Power-assisted steering dual-redundancy structure of automobile chassis

Abstract

The utility model discloses a power-assisted steering dual redundant structure of an automobile chassis, which relates to the technical field of power-assisted steering and comprises a transmission box, a transmission shaft is slidably connected in the transmission box, a threaded sleeve is slidably connected on the surface of the transmission shaft, a worm gear is rotatably connected on the inner wall of the transmission box, and the worm gear is rotatably connected on the inner wall of the transmission box. Compared with the prior art, the power-assisted steering device has the advantages that power-assisted steering is carried out through dual redundancy, during normal work, the servo motor can assist steering through turbine worm transmission, the first redundancy is power-assisted steering of the electric telescopic rod, and when the servo motor breaks down and cannot work, the electric telescopic rod can drive the transmission box to integrally move, so that the power-assisted steering effect is achieved. The second redundancy is a pure mechanical device, when a servo motor and an electric telescopic rod both break down and cannot work, a driver can directly drive a steering shaft to rotate through a steering wheel, and the steering shaft drives a transmission shaft to conduct mechanical steering through gear and rack transmission.

Description

Technical Field

[0001] The utility model relates to the technical field of power steering, in particular to a dual-redundancy structure of power steering for an automobile chassis. Background Art

[0002] Steering redundancy is a structural design that uses additional steering components or backup mechanisms in vehicles, mechanical devices, or other systems that require steering functions to improve the reliability of the steering system. Its purpose is to ensure that the redundant part can take over when the main steering component fails, ensuring that the system can still perform steering operations, thereby improving safety.

[0003] After searching, the applicant discovered a Chinese patent for "a wire-controlled redundant steering system" with the publication (announcement) number "CN109760737A". This patent mainly uses two motors to ensure that the vehicle can still steer when one motor fails. In the extreme case where both motors fail, the driver will be unable to control the steering. Therefore, we propose a dual-redundancy structure for the power steering of the automobile chassis to address the defects in the existing technology. Utility Model Content

[0004] To achieve the above objectives, the present invention provides a dual-redundancy structure for power steering in an automobile chassis. This simple structure provides dual redundancy, resolving the technical drawback of prior art, where the driver cannot control the steering in extreme situations, thereby improving controllability and safety in these extreme conditions.

[0005] The utility model provides the following technical solution: a dual redundant structure of power steering for an automobile chassis, comprising a transmission box, a transmission shaft slidably connected inside the transmission box, a threaded sleeve slidably connected to the surface of the transmission shaft, a worm gear rotatably connected to the inner wall of the transmission box, a worm rotatably connected inside the transmission box, a rack fixedly connected to the surface of the transmission shaft, the upper end surface of the transmission box rotatably connected to the steering shaft, the bottom end of the steering shaft passes through the inner wall of the transmission box and is fixedly connected to a gear, an electromagnetic slot is provided on the surface of the transmission shaft, a limiting block is slidably connected inside the electromagnetic slot, a limiting slot is provided on the inner wall of the threaded sleeve, the side surface of the limiting block is clamped with the inner wall of the limiting slot, the surface of the transmission box is slidably connected to a fixed block, and the side surface of the fixed block is fixedly connected to an electric telescopic rod.

[0006] The upper end surface of the transmission box is fixedly connected to a servo motor, and the top end of the worm passes through the upper end surface of the transmission box and is fixedly connected to the output end of the servo motor.

[0007] Furthermore, the telescopic end of the electric telescopic rod is fixedly connected to the side wall of the transmission box.

[0008] Furthermore, the worm is meshed with the surface of the worm wheel, and the surface of the gear is meshed with the surface of the rack.

[0009] Furthermore, the shape of the limiting block matches the shape of the inner wall of the electromagnetic slot, and the shape of the limiting block matches the shape of the inner wall of the limiting slot.

[0010] Furthermore, the surface of the threaded sleeve is threadedly connected to the inner wall of the worm wheel, and the diameter of the threaded sleeve matches the inner diameter of the worm wheel.

[0011] Furthermore, a spring is fixedly connected in the electromagnetic slot, and one end of the spring is fixedly connected to the side wall of the limit block.

[0012] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This utility model uses dual redundancy for power steering. During normal operation, the servo motor can assist the steering through a worm gear transmission. The first level of redundancy is the electric telescopic rod power steering. If the servo motor fails to work, the electric telescopic rod can drive the transmission box to move as a whole, thus assisting the steering. The second level of redundancy is a purely mechanical device. If both the servo motor and the electric telescopic rod fail to work, the driver can directly drive the steering shaft through the steering wheel to rotate. The steering shaft then drives the transmission shaft through a rack and pinion transmission for mechanical steering.

[0014] 2. The utility model allows the driver to manually control the current in the electromagnetic slot. When both the servo motor and the electric telescopic rod fail, the limit block can be separated from the limit slot, providing a purely mechanical backup system. This allows the driver to directly drive the drive shaft to move for steering, greatly improving the overall reliability of the steering system. Even if one component fails, the other component can ensure the steering function, effectively reducing equipment downtime or safety accidents caused by steering system failures.

[0015] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0017] Figure 2 This is a structural diagram of a fixing block in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic cross-sectional view of the transmission box in an embodiment of the present utility model;

[0019] Figure 4 This is a schematic structural diagram of the transmission shaft in an embodiment of the present utility model;

[0020] Figure 5 This is a schematic structural diagram of a rack in an embodiment of the present utility model;

[0021] Figure 6 It is a schematic cross-sectional structural diagram of the threaded sleeve in the embodiment of the present utility model.

[0022] In the figure: 1. Transmission box; 2. Steering shaft; 3. Transmission shaft; 4. Electric telescopic rod; 5. Fixed block; 6. Servo motor; 7. Worm; 8. Worm gear; 9. Threaded sleeve; 10. Rack; 11. Gear; 12. Limit block; 13. Electromagnetic slot; 14. Spring; 15. Limit slot. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0024] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] See Figure 1-6 The utility model discloses a dual redundant structure of power steering for automobile chassis, including a transmission box 1, a transmission shaft 3 is slidably connected in the transmission box 1, a threaded sleeve 9 is slidably connected to the surface of the transmission shaft 3, a worm gear 8 is rotatably connected to the inner wall of the transmission box 1, a worm 7 is rotatably connected in the transmission box 1, a rack 10 is fixedly connected to the surface of the transmission shaft 3, the upper end surface of the transmission box 1 is rotatably connected to the steering shaft 2, the bottom end of the steering shaft 2 passes through the inner wall of the transmission box 1 and is fixedly connected to a gear 11, an electromagnetic slot 13 is provided on the surface of the transmission shaft 3, a limit block 12 is slidably connected in the electromagnetic slot 13, a limit slot 15 is provided on the inner wall of the threaded sleeve 9, and the limit block 1 2 is snapped into engagement with the inner wall of the limiting groove 15, the surface of the transmission box 1 is slidably connected with a fixed block 5, the side of the fixed block 5 is fixedly connected with an electric telescopic rod 4, the worm 7 is meshed with the surface of the worm wheel 8, the surface of the gear 11 is meshed with the surface of the rack 10, the shape of the limiting block 12 matches the shape of the inner wall of the electromagnetic slot 13, the shape of the limiting block 12 matches the shape of the inner wall of the limiting groove 15, the surface of the threaded sleeve 9 is threadedly connected to the inner wall of the worm wheel 8, the diameter of the threaded sleeve 9 matches the inner diameter of the worm wheel 8, a spring 14 is fixedly connected in the electromagnetic slot 13, and one end of the spring 14 is fixedly connected to the side wall of the limiting block 12.

[0026] In the first embodiment, the upper end surface of the transmission box 1 is fixedly connected to the servo motor 6, and the top end of the worm 7 passes through the upper end surface of the transmission box 1 and is fixedly connected to the output end of the servo motor 6;

[0027] Specifically, the servo motor 6 can work during normal driving. The torque when the driver turns the steering wheel can be converted into an electrical signal through the torque sensor and transmitted to the servo motor 6. The servo motor 6 drives the worm wheel 8 to rotate through the worm 7. When the turbine rotates, it can drive the threaded sleeve 9 to move. The threaded sleeve 9 drives the rotating shaft to move, which can provide assistance for steering.

[0028] In the second embodiment, the telescopic end of the electric telescopic rod 4 is fixedly connected to the side wall of the transmission box 1;

[0029] Specifically, the electric telescopic rod 4 is set as the first redundancy. When the servo motor 6 fails to work, the steering control software in the vehicle's electronic control unit has a main algorithm and a first backup algorithm. The main algorithm is used for normal steering control. The first backup algorithm is activated when an error occurs in the main algorithm to ensure that the steering system can continue to work. At this time, the electric telescopic rod 4 can replace the servo motor 6 for steering assistance, and the electric telescopic rod 4 can drive the transmission box 1 to move as a whole at the same time.

[0030] Working principle:

[0031] First, during normal operation, the steering control software in the vehicle's electronic control unit uses the main algorithm to operate. The torque of the steering wheel turned by the driver can be converted into an electrical signal through the torque sensor and transmitted to the servo motor 6. The servo motor 6 drives the worm 7 to rotate, and the worm 7 drives the worm wheel 8 to rotate. The worm wheel 8 can drive the threaded sleeve 9 threadedly connected to it to rotate. At this time, the limit block 12 is stuck in the limit groove 15, and the threaded sleeve 9 can drive the drive shaft 3 to move, which can achieve steering assistance. When the servo motor 6 fails to work, the steering control software in the vehicle's electronic control unit uses the first backup algorithm to operate. The torque of the steering wheel turned by the driver can be converted into an electrical signal through the torque sensor and transmitted It is passed to the electric telescopic rod 4. When the electric telescopic rod 4 is extended and retracted, it can drive the transmission box 1 to move as a whole, and can also provide power steering. When the first redundancy fails and cannot work, the steering control software in the vehicle's electronic control unit uses the second backup algorithm to operate. At this time, the magnetic field generated in the electromagnetic slot 13 will drive the limit block 12 to retract inward and compress the spring 14. The limit block 12 is separated from the limit slot 15, and the steering shaft 2 can slide freely in the threaded sleeve 9. At the same time, the self-locking property between the worm gear 8 and the worm 7 and the thread engagement can limit the threaded sleeve 9. At this time, the torque of the steering wheel turned by the driver can directly act on the drive shaft 3 through the gear 11 and rack 10, and directly drive the drive shaft 3 to move and steer through the mechanical method. At this point, the entire work process is completed.

[0032] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0035] For those skilled in the art, it is possible to make various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention, and they still fall within the scope of protection of the present invention.

Claims

1. A dual redundant structure for power steering of an automobile chassis, comprising a transmission box (1), characterized in that: The transmission box (1) is slidably connected to a transmission shaft (3), the surface of the transmission shaft (3) is slidably connected to a threaded sleeve (9), the inner wall of the transmission box (1) is rotatably connected to a worm gear (8), the transmission box (1) is rotatably connected to a worm (7), the surface of the transmission shaft (3) is fixedly connected to a rack (10), the upper end surface of the transmission box (1) is rotatably connected to a steering shaft (2), the bottom end of the steering shaft (2) passes through the inner wall of the transmission box (1) and is fixedly connected to a gear (11), the surface of the transmission shaft (3) is provided with an electromagnetic slot (13), the electromagnetic slot (13) is slidably connected to a limiting block (12), the inner wall of the threaded sleeve (9) is provided with a limiting slot (15), the side surface of the limiting block (12) is engaged with the inner wall of the limiting slot (15), the surface of the transmission box (1) is slidably connected to a fixed block (5), the side surface of the fixed block (5) is fixedly connected to an electric telescopic rod (4), The upper end surface of the transmission box (1) is fixedly connected to a servo motor (6), and the top end of the worm (7) passes through the upper end surface of the transmission box (1) and is fixedly connected to the output end of the servo motor (6).

2. The dual-redundancy structure of the automobile chassis power steering according to claim 1, characterized in that: The telescopic end of the electric telescopic rod (4) is fixedly connected to the side wall of the transmission box (1).

3. The dual-redundancy structure of the automobile chassis power steering according to claim 2, characterized in that: The worm (7) is meshed with the surface of the worm wheel (8), and the surface of the gear (11) is meshed with the surface of the rack (10).

4. The dual-redundancy structure of the automobile chassis power steering according to claim 3, characterized in that: The shape of the limiting block (12) matches the shape of the inner wall of the electromagnetic slot (13), and the shape of the limiting block (12) matches the shape of the inner wall of the limiting slot (15).

5. The dual-redundancy structure of the automobile chassis power steering according to claim 4, characterized in that: The surface of the threaded sleeve (9) is threadedly connected to the inner wall of the worm wheel (8), and the diameter of the threaded sleeve (9) matches the inner diameter of the worm wheel (8).

6. The dual-redundancy structure of the automobile chassis power steering according to claim 5, characterized in that: A spring (14) is fixedly connected in the electromagnetic slot (13), and one end of the spring (14) is fixedly connected to the side wall of the limiting block (12).

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