CN218229120U

CN218229120U - Limiting device, steer-by-wire system and vehicle

Info

Publication number: CN218229120U
Application number: CN202222342585.8U
Authority: CN
Inventors: 许乐; 张洋; 周亮; 蒋荣勋
Original assignee: Suzhou Shidai Xin'an Energy Technology Co ltd
Current assignee: Suzhou Shidai Xin'an Energy Technology Co ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-01-06
Anticipated expiration: 2032-09-02

Abstract

The application discloses stop device, steer-by-wire system and vehicle. The limiting device comprises a shell, a rotating shaft, a lead screw, a first limiter, a second limiter and a ball returning device. The shell is internally provided with a limiting cavity. The rotating shaft is provided with a limiting shaft section. The lead screw sets up in spacing shaft part periphery, and the spiral is provided with first ball groove on the lead screw. The first limiter and the second limiter are arranged on the limiting shaft section and are respectively located at two ends of the lead screw. The sliding part is arranged in the limiting cavity and is connected with the shell in a sliding mode, the sliding part is sleeved on the outer periphery of the screw rod, a second ball groove is formed in the inner periphery of the sliding part, and the second ball groove is matched with part of the first ball grooves to form a ball channel. The ball returning device is provided with a ball returning channel, one end of the ball returning channel is communicated with one end of the ball channel, and the other end of the ball returning channel is communicated with the other end of the ball channel. Wherein, the sliding part is abutted against the first stopper or the second stopper through movement. Through the mode, the rotating shaft can be limited from rotating excessively.

Description

Limiting device, steer-by-wire system and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to a limiting device, a steer-by-wire system and a vehicle.

Background

In the related art, a steering wheel module and a steering gear of a steering system are generally connected by a mechanical component such as a universal joint or a gear, and the steering wheel module and the steering gear are mechanically driven. When the rotation angle of the steering wheel module of the steering system reaches the limit position, the rotation angle allowed by the structure of the steering machine reaches the limit. In other words, in the extreme position, the structure of the steering gear itself has a mechanical limit function. The mechanical limit of the steering engine can be transmitted to the steering wheel module through mechanical transmission of universal joints or gears and the like, so that the steering wheel module can be limited. However, steer-by-wire systems eliminate the mechanical connection between the steering wheel module and the steering gear. The steering wheel module and the steering machine adopt a local area network connection mode to transmit the rotation information of the steering wheel to the steering machine. This prevents the mechanical stops of the steering gear from being transmitted to the steering wheel module. When the steer-by-wire system steers, after the steering gear reaches the position of the rotation limit, the steering wheel can still continue to rotate because the mechanical limit can not be transmitted to the steering wheel. This may result in over-rotation of the steering wheel, which may cause the steering wheel module to become decoupled from the steering gear, resulting in an increased driving risk factor.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a limiting device, a steer-by-wire system and a vehicle, and can limit the rotating shaft from excessively rotating.

In a first aspect, an embodiment of the present application provides a limiting device. The limiting device comprises a shell, a rotating shaft, a lead screw, a first limiter, a second limiter and a ball returning device. The shell is internally provided with a limiting cavity. The pivot has spacing shaft part, and spacing shaft part at least part is worn to locate spacing cavity. The lead screw is arranged on the periphery of the limiting shaft section, and a first ball groove is spirally arranged on the lead screw. The first limiter is arranged on the limiting shaft section and is located at one end of the lead screw. The second stopper is arranged on the limiting shaft section and is located at the other end of the lead screw. The sliding part is arranged in the limiting cavity and is connected with the shell in a sliding mode, the sliding part is sleeved on the outer periphery of the screw rod, a second ball groove is formed in the inner periphery of the sliding part, and the second ball groove is matched with part of the first ball grooves to form a ball channel. The ball returning device is provided with a ball returning channel, one end of the ball returning channel is communicated with one end of the ball channel, and the other end of the ball returning channel is communicated with the other end of the ball channel so as to circulate the balls in the ball channel and the ball returning channel. The sliding part is abutted against the first limiting stopper or the second limiting stopper through movement so as to limit the rotation of the rotating shaft.

In a second aspect, embodiments of the present application provide a steer-by-wire system. The steer-by-wire system comprises a steering wheel, a steering column and the limiting device. The steering wheel is connected with the steering column and coaxially arranged, and the rotating shaft of the limiting device is connected with the steering column and coaxially arranged.

In a third aspect, embodiments of the present application provide a vehicle. The vehicle comprises a frame, wheels and the steer-by-wire system. The steer-by-wire system is arranged on the frame and is in transmission connection with the wheels.

The beneficial effect of this application is: in contrast to the prior art, the ball channel formed by the spindle and the slide and the ball return channel of the ball return device enable the balls to roll in the ball channel and the ball return channel. The rotating shaft can drive the lead screw to rotate in the rotating process, the ball can be enabled to roll by the rotation of the lead screw, and the rotation of the rotating shaft can be transmitted to the sliding part. Because the sliding part is connected with the shell in a sliding way, the rotation of the rotating shaft can be converted into the movement of the sliding part. Therefore, the transmission of the rotating shaft and the sliding part can be more accurate and is not easy to block by adopting a ball screw transmission mode. The rotation of the rotating shaft can be anticlockwise rotation or clockwise rotation. When the rotating shaft rotates anticlockwise, the sliding part moves towards one end of the rotating shaft along the axial direction of the rotating shaft. When the rotating shaft rotates clockwise, the sliding part moves towards the other end of the rotating shaft along the axial direction of the rotating shaft. When the sliding part moves to the two ends of the screw rod respectively along the axial direction of the rotating shaft, the sliding part can be abutted against the first limiting stopper or the second limiting stopper arranged at the two ends of the screw rod. When the sliding part is abutted against the first stopper, the sliding part can not move continuously towards the first stopper due to the limitation of the first stopper; when the sliding part is abutted against the second stopper, the sliding part can not move continuously towards the second stopper due to the limitation of the second stopper. After the sliding part can not move any more, the ball can not roll in the ball channel and the ball returning channel any more, so that the screw cannot rotate continuously, and further the rotating shaft cannot rotate continuously. So set up, just can restrict pivot clockwise or anticlockwise turned angle, make the pivot rotate certain angle back towards a direction, can be spacing by first stopper or second stopper to it is excessive to have restricted the pivot rotation.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a vehicle according to the present application;

FIG. 2 is a schematic structural view of the steer-by-wire system of the present application;

FIG. 3 is a schematic view of the stop device of the present application;

FIG. 4 is a schematic view of a detailed structure of an embodiment of the limiting device shown in FIG. 3;

figure 5 is a schematic view of an exploded view of the spacing device of figure 4;

FIG. 6 is a schematic view of a detail of another embodiment of the spacing device shown in FIG. 3;

FIG. 7 is a schematic view of a partial structure of the spacing device shown in FIG. 6;

FIG. 8 is a schematic view of an embodiment of a sliding part of the limiting device shown in FIG. 3

FIG. 9 is a schematic view showing another embodiment of a sliding portion of the stopper device shown in FIG. 3;

FIG. 10 is a schematic view of the first stop and screw of FIG. 4 in one embodiment;

FIG. 11 is a schematic view of an embodiment of the second stop of FIG. 4;

FIG. 12 is a schematic structural view of an embodiment of the first retainer, the second retainer and the lead screw of FIG. 7;

FIG. 13 is a schematic structural view of an embodiment of the first retainer, the second retainer and the lead screw of FIG. 4;

FIG. 14 is a schematic diagram of the structure of one embodiment of the first retainer, the second retainer, the lead screw, and the slide shown in FIG. 4;

FIG. 15 is a schematic structural view of an embodiment of the housing of FIG. 3;

fig. 16 is a schematic structural view of another embodiment of the housing of fig. 3.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Referring to fig. 1, an embodiment of a vehicle 1 of the present application includes a frame 20, wheels 30, and a steer-by-wire system 10. The steer-by-wire system 10 is disposed on the frame 20 and is in driving connection with the wheels 30. The wheels 30 may be mounted to the frame 20 via a knuckle or spindle, etc., and then connected to the engine via the driveline of the vehicle 1. The wheels 30 may include two steering wheels, and the steer-by-wire system 10 can drive the two steering wheels to perform a steering motion simultaneously under the command of a driver or an automatic steering system, so as to perform a steering operation on the vehicle 1.

Referring to fig. 2, the steer-by-wire system 10 includes a steering wheel 11, a steering column 12, and a stopper device 100. The steering wheel 11 is connected to a steering column 12 and is coaxially disposed. The driver can input steering information such as a steering angle or a torque required for steering the vehicle 1 by controlling the steering wheel 11, and the information can be transmitted to the steering column 12. The limiting device 100 can limit the maximum angle that the steering column 12 rotates towards one direction, so as to limit the over-steering of the steering column 12, further limit the continuous rotation of the steering wheel 11, and reduce the over-rotation of the steering wheel 11 by a driver.

The steer-by-wire system 10 further includes a steering sensor (not shown) and a steering gear (not shown). The steering sensor may be a rotation angle sensor or a torque sensor or the like. The steering column 12 may be connected to a steering sensor so that the steering sensor can detect parameters such as the angle of rotation and the torque of the steering wheel 11 through the steering column 12. The steering gear is in driving connection with the wheels 30 of the vehicle 1 and in communication with the steering sensor. Steering information such as a steering angle and a torque detected by the steering sensor can be transmitted to the steering machine, and the steering machine can control the wheels 30 to perform a steering motion according to the steering information. The steering gear or the wheels 30 may be provided with a travel sensor such as a displacement sensor, a rotation angle sensor, or a displacement sensor. The travel sensors are capable of detecting operating parameters of the wheels 30 or the steering gear for transmission to a central control system or other control elements of the vehicle 1.

The steer-by-wire system 10 further comprises a road sensing motor 13 and a speed reducer 14, wherein the road sensing motor 13 is in transmission connection with the speed reducer 14, and the speed reducer 14 is in transmission connection with the steering column 12. The speed reducer 14 can change the rotational speed and torque output by the road sensor motor 13, so that the output of the road sensor motor 13 can be adapted to the rotation of the steering column 12. Torque or other signals detected by the travel sensor can be transmitted to the road sensor motor 13. The road-sensing motor 13 can generate a torque according to road information such as a torque received by the steering wheel or the wheels 30 on an actual road, and transmit the torque to the steering wheel 11 through the steering column 12, so that a driver can determine an actual road condition according to the magnitude of the steering torque of the steering wheel 11, and the steering wheel 11 can adjust the rotation angle according to the road information.

The specific structure of the spacing device 100 will be described in detail below.

Referring to fig. 3 to 5, the position limiting device 100 includes a housing 120, a rotating shaft 110, a screw 130, a first position limiter 140, a second position limiter 150, and a sliding portion 160. The inside spacing cavity that has of casing 120, casing 120 can hold each part to can surround each part, thereby separate impurity such as outside dust of shelves, reduce inside each part and receive outside interference, increase the stability of work. The speed reducer 14 of the road sensing motor 13 has a housing, and the housing 120 of the position limiting device 100 is fixedly arranged relative to the housing, for example, detachably connected or integrally arranged. Specifically, the housing 120 may be provided with a flange, and the flange of the housing 120 and the outer shell of the decelerator 14 may be connected by fastening members such as bolts or rivets passing through the two. Or the housing 120 of the limiting device 100 and the casing of the reducer 14 may be integrally formed by casting or injection molding, and the like, and is not limited in particular.

The rotating shaft 110 is provided with a limiting shaft section, at least part of the limiting shaft section penetrates through the limiting cavity, and the rotating shaft 110 can rotate relative to the shell 120. The rotary shaft 110 is connected to the steering column 12 of the steer-by-wire system 10 and is coaxially disposed. The limiting shaft segment can carry and mount the screw 130, the first limiter 140, the second limiter 150, the sliding part 160, and the like. The rotating shaft 110 may be connected to and coaxially disposed with the steering column 12 of the steer-by-wire system 10, and the rotating shaft 110 may be capable of rotating along with the steering column 12 and the steering wheel 11. The rotation of the rotating shaft 110 is restricted, and the restricting action can be transmitted to the steering wheel 11 through the steering column 12. Alternatively, the steering column 12 in the steer-by-wire system 10 and the shaft 110 in the spacing device 100 may be the same part.

The lead screw 130 is arranged on the periphery of the limiting shaft section. The lead screw 130 can rotate following the rotation shaft 110. The lead screw 130 may be integrally disposed with the limiting shaft segment, for example, a section of thread is formed on the rotating shaft 110 by turning or the like. Or the lead screw 130 may be keyed to the stop shaft segment, such as by a flat key or spline, etc.

The first stopper 140 is disposed on the shaft-limiting section and located at one end of the screw 130. The second stopper 150 is disposed on the limiting shaft section and located at the other end of the screw 130. The sliding portion 160 is disposed in the limiting cavity, slidably connected to the housing 120, and threadedly connected to the lead screw 130, so that the rotating shaft 110 can drive the sliding portion 160 to move by rotating.

The stroke between the position where the sliding portion 160 abuts against the first stopper 140 and the position where the sliding portion 160 abuts against the second stopper 150 is the stroke of the sliding portion 160 on the screw 130. Optionally, the travel of the sliding part 160 on the lead screw 130 is smaller than the effective length of the thread on the lead screw 130. With such an arrangement, the sliding portion 160 does not move to the end of the thread length on the screw 130, and the situation that the torque required by the rotation of the rotating shaft 110 is increased due to the fact that the sliding portion 160 is screwed with the screw 130 tightly can be effectively reduced.

In another embodiment, referring to fig. 6, 9 and 12, the screw 130 is spirally provided with a first ball groove 131. The inner circumference of the sliding portion 160 is provided with a second ball groove 167, and the second ball groove 167 cooperates with a portion of the first ball groove 131 to form a ball passage (not labeled). The limiting device 100 further includes a ball returning device 180, the ball returning device 180 has a ball returning channel (not labeled), one end of the ball returning channel is communicated with one end of the ball channel, and the other end of the ball returning channel is communicated with the other end of the ball channel, so that balls (shown in fig. 9, but not labeled) of the ball channel and the ball returning channel circulate. Wherein, as the sliding portion 160 moves along the lead screw 130, the portion of the first ball groove 131 engaged with the second ball groove 167 is continuously changed.

The ball passage formed by the screw 130 and the sliding part 160 and the ball returning passage of the ball returning device 180 enable the balls to roll in the ball passage and the ball returning passage. The rotating shaft 110 can drive the screw 130 to rotate during the rotation process, and the rotation of the screw 130 can drive the balls to roll. As the balls roll in the ball passage and the ball return passage, the rotation of the rotation shaft 110 can be converted into the movement of the slide part 160. The stroke of the sliding portion 160 cannot exceed the length of the first ball groove 131 on the screw 130 by the ball transmission method, and even if torque is continuously applied when the sliding portion 160 abuts against the first stopper 140 or the second stopper 150, the relative movement between the sliding portion 160 and the screw 130 is not easily locked by the ball transmission method. The ball-driven type also has higher accuracy, and can more accurately control the relationship between the rotation angle of the rotating shaft 110 and the moving distance of the sliding part 160.

Further, in the above embodiment, the rotation shaft 110 can drive the lead screw 130 to rotate, and the rotation of the rotation shaft 110 can be converted into the movement of the sliding portion 160. The rotation shaft 110 may rotate counterclockwise or clockwise. For example, when the rotating shaft 110 rotates in one direction, the sliding portion 160 is driven to move towards one of the first stopper 140 and the second stopper 150 along the axial direction of the rotating shaft 110. When the rotating shaft 110 rotates in the other direction, the sliding portion 160 is driven to move towards the other of the first stopper 140 and the second stopper 150 along the axial direction of the rotating shaft 110. The specific embodiment of the relationship between the rotation direction of the rotating shaft 110 and the moving direction of the sliding part 160 can be determined by adjusting the rotation directions of the external thread of the lead screw 130 and the internal thread of the sliding part 160, or the rotation directions of the first ball groove 131 and the second ball groove 167 according to the specific design.

When the rotating shaft 110 rotates clockwise, the sliding part 160 moves towards the first stopper 140; when the rotating shaft 110 rotates counterclockwise, the sliding portion 160 moves toward the second stopper 150 for example, which is an exemplary description of the embodiment of the present application, and the same reason is not repeated in other embodiments.

When the rotation shaft 110 rotates clockwise, the sliding portion 160 moves toward the first stopper 140. When the sliding portion 160 abuts against the first stopper 140, the sliding portion 160 cannot move further in the direction of the first stopper 140, and the movement of the sliding portion 160 is restricted. Because the sliding portion 160 is in transmission connection with the lead screw 130, and the lead screw 130 and the rotating shaft 110 rotate coaxially, after the movement of the sliding portion 160 is limited, the rotation of the rotating shaft 110 is also limited, that is, the movement of the sliding portion 160 towards the first stopper 140 reaches the limit position, the clockwise rotation of the rotating shaft 110 reaches the limit position, and at this time, the rotating shaft 110 cannot rotate clockwise continuously, but only rotates counterclockwise. This can restrict the rotation of the rotation shaft 110 from being excessively rotated in the clockwise direction. When the rotation shaft 110 rotates counterclockwise, the sliding portion 160 moves toward the second stopper 150, and similarly to the above-described limitation of the clockwise excessive rotation, the sliding portion 160 abuts against the second stopper 150, and then the counterclockwise excessive rotation of the rotation shaft 110 can be also limited.

Specifically, referring to fig. 10 and 11, the first stopper 140 is convexly provided with a first stopper portion 141, and the first stopper portion 141 has a first stop surface 142. The second stopper 150 is convexly provided with a second limiting portion 151, and the second limiting portion 151 is provided with a second stopping surface 152. The first position-limiting portion 141 protrudes from the first position-limiting stopper 140 toward the sliding portion 160, and the second position-limiting portion 151 protrudes from the second position-limiting stopper 150 toward the sliding portion 160.

Referring to fig. 8, a first abutting portion 161 is protruded toward the first stopper 140 at a side of the sliding portion 160 close to the first stopper 140, and the first abutting portion 161 has a first abutting surface 163. A second abutting portion 162 is protruded toward the second stopper 150 at a side of the sliding portion 160 close to the second stopper 150. The second abutment 162 has a second abutment surface 164. The sliding portion 160 moves to bring the first contact portion 161 into contact with the first stopper portion 141 or bring the second contact portion 162 into contact with the second stopper portion 151, thereby bringing the first contact surface 163 into contact with the first stopper surface 142 or bringing the second contact surface 164 into contact with the second stopper surface 152.

The sliding portion 160 is moved toward the first stopper 140 as an example: the rotation of the shaft 110 drives the sliding part 160 to move toward the first stopper 140. During the movement of the sliding portion 160, there is no interference between the first stopper portion 141 and the first contact portion 161. As the sliding portion 160 continues to move, the first stop surface 142 of the first stopper 141 and the first contact surface 163 of the first contact portion 161 contact each other, and the first stop surface and the first contact surface interfere with each other, so that the sliding portion 160 cannot continue to move, and the rotating shaft 110 cannot continue to rotate. The arrangement of the first abutting portion 161 and the first stopper portion 141 enables the sliding portion 160 and the first stopper 140 to be disposed at an interval without directly abutting the sliding portion 160 and the first stopper 140 through the end face, thereby reducing the possibility that the sliding portion 160 moves to the end of the effective length of the thread on the lead screw 130 and reducing the possibility that the thread between the sliding portion 160 and the lead screw 130 is screwed. The sliding portion 160 moves toward the second stopper 150 for the same reason, and is not described in detail.

When the first abutting portion 161 abuts against the first limiting portion 141, the first abutting surface 163 and the first stopping surface 142 are matched to form surface contact, so that the acting force between the first abutting portion 161 and the first limiting portion 141 can be distributed uniformly.

Further, when the rotation of the rotating shaft 110 is limited, the sliding portion 160 and the first stopper 140 are mainly acted by torque, and the direction of the force specifically acting on the sliding portion 160 and the first stopper 140 is parallel to the tangential direction of the limiting shaft segment. By arranging the normal directions of the first stopping surface 142, the second stopping surface 152, the first abutting surface 163, and the second abutting surface 164 in parallel with the tangential direction of the stopper shaft section at that point, the normal directions of the first stopping surface 142 and the first abutting surface 163 can be made parallel with the force receiving directions of the sliding portion 160 and the first stopper 140. Thus, the bearing capacity of the first stopping surface 142 and the first abutting surface 163 can be increased, which is beneficial to increasing the stability of limiting the rotation of the rotating shaft 110. The second abutting surface 164 and the second stopping surface 152 are similar and will not be described again. Optionally, the axis of the rotating shaft 110 is located in the first stopping surface 142 and the first abutting surface 163, that is, the abutting area of the first stopping surface 142 and the first abutting surface 163 when abutting can be maximized, so as to further increase the stability when abutting.

In another embodiment, referring to fig. 7, when the movement of the sliding portion 160 toward the first stopper 140 reaches the limit position, the end surface of the sliding portion 160 toward the first stopper 140 abuts against the end surface of the first stopper 140 toward the sliding portion 160. When the movement of the sliding portion 160 toward the first stopper 140 reaches the limit position, the end surface of the sliding portion 160 toward the second stopper 150 abuts against the end surface of the second stopper 150 toward the sliding portion 160. With this arrangement, the structures of the sliding portion 160, the first stopper 140, and the second stopper 150 can be simplified, and the assembly of the entire structure of the stopper device 100 can be made more compact.

The following is an exemplary description of embodiments of the first stop 140, the second stop 150, and the lead screw 130:

in an embodiment, referring to fig. 10 to 12, the first stopper 140 is integrally disposed with the screw 130, the second stopper 150 is inserted into the screw 130, and the first stopper 140, the second stopper 150 and the screw 130 are sleeved on the periphery of the limiting shaft. This can facilitate assembly of the lead screw 130, the first stopper 140, and the second stopper 150. Optionally, in this embodiment, the second stopper 150 may be integrally disposed with the lead screw 130, and the first stopper 140 is disposed in an inserting manner with the lead screw 130.

In another embodiment, referring to fig. 13, the first stopper 140 is inserted into one end of the screw 130, the second stopper 150 is inserted into the other end of the screw 130, and the first stopper 140, the second stopper 150 and the screw 130 are sleeved on the periphery of the limiting shaft. Specifically, the first stopper 140 is provided with at least one first insertion hole 143, the second stopper 150 is provided with at least one second insertion hole 153, and two ends of the screw 130 are respectively provided with a first insertion portion 132 corresponding to the first insertion hole 143 and a second insertion portion 133 corresponding to the second insertion hole 153. The first insertion portion 132 is inserted into the first insertion hole 143, and the second insertion portion 133 is inserted into the second insertion hole 153, so that the first stopper 140 and the second stopper 150 are connected to the lead screw 130.

Furthermore, one end of the screw 130 is circumferentially provided with two first plugging portions 132 at intervals, the other end of the screw 130 is circumferentially provided with two second plugging portions 133 at intervals, and a connecting line of the two first plugging portions 132 and a connecting line of the two second plugging portions 133 form an included angle. The two first inserting parts 132 and the two second inserting parts 133 can make the torque distribution between the screw 130 and the first stopper 140 and the second stopper 150 more uniform, which is beneficial to improving the stability of the whole structure. Alternatively, a line connecting the two first sockets 132 and a line connecting the two second sockets 133 are arranged vertically. So can make lead screw 130 and first stopper 140 and second stopper 150 when producing the interaction force, the effort that produces can be at the axial interval distribution of lead screw 130 to make the atress of lead screw 130 comparatively even, thereby promote its structural stability.

In another embodiment, referring to fig. 14, the first stopper 140, the second stopper 150 and the lead screw 130 are integrally disposed, and the first stopper 140, the second stopper 150 and the lead screw 130 are sleeved on the outer circumference of the limiting shaft section. The sliding portion 160 includes a first sliding portion 160a and a second sliding portion 160b, which are respectively sleeved on the periphery of the screw 130 and connected to each other.

In the above embodiment, the first stopper 140 and the second stopper 150 are connected to the lead screw 130, so that the first stopper 140 and the second stopper 150 rotate together with the rotation shaft 110. As described above, when the sliding portion 160 abuts against the first stopper 140, the sliding portion 160 cannot move, and the first stopper 140 cannot continue to rotate. The rotation of the rotation shaft 110 is restricted by the sliding portion 160 being engaged with the screw thread of the lead screw 130 on the one hand, and the torque resisting the rotation is transmitted to the lead screw 130 by the first stopper 140 on the other hand, thereby enhancing the effect of restricting the excessive rotation of the rotation shaft 110.

In other embodiments, the first stopper 140 and the second stopper 150 may be mounted on the housing 120 or integrally disposed with the housing 120, and the first stopper 140 and the second stopper 150 are sleeved on the periphery of the limiting shaft section and are in clearance fit with the limiting shaft section. In other words, when the rotating shaft 110 rotates, the first stopper 140 and the second stopper 150 do not rotate along with the rotating shaft 110.

Referring to fig. 8, 15 and 16, in an embodiment, the sliding connection of the sliding portion 160 and the housing 120 may be as follows.

The housing 120 is provided with a slide groove 121, and the sliding portion 160 is provided with a slider 165, the slider 165 being slidably engaged with the slide groove 121. The sliding groove 121 may be disposed through a sidewall of the housing 120, or may be formed by bending a sidewall of the housing 120, which is not limited herein. The limiting device 100 further includes a bushing 166, and the bushing 166 is disposed between the sliding portion 160 and the inner wall of the casing 120 and is sleeved on the periphery of the sliding block 165. The bush 166 can reduce the frictional force between the slider 165 and the chute 121, thereby making the sliding of the sliding portion 160 smoother and also reducing the noise of the sliding portion 160 during sliding.

Further, the housing 120 is provided with at least two sliding grooves 121, and the sliding grooves 121 are disposed through the side wall of the housing 120. The sliding portion 160 is provided with at least two sliders 165 slidably engaged with the slide grooves 121. One of the sliding blocks 165 extends from the end of the outer periphery of the sliding part 160 close to the first stopper 140 to the first direction far away from the axis of the rotating shaft 110, and the other sliding block 165 extends from the end of the outer periphery of the sliding part 160 close to the second stopper 150 to the second direction far away from the first direction. Wherein the first direction and the second direction are parallel but in opposite directions. So set up, can make the setting of slider 165 can separate the space, give way for the installation of returning pearl ware 180 to can be convenient for return the installation of pearl ware 180.

Referring to fig. 16, at least two sliding grooves 121 extend from one end of the housing 120 close to the first stopper 140 to the direction of the first stopper 140 toward the second stopper 150 along the axial direction of the rotating shaft 110, and the extending length of one sliding groove 121 is shorter than that of the other sliding groove 121. With this arrangement, when the slide portion 160 moves toward the second stopper 150, the sliders 165 at different positions can simultaneously abut against the end walls of the slide groove 121. When the sliding block 165 abuts against the end wall of the sliding groove 121, the sliding part 160 abuts against the second stopper 150, so that the end wall of the sliding groove 121 and the second stopper 150 can simultaneously limit the sliding of the sliding part 160. The ends of the two sliding grooves 121 adjacent to the first stopper 140 may be flush with each other, or the sliding part 160 may be able to escape from the ends of the two sliding grooves 121 adjacent to the first stopper 140.

Referring to fig. 4 and 5, the limiting device 100 further includes a fastening element 170, and the fastening element 170 may be a nut or a snap spring, which is not limited in particular. The fastening member 170 is sleeved on the rotating shaft 110 and located at an end of the second stopper 150 far from the first stopper 140 to limit the movement of the first stopper 140, the second stopper 150 and the lead screw 130 relative to the rotating shaft 110. Therefore, axial movement of each part can be reduced, and the stability of limiting rotation of the limiting device 100 is improved.

In summary, the lead screw 130 is disposed on the limit shaft section of the rotating shaft 110, and the sliding portion 160 is disposed on the lead screw 130 in a threaded manner, so that the rotation of the rotating shaft 110 can be transmitted to the sliding portion 160 through the lead screw 130. Since the sliding portion 160 is slidably coupled to the housing 120, the rotation of the rotating shaft 110 can be converted into the movement of the sliding portion 160 through the lead screw 130. Or the ball passage formed by the screw 130 and the sliding part 160 and the ball returning passage of the ball returning device 180 enable the balls to roll in the ball passage and the ball returning passage. The rotating shaft 110 can drive the screw 130 to rotate in the rotating process, and the rotation of the screw 130 can drive the balls to roll, so that the rotation of the rotating shaft 110 can be transmitted to the sliding part 160. Since the sliding portion 160 is slidably coupled to the housing 120, the rotation of the rotation shaft 110 can be converted into the movement of the sliding portion 160.

The rotation of the rotation shaft 110 may be a counterclockwise rotation or a clockwise rotation. When the rotating shaft 110 rotates counterclockwise, the sliding portion 160 moves toward one end of the rotating shaft 110 along the axial direction of the rotating shaft 110. When the rotating shaft 110 rotates clockwise, the sliding portion 160 moves toward the other end of the rotating shaft 110 along the axial direction of the rotating shaft 110. When the sliding portion 160 moves to both ends of the screw 130 along the axial direction of the rotating shaft 110, the first contact portion 161 or the second contact portion 162 of the sliding portion 160 can contact the first stopper portion 141 of the first stopper 140 or the second stopper portion 151 of the second stopper 150 provided at both ends of the screw 130. When the first abutting portion 161 abuts against the first stopper 141, the sliding portion 160 can no longer move further toward the first stopper 140 due to the restriction of the first stopper 140; when the second contact portion 162 contacts the second stopper portion 151, the sliding portion 160 cannot move further toward the second stopper 150 due to the restriction of the second stopper 150. When the sliding portion 160 cannot move any more, the sliding portion 160 is in transmission connection with the screw 130, so that the screw 130 cannot rotate any more, and further the rotating shaft 110 cannot rotate any more. With such an arrangement, the clockwise or counterclockwise rotation angle of the rotating shaft 110 can be limited, so that the rotating shaft 110 can be limited by the first limiter 140 or the second limiter 150 after rotating in one direction by a certain angle, thereby limiting the excessive rotation of the rotating shaft 110.

The above are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A stop device, comprising:

the shell is internally provided with a limiting cavity;

the rotating shaft is provided with a limiting shaft section, and at least part of the limiting shaft section penetrates through the limiting cavity;

the screw rod is arranged on the periphery of the limiting shaft section, and a first ball groove is spirally arranged on the screw rod;

the first limiting stopper is arranged on the limiting shaft section and is positioned at one end of the lead screw;

the second limiting stopper is arranged on the limiting shaft section and is positioned at the other end of the lead screw;

the sliding part is arranged in the limiting cavity and is in sliding connection with the shell, the sliding part is sleeved on the outer periphery of the screw rod, a second ball groove is formed in the inner periphery of the sliding part, and the second ball groove is matched with part of the first ball groove to form a ball channel;

the ball returning device is provided with a ball returning channel, one end of the ball returning channel is communicated with one end of the ball channel, and the other end of the ball returning channel is communicated with the other end of the ball channel so as to circulate balls in the ball channel and the ball returning channel;

the sliding part is abutted to the first stopper or the second stopper through movement so as to limit the rotation of the rotating shaft.

2. The spacing device of claim 1, wherein:

the first limiting device is provided with a first limiting part, the second limiting device is provided with a second limiting part, one side of the sliding part, which is close to the first limiting device, is convexly provided with a first abutting part, and one side of the sliding part, which is close to the second limiting device, is convexly provided with a second abutting part; the sliding portion moves to cause the first abutting portion to abut against the first stopper portion, or to cause the second abutting portion to abut against the second stopper portion.

3. The spacing device of claim 2, characterized in that:

the first limiting device is convexly arranged on the first limiting part, and the first limiting part is provided with a first stop surface; the second limiting part is convexly arranged on the second limiting device and provided with a second stop surface; the first abutting part is provided with a first abutting surface, and the second abutting part is provided with a second abutting surface; the sliding portion moves to bring the first abutting surface into abutment with the first stopper surface or bring the second abutting surface into abutment with the second stopper surface.

4. A spacing device according to claim 3, characterized in that:

the normal directions of the first stopping surface, the second stopping surface, the first abutting surface and the second abutting surface are parallel to the tangential direction of the limiting shaft section.

5. The spacing device of claim 1, characterized in that:

the first limiting device and the lead screw are integrally arranged, the second limiting device and the lead screw are arranged in an inserting mode, and the first limiting device, the second limiting device and the lead screw are sleeved on the periphery of the limiting shaft section.

6. The spacing device of claim 1, characterized in that:

the first limiting device is connected with one end of the lead screw in an inserting mode, the second limiting device is connected with the other end of the lead screw in an inserting mode, and the first limiting device, the second limiting device and the lead screw are sleeved on the periphery of the limiting shaft section.

7. The spacing device of claim 6, wherein:

the first limiting device is provided with at least one first inserting hole, the second limiting device is provided with at least one second inserting hole, and two ends of the lead screw are respectively provided with a first inserting part corresponding to the first inserting hole and a second inserting part corresponding to the second inserting hole; the first inserting portion is inserted into the first inserting hole, and the second inserting portion is inserted into the second inserting hole.

8. The spacing device of claim 7, characterized in that:

the screw rod is characterized in that two first inserting parts are arranged at one end of the screw rod at intervals in the circumferential direction, two second inserting parts are arranged at the other end of the screw rod at intervals in the circumferential direction, and a connecting line of the two first inserting parts and a connecting line of the two second inserting parts form an included angle.

9. The spacing device of claim 1, wherein:

the shell is provided with at least two sliding grooves, and the sliding part is provided with at least two sliding blocks in sliding fit with the sliding grooves; one sliding block extends to a first direction far away from the axis of the rotating shaft from one end, close to the first limiting stopper, of the periphery of the sliding part, and the other sliding block extends to a second direction far away from the first direction from one end, close to the second limiting stopper, of the periphery of the sliding part; at least two sliding grooves extend from one end of the shell, close to the first limiting stopper, to the direction of the first limiting stopper towards the second limiting stopper along the axis direction of the rotating shaft, and the extending length of one sliding groove is shorter than that of the other sliding groove.

10. The spacing device of claim 1, wherein:

the screw rod and the limiting shaft section are integrally arranged, or the screw rod is in key connection with the limiting shaft section, the limiting device further comprises a fastener, the fastener is sleeved on the rotating shaft and is positioned at one end, far away from the first limiter, of the second limiter so as to limit the first limiter, the second limiter and the screw rod to move relative to the rotating shaft.

11. A steer-by-wire system, comprising:

a spacing device as claimed in any one of claims 1 to 10;

a steering wheel;

the steering column, the steering wheel is connected steering column and coaxial setting, stop device the pivot is connected steering column and coaxial setting.

12. The steer-by-wire system of claim 11, wherein:

the steer-by-wire system also comprises a road sensing motor and a speed reducer, wherein the road sensing motor is in transmission connection with the speed reducer, and the speed reducer is in transmission connection with the steering column or the rotating shaft; the speed reducer is provided with a shell, and a shell of the limiting device is detachably connected with the shell or integrally arranged with the shell.

13. A vehicle, characterized by comprising:

the steer-by-wire system of claim 12, the steer-by-wire system being disposed on the frame and in driving connection with the wheel.