Steering system angle limiting device and vehicle

Abstract

The application provides a steering system angle limiting device and a vehicle, the steering system angle limiting device comprising: a shell, the shell having a mounting cavity therein; an angle limiting component, comprising a main transmission wheel, a delay ring, a stop cam and a transmission cam arranged in sequence, the side of the main transmission wheel close to the delay ring being provided with a first limiting protrusion and a second limiting protrusion, the side of the delay ring close to the main transmission wheel being provided with a third limiting protrusion, and the other side being provided with a fourth limiting protrusion, the side of the stop cam close to the delay ring being provided with a fifth limiting protrusion, and the other side being provided with a first curved edge, the side of the transmission cam close to the stop cam being provided with a second curved edge, and the side of the second curved edge being provided with a sixth limiting protrusion; and a driving shaft, movably arranged in the mounting cavity and drivingly connected with the main transmission wheel. The steering system angle limiting device and the vehicle provided by the application have simple structure, convenient assembly process and low cost.

Description

Technical Field

[0001] This invention relates to the field of steering system technology, and more particularly to a steering system angle limiting device and a vehicle. Background Technology

[0002] A steer-by-wire system connects the driver's input interface (steering wheel) and the actuator (steering wheel) via electronic signals. The steering wheel needs to limit the range of rotation angle to prevent the clock spring from breaking due to excessive rotation. Typically, steer-by-wire systems rely on a controller to control a hand-feed motor to limit the steering wheel angle. However, this limitation is lost when power is off or control fails, thus compromising the protection of the clock spring. Therefore, to protect the clock spring, an alternative angle limiting device is needed to limit the steering wheel rotation. Furthermore, during the operation of this device, the mechanical structure must meet certain torsional resistance requirements to prevent excessive torque on the steering wheel from damaging the limiting device and causing it to malfunction, thus failing to protect the clock spring. Traditional torsional limiting structures are often too weak or prone to jamming during limiting, and they also lack sufficient torsional load-bearing capacity. Summary of the Invention

[0003] This invention provides a steering system angle limiting device and vehicle, aiming to solve the problem that the torque limiting structure of the steering system in traditional technology is too weak and does not have a large torsional load-bearing capacity.

[0004] To address the above problems, the present invention provides a steering system angle limiting device, comprising:

[0005] A housing having a mounting cavity inside;

[0006] An angle limiting assembly, disposed within the mounting cavity, includes a main drive wheel, a delay ring, a stop cam, and a transmission cam arranged sequentially. The main drive wheel has a first limiting protrusion and a second limiting protrusion on the side near the delay ring. The delay ring has a third limiting protrusion on the side near the main drive wheel and a fourth limiting protrusion on the other side. The stop cam has a fifth limiting protrusion on the side near the delay ring and a first curved edge on the other side. The transmission cam has a second curved edge on the side near the stop cam and abuts against the housing on the other side. A sixth limiting protrusion is located on one side of the second curved edge.

[0007] A drive shaft is movably disposed in the mounting cavity and drivenly connected to the main drive wheel. The delay ring, the stop cam, and the transmission cam are sequentially movably disposed on the drive shaft.

[0008] Wherein, the first limiting protrusion is used to abut against the third limiting protrusion after the main drive wheel rotates by a preset angle, the fourth limiting protrusion is used to abut against the sixth limiting protrusion after the delay ring rotates by a preset angle, the first curved surface edge is used to abut against the second curved surface edge, so that the stop cam has a stroke along the axial direction of the drive shaft when the drive cam rotates, and the fifth limiting protrusion is used to abut against the second limiting protrusion when the stop cam moves to a preset position to restrict the rotation of the drive shaft.

[0009] According to the present invention, a steering system angle limiting device includes a delay ring comprising a first ring body and a first annular boss disposed on the first ring body, wherein the edge of the first annular boss is provided with the third limiting protrusion and the inner wall of the first ring body is provided with the fourth limiting protrusion.

[0010] According to the present invention, a steering system angle limiting device is provided, wherein the angle limiting component includes two delay rings, a third limiting protrusion of the delay ring near the main drive wheel is used to abut against the first limiting protrusion, a fourth limiting protrusion is used to abut against the third limiting protrusion of the other delay ring, and the fourth limiting protrusion of the other delay ring is used to abut against the sixth limiting protrusion.

[0011] According to the present invention, a steering system angle limiting device includes a stop cam comprising a second ring body and a second annular boss disposed on the second ring body, wherein a mounting groove is formed between the second ring body and the second annular boss, and a delay ring is disposed in the mounting groove; the second annular boss is provided with a fifth limiting protrusion on one side near the delay ring, and a second curved edge is formed on the other side, and the second ring body is sleeved on the outer periphery of the transmission cam.

[0012] According to the present invention, a steering system angle limiting device is provided, wherein the main drive wheel is provided with four second limiting protrusions, the four second limiting protrusions are distributed in a cross shape, and the first limiting protrusion is provided at one end of one of the second limiting protrusions near the drive shaft.

[0013] According to the present invention, a steering system angle limiting device is provided, wherein four fifth limiting protrusions are provided on the periphery of the second annular protrusion, and each fifth limiting protrusion is distributed in a cross shape.

[0014] According to the present invention, a steering system angle limiting device is provided, wherein a limiting groove is formed on the inner wall of the mounting cavity, the limiting groove extends along the axial direction of the drive shaft, and a sliding block is correspondingly provided on the circumferential side of the second ring body, the sliding block being slidably connected to the limiting groove.

[0015] According to the present invention, a steering system angle limiting device further includes a return spring, which is sleeved outside the main drive wheel and the second annular boss.

[0016] According to a steering system angle limiting device provided by the present invention, the outer periphery of the drive shaft is provided with a plurality of annular mounting steps arranged sequentially, and each annular mounting step is used to install the angle limiting component respectively.

[0017] The present invention also provides a vehicle including a steering system angle limiting device as described in any of the preceding claims.

[0018] In the technical solution provided by this invention, the drive shaft and the main drive wheel rotate around an axis. After the main drive wheel rotates a certain angle, it mechanically contacts the delay ring and moves at the same speed. After the delay ring rotates a certain angle, it mechanically contacts the transmission cam and moves at the same speed. When the transmission cam rotates, it drives the stop cam to move axially toward the main drive wheel. After the stop cam rotates a certain angle, it contacts its main drive wheel, thus restricting the rotational movement of the main drive wheel and the drive shaft, thereby achieving the angle limiting function. The steer-by-wire system angle limiting device provided by this invention has a simple structure, convenient assembly process, and low cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the steering system angle limiting device provided by the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the disassembled structure;

[0022] Figure 3 yes Figure 1 A schematic diagram of the first partial disassembly structure;

[0023] Figure 4 yes Figure 1 A schematic diagram of the second partial disassembly structure;

[0024] Reference numerals: 10: Steering system angle limiting device; 100: Housing; 110: Mounting cavity; 120: Limiting groove; 200: Angle limiting assembly; 210: Main drive wheel; 211: First limiting protrusion; 212: Second limiting protrusion; 220: Delay ring; 221: Third limiting protrusion; 222: Fourth limiting protrusion; 223: First ring body; 224: First annular boss; 230: Stop cam; 231: Fifth limiting protrusion; 232: First curved edge; 233: Second ring body; 234: Second annular boss; 235: Mounting through groove; 236: Sliding block; 240: Transmission cam; 241: Second curved edge; 242: Sixth limiting protrusion; 250: Return spring; 300: Drive shaft; 310: Annular mounting step. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] 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," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of the present invention, 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 the present invention based on the specific circumstances.

[0028] In embodiments of the present invention, unless otherwise explicitly 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.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] The following is combined Figures 1-4 The present invention describes the steering system angle limiting device 10 and a vehicle.

[0031] Given that traditional steering systems suffer from overly weak torsional limiting structures that lack sufficient torsional load-bearing capacity, please refer to [the relevant documentation / reference]. Figure 1 The present invention provides a steering system angle limiting device 10, including a housing 100, an angle limiting component 200 and a drive shaft 300.

[0032] The housing 100 has a mounting cavity 110, and the housing 100 is fixed to the external positioning connection by a stop and bolts. The angle limiting assembly 200 is disposed in the mounting cavity 110, including a main drive wheel 210, a delay ring 220, a stop cam 230 and a transmission cam 240 arranged in sequence. The main drive wheel 210 has a first limiting protrusion 211 and a second limiting protrusion 212 on the side near the delay ring 220. The delay ring 220 has a third limiting protrusion 221 on the side near the main drive wheel 210 and a fourth limiting protrusion 222 on the other side. The stop cam 230 has a fifth limiting protrusion 231 on the side near the delay ring 220 and a first curved edge 232 on the other side. The transmission cam 240 has a second curved edge 241 on the side near the stop cam 230 and abuts against the housing 100 on the other side. A sixth limiting protrusion 242 is provided on one side of the second curved edge 241. The drive shaft 300 is movably disposed in the mounting cavity 110 and is drivenly connected to the main drive wheel 210. The delay ring 220, the stop cam 230 and the transmission cam 240 are movably disposed on the drive shaft 300 in sequence.

[0033] The first limiting protrusion 211 is used to abut against the third limiting protrusion 221 after the main drive wheel 210 rotates by a preset angle; the fourth limiting protrusion 222 is used to abut against the sixth limiting protrusion 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 that moves along the axial direction of the drive shaft 300 when the drive cam 240 rotates; and the fifth limiting protrusion 231 is used to abut against the second limiting protrusion 212 when the stop cam 230 moves to a preset position to limit the rotation of the drive shaft 300.

[0034] It should be noted that the drive shaft 300 is connected to the main drive wheel 210 via a spline feature. When the drive shaft 300 rotates, the rotation angle and torque it transmits are mechanically contacted by the first limiting protrusion 211 on the main drive wheel 210 after rotating a certain angle, and then make contact with the third limiting protrusion 231 on the delay ring 220, thereby driving the delay ring 220 to rotate. The delay ring 220 and the main drive wheel 210 begin to move synchronously. After rotating a certain angle, the fourth limiting protrusion 232 on the delay ring 220 contacts the transmission cam 24. The sixth limiting protrusion 242 on the drive cam 240 contacts and drives the transmission cam 240 to rotate. When the transmission cam 240 rotates, the first curved surface edge 232 and the second curved surface edge 241 change from meshing to misalignment, thereby driving the stop cam 230 to move axially towards the main transmission wheel 210. When the stop cam 230 rises to a preset position, the fifth limiting protrusion 231 on it abuts against the second limiting protrusion 212 of the main transmission wheel 210, restricting the rotation of the main transmission wheel 210 and the drive shaft 300, thereby achieving the stopping effect. In the technical solution provided by the present invention, the main transmission wheel 210, the delay ring 220, and the transmission cam 240 all rotate by a preset angle. The superposition of the preset angles is the turning angle. That is, by setting each preset angle, the effect of limiting at the preset turning angle can be achieved.

[0035] Specifically, please refer to Figures 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. The edge of the first annular boss 224 is provided with a third limiting protrusion 221, and the inner wall of the first ring body 223 is provided with a fourth limiting protrusion 222. As mentioned above, the limiting at a preset steering angle can be achieved by setting the rotation angle of each component. In order to improve the limiting range of the steering angle, in the technical solution provided by the present invention, the angle limiting component 200 includes two delay rings 220. The third limiting protrusion 221 of the delay ring 220 near the main drive wheel 210 is used to abut against the first limiting protrusion 211, the fourth limiting protrusion 222 is used to abut against the third limiting protrusion 221 of the other delay ring 220, and the fourth limiting protrusion 222 of the other delay ring 220 is used to abut against the sixth limiting protrusion 242. It should be noted that, since the delay ring 220 is designed with a ring body and a boss in a mating configuration, when two delay rings 220 are stacked, the boss of one delay ring 220 can extend into the ring body of the other delay ring 220. This reduces the assembly volume of the two delay rings 220, thereby reducing the overall size of the device. By setting two delay rings 220, the limiting range of the steering angle can be significantly increased. Of course, setting one or three delay rings 220 is also possible, and the specific configuration can be determined according to actual needs. This invention does not limit this.

[0036] Furthermore, the stop cam 230 includes a second ring body 233 and a second annular boss 234 disposed on the second ring body 233. A mounting groove 235 is formed between the second ring body 233 and the second annular boss 234, and a delay ring 220 is disposed within the mounting groove 235. It should be noted that the delay ring 220 is disposed within the mounting groove 235, and its fourth limiting protrusion 232 can abut against the sixth limiting protrusion 242 on the transmission cam 240 without being disturbed by the stop cam 230, thus achieving the effect of moving together with the transmission cam 240. After the transmission cam 240 rotates, the stop cam 230 can move axially without being disturbed by the delay ring 220, thus cooperating with the main transmission wheel 210. Correspondingly, the second annular boss 234 has a fifth limiting protrusion 231 on one side near the delay ring 220, and a second curved edge 241 is formed on the other side. The second ring body 233 is sleeved on the outer periphery of the transmission cam 240. It should be noted that the stop cam 230 is also designed as a ring body and a boss, which can reduce the assembly volume during assembly and further reduce the size of the device.

[0037] Furthermore, the main drive wheel 210 is provided with four second limiting protrusions 212, which are arranged in a cross shape. A first limiting protrusion 211 is located at one end of one of the second limiting protrusions 212 near the drive shaft 300. It should be noted that the delay ring 220 is smaller than the main drive wheel 210. Therefore, when the main drive wheel 210 moves, its inner first limiting protrusion 211 first engages with the third limiting protrusion 221 on the delay ring 220. When the stop cam 230 moves close to the main drive wheel 210, the outer second limiting protrusion 212 engages with the fifth limiting protrusion 231. Correspondingly, the second annular boss 234 on the stop cam 230 has four fifth limiting protrusions 231 arranged in a cross shape. By setting four second limiting protrusions 212 and five limiting protrusions 231, a wider range of steering angle limitations can be achieved.

[0038] As mentioned above, when the first curved surface edge 232 and the second curved surface edge 241 are misaligned, the stop cam 230 can be driven to move axially along the drive shaft 300. To limit the movement path of the stop cam 230, in the technical solution provided by this invention, a limiting groove 120 is formed in the inner wall of the mounting cavity 110. The limiting groove 120 extends axially along the drive shaft 300, and a sliding block 236 is correspondingly provided on the circumference of the second ring 233, which is slidably connected to the limiting groove 120. Through the limitation of the limiting groove 120, the stop cam 230 can move forward along the axial direction of the drive shaft 300 to the main drive wheel 210 without axial rotation. After the main drive wheel 210 rotates a certain angle, it can abut against the stop cam 230, achieving the effect of steering limitation.

[0039] When the stop cam 230 moves to abut against the main drive wheel 210, the torque input from the main drive wheel 210 is transmitted to the housing 100 through the fifth limiting protrusion 231 on the stop cam 230, achieving an anti-torsional effect capable of withstanding large loads, while the large torque is not transmitted through other parts. After the stop cam 230 abuts against the main drive wheel 210 to achieve the limiting effect, the stop cam 230 needs to return to its original position. The corresponding angle limiting component 200 also includes a return spring 250, which is sleeved outside the main drive wheel 210 and the second annular protrusion 234. When the return spring 250 is compressed by the stop cam 230, it can provide elastic force to return the stop cam 230 to its original position.

[0040] Please see Figure 2 The outer periphery of the drive shaft 300 is provided with a plurality of annular mounting steps 310 arranged in sequence. The annular mounting steps 310 are used to install the angle limiting components 200 respectively, so that the installation of each mounting component of the angle limiting components 200 will not interfere with each other and achieve the effect of positioning installation.

[0041] The present invention also provides a vehicle including the above-mentioned steering system angle limiting device 10. Since the main improvement of the present invention is in the steering system limiting device, the relevant features of the vehicle will not be described in detail.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steering system angle limiting device, characterized in that, include: A housing having a mounting cavity inside; An angle limiting assembly, disposed within the mounting cavity, includes a main drive wheel, a delay ring, a stop cam, and a transmission cam arranged sequentially. The main drive wheel has a first limiting protrusion and a second limiting protrusion on the side near the delay ring. The delay ring has a third limiting protrusion on the side near the main drive wheel and a fourth limiting protrusion on the other side. The stop cam has a fifth limiting protrusion on the side near the delay ring and a first curved edge on the other side. The transmission cam has a second curved edge on the side near the stop cam and abuts against the housing on the other side. A sixth limiting protrusion is located on one side of the second curved edge. A drive shaft is movably disposed in the mounting cavity and drivenly connected to the main drive wheel. The delay ring, the stop cam, and the transmission cam are sequentially movably disposed on the drive shaft. Wherein, the first limiting protrusion is used to abut against the third limiting protrusion after the main drive wheel rotates by a preset angle, the fourth limiting protrusion is used to abut against the sixth limiting protrusion after the delay ring rotates by a preset angle, the first curved surface edge is used to abut against the second curved surface edge, so that the stop cam has a stroke that moves axially along the drive shaft when the drive cam rotates, and the fifth limiting protrusion is used to abut against the second limiting protrusion when the stop cam moves to a preset position to restrict the rotation of the drive shaft; The stop cam includes a second ring body and a second annular boss on the second ring body. A mounting groove is formed between the second ring body and the second annular boss. The delay ring is disposed in the mounting groove. The second annular boss is provided with the fifth limiting protrusion on one side near the delay ring, and the first curved edge is formed on the other side. The second ring body is sleeved on the outer periphery of the transmission cam.

2. The steering system angle limiting device according to claim 1, characterized in that, The delay ring includes a first ring body and a first annular protrusion disposed on the first ring body. The edge of the first annular protrusion is provided with the third limiting protrusion, and the inner wall of the first ring body is provided with the fourth limiting protrusion.

3. The steering system angle limiting device according to claim 2, characterized in that, The angle limiting assembly includes two delay rings. The third limiting protrusion of the delay ring closest to the main drive wheel is used to abut against the first limiting protrusion. The fourth limiting protrusion is used to abut against the third limiting protrusion of the other delay ring. The fourth limiting protrusion of the other delay ring is used to abut against the sixth limiting protrusion.

4. The steering system angle limiting device according to claim 1, characterized in that, The main drive wheel is provided with four second limiting protrusions, which are arranged in a cross shape. The first limiting protrusion is located at one end of one of the second limiting protrusions near the drive shaft.

5. The steering system angle limiting device according to claim 4, characterized in that, The second annular protrusion has four fifth limiting protrusions on its periphery, and each fifth limiting protrusion is arranged in a cross shape.

6. The steering system angle limiting device according to claim 1, characterized in that, The inner wall of the mounting cavity is provided with a limiting groove, which extends along the axial direction of the drive shaft. A sliding block is provided on the circumference of the second ring body, and the sliding block is slidably connected to the limiting groove.

7. The steering system angle limiting device according to claim 1, characterized in that, The angle limiting component also includes a return spring, which is sleeved outside the main drive wheel and the second annular boss.

8. The steering system angle limiting device according to claim 1, characterized in that, The outer periphery of the drive shaft is provided with a plurality of annular mounting steps arranged in sequence, and each annular mounting step is used to install the angle limiting component respectively.

9. A vehicle, characterized in that, Includes the steering system angle limiting device as described in any one of claims 1-8.

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