CN114261421B - Hydraulic transmission manual release auxiliary mechanism and method for parking brake cylinder - Google Patents
Hydraulic transmission manual release auxiliary mechanism and method for parking brake cylinder Download PDFInfo
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- CN114261421B CN114261421B CN202111366060.1A CN202111366060A CN114261421B CN 114261421 B CN114261421 B CN 114261421B CN 202111366060 A CN202111366060 A CN 202111366060A CN 114261421 B CN114261421 B CN 114261421B
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Abstract
The invention discloses a hydraulic transmission manual relieving auxiliary mechanism and method for a parking brake cylinder, and the hydraulic transmission manual relieving auxiliary mechanism comprises a relieving handle (6) with one end hinged on a fixed mounting bracket, and is characterized in that an active oil cylinder assembly (5), an execution oil cylinder assembly (4) and a wedge block (3) are sequentially connected onto the relieving handle, the wedge block is provided with a working inclined plane, a ratchet pin (10) for manual relieving is hung on the working inclined plane, the ratchet pin is hung at the lower end of the working inclined plane in an initial state, and the wedge block moves under the action of hydraulic force provided by the active oil cylinder assembly (5) and the execution oil cylinder assembly (4) when manual relieving is executed, so that the ratchet pin moves upwards along the working inclined plane to realize manual relieving. According to the manual release device, hydraulic oil is used as a force transmission medium for manual release, so that the reliability of the whole manual release device is improved, the working efficiency is improved, and the labor intensity of an operator is reduced.
Description
Technical Field
The invention relates to basic braking of a rail transit vehicle braking system, in particular to a hydraulic transmission manual release auxiliary mechanism and method for a parking brake cylinder.
Background
The brake system is one of key systems of rail transit rolling stocks, and the parking brake cylinder is an important component of a basic brake device of the rolling stock brake system and is used for realizing long-term safe parking of the rolling stock on a slope. When the rolling stock is out of power or windless, the parking brake needs to be manually relieved. The first scheme is that a pull ring is directly connected with a ratchet pin of a manual relieving device, and parking relieving is realized by pulling the pull ring; the second method is to use a hand release cord, that is, as shown in fig. 1, a release handle a is provided at the distal end, and the pulling force of the release handle a is transmitted to a ratchet pin C by a wire rope B. The first solution is simple in structure, but is easily hidden by other parts of the bogie, and is not suitable for some bogies. Although the second scheme solves the problem that the first scheme is easy to be shielded, the second scheme has requirements on both the bending angle and the curvature radius of the steel wire rope, for example, the bending angle of the steel wire rope in fig. 1 is not less than 90 degrees, and the curvature radius is not less than R100. When the bending angle or radius of curvature is too small, it results in too much frictional resistance of the cable against its protective sleeve, making manual relief difficult.
Disclosure of Invention
The invention aims to solve the technical problem that the manual release auxiliary mechanism and the method for the hydraulic transmission parking brake cylinder are easier to complete and more reliable, and the pipeline arrangement is more flexible, aiming at the defect that the conventional manual release pull rope has higher requirements on the bending angle and the curvature radius of a steel wire rope, and when the bending angle or the curvature radius is too small, the friction resistance between the steel wire rope and a protective sleeve of the steel wire rope is too large, so that the manual release is difficult to realize.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a manual complementary unit of alleviating of hydraulic drive's parking brake jar, includes that one end articulates the handle of alleviating on the fixed mounting support, it constitutes, carries out hydro-cylinder and constitutes and the voussoir to connect gradually the initiative hydro-cylinder on the handle of alleviating, the voussoir has a work inclined plane, the last ratchet round pin that hangs that is used for manual alleviating of work inclined plane, during initial state, the ratchet round pin is hung the lower extreme on work inclined plane carries out when manual alleviating, the voussoir is in the hydraulic force effect that the initiative hydro-cylinder is constituteed, is carried out the hydro-cylinder and is constituteed the removal that provides makes the ratchet round pin is followed work inclined plane is gone upward and is realized manual alleviating.
The hydraulic transmission mechanism is adopted to replace the existing release pull rope mechanism, and the structural principle of other parts of the manual release device is consistent with that of the existing manual release device. Therefore, on one hand, the invention inherits the advantages of the existing hand release pull rope; on the other hand, because the flow resistance of liquid in the pipeline is far less than the sliding friction force between the steel wire rope and the inner wall of the sleeve, the manual relieving operation is easier to complete, the reliability of the whole manual relieving device is improved, the labor intensity of an operator is greatly reduced, the oil pipe can allow smaller curvature radius and bending angle, the installation requirement is reduced, and the pipeline arrangement is more flexible.
Specifically, the initiative hydro-cylinder is constituteed including initiative hydro-cylinder body, initiative piston and initiative hydro-cylinder lid, initiative hydro-cylinder body upper cover is established the initiative hydro-cylinder lid, install in the effect chamber of initiative hydro-cylinder body the one end of initiative piston, the other end of initiative piston stretches out the initiative hydro-cylinder body is connected alleviate the handle, the effect chamber is provided with the oil filler point of being connected with the hydraulic pressure source and is used for providing the oil pressure delivery outlet of pressurization hydraulic oil.
Preferably, the driving oil cylinder assembly further comprises a spring guide pad and a driving piston return spring, the spring guide pad is installed at one end of the action cavity, and the driving piston return spring is installed between the spring guide pad and the driving piston. When the release handle is released, the active piston and the release handle return to the initial position under the action of the active piston return spring.
Preferably, the oil pressure output hole is arranged close to the spring guide pad, and the oil injection hole is arranged close to the initial position of the driving piston, so that the oil pressure in the system is ensured to be established as soon as possible.
The executing cylinder comprises an executing cylinder body, an executing piston and an oil inlet, one end of the executing piston is installed in the executing cylinder body, the other end of the executing piston is connected with the wedge block, and the oil inlet is connected with the oil pressure output hole through an oil pipe.
Preferably, the wedge block is installed in the installation seat, one end of the cylinder body of the execution cylinder is fixedly connected with the installation seat, and a wedge block return spring is installed between the installation seat and the wedge block. When the release handle is released, the wedge block pushes the actuating piston to return to the initial position under the action of the wedge block return spring.
Preferably, a pin is installed between the wedge block and the installation seat, the wedge block return spring is sleeved on the pin, one end of the pin is fixedly connected with the installation seat, and the other end of the pin is installed on the wedge block in a clearance fit mode, so that the wedge block can be guided through the pin in the moving process.
Preferably, the other end of the actuator piston is provided as a spherical surface, and the actuator piston is in contact with the wedge through the spherical surface end, so that the small-amplitude deflection performance of the wedge and the actuator piston during movement can be adapted to the spherical surface when the manual release operation is performed, and clamping stagnation possibly caused during movement of the wedge is avoided.
Preferably, the work inclined plane includes from last first work inclined plane and the second work inclined plane that distributes in proper order down, just the contained angle of second work inclined plane and horizontal plane is compared the contained angle of first work inclined plane and horizontal plane is little. Therefore, the amplification factor of the second working inclined plane to the horizontal force is larger than that of the first working inclined plane to the horizontal force, the stage that static friction force needs to be overcome in the initial manual relieving stage is the most labor-consuming stage, and the second working inclined plane to the horizontal force is larger in amplification factor and can ensure that labor is saved in the initial manual relieving stage.
Based on the same inventive concept, the invention also provides an auxiliary relieving method of the hydraulic transmission manual brake cylinder relieving auxiliary mechanism, which comprises the following steps:
in the initial state, the release handle does not act, the active piston return spring is in a free state, the active piston is positioned at one end of an action cavity of the active oil cylinder body, and the whole system is filled with hydraulic oil through an oil injection hole;
when manual relieving is performed, an operator tightly holds a relieving handle with hands, and the relieving handle pushes a driving piston to establish oil pressure in an action cavity of a cylinder body of a driving oil cylinder; the oil pressure of the action cavity of the cylinder body of the driving oil cylinder is transmitted to the action cavity of the cylinder body of the execution oil cylinder through the oil pressure output hole, the execution piston and the wedge block are pushed, and the ratchet pin which is hung at the lower end of the second working inclined surface of the wedge block ascends along the second working inclined surface and the first working inclined surface of the wedge block and is pulled out to realize manual relieving of parking brake.
And the release handle is loosened, and the wedge block pushes the execution piston to return to the initial position under the action of the wedge block return spring. Synchronously, the active piston and the release handle return to the initial positions under the action of the active piston return spring.
When the release handle moves to a set position (release position), the travel switch is triggered, the normally open circuit is closed, and the high-level signal is sent to the train control system, so that the positions of the release handle, at which manual release operation is implemented, can be seen on the cab display screen.
The invention is provided with two oil paths which have the same structure and are independent from each other, can meet the requirement of the manual relieving function at two sides and do not influence each other.
Compared with the prior art, the invention has the beneficial effects that:
the hydraulic oil is used as a force transmission medium for manual release, so that the problem of large friction resistance between a steel wire rope and a sleeve in the conventional manual release pull rope can be solved, the parking brake can be quickly released under the condition that a rolling stock is not returned due to fire or other windless conditions, the reliability of the whole manual release device is improved, the working efficiency is improved, and the labor intensity of an operator is reduced.
In addition, the invention realizes the function of manually relieving the indication whether to be executed or not by combining the travel switch, is convenient for statistics and management and avoids omission.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions in the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a conventional manual brake cylinder release assist mechanism.
FIG. 2 is a schematic structural diagram of a hydraulic transmission manual brake cylinder release auxiliary mechanism of the present invention.
Figure 3 is an assembly view of the mounting block and wedge of the present invention.
FIG. 4 is a schematic structural view of the wedge of the present invention, wherein a is a front sectional view and b is a top view.
FIG. 5 isbase:Sub>A schematic structural diagram of an actuating cylinder assembly of the present invention, whereinbase:Sub>A isbase:Sub>A front view, b isbase:Sub>A right side view ofbase:Sub>A, and c isbase:Sub>A sectional view taken along line A-A ofbase:Sub>A.
FIG. 6 is a schematic diagram of the structure of the master cylinder according to the present invention.
In the figure: 1 denotes a wedge return spring, 2 denotes a mounting seat, 3 denotes a wedge, 4 denotes an actuating cylinder composition, 5 denotes a master cylinder composition, 6 denotes a release handle, 7 denotes a travel switch, 8 denotes an oil reservoir cup, 9 denotes a pin, 10 denotes a ratchet pin, 3-1 denotes a first working slope, 3-2 denotes a second working slope, 4-1 denotes an actuating cylinder body, 4-2 denotes an actuating piston, 4-3 denotes an O-ring mounting groove, 5-1 denotes a master cylinder body, 5-2 denotes a spring guide pad, 5-3 denotes a master piston return spring, 5-4 denotes a master piston, 5-5 denotes a master cylinder cover, 5-6 denotes an oil filler hole, and 5-7 denotes an oil pressure output hole.
Detailed Description
The invention is further described below with reference to specific preferred embodiments, without thereby limiting the scope of protection of the invention.
For convenience of description, the relative positional relationship of the components, such as: the descriptions of the upper, lower, left, right, etc. are described with reference to the layout directions of the drawings in the specification, and do not limit the structure of the present patent.
Referring to fig. 2, an embodiment of the hydraulic transmission manual release auxiliary mechanism for the parking brake cylinder of the invention comprises a wedge block return spring 1, a mounting seat 2, a wedge block 3, an execution oil cylinder assembly 4, a driving oil cylinder assembly 5, a release handle 6, a travel switch 7 and an oil storage cup 8.
Referring to fig. 3, the wedge return spring 1 is installed between the wedge 3 and the mounting seat 2, a pin 9 is inserted into the wedge return spring 1, and the pin 9 plays a role in guiding the wedge 3 and preventing the wedge return spring 1 from being unstable. The hexagonal head end of the pin 9 is provided with a section of thread, and the rest is a smooth cylindrical surface. The pin 9 is connected with the mounting seat 2 through threads, and the smooth cylindrical surface of the pin 9 passes through the through hole on the wedge 3 in a clearance fit manner, so that the wedge 3 can slide along the smooth cylindrical surface area of the pin 9 under the action of the oil pressure of the execution oil cylinder assembly 4.
Referring to fig. 4, the wedge 3 has a first working slope 3-1 and a second working slope 3-2 sequentially distributed from top to bottom, and the angle between the second working slope 3-2 and the horizontal plane is smaller than the angle between the first working slope 3-1 and the horizontal plane, so that the second working slope 3-2 amplifies the horizontal force more than the first working slope 3-1. As shown in fig. 3, before the manual release is started, the ratchet pin 10 is hooked at the lower end of the second working inclined surface 3-2 of the wedge 3, because the static friction force between the ratchet pin 10 and the wedge 3 needs to be overcome in the initial stage of the manual release, which is the most labor-consuming stage, and the second working inclined surface 3-2 has a larger amplification factor to the horizontal force, so that more labor is saved in the initial stage of the manual release.
Referring to fig. 5, the execution cylinder assembly 4 comprises an execution cylinder body 4-1, an execution piston 4-2, an O-shaped ring installation groove 4-3 and two oil inlets 4-4, wherein one end of the execution cylinder body 4-1 is provided with 4 through holes 4-5, the execution cylinder body 4-1 is connected with the installation seat 2 by penetrating 4 through holes 4-5 through 4 bolts, the execution piston 4-2 is inserted into an action cavity of the execution cylinder body 4-1 in a clearance fit manner, a sealing ring is installed between the execution piston 4-2 and the action cavity of the execution cylinder body 4-1, and the two oil inlets 4-4 are arranged on one side surface of the execution cylinder body 4-1 and are communicated with the action cavity of the execution cylinder body 4-1. The actuating end of the actuating piston 4-2 is connected with the wedge 3, and the actuating end of the actuating piston 4-2 is set to be a spherical surface 4-6 which is contacted with one end surface of the wedge 3 when manual relieving operation is executed, and the spherical surface can adapt to small-amplitude deflection when the wedge 3 and the actuating piston 4-2 move, so that clamping stagnation of the wedge 3 caused by the small-amplitude deflection can be avoided. The binding surface of the execution oil cylinder body 4-1 and the mounting seat 2 is sealed by an O-shaped ring, so as to play a role of dust prevention and water prevention, and the O-shaped ring is arranged in an O-shaped ring mounting groove 4-3 of the execution oil cylinder body 4-1.
Referring to fig. 6, the driving cylinder assembly 5 includes a driving cylinder body 5-1, a spring guide pad 5-2, a driving piston return spring 5-3, a driving piston 5-4, and a driving cylinder head 5-5. The spring guide pad 5-2, the driving piston return spring 5-3 and the inner end of the driving piston 5-4 are sequentially arranged in an action cavity of the driving oil cylinder body 5-1, and the outer end of the driving piston 5-4 is connected with the release handle 6. The driving oil cylinder cover 5-5 is in threaded connection with the driving oil cylinder body 5-1. The inner end surface of the driving oil cylinder cover 5-5 is contacted with the step surface of the driving piston 5-4, so that the driving piston 5-4 is prevented from falling off under the action of the pre-compression restoring force of the driving piston return spring 5-3. An oil filling hole 5-6 is formed in the driving oil cylinder body 5-1, one end of the oil filling hole 5-6 is communicated with an action cavity of the driving oil cylinder body 5-1, the other end of the oil filling hole 5-6 is directly connected with an oil storage cup 8, and oil is filled into the whole oil way through the oil storage cup 8 during new production or later maintenance. Meanwhile, the oil holes 5 to 6 also play a role of discharging air in the oil passage because the density of oil is much greater than that of air. An oil pressure output hole 5-7 is further formed in the driving oil cylinder body 5-1, one end of the oil pressure output hole 5-7 is communicated with an acting cavity of the driving oil cylinder body 5-1, the other end of the oil pressure output hole is directly connected with an oil inlet 4-4 of the execution oil cylinder assembly 4, oil pressure of the acting cavity of the driving oil cylinder body 5-1 is transmitted to the execution piston 4-2, and the execution piston 4-2 is pushed.
One end of the release handle 6 is hinged with the fixed mounting bracket, so that the release handle 6 can rotate around the hinged point.
When the manual relieving operation is not performed, the relative position of the driving piston 5-4 and the driving oil cylinder body 5-1 is shown in figure 6, and the oil storage cup 8 is communicated with the whole oil circuit through the oil filling hole 5-6.
When the manual relieving operation is executed, an operator holds the relieving handle 6 by hand, the relieving handle 6 pushes the driving piston 5-4 to move a small distance leftwards in the action cavity of the driving oil cylinder body 5-1, so that after a first sealing ring counted from left to right on the driving piston 5-4 completely passes through the oil injection hole 5-6, the oil pressure of the action cavity of the driving oil cylinder body 5-1 starts to be established. The oil pressure of an acting cavity of the driving oil cylinder body 5-1 is transmitted to an acting cavity of the executing oil cylinder body 4-1 through the oil pressure output hole 5-7, the oil pipe and the oil inlet 4-4, the executing piston 4-2 is pushed, meanwhile, the executing piston 4-2 pushes the wedge block 3 under the action of the oil pressure, and a ratchet pin which is hung at the lower end of the second working inclined surface 3-2 of the wedge block 3 moves upwards along the second working inclined surface 3-2 and the first working inclined surface 3-1 of the wedge block 3 to be pulled out to realize manual relieving of parking brake. When the release handle 6 moves to a set position, the travel switch 7 is triggered to close the normally open circuit and send the high level signal to the train control system, so that the operator cab can see which shaft positions are subjected to manual release operation on the display screen.
The release handle 6 is released, the wedge 3 is reset under the action of the wedge reset spring 1 and pushes the execution piston 4-2 to return to the initial position. Synchronously, the active piston 5-4 and the release handle 6 return to the initial position under the action of the active piston return spring 5-3.
The above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modify equivalent embodiments using the technical content disclosed above without departing from the technical solution of the present invention. Such as: a reversing mechanism (such as a lever) can be arranged at the position of the execution oil cylinder assembly 4 to change the movement of the pushing wedge block 3 into the movement of the pulling wedge block 3; the travel switch 7 can be triggered by the displacement of the release handle 6, and the travel switch 7 can also be triggered by the displacement of other parts, such as the wedge block 3; any electrical element that can convert a displacement into an electrical signal can perform the function of manually mitigating the indication of whether the operation is performed, and a travel switch is just one example.
Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (9)
1. The utility model provides a hydraulic drive's manual complementary unit of alleviating of brake cylinder of parking, includes that one end articulates alleviating handle (6) on the fixed mounting support, its characterized in that, it constitutes (5), execution hydro-cylinder group (4) and voussoir (3) to connect gradually the initiative hydro-cylinder on the alleviating handle, the voussoir has a work inclined plane, set up ratchet round pin (10) that are used for manual alleviating on the work inclined plane, during initial condition, the ratchet round pin is set up the lower extreme on work inclined plane, when carrying out manual alleviating, the voussoir is in the hydraulic pressure effect that initiative hydro-cylinder group (5), execution hydro-cylinder group (4) provided moves down, makes the ratchet round pin is followed work inclined plane goes upward realizes manual alleviating.
2. The hydraulically driven manual brake cylinder release assist mechanism for parking brake cylinders according to claim 1, wherein the master cylinder assembly comprises a master cylinder body (5-1), a master piston (5-4) and a master cylinder cover (5-5), the master cylinder body is covered with the master cylinder cover, one end of the master piston is installed in an action cavity of the master cylinder body, the other end of the master piston extends out of the master cylinder body and is connected with the release handle, and the action cavity is provided with an oil filling hole (5-6) connected with a hydraulic source and an oil pressure output hole (5-7) for providing pressurized hydraulic oil.
3. The hydraulically actuated parking brake cylinder manual mitigation assistance mechanism of claim 2, wherein the master cylinder assembly further comprises a spring guide pad (5-2) mounted at one end of the apply chamber, a master piston return spring (5-3) mounted between the spring guide pad and the master piston.
4. The hydraulically actuated manual park brake cylinder release assist mechanism according to claim 3 wherein the oil pressure output port is located proximate the spring guide pad and the oil filler port is located proximate the initial position of the master piston.
5. The hydraulically driven manual brake cylinder release assist mechanism for parking brake according to claim 2, wherein the actuating cylinder comprises an actuating cylinder body (4-1), an actuating piston (4-2) and an oil inlet (4-4), one end of the actuating piston is installed in the actuating cylinder body, the other end of the actuating piston is connected with the wedge block, and the oil inlet is connected with the oil pressure output hole through an oil pipe.
6. Hydraulic parking brake cylinder manual release assist mechanism according to claim 5, characterized in that the wedge is mounted in a mounting seat (2), one end of the actuator cylinder block is fixedly connected to the mounting seat, and a wedge return spring (1) is mounted between the mounting seat and the wedge.
7. The hydraulically driven manual brake cylinder release assist mechanism according to claim 6, wherein a pin (9) is installed between the wedge block and the mounting seat, the wedge block return spring is sleeved on the pin, one end of the pin is fixedly connected with the mounting seat, and the other end of the pin is installed on the wedge block in a clearance fit manner.
8. The hydraulically driven parking brake cylinder manual mitigation auxiliary mechanism of claim 5, wherein the other end of the actuator piston is provided as a spherical surface.
9. The hydraulically driven manual brake cylinder release assist mechanism according to claim 1, wherein the working ramps comprise a first working ramp (3-1) and a second working ramp (3-2) arranged in sequence from top to bottom, and the second working ramp has a smaller angle with the horizontal than the first working ramp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366060.1A CN114261421B (en) | 2021-11-18 | 2021-11-18 | Hydraulic transmission manual release auxiliary mechanism and method for parking brake cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111366060.1A CN114261421B (en) | 2021-11-18 | 2021-11-18 | Hydraulic transmission manual release auxiliary mechanism and method for parking brake cylinder |
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| Publication Number | Publication Date |
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| CN114261421A CN114261421A (en) | 2022-04-01 |
| CN114261421B true CN114261421B (en) | 2023-01-20 |
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| GB361894A (en) * | 1930-08-19 | 1931-11-19 | Matt Payne | Improvements in or relating to fluid pressure assisted braking mechanism |
| JP2002127902A (en) * | 2000-09-15 | 2002-05-09 | Westinghouse Air Brake Technologies Corp | Control apparatus for operating and releasing hand brake |
| DE60006590D1 (en) * | 2000-03-09 | 2003-12-18 | 55 Brake Co | SAFETY SYSTEM FOR A MOTOR VEHICLE BRAKE SYSTEM |
| CN104960514A (en) * | 2015-07-13 | 2015-10-07 | 青岛四方车辆研究所有限公司 | Passive hydraulic pressure braking system for railroad car |
| CN110979276A (en) * | 2019-12-28 | 2020-04-10 | 袁菊花 | Parking brake mechanism and gear mechanism linkage device of vehicle |
| CN111661102A (en) * | 2020-07-09 | 2020-09-15 | 冯思远 | Railway vehicle parking brake device |
| CN111923953A (en) * | 2020-08-06 | 2020-11-13 | 冯思远 | Railway vehicle parking brake device capable of stopping automatically and manually |
| CN213502299U (en) * | 2020-08-27 | 2021-06-22 | 中车长春轨道客车股份有限公司 | Novel parking braking auxiliary relieving control system for low-floor light rail vehicle |
-
2021
- 2021-11-18 CN CN202111366060.1A patent/CN114261421B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB361894A (en) * | 1930-08-19 | 1931-11-19 | Matt Payne | Improvements in or relating to fluid pressure assisted braking mechanism |
| DE60006590D1 (en) * | 2000-03-09 | 2003-12-18 | 55 Brake Co | SAFETY SYSTEM FOR A MOTOR VEHICLE BRAKE SYSTEM |
| JP2002127902A (en) * | 2000-09-15 | 2002-05-09 | Westinghouse Air Brake Technologies Corp | Control apparatus for operating and releasing hand brake |
| CN104960514A (en) * | 2015-07-13 | 2015-10-07 | 青岛四方车辆研究所有限公司 | Passive hydraulic pressure braking system for railroad car |
| CN110979276A (en) * | 2019-12-28 | 2020-04-10 | 袁菊花 | Parking brake mechanism and gear mechanism linkage device of vehicle |
| CN111661102A (en) * | 2020-07-09 | 2020-09-15 | 冯思远 | Railway vehicle parking brake device |
| CN111923953A (en) * | 2020-08-06 | 2020-11-13 | 冯思远 | Railway vehicle parking brake device capable of stopping automatically and manually |
| CN213502299U (en) * | 2020-08-27 | 2021-06-22 | 中车长春轨道客车股份有限公司 | Novel parking braking auxiliary relieving control system for low-floor light rail vehicle |
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