Novel automobile steer-by-wire system limiting device

Abstract

The utility model discloses a novel automobile steer-by-wire system limiting device which comprises a multi-stage rotation limiting mechanism arranged on a rotating shaft, and the multi-stage rotation limiting mechanism comprises a first limiting ring, a second limiting ring, a third limiting ring and a fourth limiting ring which are sequentially arranged on the rotating shaft in a sleeving mode. The first limiting ring is arranged on a transmission meshing part arranged at the tail end of the rotating shaft in a sleeving mode and can coaxially rotate along with the rotating shaft, and the second limiting ring, the third limiting ring and the fourth limiting ring are all rotationally connected with the rotating shaft. A first limiting bulge, a second limiting bulge, a third limiting bulge and a fourth limiting bulge are respectively arranged on the circumferential side walls of the first limiting ring, the second limiting ring, the third limiting ring and the fourth limiting ring; a blocking piece is further arranged on the periphery of the rotating shaft, and a blocking protrusion capable of being attached to the fourth limiting protrusion is arranged on the blocking piece. The device has the advantages of simple structure, convenience in installation, small occupied space, stability and reliability in operation, small friction damage and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile wire-controlled steering systems, in particular to a novel automobile wire-controlled steering system limiting device. Background Art

[0002] With the development of automotive electronic technology, wire-controlled steering has become a development trend. Compared with the traditional steering system, wire-controlled steering cancels the physical connection between the steering wheel and the wheel. The traditional method of relying on the limit of the mechanical parts of the steering gear to ensure the travel is not suitable for wire-controlled steering products. However, the customer's requirements for the turning angle of the car steering wheel have not changed, so it is necessary to design a limit mechanism to ensure the turning angle of the car steering wheel. Patent publication number CN114932942A discloses a limit device, a wire-controlled steering system and a vehicle, including three annular limit members arranged on the periphery of the rotating shaft, and the rotating shaft and the three annular limit members are all provided with limit parts, and the limit parts can be sequentially fitted with each other in the circumferential direction, so as to achieve the function of rotationally limiting the rotating shaft, but there are problems such as complex structure, inconvenient installation, and large space occupation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a novel automobile wire-controlled steering system limit device. The steering system limit device has stable and reliable operation, simple and compact structure, easy installation, small space occupation, and small friction damage, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel limit device for a wire-controlled steering system of an automobile, comprising a multi-stage rotation limit mechanism provided on a rotating shaft, wherein the multi-stage rotation limit mechanism comprises a first limit ring, a second limit ring, a third limit ring and a fourth limit ring which are sequentially sleeved on the rotating shaft, and the first limit ring is sleeved on a transmission meshing portion provided at the end of the rotating shaft, the circumferential inner wall structure of the first limit ring is adapted to the transmission meshing portion and can rotate coaxially with the rotating shaft, the second limit ring, the third limit ring and the fourth limit ring are all rotationally connected to the rotating shaft, and the first limit ring is sleeved on a transmission meshing portion provided at the end of the rotating shaft, the circumferential inner wall structure of the first limit ring is adapted to the transmission meshing portion and can rotate coaxially with the rotating shaft, the second limit ring, the third limit ring and the fourth limit ring are all rotationally connected to the rotating shaft, and the A limiting ring, a second limiting ring, a third limiting ring and a fourth limiting ring are sequentially fitted with each other; a first limiting protrusion, a second limiting protrusion, a third limiting protrusion and a fourth limiting protrusion are respectively provided on the circumferential side walls of the first limiting ring, the second limiting ring, the third limiting ring and the fourth limiting ring, and the first limiting protrusion, the second limiting protrusion, the third limiting protrusion and the fourth limiting protrusion can sequentially fit with each other in the circumferential direction; a blocking member is also provided on the periphery of the rotating shaft, and the blocking member is a ring-shaped structure, and a blocking protrusion is provided on the blocking member that can fit with the fourth limiting protrusion in the circumferential direction.

[0005] Furthermore, the end of the rotating shaft is a stepped shaft structure with a reduced diameter, the tail of the convex shaft at the end of the rotating shaft is a non-circular cylindrical structure, and the tail of the convex shaft at the end of the rotating shaft is a transmission engaging part, the fourth limiting ring is fitted with the step of the rotating shaft, and the first limiting ring is fixedly nested on the transmission engaging part.

[0006] To achieve the above-mentioned purpose, the utility model also provides the following technical solutions: a novel limit device for a wire-controlled steering system of an automobile, comprising a multi-stage rotation limit mechanism provided on a rotating shaft, wherein the multi-stage rotation limit mechanism comprises a first limit ring, a second limit ring, a third limit ring and a fourth limit ring which are sequentially sleeved on the rotating shaft, and the first limit ring is sleeved on a transmission meshing portion provided at the end of the rotating shaft, the circumferential inner wall structure of the first limit ring is adapted to the transmission meshing portion and can rotate coaxially with the rotating shaft, the second limit ring, the third limit ring and the fourth limit ring are all rotationally connected to the rotating shaft, and the first limit ring is sleeved on a transmission meshing portion provided at the end of the rotating shaft, the circumferential inner wall structure of the first limit ring is adapted to the transmission meshing portion and can rotate coaxially with the rotating shaft, the second limit ring, the third limit ring and the fourth limit ring are all rotationally connected to the rotating shaft, and the A limiting ring, a second limiting ring, a third limiting ring and a fourth limiting ring are sequentially fitted with each other; a first limiting protrusion, a second limiting protrusion, a third limiting protrusion and a fourth limiting protrusion are respectively provided on the circumferential side walls of the first limiting ring, the second limiting ring, the third limiting ring and the fourth limiting ring, and the first limiting protrusion, the second limiting protrusion, the third limiting protrusion and the fourth limiting protrusion can sequentially fit with each other in the circumferential direction; a blocking member is also provided on the periphery of the rotating shaft, and the blocking member is a ring-shaped structure, and a blocking protrusion is provided on the blocking member that can fit with the fourth limiting protrusion in the circumferential direction.

[0007] Furthermore, an engaging protrusion is provided on the circumferential outer wall at the end of the rotating shaft, and the engaging protrusion of the rotating shaft is a transmission engaging portion. An axial limiting portion is also provided on the rotating shaft on the outside of the transmission engaging portion, and the end face of the first limiting ring is in contact with the axial limiting portion to prevent it from falling off from the end of the rotating shaft; an annular groove is provided on the rotating shaft at the front end of the fourth limiting ring, and a retaining spring is provided in the annular groove, and an elastic member is provided on the rotating shaft between the retaining spring and the fourth limiting ring.

[0008] Furthermore, the axial limiting portion is a shoulder structure provided at the end of the rotating shaft.

[0009] Furthermore, a copper sleeve is fixed on the outer wall of the rotating shaft at positions corresponding to the second limiting ring, the third limiting ring and the fourth limiting ring. The second limiting ring, the third limiting ring and the fourth limiting ring are all rotatably connected to the rotating shaft through the copper sleeve, and the outer diameter of the copper sleeve is smaller than the inner diameter of the first limiting ring.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the new automobile wire-controlled steering system limit device drives the first limit ring to rotate together through the rotating shaft, and the first limit protrusion, the second limit protrusion, the third limit protrusion, the fourth limit protrusion and the blocking protrusion can fit each other in sequence in the circumferential direction, thereby realizing the limiting of the rotation of the rotating shaft; the first limit ring, the second limit ring, the third limit ring and the fourth limit ring fit each other in sequence, the steering system limit device operates stably and reliably, has a simple and compact structure, is easy to install, occupies a small space, and has little friction damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0012] Figure 2 This is a schematic diagram of the shaft structure of the first embodiment of the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the multi-stage rotation limiting mechanism of the utility model;

[0014] Figure 4 This is a schematic diagram of the structure of the blocking member of the utility model;

[0015] Figure 5 This is a schematic structural diagram of the second embodiment of the utility model;

[0016] Figure 6 This is a schematic diagram of the shaft structure of the second embodiment of the utility model;

[0017] Figure 7 This is an exploded schematic diagram of the rotating shaft and the multi-stage rotation limiting mechanism of the second embodiment of the utility model;

[0018] Figure 8 This is a cross-sectional view of a limiting device according to the second embodiment of the utility model.

[0019] In the figure: 1. rotating shaft; 11. transmission engaging part; 111. engaging protrusion; 12. axial limiting part; 13. annular groove; 2. multi-stage rotation limiting mechanism; 21. first limiting ring; 211. first limiting protrusion; 22. second limiting ring; 221. second limiting protrusion; 23. third limiting ring; 231. third limiting protrusion; 24. fourth limiting ring; 241. fourth limiting protrusion; 3. blocking member; 31. blocking protrusion; 4. retaining spring; 5. elastic member; 6. copper sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1

[0021] See also Figure 1-4 The utility model provides a technical solution: a novel limit device for a wire-controlled steering system of an automobile, comprising a multi-stage rotation limit mechanism 2 provided on a rotating shaft 1, wherein the multi-stage rotation limit mechanism 2 comprises a first limit ring 21, a second limit ring 22, a third limit ring 23 and a fourth limit ring 24 which are sequentially sleeved on the rotating shaft 1; the end of the rotating shaft 1 is a stepped shaft structure with a reduced diameter, the tail of the convex shaft at the end of the rotating shaft 1 is a non-circular cylindrical structure, and the tail of the convex shaft at the end of the rotating shaft 1 is a transmission meshing portion 11, and the first limit ring 21 is fixedly nested on the transmission meshing portion 11; the second limit ring 22, the third limit ring 23 and the fourth limit ring 24 are all rotatably connected to the rotating shaft 1, and the fourth limit ring 24 is in contact with the step of the rotating shaft 1. The first limiting ring 21, the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are fitted together in sequence; the first limiting ring 21, the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are respectively provided with a first limiting protrusion 211, a second limiting protrusion 221, a third limiting protrusion 231 and a fourth limiting protrusion 241 on the circumferential side walls, and the first limiting protrusion 211, the second limiting protrusion 221, the third limiting protrusion 231 and the fourth limiting protrusion 241 can fit together in sequence in the circumferential direction; the periphery of the rotating shaft 1 is also provided with a blocking member 3, the blocking member 3 is a ring-shaped structure, and the blocking member 3 is provided with a blocking protrusion 31 which can fit with the fourth limiting protrusion 241 in the circumferential direction.

[0022] Working principle:

[0023] The blocking member 3 is fixed on the worm gear housing of the steering gear; the first limiting ring 21 rotates with the rotating shaft 1, and when the first limiting protrusion 211 on the first limiting ring 21 fits with the second limiting protrusion 221 on the second limiting ring 22, the first limiting ring 21 pushes the second limiting ring 22 to rotate with the rotating shaft 1; when the second limiting protrusion 221 on the second limiting ring 22 fits with the third limiting protrusion 231 on the third limiting ring 23, the third limiting ring 23 rotates with the rotating shaft 1. The rotating shaft 1 rotates together; when the third limiting protrusion 231 on the third limiting ring 23 is fitted with the fourth limiting protrusion 241 on the fourth limiting ring 24, the fourth limiting ring 24 rotates together with the rotating shaft 1, and when the fourth limiting protrusion 241 on the fourth limiting ring 24 is fitted with the blocking protrusion 31 on the blocking member 3, the continued rotation of the rotating shaft 1 is limited; therefore, the rotation stroke of the rotating shaft 1 and the steering wheel can be limited to three and a half circles, which is more in line with driving habits and has more precise pointing.

[0024] The limiting device of the automobile wire-controlled steering system disclosed in the present embodiment drives the first limiting ring 21 to rotate together through the rotating shaft 1, and the first limiting protrusion 211, the second limiting protrusion 221, the third limiting protrusion 231, the fourth limiting protrusion 241 and the blocking protrusion 31 can fit together in the circumferential direction in sequence, thereby limiting the rotation of the rotating shaft 1; the limiting device disclosed in the present embodiment, the first limiting ring 21, the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 fit together in sequence, the first limiting ring 21 is fixedly nested on the transmission meshing part 11, and the fourth limiting ring 24 fits with the step of the rotating shaft 1, the steering system limiting device operates more stably and reliably, has a simple structure, is easy to install, has a compact structure, and occupies a small space. Embodiment 2

[0025] See also Figure 3-8 The utility model also provides a technical solution: a novel limit device for a wire-controlled steering system of an automobile, comprising a multi-stage rotation limit mechanism 2 provided on a rotating shaft 1, wherein the multi-stage rotation limit mechanism 2 comprises a first limit ring 21, a second limit ring 22, a third limit ring 23 and a fourth limit ring 24 which are sequentially sleeved on the rotating shaft 1;

[0026] An engaging protrusion 111 is provided on the circumferential outer wall of the end of the rotating shaft 1. In this embodiment, the engaging protrusion 111 is a spline tooth structure, and a plurality of engaging protrusions 111 are evenly spaced in the circumferential direction of the rotating shaft 1. The engaging protrusion 111 of the rotating shaft 1 is a transmission engaging portion 11. An axial limiting portion 12 is also provided on the rotating shaft 1 on the outer side of the transmission engaging portion 11. The end face of the first limiting ring 21 fits with the axial limiting portion 12 to prevent it from falling out of the end of the rotating shaft 1. An annular groove 13 is provided at the front end of the fourth limiting ring 24 on the rotating shaft 1, and a retaining ring 4 is provided in the annular groove 13. An elastic member 5 is provided on the rotating shaft 1 between the retaining ring 4 and the fourth limiting ring 24.

[0027] The elastic member 5 in this embodiment may be a wave spring, a spiral spring or a butterfly spring.

[0028] The second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are all rotatably connected to the rotating shaft 1, and the first limiting ring 21, the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are sequentially fitted with each other; the first limiting ring 21, the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are respectively provided with a first limiting protrusion 211, a second limiting protrusion 221, a third limiting protrusion 231 and a fourth limiting protrusion 241 on the circumferential side walls, and the first limiting protrusion 211, the second limiting protrusion 221, the third limiting protrusion 231 and the fourth limiting protrusion 241 can be sequentially fitted with each other in the circumferential direction;

[0029] A blocking member 3 is further disposed on the periphery of the rotating shaft 1 . The blocking member 3 is an annular structure and is provided with a blocking protrusion 31 that can fit with the fourth limiting protrusion 241 in the circumferential direction.

[0030] Furthermore, the axial limiting portion 12 is a shoulder structure provided at the end of the rotating shaft 1 .

[0031] Furthermore, a copper sleeve 6 is fixedly provided on the outer wall of the rotating shaft 1 at positions corresponding to the second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24. The second limiting ring 22, the third limiting ring 23 and the fourth limiting ring 24 are all rotatably connected to the rotating shaft 1 through the copper sleeve 6, and the outer diameter of the copper sleeve 6 is smaller than the inner diameter of the first limiting ring 21.

[0032] Compared with the first embodiment, the novel automobile wire-controlled steering system limit device disclosed in the present embodiment changes the installation method of the multi-stage rotation limit mechanism 2 and the rotating shaft 1. The first limit ring 21 is slidably nested on the transmission meshing part 11 on the rotating shaft 1, and the first limit ring 21 is fitted with the axial limit part 12. The elastic force applied to the fourth limit ring 24 by the elastic member 5 makes the first limit ring 21, the second limit ring 22, the third limit ring 23 and the fourth limit ring 24 fit each other, thereby reducing the wear between the first limit ring 21, the second limit ring 22, the third limit ring 23 and the fourth limit ring 24, and the copper sleeve 6 is used to prevent the second limit ring 22, the third limit ring 23 and the fourth limit ring 24 from causing friction damage to the rotating shaft 1, thereby improving the service life of the limit device and facilitating installation.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel limit device for a steering-by-wire system of an automobile, comprising a multi-stage rotation limit mechanism provided on a rotating shaft, characterized in that: The multi-stage rotation limiting mechanism comprises a first limiting ring, a second limiting ring, a third limiting ring and a fourth limiting ring which are sequentially sleeved on the rotating shaft, and the first limiting ring is sleeved on a transmission meshing portion provided at the end of the rotating shaft, the circumferential inner wall structure of the first limiting ring is adapted to the transmission meshing portion and can rotate coaxially with the rotating shaft, the second limiting ring, the third limiting ring and the fourth limiting ring are all rotatably connected to the rotating shaft, and the first limiting ring, the second limiting ring, the third limiting ring and the fourth limiting ring are sequentially fitted with each other ; The first limiting protrusion, the second limiting protrusion, the third limiting protrusion and the fourth limiting protrusion are respectively provided on the circumferential side walls of the first limiting ring, the second limiting ring, the third limiting ring and the fourth limiting ring, and the first limiting protrusion, the second limiting protrusion, the third limiting protrusion and the fourth limiting protrusion can be sequentially fitted with each other in the circumferential direction; A blocking member is also provided on the periphery of the rotating shaft, and the blocking member is a ring-shaped structure, and a blocking protrusion is provided on the blocking member which can fit with the fourth limiting protrusion in the circumferential direction.

2. A novel automobile steer-by-wire system limiter according to claim 1, characterized in that: The end of the rotating shaft is a stepped shaft structure with a reduced diameter, the tail of the convex shaft at the end of the rotating shaft is a non-circular cylindrical structure, and the tail of the convex shaft at the end of the rotating shaft is a transmission engaging part, the fourth limiting ring is in contact with the step of the rotating shaft, and the first limiting ring is fixedly nested on the transmission engaging part.

3. The novel automobile steer-by-wire system limiter according to claim 1 is characterized in that: An engaging protrusion is provided on the circumferential outer wall at the end of the rotating shaft, and the engaging protrusion of the rotating shaft is a transmission engaging part. An axial limiting part is also provided on the rotating shaft on the outside of the transmission engaging part, and the end face of the terminal end of the first limiting ring is in contact with the axial limiting part to prevent it from falling off from the end of the rotating shaft; an annular groove is provided on the rotating shaft at the front end of the fourth limiting ring, and a retaining spring is provided in the annular groove, and an elastic part is provided on the rotating shaft between the retaining spring and the fourth limiting ring.

4. The novel automobile steer-by-wire system limiter according to claim 3 is characterized in that: The axial limiting portion is a shoulder structure provided at the end of the rotating shaft.

5. The novel automobile steer-by-wire system limiter according to claim 1 is characterized in that: A copper sleeve is fixed on the outer wall of the rotating shaft at the positions corresponding to the second limiting ring, the third limiting ring and the fourth limiting ring. The second limiting ring, the third limiting ring and the fourth limiting ring are all rotatably connected to the rotating shaft through the copper sleeve, and the outer diameter of the copper sleeve is smaller than the inner diameter of the first limiting ring.

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