CN106438767A - Central parking brake device for coal mine engineering vehicle - Google Patents

Central parking brake device for coal mine engineering vehicle Download PDF

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Publication number
CN106438767A
CN106438767A CN201610715779.4A CN201610715779A CN106438767A CN 106438767 A CN106438767 A CN 106438767A CN 201610715779 A CN201610715779 A CN 201610715779A CN 106438767 A CN106438767 A CN 106438767A
Authority
CN
China
Prior art keywords
housing
driven disc
engineering vehicle
central parking
rotating plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610715779.4A
Other languages
Chinese (zh)
Inventor
乔建设
胡东方
梁华
张�林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FEICHENG ZHONGLI MACHINERY CO LTD
Original Assignee
FEICHENG ZHONGLI MACHINERY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FEICHENG ZHONGLI MACHINERY CO LTD filed Critical FEICHENG ZHONGLI MACHINERY CO LTD
Priority to CN201610715779.4A priority Critical patent/CN106438767A/en
Publication of CN106438767A publication Critical patent/CN106438767A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/24Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
    • F16D55/26Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
    • F16D55/36Brakes with a plurality of rotating discs all lying side by side
    • F16D55/40Brakes with a plurality of rotating discs all lying side by side actuated by a fluid-pressure device arranged in or one the brake
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00Type of actuator operation force
    • F16D2121/02Fluid pressure
    • F16D2121/04Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00External control of clutches by electric or electronic means
    • F16D2500/10System to be controlled
    • F16D2500/11Application
    • F16D2500/1107Vehicles
    • F16D2500/1112Heavy vehicle

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

A central parking brake device for a coal mine engineering vehicle comprises a clutch type brake arranged in a transmission shaft of the engineering vehicle. A cooling port communicating with oil of a torque converter of the engineering vehicle is arranged in the centrifugal brake. Through the clutch type brake, the transmission shaft of the engineering vehicle is in a connected or separated state, the clutch type brake is cooled through the oil of the torque converter of the engineering vehicle, a drum type central parking brake device and a disc type central parking brake device are not used any more, and thus the reliability of the central parking brake device is improved.

Description

Central parking braking device for colliery engineering vehicle
First, technical field
The present invention relates to a kind of central parking braking device, especially a kind of central parking braking for colliery engineering vehicle are filled Put.
2nd, background technology
In order to ensure the safety of engineering truck, need, on engineering truck, holding brake device is installed, thus be accordingly used in colliery engineering The central parking braking device of vehicle is a kind of important engineering mechanical components, in the existing central authorities for colliery engineering vehicle In holding brake device, it is all also drum-type and disc type central parking braking device, acts directly on the power transmission shaft of engineering truck, As drum-type and disc type central parking braking device are not connected with the hydraulic system of engineering truck, it is impossible to central parking braking Device control effectively, simultaneously because the torque of the power transmission shaft of engineering truck is big, central parking braking device is not carried out Cooling, reduces the unfailing performance of central parking braking device.
Based on existing technical problem, technical characteristic and technique effect, the application technical scheme of the present invention is made.
3rd, content of the invention
The object of the present invention is a kind of central parking braking device for colliery engineering vehicle.
In order to overcome above-mentioned technical disadvantages, it is an object of the invention to provide a kind of central parking for colliery engineering vehicle Brake unit, therefore improves the unfailing performance of central parking braking device.
For reaching above-mentioned purpose, the present invention is adopted the technical scheme that:Include and be arranged in the power transmission shaft of engineering truck Clutch brake, be provided with the colling end being connected with the fluid of the torque converter of engineering truck in clutch brake Mouthful.
Due to devising clutch brake, the power transmission shaft of engineering truck is made in connection or to divide by clutch brake From state, by the fluid of the torque converter of engineering truck, clutch brake is lowered the temperature, do not use in drum-type and disc type Centre holding brake device, therefore improves the unfailing performance of central parking braking device.
The present invention is devised, and is in the mode set disengaging type of connection or released state according to the power transmission shaft for making engineering truck The technical characteristic of brake.
The present invention is devised, clutch brake be set to include housing, input shaft, output shaft, piston, rotating plate, Driven disc, spring, mounting flange and pressing plate,
One end end face portion of input shaft is provided with mounting flange and the other end end face portion in input shaft is provided with actively Piece, the other end end face portion of output shaft be provided with mounting flange and output shaft one end end face portion be provided with driven Piece, is provided with main cavity in the housing and the main chamber body side surface in housing is provided with a pair cavity, and input shaft and output shaft are arranged In the two ends end face portion of the main cavity of housing and rotating plate and driven disc are arranged in the main cavity of housing, rotating plate and driven Piece is set to be respectively arranged with pressing plate on interlaced arranged distribution and the rotating plate in outer end end face and driven disc, in housing Pay in cavity and be provided with piston and an end face portion of piston is set to couple with pressing plate contact, in pressing plate and housing Spring is provided between the wall of side.
The present invention is devised, and housing is set to box-shaped body and is provided with housing cold with what the main cavity of housing was connected But port, is provided with housing and is set to the cooling port for paying highly pressurised liquid port that cavity connects and housing of housing It is connected with the fluid of the torque converter of engineering truck.
The present invention is devised, input shaft and output shaft is respectively set to axis body and input shaft and output shaft are respectively provided with It is to be coupled with housing by bearing.
The present invention is devised, and piston is set to L-shaped body and one end end face portion of piston is set to and outer end end face The pressing plate contact connection of driven disc connection.
The present invention is devised, rotating plate and driven disc is set to brake(-holder) block made of paper and driven disc is arranged on adjacent two Between rotating plate, rotating plate is arranged between adjacent two driven disc.
The present invention is devised, on the side wall that spring is set to be embedded in housing and spring be set to outer end end face from The pressing plate contact connection of moving plate connection.
The present invention is devised, and pressing plate is set to discoid body and pressing plate is respectively set to couple with rotating plate and driven disc.
The present invention is devised, the centrage of housing, the centrage of input shaft, the centrage of output shaft, the center of rotating plate Line, the centrage of driven disc, the centrage of the centrage of mounting flange and pressing plate are arranged on same straight line and are input into The driven disc of the rotating plate of axle and output shaft is set to the connection of mutual CONTACT WITH FRICTION formula, and piston and spring are set to promote with pressing plate Portable connection.
In the technical program, clutch brake of the power transmission shaft of engineering truck in connection or released state is made to attach most importance to Technical characteristic is wanted, in the technical field for the central parking braking device of colliery engineering vehicle, with novelty, creativeness And practicality, the term in the technical program is all can be explained with patent documentation in the art and understand.
4th, illustrate
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill Accompanying drawing to be used needed for art description is briefly described, it should be apparent that, drawings in the following description are only the present invention Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the schematic diagram of the present invention.
5th, specific embodiment
According to guidelines for examination, such as " with ", "comprising" and " including " term used in the present invention should be understood to not Allot presence or the interpolation of one or more of the other element or its combination.
In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertical ", The orientation of instruction such as " level ", " interior ", " outward " or position relationship are orientation or the position relationship of general expression, are for only for ease of The description present invention and simplification description, rather than the device or element of instruction or hint indication must be with specific orientation, Yi Te Fixed azimuth configuration and operation, are therefore not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " It is only used for describing purpose, and it is not intended that indicating or hint relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected;Can To be to be mechanically connected, or electrically connect;Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.
As long as additionally, the non-structure each other of involved technical characteristic in invention described below different embodiments Conflict is become just to be combined with each other.
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely retouched State, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based in the present invention Embodiment, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art, Belong to the scope of protection of the invention.
Fig. 1 be one embodiment of the present of invention, illustrate the present embodiment in conjunction with accompanying drawing, include housing 1, input shaft 2, Output shaft 3, piston 4, rotating plate 5, driven disc 6, spring 7, mounting flange 8 and pressing plate 9,
One end end face portion of input shaft 2 is provided with mounting flange 8 and the other end end face portion in input shaft 2 is provided with master Moving plate 5, is provided with mounting flange 8 in the other end end face portion of output shaft 3 and one end end face portion in output shaft 3 is provided with Driven disc 6, is provided with main cavity within the case 1 and the main chamber body side surface in housing 1 is provided with and pays a cavity, input shaft 2 and defeated Shaft 3 is arranged on the two ends end face portion of the main cavity of housing 1 and rotating plate 5 and driven disc 6 are arranged on the main cavity of housing 1 In, rotating plate 5 and driven disc 6 are set on interlaced arranged distribution and the rotating plate 5 in outer end end face and driven disc 6 point Pressing plate 9 is not provided with, and an end face portion for being provided with piston 4 and piston 4 in pair cavity of housing 1 is set to and pressing plate 9 Contact couples, and is provided with spring 7 between the side wall of pressing plate 9 and housing 1.
In the present embodiment, housing 1 is set to box-shaped body and is provided with housing 1 connect with the main cavity of housing 1 Cooling port, the colling end for paying the highly pressurised liquid port that connects of cavity and housing 1 being provided with housing 1 with housing 1 Mouth is set to be connected with the fluid of the torque converter of engineering truck.
In the present embodiment, input shaft 2 and output shaft 3 are respectively set to axis body and input shaft 2 and the difference of output shaft 3 It is set to couple with housing 1 by bearing.
In the present embodiment, piston 4 is set to L-shaped body and one end end face portion of piston 4 is set to and outer end end face Driven disc 6 connect 9 contact of pressing plate connection.
In the present embodiment, rotating plate 5 and driven disc 6 be set to brake(-holder) block made of paper and driven disc 6 be arranged on adjacent Between two rotating plates 5, rotating plate 5 is arranged between adjacent two driven disc 6.
In the present embodiment, on the side wall that spring 7 is set to be embedded in housing 1 and spring 7 is set to and outer end end face Driven disc 6 connect 9 contact of pressing plate connection.
In the present embodiment, pressing plate 9 is set to discoid body and pressing plate 9 is respectively set to and rotating plate 5 and driven disc 6 Connect.
In the present embodiment, the centrage of housing 1, the centrage of input shaft 2, the centrage of output shaft 3, rotating plate 5 Centrage, the centrage of driven disc 6, the centrage of the centrage of mounting flange 8 and pressing plate 9 are arranged on same straight line simultaneously And the rotating plate 5 of input shaft 2 and the driven disc 6 of output shaft 3 are set to the connection of mutual CONTACT WITH FRICTION formula, piston 4 and spring 7 and pressure Plate 9 is set to promote portable connection.
Input shaft 2 and output shaft 3 are separately mounted in the power transmission shaft of engineering truck, in the presence of spring 7, input shaft 2 rotating plate 5 and the driven disc 6 of output shaft 3 are connected with each other, so that the power transmission shaft of engineering truck plays transmission work as overall With when needing engineering truck to need parking braking, making highly pressurised liquid act on piston 4, make 5 He of rotating plate of input shaft 2 The driven disc 6 of output shaft 3 is separated, so that the power transmission shaft separation of engineering truck can not play gearing.
The present invention has lower feature:
1st, due to devising clutch brake, the power transmission shaft of engineering truck is made in connection or to separate by clutch brake State, is lowered the temperature to clutch brake by the fluid of the torque converter of engineering truck, does not use drum-type and disc type central authorities Holding brake device, therefore improves the unfailing performance of central parking braking device.
2nd, due to devising housing 1, input shaft 2, output shaft 3, piston 4, rotating plate 5, driven disc 6, spring 7, connection method Blue disk 8 and pressing plate 9, by spring 7 and piston 4, meet the performance of clutch brake.
3rd, due to devising rotating plate 5 and driven disc 6, by brake(-holder) block made of paper, engineering truck is met in special operation condition Safety need.
4th, as mounting flange 8 is devised, connected by the semi-flexible formula of mounting flange 8, improve engineering truck Power transmission shaft exercise performance.
5th, due to devising the technical characteristic of the present invention, the effect of set in the independent of technical characteristic and each other, Shown by test, the property indices of the present invention are at least 1.7 times of existing property indices, have by assessment There is good market value.
Also other clutch brakes with the power transmission shaft for making engineering truck in connection or released state identical or Akin technical characteristic is all one of embodiments of the invention, and each technical characteristic of embodiment described above can be carried out Arbitrary combine, be the requirement for meeting Patent Law, patent regulation and guidelines for examination, no longer to each in above-described embodiment The embodiment of all possible combination of technical characteristic is all described.
Therefore for colliery engineering vehicle central parking braking device technical field in, every include be arranged on work Clutch brake in the power transmission shaft of journey vehicle, the fluid being provided with clutch brake with the torque converter of engineering truck The technology contents of the cooling port being connected are all within the scope of the present invention.

Claims (10)

1. a kind of central parking braking device for colliery engineering vehicle, is characterized in that:Include and be arranged on engineering truck Clutch brake in power transmission shaft, is provided with clutch brake and is connected with the fluid of the torque converter of engineering truck Cooling port.
2. the central parking braking device for colliery engineering vehicle according to claim 1, is characterized in that:According to making work The power transmission shaft of journey vehicle is in connection or the technical characteristic of the mode set clutch brake of released state.
3. the central parking braking device for colliery engineering vehicle according to claim 1, is characterized in that:Disengaging type system Dynamic device is set to include housing(1), input shaft(2), output shaft(3), piston(4), rotating plate(5), driven disc(6), spring (7), mounting flange(8)And pressing plate(9), in input shaft(2)One end end face portion be provided with mounting flange(8)And defeated Enter axle(2)Other end end face portion be provided with rotating plate(5), in output shaft(3)Other end end face portion be provided with adpting flange Disk(8)And in output shaft(3)One end end face portion be provided with driven disc(6), in housing(1)In be provided with main cavity and Housing(1)Main chamber body side surface be provided with pay a cavity, input shaft(2)And output shaft(3)It is arranged on housing(1)Main cavity two End end face portion and rotating plate(5)And driven disc(6)It is arranged on housing(1)Main cavity in, rotating plate(5)And driven disc(6) It is set to interlaced arranged distribution and the rotating plate in outer end end face(5)And driven disc(6)On be respectively arranged with pressing plate (9), in housing(1)Pay cavity in be provided with piston(4)And piston(4)An end face portion be set to and pressing plate(9)Connect Touch couples, in pressing plate(9)With housing(1)Side wall between be provided with spring(7).
4. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Housing(1) It is set to box-shaped body and in housing(1)On be provided with and housing(1)Main cavity connection cooling port, in housing(1)On It is provided with and housing(1)Pay cavity connection highly pressurised liquid port and housing(1)Cooling port be set to and engineering truck The fluid of torque converter be connected.
5. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Input shaft (2)And output shaft(3)It is respectively set to axis body and input shaft(2)And output shaft(3)It is respectively set to by bearing and shell Body(1)Connection.
6. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Piston(4) It is set to L-shaped body and piston(4)One end end face portion be set to the driven disc with outer end end face(6)The pressing plate of connection(9) Contact couples.
7. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Rotating plate (5)And driven disc(6)It is set to brake(-holder) block made of paper and driven disc(6)It is arranged on adjacent two rotating plate(5)Between, actively Piece(5)It is arranged on adjacent two driven disc(6)Between.
8. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Spring(7) It is set to be embedded in housing(1)Side wall on and spring(7)The driven disc being set to outer end end face(6)The pressing plate of connection (9)Contact couples.
9. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Pressing plate(9) It is set to discoid body and pressing plate(9)It is respectively set to and rotating plate(5)And driven disc(6)Connection.
10. the central parking braking device for colliery engineering vehicle according to claim 3, is characterized in that:Housing(1) Centrage, input shaft(2)Centrage, output shaft(3)Centrage, rotating plate(5)Centrage, driven disc(6)In Heart line, mounting flange(8)Centrage and pressing plate(9)Centrage be arranged on same straight line and input shaft(2)'s Rotating plate(5)And output shaft(3)Driven disc(6)It is set to the connection of mutual CONTACT WITH FRICTION formula, piston(4)And spring(7)With pressure Plate(9)It is set to promote portable connection.
CN201610715779.4A 2016-08-25 2016-08-25 Central parking brake device for coal mine engineering vehicle Pending CN106438767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610715779.4A CN106438767A (en) 2016-08-25 2016-08-25 Central parking brake device for coal mine engineering vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610715779.4A CN106438767A (en) 2016-08-25 2016-08-25 Central parking brake device for coal mine engineering vehicle

Publications (1)

Publication Number Publication Date
CN106438767A true CN106438767A (en) 2017-02-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610715779.4A Pending CN106438767A (en) 2016-08-25 2016-08-25 Central parking brake device for coal mine engineering vehicle

Country Status (1)

Country Link
CN (1) CN106438767A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107191513A (en) * 2017-04-01 2017-09-22 重庆电子工程职业学院 New-energy automobile gear box hydraulic formula brake apparatus
CN107939864A (en) * 2017-12-26 2018-04-20 徐州科源液压股份有限公司 Pneumatic parking brake

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2065696U (en) * 1990-04-06 1990-11-14 瓦房店轴承厂 Hydraulic clutch
CN2769601Y (en) * 2004-12-27 2006-04-05 煤炭科学研究总院太原分院 Brake for coal mine underwell railless rubber tyre cart
CN101659252A (en) * 2009-09-19 2010-03-03 煤炭科学研究总院太原研究院 Brake with cooling in driving axle of battery forklift
JP4619336B2 (en) * 2006-08-29 2011-01-26 Tcm株式会社 Parking brake release device
CN102537142A (en) * 2010-12-23 2012-07-04 泸州邦立减速机有限责任公司 Travelling speed reducer brake for travel braking
CN102979838A (en) * 2012-11-30 2013-03-20 江苏昌达车辆有限公司 Wet brake for parking of explosion-proof transport vehicle
CN103375515A (en) * 2012-04-13 2013-10-30 上海宇意机械有限公司 Service and parking linked multi-disc wet hydraulic brake
CN103807317A (en) * 2012-11-13 2014-05-21 宁波北仑中瑞液压有限公司 Hydraulic clutch device
CN204878451U (en) * 2015-05-29 2015-12-16 徐州重型机械有限公司 Friction disc compresses tightly for stopper, separating mechanism and use hoist of this mechanism
CN205918796U (en) * 2016-08-25 2017-02-01 肥城众力机械有限公司 A central parking braking device for colliery engineering vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2065696U (en) * 1990-04-06 1990-11-14 瓦房店轴承厂 Hydraulic clutch
CN2769601Y (en) * 2004-12-27 2006-04-05 煤炭科学研究总院太原分院 Brake for coal mine underwell railless rubber tyre cart
JP4619336B2 (en) * 2006-08-29 2011-01-26 Tcm株式会社 Parking brake release device
CN101659252A (en) * 2009-09-19 2010-03-03 煤炭科学研究总院太原研究院 Brake with cooling in driving axle of battery forklift
CN102537142A (en) * 2010-12-23 2012-07-04 泸州邦立减速机有限责任公司 Travelling speed reducer brake for travel braking
CN103375515A (en) * 2012-04-13 2013-10-30 上海宇意机械有限公司 Service and parking linked multi-disc wet hydraulic brake
CN103807317A (en) * 2012-11-13 2014-05-21 宁波北仑中瑞液压有限公司 Hydraulic clutch device
CN102979838A (en) * 2012-11-30 2013-03-20 江苏昌达车辆有限公司 Wet brake for parking of explosion-proof transport vehicle
CN204878451U (en) * 2015-05-29 2015-12-16 徐州重型机械有限公司 Friction disc compresses tightly for stopper, separating mechanism and use hoist of this mechanism
CN205918796U (en) * 2016-08-25 2017-02-01 肥城众力机械有限公司 A central parking braking device for colliery engineering vehicle

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* Cited by examiner, † Cited by third party
Title
杭州汽车摩擦材料研究所: "《摩擦材料文集(下册)》", 31 October 1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107191513A (en) * 2017-04-01 2017-09-22 重庆电子工程职业学院 New-energy automobile gear box hydraulic formula brake apparatus
CN107939864A (en) * 2017-12-26 2018-04-20 徐州科源液压股份有限公司 Pneumatic parking brake
CN107939864B (en) * 2017-12-26 2024-01-30 徐州科源液压股份有限公司 Pneumatic parking brake

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Application publication date: 20170222