Novel displacement detection mechanism of steer-by-wire actuator
By adopting a design in which the arc sensing surface coincides with the center of the core shaft in the wire-controlled steering actuator, the problem of the relative position accuracy of the sensing plate and the sensor body being affected by the rotational torque is solved, and high-precision displacement detection is achieved.
Patent Information
- Application Number
- CN202422902491.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-27
AI Technical Summary
In existing wire-controlled steering actuators, during the rotation of the core shaft, the relative position accuracy of the sensor plate and the sensor body is affected by the rotational torque, resulting in reduced control accuracy, and the gap wear causes the sensor accuracy to gradually decrease.
The arc sensing surface is designed to coincide with the center of the core shaft. The sensing block maintains its relative position to the displacement sensor unchanged during torsion. Combined with the fixing method of the limit groove and threaded hole, the precise position sensing of the sensing block is ensured.
By coinciding the arc sensing surface with the center of the core shaft, the relative position of the sensing block and the sensor is kept stable, which improves the measurement accuracy of the displacement sensor and reduces the influence of wear on the accuracy.
Smart Images
Figure CN223370940U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile electric steering systems, in particular to a novel displacement detection mechanism of a wire-controlled steering actuator. Background Art
[0002] The steer-by-wire system eliminates the mechanical connection between the steering wheel and the actuator. During steering control, the core shaft position of the steering actuator needs to be detected and confirmed in real time to achieve closed-loop control. Displacement detection is generally achieved using a displacement sensor. Since the steering actuator is installed on the vehicle chassis, signal interference must be avoided. Therefore, for the steer-by-wire actuator, its displacement sensor must have both high precision and high EMC performance.
[0003] There is a certain gap between the mounting base of the sensor plate of the existing wire-controlled steering actuator and the shell. However, when the core shaft is changing direction or moving left and right, there will always be a rotational torque around the core shaft axis. Under the action of the rotational torque, there will be a certain swing angle between the sensor plate and the sensor body. This swing angle will affect the relative position accuracy of the sensor body and the sensor plate, and thus affect the control accuracy. Moreover, this gap will gradually increase with use and wear, and the accuracy of the displacement sensor will gradually decrease. Utility Model Content
[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a novel displacement detection mechanism for a wire-controlled steering actuator, which can effectively solve the problems in the background technology.
[0005] To achieve the above-mentioned objectives, the present invention discloses a novel displacement detection mechanism for a wire-controlled steering actuator, employing a technical solution comprising a housing. A motor is located in the middle of the housing, the output shaft of the motor being connected to a bidirectional lead screw, a core shaft is rotatably connected to the housing on either side of the lead screw, threaded sleeves are provided on either side of the core shaft, and the core shaft engages with the bidirectional lead screw via the threaded sleeves, a limiting groove is provided in the housing above the core shaft, a displacement sensor is detachably connected to the limiting groove, and a sensing block is provided on the core shaft within the limiting groove, the top of the sensing block having an arc-shaped sensing surface.
[0006] As a preferred technical solution of the present invention, an induction coil is provided inside the displacement sensor for sensing the position of the induction block.
[0007] As an optimal technical solution of the present invention, the center of the circular arc sensing surface coincides with the center of the core shaft. When the core shaft moves left and right, a torsional torque is generated, which causes the sensing block to twist. When the circular arc sensing surface and the center of the core shaft coincide, no matter how the sensing block twists, the position of the circular arc sensing surface and the displacement sensor is consistent, thereby ensuring the measurement accuracy of the displacement sensor.
[0008] As an optimal technical solution of the present invention, a threaded hole is provided on the core shaft inside the limiting groove, and the sensing block is fixed to the core shaft through the threaded hole and bolts. When the sensing block is worn or damaged, it is convenient to adjust and replace the sensing block.
[0009] As an optimal technical solution of the present invention, through holes are provided at the four corners of the displacement sensor, threads are provided at the relative positions of the limiting groove and the through holes, and the displacement sensor is fixed to the limiting groove by screws passing through the through holes.
[0010] Compared with the prior art, the beneficial effect of the present invention is that the center of the arc sensing surface is coincident with the center of the core shaft, and when the motor rotates to drive the core shaft to move left and right, a torsional torque is generated, which causes the sensing block to twist. At this time, no matter how the sensing block twists, the position between the arc sensing surface and the displacement sensor is consistent, thereby ensuring the measurement accuracy of the displacement sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the structure of the utility model;
[0012] Figure 2 This is a cross-sectional view of the structure of the utility model;
[0013] Figure 3 This is an enlarged view of structure A of the utility model;
[0014] Figure 4 This is a schematic diagram of the structure of the induction block of the utility model.
[0015] In the figure: 1. Housing; 101. Limiting groove; 2. Motor; 3. Bidirectional screw; 4. Mandrel; 401. Threaded sleeve; 402. Threaded hole; 5. Sensing block; 501. Bolt; 502. Arc sensing surface; 6. Displacement sensor. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1
[0017] like Figures 1 to 4 As shown, the utility model discloses a novel displacement detection mechanism of a wire-controlled steering actuator, and the technical solution adopted is as follows: comprising a housing 1, wherein the housing 1 has a motor 2, the output shaft of the motor 2 is connected to a bidirectional screw 3, the housing 1 on both sides of the bidirectional screw 3 is internally connected to a core shaft 4 for rotation, and threaded sleeves 401 are provided at both ends of the core shaft 4, the core shaft 4 is connected to the bidirectional screw 3 through the threaded sleeves 401 and is threadedly slidably connected, a limiting groove 101 is provided on the housing 1 above the core shaft 4, screw holes are provided at the four corners of the limiting groove 101, a threaded hole 402 is provided on the core shaft 4 inside the limiting groove 101, and a threaded hole 402 is provided on the threaded hole 402 There is a sensing block 5, which is fixed to the core shaft 4 by a bolt 501 and the threaded hole 402. The top of the sensing block 5 is an arc sensing surface 502, and the center of the arc sensing surface 502 coincides with the center of the core shaft 4. A displacement sensor 6 is provided above the limiting groove 101. A through hole is provided at the corresponding position of the displacement sensor 6 and the screw hole at the top of the limiting groove 101. The displacement sensor 6 is fastened to the screw hole by a screw penetrating the through hole, thereby being fixed to the limiting groove 101. There is an induction coil inside the displacement sensor 6, and the induction coil can sense the moving position of the arc sensing surface 502.
[0018] The working principle of the present invention is as follows: when the motor 2 rotates to drive the core shaft 4 to move left and right, the sensing block 5 will move left and right along with the core shaft 4. When the core shaft 4 moves, a torsional torque will be generated to rotate, and the sensing block 5 will twist synchronously with the core shaft 4. Since the sensing block 5 has an arc sensing surface 502, no matter what angle the sensing block 5 is at, the distance between the sensing block 5 and the displacement sensor 6 does not change, thereby ensuring that the displacement sensor 6 can make a more accurate judgment on the position of the sensing block 5.
[0019] The circuits and mechanical connections involved in the present invention are conventional means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and they belong to common knowledge.
[0020] Components not described in detail herein are prior art.
[0021] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A novel displacement detection mechanism for a wire-controlled steering actuator, comprising a housing (1), a motor (2) in the middle of the housing (1), an output shaft of the motor (2) connected to a bidirectional lead screw (3), a core shaft (4) rotatably connected inside the housing (1) on both sides of the bidirectional lead screw (3), threaded sleeves (401) provided on both sides of the core shaft (4), the core shaft (4) meshing with the bidirectional lead screw (3) through the threaded sleeves (401), a limiting groove (101) provided on the housing (1) above the core shaft (4), a displacement sensor (6) detachably connected to the limiting groove (101), a sensing block (5) on the core shaft (4) inside the limiting groove (101), a top of the sensing block (5) being an arc-shaped arc sensing surface (502), the center of the arc sensing surface (502) coinciding with the center of the core shaft (4).
2. The novel displacement detection mechanism of the steer-by-wire actuator according to claim 1, characterized in that: The displacement sensor (6) has an induction coil inside.
3. The displacement detection mechanism of the novel steer-by-wire actuator according to claim 1 is characterized in that: A threaded hole (402) is provided on the core shaft (4) inside the limiting groove (101), and the sensing block (5) is fixed to the core shaft (4) via the threaded hole and the bolt (501).
4. The novel displacement detection mechanism of the steer-by-wire actuator according to claim 1, characterized in that: Through holes are provided at the four corners of the displacement sensor (6), threads are provided at positions relative to the limiting groove (101), and the displacement sensor (6) is fixed to the limiting groove (101) by screws passing through the through holes.