the space requirements of the second chamber 1012 for the support installation, it also provides sufficient space for the axial sliding of the rack shaft 20, avoiding interference between the rack shaft 20 and the inner wall of the cavity of the housing 10, and ensuring the smooth sliding of the rack shaft 20.
[0038] This embodiment makes reasonable use of the internal space of the housing 10 by dividing the chambers differently. While meeting the installation stability of the support and the movement requirements of the rack shaft 20, it avoids the overall volume of the housing 10 being too large, which helps to achieve a compact design of the steering gear assembly.
[0039] Optionally, the two side supports at the meshing point of the rack shaft 20 and the gear shaft 30 are respectively the first support 401 and the second support 402, wherein the distance from the first support 401 to the steering gear tie rod is less than the distance from the second support 402 to the steering gear tie rod, and the second support 402 is a bushing structure.
[0040] In practical applications, when the rack shaft 20 meshes with the gear shaft 30, the force exerted by the tie rod and the stress on itself vary in different areas. If the support components on both sides adopt the same structure and are not arranged reasonably, it may result in insufficient support on the side closer to the tie rod due to the greater force, while the side farther from the tie rod may use a high-strength structure because it does not need to bear too much load, resulting in cost waste and affecting the overall adaptability of the support.
[0041] In this embodiment, the supports on both sides of the meshing point between the rack shaft 20 and the gear shaft 30 are a first support 401 (closer to the tie rod) and a second support 402 (further from the tie rod), with the second support 402 being a bushing structure. Since the force exerted by the tie rod is primarily transmitted to the area near the first support 401, this area experiences relatively higher stress and requires stronger support (this can be achieved by using a semi-ball bearing or semi-needle bearing structure in the first support 401). Conversely, the area further from the tie rod, where the second support 402 experiences lower stress, is adequately supported by a bushing structure. This arrangement ensures effective support for the rack shaft 20 while avoiding the increased cost associated with using high-strength bearings, achieving a reasonable balance between support performance and cost. Furthermore, this layout allows the two support members to be adapted to different structures based on the stress differences, ensuring balanced stress on the rack shaft 20 during axial sliding and improving the stability and economy of the steering assembly.
[0042] Optionally, the first support member 401 is a semi-ball bearing structure, a semi-needle roller bearing structure, or a bushing structure, and the first support member 401 abuts against the tooth back area of the rack shaft 20 to support the rack shaft 20.
[0043] The first support member 401 is a semi-ball bearing structure or a semi-needle roller bearing structure, and it abuts against the tooth back area of the rack shaft 20. The semi-ball bearing and semi-needle roller bearing have high load-bearing capacity and structural rigidity, which can effectively resist the radial force borne by the tooth back area of the rack shaft 20, reduce the deformation of the tooth back area, avoid the rack shaft 20 bending or offset due to excessive force, ensure stable meshing between the rack shaft 20 and the gear shaft 30, and improve the steering transmission accuracy.
[0044] Meanwhile, the structural characteristics of semi-ball bearings or semi-needle roller bearings make their contact method with the rack shaft 20 more suitable for the stress state of the tooth back area. By directly contacting the tooth back area, the load on the rack shaft 20 can be transmitted to the housing 10 more evenly, avoiding local stress concentration and extending the service life of the rack shaft 20.
[0045] In addition, semi-ball bearings or semi-needle roller bearings have higher load-bearing capacity and wear resistance, and can adapt to the larger loads on the support members near the tie rod side. Compared with ordinary bushing structures, they can withstand impact and wear better, extend the service life of the support members, and their abutment design with the tooth back area ensures effective support for the rack shaft 20, improving the overall structural reliability.
[0046] It should be noted that in this article, "the tooth back area of the rack shaft 20" refers to the area on the opposite side of the tooth surface of the rack shaft 20 that meshes with the gear shaft 30, that is, the part of the rack shaft 20 where no teeth are provided and the surface opposite to the tooth surface is located.
[0047] The tooth back area of the rack shaft 20 is a key part that bears the reverse support force when the rack shaft 20 meshes with the gear shaft 30. For example, when the gear shaft 30 meshes with the rack shaft 20 through its tooth surface and applies force, the tooth back area of the rack shaft 20 will be supported by the support member and the support seat 50 to balance the radial force generated by meshing and prevent the rack shaft 20 from being affected by force offset, thus ensuring meshing accuracy.
[0048] Optionally, the inner ring surface of the support is coated with a lubricating material.
[0049] Applying lubricating material to the inner ring surface of the support can significantly reduce the sliding friction between the support and the rack shaft 20, ensuring smoother axial movement of the rack shaft 20, avoiding jamming, and improving the smoothness of steering operation; at the same time, the lubricating material reduces direct friction and wear between the two, extending the service life of the support and the rack shaft 20.
[0050] For example, when the support is a bushing structure, the bushing structure is provided with a lubricating material, so that the bushing structure has a self-lubricating effect when sliding relative to the rack shaft 20.
[0051] The bushing structure incorporates lubricating material, achieving a self-lubricating effect. This design eliminates the need for regular lubrication, reducing maintenance costs. As the rack shaft 20 slides relative to the bushing, the lubricating material continuously provides lubrication, ensuring low friction and smooth movement of the rack shaft 20. This meets the requirements of independent steering racks for low maintenance and high mobility.
[0052] For example, when the support is a semi-ball bearing structure, especially when a semi-deep groove ball bearing is selected, the inner ring surface of the support is coated with a lubricating material so that the rack shaft 20 slides more smoothly and without jamming relative to the support.
[0053] Applying lubricating material to the inner ring surface of the semi-ball bearing can effectively reduce the sliding resistance between the bearing and the rack shaft 20, making the rack shaft 20 slide more smoothly relative to the support, avoiding jamming, ensuring the accuracy and response speed of steering operation, and improving the overall steering performance.
[0054] Optionally, the housing 10 is also provided with a second through hole; it also includes: a support 50, which passes through the second through hole and has one end in contact with the back of the rack shaft 20 to provide rigid support for the rack shaft 20; and a nut 60, which is threadedly connected to the second through hole of the housing 10 and abuts against the other end of the support 50 so that the support 50 abuts against the back of the rack shaft 20.
[0055] The support seat 50 provides targeted rigid support to the tooth back area of the rack shaft 20, which can effectively counteract the radial force generated on the rack shaft 20 when the gear shaft 30 is engaged, reduce the deformation of the rack shaft 20, avoid poor meshing between the gear and rack due to the offset of the rack shaft 20, and improve the accuracy of steering transmission. The nut 60 adjusts the tightening force of the support seat 50 through a threaded connection, which can not only ensure reliable contact between the support seat 50 and the rack shaft 20 and ensure stable support effect, but also adjust the tightening degree according to actual working conditions (such as clearance compensation after wear), enhancing the adaptability of the structure and the convenience of maintenance.
[0056] The cooperation between the support seat 50 and the nut 60 forms an additional support point independent of the two side supports. It works in conjunction with the original support to further optimize the force balance of the rack shaft 20, improve the load-bearing capacity and vibration resistance of the overall structure, and extend the service life of the steering gear assembly.
[0057] Optionally, at least one end of the support seat 50 that abuts against the nut 60 is provided with a groove 100; it also includes: an elastic member 70 disposed in the groove 100, the elastic member 70 being able to apply a clamping force to the support seat 50 through the elastic force generated by its own deformation, so that the support seat 50 abuts against the tooth back area of the rack shaft 20.
[0058] A groove 100 is provided at the abutment end of the support seat 50 and the nut 60, with an embedded elastic element 70 (such as a spring). After assembly, the elastic element 70 is in a compressed state. The elastic force of the elastic element 70 can automatically compensate for gaps caused by vibration, wear, or assembly errors, ensuring that the support seat 50 always fits tightly against the tooth back area of the rack shaft 20, maintaining stable support force, avoiding radial displacement of the rack shaft 20 caused by support loosening, and ensuring the meshing accuracy of the rack shaft 20 and the gear shaft 30. In addition, the deformation characteristics of the elastic element 70 can buffer vibration transmission, reduce the impact of vibration on the support structure during vehicle operation, reduce the wear rate of the support seat 50, the nut 60, and the rack shaft 20, and extend the service life of the components.
[0059] Compared to a rigid contact structure, the design using elastic element 70 eliminates the need for frequent manual adjustment of nut 60 to compensate for clearance, improving the maintenance convenience and long-term reliability of the steering gear assembly and ensuring the continuity and stability of the support effect.
[0060] For example, the elastic element 70 may be a spring, and after the support seat 50 and the nut 60 are assembled, the spring located in the groove 100 is in a compressed state so that the spring can apply a preload force to the support seat 50 by means of the elastic force generated by its own deformation after being compressed, so that the support seat 50 provides rigid support to the rack shaft 20.
[0061] At least one end of the support 50 that abuts against the nut 60 is provided with a groove 100. This can be understood as the end of the support 50 being provided with a groove 100, or the end of the nut 60 being provided with a groove 100, or both the ends of the support 50 and the nut 60 being provided with grooves 100, with the two grooves 100 being provided correspondingly to form a closed space, within which the elastic member 70 is located.
[0062] Optionally, along the axial direction of the spring, the bottom wall of the groove 100 is provided with a boss 101, and the spring is sleeved on the outside of the boss 101. The boss 101 limits the spring and prevents the spring compression path from deviating.
[0063] Optionally, along the radial direction of the cavity of the housing 10, the gear shaft 30 and the support seat 50 are located on both sides of the rack shaft 20 and are correspondingly arranged.
[0064] The gear shaft 30 and the support base 50 are located on both sides of the rack shaft 20 along the radial direction of the cavity of the housing 10 and are correspondingly arranged. This arrangement makes the meshing force of the gear shaft 30 on the rack shaft 20 in the radial direction symmetrically balanced with the supporting force of the support base 50. This can effectively counteract the radial force generated by the gear shaft 30 on the rack shaft 20 when it is meshing, avoid deformation of the rack shaft 20 due to excessive force on one side, and ensure the structural stability of the rack shaft 20.
[0065] The symmetrical and corresponding positioning ensures that the meshing between the rack shaft 20 and the gear shaft 30 is always in a precise state, reducing the change in meshing clearance caused by the offset of the rack shaft 20, improving the accuracy and reliability of the steering transmission, and making the steering operation more stable.
[0066] This embodiment reduces the wear of the rack shaft 20, gear shaft 30, and support seat 50 by balancing radial forces, thereby extending the service life of each component and improving the overall durability of the steering gear assembly.
[0067] Optionally, the rack shaft 20, the gear shaft 30, and the support base 50 are arranged axially perpendicular to each other.
[0068] Of the rack shaft 20, gear shaft 30, and support base 50, each pair is axially perpendicular to the other. This vertical arrangement clarifies the direction of force transmission, reduces force decomposition losses, and improves transmission efficiency. Simultaneously, the vertical arrangement ensures a vertical balance between the meshing force of the gear shaft 30 on the rack shaft 20 and the supporting force of the support base 50, preventing force offset due to angular deviations. This further guarantees the stability of the rack shaft 20, reduces wear caused by improper force application, and extends the service life of the steering gear assembly.
[0069] Optionally, the end shape of the support 50 is adapted to the shape of the tooth back area of the rack shaft 20.
[0070] The shape of the end of the support seat 50 is adapted to the shape of the tooth back area of the rack shaft 20, which can increase the contact area between the two, make the stress distribution more uniform, and reduce the risk of local wear and damage. At the same time, the close contact state ensures that the support seat 50 can stably apply support force to the rack shaft 20, avoid support failure due to poor contact, and improve support reliability.
[0071] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims, and the foregoing embodiments should be considered exemplary and non-limiting.
Claims
1. Steering gear assembly, including: The housing has a cavity extending along the axial direction and a first through hole perpendicular to the axial direction and connected to the cavity; The rack shaft is located inside the cavity and can slide axially; The gear shaft passes through the first through hole and meshes with the rack shaft; Its characteristic is that it further includes: A support member is located inside the cavity of the housing and is sleeved on the rack shaft, which can slide relative to the support member; The rack shaft and the gear shaft are provided with support members on both sides where they mesh. The support members are bushing structures, semi-needle roller bearing structures and / or semi-ball bearing structures.
2. The steering gear assembly according to claim 1, characterized in that, The cavity of the shell is divided into a first chamber, a second chamber and a third chamber in sequence. The support member is installed in the second chamber of the shell and is interference-fitted with the second chamber. The cross-sectional areas of the first and third chambers are both larger than that of the second chamber.
3. The steering gear assembly according to claim 1, characterized in that, The two side supports at the meshing point of the rack shaft and the gear shaft are the first support and the second support, respectively. The distance from the first support to the steering gear tie rod is less than the distance from the second support to the steering gear tie rod. The second support component is a bushing structure.
4. The steering gear assembly according to claim 3, characterized in that, The first support member is a semi-ball bearing structure, a semi-needle roller bearing structure, or a bushing structure, and the first support member abuts against the tooth back area of the rack shaft to support the rack shaft.
5. The steering gear assembly according to claim 1, characterized in that, The inner ring surface of the support is coated with lubricating material.
6. The steering gear assembly according to any one of claims 1 to 5, characterized in that, The casing also has a second through hole; it also includes: The support seat is inserted through the second through hole, and one end contacts the tooth back area of the rack shaft to provide rigid support for the rack shaft. The nut is threaded into the second through hole of the housing and abuts against the other end of the support, so that the support rests against the back of the rack shaft.
7. The steering gear assembly according to claim 6, characterized in that, At least one end of the support seat that abuts against the nut has a groove; it also includes: An elastic element is provided in the groove. The elastic element can apply a clamping force to the support seat through the elastic force generated by its own deformation, so that the support seat abuts against the tooth back area of the rack shaft.
8. The steering gear assembly according to claim 6, characterized in that, Along the radial direction of the housing cavity, the gear shaft and the support seat are located on both sides of the rack shaft and are correspondingly arranged.
9. The steering gear assembly according to claim 6, characterized in that, In the rack shaft, gear shaft, and support base, each pair of axes is arranged perpendicular to each other.
10. The steering gear assembly according to claim 6, characterized in that, The end shape of the support is adapted to the shape of the tooth back area of the rack shaft.