CN-224229139-U - Ball screw pair anti-rotation mechanism based on involute guide rail embedding

Abstract

The utility model discloses a ball screw pair anti-rotation mechanism based on involute guide rail embedding, which comprises a valve block, wherein the valve block is connected with one end of an anti-rotation sleeve through a fastener, a nut is sleeved in the anti-rotation sleeve, the nut is uniformly provided with at least 2 sections of grooves on the outer cylindrical surface, a square key is arranged at the lower end of the involute guide rail, the square key is in transition fit with the grooves, the involute sleeve is provided with involute grooves with the number matched with that of the involute guide rail on the inner cylindrical surface, the involute grooves are in clearance fit with the upper end of the involute guide rail, the involute guide rail is used for preventing the nut from rotating, and the nut is connected with a screw rod through threads.

Inventors

• LI YINGZHE
• LIU SUPING
• CHEN JIE
• Qiu Youshan
• YUAN JINGJIE

Assignees

• 海孚威(苏州)汽车科技有限公司

Dates

Publication Date

20260512

Application Date

20250514

Claims (9)

1. 1. The utility model provides a ball screw pair prevents changeing mechanism based on involute guide rail is pre-buried, its characterized in that, includes the valve piece, the valve piece passes through the fastener with prevent changeing telescopic one end and is connected, the nut embolias prevent changeing in the sleeve, the nut evenly sets up the recess of no less than 2 sections at outer cylinder, and involute guide rail's lower extreme is equipped with square key, square key and recess adoption transition fit, prevent changeing the sleeve and dispose involute recess that quantity and involute guide rail number match at inboard cylinder, involute recess and involute guide rail's upper end clearance fit, involute guide rail is used for preventing the rotation of nut, nut and lead screw pass through threaded connection.
2. 2. The anti-rotation mechanism of the ball screw pair based on the involute guide rail embedding of claim 1, wherein blind structures are arranged at two ends of the groove and used for blocking the involute guide rail from penetrating in the axial direction of the groove in a bidirectional manner to play a limiting role.
3. 3. The anti-rotation mechanism of the ball screw pair based on the involute guide rail embedding of claim 1, wherein a tangential step surface is arranged on the outer side of the groove, and a convex part is arranged on the tangential step surface and is used for fixing the involute guide rail in the groove to complete rigid connection.
4. 4. The anti-rotation mechanism of the ball screw pair based on the involute guide rail embedded in the invention of claim 1, wherein the inner wall of the screw is provided with an internal thread, the internal thread is tightly connected with a spiral raceway of the screw, and the ball rolls between the internal thread of the screw and an external spiral raceway of the screw, so that the screw drives the screw to rotate through rolling friction force, and power transmission is realized.
5. 5. The anti-rotation mechanism of the ball screw pair based on the involute guide rail embedded in the involute guide rail according to claim 1, wherein the grooves of the anti-rotation sleeve are arranged in a blind structure on the outer side, so that the anti-rotation sleeve has a limiting effect and can avoid the failure that a nut collides with a cylinder bottom.
6. 6. The ball screw pair anti-rotation mechanism based on involute guide rail embedding of claim 1, wherein one end of the anti-rotation sleeve is provided with petal-shaped flanges which are uniformly distributed and are in clamping fit with petal-shaped flange notches on the side surfaces of the valve blocks.
7. 7. The involute guide rail embedded-based ball screw pair anti-rotation mechanism according to claim 1, wherein the fastener is a rivet, the outer diameter of the rivet is provided with a rubber sheath, and the two are in clearance fit.
8. 8. The involute guide rail embedded ball screw pair rotation preventing mechanism according to claim 7, wherein the rivets respectively penetrate through the installation through holes of the rotation preventing sleeve and then are pressed into the blind holes of the valve block, so that the rotation preventing sleeve is fixedly connected with the valve block.
9. 9. The anti-rotation mechanism of the ball screw pair based on the involute guide rail embedded in the anti-rotation sleeve according to claim 1, wherein the involute guide rail is in involute surface contact with a groove of the anti-rotation sleeve and is used for converting rotary motion of a screw rod into linear motion of a screw nut.

Description

Ball screw pair anti-rotation mechanism based on involute guide rail embedding Technical Field The utility model relates to a ball screw pair anti-rotation mechanism based on involute guide rail embedding, in particular to the technical field of automobile linear control and braking. Background In an automobile brake-by-wire system, a ball screw is used as a core transmission component, and the performance quality of the ball screw directly influences the brake response speed, the brake response precision and the brake reliability. However, there are many industry pain points to be solved in the ball screw anti-rotation mechanism adopted by the conventional brake-by-wire system: The response delay is that a small gap exists in the traditional anti-rotation structure, so that the response delay (about 15-20 ms) is caused in the initial stage of braking, the delay seriously influences the triggering timeliness of an AEB (automatic emergency braking) system, and potential threats are formed on driving safety. The thermal stability is poor, when the system temperature rises to more than 120 ℃ in the frequent braking process, the traditional plastic guide piece is easy to deform, and the nylon guide piece is taken as an example, the real measurement deformation amount of the nylon guide piece can reach 0.3mm, so that the guide precision is reduced, and the braking performance is further influenced. The space limitation is that the installation space of the automobile chassis is harsh, the axial space occupied by the traditional anti-rotation structure is larger, the axial space is usually more than or equal to 25mm, the design boundary of the EMA module is exceeded, and great difficulty is brought to the integration and layout of the system. The durability problem is that the number of times of annual average braking under urban working conditions exceeds 50 ten thousand times, and the abrasion condition of the existing anti-rotation structure is very serious. The actual measurement data show that the wear depth of the guide grooves exceeds the tolerance of 50 μm, which not only reduces the service life of the mechanism, but also affects the stability of the brake system. Disclosure of utility model The utility model provides a ball screw pair anti-rotation mechanism based on involute guide rail embedding, which is used for overcoming the defects of response delay, thermal deformation and cylinder collision of an anti-rotation mechanism in a linear control brake system in the prior art. In order to solve the technical problems, the utility model provides the following technical scheme: The utility model discloses a ball screw pair anti-rotation mechanism based on involute guide rail embedding, which comprises a valve block, wherein the valve block is connected with one end of an anti-rotation sleeve through a fastener, a nut is sleeved in the anti-rotation sleeve, at least 2 sections of grooves are uniformly formed in the outer cylindrical surface of the nut, square keys are arranged at the lower end of the involute guide rail, the square keys are in transition fit with the grooves, the anti-rotation sleeve is provided with involute grooves, the number of which is matched with the number of the involute guide rails, on the inner cylindrical surface of the involute sleeve, the involute grooves are in clearance fit with the upper end of the involute guide rail, the involute guide rail is used for preventing the nut from rotating, and the nut is internally connected with a screw rod through threads. Further, blind blocking structures are arranged at the two ends of the groove and used for blocking the involute guide rail from penetrating in the axial direction of the groove in a two-way mode, and the limit effect is achieved. Further, a tangential step surface is arranged on the outer side of the groove, and a convex part is arranged on the tangential step surface and used for fixing the involute guide rail in the groove to finish rigid connection. Further, the inner wall of the screw is provided with an internal thread, the internal thread is tightly connected with the spiral rollaway nest of the screw, and the ball rolls on the internal thread of the screw and the outer spiral rollaway nest of the screw, so that the screw drives the screw to rotate through rolling friction force, and power transmission is realized. Further, the groove of the anti-rotation sleeve is arranged to be a blind plug structure at the outer side, so that the limiting effect is achieved, and the phenomenon that the nut bumps against the cylinder bottom is avoided. Further, one end of the anti-rotation sleeve is provided with petal-shaped flanges which are uniformly distributed and are matched with petal-shaped flange notches on the side face of the valve block in a clamping manner. Further, the fastener is a rivet, the outer diameter of the rivet is provided with a rubber sheath, and the rivet and the rubber sheath are in clearance fit. Fu