CN116006597A

CN116006597A - Electrohydraulic composite brake caliper

Info

Publication number: CN116006597A
Application number: CN202211555341.6A
Authority: CN
Inventors: 范芳; 王丽; 余东; 郑世界; 周亭亭; 彭博; 罗钰华
Original assignee: Chengdu Vocational and Technical College of Industry
Current assignee: Chengdu Vocational and Technical College of Industry
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-04-25

Abstract

The invention provides an electrohydraulic composite brake caliper, which comprises a shell, two brake friction plates symmetrically arranged in the shell, and a braking force driving mechanism for pushing the two brake friction plates to move towards the direction of approaching each other, wherein the braking force driving mechanism comprises a mounting seat for fixing the brake friction plates, a driving part for driving wedge blocks to move towards the direction of approaching the brake friction plates, and a wedge block arranged on the side surface of the mounting seat; when the driving part pushes the wedge block, the outer inclined surface of the wedge block is contacted with the inner inclined surface of the mounting seat, and the two braking friction plates can move towards the directions close to each other at the same time. By using the electrohydraulic composite brake caliper, on one hand, brake pads on two sides of a brake disc can be simultaneously contacted with the brake disc, and symmetrical braking force is provided. On the other hand, the hydraulic driving device and the electric signal driving device are respectively arranged on two radial sides of the brake disc, so that the axial space of the brake disc is not excessively occupied, and the hydraulic driving device and the electric signal driving device can be suitable for small-sized tires.

Description

Electrohydraulic composite brake caliper

Technical Field

The invention relates to the technical field of vehicle braking, in particular to an electrohydraulic composite brake caliper.

Background

Most of the prior art vehicle brake calipers adopt floating calipers, each calipers consists of a bracket and a caliper body, the caliper body can slightly slide on the bracket, a piston is arranged on one side of each caliper, a brake pad is arranged on the other side of each caliper, when braking, the pressure in a cylinder pushes the piston, the brake pad on one side of the piston cylinder is firstly contacted with a brake disc, and then the whole caliper body can reversely force under the action of hydraulic pressure, so that the brake pad on the other side is contacted with the disc.

The existing floating calipers have the problem that a brake pad on one side of a piston cylinder firstly contacts a brake disc, and the brake pad on the other side can be contacted with the brake disc only after the piston is pushed continuously.

The brake pads on the two sides of the floating caliper have no synchronization, so that certain time delay exists in the braking action, and the braking force of the caliper is asymmetric, so that the braking effect is affected.

On the other hand, the existing part of brake calipers are mainly braked by an electromechanical braking system, and a conventional hydraulic braking system which is independently controlled is further arranged, so that the vehicle can be braked by the conventional hydraulic braking system even if the electromechanical braking system fails, and the reliability of braking can be improved.

The patent application with publication number CN112727950a discloses an electrohydraulic composite brake-by-wire system with redundant function, both the electromechanical brake system and the conventional hydraulic brake system are arranged on one side of the brake disc, the electromechanical brake system and the conventional hydraulic brake system are axially arranged along the brake disc, such arrangement results in a large volume of the brake system, and occupies the space on the side surface of the brake pad, which may not be applicable to tires with small volume and small width. The existing composite braking system consisting of the electromechanical braking system and the conventional hydraulic braking system is large in size and cannot be suitable for tires with small size and small width.

Disclosure of Invention

The invention aims to provide an electrohydraulic composite brake caliper, wherein brake pads on two sides of a brake disc can simultaneously contact the brake disc, and symmetrical braking force is provided.

The invention relates to an electrohydraulic composite brake caliper, which comprises a shell, two brake friction plates symmetrically arranged in the shell, and a braking force driving mechanism for pushing the two brake friction plates to move towards the direction of approaching each other, wherein the braking force driving mechanism comprises a mounting seat for fixing the brake friction plates, a driving part for driving wedge blocks to move towards the direction of approaching the brake friction plates, and a wedge block arranged on the side surface of the mounting seat;

the back surfaces of the two braking friction plates are respectively provided with a mounting seat, the side surface of the mounting seat, which is far away from the braking friction plates, is provided with an inner inclined surface, and the wedge-shaped block is provided with an outer inclined surface matched with the inner inclined surfaces of the mounting seats at the two sides;

when the driving part pushes the wedge block, the outer inclined surface of the wedge block is contacted with the inner inclined surface of the mounting seat, and the two braking friction plates can move towards the directions close to each other at the same time.

Preferably, the driving part comprises a hydraulic driving device and an electric signal driving device;

the hydraulic driving device comprises a hollow hydraulic driving cylinder, two ends of the hydraulic driving cylinder are respectively provided with a driving liquid input port and a first driving liquid output port, the driving liquid input port is used for inputting a hydraulic signal for controlling the action of the braking friction plate through hydraulic pressure, and the first driving liquid output port is used for outputting liquid pressure so as to drive the wedge-shaped block to move towards the direction close to the braking friction plate;

the electric signal driving device comprises a hollow electric driving cylinder, two ends of the electric driving cylinder are respectively provided with an electric signal executing device and a second driving liquid output port, the electric signal executing device is used for executing actions of raising the liquid pressure in the electric driving cylinder by corresponding electric signals, and the second driving liquid output port is used for outputting the liquid pressure so as to drive the wedge-shaped block to move towards the direction close to the braking friction plate.

Preferably, symmetrical inner inclined planes are arranged at two ends of the mounting seat, and the braking force driving mechanism comprises two symmetrically arranged wedge-shaped blocks, wherein the outer inclined planes of the two wedge-shaped blocks are symmetrically and oppositely arranged;

the driving part can push one or more wedge blocks of the two wedge blocks to move towards the direction approaching to the brake friction plate.

Preferably, the tail parts of the two wedge blocks are respectively provided with a hydraulic cylinder, and each hydraulic cylinder comprises a hollow first cavity, a first piston arranged in the first cavity, a connecting rod for connecting the first piston with the tail parts of the wedge blocks, and a liquid inlet and a liquid outlet arranged at two sides of the first piston;

the liquid inlets of the two hydraulic cylinders are communicated with each other and the driving part through the liquid pipeline, and the driving part can output liquid pressure to the liquid inlets of the two hydraulic cylinders at the same time.

Preferably, the hydraulic driving device and the electric signal driving device are respectively arranged at the tail parts of the two hydraulic cylinders;

the liquid inlets of the two hydraulic cylinders are respectively provided with a three-way connecting piece, and the three-way connecting pieces are respectively connected with the liquid inlets of the two hydraulic cylinders and the first driving liquid output port of the hydraulic driving device or the second driving liquid output port of the electric signal driving device.

Preferably, a reset spring piece is arranged between the two wedge blocks, a bending part is arranged on the reset spring piece, and the bending part bends towards the direction close to the brake friction plate;

when the driving part pushes the two wedge blocks to move, the two braking friction plates are mutually close and contacted with the arched part, and squeeze the bending part, so that the bending part is deformed; after the driving part releases the wedge-shaped block, the bending part is contacted with the brake friction plate, and the bending part is deformed and recovered to push the brake friction plate to move in a direction away from the other brake friction plate.

Preferably, two bending parts are arranged in the length direction of the reset elastic piece, an arch part is arranged between the two bending parts, and the arch direction of the arch part is opposite to the bending direction of the bending part.

Preferably, a second piston, an air hole penetrating through the electric driving cylinder and an electromagnet are arranged in the electric driving cylinder, and the air hole and the second driving liquid output port are respectively arranged at two sides of the second piston;

a second spring is arranged between the second piston and the inner wall of the electric driving cylinder, a magnetic part is arranged on the second piston, and the electromagnet can push the second piston to move through the magnetic part.

Preferably, the hydraulic driving cylinder is provided with a third piston and a third spring arranged between the third piston and the inner wall of the hydraulic driving cylinder;

the driving liquid input port and the first driving liquid output port are respectively arranged at two sides of the third piston, and a first limiting block is arranged at the end part, close to the driving liquid input port, in the hydraulic driving cylinder.

Preferably, the tail parts in the two hydraulic cylinders are respectively provided with a second limiting block; the shell is provided with a mounting hole.

According to the embodiment of the invention, the electrohydraulic composite brake caliper is provided, and on one hand, brake pads on two sides of a brake disc can simultaneously contact the brake disc to provide symmetrical braking force. On the other hand, the hydraulic driving device and the electric signal driving device are respectively arranged on two radial sides of the brake disc, so that the axial space of the brake disc is not excessively occupied, and the hydraulic driving device and the electric signal driving device can be suitable for small-sized tires.

Drawings

The disclosure includes the accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate various exemplary embodiments, features and aspects of the disclosure and together with the description, serve to explain the principles of the disclosure. The present invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings. Wherein:

FIG. 1 is a schematic illustration of the components and connection of an electro-hydraulic composite brake caliper according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an electro-hydraulic composite brake caliper according to an embodiment of the present invention;

FIG. 3 is a bottom view of an electro-hydraulic composite brake caliper according to an embodiment of the present invention;

FIG. 4 is an enlarged partial view of a hydraulic drive of an electro-hydraulic composite brake caliper in accordance with an embodiment of the present invention;

FIG. 5 is an enlarged partial view of an electrical signal driving device of the electro-hydraulic composite brake caliper in accordance with an embodiment of the present invention;

FIG. 6 is a top view of an electro-hydraulic composite brake caliper according to an embodiment of the present invention.

Detailed Description

The technical scheme of the present invention will be described in further detail below by way of examples with reference to the accompanying drawings, but the present invention is not limited to the following examples.

Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The existing floating calipers have the problem that the brake pads on one side of a piston cylinder firstly contact the brake disc 4, and the brake pads on the other side can be contacted with the brake disc only after the piston is pushed continuously.

The electromechanical braking system and the conventional hydraulic braking system in the existing brake-by-wire system are arranged on one side of the brake disc 4, and the electromechanical braking system and the conventional hydraulic braking system are axially arranged along the brake disc 4, so that the braking system is large in size and occupies the space on the side surface of a brake pad, and the tire with small size and width is possibly not suitable for the tire. The existing composite braking system consisting of the electromechanical braking system and the conventional hydraulic braking system is large in size and cannot be suitable for tires with small size and small width.

The invention aims to provide an electrohydraulic composite brake caliper, which comprises a shell 1, two brake friction plates 2 symmetrically arranged in the shell 1, and a braking force driving mechanism for pushing the two brake friction plates 2 to move towards each other, wherein the braking force driving mechanism comprises a mounting seat 21 for fixing the brake friction plates 2, a wedge block 3 arranged on the side surface of the mounting seat 21, and a driving part for pushing the wedge block 3 to move towards the direction of approaching the brake friction plates 2;

the back surfaces of the two braking friction plates 2 are respectively provided with a mounting seat 21, the side surface of the mounting seat 21, which is far away from the braking friction plates 2, is provided with an inner inclined surface, and the wedge-shaped block 3 is provided with an outer inclined surface matched with the inner inclined surfaces of the mounting seats 21 at the two sides;

when the driving part pushes the wedge block 3, the outer inclined surface of the wedge block 3 contacts with the inner inclined surface of the mounting seat 21, and the two brake friction plates 2 can move in the directions approaching each other at the same time.

In this embodiment, as shown in fig. 1 and 2, a brake friction plate 2 of an electrohydraulic composite brake caliper is disposed in a housing 1, and the brake friction plate 2 is fixedly connected with a mounting seat 21.

As shown in fig. 6, the space between the two brake pads 2 can be inserted into the brake disc 4, and when the brake caliper performs a braking operation, the two brake pads 2 simultaneously contact and press the brake disc 4 from both sides of the brake disc 4, and the brake disc 4 is prevented from rotating by friction force, thereby achieving the purpose of braking.

One side surface of the mounting seat 21 is used for fixing the brake friction plate 2, and the end part of the other side surface is provided with an outer inclined surface, so that the length of the side surface close to the brake friction plate 2 is longer than that of the side surface far from the brake friction plate 2.

The wedge block 3 is arranged on the side face of the mounting seat 21, an inner inclined face parallel to the outer inclined face is arranged on the contact part of the wedge block 3 and the mounting seat 21, and when the wedge block 3 moves towards the direction close to the brake disc, the outer inclined face of the wedge block 3 and the guiding action of the inner inclined faces of the two mounting seats 21 can enable the brake friction disc 2 to move towards the direction close to the brake disc 4 at the same time, so that braking action is executed.

According to the electrohydraulic composite brake caliper, the brake friction plates 2 on two sides of the brake disc 4 can simultaneously receive the thrust of the wedge-shaped blocks 3, so that the two brake friction plates 2 are simultaneously contacted with the brake disc 4.

As shown in fig. 3, edge portions 13 are provided on both sides in the width direction of the bottom of the housing 1, a gap is formed between the edge portions 13 on both sides, the brake disc 4 can enter the housing 1 through the gap, the mounting seat 21 is provided on the edge portions 13, and the protruding edge portions 13 of the brake friction plate 2 can be brought into contact with the brake disc 4. In the specific implementation, the housing 1 is fixedly connected to the frame of the vehicle, and the mounting structure and mounting components are not shown in the figures.

Further, the driving part comprises a hydraulic driving device 4 and an electric signal driving device 5;

the hydraulic driving device 4 comprises a hollow hydraulic driving cylinder 41, wherein a driving liquid input port 42 and a first driving liquid output port 43 are respectively arranged at two ends of the hydraulic driving cylinder 41, the driving liquid input port 42 is used for inputting a hydraulic signal for controlling the action of the brake friction plate 2 through hydraulic pressure, and the first driving liquid output port 43 is used for outputting liquid pressure so as to drive the wedge-shaped block 3 to move towards the direction approaching the brake friction plate 2;

the electric signal driving device 5 comprises a hollow electric driving cylinder 51, two ends of the electric driving cylinder 51 are respectively provided with an electric signal executing device and a second driving liquid output port 52, the electric signal executing device is used for executing the action of raising the liquid pressure in the electric driving cylinder 51 by corresponding electric signals, and the second driving liquid output port 52 is used for outputting the liquid pressure so as to drive the wedge-shaped block 3 to move towards the direction approaching the brake friction plate 2.

In this embodiment, as shown in fig. 2 and 3, the hydraulic driving cylinder 41 includes a driving fluid input port 42 and a first driving fluid output port 43, and in the specific implementation, the driving fluid input port 42 is connected to a conventional hydraulic brake system of the vehicle. For example, when a brake pedal of the vehicle is depressed, the brake fluid pump can output fluid pressure to the drive fluid input port 42. In this embodiment, the hydraulic drive cylinder 41 is capable of pushing the wedge 3 to brake in response to a braking action by a conventional hydraulic brake system of the vehicle.

The electric signal driving device 5 comprises a hollow electric driving cylinder 51, and in this embodiment, the electric signal driving device 5 can respond to an electric signal of vehicle braking and convert the electric signal into liquid pressure to push the wedge-shaped block 3 to perform braking action.

In a specific implementation process, the brake pedal of the vehicle is provided with an angle sensor, so that the action of stepping on the brake pedal can be converted into an electric signal, and the electric signal executing device in this embodiment can be that the linear motor pushes the piston in the electric driving cylinder 51 to move and then is converted into hydraulic pressure for pushing the wedge block 3. Similarly, other electric signal actuators capable of linear motion, such as the electromagnet 55, may be used.

Further, symmetrical inner inclined planes are arranged at two ends of the mounting seat 21, and the braking force driving mechanism comprises two symmetrically arranged wedge blocks 3, wherein outer inclined planes of the two wedge blocks 3 are symmetrically and oppositely arranged;

the drive part is capable of pushing one or more wedge blocks 3 of the two wedge blocks 3 to move in a direction approaching the brake friction plate 2.

In this embodiment, as shown in fig. 6, two wedge blocks 3 are disposed on two sides of the mounting seat 21, and the two wedge blocks 3 push the mounting seat 21 inwards from two sides of the mounting seat 21 at the same time, so as to prevent unbalanced braking force caused by torque generated in the pushing process.

Further, the tail parts of the two wedge-shaped blocks 3 are respectively provided with a hydraulic cylinder, and each hydraulic cylinder comprises a hollow first cavity 61, a first piston 62 arranged in the first cavity 61, a connecting rod 63 connecting the first piston 62 and the tail parts of the wedge-shaped blocks 3, and a liquid inlet 64 and a liquid outlet (not shown in the figure) arranged at two sides of the first piston 62;

the liquid inlets 64 of the two hydraulic cylinders are communicated with each other and the driving part through liquid pipelines, and the driving part can output liquid pressure to the liquid inlets 64 of the two hydraulic cylinders at the same time.

In this embodiment, two hydraulic cylinders are respectively disposed outside the two wedge blocks 3, the structure inside the hydraulic cylinders is as shown in fig. 2 and 3, the liquid inlet 64 is connected with the driving part, and the hydraulic pressure output by the driving part can be communicated into the first cavity 61 through a pipeline to push the first piston 62 to move.

The first piston 62 pushes the wedge 3 to move through the connecting rod 63, thereby performing a braking action.

The hydraulic driving device 4 and the electric signal driving device 5 are respectively arranged at the tail parts of the two hydraulic cylinders;

the liquid inlets 64 of the two hydraulic cylinders are respectively provided with a three-way connecting piece, and the three-way connecting piece is respectively connected with the liquid inlets 64 of the two hydraulic cylinders and the first driving liquid outlet 43 of the hydraulic driving device 4 or the second driving liquid outlet 52 of the electric signal driving device 5.

The liquid inlets 64 of the two hydraulic cylinders are mutually communicated through a liquid pipeline, and the driving part outputs hydraulic pressure to any one hydraulic cylinder so as to simultaneously drive the two braking friction plates 2 to move towards the brake disc 4 and provide balanced braking force.

Further, a reset spring piece 7 is arranged between the two wedge blocks 3, a bending part 71 is arranged on the reset spring piece 7, and the bending part 71 is bent towards the direction approaching to the brake friction plate 2;

when the driving part pushes the two wedge blocks 3 to move, the two braking friction plates 2 are mutually close and contacted with the arched part 72, and squeeze the bending part 71, so that the bending part 71 is deformed; after the wedge-shaped block 3 is released by the driving part, the bending part 71 is contacted with the brake friction plate 2, and the bending part 71 is deformed and recovered and pushes the brake friction plate 2 to move in a direction away from the other brake friction plate 2.

In this embodiment, as shown in fig. 3, the distance between the brake disc 4 and the inner inclined surface is larger than the width between the brake friction plate 2 and the mounting seat 21, and when the wedge block 3 moves inwards, the distance is reduced, so that the brake friction plate 2 can be pushed to move. After releasing the brake, the wedge 3 can move backward following the first piston 62, and the brake pad 2 can rock in the space between the brake disc 4 and the inner inclined surface. If the vibration generated by the running of the vehicle causes the brake pads 2 to contact the disc rotor 4, heat may be generated and kinetic energy may be lost.

The purpose of the reset spring 7 is to make the brake friction plate 2 and the mounting seat 21 cling to the inner inclined surface of the wedge-shaped block 3, so as to prevent shaking.

Specifically, as shown in fig. 3, two reset spring plates 7 are both clamped on the wedge-shaped block 3 and are arranged in parallel with the brake friction plates 2, the reset spring plates 7 are provided with bending portions 71, and the bending portions 71 can keep contact with the brake friction plates 2 to push the two brake friction plates 2 to keep away from the position of the brake disc 4.

When the braking operation is performed, the bending portion 71 deforms, and the brake pad 2 can be brought into contact with the brake disc 4.

Further, two bending portions 71 are provided in the length direction of the return spring 7, an arch portion 72 is provided between the two bending portions 71, and the arch direction of the arch portion 72 is opposite to the bending direction of the bending portion 71.

As shown in fig. 6, when the two wedge blocks 3 are closed, the arch portion 72 moves toward each other, and a space for deforming the bent portion 71 is provided.

Further, a second piston 53, an air hole 54 passing through the electric driving cylinder 51, and an electromagnet 55 are disposed in the electric driving cylinder 51, and the air hole 54 and the second driving liquid output port 52 are disposed at two sides of the second piston 53, respectively;

a second spring is arranged between the second piston 53 and the inner wall of the electric drive cylinder 51, a magnetic part 56 is arranged on the second piston 53, and the electromagnet 55 can push the second piston 53 to move through the magnetic part 56.

In this embodiment, a specific structure of the electric driving cylinder 51 is proposed, as shown in fig. 5, a magnetic portion 56 is provided on the second piston 53, an electromagnet 55 is provided in the electric driving cylinder 51, and an electric signal interface (not shown in the figure) for controlling the electromagnet 55 is provided outside the electric driving cylinder 51.

In a specific implementation process, the electromagnet 55 can generate a magnetic field in response to an electric signal, and the magnetic part 56 pushes the second piston 53 to move, so that the liquid between the second piston 53 and the second driving liquid output port 52 is output, and hydraulic pressure is generated.

The second spring is used to push the second piston 53 to return after the electromagnet 55 is turned off.

Further, the hydraulic driving cylinder 41 is provided with a third piston 44, and a third spring is arranged between the third piston 44 and the inner wall of the hydraulic driving cylinder 41;

the driving liquid input port 42 and the first driving liquid output port 43 are respectively arranged at two sides of the third piston 44, and a first limiting block 45 is arranged at the end part, close to the driving liquid input port 42, of the hydraulic driving cylinder 41.

In this embodiment, a specific hydraulic driving cylinder 41 is proposed, as shown in fig. 4, in a specific implementation process, after a brake pedal of a vehicle is depressed, a brake fluid pump can output a fluid pressure to a driving fluid input port 42, push a third piston 44 to move, and further output a fluid between the third piston 44 and a first driving fluid output port 43, so as to generate a hydraulic pressure. The third spring acts to urge the third piston 44 to return after the brake pedal is released.

Further, the tail parts in the two hydraulic cylinders are respectively provided with a second limiting block 35; the shell 1 is provided with mounting holes. In this embodiment, the second limiting block 35 is used to limit the moving position of the wedge block 3.

The embodiments of the present disclosure have been described above, the above description is illustrative, not exhaustive, and the scope of the invention is not limited to the above embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the spirit and scope of the invention. That is, various changes and modifications in form and detail may be made by one skilled in the art, which are deemed to fall within the scope of the present invention. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. The utility model provides an electrohydraulic composite brake caliper, includes the casing, sets up two braking friction discs that set up in the casing symmetry, promotes two braking friction discs to the braking force actuating mechanism who is close to the direction removal each other, its characterized in that: the braking force driving mechanism comprises a mounting seat for fixing the braking friction plate and a driving part which is arranged on the side surface of the mounting seat, is used for driving the wedge block to move towards the direction close to the braking friction plate;

2. An electro-hydraulic composite brake calliper according to claim 1, wherein: the driving part comprises a hydraulic driving device and an electric signal driving device;

3. An electrohydraulic composite brake caliper according to claim 1 or 2, wherein: the two ends of the mounting seat are respectively provided with a symmetrical inner inclined plane, the braking force driving mechanism comprises two symmetrically arranged wedge-shaped blocks, and the outer inclined planes of the two wedge-shaped blocks are symmetrically and oppositely arranged;

4. An electro-hydraulic composite brake calliper according to claim 3, wherein: the tail parts of the two wedge blocks are respectively provided with a hydraulic cylinder, and each hydraulic cylinder comprises a hollow first cavity, a first piston arranged in the first cavity, a connecting rod for connecting the first piston with the tail parts of the wedge blocks, and a liquid inlet and a liquid outlet which are arranged at two sides of the first piston;

5. An electro-hydraulic composite brake calliper according to claim 4, wherein: the hydraulic driving device and the electric signal driving device are respectively arranged at the tail parts of the two hydraulic cylinders;

6. An electro-hydraulic composite brake calliper according to claim 3, wherein: a reset elastic piece is arranged between the two wedge blocks, a bending part is arranged on the reset elastic piece, and the bending part bends towards the direction close to the brake friction plate;

7. An electro-hydraulic composite brake calliper according to claim 3, wherein: the reset spring piece is characterized in that two bending parts are arranged in the length direction of the reset spring piece, an arch part is arranged between the two bending parts, and the arch direction of the arch part is opposite to the bending direction of the bending parts.

8. An electro-hydraulic composite brake calliper according to claim 2, wherein: the electric driving cylinder is internally provided with a second piston, an air hole penetrating through the electric driving cylinder and an electromagnet, and the air hole and the second driving liquid output port are respectively arranged at two sides of the second piston;

9. An electro-hydraulic composite brake calliper according to claim 2, wherein: the hydraulic driving cylinder is provided with a third piston and a third spring arranged between the third piston and the inner wall of the hydraulic driving cylinder;

10. An electro-hydraulic composite brake calliper according to claim 3, wherein: the tail parts in the two hydraulic cylinders are respectively provided with a second limiting block; the shell is provided with a mounting hole.