CN114251392A - Speed changing box brake device of snow throwing vehicle - Google Patents

Speed changing box brake device of snow throwing vehicle Download PDF

Info

Publication number
CN114251392A
CN114251392A CN202111609744.XA CN202111609744A CN114251392A CN 114251392 A CN114251392 A CN 114251392A CN 202111609744 A CN202111609744 A CN 202111609744A CN 114251392 A CN114251392 A CN 114251392A
Authority
CN
China
Prior art keywords
gearbox
brake
pneumatic
air
electromagnetic valve
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.)
Withdrawn
Application number
CN202111609744.XA
Other languages
Chinese (zh)
Inventor
邱翰健
李旭俊
唐毅林
蒋春玲
薛志敏
陈泳松
杨建华
莫玉振
陆地
何冬妮
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.)
Sinotruk Liuzhou Yunli Kodiak Machinery Co ltd
Original Assignee
Sinotruk Liuzhou Yunli Kodiak 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 Sinotruk Liuzhou Yunli Kodiak Machinery Co ltd filed Critical Sinotruk Liuzhou Yunli Kodiak Machinery Co ltd
Priority to CN202111609744.XA priority Critical patent/CN114251392A/en
Publication of CN114251392A publication Critical patent/CN114251392A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
    • E01H5/04—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material
    • E01H5/08—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by driven elements
    • E01H5/09—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by driven elements the elements being rotary or moving along a closed circular path, e.g. rotary cutter, digging wheels
    • 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
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
    • 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
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • 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
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • 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
    • 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

Landscapes

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

Abstract

The invention discloses a gear box braking device of a snow throwing vehicle, and relates to the technical field of snow removing equipment; the pneumatic brake comprises a brake disc and a pneumatic brake, wherein a pair of friction plates of the pneumatic brake are arranged on two sides of the brake disc, the brake disc is connected with an output flange of a gearbox through a connecting flange, the pneumatic brake is connected with an air source through an air pipe, a pneumatic electromagnetic valve is arranged on the air pipe to control the on-off of an air passage, and the on-off of the pneumatic electromagnetic valve is controlled by a relay; the coil of the relay is connected between the neutral gear switch of the gearbox and the ground, one end of a contact of the relay is connected with a power supply through a fuse, the other end of the contact is connected with a circuit inlet of the pneumatic electromagnetic valve, and a circuit outlet of the pneumatic electromagnetic valve is grounded. Compared with the prior art, the invention can solve the problem that the output shaft rotates when the gearbox is in neutral when the load of the output end of the gearbox of the snow throwing vehicle is very small.

Description

Speed changing box brake device of snow throwing vehicle
Technical Field
The invention relates to the technical field of snow removing equipment, in particular to a gearbox braking device of a snow throwing vehicle.
Background
In a snow throwing vehicle, a manual transmission is generally selected as a power output device for snow throwing work, and a power transmission path is shown in fig. 1, namely an engine 101 → a clutch → a transmission 102 → a transmission shaft 103 → a snow throwing head 104. At present, in order to improve the gear shifting smoothness of the gearbox 102, a synchronizer structure is generally adopted to replace a middle shaft braking structure of the gearbox 102, and the synchronizer structure has the problems that when the engine 101 runs and a clutch is engaged, if the load of the output end of the gearbox 102 is small, even if the gearbox 102 is in a neutral gear, an output shaft can rotate. When the snow throwing vehicle is in non-snow-removing operation working conditions such as equipment debugging, operation inspection and the like, because the load of the snow throwing head 104 is very small, the condition that the output shaft rotates when the gearbox 102 is in a neutral position exists, the output shaft can drive the auger 105 of the snow throwing head 104 to rotate through the transmission shaft 103, if operators are not careful, the danger of mechanical injury can exist, and production safety accidents are easily caused.
Disclosure of Invention
The invention aims to provide a braking device for a gearbox of a snow throwing vehicle, which can solve the problem that when the load of the output end of the gearbox of the snow throwing vehicle is small, an output shaft rotates when the gearbox is in a neutral position.
In order to solve the problems, the invention adopts the technical scheme that: the snow throwing vehicle gearbox braking device comprises a brake disc and an air compression brake, wherein a pair of friction plates of the air compression brake are arranged on two sides of the brake disc, the brake disc is connected with an output flange of a gearbox through a connecting flange, the air compression brake is connected with an air source through an air pipe, a pneumatic electromagnetic valve is arranged on the air pipe to control the on-off of an air passage, and the pneumatic electromagnetic valve controls the on-off of a circuit through a relay; the coil of the relay is connected between the neutral gear switch of the gearbox and the ground, one end of a contact of the relay is connected with a power supply through a fuse, the other end of the contact is connected with a circuit inlet of the pneumatic electromagnetic valve, and a circuit outlet of the pneumatic electromagnetic valve is grounded.
In the above technical solution, a more specific technical solution may also be: the pneumatic electromagnetic valve is also provided with an air inlet, a working port and an air outlet, the air inlet of the pneumatic electromagnetic valve is connected with the air source through the air pipe, and the working port of the pneumatic electromagnetic valve is connected with the air inlet of the air pressure brake through the air pipe.
Further, the air pressure brake is connected with the shell of the gearbox through a connecting piece.
Further, the connecting piece is a connecting bolt.
Further, the air source is an air cylinder.
Furthermore, the brake disc and the friction plate are both made of wear-resistant materials, and the hardness of the material of the brake disc is greater than that of the material of the friction plate.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the invention, the air brake is arranged on the shell of the gearbox, the brake disc is arranged on the output flange of the gearbox, the pneumatic electromagnetic valve is used for controlling the on-off of the air path between the air brake and the air source, and the neutral gear signal of the gearbox is read from the neutral gear switch of the gearbox and is used as the control signal of the pneumatic electromagnetic valve, so that the invention can realize that when the gearbox is in neutral gear, the air brake automatically brakes, the output shaft of the gearbox stops rotating, the operator can safely carry out equipment debugging and operation inspection, when the gearbox is in non-neutral gear, the air brake automatically releases braking, the output shaft of the gearbox can freely rotate, and the equipment can normally operate.
Drawings
FIG. 1 is a schematic diagram of a snowplow power transmission path;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a control circuit diagram of the pneumatic solenoid valve.
Detailed Description
The invention will be further described in detail with reference to the following examples:
the snow throwing vehicle gearbox braking device shown in fig. 2 and 3 comprises a brake disc 1 and an air compression brake 2, wherein a pair of friction plates 2-1 of the air compression brake 2 are arranged on two sides of the brake disc 1, the brake disc 1 is connected with an output flange of a gearbox 4 through a connecting flange 3, the air compression brake 2 is connected with an air source through an air pipe, a pneumatic electromagnetic valve 5 is arranged on the air pipe to control the on-off of an air path, and the pneumatic electromagnetic valve 5 controls the on-off of a circuit through a relay 6; a coil of the relay 6 is connected between the neutral switch 7 of the gearbox and the ground, one end of a contact of the relay 6 is connected with a power supply 9 through a fuse 8, the other end of the contact is connected with a circuit inlet of the pneumatic electromagnetic valve 5, and a circuit outlet of the pneumatic electromagnetic valve 5 is grounded.
The pneumatic electromagnetic valve 5 is also provided with an air inlet, a working port and an air outlet, the air inlet of the pneumatic electromagnetic valve 5 is connected with an air source through an air pipe, and the working port of the pneumatic electromagnetic valve 5 is connected with the air inlet of the air brake 2 through the air pipe.
The air brake 2 is connected with a shell of the gearbox 4 through a connecting piece; the connecting piece is a connecting bolt. The air source is an air cylinder. The brake disc 1 and the friction plate 2-1 are both made of wear-resistant materials, and the hardness of the material of the brake disc 1 is greater than that of the material of the friction plate 2-1.
The working principle of the invention is as follows: when the gearbox 4 is in a neutral state, the neutral switch 7 of the gearbox outputs high level, the coil of the relay 6 is electrified, the contact is closed, the pneumatic electromagnetic valve 5 is electrified to work, the air inlet and the working port of the pneumatic electromagnetic valve 5 are conducted, compressed air enters the pneumatic brake 2 from the air storage cylinder through the air pipe and the pneumatic electromagnetic valve 5, and the pneumatic brake 2 brakes to limit the rotation of the output shaft of the gearbox; when the gearbox 4 is in a non-neutral state, the neutral switch 7 of the gearbox outputs a low level, the coil of the relay 6 is powered off, the contact is opened, the pneumatic electromagnetic valve 5 is powered off, compressed air in the pneumatic brake 2 is exhausted through the exhaust port of the pneumatic electromagnetic valve 5, and the pneumatic brake 2 releases braking.
According to the invention, the air brake 2 is arranged on the shell of the gearbox 4, the brake disc is arranged on the output flange of the gearbox 4, the pneumatic solenoid valve 5 is used for controlling the on-off of the air path between the air brake 2 and the air source, and the gearbox neutral signal is read from the gearbox neutral switch 7 and is used as the control signal of the pneumatic solenoid valve 5, so that the automatic braking of the air brake 2 can be realized when the gearbox 4 is in neutral, the output shaft of the gearbox stops rotating, an operator can safely carry out equipment debugging and operation inspection, when the gearbox 4 is in non-neutral, the air brake 2 automatically releases the braking, the output shaft of the gearbox can freely rotate, and the equipment can normally operate.
The brake disc 1 and the friction plate 2-1 are made of wear-resistant materials, the service cycle of the braking device is prolonged, the hardness of the material of the brake disc 1 is greater than that of the material of the friction plate 2-1, so that the brake disc 1 is more wear-resistant relative to the friction plate 2-1, after the air brake 2 is worn, only the friction plate 2-1 needs to be replaced, and the maintenance is convenient.

Claims (6)

1. The utility model provides a snow throwing car gearbox arresting gear which characterized in that: the pneumatic brake comprises a brake disc and a pneumatic brake, wherein a pair of friction plates of the pneumatic brake are arranged on two sides of the brake disc, the brake disc is connected with an output flange of a gearbox through a connecting flange, the pneumatic brake is connected with an air source through an air pipe, a pneumatic solenoid valve is arranged on the air pipe to control the on-off of an air passage, and the on-off of the pneumatic solenoid valve is controlled by a relay; the coil of the relay is connected between the neutral gear switch of the gearbox and the ground, one end of a contact of the relay is connected with a power supply through a fuse, the other end of the contact is connected with a circuit inlet of the pneumatic electromagnetic valve, and a circuit outlet of the pneumatic electromagnetic valve is grounded.
2. The snowplow gearbox brake assembly of claim 1, wherein: the pneumatic electromagnetic valve is also provided with an air inlet, a working port and an air outlet, the air inlet of the pneumatic electromagnetic valve is connected with the air source through the air pipe, and the working port of the pneumatic electromagnetic valve is connected with the air inlet of the air pressure brake through the air pipe.
3. A snow thrower gearbox braking device as claimed in claim 1 or 2, characterised in that: the air pressure brake is connected with the shell of the gearbox through a connecting piece.
4. A snow thrower gearbox brake as claimed in claim 3, characterised in that: the connecting piece is a connecting bolt.
5. The snowplow gearbox brake assembly of claim 4, wherein: the air source is an air cylinder.
6. The snowplow gearbox brake assembly of claim 5, wherein: the brake disc and the friction plate are both made of wear-resistant materials, and the material hardness of the brake disc is larger than that of the friction plate.
CN202111609744.XA 2021-12-27 2021-12-27 Speed changing box brake device of snow throwing vehicle Withdrawn CN114251392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111609744.XA CN114251392A (en) 2021-12-27 2021-12-27 Speed changing box brake device of snow throwing vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111609744.XA CN114251392A (en) 2021-12-27 2021-12-27 Speed changing box brake device of snow throwing vehicle

Publications (1)

Publication Number Publication Date
CN114251392A true CN114251392A (en) 2022-03-29

Family

ID=80797958

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111609744.XA Withdrawn CN114251392A (en) 2021-12-27 2021-12-27 Speed changing box brake device of snow throwing vehicle

Country Status (1)

Country Link
CN (1) CN114251392A (en)

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403674A (en) * 1976-01-02 1983-09-13 Viall Sr Charles S Vehicle safety braking system
JPH08253130A (en) * 1995-03-15 1996-10-01 Mitsubishi Motors Corp Parking brake safety device
JPH1016813A (en) * 1996-06-27 1998-01-20 Yanmar Agricult Equip Co Ltd Operating device for combine
KR19980048048A (en) * 1996-12-17 1998-09-15 양재신 Parking brake system of car using pneumatic
JP2000170911A (en) * 1998-12-09 2000-06-23 Nippon Soken Inc Parking device of automatic transmission
JP2001225732A (en) * 2000-02-15 2001-08-21 Mitsubishi Motors Corp Electronically controlled brake device for vehicle
JP2001248126A (en) * 2000-03-01 2001-09-14 Honda Motor Co Ltd Power transmission device for snowplow
US6484497B1 (en) * 2000-02-24 2002-11-26 Tecumseh Products Company Neutral brake
JP2003095077A (en) * 2001-09-20 2003-04-03 Nippon Sharyo Seizo Kaisha Ltd Erroneous start prevention device of tank lorry
JP2007139155A (en) * 2005-11-22 2007-06-07 Toyota Motor Corp Control device for automatic transmission
JP2007196703A (en) * 2006-01-23 2007-08-09 Toyota Industries Corp Control device of industrial vehicle
CN101589250A (en) * 2006-12-13 2009-11-25 丰田自动车株式会社 Hydraulic control system and method for automatic transmission for a vehicle
CN102128064A (en) * 2011-03-29 2011-07-20 刘冬生 Vehicle engine braking system and control circuit thereof
JP2014020442A (en) * 2012-07-17 2014-02-03 Aisin Aw Co Ltd Hydraulic control device
CN103930320A (en) * 2011-08-25 2014-07-16 SMMotors株式会社 Safety braking apparatus for an automated vehicle
CN203868186U (en) * 2014-05-16 2014-10-08 陕西法士特齿轮有限责任公司 Side brake for AMT (automated mechanical transmission)
CN104442752A (en) * 2014-12-22 2015-03-25 江苏柳工机械有限公司 Braking power cut-off control system of walking machine
JP2016067215A (en) * 2014-09-26 2016-05-09 井関農機株式会社 Walking type seedling transplanter
US20200290699A1 (en) * 2019-03-12 2020-09-17 Honda Motor Co., Ltd. Parking brake apparatus for saddled vehicle

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4403674A (en) * 1976-01-02 1983-09-13 Viall Sr Charles S Vehicle safety braking system
JPH08253130A (en) * 1995-03-15 1996-10-01 Mitsubishi Motors Corp Parking brake safety device
JPH1016813A (en) * 1996-06-27 1998-01-20 Yanmar Agricult Equip Co Ltd Operating device for combine
KR19980048048A (en) * 1996-12-17 1998-09-15 양재신 Parking brake system of car using pneumatic
JP2000170911A (en) * 1998-12-09 2000-06-23 Nippon Soken Inc Parking device of automatic transmission
JP2001225732A (en) * 2000-02-15 2001-08-21 Mitsubishi Motors Corp Electronically controlled brake device for vehicle
US6484497B1 (en) * 2000-02-24 2002-11-26 Tecumseh Products Company Neutral brake
JP2001248126A (en) * 2000-03-01 2001-09-14 Honda Motor Co Ltd Power transmission device for snowplow
JP2003095077A (en) * 2001-09-20 2003-04-03 Nippon Sharyo Seizo Kaisha Ltd Erroneous start prevention device of tank lorry
JP2007139155A (en) * 2005-11-22 2007-06-07 Toyota Motor Corp Control device for automatic transmission
JP2007196703A (en) * 2006-01-23 2007-08-09 Toyota Industries Corp Control device of industrial vehicle
CN101589250A (en) * 2006-12-13 2009-11-25 丰田自动车株式会社 Hydraulic control system and method for automatic transmission for a vehicle
CN102128064A (en) * 2011-03-29 2011-07-20 刘冬生 Vehicle engine braking system and control circuit thereof
CN103930320A (en) * 2011-08-25 2014-07-16 SMMotors株式会社 Safety braking apparatus for an automated vehicle
JP2014020442A (en) * 2012-07-17 2014-02-03 Aisin Aw Co Ltd Hydraulic control device
CN203868186U (en) * 2014-05-16 2014-10-08 陕西法士特齿轮有限责任公司 Side brake for AMT (automated mechanical transmission)
JP2016067215A (en) * 2014-09-26 2016-05-09 井関農機株式会社 Walking type seedling transplanter
CN104442752A (en) * 2014-12-22 2015-03-25 江苏柳工机械有限公司 Braking power cut-off control system of walking machine
US20200290699A1 (en) * 2019-03-12 2020-09-17 Honda Motor Co., Ltd. Parking brake apparatus for saddled vehicle

Similar Documents

Publication Publication Date Title
CN201058603Y (en) Loader hydraulic wet braking system
CN108946547A (en) The method with release descending mechanism is promoted by intelligent winding plant
CN216789057U (en) Gear box braking device of snow throwing vehicle
CN114251392A (en) Speed changing box brake device of snow throwing vehicle
CN103522995A (en) Roof steering follow-up air resistance retarder
CN106704499B (en) Star-like dry friction brake type automatic planet arrangement of clutch
CN104091197B (en) Electromagnetic relay closes number of times recording method and device, compression release braking circuit
CN206487838U (en) Star-like dry friction brake type automatic planet arrangement of clutch
CN204355027U (en) The brake power cutting-off controlling system of walking machine
CN104442752A (en) Braking power cut-off control system of walking machine
WO2022121811A1 (en) Hydraulic brake having scrape piece-type hydraulic pump with scrape piece recovery device
CN205396058U (en) Vehicle downhill path energy is collected and is utilized device
CN203770482U (en) Clutch brake
CN201165229Y (en) Lorry-mounted crane auxiliary braking device
CN203548643U (en) Hydraulic coupling-type retarder
CN207345785U (en) A kind of intelligent pneumatic power braking system of mining electric locomotive
CN203500332U (en) Double-cavity fluid power decelerating device integrated on bottom of engine
CN208605525U (en) A kind of Pneumatic and hydraulic liquid power retarder
CN201466577U (en) Trailer-type 380KN traction machine
CN206465946U (en) Pneumatic rail clamping type brake
CN202481689U (en) Hydro-viscous controllable start and brake integrated device for belt conveyor
CN206845737U (en) Large-scale track maintenance vehicles transmit disengaging gear with gearbox dynamic
CN101240824A (en) Energy-storing and releasing device for braking
CN210715652U (en) Pedal type hydraulic brake
CN109927758A (en) Solid rim lubricating device and lubricating method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20220329

WW01 Invention patent application withdrawn after publication