Screw rod structure of recirculating ball type steering gear

Abstract

The utility model discloses a lead screw structure of a recirculating ball type steering gear, and belongs to the field of recirculating ball type steering gears. Comprising a screw rod; the circulating ball assembly is arranged on the lead screw in a sleeving manner and is in threaded fit with the lead screw; a rocker arm shaft; an outer ring raceway is arranged on the inner wall of the bearing outer ring; a rolling body; a holder; wherein the end parts of the two ends of the screw rod are provided with inner ring raceways matched with the outer ring raceways, and the inner ring raceways and the screw rod are of an integrally formed structure; and the rolling body is positioned in the raceway of the outer ring raceway and the inner ring raceway. The lead screw structure of the recirculating ball type steering gear has the beneficial effects that installation is convenient, and the overall rigidity of the recirculating ball type steering gear is improved.

Description

Technical Field

[0001] The present application relates to the field of recirculating ball steering gears, and in particular to a recirculating ball steering gear lead screw structure. Background Art

[0002] With the rapid development of the automobile industry, the performance requirements of vehicle steering systems are increasing. As an important part of the vehicle steering system, the recirculating ball steering gear is based on the working principle of the recirculating ball and is mainly composed of a steering screw, a nut, a transmission pair, and a steering gear housing. Among them, the steering screw (screw), bearing, and nut are the core components of the steering gear, and the steering torque is transmitted through the relative rotation between them. The transmission pair is responsible for converting the rotation of the steering screw into the deflection of the wheel, thereby realizing the steering of the vehicle. Its performance is directly related to the vehicle's handling stability and driving safety.

[0003] Traditional recirculating ball steering gear screw and bearing components have certain problems in structural design and performance, such as insufficient rigidity, short service life, low power density, etc. These problems limit the improvement of the performance of the recirculating ball steering gear. Utility Model Content

[0004] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a recirculating ball steering gear screw structure, including:

[0006] Screw rod;

[0007] A recirculating ball assembly is sleeved on the screw rod and matched with the screw rod thread;

[0008] Rocker arm shaft;

[0009] The outer ring of the bearing has an outer ring raceway on the inner wall;

[0010] Rolling element;

[0011] Cage;

[0012] The ends of both ends of the screw rod have inner ring raceways matching with the outer ring raceways, and the inner ring raceways and the screw rod are an integrally formed structure; the rolling bodies are located in the raceways of the outer ring raceways and the inner ring raceways.

[0013] Furthermore, the inner ring raceway is arranged to be inclined.

[0014] Further, the central axis of the rolling body is defined as L1, the central axis of the screw rod is defined as L2, and the angle formed by the intersection of the extended lines of L1 and L2 is in the range of 10-45°.

[0015] Furthermore, the angle formed by the intersection of the extended lines of L1 and L2 is 45°.

[0016] Further, the circulating ball assembly comprises:

[0017] A steering nut is slidably mounted on the screw rod, and a channel is provided in the steering nut;

[0018] Steel balls are rolled in the channel;

[0019] The steel ball is located in the raceway of the screw rod and is rotationally matched with the screw rod.

[0020] Furthermore, a first locking tooth is provided on one end of the steering nut, a connecting block is provided on the rocker arm shaft, and a second locking tooth matched with the first locking tooth is provided on the connecting block.

[0021] The beneficial effects of the present application are: providing a recirculating ball steering gear screw rod structure; when processing the screw rod, the present application directly processes the inner raceway on the left and right ends of the screw rod, and forms it through high-precision integrated grinding. It improves the installation convenience, improves the overall rigidity, load-bearing capacity, life and power density of the recirculating ball steering gear, and improves the overall performance of the steering gear to adapt to a wider range of working conditions and to adapt to more purpose vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0023] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0024] In the attached picture:

[0025] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0026] Figure 2 yes Figure 1 Enlarged view of part A.

[0027] Reference numerals:

[0028] 1. Screw; 2. Bearing body; 3. Recirculating ball assembly; 4. Rocker shaft; 5. Bearing outer ring; 6. Rolling element; 7. Cage; 8. Outer ring raceway; 9. Inner ring raceway; 10. Steering nut; 11. Channel; 12. First latch tooth; 13. Connecting block; 14. Second latch tooth. DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0030] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0031] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0033] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] Reference Figure 1-2The screw rod structure of the recirculating ball steering gear includes a screw rod 1, a bearing body 2, a recirculating ball assembly 3, and a rocker shaft 4; both ends of the screw rod 1 are arranged in the bearing body 2, and the recirculating ball assembly 3 is sleeved on the screw rod 1 and slides with the screw rod 1 thread; the bearing body 2 includes a bearing outer ring 5, a rolling body 6, and a retainer 7; an outer ring raceway 8 is arranged on the inner wall of the bearing outer ring 5, and inner ring raceways 9 matching the outer ring raceway 8 are arranged on both ends of the screw rod 1, and the rolling body 6 is installed in the raceways of the outer ring raceway 8 and the inner ring raceway 9, and the retainer 7 is arranged on the rolling body 6. Among them, the inner ring raceway 9 and the screw rod 1 are an integrally formed structure. When processing the screw rod 1, the present application directly processes the inner ring raceway 9 on the left and right ends of the screw rod 1, and forms it through high-precision integrated grinding; thus, there is no need to process the inner ring of the bearing, which can save costs on the one hand, and process it in one step. Compared with the existing traditional scheme, it reduces the end face grinding, inner hole grinding and other processes of the bearing itself, greatly improves the processing convenience, and reduces the installation process of the inner ring of the bearing, reduces the press-fitting or hot-fitting, and the tooling and equipment brought by the press-fitting or hot-fitting, greatly improves the work efficiency; on the other hand, it increases the effective cross-sectional area of ​​the screw rod 1, enhances the rigidity of the screw rod 1 itself, and improves the contact angle to change and further enhance the axial rigidity of the system; compared with the traditional two sets of bearing installation and adjustment, it has higher precision performance, which is beneficial to the meshing accuracy of the subsequent sector gear motion pair, and reduces wear and noise. In addition, the structure adopted by the present application is more compact. Under the condition of improving the load-bearing capacity and the required rigidity, the overall steering gear transmission can be further topologically optimized, the volume can be further reduced, and the occupied space can be reduced.

[0035] The inner ring raceway 9 is tilted. Specifically, the central axis of the rolling element 6 is defined as L1, the central axis of the screw rod 1 is defined as L2, and the angle formed by the intersection of the extended lines of L1 and L2 is in the range of 10-45°. Specifically, the maximum angle formed by the intersection of the extended lines of L1 and L2 is 45°. Improving the traditional raceway contact angle can greatly improve the load-bearing capacity of the steering gear.

[0036] The circulating ball assembly 3 is in the prior art. Specifically, the circulating ball assembly 3 includes a steering nut 10 and a steel ball (not shown in the figure); the steering nut 10 is sleeved on the screw rod 1 and slides with the screw rod 1, and a channel 11 is opened in the steering nut 10, and the steel ball rolls in the channel 11, and the steel ball rolls with the raceway of the screw rod 1.

[0037] A first latching tooth 12 is provided on one end of the steering nut 10 , a connecting block 13 is provided on the rocker arm shaft 4 , and a second latching tooth 14 matched with the first latching tooth 12 is provided on the connecting block 13 .

[0038] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A recirculating ball steering gear screw structure, characterized in that: include: Screw rod; A circulating ball assembly is sleeved on the screw rod and matched with the screw rod thread; Rocker arm shaft; The outer ring of the bearing has an outer ring raceway on the inner wall; Rolling element; Cage; The ends of both ends of the screw rod have inner ring raceways matching the outer ring raceways, and the inner ring raceways and the screw rod are an integrally formed structure; the rolling body is located in the raceways of the outer ring raceways and the inner ring raceways.

2. The recirculating ball steering gear screw structure according to claim 1, characterized in that: The inner ring raceway is arranged to be inclined.

3. The recirculating ball steering gear screw structure according to claim 2 is characterized in that: The central axis of the rolling body is defined as L1, the central axis of the screw rod is defined as L2, and the angle formed by the intersection of the extended lines of L1 and L2 is in the range of 10-45°.

4. The recirculating ball steering gear screw structure according to claim 3 is characterized in that: The angle formed by the intersection of the extended lines of L1 and L2 is 45°.

5. The recirculating ball steering gear screw structure according to claim 1, characterized in that: The circulating ball assembly comprises: A steering nut is slidably mounted on the screw rod, and a channel is provided in the steering nut; A steel ball is arranged to roll in the channel; The steel ball is located in the raceway of the screw rod and is rotationally matched with the screw rod.

6. The recirculating ball steering gear screw structure according to claim 5, characterized in that: A first latching tooth is arranged on one end of the steering nut, a connecting block is arranged on the rocker arm shaft, and a second latching tooth matched with the first latching tooth is arranged on the connecting block.

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