A closed-loop controllable independent steering system for automobiles

Abstract

A closed-loop controllable independent steering system for automobiles includes a steering system housing. A motor is mounted on one side of the housing, and a transmission mechanism is housed within the housing. The transmission mechanism includes a small pulley, a large pulley, a ball screw nut, and a ball screw. The small pulley is fixedly connected to the motor output shaft and drives the large pulley to rotate via a synchronous belt. The inner side of the large pulley is fixedly connected to the ball screw nut, which in turn connects to the ball screw, causing it to move laterally. The right end of the ball screw is fixedly connected to a sensor element, which is connected to a displacement sensor located on the outside of the steering system housing. The displacement sensor transmits signals to the motor via a wiring harness. The left side of the ball screw is fixedly connected to a tie rod. This steering system enables efficient and low-cost independent steering of all four wheels of a vehicle.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, specifically to an independent steering gear for automobiles that can be controlled in a closed loop. Background Technology

[0002] Existing R-EPS steering systems connect two wheels together, controlling both wheels to rotate simultaneously. This type of steering system has the following problems: 1. Both wheels must rotate simultaneously, making it impossible to decouple the individual wheels, resulting in a limited function; 2. To monitor the operating status and achieve closed-loop control, it must be used in conjunction with a rack and pinion system, resulting in a large number of complex parts and high cost; 3. It occupies a large space and has low integration.

[0003] In order to meet the increasing functional requirements and application scenarios of automobiles, such as U-turns, lateral parking, and safety requirements such as high-speed four-wheel rotation in the same direction to improve driving stability, it is necessary to realize independent steering for each wheel of the car.

[0004] Currently, single-wheel steering is mainly achieved through kingpin steering systems. However, this type of steering system has the following problems: 1. It generally requires a multi-stage gear reduction mechanism such as worm gears and planetary gears, resulting in low transmission efficiency, complex structure, and high cost; 2. The meshing of multi-stage gears is prone to generating unacceptable noise and abnormal sounds, affecting the overall NVH performance of the vehicle; 3. Directly outputting torque to drive the wheel rotation places a huge reaction torque on the reduction mechanism, making it difficult to guarantee its strength; 4. The installation method is special, and it can hardly be directly used in existing models on the market. It requires a completely new chassis design, has harsh usage conditions, and is difficult to mass-produce. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a closed-loop controllable independent steering system for automobiles. This steering system enables efficient and low-cost independent steering of all four wheels of a vehicle.

[0006] The purpose of this utility model is achieved by the following solution: a closed-loop controllable independent steering gear for automobiles, including a steering gear housing, a motor disposed on one side of the steering gear housing, and a transmission mechanism disposed in the steering gear housing. The transmission mechanism includes a small pulley, a large pulley, a ball screw nut, and a ball screw. The small pulley is fixedly connected to the output shaft of the motor. The small pulley drives the large pulley to rotate through a synchronous belt. The inner side of the large pulley is fixedly connected to the ball screw nut. The inner side of the ball screw nut is connected to the ball screw, which drives the ball screw to move laterally. The right end of the ball screw is fixedly connected to a sensor plate. The sensor plate is connected to a displacement sensor disposed on the outside of the steering gear housing. The displacement sensor transmits signals to the motor through a wiring harness. The left side of the ball screw is fixedly connected to a tie rod.

[0007] The steering gear housing includes a main steering gear housing and a secondary steering gear housing. The transmission mechanism is located in the secondary steering gear housing, and the right side of the ball screw extends into the main steering gear housing.

[0008] The pull rod includes an inner pull rod and an outer pull rod. One end of the inner pull rod is connected and fixed to the left end of the ball screw, and the other end of the inner pull rod is connected and fixed to one end of the outer pull rod. The other end of the outer pull rod is connected to the wheel.

[0009] A dust cover is provided on the outside of the pull rod.

[0010] The advantages of this invention are: this steering gear can control the independent steering of a single wheel of a car, and uses a displacement sensor to replace the complex working status monitoring module of the traditional steering gear (a module composed of multiple parts such as gear rack and angle sensor), realizing closed-loop control and simple structure; it uses a high-efficiency and low-noise synchronous belt drive plus ball screw as a reduction mechanism, realizing independent steering of four wheels of the car with high efficiency and low cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the transmission mechanism. Figure 3 This is a schematic diagram of the displacement sensor connection. Detailed Implementation

[0012] like Figures 1 to 3 As shown, a closed-loop controllable independent steering system for automobiles includes a steering system housing. A motor 5 is installed on one side of the steering system housing. The steering system housing includes a main steering system housing 8 and a secondary steering system housing 4. A transmission mechanism is installed in the steering system housing and is located in the secondary steering system housing 4. The transmission mechanism includes a small pulley 9, a large pulley 11, a ball screw nut 12, and a ball screw 13. The small pulley 9 is fixedly connected to the output shaft of the motor 5. The small pulley 9 drives the large pulley 11 to rotate via a synchronous belt 10. The inner side of the large pulley 11 is fixedly connected to the ball screw nut 12. The inner side of the ball screw nut 12 is connected to the ball screw 13, which drives the ball screw 13 to move laterally. The right end of the ball screw 13 is fixedly connected to a sensor element 14 and extends into the main steering system housing 8. The sensor element 14 is connected to a displacement sensor 7 located on the outside of the steering system housing. The displacement sensor 7 transmits signals to the motor 5 via a wiring harness 6. The left side of the ball screw 13 is fixedly connected to a tie rod. The pull rod includes an inner pull rod 2 and an outer pull rod 1. One end of the inner pull rod 2 is connected and fixed to the left end of the ball screw 13, and the other end of the inner pull rod 2 is connected and fixed to one end of the outer pull rod 1. The other end of the outer pull rod 1 is connected to the wheel. A pull rod dust cover 3 is provided on the outside of the pull rod.

[0013] When the steering system is in operation, the vehicle's ECU transmits a signal to motor 5. Motor 5 drives the small pulley 9 and the large pulley 11 to rotate. The large pulley 11 is fixedly connected to the lead screw nut 12. The lead screw nut 12 drives the lead screw 13 to move laterally. The lead screw is fixedly connected to the inner tie rod 2, and the inner tie rod 2 is fixedly connected to the outer tie rod 1. The outer tie rod 1 is connected to the vehicle wheel, causing the wheel to rotate and thus achieving steering. The displacement sensor 7 monitors the displacement of the lead screw 13 by identifying the position of the sensor element 14, and transmits the signal to motor 5 through wiring harness 6, achieving closed-loop control of the power steering by steer.

[0014] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A closed loop controllable automotive independent steering gear comprising a steering gear housing, characterized in that A motor (5) is installed on one side of the steering gear housing, and a transmission mechanism is installed in the steering gear housing. The transmission mechanism includes a small pulley (9), a large pulley (11), a ball screw nut (12), and a ball screw (13). The small pulley (9) is fixedly connected to the output shaft of the motor (5). The small pulley (9) drives the large pulley (11) to rotate through the synchronous belt (10). The inner side of the large pulley (11) is fixedly connected to the ball screw nut (12). The inner side of the ball screw nut (12) is connected to the ball screw (13) to drive the ball screw (13) to move laterally. The right end of the ball screw (13) is fixedly connected to the sensor sensing plate (14). The sensor sensing plate (14) is connected to the displacement sensor (7) installed on the outside of the steering gear housing. The displacement sensor (7) transmits the signal to the motor (5) through the wiring harness (6). The left side of the ball screw (13) is fixedly connected to the pull rod.

2. A closed loop controllable automotive independent steering gear according to claim 1, characterized in that: The steering gear housing includes a main steering gear housing (8) and a secondary steering gear housing (4). The transmission mechanism is located in the secondary steering gear housing (4), and the right side of the ball screw (13) extends into the main steering gear housing (8).

3. The closed-loop controllable independent steering system for automobiles according to claim 1, characterized in that: The pull rod includes an inner pull rod (2) and an outer pull rod (1). One end of the inner pull rod (2) is connected and fixed to the left end of the ball screw (13), and the other end of the inner pull rod (2) is connected and fixed to one end of the outer pull rod (1). The other end of the outer pull rod (1) is connected to the wheel.

4. The closed-loop controllable independent steering system for automobiles according to claim 1, characterized in that: A dust cover (3) is provided on the outside of the pull rod.

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