Automobile steering system worm

Abstract

The utility model provides a kind of automobile steering system worm, including worm main body, the middle part of worm main body forms worm part, the both ends of worm main body form support part, the outer end of one support part is coaxially provided with the connecting part of the outer diameter less than support part, two support parts are used to be rotatably connected with steering gear housing, connecting part is used to be transmission connection with the output shaft of steering assist motor, worm part is used to be engaged and transmission connection with assist output gear;Automobile steering system worm further includes two bearings, the inner ring of two bearings is respectively sleeved on one of support part and is tightly matched with support part, the outer ring of two bearings is embedded in the embedded groove on steering gear housing;The utility model can improve the smoothness of worm main body and steering gear housing rotation, and also can effectively avoid the abrasion of support part and steering gear housing, i.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive steering system components, and more specifically, to an automotive steering system worm gear. Background Technology

[0002] The worm gear in an automotive steering system is a crucial transmission component. Its function is to connect with the power steering motor and transmit driving force to the power steering output gear. The power steering output gear then drives the steering column to assist the driver in steering the vehicle. Existing automotive steering system worm gears consist of a worm body, a worm section in the middle, and support sections at both ends. One of the support sections has a coaxial connecting section with an outer diameter smaller than the support section. Both support sections are rotatably connected to the steering gear housing, the connecting section is connected to the output shaft of the power steering motor, and the worm section meshes with the power steering output gear. In this existing structure, because the two support sections of the worm body are directly rotatably connected to the steering gear housing, there is a drawback: high rotational friction between the support sections and the steering gear housing. This not only easily causes wear on the support sections and the steering gear housing but also results in poor smoothness of rotation between the worm body and the steering gear housing. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a worm gear for an automotive steering system, which can improve the smoothness of rotation between the worm gear body and the steering gear housing, and can also effectively avoid wear on the support and the steering gear housing, thus ensuring the service life of the worm gear body and the steering gear housing.

[0004] This utility model provides a worm gear for an automotive steering system, including a worm body, a worm section formed in the middle of the worm body, and support sections formed at both ends of the worm body. A connecting section with an outer diameter smaller than the support section is coaxially provided on the outer end of one of the support sections. Both support sections are used for rotatable connection with the steering gear housing, the connecting section is used for transmission connection with the output shaft of the power steering motor, and the worm section is used for meshing and transmission connection with the power steering output gear. The automotive steering system worm gear also includes two bearings, the inner rings of which are respectively sleeved on one of the support sections and tightly fitted with the support section, and the outer rings of both bearings are embedded in grooves on the steering gear housing.

[0005] This invention improves the smoothness of rotation of the worm gear body and the steering gear housing by attaching bearings to both support parts of the worm gear body. It also effectively prevents wear on the support parts and the steering gear housing, thus ensuring the service life of the worm gear body and the steering gear housing.

[0006] In one possible implementation, several anti-slip grooves are provided circumferentially at intervals on the outer wall of each support, and each anti-slip groove extends along the axial direction of the support. By providing several anti-slip grooves distributed circumferentially at intervals on the outer wall of each support, after the inner ring of the bearing is fitted onto the outside of the support and tightly fitted with the support, the friction between the support and the inner ring of the bearing can be further increased under the action of the anti-slip grooves, that is, the bearing can be reliably assembled with the support.

[0007] In one possible implementation, each support portion and worm gear portion is provided with an annular protrusion at the connection point, and each annular protrusion is used to abut against the inner end of the inner ring of the bearing on the corresponding side; with this structure, when the inner ring of the bearing is sleeved and fixed on the support portion, the inner end of the inner ring of the bearing can abut against the annular protrusion on the corresponding side, thereby achieving the limitation of the bearing and the support portion.

[0008] In one possible implementation, the connecting part is connected to the output shaft of the power steering motor via a coupling. The outer wall of the connecting part is provided with several splines in the circumferential direction, and each spline is used to engage with one of the spline slots located on the inner wall of one end of the coupling. By adopting this structure, the connecting part can be reliably connected to the output shaft of the power steering motor, which has the advantage of high reliability in the transmission connection between the worm gear body and the power steering motor.

[0009] In one possible implementation, each spline tooth has a chamfered surface on its outer end. The chamfered surface is used to guide and engage with the inner wall of one end of the coupling to facilitate the insertion of the spline tooth into the spline groove. By providing a chamfered surface on the outer end of each spline tooth, when the spline tooth is inserted into the spline groove, the chamfered surface can engage and guide with the inner wall of one end of the coupling to facilitate the insertion of the spline tooth into the spline groove, thus facilitating the insertion connection between the connecting part and one end of the coupling. Attached Figure Description

[0010] Figure 1 This is the first three-dimensional structural schematic diagram of the present invention; Figure 2 This is a second three-dimensional structural diagram of the present invention. Detailed Implementation

[0011] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0012] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0013] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0014] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] See Figures 1-2 As shown in the figure, this application discloses a worm gear for an automotive steering system, including a worm body 1, a worm portion 11 formed in the middle of the worm body 1, and support portions 12 formed at both ends of the worm body 1. A connecting portion 13 with an outer diameter smaller than the support portion 12 is coaxially provided on the outer end of one of the support portions 12. Both support portions 12 are used for rotatable connection with the steering gear housing, and the connecting portion 13 is used for transmission connection with the output shaft of the power steering motor. The worm portion 11 is used for meshing and transmission connection with the power steering output gear. The automotive steering system worm gear also includes two bearings. The inner rings of the two bearings are respectively sleeved on one of the support portions 12 and tightly fitted with the support portion 12. The outer rings of the two bearings are both embedded in grooves on the steering gear housing.

[0016] Each support 12 has several anti-slip grooves 121 arranged circumferentially on its outer wall. Each anti-slip groove 121 extends along the axial direction of the support 12. By providing several anti-slip grooves arranged circumferentially on the outer wall of each support, after the inner ring of the bearing is fitted onto the outside of the support and tightly fitted with the support, the friction between the support and the inner ring of the bearing can be further increased under the action of the anti-slip grooves, so that the bearing can be reliably assembled with the support.

[0017] Each support portion 12 is provided with an annular protrusion 14 at the connection between it and the worm gear portion 11. Each annular protrusion 14 is used to abut against the inner end of the inner ring of the bearing on the corresponding side. With this structure, when the inner ring of the bearing is fitted and fixed onto the support portion, the inner end of the inner ring of the bearing can abut against the annular protrusion on the corresponding side, thereby achieving the limitation of the bearing and the support portion.

[0018] The connecting part 13 is connected to the output shaft of the power steering motor via a coupling. The outer wall of the connecting part 13 is provided with several spline teeth 131 in the circumferential direction. Each spline tooth 131 is used to engage with one of the spline grooves located on the inner wall of one end of the coupling. By adopting this structure, the connecting part can be reliably connected to the output shaft of the power steering motor, which has the advantage of high reliability in the transmission connection between the worm gear body and the power steering motor.

[0019] Each spline tooth 131 has a chamfered surface 132 on its outer end. The chamfered surface 132 is used to guide the spline tooth 131 to be inserted into the spline groove by engaging with the inner wall of the coupling. By providing a chamfered surface on the outer end of each spline tooth, when the spline tooth is engaged with the spline groove, the chamfered surface can engage with the inner wall of the coupling to guide the spline tooth to be inserted into the spline groove, which facilitates the insertion connection between the connecting part and one end of the coupling.

[0020] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A worm gear for an automotive steering system, comprising a worm body (1), a worm portion (11) formed in the middle of the worm body (1), and support portions (12) formed at both ends of the worm body (1). A connecting portion (13) with an outer diameter smaller than that of the support portion (12) is coaxially disposed on the outer end of one of the support portions (12). Both support portions (12) are rotatably connected to a steering gear housing. The connecting portion (13) is used for transmission connection with the output shaft of a power steering motor. The worm portion (11) is used for meshing and transmission connection with a power steering output gear. The worm gear is characterized in that: The worm gear of the automotive steering system also includes two bearings. The inner rings of the two bearings are respectively sleeved on one of the support parts (12) and tightly fitted to the support part (12). The outer rings of the two bearings are both embedded in the grooves on the steering gear housing.

2. The worm gear of the automotive steering system according to claim 1, characterized in that: Each of the support portions (12) has a number of anti-slip grooves (121) spaced out circumferentially on its outer wall, and each anti-slip groove (121) extends along the axial direction of the support portion (12).

3. The worm gear of the automotive steering system according to claim 1 or 2, characterized in that: Each of the support portions (12) and the worm portion (11) is provided with an annular protrusion (14), and each of the annular protrusions (14) is used to abut against the inner end of the inner ring of the bearing on the corresponding side.

4. The worm gear of the automotive steering system according to claim 3, characterized in that: The connecting part (13) is connected to the output shaft of the power steering motor via a coupling. The outer wall of the connecting part (13) is provided with several splines (131) in the circumferential direction. Each spline (131) is used to engage with one of the spline slots located on the inner wall of one end of the coupling.

5. The worm gear of the automotive steering system according to claim 4, characterized in that: Each of the spline teeth (131) has a chamfered surface (132) on its outer end. The chamfered surface (132) is used to cooperate with the inner wall of one end of the coupling for guidance so that the spline teeth (131) can be inserted into the spline groove.

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