Steer-by-wire road feeling simulator

Abstract

The utility model discloses a steering-by-wire road feeling simulator, and belongs to the technical field of automobile manufacturing. The steering-by-wire road feeling simulator comprises a shell, one end of the shell is provided with a motor controller assembly, and the other end of the shell is connected with an input shaft; a connecting shaft is arranged in the shell, the end, close to the inner side, of the connecting shaft is connected with a torsion bar, and the end of the input shaft extends into the shell to be connected with the torsion bar. One end of the connecting shaft close to the input shaft is provided with an angular displacement sensor rotor, and one end of the input shaft close to the connecting shaft is provided with an angular displacement sensor stator matched with the angular displacement sensor rotor. The manufacturability of products is greatly optimized, meanwhile, the cost of parts is reduced, the energy loss in the steering process is improved, the structure is simplified, and the weight is reduced.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and more specifically, to a steer-by-wire road feel simulator. Background Technology

[0002] In the field of automotive manufacturing technology, the performance optimization of steering systems has always been a core issue of concern in the industry. Traditional power steering systems generally rely on worm gear reduction mechanisms to achieve speed reduction and torque amplification. This structure requires an intermediate shaft to indirectly transmit the motor's power assist to the steering gear, while the driver's steering intention must be transmitted to the steering wheels through complex mechanical components such as the steering gear and tie rods. However, such traditional solutions have significant technical bottlenecks: on the one hand, the efficiency of worm gear transmission is only 70%-80%, and high energy consumption is accompanied by serious heat generation problems, which easily leads to component wear and adhesion, resulting in increased maintenance costs; on the other hand, the multi-level mechanical transmission structure leads to cumbersome assembly processes, large component weight, and the large radial space required by the worm gear mechanism, which restricts the layout of compact vehicles and makes it difficult to meet the design requirements of modern automobiles for lightweighting and modularization. In view of this, we propose a steer-by-wire road feel simulator. Utility Model Content

[0003] The purpose of this invention is to provide a steer-by-wire road feel simulator to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A drive-by-wire road feel simulator includes a housing, a motor controller assembly is disposed at one end of the housing, and an input shaft is connected to the other end of the housing;

[0006] A connecting shaft is provided inside the housing, and a torsion bar is connected to one end of the connecting shaft near the inside. The end of the input shaft extends into the housing and is connected to the torsion bar.

[0007] An angular displacement sensor rotor is provided at one end of the connecting shaft near the input shaft, and an angular displacement sensor stator that cooperates with the angular displacement sensor rotor is provided at the other end of the input shaft near the connecting shaft.

[0008] Self-aligning ball bearings and deep groove ball bearings are respectively installed near both ends of the housing, and the self-aligning ball bearings and deep groove ball bearings are respectively sleeved on both ends of the connecting shaft.

[0009] Preferably, the output shaft of the motor controller assembly is connected to the connecting shaft via a coupling.

[0010] Preferably, the self-aligning ball bearing is located inside the housing at one end near the motor controller assembly, and the deep groove ball bearing is located inside the housing at one end near the input shaft.

[0011] Preferably, a drive shaft is connected to one end of the input shaft on the outside, and the inner end of the input shaft is connected to a torsion bar via a cylindrical pin.

[0012] Preferably, one end of the connecting shaft has a mounting hole, and one end of the torsion bar extends into the mounting hole.

[0013] Preferably, the rotor of the angular displacement sensor and the stator of the angular displacement sensor are coaxially arranged.

[0014] Preferably, a sliding bearing is provided between the connecting shaft and the torsion bar.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention achieves direct steering by modifying the internal structure of the housing, reducing the original worm gear reduction mechanism, compressing the product's radial space, significantly optimizing the product's manufacturability, and lowering component costs. Traditional methods using a reduction and torque-increasing mechanism require an additional worm chamber within the housing to assemble the worm gear assembly, and a worm wheel must be pressed onto the input shaft, resulting in complex manufacturing processes and poor consistency in the worm gear assembly. This application eliminates the worm gear reduction structure, reducing product weight and cost. Furthermore, the direct-drive structure with direct motor assistance improves energy efficiency during steering and simplifies the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0019] The following are the labels in the diagram: 1. Housing; 2. Coupling; 3. Self-aligning ball bearing; 4. Connecting shaft; 5. Torsion bar; 6. Sliding bearing; 7. Deep groove ball bearing; 8. Angular displacement sensor rotor; 9. Angular displacement sensor stator; 10. Input shaft; 11. Cylindrical pin; 12. Motor controller assembly; 13. Drive shaft. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Example:

[0022] Please see Figure 1-2A steer-by-wire road feel simulator includes a housing 1. A motor controller assembly 12 is mounted at one end of the housing 1, and an input shaft 10 is connected to the other end. The housing 1 serves as the basic frame of the simulator, providing a mounting carrier and physical support for all internal components, ensuring the accuracy of the relative positions of each component, and maintaining the overall structural stability. The motor inside the motor controller assembly 12 acts as a power source, converting electrical energy into mechanical energy and outputting torque to provide the steering power required for the entire steer-by-wire system, driving the connecting shaft 4 to rotate. The driver directly drives the input shaft 10 by turning the steering wheel, converting changes in steering force and angle into mechanical motion, which serves as the system's input signal.

[0023] A connecting shaft 4 is installed inside the housing 1. A torsion bar 5 is connected to one end of the connecting shaft 4 near its inner side. The end of the input shaft 10 extends into the housing 1 and connects to the torsion bar 5. One end of the connecting shaft 4 has a mounting hole, and one end of the torsion bar 5 extends into the mounting hole. The connecting shaft 4 serves as an intermediate link in power transmission, transferring the power output from the motor controller assembly 12 from one end of the housing 1 to the other. Simultaneously, it integrates and further transmits the torque transmitted from the input shaft 10 via the torsion bar 5, ensuring effective power transmission within the system. The torsion bar 5 possesses elastic properties; when there is relative rotation between the input shaft 10 and the connecting shaft 4, the torsion bar 5 undergoes elastic deformation, generating an elastic restoring force. This force is fed back to the driver, simulating road resistance and steering feel under different road conditions and steering maneuvers, providing the driver with a realistic steering feel. Simultaneously, while transmitting torque, the torsion bar 5 absorbs and buffers the impact and vibration caused by sudden changes in motor start-up, stopping, or steering operation, reducing the impact on other components of the system, protecting the transmission system, and improving the system's reliability and stability.

[0024] An angular displacement sensor rotor 8 is mounted on the end of the connecting shaft 4 near the input shaft 10, and an angular displacement sensor stator 9, which mates with the rotor 8, is mounted on the end of the input shaft 10 near the connecting shaft 4. The rotor 8 and stator 9 are coaxially arranged. The rotor 8 and stator 9 work together to accurately measure the relative rotation angle between the connecting shaft 4 and the input shaft 10 in real time. By detecting the angle difference, the deformation of the torsion bar 5 is obtained, thus reflecting the driver's steering input and road resistance.

[0025] Inside the housing 1, near both ends, are respectively fitted self-aligning ball bearings 3 and deep groove ball bearings 7, which are respectively sleeved on both ends of the connecting shaft 4. The self-aligning ball bearings 3 are self-aligning; their outer ring raceways are spherical, automatically compensating for angular misalignment of the connecting shaft 4 during installation or operation. This ensures that the connecting shaft 4 can still rotate normally even with a certain range of misalignment, reducing component wear and stress concentration caused by shaft misalignment, and improving the system's installation adaptability and operational reliability. The deep groove ball bearings 7 provide high-precision support; both inner and outer rings have deep groove raceways, ensuring tight contact with the steel balls. This provides high-precision radial support, guaranteeing the rotational accuracy of the connecting shaft 4, reducing radial runout and vibration during rotation, ensuring smooth operation of the steering system, and improving the accuracy and comfort of steering operation.

[0026] When the steering wheel is turned, the input shaft 10 drives the torsion bar 5 to rotate. The relative angle between the angular displacement sensor stator 9 mounted on the input shaft 10 and the angular displacement sensor rotor 8 mounted on the connecting shaft 4 is generated. After being read by the sensor, the angle and torque are sent to the controller on the motor controller assembly 12. At the same time, the controller receives signals such as the current vehicle speed and controls the motor to rotate through the preset software control strategy to achieve electric power assist.

[0027] In this application, the output shaft of the motor controller assembly 12 is connected to the connecting shaft 4 via a coupling 2. The coupling 2 efficiently transmits the torque generated by the motor from the output shaft to the connecting shaft 4. The motor, as a power source, transmits its rotational power to subsequent transmission components to drive the entire steering system. The coupling 2 ensures smooth power transmission, guaranteeing that the steering system can respond promptly to the driver's steering inputs and provide the necessary power support for vehicle steering.

[0028] In this application, the self-aligning ball bearing 3 is disposed within the housing 1 at one end near the motor controller assembly 12, and the deep groove ball bearing 7 is disposed within the housing 1 at one end near the input shaft 10. The self-aligning ball bearing 3 and the deep groove ball bearing 7 bear the radial load generated by the connecting shaft 4 during rotation, providing stable support for the connecting shaft 4, ensuring its rotational accuracy and stability, and ensuring smooth operation of the steering system.

[0029] In this application, a drive shaft 13 is connected to one outer end of the input shaft 10, and the inner end of the input shaft 10 is connected to a torsion bar 5 via a cylindrical pin 11. The drive shaft 13 is connected to the vehicle's steering wheel or other steering mechanism. The connection between the input shaft 10 and the drive shaft 13 enables the accurate transmission of input signals such as steering force and steering angle applied by the driver through the steering wheel to the steer-by-wire road feel simulator, providing the original input basis for subsequent simulation of road feel and implementation of steering control.

[0030] In this application, a sliding bearing 6 is provided between the connecting shaft 4 and the torsion bar 5. When the connecting shaft 4 and the torsion bar 5 rotate relative to each other, the sliding bearing 6 acts as an intermediate medium, transforming the original direct friction between the connecting shaft 4 and the torsion bar 5 into friction between the connecting shaft 4 and the sliding bearing 6, and between the sliding bearing 6 and the torsion bar 5, thereby significantly reducing the coefficient of friction. This reduces energy loss caused by friction and improves the transmission efficiency of the entire steer-by-wire road feel simulator.

[0031] This application achieves direct steering by modifying the internal structure of housing 1, reducing the original worm gear reduction mechanism, compressing the product's radial space, significantly optimizing the product's manufacturability, and lowering component costs. Traditionally, a reduction and torque-increasing mechanism is used, requiring an additional worm chamber within housing 1 to assemble the worm gear assembly, and a worm wheel to be pressed onto the input shaft, resulting in complex manufacturing processes and poor consistency in the worm gear assembly. This application eliminates the worm gear reduction structure, reducing product weight and cost. Furthermore, the direct-drive structure with direct motor assistance improves energy efficiency during steering, simplifying the structure, reducing weight, and lowering costs.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steer-by-wire road feel simulator comprising a housing (1), characterized in that: The shell (1) is provided with a motor controller assembly (12) at one end, and an input shaft (10) is connected to the other end of the shell (1); A connecting shaft (4) is arranged in the shell (1), and a torsion bar (5) is connected to the connecting shaft (4) near the inner end; the input shaft (10) extends into the shell (1) and is connected to the torsion bar (5); An angular displacement sensor rotor (8) is arranged on the connecting shaft (4) near the input shaft (10), and an angular displacement sensor stator (9) is arranged on the input shaft (10) near the connecting shaft (4) and cooperates with the angular displacement sensor rotor (8).

2. A steer-by-wire road-feel simulator according to claim 1, characterized in that: A self-aligning ball bearing (3) and a deep groove ball bearing (7) are arranged in the shell (1) near the two ends, respectively, and the self-aligning ball bearing (3) and the deep groove ball bearing (7) are sleeved on the two ends of the connecting shaft (4), respectively.

3. The steer-by-wire road-feel simulator according to claim 1, characterized in that: The output shaft of the motor controller assembly (12) is connected to the connecting shaft (4) through a coupling (2).

4. A steer-by-wire road-feel simulator according to claim 2, characterized in that: The self-aligning ball bearing (3) is arranged in the shell (1) near the motor controller assembly (12), and the deep groove ball bearing (7) is arranged in the shell (1) near the input shaft (10).

5. The steer-by-wire road-feel simulator according to claim 1, wherein: A transmission shaft (13) is connected to the outer end of the input shaft (10), and the input shaft (10) is connected to the torsion bar (5) through a cylindrical pin (11) on the inner side.

6. A steer-by-wire road-feel simulator according to claim 1, characterized in that: A mounting hole is formed in one end of the connecting shaft (4), and one end of the torsion bar (5) extends into the mounting hole.

7. The steer-by-wire road-feel simulator according to claim 1, wherein: The angular displacement sensor rotor (8) and the angular displacement sensor stator (9) are coaxially arranged.

8. The steer-by-wire road-feel simulator according to claim 1, wherein: A sliding bearing (6) is arranged between the connecting shaft (4) and the torsion bar (5).

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