Automatic parking brake cylinder for railway vehicle

Abstract

The invention relates to the technical field of railway vehicle braking, and discloses an automatic parking brake cylinder for a railway vehicle, the automatic parking brake cylinder comprises a cylinder body, a cylinder cover and a parking shell, the cylinder body and the cylinder cover are detachably connected, the cylinder cover and the parking shell are detachably connected, a brake piston is slidably connected in the cylinder body, a piston rod is fixed on the brake piston, the end part of the piston rod is connected with a connecting part, and the connecting part is fixedly connected with the cylinder body. The front end of the connecting part is connected with a basic braking device, a braking air inlet used for pushing a braking piston to move is formed in the cylinder body and connected with a braking cylinder pipe, a parking locking device is arranged on the parking shell, and when a vehicle is braked and stopped, the braking cylinder pipe is connected with the braking air inlet under the action of the parking locking device. The stepless parking locking device has the braking and parking integrated function, stepless parking locking can be achieved, and no braking force loss exists after parking.

Description

Technical Field

[0001] This application relates to the technical field of railway vehicle braking, and particularly relates to an automatic parking brake cylinder for railway vehicles. Background Art

[0002] Currently, in order to ensure the safe parking of trains and prevent vehicle runaway, the anti-rolling measures taken by railway freight cars at home and abroad mainly include the traditional manual operation of vehicle hand brakes and placing anti-rolling shoes; in addition, there are also a small number of vehicles equipped with automatic parking devices on the market, using the automatic parking device to prevent rolling.

[0003] Manual anti-rolling operations have problems such as cumbersome operations, high labor intensity, and high danger. The automatic parking device, although it solves some of the above-mentioned problems of manual anti-rolling, the toothed locking structure adopted by this device belongs to stepped locking. After locking, there is a certain amount of backhaul, resulting in a certain loss of parking force. Moreover, there are large differences between each vehicle type, and the installation connection mechanism needs to be customized. The installation occupies a large space, the structure is complex, and the cost is relatively high. Summary of the Invention

[0004] In order to achieve the functions of service braking and automatic parking, this application provides an automatic parking brake cylinder for railway vehicles.

[0005] This application provides an automatic parking brake cylinder for railway vehicles, adopting the following technical solutions:

[0006] An automatic parking brake cylinder for railway vehicles includes a cylinder block, a cylinder head, and a parking housing. The cylinder block and the cylinder head, and the cylinder head and the parking housing are all detachably connected. A brake piston is slidably connected in the cylinder block. A piston rod is fixed on the brake piston. The end of the piston rod is connected with a connecting part. The front end of the connecting part is connected with the basic braking device. A brake air inlet for pushing the brake piston to move is provided on the cylinder block. The brake air inlet is connected with a brake cylinder pipe. A parking locking device for preventing the braking force from decreasing due to air leakage of the brake cylinder is arranged on the parking housing.

[0007] By adopting the above technical solutions, when the vehicle brakes, the braking air pressure at the brake cylinder air inlet pushes the brake piston to drive the piston rod and the connecting part connected to the piston rod to move. The connecting part acts on the basic braking device on the vehicle body to realize vehicle braking and parking. At this time, when the vehicle needs to park, in order to prevent the piston rod from retracting, only the main brake pipe needs to be emptied. Under the action of the parking spring, the parking locking device locks the piston rod to prevent the piston rod from moving, thereby realizing the entire parking locking process.

[0008] Optionally, the parking lock device includes a friction block installed in a parking shell, the friction block is slidably arranged in the parking shell and is used to press against the outer wall of the piston rod, a second return spring is arranged in the parking shell to push the friction block to separate from the piston rod, and the parking lock device also includes a parking lock mechanism that drives the friction block to press against the outer wall of the piston rod.

[0009] By adopting the above technical solution, after the vehicle stops, the parking lock mechanism acts on the friction block, so that the friction block presses against the side wall of the piston rod to prevent the piston rod from moving.

[0010] Optionally, the friction block and the second return spring are in two groups and are symmetrically arranged on both sides of the piston rod.

[0011] By adopting the above technical solution and symmetrically arranged friction blocks, the piston rod is subjected to more uniform force, thereby ensuring the stability of the overall structure.

[0012] Optionally, the parking lock mechanism includes two abutment cams rotatably connected to the parking housing, the side walls of the two abutment cams respectively abut against the side of the corresponding friction block facing away from the piston rod, and a lever is fixed on the abutment cam. The parking lock mechanism also includes a parking lock component that drives the lever to rotate and causes the abutment cam to drive the friction block to abut against the piston rod, and a parking unlocking component for contact locking.

[0013] By adopting the above technical solution, the parking lock assembly drives the lever to rotate, and the abutment cam is driven to rotate during the rotation of the lever. The abutment cam acts on the friction block to make the friction block move in the direction close to the piston rod. The friction block presses the piston rod tightly to prevent the piston rod from moving, thereby achieving the locking of the piston rod.

[0014] Optionally, the parking lock assembly includes a pull rod connected to the parking housing, the pull rod passes through the two levers, a parking spring is mounted on the pull rod, the parking spring is located between the two levers, the parking spring drives the two levers to rotate so that the abutment cam rotates, the abutment cam acts on the friction block and makes the friction block press against the piston rod.

[0015] By adopting the above technical solution, under the action of the parking spring, the lever is pushed to rotate in the opposite direction, and the lever drives the abutment cam to rotate. During the rotation of the abutment cam, the friction block is acted on, so that the friction block is pressed against the piston rod, thereby locking the piston rod and preventing the piston rod from retracting.

[0016] Optionally, the parking unlocking assembly includes a parking cylinder cover which is slidably arranged at both ends of the parking shell and seals the parking shell. The parking unlocking assembly includes two parking pistons arranged in the parking shell. A driving cylinder whose end passes through the parking cylinder cover is coaxially arranged on the two parking pistons. The driving cylinder is slidably and sealedly connected to the pull rod and the parking cylinder cover. The two levers are located on the outside of the parking shell and their ends abut against the corresponding driving cylinders. The parking shell is connected to two connecting joints which are connected to the interior. The two connecting joints are located on the outside of the parking piston. A brake main pipe is detachably connected to the connecting joint. Air is inflated into the parking shell through the brake main pipe, thereby pushing the two parking pistons to compress the parking spring, so that the lever rotates under the action of the second return spring. At the same time, the second return spring drives the friction block to disengage from the piston rod.

[0017] By adopting the above technical solution, air is inflated into the brake main pipe to push the two parking pistons to move in the direction of compressing the parking spring. Under the action of the second return spring, the two levers are pushed to rotate, and the abutment block is separated from the piston rod, thereby releasing the parking lock and achieving parking relief.

[0018] Optionally, a driving cam is slidably provided on the parking shell, and the driving cam is sleeved on the pull rod. The driving cam is located on the side of one of the levers away from the parking cylinder cover, and an abutment block is provided on the pull rod. The driving cam is located between the abutment block and the adjacent lever. The parking shell is provided with a driving cam that slides laterally along the pull rod, thereby driving a driving source to rotate the lever.

[0019] By adopting the above technical solution, the driving source acts on the driving cam, causing the driving cam to slide laterally along the pull rod, thereby driving the lever to rotate. During the sliding process of the driving cam, the two cylinder rods are pushed to move in the direction of compressing the parking spring, thereby causing the friction block to move in the direction away from the piston rod, thereby releasing the lock of the piston rod.

[0020] Optionally, a positioning plate is fixed on the parking housing, a sliding cylinder sleeved on the pull rod is slidably arranged on the positioning plate, the sliding cylinder is threadedly connected to the pull rod, and the abutment block is fixed on the sliding cylinder.

[0021] By adopting the above technical solution, the sliding cylinder is threadedly connected to the pull rod, which makes it easy to adjust the position relationship of the abutment block on the pull rod.

[0022] Optionally, the driving source includes a driving rack fixed on a driving cam, the parking shell is rotatably connected to a driving gear that meshes with the driving rack, the driving gear is provided with a manual release port for facilitating insertion of a handle, and the parking shell is provided with a limit assembly for limiting the rotation angle of the driving gear.

[0023] By adopting the above technical solution, the handle is inserted into the manual release port to drive the driving gear to rotate. The driving gear drives the driving rack and the driving cam fixedly connected to the driving rack to slide. During the sliding process of the driving cam, the lever is pushed to rotate. Under the action of the second return spring, the friction block is separated from the piston rod, realizing manual parking release.

[0024] Optionally, the limiting component includes a limiting plate fixed in the parking housing. A limiting groove coaxial with the driving gear is formed on the limiting plate, and a limiting block sliding in the limiting groove is fixed on the driving gear.

[0025] By adopting the above technical solution, the limiting block rotates in the limiting groove to limit the rotation angle of the driving gear, facilitating the positioning of the driving gear.

[0026] In summary, the principle of this application is that after the vehicle brakes and stops, the main brake pipe is emptied, and the air pressure in the piston chamber of the parking housing decreases as the main pipe is emptied. Under the action of the parking spring, the lever is pushed to rotate in the opposite direction. The lever drives the abutting cam to rotate. During the rotation of the abutting cam, it acts on the friction block, causing the friction block to tightly abut against the piston rod, thereby realizing the locking of the piston rod and preventing the piston rod from retracting, which may lead to a decrease in braking force, and achieving the function of stepless automatic parking for the vehicle. This application includes at least one of the following beneficial technical effects: By integrating the automatic parking function onto the brake cylinder, a highly integrated product is formed, eliminating the complex installation and connection steps between the automatic parking device and the brake cylinder, thus saving installation space, time, and reducing installation costs; Additionally, through the lever amplification and friction locking structure, stepless automatic parking is achieved, with no parking force loss after parking, high parking efficiency, and high safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram of an embodiment of this application.

[0028] Figure 2 is the structural schematic diagram for showing the inside of the cylinder block.

[0029] Figure 3 is the structural schematic diagram for showing the parking locking device.

[0030] Figure 4 is the connection structural schematic diagram of the brake piston and the connecting part.

[0031] Reference signs: 1, cylinder block; 2, cylinder head; 3, parking housing; 4, brake piston; 5, piston rod; 8, brake air inlet; 9, connecting part; 10, counterbore; 11, first return spring; 12, spring seat; 13, friction block; 14, second return spring; 15, abutting cam; 16, lever; 17, pull rod; 18, parking spring; 19, driving cam; 20, abutting block; 21, driving rack; 22, driving gear; 23, manual slow-release port; 24, compression spring; 25, limiting plate; 26, limiting groove; 27, limiting block; 28, parking cylinder head; 29, parking piston; 30, driving cylinder; 31, connecting joint; 32, positioning plate; 33, sliding cylinder; 34, second spring seat. Detailed implementation manners

[0032] The following details the implementation manners of the present application, and examples of the implementation manners are shown in the drawings.

[0033] In the description of this specification, the description with reference to the terms "certain implementation manners", "one implementation manner", "some implementation manners", "schematic implementation manners", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the implementation manner or example are included in at least one implementation manner or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same implementation manner or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more implementation manners or examples.

[0034] An embodiment of the present application discloses an automatic parking brake cylinder for railway vehicles.

[0035] Referring to Figure 1 、 Figure 2 and Figure 3 , an automatic parking brake cylinder for railway vehicles includes a cylinder block 1, a cylinder head 2, and a parking housing 3. The cylinder block 1 and the cylinder head 2 are detachably connected by bolts, and the front end of the cylinder head 2 is detachably connected to the parking housing 3 by bolts. A brake piston 4 is slidably connected in the cylinder block 1. A brake air inlet 8 is provided on the cylinder block 1, and the brake air inlet 8 is connected to a brake cylinder pipe. A compression spring 24 is arranged in the cylinder block 1. The compression spring 24 is sleeved on the piston rod 5 and pushes the brake piston 4 to move towards the direction close to the brake air inlet 8.

[0036] Referring to Figure 1 and Figure 4, a connecting part 9 is connected to the upper part inside the piston rod 5. The connecting part is preferably a fork-shaped push rod. The front end of the connecting part 9 is connected to the basic braking device. A counterbore 10 is axially formed in the piston rod 5. The rear end of the connecting part 9 is inserted into the counterbore 10. A first return spring 11 is sleeved outside the connecting part 9 in the counterbore 10. A first spring seat 12 and a second spring seat 34 are arranged on the inner wall of the counterbore 10. The first return spring 11 is installed between the first spring seat 12 and the second spring seat 34. The first spring seat 12 is located near one end of the counterbore 10 close to the connecting part 9, and the second spring seat 34 is located at the bottom of the counterbore 10. The rear section of the connecting part 9 is fixed on the second spring seat 34. The second spring seat 34 is slidably connected to the piston rod 5. The first spring seat 12 is fixed on the inner wall of the counterbore 10, so that the connecting part 9 automatically resets in the counterbore 10.

[0037] Referring to Figure 2 and Figure 3 , a parking locking device for preventing the piston rod 5 from retracting due to air leakage in the brake cylinder, thereby causing a decrease in braking force, is provided on the parking housing 3. The parking locking device includes a friction block 13 installed in the parking housing 3. The friction block 13 is slidably arranged in the parking housing 3. A second return spring 14 for pushing the friction block 13 to move away from the piston rod 5 is arranged in the parking housing 3. The friction block 13 and the second return spring 14 are two groups and are symmetrically arranged on both sides of the piston rod 5. The parking locking device further includes a parking locking mechanism for driving the friction block 13 to abut against the outer wall of the piston rod 5.

[0038] Referring to Figure 1 and Figure 4 , the parking locking mechanism includes two abutting cams 15 rotatably connected to the parking housing 3. The side walls of the two abutting cams 15 respectively abut against one side of the corresponding friction block 13 facing away from the piston rod 5. A lever 16 is integrally formed on each of the two abutting cams 15. When the lever 16 rotates, it drives the abutting cam 15 to rotate. During the rotation of the abutting cam 15, it pushes the friction block 13 to move in the direction of abutting against the piston rod 5, thereby realizing the locking of the piston rod 5.

[0039] Referring to Figure 2 and Figure 3 , the parking locking mechanism further includes a parking locking assembly for driving the lever 16 to rotate and enabling the abutting cam 15 to drive the friction block 13 to abut against the piston rod 5 and a parking unlocking assembly for unlocking. The parking locking assembly includes a pull rod 17 connected to the parking housing 3. The pull rod 17 horizontally penetrates through the two levers 16 and is slidably connected to the two levers 16. A parking spring 18 is sleeved on the pull rod 17. The parking spring 18 is located between the two levers 16. The parking spring 18 drives the two levers 16 to rotate, so that the abutting cam 15 rotates. The abutting cam 15 acts on the friction block 13 and makes the friction block 13 abut against the piston rod 5.

[0040] Referring to Figure 1 and Figure 2The parking unlocking assembly includes a parking cylinder cover 28 slidably arranged at both ends of the parking housing 3, and the parking cylinder cover 28 is used to seal the parking housing 3. The parking unlocking assembly also includes two parking pistons 29 arranged in the parking housing 3. The two parking pistons 29 are smoothly and sealedly connected to the inner wall of the parking housing 3. A driving cylinder 30 whose end passes through the parking cylinder cover 28 is coaxially arranged on the two parking pistons 29. The driving cylinder 30 is slidably and sealedly connected to the pull rod 17 and the parking cylinder cover 28. The two levers 16 are located on the outside of the parking housing 3 and the ends abut on the corresponding driving cylinder 30. The parking housing 3 is connected with two connecting joints 31 that are connected to the interior. The two connecting joints 31 are located on the outside of the parking piston 29. The connecting joint 31 is detachably connected with a brake main pipe. The parking housing 3 is inflated through the brake main pipe, thereby pushing the two parking pistons 29 to compress the parking spring 18, so that the lever 16 rotates under the action of the second return spring 14, and the second return spring 14 drives the friction block 13 to disengage from the piston rod 5.

[0041] Reference Figure 2 and Figure 3 A driving cam 19 is slidably provided on the parking housing 3, and the driving cam 19 is sleeved on the pull rod 17. The driving cam 19 can slide laterally along the pull rod 17, and the pull rod 17 can slide along its own length direction relative to the driving cam 19. The driving cam 19 is located on the side of one of the levers 16 away from the parking cylinder cover 28. An abutment block 20 is provided on the pull rod 17, and the driving cam 19 is located between the abutment block 20 and the adjacent lever 16. The parking housing 3 is provided with a driving source for the driving cam 19 to slide laterally along the pull rod 17, thereby driving the lever 16 to rotate.

[0042] Reference Figure 2 and Figure 3 A positioning plate 32 is fixed on the parking shell 3, and a sliding cylinder 33 is slidably arranged on the positioning plate 32 and sleeved on the pull rod 17. The sliding cylinder 33 is threadedly connected to the pull rod 17, and the abutment block 20 is fixed on the sliding cylinder 33. By rotating the sliding cylinder 33, the position of the abutment block 20 is adjusted.

[0043] Reference Figure 1 and Figure 4, the driving source includes a driving rack 21 fixed on a driving cam 19. A driving gear 22 meshing with the driving rack 21 is rotatably connected to a parking housing 3. A manual slow-release port 23 is formed on the driving gear 22, and a handle can be inserted into the manual slow-release port 23 to facilitate driving the driving gear 22 to rotate. A limiting component for limiting the rotation angle of the driving gear 22 is arranged on the parking housing 3. The limiting component includes a limiting plate 25 fixed inside the parking housing 3. A limiting groove 26 coaxial with the driving gear 22 is formed on the limiting plate 25. A limiting block 27 sliding in the limiting groove is fixed on the driving gear 22. The limiting block 27 rotates in the limiting groove 26 to limit the rotation angle of the driving gear 22, facilitating the positioning of the driving gear 22. A pin penetrating through the driving rack 21 and facilitating the positioning of the driving rack 21 is further arranged on the parking housing 3.

[0044] The implementation principle of the embodiment of this application is as follows: After the vehicle brakes and stops, the brake main pipe is emptied, and the air pressure in the piston cavity of the parking housing 3 decreases as the main pipe is emptied. Under the action of the parking spring 18, the lever 16 is pushed to rotate in the opposite direction. The lever 16 drives the abutting cam 15 to rotate. During the rotation of the abutting cam 15, it acts on the friction block 13, causing the friction block 13 to tightly abut against the piston rod 5, thereby realizing the locking of the piston rod 5 and preventing the piston rod 5 from retracting, which may lead to a decrease in braking force, and realizing the function of stepless automatic parking for the vehicle. This application includes at least one of the following beneficial technical effects: By integrating the automatic parking function onto the brake cylinder, a highly integrated product is formed, eliminating the complex installation and connection steps between the automatic parking device and the brake cylinder, thereby saving installation space, time, and reducing installation costs; in addition, through the lever amplification and friction locking structure, stepless automatic parking is achieved. After parking, there is no loss of parking force, and the parking efficiency and safety reliability are high.

[0045] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. An automatic parking brake cylinder for a railway vehicle, characterized in that: The invention comprises a cylinder body (1), a cylinder head (2) and a parking housing (3); the cylinder body (1) and the cylinder head (2), as well as the cylinder head (2) and the parking housing (3) are all detachably connected; a brake piston (4) is slidably connected inside the cylinder body (1); a piston rod (5) is fixed on the brake piston (4); a connecting part (9) is connected to the end of the piston rod (5); a front end of the connecting part (9) is connected to a basic braking device; a brake air inlet (8) for pushing the brake piston (4) to move is provided on the cylinder body (1); the brake air inlet (8) is connected to a brake cylinder pipe; and a parking lock device for preventing a reduction in braking force due to air leakage in the brake cylinder is provided on the parking housing (3).

2. The automatic parking brake cylinder for railway vehicles according to claim 1, characterized in that: The parking lock device comprises a friction block (13) installed in a parking housing (3), the friction block (13) is slidably arranged in the parking housing (3) and is used to press against the outer wall of a piston rod (5), a second return spring (14) is arranged in the parking housing (3) to push the friction block (13) to separate from the piston rod (5), and the parking lock device also comprises a parking lock mechanism for driving the friction block (13) to press against the outer wall of the piston rod (5).

3. The automatic parking brake cylinder for railway vehicles according to claim 2, characterized in that: The friction block (13) and the second return spring (14) are in two groups and are symmetrically arranged on both sides of the piston rod (5).

4. The automatic parking brake cylinder for railway vehicles according to claim 3, characterized in that: The parking lock mechanism comprises two abutting cams (15) rotatably connected to a parking housing (3), the side walls of the two abutting cams (15) respectively abut against the side of the corresponding friction block (13) away from the piston rod (5), a lever (16) is fixed on the abutting cam (15), and the parking lock mechanism also comprises a parking lock component for driving the lever (16) to rotate and make the abutting cam (15) drive the friction block (13) to abut against the piston rod (5) and a parking unlocking component for releasing the lock.

5. The automatic parking brake cylinder for railway vehicles according to claim 4, characterized in that: The parking lock assembly comprises a pull rod (17) connected to the parking housing (3), the pull rod (17) passing through the two levers (16), a parking spring (18) is sleeved on the pull rod (17), the parking spring (18) is located between the two levers (16), the parking spring (18) drives the two levers (16) to rotate so as to rotate the abutting cam (15), the abutting cam (15) acts on the friction block (13) and makes the friction block (13) press against the piston rod (5).

6. The automatic parking brake cylinder for railway vehicles according to claim 5, characterized in that: The parking unlocking assembly comprises a parking cylinder cover (28) which is slidably arranged at both ends of the parking housing (3) and seals the parking housing (3). The parking unlocking assembly comprises two parking pistons (29) arranged in the parking housing (3). A driving cylinder (30) whose end passes through the parking cylinder cover (28) is coaxially arranged on the two parking pistons (29). The driving cylinder (30) is slidably and sealably connected to the pull rod (17) and the parking cylinder cover (28). The two levers (16) are located outside the parking housing (3) and their ends abut against the corresponding driving cylinders ( 30), the parking housing (3) is connected with two connecting joints (31) which are connected with the interior, the two connecting joints (31) are located on the outside of the parking piston (29), and the connecting joint (31) is detachably connected with a brake pipe, and the parking housing (3) is inflated through the brake pipe, thereby pushing the two parking pistons (29) to compress the parking spring (18), so that the lever (16) rotates under the action of the second return spring (14), and at the same time, the second return spring (14) drives the friction block (13) to separate from the piston rod (5).

7. The automatic parking brake cylinder for railway vehicles according to claim 6, characterized in that: A driving cam (19) is slidably arranged on the parking housing (3), and the driving cam (19) is sleeved on the pull rod (17). The driving cam (19) is located on the side of one of the levers (16) away from the parking cylinder cover (28). An abutment block (20) is arranged on the pull rod (17), and the driving cam (19) is located between the abutment block (20) and the adjacent lever (16). The parking housing (3) is provided with a driving source for the driving cam (19) to slide laterally along the pull rod (17), thereby driving the lever (16) to rotate.

8. The automatic parking brake cylinder for railway vehicles according to claim 7, characterized in that: A positioning plate (32) is fixed on the parking shell (3), a sliding cylinder (33) sleeved on the pull rod (17) is slidably arranged on the positioning plate (32), the sliding cylinder (33) is threadedly connected to the pull rod (17), and the abutment block (20) is fixed on the sliding cylinder (33).

9. The automatic parking brake cylinder for railway vehicles according to claim 8, characterized in that: The driving source comprises a driving rack (21) fixed on a driving cam (19); a driving gear (22) meshing with the driving rack (21) is rotatably connected to the parking housing (3); a manual release opening (23) for facilitating the insertion of a handle is provided on the driving gear (22); and a limit assembly for limiting the rotation angle of the driving gear (22) is provided on the parking housing (3).

10. The automatic parking brake cylinder for railway vehicles according to claim 9, characterized in that: The limiting assembly comprises a limiting plate (25) fixed in the parking housing (3), the limiting plate (25) being provided with a limiting groove (26) coaxial with the driving gear (22), and the driving gear (22) being fixed with a limiting block (27) sliding in the limiting groove (26).

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