CN-121990051-A - Anti-rotation sensor device for rear-wheel steering gear

Abstract

The invention discloses an anti-rotation sensor device for a rear wheel steering device, which comprises a shell, a connecting shaft, an anti-rotation mechanism and a sensor unit, wherein the anti-rotation mechanism comprises at least two split sliding blocks, a fusiform cylindrical structure and a screw, the fusiform cylindrical structure is arranged on the connecting shaft in a mode of being incapable of rotating relatively through the screw, the fusiform cylindrical structure is in fit connection with the split sliding blocks, the sensor unit is fixed at the top of the screw, the fusiform cylindrical structure comprises a conical area, a cylindrical area and a circular groove, a profiling nest matched with the fusiform cylindrical structure is arranged in the split sliding blocks, and an elastic element is arranged in the circular groove and used for adjustably expanding the split sliding blocks. The anti-rotation mechanism only releases the axial freedom degree of the rack, integrates the anti-rotation mechanism and the sensor unit, saves space and improves the precision of the sensor unit.

Inventors

• CHEN HAIMING
• XING YULONG
• XU YANGPENG

Assignees

• 博世华域转向系统有限公司

Dates

Publication Date

20260508

Application Date

20260331

Claims (11)

1. 1. An anti-rotation sensor device for a rear wheel steering apparatus, characterized by comprising a housing, a connecting shaft, an anti-rotation mechanism, and a sensor unit; the anti-rotation mechanism comprises at least two split sliding blocks, a fusiform cylindrical structure and screws; The spindle-shaped cylindrical structure is arranged on the connecting shaft through a screw, and the spindle-shaped cylindrical structure is connected with the split sliding block in a fitting way; the fusiform cylindrical structure comprises a conical area, a cylindrical area and a circular groove, wherein a profiling nest matched with the fusiform cylindrical structure is arranged in the split sliding block, and an elastic element is arranged in the circular groove and used for adjustably expanding the split sliding block.
2. 2. The anti-rotation sensor device according to claim 1, wherein a bracket for fixing the sensor unit is arranged at the top of the screw, the bracket is provided with a slotted elastic thread buckle, and the sensor unit is connected with the screw in a complementary snap fit manner through the slotted elastic thread buckle.
3. 3. The anti-rotation sensor device according to claim 2, wherein the bracket is provided with a locking protrusion, the outer surface of the split slider is provided with a locking groove, and the bracket is fixed with the split slider in a matching manner through the locking protrusion.
4. 4. The anti-rotation sensor device according to claim 2, wherein the bracket is provided with a locking protrusion, the housing is internally provided with a guide groove, and the bracket is fixed with the guide groove in a matching way through the locking protrusion.
5. 5. The anti-rotation sensor device according to claim 1, characterized in that the spindle-shaped cylindrical structure is arranged in a non-rotatable manner on the connection shaft by means of screws.
6. 6. The anti-rotation sensor device of claim 5, wherein the connecting shaft is provided with a circular arc concave surface, and the circular arc concave surface prevents the spindle-shaped cylindrical structure from rotating relative to the connecting shaft after being fixed.
7. 7. The anti-rotation sensor assembly of claim 6, wherein the cylindrical region conforms to the arcuate concave surface of the connecting shaft after the shuttle-shaped cylindrical structure is secured.
8. 8. The anti-rotation sensor device of claim 2, wherein the number of slotted elastic threaded snaps is 5 to 8 and the number of snaps complementary to the interior of the screw is 4 to 7.
9. 9. The anti-rotation sensor device according to claim 1, wherein the split slider is provided with a circular boss and a cylindrical groove on an outer surface.
10. 10. The anti-rotation sensor device of claim 1, wherein the split slider is a PEEK material.
11. 11. The anti-rotation sensor arrangement of claim 1, wherein the resilient element is an O-ring.

Description

Anti-rotation sensor device for rear-wheel steering gear Technical Field The invention relates to the technical field of automobile steering, in particular to an anti-rotation sensor device for a rear wheel steering device. Background The connecting shaft generates certain circumferential force along with the screw rod in the steering of the rear wheel, so that the connecting shaft moves circumferentially, and the stroke induction and the axial displacement of the displacement sensor are affected. The anti-rotation sensor device of the rear-wheel steering gear is therefore designed to limit the number of degrees of freedom other than the number of degrees of freedom of the circumferential movement of the connecting shaft (only a slight swing in this direction is allowed). At the same time, the measuring precision of the sensor and the noise reduction problem should be ensured as much as possible. The square structure of the anti-rotation sensor device in the steering of the rear wheels known from the prior art ideally completely limits the rotation, but due to tolerance factors, the rotation cannot be limited, but actually only 2 degrees of freedom are limited. Although tolerance factors can be eliminated by the spherical hinge structure, only 3 degrees of freedom are limited, and radial swinging of the connecting shaft still exists, so that the precision of the sensing unit is easily influenced. And the current anti-rotation mechanism and induction mechanism parts are numerous, the process is numerous, the tolerance is made, and the like, the anti-rotation mechanism and the shell guide groove are easy to have gaps, the phenomenon of blocking and eccentric wear occurs, and the noise is reduced. Disclosure of Invention The invention aims to realize that the anti-rotation mechanism only releases the axial freedom degree of the rack, the sensor unit is arranged on the screw, the anti-rotation mechanism and the sensor unit are integrated, the space is saved, the precision of the sensor unit is improved, the gap between the split sliding block and the shell is eliminated by adding the elastic element in the axial direction of the spindle-shaped structure, the blocking and eccentric wear phenomena of the sliding block and the shell are reduced, and the noise problem is reduced. In order to solve the technical problems, the invention provides an anti-rotation sensor device for a rear wheel steering gear, which comprises a shell, a connecting shaft, an anti-rotation mechanism and a sensor unit; the anti-rotation mechanism comprises at least two split sliding blocks, a fusiform cylindrical structure and screws; The spindle-shaped cylindrical structure is arranged on the connecting shaft through a screw, and the spindle-shaped cylindrical structure is connected with the split sliding block in a fitting way; the fusiform cylindrical structure comprises a conical area, a cylindrical area and a circular groove, wherein a profiling nest matched with the fusiform cylindrical structure is arranged in the split sliding block, and an elastic element is arranged in the circular groove and used for adjustably expanding the split sliding block. Preferably, the top of the screw is provided with a bracket for fixing the sensor unit, the bracket is provided with a slotted elastic thread buckle, and the sensor unit is connected with the complementary buckle inside the screw in a matching way through the slotted elastic thread buckle. Preferably, the bracket is provided with a latch, a latch groove is arranged on the outer surface of the split sliding block, and the bracket is matched and fixed with the split sliding block through a latch protrusion. Preferably, the bracket is provided with a locking protrusion, a guide groove is arranged in the shell, and the bracket is fixed with the guide groove in a matched manner through the locking protrusion. Preferably, the spindle-shaped cylindrical structure is arranged on the connecting shaft in a rotationally fixed manner by means of screws. Preferably, the connecting shaft is provided with an arc concave surface, and the arc concave surface enables the fusiform cylindrical structure to be unable to rotate relative to the connecting shaft after being fixed. Preferably, after the fusiform cylindrical structure is fixed, the cylindrical area is attached to the arc concave surface of the connecting shaft. Preferably, the number of the slotted elastic thread buckles is 5 to 8, and the number of the buckles complementary to the inner part of the screw is 4 to 7. Preferably, the outer surface of the split sliding block is provided with a circular convex column and a cylindrical groove. Preferably, the split sliding block is made of PEEK material. Preferably, the elastic element is an O-ring. Compared with the prior art, the invention has at least the following advantages and beneficial effects: 1. The invention perfectly realizes the limitation of the radial circular motion of the anti-rotatio