Steering-by-wire system and vehicle

Abstract

The utility model relates to the technical field of vehicle steering, in particular to a steer-by-wire system and a vehicle, and aims to solve the problems that an existing steer-by-wire system cannot realize mechanical self-locking and cannot lock steering of wheels. In order to achieve the purpose, the steer-by-wire system comprises a transmission part, and the transmission part moves in the length direction of the transmission part and can drive wheels to steer; the steer-by-wire system further comprises a locking mechanism, the locking mechanism comprises a driving mechanism and a first limiting part arranged at the output end of the driving mechanism, a plurality of second limiting parts are arranged on the transmission piece at intervals, and the driving mechanism can drive the first limiting part to be matched with the second limiting parts so as to lock the transmission piece. When steering of the wheel needs to be locked, the transmission piece is locked through the locking mechanism, and then the wheel is locked and cannot be steered.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle steering, and specifically provides a wire-controlled steering system and a vehicle. Background Art

[0002] With the development of technology, in order to save space in the vehicle and make the overall structure of the vehicle simpler, many vehicles now begin to use wire-controlled steering systems, that is, the steering wheel and the steering gear are connected through electronic communication rather than mechanical structure.

[0003] During the driving and parking process of the vehicle, the wheels need to be locked so that the vehicle cannot turn. However, the current wire control steering system does not have a mechanical locking function, so when the wheels need to be locked, the steering of the wheels cannot be locked.

[0004] Therefore, the relevant field is in urgent need of a wire-controlled steering system and a vehicle to solve the above-mentioned technical problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem that the existing wire-controlled steering system cannot mechanically self-lock and cannot lock the wheel steering.

[0006] In a first aspect, the utility model provides a steer-by-wire system, comprising a transmission member, wherein the transmission member can drive the wheels to steer when moved along its length direction; the steer-by-wire system also comprises a locking mechanism, which comprises a driving mechanism and a first limiting portion arranged at an output end of the driving mechanism, a plurality of second limiting portions are arranged at intervals on the transmission member, and the driving mechanism can drive the first limiting portion to cooperate with the second limiting portion to lock the transmission member.

[0007] In a specific embodiment of the above-mentioned steer-by-wire system, one of the first limiting portion and the second limiting portion is a limiting groove, and the other is a limiting protrusion matched with the limiting groove.

[0008] In a specific embodiment of the above-mentioned steer-by-wire system, the end of the limiting protrusion away from the driving mechanism or the transmission member is wedge-shaped; and / or

[0009] The shape of the limiting groove is also wedge-shaped.

[0010] In a specific embodiment of the above-mentioned steer-by-wire system, the transmission member is a rack, and the second limiting portion is arranged on the back side of the rack.

[0011] In a specific embodiment of the above-mentioned steer-by-wire system, the first limiting portion is a limiting protrusion, and the second limiting portion is a limiting groove.

[0012] In a specific implementation of the above-mentioned steer-by-wire system, the number of the limiting grooves is ten.

[0013] In a specific embodiment of the above-mentioned steer-by-wire system, the first limiting portion is a first limiting tooth, and the second limiting portion is a second limiting tooth matched with the first limiting tooth.

[0014] In a specific embodiment of the above-mentioned wire-controlled steering system, it also includes a shell, the transmission member is slidably arranged in the shell, and the driving mechanism is fixed on the shell.

[0015] In a specific implementation of the above-mentioned steer-by-wire system, the number of the limit grooves = maximum steering angle of the steering wheel ÷ locking angle.

[0016] In a second aspect, the utility model provides a vehicle, the vehicle comprising:

[0017] Vehicle body;

[0018] As described above, the steer-by-wire system is arranged on the vehicle body.

[0019] In the case of adopting the above technical solution, the wire control steering system of the utility model includes a transmission member, and the transmission member can drive the wheel to turn by moving along its length direction; the wire control steering system also includes a locking mechanism, which includes a driving mechanism and a first limit portion arranged at the output end of the driving mechanism, and a plurality of second limit portions are arranged on the transmission member at intervals, and the driving mechanism can drive the first limit portion to cooperate with the second limit portion to lock the transmission member. When it is necessary to lock the wheel steering, the transmission member can be locked by the locking mechanism, and then the wheel is locked to prevent it from turning.

[0020] Specifically, when the wire-controlled steering system fails or the electronic control fails, the locking mechanism can be used to lock the transmission parts and then lock the wheels, so that the front wheels will not swing, ensuring the control of the entire vehicle and enabling the vehicle to be parked safely.

[0021] In addition, one of the first limiting part and the second limiting part is a limiting groove, and the other is a limiting groove; the matching limiting protrusion and limiting groove are both wedge-shaped, so that when the limiting protrusion and the limiting groove are not completely aligned, the limiting protrusion can be inserted into the limiting groove, and the self-adaptability is better to complete the locking of the transmission member. Moreover, the limiting protrusion and the limiting groove fit each other, which can increase the force-bearing area of ​​the limiting protrusion, so that the limiting protrusion is not easily damaged and its service life is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0023] Figure 1It is a structural schematic diagram of the wire-controlled steering system provided by the utility model;

[0024] Figure 2 This is a partial cross-sectional view of the wire control steering system provided by the utility model. Figure 1 ;

[0025] Figure 3 This is a partial cross-sectional view of the wire control steering system provided by the utility model. Figure 2 .

[0026] List of reference numerals:

[0027] 1. Transmission member; 11. Second limiting part; 2. Driving mechanism; 21. First limiting part; 31. Bearing; 5. Steering motor; 6. Housing. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0029] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to solve the problem that the existing wire-controlled steering system cannot mechanically self-lock and cannot lock the wheel steering, this embodiment discloses a vehicle, which includes a vehicle body and a wire-controlled steering system arranged on the vehicle body. Figure 1-3 As shown, the wire-controlled steering system includes a transmission mechanism, a locking mechanism, a housing assembly and a steering drive assembly.

[0032] The transmission mechanism includes a transmission member 1, which can drive the wheel to turn when the transmission member 1 moves along its length direction; specifically, a steering rod is connected to the end of the transmission member 1, and the steering rod is connected to the wheel through a steering knuckle. When the transmission member 1 moves along its length direction, the wheel can be deflected through the steering rod and the steering knuckle to achieve vehicle steering control.

[0033] The housing assembly further includes a shell 6, and the transmission member 1 is slidably disposed in the shell 6. Specifically, a slide groove may be disposed in the shell 6, and the transmission member 1 is slidably disposed in the slide groove.

[0034] The steering drive assembly specifically includes a steering motor 5, which is connected to the transmission member 1 in a transmission manner, and is used to drive the transmission member 1 to move, and then drive the connecting rod to move, so as to drive the wheel to deflect for steering. Specifically, the transmission member 1 is specifically a rack, the steering motor 5 is fixed on the housing 6 (specifically, the housing of the steering motor 5 is integrated on the housing 6), and the axis of the steering motor 5 is arranged parallel to the transmission member 1, and the output end of the steering motor 5 is provided with a gear, which is specifically a shaft gear, which meshes with the rack. When the steering motor 5 drives the gear to rotate forward, the rack can be moved in a first direction, and when the steering motor 5 drives the gear to rotate in the reverse direction, the rack can be moved in a second direction, wherein the first direction and the second direction are opposite. The wheel can be swung to the left and to the right by rotating the steering motor 5 in different directions, so as to realize the free steering of the vehicle. During normal parking, after the steering motor 5 is turned off, the drive mechanism 2 drives the second limit portion 11 to cooperate with the first limit portion 21 of the transmission member, which can lock the rack and prevent it from moving; thereby locking the steering of the wheel to prevent the wheel from shaking after parking.

[0035] The steering motor 5 is connected to the vehicle's steering wheel steering system in communication. The steering wheel steering system includes a steering wheel and an angle detection member. The angle detection member is used to detect the rotation angle and direction of the steering wheel, thereby controlling the wire control steering system to control the steering of the vehicle. Moreover, the steering motor 5 is specifically connected to the steering wheel steering system through line communication. Because wired transmission signals are more stable than wireless transmission signals, and the failure rate is also very low, the signal transmission quality and stability can be effectively guaranteed, thereby effectively ensuring the driving safety of the vehicle.

[0036] like Figure 2 and 3As shown, the locking mechanism includes a driving mechanism 2 and a first limiting portion 21 arranged at the output end of the driving mechanism 2, and a plurality of second limiting portions 11 are arranged at intervals on the transmission member 1. The driving mechanism 2 can drive the first limiting portion 21 to cooperate with the second limiting portion 11 to lock the transmission member 1 so that the wheel cannot be turned; specifically, when a fault occurs in the wire control steering system or the electronic control fails, the driving mechanism 2 can drive the first limiting portion 21 to cooperate with the second limiting portion 11 to lock the transmission member 1, and then lock the wheel, so that the front wheel will not swing, thereby ensuring the control of the entire vehicle and enabling the vehicle to be parked safely.

[0037] The drive mechanism 2 is a linear drive mechanism 2, which can be an electric push rod, or an electric cylinder or a pneumatic cylinder, etc. The housing of the drive mechanism 2 is fixed to the outer shell 6, and can be fixedly connected by bolts.

[0038] The first limiting portion 21 and the second limiting portion 11, one of which is a limiting groove, and the other is a limiting protrusion that matches the limiting groove. The first limiting portion 21 is a limiting protrusion, and the second limiting portion 11 is a limiting groove; this arrangement allows the rack to slide smoothly in the housing 6 without increasing the size of the rack, which can better save space; and can also minimize changes to the original wire control steering system.

[0039] The front end of the limiting protrusion is wedge-shaped, so that when the limiting protrusion and the limiting groove are not completely aligned, the limiting protrusion can also be extended into the limiting groove to limit the transmission member 1. The shape of the limiting groove is also wedge-shaped, which is matched with the limiting protrusion. After the limiting protrusion is inserted into the limiting groove, the contact surface between the limiting protrusion and the limiting groove can be ensured to be larger, thereby ensuring a larger force-bearing area and ensuring that the limiting protrusion is not easily damaged.

[0040] Regarding the shapes of the limiting groove and the limiting protrusion, it should be noted that although the limiting protrusion and the limiting groove are both wedge-shaped in the present embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art may choose that the limiting protrusion and the limiting block are both conical, frustum-shaped, or wedge-shaped. This arrangement can also enable the limiting protrusion to be inserted into the limiting groove when the limiting protrusion and the limiting groove are not completely aligned, so as to lock the transmission member 1. Moreover, the limiting protrusion and the limiting groove fit together, increasing the force-bearing area and making the limiting protrusion less likely to be damaged. All of this does not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0041] The limit groove can be specifically set on the back of the rack to avoid interference with the teeth on the rack. Of course, it can also be set on the tooth surface, but the width of the limit groove must be smaller than the length of the teeth on the tooth surface to ensure that the steering drive assembly can still drive the rack to move. However, in order to ensure the stability of power transmission, it is preferred to set the limit grooves at intervals on the back of the rack.

[0042] Regarding the position of the limit groove, it should be noted that, although it is set on the back of the rack in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, the limit groove can be set on both sides of the rack, and at the same time, the locking mechanism is also set on the side of the rack to cooperate with the limit groove to limit the rack. This does not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0043] The number of limit slots is 10. Specifically, the number and spacing of the specific limit slots can be defined based on the maximum steering wheel angle (number of turns * 360°), the maximum steering stroke and the linear angle transmission ratio (the distance the rack moves when the steering wheel turns one circle). The number of limit slots can be defined by dividing the maximum steering wheel angle by the required locking angle (how many degrees the steering wheel needs to be locked once); that is, the number of limit slots = maximum steering wheel angle ÷ locking angle. The number of slot spacings is equal to the number of tooth slots minus one; and the size of the slot spacing can be determined by the total rack stroke (the product of the number of steering wheel turns and the linear angle transmission ratio) minus the total slot width (matching the lock tongue slot width * the number of tooth slots), and then divided by the number of slot spacings. In this embodiment, the steering wheel turns one circle to the left and one circle to the right (720°), the line angle transmission ratio is 70mm / rev, the groove width of the matching lock tongue is 5mm, and the locking angle is required to be 72°. Then: the number of limit grooves is equal to the maximum steering wheel angle (720°) divided by the locking angle (72°), which can be concluded that 10 limit grooves are required; then the number of groove spacings needs to be 9. The size of the groove spacing is equal to the total rack stroke (140mm) minus the total width of 10 grooves (10*5), divided by the number of groove spacings (9), which is equal to 10mm. The depth of the groove matches the lock tongue. In the case of wire control steering LOA, a limit groove will appear every time the steering wheel rotates 72°, effectively preventing the wheel from swinging at will when EPS fails.

[0044] Although it should be noted that the number of the limit slots in this embodiment is 10, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art may also choose 12 or 16, etc., and the corresponding steering wheel is locked every 60° or 45° rotation, and the slot spacing of the limit slots is determined according to the number and the width of the limit slots. This does not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0045] It should be noted that, although the first limiting portion 21 is a limiting protrusion and the second limiting portion 11 is a limiting groove in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art may select the first limiting portion 21 to be a first limiting tooth and the second limiting portion 11 to be a second limiting tooth that matches the first limiting tooth. The second limiting tooth may be arranged continuously, and may be a transmission tooth that is connected to the steering drive assembly. The continuous arrangement of the second limiting tooth can lock the wheel when the steering wheel is rotated at any angle (specifically, the rotation angle corresponding to a single tooth of the rack). This arrangement can effectively prevent the wheel from swinging at will when the EPS fails. It should be noted that, although the second limiting tooth is arranged on the tooth surface in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, the second limiting tooth may also be arranged on the back or side of the rack, which does not deviate from the basic principle of the present invention and falls within the protection scope of the present invention. It should be noted that the second position-limiting teeth are arranged in a continuous manner in this embodiment, but this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art may also choose to arrange the second position-limiting teeth on the non-tooth surface of the rack, and the second position-limiting teeth may be arranged continuously or at intervals. However, when arranged at intervals, at least one of the first position-limiting teeth and the second position-limiting teeth shall have no less than two teeth. This does not deviate from the basic principle of the present invention and shall fall within the scope of protection of the present invention.

[0046] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A steer-by-wire system, comprising a transmission member, wherein the transmission member can drive the wheels to steer when it moves along its length direction; characterized in that: It also includes a locking mechanism, which includes a driving mechanism and a first limiting portion arranged at the output end of the driving mechanism. A plurality of second limiting portions are spaced apart on the transmission member. The driving mechanism can drive the first limiting portion to cooperate with the second limiting portion to lock the transmission member.

2. The steer-by-wire system according to claim 1, characterized in that: One of the first limiting portion and the second limiting portion is a limiting groove, and the other is a limiting protrusion matched with the limiting groove.

3. The steer-by-wire system according to claim 2, characterized in that: The end of the limiting protrusion away from the driving mechanism or the transmission member is wedge-shaped; and / or The shape of the limiting groove is also wedge-shaped.

4. The steer-by-wire system according to claim 3, characterized in that: The transmission member is a rack, and the second limiting portion is arranged on the back side of the rack.

5. The steer-by-wire system according to claim 2, characterized in that: The first limiting portion is a limiting protrusion, and the second limiting portion is a limiting groove.

6. The steer-by-wire system according to claim 5, characterized in that: The number of the limiting grooves is 10.

7. The steer-by-wire system according to claim 1, characterized in that: The first limiting portion is a first limiting tooth, and the second limiting portion is a second limiting tooth matched with the first limiting tooth.

8. The steer-by-wire system according to claim 2, characterized in that: It also includes a shell, the transmission member is slidably arranged in the shell, and the driving mechanism is fixed on the shell.

9. The steer-by-wire system according to claim 8, characterized in that: The number of the limiting grooves = the maximum steering angle of the steering wheel ÷ the locking angle.

10. A vehicle, characterized in that: It includes: Vehicle body; The steer-by-wire system according to any one of claims 1 to 9, wherein the steer-by-wire system is arranged on the vehicle body.

Images