An electric power steering system and automobile thereof

Abstract

The application relates to an electric power steering system and a car thereof, which comprises a frame, a steering structure, a steering engine structure and a steering straight pull rod, the steering structure comprises a steering knuckle body, the steering engine structure is arranged on the frame, one end of the steering engine structure is used for being connected with a transmission shaft of a steering wheel, and the other end is provided with an output interface; one end of an input interface of the steering straight pull rod is connected with the output interface, the other end is connected with the steering knuckle body, and the linear distance between the input interface of the steering straight pull rod and a front support lug of a leaf spring of a suspension system is less than a first set value; the steering engine structure is configured in such a manner that when the transmission shaft of the steering wheel drives one end of the steering engine structure to move, the output interface drives the steering straight pull rod to linearly displace, so as to drive the steering knuckle body to rotate. The linear distance between the input interface of the steering straight pull rod and the front support lug of the leaf spring of the suspension system is less than the first set value, the difference between the movement track of the input interface of the steering straight pull rod and the front support lug of the leaf spring is reduced, and the movement interference amount of the electric power steering system and the suspension system is reduced.

Description

Technical Field

[0001] This application relates to the field of automotive steering technology, and in particular to an electric steering system and an automobile thereof. Background Technology

[0002] Currently, heavy-duty trucks and other vehicles with large front axle loads mostly use electro-hydraulic steering systems as the actuators of the steering system. Its basic structure is to integrate a steering motor at the input shaft of a traditional hydraulic recirculating ball steering gear, and the output shaft of the steering motor and the input shaft of the recirculating ball steering gear are connected by a worm gear pair.

[0003] In an electro-hydraulic steering system, the steering motor executes a steer-by-wire command to rotate a certain angle, which in turn drives the input shaft of the recirculating ball steering gear to rotate by the corresponding angle via a worm gear pair. This, in turn, drives the steering arm to achieve a certain turning angle and realize the steering function. However, the electro-hydraulic steering system requires supporting components such as a hydraulic pump, hydraulic oil tank, and pipelines.

[0004] Currently, a small number of buses use electric steering systems, which suffer from excessively long steering gears. The distance from the steering column to the upper steering arm needs to be large to accommodate them, resulting in a longer front overhang. At the same time, the ball joint at the output end of the steering gear is too close to the upper steering arm. Since the front overhang of commercial vehicles is shorter than that of buses, when leaf spring suspension is matched on commercial vehicles, the horizontal distance between this point and the front lug of the leaf spring is too large. When the suspension bounces, it will cause serious motion interference between the steering system and the suspension system, resulting in tire wear or vehicle shimmy. Summary of the Invention

[0005] This application provides an electric steering system and a vehicle thereof, which can solve the problem of motion interference between the steering system and the suspension system in the related art, causing tire wear or vehicle shimmy.

[0006] In a first aspect, embodiments of this application provide an electric steering system, comprising: a frame, a steering structure, a steering gear structure, and a steering tie rod. The steering structure includes a steering knuckle body. The steering gear structure is mounted on the frame, with one end connected to the drive shaft of a steering wheel and the other end having an output interface. One end of the input interface of the steering tie rod is connected to the output interface, and the other end is connected to the steering knuckle body. The linear distance between the input interface of the steering tie rod and the front leaf spring lug of the suspension system is less than a first set value. The steering gear structure is configured such that when the drive shaft of the steering wheel drives one end of the steering gear structure to move, the output interface drives the steering tie rod to linear displacement, thereby driving the steering knuckle body to rotate. With this structure, when the steering wheel is turned, the steering gear structure is driven to move, and the linear displacement of the steering tie rod drives the steering knuckle body to rotate, thus realizing the steering action of the steering knuckle body. The linear distance between the steering tie rod input interface and the front leaf spring support of the suspension system is less than a first set value, so as to reduce the difference between the movement trajectory of the steering tie rod input interface and the front leaf spring support of the suspension system, increase the overlap of their movement trajectories, and thus reduce the amount of motion interference between the electric steering system and the suspension system.

[0007] In conjunction with the first aspect, in one embodiment, both ends of the steering gear structure are fixedly connected to the vehicle frame, and the fixing points between the steering gear structure and the vehicle frame are located at both ends of the steering gear structure. This structural arrangement allows the steering gear structure and the vehicle frame to form a simply supported beam, resulting in better stress distribution between the steering gear structure and the vehicle frame.

[0008] In conjunction with the first aspect, in one embodiment, the output interface is located between the two fixed points.

[0009] In conjunction with the first aspect, in one embodiment, the steering gear structure includes: a servo motor, an angle transmission, and a ball screw, wherein the angle transmission is disposed between the drive shaft of the steering wheel and the servo motor; the ball screw is connected to the servo motor, and an output interface is movably connected to the ball screw.

[0010] In conjunction with the first aspect, in one embodiment, the output interface is initially located at the middle of the ball screw. This structural design significantly reduces the overall length of the steering gear structure for the same stroke compared to existing steering systems, resulting in a more compact structure suitable for installation on commercial vehicles with shorter front overhangs.

[0011] In conjunction with the first aspect, in one embodiment, the output interface is a nut, which is sleeved on the surface of the ball screw and threadedly connected to the ball screw.

[0012] In conjunction with the first aspect, in one embodiment, the nut is provided with a mounting cone hole, and one end of the steering tie rod is placed in the mounting cone hole.

[0013] In conjunction with the first aspect, in one embodiment, the vertical distance between the output interface and the steering structure is less than a second set value. This structure provides greater adaptability to the low entry requirements of the cab.

[0014] In conjunction with the first aspect, in one embodiment, the steering structure further includes: a steering axle and a steering knuckle arm, wherein the steering knuckle body is hinged to the steering axle; one end of the steering knuckle arm is connected to the steering knuckle body, and the other end is connected to the steering tie rod.

[0015] Secondly, embodiments of this application provide a vehicle comprising:

[0016] As described above, in the electric steering system and suspension system, the suspension system is located on one side of the electric steering system, and the straight-line distance between the input interface of the steering tie rod of the electric steering system and the front leaf spring lug of the suspension system is less than a first set value.

[0017] The beneficial effects of the technical solutions provided in this application include:

[0018] This application provides an electric steering system and its vehicle. When the steering wheel is turned, the steering gear structure is driven to move, and the linear displacement of the steering tie rod drives the steering knuckle body to rotate, thereby realizing the steering action of the steering knuckle body. The linear distance between the steering tie rod input interface and the front leaf spring support of the suspension system is less than a first set value, so as to reduce the difference between the movement trajectory of the steering tie rod input interface and the front leaf spring support of the suspension system, increase the overlap of their movement trajectories, and thus reduce the amount of motion interference between the electric steering system and the suspension system. Attached Figure Description

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

[0020] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application.

[0021] In the diagram: 1. Steering gear structure; 10. Servo motor; 11. Ball screw; 12. Nut; 2. Steering tie rod; 3. Steering knuckle arm; 4. Steering axle; 5. Frame; 6. Angle drive; 7. Steering knuckle body; 8. Tie rod. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0023] See Figure 1 This application provides an electric steering system and a vehicle thereof, which can solve the problem of motion interference between the steering system and the suspension system in related technologies, causing tire wear or vehicle shimmy.

[0024] Currently, heavy-duty trucks and other vehicles with large front axle loads mostly use electro-hydraulic steering systems as the actuators of the steering system. Its basic structure is to integrate a steering motor at the input shaft of a traditional hydraulic recirculating ball steering gear, and the output shaft of the steering motor and the input shaft of the recirculating ball steering gear are connected by a worm gear pair.

[0025] In an electro-hydraulic steering system, the steering motor executes a steer-by-wire command to rotate a certain angle, which in turn drives the input shaft of the recirculating ball steering gear to rotate by the corresponding angle via a worm gear pair. This, in turn, drives the steering arm to achieve a certain turning angle and realize the steering function. However, the electro-hydraulic steering system requires supporting components such as a hydraulic pump, hydraulic oil tank, and pipelines.

[0026] Currently, a small number of buses use electric steering systems, which suffer from excessively long steering gears. The distance from the steering column to the upper steering arm needs to be large to accommodate them, resulting in a longer front overhang. At the same time, the ball joint at the output end of the steering gear is too close to the upper steering arm. Since the front overhang of commercial vehicles is shorter than that of buses, when leaf spring suspension is matched on commercial vehicles, the horizontal distance between this point and the front lug of the leaf spring is too large. When the suspension bounces, it will cause serious motion interference between the steering system and the suspension system, resulting in tire wear or vehicle shimmy.

[0027] To address the issue of motion interference between the steering system and the suspension system, which can cause tire wear or vehicle shimmy, this application provides an electric steering system comprising: a frame 5, a steering structure, a steering gear structure 1, and a steering tie rod 2. The steering structure includes a steering knuckle body 7. The steering gear structure 1 is mounted on the frame 5, with one end connected to the drive shaft of the steering wheel and the other end having an output interface. One end of the input interface of the steering tie rod 2 is connected to the output interface, and the other end is connected to the steering knuckle body 7. The linear distance between the input interface of the steering tie rod 2 and the front leaf spring lug of the suspension system is less than a first set value. The steering gear structure 1 is configured such that when the drive shaft of the steering wheel drives one end of the steering gear structure 1 to move, the output interface drives the steering tie rod 2 to linearly displace, thereby driving the steering knuckle body 7 to rotate.

[0028] In this application, when the steering wheel is turned, the steering gear structure 1 is driven to move, and the linear displacement of the steering tie rod 2 drives the steering knuckle body 7 to rotate, thereby realizing the steering action of the steering knuckle body 7. The linear distance between the input interface of the steering tie rod 2 and the front leaf spring support of the suspension system is less than a first set value, so as to reduce the difference between the motion trajectory of the input interface of the steering tie rod 2 and the front leaf spring support of the suspension system, increase the overlap of their motion trajectories, and thus reduce the amount of motion interference between the electric steering system and the suspension system. At the same time, this application realizes the pure electrification of the steering system. The output force of the electric steering gear structure 1 can fully meet the output force required by heavy commercial vehicles and can be applied to the steering system of heavy commercial vehicles.

[0029] This application uses a purely electric steering gear structure 1 as the actuator. The steering gear structure 1 includes a servo motor 10, an angle transmission 6, and a ball screw 11. The angle transmission 6 is positioned between the drive shaft of the steering wheel and the servo motor 10, and the ball screw 11 is connected to the servo motor 10. An output interface is movably connected to the ball screw 11.

[0030] Specifically, the angle transmission 6 is a mechanism for rotational transmission, capable of transmitting power from a starter or electric motor to other mechanical components to achieve mechanical operation. In this embodiment, one end of the angle transmission 6 is connected to the steering wheel, and the other end is connected to the servo motor 10. Therefore, the angle transmission 6 transmits the power from the steering wheel to the servo motor 10, enabling the servo motor 10 to operate, thereby controlling the steering knuckle body 7 to turn.

[0031] It should be noted that the servo motor 10 is horizontally fixed on the outside of the frame 5, and its upper end is connected to the drive shaft of the steering wheel via the angle transmission 6. The other end is connected to the ball screw 11, which is also horizontally positioned on the outside of the frame 5. In this embodiment, the output interface is set as a nut 12, which is sleeved on the surface of the ball screw 11 and threadedly connected to it. Furthermore, a mounting cone hole is provided on the nut 12, and one end of the steering tie rod 2 is placed in the mounting cone hole.

[0032] Therefore, the combination of the servo motor 10 and the ball screw 11 with the nut 12 enables the rotational motion of the ball screw 11 to be converted into the linear motion of the nut 12; that is, when the servo motor 10 drives the ball screw 11 to rotate, the nut 12 can move along the ball screw 11.

[0033] Furthermore, one end of the nut 12 is hinged to a steering tie rod 2. In this embodiment, the steering tie rod 2 is arranged along the length of the frame 5. It should be noted that the steering structure is located at the bottom of the frame 5, and the steering structure is connected to the steering gear structure 1 through the steering tie rod 2. Therefore, although the steering tie rod 2 is arranged along the length of the frame 5, it is not set to be parallel to the frame 5. When the nut 12 moves along the ball screw 11, it drives the steering tie rod 2 to move, thereby pushing the steering knuckle body 7 in the steering structure to rotate.

[0034] Based on the above embodiments, in this embodiment, both ends of the steering gear structure 1 are fixedly connected to the vehicle frame 5, and the fixing points between the steering gear structure 1 and the vehicle frame 5 are located at both ends of the steering gear structure 1.

[0035] Specifically, in this embodiment, one end of the servo motor 10 is fixedly connected to the frame 5, and one end of the ball screw 11 is fixedly connected to the frame 5. The fixing point between the servo motor 10 and the frame 5 is located on one side of the servo motor 10, and the fixing point between the ball screw 11 and the frame 5 is located on one side of the ball screw 11, so that the servo motor 10 and the ball screw 11 are located between the two fixing points, so that the steering gear structure 1 and the frame 5 form a simply supported beam, and the force distribution effect of the steering gear structure 1 and the frame 5 is better.

[0036] Based on the above embodiments, in this embodiment, the output interface is located between two fixed points.

[0037] Specifically, the output interface, i.e., nut 12, is positioned between two fixed points, and the initial position of nut 12 is located in the middle of ball screw 11. This structural design makes the total length of the steering gear structure 1, with the same stroke, much shorter than the total length of existing steering gear designs, resulting in a compact structure that can be installed on commercial vehicles with short front overhangs.

[0038] In addition, to reduce the vertical movement of the steering gear structure 1 along with the vehicle frame 5 caused by the suspension system's bouncing during driving, which would lead to the steering knuckle body 7 in the steering structure deflecting due to the steering tie rod 2, i.e., to reduce the interference between the electric steering system and the suspension system, the input interface of the steering tie rod 2 is positioned near the front leaf spring lug of the suspension system. In this embodiment, the straight-line distance between the input interface of the steering tie rod 2 and the front leaf spring lug of the suspension system is set to be less than a first set value, satisfying the requirement that the nut 12 is positioned near the front leaf spring lug of the suspension system. This reduces the difference in the movement trajectory between the input interface of the steering tie rod 2 and the front leaf spring lug of the suspension system, increases the overlap of their movement trajectories, and thus reduces the amount of movement interference between the electric steering system and the suspension system.

[0039] Based on the above embodiments, in this embodiment, the steering structure includes: a steering axle 4, a steering knuckle body 7, and a steering knuckle arm 3. The steering knuckle body 7 is hinged to the steering axle 4; one end of the steering knuckle arm 3 is connected to the steering knuckle body 7, and the other end is connected to the steering tie rod 2.

[0040] Specifically, the steering axle 4 is located at the bottom of the frame 5. Both ends of the steering axle 4 are hinged to steering knuckle bodies 7, and a tie rod 8 is hinged between the two steering knuckle bodies 7. The steering tie rod 2 is hinged to one of the steering knuckle bodies 7. Therefore, when the nut 12 moves along the ball screw 11, it drives the steering tie rod 2 to move. The steering tie rod 2 pushes the steering knuckle body 7 connected to it to rotate relative to the steering axle 4. When the steering knuckle body 7 rotates, it can drive the other steering knuckle body 7 to rotate relative to the steering axle 4 through the tie rod 8.

[0041] Based on the above embodiments, in this embodiment, the vertical distance between the output interface and the steering structure is less than the second set value. Setting the vertical distance between the output interface, i.e., the nut 12, and the steering knuckle arm 3, in this embodiment to be less than the second set value provides greater adaptability to low cab entry requirements. It should be noted that the second set value is set according to requirements.

[0042] In summary, replacing the original electro-hydraulic steering gear with a pure electric steering gear structure 1 eliminates the need for a steering pump, steering fluid reservoir, and steering lines, significantly reducing the number of parts, allowing for a more compact layout, and improving reliability. The pure electric steering gear structure 1 is more efficient and energy-saving than the electro-hydraulic steering gear, greatly contributing to the vehicle's fuel economy. Furthermore, the pure electric steering gear structure 1 is lighter than the electro-hydraulic steering gear body plus the combined weight of the steering pump, steering fluid reservoir, and hydraulic components, significantly contributing to the vehicle's lightweight design.

[0043] Secondly, this application provides an automobile, which includes: an electric steering system and a suspension system provided in any of the above embodiments of this application, wherein the suspension system is located on one side of the electric steering system, and the straight-line distance between the input interface of the steering tie rod 2 and the front leaf spring lug of the suspension system is less than a first set value.

[0044] This application uses a pure electric steering gear structure 1 as the actuator. The steering gear structure 1 includes a servo motor 10, an angle transmission 6, and a ball screw 11. The angle transmission 6 is located between the drive shaft of the steering wheel and the servo motor 10. The ball screw 11 is connected to the servo motor 10, and an output interface is movably connected to the ball screw 11.

[0045] Specifically, the angle transmission 6 is a mechanism for rotational transmission, which can transmit the power of the starter or motor to other mechanical parts to realize the operation of the machine. In this embodiment, one end of the angle transmission 6 is connected to the steering wheel and the other end is connected to the servo motor 10. The angle transmission 6 transmits the power of the steering wheel to the servo motor 10 to realize the operation of the servo motor 10, thereby controlling the steering knuckle body 7 to turn.

[0046] The servo motor 10 is horizontally fixed to the outside of the frame 5. Its upper end is connected to the drive shaft of the steering wheel via an angle transmission 6, and its other end is connected to a ball screw 11, which is also horizontally positioned on the outside of the frame 5. In this embodiment, the output interface is a nut 12, which is fitted onto the surface of the ball screw 11 and threadedly connected to it. Furthermore, a mounting cone hole is provided on the nut 12, and one end of the steering tie rod 2 is placed inside the mounting cone hole.

[0047] Therefore, the servo motor 10 and the ball screw 11, in conjunction with the nut 12, can convert rotational motion into linear motion of the nut 12; that is, when the servo motor 10 drives the ball screw 11 to rotate, the nut 12 can move along the ball screw 11. A steering tie rod 2 is hinged to one end of the nut 12. In this embodiment, the steering tie rod 2 is positioned along the length of the frame 5. It should be noted that the steering structure is located at the bottom of the frame 5, and the steering structure is connected to the steering gear structure 1 via the steering tie rod 2. Therefore, although the steering tie rod 2 is positioned along the length of the frame 5, it is not set to be parallel to the frame 5. Thus, when the nut 12 moves along the ball screw 11, it drives the steering tie rod 2 to move, thereby pushing the steering structure to rotate.

[0048] When the suspension bounces, the steering knuckle arm 3 bounces simultaneously around the steering gear output interface and the front leaf spring support of the suspension. To reduce the vertical bouncing of the steering gear structure 1 with the vehicle frame 5 caused by the suspension system's bounce during driving, which would cause the steering tie rod 2 to deflect the steering knuckle arm 3, thus reducing the motion interference between the electric steering system and the suspension system, the input interface of the steering tie rod 2 is positioned near the front leaf spring support of the suspension system. In this embodiment, the straight-line distance between the input interface of the steering tie rod 2 and the front leaf spring support of the suspension system is set to be less than a first set value, satisfying the requirement that the nut 12 is positioned near the front leaf spring support of the suspension system. When the suspension bounces, the steering knuckle arm 3 simultaneously bounces around the output interface to form trajectory 1 and around the front leaf spring support to form trajectory 2, which can increase the overlap of the two motion trajectories, thereby reducing the amount of motion interference between the electric steering system and the suspension system.

[0049] Therefore, in this application, when the steering wheel is turned, the steering gear structure 1 is driven to move, and the linear displacement of the steering tie rod 2 drives the steering knuckle body 7 to rotate, thereby realizing the steering action of the steering knuckle body 7; the linear distance between the input interface of the steering tie rod 2 and the front leaf spring support of the suspension system is less than a first set value, so as to reduce the difference between the motion trajectory of the input interface of the steering tie rod 2 and the front leaf spring support of the suspension system, increase the overlap of the motion trajectories of the two, and thus reduce the amount of motion interference between the electric steering system and the suspension system; at the same time, this application realizes the pure electrification of the steering system, and the output force of the electric steering gear structure 1 can fully meet the output force required by heavy commercial vehicles, and can be applied to the steering system of heavy commercial vehicles.

[0050] Based on the above embodiments, in this embodiment, both ends of the steering gear structure 1 are fixedly connected to the vehicle frame 5, and the fixing points between the steering gear structure 1 and the vehicle frame 5 are located at both ends of the steering gear structure 1.

[0051] Specifically, in this embodiment, one end of the servo motor 10 is fixedly connected to the frame 5, and one end of the ball screw 11 is fixedly connected to the frame 5. The fixing point between the servo motor 10 and the frame 5 is located on one side of the servo motor 10, and the fixing point between the ball screw 11 and the frame 5 is located on one side of the ball screw 11, so that the servo motor 10 and the ball screw 11 are located between the two fixing points, so that the steering gear structure 1 and the frame 5 form a simply supported beam, and the force distribution effect of the steering gear structure 1 and the frame 5 is better.

[0052] Based on the above embodiments, in this embodiment, the output interface is located between two fixed points.

[0053] Specifically, the nut 12 is positioned between two fixed points, and the output interface, i.e., the initial position of the nut 12, is located in the middle of the ball screw 11. This structure makes the total length of the steering gear structure 1 with the same stroke much shorter than that of existing solutions, resulting in a compact structure that can be installed on commercial vehicles with short front overhangs.

[0054] Based on the above embodiments, in this embodiment, the steering structure includes: a steering axle 4, a steering knuckle body 7, and a steering knuckle arm 3. The steering knuckle body 7 is hinged to the steering axle 4; one end of the steering knuckle arm 3 is connected to the steering knuckle body 7, and the other end is connected to the steering tie rod 2.

[0055] Specifically, the steering axle 4 is located at the bottom of the frame 5. Both ends of the steering axle 4 are hinged to steering knuckle bodies 7, and a tie rod 8 is hinged between the two steering knuckle bodies 7. The steering tie rod 2 is hinged to one of the steering knuckle bodies 7. Therefore, when the nut 12 moves along the ball screw 11, it drives the steering tie rod 2 to move. The steering tie rod 2 pushes the steering knuckle body 7 connected to it to rotate relative to the steering axle 4. When the steering knuckle body 7 rotates, it can drive the other steering knuckle body 7 to rotate relative to the steering axle 4 through the tie rod 8.

[0056] Based on the above embodiments, in this embodiment, the vertical distance between the output interface and the steering structure is less than the second set value. Setting the vertical distance between the output interface, i.e., the nut 12, and the steering knuckle arm 3, in this embodiment to be less than the second set value provides greater adaptability to low cab entry requirements. It should be noted that the second set value is set according to requirements.

[0057] In summary, replacing the original electro-hydraulic steering gear with a pure electric steering gear structure 1 eliminates the need for a steering pump, steering fluid reservoir, and steering lines, significantly reducing the number of parts, allowing for a more compact layout, and improving reliability. The pure electric steering gear structure 1 is more efficient and energy-saving than the electro-hydraulic steering gear, greatly contributing to the vehicle's fuel economy. Furthermore, the pure electric steering gear structure 1 is lighter than the electro-hydraulic steering gear body plus the combined weight of the steering pump, steering fluid reservoir, and hydraulic components, significantly contributing to the vehicle's lightweight design.

[0058] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An electric steering system, characterized in that, It includes: Frame (5); Steering structure, the steering structure including steering knuckle body (7); Steering gear structure (1), the steering gear structure (1) is mounted on the vehicle frame (5), one end of the steering gear structure (1) is used to connect with the drive shaft of the steering wheel, and the other end is provided with an output interface; Steering tie rod (2), one end of the input interface of the steering tie rod (2) is connected to the output interface, and the other end is connected to the steering knuckle body (7). The straight distance between the input interface of the steering tie rod (2) and the leaf spring front support lug of the suspension system is less than a first set value. The steering gear structure (1) is configured such that when the drive shaft of the steering wheel drives one end of the steering gear structure (1) to move, the output interface drives the steering tie rod (2) to move linearly, so as to drive the steering knuckle body (7) to rotate. The vertical distance between the output interface and the steering structure is less than the second set value.

2. The electric steering system as described in claim 1, characterized in that: Both ends of the steering gear structure (1) are fixedly connected to the vehicle frame (5), and the fixing points of the steering gear structure (1) and the vehicle frame (5) are located at both ends of the steering gear structure (1).

3. The electric steering system as described in claim 2, characterized in that: The output interface is located between the two fixed points.

4. The electric steering system as described in claim 1, characterized in that, The steering gear structure (1) includes: Servo motor (10); Angle drive (6), the angle drive (6) is disposed between the drive shaft of the steering wheel and the servo motor (10); A ball screw (11) is connected to the servo motor (10), and an output interface is movably connected to the ball screw (11).

5. The electric steering system as described in claim 4, characterized in that: The output interface is initially located in the middle of the ball screw (11).

6. The electric steering system as described in claim 4, characterized in that: The output interface is a nut (12), which is sleeved on the surface of the ball screw (11) and threadedly connected to the ball screw (11).

7. The electric steering system as described in claim 6, characterized in that: The nut (12) is provided with a mounting cone hole, and one end of the steering tie rod (2) is placed in the mounting cone hole.

8. The electric steering system as described in claim 1, characterized in that, The steering structure also includes: Steering axle (4), the steering knuckle body (7) is hinged to the steering axle (4); Steering knuckle arm (3), one end of which is connected to the steering knuckle body (7), and the other end of which is connected to the steering tie rod (2).

9. A car, characterized in that, It includes: The electric steering system as described in any one of claims 1-8; The suspension system is located on one side of the electric steering system, and the straight distance between the input interface of the steering tie rod (2) of the electric steering system and the front leaf spring lug of the suspension system is less than a first set value.

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