CN106763342B

CN106763342B - Vehicle parking cylinder

Info

Publication number: CN106763342B
Application number: CN201611219700.5A
Authority: CN
Inventors: 王贤龙; 曾梁彬; 霍伟
Original assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd; CRRC Changzhou Tech Mark Industrial Co Ltd
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2019-12-13
Anticipated expiration: 2036-12-26
Also published as: CN106763342A

Abstract

A vehicle parking cylinder comprises an intermediate body, a parking cylinder body, a parking piston assembly, a parking control mechanism and a hand relieving device; the parking piston assembly comprises a parking piston, a parking energy storage spring, a parking screw rod, a parking threaded sleeve, a lower spring seat and a ratchet wheel which are positioned in a parking cylinder body; parking control mechanism includes wedge and thrust cover, and thrust cover movable fit overlaps on the center tube of midbody, and the thrust cover is connected with the brake piston through the guide bolt of bisymmetry, the bottom and the brake piston subassembly of wedge are connected, and insert between thrust cover and the midbody on the upper portion of wedge, and the wedge face of wedge pastes on the trailing flank of thrust cover, is equipped with a pair of wedge reset spring between the bottom of thrust cover and the parking cylinder lid, and the output piece of device is alleviated deeply to the hand and is parked in the cylinder body and ratchet looks lock joint.

Description

Vehicle parking cylinder

Technical Field

The invention relates to a vehicle parking cylinder.

Background

The unit brake cylinder with the parking function comprises a unit brake cylinder and a parking cylinder. The utility model discloses a chinese application No. 201220312267.0's utility model discloses an energy storage formula parking unit brake jar, including unit brake jar and parking jar two parts, its parking jar part is alleviated the device including the cylinder body of parking, the piston of parking, the adjusting nut of parking, parking spring, uide pin, hand brake cover subassembly and hand that are equipped with the second air inlet. The parking cylinder and the unit brake cylinder are arranged transversely, and the space occupied in the transverse direction is large. Since the parking cylinders described above do not have a force amplification mechanism, the braking force output by a single parking cylinder is relatively small, and accordingly, it is necessary to increase the number of parking cylinders.

Disclosure of Invention

The invention aims to provide a vehicle parking cylinder with improved parking braking capacity.

In order to achieve the purpose, the invention adopts the following technical scheme: the invention comprises an intermediate body, a parking cylinder body, a parking piston assembly, a parking control mechanism and a hand relieving device; the parking cylinder body is connected to a base of the intermediate body, a parking cylinder cover is connected to the parking cylinder body, and a central tube extending downwards is arranged on the parking cylinder cover; the parking control mechanism comprises a wedge body and a thrust sleeve, the thrust sleeve is sleeved on a central pipe of the intermediate body in a movable fit manner, two symmetrical guide bolts for driving a brake piston of the unit brake cylinder to move are connected onto the thrust sleeve, the bottom of the wedge body is connected with a brake piston assembly, the upper part of the wedge body is inserted between the thrust sleeve and the intermediate body, a pair of wedge body reset springs are arranged between the bottom of the thrust sleeve and a parking cylinder cover, and an output part of the hand relieving device extends into the parking cylinder body and is buckled with the ratchet wheel; the back both sides of thrust sleeve respectively are equipped with first bearing, and the outer lane surface of first bearing is convex glide plane, the preceding both sides of midbody respectively are equipped with the second bearing, and the outer lane surface of second bearing is convex glide plane, the wedge has two pull rods, and the leading flank of two pull rods has the wedge, and two pull rods of wedge insert between thrust sleeve and the midbody, and the wedge of two pull rods pastes on the glide plane of thrust sleeve, and the trailing flank of two pull rods pastes on the glide plane of midbody.

The parking piston assembly comprises a parking piston, a parking energy storage spring, a parking screw rod, a parking threaded sleeve, a lower spring seat and a ratchet wheel, wherein the parking piston, the parking energy storage spring, the parking screw rod, the parking threaded sleeve, the lower spring seat and the ratchet wheel are arranged in a parking cylinder body, the lower spring seat is rotatably connected to the parking piston, the parking screw rod is movably connected to the lower spring seat, the parking threaded sleeve is connected to the upper portion of the parking screw rod, the parking threaded sleeve upwards extends out of the parking cylinder cover, the ratchet wheel is rotatably connected to a central pipe of.

The parking screw rod of the parking piston assembly is provided with a base plate, the lower spring seat is provided with a conical central hole, the base plate of the parking screw rod is arranged in the conical central hole of the lower spring seat, the center of the bottom of the parking piston is provided with a lower concave area, the lower spring seat is arranged in the lower concave area of the parking piston, and the bottom of the lower spring seat is connected with the lower concave area of the parking piston through a lower thrust bearing; the bottom of the wedge-shaped body is connected to the parking screw sleeve.

The base plate of the parking screw is provided with a unthreaded hole, a pin is arranged in the unthreaded hole, the hemispherical head of the pin protrudes out of the bottom surface, and the part of the lower concave area of the parking piston, which is opposite to the hemispherical head of the pin, is provided with a hemispherical groove.

The bottom surface of the ratchet wheel is connected with the parking cylinder cover through an upper thrust bearing.

The bottom of the wedge-shaped body is provided with a screw rod, and the wedge-shaped body is connected on the parking screw sleeve by the screw rod.

The left side and the right side of the thrust sleeve are respectively provided with a first bearing frame, and the first bearings are connected to the first bearing frames through pin shafts.

The middle body is provided with two symmetrical windows, a second bearing frame is arranged in each window, and the second bearing is connected to the second bearing frame through a pin shaft.

The device is alleviated to hand has the hand of connecting on the midbody and alleviates the body, the body is alleviated to the hand has the cavity, be equipped with the pull pin in the cavity, the pull pin comprises the pull pin body of rod and pull pin main part, be equipped with pull pin reset spring on the pull pin body of rod, the upper end of the pull pin body of rod is connected with the hand and alleviates the stay cord, be equipped with the breach in the pull pin main part, the upper portion of breach wall is the arc surface, the lower part of breach wall is the inclined plane, the lower extreme from the arc surface to the inclined plane on the breach wall is equipped with the axial groove who link up the cylinder face, be equipped with the rolling member in the breach, be connected with the drag hook on the rolling member, the output piece of device is alleviated for.

The inner wall of the parking cylinder body is provided with a drag hook spring seat around an opening for inserting the drag hook, a spring limiting platform is arranged at the corner of the drag hook, and a drag hook reset spring is arranged between the spring seat and the spring limiting platform.

The rolling piece comprises two bearings and a hand relieving movable block connected between the two bearings, and the draw hook is connected in a center hole of the hand relieving movable block.

The invention has the following positive effects: 1. the parking cylinder is suitable for being arranged below the unit brake cylinder, so that the unit brake cylinder with the parking cylinder, which is composed of the unit brake cylinder and the parking cylinder, is small in transverse size, the space of a unit composed of a brake clamp and the unit brake cylinder with the parking cylinder in the transverse direction can be saved, and the requirement of small transverse installation space of different bogies can be met conveniently. 2. The parking braking force is transmitted through the inclined plane of the wedge body, the vertical force is changed into the horizontal force, the force value of the horizontal force is larger than that of the vertical force, the force value is amplified, and the force amplifying mechanism is equivalent to the force amplifying mechanism, so that the parking braking force is larger than that of a parking braking cylinder without the amplifying mechanism, and the number of the parking braking cylinders used by a whole vehicle can be reduced. 3. The invention can obtain different parking braking forces only by changing the angle of the wedge-shaped body slope, thus being convenient to meet the requirements of different parking braking forces required by different vehicle types. 4. The hand relieving device realizes the amplification of force values through the inclined surface of the pull pin, reduces the input force of the hand relieving, and can conveniently reach a range value of the input force required by the hand relieving through adjusting the angle of the inclined surface and the spring force of the pull pin. 5. The installation angle of the hand relieving body is changed, so that the wire outgoing direction of the pull rope of the hand relieving device can be adjusted, and the hand relieving device is convenient to meet the requirements of different bogie installation spaces.

Drawings

FIG. 1 is a block diagram of the present invention (intermediate display).

FIG. 2 is a block diagram of a brake cylinder with a parking unit, of which the parking cylinder is an integral part.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a sectional view F-F of fig. 2.

Fig. 5 is a sectional view taken along line J-J of fig. 4.

Fig. 6 is a perspective view of the lower spring seat.

Fig. 7 is a perspective view of the ratchet.

Fig. 8 is a perspective view of a wedge.

Fig. 9 is a perspective view of the thrust sleeve.

FIG. 10 is a diagram of a parking piston assembly.

Fig. 11 is a related combination view of the thrust sleeve.

FIG. 12 is a combination view of a parking cylinder head and ratchet.

FIG. 13 is a diagram of the relevant combinations of intermediates.

Fig. 14 is a sectional view E-E of fig. 3, i.e., a structural view of the hand relief device.

FIG. 15 is a combination drawing of a pull pin and a roller.

In the drawings: the parking cylinder comprises a parking cylinder body 1, a parking threaded sleeve 2, a parking screw rod 3, a parking cylinder cover 4, a ratchet wheel 5, an upper thrust bearing 6, a parking energy storage spring 7, a parking piston 8, a lower thrust bearing 9, a lower spring seat 10, a positioning pin 11, a positioning spring 12, a wedge-shaped body return spring 13, a wedge-shaped body 14, a thrust sleeve 15, a first bearing frame 15-1, a guide bolt 16, a first bearing 17-1, a second bearing 17-2, a second bearing frame 18, a spring connecting column 19 and an intermediate body 20; the hand relieving device C comprises a hand relieving device C, a hand relieving body 21, a pull pin 22, a pull pin return spring 23, a rolling piece 24, a bottom cover 25, a hook spring seat 26, a hook 27, a hook return spring 28, a hand relieving body sheath 29, a connecting block 30, a hand relieving pull rope 31 and a rolling piece 32.

Detailed Description

Example 1

FIG. 2 is a block diagram of a brake cylinder with a parking unit, including a unit brake cylinder and a parking cylinder.

Referring to fig. 1 to 15, the parking cylinder comprises a parking cylinder block 1, a parking piston assembly, a parking control mechanism, a hand relief device and a central body 20. The intermediate body 20 is connected to the brake cylinder a1 of the unit brake cylinder.

The parking cylinder body 1 is connected to a base of the intermediate body 20, the parking cylinder body 1 is connected with a parking cylinder cover 4, and the parking cylinder cover 4 is provided with a central tube 4-1 extending downwards.

The parking piston assembly comprises a parking piston 8, a parking energy storage spring 7, a parking screw rod 3, a parking screw sleeve 2, a lower spring seat 10 and a ratchet wheel 5 which are arranged in a parking cylinder body 1. The parking screw 3 is provided with a base plate 3-1, the lower spring seat 10 is provided with a conical central hole 10-1, and the base plate 3-1 of the parking screw 3 is arranged in the conical central hole 10-1 of the lower spring seat 10, so that the parking screw 3 is movably connected on the lower spring seat 10. The center of the bottom of the parking piston 8 is provided with a lower concave area 8-1, a lower spring seat 10 is arranged in the lower concave area 8-1 of the parking piston, and the bottom of the lower spring seat 10 is connected with the lower concave area 8-1 of the parking piston through a lower thrust bearing 9, so that the lower spring seat 10 is axially limited and is rotatably connected to the parking piston 8. The base plate 3-1 of the parking screw is provided with a unthreaded hole, a positioning spring 12 and a pin 11 are arranged in the unthreaded hole, the positioning spring 12 is used for positioning the pin 11, the hemispherical head 11-1 of the pin 11 protrudes out of the bottom surface, and the part of the lower concave area 8-1 of the parking piston, which is opposite to the hemispherical head 11-1 of the pin, is provided with a hemispherical groove 8-2. When the pin 11 is in contact with the parking piston and rotates, the hemispherical head 11-1 thereof rotates in the hemispherical groove 8-2, so that the rotation resistance can be reduced. The parking screw sleeve 2 is connected to the upper portion of the parking screw rod 3, and the parking screw sleeve 2 extends upwards to park the cylinder cover 4. The ratchet wheel 5 is connected to a central tube 4-1 of the parking cylinder cover 4. The top surface of the ratchet wheel 5 is connected with the parking cylinder cover 4 through an upper thrust bearing 6, and the ratchet wheel 5 is axially limited and can rotate. The parking energy storage spring 7 is connected between the ratchet wheel 5 and the lower spring seat 10.

The park control mechanism includes a wedge 14 and a thrust sleeve 15. In addition, the middle body 20 is provided with a pair of guide bolt holes which are respectively arranged at the upper side and the lower side, two windows are respectively arranged at the left side and the right side of the middle body 20, a second bearing frame 18 is arranged in each window, a second bearing 17-2 is connected to each second bearing frame 18 through a pin shaft, the second bearing 17-2 protrudes out of the front side surface of the middle body 20, and the outer ring surface of the second bearing 17-2 is a sliding surface. The thrust sleeve 15 is provided with a pair of connecting lugs 15-2, the left side and the right side of the thrust sleeve are respectively provided with a first bearing frame 15-1, the first bearing frame 15-1 is connected with a first bearing 17-1 through a pin shaft, the first bearing 17-1 protrudes out of the rear side surface of the thrust sleeve 15, and the surface of the outer ring of the first bearing 17-1 is a sliding surface. The thrust sleeve 15 is sleeved on the central tube 20-1 of the intermediate body in a movable fit mode, the thrust sleeve 15 is connected with two guide bolts 16 through pin shaft holes in the two connecting lugs 15-2, and the two guide bolts 16 are respectively connected with the brake piston A2 of the unit brake cylinder through guide bolt holes in the intermediate body 20 in a clearance fit mode.

The wedge-shaped body 14 is provided with two pull rods 14-2, the bottom 14-1 of the wedge-shaped body 14 is provided with a screw 14-1, and the front side surfaces of the two pull rods 14-2 are provided with wedge surfaces 14-2 a. The wedge 14 is connected to the parking thread insert 2 by means of a screw 14-1. Two pull rods 14-2 of the wedge-shaped body 14 are inserted between the thrust sleeve 15 and the intermediate body 20, wedge-shaped surfaces 14-2a of the two pull rods 14-2 are respectively attached to two sliding surfaces of the thrust sleeve 15, and rear side surfaces of the two pull rods 14-2 are respectively attached to two sliding surfaces of the intermediate body 20. A pair of wedge reset springs 13 is arranged between the bottom of the wedge 14 and the parking cylinder cover 4, one end of each wedge reset spring 13 is inserted into a blind hole in the bottom of the wedge 14, and the other end of each wedge reset spring is sleeved on a spring column 19 of the parking cylinder cover 4. When the wedge body 14 moves downwards, the thrust sleeve 15 is pushed by the inclined surface to move horizontally, the force in the vertical direction is changed into the force in the horizontal direction, and the force value of the force in the horizontal direction is larger than that of the force in the vertical direction, so that the force amplifying mechanism is equivalent to the force amplifying mechanism, and the parking braking force is increased. The arrangement of the sliding surface reduces the pushing resistance.

The hand relieving device C is provided with a hand relieving body 21 connected to the intermediate body 20, the hand relieving body 21 is provided with a cavity with an opening at the bottom, the top is provided with a rope hole, and the upper end of the hand relieving body 21 is connected with a hand relieving body sheath 29. The pull pin 22 is arranged in a cavity of the hand release body 21, the pull pin 22 consists of a pull pin rod body 22-1 and a pull pin main body 22-2, a pull pin return spring 23 is arranged on the pull pin rod body 22-1, the upper end of the pull pin return spring 23 is abutted to the top wall of the hand release body 21 or is abutted to a sealing ring arranged at a rope hole opening, a notch 22-2s is arranged on the pull pin main body 22-2, the upper part of the notch wall is an arc surface 22-2a, the lower part of the notch wall is an inclined surface 22-2b, and an axial groove 22-2c penetrating through a cylindrical surface is arranged from the arc surface 22-2a to the lower end of the inclined surface 22-2b on the notch wall. The gap 22-2s is internally provided with a rolling element 32, the rolling element 32 comprises two bearings 32-1 and a hand release movable block 32-2 connected between the two bearings 32-1 through a pin shaft, and the arc surface 22-2a of the gap wall is matched with the bearings of the rolling element 32. An angular draw hook 27 is connected in a central hole of the hand relieving movable block 32-2, the draw hook 27 is an output part of the hand relieving device C, the draw hook 27 extends into the parking cylinder body 1 through an axial groove 22-2C of the draw pin and an opening of the parking cylinder body 1 and is buckled with the ratchet wheel 5 through a window of the parking cylinder cover 4, a draw hook spring seat 26 is arranged on the inner wall of the parking cylinder body 1 around the opening for inserting the draw hook, a spring limiting table 27-1 is arranged at a corner of the draw hook 27, and a draw hook reset spring 28 arranged between the spring seat 26 and the spring limiting table 27-1 is arranged on the draw hook 27. The cavity bottom of the pull pin 22 is provided with a gland 25. The pull pin rod body 22-1 is connected with a connecting block 30 in a rope hole, two opening screws are fixed on the connecting block 30, each opening screw is connected with a hand release pull rope 31, and the hand release pull rope 31 extends out of a top hole of the hand release body sheath 29. When the pull pin 22 moves upwards, the pull hook 27 is pulled outwards by the inclined surface 22-2b of the pull pin 22, so that the pull hook 27 is separated from the ratchet wheel 5, the hand release pull rope 31 is loosened, and the pull pin 22 is reset under the action of the pull pin reset spring 23.

When the train is braked in the parking state, air in the parking cylinder 1 is exhausted, and the parking piston 8 moves downwards under the action of the parking energy storage spring 7. At this time, the draw hook 27 tightly buckles the ratchet wheel (hand release is not implemented), so that the ratchet wheel 5 cannot rotate, the parking energy storage spring 7 and the lower spring seat 10 cannot rotate under the constraint of the ratchet wheel 5, the lower spring seat 10 is in contact with the base plate 3-1 of the parking screw 3 through the conical surface, the parking screw 3 cannot rotate, therefore, no axial displacement is generated between the parking screw 3 and the parking screw sleeve 2, and the wedge 14 moves downwards along with the parking piston 8. The wedge 14 moving downward pushes the thrust sleeve 15 forward by its inclined surface, and at the same time, the piston assembly of the unit brake cylinder is pulled out entirely by the guide bolt 16, thereby actuating the lever to perform the parking brake.

In the parking braking state, compressed air is filled into the parking cylinder 1, and the parking piston 8 compresses the parking energy storage spring 7 to move upwards. The wedge 14 also moves upwards along with it and a complete return of the wedge 14 is achieved under the action of the wedge return spring 13. Due to the upward movement of the wedge, under the action of the brake release spring A3, the unit brake piston assembly pulls the thrust sleeve 15 to reset, so that the inflation release of the parking brake is realized.

In the parking brake state, the hand release pull rope 31 is pulled, the pull pin 22 drives the pull hook 27 to separate from the ratchet wheel 5, and therefore the restraint on the rotation freedom degree of the ratchet wheel and the parking screw rod is removed. Under the effect of wedge reset spring 13, the parking screw rod rotates, and wedge 14 drives parking swivel nut 2 upward movement, and simultaneously, under the effect of unit braking release spring A3, unit braking piston assembly pulling thrust sleeve 15 resets to realize parking braking's manual release.

After the manual relieving operation, if the parking function is used, air is filled into the parking cylinder, and the parking piston compresses the parking energy storage spring 7 to move upwards through the lower thrust bearing 9 and the lower spring seat 10. At the moment, the parking screw sleeve 2 is fixedly connected with the wedge 14, the parking screw rod 3 moves upwards, the parking screw sleeve 2 provides a downward acting force for the parking screw rod 3 to enable the parking screw rod 3 to be separated from a contact surface of the lower spring seat 10, the parking screw rod 3 is in contact with the hemispherical groove 8-2 of the parking piston through the positioning pin 11, the parking piston transmits the force to the parking screw rod 3, the parking screw rod 3 rotates upwards, and the parking screw rod and the parking screw sleeve are screwed to reset.

Claims

1. A vehicle parking cylinder comprises a middle body (20), a parking cylinder body (1), a parking piston assembly, a parking control mechanism and a hand relieving device; the method is characterized in that: the parking cylinder body (1) is connected to a base of the intermediate body (20), a parking cylinder cover (4) is connected to the parking cylinder body (1), and the parking cylinder cover (4) is provided with a central tube (4-1) extending downwards; the parking control mechanism comprises a wedge body (14) and a thrust sleeve (15), the thrust sleeve (15) is sleeved on a central tube (20-1) of the intermediate body in a movable fit manner, two symmetrical guide bolts (16) for driving a brake piston (A2) of the unit brake cylinder to move are connected to the thrust sleeve (15), the bottom of the wedge body (14) is connected with a brake piston assembly, the upper part of the wedge body (14) is inserted between the thrust sleeve (15) and the intermediate body (20), a pair of wedge body return springs (13) are arranged between the bottom of the thrust sleeve (15) and the parking cylinder cover (4), and an output part of the hand relieving device extends into the parking cylinder body (1) to be buckled with the ratchet wheel (5); the two sides of the rear surface of the thrust sleeve (15) are respectively provided with a first bearing (17-1), the outer ring surface of the first bearing (17-1) is an arc-shaped sliding surface, the two sides of the front surface of the intermediate body (20) are respectively provided with a second bearing (17-2), the outer ring surface of the second bearing (17-2) is an arc-shaped sliding surface, the wedge body (14) is provided with two pull rods (14-2), the front side surfaces of the two pull rods (14-2) are provided with wedge surfaces (14-2 a), the two pull rods (14-2) of the wedge body (14) are inserted between the thrust sleeve (15) and the intermediate body (20), the wedge surfaces (14-2 a) of the two pull rods (14-2) are attached to the sliding surface of the thrust sleeve (15), and the rear side surfaces of the two pull rods (14-2) are attached to the sliding surface of the intermediate body (20).

2. The vehicle parking cylinder of claim 1, wherein: park piston assembly including being in parking piston (8), parking energy storage spring (7), parking screw rod (3), parking swivel nut (2), lower spring holder (10) and ratchet (5) in parking cylinder body (1), lower spring holder (10) rotate to be connected park on piston (8), park screw rod (3) and move and connect under on spring holder (10), park swivel nut (2) and connect on the upper portion of parking screw rod (3), park swivel nut (2) and upwards stretch out and park cylinder cap (4), ratchet (5) rotate to be connected on central tube (4-1) of parking cylinder cap (4), park energy storage spring (7) and connect between ratchet (5) and lower spring holder (10).

3. The vehicle parking cylinder of claim 2, wherein: the parking screw (3) of the parking piston assembly is provided with a base plate (3-1), the lower spring seat (10) is provided with a conical central hole (10-1), the base plate (3-1) of the parking screw (3) is arranged in the conical central hole (10-1) of the lower spring seat (10), the center of the bottom of the parking piston (8) is provided with a downward concave area (8-1), the lower spring seat (10) is arranged in the downward concave area (8-1) of the parking piston, and the bottom of the lower spring seat (10) is connected with the downward concave area (8-1) of the parking piston through a lower thrust bearing (9); the bottom of the wedge-shaped body (14) is connected to the parking thread sleeve (2).

4. The vehicle parking cylinder of claim 3, wherein: a unthreaded hole is formed in a base plate (3-1) of the parking screw, a pin (11) is arranged in the unthreaded hole, a hemispherical head (11-1) of the pin (11) protrudes out of the bottom surface, and a hemispherical groove (8-2) is formed in a position, opposite to the hemispherical head (11-1) of the pin, of the lower concave area (8-1) of the parking piston.

5. The vehicle parking cylinder of claim 2, wherein: the bottom surface of the ratchet wheel (5) is connected with the parking cylinder cover (4) through an upper thrust bearing (6).

6. The vehicle parking cylinder of claim 1, wherein: the bottom of the wedge-shaped body (14) is provided with a screw rod (14-1), and the wedge-shaped body (14) is connected to the parking threaded sleeve (2) through the screw rod (14-1).

7. The vehicle parking cylinder of claim 6, wherein: the left side and the right side of the thrust sleeve (15) are respectively provided with a first bearing frame (15-1), and the first bearing (17-1) is connected to the first bearing frame (15-1) through a pin shaft (17-3).

8. The vehicle parking cylinder of claim 6, wherein: the middle body (20) is provided with two symmetrical windows, a second bearing frame (18) is arranged in each window, and the second bearings (17-2) are connected to the second bearing frames (18) through pin shafts.

9. The vehicle parking cylinder of claim 1, wherein: the hand relieving device is provided with a hand relieving body (21) connected to the intermediate body (20), the hand relieving body (21) is provided with a cavity, a pull pin (22) is arranged in the cavity, the pull pin (22) consists of a pull pin rod body (22-1) and a pull pin main body (22-2), a pull pin reset spring (23) is arranged on the pull pin rod body (22-1), the upper end of the pull pin rod body is connected with a hand relieving pull rope (31), a notch (22-2 s) is arranged on the pull pin main body (22-2), the upper part of the notch wall is an arc surface (22-2 a), the lower part of the notch wall is an inclined surface (22-2 b), a through axial groove (22-2 c) is arranged from the arc surface (22-2 a) to the lower end of the inclined surface (22-2 b) on the notch wall, and a rolling piece (32) is arranged in the notch (22-2, the rolling piece (32) is connected with a draw hook (27), the draw hook (27) is an output piece of the hand relieving device, the draw hook (27) extends into the parking cylinder body (1) through an axial groove (22-2 c) of the pull pin, and a draw hook reset spring (28) is arranged on the draw hook (27).

10. The vehicle parking cylinder of claim 9, wherein: a draw hook spring seat (26) is arranged on the inner wall of the parking cylinder body (1) around an opening for inserting the draw hook, a spring limiting table (27-1) is arranged at the corner of the draw hook (27), and a draw hook reset spring (28) is arranged between the spring seat (26) and the spring limiting table (27-1).

11. The vehicle parking cylinder of claim 9, wherein: the rolling piece (32) consists of two bearings (32-1) and a hand relieving movable block (32-2) connected between the two bearings (32-1), and the draw hook (27) is connected in a central hole of the hand relieving movable block (32-2).