Lower steering shaft of automobile steering system
By designing the spline teeth and spline groove fitting, the matching of limit grooves and limit keys on the steering shaft, and the tightening of nuts and external threads, the problem of inconvenient connection between the lower steering shaft and the universal joint is solved, and stable transmission connection and convenient installation are achieved.
Patent Information
- Application Number
- CN202422874649.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In the prior art, the connection between the lower steering shaft and the universal joint is inconvenient, resulting in unstable connection and difficult to achieve transmission connection.
The upper end of the steering shaft body is inserted into the connecting hole of the universal joint, and the spline teeth are fitted with the spline grooves, combined with the design of the limit grooves and the limit keys, the stable connection between the steering shaft and the universal joint is achieved; at the same time, the connection reliability is enhanced by the tightening of the nuts and the external threads; the connection between the gear shaft and the steering shaft is designed through the spline teeth and the guide slope to achieve convenient transmission connection.
It realizes a convenient transmission connection between the steering shaft and the universal joint, improves the reliability and stability of the connection, avoids disengagement, and is more convenient to connect the gear shaft and the steering shaft.
Smart Images
Figure CN223253060U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile parts, in particular to a lower steering shaft of an automobile steering system. Background Art
[0002] The lower steering shaft is an important transmission component in the automobile steering system. When the lower steering shaft is in use, the upper end of the lower steering shaft is transmission-connected to the universal joint, and the lower end of the lower steering shaft is transmission-connected to the gear shaft in the automobile steering system. In the existing structure, the upper end of the lower steering shaft and the universal joint are connected together by welding, which has the disadvantage of being inconvenient to connect the lower steering shaft and the universal joint. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a lower steering shaft of an automobile steering system, which has the advantage of convenient transmission connection between the steering shaft body and the universal joint.
[0004] The utility model provides a lower steering shaft of an automobile steering system, comprising a steering shaft body, wherein the upper end of the steering shaft body is used for transmission connection with a universal joint, and the lower end of the steering shaft body is used for transmission connection with a gear shaft, a gear portion is coaxially arranged on the outer wall of the lower end of the steering shaft body, and the gear portion is used for meshing with an output gear installed on the output shaft of a power steering motor; a plurality of first spline teeth uniformly distributed in the circumferential direction are circumferentially arranged on the outer wall of the upper end of the steering shaft body, the upper end of the steering shaft body is used for inserting into a connecting hole located on the universal joint, and each first spline tooth is used for fitting with one of the first spline grooves on the inner wall of the connecting hole and limiting the position in the circumferential direction.
[0005] After adopting the above structure, the utility model has the advantage that the upper end of the steering shaft body is inserted into the connecting hole on the universal joint, and each first spline tooth is used to fit into and circumferentially limit one of the first spline grooves on the inner wall of the connecting hole, thereby enabling the steering shaft body to be conveniently connected to the universal joint through transmission. In other words, the utility model has the advantage of convenient connection between the steering shaft body and the universal joint through transmission.
[0006] In one possible embodiment, a limiting groove is provided on the outer wall of the upper end of the steering shaft body, the limiting groove extends along the radial direction of the steering shaft body and penetrates the steering shaft body, and a limiting key is laterally penetrated on the side wall of the connecting hole on the universal joint, and the limiting groove and the limiting key are partially engaged to achieve axial limitation of the steering shaft body and the universal joint; after adopting this structure, after the upper end of the steering shaft body is inserted into the connecting hole on the universal joint, and each first spline tooth is engaged with one of the first spline grooves on the inner wall of the connecting hole, the limiting key can be inserted into the side wall of the connecting hole on the universal joint, at this time, the limiting groove can be partially engaged with the limiting key, thereby achieving axial limitation of the steering shaft body and the universal joint to avoid the steering shaft body from being separated from the universal joint, that is, the reliability of the connection between the steering shaft body and the universal joint can be improved.
[0007] In one possible embodiment, an external thread is provided on the outer wall of the upper part of the steering shaft body, and the external thread is used to be threadedly connected to a nut sleeved on the outside of the steering shaft body, and the nut is used to be tightly abutted against the outer end of the connecting hole on the universal joint; by adopting this structure, when the nut is threadedly connected to the external thread and the nut is tightly abutted against the outer end of the connecting hole on the universal joint, the steering shaft body and the universal joint can be further tightened to avoid the steering shaft body from being separated from the universal joint.
[0008] In one possible embodiment, a socket is coaxially provided on the lower end of the steering shaft body, and the socket is used for inserting the upper end of the gear shaft; a plurality of second spline teeth are circumferentially provided on the inner wall of the socket, and each second spline tooth is used to engage with and circumferentially limit one of the second spline grooves at the upper end of the gear shaft; by adopting this structure, after the upper end of the gear shaft is inserted into the socket, each second spline tooth can engage with and circumferentially limit one of the second spline grooves at the upper end of the gear shaft, thereby enabling the lower end of the steering shaft body to be conveniently connected to the upper end of the gear shaft in terms of transmission.
[0009] In one possible embodiment, a guide bevel is provided on the lower end of each second spline tooth, and the guide bevel is used to cooperate with the inner wall of the second spline groove for guidance so that the upper end of the gear shaft can be inserted into the socket; by adopting this structure, during the process of inserting the upper end of the gear shaft into the socket located on the lower end of the steering shaft body, the guide bevel can cooperate with the inner wall of the second spline groove for guidance so that the upper end of the gear shaft can be inserted into the socket, which can facilitate the connection between the gear shaft and the steering shaft body. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;
[0011] Figure 2 It is a schematic cross-sectional structural diagram of the present utility model. DETAILED DESCRIPTION
[0012] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.
[0013] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.
[0014] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0015] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0016] See also Figure 1-2 As shown, the embodiment of the present application discloses a lower steering shaft of an automobile steering system, including a steering shaft body 1, the upper end of the steering shaft body 1 is used for transmission connection with the universal joint, and the lower end of the steering shaft body 1 is used for transmission connection with the gear shaft, and a gear portion 11 is coaxially arranged on the outer wall of the lower end of the steering shaft body 1, and the gear portion 11 is used to engage with the output gear installed on the output shaft of the power steering motor; a plurality of first spline teeth 12 are circumferentially arranged on the outer wall of the upper end of the steering shaft body 1 and are evenly distributed in the circumferential direction, and the upper end of the steering shaft body 1 is used to be inserted into the connecting hole located on the universal joint, and each first spline tooth 12 is used to fit with one of the first spline grooves on the inner wall of the connecting hole and be circumferentially limited.
[0017] A limiting groove 13 is provided on the outer wall of the upper end of the steering shaft body 1. The limiting groove 13 extends along the radial direction of the steering shaft body 1 and penetrates the steering shaft body 1. A limiting key is laterally penetrated on the side wall of the connecting hole on the universal joint. The limiting groove 13 is partially engaged with the limiting key to achieve axial limitation of the steering shaft body 1 and the universal joint. After adopting this structure, the upper end of the steering shaft body is inserted into the connecting hole on the universal joint, and each first spline tooth is engaged with one of the first spline grooves on the inner wall of the connecting hole. The limiting key can be inserted into the side wall of the connecting hole on the universal joint. At this time, the limiting groove can be partially engaged with the limiting key, thereby achieving axial limitation of the steering shaft body and the universal joint to avoid the steering shaft body from being separated from the universal joint, that is, the reliability of the connection between the steering shaft body and the universal joint can be improved.
[0018] An external thread 14 is provided on the outer wall of the upper part of the steering shaft body 1, and the external thread 14 is used to be threadedly connected to a nut sleeved on the outside of the steering shaft body 1, and the nut is used to be tightly abutted against the outer end of the connecting hole on the universal joint; by adopting this structure, when the nut is threadedly connected to the external thread and the nut is tightly abutted against the outer end of the connecting hole on the universal joint, the steering shaft body and the universal joint can be further tightened to prevent the steering shaft body from being separated from the universal joint.
[0019] A socket 15 is coaxially provided on the lower end of the steering shaft body 1, and the socket 15 is used for inserting the upper end of the gear shaft; a plurality of second spline teeth 16 are circumferentially provided on the inner wall of the socket 15, and each second spline tooth 16 is used to engage with one of the second spline grooves at the upper end of the gear shaft and be circumferentially limited; by adopting this structure, after the upper end of the gear shaft is inserted into the socket, each second spline tooth can engage with one of the second spline grooves at the upper end of the gear shaft and be circumferentially limited, so that the lower end of the steering shaft body can be conveniently connected to the upper end of the gear shaft in a transmission manner.
[0020] A guiding bevel 17 is provided on the lower end of each second spline tooth 16, and the guiding bevel 17 is used to cooperate with the inner wall of the second spline groove for guiding so that the upper end of the gear shaft can be inserted into the insertion hole 15; after adopting this structure, when the upper end of the gear shaft is inserted into the insertion hole located on the lower end of the steering shaft body, the guiding bevel can cooperate with the inner wall of the second spline groove for guiding so that the upper end of the gear shaft can be inserted into the insertion hole, which can facilitate the connection between the gear shaft and the steering shaft body.
[0021] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. A lower steering shaft of an automobile steering system, comprising a steering shaft body (1), wherein the upper end of the steering shaft body (1) is used for transmission connection with a universal joint, and the lower end of the steering shaft body (1) is used for transmission connection with a gear shaft, and a gear portion (11) is coaxially provided on the outer wall of the lower end of the steering shaft body (1), and the gear portion (11) is used for meshing with an output gear installed on the output shaft of a power steering motor; characterized in that: A plurality of first spline teeth (12) uniformly distributed in the circumferential direction are circumferentially arranged on the outer wall of the upper end of the steering shaft body (1); the upper end of the steering shaft body (1) is used to be inserted into a connecting hole on a universal joint; each of the first spline teeth (12) is used to be engaged with one of the first spline grooves on the inner wall of the connecting hole and to be circumferentially limited.
2. The lower steering shaft of the automobile steering system according to claim 1, characterized in that: A limiting groove (13) is provided on the outer wall of the upper end of the steering shaft body (1), and the limiting groove (13) extends along the radial direction of the steering shaft body (1) and penetrates the steering shaft body (1). A limiting key is transversely penetrated on the side wall of the connecting hole on the universal joint, and the limiting groove (13) is partially engaged with the limiting key to achieve axial limitation of the steering shaft body (1) and the universal joint.
3. The lower steering shaft of the automobile steering system according to claim 1 or 2, characterized in that: An external thread (14) is provided on the outer wall of the upper portion of the steering shaft body (1), and the external thread (14) is used for threaded connection with a nut sleeved on the outside of the steering shaft body (1), and the nut is used for tightening against the outer end of the connection hole on the universal joint.
4. The lower steering shaft of the automobile steering system according to claim 1, characterized in that: A socket (15) is coaxially provided on the lower end of the steering shaft body (1), and the socket (15) is used for inserting the upper end of the gear shaft; a plurality of second spline teeth (16) are circumferentially provided on the inner wall of the socket (15), and each of the second spline teeth (16) is used to engage with one of the second spline grooves at the upper end of the gear shaft and limit the position circumferentially.
5. The lower steering shaft of the automobile steering system according to claim 4, characterized in that: A guide slope (17) is provided on the lower end of each second spline tooth (16), and the guide slope (17) is used to cooperate with the inner wall of the second spline groove to guide the upper end of the gear shaft to be inserted into the insertion hole (15).