CN218063170U

CN218063170U - EMB brake

Info

Publication number: CN218063170U
Application number: CN202221535488.4U
Authority: CN
Inventors: 倪敏
Original assignee: Beijing Chehejia Automobile Technology Co Ltd
Current assignee: Beijing Chehejia Automobile Technology Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-12-16
Anticipated expiration: 2032-06-17

Abstract

The disclosure relates to the technical field of automobile brake systems, in particular to an EMB brake. The EMB brake comprises a hydraulic transmission mechanism and a brake disc; the hydraulic transmission mechanism comprising the pressure build-up piston device and the brake piston device is arranged, so that a first hydraulic cavity of the pressure build-up piston device is communicated with a second hydraulic cavity of the brake piston device; the braking force in the pressure build-up piston device can be transmitted to the brake piston device, and the brake piston device is pressed to the brake disc, so that braking is carried out. Above-mentioned EMB stopper can utilize hydraulic pressure mechanism's characteristic, reduces the intensity requirement to transmitting mechanical structure, and does not influence the adaptation with parallel bars calliper, can also block the heat-conduction between mechanical structure, improves the life-span of motor.

Description

EMB brake

Technical Field

The disclosure relates to the technical field of automobile brake systems, in particular to an EMB brake.

Background

The mass production of the existing EMB scheme has not made a substantial progress all the time, and one of the difficulties lies in the design and manufacture of the transmission mechanism, which is difficult to achieve the performance requirements of large load and high durability within the cost meeting the market expectation. In the existing EMB braking technology, the torque of a motor is gradually amplified through a series of speed reducing mechanisms in the process of reducing the speed, the axial force borne by the mechanisms reaches the maximum at the tail end of a transmission chain, and the existing mechanical structure is difficult to meet the conduction requirement of braking force in a cost controllable range.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, the present disclosure provides an EMB brake.

The present disclosure provides an EMB brake comprising a hydraulic transmission mechanism and a brake disc; the hydraulic transmission mechanism comprises a pressure build-up piston device and a brake piston device, and the pressure build-up piston device is provided with a first hydraulic cavity; the brake piston device is provided with a second hydraulic cavity communicated with the first hydraulic cavity; the brake piston device is connected with the brake disc.

Optionally, the device further comprises an EMB braking mechanism, the EMB braking mechanism comprises a motor, a gear reduction box and a lead screw, an output shaft of the motor is in transmission connection with an input end of the gear reduction box, an output end of the gear reduction box is in transmission connection with the lead screw, and a telescopic end of the pressure build piston device is in threaded connection with the lead screw.

Optionally, the motor and the pressure build-up piston device are respectively arranged on two sides of the brake piston device.

Optionally, the cross-sectional area of the piston cylinder of the pressure build-up piston device is smaller than the cross-sectional area of the piston cylinder of the brake piston device.

Optionally, the hydraulic transmission mechanism further comprises an outer die assembly, and a piston cylinder of the build-up piston device and a piston cylinder of the brake piston device are arranged in the outer die assembly.

Optionally, the number of the brake piston devices is multiple, the multiple brake piston devices are uniformly arranged along the circumferential direction of the pressure build-up piston device, and the cross sectional area of the piston cylinder of the pressure build-up piston device is smaller than the sum of the cross sectional areas of the piston cylinders of the multiple brake piston devices.

Optionally, the number of the brake piston devices is two, the two brake piston devices are arranged oppositely, and the pressure build-up piston device is arranged coaxially with the brake disc.

Optionally, the diameter of the brake disc is not less than the sum of the diameter of the pressure build-up piston device and the diameter of the brake piston device.

Optionally, the pressure build-up piston device is arranged within a piston cylinder of the brake piston device.

Optionally, a protrusion is provided on a side of the telescopic end of the pressure build-up piston device facing the first hydraulic chamber.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

according to the EMB brake provided by the disclosure, the hydraulic transmission mechanism comprising the pressure build-up piston device and the brake piston device is arranged, so that the first hydraulic cavity of the pressure build-up piston device is communicated with the second hydraulic cavity of the brake piston device; the braking force in the pressure build-up piston device can be transmitted to the brake piston device, and the brake piston device is pressed to the brake disc, so that braking is carried out. Above-mentioned EMB stopper has utilized the characteristic of hydraulic pressure mechanism, has avoided directly braking through mechanical structure, reduces the intensity requirement to transmitting mechanical structure, and does not influence the adaptation with parallel bars calliper, can also block the heat-conduction between mechanical structure simultaneously, improves the life of motor.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic diagram of a prior art EMB brake;

FIG. 2 is a schematic view of an EMB brake according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an EMB brake in which a plurality of brake piston devices are uniformly arranged around an axis of a pressure build-up piston device according to an embodiment of the present disclosure;

fig. 4 is a schematic view of an EMB brake in which the pressure build-up piston device is disposed in a holding member according to an embodiment of the present disclosure;

fig. 5 is a schematic view of an EMB brake in which a convex portion abuts against a holding member according to an embodiment of the disclosure.

Reference numerals:

1. a hydraulic transmission mechanism; 11. a pressure build piston device; 111. a telescoping member; 112. a boss portion; 12. a brake piston arrangement; 121. a holding member; 13. an outer mold assembly; 141. a first seal member; 142. a second seal member; 2. an EMB brake mechanism; 21. a lead screw; 22. a gear reduction box; 23. a motor; 3. a brake disk.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 2, an EMB brake provided by the embodiment of the present disclosure includes a hydraulic transmission mechanism 1 and a brake disc 3; the hydraulic transmission mechanism 1 comprises a pressure build-up piston device 11 and a brake piston device 12, and the pressure build-up piston device 11 is provided with a first hydraulic cavity; the brake piston device 12 has a second hydraulic pressure chamber that communicates with the first hydraulic pressure chamber; the brake piston device 12 is connected to the brake disk 3.

In more detail, the hydraulic transmission mechanism 1 comprises a pressure build-up piston device 11 and a brake piston device 12, the pressure build-up piston device 11 comprises a telescopic piece 111 and a first piston cylinder, the telescopic piece 111 is arranged in the first piston cylinder, the telescopic piece 111 is matched with a piston of the first piston cylinder, and a first hydraulic cavity is formed by the telescopic piece 111 and the first piston cylinder; the brake piston device 12 comprises a butting part 121 and a second piston cylinder, the butting part 121 is arranged in the second piston cylinder, the butting part 121 is matched with a piston of the second piston cylinder, and a second hydraulic cavity is formed between the butting part 121 and the second piston cylinder; the first hydraulic cavity is communicated with the second hydraulic cavity; the abutting piece 121 abuts against the brake disk 3.

In the EMB brake, a mechanical structure driven by a motor 23 drives the telescopic part 111 to perform linear motion in the first hydraulic cavity, so as to transmit the pressure in the first hydraulic cavity to the second hydraulic cavity, and press the abutting part 121 to the brake disc 3, thereby realizing braking of the wheel. The mechanical structure can be a screw sleeve, a worm gear, a trapezoidal screw, a ball screw and the like, and in the traditional EMB brake, the mechanical structure bears the maximum axial force when the vehicle brakes; in the disclosure, by arranging the hydraulic transmission mechanism 1 between the braking force output end of the mechanical structure and the brake disc 3, the stress of the mechanical structure can be reduced by arranging different cross-sectional areas between the first piston cylinder of the pressure build-up piston device 11 and the second piston cylinder of the brake piston device 12.

By using the EMB brake described above, the strength requirement for the transmission mechanism structure can be reduced by utilizing the characteristics of the hydraulic mechanism. In addition, with the popularization of electric driving vehicles, the vehicle weight is continuously increased, and more vehicle types use double-cylinder calipers, so that the mechanical design complexity of the conventional EMB brake is multiplied, the reliability is low, and the hydraulic transmission mechanism 1 can be matched with the double-cylinder calipers; meanwhile, heat conduction between mechanical structures can be blocked, failure of the motor 23 caused by thermal demagnetization is avoided, and the service life of the motor 23 is prolonged.

In some embodiments, the EMB braking mechanism 2 is further included, the EMB braking mechanism 2 includes a motor 23, a gear reduction box 22 and a lead screw 21, an output shaft of the motor 23 is in transmission connection with an input end of the gear reduction box 22, an output end of the gear reduction box 22 is in transmission connection with the lead screw 21, and the telescopic piece 111 is in threaded connection with the lead screw 21. Specifically, the power output by the motor 23 is transmitted to the lead screw 21 after the number of the screws is increased through the gear reduction box 22, and the rotation can be converted into the linear motion through the lead screw 21, so as to drive the telescopic member 111 to perform the piston motion. Preferably, at least a portion of the lead screw 21 is disposed in the telescopic member 111, an inner circumference of the telescopic member 111 is screw-engaged with an outer circumference of the lead screw 21, and a length of a portion of the lead screw 21 screw-engaged with the telescopic member 111 is variable. Optionally, in some embodiments, the telescopic member 111 is sleeved on the lead screw 21, the telescopic member 111 is in thread sealing fit with the lead screw 21, and the telescopic member 111 can run on the lead screw 21.

In some embodiments, the motor 23 and the pressure build-up piston device 11 are respectively disposed on both sides of the brake piston device 12. Specifically, the above arrangement can provide space for the gear reduction box 22, so that a reduction box with a large transmission ratio can be arranged, and the reduction efficiency and stability are improved. Optionally, the hydraulic transmission mechanism further comprises a connecting pipeline for communicating the first piston cylinder and the second piston cylinder.

In some embodiments, the cross-sectional area of the piston cylinder of the build-up piston arrangement 11 is smaller than the cross-sectional area of the piston cylinder of the brake piston arrangement 12, i.e. the cross-sectional area of the first piston cylinder is smaller than the cross-sectional area of the second piston cylinder. Specifically, as the first hydraulic cavity is communicated with the second hydraulic cavity, the pressure intensity in the first hydraulic cavity is equal to that in the second hydraulic cavity; in this condition the cross-sectional area of the first piston cylinder is smaller than the cross-sectional area of the second piston cylinder, the force output by the abutment 121 towards the brake disc 3 is greater than the force transmitted by the mechanical structure to the telescopic element 111. Alternatively, in some embodiments, the hydraulic transmission mechanism 1 comprises one pressure build piston device 11 and a plurality of brake piston devices 12, and the cross-sectional area of the first piston cylinder is smaller than the sum of the cross-sectional areas of the plurality of second piston cylinders.

In some embodiments, the hydraulic drive mechanism 1 further comprises an outer die assembly 13, the outer die assembly 13 having a first piston cylinder and a second piston cylinder disposed therein. Specifically, the first piston cylinder and the second piston cylinder are arranged in the outer die assembly 13, so that the integration level of the whole hydraulic transmission mechanism 1 can be improved, and the size of the hydraulic transmission mechanism 1 can be reduced. Optionally, the pressure build-up piston device 11 and the brake piston device 12 are arranged adjacently, and a connecting pipeline is formed in the outer die assembly 13 and used for communicating the first hydraulic cavity with the second hydraulic cavity, and the channel is parallel to the moving direction of the telescopic part 111, so that the space between the pressure build-up piston device 11 and the brake piston device 12 can be saved to the greatest extent.

As shown in fig. 3, in some embodiments, the number of the brake piston devices 12 is multiple, the multiple brake piston devices 12 are uniformly arranged along the circumferential direction of the pressure build-up piston device 11, and the cross-sectional area of the piston cylinder of the pressure build-up piston device 11 is smaller than the sum of the cross-sectional areas of the piston cylinders of the multiple brake piston devices 12. Specifically, a plurality of brake piston devices 12 uniformly distributed around the axis of the pressure build-up piston device 11 can disperse force application at various positions of the brake disc 3, and meanwhile, the stress balance of the brake disc 3 can be ensured. Optionally, the above-mentioned plurality of brake piston devices 12 are communicated with each other for further ensuring the force balance of the brake disc 3, and avoiding the brake disc 3 from rolling during braking to cause local excessive wear.

In some embodiments, the number of the brake piston devices 12 is two, the two brake piston devices 12 are arranged opposite to each other, and the pressure buildup piston device 11 is arranged coaxially with the brake disc 3. In particular, the two braking piston devices 12 are arranged symmetrically with respect to the axis of the pressure build-up piston device 11, enabling a better adaptation to a parallel bar caliper. In more detail, the positions of the abutments 121 of the two pressure build-up piston devices 11 correspond to the piston positions of the parallel bar calipers.

In some embodiments, the diameter of the brake disc 3 is not smaller than the sum of the diameter of the pressure build-up piston device 11 and the diameter of the brake piston device 12. In particular, the arrangement described above ensures that the abutment is in full abutment with the brake disc 3 when the brake piston device 12 surrounds the pressure build-up piston device 11. Preferably, the radius of the brake disc 3 is equal to the sum of the radius of the pressure build-up piston device 11 and the diameter of the abutting piece 121, that is, when the cross-sectional area of the first piston cylinder is determined and the abutting piece is completely abutted against the brake disc 3, the cross-sectional area of the second piston cylinder can reach the maximum value, and thus the force amplification effect is most remarkable.

As shown in fig. 4, in some embodiments, the pressure build-up piston device 11 is arranged in a piston cylinder, i.e. a counter-holder 121, of the brake piston device 12. Specifically, to build pressure piston device 11 and set up in holding piece 121, can merge first hydraulic pressure chamber and second hydraulic pressure chamber, need not to set up extra passageway that is used for connecting first hydraulic pressure chamber and second hydraulic pressure chamber, space in the saving hydraulic transmission mechanism 1 that can the at utmost. Preferably, the telescopic member 111 and the abutting member 121 are coaxially arranged, so as to facilitate assembly and processing on the one hand, and ensure that the stress on the shaft is balanced everywhere on the abutting member 121 on the other hand.

In some embodiments, a first receiving groove is circumferentially formed in one side of the inner wall of the first piston cylinder facing the first hydraulic pressure chamber, a first sealing element 141 is arranged between the first receiving groove and the telescopic element 111, and the first sealing element 141 is respectively in sealing connection with the first receiving groove and the telescopic element 111 and is used for sealing the first hydraulic pressure chamber; a second accommodating groove is formed in one side, facing the second hydraulic cavity, of the inner wall of the second piston cylinder in the circumferential direction, a second sealing element 142 is arranged between the second accommodating groove and the abutting part 121, and the second sealing element 142 is in sealing connection with the second accommodating groove and the abutting part 121 respectively and used for sealing the second hydraulic cavity. Preferably, the first and

second sealing members

141 and 142 are made of a resilient elastic material.

As shown in fig. 5, in some embodiments, the telescopic end of the pressurizing piston device 11, i.e., the side of the telescopic member 111 facing the first hydraulic chamber, is provided with a projection 112. Specifically, when the hydraulic transmission mechanism 1 fails, the above-mentioned projection 112 can directly abut on the abutting piece 121 to directly perform mechanical transmission as a backup. Preferably, a groove for matching with the above-mentioned protruding part 112 is provided on the side of the abutting member facing the telescopic member 111, so that the protruding part 112 can be limited.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An EMB brake is characterized by comprising a hydraulic transmission mechanism and a brake disc; the hydraulic transmission mechanism comprises a pressure build-up piston device and a brake piston device, and the pressure build-up piston device is provided with a first hydraulic cavity; the brake piston device has a second hydraulic pressure chamber that communicates with the first hydraulic pressure chamber; the brake piston device is connected with the brake disc.

2. The EMB brake of claim 1, further comprising an EMB brake mechanism, wherein the EMB brake mechanism comprises a motor, a gear reduction box and a lead screw, an output shaft of the motor is in transmission connection with an input end of the gear reduction box, an output end of the gear reduction box is in transmission connection with the lead screw, and a telescopic end of the pressure build-up piston device is in threaded connection with the lead screw.

3. The EMB brake of claim 2, wherein the motor and the pressure build-up piston device are disposed on both sides of the brake piston device, respectively.

4. The EMB brake of claim 1, wherein a cross-sectional area of a piston cylinder of the build-up piston device is less than a cross-sectional area of a piston cylinder of the brake piston device.

5. The EMB brake of claim 1, wherein the hydraulic transmission mechanism further comprises an outer mold assembly within which the piston cylinder of the build-up piston device and the piston cylinder of the brake piston device are disposed.

6. The EMB brake of claim 1, wherein the number of the brake piston devices is plural, and the plural brake piston devices are uniformly arranged along the circumferential direction of the pressure build-up piston device; the cross-sectional area of the piston cylinder of the pressure build-up piston device is smaller than the sum of the cross-sectional areas of the piston cylinders of the brake piston devices.

7. The EMB brake of claim 6, wherein the number of the brake piston devices is two, the two brake piston devices are oppositely disposed, and the pressure build-up piston device is disposed coaxially with the brake disc.

8. The EMB brake of claim 7, wherein the diameter of the brake disc is not less than the sum of the diameter of the build-up piston device and the diameter of the brake piston device.

9. The EMB brake of claim 5, wherein the build-up piston device is disposed within a piston cylinder of the brake piston device.

10. The EMB brake according to claim 9, wherein a protrusion is provided on a side of the telescopic end of the pressure buildup piston device facing the first hydraulic pressure chamber.