With a parking brake cylinder, rail vehicle

Abstract

The present invention discloses a parking brake cylinder and a rail vehicle with a parking brake cylinder. The parking brake cylinder includes: a brake cylinder assembly, a thrust sleeve assembly is power-coupled to an adjusting shaft assembly, a first end of a lever assembly presses against a brake piston, a second end presses against the thrust sleeve assembly, and a thrust support assembly is connected to the thrust sleeve assembly; a parking cylinder assembly, a parking elastic member is elastically connected between a parking piston and a parking cover plate, a parking transmission rod assembly is connected to the parking piston and a parking amplification mechanism, and the parking amplification mechanism is connected to the thrust support assembly. The parking brake cylinder of the present invention realizes the coupling of the internal force transmission paths between the parking cylinder assembly and the brake cylinder assembly through the thrust support assembly. The parking brake cylinder can output a braking force for braking and a parking force for parking through the adjusting shaft assembly, and both the brake cylinder assembly and the parking cylinder assembly have the function of internal force amplification, so that a greater braking force or parking force can be output.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle braking systems, and more particularly, relates to a parking brake cylinder and a rail vehicle having the same. Background Art

[0002] The existing basic braking device of rail vehicles mainly includes a brake caliper unit, a brake disc and brake pads. The brake caliper unit is one of the key parts of the braking system and plays a crucial role in the safe operation of the vehicle.

[0003] Rail vehicles are generally equipped with a brake cylinder and a parking cylinder. The brake cylinder is used for braking during driving and has relatively greater braking force, and the parking cylinder is used for outputting parking force during parking. With the development of vehicles towards high speed, the requirements for the braking force and parking force of the brake cylinder are also continuously increasing.

[0004] In the related art, the brake cylinder generally relies on an external lever to achieve force amplification, that is, the basic braking device generally only has a first-level amplification function, and the brake cylinder and the parking cylinder are separately arranged, resulting in a low integration degree of the entire braking system, occupying a large assembly space, and there is room for improvement. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a parking brake cylinder, which can output braking force for braking and parking force for parking.

[0006] The parking brake cylinder according to an embodiment of the present invention includes: a brake cylinder assembly, the brake cylinder assembly including a brake cylinder body, a brake cylinder head connected to the brake cylinder body, and an adjusting shaft assembly. The brake cylinder body and the brake cylinder head define a brake chamber, and a brake piston, a thrust sleeve assembly, a lever assembly and a thrust support assembly are arranged in the brake chamber. The thrust sleeve assembly is power-coupled to the adjusting shaft assembly. The first end of the lever assembly presses against the brake piston, and the second end presses against the thrust sleeve assembly. The thrust support assembly is connected to the thrust sleeve assembly; a parking cylinder assembly, the parking cylinder assembly including a parking cylinder body, a parking cover plate and a parking amplification mechanism. The parking cylinder body is connected to the brake cylinder head, and the parking cylinder body is connected to the parking cover plate to define a parking chamber. A parking piston, a parking elastic member and a parking transmission rod assembly are arranged in the parking chamber. The parking elastic member is elastically connected between the parking piston and the parking cover plate. The parking transmission rod assembly is connected to the parking piston and the parking amplification mechanism, and the parking amplification mechanism is connected to the thrust support assembly.

[0007] The parking brake cylinder according to the embodiment of the present invention realizes the coupling of the internal force transmission path between the parking cylinder assembly and the brake cylinder assembly through the thrust support assembly. The parking brake cylinder can output the braking force for braking and the parking force for parking through the adjusting shaft assembly, and both the brake cylinder assembly and the parking cylinder assembly have the function of internal force amplification, so that a greater braking force or parking force can be output.

[0008] For the parking brake cylinder according to an embodiment of the present invention, the axis of the parking piston is perpendicular to the axis of the brake piston, the movement direction of the thrust support assembly is perpendicular to the axis of the parking transmission rod assembly, and the axis of the parking transmission rod assembly is parallel to the axis of the parking piston.

[0009] For the parking brake cylinder according to an embodiment of the present invention, the thrust support assembly includes: a connecting ring, the connecting ring is connected to the thrust sleeve assembly, and the outer peripheral surface of the connecting ring has a connecting ring shaft; a support bearing, the support bearing is sleeved outside the connecting ring shaft and cooperates with the parking amplification mechanism.

[0010] For the parking brake cylinder according to an embodiment of the present invention, the inner peripheral wall of the connecting ring has an internal thread for threadedly connecting with the thrust sleeve assembly.

[0011] For the parking brake cylinder according to an embodiment of the present invention, both the inner peripheral wall of the connecting ring and the outer peripheral wall of the thrust sleeve assembly have positioning sub-grooves, and the two positioning sub-grooves form a positioning groove. The connecting ring and the thrust sleeve assembly are positioned by a positioning pin provided in the positioning groove.

[0012] For the parking brake cylinder according to an embodiment of the present invention, there are two connecting ring shafts, and the two connecting ring shafts are arranged away from each other along the circumferential direction of the connecting ring. There are two support bearings and they correspond to the connecting ring shafts one by one.

[0013] For the parking brake cylinder according to an embodiment of the present invention, the connecting ring shaft is integrally formed with the connecting ring.

[0014] For the parking brake cylinder according to an embodiment of the present invention, the parking amplification mechanism has a driving surface, and the angle between the tangent of at least one place of the driving surface and the axis of the parking amplification mechanism is an acute angle.

[0015] According to an embodiment of the parking brake cylinder of the present invention, the driving surface has a limit groove and a driving section, the driving section is connected to the end of the limit groove away from the parking piston, the angle between the tangent of the driving section and the axis of the parking amplification mechanism is smaller than the angle between the tangent of the connection between the limit groove and the driving section and the axis of the parking amplification mechanism, when the parking cylinder is relieved, the support bearing presses against the wall of the limit groove, and when the parking cylinder is working, the support bearing presses against the driving section.

[0016] According to the parking brake cylinder of one embodiment of the present invention, the driving section is arc-shaped, and the center of curvature is located on a side of the driving surface away from the brake cylinder body.

[0017] According to the parking brake cylinder of one embodiment of the present invention, the limiting groove includes a plurality of arc segments connected in sequence.

[0018] According to an embodiment of the present invention, the lever assembly with a parking brake cylinder includes: a lever body, a middle portion of which is pivotally mounted on the brake cylinder body via an intermediate support shaft, a first bearing is mounted on the first end of the lever body via a first pin shaft, and a second bearing is mounted on the second end of the lever body via a second pin shaft, the first bearing presses against the brake piston, and the second bearing presses against the thrust sleeve assembly.

[0019] According to an embodiment of the present invention, the lever assembly with a parking brake cylinder includes: a bushing and an intermediate support shaft. A through hole is provided in the middle of the lever body, and the bushing is pressed into the through hole. The bushing is sleeved outside the intermediate support shaft and is pivotally assembled with the intermediate support shaft. Both ends of the intermediate support shaft are pressed into the brake cylinder body.

[0020] According to the parking brake cylinder of one embodiment of the present invention, the bushing is a steel part.

[0021] According to the parking brake cylinder of one embodiment of the present invention, both ends of the intermediate support shaft are clamped with the brake cylinder body through a clamping spring.

[0022] According to an embodiment of the parking brake cylinder of the present invention, two first pins which are arranged away from each other are pressed onto the first end of the lever body, two first bearings are respectively installed outside the two first pins, and the lever body is located between the two first bearings.

[0023] According to an embodiment of the parking brake cylinder of the present invention, the second end of the lever body includes two brackets arranged opposite to each other, the second bearing is arranged between the two brackets, and the two ends of the second pin shaft are respectively pressed into the two brackets.

[0024] The parking brake cylinder according to an embodiment of the present invention, wherein the lever body has a V-shaped cross section.

[0025] The parking brake cylinder according to an embodiment of the present invention, wherein both the first end and the second end of the lever body have an arc-shaped outer contour.

[0026] The parking brake cylinder according to an embodiment of the present invention, wherein a sealing plate for encapsulating the parking cylinder is provided on one side of the brake cylinder cover facing the parking cylinder. The edge of the sealing plate has a flanging for connecting with the parking cylinder body. The parking cover plate presses against the sealing plate, and the sealing plate has an avoidance hole for avoiding the parking transmission rod assembly and the parking amplification mechanism.

[0027] The parking brake cylinder according to an embodiment of the present invention, wherein the parking transmission rod assembly includes a parking screw assembly and a transmission sleeve. The transmission sleeve is fixedly connected to the parking amplification mechanism. The transmission sleeve is sleeved outside the parking screw assembly and is connected by a trapezoidal thread. The parking screw assembly is connected to the parking piston through a bearing.

[0028] The parking brake cylinder according to an embodiment of the present invention, wherein the parking amplification mechanism has a connecting column with an external thread, and a section of the inner peripheral wall of the transmission sleeve has an internal thread for connecting with the connecting column.

[0029] The parking brake cylinder according to an embodiment of the present invention further includes: a ratchet and a ratchet bearing. The ratchet is installed on the parking cover plate through the ratchet bearing, and the ratchet is connected to the parking screw assembly; a manual release device and a locking hook. The manual release device is connected to the ratchet through the locking hook to selectively lock the ratchet.

[0030] The parking brake cylinder according to an embodiment of the present invention, wherein the thrust sleeve assembly is sleeved outside the adjusting shaft of the adjusting shaft assembly and is connected to the adjusting shaft by a trapezoidal thread.

[0031] The parking brake cylinder according to an embodiment of the present invention, wherein the brake cylinder assembly further includes: a bellows sleeved between the brake cylinder cover and the adjusting shaft, and the thrust sleeve assembly is fixedly connected to a section of the bellows.

[0032] The parking brake cylinder according to an embodiment of the present invention, wherein the brake cylinder cover is provided with a vent plug connected to the brake chamber.

[0033] The parking brake cylinder according to an embodiment of the present invention, wherein a release spring and a clearance adjusting mechanism are encapsulated in the thrust sleeve assembly.

[0034] The present invention also provides a rail vehicle having the parking brake cylinder as described in any one of the above.

[0035] The rail vehicle has the same advantages as the above-mentioned parking brake cylinder compared with the prior art, which will not be elaborated here.

[0036] The additional aspects and advantages of the present invention will be partly given in the following description, partly become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0038] Figure 1 and Figure 2 is a schematic structural diagram of a parking brake cylinder according to an embodiment of the present invention;

[0039] Figure 3 is a schematic structural diagram of a brake cylinder assembly according to an embodiment of the present invention;

[0040] Figures 4 - 6 is a schematic structural diagram of a parking cylinder assembly according to an embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of a lever assembly according to an embodiment of the present invention;

[0042] Figure 8 is a schematic structural diagram of a thrust support assembly according to an embodiment of the present invention.

[0043] REFERENCE NUMERALS:

[0044] Parking brake cylinder 100, brake cylinder assembly 110, parking cylinder assembly 120,

[0045] Brake cylinder body 1, brake cylinder cover 2, sealing plate 21,

[0046] Brake piston 3, bellows 4, adjusting shaft assembly 5, thrust sleeve assembly 6,

[0047] Thrust support assembly 7, connecting ring 71, connecting ring shaft 72, support bearing 73, positioning slot 74, positioning pin 75,

[0048] Parking amplification mechanism 8, limit slot 81, driving section 82, connecting column 83,

[0049] Parking elastic member 9, parking screw assembly 10, parking piston 11, parking cylinder body 12, ventilation plug 13,

[0050] Lever assembly 14, lever body 141, bushing 142, second bearing 143, first bearing 144, first pin shaft 145, intermediate support shaft 146, second pin shaft 147, circlip 148,

[0051] Parking cover plate 15, transmission sleeve 16,

[0052] Ratchet 17, ratchet bearing 18, locking hook 19, manual release device 20. Detailed implementation manner

[0053] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0056] The following refers to Figures 1 - 8 Describe the parking brake cylinder 100 according to the embodiment of the present invention.

[0057] As Figures 1 - 2As shown, the parking brake cylinder 100 according to an embodiment of the present invention includes a brake cylinder assembly 110 and a parking cylinder assembly 120. The brake cylinder assembly 110 is used to output braking force during driving. The parking cylinder assembly 120 outputs a parking force through the adjusting shaft assembly 5 of the brake cylinder assembly 110 when parking is required. That is to say, the brake cylinder assembly 110 and the parking cylinder assembly 120 are not only integrated in terms of external structure, but also include internal power coupling. The structures of the brake cylinder assembly 110 and the parking cylinder assembly 120 will be described in detail below.

[0058] As Figure 1 and Figure 3 shown, the brake cylinder assembly 110 includes a brake cylinder body 1, a brake cylinder head 2, and an adjusting shaft assembly 5. The brake cylinder body 1 is connected to the brake cylinder head 2 to define a brake chamber. A brake piston 3, a thrust sleeve assembly 6, a lever assembly 14, and a thrust support assembly 7 are provided in the brake chamber.

[0059] The brake piston 3 is in contact with the brake cylinder head 2. When the brake chamber is inflated, the brake piston 3 can move axially ( Figure 1 and Figure 3 move to the left in the figure), and sealing rings are installed on both the inner and outer circles of the brake piston 3 to ensure that the gas filled in the brake chamber is sealed and does not leak.

[0060] As Figure 1 and Figure 3 shown, the first end of the lever assembly 14 presses against the brake piston 3, and the second end of the lever assembly 14 presses against the thrust sleeve assembly 6. The lever assembly 14 is used to amplify the driving force of the brake piston 3.

[0061] The thrust sleeve assembly 6 is sleeved in the brake cylinder head 2 so that it can move axially. The thrust sleeve assembly 6 is power-coupled to the adjusting shaft assembly 5. The thrust sleeve assembly 6 is sleeved outside the adjusting shaft of the adjusting shaft assembly 5, and the thrust sleeve assembly 6 is connected to the adjusting shaft of the adjusting shaft assembly 5 through a trapezoidal thread. When the thrust sleeve assembly 6 moves axially, it can drive the adjusting shaft to rotate, thereby outputting braking force.

[0062] One end of the thrust sleeve assembly 6 is connected to the second end of the lever assembly 14, and it can move axially to the right through the force generated by the rotation of the lever assembly 14. A gap adjusting mechanism is encapsulated in the thrust sleeve assembly 6 and cooperates with the adjusting shaft assembly 5 to complete the gap adjusting function; a return spring is encapsulated in the thrust sleeve assembly 6. After the gas in the brake chamber is exhausted, the return spring generates a return force to push the thrust sleeve assembly 6 to move to the left, driving the lever assembly 14 to rotate and resetting the brake piston 3 (to the right).

[0063] As Figure 1 and Figure 3As shown, the brake cylinder assembly 110 further includes: a bellows 4 sleeved between the brake cylinder head 2 and the adjusting shaft. The bellows 4 is sleeved outside the adjusting shaft. One end of the bellows 4 is fixedly connected to the thrust sleeve assembly 6. The bellows 4 can prevent dust and other sundries from entering the interior of the brake cylinder assembly 110.

[0064] As Figure 1 and Figure 3 shown, the brake cylinder head 2 may further be provided with a vent plug 13 connected to the brake chamber. The vent plug 13 can discharge the air and moisture in the brake chamber.

[0065] The thrust support assembly 7 is connected to the thrust sleeve assembly 6. The thrust support assembly 7 and the thrust sleeve assembly 6 can move axially together. For example, the thrust support assembly 7 and the thrust sleeve assembly 6 can be connected by a threaded connection structure.

[0066] As Figure 1 and Figure 4 shown, the parking cylinder assembly 120 includes a parking cylinder body 12, a parking cover plate 15, and a parking amplification mechanism 8. The parking cylinder body 12 is connected to the parking cover plate 15 to define a parking chamber. A parking piston 11, a parking elastic member 9, and a parking transmission rod assembly are provided in the parking chamber.

[0067] The parking piston 11 is in contact with the parking cylinder body 12. When the parking chamber is inflated, the parking piston 11 can move axially ( Figure 1 and Figure 3 upward movement in [the figure]). And a sealing ring is installed on the outer circumference of the parking piston 11 to ensure that the gas filled in the parking chamber is sealed and does not leak.

[0068] The parking elastic member 9 is elastically connected between the parking piston 11 and the parking cover plate 15. After the air in the parking chamber is exhausted, the parking elastic member 9 generates a restoring force to push the parking piston 11 downward to reset the parking piston 11. The parking elastic member 9 applies a parking braking force after the air in the parking chamber is exhausted.

[0069] The parking amplification mechanism 8 is connected to the parking piston 11 through the parking transmission rod assembly. The parking piston 11 can push the parking amplification mechanism 8 to reciprocate under the interaction of compressed air and the parking elastic member 9.

[0070] The parking amplification mechanism 8 is connected to the thrust support assembly 7. The parking amplification mechanism 8 is used to amplify the parking force and output it to the thrust support assembly 7. The thrust support assembly 7 is connected to the thrust sleeve assembly 6. The thrust support assembly 7 and the thrust sleeve assembly 6 can move axially together. For example, the thrust support assembly 7 and the thrust sleeve assembly 6 can be connected by a threaded connection structure.

[0071] In other words, through the thrust support assembly 7, the coupling of the internal force transmission path between the parking cylinder assembly 120 and the brake cylinder assembly 110 is realized. The parking brake cylinder 100 can output the braking force for braking and the parking force for parking through the adjusting shaft assembly 5. Moreover, both the brake cylinder assembly 110 and the parking cylinder assembly 120 have the function of internal force amplification, so that a greater braking force or parking force can be output.

[0072] As Figure 1 and Figure 2 shown, the parking cylinder body 12 is connected to the brake cylinder head 2 to realize the integration of the external structures of the brake cylinder assembly 110 and the parking cylinder assembly 120, which is convenient for overall sealing and assembly.

[0073] For example, as Figure 1 and Figure 3 shown, on the side of the brake cylinder head 2 facing the parking cylinder, there is a sealing plate 21 for encapsulating the parking cylinder. The edge of the sealing plate 21 has a flanging for connecting with the parking cylinder body 12. The peripheral wall of the parking cylinder body 12 is provided with a supporting flange. The flanging presses against the supporting flange, and the parking cover plate 15 presses against the sealing plate 21. The sealing plate 21 has an avoidance hole for avoiding the parking transmission rod assembly and the parking amplification mechanism 8.

[0074] Next, the structure of the lever assembly 14 of the embodiment of the present invention will be described in detail with reference to the accompanying drawings. As Figure 3 and Figure 7 shown, the lever assembly 14 includes: a lever main body 141, a first pin shaft 145, a first bearing 144, a second pin shaft 147, a bushing 142, and a second bearing 143.

[0075] Figure 7 shown, the middle part of the lever main body 141 is pivotally installed on the brake cylinder body 1 through an intermediate pivot shaft 146. A through hole is provided in the middle part of the lever main body 141. A bushing 142 is press-fitted in the through hole. The bushing 142 is in interference fit with the through hole. The bushing 142 is sleeved outside the intermediate pivot shaft 146 and is pivotally assembled with the intermediate pivot shaft 146. The bushing 142 and the intermediate pivot shaft 146 are in clearance fit. The bushing 142 can be a steel part, so that the middle part of the lever main body 141 is firmly supported and not easily broken. The two ends of the intermediate pivot shaft 146 are press-fitted into the brake cylinder body 1. The two ends of the intermediate pivot shaft 146 are clamped with the brake cylinder body 1 through a circlip 148 (shaft retaining ring). For example, the brake cylinder body 1 has a support seat protruding into the brake cavity. The two ends of the intermediate pivot shaft 146 are supported on the support seat, and axial positioning is achieved through the circlip 148. The two ends of the intermediate pivot shaft 146 are clamped by the circlip 148, which can prevent the lever assembly 14 from moving axially inside the cylinder body.

[0076] Figure 7As shown, a first bearing 144 is installed at the first end of the lever body 141 through a first pin shaft 145, and the first bearing 144 presses against the brake piston 3. Two first pin shafts 145 arranged away from each other are press-fitted at the first end of the lever body 141. For example, one first pin shaft 145 is press-fitted on one side wall of the first end of the lever body 141, and the other first pin shaft 145 is press-fitted on the other side wall of the first end of the lever body 141. Two first bearings 144 are respectively installed outside the two first pin shafts 145, and the lever body 141 is located between the two first bearings 144. In other words, two first bearings 144 are installed on the outer side of the first end of the lever assembly 14, and the outer ring of the brake piston 3 can be used to press against the first bearings 144, which is easy to cooperate with the brake piston 3 and facilitates the forming and assembly of the brake piston 3.

[0077] Figure 7 As shown, a second bearing 143 is installed at the second end of the lever body 141 through a second pin shaft 147, and the second bearing 143 presses against the thrust sleeve assembly 6. The second end of the lever body 141 includes two oppositely arranged brackets, the second bearing 143 is arranged between the two brackets, and both ends of the second pin shaft 147 are press-fitted into the two brackets.

[0078] Both the first end and the second end of the lever body 141 have an arc-shaped outer contour to prevent the lever body 141 from interfering with surrounding components during rotation. The lever body 141 has a V-shaped cross-section, and the intermediate pivot shaft 146 is located at the tip.

[0079] In the lever assembly 14, the distance between the axis of the first pin shaft 145 and the axis of the intermediate pin shaft is L1, and the distance between the axis of the second pin shaft 147 and the axis of the intermediate pin shaft is L2. L1 / L2 is the magnification ratio of the lever assembly 14, and the magnification ratio of the brake cylinder assembly 110 can be adjusted by adjusting the value between L1 and L2.

[0080] Next, the transmission structural members between the brake cylinder assembly 110 and the parking cylinder assembly 120 according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0081] The axes of the brake piston 3, the thrust sleeve assembly 6, and the adjusting shaft assembly 5 coincide and are all along Figure 1 the lateral direction in Figure 1 The axes of the parking piston 11, the parking transmission rod assembly, and the parking transmission rod assembly coincide and are all along

[0082] such as Figure 8 shown, the thrust support assembly 7 includes: a connecting ring 71 and a support bearing 73.

[0083] The connecting ring 71 is connected to the thrust sleeve assembly 6. For example, the inner peripheral wall of the connecting ring 71 has internal threads for threaded connection with the thrust sleeve assembly 6. The threaded connection between the connecting ring 71 and the thrust sleeve assembly 6 is convenient for assembly. As Figure 3 , Figure 4 , Figure 8 shown, both the inner peripheral wall of the connecting ring 71 and the outer peripheral wall of the thrust sleeve assembly 6 have positioning sub-grooves 74. The positioning sub-grooves 74 are semi-cylindrical. The two positioning sub-grooves 74 form a cylindrical positioning groove. The connecting ring 71 and the thrust sleeve assembly 6 are positioned by a positioning pin 75 provided in the positioning groove, which can further prevent relative rotation between the connecting ring 71 and the thrust sleeve assembly 6.

[0084] As Figure 8 shown, the outer peripheral surface of the connecting ring 71 has a connecting ring shaft 72. The connecting ring shaft 72 is integrally formed with the connecting ring 71. For example, the connecting ring shaft 72 and the connecting ring 71 are integrally cast. A support bearing 73 is sleeved outside the connecting ring shaft 72. The support bearing 73 cooperates with the parking amplification mechanism 8. Specifically, the support bearing 73 cooperates with the driving surface of the parking amplification mechanism 8. There are two connecting ring shafts 72, and the two connecting ring shafts 72 are arranged away from each other along the circumferential direction of the connecting ring 71. There are two support bearings 73 and they correspond to the connecting ring shafts 72 one by one. Correspondingly, as Figure 5 shown, the driving surfaces of the parking amplification mechanism 8 are also two, and the two driving surfaces correspond to the two support bearings 73 one by one. In this way, the cooperation relationship between the parking amplification mechanism 8 and the thrust support assembly 7 is more stable, and the force transmission is more balanced and reliable.

[0085] As Figures 4 - 6 shown, the parking amplification mechanism 8 has a driving surface, and the driving surface faces away from the brake cylinder block 1. The angle between the tangent line of at least one place of the driving surface and the axis of the parking amplification mechanism 8 is an acute angle. By adjusting the shape and size of the driving surface, the amplification ratio of the parking amplification mechanism 8 can be changed.

[0086] As Figure 6 shown, the driving surface has a limit groove 81 and a driving section 82. The driving section 82 is connected to the end of the limit groove 81 away from the parking piston 11. The angle between the tangent line of the driving section 82 and the axis of the parking amplification mechanism 8 is smaller than the angle between the tangent line at the connection of the limit groove 81 and the driving section 82 and the axis of the parking amplification mechanism 8. When the parking cylinder is in the release state, the support bearing 73 presses against the wall surface of the limit groove 81. When the parking cylinder is working, the support bearing 73 presses against the driving section 82. The amplification ratio of the parking amplification mechanism 8 is mainly determined by the shape of the driving section 82. The driving section 82 is arc-shaped, and the center of curvature of the driving section 82 is located on the side of the driving surface away from the brake cylinder block 1. The limit groove 81 includes a plurality of sequentially connected arc segments, and the radius of curvature of the driving section 82 is greater than the radius of curvature of each segment of the limit groove 81.

[0087] As Figure 6As shown, the parking amplification mechanism 8 has a U-shaped drive rod and a connecting column 83. Each of the two branches of the U-shaped drive rod has a drive surface, and the connecting column 83 is connected to the transverse connecting rod of the U-shaped drive rod.

[0088] As Figure 4 shown, the parking transmission rod assembly includes a parking screw assembly 10 and a transmission sleeve 16. The transmission sleeve 16 is fixedly connected to the parking amplification mechanism 8. The parking amplification mechanism 8 has a connecting column 83, and the connecting column 83 has an external thread. A section of the inner peripheral wall of the transmission sleeve 16 has an internal thread for connecting with the connecting column 83.

[0089] The transmission sleeve 16 is sleeved outside the parking screw assembly 10, and the transmission sleeve 16 is connected to the parking screw assembly 10 through a trapezoidal thread to convert the rotation of the parking screw assembly 10 into the linear movement of the transmission sleeve 16, thereby driving the parking amplification mechanism 8 to move linearly up and down. The parking screw assembly 10 is connected to the parking piston 11 through a bearing, so that the parking screw assembly 10 and the parking piston 11 can rotate relative to each other.

[0090] As Figure 4 shown, the parking brake cylinder 100 may further include: a ratchet 17, a ratchet bearing 18, a manual release device 20, and a locking hook 19. The ratchet 17 is installed on the parking cover plate 15 through the ratchet bearing 18, so that the ratchet 17 can rotate relative to the parking cover plate 15. The ratchet 17 is connected to the parking screw assembly 10. The manual release device 20 can be installed on the brake cylinder head 2, and the manual release device 20 is connected to the ratchet 17 through the locking hook 19 to selectively lock the ratchet 17 to achieve the manual release function. The ratchet 17 can cooperate with the locking hook 19 to restrict the rotation of the parking screw assembly 10 to enable the parking screw assembly 10 to move with the piston. When the locking hook 19 is unlocked, the manual release of the parking cylinder assembly 120 is achieved.

[0091] The working process of the parking brake cylinder 100 according to the embodiment of the present invention is described below.

[0092] Braking of the brake cylinder assembly 110: When the gap between the brake disc and the brake pad is within the normal range and gas is filled into the brake cavity, the brake piston 3 moves to the left, pushing the first end (the first bearing 144) of the lever assembly 14. The lever assembly 14 rotates, and the second end (the second bearing 143) of the lever assembly 14 can push the thrust sleeve assembly 6 to move to the right. Since the thrust sleeve assembly 6 is connected to the adjusting shaft assembly 5 through a trapezoidal thread, the output of the braking force of the brake cylinder assembly 110 can be achieved during this process.

[0093] Release of the brake cylinder assembly 110: When the gas in the brake cavity is discharged, since a release spring is encapsulated in the thrust sleeve assembly 6, the thrust sleeve assembly 6 can move axially to the left, and the brake piston 3 is pushed to reset to the right through the lever assembly 14.

[0094] When the gap between the brake disc and the brake pad exceeds the normal range, the gap adjusting mechanism encapsulated in the thrust sleeve assembly 6 can cooperate with the adjusting shaft assembly 5 to complete the gap adjustment through reciprocating motion, so that the gap between the brake disc and the brake pad reaches the normal range.

[0095] Parking of the parking cylinder assembly 120: The gas in the parking cavity is discharged, and the parking piston 11 moves downward under the action of the parking elastic member 9. At this time, the locking hook 19 tightly holds the ratchet wheel 17 (manual release not implemented), and the ratchet wheel 17 cannot rotate. Under the action of the parking elastic member 9, the ratchet wheel 17 and the parking screw assembly 10 cannot rotate. Since the parking screw assembly 10 cannot rotate relative to the parking piston 11, the parking screw assembly 10 can only move together with the parking piston 11, and pulls the parking amplification mechanism 8 downward through the transmission sleeve 16. The downward moving parking amplification mechanism 8 uses its driving section 82 to push the thrust support assembly 7. Since the thrust support assembly 7 is equipped with a support bearing 73, the thrust support assembly 7 can move axially to the right, driving the thrust sleeve assembly 6 and the adjusting shaft assembly 5 to move to the right to achieve parking braking.

[0096] Release of the parking cylinder assembly 120: When gas is filled into the parking cavity, the parking piston 11 moves upward, and the locking hook 19 tightly holds the ratchet wheel 17 (manual release not implemented), and the ratchet wheel 17 cannot rotate. Under the action of the parking elastic member 9, the ratchet wheel 17 and the parking screw assembly 10 cannot rotate, and push the parking amplification mechanism 8 upward through the transmission sleeve 16. Since a release spring is encapsulated in the thrust sleeve assembly 6, the thrust sleeve assembly 6 can move axially to the left, and push the brake piston 3 to reset to the right through the lever assembly 14.

[0097] Implementation of manual release: When the parking cavity cannot be inflated due to a fault, pull the manual release device 20 to implement manual release. The ratchet wheel 17 is disengaged from the locking hook 19. At this time, the ratchet wheel 17 can rotate, and the parking screw assembly 10 can also rotate. Under the rotation of the parking screw assembly 10, the transmission sleeve 16 drives the parking amplification mechanism 8 to move upward. At this time, the thrust sleeve assembly 6 moves axially to the left, and pushes the brake piston 3 to reset to the right through the lever assembly 14.

[0098] The rail vehicle of this embodiment includes the parking brake cylinder 100 of any of the above embodiments. In some embodiments, the rail vehicle may include multiple carriages, including carriages with a drive system and carriages without a drive system. The carriages with a drive system usually include multiple parking brake cylinders 100 and multiple non-parking brake cylinders.

[0099] The braking system of the rail vehicle of the present invention has stable working performance. Its parking brake cylinder 100 can output braking force for braking and parking force for parking, and both the brake cylinder assembly 110 and the parking cylinder assembly 120 have the function of internal force amplification, so that a greater braking force or parking force can be output.

[0100] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0101] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A parking brake cylinder (100), characterized in that, include: A brake cylinder assembly (110), the brake cylinder assembly (110) comprising a brake cylinder body (1), a brake cylinder cover (2) connected to the brake cylinder body (1), and an adjusting shaft assembly (5); the brake cylinder body (1) and the brake cylinder cover (2) define a brake chamber, in which a brake piston (3), a thrust sleeve assembly (6), a lever assembly (14) and a thrust support assembly (7) are arranged; the thrust sleeve assembly (6) is dynamically coupled to the adjusting shaft assembly (5); a first end of the lever assembly (14) presses against the brake piston (3), and a second end presses against the thrust sleeve assembly (6); and the thrust support assembly (7) is connected to the thrust sleeve assembly (6); A parking cylinder assembly (120), the parking cylinder assembly (120) comprising a parking cylinder body (12), a parking cover plate (15) and a parking amplification mechanism (8), the parking cylinder body (12) being connected to the brake cylinder cover (2), the parking cylinder body (12) being connected to the parking cover plate (15) to define a parking chamber, the parking chamber being provided with a parking piston (11), a parking elastic member (9) and a parking transmission rod assembly, the parking elastic member (9) being elastically connected between the parking piston (11) and the parking cover plate (15), the parking transmission rod assembly being connected to the parking piston (11) and the parking amplification mechanism (8), and the parking amplification mechanism (8) being connected to the thrust support assembly (7); The thrust support assembly (7) comprises: A connecting ring (71), the connecting ring (71) is connected to the thrust sleeve assembly (6), and the outer peripheral surface of the connecting ring (71) has a connecting ring shaft (72); A support bearing (73), wherein the support bearing (73) is sleeved outside the connecting ring shaft (72) and cooperates with the parking and magnification mechanism (8); The parking amplification mechanism (8) has a driving surface, the driving surface has a limit groove (81) and a driving section (82), the driving section (82) is connected to the end of the limit groove (81) away from the parking piston (11), the angle between the tangent of the driving section (82) and the axis of the parking amplification mechanism (8) is smaller than the angle between the tangent of the connection between the limit groove (81) and the driving section (82) and the axis of the parking amplification mechanism (8), when the parking cylinder is relieved, the support bearing (73) presses against the wall of the limit groove (81), and when the parking cylinder is working, the support bearing (73) presses against the driving section (82).

2. The parking brake cylinder (100) according to claim 1, characterized in that, The axis of the parking piston (11) is perpendicular to the axis of the brake piston (3), the movement direction of the thrust support assembly (7) is perpendicular to the axis of the parking transmission rod assembly, and the axis of the parking transmission rod assembly is parallel to the axis of the parking piston (11).

3. The parking brake cylinder (100) according to claim 1, characterized in that, The inner peripheral wall of the connecting ring (71) has an internal thread for threaded connection with the thrust sleeve assembly (6).

4. The parking brake cylinder (100) according to claim 1, characterized in that, The inner peripheral wall of the connecting ring (71) and the outer peripheral wall of the thrust sleeve assembly (6) both have positioning sub-grooves (74), and the two positioning sub-grooves (74) form a positioning groove. The connecting ring (71) and the thrust sleeve assembly (6) are positioned by a positioning pin (75) provided in the positioning groove.

5. The parking brake cylinder (100) according to claim 1, characterized in that, There are two connecting ring shafts (72), and the two connecting ring shafts (72) are arranged away from each other along the circumferential direction of the connecting ring (71). There are two support bearings (73) and they correspond to the connecting ring shafts (72) one by one.

6. The parking brake cylinder (100) according to claim 1, characterized in that, The connecting ring shaft (72) and the connecting ring (71) are integrally formed.

7. The parking brake cylinder (100) according to claim 1, characterized in that, The included angle between the tangent line at at least one place of the driving surface and the axis of the parking amplification mechanism (8) is an acute angle.

8. The parking brake cylinder (100) according to claim 1, characterized in that, The driving section (82) is arc-shaped, and the center of curvature is located on the side of the driving surface away from the brake cylinder block (1).

9. The parking brake cylinder (100) according to claim 1, characterized in that, The limiting groove (81) includes a plurality of sequentially connected arc segments.

10. The parking brake cylinder (100) according to any one of claims 1-9, characterized in that, The lever assembly (14) includes: a lever main body (141). The middle part of the lever main body (141) is pivotally installed on the brake cylinder block (1) through an intermediate support shaft (146). A first bearing (144) is installed at the first end of the lever main body (141) through a first pin shaft (145). A second bearing (143) is installed at the second end of the lever main body (141) through a second pin shaft (147). The first bearing (144) presses against the brake piston (3), and the second bearing (143) presses against the thrust sleeve assembly (6).

11. The parking brake cylinder (100) according to claim 10, characterized in that, The lever assembly (14) includes: a bushing (142) and an intermediate support shaft (146). A through hole is provided in the middle part of the lever main body (141), and the bushing (142) is press-fitted in the through hole. The bushing (142) is sleeved outside the intermediate support shaft (146) and is pivotally assembled with the intermediate support shaft (146). Both ends of the intermediate support shaft (146) are press-fitted into the brake cylinder block (1).

12. The parking brake cylinder (100) according to claim 11, characterized in that, The bushing (142) is a steel part.

13. The parking brake cylinder (100) according to claim 11, characterized in that, Both ends of the intermediate support shaft (146) are clamped to the brake cylinder block (1) through snap rings (148).

14. The parking brake cylinder (100) according to claim 10, characterized in that, Two first pin shafts (145) arranged away from each other are press-fitted at the first end of the lever main body (141), and two first bearings (144) are respectively installed outside the two first pin shafts (145). The lever main body (141) is located between the two first bearings (144).

15. The parking brake cylinder (100) according to claim 10, characterized in that, The second end of the lever main body (141) includes two oppositely arranged brackets, the second bearing (143) is arranged between the two brackets, and both ends of the second pin shaft (147) are press-fitted into the two brackets respectively.

16. The parking brake cylinder (100) according to claim 10, characterized in that, The lever main body (141) has a V-shaped cross-section.

17. The parking brake cylinder (100) according to claim 10, characterized in that, Both the first end and the second end of the lever main body (141) have arc-shaped outer arcs.

18. The parking brake cylinder (100) according to any one of claims 1 to 10, characterized in that, On one side of the brake cylinder head (2) facing the parking cylinder, there is a sealing plate (21) for encapsulating the parking cylinder. The edge of the sealing plate (21) has a flanging for connecting with the parking cylinder body (12). The parking cover plate (15) presses against the sealing plate (21), and the sealing plate (21) has an avoidance hole for avoiding the parking transmission rod assembly and the parking amplification mechanism (8).

19. The parking brake cylinder (100) according to any one of claims 1-9, characterized in that, The parking transmission rod assembly includes a parking screw assembly (10) and a transmission sleeve (16). The transmission sleeve (16) is fixedly connected to the parking amplification mechanism (8). The transmission sleeve (16) is sleeved outside the parking screw assembly (10) and is connected by a trapezoidal thread. The parking screw assembly (10) is connected to the parking piston (11) through a bearing.

20. The parking brake cylinder (100) according to claim 19, characterized in that, The parking amplification mechanism (8) has a connecting column (83) with an external thread. A section of the inner peripheral wall of the transmission sleeve (16) has an internal thread for connecting with the connecting column (83).

21. The parking brake cylinder (100) according to claim 19, characterized in that, It further includes: A ratchet (17) and a ratchet bearing (18). The ratchet (17) is installed on the parking cover plate (15) through the ratchet bearing (18), and the ratchet (17) is connected to the parking screw assembly (10). A manual release device (20) and a locking hook (19). The manual release device (20) is connected to the ratchet (17) through the locking hook (19) to selectively lock the ratchet (17).

22. The parking brake cylinder (100) according to any one of claims 1-9, characterized in that, The thrust sleeve assembly (6) is sleeved outside the adjusting shaft of the adjusting shaft assembly (5) and is connected to the adjusting shaft by a trapezoidal thread.

23. The parking brake cylinder (100) according to claim 22, characterized in that, The brake cylinder assembly (110) further includes: a bellows (4). The bellows (4) is sleeved between the brake cylinder head (2) and the adjusting shaft, and the thrust sleeve assembly (6) is fixedly connected to a section of the bellows (4).

24. The parking brake cylinder (100) according to any one of claims 1-9, characterized in that, The brake cylinder head (2) is provided with a vent plug (13), and the vent plug (13) is connected to the brake chamber.

25. The parking brake cylinder (100) according to any one of claims 1-9, characterized in that, The thrust sleeve assembly (6) encapsulates a release spring and a clearance adjusting mechanism.

26. A rail vehicle, characterized in that, Having a parking brake cylinder (100) as described in any one of claims 1-25.

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