CN108944991B - Low pressure parking cylinder that alleviates - Google Patents
Low pressure parking cylinder that alleviates Download PDFInfo
- Publication number
- CN108944991B CN108944991B CN201810926801.9A CN201810926801A CN108944991B CN 108944991 B CN108944991 B CN 108944991B CN 201810926801 A CN201810926801 A CN 201810926801A CN 108944991 B CN108944991 B CN 108944991B
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- piston
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- assembly
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- 238000004146 energy storage Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
- B61H11/00—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types
- B61H11/06—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types of hydrostatic, hydrodynamic, or aerodynamic brakes
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
- Actuator (AREA)
Abstract
The invention discloses a low-relief pressure parking cylinder which comprises a parking cylinder assembly, a piston assembly, an energy storage spring, a screw rod assembly, a parking cylinder seat assembly and a pawl assembly, wherein the piston assembly comprises a piston and a guide cylinder, an opening at the lower end of the guide cylinder is detachably, fixedly and hermetically connected with the upper end of the piston, and the effective acting area of relief pressure air filled below the piston assembly is the cylinder diameter of the parking cylinder sealed by the piston without subtracting the inner hole area of the guide cylinder. According to the invention, the piston structure of the parking cylinder is improved, the guide cylinder and the piston are installed together, and the minimum relief pressure of the parking cylinder is lower under the same acting force of the energy storage spring.
Description
Technical Field
The invention belongs to the technical field of railway vehicle braking equipment, and particularly relates to a low-relief pressure parking cylinder.
Background
The parking brake cylinder for the rail transit is mainly used for meeting the parking brake requirement of a vehicle under a certain ramp condition. Parking braking is typically accomplished by the action of an energy storage spring within the parking cylinder. Application and alleviation of parking brakes may be achieved with compressed air: the parking brake is applied when compressed air is discharged and released when compressed air is charged. In addition, in order to be able to alleviate the unexpected application of parking brake force caused by an abnormality of the parking cylinder, or when there is no compressed air but there is a need to alleviate the parking brake, the parking brake cylinder needs to have a manual alleviating mechanism.
The relieving air pressure of the parking cylinder is usually derived from the total air cylinder of the locomotive, and excessive relieving pressure (such as more than 600 kPa) can cause the parking cylinder to malfunction: such as subway vehicles, passengers with full load get off, and the air quantity of the air springs is large, which may cause low air pressure filled in the parking cylinders to cause parking braking. It is generally desirable that the parking brake cylinder relief pressure be lower.
The guide sleeve in the existing parking brake cylinder is welded on the parking cylinder body, so that when the minimum relieving pressure is calculated, the effective area of the existing parking brake piston needs to be subtracted by the circular area with the diameter A of the guide sleeve, the relieving pressure is relatively high, for example, the cylinder diameter of the parking cylinder is 178mm, the acting force F=11 KN of the energy storage spring is completely relieved, the diameter A=74 mm of the guide sleeve, and then the minimum relieving pressure of the existing parking cylinder is 534kPa.
Disclosure of Invention
The invention aims at: in order to solve the problems, the low relief pressure parking cylinder capable of effectively reducing the relief pressure of the parking cylinder is provided.
The technical scheme of the invention is realized as follows: the utility model provides a low pressure of alleviating parks jar, is including parking jar group spare, piston group spare, energy storage spring, screw rod group spare, park jar seat group spare and pawl group spare, its characterized in that: the piston assembly comprises a piston and a guide cylinder, the opening part at the lower end of the guide cylinder is detachably, fixedly and hermetically connected with the upper end of the piston, and the effective acting area of the pressure relieving air filled below the piston assembly is the cylinder diameter of the parking cylinder sealed by the piston without subtracting the area of an inner hole of the guide cylinder.
According to the low-relief pressure parking cylinder, the guide cylinder is in threaded connection with the piston and is matched with the sealing ring for sealing, a drilling hole is matched between the guide cylinder and the piston, and after the screw rod assembly is assembled in the piston assembly, an elastic cylindrical pin is driven into the drilling hole for connection and fixation.
The low relief pressure parking cylinder is provided with a guide belt and a U-shaped sealing ring respectively in an outer circular groove of the piston.
The invention discloses a low-relief pressure parking cylinder, which is characterized in that an anti-rotation key is arranged at the upper part of an inner hole of a piston, the anti-rotation key is connected with the piston through interference fit, an upper thrust bearing, a nut, a lower thrust bearing, a bearing seat and a supporting retainer ring assembly are sequentially and fixedly arranged in the piston, the screw comprises a screw and a screw disc, a screw key groove matched with the anti-rotation key is axially arranged on the screw, the pawl comprises a ratchet wheel and a pawl, a nut key groove is arranged on the outer circumference of the nut, and a convex key correspondingly matched with the nut key groove is arranged in the inner hole of the ratchet wheel.
The low relief pressure parking cylinder comprises a supporting sleeve and a hole check ring, wherein the upper end of the supporting sleeve is supported at the lower end of a bearing seat through a buffer cushion, and the lower end of the supporting sleeve is supported on the hole check ring fixed in a piston.
The screw rod of the low relief pressure parking cylinder is in threaded connection with the screw rod disc, an annular groove is formed in the periphery of the screw rod disc, a guide ring is arranged in the annular groove, the guide ring is in an open circular ring shape, and the inner diameter of the guide ring is larger than the outer diameter of the annular groove of the screw rod disc.
The invention relates to a low relief pressure parking cylinder, which is characterized in that a screw rod gear threaded hole is formed in the lower end part of a screw rod, and a screw rod gear is assembled in the screw rod gear threaded hole.
The internal thread of the nut of the low relief pressure parking cylinder is a non-self-locking thread, and the nut is meshed with the non-self-locking thread of the external thread of the screw.
According to the invention, the piston structure of the parking cylinder is improved, the guide cylinder and the piston are installed together, and the minimum relief pressure of the parking cylinder is lower under the same acting force of the energy storage spring.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the piston assembly of the present invention.
Fig. 3 is a schematic view of the structure of the nut of the present invention.
FIG. 4 is a schematic view of the ratchet wheel of the present invention.
Fig. 5 and 6 are schematic views of the structure of the screw assembly of the present invention.
FIG. 7 is a schematic view of the structure of the present invention in the inflation mitigation position.
Fig. 8 is a schematic view of the present invention in a braking position.
The marks in the figure: 1 is a parking cylinder assembly, 2 is a piston assembly, 3 is an energy storage spring, 4 is a screw rod assembly, 5 is a parking cylinder seat assembly, 6 is a pawl assembly, 7 is a screw rod gear, 21 is a hole retainer ring, 22 is a bearing seat, 23 is a nut, 23a is a nut key slot, 24 is a sealing ring, 25 is a guide cylinder, 26 is an anti-rotation key, 27 is an elastic cylindrical pin, 28 is an upper thrust bearing, 29 is a lower thrust bearing, 30 is a cushion pad, 31 is a supporting sleeve, 32 is a guide belt, 33 is a U-shaped sealing ring, 34 is a piston, 41 is a guide ring, 42 is a screw rod disc, 43 is an annular groove, 44 is a screw rod, 44a is a screw rod key slot, 44b is a screw rod gear hole, 61 is a ratchet wheel, 61a is a convex key, 62 is a pawl, and 63 is a pull ring.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a low relief pressure parking cylinder comprises a parking cylinder assembly 1, a piston assembly 2, an energy storage spring 3, a screw rod assembly 4, a parking cylinder seat assembly 5 and a pawl assembly 6, wherein the piston assembly 2 comprises a piston 34 and a guide cylinder 25, an opening at the lower end of the guide cylinder 25 is detachably and fixedly connected with the upper end of the piston 34 in a sealing manner, and the effective acting area of relief pressure air filled below the piston assembly 2 is the cylinder diameter of the parking cylinder sealed by the piston 34 without subtracting the inner hole area of the guide cylinder 25. Thus, the minimum relief pressure of the parking cylinder is lower with the present invention under the same force of the storage spring.
Therefore, the main difference between the invention and the existing parking cylinder is that the guide sleeve in the existing parking brake cylinder is welded on the parking cylinder body, while the guide cylinder is arranged on the piston assembly, and when the minimum relieving pressure is calculated, the effective area of the piston of the existing parking cylinder needs to be subtracted by the circular area with the diameter A of the guide sleeve. The minimum relief pressure of the low relief pressure parking cylinder of the present invention is lower according to p=f/S at the same storage spring force F. For example, the parking cylinder diameter is 178mm, the acting force of the fully released energy storage spring is F=11kN, and A=74 mm, then the minimum release pressure of the existing parking cylinder is 534kPa, and the minimum release pressure of the low release pressure parking brake cylinder of the invention is 442kPa.
As shown in fig. 2, 3 and 4, the guide cylinder 25 is screwed with the piston 34 and is sealed by the sealing ring 24, in order to prevent the screw thread of the guide cylinder 25 from withdrawing, a drill hole is arranged between the guide cylinder 25 and the piston 34, after the screw rod assembly 4 is assembled in the piston assembly 2, an elastic cylindrical pin 27 is driven into the drill hole to be fixedly connected, and a guide belt 32 and a U-shaped sealing ring 33 are respectively arranged in an outer circular groove of the piston 34.
The anti-rotation key 26 is arranged at the upper part of an inner hole of the piston 34, the anti-rotation key 26 is connected with the piston 34 through interference fit, an upper thrust bearing 28, a nut 23, a lower thrust bearing 29, a bearing seat 22 and a supporting check ring assembly are sequentially and fixedly arranged in the piston 34, the supporting check ring assembly comprises a supporting sleeve 31 and a hole check ring 21, the upper end of the supporting sleeve 31 is supported at the lower end of the bearing seat 22 through a buffer pad 30, the lower end of the supporting sleeve 31 is supported on the hole check ring 21 fixed in the piston 34, the screw assembly 4 comprises a screw 44 and a screw disc 42, the internal thread of the nut 23 is a non-self-locking thread which is meshed with the non-self-locking thread of the external thread of the screw 44, a screw key groove 44a matched with the anti-rotation key 26 is arranged on the screw 44 along the axial direction of the screw 44, in this way, the screw 44 can only move up and down, but not rotate, the pawl assembly 6 comprises a ratchet 61 and a pawl 62, a nut key groove 23a is arranged on the outer circumference of the nut 23, the ratchet 61 is provided with a boss key groove 61a correspondingly matched with the nut 23a, thus the nut key groove 61 can rotate relatively to the ratchet 61.
As shown in fig. 5 and 6, the screw 44 is in threaded connection with the screw disc 42 and is matched with an elastic cylindrical pin to prevent the screw disc 42 from rotating and withdrawing, wherein the external screw thread is a non-self-locking screw thread, an annular groove 43 is arranged at the periphery of the screw disc 42, a guide ring 41 is arranged in the annular groove 43, the guide ring 41 is in an open circular ring shape, the inner diameter of the guide ring 41 is larger than the outer diameter of the annular groove 43 of the screw disc 42, and after the screw assembly is assembled into a piston, the guide ring supports the screw assembly, the screw can move in the radial direction to prevent the screw from being stiff and affecting the output force; a screw block screw hole 44b is provided at the lower end of the screw 44, and after the parking cylinder is assembled, a screw block 7 is assembled in the screw block screw hole 44b, and screw locking is required.
The working principle of the invention is as follows:
(1) Inflatable relief
The parking cylinder just assembled is shown in fig. 1, pressurized air is filled, the piston drives the nut to move upwards, the nut is meshed with the screw rod non-self-locking nut, the screw rod is limited by the anti-rotation key to move up and down only, and thus, the nut rotates clockwise (seen from bottom to top) to move upwards until the guide cylinder contacts the parking cylinder, and inflation relief is completed, as shown in fig. 7. In the process, the nut is connected with the ratchet key, so that the nut and the ratchet key can move up and down relatively, but cannot rotate relatively, and the ratchet is driven by the nut to rotate clockwise.
(2) Parking brake
When the pressure air below the parking piston is emptied, the parking piston moves downwards under the action of the energy storage spring, the nut drives the screw rod to move downwards, the nut has a anticlockwise (looking upwards from below) rotation trend, but the ratchet wheel connected with the nut cannot rotate anticlockwise due to the limitation of the pawl, so that the nut drives the screw rod to move downwards, and the screw rod pushes the piston (the part is not drawn) of the brake cylinder to form parking brake, as shown in fig. 8.
(3) Manual mitigation
After the parking brake cylinder is used for exhausting and braking, the pressure air can be filled again to release the parking brake cylinder, the piston drives the nut and the screw rod to move upwards under the action of the pressure air until the guide cylinder contacts the parking cylinder body, and the nut does not rotate in the process.
Manual relief may be used when the parking cylinder is not relieved by filling with pressurized air for a variety of reasons. Pulling the pull ring 63 composed of pawls releases the restriction of the pawls to the ratchet, and when the restriction of the pawls to the ratchet is released due to the tendency of the nut to rotate anticlockwise (from bottom to top) during parking braking, the nut rotates anticlockwise, and the result is represented by downward movement of the piston, upward movement of the screw under the action of the restoring spring of the brake cylinder, and manual release is completed, as shown in fig. 1.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The utility model provides a low pressure of alleviating parks jar, is including parking jar group (1), piston group (2), energy storage spring (3), screw rod group (4), park jar seat group (5) and pawl group (6), its characterized in that: the piston assembly (2) comprises a piston (34) and a guide cylinder (25), an opening part at the lower end of the guide cylinder (25) is detachably, fixedly and hermetically connected with the upper end part of the piston (34), and the effective acting area of pressure relieving air filled below the piston assembly (2) is the cylinder diameter of a parking cylinder sealed by the piston (34) without subtracting the inner hole area of the guide cylinder (25); the guide cylinder (25) is in threaded connection with the piston (34) and is matched with the sealing ring (24) for sealing, a drilling hole is matched between the guide cylinder (25) and the piston (34), and after the screw rod assembly (4) is assembled on the piston assembly (2), an elastic cylindrical pin (27) is driven into the drilling hole for connection and fixation; a guide belt (32) and a U-shaped sealing ring (33) are respectively arranged in the outer circular groove of the piston (34).
2. The low relief pressure parking cylinder of claim 1, wherein: the anti-rotation key (26) is arranged on the upper portion of an inner hole of the piston (34), the anti-rotation key (26) is connected with the piston (34) through interference fit, an upper thrust bearing (28), a nut (23), a lower thrust bearing (29), a bearing seat (22) and a supporting retainer ring assembly are sequentially and fixedly arranged in the piston (34), the screw component (4) comprises a screw (44) and a screw disc (42), a screw key groove (44 a) matched with the anti-rotation key (26) is axially arranged on the screw (44), the pawl component (6) comprises a ratchet wheel (61) and a pawl (62), a nut key groove (23 a) is arranged on the outer circumference of the nut (23), and a protruding key (61 a) corresponding to the nut key groove (23 a) is arranged in the inner hole of the ratchet wheel (61).
3. The low relief pressure parking cylinder of claim 2, wherein: the supporting check ring assembly comprises a supporting sleeve (31) and a hole check ring (21), wherein the upper end of the supporting sleeve (31) is supported at the lower end of the bearing seat (22) through a buffer pad (30), and the lower end of the supporting sleeve (31) is supported on the hole check ring (21) fixed in a piston (34).
4. The low relief pressure parking cylinder of claim 2, wherein: the screw (44) is in threaded connection with the screw disc (42), an annular groove (43) is formed in the periphery of the screw disc (42), a guide ring (41) is arranged in the annular groove (43), the guide ring (41) is in an open annular shape, and the inner diameter of the guide ring (41) is larger than the outer diameter of the annular groove (43) of the screw disc (42).
5. The low relief pressure parking cylinder of claim 4, wherein: a screw stopper screw hole (44 b) is formed in the lower end of the screw (44), and a screw stopper (7) is assembled in the screw stopper screw hole (44 b).
6. The low relief pressure parking cylinder of claim 2, wherein: the internal thread of the nut (23) is a non-self-locking thread which is meshed with the non-self-locking thread of the external thread of the screw rod (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926801.9A CN108944991B (en) | 2018-08-15 | 2018-08-15 | Low pressure parking cylinder that alleviates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926801.9A CN108944991B (en) | 2018-08-15 | 2018-08-15 | Low pressure parking cylinder that alleviates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108944991A CN108944991A (en) | 2018-12-07 |
| CN108944991B true CN108944991B (en) | 2024-07-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810926801.9A Active CN108944991B (en) | 2018-08-15 | 2018-08-15 | Low pressure parking cylinder that alleviates |
Country Status (1)
| Country | Link |
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| CN (1) | CN108944991B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109987077A (en) * | 2019-04-26 | 2019-07-09 | 四川江山轨道交通装备制造有限公司 | A kind of spring braking cylinder barrel for Parking Brake Cylinders |
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| CN208698787U (en) * | 2018-08-15 | 2019-04-05 | 眉山中车制动科技股份有限公司 | A kind of low and slow decompression force parks cylinder |
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| CN2578196Y (en) * | 2002-10-22 | 2003-10-08 | 张继达 | Locomotive for orbital traffic, vehicle parking unit braker |
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| Publication number | Publication date |
|---|---|
| CN108944991A (en) | 2018-12-07 |
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