Parking brake cylinder and train

Abstract

The application provides a parking brake cylinder and a train, and the parking brake cylinder comprises a cylinder body, the cylinder body defines a movable cavity, an opening is arranged at an axial end of the movable cavity, and a flange interface for connecting a train pipe is further formed on the cylinder body; a brake rod is arranged in the movable cavity and is adapted to move along the axial direction of the movable cavity to extend out of the opening or retract; a reset member is arranged at an end of the brake rod away from the opening and is connected with the cylinder body and the brake rod respectively; and a self-locking mechanism for advancing and retracting is movably arranged in the movable cavity and is in transmission connection with the brake rod. According to the parking brake cylinder, the rusting and jamming inside the cylinder body and the malfunctions can be effectively solved. Moreover, the degree of automation is high, the overall control is simple, the train control personnel can control the start and stop of the train more time-saving and labor-saving, and the reliability of the parking brake is improved.

Description

Technical Field

[0001] This invention relates to the field of train braking technology, and more particularly to a parking brake cylinder and a train. Background Technology

[0002] A typical railway freight car braking system consists of one brake cylinder and one handbrake. The brake cylinder performs service braking (normal braking and emergency braking), while the handbrake is usually used when shunting, parking at stations, and on slopes.

[0003] Existing main handbrakes for railway freight cars typically consist of a housing, chain shaft, drive shaft, and handwheel, providing braking, releasing, and force adjustment functions. However, due to the semi-enclosed structure of the housing, the internal drive shaft and other components are exposed to the outside environment. Rainwater, coal slurry, and other impurities can easily enter the housing, leading to corrosion and jamming of the drive shaft over time, causing malfunctions such as poor release. Furthermore, this type of handbrake relies on manual power, with operation controlled by the direction of the handwheel's rotation and the amount of hand force, making it time-consuming and labor-intensive for operators. Summary of the Invention

[0004] This invention provides a parking brake cylinder and train to overcome the problems caused by rainwater, coal sludge and other impurities entering the moving chamber, such as internal corrosion and jamming of the parking brake cylinder, as well as poor braking performance. At the same time, it saves manpower in operation and makes the parking brake more reliable.

[0005] This invention provides a parking brake cylinder, comprising: a cylinder body defining a movable cavity, the movable cavity having an opening at one axial end, and the cylinder body also having a flange interface for connecting to a train pipe; a brake lever disposed in the movable cavity and adapted to move axially along the movable cavity to extend or retract from the opening; a reset member disposed at the end of the brake lever opposite to the opening and connected to both the cylinder body and the brake lever; and a self-locking mechanism movably disposed within the movable cavity and drivenly connected to the brake lever. The parking brake cylinder switches between a braking state and a releasing state. When switching from the releasing state to the braking state, air is injected into the flange interface through the train pipe, and the self-locking mechanism, under air pressure, pushes the brake lever to retract from the opening and locks itself. When switching from the braking state to the releasing state, air is injected into the flange interface through the train pipe, the self-locking mechanism unlocks, and the reset member pushes the brake lever to extend from the opening.

[0006] According to the present invention, the parking brake cylinder, with its main components such as the self-locking mechanism and reset element all located within the movable cavity of the cylinder body, and only the brake lever extending or retracting from the opening, provides excellent overall sealing of the movable cavity. This effectively solves the problem of rainwater, coal slurry, and other impurities entering the movable cavity during prolonged operation, causing internal corrosion and jamming of the parking brake cylinder, and resulting in poor release. Furthermore, since braking or releasing of the parking brake cylinder is achieved by injecting air into the flange interface through the train pipe to drive the self-locking mechanism, the system boasts a high degree of automation and simple overall operation. This allows train operators to control the start and stop of the train more efficiently and effortlessly, improving the reliability of the parking brake.

[0007] According to some embodiments of the present invention, the forward / reverse self-locking mechanism includes: a forward / reverse self-locking assembly, which is sleeved on the brake rod and throttle connected to the brake rod; a piston, which is sleeved on the brake rod and connected to the end of the forward / reverse self-locking assembly away from the reset member, wherein a side wall of the piston facing away from the forward / reverse self-locking assembly, together with the inner wall of the cylinder and the brake rod, defines a pressure chamber, and a flange interface communicates with the pressure chamber. When the train pipe injects air into the pressure chamber through the flange interface, the piston is adapted to push the forward / reverse self-locking assembly to achieve self-locking or unlocking.

[0008] Further, the forward / reverse self-locking assembly includes: a thrust bearing, which is sleeved on the brake rod and adjacent to the reset member, with one end of the thrust bearing facing the reset member being throttle-connected to the brake rod; a key cylinder, which is sleeved on the brake rod and axially movable relative to the brake rod, with one axial end of the key cylinder connected to the piston; and a rotary advance / reverse mechanism, which is sleeved on the brake rod and located between the key cylinder and the thrust bearing, and is axially separable from the key cylinder. The rotary advance / retractor is rotatable relative to the key cylinder; a sleeve is located between the key cylinder and the cylinder body; when switching from the release state to the braking state, the key cylinder cooperates with the thrust bearing so that the rotary advance / retractor is located on one axial side of the sleeve and abuts against the sleeve axially; when switching from the braking state to the release state, the key cylinder cooperates with the thrust bearing so that the rotary advance / retractor and the key cylinder abut against each other axially, and a portion of the rotary advance / retractor is located inside the sleeve.

[0009] Optionally, the end of the key cylinder facing the rotary advance / retractor is formed with a plurality of first sliders, which protrude radially outward and are spaced apart circumferentially; the outer peripheral wall of the rotary advance / retractor is formed with a plurality of second sliders corresponding one-to-one with the first sliders, which are spaced apart circumferentially; the inner wall of the sleeve has a plurality of guide portions arranged circumferentially, and a sliding groove extending axially is defined between two adjacent guide portions. The sliding groove corresponds one-to-one with and is adapted to the first slider. Both the first slider and the second slider are adapted to slide axially within the corresponding sliding groove. In the braking state, the second slider is located outside the sliding groove and abuts against the guide portion axially; in the releasing state, the second slider is located within the sliding groove and abuts against the first slider axially.

[0010] In some embodiments, the first slider extends axially to the outside of the key cylinder, and the end face of the first slider facing the rotary advance / retractor includes a first key cylinder helical surface and a second key cylinder helical surface connected sequentially along the circumference of the key cylinder; the end face of the second slider facing the key cylinder includes a first advance / retractor helical surface and a second advance / retractor helical surface connected sequentially along the circumference of the rotary advance / retractor, and the end face of the rotary advance / retractor located between two adjacent second sliders further includes a third advance / retractor helical surface, a fourth advance / retractor helical surface, and a fifth advance / retractor helical surface connected sequentially. The guide portion has a spiral surface; the end face of the guide portion facing the rotary advance / retractor has a first sleeve spiral surface, a second sleeve spiral surface, and a third sleeve spiral surface connected sequentially along the circumference of the sleeve, wherein the spiral helix angles of the first key cylinder spiral surface, the second advance / retractor spiral surface, the fourth advance / retractor spiral surface, the first sleeve spiral surface, and the third sleeve spiral surface are equal, the spiral helix angles of the first advance / retractor spiral surface and the second sleeve spiral surface are equal, and the spiral helix angles of the second key cylinder spiral surface, the third advance / retractor spiral surface, and the fifth advance / retractor spiral surface are equal.

[0011] According to some embodiments of the present invention, an abutment portion is formed at one end of the brake lever adjacent to the reset member, the outer diameter of the abutment portion being adapted to the inner diameter of the cylinder body, and the forward / reverse self-locking assembly further includes a brake spring, one end of which is connected to the abutment portion and the other end abutting against the thrust bearing.

[0012] In some embodiments, the reset member is a reset spring, and the brake rod is further provided with a mounting ring groove facing the opening of the reset member. One end of the reset member is connected to the cylinder body and the other end extends into the mounting ring groove.

[0013] In some embodiments, the cylinder includes a first segment and a second segment arranged sequentially along the axial direction, the inner diameter of the first segment is smaller than the inner diameter of the second segment, the outer diameter of the brake lever is smaller than the inner diameter of the first segment, the forward and backward self-locking assembly is adapted to move axially within the first segment, the piston is adapted to move axially within the second segment, and the reset member is disposed in the first segment.

[0014] According to some embodiments of the present invention, the forward and backward self-locking mechanism further includes: a first sealing member disposed between the outer peripheral wall of the piston and the inner wall of the cylinder; and a second sealing member disposed between the inner peripheral wall of the piston and the outer wall of the brake rod.

[0015] A second aspect of the invention also provides a train, the train including a braking assembly, the braking assembly including a parking brake cylinder according to a first aspect of the invention.

[0016] According to the present invention, by providing the parking brake cylinder of the first aspect to the braking assembly, the train operator can control the start and stop of the train more quickly and effortlessly, thereby improving the reliability of the parking brake. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the parking brake cylinder according to the present invention;

[0019] Figure 2 This is a cross-sectional view of section AA of the parking brake cylinder in the released state of this application;

[0020] Figure 3 This is a partial schematic diagram of the self-locking assembly for advancing and retreating when the parking brake cylinder of this application is in the released state;

[0021] Figure 4 This is a structural diagram of the AA section of the parking brake cylinder in the braking state of this application;

[0022] Figure 5 This is a partial schematic diagram of the self-locking assembly for advancing and retreating when the parking brake cylinder of this application is in the braking state;

[0023] Figure 6 This is a schematic diagram of the rotary advance / retreat mechanism of this application;

[0024] Figure 7 This is a schematic diagram of the sleeve structure of this application;

[0025] Figure 8 This is a schematic diagram of the key cylinder structure of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100 - Parking brake cylinder;

[0028] 1-Cylinder block; 11-First section; 12-Second section; 13-Opening; 131-Third mounting slot; 14-Flange interface; 15-Moving chamber; 151-Pressure chamber;

[0029] 2-Brake lever; 21-Abutment part; 22-Mounting ring groove;

[0030] 3-Reset component;

[0031] 4- Self-locking mechanism for forward and backward movement;

[0032] 41-Piston; 411-First mounting slot; 412-Second mounting slot;

[0033] 42- Self-locking forward / backward assembly;

[0034] 421 - Thrust bearing;

[0035] 422-Key cylinder; 4221-First slider; 4222-First key cylinder helical surface; 4223-Second key cylinder helical surface;

[0036] 423-Rotary advance / retractor; 4231-Second slider; 4232-First advance / retractor helical surface; 4233-Second advance / retractor helical surface; 4234-Third advance / retractor helical surface; 4235-Fourth advance / retractor helical surface; 4236-Fifth advance / retractor helical surface; 4237-Annular groove;

[0037] 424-Sleeve; 4241-Guide section; 4242-First sleeve helical surface; 4243-Second sleeve helical surface; 4244-Third sleeve helical surface; 4245-Groove;

[0038] 425 - Brake spring;

[0039] 43 - First seal; 44 - Second seal;

[0040] 5-Mounting base; 51-Horizontal section; 511-Connecting hole; 52-Vertical section; 6-Third seal. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following is for reference. Figures 1-8 A parking brake cylinder 100 according to a first aspect embodiment of the present invention is described.

[0043] refer to Figure 1 , Figure 2 and Figure 4 The parking brake cylinder 100 of this embodiment includes: cylinder body 1, brake lever 2, reset member 3, and forward / backward self-locking mechanism 4.

[0044] The cylinder body 1 can be formed into a cylindrical shape, defining a movable cavity 15. The cross-section of the movable cavity 15 can be annular. An opening 13 is provided at one axial end of the movable cavity 15. A flange interface 14 is also formed on the cylinder body 1. The flange interface 14 can be provided on the cylinder body 1 and located on the side where the opening 13 is located. The flange interface 14 and the opening 13 are arranged at a distance. The flange interface 14 is suitable for communicating with the train pipe. The train pipe can inject air into the cylinder body 1 through the flange interface 14.

[0045] Brake lever 2 is located within the movable cavity 15 and passes through the opening 13. Brake lever 2 can move axially along the movable cavity 15 to extend or retract from the opening 13. When brake lever 2 retracts, parking brake cylinder 100 engages braking; when brake lever 2 extends from the opening 13, parking brake cylinder 100 engages releasing. Reset element 3 can be a reset spring, located at the end of brake lever 2 facing away from the opening 13, and connected to both cylinder body 1 and brake lever 2. Forward / reverse self-locking mechanism 4 is located within the movable cavity 15 and is movably fitted onto brake lever 2. Flange interface 14 is located on the side of forward / reverse self-locking mechanism 4 facing away from reset element 3. Thus, when air is injected into flange interface 14 from the train pipe, the air pressure can drive forward / reverse self-locking mechanism 4 to operate.

[0046] The parking brake cylinder 100 is adapted to switch between a braking state and a released state. When switching from the released state to the braking state, air is injected into the flange interface 14 through the train pipe. Under the action of air pressure, the self-locking mechanism 4 pushes the brake lever 2 to retract from the opening 13, and then the self-locking mechanism 4 self-locks. In this way, after the parking brake cylinder 100 enters the braking state, the air injection into the flange interface 14 through the train pipe can stop, and the self-locking mechanism 4 can keep the brake lever 2 in the braking position even without air pressure. When switching from the braking state to the released state, air is injected into the flange interface 14 through the train pipe, the self-locking mechanism 4 unlocks, and the reset member 3 pushes the brake lever 2 to extend from the opening 13.

[0047] According to an embodiment of the present invention, the parking brake cylinder 100, with its main components such as the self-locking mechanism 4 and the reset component 3 all located within the movable cavity 15 of the cylinder body 1, and only the brake lever 2 extending or retracting from the opening 13, provides good overall sealing of the movable cavity 15. This effectively solves the problem of rainwater, coal slurry, and other impurities entering the movable cavity 15 during long-term operation, causing internal corrosion and jamming of the parking brake cylinder 100, and resulting in poor release. Furthermore, since the braking or release of the parking brake cylinder 100 is achieved by injecting air into the flange interface 14 through the train pipe to drive the self-locking mechanism 4 to lock or unlock, the degree of automation is high, and the overall operation is simple. This allows train operators to control the start and stop of the train more quickly and effortlessly, improving the reliability of the parking brake.

[0048] According to some embodiments of the present invention, reference Figure 2 and Figure 3 The forward / reverse self-locking mechanism 4 may include a forward / reverse self-locking assembly 42 and a piston 41. The forward / reverse self-locking assembly 42 is sleeved on the brake lever 2 and is tractively connected to the brake lever 2. The brake lever 2 is adapted to move axially under the action of the forward / reverse self-locking assembly 42. The piston 41 is sleeved on the brake lever 2 and connected to the end of the forward / reverse self-locking assembly 42 away from the reset member 3. The side wall of the piston 41 facing away from the forward / reverse self-locking assembly 42, together with the inner wall of the cylinder 1 and the brake lever 2, defines a pressure chamber 151 with a variable volume. The flange interface 14 communicates with the pressure chamber 151. When air is injected into the pressure chamber 151 through the train pipe via the flange interface 14, the piston 41 is adapted to push the forward / reverse self-locking assembly 42 to achieve self-locking or unlocking.

[0049] For example, when the train switches from a released state to a braking state, air is injected into the pressure chamber 151 through the flange interface 14. The air pressure causes the forward / reverse self-locking mechanism 4 to move axially away from the opening 13, thereby causing the brake lever 2 to retract. At this time, the volume of the pressure chamber 151 increases until the forward / reverse self-locking assembly 42 achieves self-locking, at which point the injection of air into the pressure chamber 151 can be stopped or the air in the pressure chamber 151 can be discharged. When the train switches from a braking state to a released state, air is injected into the pressure chamber 151 again through the flange interface 14 so that the air pressure drives the forward / reverse self-locking mechanism 4 to unlock. Then the injection of air is stopped and the air in the pressure chamber 151 is discharged. At this time, the brake lever 2 moves in the opposite direction under the action of the reset member 3. At the same time, the brake lever 2 can drive the forward / reverse self-locking mechanism 4 to move in the opposite direction, and the volume of the pressure chamber 151 gradually decreases. Thus, by injecting air into the pressure chamber 151 defined by the piston 41, cylinder 1, and brake lever 2, or by venting air outward, the forward and backward self-locking mechanism 4 can be driven, which helps to save manpower and makes the braking and release control process simpler and easier for personnel to operate.

[0050] Further, refer to Figure 2 and Figure 4 The forward / reverse self-locking assembly 42 may include: a thrust bearing 421, a key cylinder 422, a rotary advance / reverse mechanism 423, and a sleeve 424. The thrust bearing 421 is sleeved on the brake lever 2 and disposed adjacent to the reset member 3. One end of the thrust bearing 421 facing the reset member 3 is connected to the brake lever 2 in a transmission manner, and the thrust bearing 421 can move axially relative to the brake lever 2.

[0051] The key cylinder 422 is generally cylindrical and is sleeved on the brake rod 2. The key cylinder 422 can move axially relative to the brake rod 2, and one axial end of the key cylinder 422 is connected to the piston 41. The rotary advance / retractor 423 is sleeved on the brake rod 2 and is located between the key cylinder 422 and the thrust bearing 421. The rotary advance / retractor 423 is in axially separable contact with the key cylinder 422 and is adapted to rotate relative to the key cylinder 422. The end of the rotary advance / retractor 423 facing the thrust bearing 421 has an annular groove 4237 that matches the balls of the thrust bearing 421.

[0052] In the radial direction, sleeve 424 is located between key cylinder 422 and cylinder 1. When the parking brake cylinder 100 switches from the released state to the braking state, key cylinder 422 cooperates with thrust bearing 421 so that one end of rotary advance / retractor 423 adjacent to key cylinder 422 is located on the axial side of sleeve 424 and abuts against sleeve 424 axially. At this time, advance / retractor self-locking mechanism 4 enters self-locking state. When the parking brake cylinder 100 switches from the braking state to the released state, key cylinder 422 cooperates with thrust bearing 421 so that rotary advance / retractor 423 and key cylinder 422 abut against each other axially, and one end of rotary advance / retractor 423 adjacent to key cylinder 422 is located inside sleeve 424. At this time, advance / retractor self-locking mechanism 4 enters unlocking state.

[0053] In other words, the key cylinder 422 can always be inside the sleeve 424, while the rotary advance / retractor 423 is located on the axial side of the sleeve 424 and abuts against the sleeve 424 when the parking brake cylinder 100 is in the braking state, and is located inside the sleeve 424 and abuts against the key cylinder 422 when the parking brake cylinder 100 is in the released state.

[0054] More specifically, when the parking brake cylinder 100 switches from the released state to the braking state, the key cylinder 422, pushed by the piston 41, can first push the rotary advance mechanism 423 to move axially. When the rotary advance mechanism 423 moves from the inner side of the sleeve 424 to the axial side of the sleeve 424, the key cylinder 422 continues to act on the rotary advance mechanism 423. At this time, due to the cooperation between the balls of the thrust bearing 421 and the annular groove 4237 of the rotary advance mechanism 423, the rotary advance mechanism 423 rotates circumferentially so that it can abut against the sleeve 424 axially. At this time, the key cylinder 422 can disengage from the rotary advance mechanism 423, or only maintain contact without any force between them. When the parking brake cylinder 100 changes from the braking state to the release state, the key cylinder 422, under the push of the piston 41 and the cooperation of the thrust bearing 421, first acts on the rotary advance / retractor 423, causing it to rotate to a position that can enter the inner side of the sleeve 424. Then, the train pipe is controlled to stop injecting air, and the piston 41 no longer applies external force to the key cylinder 422. At this time, the reset member 3 drives the rotary advance / retractor 423 axially into the inner side of the sleeve 424, and the advance / retract self-locking mechanism 4 enters the unlocked state.

[0055] Optionally, refer to Figures 4-8 A plurality of first sliders 4221 are formed at one end of the key cylinder 422 adjacent to the rotary advance / retractor 423. The plurality of first sliders 4221 protrude radially outward and are arranged at intervals along the circumference of the key cylinder 422.

[0056] The outer peripheral wall of the rotary advance / retractor 423 is formed with a plurality of second sliders 4231, each of which corresponds to a first slider 4221. Each second slider 4231 extends along the axial direction of the rotary advance / retractor 423, and the plurality of second sliders 4231 can be arranged at intervals along the circumference of the rotary advance / retractor 423.

[0057] The inner wall of the sleeve 424 has multiple guide portions 4241, which are arranged at intervals along the circumference of the sleeve 424. A groove 4245 is defined between two adjacent guide portions 4241. The groove 4245 can extend along the axial direction of the sleeve 424. The groove 4245 corresponds to and is adapted to the first slider 4221. It can be understood that the groove 4245 corresponds to and is adapted to the second slider 4231. Both the first slider 4221 and the second slider 4231 are adapted to slide axially within the corresponding groove 4245.

[0058] When the parking brake cylinder 100 switches from the released state to the braking state, the piston 41 pushes the key cylinder 422 to move axially, so that the first slider 4221 can push the second slider 4231 out of the slide groove 4245. Then the key cylinder 422 cooperates with the thrust bearing 421 to drive the rotary advance and retreat mechanism 423 to rotate circumferentially along the brake lever 2, so that the second slider 4231 is misaligned with the slide groove 4245 and abuts against the guide part 4241 axially. At this time, the advance and retreat self-locking mechanism 4 achieves self-locking, and the parking brake cylinder 100 enters the braking state. When the parking brake cylinder 100 switches from the braking state to the release state, under the action of the piston 41, the first slider 4221 on the key cylinder 422 cooperates with the thrust bearing 421 to act together on the rotary advance and retreat mechanism 423, so as to drive the rotary advance and retreat mechanism 423 to rotate around the brake lever 2, so that the first slider 4221 rotates into the slide groove 4245, thereby unlocking the advance and retreat self-locking mechanism 4 and the parking brake cylinder 100 enters the release state.

[0059] In some embodiments, reference Figure 8 The first slider 4221 extends axially beyond the end face of the key cylinder 422. The end face of the first slider 4221 facing the rotary advance / retractor 423 includes a first key cylinder helical surface 4222 and a second key cylinder helical surface 4223 connected sequentially in the circumferential direction. The first key cylinder helical surface 4222 and the second key cylinder helical surface 4223 have opposite directions of rotation. The first key cylinder helical surface 4222 and the second key cylinder helical surface 4223 can together form a wave-shaped surface, such as an inverted V-shaped surface. The length of the first key cylinder helical surface 4222 in the circumferential direction is less than the length of the second key cylinder helical surface 4223 in the circumferential direction.

[0060] refer to Figure 6 The end face of the second slider 4231 facing the key cylinder 422 includes a first advance / retractor spiral surface 4232 and a second advance / retractor spiral surface 4233 connected in sequence along the circumference. The end face of the rotary advance / retractor 423 located between two adjacent second sliders 4231 also includes a third advance / retractor spiral surface 4234, a fourth advance / retractor spiral surface 4235 and a fifth advance / retractor spiral surface 4236 connected in sequence. At the same time, the second advance / retractor spiral surface 4233 and the third advance / retractor spiral surface 4234 are connected in sequence along the circumference. The first advance / retractor spiral surface 4232, the second advance / retractor spiral surface 4233, the third advance / retractor spiral surface 4234, the fourth advance / retractor spiral surface 4235 and the fifth advance / retractor spiral surface 4236 can roughly form a wavy surface.

[0061] refer to Figure 7The guide portion 4241 has a first sleeve spiral surface 4242, a second sleeve spiral surface 4243 and a third sleeve spiral surface 4244 connected in sequence along the circumference. The first sleeve spiral surface 4242, the second sleeve spiral surface 4243 and the third sleeve spiral surface 4244 can roughly form a wavy surface.

[0062] Among them, the helix angles of the first key cylinder helical surface 4222, the second advance / retractor helical surface 4233, the fourth advance / retractor helical surface 4235, the first sleeve helical surface 4242, and the third sleeve helical surface 4244 are equal; the helix angles of the first advance / retractor helical surface 4232 and the second sleeve helical surface 4243 are equal; and the helix angles of the second key cylinder helical surface 4223, the third advance / retractor helical surface 4234, and the fifth advance / retractor helical surface 4236 are equal.

[0063] Understandably, the two helical surfaces with equal helix angles belonging to the key cylinder 422 and the rotary advance / retractor 423 can be axially engaged with each other, and one of the helical surfaces can move along the helical direction of the other helical surface, thereby causing relative rotation between the key cylinder 422 and the rotary advance / retractor 423; similarly, the two helical surfaces with equal helix angles belonging to the sleeve 424 and the rotary advance / retractor 423 can be axially engaged with each other, and one of the helical surfaces can move along the helical direction of the other helical surface, thereby causing relative rotation between the sleeve 424 and the rotary advance / retractor 423.

[0064] Thus, when the parking brake cylinder 100 switches from the released state to the braking state, pressurized air is injected from the train pipe into the flange interface 14. The piston 41 pushes the key cylinder 422 to translate axially along the brake lever 2. Since the first slider 4221 and the second slider 4231 are both located in the axially extending groove 4245, under the guidance and limitation of the groove 4245, the key cylinder 422 can push the rotary advance / retractor 423 to move axially until the second slider 4231 moves from the groove 4245 to the sleeve. The key cylinder 422 continues to push the rotary advance / retractor 423 along one axial side and disengages from the slide groove 4245. With the cooperation of the thrust bearing 421 at the other end, the second advance / retractor helical surface 4233 rotates from the first key cylinder helical surface 4222 towards the third sleeve helical surface 4244 and retracts slightly until the first advance / retractor helical surface 4232 contacts the second sleeve helical surface 4243. At this time, the rotary advance / retractor 423 is in a stably maintained extended position, realizing the self-locking of the advance / retractor self-locking mechanism 4. During this process, since the rotary advance / retractor 423 is provided with an annular groove 4237 that matches the balls of the thrust bearing 421, as the rotary advance / retractor 423 extends out of the sleeve 424, it can sequentially push the thrust bearing 421 and the brake lever 2. The brake lever 2 then retracts from the opening 13 of the cylinder body 1 to generate a braking effect. In this way, the parking brake cylinder 100 reaches the braking state. At this time, the pressurized air in the pressure chamber 151 can be discharged from the flange interface 14. The braking force is not maintained by the air pressure, but by the self-locking state of the forward and backward self-locking mechanism 4. The braking force will not be insufficient due to slow leakage caused by poor sealing of the cylinder 1. At this time, the key cylinder 422 can be separated from the rotary advance and retreat device 423 or maintain slight contact.

[0065] When the parking brake cylinder 100 switches from the braking state to the releasing state, the train pipe re-injects pressurized air into the pressure chamber 151 from the flange interface 14. The key cylinder 422 is pushed by the piston 41 and moves axially along the brake lever 2. The key cylinder 422 re-applies force to the rotary advance / retractor 423. The first key cylinder helical surface 4222 engages with the fourth advance / retractor helical surface 4235, and the first advance / retractor helical surface 4232 engages with the second sleeve helical surface 4243. The key cylinder 422 drives the rotary advance / retractor 423 to extend slightly along the axial direction while rotating until the first advance / retractor helical surface 4232 passes over the second sleeve helical surface 4243. The second advance / retractor helical surface 4233 slides down along the first sleeve helical surface 4242. Then, the second slider 4231 re-enters the groove 4245 on the inner wall of the sleeve 424. The rotary advance / retractor 423 returns to the retracted position under the push of the ball bearing 421 at the other end. During the retraction of the rotary advance / retractor 423, the brake lever 2 extends from the opening 13 of the cylinder body 1 under the action of the reset member 3, thus releasing the brake. The parking brake cylinder 100 then reaches the released state. Understandably, when the second slider 4231 re-enters the groove 4245 on the inner wall of the sleeve 424, the train pipe can stop injecting air into the pressure chamber 151, and at this time, the pressurized air in the pressure chamber 151 is discharged from the flange interface 14 to prevent the pressurized air from preventing the self-locking mechanism 4 from resetting and the reset member 3 from pushing the brake lever 2 out. The released state of the parking brake cylinder 100 is not maintained by air pressure but by the reset member 3, preventing accidental braking due to slow leakage caused by poor sealing of the cylinder body 1.

[0066] According to some embodiments of the present invention, reference Figure 2 and Figure 3 The brake lever 2 has an abutment portion 21 at one end adjacent to the reset member 3. The abutment portion 21 can be formed as a support flange extending radially outward from the brake lever 2. The outer diameter of the abutment portion 21 is adapted to the inner diameter of the cylinder body 1. The forward and backward self-locking assembly 42 also includes a brake spring 425. One end of the brake spring 425 is connected to the abutment portion 21 and the other end abuts against the thrust bearing 421. That is, during the process of the parking brake cylinder 100 switching from the release state to the braking state, the thrust bearing 421 compresses the brake spring 425, and then the brake spring 425 drives the brake lever 2 to retract. In this way, the brake spring 425 can buffer the retraction action of the brake lever 2, which can make the braking action of the parking brake cylinder 100 smoother.

[0067] In some embodiments, reference Figure 2 and Figure 3The reset component 3 is a reset spring. The brake lever 2 has a mounting ring groove 22 on one end face facing the reset component 3. The mounting ring groove 22 is open on one side facing the reset component 3. One end of the reset component 3 is connected to the cylinder body 1 and the other end extends into the mounting ring groove 22. In this way, the reset component 3 can be prevented from bending and deforming, and from falling out of its original position due to excessive force.

[0068] In some embodiments, reference Figure 2 and Figure 4 The cylinder body 1 may include a first section 11 and a second section 12, which are arranged sequentially along the axial direction. The inner diameter of the first section 11 is smaller than the inner diameter of the second section 12, and the outer diameter of the brake lever 2 is smaller than the inner diameter of the first section 11. The forward and backward self-locking assembly 42 is adapted to move axially within the first section 11, and the piston 41 is adapted to move axially within the second section 12. The reset member 3 is located in the first section 11. This helps to reduce the volume of the cylinder body 1 and reduce the overall weight. In addition, the space of the movable cavity 15 is smaller, which can reduce the risk of failure of components such as the reset member 3 and the forward and backward self-locking mechanism 4.

[0069] According to some embodiments of the present invention, reference Figure 2 and Figure 4 The forward and backward self-locking mechanism 4 may further include a first seal 43 and a second seal 44. The first seal 43 is disposed between the outer peripheral wall of the piston 41 and the inner wall of the cylinder 1, and the second seal 44 is disposed between the inner peripheral wall of the piston 41 and the outer wall of the brake lever 2. Thus, through the mutual cooperation of the first seal 43 and the second seal 44, the sealing performance of the pressure chamber 151 can be improved, preventing leakage of pressurized air within the pressure chamber 151, and helping to ensure braking and release performance.

[0070] Further, refer to Figure 2 and Figure 4 The outer peripheral wall of the piston 41 has a first mounting groove 411, and the first seal 43 can be embedded in the first mounting groove 411. The inner peripheral wall of the piston 41 has a second mounting groove 412, and the second seal 44 can be embedded in the second mounting groove 412. In this way, when the piston 41 moves axially, the first seal 43 and the second seal 44 can be prevented from being misaligned or falling off the piston 41 due to friction. This can further ensure the sealing performance of the pressure chamber 151.

[0071] According to some embodiments of the present invention, reference Figure 2 and Figure 4The parking brake cylinder 100 also includes a third seal 6, which is located between the inner peripheral wall of the opening 13 of the cylinder body 1 and the brake lever 2. For example, a third mounting groove 131 can be provided on the inner peripheral wall of the opening 13, and the third seal 6 can be embedded in the third mounting groove 131. In this way, the sealing performance of the inner cavity of the cylinder body 1, i.e. the movable cavity 15, can be guaranteed, preventing dust or other impurities from entering the movable cavity 15 and causing damage to the parking brake cylinder 100.

[0072] According to some embodiments of the present invention, reference Figure 1 The parking brake cylinder 100 may also include a mounting base 5, which includes a horizontal section 51 and a vertical section 52. The lower end of the vertical section 52 is connected to the cylinder body 1, and the upper end of the vertical section 52 is connected to the horizontal section 51. The horizontal section 51 is provided with a connecting hole 511, such as a threaded hole. Multiple mounting bases 5 may be provided, and multiple mounting bases 5 may be spaced apart and symmetrically distributed on the top of the cylinder body 1. The mounting base 5 is suitable for connection with the train body. In this way, it is convenient to install the parking brake cylinder 100 onto the train body. At the same time, the structure is simple and easy to form.

[0073] The train according to a second aspect of the present invention is described below.

[0074] The train according to the embodiments of the present invention can be a train, a freight train, etc. The train includes a braking assembly, which includes the parking brake cylinder 100 in the above embodiments.

[0075] Specifically, the parking brake cylinder 100 can be installed on the vehicle body via the mounting base 5. The flange interface 14 of the parking brake cylinder 100 can be connected to the train pipe. Here, the flange interface 14 can be directly connected to the train pipe, or a switch valve can be installed between the flange interface 14 and the train pipe. When the train does not need parking brake, the switch valve is closed to prevent leakage from the train pipe. When parking brake is needed or released, the switch valve is opened so that the train pipe can inject air into the parking brake cylinder 100 through the flange interface 14.

[0076] According to the embodiments of the present invention, by providing the parking brake cylinder 100 in the above embodiments for the braking assembly, the overall operation is simple, which can enable train operators to control the start and stop of the train more quickly and effortlessly, and improve the reliability of the parking brake.

[0077] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A parking brake cylinder, characterized in that, include: The cylinder body defines a movable cavity, one axial end of which has an opening, and the cylinder body also has a flange interface for connecting to the train pipe. A brake lever, wherein the brake lever is disposed in the movable cavity and is adapted to move axially along the movable cavity to extend or retract from the opening; A reset component is provided at the end of the brake lever facing away from the opening and is connected to both the cylinder and the brake lever. An advance / retreat self-locking mechanism is movably disposed within the movable cavity and is connected to the brake lever via a transmission connection. The parking brake cylinder switches between a braking state and a release state. When switching from the release state to the braking state, the train pipe injects air into the flange interface, and the forward / backward self-locking mechanism pushes the brake lever back from the opening and locks itself under the action of air pressure. When switching from the braking state to the release state, the train pipe injects air into the flange interface, the forward / backward self-locking mechanism unlocks, and the reset member pushes the brake lever out from the opening.

2. The parking brake cylinder according to claim 1, characterized in that, The self-locking mechanism includes: An advance / reverse self-locking assembly is sleeved on the brake rod and is connected to the brake rod in a transmission manner; A piston is sleeved on the brake lever and connected to the end of the forward / reverse self-locking assembly away from the reset member. The side wall of the piston facing away from the forward / reverse self-locking assembly, together with the inner wall of the cylinder and the brake lever, defines a pressure chamber. The flange interface communicates with the pressure chamber. When the train pipe injects air into the pressure chamber through the flange interface, the piston is adapted to push the forward / reverse self-locking assembly to achieve self-locking or unlocking.

3. The parking brake cylinder according to claim 2, characterized in that, The self-locking mechanism includes: A thrust bearing is sleeved on the brake rod and adjacent to the reset member, and one end of the thrust bearing facing the reset member is connected to the brake rod in a transmission manner. A key cylinder is sleeved on the brake rod and can move axially relative to the brake rod, with one axial end of the key cylinder connected to the piston; A rotary advance / retractor is sleeved on the brake rod and located between the key cylinder and the thrust bearing. The rotary advance / retractor is axially separable from the key cylinder and can rotate relative to the key cylinder. A sleeve, located between the keyway and the cylinder body; When switching from the release state to the braking state, the key cylinder cooperates with the thrust bearing so that the rotary advance / retractor is located on the axial side of the sleeve and abuts against the sleeve axially; when switching from the braking state to the release state, the key cylinder cooperates with the thrust bearing so that the rotary advance / retractor and the key cylinder abut against each other axially, and a portion of the rotary advance / retractor is located inside the sleeve.

4. The parking brake cylinder according to claim 3, characterized in that, The key cylinder has a plurality of first sliders at one end facing the rotary advance and retreat device. The plurality of first sliders protrude radially outward and are arranged at intervals along the circumferential direction. The outer peripheral wall of the rotary advance and retreat device is formed with a plurality of second sliders corresponding one-to-one with the first slider, and the plurality of second sliders are arranged at intervals along the circumferential direction. The inner wall of the sleeve has a plurality of guide portions arranged circumferentially at intervals, and a sliding groove extending axially is defined between two adjacent guide portions. The sliding groove corresponds one-to-one with and is adapted to the first slider. Both the first slider and the second slider are adapted to slide axially within the corresponding sliding groove. In the braking state, the second slider is located outside the groove and abuts against the guide portion axially; in the releasing state, the second slider is located inside the groove and abuts against the first slider axially.

5. The parking brake cylinder according to claim 4, characterized in that, The first slider extends axially to the outer side of the end face of the key cylinder, and the end face of the first slider facing the rotary advance and retreat device includes a first key cylinder helical surface and a second key cylinder helical surface connected sequentially along the circumference of the key cylinder. The end face of the second slider facing the key cylinder includes a first advance / retractor spiral surface and a second advance / retractor spiral surface connected in sequence along the circumference of the rotary advance / retractor. The end face of the rotary advance / retractor located between two adjacent second sliders also includes a third advance / retractor spiral surface, a fourth advance / retractor spiral surface and a fifth advance / retractor spiral surface connected in sequence. The end face of the guide portion facing the rotary advance / retractor has a first sleeve helical surface, a second sleeve helical surface, and a third sleeve helical surface that are sequentially connected along the circumference of the sleeve. Among them, the helix angles of the first key cylinder helical surface, the second advance / retractor helical surface, the fourth advance / retractor helical surface, the first sleeve helical surface, and the third sleeve helical surface are equal; the helix angles of the first advance / retractor helical surface and the second sleeve helical surface are equal; and the helix angles of the second key cylinder helical surface, the third advance / retractor helical surface, and the fifth advance / retractor helical surface are equal.

6. The parking brake cylinder according to claim 3, characterized in that, The brake lever has an abutment portion formed at one end adjacent to the reset member, the outer diameter of which is adapted to the inner diameter of the cylinder. The forward and backward self-locking assembly also includes a braking spring, one end of which is connected to the abutment portion and the other end of which abuts against the thrust bearing.

7. The parking brake cylinder according to claim 1, characterized in that, The reset component is a reset spring, and the brake lever also has a mounting ring groove that faces the opening of the reset component. One end of the reset component is connected to the cylinder body and the other end extends into the mounting ring groove.

8. The parking brake cylinder according to claim 2, characterized in that, The cylinder body includes a first section and a second section arranged sequentially along the axial direction. The inner diameter of the first section is smaller than the inner diameter of the second section, and the outer diameter of the brake lever is smaller than the inner diameter of the first section. The forward and backward self-locking assembly is adapted to move axially within a first section, the piston is adapted to move axially within a second section, and the reset member is located in the first section.

9. The parking brake cylinder according to claim 2, characterized in that, The self-locking mechanism for advancing and retreating also includes: A first seal is disposed between the outer peripheral wall of the piston and the inner wall of the cylinder. The second seal is disposed between the inner peripheral wall of the piston and the outer wall of the brake rod.

10. A train, characterized in that, It includes a braking assembly, the braking assembly including a parking brake cylinder according to any one of claims 1-9.

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