WO2022142451A1 - Parking brake cylinder and brake clamp unit - Google Patents

Abstract

A parking brake cylinder, comprising a parking cylinder body (1), a middle body (2), a brake cylinder body (3), a mitigation device (5) and a force transmission device (6). A tubular boss (21) is provided in the middle portion of the middle body (2), and a brake lead screw (31) penetrates the tubular boss (21); a parking piston (11) is sleeved on the exterior of the tubular boss (21), and the parking piston (11) and the parking cylinder body (10) form a parking cylinder cavity (10); the brake lead screw (31) is connected to the brake piston (32), and the brake piston (32) and the brake cylinder body (3) form a brake cylinder cavity (30); and the parking piston (11) is connected to the mitigation device (5) by means of a parking nut (12) and the parking lead screw (13), and the parking piston (11) is connected to the brake piston (32) by means of the force transmission device (6). In the parking brake cylinder (100), force transmission between the parking lead screw (13) and the brake piston (32) is controlled by means of the mitigation device (5) and the force transmission device (6), and then application of a parking brake force is controlled.

Description

Parking brake cylinder and brake caliper unit

This application claims the priority of the Chinese patent application with the application number 202011601358.1 and the invention titled "parking brake cylinder and brake caliper unit" filed with the China Patent Office on December 29, 2020, the entire contents of which are incorporated by reference in in this application.

technical field

The application belongs to the technical field of rail vehicle braking, and in particular relates to a parking brake cylinder and a brake caliper unit.

Background technique

Spring-loaded parking cylinders are used to provide long-term parking braking power for vehicles, and are usually used in conjunction with brake cylinders that provide driving braking power for vehicles. The working principle of the parking cylinder is: the pressure medium is filled into the parking cylinder cavity to relieve the parking brake, and the pressure medium is discharged to apply the parking brake by the compression spring force.

The invention application of publication number CN109094604A discloses a parking brake device, which includes a master brake cylinder, the master brake cylinder has a master brake cavity and a master piston that can move axially and is arranged in the master brake cavity. One side of the piston is connected with a piston rod that can pass through the main brake cylinder, and the other side of the main piston is connected with a lead screw pair; the parking brake cylinder has a parking brake cavity and can be moved axially. The parking piston in the brake chamber, one side of the parking piston is connected with a parking rod, the other side of the parking piston and the parking brake cylinder are connected with an elastic piece, and the end of the parking rod can be clamped with the lead screw pair or separation. In the parking brake device, the moving direction of the main piston is perpendicular to the moving direction of the parking piston, and the force of the master brake cylinder is used as the source of the parking braking force.

There are more and more devices under the vehicle in existing vehicles, and the parking brake cylinder, which has both the parking brake and the service brake, has a large volume and occupies a large space at the bottom of the vehicle.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present application provides a parking brake cylinder and a brake caliper unit.

The technical solution of this application is as follows:

The present application provides a parking brake cylinder, including a parking cylinder, an intermediate body, and a brake cylinder, wherein the middle of the intermediate body has a tubular boss penetrating through the parking cylinder, and a brake is provided through the tubular boss. lead screw;

Outside the tubular boss, between the parking cylinder and the intermediate body, a parking piston is sleeved, the parking piston and the parking cylinder form an air-tight parking cylinder cavity, and the parking piston and the A first elastic element group is arranged between the intermediate bodies; a brake piston connected to the brake screw is arranged between the intermediate body and the brake cylinder, and the brake piston is connected to the brake cylinder. The moving cylinder body forms an airtight brake cylinder cavity;

A parking nut connected to the parking piston is sleeved on the outside of the tubular boss; a parking screw is sleeved outside the tubular boss, and the parking screw and the parking nut have matching trapezoidal threads ;

A relief device connected to the parking screw is installed on the intermediate body. When the relief device is in an unlocked state, the parking screw and the parking nut can be unscrewed. When the relief device is in a locked state When the parking screw and the parking nut cannot be unscrewed;

A force transmission device is provided outside the parking screw, the force transmission device is connected with the brake piston, and a second elastic element group is arranged between the force transmission device and the parking piston. When the device is in the first state, there is an axial force transmission between the parking screw and the brake piston, and when the force transmission device is in the second state, the parking screw and the brake piston are in contact with each other. There is no axial force transmission between;

When the pressure in the parking cylinder cavity is zero and the parking piston is in contact with the parking cylinder, the relief device is in an unlocked state, and the force transmission device is in a second state; when the parking cylinder cavity is filled with When the medium of rated pressure is used, the relief device is switched from the unlocked state to the locked state, and the force transmission device maintains the second state; when the relief device is in the locked state, the medium in the parking cylinder cavity is discharged, which can be The force transmission device is switched from the second state to the first state, and the brake piston moves close to the intermediate body driven by the force transmission device.

In some embodiments of the present application, the parking brake cylinder has:

A complete relief state, in which the pressure in the parking cylinder cavity is zero, the parking piston is in contact with the parking cylinder, the relief device is in an unlocked state, and the force transmission device is in a second state, The length of the parking screw and the parking nut is the shortest;

In the fully relieved state, filling the parking cylinder cavity with a medium with a pressure not lower than the rated pressure can make the parking brake cylinder enter the inflated relief state; in the inflated relief state, the parking piston travels to the relief position , the relief device is switched to the locked state, the force transmission device maintains the second state, the first elastic element group and the second elastic element group are compressed, and the parking screw is screwed with the parking nut longest length;

In the charging relief state, the medium under the pressure in the parking cylinder cavity can be discharged, so that the parking brake cylinder can enter the parking braking state; The lead screw and the parking nut keep the longest screwing length, and the elastic restoring force of the first elastic element group makes the parking piston drive the parking nut, and then drive the parking screw along its axial direction, that is, the first In an axial direction, close to the parking cylinder, the force transmission device is switched to the first state.

In some embodiments of the present application, the parking brake cylinder has a semi-charged relief state;

In the semi-inflated relief state, filling the parking cylinder cavity with a medium less than the rated pressure can make the parking brake cylinder enter the semi-inflated relief state; in the semi-inflated relief state, the parking piston does not travel to In the relief position, the relief device is kept in the unlocked state, and the force transmission device is kept in the second state.

In some embodiments of the present application, the relief device includes: a ratchet, a pawl matched with the ratchet, and a relief mechanism connected with the pawl to control the positional relationship between the ratchet and the pawl; the The inner wall of the parking screw is provided with an axially extending first chute, and the ratchet has a guide rod slidably connected with the first chute;

The relief mechanism enables the pawl to be inserted into the ratchet wheel, thereby restricting the parking screw from rotating out of the parking nut, and the relief device is in a locked state; the relief mechanism enables the pawl to disengage from the ratchet wheel, Then, the restriction on the parking screw from being rotated out of the parking nut is released, and the relief device is in an unlocked state.

In some embodiments of the present application, the force transmission device includes a support ring fixedly connected with the parking screw;

A force transmission ring is also provided on the opposite side of the support ring and the parking piston, the force transmission ring is installed with a symmetrically arranged force transmission sleeve, and the force transmission sleeve is along the axial direction of the force transmission ring. Passing through the intermediate body, the inner wall of the force transmission sleeve is provided with a stopper;

The power transmission sleeve is provided with a power transmission rod, the first end of the power transmission rod is connected with the brake piston, the second end of the power transmission rod is connected with a limiting member, and the stop part The inner diameter is smaller than the outer diameter of the limiting piece, and the limiting piece is located on the side of the stopper portion close to the parking cylinder.

The present application further provides a brake caliper unit, which includes a caliper component and the aforementioned parking brake cylinder, wherein the caliper component includes two booms, and the booms are used for connecting with a bogie;

a brake pad holder connected with the boom, the brake pad holder is used to install the brake pad;

a clamp arm connected with the brake pad holder;

The parking brake cylinder is hinged to the clamp arm through a connecting bolt;

The parking brake caliper unit is flexibly connected to the bogie through rubber nodes.

Compared with the prior art, the beneficial effects of the present application are:

Through the cooperation of the force transmission device and the relief device, the elastic restoring force of the first elastic element group is transmitted between the parking piston and the brake piston, and is transmitted from the brake piston to the brake screw, thereby realizing service braking and parking. Braking is output through the brake screw. The coaxial series combination of the parking cylinder cavity and the brake cylinder cavity makes the structure of the entire parking brake cylinder more compact, without increasing the longitudinal and vertical dimensions of the brake cylinder, and the parking brake cylinder and the rail surface have a greater ground clearance Clearance, reducing the probability of the parking brake cylinder being hit by foreign objects. In addition, the weight of the parking brake cylinder is reduced, and the center of gravity of the entire parking brake cylinder is closer to the center, and the connection with the brake caliper unit is more stable. The parking cylinder cavity and the brake cylinder cavity are isolated by the intermediate body, so as to avoid the risk of wind blowing between the brake cylinder cavity and the parking cylinder cavity, so that the reliability of the parking brake cylinder is higher.

Description of drawings

FIG. 1 is a cross-sectional view 1 of a parking brake cylinder in a fully relieved state according to an embodiment of the present application;

2 is a cross-sectional view 2 of the parking brake cylinder in a fully relieved state according to an embodiment of the present application;

FIG. 3 is a cross-sectional view 1 of the parking brake cylinder in an inflated relief state according to an embodiment of the present application;

FIG. 4 is a cross-sectional view 2 of the parking brake cylinder in an inflated relief state according to an embodiment of the present application;

5 is a sectional view 1 of the parking brake cylinder in a parking braking state according to an embodiment of the present application;

6 is a cross-sectional view 2 of the parking brake cylinder in a parking braking state according to an embodiment of the present application;

7 is a cross-sectional view of the parking brake cylinder in a semi-inflated relief state according to an embodiment of the present application;

Fig. 8 is a partial enlarged schematic diagram of part A in Fig. 1;

9 is a schematic structural diagram of a mitigation device in an unlocked state according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a mitigation device in a locked state according to an embodiment of the present application;

Fig. 11 is a partial enlarged schematic diagram of part B in Fig. 1;

12 is a schematic structural diagram of a mitigation mechanism according to an embodiment of the present application;

Fig. 13 is the structural representation of the intermediate of an embodiment of the present application;

14 is a schematic structural diagram of a mitigation mechanism according to an embodiment of the present application, wherein the first shaft is in a second position;

Fig. 15 is a schematic structural diagram of the relief mechanism in Fig. 14, wherein the first shaft is in the first position;

Fig. 16 is a schematic structural diagram of a relief mechanism according to another embodiment of the present application, wherein the first shaft is in a second position;

Fig. 17 is a schematic structural diagram of the relief mechanism in Fig. 16, wherein the first shaft is in the first position;

Fig. 18 is a schematic structural diagram of a mitigation mechanism according to an embodiment of the present application, wherein the first shaft is in a first position;

Figure 19 is a schematic structural diagram of the relief mechanism in Figure 18, wherein the first shaft is in a second position;

20 is a schematic structural diagram of a force transmission device according to an embodiment of the present application;

Figure 21a is a schematic structural diagram of a parking cylinder according to an embodiment of the present application;

Figure 21b is a schematic structural diagram of a brake cylinder according to an embodiment of the present application;

22 is a schematic cross-sectional view of a parking brake cylinder according to an embodiment of the present application;

23 is a schematic structural diagram of a brake caliper unit according to an embodiment of the present application;

Number in the figure: 1. Parking cylinder; 101, First bottom; 102, First side wall; 103, First air hole; 104, Second through hole; 105, First sealing ring; 106, Second sealing ring; 107, the third sealing ring; 10, the parking cylinder cavity; 11, the parking piston; 111, the first pit; 112, the guide column; 12, the parking nut; 13, the parking screw; 131, the first chute; 14, Trapezoidal thread; 15, first thread; 2, intermediate body; 21, tubular boss; 211, first through hole; 22, first groove; 23, support pad; 24, cover plate; 25, second pit 301, the second bottom; 302, the second side wall; 303, the second air hole; 304, the fourth sealing ring; 30, the brake cylinder cavity; 31, the brake screw; 32, brake piston; 4, first elastic element group; 5, relief device; 501, first pin; 502, second pin; 503, third pin; 504, housing; 505, 506, the second chute; 51, the ratchet wheel; 511, the guide rod; 512, the ratchet tooth; 52, the pawl; 53, the first rotating member; 531, the second groove; 54, the first shaft; 541, first end; 542, second end; 543, thin shaft; 544, thick shaft; 545, fourth groove; 55, first cam; 551, third groove; 552, first curved surface; 553, the second curved surface; 554, the sliding rod; 573, the sleeve; 561, the first raised part; 562, the second raised part; 57, the relief component; 571, the lever; 572, the slider; 581, the first Spring seat; 582, limit seat; 583, second spring seat; 59, first return spring; 60, locking pin; 601, first part; 6011, end of first part; 602, second part; 603 second reset Spring; 6, force transmission device; 61, support ring; 62, force transmission ring; 621, lug; 63, force transmission sleeve; 631, step hole; 6311, large hole; 6312, small hole; 64, stopper part; 65, dowel rod; 651, first end; 652, second end; 66, limiter; 67, thrust bearing; 68, second thread; 7, second elastic element group; 8, clearance adjustment device ;81, first adjusting nut; 82, thrust tube; 83, connecting seat; 100, parking brake cylinder; 200, clamp; 300, boom; 400, brake pad holder; 500, clamp arm; 600, connection Bolts; 700, rubber joints.

Detailed ways

The technical solutions of the present application will be described in detail below in conjunction with specific embodiments, however, it should be understood that elements, structures and features in one embodiment can also be beneficially combined into other embodiments without further description.

In the description of the present application, it should be understood that the terms "first", "second", etc. are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or implying the number of indicated technical features . Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature.

In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "bottom", "inside", etc. is based on the orientation or positional relationship shown in the corresponding drawings, and is only for the convenience of describing the present invention and simplification It is described, rather than indicated or implied, that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated connection. Ground connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The described embodiments are only to describe the preferred embodiments of the present application, not to limit the scope of the present application. On the premise of not departing from the design spirit of the present application, various modifications made by those of ordinary skill in the art to the technical solutions of the present application and improvements, shall fall within the scope of protection determined by the claims of this application. For the convenience of description, the direction parallel to the axis of the parking screw is referred to as the first axial direction, and the direction parallel to the axis of the first shaft is referred to as the second axial direction.

When the train is running or stopped for a short time, the brake can be applied by charging the brake cylinder, and the brake applied by the brake cylinder is called the service brake. When the vehicle is parked for a long time, in order to prevent the train from slipping due to the lack of wind to apply the brake, a parking cylinder is provided that can apply the brake through a compression spring. Generally, the parking cylinder and the brake cylinder are integrated together, which is called the parking brake cylinder. As shown in FIGS. 1-2 , a parking brake cylinder 100 provided for an embodiment of the application includes a parking cylinder block 1 , an intermediate body 2 , and a brake cylinder block 3 . The tubular boss 21, the tubular boss 21 is provided with a brake screw 31 through it;

Outside the tubular boss 21, between the parking cylinder 1 and the intermediate body 2, a parking piston 11 is sleeved. A first elastic element group 4 is provided; a brake piston 32 connected to the brake screw 31 is arranged between the intermediate body 2 and the brake cylinder block 3, and the brake piston 32 and the brake cylinder block 3 form an air-tight brake. Cylinder cavity 30;

A parking nut 12 connected to the parking piston 11 is sleeved outside the tubular boss 21; a parking screw 13 is also sleeved outside the tubular boss 21, and the parking screw 13 and the parking nut 12 have matching trapezoidal threads 14;

The intermediate body 2 is provided with a relief device 5 connected to the parking screw 13. When the relief device 5 is in an unlocked state, the parking screw 13 and the parking nut 12 can be unscrewed. When the relief device 5 is in a locked state, the parking screw 13 and the parking nut 12 cannot be unscrewed;

There is a force transmission device 6 outside the parking screw 13, the force transmission device 6 is connected with the brake piston 32, and a second elastic element group 7 is arranged between the force transmission device 6 and the parking piston 11. When the force transmission device 6 is in the first In the state, there is axial force transmission between the parking screw 13 and the brake piston 32, and when the force transmission device 6 is in the second state, there is no axial force transmission between the parking screw 13 and the brake piston 32;

When the pressure in the parking cylinder cavity 10 is zero and the parking piston 11 is in contact with the parking cylinder 1, the relief device 5 is in the unlocked state, and the force transmission device 6 is in the second state; When the medium is in the state, the release device 5 is switched from the unlocked state to the locked state, and the force transmission device 6 remains in the second state; when the release device 5 is in the locked state, the medium in the parking cylinder cavity 10 is discharged, so that the force transmission device 6 can be released from the second state. The second state is switched to the first state.

In the parking brake cylinder provided by the application, the parking cylinder cavity and the brake cylinder cavity are coaxially arranged, the parking braking force is provided by the elastic restoring force of the first elastic element group arranged between the parking piston and the intermediate body, and the parking braking force is The application method is as follows: the elastic restoring force is applied to the braking part of the vehicle through the parking piston, the parking nut, the parking screw and the braking piston in sequence, and then the braking screw connected with the braking piston is applied. The parking brake cylinder provided by the present application controls whether the parking nut and the parking screw can be screwed out through the alleviation device, thereby controlling the transmission of force between the two, and the force transmission device controls the gap between the parking screw and the brake piston. transmission of force. When the relief device is in the unlocked state, the elastic restoring force cannot be transmitted from the parking nut to the parking screw, and thus cannot be transmitted from the parking screw to the brake piston. The premise of switching to the first state, and only when the force transmission device is in the first state, the parking brake cylinder has the ability to apply the parking braking force.

Specifically, the parking brake cylinder 100 has:

Complete relief state, as shown in Figures 1 and 2, in the complete relief state, the pressure in the parking cylinder chamber 10 is zero, the parking piston 11 is in contact with the parking cylinder 1, the relief device 5 is in the unlocked state, and the force transmission device 6 is in the In the second state, the length of the parking screw 13 and the parking nut 12 is the shortest. At this time, the first elastic element group 4 makes the parking piston 11 abut against the parking cylinder 1, the first elastic element group 4 transmits the inelastic restoring force to the parking nut 12, and the parking brake cylinder 100 cannot apply the parking braking force, but it can be applied The service braking force, that is, when the brake cylinder cavity 30 is filled with a medium, the brake screw 31 can be driven by the brake piston 32 to generate the service braking force.

As shown in FIGS. 3 and 4 , in the fully relieved state, filling the parking cylinder cavity 10 with a medium with a pressure not lower than the rated pressure can make the parking brake cylinder 100 enter the inflated relief state; in the inflated relief state, the parking The piston 11 travels to the relief position, the relief device 5 is switched to the locked state, the force transmission device 6 maintains the second state, the first elastic element group 4 and the second elastic element group 7 are compressed, and the parking screw 13 is screwed with the parking nut 12 longest length. At this time, the elastic restoring force of the first elastic element group 4 is the largest, and is balanced with the pressure of the medium in the parking cylinder cavity 10 , there is no axial force transmission between the parking screw 13 and the brake piston 32 , and the braking screw 31 The parking brake cannot be applied, but the service brake can still be applied.

As shown in FIG. 5 and FIG. 6 , in the charging relief state, the pressure medium in the parking cylinder cavity 10 is discharged, so that the parking brake cylinder 100 can enter the parking braking state; in the parking braking state, the relief device 5 keeps In the locked state, the parking screw 13 and the parking nut 12 maintain the longest screwing length, and the elastic restoring force of the first elastic element group 4 enables the parking piston 11 to drive the parking nut 12, thereby driving the parking screw 13 along its axial direction, that is, along its axis. In the first axial direction, close to the parking cylinder 1 , the force transmission device 6 connected with the parking screw 13 is switched from the second state to the first state, and the brake piston 32 moves close to the intermediate body 2 driven by the force transmission device 6 . At this time, the elastic restoring force of the first elastic element group 4 is transmitted between the parking nut 12 and the parking screw 13, and between the parking screw 13 and the brake piston 32, and the elastic restoring force of the first elastic element group 4 is related to the parking brake. The reaction force of the power is balanced. At this time, the brake screw 31 applies the parking braking force.

When the parking brake cylinder 100 switches from the fully relieved state to the inflated relieved state, it will pass through an intermediate state, which is a semi-inflated relieved state. As shown in FIG. 7 , there is a medium in the parking cylinder cavity 10 , but the pressure of the medium is less than the rated pressure. , the parking piston 11 has not reached the relief position, the relief device 5 cannot be switched to the locked state, and therefore, the force transmission device 6 cannot be switched from the second state to the first state. At this time, the elastic restoring force of the first elastic element group 4 increases gradually, and balances with the pressure of the constantly changing medium in the parking cylinder cavity 10, between the parking nut 12 and the parking screw 13, and between the parking screw 13 and the brake There is no axial force transmission between the pistons 32, and the brake screw 31 cannot apply the parking brake force, but can apply the service brake force.

The parking brake cylinder 100 is set to a fully relieved state, in order to isolate the parking cylinder cavity 10 of the faulty vehicle under special circumstances (such as rescue conditions), so as to ensure that the accidental charging and discharging of the medium in the parking cylinder cavity 10 will not produce a parking braking effect. , which can be used to prevent the accidental application of the parking brake and cause damage to the vehicle, but fill the brake cylinder cavity 30 with a medium, and the brake piston 32 can apply the service braking force through the brake screw 31 to ensure that the faulty vehicle can be applied during rescue. Driving braking force.

Specifically, as shown in FIGS. 8-10 , the relief device 5 includes a ratchet wheel 51 , a pawl 52 matched with the ratchet wheel 51 , and a relief mechanism connected with the pawl 52 to control the positional relationship between the pawl 52 and the ratchet wheel 51 . The inner wall of the lever 13 is provided with a first sliding groove 131 extending along the first axial direction, and the ratchet wheel 51 has a guide rod 511 slidably connected with the first sliding groove 131 ; The parking screw 13 is unscrewed from the parking nut 12, and the relief device 5 is in a locked state; the relief mechanism makes the pawl 52 disengage from the ratchet 51, thereby releasing the restriction on the parking screw 13 from being rotated out of the parking nut 12, and the relief device 5 is in an unlocked state. The rotation axis of the ratchet wheel 51 is consistent with the axis direction of the parking screw 13 , so the rotation axis of the pawl 52 can be set parallel to the axis direction of the parking screw 13 , so that the pawl 52 can be inserted into or disengaged from the ratchet tooth 512 . The rotating shaft of the pawl 52 can also be set in other forms, as long as the rotation can drive the pawl 52 to insert or disengage from the ratchet teeth 512 .

As shown in Figures 8-10, the direction of rotation of the trapezoidal thread 14 is the first direction, which is set in the direction of the ratchet wheel 51. When the relief device 5 is in the locked state, the relief mechanism can make the pawl 52 lock the ratchet wheel 51 in the opposite direction in the first direction. Rotation in the direction of rotation, thereby restricting the rotation of the parking screw 13 connected with the ratchet 51 in the opposite direction in the first direction, so that the parking screw 13 cannot be unscrewed from the parking nut 12, but the guide rod 511 and the first chute 131 The relative movement in the axial direction is not restricted, and the rotation of the ratchet 51 in the first direction is not restricted. Therefore, when the relief device 5 is in the locked state, the parking nut 12 can drive the parking screw 13 to move linearly along the first axial direction relative to the ratchet 51 under the action of the elastic restoring force of the first elastic element group 4, and during the movement, the parking The lead screw 13 and the parking nut 12 keep the longest screwing length, and the pawl 52 remains inserted into the ratchet 51 .

Specifically, as shown in FIGS. 9 and 10 , the ratchet 51 is provided with ratchet teeth 512 arranged at a certain angle on the outer circumference, and the relief mechanism includes: a first rotating member 53 rotatably connected to the intermediate body 2 through a first pin 501 , the pawl 52 is arranged on the first rotating member 53; the first shaft 54 connected with the first rotating member 53; 55;

The movement of the first shaft 54 can drive the first rotating member 53 to rotate around the first pin shaft 501 , so that the pawl 52 on the first rotating member 53 is disengaged or inserted into the ratchet tooth 512 . As shown in FIG. 9 , the first cam 55 can drive the first shaft 54 to move between the first position and the second position along the second axis; when the first shaft 54 is at the first position, the pawl 52 is disengaged from the ratchet teeth 512 ; as shown in FIG. 10 , when the first shaft 54 is in the second position, the pawl 52 is inserted into the ratchet tooth 512 .

Specifically, as shown in FIGS. 9-11 , the first shaft 54 is provided in the intermediate body 2 , the first end 541 of the first shaft is connected with the first cam 55 , and the second end 542 of the first shaft is connected with the first cam 55 . A rotating member 53 is connected. The first end portion 541 is also provided with a first raised portion 561 connected to the first shaft 54. The first cam 55 can be rotated under the external torque driving, and the rotation of the first cam 55 can drive it and the first raised portion. The relative sliding of 561 makes the first shaft 54 move between the second position and the first position along the second axial direction. The contact surface of the first cam 55 with the first raised portion 561 is designed with an arc, so that when the first cam 55 rotates, the first raised portion 561 can drive the first shaft 54 along the second axial direction in the second position and the second position. move between the first positions.

As shown in FIG. 9 and FIG. 10 , a second groove 531 is formed on the first rotating member 53 , a second convex portion 562 is formed on the second end 542 of the first shaft, and the second convex portion 562 is located in the second concave In the groove 531, during the movement of the first shaft 54 in the second axial direction, the second protrusion 562 on the first shaft 54 drives the first rotating member 53 to rotate around the first pin shaft 501, thereby realizing the insertion of the pawl 52 Or disengage the ratchet 512. Further, as shown in FIG. 12 , the end of the first cam 55 opposite to the first shaft 54 is provided with a third groove 551 to allow the first shaft 54 to pass through the third groove 551 to connect with the first protrusion 561 , The first protruding portion 561 cannot pass through the third groove 551 in the second axial direction, so that the driving effect of the first cam 55 on the first shaft 54 is realized.

As shown in FIG. 8 and FIG. 13 , the ratchet wheel 51 is installed in the first groove 22 provided in the center of the intermediate body 2 , and a support pad 23 is provided between the ratchet wheel 51 and the intermediate body 2 , and the support pad 23 is made of anti-friction material. In this way, the resistance when the ratchet 51 and the intermediate body 2 rotate relative to each other is reduced. At the same time, a hollow cover plate 24 is provided on the end surface of the first groove 22 for restricting the axial movement of the ratchet wheel 51 .

The first cam can be externally connected to the driving device to realize switching of the state of the relief device, and through the cooperation of the driving device and the pressure sensor, the switching between the unlocked state and the locked state can be associated with the pressure of the medium in the parking cylinder cavity. Specifically, the driving device applies external torque to drive the first shaft to travel from the second position to the first position, so that the pawl is disengaged from the ratchet, so that the relief device is switched from the locked state to the unlocked state; when the pressure reaches the rated pressure, The driving device applies external torque to drive the first shaft to travel from the second position to the first position, and then drives the pawl to insert into the ratchet, so that the release device is switched from the unlocked state to the locked state.

Optionally, as shown in FIGS. 9-12 , the first cam 55 is connected to the relief assembly 57 , and the relief assembly 57 includes: a lever 571 connected with the first cam 55 , and a slider 572 rotatably connected with the lever 571 , the first cam 55 is driven to rotate by the movement of the slider 572 , so as to realize the state switching of the relief device 5 . The movement of the slide can be manually operated or by a drive connected to the slide.

Further, as shown in FIGS. 14-15 , the mitigation device 5 further includes a housing 504 fixed on the intermediate body 2 , the housing 504 has a accommodating chamber 505 , and the first end 541 of the first shaft extends from the intermediate body 2 . Out of the accommodating chamber 505 , the first protruding portion 561 , the first cam 55 , and the relief assembly 57 are installed in the accommodating chamber 505 , and the first cam 55 is rotatably connected to the housing 504 through the second pin 502 , the housing 504 is provided with a second chute 506 perpendicular to the first shaft 54 for the slider 572 to slide.

Specifically, as shown in FIG. 14 and FIG. 15 , the first cam 55 is fixedly connected with a sliding rod 554 perpendicular to the second pin shaft 502 , and the lever 571 has a sleeve 573 into which the sliding rod 554 extends. The lever 571 is rotatably connected to the slider 572 through a third pin 503 parallel to the second pin 502, and the slider 572 can move in a direction perpendicular to the second axial direction, thereby driving the lever 571 around the third pin The shaft 503 rotates, and at the same time drives the first cam 55 to rotate around the second pin 502, and because the distance between the second pin 502 and the third pin 503 increases, the sliding rod 554 further extends from the sleeve 573 of the lever 571 .

Preferably, as shown in FIGS. 14-15 , the relief device 5 further includes a first spring seat 581 sleeved outside the first shaft 54 and fixedly connected to the first shaft 54 ; sleeved outside the first shaft 54 and fixed on the The limit seat 582 on the intermediate body 2; and the first return spring 59 sleeved on the outside of the first shaft 54; one end of the first return spring 59 is pressed against the first spring seat 581, and the other end is pressed against the limit seat 582 catch;

The first cam 55 is inserted between the limiting seat 582 and the first protruding portion 561 , and the first cam 55 has a first curved surface 552 slidably connected with the first protruding portion 561 ;

The rotation of the first cam 55 can drive the first shaft 54 to move from the second position to the first position along the second axis, while the limit seat 582 and the first spring seat 581 compress the first return spring 59; the first shaft 54 can It returns to the second position from the first position under the action of the elastic restoring force of the first return spring 59 . The elastic restoring force of the first return spring 59 can be used as the power for the release device 5 to switch from the unlocked state to the locked state. In the absence of external force, when the external force that drives the first cam to rotate is unloaded, the elastic restoration of the first return spring 59 The force may cause the first shaft 54 to return from the first position to the second position.

As an alternative to the above embodiment, as shown in FIGS. 16-17 , the relief device 5 further includes a first spring seat 581 sleeved on the outside of the first shaft 54 and fixedly connected with the first shaft 54 ; The second spring seat 583 outside 54; the first return spring 59 sleeved on the outside of the first shaft 54, one end of which is crimped with the first spring seat 581, and the other end is fixedly connected with the second spring seat 583;

The first cam 55 is inserted between the first protruding portion 561 and the second spring seat 583 . the second curved surface 553;

The rotation of the first cam 55 can drive the first shaft 54 to move from the second position to the first position along the second axis, while the second curved surface 553 keeps the second spring seat 583 in the original position or is further close to the first spring seat 581, Thus, the first return spring 59 is compressed; the first shaft 54 can return to the second position from the first position under the action of the elastic restoring force of the first return spring 59 .

Optionally, as shown in FIGS. 18 and 19 , the first shaft 54 has a thin shaft 543 and a thick shaft 544, and the outer diameter of the thin shaft 543 is smaller than the outer diameter of the thick shaft 544;

The first rotating member 53 is connected to the thick shaft 544;

The end of the thin shaft 543, that is, the first end 541, is connected to the first cam 55; the end of the thick shaft 544, that is, the second end 542, is connected to the first rotating member 53;

The first return spring 59 is restricted from moving between the thick shaft 544 and the first cam 55 . The end of the thick shaft 544 connected with the thin shaft 543 protrudes from the outer circumference of the thin shaft 543, which can limit the first spring seat 581. The first spring seat 581 is blocked by the end of the thick shaft 544, so it is not necessary to connect with the first shaft 54. Fixed connection.

Specifically, as shown in FIG. 12 , the first protrusion 561 is a cylindrical protrusion, and the first curved surface 552 of the first cam and the side surface of the cylindrical protrusion form a cam pair. The first curved surface 552 can be designed such that when the first cam 55 rotates clockwise around the second pin shaft 502, the side surface of the cylindrical protrusion slides relatively with the first curved surface 552, and the first shaft 54 moves from the second position along the second axial direction. Moving to the first position, at the same time, the first return spring 59 is compressed. After the torque loaded on the first cam 55 is unloaded, the compressed first return spring 59 can drive the first shaft 54 from the first position back to the second position.

In order to realize: when the relief device 5 is in the unlocked state, if the pressure of the parking cylinder chamber 10 reaches the rated pressure, the relief device 5 can be automatically switched from the unlocked state to the locked state; if the pressure in the parking cylinder chamber is less than the rated pressure, the relief device 5 remains in the unlocked state 9-12, 14-19, the mitigation device 5 further includes a locking pin 60 installed in the intermediate body 2 and perpendicular to the first axis 54, the locking pin 60 including a first part 601 and a second part connected 602, the outer diameter of the first part 601 is smaller than the outer diameter of the second part 602, and the first part end 6011 protrudes from the intermediate body 2 to the relief position;

The first part 601 is sleeved with a second return spring 603, one end of the second return spring 603 is fixedly connected with the first part 601, and the other end is in contact with the intermediate body 2; the first shaft 54 is provided with a fourth groove 545;

When the first shaft 54 is in the second position, the second return spring 603 is in a compressed state; when the first shaft 54 travels to the first position, the second portion 602 is just opposite to the fourth groove 545, and the second portion 602 can The fourth groove 545 is embedded under the action of the second return spring 603 .

As shown in FIGS. 14-19 , two channels are respectively opened in the intermediate body 2 that match the outer contour of the first shaft 54 and the outer contour of the locking pin 60 for the locking pin 60 and the first shaft 54 to be installed, and the channels allow the locking pin to be installed. 60 and the first shaft 54 move in the direction of their own axes. The two channels are in clearance fit with the first shaft 54 and the locking pin 60 respectively, allowing the first shaft 54 and the locking pin 60 to move in the channels along their respective axial directions. The movement to the direction is more stable. When the first shaft 54 moves to the first position driven by the first cam 55 , the fourth groove 545 is just opposite to the second part 602 , and the second part 602 can enter under the action of the elastic restoring force of the second return spring 603 In the fourth groove 545, the movement of the first shaft 54 in the second axial direction is thus restricted, the rebound of the first return spring 59 is restricted, and the relief device 5 remains in the unlocked state; when the parking piston 11 moves to the relief position The locking pin 60 can be pushed to move into the intermediate body 2, so as to push the second part 602 out of the fourth groove 545, and at the same time, further compress the second return spring 603, thereby releasing the movement of the first shaft 54 in the second axial direction The first shaft 54 travels to the second position again under the action of the elastic restoring force of the first return spring 59, so that the relief device 5 enters the locked state. The release device 5 can be switched from the locked state to the released state under the rotational driving of the first cam 55. When the first cam 55 drives the first shaft 54 to move to the first position, the second part 602 of the locking pin 60 can enter the fourth recess again. The groove 545 keeps the relief device 5 in a relief state unless the parking cylinder chamber 10 is filled with a medium not lower than the rated pressure again.

As shown in Figures 1, 2, 9 and 18, when the parking brake cylinder is in the fully relieved state, the first shaft 54 is in the first position, the first return spring 59 is compressed, and the locking pin second portion 602 is in the second return The spring 603 is inserted into the fourth groove 545, the movement of the first shaft 54 in the second axial direction is restricted, the pawl 52 remains disengaged from the ratchet tooth 512, the relief device 5 is in an unlocked state, the parking screw 13 and the parking nut 12 Can be screwed in or out.

As shown in FIG. 7 , for the parking brake cylinder in the fully relieved state, the medium charged into the parking cylinder cavity 10 is less than the rated pressure, the parking brake cylinder enters the semi-inflated relieved state, and the parking piston 11 cannot travel to the relieved position to push the locking pin 60 so that the second part 602 is ejected from the fourth groove 545, the movement of the first shaft 54 in the second axial direction is still restricted, the relief device 5 remains unlocked, and the parking screw 13 and the parking nut 12 can be screwed in and out. Can be rotated out.

As shown in Figures 3, 4, 10 and 19, for the parking brake cylinder in the fully relieved state, the parking cylinder cavity 10 is charged with a medium not lower than the rated pressure, the parking brake cylinder enters the charging and relieving state, and the parking piston 11 travels To the relief position, the locking pin 60 is pushed, so that the second part 602 is ejected from the fourth groove 545, the second return spring 603 is further compressed, and the first return spring 59 is released to push the first shaft 54 to advance to the first In two positions, the pawl 52 is inserted into the ratchet tooth 512 , the relief device 5 is switched to the locked state, the length of the parking screw 13 and the parking nut 12 is the maximum, and the parking screw 13 cannot be unscrewed out of the parking nut 12 .

As shown in Figures 5 and 6, for the parking brake cylinder in the inflated relief state, the medium in the parking cylinder cavity 10 is discharged, the parking brake cylinder enters the parking brake state, the relief device 5 remains locked, and the parking screw 13 follows the parking. The nut 12 moves close to the parking cylinder 1 under the action of the first elastic element group 4, unless the first cam 55 drives the first shaft 54 to move from the second position to the first position again, so that the pawl 52 is disengaged from the ratchet tooth 512, and the parking screw 13 to unscrew the parking nut 12.

Under normal operating conditions, the first shaft 54 is generally in the second position, and the parking brake cylinder will only move the first shaft 54 from the first shaft 54 to the second position when it is necessary to isolate the parking cylinder surrounded by the parking cylinder and the intermediate body under special conditions. The second position is moved to the first position, and when the first shaft 54 is in the first position, if the medium filled in the parking cylinder cavity 10 is less than the rated pressure, the parking brake cylinder 100 is kept in a fully relieved state. The relief device 5 is set so that when the parking cylinder cavity 10 is filled with a certain medium to make the parking piston 11 move to the relief position, the relief device 5 can be switched from the unlocked state to the locked state, that is to say, the parking brake cylinder provided by this embodiment The 100 has a complete mitigation state retention function to prevent vehicle damage caused by accidental application of parking brake force under special operating conditions.

One end of the parking screw 13 can be screwed with the parking nut 12 , and the other end is sleeved with a force transmission device 6 . Specifically, as shown in FIG. 9 and FIG. 20 , the force transmission device 6 includes a support ring 61 fixedly connected with the parking screw 13;

A force transmission ring 62 is also provided on the opposite side of the support ring 61 and the parking piston 11 . The force transmission ring 62 is installed with a symmetrically arranged force transmission sleeve 63 , and the force transmission sleeve 63 penetrates the intermediate body along the axial direction of the force transmission ring 62 . 2. The inner wall of the force transmission sleeve 63 is provided with a stopper 64;

The force transmission sleeve 63 is provided with a force transmission rod 65 , the first end 651 of the force transmission rod 65 is connected with the brake piston 32 , the second end 652 of the force transmission rod 65 is connected with the limiting member 66 , the inner diameter of the stopper 64 is It is smaller than the outer diameter of the stopper 66 , and the stopper 66 is located on the side of the stopper 64 close to the parking cylinder 1 , so the stopper 64 restricts the stopper 66 to a position where the stopper 64 is close to the parking cylinder 1 . Movement on one side.

Specifically, as shown in FIG. 9 , lugs 621 are symmetrically arranged on the outer side of the force transmission ring 62 , the force transmission sleeve 63 penetrates through the lugs 621 and is fixedly connected to the lugs 621 , and the second elastic element group 7 is disposed between the parking piston 11 and the lug 621 . between the lugs 621.

Optionally, as shown in FIG. 20 , a stepped hole 631 is provided in the force transmission sleeve 63, the step of the stepped hole 631 is the stopper 64, and the large hole 6311 of the stepped hole is located close to the small hole 6312 of the stepped hole relative to the small hole 6312 of the stepped hole. One side of the piston 11; the outer diameter of the stopper 66 is larger than the diameter of the small hole 6312 of the stepped hole and smaller than the diameter of the large hole 6311 of the stepped hole.

The number of the force transmission sleeves 63 is at least two and arranged symmetrically along the circumference of the force transmission ring 62 , and the force transmission sleeves 63 and the intermediate body 2 can slide relative to each other.

When the parking brake cylinder 100 is in a fully relieved state, as shown in FIG. 1 , the force transmission device 6 is in the second state, that is, when the parking piston 11 is in contact with the parking cylinder block 1 , and the brake piston 32 is in contact with the brake cylinder block 3 at the same time. When in contact, the first elastic element group 4 transmits the inelastic restoring force to the force transmission device 6, and the stopper 64 and the limiter 66 are just separated along the axial direction of the force transmission sleeve 63, and the force transmission sleeve 63 and the force transmission rod are just separated. There is also no axial force transmission between 65 , so there is no axial force transmission between the force transmission device 6 and the brake piston 32 . When the parking brake cylinder 100 is in the semi-inflated relief state, the elastic restoring force of the first elastic element group 4 is balanced with the pressure of the medium in the parking cylinder cavity 10 , therefore, the first elastic element group 4 does not transmit the elastic restoring force to the force transmission The position of the ring 62, the force transmission sleeve 63 and the force transmission ring 62 remains unchanged relative to the position in the fully relieved state, and there is still no axial force transmission between the force transmission sleeve 63 and the force transmission ring 62, so the force transmission No axial force is transmitted between the device 6 and the brake piston 32 . As shown in FIG. 3 , when the inflation is relieved, the elastic restoring force of the first elastic element group 4 is still balanced with the pressure of the medium in the parking cylinder cavity 10 , therefore, there is still no gap between the force transmission sleeve 63 and the force transmission ring 62 . In the transmission of the axial force, there is no transmission of the axial force between the force transmission device 6 and the brake piston 32 . In the parking braking state, as shown in FIG. 5 , the parking piston 11 drives the parking nut 12 to move closer to the parking cylinder 1 under the action of the elastic restoring force of the first elastic element group 4 , and the parking screw 13 is locked due to the relief device 5 The state cannot be unscrewed from the parking nut 12. The parking screw 13 moves together with the parking nut 12 and approaches the parking cylinder 1. The parking screw 13 transmits the elastic restoring force to the force transmission ring 62, the force transmission ring 62 and the force transmission sleeve. Driven by the parking screw 13, 63 also moves close to the parking cylinder 1, and the force transmission rod 65 is blocked by the stopper 66 and receives the axial pulling force of the force transmission sleeve 63, so that the brake piston connected to the transmission rod 65 is blocked. 32 Generates parking braking force.

In addition, as shown in FIG. 5 , during the process of the parking screw 13 and the parking nut 12 moving close to the parking cylinder 1, the second elastic element group 7 is kept in a compressed state, and due to the distance between the parking piston 11 and the force transmission ring 62 Remaining unchanged, the degree of compression of the second elastic element group 7 remains unchanged relative to the inflated relief state, once the relief device 5 is switched from the locked state to the unlocked state, thereby allowing the parking screw 13 to move about its axis in the opposite direction to the first direction. Under the action of the elastic restoring force of the second elastic element group 7, the parking screw 13 will be unscrewed from the parking nut 12 and return to the state where the length of the two is the shortest, and the parking piston 11 will also return to the parking The position where the cylinder block 1 is in contact, so that the parking brake cylinder 100 is returned to the fully relieved state. The parking brake cylinder 100 in the parking brake state can switch the release device 5 from the locked state to the unlocked state, that is, the first cam 55 drives the first shaft 54 to travel from the second position to the first position, so as to realize the parking brake. Switch from braking state to fully relieved state. When the mitigation device 5 is set so that the mitigation device 5 can enter the locked state again only when the parking cylinder cavity 10 is filled with a medium not lower than the rated pressure, then the parking brake cylinder 100 provided in this embodiment is switched from the fully relieved state to In the parking brake state, the parking cylinder cavity 10 must be filled with a medium of rated value first, that is, the parking brake cylinder 100 must be in the semi-inflated relief state before switching to the parking brake state.

Specifically, as shown in FIG. 8 , a thrust bearing 67 is further provided between the support ring 61 and the force transmission ring 62 . The thrust bearing 67 helps reduce the friction between the support ring 61 and the force transmission ring 62, thereby reducing the resistance of the force transmission ring to the rotation of the parking screw, improving the mechanical transmission efficiency, and also improving the durability of the support ring.

As shown in FIG. 8 , the parking nut 12 and the parking piston 11 are connected by a first thread 15, and the rotation direction of the first thread 15 is the same as the first direction, so that the screwing in and out of the parking screw 13 and the parking nut 12 do not affect the The stable connection of the parking nut 12 to the parking piston 11 . Of course, the parking piston 11 and the parking nut 12 may also be integrally formed structures. The parking screw 13 and the support ring 61 are connected by a second thread 68, and the rotation direction of the second thread 68 is the same as the first direction, so that the screwing in and out of the parking screw 13 and the parking nut 12 will not affect the parking screw 13 and the Stable connection of the support ring 61 . Of course, the parking screw 13 and the support ring 61 may also be an integrally formed structure.

As shown in FIG. 21a, the parking cylinder 1 has a first bottom 101, and a first side wall 102 disposed around the first bottom 101 and connected to the first bottom. The first bottom 101 has a first air hole 103, and the first air hole 103 It is used to charge and discharge the medium for the parking cylinder cavity 10 .

As shown in FIG. 21b, the brake cylinder block 3 has a second bottom 301, and a second side wall 302 arranged around the second bottom 301 and connected to the second bottom 301. The second bottom 302 has a second air hole 303, the second The air hole 303 is used to charge and discharge the medium for the parking cylinder cavity 30 .

As shown in Fig. 13 and Fig. 21a, a first through hole 211 is formed inside the tubular boss 21, and a second through hole 104 is defined on the first bottom 101 of the parking cylinder corresponding to the position of the tubular boss 21; The first through hole 211 and the second through hole 104 extend therethrough and are connected to a brake applying device (eg, disc brake, tread brake, etc.).

As shown in FIG. 1 , the first bottom 101 of the parking cylinder 1 and the tubular boss 21 are connected by a first sealing ring 105 in a static sealing manner, and the parking piston 11 and the first side wall 102 of the parking cylinder 1 are connected by a first sealing ring 105 . The two sealing rings 106 are connected by dynamic sealing, and the parking piston 11 and the tubular boss 21 are connected by dynamic sealing through the third sealing ring 107 . The brake piston 32 and the second side wall 302 of the brake cylinder block 3 are connected in a dynamic sealing manner through a fourth sealing ring 304.

The first sealing ring 105 may be an O-shaped sealing ring, or a Y-shaped sealing ring, a U-shaped sealing ring, a rectangular sealing ring, etc., which can realize a sealing structure or component. The second sealing ring 106 may be a K-shaped sealing ring, or may be an O-shaped sealing ring, a Y-shaped sealing ring, a U-shaped sealing ring, or other structures or components capable of realizing dynamic sealing. The third sealing ring 107 may be a K-shaped sealing ring, or an O-shaped sealing ring, a Y-shaped sealing ring, a U-shaped sealing ring, or other structures or components that can realize dynamic sealing. The fourth sealing ring 304 may be a K-shaped sealing ring, or may be an O-shaped sealing ring, a Y-shaped sealing ring, a U-shaped sealing ring, or other structures or components that can realize dynamic sealing.

As shown in FIG. 1 , in the first through hole 211 , a clearance adjustment device is also sleeved outside the brake screw 31 , the clearance adjustment device is cooperatively connected with the brake piston 32 , and the clearance adjustment device is connected with the brake screw 31 .

Specifically, as shown in FIG. 1 , the clearance adjustment device includes: a first adjustment nut 81 , the first adjustment nut 81 is sleeved on the outside of the brake screw 13 , and the first adjustment nut 81 is connected to the The brake screw 13 is connected; the thrust tube 82 is fixedly connected to the first adjusting nut 81; the connecting seat 83 is detachably connected to the thrust tube 82 and the brake Between the pistons 31 ; wherein, the thrust output from the brake piston 31 is sequentially transmitted to the brake screw 31 through the connecting seat 83 , the thrust tube 82 and the first adjusting nut 81 .

Optionally, as shown in FIGS. 5 and 6 , the brake piston 32 is connected to the connecting seat 83 through the lever system 9, and the thrust of the brake piston 32 is amplified by the lever system 9 and then output to the brake screw 31. Therefore, Parking brake cylinders deliver greater braking force than conventional parking brake cylinders.

As shown in FIG. 13 and FIG. 22 , a plurality of symmetrically arranged first pockets 111 are provided on the parking piston 11 along the circumferential direction, and a second pocket 25 is provided on the intermediate body 2 corresponding to the first pockets 111 , The first elastic element group 4 is installed between the first recess 111 and the second recess 25 , so as to realize the guiding and positioning of the first elastic element group 4 . As shown in FIG. 2 , the parking piston 11 is provided with a guide column 112 , and a guide hole 26 is provided on the intermediate body 2 corresponding to the guide column. The cooperation between the guide post 112 and the guide hole 26 can limit the relative rotation of the parking piston 11 and the intermediate body 2 .

As shown in FIG. 22 , the number of the first elastic element groups 4 is not less than two, and they are arranged axially symmetrically along the axial direction of the parking brake cylinder 100 . The springs are formed in parallel, so that more elastic potential energy can be stored in a limited space, and a greater parking braking force can be output.

The application also provides a brake caliper unit, the brake caliper unit is installed on the bogie frame of the rail transit vehicle, the brake disc is tightly held by the brake pad, and the train is moved by the friction between the brake pad and the brake disc. The kinetic energy is converted into heat dissipation to achieve the effect of deceleration or parking. As shown in FIG. 23 , the brake caliper unit includes the above-mentioned parking brake cylinder 100 , and also includes a caliper composition 200 connected to the parking brake cylinder 100 ;

The clamp consists of two booms 300, and the booms 300 are used to connect with the bogie;

The pad holder 400 connected with the boom 300, and the pad holder 500 are used to install the brake pads;

Clamp arm 500 connected to brake pad holder 400;

The parking brake cylinder 100 is hinged to the caliper arm 400 through the connecting bolt 600 , and the parking brake caliper unit is flexibly connected to the bogie through the rubber node 700 .

Claims (15)

1. A parking brake cylinder is characterized in that it comprises a parking cylinder body, an intermediate body, and a braking cylinder body, the middle part of the intermediate body has a tubular boss penetrating the parking cylinder body, and a brake is arranged through the tubular boss. moving screw;

   Outside the tubular boss, between the parking cylinder and the intermediate body, a parking piston is sleeved, the parking piston and the parking cylinder form an air-tight parking cylinder cavity, and the parking piston and the A first elastic element group is arranged between the intermediate bodies; a brake piston connected to the brake screw is arranged between the intermediate body and the brake cylinder, and the brake piston is connected to the brake cylinder. The moving cylinder body forms an airtight brake cylinder cavity;

   A parking nut connected to the parking piston is sleeved on the outside of the tubular boss; a parking screw is sleeved outside the tubular boss, and the parking screw and the parking nut have matching trapezoidal threads ;

   A relief device connected to the parking screw is installed on the intermediate body. When the relief device is in an unlocked state, the parking screw and the parking nut can be unscrewed. When the relief device is in a locked state When the parking screw and the parking nut cannot be unscrewed;

   A force transmission device is provided outside the parking screw, the force transmission device is connected with the brake piston, and a second elastic element group is arranged between the force transmission device and the parking piston. When the device is in the first state, there is an axial force transmission between the parking screw and the brake piston, and when the force transmission device is in the second state, the parking screw and the brake piston are in contact with each other. There is no axial force transmission between;

   When the pressure in the parking cylinder cavity is zero and the parking piston is in contact with the parking cylinder, the relief device is in an unlocked state, and the force transmission device is in a second state; when the parking cylinder cavity is filled with When the medium is not lower than the rated pressure, the relief device is switched from the unlocked state to the locked state, and the force transmission device maintains the second state; when the relief device is in the locked state, the medium in the parking cylinder cavity is Expelling, the force transmission device can be switched from the second state to the first state, and the brake piston moves close to the intermediate body driven by the force transmission device.
2. The parking brake cylinder according to claim 1, wherein the parking brake cylinder has:

   A complete relief state, in which the pressure in the parking cylinder cavity is zero, the parking piston is in contact with the parking cylinder, the relief device is in an unlocked state, and the force transmission device is in a second state, The length of the parking screw and the parking nut is the shortest;

   In the fully relieved state, the parking cylinder cavity is filled with a medium with a pressure not lower than the rated pressure, and the parking brake cylinder enters the inflated relief state; in the inflated relief state, the parking piston travels to the relief position, so The relief device is switched to the locked state, the force transmission device remains in the second state, the first elastic element group and the second elastic element group are compressed, and the length of the parking screw and the parking nut is the longest. long;

   In the charging relief state, the pressure medium in the parking cylinder cavity can be discharged to make the parking brake cylinder enter the parking braking state; The lead screw and the parking nut keep the longest screwing length, and the elastic restoring force of the first elastic element group makes the parking piston drive the parking nut, and then drive the parking screw along its axial direction, that is, the first In an axial direction, close to the parking cylinder, the force transmission device is switched to the first state.
3. The parking brake cylinder of claim 2, wherein the parking brake cylinder has a semi-inflated relief state;

   In the fully relieved state, filling the parking cylinder cavity with a medium less than the rated pressure can make the parking brake cylinder enter the semi-inflated relieved state; in the semi-inflated relieved state, the parking piston does not travel to the relieved state position, the relief device remains in the unlocked state, and the force transmission device remains in the second state.
4. The parking brake cylinder according to claim 1, wherein the relief device comprises: a ratchet wheel, a pawl engaged with the ratchet wheel, and a pawl connected to the ratchet wheel to control the ratchet wheel and the pawl A release mechanism for positional relationship; the inner wall of the parking screw is provided with an axially extending first chute, and the ratchet has a guide rod slidably connected with the first chute;

   The relief mechanism enables the pawl to be inserted into the ratchet wheel, thereby restricting the parking screw from rotating out of the parking nut, and the relief device is in a locked state; the relief mechanism enables the pawl to disengage from the ratchet wheel, Then, the restriction on the parking screw from being rotated out of the parking nut is released, and the relief device is in an unlocked state.
5. The parking brake cylinder according to claim 4, wherein the outer circumference of the ratchet wheel is provided with ratchet teeth arranged at a certain angle, and the relief mechanism comprises:

   A first rotating member rotatably connected to the intermediate body through a first pin shaft, a first shaft connected to the first rotating member, and a first shaft that can drive the first shaft along its axis direction, that is, the second axial direction , the moving first cam; the pawl is arranged on the first rotating member;

   The movement of the first shaft can drive the first rotating member to rotate around the first pin shaft, so that the pawl on the first rotating member can be disengaged or inserted into the ratchet tooth.
6. The parking brake cylinder according to claim 5, wherein the first cam can drive the first shaft to move between the first position and the second position along the second axial direction; When the first shaft is in the first position, the pawl is disengaged from the ratchet teeth; when the first shaft is in the second position, the pawl is inserted into the ratchet teeth.
7. 6. The parking brake cylinder of claim 6, wherein the first shaft is provided in the intermediate body, and a first end of the first shaft is connected to the first cam, the the second end of the first shaft is connected with the first rotating member;

   The first end is also provided with a first protruding portion connected to the first shaft, and the rotation of the first cam can drive the relative sliding of the first cam and the first protruding portion, thereby enabling the first cam to slide relative to the first protruding portion. A shaft moves between the second position and the first position along the second axis.
8. The parking brake cylinder according to claim 7, wherein the relief device further comprises a first spring seat sleeved on the outside of the first shaft and fixedly connected with the first shaft; a limit seat fixed on the intermediate body outside the first shaft; and a first return spring sleeved on the outside of the first shaft; one end of the first return spring is pressed against the first spring seat connected, and the other end is crimped with the limit seat;

   the first cam is inserted between the limiting seat and the first protruding portion, and the first cam has a first curved surface slidably connected with the first protruding portion;

   The rotation of the first cam can drive the first shaft to move from the second position to the first position along the second axis, while the limit seat and the first spring seat compress the first reset a spring; the first shaft can return to the second position from the first position under the action of the elastic restoring force of the first return spring.
9. The parking brake cylinder according to claim 7, wherein the relief device further comprises a first spring seat sleeved on the outside of the first shaft and fixedly connected with the first shaft; a second spring seat outside the first shaft; a first return spring sleeved on the outside of the first shaft, one end of which is crimped with the first spring seat, and the other end is fixedly connected with the second spring seat;

   The first cam is inserted between the first protruding portion and the second spring seat, the first cam has a first curved surface slidably connected with the first protruding portion, and the second The second curved surface of the spring seat crimping;

   The rotation of the first cam can drive the first shaft to move from the second position to the first position along the second axis, while the second curved surface keeps the second spring seat in its original position. position or closer to the first spring seat, so that the first return spring is compressed; the first shaft can return to the desired position from the first position under the action of the elastic restoring force of the first return spring the second position.
10. The parking brake cylinder according to claim 7, wherein the first shaft has a thin shaft and a thick shaft, the outer diameter of the thin shaft is smaller than the outer diameter of the thick shaft; the first rotating member connected to the thick shaft;

    The end of the thin shaft, that is, the first end, is connected to the first cam; the end of the thick shaft, that is, the second end, is connected to the first rotating member;

    The first return spring is restricted from moving between the thick shaft and the first cam.
11. 8. The parking brake cylinder of claim 7, wherein the relief device further comprises a locking pin mounted in the intermediate body and perpendicular to the first axis, the locking pin comprising a connected first shaft a portion and a second portion, the outer diameter of the first portion being smaller than the outer diameter of the second portion, and the end portion of the first portion extending from the intermediate body to the relief location;

    A second return spring is sleeved outside the first part, the second return spring is in a compressed state, one end of the second return spring is fixedly connected with the first part, and the other end is in contact with the intermediate body; A fourth groove is opened on one shaft;

    When the first shaft is in the second position, the second return spring is in a compressed state; when the first shaft travels to the first position, the second portion is just in contact with the fourth concave The grooves are opposite to each other, and the second part can be inserted into the fourth groove under the action of the second return spring.
12. The parking brake cylinder according to claim 1, wherein the force transmission device comprises a support ring fixedly connected with the parking screw;

    A force transmission ring is also provided on the opposite side of the support ring and the parking piston, the force transmission ring is installed with a symmetrically arranged force transmission sleeve, and the force transmission sleeve is along the axial direction of the force transmission ring. Passing through the intermediate body, the inner wall of the force transmission sleeve is provided with a stopper;

    The power transmission sleeve is provided with a power transmission rod, the first end of the power transmission rod is connected with the brake piston, the second end of the power transmission rod is connected with a limiting member, and the stop part The inner diameter is smaller than the outer diameter of the limiting piece, and the limiting piece is located on the side of the stopper portion close to the parking cylinder.
13. The parking brake cylinder according to claim 12, wherein a lug is symmetrically arranged on the outside of the force transmission ring, the force transmission sleeve penetrates through the lug and is fixedly connected with the lug, and the The second elastic element group is arranged between the parking piston and the lug.
14. The parking brake cylinder according to claim 12, wherein a stepped hole is formed in the force transmission sleeve, and the step of the stepped hole is the stop part; the large hole of the stepped hole is opposite to The small hole of the step hole is located on the side close to the parking piston; the outer diameter of the stopper is larger than the diameter of the small hole and smaller than the diameter of the large hole, and the stopper is limited by the step movement in the large hole.
15. A brake caliper unit, comprising a caliper composition, characterized in that it further comprises the parking brake cylinder according to any one of claims 1-14, wherein the caliper composition includes two booms, and the The arm is used to connect with the bogie;

    a brake pad holder connected with the boom, the brake pad holder is used to install the brake pad;

    a clamp arm connected with the brake pad holder;

    The parking brake cylinder is hinged to the clamp arm through a connecting bolt;

    The parking brake caliper unit is flexibly connected to the bogie through rubber nodes.

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