Manual release device for parking brake of rail locomotive vehicle

Abstract

The utility model discloses a manual release device for parking braking of a rail locomotive vehicle, and aims to overcome the defect that the manual release device for parking braking is failed due to the fact that a sliding block is easily blocked by a manual release device for braking adopting a sliding block-guide rod structure. The pawl and the ratchet wheel are arranged in an offset mode, the pull rod is used for controlling the pawl to rotate, the pawl is connected in the relieving box in a hinged mode and can abut against the ratchet wheel, the ratchet wheel and a non-self-locking screw rod which is in transmission connection with a brake shoe to move are coaxially arranged and are in transmission connection, the pawl comprises a pawl body and a pawl handle, and the pull rod is connected with a sliding rod. The sliding rod is inserted into a guide sleeve of the relieving box and is in sliding connection with the guide sleeve, a check block is arranged at the end of the sliding rod, a movable groove is formed in the check block, and the claw handle extends into the movable groove. The claw handle is contacted in the mode that the movable groove is formed in the check block on the pull rod, so that the pull rod only bears axial tension, and the situation that in an original structure, due to the fact that the sliding block bears eccentric torsional moment from the claw handle, the sliding block is easily pulled or clamped on the guide rod in the resetting process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of train braking, and more specifically, it relates to a manual release device for parking brakes on rail locomotives and rolling stock. Background Technology

[0002] Rail vehicles are generally equipped with parking brakes. When a rail vehicle stops, the parking brake is applied to prevent it from rolling backwards. Under normal operating conditions, the parking brake can be released via an electro-pneumatic system when needed. However, in cases of power failure, compressed air shortages, or electrical control malfunctions, the parking brake must be released manually.

[0003] Existing parking brake manual release devices are similar Figure 1 The schematic diagram shows a ratchet and pawl structure for braking control, with the ratchet and non-self-locking screw coaxially connected. When the pawl hooks onto the ratchet teeth, the ratchet's locking mechanism restricts the rotation of the non-self-locking screw, thus keeping the train in a parking brake state. When the pawl disengages from the ratchet, the spring force causes the non-self-locking screw to rotate, the screw retracts, and the parking brake is released.

[0004] Continue to refer to Figure 1 The pawl's shank abuts against the slider (labeled 20), which is then mounted on the guide rod (labeled 4). When the slider is pulled, it causes the pawl shank to rotate. Due to the torsional torque from the eccentric pawl shank, the slider is prone to getting stuck on the guide rod when it is pulled or reset, especially when using double pull ropes. This prevents the pawl hook from disengaging from the ratchet or keeps it in a disengaged state, making it impossible to release or apply the parking brake, thus affecting the safety of the train parking. Utility Model Content

[0005] This invention overcomes the shortcomings of manual parking brake release devices with slider-guide rod structures, which are prone to failure due to slider jamming. It provides a new type of manual parking brake release device for rail locomotives and vehicles to reduce the probability of manual parking brake release device failure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A manual release device for parking brakes on rail locomotives includes a release box, a ratchet, a pawl offset from the ratchet, and a lever for controlling the rotation of the pawl. The pawl is hinged in the release box and can abut against the ratchet. The ratchet is coaxially and driven by a non-self-locking screw that drives the movement of the brake shoe. The pawl includes a pawl body and a pawl handle. The lever is connected to a slide rod, which is inserted into a guide sleeve of the release box and slidably connected to the guide sleeve. The end of the slide rod is provided with a stop block, and the stop block has a movable groove into which the pawl handle extends.

[0008] The present application adopts a direct driving mode of a pull rod to drive the pawl, thereby releasing or realizing the control of the rotation of the ratchet. The stopper on the slide rod is used for accommodating the pawl handle through the setting of a movable groove. In the rotation process, the force of the pawl handle pressing the movable groove wall is always collinear with the movement direction of the pull rod and opposite to the pulling direction of the pull rod, thereby improving the deficiency that the existing manual relief device is prone to failure.

[0009] As preferred, the surface of the pawl handle is provided with convex points for abutting against the side wall of the movable groove, and the convex points are semispherical. The semicircular convex points are in good contact with the groove wall of the movable groove when the pawl handle is at each rotation angle.

[0010] As preferred, the number of the slide rods is one.

[0011] As preferred, the number of the slide rods is two, and the two slide rods are arranged in parallel. The structure is especially suitable for the case of multiple pull rods.

[0012] As preferred, a limiting rod fixedly connected to the relief box is further included, a limiting groove adapted to the limiting rod is arranged on the pawl, and the limiting rod can move axially. When the limiting groove is blocked by the limiting rod, the pawl cannot press on the ratchet. When the limiting rod moves and the limiting groove cannot block the limiting rod, the pawl can press on the ratchet. The structure limits the pawl and limits the rotation angle of the pawl.

[0013] As preferred, a reset spring is sleeved on the slide rod and abuts between the stopper and the guide sleeve.

[0014] As preferred, the pawl is hingedly connected to the relief box, a torsional spring is arranged on the relief box, and one end of the torsional spring presses on the pawl. The structure realizes the rotation connection of the pawl and the relief box.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] (1) The pawl handle is directly pulled through the setting of the movable groove on the pull rod, so that the pull rod only bears the axial pulling force and avoids the deflection moment when the pawl handle is pulled through the slide block;

[0017] (2) The transmission mode of the pull rod-movable groove and the pawl handle supports the setting of multiple slide rods through the parallel arrangement mode, and adapts to the arrangement form of the multiple pull rods of the manual relief device of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the existing parking brake manual relief device;

[0019] Figure 2 is a schematic view of the present application;

[0020] Figure 3 is a schematic diagram of another pull rod pulling to realize parking brake relief of the utility model;

[0021] Figure 4 is a schematic diagram of another pull rod pulling to realize parking brake relief of the utility model;

[0022] In the drawing:

[0023] Relief box 1, ratchet 2, pawl 3, pull rod 5, claw body 6, claw handle 7, sliding rod 8, guide sleeve 9, stop block 10, movable slot 11, limiting slot 12, limiting rod 13, return spring 14, convex point 15, torsional spring 16. DETAILED DESCRIPTION

[0024] The present disclosure will be further described below in conjunction with the drawings and embodiments.

[0025] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains.

[0026] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0027] In the present disclosure, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present disclosure, and is not intended to specify any component or element in the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0028] In the present disclosure, the terms such as "fixedly connected", "connected", "connected" should be understood broadly, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant researchers or technicians in the art, the specific meaning of the above terms in the present disclosure can be determined according to the specific circumstances, and cannot be understood as a limitation of the present disclosure.

[0029] Embodiment:

[0030] A track vehicle parking brake manual relief device, as shown in Figures 2 to 4As shown, the device comprises a relief box 1, a ratchet wheel 2, a pawl 3 arranged in bias with the ratchet wheel 2, and a pull rod 5 for controlling the rotation of the pawl 3, the pawl 3 is connected in the relief box 1 and can abut on the ratchet wheel 2, the ratchet wheel 2 is coaxially arranged with and in transmission connection with a non-self-locking screw rod for moving brake shoes, the pawl 3 comprises a pawl body 6 and a pawl handle 7, the pull rod 5 is connected with a sliding rod 8, the sliding rod 8 is inserted in and in sliding connection with a guide sleeve 9 of the relief box 1, an end of the sliding rod 8 is provided with a stop block 10, the stop block 10 is provided with a movable slot 11, the pawl handle 7 extends into the movable slot 11.

[0031] The surface of the pawl handle 7 is provided with a convex point 15 for abutting against the side wall of the movable slot 11, the convex point 15 is in a semispherical shape. The semicircular convex point 15 is in good contact with the slot wall of the movable slot 11 when the pawl handle 7 is at each rotation angle.

[0032] The device further comprises a limiting rod 13 fixedly connected with the relief box 1, the pawl 3 is provided with a limiting slot 12 adapted to the limiting rod 13, when the limiting slot is blocked by the limiting rod, the pawl cannot press on the ratchet wheel, when the limiting rod moves and the limiting slot cannot block the limiting rod, the pawl can press on the ratchet wheel. The structure limits the rotation angle of the pawl.

[0033] The sliding rod 8 is sleeved with a reset spring 14, the reset spring 14 abuts between the stop block 10 and the guide sleeve 9. The pawl 3 is hingedly connected with the relief box 1, the relief box 1 is provided with a torsion spring 16, one end of the torsion spring 16 presses on the pawl 3. The hinged connection between the pawl 3 and the relief box 1 is realized through the structure.

[0034] The application adopts a driving mode of directly pulling the pull rod 5 to drive the pawl 3, so as to release or realize the control of the rotation of the ratchet wheel 2. The stop block 10 on the sliding rod 8 is provided with the movable slot 11 for accommodating the pawl handle 7. In the rotation process of the pawl handle 7, the force applied by the pawl handle 7 to the slot wall of the movable slot 11 against the elastic force always collinearly with the movement direction of the pull rod, and opposite to the pulling direction of the pull rod 5, so as to improve the deficiency that the existing manual relief device is easy to be stuck and fail.

[0035] In some embodiments, the number of the sliding rods 8 is one.

[0036] In other embodiments, the number of the sliding rods 8 is two, and the two sliding rods 8 are arranged in parallel. The structure is suitable for the case of multiple pull rods 5. In more embodiments, the number of the sliding rods 8 can be more, and in these embodiments, the length of the pawl handle 7 is adaptively changed, so as to be able to extend into the corresponding movable slots 11 of the sliding rods 8.

[0037] The above-mentioned embodiments are only the preferred schemes of the application, and do not limit the application in any form, and other variants and modifications can be made without exceeding the technical scheme recorded in the claims.

Claims

1. A hand release device for a parking brake of a railway rolling stock, characterized in that, The relief box, the ratchet wheel, the pawl arranged in the ratchet wheel and the pull rod for controlling the rotation of the pawl are included, the pawl is hingedly connected in the relief box and can abut on the ratchet wheel, the ratchet wheel is coaxially arranged with the non-self-locking screw rod for driving the brake shoe to move and is in driving connection, the pawl includes a pawl body and a pawl handle, the pull rod is connected with a sliding rod, the sliding rod is inserted into a guide sleeve of the relief box and is in sliding connection with the guide sleeve, an end of the sliding rod is provided with a stopper, the stopper is provided with a movable slot, and the pawl handle extends into the movable slot.

2. A hand release device for a parking brake of a railway vehicle according to claim 1, characterized in that The surface of the pawl handle is provided with a convex point for abutting against the side wall of the movable slot, and the convex point is in a semispherical shape.

3. A hand release device for a parking brake of a rail vehicle according to claim 2, characterized in that The number of the sliding rods is one.

4. A hand release device for a parking brake of a railway vehicle according to claim 2, characterized in that The number of the sliding rods is two, and the two sliding rods are arranged in parallel.

5. A hand release device for a parking brake of a railway vehicle according to claim 1, characterized in that A limiting rod fixedly connected to the relief box is further included, and the pawl is provided with a limiting slot adapted to the limiting rod.

6. A hand release device for a parking brake of a railway vehicle according to claim 1, characterized in that A reset spring is sleeved on the sliding rod, and the reset spring abuts between the stopper and the guide sleeve.

7. A hand release device for a parking brake of a rail vehicle according to any one of claims 1 to 6, characterized in that The pawl is hingedly connected to the relief box, the relief box is provided with a torsion spring, and one end of the torsion spring is pressed on the pawl.

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