CN217761817U

CN217761817U - Brake caliper

Info

Publication number: CN217761817U
Application number: CN202222303249.2U
Authority: CN
Inventors: 朱元澄; 宣明; 李运动; 郭锋亮
Original assignee: Wuhu Bethel Automotive Safety Systems Co Ltd
Current assignee: Wuhu Bethel Automotive Safety Systems Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-08
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a brake caliper, including the brake caliper body and ball are vice, ball is vice including lead screw, steel ball and nut, brake caliper still includes stop gear, stop gear including set up in spacing muscle on the nut with set up in on the lead screw and cooperate with spacing muscle and carry out spacing boss. The brake calipers of the utility model are provided with the limiting mechanisms formed by the matching of the limiting ribs and the limiting bosses; when the nut returns to the zero position, the limiting structure prevents the torque from being converted to the axial force, and the steel ball is prevented from being subjected to additional axial force to lose efficacy, so that the ball screw pair is effectively protected, and the safety performance is improved.

Description

Brake caliper

Technical Field

The utility model belongs to the technical field of braking system, specifically speaking, the utility model relates to a brake caliper.

Background

The traditional hydraulic caliper has to be provided with a piston structure to convert hydraulic pressure into thrust, and for an electric control brake dry caliper, a hydraulic brake mode is cancelled, electric drive is completely adopted, and an inner brake pad can be directly pushed through a ball screw pair, so that a brake function is realized.

In the prior art of electrically controlled brake calipers, a ball screw pair is composed of a screw, a nut and a bearing element (usually a steel ball), and taking the technical scheme disclosed in the patent document with publication number CN215097527U as an example, the ball screw pair has the following functions:

1. the motion conversion function is as follows: the ball screw pair consists of a screw, a nut and a bearing element (steel ball), and the motor rotates to drive the gear unit to convert the rotary motion of the screw into the linear motion of the nut.

2. And (3) sealing function: the outer wall of the nut is matched with the inner wall of the clamp body cylinder hole, and a mounting ring and a dust cover are arranged between the outer wall of the nut and the clamp body cylinder hole for sealing.

The technical solutions disclosed in the above patent documents have problems that:

a limit structure is lacked between the nut and the screw rod;

generally, a motion conversion mechanism of a traditional electronic parking caliper has a limit structure, when a brake pad is replaced, a piston needs to be retracted to determine that the returning position of a nut is at an initial position (zero position), so that a brand-new brake pad can be installed; aiming at the design of the existing electric control brake calipers, the difficulty of designing the limiting structure of the ball screw is very high, and the limitation of the space causes the abandonment of the limiting structure between the ball screw pairs in the industry. Lacking this kind of limit structure, when backing back to the end, the moment of impact can produce the axial force on ball, and this kind of axial force can extrude the steel ball, if limit structure, then can not extrude the steel ball.

In summary, the problem that automatically controlled brake caliper among the prior art exists is:

no limit structure is arranged between the nut and the screw, so that the nut is easy to continue to move upwards after returning to an initial position, and a ball screw pair is stuck; the steel ball can receive the axial force that the nut continues to shift up and produce, leads to the ball to receive extrusion deformation, damage or fracture to appear inefficacy in the ball pair.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a brake caliper, the purpose is to improve the security performance.

In order to realize the purpose, the utility model discloses the technical scheme who takes does: brake caliper, including the brake caliper body and ball vice, ball is vice including lead screw, steel ball and nut, brake caliper still includes stop gear, stop gear including set up in spacing muscle on the nut with set up in on the lead screw and cooperate with spacing muscle and carry out spacing boss.

The nut is of a cup-shaped structure, one end of the nut is open, the other end of the nut is closed, and the cross section of the nut is U-shaped.

The limiting rib is arranged on the inner wall surface of the nut, and the limiting boss is arranged at the end part of the lead screw.

At least one limiting mechanism is arranged.

The screw rod is provided with an outer raceway for accommodating steel balls, and the outer raceway is of a full raceway structure; the nut is provided with an inner raceway for accommodating the steel ball, and the inner raceway is a partial raceway.

The lead screw is of an integrated structure or a split structure.

The nut is provided with a return device.

Other parts are arranged in the lead screw, and the other parts are structural parts, sensors, bearings or planetary gear units.

The connection between the lead screw and the coupler is of a spherical pair structure.

The utility model discloses a brake caliper cooperatees the stop gear who forms through setting up by spacing muscle and spacing boss, and after the nut return arrived the zero-bit, stop gear prevented the torque to the axial force conversion, prevented that the steel ball from receiving extra axial force and appearing inefficacy to it is vice effectively to protect ball, improves the security performance.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is a schematic structural view of a brake caliper according to a first embodiment;

FIG. 2 is a schematic structural diagram illustrating the function of a limiting boss in the first embodiment;

FIG. 3 is a cross-sectional view of the nut;

labeled in the figure as:

1. an actuator; 2. a brake caliper body; 2a, an anti-rotation groove; 3. a coupling; 4. a lead screw; 4a, a limiting boss; 5. a nut; 5a, a side wall boss; 5b, limiting ribs; 6. other parts; 7. a hole retainer ring; 8. a seal ring; 9. a dust cover.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.

The utility model mainly provides an automatically controlled brake caliper, the primary structure includes executor 1, the brake caliper body 2, ball is vice, executor 1's output shaft passes through splined connection with shaft coupling 3, form the vice contact of sphere between shaft coupling 3 and the lead screw 4, be equipped with transmission torque structure before shaft coupling 3 and the lead screw 4, the motor passes through power transmission mechanism and turns into the rotary motion of lead screw 4 nut 5's linear motion, produce thrust, promote the tight brake disc of braking piece clamp, realize brake function.

The electric control brake caliper has the following advantages:

1. the safety performance is high;

in the utility model, the bottom of the inner wall of the nut 5 of the ball screw pair is designed with a limit rib 5b, the bottom of the screw 4 of the ball screw pair is designed with a limit boss 4a, the limit boss 4a of the screw 4 is matched with the limit rib 5b of the nut 5 (at the moment, the zero position) for limiting the excessive return of the nut 5, and the axial force to the steel ball caused by the excessive return of the nut 5 is eliminated, so that the steel ball is not easy to deform and break to cause the jamming or failure of the ball screw pair;

in addition, in assembly of production line, inefficacy maintenance process, limit structure also can effectively guarantee that vice nut 5 of ball can return initial position (zero position), reduces the steel ball and receives extra axial force because of nut 5 excessively returns, has further guaranteed vice security of ball.

2. The sealing performance is ensured, and the space is more compact;

in the utility model, the nut 5 of the ball screw is used by the piston structure of the traditional electronic parking caliper, and the sealing ring or the annular sliding bearing and the dust cover which are originally mature structures can be normally used in the electric braking caliper of the utility model, and the sealing performance is well ensured; in addition, other parts such as structural parts, sensors, bearings and planetary gear units can be accommodated in the screw with the U-shaped section, so that the space of the ball screw pair is effectively utilized, and the ball screw pair integrates the functions of good sealing performance and more compact space.

Through the structure, the utility model discloses in the vice design of novel ball, can reduce nut 5 effectively and make the steel ball take place to warp, break because of excessive return, lead to ball vice the risk that the card is dead, became invalid to appear, simultaneously, integrated the security performance height, sealing performance is outstanding, advantages such as space compactness.

The following description is given with reference to specific embodiments:

example (b):

as shown in fig. 1, the present embodiment provides a brake caliper, which includes an actuator 1, an inner brake pad, an outer brake pad, a brake caliper body 2, a ball screw pair and a limiting mechanism, where the ball screw pair at least includes a screw 4, a steel ball and a nut 5. The nut 5, the lead screw 4 and the steel ball form a ball screw pair, the nut 5 moves linearly along the axial direction, the lead screw 4 rotates, and the nut 5 and the lead screw 4 are positioned in a cylinder hole of the brake caliper body 2. The inner brake block and the outer brake block are positioned at two opposite sides of the brake disc, and the nut 5 is used for pushing the inner brake block to move towards the brake disc when braking. Stop gear is including setting up spacing muscle 5b on nut 5 and setting up on lead screw 4 and cooperate with spacing muscle 5b and carry out spacing boss 4a, and spacing boss 4a and spacing muscle 5b contact the back, and nut 5 stops to remove. Spacing muscle 5b sets up on the internal face of nut 5, and spacing boss 4a sets up in lead screw 4's tip, and spacing muscle 5b bulges in the interior cavity towards nut 5, and spacing boss 4a bulges towards the 4 tip outsides of lead screw.

As shown in fig. 1, the actuator 1 is disposed on the caliper body 2, the actuator 1 is used for driving the lead screw 4 to rotate, and the actuator 1 at least includes a motor and a speed reducing mechanism. The construction of the actuator 1 is as such well known to the person skilled in the art and will not be described in further detail here.

As shown in fig. 1 and 2, the caliper body 2 is of an integral structure, the caliper body 2 has a cylinder hole structure, an anti-rotation groove 2a in a circular arc shape is formed in an inner wall of the cylinder hole, a side wall boss 5a is disposed on an outer wall of the nut 5, and the anti-rotation groove 2a is matched with the side wall boss 5a to limit rotation of the nut 5. The inner wall of the nut 5 is provided with a groove for accommodating the retainer ring 7 for the hole, and the axial displacement of the coupler 3 is limited.

As shown in fig. 1, the screw 4 is provided with an outer raceway for accommodating steel balls, the outer raceway is of a full raceway structure, and the outer raceway extends on the outer wall of the screw 4 along the entire axial direction of the screw 4. The inner wall of the nut 5 is provided with an inner raceway for accommodating the steel ball, and the inner raceway is a partial raceway. In the embodiment of the scheme, the nut 5 is cup-shaped, one end of the nut is open, the other end of the nut is closed, and the cross section of the nut 5 is U-shaped. The lead screw 4 is of a U-shaped structure, other parts 6 can be accommodated inside the lead screw 4, and the other parts 6 are sensors, bearings or planetary gear units. The bottom surface tip of lead screw 4 sets up spacing boss 4a, and the inner wall bottom of nut 5 sets up spacing muscle 5b, thereby spacing boss 4a reaches the purpose that continues to shift up behind the initial position reached with spacing muscle 5b mutual contact cooperation. The position where the limiting boss 4a is in contact fit with the limiting rib 5b is a zero position. In addition, under production line assembly, inefficacy maintenance state, limit structure can effectively protect ball screw pair's nut 5 return to initial position, and restriction nut 5 continues upwards translation to make the steel ball receive extra axial force and lead to ball screw pair to appear the risk of blocking, losing efficacy.

The ball screw pair is usually composed of a nut 5 provided with an inner raceway, a screw 4 provided with an outer raceway and a steel ball, the raceway of the screw 4 is designed on the outer side and is of a full raceway structure, the raceway of the nut 5 is designed on the inner wall and is of a partial raceway structure, the diameter of the contact point of the raceway of the screw 4 and the steel ball is smaller than that of the contact point of the raceway of the nut 5 and the steel ball, the number of rotation turns of the steel ball around the nut 5 is small, the effective length of the steel ball running in the raceway is reduced, and the bearing capacity of the ball screw pair is balanced. The screw rod 4 is of a U-shaped structure, and other parts 6 (such as a structural part, a sensor, a bearing, a planetary gear unit and the like) can be arranged in the screw rod 4, so that the space utilization rate is effectively improved, and the structural compactness is ensured;

the nut 5 is of a piston structure of the traditional electronic parking technology, at least one sealing ring 8 and a dust cover 9 are arranged between the nut 5 and the brake caliper body 2, the sealing ring 8 is tightly matched with the outer side of the nut 5 and the inner wall of a brake caliper cylinder hole, and the sealing performance between the nut 5 and the brake caliper body 2 is guaranteed. In the embodiment, the sealing structure between the ball screw pair and the brake caliper body 2 adopts the mature sealing technology of the existing electronic parking brake caliper assembly, and the sealing performance is effectively ensured.

In the prior art, a steel ball in a ball screw pair circularly rolls in a raceway, and a mature scheme is to install a reverser to enable the steel ball to circulate. As shown in fig. 3, a case where the separate type reverser is disposed in the nut 5. The ball screw pair is provided with a plurality of circles of circulating steel balls, for convenience of expression, only one circle of steel balls is shown in fig. 3, the side wall of the nut 5 is provided with through holes which are located between adjacent threaded roller paths, the reverser is installed in the through holes on the nut 5, the reverser is provided with a ball returning groove, and the ball returning groove is connected with the adjacent threaded roller paths. When the ball rolls for a circle in the threaded raceway, the ball returns to the threaded raceway of the previous circle again through the ball returning groove, and the ball circulates in a reciprocating manner all the time in a partial raceway structure of the nut 5.

As shown in fig. 1, the screw 4 is connected with the power output end of the actuator 1 through the coupling 3, the actuator 1 drives the screw 4 to rotate through the coupling 3, one end of the coupling 3 is inserted into the inner cavity of the screw 4, the coupling 3 and the screw 4 are coaxially arranged, and the coupling 3 and the screw 4 synchronously rotate. The retainer ring 7 for holes realizes the axial relative fixation of the coupler 3 and the lead screw 4, and the retainer ring 7 for holes is used for fixing the lead screw 4 and the coupler 3 into movable connection.

As shown in fig. 1 and 2, the connection between the lead screw 4 and the coupling 3 is a spherical pair structure. The lead screw 4 is provided with a first contact surface, the coupler 3 is provided with a second contact surface, the first contact surface and the second contact surface are spherical surfaces, and the first contact surface is in contact with the second contact surface. The first contact surface is located the internal face of the spherical groove arranged at the center of the inner part of the screw rod 4, and the spherical center of the first contact surface is located on the axis of the screw rod 4. The second contact surface is the end surface of the end part of the coupling 3, and the spherical center of the second contact surface is positioned on the axis of the coupling 3.

The electronic control brake caliper has the following advantages:

1. the safety performance is high: under the assembly, failure maintenance and normal working conditions of a production line, the limiting structure can effectively protect the nut of the ball screw from returning to an initial position (zero position), and prevent the nut from continuously translating upwards to cause the risk of failure of the steel ball due to additional axial force;

2. mature sealing technology of the traditional brake is adopted: the sealing ring or the annular sliding bearing and the dust cover on the existing brake can be applied to the structure of the ball screw pair;

3. the space is kept compact: other parts can be arranged in the lead screw, such as a structural part, a bearing, a sensor, a planetary gear and the like;

4. the ball screw pair is reasonable in design: the reverser is arranged on the nut, the strength of a nut raceway is high, and the bearing capacity of the ball screw pair is balanced;

5. the loaded balance of the ball screw pair is as follows: the load unbalance of the ball screw after the deformation of the claw of the caliper can be prevented.

The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.

Claims

1. Brake caliper, including the brake caliper body and the ball is vice, the ball is vice including lead screw, steel ball and nut, its characterized in that: the brake caliper further comprises a limiting mechanism, and the limiting mechanism comprises a limiting rib arranged on the nut and a limiting boss arranged on the lead screw and matched with the limiting rib for limiting.

2. Brake calliper according to claim 1, wherein: the nut is of a cup-shaped structure, one end of the nut is open, the other end of the nut is closed, and the cross section of the nut is U-shaped.

3. Brake calliper according to claim 1, wherein: the limiting ribs are arranged on the inner wall surface of the nut, and the limiting bosses are arranged at the end parts of the lead screws.

4. Brake calliper according to claim 1, wherein: at least one limiting mechanism is arranged.

5. Brake calliper according to any of claims 1 to 3, wherein: the lead screw is provided with an outer raceway for accommodating steel balls, and the outer raceway is of a full raceway structure; the nut is provided with an inner raceway for accommodating the steel ball, and the inner raceway is a partial raceway.

6. Brake calliper according to any of claims 1 to 3, wherein: the lead screw is of an integrated structure or a split structure.

7. Brake calliper according to any of claims 1 to 3, wherein: the nut is provided with a return device.

8. Brake calliper according to any of claims 1 to 3, wherein: other parts are arranged in the lead screw, and the other parts are structural parts, sensors, bearings or planetary gear units.

9. Brake calliper according to any of claims 1 to 3, wherein: the connection between the lead screw and the coupler is of a spherical pair structure.