CN114776732A - Low-drag braking system device and control method thereof - Google Patents
Low-drag braking system device and control method thereof Download PDFInfo
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- CN114776732A CN114776732A CN202210432303.5A CN202210432303A CN114776732A CN 114776732 A CN114776732 A CN 114776732A CN 202210432303 A CN202210432303 A CN 202210432303A CN 114776732 A CN114776732 A CN 114776732A
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- sealing groove
- brake
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- sealing
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 88
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000208734 Pisonia aculeata Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
- F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
- F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
- F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
- F16D65/186—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes with full-face force-applying member, e.g. annular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2125/00—Components of actuators
- F16D2125/02—Fluid-pressure mechanisms
- F16D2125/08—Seals, e.g. piston seals
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a low-drag braking system device and a control method thereof, wherein the device comprises a braking caliper piston, a sealing groove and a sealing ring, the sealing ring is arranged in the sealing groove, and the braking caliper piston returns through the resilience force of the sealing ring; the sealing groove comprises a sealing groove body, a sealing groove front bottom edge and a sealing groove rear bottom edge, a sealing groove front chamfer is arranged between the sealing groove front bottom plate and the sealing groove body, and a sealing groove rear chamfer is arranged between the sealing groove rear bottom plate and the sealing groove body; preceding chamfer portion of seal groove includes bevel portion and arc portion, and the seal groove body is connected to the higher authority of bevel portion, and the lower limit of bevel portion is connected with the higher authority of arc portion, and the lower limit of arc portion is connected with the preceding base of seal groove. The technical scheme can obviously reduce the dragging torque of the braking system, thereby prolonging the service life of the braking system, reducing the power consumption of the whole vehicle and improving the driving range of the electric vehicle.
Description
Technical Field
The invention belongs to the technical field of vehicle braking, and particularly relates to a low-drag braking system device and a control method thereof.
Background
At present, in the field of vehicle braking, a disc brake is mostly used for braking a vehicle, after braking, a brake pad and a brake disc are not completely separated, so that dragging torque is generated, the dragging torque influences the service life of a braking system and simultaneously increases the power consumption of the whole vehicle, and the dragging torque of the brake caliper is difficult to reduce under the condition of the prior art, so that the reduction of the dragging torque of the brake is helpful for reducing the power consumption of the vehicle and improving the driving range.
When the pedal displacement and the pedal force are transmitted to the calipers through the vacuum booster and a pipeline, a caliper piston is moved by hydraulic acting force and is in contact with a brake disc to generate deceleration, the brake fluid volume required in a caliper wheel cylinder is called fluid demand volume, and if the fluid demand volume is larger, the pedal stroke required for generating specific brake deceleration is longer.
When a driver releases braking, the caliper piston returns through the pull-back elastic force of the caliper sealing ring, the displacement of the piston is called as piston return amount, if the piston return amount is larger, the brake disc and the friction plate are more easily separated, and the brake dragging torque is smaller. The liquid demand and the return quantity of the piston are directly influenced by the performance of the caliper sealing ring, so that the performance of the caliper sealing ring influences the performance of the whole braking system.
The dragging torque of a brake caliper assembly is usually specified to be not more than 5Nm, the existing better floating type caliper can be below 2Nm, and the dragging torque is difficult to be reduced to be below 1.5Nm at present due to the consideration of the influence of liquid demand and return quantity of a piston on the feel of a brake pedal and the braking safety.
Disclosure of Invention
The invention aims to provide a low-drag braking system device and a control method thereof, which can reduce the drag torque of a braking system adopting a floating caliper, reduce the power consumption of the whole vehicle and improve the driving range of an electric vehicle.
In order to realize the purpose, the invention is realized by the following technical scheme:
a low-drag brake system device comprises a brake caliper piston, a seal groove and a seal ring, wherein the seal ring is arranged in the seal groove, and the brake caliper piston returns through the resilience force of the seal ring;
the sealing groove comprises a sealing groove body, a sealing groove front bottom edge and a sealing groove rear bottom edge, a sealing groove front chamfer is arranged between the sealing groove front bottom plate and the sealing groove body, and a sealing groove rear chamfer is arranged between the sealing groove rear bottom plate and the sealing groove body;
preceding chamfer portion of seal groove includes bevel portion and arc portion, the seal groove body is connected to the higher authority of bevel portion, and the lower limit of bevel portion is connected with the higher authority of arc portion, the lower limit of arc portion is connected with the preceding base of seal groove.
Further, the opening of the arc-shaped part faces outwards.
Further, the arc-shaped part is a quarter of a circular arc, and the radius is 0.5 mm.
Furthermore, the height of the front bottom edge of the sealing groove and the lower edge of the sealing groove body is 2.0mm, and the included angle between the inclined edge part and the extension line of the front bottom edge of the sealing groove is 50 degrees.
A control method of a low-drag brake system apparatus using any one of the above low-drag brake system apparatuses, comprising the steps of:
s1, acquiring an accelerator pedal displacement signal of the target vehicle;
s2, pre-filling the brake system after the accelerator pedal is judged to be released;
s3, obtaining a brake pedal displacement signal of the target vehicle;
s4, searching the brake pressure corresponding to the pedal displacement, and taking the searched brake pressure as a target pressure;
s5, acquiring actual brake pressure;
and S6, performing pressure adjustment on the target vehicle according to the target pressure and the actual brake pressure.
Further, step S4 is to search for the brake pressure gauge through the pedal displacement, and the gauge is obtained through testing the brake pressure generated by the different distances traveled by the pedal.
Further, the specific pressure adjustment of step S6 includes the following steps:
s61, the system determines the difference beta between the target pressure and the actual brake pressure;
if beta is in the set range, no pressure regulation is carried out, if beta is smaller than the set range, the system carries out pressure compensation, and if beta is larger than the set range, the system releases corresponding pressure.
Compared with the prior art, the invention has the beneficial effects that:
the device and the control method provided by the invention can obviously reduce the dragging torque of the braking system, thereby prolonging the service life of the braking system, reducing the power consumption of the whole vehicle and improving the driving range of the electric vehicle.
Drawings
FIG. 1 is a schematic view of a brake caliper structure;
FIG. 2 is a schematic view of a conventional seal groove and seal ring fit structure;
FIG. 3 is a schematic view of a conventional seal groove structure;
FIG. 4 is a schematic view of a seal groove structure according to the present invention;
FIG. 5 is a flow chart of a method for controlling the braking system according to the present invention.
Description of the reference numerals
1-caliper, 2-piston, 3-sealing ring, 4-inner friction plate, 5-brake disc, 6-outer friction plate, 7-sealing groove, 8-sealing groove rear chamfer, 9-sealing groove front chamfer, 71-sealing groove body, 72-sealing groove front bottom edge, 73-sealing groove rear bottom edge, 74-bevel edge part and 75-arc part.
Detailed Description
The following embodiments are merely exemplary, which can be used to explain and illustrate the technical solutions of the present invention, and should not be interpreted as limiting the technical solutions of the present invention.
As shown in figure 1, the brake caliper has an internal structure and a sealing groove structure, and the sealing groove is a special-shaped groove for accommodating a sealing ring and plays a role in supporting the deformation of the sealing ring.
Fig. 2 is a schematic diagram illustrating the sealing groove and the sealing ring in the prior art, where in fig. 2, the x direction is the radial direction of the piston, and the y direction is the central axial direction of the piston. In the use, when calliper assembly pressure build, hydraulic pressure promotes piston 2 and moves towards 5 directions of brake disc, because there is frictional force again in seal groove 7 and the piston direct contact, sealing washer 3 is extruded and takes place to warp progressively and fill in the chamfer before the seal groove. In the process of brake release, the piston is forced to move back under two aspects of acting force, on one hand, the extruded sealing ring is restored to be the original state, the piston is pushed to return, on the other hand, the rotating brake disc 5 pushes the friction plate to move back, and the return of the piston and the friction plate directly determines the gap between the brake disc and the friction plate.
The sealing groove structure specifically comprises an inner diameter, an outer diameter and a height of the sealing groove, a front chamfer of the sealing groove, a rear chamfer of the sealing groove and an angle of the bottom of the sealing groove. The inner diameter of the sealing groove is determined by the size selection of the piston, and the outer diameter and the groove height are determined by the diameter of the piston and the size of the rectangular sealing ring. The front chamfer of the sealing groove influences the liquid demand and the dragging torque of the caliper 1, if the front chamfer is too large, the front chamfer is filled in the sealing ring when the wheel cylinder is pressurized, the return amount of the piston after pressure relief is also larger, and the braking idle stroke is long under the limit condition.
As shown in FIG. 3, which is a schematic diagram of the structure of the existing sealing groove, the type and size of the front chamfer of the existing sealing groove are shown, and the sealing groove adopting the structure takes a piston with a diameter of 60mm as an example, the piston return amount is between 0.18mm and 0.30mm, the liquid requirement is between 2.0 ml and 2.3ml, and the drag is between 2Nm and 5 Nm.
As shown in FIG. 4, this application is for the improvement technique to present seal groove structure, and this application provides a low braking system device that drags, including brake caliper piston, seal groove and sealing washer, the sealing washer sets up in the seal groove, and the brake caliper piston carries out the return through the resilience force of sealing washer.
The sealing groove 7 comprises a sealing groove body 71, a sealing groove front bottom edge 72 and a sealing groove rear bottom edge 73, a sealing groove front chamfer is arranged between the sealing groove front bottom plate and the sealing groove body, and a sealing groove rear chamfer is arranged between the sealing groove rear bottom plate and the sealing groove body.
The chamfer portion includes bevel portion 74 and arc 75 before the seal groove, and the opening of arc is outside, and the arc is the quarter circular arc, and the radius is 0.5 mm. The upper edge of the oblique edge part is connected with the sealing groove body, the lower edge of the oblique edge part is connected with the upper edge of the arc-shaped part, and the lower edge of the arc-shaped part is connected with the front bottom edge of the sealing groove.
In this embodiment, the height of base and the lower limb of seal groove body before the seal groove is 2.0mm, and the contained angle of the extension line of base before oblique limit portion and the seal groove is 50 degrees. The sealing groove adopting the structure takes a piston with the diameter of 60mm as an example, the piston return amount is between 0.35mm and 0.50mm, and the liquid requirement is between 2.3ml and 3.0ml, so that the drag is reduced to 0.5 Nm to 1.5 Nm.
As shown in fig. 5, a flow chart of a brake control system using the low-drag brake system device of the present application is different from a conventional vacuum booster, and an electric booster is used for performing brake boosting, which can ensure that the pressure in the brake system meets the expectation of a driver by a method of pre-filling and collecting the pressure in a brake system pipeline and compensating in real time, so as to avoid the problems of too long brake stroke or too small brake force caused by the change of the chamfer of the sealing groove.
Before control, the method further comprises the steps of manufacturing a pedal displacement and brake pressure gauge, wherein in the application, the gauge is manufactured by sequentially changing the moving distance of the pedal, detecting the brake pressure generated by the different moving distances of the pedal through a pressure sensor, and manufacturing the gauge by using the moving distance of the pedal and the generated corresponding brake pressure.
The method specifically comprises the following steps:
s1, acquiring an accelerator pedal displacement signal of the target vehicle;
s2, pre-filling the brake system after the accelerator pedal is judged to be released;
s3, obtaining a brake pedal displacement signal of the target vehicle;
s4, searching the brake pressure corresponding to the pedal displacement, and taking the searched brake pressure as the target pressure;
s5, acquiring actual brake pressure;
and S6, performing pressure regulation on the target vehicle according to the target pressure and the actual brake pressure.
The specific pressure adjustment of step S6 includes the steps of:
s61, the system determines the difference value beta between the target pressure and the actual brake pressure; if beta is in the set range, no pressure regulation is carried out, if beta is smaller than the set range, the system carries out pressure compensation, and if beta is larger than the set range, the system releases corresponding pressure.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A low-drag brake system device comprises a brake caliper piston, a seal groove and a seal ring, wherein the seal ring is arranged in the seal groove, and the brake caliper piston returns through the resilience force of the seal ring;
the sealing groove comprises a sealing groove body, a sealing groove front bottom edge and a sealing groove rear bottom edge, a sealing groove front chamfer part is arranged between the sealing groove front bottom plate and the sealing groove body, and a sealing groove rear chamfer part is arranged between the sealing groove rear bottom plate and the sealing groove body; it is characterized in that the preparation method is characterized in that,
chamfer portion includes bevel portion and arc portion before the seal groove, the seal groove body is connected to the higher authority of bevel portion, and the lower level of bevel portion is connected with the higher authority of arc portion, the lower level and the seal groove preceding base of arc portion are connected.
2. The low drag braking system device of claim 1, wherein said arcuate portion opens outwardly.
3. The low drag braking system device of claim 2, wherein said arcuate portion is a quarter of a circle having a radius of 0.5 mm.
4. The low drag braking system device of claim 1, wherein the height of the sealing groove front bottom edge from the lower edge of the sealing groove body is 2.0mm, and the angle between the beveled portion and the extension line of the sealing groove front bottom edge is 50 degrees.
5. A control method of a low-drag brake system apparatus using the low-drag brake system apparatus of any one of claims 1 to 4, characterized by comprising the steps of:
s1, acquiring an accelerator pedal displacement signal of the target vehicle;
s2, pre-filling the brake system after the accelerator pedal is judged to be released;
s3, obtaining a brake pedal displacement signal of the target vehicle;
s4, searching the brake pressure corresponding to the pedal displacement, and taking the searched brake pressure as the target pressure;
s5, acquiring actual brake pressure;
and S6, performing pressure adjustment on the target vehicle according to the target pressure and the actual brake pressure.
6. The control method of a low drag brake system device according to claim 5, wherein step S4 is performed by searching the pedal displacement and the brake pressure gauge obtained by testing the brake pressure generated by the different distances moved by the pedal.
7. The control method of a low-drag brake system device according to claim 5, wherein the specific pressure adjustment of step S6 includes the steps of:
s61, the system determines the difference beta between the target pressure and the actual brake pressure; if beta is in the set range, no pressure regulation is carried out, if beta is smaller than the set range, the system carries out pressure compensation, and if beta is larger than the set range, the system releases corresponding pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210432303.5A CN114776732A (en) | 2022-04-22 | 2022-04-22 | Low-drag braking system device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210432303.5A CN114776732A (en) | 2022-04-22 | 2022-04-22 | Low-drag braking system device and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114776732A true CN114776732A (en) | 2022-07-22 |
Family
ID=82433732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210432303.5A Pending CN114776732A (en) | 2022-04-22 | 2022-04-22 | Low-drag braking system device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114776732A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5325940A (en) * | 1992-02-01 | 1994-07-05 | Alfred Teves Gmbh | Disc brake cylinder groove with a recess consisting of three sector surfaces |
| JPH06249275A (en) * | 1993-02-22 | 1994-09-06 | Toyota Motor Corp | Disc brake device |
| US20050173215A1 (en) * | 2004-02-05 | 2005-08-11 | Shimano, Inc. | Apparatus for a disk brake |
| US20120091666A1 (en) * | 2010-10-18 | 2012-04-19 | Akebono Corporation | Brake caliper seal groove |
| KR20150024456A (en) * | 2013-08-26 | 2015-03-09 | 주식회사 만도 | Disc brake |
| WO2019230394A1 (en) * | 2018-05-29 | 2019-12-05 | 日立オートモティブシステムズ株式会社 | Disc brake |
| CN110816498A (en) * | 2019-11-27 | 2020-02-21 | 安徽江淮汽车集团股份有限公司 | Pressure compensation method, device and equipment for intelligent brake system and storage medium |
| CN112145582A (en) * | 2019-06-28 | 2020-12-29 | 比亚迪股份有限公司 | Disc brake, brake-by-wire system and vehicle |
| CN213039710U (en) * | 2020-06-30 | 2021-04-23 | 浙江亚太机电股份有限公司 | Brake caliper is last sunken groove area fillet formula seal groove structure |
| CN215521745U (en) * | 2021-06-23 | 2022-01-14 | 坤泰车辆系统（常州）有限公司 | Brake caliper with low liquid demand |
| CN114096759A (en) * | 2019-07-05 | 2022-02-25 | 株式会社万都 | Clamp type brake |
-
2022
- 2022-04-22 CN CN202210432303.5A patent/CN114776732A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5325940A (en) * | 1992-02-01 | 1994-07-05 | Alfred Teves Gmbh | Disc brake cylinder groove with a recess consisting of three sector surfaces |
| JPH06249275A (en) * | 1993-02-22 | 1994-09-06 | Toyota Motor Corp | Disc brake device |
| US20050173215A1 (en) * | 2004-02-05 | 2005-08-11 | Shimano, Inc. | Apparatus for a disk brake |
| US20120091666A1 (en) * | 2010-10-18 | 2012-04-19 | Akebono Corporation | Brake caliper seal groove |
| KR20150024456A (en) * | 2013-08-26 | 2015-03-09 | 주식회사 만도 | Disc brake |
| WO2019230394A1 (en) * | 2018-05-29 | 2019-12-05 | 日立オートモティブシステムズ株式会社 | Disc brake |
| CN112236603A (en) * | 2018-05-29 | 2021-01-15 | 日立汽车系统株式会社 | Disc brake |
| CN112145582A (en) * | 2019-06-28 | 2020-12-29 | 比亚迪股份有限公司 | Disc brake, brake-by-wire system and vehicle |
| CN114096759A (en) * | 2019-07-05 | 2022-02-25 | 株式会社万都 | Clamp type brake |
| CN110816498A (en) * | 2019-11-27 | 2020-02-21 | 安徽江淮汽车集团股份有限公司 | Pressure compensation method, device and equipment for intelligent brake system and storage medium |
| CN213039710U (en) * | 2020-06-30 | 2021-04-23 | 浙江亚太机电股份有限公司 | Brake caliper is last sunken groove area fillet formula seal groove structure |
| CN215521745U (en) * | 2021-06-23 | 2022-01-14 | 坤泰车辆系统（常州）有限公司 | Brake caliper with low liquid demand |
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