CN216867357U - Parking inverted tread brake device - Google Patents

Abstract

The utility model relates to a parking inverted tread brake device which comprises a parking cylinder and a brake cylinder, wherein a parking cylinder body of the parking cylinder and a brake cylinder body of the brake cylinder are separated by a partition plate, and a first center hole is formed in the center of the partition plate. The brake cylinder body is internally provided with a brake piston capable of sliding in a sealing manner, the parking cylinder body is internally provided with a parking screw rod capable of moving back and forth, the end part of the parking screw rod can pass through the first center hole in a sealing manner and is abutted against the brake piston, the partition plate is horizontally arranged, the axis of the brake piston and the axis of the parking screw rod are coaxially and vertically arranged, the parking cylinder is arranged at the bottom of the brake cylinder and can face the rail surface, and the upper end of the parking screw rod can be abutted against the lower surface of the brake piston. The parking inverted tread braking device can enable the parking cylinder to face the rail surface, and does not occupy the space of a vehicle body and a framework.

Description

Parking inverted tread brake device

Technical Field

The utility model relates to the technical field of railway vehicle braking, in particular to a parking inverted tread braking device.

Background

The tread brake device is widely used for basic brake devices of high-speed locomotives and urban rail transit vehicles, has the characteristics of compact structure, wide brake multiplying power range, modularization and the like, and can realize the function of remotely and quickly manually relieving parking brake by the tread brake device with parking.

The tread brake device with parking has the function of parking brake with spring energy storage, and specifically comprises a common brake cylinder and a parking brake cylinder; the common brake cylinder has a one-way automatic clearance adjusting function, and the numerical value of each adjustment quantity can be set, so that the tread brake device can realize the normal clearance set value of the brake shoe through multiple braking and relieving operations; parking brake force is realized by mechanical spring force output. In the running process of the vehicle, the parking cylinder is filled with compressed air with a set value, namely the parking cylinder of the tread brake device is always in a release state; when a vehicle applies a braking instruction, compressed air enters a common brake cylinder, and a tread braking device triggers braking action; when the vehicle returns to the garage, in order to prevent the vehicle from sliding, the parking brake cylinder discharges compressed air, and the compressed main spring in the parking cylinder is released, so that the tread brake device generates braking action, namely the tread brake device is in a brake applying state.

As shown in figures 1 and 2, the conventional tread brake device with parking is mainly characterized in that a parking cylinder 01 and a brake cylinder 02 are both vertically placed or horizontally placed so as to meet the requirement of the installation space of a bogie of a railway vehicle. No matter the parking cylinder is arranged vertically or horizontally, the tread braking device has the characteristics of unidirectional adjustment function, adjustable braking multiplying power, modularization and the like. During installation, the brake cylinder 02 is fixedly arranged on a side beam of a bogie frame, parts such as a gear box, a motor and the like are arranged on the frame and around a tread brake device, and parts such as valves, pipelines and the like are arranged under a vehicle body. However, for a parking cylinder upright tread brake device, installation space under the vehicle body would be occupied due to the parking cylinder 01 being located above the brake cylinder 02; for parking cylinder lateral tread brakes, the frame installation space would be occupied due to the lateral placement of parking cylinder 01. Therefore, in the conventional parking cylinder vertical and horizontal tread brake device, the parking cylinder 01 occupies the space inside the vehicle body and the frame, and it is difficult to study the lightweight of the vehicle running part.

Therefore, the inventor provides a parking inverted tread brake device by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a parking inverted tread braking device, which can enable a parking cylinder to face a rail surface and does not occupy the space of a vehicle body and a framework.

The parking inverted tread brake device comprises a parking cylinder and a brake cylinder, wherein the parking cylinder body of the parking cylinder is separated from the brake cylinder body of the brake cylinder by a partition plate, and a first center hole is formed in the center of the partition plate; the brake cylinder body is internally provided with a brake piston capable of sliding in a sealing manner, the parking cylinder body is internally provided with a parking screw rod capable of moving back and forth, the end part of the parking screw rod can pass through the first center hole in a sealing manner and is abutted against the brake piston, the partition plate is horizontally arranged, the axis of the brake piston and the axis of the parking screw rod are coaxially and vertically arranged, the parking cylinder is arranged at the bottom of the brake cylinder and can face the rail surface, and the upper end of the parking screw rod can be abutted against the lower surface of the brake piston.

In a preferred embodiment of the present invention, the periphery of the upper surface of the partition plate is a flat surface, and the periphery of the lower surface of the brake piston is a downwardly convex curved surface capable of abutting against the flat surface and making a circumferential line contact with the flat surface.

In a preferred embodiment of the present invention, a parking piston capable of sliding in a sealing manner in an up-and-down reciprocating manner is further disposed in the parking cylinder, a second central hole is disposed at the center of the parking piston, and the parking screw rod can pass through the second central hole in a sealing manner in a sliding manner.

In a preferred embodiment of the present invention, a first sealing ring is interposed between the parking piston and the inner wall of the parking cylinder.

In a preferred embodiment of the present invention, the first sealing ring is a K-shaped rubber ring.

In a preferred embodiment of the present invention, a second seal ring is interposed between the first central hole and the parking screw.

In a preferred embodiment of the present invention, a third seal ring is interposed between the second central hole and the parking screw.

In a preferred embodiment of the present invention, the second sealing ring and the third sealing ring are both K-shaped rubber rings.

In a preferred embodiment of the present invention, the aperture of the first central hole is larger than the diameter of the parking screw, a first stepped hole which penetrates through the bottom surface of the partition plate and has an increased aperture is formed at the lower part of the first central hole, and an annular clamping groove is formed on the wall of the first stepped hole; the second sealing ring is embedded in the first stepped hole, an elastic clamping ring with a longitudinal notch is clamped in the annular clamping groove, and two end faces of the second sealing ring respectively abut against the hole shoulder of the first stepped hole and the end face of the elastic clamping ring.

In a preferred embodiment of the present invention, the second central hole has a diameter larger than that of the parking screw, a second stepped hole having an increased diameter is formed at an upper portion of the second central hole to penetrate through a top surface of the parking piston, and the third sealing ring is embedded in the second stepped hole.

In the parking inverted tread brake device, the parking cylinder and the cylinder body part of the brake cylinder are inverted compared with the tread brake device with the vertically-arranged parking cylinder in the prior art, and the orientation of the brake head part connected to the brake cylinder is kept unchanged, so that the parking cylinder is arranged at the bottom of the whole tread brake device and can face a rail surface, and the parking cylinder does not occupy the space of a vehicle body and a framework when in use, thereby being beneficial to the research on the light weight of a vehicle running part.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1: is a perspective view of the vertical tread braking device of the parking cylinder in the prior art.

FIG. 2: is a perspective view of a horizontal type tread braking device of a parking cylinder in the prior art.

FIG. 3: is a perspective view of the parking inverted tread brake device provided by the utility model.

FIG. 4 is a schematic view of: the utility model provides a partial section view of a parking inverted tread brake device.

FIG. 5: a partial enlarged view of the partition plate portion in fig. 4.

FIG. 6: which is a partial enlargement at a in fig. 4.

FIG. 7: the utility model provides a schematic diagram of a parking cylinder in a relieving position in a parking inverted tread braking device.

FIG. 8: the utility model provides a schematic diagram of a parking cylinder in a parking inverted tread braking device at a braking position.

FIG. 9: the utility model provides a schematic diagram of a parking cylinder in a manual quick release position in a parking inverted tread braking device.

FIG. 10: the utility model provides a partial section view of a parking inverted tread brake device.

The reference numbers illustrate:

the prior art is as follows:

01. a parking cylinder; 02. and (4) a brake cylinder.

The utility model comprises the following steps:

1. a parking cylinder; 11. parking the cylinder body; 111. a partition plate; 1111. a first central aperture; 1112. a first stepped hole; 1113. an annular neck; 1114. an elastic collar; 1115. a plane; 12. parking the screw rod; 13. parking the piston; 131. a second central aperture; 132. a second stepped bore; 14. a first seal ring; 15. a second seal ring; 16. a third seal ring;

101. a main spring; 102. a conical nut; 103. a conical seat; 104. a disc spring; 105. a screw rod return spring; 106. locking the latch; 107. a ratchet seat; 108. a stopping mandrel; 109. a lower cover;

2. a brake cylinder; 21. a brake cylinder; 22. a brake piston; 221. a cambered surface; 23. a piston return spring;

24. a diagonal bar; 25. a brake head suspension arm; 26. a first rotating shaft; 27. a brake head; 28. a gap adjusting mechanism; 29. and a lead screw.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

As shown in fig. 3 to 10, the parking inverted tread brake device according to the present embodiment includes a parking cylinder 1 and a brake cylinder 2, wherein the parking cylinder 11 of the parking cylinder 1 and the brake cylinder 21 of the brake cylinder 2 are separated by a partition plate 111, and a first center hole 1111 is opened in the center of the partition plate 111. The brake cylinder 21 is provided with a brake piston 22 capable of sliding in a sealing manner, the parking cylinder 11 is provided with a parking screw 12 capable of moving in a reciprocating manner, and the end of the parking screw 12 can pass through the first center hole 1111 in a sealing manner and abut against the brake piston 22. The partition plate 111 is horizontally arranged, the axis of the brake piston 22 and the axis of the parking screw 12 are coaxially and vertically arranged, the parking cylinder 1 is arranged at the bottom of the brake cylinder 2 and can face the rail surface, and the upper end of the parking screw 12 can abut against the lower surface of the brake piston 22.

The upper and lower directions mentioned herein refer to the upper and lower directions in the space when actually used, and the side of the whole tread braking device, which can face the track surface, is the bottom of the tread braking device, and the side of the tread braking device, which is back to the track surface, is the top of the tread braking device. For the structure that the parking cylinder is vertically placed as shown in fig. 1 in the prior art, the partition plate is horizontally placed, the axis of the brake piston and the axis of the parking screw rod are both vertically arranged, the parking cylinder is positioned above the brake cylinder, the parking cylinder is back to the rail surface, and the brake piston and the parking screw rod both move along the vertical direction when working. For the horizontal parking cylinder arrangement shown in fig. 2 in the prior art, the partition plate is vertically disposed, the axis of the brake piston and the axis of the parking screw are both horizontally disposed, and the brake piston and the parking screw move in the horizontal direction during operation. The structure shown in the prior art in fig. 1 and fig. 2 occupies the space of the vehicle body and the frame, while in the embodiment, the parking cylinder of the neutral structure in fig. 1 and the cylinder body part of the brake cylinder are inverted at the same time, the brake piston 22 and the parking screw 12 both move in the vertical direction when working, so that the parking cylinder 1 is arranged at the bottom of the whole tread brake device and can face the rail surface, and since the position under the vehicle body and close to the upper surface of the rail surface is limited by the vehicle boundary to leave a certain space, the parking cylinder 1 can be arranged under the brake cylinder 2, so that the parking cylinder 1 does not occupy the space of the vehicle body and the space of the side of the frame.

It will be appreciated that in this embodiment, the cylinder parts of both parking cylinder 1 and brake cylinder 2 and the internal parts of the respective cylinders are merely inverted together, the fitting relationship of the internal parts of the two cylinders is not changed, the lead screw 29 in the brake cylinder 21 is still horizontally disposed, and the orientation of the brake head part connected to the brake cylinder 21 is not changed. The brake head section is also connected in the prior art, an inclined rod 24 extending obliquely upwards is arranged at the upper part of the brake cylinder body 21, the top of the brake head suspension arm 25 is pivoted with the top of the inclined rod 24 through a first rotating shaft 26, and the bottom of the brake head suspension arm 25 is pivoted with the brake head 27 through a second rotating shaft. That is, the brake head sections of this embodiment are arranged in the same direction as the brake head sections of FIGS. 1 and 2, so that the first pivot 26 between the brake head boom 25 and the diagonal 24 is always at the top of the entire tread brake assembly to ensure that the brake head 27 will engage the associated brake shoe for a corresponding action.

Therefore, in the parking inverted tread brake device in the embodiment, the cylinder body parts of the parking cylinder 1 and the brake cylinder 2 are inverted compared with the tread brake device in which the parking cylinder is vertically placed in the prior art, and the orientation of the brake head part connected to the brake cylinder 2 is ensured to be unchanged, so that the parking cylinder 1 is arranged at the bottom of the whole tread brake device and can face a rail surface, the parking cylinder 1 does not occupy the space of a vehicle body and a framework when in use, and further the research on the light weight of a vehicle running part is facilitated.

In a specific implementation manner, as shown in fig. 4 and 6, the periphery of the upper surface of the partition plate 111 is a flat surface 1115, the periphery of the lower surface of the brake piston 22 is a downwardly convex arc surface 221, and the arc surface 221 can abut on the flat surface 1115 and form a circular line contact with the flat surface 1115.

The shape of the partition plate 111 is the same as that of the prior art, and the outer periphery of the upper surface is a plane 1115 (i.e., one circle of the outer periphery of the upper surface is a ring-shaped plane 1115), and the inner periphery is an upper tapered surface protruding upward from the plane 1115. The shape of the inner periphery of the lower surface of the brake piston 22 is the same as that of the prior art, and is a lower conical surface formed by upward depression (a gap is left between the lower conical surface and the upper conical surface, which is the prior art), and the center of the brake piston is provided with an arc-shaped bulge protruding downwards (the arc-shaped bulge is used for abutting against the parking screw 12); however, the shape of the outer periphery of the lower surface of the brake piston 22 is different from the prior art, in which the outer periphery of the lower surface is a plane and is in plane contact with the partition plate 111; in the embodiment, the arc surface 221 is adopted on the outer periphery of the lower surface of the brake piston 22 (that is, a circle of the outer periphery of the lower surface of the brake piston 22 protrudes downward to form the annular arc surface 221, and the position of the arc surface 221 is lower than that of the lower conical surface, so that only the arc surface 221 contacts with the plane 1115 when the brake piston 22 abuts against the partition plate 111), and a circumferential line contact mode is formed at the contact position of the brake piston 22 and the partition plate 111, so that the contact area between the brake piston 22 and the partition plate 111 can be reduced, the adaptability of the brake piston 22 moving in the brake cylinder 21 is increased, compared with the existing plane contact mode, the sensitivity of the brake piston 22 under air pressure is effectively improved, and the transmission efficiency of the product brake force is improved.

Further, a parking piston 13 capable of sliding in a sealing manner up and down is further arranged in the parking cylinder 11, a second center hole 131 is formed in the center of the parking piston 13, and the parking screw 12 can pass through the second center hole 131 in a sealing manner in a sliding manner. In order to ensure the sealing performance of all parts, a first sealing ring 14 is clamped between the parking piston 13 and the inner wall of the parking cylinder 11, a second sealing ring 15 is clamped between the first center hole 1111 and the parking screw 12, and a third sealing ring 16 is clamped between the second center hole 131 and the parking screw 12.

Because the cylinder body parts of the parking cylinder 1 and the brake cylinder 2 are arranged in an inverted manner in the embodiment, in order to compress the overall height of the parking cylinder 1, the design structure space of the parking cylinder 1 is more compact, and products are prevented from exceeding the limit of a vehicle, namely, the tread brake device is prevented from interfering with surrounding parts under the limit working conditions (wheel abrasion and downward vehicle settlement). As shown in fig. 4 and 5, the first sealing ring 14 is preferably a K-shaped rubber ring (i.e. the cross section of the first sealing ring is K-shaped, which is a prior art), and compared with the prior art in which the first sealing ring 14 is of a cup-shaped structure, the K-shaped ring occupies a smaller space, does not occupy a large space inside the parking cylinder 11, and plays a great role in space utilization in the parking cylinder 11, so as to reduce the height of the parking cylinder 1.

The second sealing ring 15 and the third sealing ring 16 are preferably K-shaped rubber rings. Because the parking screw 12 frequently moves up and down in the parking braking and applying process, a guide mechanism such as a copper sleeve and a corresponding sealing mechanism are added in the first center hole 1111 and the second center hole 131 to realize guiding and sealing in the prior art, and the internal space of the parking cylinder 11 is occupied; in this embodiment no longer set up guiding mechanism such as copper sheathing in these two positions, directly utilize K shape rubber circle can not only guarantee to park jar 1's leakproofness, and the resistance of K shape rubber circle is less moreover, can also utilize the flexible rigidity of K shape rubber circle better to play good guide effect, has effectively saved the inner space of parking jar 1 to reduce the height of parking jar 1.

Further, as shown in fig. 5, in order to facilitate installation of the second seal ring 15, the aperture of the first center hole 1111 is larger than the diameter of the parking screw 12, a first stepped hole 1112 which penetrates through the bottom surface of the partition plate 111 and has an increased aperture is formed at the lower portion of the first center hole 1111, and a ring-shaped slot 1113 is formed on the hole wall of the first stepped hole 1112. The second sealing ring 15 is embedded in the first stepped hole 1112, an elastic collar 1114 with a longitudinal notch is clamped in the ring-shaped clamping groove 1113, and two end faces of the second sealing ring 15 respectively abut against a hole shoulder of the first stepped hole 1112 and an end face of the elastic collar 1114.

In order to facilitate the installation of the third sealing ring 16, the diameter of the second central hole 131 is larger than the diameter of the parking screw 12, a second stepped hole 132 with an increased diameter is formed at the upper portion of the second central hole 131, and the third sealing ring 16 is embedded in the second stepped hole 132.

In conclusion, in the parking inverted tread brake device in the embodiment, the parking cylinder 1 is arranged at the bottom of the tread brake device, and the parking cylinder 1 is inverted and faces the track surface, so that the installation space of a vehicle body and a bogie frame is not occupied, and the application cost of the vehicle can be reduced; meanwhile, the overall height and the shape of the parking cylinder 1 are optimally designed (the overall height is reduced, the overall size is more compact, and the parking cylinder is miniaturized and lightened), the problem that products exceed the vehicle limit and the running part is lightened can be effectively solved, and the parking cylinder is suitable for high-speed locomotives, passenger cars, motor train units, light rail vehicles, subway vehicles, engineering vehicles and the like.

In the present embodiment, only the cylinder body portions of the parking cylinder 1 and the brake cylinder 2 are disposed upside down, the vertical positions of the parking cylinder 1 and the brake cylinder 2 during operation are reversed, and the structures of the first seal ring 14, the second seal ring 15, and the third seal ring 16 in the parking cylinder 1 are optimized to reduce the overall height. The respective sizes of the products are also appropriately adjusted as required. The structure, the connection relationship and the working principle of the parking screw 12, the parking piston 13 and other parts in the parking cylinder 1 are the prior art, the structure, the connection relationship and the working principle of the brake piston 22 and other parts in the brake cylinder 2 are the prior art, and the structure and the working engineering of the parking cylinder 1 and the brake cylinder 2 are simply described as follows:

the partition plate 111 is integrally formed with the parking cylinder 11, and the brake cylinder 21 is generally fastened to the parking cylinder 11 by bolts and transmits braking force between the parking screw 12 and the brake piston 22.

The parking cylinder 1 comprises a parking piston 13, a parking screw 12, a main spring 101, a conical nut 102 (with a bearing), a conical seat 103 (the conical seat 103 is in threaded connection with the parking piston 13), a disc spring 104, a screw restoring spring 105, a locking ratchet tongue 106, a ratchet seat 107, a stopping mandrel 108 and the like, the structure adopts a conical clutch structure, mechanical opening and closing actions are realized by utilizing the change of the angle of a matching surface between the conical nut 102 and the conical seat 103, the clutch is quick in opening and closing response, compact in structure and high in test reliability, and the parking cylinder is specifically the prior art. The parking brake function of the whole parking inverted tread brake device is mainly used for the static parking of a locomotive and a vehicle, wherein the parking function has three conditions, namely a release position (the brake cylinder 2 is in a release and brake state at the moment), a brake position and a manual quick release position, and the principle is as follows:

(1) relief position

When the locomotive, vehicle is running normally or service brake is applied, the parking cylinder 1 is in the release position. When the parking cylinder 1 is in the release position, the parking piston 13 compresses the main spring 101 in the parking cylinder 1 under the action of the total wind pressure, so that the parking cylinder 1 is in the release state.

(2) Brake position

When the locomotive and the vehicle are stopped, the compressed air in the parking cylinder 1 is discharged, the main spring 101 of the parking cylinder 1 is released, and the parking piston 13 and the parking screw 12 simultaneously move upwards under the action of the main spring 101 of the parking cylinder 1, so that the parking piston and the parking screw 12 generate braking force. The braking force is acted on the wheel tread by the parking piston 13 in the parking cylinder 1, the cone nut 102, the parking screw 12, the brake piston 22 in the brake cylinder 2, the amplifying lever, the clearance adjusting mechanism 28, the brake head 27 and the brake shoe, and finally the locomotive and the vehicle are parked in a stationary mode.

(3) Manual quick release position

The parking cylinder 1 has a mechanical structure for manually operating the locking pawl 106 and the ratchet seat 107, so that the structure can be operated in a near and a far distance, and the aim of manual quick release can be achieved.

When the parking brake is applied and the hand release operation is performed, the locking ratchet tongue 106 is released from the ratchet seat 107, the force held on the parking screw 12 disappears, and the parking cylinder 1 generates a strong upward force due to the main spring 101 and converts it into a torque force, so that the parking screw 12 and the ratchet seat 107 simultaneously generate a rotational force and rotate downward, and move away from the cone nut 102 by a certain distance.

After the parking piston 13 has been moved, the locking spindle 108 is pushed upwards by a latch-catch spring (which serves to reset the latch) and abuts against the locking latch 106 which is no longer engaged with the ratchet seat 107, so that it keeps the locking latch 106 and the ratchet seat 107 still in a released state. The parking screw 12 continues to move downward until it hits the lower cover 109 under the reaction force of the brake piston 22 and the piston return spring 23 and the force of the screw return spring 105. During the downward movement of the parking screw 12, the power of the rotating part causes a tendency for the conical nut 102 to rotate upwards on the parking screw 12, at which point the K-face of the conical nut 102 is loosened and the conical nut 102 also starts to rotate, rotating with the parking screw 12 and the ratchet seat 107 until its power is consumed by internal friction. At this time, the tread brake is in the manual quick release position.

(4) The parking cylinder 1 is filled with compressed air to a relieving position

Charging parking cylinder 1 with a set value of compressed air pushes parking piston 13 to move against main spring 101. When the end position is reached, the main spring 101 of parking cylinder 1 is compressed, at which point parking cylinder 1 is ready for the next braking.

Brake cylinder 2 adopts cam amplification formula principle to realize brake force output, and concrete structure is prior art, and the theory of operation is as follows:

when the brake cylinder 2 is filled with compressed air, the brake piston 22 moves, and meanwhile, the clearance adjusting mechanism 28 is driven to move; when the retaining ring abuts the limit stop of the housing, the slack adjuster mechanism 28 is moved by an action travel X, which disengages the trigger lead nut. The distance X traveled before this critical point is reached is no adjustment action, beyond which the lead nut begins to disengage and rotate. The braking action does not exceed the critical point during the non-abrasion process.

When the clearance value of the brake shoe exceeds a set value (abrasion occurs on wheels and the brake shoe), at the moment, compressed air pushes the brake piston 22 to drive the clearance adjusting mechanism 28 to continuously advance, the positioning ring abuts against the limit stop and cannot advance together with the screw rod, the screw rod pulls the guide nut apart by the reverse acting force of the forward direction of the screw rod and the backward direction of the positioning ring and continuously rotates, the guide nut moves backward relative to the screw rod in the process, the distance between the two nuts is increased by V, and the total distance of forward advance of the screw rod is X + V at the moment.

During releasing, the piston restoring spring 23 pushes the brake piston 22, and the releasing spring drives the clearance adjusting mechanism 28 to start to retreat, and at the moment, the front nut and the rear nut are both in an engaged state. When the screw rod moves back by the distance X, the positioning ring is attached to the position of the rear cover, and the screw rod cannot move back continuously; the clearance adjusting mechanism 28 is driven by the release spring to continuously retreat, the adjusting nut is pulled open by the reaction force of the adjusting nut and the screw rod and continuously rotates on the non-self-locking screw rod, the adjusting nut moves backwards relative to the screw rod in the process, the distance between the two nuts is reduced by V, and the backward travel distance of the screw rod is X. At this point, the adjustment is complete and the lash adjuster compensation amount is V.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the utility model should fall within the protection scope of the utility model.

Claims (10)

1. A parking inverted tread brake device comprises a parking cylinder and a brake cylinder, wherein the parking cylinder body of the parking cylinder is separated from the brake cylinder body of the brake cylinder through a partition plate, and a first center hole is formed in the center of the partition plate; a brake piston capable of sliding in a sealing manner is arranged in the brake cylinder body, a parking screw rod capable of moving in a reciprocating manner is arranged in the parking cylinder body, the end part of the parking screw rod can pass through the first central hole in a sealing and sliding manner and is abutted against the brake piston,

the partition plate is horizontally arranged, the axis of the brake piston and the axis of the parking screw rod are coaxially and vertically arranged, the parking cylinder is arranged at the bottom of the brake cylinder and can face a rail surface, and the upper end of the parking screw rod can be abutted against the lower surface of the brake piston.

2. The parking inverted tread brake of claim 1,

the periphery of the upper surface of the partition plate is a plane, the periphery of the lower surface of the brake piston is a downward convex cambered surface, and the cambered surface can abut against the plane and form circumferential line contact with the plane.

3. The parking inverted tread brake of claim 1,

the parking cylinder body is internally provided with a parking piston capable of sliding in a sealing mode up and down, a second center hole is formed in the center of the parking piston, and the parking screw rod can penetrate through the second center hole in a sealing sliding mode.

4. The parking inverted tread brake apparatus of claim 3,

a first sealing ring is clamped between the parking piston and the inner wall of the parking cylinder body.

5. The parking inverted tread brake of claim 4,

the first sealing ring is a K-shaped rubber ring.

6. The parking inverted tread brake of claim 3,

and a second sealing ring is clamped between the first central hole and the parking screw rod.

7. The parking inverted tread brake apparatus of claim 6,

and a third sealing ring is clamped between the second central hole and the parking screw rod.

8. The parking inverted tread brake of claim 7,

the second sealing ring and the third sealing ring are both K-shaped rubber rings.

9. The parking inverted tread brake apparatus of claim 6,

the aperture of the first central hole is larger than the diameter of the parking screw rod, a first stepped hole which penetrates through the bottom surface of the partition plate and is increased in aperture is formed in the lower portion of the first central hole, and an annular clamping groove is formed in the hole wall of the first stepped hole; the second sealing ring is embedded in the first stepped hole, an elastic clamping ring with a longitudinal notch is clamped in the annular clamping groove, and two end faces of the second sealing ring respectively abut against the hole shoulder of the first stepped hole and the end face of the elastic clamping ring.

10. The parking inverted tread brake of claim 7,

the aperture of the second center hole is larger than the diameter of the parking screw rod, a second stepped hole which penetrates through the top surface of the parking piston and is increased in aperture is formed in the upper portion of the second center hole, and the third sealing ring is embedded in the second stepped hole.

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