Unit brake

Abstract

The left side face and the right side face of the unit brake are each provided with a manual relieving device with the completely same structure, the manual relieving devices on the two sides can be switched between the two working states of a working position and a failure position, only one side of the two sides plays a role, and the other side of the two sides needs to be placed in the failure position to be out of action. The manual relieving device comprises a pull rod, a pin sleeve, a ratchet wheel stop pin and the like, the pin sleeve is integrally fixed with the machine body through threads, and the ratchet wheel stop pin can slide along an inner hole of the machine body; cylindrical short pins and positioning pins are assembled in holes in the head parts of the inner and outer sides of the pull rod; cylinders inside and outside the pull rod can respectively slide inwards and outwards along the ratchet wheel stop pin and the central hole of the pin sleeve; and a locking spring and a restoring spring are respectively assembled on the inside and outside sides of a shaft shoulder of the pull rod. The manual release device on a certain side can be selected to be located at a working position or a failure position through simple manual operation, so that the left model and the right model of the brake are unified and can be installed in an interchangeable mode.

Description

Technical Field

[0001] The utility model belongs to the field of unit brakes. Background Art

[0002] Subway engineering vehicles use a large number of locomotive unit brakes (hereinafter referred to as brakes) that integrate automatic brake adjusters and parking brake mechanisms. The parking brake mechanism uses the pressure released by the parking brake spring to prevent the vehicle from slipping when it is stationary, similar to the handbrake of a car.

[0003] When the vehicle is operating normally, the brake is charged with total air to compress the parking brake spring, so that the parking brake is in a released state, which does not affect the normal operation of the vehicle. When the subway vehicle is towed without total air, the manual release device must be used to release the parking brake.

[0004] The manual release device of the brake is generally set on the outer side of the brake to facilitate the operator to approach and operate under the vehicle. Therefore, the brake is divided into left and right models according to the setting position of the manual release device. Apart from this, the rest of the brake parts are the same.

[0005] Due to the precision of the internal structure of the brake, the site of use does not have the ability to dismantle and repair it. When the brake fails, in order to ensure the normal use of the vehicle, it is generally handled by directly replacing the brake, so the unit needs to reserve the corresponding left and right models of brakes. The inventor found that due to the high price of the unit brake, different models of brakes have an adverse effect on the emergency treatment and spare parts storage of vehicle factories and subway users, increasing the inventory cost and management pressure of the corresponding units. With the continuous advancement of refined management, it is urgent to improve the standardization from a technical perspective and reduce the variety. Summary of the invention

[0006] The utility model aims to overcome the above-mentioned shortcomings of the prior art and provide a unit brake with a manual release device, so as to realize manual release of parking brakes on both sides and make the left and right brakes unified.

[0007] The technical solution of the utility model is: a unit brake, including a body and a ratchet, a parking brake screw, a keyway nut sleeve, and a parking brake spring arranged in a parking cavity of the body; and also includes two sets of manual relief devices for locking / unlocking the ratchet symmetrically arranged on the left and right sides of the body.

[0008] The manual release device includes a pin sleeve connected to the machine body, a ratchet stop pin for locking / unlocking the ratchet, a locking spring and a return spring for pushing the ratchet stop pin to engage with the ratchet so that the manual release device is in the working position, and a pull rod for driving the ratchet stop pin to disengage from the ratchet so that the manual release device is in the failure position; the pin sleeve is provided with a working position slot / failure position slot that cooperates with the pull rod to control the ratchet stop pin so that the manual release device remains in the working position / failure position.

[0009] When in use, one and only one of the two manual release devices is in the working position.

[0010] The rear end of the ratchet stop pin is provided with a center hole for cooperating with the pull rod; the inner end of the pull rod is inserted into the center hole and connected to the ratchet stop pin via a cylindrical short pin; the ratchet stop pin is provided with a circumference slot hole for cooperating with the cylindrical short pin to limit the position.

[0011] A shaft shoulder is arranged in the middle of the pull rod, and a circular step which cooperates with the shaft shoulder of the pull rod and limits the position is arranged on the machine body.

[0012] The locking spring is sleeved on the pull rod on the inner side of the shaft shoulder.

[0013] The outer end of the locking spring abuts against the shaft shoulder, and the inner end abuts against the rear end of the ratchet stop pin.

[0014] The restoring spring is sleeved on the pull rod outside the shaft shoulder.

[0015] The inner end of the restoring spring abuts against the shaft shoulder, and the outer end abuts against the inner end of the pin sleeve.

[0016] The rear end of the pull rod is radially provided with a positioning pin for cooperating with the working position groove / failure position groove on the pin sleeve.

[0017] The working slot has a depth greater than the failure slot.

[0018] The pin sleeve is fixed to the machine body as a whole via threads.

[0019] The utility model provides an identical set of parking brake manual release devices on both sides of the brake, and the manual release device on each side adds a failure position on the basis of the working position. The manual release device on a certain side can be selected to be in the working position or the failure position through simple manual operation, so that the left and right models of the brake are unified and can be installed interchangeably. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a structural diagram of the manual relief device part (working position).

[0022] Figure 3 yes Figure 2A-direction view.

[0023] Figure 4 yes Figure 2 C-direction view of the pin sleeve part.

[0024] Figure 5 It is a structural diagram of the manual relief device part (failure position).

[0025] Figure 6 yes Figure 5 B view.

[0026] In the figure: pull rod 1, shaft shoulder 101, restoring spring 2, positioning pin 3, pin sleeve 4, working position slot 401, failure position slot 402, locking spring 5, cylindrical short pin 6, ratchet stop pin 7 、 Center hole 701, circumference slot hole 702, machine body 8, circular step 801, ratchet 9, parking brake screw 10, nut sleeve locking spring 11, parking brake spring 12, parking brake spring 13, keyway nut sleeve 14, parking chamber piston 15, brake chamber piston 16. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below according to the embodiments provided in the accompanying drawings.

[0028] The utility model provides a unit brake, wherein a set of manual release devices with completely the same structure are respectively arranged on the left and right sides of the tread unit brake, and the release device can realize parking brake release by operating the unit brake on either side of the vehicle.

[0029] See also Figure 1-Figure 6 The manual relief device includes a pull rod 1, a pin sleeve 4, a ratchet stop pin 7, etc. The pin sleeve 4 is fixed to the body 8 by a thread, and the ratchet stop pin 7 can slide along the inner hole of the body 8; the inner and outer ends of the pull rod 1 are opened with holes to be equipped with cylindrical short pins 6 and positioning pins 3 (cylindrical pins). A shoulder 101 is provided in the middle of the pull rod 1, and a circular step 801 is provided on the body 8 to limit the position of the pull rod shoulder 101. The inner and outer cylinders of the pull rod 1 can slide inward and outward along the center hole 701 of the ratchet stop pin 7 and the center hole of the pin sleeve 4 respectively. The inner and outer sides of the shoulder 101 of the pull rod 1 are respectively equipped with a locking spring 5 and a return spring 2.

[0030] The manual release devices on both sides can be switched between two working states: working position and failure position. Only one side can work, and the other side must be placed in the failure position to make it lose its function.

[0031] To avoid mutual interference, if both sides are in a failed state or working state at the same time, the parking brake function of the unit brake will not be able to brake or release.

[0032] For ease of use, it is recommended to set the manual release mechanism on the outside of the track to the working state and the manual release mechanism on the inside of the track to the locked and disabled state.

[0033] There are four semicircular grooves distributed along the circumference of the outer end of the pin sleeve 4. The depths of the two relative grooves are consistent, and there is a certain difference in the depths of the two adjacent grooves. From the inside to the outside, they are the working position groove 401 (waist-shaped groove) and the failure position groove 402 (step semicircular groove), which correspond to the working position and failure position of the manual relief device respectively.

[0034] The inner cylindrical part of the pull rod 1 can slide in the central hole 701 of the ratchet stop pin 7, and the cylindrical short pin 6 assembled on the inner cylindrical head of the pull rod 1 can slide along the circumferential long slot hole 702 opened on the circumference of the ratchet stop pin 7 by the pull rod 1.

[0035] A restoring spring 2 is installed on the outside of the middle shoulder of the pull rod 1, and the outside of the restoring spring 2 is fixed by the pin sleeve 4. The spring force of the restoring spring 2 acts on the shoulder of the pull rod 1, causing the pull rod 1 to move inward until the inner side of the shoulder of the pull rod 1 is blocked by the circular step of the machine body 8. At this time, the outer locating pin 3 of the pull rod 1 falls on the semicircular groove of the circumferential step at the outer end of the pin sleeve 4, which is the working position of the manual relief device.

[0036] The outer side of the locking spring 5 is the middle shoulder of the pull rod 1, and the inner side is the outer end face of the ratchet stop pin 7. When the manual relief device is in the working position, the force released by the locking spring 5 causes the ratchet stop pin 7 to move inward along the inner hole of the body 8 and the inner cylinder of the pull rod 1 until the ratchet stop pin 7 engages with the ratchet teeth of the ratchet 9, at which time the outermost end of the circumferential slot hole of the ratchet stop pin 7 contacts the cylindrical short pin 6.

[0037] The pull rod 1 is at the innermost side, and the outer positioning pin 3 is in the two relatively deep grooves of the pin sleeve 4, i.e., the waist-shaped groove, and the manual release device on this side is in the working position. Under the action of the restoring spring 2, the pull rod 1 moves inward until the pull rod shoulder falls on the circular step of the body 8; at the same time, the spring force of the locking spring 5 makes the ratchet stop pin 7 move inward until the cylindrical short pin 6 on the inner side contacts the outermost end of the circumference slot of the ratchet stop pin 7. At this time, the ratchet stop pin 7 and the ratchet 9 are meshed with ratchet teeth, so that the ratchet 9 is locked and cannot rotate clockwise. The parking brake screw 10 and the ratchet 9 are fixed together by threads through the keyway nut sleeve 14. At this time, if the nut sleeve locking spring 11, the parking brake spring 12, and the parking brake spring 13 are released, the parking spring force is transmitted to the lower brake chamber piston 16 through the parking brake chamber piston 15, the keyway nut sleeve 14, the ratchet 9, and the parking brake screw 10, and the parking brake action occurs.

[0038] On the contrary, the positioning pin 3 assembled on the outer head of the pull rod 1 is pulled by a special tool, driving the pull rod 1 to move outward to overcome the spring force of the restoring spring 2. After the pull rod 1 is pulled outward by force for about 10 mm, it is rotated 90° clockwise (counterclockwise) and released, so that the cylindrical pin falls into the two shallower opposite notches of the pin sleeve 4, namely the stepped semicircular groove. This is the failure position or manual relief position of the manual relief device. In this process, the cylindrical short pin 6 on the inner head drives the ratchet stop pin 7 to disengage from the ratchet teeth of the ratchet 9 through the circumferential slot of the ratchet stop pin 7, so that the ratchet 9 is unlocked. The ratchet 9 and the keyway nut sleeve 14 that are released from the rotation restriction rotate clockwise under the force of the nut sleeve locking spring 11, driving the parking brake screw 10 to move upward until it contacts the top of the cylinder body; at the same time, under the force of the parking brake spring 12, the parking brake spring 13, etc., the parking brake chamber piston 15 moves downward to the bottom of the brake cylinder. At this time, although the parking brake springs 12 and 13 are fully released, the parking brake screw 10 is completely retracted, and the parking spring force cannot be transmitted to the lower brake chamber piston 16, and the manual release of the parking brake action is completed.

[0039] When the manual release devices on both sides of the unit brake are in the working position, the locating pins 3 of the pull rods 1 on both sides are in the two relatively deep grooves of the pin sleeve 4, namely the waist-shaped grooves, and the ratchet stop pins 7 on both sides are engaged with the ratchet teeth of the ratchet 9, so that the ratchet 9 is locked and cannot rotate clockwise, and the parking brake screw 10 is fixed together with the ratchet 9. This is the working position of the manual release device. When the parking brake springs 12 and 13 are released, the parking brake screw 10 transmits the parking spring force to the lower brake piston 16, and the parking brake can function normally.

[0040] When the manual release devices on both sides of the unit brake are in the failure position, the pull rods 1 on both sides are in the two shallow opposite grooves of the pin sleeve 4, namely the stepped semicircular grooves, and the ratchet stop pin 7 is disengaged from the ratchet teeth of the ratchet 9, so that the ratchet 9 is unlocked and the manual release of the parking brake is completed.

[0041] When the manual release device on the inner side of the unit brake is in the failure position, the locating pin 3 of the side pull rod 1 is in the shallow step semicircular groove of the pin sleeve 4, and the side ratchet stop pin 7 is disengaged from the ratchet teeth of the ratchet 9, so that the ratchet 9 is released from the locked state. At this time, the working state of the unit brake is determined by the position of the manual release device on the outer side, that is, when the manual release device on the outer side is in the working position, the parking brake can function normally; when the manual release device on the outer side is in the failure position, the manual release of the parking brake is completed.

[0042] Similarly, when the manual release device on the outside of the unit brake is in the failure position, the positioning pin 3 of the side pull rod 1 is in the shallow step semicircular groove of the pin sleeve 4, and the side ratchet stop pin 7 is disengaged from the ratchet teeth of the ratchet 9, so that the ratchet 9 is released from the locked state. At this time, the working state of the unit brake is determined by the position of the manual release device on the inside.

[0043] Manual relief mechanism failure position and working position conversion method:

[0044] (1) The working position is changed to the disabled position; the manual release device in the working position hooks the two sides of the outer cylinder of the positioning pin 3, and then pulls it outward with force. After pulling it out about 10 mm, the handle is rotated 90° clockwise (counterclockwise) and then released, so that the cylindrical pin falls into the semicircular groove of the step, and the manual release device is in the disabled position.

[0045] (2) The failure position is changed to the working position. When the manual release device is in the failure position, use the matching special tool to hook the two sides of the outer cylinder of the positioning pin 3, and then pull it outward with force. Turn the handle 90° clockwise (counterclockwise) and then release it, so that the cylindrical pin falls into the waist-shaped groove, and the manual release device enters the working position.

[0046] The unit brake of the utility model effectively realizes manual release of the unit brake that can be operated on both sides of the vehicle. The utility model has a simple structure, and a set of manual release devices are arranged on both sides of the left and right sides. The corresponding functions are realized by optimizing and improving the pin sleeve structure. The parts are simple, easy to purchase and manufacture, low cost, and easy to maintain.

[0047] The description in conjunction with the above drawings is only a description of one embodiment of the present invention, and does not limit the technical solution of the present invention thereto. Any known deformation made by technical personnel in the field of rail vehicles based on the main technical concept of the present invention belongs to the technical scope to be protected by the present invention.

Claims

1. A unit brake, comprising a body (8), a ratchet (9), a parking brake screw (10), a keyway nut sleeve (14), and a parking brake spring arranged in a parking cavity of the body (8); characterized in that: It also includes two sets of manual release devices for locking / unlocking the ratchet (9) which are symmetrically arranged on the left and right sides of the machine body (8); The manual release device comprises a pin sleeve (4) connected to the body (8), a ratchet stop pin (7) for locking / unlocking the ratchet (9), a locking spring (5) and a return spring (2) for pushing the ratchet stop pin (7) to engage with the ratchet (9) so that the manual release device is in a working position, and a pull rod (1) for driving the ratchet stop pin (7) to disengage from the ratchet (9) so that the manual release device is in a failure position; the pin sleeve (4) is provided with a working position slot / failure position slot that cooperates with the pull rod (1) to control the ratchet stop pin (7) so that the manual release device is kept in the working position / failure position; When in use, one and only one of the two manual release devices is in the working position.

2. The unit brake according to claim 1, characterized in that: The rear end of the ratchet stop pin (7) is provided with a center hole (701) for cooperating with the pull rod (1); the inner end of the pull rod (1) is inserted into the center hole (701) and connected to the ratchet stop pin (7) via a cylindrical short pin (6); the ratchet stop pin (7) is provided with a circumferential slot hole (702) for cooperating with the cylindrical short pin (6) for limiting position.

3. The unit brake according to claim 1, characterized in that: The pull rod (1) is provided with a shaft shoulder (101) in the middle, and the machine body (8) is provided with a circular step (801) that cooperates with the pull rod shaft shoulder (101) to limit the position.

4. The unit brake according to claim 3, characterized in that: The locking spring (5) is sleeved on the pull rod (1) on the inner side of the shaft shoulder (101).

5. The unit brake according to claim 4, characterized in that: The outer end of the locking spring (5) abuts against the shaft shoulder (101), and the inner end abuts against the rear end of the ratchet stop pin (7).

6. The unit brake according to claim 3, characterized in that: The restoring spring (2) is sleeved on the pull rod (1) outside the shaft shoulder (101).

7. The unit brake according to claim 6, characterized in that: The inner end of the restoring spring (2) abuts against the shaft shoulder (101), and the outer end abuts against the inner end of the pin sleeve (4).

8. The unit brake according to claim 1, characterized in that: The rear end of the pull rod (1) is provided with a positioning pin (3) in the radial direction for cooperating with a working position slot / a failure position slot on the pin sleeve (4).

9. The unit brake according to claim 1, characterized in that: The working slot (401) has a slot depth greater than the failure slot (402).

10. The unit brake according to claim 1, characterized in that: The pin sleeve (4) is fixed to the machine body (8) via threads.

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