Parking cylinder, brake cylinder with parking function, brake caliper unit and rail vehicle

Abstract

The application provides a parking cylinder, a brake cylinder with a parking function, a brake clamp unit and a railway vehicle. The parking cylinder comprises a cylinder body, a locking mechanism and a relief piston. The cylinder body comprises a first cavity and a second cavity in communication. The locking mechanism is movably installed in the second cavity and has two working states of locking and unlocking. The relief piston is movably installed in the first cavity and forms a sealed cavity with the inner wall of the first cavity. The relief piston comprises a relief piston head, a relief piston rod and a relief piston spring. The relief piston spring is sleeved on the outer periphery of the relief piston rod. One end of the relief piston spring close to the relief piston head abuts against the cylinder body, and the other end abuts against a stopper arranged on the relief piston rod. The relief piston rod extends out of the first cavity and is movably connected with the locking mechanism. According to the technical scheme, the relief piston spring is arranged on the relief piston rod reasonably, which provides more flexible installation space for the integrated arrangement of the hand relief pull rope and other components, and improves the compactness of the structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail train braking systems, in particular to a parking cylinder, and further relates to a parking brake cylinder, a brake caliper unit and a rail vehicle comprising the parking cylinder. BACKGROUND

[0002] At present, the spring energy storage type parking brake cylinder realizes parking brake and release parking brake through exhaust and inflation in the cylinder. When there is no air for inflation to release the parking brake, the manual release rope is often used to release the parking brake. With the high-density operation of high-speed trains in large-span areas, in order to fully guarantee the safety and efficient operation of rail transit vehicles, the manual release device has become an essential standard configuration of the rail vehicle braking system. However, the existing spring energy storage type parking brake cylinder and manual release device not only have heavy quality, but also cannot meet the requirement of train lightening, and have large size, complex structure and lack of compactness. Chinese patent application CN105882679A discloses a railway braking system for railway vehicles. The patent adopts a locking parking cylinder. The core components of the locking parking cylinder include a release device and a locking mechanism. The parking brake and the release parking brake are realized by cooperation of the release device and the locking mechanism. Compared with the traditional spring energy storage type parking brake cylinder, the locking parking cylinder is relatively compact in structure because the energy storage spring assembly is cancelled. However, the patent does not fully consider the integrated design of the manual release device and the parking cylinder, so it does not reserve sufficient space for the installation of the manual release device. At most, it can only allow the installation of one manual release rope, and it is easy to interfere with the release piston spring located inside the release piston. If the interference is to be avoided, the radial or axial size will inevitably be increased, thereby sacrificing the overall compactness and lightness of the parking cylinder.

[0003] Moreover, the patent does not disclose the specific structure of the manual release device, and there is no corresponding or matching integrated manual release device to manually release the parking brake.

[0004] Especially in recent years, in order to guarantee the reliable release of parking brake of rail vehicles in any operating environment, two sets of manual release devices are usually required to realize manual release of brake from either side of the train. Therefore, how to realize the integrated design of the manual release device and the parking cylinder under the premise of ensuring compactness and lightness has become a key problem to be solved urgently.

[0005] In addition, the patent has unreasonable structure design of the locking mechanism, does not consider the effective cooperation of force transmission between the related components such as the locking finger and the locking ratchet, and has many disadvantages such as large required pulling force for parking relief, easy failure of unlocking jamming or locking, large manufacturing difficulty, high cost and the like, which is not conducive to the reliable implementation of parking cylinder parking relief or parking brake. Therefore, it is still necessary to further improve in the aspects of parking relief convenience, locking reliability, manufacturing and processing convenience and economy and the like. SUMMARY

[0006] The present application aims to provide a parking cylinder, a brake cylinder with parking function comprising the parking cylinder, and a brake caliper unit and a railway vehicle comprising the brake cylinder with parking function, to at least solve or alleviate one or more problems mentioned in the background art.

[0007] In order to achieve one of the foregoing purposes, according to another aspect of the present application, a parking cylinder for a brake cylinder is provided, comprising: a cylinder body comprising a first cavity and a second cavity in communication; a locking mechanism movably mounted in the second cavity and having two working states of locking and unlocking; and a relief piston movably mounted in the first cavity and forming a sealed cavity with the inner wall of the first cavity, movement of the relief piston in the cylinder body along a first axial direction drives the locking mechanism into the locking or unlocking working state, thereby realizing parking brake or relief of the parking cylinder; wherein the relief piston comprises a relief piston head, a relief piston rod and a relief piston spring, the relief piston spring is sleeved on the outer periphery of the relief piston rod, one end of the relief piston spring close to the relief piston head abuts against the cylinder body, and the other end abuts against a stopper provided on the relief piston rod; one end of the relief piston rod away from the relief piston head extends out of the first cavity and is movably connected with the locking mechanism.

[0008] In addition to one or more of the above features, or as an alternative, in further embodiments, the one end of the relief piston rod close to the relief piston head is detachably connected with the relief piston head.

[0009] In addition to one or more of the above features, or as an alternative, in further embodiments, the one end of the relief piston rod close to the relief piston head is detachably connected with the relief piston head.

[0010] In addition to one or more of the above features, or as an alternative, in further embodiments, the one end of the relief piston rod close to the relief piston head is detachably connected with the relief piston head.

[0011] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston head includes a first end proximate the relief piston stem, and an annular boss extending from the first end along a first axis toward the relief piston stem.

[0012] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston stem proximate the relief piston head is configured as a hollow cylinder, an inner diameter of the hollow cylinder is greater than an outer diameter of the annular boss, and the annular boss is inserted into the hollow cylinder.

[0013] In addition to one or more of the features described above, or as an alternative, in further embodiments an inner circumference of the hollow cylinder is configured with internal threads, an outer circumference of the annular boss is configured with external threads, and the annular boss is inserted into the hollow cylinder via a threaded twist fit.

[0014] In addition to one or more of the features described above, or as an alternative, in further embodiments an outer diameter of the relief piston stem proximate the relief piston head is less than an inner diameter of the annular boss, and the relief piston stem proximate the relief piston head is inserted into the annular boss.

[0015] In addition to one or more of the features described above, or as an alternative, in further embodiments an outer circumference of the relief piston stem proximate the relief piston head is configured with external threads, an inner circumference of the annular boss is configured with internal threads, and the relief piston stem proximate the relief piston head is inserted into the annular boss via a threaded twist fit.

[0016] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston stem proximate the relief piston head is configured with a relief piston bore having internal threads; the second end of the relief piston head opposite the first end is provided with an open cavity, the open cavity is in communication with the annular boss via a communication hole, and the relief piston head is connected to the relief piston stem via a bolt arranged in the open cavity and through the communication hole, and threadably connected to the relief piston bore.

[0017] In addition to one or more of the features described above, or as an alternative, in further embodiments the stop includes a shoulder circumferentially disposed at an axial middle portion of the relief piston stem, the shoulder is in a sliding fit with an inner wall of the first cavity, and an end of the relief piston spring distal to the relief piston head is abutted against the shoulder.

[0018] In addition to one or more of the features described above, or as an alternative, in further embodiments the shoulder is circumferentially provided at its side with a wear ring having an outer diameter larger than the diameter of the shoulder, the wear ring being in a sliding fit with the inner wall of the first cavity.

[0019] In addition to one or more of the features described above, or as an alternative, in further embodiments the side of the shoulder is circumferentially provided with an annular groove, the wear ring being fixedly or detachably fitted in the annular groove; the wear ring being configured as a split ring.

[0020] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston head forms a sliding sealing fit with the inner wall of the first cavity at a portion thereof distal to the second cavity, and the end of the relief piston rod distal to the relief piston head forms a sliding sealing fit with the inner wall of the first cavity at a portion thereof proximal to the second cavity.

[0021] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston head forms a sliding sealing fit with the inner wall of the first cavity via a first seal, and the end of the relief piston rod distal to the relief piston head forms a sliding sealing fit with the first cavity via a second seal, whereby the sealed cavity is formed between the first and second seals along a first axial direction between the relief piston and the inner wall of the first cavity.

[0022] In addition to one or more of the features described above, or as an alternative, in further embodiments the relief piston head is circumferentially provided at its side with a relief piston head groove, the first seal being arranged in the relief piston head groove, the first seal being any one of: an O-ring, a rectangular seal, a star seal, a K-seal, a seal with a skeleton.

[0023] In addition to one or more of the features described above, or as an alternative, in further embodiments the first cavity is circumferentially provided at its inner wall with a cavity groove, the second seal being arranged in the cavity groove, the second seal being any one of: an O-ring, a rectangular seal, a star seal, a K-seal, a seal with a skeleton.

[0024] In addition to one or more of the features described above, or as an alternative, in further embodiments the first cavity is further provided with a gas charging channel, the gas charging channel being in communication with the sealed cavity for charging the sealed cavity with gas, or evacuating gas from the sealed cavity.

[0025] In addition to one or more of the above features, or as an alternative, in further embodiments the gas filling passage extends along a radial direction of the relief piston rod and is disposed proximate to the relief piston head.

[0026] In addition to one or more of the above features, or as an alternative, in further embodiments the parking cylinder further comprises a cylinder head fitted to an end of the first cavity distal from the second cavity; and a relief rope connected to the relief piston head via the cylinder head distal from the second end of the relief piston rod.

[0027] In addition to one or more of the above features, or as an alternative, in further embodiments the second end of the relief piston head is provided with a bossed open bolt mounting portion protruding towards the relief rope, the open bolt mounting portion having a diameter smaller than that of the second end; one end of the relief rope is clamped in an open bolt fitted into the open bolt mounting portion to connect the relief rope to the relief piston head.

[0028] In addition to one or more of the above features, or as an alternative, in further embodiments two threaded holes are radially symmetrically provided on the open bolt mounting portion, and the two relief ropes are connected to the relief piston via the two open bolts respectively threadedly connected to the two threaded holes.

[0029] In addition to one or more of the above features, or as an alternative, in further embodiments the relief piston head further comprises a limit pin mounting portion provided at the second end and a pin hole recessed along a first axial direction from an end face of the limit pin mounting portion, and a limit pin fixedly connected to the cylinder head is inserted into the pin hole to limit a circumferential deflection of the relief piston.

[0030] In addition to one or more of the above features, or as an alternative, in further embodiments the limit pin mounting portion is protruded away from the second end from an end face of the open bolt mounting portion, and a recessed distance of the pin hole from the end face of the limit pin mounting portion is less than or equal to a protruded distance of the limit pin mounting portion, or the recessed distance of the pin hole from the end face of the limit pin mounting portion is greater than the protruded distance of the limit pin mounting portion.

[0031] In addition to one or more of the above features, or as an alternative, in further embodiments the parking cylinder further comprises a relief rope holder disposed along a first axial direction and connected to the cylinder head, and the relief rope is held by and connected to the relief piston head via the relief rope holder.

[0032] In addition to one or more of the features described herein, or as an alternative, in further embodiments the parking cylinder further comprises an anti-escape member abutting and fixed to an end face of the cylinder cover facing away from the cylinder body and clamped to the relief rope holder to limit displacement of the relief rope holder along the first axis.

[0033] In addition to one or more of the features described herein, or as an alternative, in further embodiments the locking mechanism comprises a locking finger movably mounted in the second cavity, a locking ratchet connected with a brake piston in a service cylinder of the brake cylinder, constituting a thread pair movable relative to each other, the locking finger engages or disengages with the locking ratchet, thereby the locking mechanism is locked or unlocked, a locking rod provided between the locking finger and the locking ratchet, a first end of the locking rod is movably connected with the relief piston, a second end of the locking rod is rotatably provided on the cylinder body, and a locking spring connected with the locking finger, the locking finger abuts to the locking rod under the action of the locking spring, when the locking mechanism is unlocked, the locking rod pushes the locking finger away from the locking ratchet to separate the locking finger from the locking ratchet.

[0034] In addition to one or more of the features described herein, or as an alternative, in further embodiments the locking rod comprises a stage, the stage is provided with a step extending towards the locking finger, the locking finger comprises an abutting face facing the step, the step comprises a mating face abutting with the abutting face and an extending face extending away from the locking finger, the mating face and the extending face intersect to form a step edge, the step edge lifts the locking finger away from the locking ratchet when the locking mechanism is unlocked.

[0035] In addition to one or more of the features described herein, or as an alternative, in further embodiments the step edge extends along the second axis and is within the extending range of the abutting face.

[0036] In addition to one or more of the features described herein, or as an alternative, in further embodiments the step edge is provided at a middle portion of the abutting face along the first axis.

[0037] In addition to one or more of the features described herein, or as an alternative, in further embodiments the locking rod further comprises a curved segment curvedly extending away from the locking finger from the stage, the extending face of the stage smoothly transitions to the curved segment; the curved segment is configured to push the locking finger away from the locking ratchet to completely separate from the locking ratchet when the locking mechanism is unlocked.

[0038] In addition to one or more of the features described above, or as an alternative, in further embodiments the locking pawl has a plurality of second teeth protruding toward the locking ratchet, the first teeth and the second teeth being shaped to match each other.

[0039] In addition to one or more of the features described above, or as an alternative, in further embodiments the first teeth have a first tooth first edge extending in a radial direction of the locking ratchet; the second teeth have a second tooth first edge extending in a radial direction of the locking ratchet; when the locking pawl is engaged with the locking ratchet, the second tooth first edge of the second teeth abuts against the first tooth first edge of the first teeth that cooperates therewith to prevent rotation of the locking ratchet in the locked state.

[0040] In addition to one or more of the features described above, or as an alternative, in further embodiments the locking pawl has a plurality of the second teeth, the plurality of second teeth being distributed along an arc matching a periphery of the locking ratchet.

[0041] In addition to one or more of the features described above, or as an alternative, in further embodiments one of the second tooth first edges of the plurality of second teeth is disposed on a median axial plane passing through a central axis of the locking ratchet and parallel to a movement direction of the locking pawl, and the rest of the second tooth first edges are disposed on an upstream side of the median axial plane in a second rotation direction of the locking ratchet, or all of the second tooth first edges are disposed on the upstream side of the median axial plane in the second rotation direction.

[0042] In addition to one or more of the features described above, or as an alternative, in further embodiments the parking cylinder further comprises a partition plate disposed between the second cavity and a service cylinder of the brake cylinder, a side of the partition plate facing the locking mechanism being provided with two guide protrusions forming a guide groove therebetween, the locking pawl being slidably accommodated in the guide groove.

[0043] To achieve one of the aforementioned objects, the present application also provides a brake cylinder with parking function, comprising: a parking cylinder according to any one of the preceding aspects; and a service cylinder comprising a brake piston, the brake piston comprising a brake piston body and a locking screw connected to the brake piston body, the locking screw and the locking ratchet of the locking mechanism forming a thread pair capable of relative movement; the locking mechanism being driven by the release piston of the parking cylinder to lock or unlock the movement of the brake piston to achieve parking brake or release.

[0044] In addition to one or more of the features described above, or as an alternative, in further embodiments the brake piston body is threadably connected to the locking screw.

[0045] To achieve one of the aforementioned objects, the present application also provides a brake caliper unit comprising the parking brake cylinder with parking function according to the aforementioned aspects.

[0046] To achieve one of the aforementioned objects, the present application also provides a rail vehicle comprising the brake caliper unit according to the aforementioned aspects.

[0047] According to the parking cylinder, the parking brake cylinder with parking function comprising the parking cylinder, and the brake caliper unit and the rail vehicle comprising the parking cylinder according to the present application, by arranging the relief piston spring sleeve on the relief piston rod, the "idle" annular space between the relief piston rod and the cylinder body is fully utilized, and the space between the end of the relief piston head facing outside the cylinder body and the cylinder body is released for the access of the hand relief pull rope and other components, which provides a more convenient and flexible installation space for the integrated compact integration of the hand relief device and the parking cylinder, and provides a parking cylinder, a parking brake cylinder with parking function, and a brake caliper unit and a rail vehicle comprising the parking cylinder, which are more compact in structure, reliable in parking brake relief, and convenient in relief operation.

[0048] And such a structural arrangement is more conducive to arranging two sets of hand relief pull ropes and related components in the limited space of the parking cylinder to meet the functional requirement of achieving manual relief of the parking brake from either side of the train.

[0049] Further, through the detachable design of the relief piston head and the relief piston rod, the relief piston spring can be conveniently installed on the relief piston rod before assembly, so that the relief piston can utilize the annular space between the relief piston rod at the end of the relief piston head facing inside the cylinder body and the cylinder body to arrange the relief piston spring, so that the space between the end of the relief piston head facing outside the cylinder body and the cylinder body can be used for the access and installation of the hand relief device, which greatly facilitates the compact design, installation and use of the integrated integration of the hand relief device and the parking cylinder.

[0050] Such an improvement can achieve the integrated access of the hand relief device without substantially increasing the size of the parking cylinder, fully ensuring the compactness of the parking cylinder structure, and further improving the operation convenience and reliability of the parking brake and the relief parking brake; at the same time, the lightweight index of the rail vehicle is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0051] The disclosure of the present application will be more apparent with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings:

[0052] Figure 1 is a schematic view of a parking brake cylinder according to an embodiment of the present application;

[0053] Figure 2 is Figure 1 is a sectional view of the parking cylinder in the parking brake state;

[0054] Figure 3 is Figure 2 is an enlarged view of A in

[0055] Figure 4 is Figure 1 is a sectional view of the parking cylinder in the parking release state;

[0056] Figure 5 is Figure 4 is an enlarged view of B in

[0057] Figure 6 is Figure 1 is a sectional view of the parking cylinder in the parking brake state from another angle;

[0058] Figure 7 is Figure 1 is a sectional view of the parking cylinder in the parking release state from another angle;

[0059] Figure 8 shows a schematic view of a locking finger according to an embodiment of the present application;

[0060] Figure 9 is an enlarged view of a locking mechanism according to an embodiment of the present application in the locked state;

[0061] Figure 9-1 shows an enlarged view of a locking mechanism of the prior art in the locked state;

[0062] Figure 10 is Figure 9 is an enlarged view of the locking mechanism in the unlocked state in

[0063] Figure 11 is Figure 10 is a partial enlarged view of the locking mechanism in the unlocked state in

[0064] Figure 12 is Figure 9is a partial enlarged view of the locking mechanism in the

[0065] Figure 13 is Figure 11 is a partial enlarged view of the locking mechanism in the

[0066] Figure 14 is Figure 10 is a partial enlarged view of the locking mechanism in the

[0067] Figure 15 is an exploded view of the parking cylinder according to an embodiment of the present application; and

[0068] Figure 16 is a perspective view of the locking rod according to an embodiment of the present application. DETAILED DESCRIPTION

[0069] The present application will be described in detail below with reference to the exemplary embodiments illustrated in the drawings. It should be understood, however, that the present application can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. These embodiments are provided so that the disclosure of the present application will be more complete and comprehensive, and will fully convey the concept of the present application to those skilled in the art.

[0070] In addition, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, those skilled in the art can easily think of continuing to make appropriate combinations or deletions between these technical features (or their equivalents), thereby obtaining more other embodiments of the present application that can not be directly mentioned herein, which do not depart from the scope of the present application.

[0071] For the convenience of describing the embodiments mentioned herein, a first axial direction and a second axial direction are introduced herein as their reference coordinate system. The directions are described for the purpose of expressing the relative positional relationship between the parts, rather than limiting the absolute positional relationship. The following text Figure 2 In the relief piston in the Figure 2 In the relief piston in the Figure 2 In the relief piston in theFigure 2 The "first axial direction" and the "second axial direction" are perpendicular to each other; the "third axial direction" is perpendicular to the "second axial direction", and the "third axial direction" is preferably perpendicular to the "first axial direction" or not.

[0072] Figure 1 It is a schematic diagram of the parking brake cylinder 1 with parking function according to an embodiment of the present application, the upper part is the parking cylinder 10, and the lower part is the normal cylinder 20. Figure 2 It is a schematic diagram of the parking cylinder 10 of Figure 1 , wherein the parking cylinder 10 is in the parking brake state, Figure 3 It is a schematic diagram of the parking cylinder 10 of Figure 2 , wherein the parking cylinder 10 is in the parking release state, Figure 4 It is an enlarged view of A in Figure 1 , wherein the parking cylinder 10 is in the parking release state, Figure 5 It is an enlarged view of B in Figure 4 .

[0073] As shown in Figure 2 and Figure 3 , the parking cylinder 10 comprises a cylinder body 100 comprising a first cavity 101 and a second cavity 102 in communication, a cylinder cover 103 assembled to the end of the first cavity 101, a locking mechanism 200 movably mounted in the second cavity 102, a release piston 110 movably mounted in the first cavity 101, and a release rope 120 connected to the release piston 110 through the cylinder cover 103. The release piston 110 comprises a release piston head 111 and a release piston rod 112 detachably connected to the release piston head 111, and a release piston spring 130 sleeved on the outer periphery of the release piston rod 112. The end of the release piston rod 112 close to the second cavity 102 extends out of the first cavity 101 and is movably connected with the locking mechanism 200. The movement of the release piston rod 112 in the first axial direction in the cylinder body 100 drives the locking mechanism 200 to enter the locking or unlocking working state, thereby realizing the parking brake or release of the parking cylinder 10.

[0074] In this arrangement, the parking cylinder described herein provides a parking cylinder with integrated manual release device and compact structure through the detachable design of the split release piston head and release piston rod. The split release piston can make full use of the annular space between the release piston rod at the end of the release piston head towards the inside of the cylinder body and the cylinder body to arrange the release piston spring, so that the space between the end of the release piston head towards the outside of the cylinder body and the cylinder body can be used for the access and installation of the manual release device, which greatly facilitates the integrated design, installation and use of the manual release device and the parking cylinder, and such improvement can be implemented almost without increasing the radial size of the parking cylinder, thereby fully ensuring the compactness of the parking cylinder structure.

[0075] Further structures of the parking cylinder will be introduced by way of example to further improve its working efficiency, reliability or other aspects.

[0076] In one embodiment, as shown in Figure 2 , the locking mechanism 200 includes a locking rod 210, a locking finger 220 and a locking ratchet 230. The locking finger 220 is movably installed in the second cavity 102, and the locking ratchet 230 is connected with the brake piston 201 (see Figure 6 or Figure 7 ) in the service cylinder 20 through a non-self-locking thread, forming a pair of thread pairs that can move relative to each other. According to specific needs, left-handed or right-handed thread pairs can be used. The first end 211 of the locking rod 210 is movably connected with the relief piston 110, specifically rotatably connected with the end of the relief piston rod 112 close to the second cavity 102, and the second end 212 of the locking rod 210 is rotatably connected to the cylinder body 100 in the second cavity 102, for example Figure 15 as shown in the exploded view of the parking cylinder in , the second end 212 of the locking rod 210 is rotatably connected to the second cavity 102 of the cylinder body 100 and the partition plate 30 via the locking rod pivot 2121 (whose two ends are arranged on the cylinder body 100 and the partition plate 30, respectively). The locking finger 220 is connected with a locking spring 250, and the locking finger 220 is abutted to the locking rod 210 under the action of the locking spring 250. The locking rod 210 and the locking spring 250 can together push the locking finger 220 and the locking ratchet 230 to engage, so that the locking mechanism 200 is in a locked state; the locking rod 210 can also push the locking finger 220 and the locking ratchet 230 apart under the pulling of the relief piston rod 112, so that the locking mechanism 200 is unlocked.

[0077] Specifically, the working principle of the parking cylinder 10 according to one embodiment of the present application is as follows:

[0078] 1) When the rail vehicle stops running and needs to be parked, as shown in Figure 2 and Figure 3 , Figure 6 and Figure 12 , the service cylinder 20 is filled with gas for braking, and then the sealed cavity 170 of the parking cylinder 10 is exhausted through the inflation channel 1014, and under the elastic force of the relief piston spring 130, the relief piston 110 moves towards the locking mechanism 200, under the pushing of the relief piston rod 112 and the action of the locking spring 250, the locking rod 210 moves down, the locking spring 250 pushes the locking finger 220 to press down, so that the tooth part of the locking finger 220 engages with the locking ratchet 230, thereby locking the locking screw 240 and the brake piston 201 (as shown in Figure 6 andFigure 12 As shown), after the gas in the service cylinder 20 is emptied, the locking ratchet 230 maintains the braking state of the brake piston 201, thereby maintaining the braking force applied by the service cylinder 20 and realizing parking braking.

[0079] 2) When it is necessary to stop the cylinder inflation to release pressure and restore normal operation of the rail vehicle, such as Figure 4 and Figure 5 As shown, the sealing cavity 170 of the parking cylinder 10 ( Figure 5 The sealing space formed between the inner wall of the first cavity 101 and the release piston 110 along the first axial direction between the sealing rings 111a and 112a constitutes the sealing cavity 170. The cavity is inflated through the inflation channel 1014, causing the release piston 110 to move away from the locking mechanism 200. The release piston spring 130 on the release piston rod 112 is compressed, and the release piston rod 112 holds the locking rod 210. The locking rod 210 lifts the locking finger 220, causing the teeth of the locking finger 220 to separate from the locking ratchet 230. The locking mechanism 200 is unlocked, the parking cylinder 10 remains in the parking and released state, and the brake piston 201 is released and reset.

[0080] 3) When insufficient air is injected into the parking cylinder and manual release of the parking brake is required, the release rope 120 can be pulled. Figure 4 and Figure 5 As shown, the tension on the release rope 120 is sequentially transmitted to the release piston head 111, the release piston rod 112, the locking rod 210, and the locking finger 220, causing the teeth of the locking finger 220 (the second tooth 222 described below) to separate from the locking ratchet 230, unlocking the locking mechanism 200, keeping the parking cylinder 10 in the parking and released state, allowing relative movement between the locking screw 240 and the locking ratchet 230, and releasing and resetting the brake piston 201.

[0081] Figure 3 The illustration specifically depicts a preferred structure of the relief piston 110, wherein the relief piston head 111 and the relief piston rod 112 are a separate design and detachably connected. The relief piston head 111 includes a first axial direction extending from its first end 1111 along a first axial direction (i.e., Figure 3The annular protrusion 1111' extends towards the relief piston rod 112 (in the left-right direction in the figure), and the relief piston rod 112 is inserted into the annular protrusion 1111' near one end of the relief piston head 111. The end of the relief piston rod 112 inserted into the annular protrusion 1111' is configured with a relief piston hole 1124 with internal threads; the second end 1112 of the relief piston head 111 opposite the first end 1111 is provided with an open cavity 1112', which communicates with the annular protrusion 1111' via a communication hole 1113, and the relief piston head 111 is connected to the relief piston rod 112 via a bolt 160 arranged in the open cavity 1112' and passing through the communication hole 1113 and threadedly connected with the relief piston hole 1124. The communication hole 1113 has a diameter smaller than that of the annular protrusion 1111' and the open cavity 1112', and the axes of the three are coaxial, and the two ends of the communication hole 1113 form a limiting or positioning structure with the annular protrusion 1111' and the open cavity 1112', which is beneficial to the coaxial assembly and fixation of the relief piston head 111 and the relief piston rod 112, thereby improving the coaxiality of the thread connection between the relief piston head 111 and the relief piston rod 112, ensuring the whole relief piston 110 to slide without deviation from the inner wall of the first cavity 101, and also being beneficial to maintaining good sealing performance.

[0082] The relief piston 110 adopts a split detachable design of the relief piston head 111 and the relief piston rod 112, which can fully utilize the annular space between the relief piston rod 112 and the cylinder body 100 to arrange the relief piston spring 130, and can use the space formed between the side of the relief piston head 111 away from the relief piston rod 112 and the cylinder body 100 for the access and installation of the manual relief device, thereby greatly facilitating the integrated design, installation and use of the manual relief device and the parking cylinder, perfecting the manual relief function of the brake cylinder, and ensuring that the brake cylinder can still reliably implement the relief operation of parking brake in the special situation of lacking brake air pressure. Moreover, it can be implemented without substantially increasing the radial size of the parking cylinder, thereby fully ensuring the compactness and light weight of the parking cylinder structure.

[0083] Further, the relief piston head 111 and the relief piston rod 112 are preferably detachably connected, which makes the installation and disassembly of the relief piston 110 more convenient, and is also beneficial to the lubrication, maintenance, replacement, etc. of the relief piston head 111, the relief piston rod 112, the relief piston spring 130 and other related components. Of course, the relief piston rod 112 can also be fixedly connected with the relief piston head 111 by welding or other connection methods after the relief piston spring 130 is sleeved.

[0084] Figure 3The outer diameter of the end of the relief piston rod 112 close to the relief piston head 111 is smaller than the inner diameter of the annular protrusion 1111', and the end of the relief piston rod 112 close to the relief piston head 111 is inserted into the annular protrusion 1111'. In this arrangement, a thread can also be formed on the end of the relief piston rod 112 close to the relief piston head 111, and a matching thread is formed on the annular protrusion 1111', and the two are directly connected by the thread, and are not limited to the bolt 160 passing through the middle portion to be connected by the thread as shown in the figure. In addition, as shown in the preferred embodiment, the end of the relief piston rod 112 close to the relief piston head 111 is configured as a flat mouth structure, and the inner hole of the annular protrusion 1111' matches the flat mouth structure to facilitate more accurate positioning and butt joint. Figure 15

[0085] In addition, in other embodiments, the end of the relief piston rod 112 close to the relief piston head 111 can also be configured as a hollow cylinder, the inner diameter of the hollow cylinder is larger than the outer diameter of the annular protrusion 1111', and the annular protrusion 1111' is inserted into the hollow cylinder. In terms of connection, an inner thread can be formed on the inner circumferential surface of the hollow cylinder, an outer thread can be formed on the outer circumferential surface of the annular protrusion 1111', and then the annular protrusion 1111' is inserted into the hollow cylinder by thread screwing.

[0086] In Figure 3 ​In the illustrated embodiment, the first cavity 101 includes a first cavity 1011, a second cavity 1012 and a third cavity 1013 which are sequentially arranged along the first axis away from the cylinder head 103. The relief piston head 111 (e.g. the main body part excluding the annular protrusion 1111’) is accommodated in the first cavity 1011, a part of the relief piston rod 112 is accommodated in the second cavity 1012, and the relief piston rod 112 is connected with the locking mechanism 200 through the third cavity 1013. In the illustrated embodiment, the relief piston rod 112 is configured with a shoulder 1121 at the middle part thereof in the first axis, the shoulder 1121 is circumferentially arranged around the axis of the relief piston rod 112, and the diameter of the shoulder 1121 is greater than the diameter of other parts of the relief piston rod 112, wherein the shoulder 1121 can slide relative to the inner wall of the cylinder along the first axis in the second cavity 1012. In an embodiment, the shoulder 1121 is circumferentially provided with a wear-resistant ring 1121’ on the side thereof which is in sliding fit with the inner wall of the cylinder, the outer diameter of the wear-resistant ring 1121’ is greater than the diameter of the shoulder 1121, and is adapted to the diameter of the second cavity 1012, so as to control the coaxiality of the relief piston rod 112 when the relief piston rod 112 is pulled, increase the guidance of the movement of the relief piston rod 112, avoid the axial deviation or deflection of the relief piston rod 112 during the movement, help the sealing members (e.g. the sealing rings 111a, 112a) at both ends of the sealing cavity 170 to maintain uniform interference fit at the contact with the relief piston 110 and the first cylinder 101, enhance the sealing reliability, improve the reliability of the parking brake or relief operation, and the wear-resistant ring 1121’ can reduce the friction between the shoulder 1121 of the relief piston rod 112 and the inner wall of the second cavity 1012 of the cylinder 100, reduce the wear of the relief piston rod 112, and improve the service life thereof. Specifically, as shown in the figure, the shoulder 1121 can be provided with an annular groove 1122, and the wear-resistant ring 1121’ in the form of an open ring with a gap is fixedly embedded in the annular groove 1122. In other embodiments, the wear-resistant ring can not be provided, but a wear-resistant layer can be provided on the outer circumferential edge of the shoulder 1121, which is in sliding fit with the inner wall of the cylinder in the second cavity 1012. In an alternative embodiment, a wear-resistant part can be circumferentially provided on the inner wall of the cylinder in the second cavity 1012, and the extension distance of the wear-resistant part along the first axis is greater than or equal to the sliding distance of the shoulder 1121 along the first axis in the first cavity 101, so that the shoulder 1121 is always in sliding fit with the wear-resistant part during the sliding process along the first axis. Figure 15 As shown, the shoulder 1121 can be provided with an annular groove 1122, and the wear-resistant ring 1121’ in the form of an open ring with a gap is fixedly embedded in the annular groove 1122. In other embodiments, the wear-resistant ring can not be provided, but a wear-resistant layer can be provided on the outer circumferential edge of the shoulder 1121, which is in sliding fit with the inner wall of the cylinder in the second cavity 1012. In an alternative embodiment, a wear-resistant part can be circumferentially provided on the inner wall of the cylinder in the second cavity 1012, and the extension distance of the wear-resistant part along the first axis is greater than or equal to the sliding distance of the shoulder 1121 along the first axis in the first cavity 101, so that the shoulder 1121 is always in sliding fit with the wear-resistant part during the sliding process along the first axis.

[0087] A relief piston spring 130 is fitted around the outer periphery of the relief piston rod 112 between the relief piston head 111 and the shoulder 1121. One end of the relief piston spring 130 near the relief piston head 111 can abut against the limiting member 131 fixedly connected to the cylinder body 100, and the other end can abut against the shoulder 1121. The limiting member 131 and the shoulder 1121 thereby restrict the displacement of the relief piston spring 130 along the first axial direction. In other embodiments, the shoulder 1121 may also be designed as a stop for stopping the relief piston spring 130 in other forms. When the sealed cavity 170 is inflated or the relief rope 120 is manually pulled, the relief piston head 111 drives the relief piston rod 112 to move along the first axis toward the cylinder head 103, and the shoulder 1121 abuts against the end of the relief piston spring 130 closest to it and compresses the relief piston spring 130; when the sealed cavity 170 is vented or the relief rope 120 is released, the elastic force of the relief piston spring 130 pushes the shoulder 1121 to move away from the first cavity 1011 along the first axis until it abuts against the end face of the second cavity 1012 away from the first cavity 1011.

[0088] like Figure 3 The diameters of the first cavity 1011, the second cavity 1012, and the third cavity 1013 shown are successively reduced, thereby forming a first abutting end face between the first cavity 1011 and the second cavity 1012 (i.e., the end face of the first cavity 1011 near the second cavity 1012), and a second abutting end face between the second cavity 1012 and the third cavity 1013 (i.e., the end face of the second cavity 1012 near the third cavity 1013). When parking brake is applied, the elastic force of the release piston spring 130 pushes the shoulder 1121 to move away from the first cavity 1011 along the first axis until it abuts against the second abutting end face; at this time, the end face of the first end 1111 of the release piston head 111 maintains a certain gap with the first abutting end face of the first cavity 1011 to reduce the inflation pressure for parking brake application or reduce the manual release pull force. Of course, in an optional embodiment, the first cavity and the second cavity can also be designed with the same diameter.

[0089] The relief piston of this application adopts a split and detachable design. Before the relief piston head 111 and relief piston rod 112 are assembled together, the relief piston spring 130 can be conveniently sleeved on the outer periphery of the relief piston rod 112, without having to arrange the relief piston spring 130 and the relief rope 120 on the same side of the relief piston head 111. This provides more space for the arrangement of the manual relief device, including the relief rope 120, in the cylinder body, and allows the use of a relief piston spring with greater elasticity.

[0090] Therefore, compared with the prior art where both the relief piston spring 130 and the manual unlocking mechanism are arranged on the outside of the relief piston head, this application has the following obvious advantages:

[0091] Firstly, the application makes full use of the "idle" space between the piston rod and the parking cylinder body to arrange the relief piston spring 130, so that the relief piston head can be used for the arrangement of the manual relief device, the overall structure is more compact and reasonable, and the defects of the prior art that the installation space is seriously insufficient and even may interfere with each other due to the relief piston spring and the manual unlocking mechanism being on the same side of the relief piston head are avoided;

[0092] Secondly, the relief piston spring 130 is sleeved on the outer circumferential surface of the relief piston rod 112, so that a relief piston spring with a larger diameter can be selected, the relief piston can obtain sufficient elastic force, and the safe and reliable implementation of the parking brake is facilitated.

[0093] Thirdly, the relief piston spring 130 of the application is arranged on the piston rod 112, which is closer to the locking rod in the locking mechanism, shortens the transmission path of the parking force, and is beneficial to the rapid and timely response of the parking brake.

[0094] In Figure 3 In the embodiment shown, the relief piston head 111 forms a seal with the first cavity 1011 via the first seal 111a, for example, the first seal 111a can be arranged in the relief piston head groove 111b circumferentially arranged along the side of the relief piston head 111; the relief piston rod 112 forms a seal with the third cavity 1013 via the second seal 112a, for example, the second seal 112a can be arranged in the cavity groove 1013b circumferentially arranged along the inner wall of the third cavity 1013, thereby forming a sealed cavity 170 between the first cavity 101 and the relief piston 110 along the first axial direction between the first seal 111a and the second seal 112a, the sealed cavity 170 can be inflated and deflated via the inflation passage 1014 to enable the relief piston 110 to move in the cylinder 100 along the first axial direction. The inflation passage 1014 can be arranged in communication with the second cavity 1012, extends along the radial direction of the relief piston rod and is arranged close to the relief piston head 111, i.e. close to the first cavity 1011. Thus, the sealed cavity 170 can be inflated more quickly and effectively, and the gas is more easily pushed to the relief piston head 111. The first seal 111a and the second seal 112a can all be O-shaped seals, rectangular seals, star-shaped seals, K-shaped seals, seals with skeletons or other suitable sealing structures.

[0095] In one embodiment, the second end 1112 of the relief piston head 111 opposite to the first end 1111 can be provided with an open bolt mounting portion 123 protruding along the first axial direction towards the relief rope 120, which has a diameter smaller than that of the second end 1112 of the relief piston 110. Threaded holes are provided in the open bolt mounting portion 123, and the relief rope 120 is connected to the relief piston 110 by the connection of the open bolt 150 and the threaded holes, wherein one end of the relief rope 120 is clamped in the open bolt 150. Since the open bolt mounting portion 123 is provided protruding from the end surface of the second end 1112 of the relief piston head 111, the axial guiding length of the relief piston head 111 (i.e. the axial length of the portion of the relief piston head 111 in contact with the inner wall of the first cavity 1011) can be designed to be shorter, so as to ensure the installation of the relief rope and reduce the weight of the relief piston head 111. The relief rope 120 can be retained by a relief rope retainer 121 fixedly connected to the cylinder cover 103 of the parking cylinder 10, and connected to the relief piston 110 through the relief rope retainer 121. A anti-disengagement member 122 can be provided at the end surface of the cylinder cover 103 facing away from the cylinder body 100, which is clamped on the relief rope retainer 121 and fixedly connected to the cylinder cover 103 by welding, bonding or the like, so as to limit the displacement of the relief rope retainer 121 along the first axial direction, thereby preventing the relief rope 120 from being pulled out of the cylinder cover 103 by external force. In addition, a sealing ring can be provided at the joint between the relief rope retainer 121 and the cylinder cover 103 to prevent dust, sewage and the like from entering the parking cylinder 10. Part of the structure of the cylinder cover 103 extends into the first cavity 1011, which not only provides a limit for the movement of the relief piston head 111, but also is more conducive to improving the overall dustproof and waterproof effect of the parking cylinder 10.

[0096] Figure 3 Two relief ropes 120 are shown in FIG. 2, and the relief piston head 111 can be radially symmetrically provided with two threaded holes at the second end 1112 thereof, and the two relief ropes 120 are connected to the relief piston 110 by the threaded connection of the two open bolts 150 and the two threaded holes, respectively. In this way, the operator can pull one of the two relief ropes 120 on one side of the train or pull the other relief rope 120 on the other side to manually relieve the parking brake, thereby providing more operation positions for manually relieving the parking brake and improving the convenience of operation. In addition, when both relief ropes 120 are pulled, the force required for pulling can be distributed to the two relief ropes 120, thereby optimizing the effect of the force. In other embodiments, other numbers and other arrangement positions of relief ropes 120 can also be provided according to the needs of the pulling position.

[0097] Therefore, under this arrangement, the parking cylinder described in this paper realizes the function of manually releasing the parking brake within a relatively small structural space. The parking cylinder has a simple and compact structure, which saves space inside the rail vehicle, is conducive to the lightweighting of the rail vehicle, and is easy to assemble and operate. It reduces the difficulty of manually releasing the parking brake and ensures the timely and effective operation of the parking cylinder for parking braking and release.

[0098] Figure 6 yes Figure 1 A cross-sectional view of the parking cylinder 10 from another angle, wherein the parking cylinder 10 is in a parking brake state; Figure 7 yes Figure 1 This is a cross-sectional view of the parking cylinder 10 from another angle, showing the parking cylinder 10 in the released state. It can be seen that the second end 1112 of the release piston head 111 is provided with a limiting pin mounting portion 141 protruding from the end face of the self-opening bolt mounting portion 123 toward the cylinder head 103. A pin hole is provided in the limiting pin mounting portion 141, and a limiting pin 140, fixedly connected to the cylinder head 103, is inserted into the pin hole to limit the circumferential deflection of the release piston 110. The protrusion distance of the limiting pin mounting portion 141 can be appropriately long to ensure that the limiting pin 140 remains inserted in the pin hole and does not dislodge during the axial movement of the release piston 110. The distance by which the pin hole is recessed inward along the first axial direction from the end face of the locating pin mounting portion 141 can be less than or equal to the protrusion distance of the locating pin mounting portion 141, meaning the pin hole extends only within the locating pin mounting portion 141; or, the distance by which the pin hole is recessed inward along the first axial direction from the end face of the locating pin mounting portion 141 can be greater than the protrusion distance of the locating pin mounting portion 141, meaning the pin hole can extend from the locating pin mounting portion to the open bolt mounting portion 123. Two locating pins 140 are shown in the figure; in other embodiments, one or more locating pins 140 may be provided depending on the locating requirements. The locating pin mounting portion 141 can be arranged in a position that does not interfere with the two threaded holes on the open bolt mounting portion 123, for example, preferably, as shown in the figure. Figure 15 Ideally, the two threaded holes on the open bolt mounting portion 123 can be arranged radially symmetrically at the second end 1112 of the piston head 111, and the limiting pin mounting portion 141 can be arranged radially symmetrically. Furthermore, the two threaded holes on the open bolt mounting portion 123 are generally arranged in a cross shape, offset 90 degrees from the limiting pin mounting portion 141 along the circumference of the second end 1112. Alternatively, in embodiments with a smaller diameter of the open bolt mounting portion 123, the limiting pin mounting portion 141 may not be located on the open bolt mounting portion 123, but rather at another location on the second end 1112.

[0099] In addition, in optional embodiments, a limit pin can also be installed on the relief piston head 111, and a limit pin mounting portion and a pin hole are provided on the cylinder cover 103. Alternatively, the limit pin can not be provided, and a boss that cooperates with a concave structure in the cylinder cover 103 is provided on the end of the relief piston head 111 close to the cylinder cover 103, and the boss and the concave structure are both designed as a non-circular contour, and the anti-rotation is achieved through cooperation of the two.

[0100] In this arrangement, the relief piston connected with the relief rope is integrally arranged in the parking cylinder according to the present application, the space occupied is small, the number of parts is small, the compactness and lightweight design index of the parking cylinder structure are improved, the convenience and safety of parking brake and parking relief implementation are ensured, which is conducive to the realization of the lightweight optimization target of the overall structure of the railway vehicle, and the practicability of the overall structure of the railway vehicle is enhanced.

[0101] Figure 8 is a schematic view of the locking finger 220 according to an embodiment of the present application, it can be seen that the locking finger 220 includes a locking finger body 221 and a tooth portion (including a second tooth 222), the locking finger body 221 includes a first locking finger section 2211 extending along the axial direction of the locking ratchet 230, and a second locking finger section 2212 extending from the end of the first locking finger section 2211 towards the locking ratchet 230 (i.e. the up-down direction in Figure 8 ), the first locking finger section 2211 and the second locking finger section 2212 form a symmetric structure with an L-shaped cross section, and preferably, the symmetry plane of the locking finger body 221 is parallel to the movement direction of the locking finger 220 (i.e. the up-down direction in Figure 9 ), and passes through the rotation axis of the locking ratchet 230. At least part of the locking rod 210 can be accommodated between the first locking finger section 2211 and the second locking finger section 2212, so that when the locking rod 210 rotates around the second end 212, the first locking finger section 2211 can be lifted, and in turn the locking finger body 221 is lifted, so that the locking finger 220 is disengaged from the locking ratchet 230, thereby realizing the unlocking of the locking mechanism 200. It should be understood that in other optional embodiments, the locking finger can also be configured as other geometric shapes that are not symmetric.

[0102] Figure 9 is an enlarged view of the locking mechanism according to an embodiment of the present application, in which the locking mechanism is in a locked state; Figure 10 is Figure 9 an enlarged view of the locking mechanism in Figure 9In the left-right direction, the locking rod 210 has a step 213 between the second end 212 of the locking rod 210 and the locking finger body 221, and further comprises a curved section 214 extending away from the locking finger 220 from the step 213. The step 213 has a step 2131 extending towards and abutting against the first locking finger section 2211. The first locking finger section 2211 of the locking finger 220 comprises an abutting surface 2213 towards the step 2131 (see Figure 8 ). As shown in the perspective view, Figure 16 The step 2131 comprises an abutting surface 2131' abutting against the abutting surface 2213 and an extending surface 2131" extending away from the locking finger 220 (which smoothly transitions to the curved section 214), the abutting surface 2131' and the extending surface 2131" form a step edge 2132 at the intersection. The abutting surface 2131' of the step 2131 is higher than the surface of the locking rod towards the first locking finger section 2211. The step edge 2132 extends along the second axial direction and is within the extending range of the abutting surface 2213, i.e. in the first axial direction (the left-right direction in Figure 9 The position of the step edge 2132 can vary left and right within the width of the abutting surface 2213 in the left-right direction. When the locking mechanism 200 is locked, the abutting surface 2131' of the step 2131 abuts against the abutting surface 2213 of the first locking finger section 2211; when the locking mechanism 200 is unlocked, the step edge 2132 of the step 2131 pushes the locking finger 220 away from the locking ratchet 230.

[0103] As shown in the perspective view, Figure 9 When the parking brake release action is initiated, the frictional resistance on the meshing tooth pair of the locking finger 220 and the locking ratchet 230 is the largest, due to the step 2131 of the locking rod 210 abutting against the first locking finger section 2211, the power arm of the locking rod 210 is L1 and the resistance arm is L2, the resistance arm is the shortest in this state, the amplification of the release force of the locking rod 210 on the release piston 110 is the largest, so that the parking brake release operation can be performed with smaller release force, and it is ensured that the locking rod 210 can push the locking finger 220 to move. Preferably, the step edge 2132 can be arranged close to the symmetry plane of the locking finger body 221 (i.e. at the dotted vertical line in Figure 9 ), or arranged at the middle part of the abutting surface 2213 along the first axial direction, so as to more smoothly and effectively lift the locking finger 220 during the unlocking operation.

[0104] The existing locking rod without step has the contact position of the locking rod close to the edge of the locking finger away from the second end 212 (i.e. at the dotted vertical line in Figure 9-1The left edge of the locking finger in the locking rod), the resistance arm L2' is relatively long, so the maximum amplification factor of the locking rod to the release piston is about 2.5. During the entire parking and release process, the force amplification factor of the locking rod is maintained between 1.7 and 2.5 (the force amplification factor mainly depends on the ratio of the power arm to the resistance arm). The force amplification factor is relatively low, so a large pulling force needs to be applied to the release piston during the entire release process. In contrast, the stepped design of the locking rod 210 in this application optimizes the force application structure of the locking rod 210 without changing the original basic size of the locking rod 210. The existence of the stepped structure that is higher than the surface of the locking rod contour makes the contact position between the locking rod 210 and the locking finger 220 more to the right at the beginning of the parking and release action, that is, the resistance arm L2 ( Figure 9 The length of the locking rod 210 (as shown) is shorter, which allows the locking rod 210 to amplify the pulling force on the release piston by up to about 3.6 times. This reduces the release force required for the parking release operation, lowers the difficulty of operation, and improves the convenience of the parking release operation. It realizes a locking mechanism with a compact structure, better force amplification effect, and convenient operation, thereby improving the overall performance of the parking cylinder.

[0105] like Figure 10 As shown, as the release action proceeds, the meshing area of ​​the locking finger 220 and the locking ratchet 230 gradually decreases, and the frictional resistance on the meshing surface also gradually decreases. Meanwhile, the contact position between the locking rod 210 and the lower surface of the first locking finger section 2211 gradually shifts to the curved section 214. The power arm of the locking rod 210 remains L1, while the resistance arm becomes L3. In this state, the resistance arm increases, and the amplification factor of the release pull of the locking rod 210 on the release piston 110 decreases. However, the displacement of the locking finger 220 driven by the locking rod 210 along the movement away from the locking ratchet 230 increases, thereby ensuring that the locking finger 220 and the locking ratchet 230 are completely unlocked.

[0106] Therefore, the segmented design of the locking lever 210 with its stepped and curved sections effectively facilitates the unlocking of the locking finger 220 and the locking ratchet 230, and also effectively reduces the maximum pulling force, improving the convenience and effectiveness of the parking and unlocking operation.

[0107] Figure 11 yes Figure 10 Enlarged view of the locking mechanism 200 in the middle. Figure 12 yes Figure 9 An enlarged view of the locking mechanism 200, in which... Figure 11 The locking mechanism is in the unlocked state. Figure 12 The locking mechanism is in the locked state. When the brake cylinder performs the braking action, the brake piston 201 of the common cylinder 20 drives the locking screw 240 to extend away from the locking ratchet 230 along its axial direction. At this time, the locking ratchet 230 extends along the first direction of rotation (i.e., with the threaded pair) under the action of the threaded pair. Figure 11The piston rotates in the opposite direction of the arc-shaped arrow in the diagram. When the brake is released, the brake piston 201 of the common cylinder 20 drives the locking screw 240 to retract along its axial direction towards the opposite locking ratchet 230. At this time, the locking ratchet 230 rotates in the second direction (i.e., the opposite direction of the arc-shaped arrow in the diagram) under the action of the threaded pair. Figure 11 The direction of the arc-shaped arrow in the image rotates.

[0108] like Figure 9- Figure 11 As shown, the rotation axis of the locking ratchet 230 is arranged on the plane of symmetry of the locking finger body 221 (i.e., represented by the vertical dotted line perpendicular to the first axis shown in the figure). Figure 11-12 As shown, the locking ratchet 230 has a plurality of first teeth 231 along its entire outer periphery, and the locking finger 220 has a locking finger body 221 and a second tooth 222 protruding from the locking finger body 221 toward the locking ratchet 230. The first teeth 231 and the second teeth 222 are matched in shape so that they can mesh with each other to lock the locking mechanism 200.

[0109] More specifically, the first tooth 231 has a first tooth first side 2311 and a first tooth second side 2312, the first tooth first side 2311 being along the radial direction of the locking ratchet 230 (e.g., Figure 11 (Indicated by a dotted line in the radial direction) Extending, the second side 2312 of the first tooth forms a first angle α with the first side 2311 of the first tooth along the direction of the first rotation. The second tooth 222 has a first side 2221 and a second side 2222, and the first side 2221 of the second tooth also extends in the radial direction of the locking ratchet 230 (as shown by a dotted line in the radial direction). Figure 12- Figure 13 As shown), the second side 2222 of the second tooth and the first side 222 of the second tooth form a second angle b. The second angle b is equal to or less than the first angle a.

[0110] Under this structural arrangement, such as Figure 12As shown, when the locking finger body 221 moves downward, the second teeth 222 can smoothly engage with the first teeth 231, and since the first tooth first edges 2311 of the first teeth 231 and the second tooth first edges 2221 of the second teeth 222 extend along the radial direction of the locking ratchet 230, for example, the first teeth 231 and the second teeth 222 engaged on both sides of the symmetry plane of the locking finger body 221, the second tooth first edge 2221 of the second teeth 222 abuts against the first tooth first edge 2311 of the first teeth 231 matched therewith, and the acting force therebetween is the same as the tangential direction of the speed of the rotation of the locking ratchet 230 at the contact position of the two, i.e. the left-right direction in the figure, without the component force along the movement direction of the locking finger body 221, i.e. the up-down direction in the figure, thereby preventing the pushing force of the torque of the locking ratchet 230 in the locking state on the locking finger 220 along the movement direction of the locking finger body 221, effectively avoiding the loosening or even unlocking of the engagement between the locking finger 220 and the locking ratchet 230 due to the excessive torque of the locking ratchet 230, thereby significantly improving the effectiveness and reliability of the locking mechanism. In addition, the inclined configuration of the first tooth second edges 2312 and the second tooth second edges 2222 enables the locking finger 220 to form a one-way rotation constraint on the locking ratchet 230, so that the locking ratchet 230 cannot be reversed (i.e. rotated in the second rotational direction) in the locking state.

[0111] In order to improve the strength of the teeth on the locking finger 220, a plurality of second teeth 222 can be designed to simultaneously engage with a plurality of first teeth 231 of the locking ratchet 230, for example Figure 11-13 Three second teeth 222 are shown in the figure, and in other embodiments, other numbers of second teeth 222 can also be designed according to actual needs. For example Figure 13 As shown, the plurality of second teeth 222 are distributed along a circular arc matching the outer periphery of the locking ratchet (the locking ratchet is omitted for clarity) to engage with the plurality of first teeth 231 of the outer periphery of the locking ratchet 230.

[0112] In addition, in the preferred embodiment, the second tooth first edges 2221 of the plurality of second teeth 222 can be arranged on the central axis plane (i.e. the symmetry plane of the locking finger body 221 in the illustrated embodiment) passing through the center axis of the locking ratchet 230 and parallel to the movement direction of the locking finger 220 or the upstream side of the central axis plane in the second rotational direction, specifically, for example Figure 11-13As shown, the second tooth first edge 2221 of the second tooth 222 on the rightmost side of the figure can be at the symmetry plane of the locking finger body 221, and the second tooth first edges 2221 of the other second teeth 222 can be located to the left of the symmetry plane, extending along the radial dotted line in the figure, i.e., in the radial direction passing through the central axis of the locking ratchet 230. If the plurality of second teeth 222 of the locking finger 220 are designed to be biased to the other side of the symmetry plane (for example, the right side as shown), when the locking finger 220 is translated downward, the second teeth 222 will interfere with the first teeth 231 of the locking ratchet 230 and cannot be inserted into the gap between the first teeth 231, so that the meshing cannot be completed, thereby affecting the locking or unlocking function of the locking mechanism 200.

[0113] Figure 14 is Figure 10 an enlarged view of the locking mechanism in Figure 15 , which specifically shows the structure of the partition plate 30 and the guide protrusion 31, and its three-dimensional structure can also be seen inThe partition plate 30 is arranged between the second cavity 102 and the normally used cylinder 20 of the brake cylinder 1, and the side of the partition plate 30 facing the locking mechanism 200 is provided with two guide protrusions 31, a guide groove 311 is formed between the two guide protrusions 31, and the locking finger body 221 is slidably accommodated in the guide groove 311. The guide protrusion 31 can be made of steel or iron material, which has high strength and better wear resistance, can strengthen the movement guidance of the locking finger 220, and avoid the phenomenon that the locking finger 220 moves away from the locking ratchet 230 due to the locking torque of the locking ratchet 230 in the locked state, causing the locking to fail. At the same time, it also helps to reduce the wear caused by the movement of the locking finger 220 away from the center position to the sliding groove on the cylinder body 100 (which is used to initially position the locking finger during installation and is not shown in the figure), thereby providing better protection for the cylinder body 100.

[0114] Figure 15 is an exploded view of the parking cylinder 10 according to an embodiment of the present application, and the following describes the installation sequence of the parking cylinder 10 according to the present application based on Figure 15

[0115] 1) Parking relief part: first, the relief piston rod 112 is installed into the cylinder body 100 of the parking cylinder 10, then the relief piston spring 130 is sleeved onto the relief piston rod 112, and the relief piston spring limiting piece 131 is installed on the cylinder body 100; then the relief piston head 111 is installed into the cylinder body 100 of the parking cylinder 10, and is fixedly connected with the relief piston rod 112 through the bolt 160; if the relief rope 120 needs to be installed, one end of the relief rope 120 is first threaded through the cylinder cover 103 of the parking cylinder 100 and installed into the open bolt 150, and then the open bolt 150 is fixedly installed on the relief piston head 111; finally, the cylinder cover 103 is installed to the side end of the parking cylinder 10 through the bolt fastener.

[0116] 2) Locking mechanism part: first, install the locking finger 220 into the sliding groove of the cylinder body 100; then, install the locking rod 210 into the cylinder body 100, and install the ball head on the end of the relief piston rod 112 close to the locking rod 210 into the U-shaped groove 2111 on the first end 211 of the locking rod 210; after adjusting the locking rod 210 to the appropriate position, install the locking rod rotating pin 2121, and rotatably connect the locking rod 210 (i.e. the second end 212) to the cylinder body 100; then, install the bearing 402, the locking ratchet 230, and the bearing 401 in sequence; finally, fix the partition plate 30 to the cylinder body 100 of the parking cylinder 10 by means of bolts.

[0117] The above installation sequence is only exemplary, and the installation sequence of all the involved components is not described in detail for the purpose of brevity, and can be adjusted as needed in practice.

[0118] The above examples mainly illustrate the parking cylinder of the present application, the brake cylinder with parking function comprising the parking cylinder, and the railway vehicle comprising the brake cylinder with parking function. Although only some of the embodiments of the present application are described, it should be appreciated by those skilled in the art that the present application can be implemented in many other forms without departing from the spirit and scope thereof. Therefore, the examples and embodiments shown are considered illustrative rather than limiting, and the present application can encompass various modifications and alternatives without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. A parking cylinder for use in a brake cylinder with a parking function, characterized in that, The parking cylinder (10) includes: The cylinder body (100) includes a first cavity (101) and a second cavity (102) in communication. A locking mechanism (200) is movably mounted within the second cavity (102) and has both locking and unlocking operating states; and The release piston (110) is movably installed in the first cavity (101) and forms a sealed cavity (170) with the inner wall of the cylinder (100). The movement of the release piston (110) along the first axis in the first cavity (101) drives the locking mechanism (200) into the locking or unlocking working state, thereby realizing the parking braking or release of the parking cylinder (10). The relief piston (110) includes a relief piston head (111), a relief piston rod (112), and a relief piston spring (130). The relief piston spring (130) is arranged inside the sealing cavity (170) and sleeved on the outer periphery of the relief piston rod (112). One end of the relief piston spring (130) near the relief piston head (111) abuts against the cylinder body (100), and the other end abuts against a stop portion provided on the relief piston rod (112). The end of the relief piston rod (112) away from the relief piston head (111) extends out of the first cavity (101) and is movably connected to the locking mechanism (200) installed in the second cavity (102). The locking mechanism (200) includes: A locking finger (220) is movably mounted in the second cavity (102); A locking ratchet (230) is connected to a brake piston (201) in the common cylinder (20) of the brake cylinder, forming a threaded pair that can move relative to each other; the locking finger (220) engages or disengages with the locking ratchet (230), thereby locking or unlocking the locking mechanism (200); A locking lever (210) is disposed between the locking finger (220) and the locking ratchet (230), a first end (211) of the locking lever (210) being movably connected to the release piston (110), and a second end (212) of the locking lever (210) being rotatably disposed on the cylinder (100); and A locking spring (250) is connected to the locking finger (220). Under the action of the locking spring (250), the locking finger (220) abuts against the locking rod (210). When the locking mechanism (200) is unlocked, the locking rod (210) pushes the locking finger (220) away from the locking ratchet (230) to separate the locking finger (220) from the locking ratchet (230); and The locking lever (210) includes a platform (213), on which a step (2131) extending toward the locking finger (220) is provided. The locking finger (220) includes an abutment surface (2213) facing the step (2131). The step (2131) includes a mating surface (2131') abutting the abutment surface (2213) and an extension surface (2131") extending away from the locking finger (220). The intersection of the mating surface (2131') and the extension surface (2131") forms a step edge (2132). When the locking mechanism (200) is unlocked, the step edge (2132) pushes the locking finger (220) away from the locking ratchet (230).

2. The parking cylinder according to claim 1, characterized in that, The end of the relief piston rod (112) near the relief piston head (111) is detachably connected to the relief piston head (111).

3. The parking cylinder according to claim 2, characterized in that, The end of the relief piston rod (112) near the relief piston head (111) is connected to the relief piston head (111) via a snap ring.

4. The parking cylinder according to claim 2, characterized in that, The end of the relief piston rod (112) near the relief piston head (111) is connected to the relief piston head (111) by a thread.

5. The parking cylinder according to claim 4, characterized in that, The relief piston head (111) includes a first end (1111) near the relief piston rod (112) and an annular protrusion (1111') extending from the first end (1111) toward the relief piston rod (112) along a first axial direction.

6. The parking cylinder according to claim 5, characterized in that, The end of the relief piston rod (112) near the relief piston head (111) is constructed as a hollow cylinder, the inner diameter of which is larger than the outer diameter of the annular protrusion (1111'), and the annular protrusion (1111') is inserted into the hollow cylinder.

7. The parking cylinder according to claim 6, characterized in that, The inner circumferential surface of the hollow cylinder is constructed with internal threads, and the outer circumferential surface of the annular protrusion (1111') is constructed with external threads. The annular protrusion (1111') is inserted into the hollow cylinder by means of threaded screwing.

8. The parking cylinder according to claim 5, characterized in that, The outer diameter of the end of the relief piston rod (112) near the relief piston head (111) is smaller than the inner diameter of the annular protrusion (1111'), and the end of the relief piston rod (112) near the relief piston head (111) is inserted into the annular protrusion (1111').

9. The parking cylinder according to claim 8, characterized in that, The outer circumferential surface of the relief piston rod (112) near the relief piston head (111) is provided with an external thread, and the inner circumferential surface of the annular protrusion (1111') is provided with an internal thread. The end of the relief piston rod (112) near the relief piston head (111) is inserted into the annular protrusion (1111') by means of thread screwing.

10. The parking cylinder according to claim 8, characterized in that, The relief piston rod (112) has a relief piston hole (1124) with internal threads at one end near the relief piston head (111); the second end (1112) of the relief piston head (111) opposite to the first end (1111) is provided with an opening (1112'), the opening (1112') communicates with the annular protrusion (1111') via a connecting hole (1113), and the relief piston head (111) is connected to the relief piston rod (112) via a bolt (160) arranged in the opening (1112') and passing through the connecting hole (1113) and threadedly connected to the relief piston hole (1124).

11. The parking cylinder according to claim 1, characterized in that, The stop portion includes a shoulder (1121) circumferentially disposed at the axial center of the relief piston rod (112), the shoulder (1121) slidingly engaging with the inner wall of the first cavity (101), and the end of the relief piston spring (130) away from the relief piston head (111) abutting against the shoulder (1121).

12. The parking cylinder according to claim 11, characterized in that, The shoulder (1121) has a wear-resistant ring (1121') circumferentially arranged on its side. The outer diameter of the wear-resistant ring (1121') is larger than the diameter of the shoulder (1121). The wear-resistant ring (1121') slides in fit with the inner wall of the first cavity (101).

13. The parking cylinder according to claim 12, characterized in that, The shoulder (1121) has an annular groove (1122) circumferentially provided on its side, and the wear-resistant ring (1121') is fixedly or detachably embedded in the annular groove (1122); the wear-resistant ring (1121') is constructed as an open ring with a gap.

14. The parking cylinder according to claim 11, characterized in that, The relief piston head (111) forms a sliding seal with the inner wall of the portion of the first cavity (101) away from the second cavity (102), and the end of the relief piston rod (112) away from the relief piston head (111) forms a sliding seal with the inner wall of the portion of the first cavity (101) near the second cavity (102).

15. The parking cylinder according to claim 1 or 14, characterized in that, The relief piston head (111) forms a sliding seal with the inner wall of the first cavity (101) via the first seal (111a), and the end of the relief piston rod (112) away from the relief piston head (111) forms a sliding seal with the inner wall of the first cavity (101) via the second seal (112a), thereby forming the sealing cavity (170) between the relief piston (110) and the inner wall of the first cavity (101) along the first axial direction between the first seal (111a) and the second seal (112a).

16. The parking cylinder according to claim 15, characterized in that, The relief piston head (111) is provided with a relief piston head groove (111b) circumferentially on its side, and the first sealing element (111a) is arranged in the relief piston head groove (111b). The first sealing element is any one of the following: O-ring, rectangular sealing ring, star-shaped sealing ring, K-ring, or sealing ring with skeleton.

17. The parking cylinder according to claim 15, characterized in that, The first cavity (101) has a cavity groove (1013b) circumferentially provided on its inner wall, and the second sealing element (112a) is arranged in the cavity groove (1013b). The second sealing element (112a) is any one of the following: O-ring, rectangular sealing ring, star-shaped sealing ring, K-ring, or sealing ring with skeleton.

18. The parking cylinder according to claim 15, characterized in that, The first cavity (101) is also provided with an inflation channel (1014), which is connected to the sealing cavity (170) to inflate the sealing cavity (170) or vent air from the sealing cavity (170).

19. The parking cylinder according to claim 18, characterized in that, The inflation channel (1014) extends radially along the relief piston rod (112) and is located close to the relief piston head (111).

20. The parking cylinder according to claim 1, characterized in that, The parking cylinder (10) further includes a cylinder head (103) fitted to the end of the first cavity (101) remote from the second cavity (102); and A relief rope (120) passes through the cylinder head (103) and is connected to the second end (1112) of the relief piston head (111) away from the relief piston rod (112).

21. The parking cylinder according to claim 20, characterized in that, The second end (1112) of the relief piston head (111) is provided with an open bolt mounting part (123) protruding toward the relief rope (120), the diameter of the open bolt mounting part (123) being smaller than the diameter of the second end (1112); one end of the relief rope (120) is engaged in the open bolt (150), the open bolt (150) being installed in the open bolt mounting part (123) to connect the relief rope (120) to the relief piston head (111).

22. The parking cylinder according to claim 21, characterized in that, Two threaded holes are radially symmetrically provided on the open bolt mounting part (123), and the two relief ropes (120) are connected to the relief piston (110) by the threaded connection of the two open bolts (150) to the two threaded holes respectively.

23. The parking cylinder according to claim 21, characterized in that, The relief piston head (111) also includes a limiting pin mounting portion (141) provided at the second end (1112) and a pin hole recessed from the end face of the limiting pin mounting portion (141) along the first axial direction. The limiting pin (140) fixedly connected to the cylinder head (103) is inserted into the pin hole to limit the circumferential deflection of the relief piston (110).

24. The parking cylinder according to claim 23, characterized in that, The limiting pin mounting portion (141) is configured to protrude from the end face of the open bolt mounting portion (123) toward the cylinder head (103); the pin hole is recessed from the end face of the limiting pin mounting portion (141) by a distance less than or equal to the protruding distance of the limiting pin mounting portion (141), or the pin hole is recessed from the end face of the limiting pin mounting portion (141) by a distance greater than the protruding distance of the limiting pin mounting portion (141).

25. The parking cylinder according to claim 20, characterized in that, The parking cylinder (10) also includes a relief rope retainer (121), which is arranged along a first axial direction and connected to the cylinder head (103). The relief rope (120) is held by the relief rope retainer (121) and passes through the relief rope retainer (121) to connect to the relief piston head (111).

26. The parking cylinder according to claim 25, characterized in that, The parking cylinder (10) also includes an anti-detachment component (122), which abuts against and is fixed to the end face of the cylinder cover (103) opposite to the cylinder body (100) and is engaged with the relief rope retainer (121) to limit the displacement of the relief rope retainer (121) along the first axis.

27. The parking cylinder according to claim 1, characterized in that, The step edge (2132) extends along the second axis and is within the extension range of the abutment surface (2213).

28. The parking cylinder according to claim 27, characterized in that, The step edge (2132) is located at the middle of the abutment surface (2213) along the first axial direction.

29. The parking cylinder according to claim 1, characterized in that, The locking lever (210) also includes a curved section (214) extending from the platform stage (213) away from the locking finger (220), the extension surface (2131) of the platform stage (213) smoothly transitioning to the curved section (214); the curved section (214) is configured to push the locking finger (220) away from the locking ratchet (230) until it is completely separated from the locking ratchet (230) when the locking mechanism (200) is unlocked.

30. The parking cylinder according to claim 1, characterized in that, The locking ratchet (230) has a plurality of first teeth (231) along its outer circumference, and the locking finger (220) has a second tooth (222) protruding toward the locking ratchet (230), wherein the first teeth (231) and the second teeth (222) are matched in shape.

31. The parking cylinder according to claim 30, characterized in that, The first tooth (231) has a first tooth first side (2311) extending in the radial direction of the locking ratchet (230). The second tooth (222) has a second tooth first side (2221) extending in the radial direction of the locking ratchet (230); when the locking finger (220) engages with the locking ratchet (230), the second tooth first side (2221) of the second tooth (222) abuts against the first tooth first side (2221) of the first tooth (231) that engages with it, so as to prevent the rotation of the locking ratchet (230) in the locked state.

32. The parking cylinder according to claim 31, characterized in that, The locking finger (220) has a plurality of second teeth (222) distributed along an arc that matches the outer periphery of the locking ratchet (230).

33. The parking cylinder according to claim 32, characterized in that, One of the plurality of second teeth (222) has its first side (2221) disposed on the central axis surface passing through the central axis of the locking ratchet (230) and parallel to the direction of movement of the locking finger (220); the remaining first sides (2221) of the second teeth are disposed on the upstream side of the central axis surface along the second direction of rotation of the locking ratchet (230); or the first sides (2221) of the second teeth of all the second teeth (222) are disposed on the upstream side of the central axis surface along the second direction of rotation.

34. The parking cylinder according to claim 1, characterized in that, The parking cylinder also includes a partition (30) disposed between the second cavity (102) and the common cylinder of the brake cylinder. Two guide protrusions (31) are provided on the side of the partition (30) facing the locking mechanism (200), and a guide groove (311) is formed between the two guide protrusions (31). The locking finger (220) is slidably accommodated in the guide groove (311).

35. A parking cylinder for use in a brake cylinder with a parking function, characterized in that, The parking cylinder (10) includes: The cylinder body (100) includes a first cavity (101) and a second cavity (102) in communication. Cylinder head (103), which is fitted to the end of the first cavity (101) away from the second cavity (102); The locking mechanism (200) is movably installed in the second cavity (102) and has two working states: locking and unlocking. A release piston (110) is movably mounted in the first cavity (101) and forms a sealed cavity (170) with the inner wall of the cylinder (100). The movement of the release piston (110) along the first axial direction in the first cavity (101) drives the locking mechanism (200) into a locking or unlocking working state, thereby realizing the parking braking or release of the parking cylinder (10). The release piston (110) includes a release piston head (111), a release piston rod (112), and a release piston spring (130). The relief piston spring (130) is arranged inside the sealed cavity (170) and sleeved on the outer periphery of the relief piston rod (112). One end of the relief piston spring (130) near the relief piston head (111) abuts against the cylinder body (100), and the other end abuts against the stop portion provided on the relief piston rod (112). The end of the relief piston rod (112) away from the relief piston head (111) extends out of the first cavity (101) and is movably connected to the locking mechanism (200) installed in the second cavity (102). A relief rope (120) passes through the cylinder head (103) and connects to the second end (1112) of the relief piston (110) away from the second cavity (102). The relief rope (120) can pull the relief piston (110) along a first axial direction and drive the locking mechanism (200) to unlock via the relief piston (110), thereby realizing the parking relief of the parking cylinder (10). The locking mechanism (200) includes: A locking finger (220) is movably mounted in the second cavity (102); A locking ratchet (230) is connected to a brake piston (201) in the common cylinder (20) of the brake cylinder, forming a threaded pair that can move relative to each other; the locking finger (220) engages or disengages with the locking ratchet (230), thereby locking or unlocking the locking mechanism (200); A locking lever (210) is disposed between the locking finger (220) and the locking ratchet (230), a first end (211) of the locking lever (210) being movably connected to the release piston (110), and a second end (212) of the locking lever (210) being rotatably disposed on the cylinder (100); and A locking spring (250) is connected to the locking finger (220). Under the action of the locking spring (250), the locking finger (220) abuts against the locking rod (210). When the locking mechanism (200) is unlocked, the locking rod (210) pushes the locking finger (220) away from the locking ratchet (230) to separate the locking finger (220) from the locking ratchet (230); and The locking lever (210) includes a platform (213), on which a step (2131) extending toward the locking finger (220) is provided. The locking finger (220) includes an abutment surface (2213) facing the step (2131). The step (2131) includes a mating surface (2131') abutting the abutment surface (2213) and an extension surface (2131") extending away from the locking finger (220). The intersection of the mating surface (2131') and the extension surface (2131") forms a step edge (2132). When the locking mechanism (200) is unlocked, the step edge (2132) pushes the locking finger (220) away from the locking ratchet (230).

36. The parking cylinder according to claim 35, characterized in that, The parking cylinder (10) includes two relief ropes (120), which are connected via open bolts (150) to two radially symmetrically arranged threaded holes on the second end (1112).

37. A brake cylinder with a parking function, characterized in that, The brake cylinder with parking function includes: The parking cylinder (10) according to any one of claims 1-34 or the parking cylinder (10) according to any one of claims 35-36; and A common cylinder (20) includes a brake piston (201), the brake piston (201) includes a brake piston body and a locking screw (240) connected to the brake piston body, the locking screw (240) and the locking ratchet (230) of the locking mechanism (200) form a threaded pair that can move relative to each other; The locking mechanism (200) locks or unlocks the movement of the brake piston (201) under the drive of the release piston (110) of the parking cylinder (10) to achieve parking braking or release.

38. The brake cylinder with parking function according to claim 37, characterized in that, The brake piston body is threadedly connected to the locking screw (240).

39. A brake caliper unit, characterized in that, The brake caliper unit includes a brake cylinder with parking function as described in claim 37 or 38.

40. A rail vehicle, characterized in that, The rail vehicle includes the brake caliper unit according to claim 39.

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