CN117901946A - Steering system angle limiting device and vehicle - Google Patents

Abstract

The invention provides a steering system angle limiting device and a vehicle, wherein the steering system angle limiting device comprises: the shell is internally provided with an installation cavity; the angle limiting assembly comprises a main driving wheel, a delay ring, a stop cam and a transmission cam which are sequentially arranged, wherein one side of the main driving wheel, which is close to the delay ring, is provided with a first limiting lug and a second limiting lug respectively; and the driving shaft is movably arranged in the mounting cavity and is in driving connection with the main driving wheel. The steering system angle limiting device and the vehicle provided by the invention have the advantages of simple structure, convenience in assembly process and lower cost.

Description

Steering system angle limiting device and vehicle

Technical Field

The invention relates to the technical field of steering systems, in particular to an angle limiting device of a steering system and a vehicle.

Background

The steer-by-wire system is connected between a driver input interface (steering wheel) and an actuating mechanism (steering wheel) through a wire control (electronic signal), and the steering wheel end needs to limit the range of a rotation angle so as to avoid the breakage of a clock spring caused by the overrun of the rotation angle. In a conventional steer-by-wire system, the steering angle of the steering wheel is limited by controlling the hand motor by a controller, but the limitation of the steering angle of the steering wheel cannot be realized when the power is turned off or the control fails, so that the protection of the clock spring is lost. Therefore, another angle limiting device is needed to realize the limiting function of the steering wheel angle rotation in order to protect the clock spring. In the effective process of the device, the mechanical structure may meet a certain torsion resistance requirement so as to prevent the excessive torque at the steering wheel end from damaging and failing the limiting device, thereby leading to the functional failure of the clock spring. The torsion limiting structure in the traditional technology is too weak or the phenomenon that the mechanism is blocked and cannot return when the limit mechanism exists, and the torsion limiting structure also does not have larger torsion resistance bearing capacity.

Disclosure of Invention

The invention provides a steering system angle limiting device and a vehicle, and aims to solve the problems that a steering system in the prior art is too weak in torsion limiting structure and does not have larger torsion resistance bearing capacity.

In order to solve the above problems, the present invention provides a steering system angle limiting device, comprising:

the shell is internally provided with an installation cavity;

the angle limiting assembly is arranged in the mounting cavity and comprises a main driving wheel, a delay ring, a stop cam and a transmission cam which are sequentially arranged, wherein a first limiting lug and a second limiting lug are respectively arranged on one side, close to the delay ring, of the main driving wheel, a third limiting lug is arranged on one side, close to the main driving wheel, of the delay ring, a fourth limiting lug is arranged on the other side, a fifth limiting lug is arranged on one side, close to the delay ring, of the stop cam, a first curved edge is arranged on the other side, a second curved edge is arranged on one side, close to the stop cam, of the transmission cam, the other side is in butt joint with the shell, and a sixth limiting lug is arranged on one side of the second curved edge; and

The driving shaft is movably arranged in the mounting cavity and is in driving connection with the main driving wheel, and the delay ring, the stop cam and the driving cam are sequentially and movably arranged on the driving shaft;

The first limiting lug is used for being abutted with the third limiting lug after the main driving wheel rotates by a preset angle, the fourth limiting lug is used for being abutted with the sixth limiting lug after the delay ring rotates by the preset angle, the first curved surface edge is used for being abutted with the second curved surface edge, the stop cam is enabled to have a stroke along the axial movement of the driving shaft when the driving cam rotates, and the fifth limiting lug is used for being abutted with the second limiting lug when the stop cam moves to a preset position so as to limit the rotation of the driving shaft.

According to the steering system angle limiting device provided by the invention, the delay ring comprises the first ring body and the first annular boss arranged on the first ring body, the third limiting lug is arranged at the edge of the first annular boss, and the fourth limiting lug is arranged on the inner wall of the first ring body.

According to the steering system angle limiting device provided by the invention, the angle limiting assembly comprises two delay rings, the third limiting lug of the delay ring close to the main driving wheel is used for being abutted with the first limiting lug, the fourth limiting lug is used for being abutted with the third limiting lug of the other delay ring, and the fourth limiting lug of the other delay ring is used for being abutted with the sixth limiting lug.

According to the steering system angle limiting device provided by the invention, the stop cam comprises a second ring body and a second annular boss arranged on the second ring body, a mounting through groove is formed between the second ring body and the second annular boss, and the delay ring is arranged in the mounting through groove; one side of the second annular boss, which is close to the delay ring, is provided with a fifth limit lug, the other side of the second annular boss forms a second curved surface edge, and the second annular body is sleeved on the periphery of the transmission cam.

According to the steering system angle limiting device provided by the invention, the four second limiting convex blocks are arranged on the main driving wheel and distributed in a cross shape, and the first limiting convex block is arranged at one end of one of the second limiting convex blocks, which is close to the driving shaft.

According to the steering system angle limiting device provided by the invention, four fifth limiting convex blocks are arranged on the periphery of the second annular boss, and each fifth limiting convex block is distributed in a cross shape.

According to the steering system angle limiting device provided by the invention, the inner wall of the mounting cavity is provided with the limiting groove, the limiting groove extends along the axial direction of the driving shaft, the periphery of the second ring body is correspondingly provided with the sliding block, and the sliding block is in sliding connection with the limiting groove.

According to the angle limiting device of the steering system, the angle limiting assembly further comprises a reset spring, and the reset spring is sleeved outside the main driving wheel and the second annular boss.

According to the steering system angle limiting device provided by the invention, the periphery of the driving shaft is provided with the annular mounting steps in sequence, and each annular mounting step is used for respectively mounting the angle limiting assembly.

The invention also provides a vehicle comprising a steering system angle limiting device as claimed in any one of the preceding claims.

In the technical scheme provided by the invention, the driving shaft and the main driving wheel rotate around the axis, the main driving wheel rotates for a certain angle and then mechanically contacts with the delay ring and moves at the same rotating speed, the delay ring rotates for a certain angle and then mechanically contacts with the driving cam and moves at the same rotating speed, the driving cam drives the stop cam to move towards the main driving wheel along the axial direction when rotating, and the stop cam contacts with the main driving wheel after rotating for a certain angle, so that the rotation of the main driving wheel and the driving shaft is limited, and the angle limiting function is realized. The angle limiting device of the steer-by-wire system provided by the invention has the advantages of simple structure, convenience in assembly process and lower cost.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a steering system angle limiting device provided by the invention;

FIG. 2 is a schematic illustration of the disassembled structure of FIG. 1;

FIG. 3 is a schematic view of the first partially disassembled structure of FIG. 1;

FIG. 4 is a schematic view of the second partially disassembled structure of FIG. 1;

Reference numerals: 10: an angle limiting device of the steering system; 100: a housing; 110: a mounting cavity; 120: a limit groove; 200: an angle limiting assembly; 210: a main driving wheel; 211: a first limit bump; 212: the second limit bump; 220: a delay loop; 221: a third limit bump; 222: a fourth limit bump; 223: a first ring body; 224: a first annular boss; 230: a stop cam; 231: a fifth limit bump; 232: a first curved surface edge; 233: a second ring body; 234: a second annular boss; 235: installing a through groove; 236: a sliding block; 240: a drive cam; 241: a second curved edge; 242: a sixth limit bump; 250: a return spring; 300: a drive shaft; 310: and an annular mounting step.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.

In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The steering system angle limiting device 10 and the vehicle of the present invention are described below with reference to fig. 1-4.

In view of the problem that the torsion limiting structure of the steering system is too weak and does not have a large torsion resistance bearing capacity in the prior art. Referring to fig. 1, the present invention provides a steering system angle limiting device 10, which includes a housing 100, an angle limiting assembly 200, and a driving shaft 300.

The housing 100 is provided with an installation cavity 110 therein, and the housing 100 is fixedly connected with the outside through a spigot and a bolt. The angle limiting assembly 200 is arranged in the mounting cavity 110 and comprises a main driving wheel 210, a delay ring 220, a stop cam 230 and a transmission cam 240 which are sequentially arranged, wherein a first limiting lug 211 and a second limiting lug 212 are respectively arranged on one side, close to the delay ring 220, of the main driving wheel 210, a third limiting lug 221 is arranged on one side, close to the main driving wheel 210, of the delay ring 220, a fourth limiting lug 222 is arranged on the other side, a fifth limiting lug 231 is arranged on one side, close to the delay ring 220, of the stop cam 230, a first curved edge 232 is arranged on the other side, a second curved edge 241 is arranged on one side, close to the stop cam 230, of the transmission cam 240, the other side is in butt joint with the shell 100, and a sixth limiting lug 242 is arranged on one side of the second curved edge 241. The driving shaft 300 is movably disposed in the mounting cavity 110 and is in driving connection with the main driving wheel 210, and the delay ring 220, the stop cam 230 and the driving cam 240 are sequentially movably disposed in the driving shaft 300.

The first limit bump 211 is used to abut against the third limit bump 221 after the main driving wheel 210 rotates by a preset angle, the fourth limit bump 222 is used to abut against the sixth limit bump 242 after the delay ring 220 rotates by a preset angle, the first curved edge 232 is used to abut against the second curved edge 241, so that the stop cam 230 has a stroke moving along the axial direction of the driving shaft 300 when the driving cam 240 rotates, and the fifth limit bump 231 is used to abut against the second limit bump 212 to limit the rotation of the driving shaft 300 when the stop cam 230 moves to a preset position.

It should be noted that, when the driving shaft 300 rotates, the rotation angle and torque transmitted by the driving shaft 300 are mechanically contacted with the third limit bump 231 on the delay ring 220 after rotating by a certain angle through the first limit bump 211 on the main driving wheel 210, so as to drive the delay ring 220 to rotate, the delay ring 220 starts to synchronously move with the main driving wheel 210, the fourth limit bump 232 on the delay ring 220 contacts with the sixth limit bump 242 on the driving cam 240 after rotating by a certain angle and drives the driving cam 240 to rotate, and the first curved edge 232 and the second curved edge 241 become misplaced from engagement when the driving cam 240 rotates, so that the stop cam 230 is driven to move axially towards the main driving wheel 210, and when the stop cam 230 rises to a preset position, the fifth limit bump 231 on the stop cam is abutted with the second limit bump 212 of the main driving wheel 210, so as to limit the rotation of the main driving wheel 210 and the driving shaft 300, thereby achieving the stop effect. In the technical scheme provided by the invention, the main driving wheel 210, the delay ring 220 and the driving cam 240 are rotated by preset angles, and the superposition of the preset angles, namely the steering angle, can achieve the effect of limiting under the preset steering angle through setting each preset angle.

Specifically, referring to fig. 2-4, the delay ring 220 includes a first ring body 223 and a first annular boss 224 disposed on the first ring body 223, a third limiting bump 221 is disposed at an edge of the first annular boss 224, and a fourth limiting bump 222 is disposed on an inner wall of the first ring body 223. As described above, the rotation angle of each component may be set to reach the limit under the preset steering angle, so as to increase the limit range of the steering angle, in the technical solution provided by the present invention, the angle limiting assembly 200 includes two delay rings 220, the third limiting bump 221 of the delay ring 220 close to the main driving wheel 210 is used to abut against the first limiting bump 211, the fourth limiting bump 222 is used to abut against the third limiting bump 221 of the other delay ring 220, and the fourth limiting bump 222 of the other delay ring 220 is used to abut against the sixth limiting bump 242. It should be noted that, since the delay rings 220 are configured in a matching manner of the ring body and the boss, when the two delay rings 220 are overlapped with each other, the boss of one delay ring 220 can extend into the ring body of the other delay ring 220, so that the assembly volume of the two delay rings 220 can be reduced, and the volume of the whole device can be further reduced. The two delay rings 220 are provided, so that the limit range of the steering angle can be significantly increased, and of course, one or three delay rings 220 can be provided, and the invention is not limited thereto, and the delay rings can be specifically provided according to actual needs.

Further, the stop cam 230 includes a second ring 233 and a second annular boss 234 disposed on the second ring 233, a mounting through slot 235 is formed between the second ring 233 and the second annular boss 234, and the delay ring 220 is disposed in the mounting through slot 235. It should be noted that, the delay ring 220 is disposed in the mounting through groove 235, the fourth limit bump 232 thereon is not interfered by the stop cam 230 and is further abutted against the sixth limit bump 242 on the driving cam 240, so as to achieve the effect of moving together with the driving cam 240, and the stop cam 230 is not interfered by the delay ring 220 to move along the axial direction after the driving cam 240 rotates, so as to cooperate with the main driving wheel 210. Correspondingly, a fifth limit bump 231 is disposed on one side of the second annular boss 234 near the delay ring 220, a second curved edge 241 is formed on the other side, and the second ring 233 is sleeved on the periphery of the transmission cam 240. It should be noted that, the stop cam 230 is also configured in a form of matching the ring body with the boss, so that the assembly volume can be reduced during assembly, and the volume of the device can be further reduced.

Further, four second limiting protrusions 212 are disposed on the main driving wheel 210, the four second limiting protrusions 212 are distributed in a cross shape, and the first limiting protrusion 211 is disposed at one end of one of the second limiting protrusions 212 close to the driving shaft 300. It should be noted that, the size of the delay ring 220 is smaller than that of the main driving wheel 210, so that when the main driving wheel 210 moves, the first limit bump 211 on the inner side of the delay ring is in abutting engagement with the third limit bump 221 on the delay ring 220, and when the stop cam 230 moves to approach the main driving wheel 210, the second limit bump 212 on the outer side is in engagement with the fifth limit bump 231. Correspondingly, four fifth limit lugs 231 are arranged on the periphery of the second annular boss 234 on the stop cam 230, and the fifth limit lugs 231 are distributed in a cross shape. By providing four second limit projections 212 and fifth limit projections 231, a limitation of a larger range of steering angles can be achieved.

As described above, when the first curved edge 232 is misaligned with the second curved edge 241, the stopper cam 230 may be driven to move in the axial direction of the driving shaft 300. In order to limit the movement path of the stop cam 230, in the technical solution provided by the present invention, the inner wall of the installation cavity 110 is provided with a limiting groove 120, the limiting groove 120 extends along the axial direction of the driving shaft 300, and the circumferential side of the second ring body 233 is correspondingly provided with a sliding block 236, and the sliding block 236 is slidably connected to the limiting groove 120. The stop cam 230 can move forward along the axial direction of the driving shaft 300 to the main driving wheel 210 by the limitation of the limiting groove 120, and the main driving wheel 210 can be abutted with the stop cam 230 after rotating for a certain angle again without rotating in the axial direction, so as to achieve the effect of steering limitation.

When the stop cam 230 moves to abut against the main driving wheel 210, the torque input by the main driving wheel 210 is transmitted to the housing 100 through the fifth limit bump 231 on the stop cam 230, so that the torsion resistance capable of bearing a large load is realized, and a large torque is not transmitted through other parts. When the stop cam 230 abuts against the main driving wheel 210 to achieve the limit effect, the stop cam 230 is required to return to the original position, the corresponding angle limiting assembly 200 further comprises a return spring 250, the return spring 250 is sleeved outside the main driving wheel 210 and the second annular boss 234, and the return spring 250 can provide elastic force to return the stop cam 230 to the original position when being compressed by the stop cam 230.

Referring to fig. 2, the outer circumference of the driving shaft 300 is provided with a plurality of annular mounting steps 310 in sequence, and the annular mounting steps 310 are used for respectively mounting the angle limiting assemblies 200, so that the mounting components of the angle limiting assemblies 200 are mutually mounted without interference, and the positioning and mounting effects are achieved.

The invention also provides a vehicle comprising the steering system angle limiting device 10, and the main improvement point of the invention is the steering system limiting device, so that the relevant features of the vehicle are not repeated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An angle limiting device of a steering system, comprising:

the shell is internally provided with an installation cavity;

the angle limiting assembly is arranged in the mounting cavity and comprises a main driving wheel, a delay ring, a stop cam and a transmission cam which are sequentially arranged, wherein a first limiting lug and a second limiting lug are respectively arranged on one side, close to the delay ring, of the main driving wheel, a third limiting lug is arranged on one side, close to the main driving wheel, of the delay ring, a fourth limiting lug is arranged on the other side, a fifth limiting lug is arranged on one side, close to the delay ring, of the stop cam, a first curved edge is arranged on the other side, a second curved edge is arranged on one side, close to the stop cam, of the transmission cam, the other side is in butt joint with the shell, and a sixth limiting lug is arranged on one side of the second curved edge; and

The driving shaft is movably arranged in the mounting cavity and is in driving connection with the main driving wheel, and the delay ring, the stop cam and the driving cam are sequentially and movably arranged on the driving shaft;

The first limiting lug is used for being abutted with the third limiting lug after the main driving wheel rotates by a preset angle, the fourth limiting lug is used for being abutted with the sixth limiting lug after the delay ring rotates by the preset angle, the first curved surface edge is used for being abutted with the second curved surface edge, the stop cam is enabled to have a stroke along the axial movement of the driving shaft when the driving cam rotates, and the fifth limiting lug is used for being abutted with the second limiting lug when the stop cam moves to a preset position so as to limit the rotation of the driving shaft.

2. The steering system angle limiting device of claim 1, wherein the delay ring comprises a first ring body and a first annular boss arranged on the first ring body, the edge of the first annular boss is provided with the third limiting bump, and the inner wall of the first ring body is provided with the fourth limiting bump.

3. The steering system angle limiting device of claim 2, wherein the angle limiting assembly comprises two of the delay rings, the third limiting projection of the delay ring adjacent to the primary drive wheel is configured to abut the first limiting projection, the fourth limiting projection is configured to abut the third limiting projection of the other delay ring, and the fourth limiting projection of the other delay ring is configured to abut the sixth limiting projection.

4. The steering system angle limiting device of claim 1, wherein the stop cam comprises a second ring body and a second annular boss arranged on the second ring body, a mounting through groove is formed between the second ring body and the second annular boss, and the delay ring is arranged in the mounting through groove; one side of the second annular boss, which is close to the delay ring, is provided with a fifth limit lug, the other side of the second annular boss forms a second curved surface edge, and the second annular body is sleeved on the periphery of the transmission cam.

5. The steering system angle limiting device according to claim 4, wherein four second limiting projections are arranged on the main driving wheel, the four second limiting projections are distributed in a cross shape, and the first limiting projection is arranged at one end of one of the second limiting projections, which is close to the driving shaft.

6. The steering system angle limiting device of claim 5, wherein four fifth limiting projections are disposed on a peripheral side of the second annular boss, and each of the fifth limiting projections is distributed in a cross shape.

7. The steering system angle limiting device of claim 4, wherein the inner wall of the mounting cavity is provided with a limiting groove, the limiting groove extends along the axial direction of the driving shaft, and the circumferential side of the second ring body is correspondingly provided with a sliding block, and the sliding block is slidably connected with the limiting groove.

8. The steering system angle limiting device of claim 4, wherein the angle limiting assembly further comprises a return spring that is nested outside of the primary drive wheel and the second annular boss.

9. The steering system angle limiting device according to claim 1, wherein a plurality of annular mounting steps are sequentially provided on the outer periphery of the driving shaft, and each annular mounting step is used for mounting the angle limiting assembly.

10. A vehicle comprising a steering system angle limiting device as claimed in any one of claims 1 to 9.