Circulating ball mechanical steering gear adopting eccentric bevel gear rocker arm shaft

Abstract

The recirculating ball mechanical steering gear comprises a screw and nut assembly, a shell, the rocker arm shaft, two needle bearings, a steering vertical part, a side cover, an adjusting screw and a retainer, the rocker arm shaft is installed in the screw and nut assembly, the two needle bearings are located between the shell and the rocker arm shaft, the steering vertical part is located between the shell and the rocker arm shaft, and the retainer is located between the shell and the rocker arm shaft. The steering vertical arm is installed on the left side of the rocker arm shaft, the side cover is installed on the right side face of the shell, the adjusting screw is arranged in the side cover, and the retainer is installed between the adjusting screw and the rocker arm shaft. The rocker arm shaft is pushed to move through the adjusting screw, a gap generated by meshing of the sector teeth of the rocker arm shaft and the tooth surface of the screw-nut assembly can be accurately eliminated, it is guaranteed that gaps of a steering gear transmission pair in the middle and nearby positions are extremely small, and the stability of high-speed linear driving of an automobile is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, and more specifically, to a recirculating ball mechanical steering system employing an eccentric bevel gear rocker arm shaft. Background Technology

[0002] The kinematic pair of the recirculating ball mechanical steering system consists of a ball screw pair composed of a screw and a steering nut, and a gear and rack meshing pair composed of a rocker arm shaft and a steering nut. The transmission clearance of the transmission pair should be minimal, preferably zero, when the steering wheel is in the middle or near position.

[0003] Existing recirculating ball mechanical steering systems cannot quickly adjust the steering clearance, causing the steering wheels to be subjected to lateral forces, which will cause the wheels to deviate from their original driving position and make the car unstable.

[0004] Therefore, we have made improvements to this by proposing a recirculating ball mechanical steering system that uses an eccentric bevel gear rocker arm shaft. Summary of the Invention

[0005] The purpose of this invention is to address the fact that existing recirculating ball mechanical steering systems cannot quickly adjust the steering clearance, causing the steering wheels to be subjected to lateral forces, which will cause the wheels to deviate from their original driving position and make the car unstable.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A recirculating ball mechanical steering gear employing an eccentric bevel gear rocker arm shaft is proposed to improve the aforementioned problems.

[0008] The application is as follows:

[0009] It includes: a screw and nut assembly, a housing, a rocker arm shaft, a needle roller bearing, a steering vertical arm, a side cover, an adjusting screw, and a retainer. The rocker arm shaft is installed inside the screw and nut assembly. Two needle roller bearings are provided between the housing and the rocker arm shaft. The steering vertical arm is installed on the left side of the rocker arm shaft. The side cover is installed on the right side of the housing. The adjusting screw is located inside the side cover. The retainer is installed between the adjusting screw and the rocker arm shaft.

[0010] As a preferred embodiment of the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft provided by this utility model, the rocker arm shaft has a five-tooth bevel gear structure.

[0011] As a preferred embodiment of the recirculating ball mechanical steering gear with eccentric bevel gear rocker arm shaft provided by this utility model, the cutting angle of the bevel gear sector of the rocker arm shaft is 6.5°.

[0012] As a preferred embodiment of the recirculating ball mechanical steering gear with eccentric bevel gear rocker arm shaft provided by this utility model, the eccentricity of the rocker arm shaft is 0.1±0.02mm, and the eccentricity angle on both sides of the rocker arm shaft sector teeth is 3°~7°.

[0013] As a preferred embodiment of the recirculating ball mechanical steering gear with an eccentric bevel tooth rocker arm shaft provided by this utility model, the retainer axially fastens the rocker arm shaft through a press-fit connection mechanism.

[0014] As a preferred embodiment of the recirculating ball mechanical steering gear with eccentric bevel gear rocker arm shaft provided by this utility model, the rocker arm shaft is made of 20CrMnTi steel, with surface carburization, the carburized layer depth is 0.8 to 1.2 mm, and the surface hardness is 58 to 63 HRC.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] By adjusting the screw to move the rocker arm shaft, the gap generated by the meshing of the rocker arm shaft sector teeth and the screw nut assembly can be precisely eliminated, ensuring that the gap of the steering gear transmission pair is minimal in the middle and near the position, thus improving the stability of the car when driving straight at high speed. Attached Figure Description

[0017] Figure 1 A schematic diagram of the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft provided in this application;

[0018] Figure 2 A front cross-sectional view of the housing of the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft provided in this application;

[0019] Figure 3 An enlarged structural schematic diagram of A, the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft, provided in this application;

[0020] Figure 4 A schematic diagram of the rocker arm shaft of the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft provided in this application;

[0021] Figure 5 A schematic diagram of the eccentric gear sector of the recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft provided in this application.

[0022] The image shows:

[0023] 1. Screw and nut assembly; 2. Housing; 21. Rocker arm shaft; 22. Needle roller bearing; 23. Steering vertical arm; 24. Side cover; 3. Adjusting screw; 31. Retainer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0025] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] Please refer to Figure 1-5A recirculating ball mechanical steering gear employing an eccentric bevel gear rocker arm shaft includes: a screw and nut assembly 1, a housing 2, a rocker arm shaft 21, needle roller bearings 22, a steering vertical arm 23, a side cover 24, an adjusting screw 3, and a retainer 31. The rocker arm shaft 21 is installed inside the screw and nut assembly 1. Two needle roller bearings 22 are located between the housing 2 and the rocker arm shaft 21. The steering vertical arm 23 is installed on the left side of the rocker arm shaft 21. The side cover 24 is installed on the right side of the housing 2. The adjusting screw 3 is located inside the side cover 24. The retainer 31 is installed between the adjusting screw 3 and the rocker arm shaft 21. The rocker arm shaft 21 has a five-tooth bevel gear structure. The cutting angle of the tapered variable-thickness sector of the rocker arm shaft 21 is 6.5°. The eccentricity of the rocker arm shaft 21 is 0.1±0.02 mm, and the eccentricity angle on both sides of the sector gear of the rocker arm shaft 21 is 3°~7°. The retainer 31 axially secures the rocker arm shaft 21 via a press-fit connection mechanism. The rocker arm shaft 21 is made of 20CrMnTi steel with a carburized surface, a carburized layer depth of 0.8–1.2 mm, and a surface hardness of 58–63 HRC. When steering clearance needs adjustment, the adjusting screw 3 can be operated. Because the rocker arm shaft 21 has a five-tooth conical tooth structure, the adjusting screw 3 axially adjusts and pushes the rocker arm shaft 21 towards the direction of clearance, thereby eliminating the clearance generated by the meshing of the rocker arm shaft's tooth surface. The rocker arm shaft press-fit connection mechanism with retainer 31 effectively prevents axial movement of the rocker arm shaft 21. Because the rocker arm shaft 21 is made of 20CrMnTi steel with a carburized surface, a carburized layer depth of 0.8–1.2 mm, and a surface hardness of 58–63 HRC, it has good wear resistance during long-term use, reducing problems such as increased clearance and abnormal noise caused by wear, ensuring stable steering operation, and improving the vehicle's steering performance and driving safety.

[0033] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present utility model.

Claims

1. A recirculating ball mechanical steering system employing an eccentric bevel gear rocker arm shaft, characterized in that, include: The assembly comprises a screw and nut assembly (1), a housing (2), a rocker arm shaft (21), a needle roller bearing (22), a steering vertical arm (23), a side cover (24), an adjusting screw (3), and a retainer (31). The rocker arm shaft (21) is installed inside the screw and nut assembly (1). Two needle roller bearings (22) are located between the housing (2) and the rocker arm shaft (21). The steering vertical arm (23) is installed on the left side of the rocker arm shaft (21). The side cover (24) is installed on the right side of the housing (2). The adjusting screw (3) is located inside the side cover (24). The retainer (31) is installed between the adjusting screw (3) and the rocker arm shaft (21).

2. A recirculating ball mechanical steering system with an eccentric bevel gear rocker arm shaft according to claim 1, characterized in that, The rocker arm shaft (21) has five conical teeth on its sector teeth.

3. A recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft according to claim 2, characterized in that, The cutting angle of the tapered variable-thickness tooth sector of the rocker arm shaft (21) is 6.5°.

4. A recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft according to claim 3, characterized in that, The eccentricity of the rocker arm shaft (21) is 0.1±0.02mm, and the eccentricity angle on both sides of the sector teeth of the rocker arm shaft (21) is 3°~7°.

5. A recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft according to claim 4, characterized in that, The retainer (31) is axially fastened to the rocker arm shaft (21) by a riveting connection mechanism.

6. A recirculating ball mechanical steering gear with an eccentric bevel gear rocker arm shaft according to claim 5, characterized in that, The rocker arm shaft (21) is made of 20CrMnTi steel with surface carburization. The depth of the carburized layer is 0.8 to 1.2 mm, and the surface hardness is 58 to 63 HRC.

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