An electric steering gear input shaft and screw assembly

Abstract

This invention discloses an electric steering gear input shaft and screw assembly, including a steering screw, an input shaft, and an elastic torsion bar. One end of the steering screw has a stepped hole; the stepped hole includes a connecting hole and a limiting hole arranged sequentially from the outside to the inside; the elastic torsion bar passes through the inside of the input shaft; one end of the elastic torsion bar is inserted into the connecting hole and connected to the steering screw via a first limiting pin; the other end of the elastic torsion bar is connected to the input shaft via a second limiting pin; a limiting sleeve is detachably connected within the limiting hole; the limiting sleeve has a limiting groove; a limiting boss is provided on the outer wall of the input shaft at a position corresponding to the limiting groove. This invention allows for the replacement of limiting sleeves with limiting grooves of different sizes as needed, thereby changing the rotation space and thus the relative rotation angle between the input shaft and the steering screw, improving the practicality of the device. Furthermore, if the relative rotation angle changes due to wear of the limiting groove wall during long-term use, only the limiting sleeve needs to be replaced, saving costs.

Description

Technical Field

[0001] This invention relates to the field of steering technology, and more specifically to an electric steering input shaft and screw assembly. Background Technology

[0002] From the perspective of the automotive industry, with the continuous increase in the number of fuel-powered vehicles, vehicle emissions are causing increasingly serious environmental pollution. Meanwhile, petroleum, as a non-renewable energy source, is facing the crisis of depletion. Therefore, electric and hybrid vehicles, with their advantages of energy saving and environmental protection, have become a focus of government and society, and a core development theme in wheeled vehicle technology. Electric power steering technology, due to its high integration, energy saving, and maintenance-free operation, has been widely used in domestic and international passenger car markets. The electric steering gear is one of the key components controlling vehicle steering, and the input shaft and screw assembly is a crucial part of the electric steering gear. Existing electric steering gears typically have a limiting groove inside the steering screw and a limiting boss on the input shaft. The limiting groove and boss work together to restrict the relative rotation between the input shaft and the steering screw, preventing over-torsion of the elastic torsion bar during assembly or use. However, the rotation space within the limiting groove of the steering screw is fixed, resulting in a fixed relative rotation angle between the input shaft and the steering screw. This makes it impossible to change the relative rotation angle as needed, leading to poor overall practicality. Summary of the Invention

[0003] In view of this, the present invention provides an electric steering input shaft and screw assembly, the purpose of which is to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An electric steering input shaft and screw assembly includes: a steering screw, an input shaft, and an elastic torsion bar; one end of the steering screw has a stepped hole; the stepped hole includes a connecting hole and a limiting hole arranged sequentially from the outside to the inside; the elastic torsion bar passes through the inside of the input shaft; one end of the elastic torsion bar is inserted into the connecting hole and connected to the steering screw through a first limiting pin; the other end of the elastic torsion bar is connected to the input shaft through a second limiting pin; a limiting sleeve is detachably connected in the limiting hole; the limiting sleeve has a limiting groove; a limiting boss is provided on the outer wall of the input shaft at a position corresponding to the limiting groove.

[0006] Preferably, the end of the limiting sleeve near the input shaft is connected to the end face of the steering screw near the input shaft by a connecting bolt.

[0007] Preferably, the end face of the limiting sleeve away from the input shaft is provided with a protrusion; the inner bottom wall of the limiting hole is provided with a groove that matches the protrusion.

[0008] Preferably, the input shaft has a through hole along the axial direction; the elastic torsion bar is inserted into the through hole.

[0009] Preferably, splines are provided on the outer walls of both ends of the elastic torsion bar; keyways adapted to the splines are provided in both the connecting hole and the through hole.

[0010] Preferably, it further includes a steering nut; the steering nut is disposed at the end of the steering screw away from the input shaft.

[0011] Preferably, the stepped hole further includes an intermediate hole; the intermediate hole is disposed between the connecting hole and the limiting hole; one end of the input shaft near the steering screw is inserted into the intermediate hole; a bearing is provided between the outer wall of the input shaft and the inner wall of the intermediate hole.

[0012] Compared with the prior art, the present invention achieves the following technical effects: By setting a detachable limiting sleeve in the limiting hole of the steering screw, the present invention can not only replace the limiting sleeve with a limiting groove of different size as needed, thereby changing the size of the rotation space and thus changing the relative rotation angle between the input shaft and the steering screw, improving the practicality of the device, but also, when the wall of the limiting groove wears down during long-term use and the relative rotation angle changes, only the limiting sleeve needs to be replaced, without replacing the entire steering screw, thus saving costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an electric steering gear input shaft and screw assembly according to the present invention;

[0014] Figure 2 for Figure 1 Sectional view of section line AA in the middle;

[0015] Figure 3 for Figure 1 A magnified view of part B in the middle section;

[0016] Figure 4 This is a schematic diagram of the steering screw structure;

[0017] Figure 5 This is a schematic diagram of the structure of an elastic torsion bar;

[0018] Figure 6 This is a plan view of the limiting sleeve;

[0019] Figure 7 A three-dimensional view of the limiting sleeve;

[0020] In the diagram: 1. Steering screw; 2. Input shaft; 3. Elastic torsion bar; 4. Steering nut; 5. Stepped hole; 501. Connecting hole; 502. Limiting hole; 503. Intermediate hole; 6. First limiting pin; 7. Second limiting pin; 8. Limiting sleeve; 801. Outer ring sleeve; 802. Inner ring sleeve; 9. Limiting groove; 10. Limiting boss; 11. Bearing; 12. Protrusion; 13. Spline; 14. Through hole; 15. Keyway. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example

[0023] Reference Figure 1-7 As shown, this invention discloses an electric steering gear input shaft and screw assembly, including: a steering screw 1, an input shaft 2, an elastic torsion bar 3, and a steering nut 4; one end of the steering screw 1 has a stepped hole 5 along its axial direction; the stepped hole 5 includes a connecting hole 501 and a limiting hole 502 arranged sequentially from the outside to the inside; the elastic torsion bar 3 passes through the inside of the input shaft 2; one end of the elastic torsion bar 3 is inserted into the connecting hole 501 and connected to the steering screw 1 through a first limiting pin 6, which serves as a positioning connection to prevent one end of the elastic torsion bar 3 from rotating relative to the steering screw 1; the other end of the elastic torsion bar 3 is connected to the input shaft 2 through a second limiting pin 7, which also serves as a positioning connection to prevent the other end of the elastic torsion bar 3 from rotating relative to the input shaft 2; a limiting sleeve 8 is detachably connected in the limiting hole 502 for easy replacement. Different limiting sleeves are provided; the limiting sleeve 8 is provided with a limiting groove 9; a limiting boss 10 is provided on the outer wall of the input shaft 2 at a position corresponding to the limiting groove 9; the limiting boss 10 cooperates with the limiting groove 9 to limit the rotation of the input shaft 2 and the steering screw 1, so that the input shaft 2 and the steering screw 1 can rotate relative to each other within a certain angle range; the steering nut 4 is set at the end of the steering screw 1 away from the input shaft 2; by setting a detachable limiting sleeve in the limiting hole of the steering screw, not only can the limiting sleeve with a limiting groove of different size be replaced as needed, thereby changing the size of the rotation space and thus changing the relative rotation angle of the input shaft and the steering screw, improving the practicality of the device, but also, after the wall of the limiting groove wears down during long-term use and the relative rotation angle changes, only the limiting sleeve needs to be replaced, without replacing the entire steering screw, saving costs.

[0024] In this embodiment, the end of the limiting sleeve 8 near the input shaft 2 is connected to the end face of the steering screw 1 near the input shaft 2 by a connecting bolt, which facilitates the installation and removal of the limiting sleeve.

[0025] In this embodiment, a protrusion 12 is provided on the end face of the limiting sleeve 8 away from the input shaft 2; a groove adapted to the protrusion 12 is provided on the inner bottom wall of the limiting hole 502; the protrusion 12 is inserted into the groove to improve the stability of the limiting sleeve.

[0026] In this embodiment, the limiting sleeve 8 includes an outer ring sleeve 801 and an inner ring sleeve 802 disposed on the inner side wall of the outer ring sleeve; the end face of the outer ring sleeve 801 near the steering screw 1 is attached to the steering screw 1; the protrusion 12 is disposed on the end face of the inner ring sleeve 802 near the first limiting pin 6; two limiting grooves 9 are provided on the inner ring sleeve 802 symmetrically along the axis; correspondingly, two limiting protrusions 10 are provided symmetrically along the axis on the outer side wall of the input shaft 2.

[0027] In this embodiment, the input shaft 2 has a through hole 14 along the axial direction; the elastic torsion bar 3 is inserted into the through hole 14.

[0028] In this embodiment, splines 13 are provided on the outer walls of both ends of the elastic torsion bar 3; keyways 15 adapted to the splines 13 are provided in both the connecting hole 501 and the through hole 14; by the cooperation of splines and keyways, the stability of the connection between the elastic torsion bar and the steering screw and the connection between the elastic torsion bar and the input shaft can be further improved, thereby further reducing the risk of relative rotation.

[0029] In this embodiment, the stepped hole 5 also includes an intermediate hole 503; the intermediate hole 503 is disposed between the connecting hole 501 and the limiting hole 502; one end of the input shaft 2 near the steering screw 1 is inserted into the intermediate hole 503; a bearing 11 is provided between the outer wall of the input shaft 2 and the inner wall of the intermediate hole 503.

[0030] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An electric steering input shaft and screw assembly, characterized in that, include: The steering screw (1), input shaft (2), and elastic torsion bar (3) are provided. One end of the steering screw (1) is provided with a stepped hole (5). The stepped hole (5) includes a connecting hole (501) and a limiting hole (502) arranged sequentially from the outside to the inside. The elastic torsion bar (3) passes through the inside of the input shaft (2). One end of the elastic torsion bar (3) is inserted into the connecting hole (501) and connected to the steering screw (1) through a first limiting pin (6). The other end of the elastic torsion bar (3) is connected to the input shaft (2) through a second limiting pin (7). A limiting sleeve (8) is detachably connected in the limiting hole (502). A limiting groove (9) is provided on the limiting sleeve (8). A limiting boss (10) is provided on the outer wall of the input shaft (2) at a position corresponding to the limiting groove (9). The end of the limiting sleeve (8) near the input shaft (2) is connected to the end face of the steering screw (1) near the input shaft (2) by a connecting bolt; The limiting sleeve (8) has a protrusion (12) on one end face away from the input shaft (2); the inner bottom wall of the limiting hole (502) has a groove that matches the protrusion (12); The limiting sleeve (8) includes an outer ring sleeve (801) and an inner ring sleeve (802) disposed on the inner side wall of the outer ring sleeve (801); the end face of the outer ring sleeve (801) near the steering screw (1) is attached to the steering screw (1); the protrusion (12) is disposed on the end face of the inner ring sleeve (802) near the first limiting pin (6); two limiting grooves (9) symmetrically arranged along the axis are provided on the inner ring sleeve (802); two limiting bosses (10) symmetrically arranged along the axis are provided on the outer side wall of the input shaft (2). The stepped hole (5) also includes an intermediate hole (503); the intermediate hole (503) is located between the connecting hole (501) and the limiting hole (502); one end of the input shaft (2) near the steering screw (1) is inserted into the intermediate hole (503); a bearing (11) is provided between the outer wall of the input shaft (2) and the inner wall of the intermediate hole (503).

2. The electric steering input shaft and screw assembly according to claim 1, characterized in that, The input shaft (2) has a through hole (14) along the axial direction inside; the elastic torsion bar (3) is inserted into the through hole (14).

3. The electric steering input shaft and screw assembly according to claim 2, characterized in that, The elastic torsion bar (3) has splines (13) on both outer walls at both ends; the connecting hole (501) and the through hole (14) are provided with keyways (15) that are adapted to the splines (13) in place.

4. The electric steering input shaft and screw assembly according to claim 1, characterized in that, It also includes a steering nut (4); the steering nut (4) is located at the end of the steering screw (1) away from the input shaft (2).

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