JP2008051145A - Railroad vehicle caliper brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To forcibly release a brake shoe from a disc rotor during replacing work for the brake shoe. <P>SOLUTION: In this railroad vehicle caliper brake device, a free piston 12 stops the flow of operating oil in a cylinder 21 during cancelling braking to adjust a brake clearance between the disc rotor 1 and the brake shoe. The device comprises a bypass line 50 connecting an upstream chamber 15 to a downstream chamber 16, and an opening/closing valve 60 for opening/closing the bypass line 50. The opening/closing valve 60 is manually operated to open the bypass line 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a caliper brake device for a railway vehicle that can forcibly widen a brake clearance between a disc rotor and a control wheel when the control wheel is replaced.

The caliper brake device for railway vehicles is equipped with an adjuster valve that is interposed in the brake hydraulic passage, so that the brake clearance between the disc rotor and the restrictor when the brake is released is automatically adjusted by the adjuster valve even if the lining of the restrictor is worn. Some are adjusted (see Patent Document 1).
Japanese Patent Laid-Open No. 10-110759 JP 2000-179594 A

  However, in such a conventional caliper brake device for a railway vehicle, it is necessary to separate the worn brake wheel from the disk rotor when replacing the brake wheel, but it is attempted to push the hydraulic piston into the brake caliper. However, since the adjuster valve stops the flow of the hydraulic fluid returned from the hydraulic piston through the brake hydraulic pressure passage, there is a problem that the control member cannot be separated from the disk rotor.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a caliper brake device for a railway vehicle that can forcibly separate the control device from the disk rotor when the control device is replaced. To do.

  The present invention relates to a return spring that urges the restrictor in a direction away from the disc rotor, a hydraulic piston that presses the restrictor against the disc rotor, a brake hydraulic passage that guides the hydraulic pressure to the hydraulic piston, and a hydraulic piston when the brake is released An adjuster valve that limits the amount of hydraulic fluid returned from the cylinder, the adjuster valve defining a brake hydraulic pressure passage, a free piston that is slidably interposed in the cylinder and partitions the upstream chamber and the downstream chamber. A caliper brake device for a railway vehicle that adjusts the brake clearance between the disc rotor and the control wheel by stopping the flow of hydraulic oil in the cylinder when the brake is released, and a bypass passage that connects the upstream chamber and the downstream chamber Has an open / close valve that opens and closes this bypass passage, and is operated by manually operating this open / close valve. And it shall be characterized in that a configuration which opens the scan path.

  According to the present invention, when exchanging the brake restrictor, the bypass passage is opened and the hydraulic piston is pulled into the brake caliper, so that the work of separating the restrictor from the disc rotor can be easily performed.

  First, an example of a caliper brake device for a railway vehicle to which the present invention shown in FIG. 3 can be applied will be described.

  In this caliper brake device, a brake pressure-increasing mechanism (not shown) generates a hydraulic pressure corresponding to the brake operation amount, and this hydraulic pressure is guided to the hydraulic piston 7 of the brake caliper 2 via the brake hydraulic pressure passage 10, whereby the hydraulic piston 7 However, the lining 3 of the control 9 is pressed against the disk rotor 1 of the wheel to brake the rotation of the wheel.

  The brake 9 is supported by the brake caliper 2 through a plurality of anchor pins 4 so as to be movable in the axle direction. A return spring 6 is interposed inside each anchor pin 4, and this return spring 6 urges the restrictor 9 in a direction away from the disk rotor 1.

  An adjuster valve 11 is interposed in the brake hydraulic passage 10, and a free piston 12 is slidably inserted in a housing 20 of the adjuster valve 11. The free piston 12 limits the return amount of the hydraulic oil in the brake hydraulic passage 10, so that the brake clearance between the disc rotor 1 and the lining 3 of the brake control 9 is automatically adjusted. Hereinafter, the gap between the lining 3 of the control wheel 9 and the disc rotor 1 is referred to as a brake gap.

  The operation of the adjuster valve 11 will be described based on (a), (b), (c), and (d) of FIG. In the figure, hatched portions indicate the hydraulic oil interposed in the adjuster valve 11.

  In the initial state and when the brake is released, as shown in FIG. 3A, the free piston 12 of the adjuster valve 11 is moved in the arrow B direction, and the hydraulic piston 7 is applied to the brake caliper 2 by the urging force of the return spring 6. The disc rotor 1 is held so that the brake clearance with the lining 3 of the control wheel 9 becomes a predetermined value.

  During normal operation of the brake, as shown in FIG. 3B, the hydraulic pressure introduced from the brake hydraulic pressure passage 10 increases, so that the free piston 12 of the adjuster valve 11 moves in the direction of arrow A, and the housing 20 of the adjuster valve 11 The hydraulic piston 7 is pushed out from the brake caliper 2 by the hydraulic oil pushed out from the inside, and presses the brake member 9 against the disc rotor 1.

  As the wear amount of the lining 3 increases, the operating stroke of the free piston 12 gradually increases. When the wear amount of the lining 3 eventually exceeds a predetermined value, as shown in FIG. The free piston 12 moves and comes into a bottomed state in contact with the downstream cap 14 and passes through the annular gap 22 defined between the seal ring 19 of the free piston 12 and the housing 20 to reduce the amount of lining wear. The amount of oil is additionally supplied, and the hydraulic piston 7 is pushed out from the brake caliper 2 by this hydraulic oil, and the control member 9 is pressed against the disc rotor 1.

  Thereafter, when the brake is released, as shown in FIGS. 3D and 3A, the free piston 12 of the adjuster valve 11 comes into contact with the upstream cap 13 after the movement, and the hydraulic oil By stopping the flow of the hydraulic fluid, the hydraulic oil corresponding to the required amount of oil is returned from the hydraulic piston 7 into the housing 20, and the hydraulic oil corresponding to the amount of wear of the lining 3 is left in the hydraulic piston 7. The brake clearance with the lining 3 of the control 9 is automatically adjusted.

  By the way, it is necessary to separate the worn restrictor from the disc rotor 1 when exchanging the restrictor. However, even if the hydraulic piston 7 is pushed into the brake caliper 2, the adjuster valve 11 is connected from the hydraulic piston 7 to the brake hydraulic passage. In order to stop the flow of the hydraulic oil returned through 10, there has been a problem that the control member cannot be separated from the disk rotor 1.

  The present invention provides a caliper brake device for a railway vehicle that can forcibly separate the control member from the disc rotor when the control device is replaced.

  The embodiment of the present invention shown in FIG. 1 will be described below with reference to specific examples.

  A cylinder 21 is formed in the housing 20 of the adjuster valve 11, and a free piston 12 is slidably accommodated in the cylinder 21. The cylinder 21 is partitioned into an upstream chamber 15 and a downstream chamber 16 by the free piston 12. The upstream chamber 15 communicates with the brake pressure increasing mechanism of the vehicle via a pipe (not shown), and the downstream chamber 16 communicates with each hydraulic piston 7 of the opposed brake caliper 2 via the brake hydraulic passages 10 and 10 '. A downstream cap 14 is fastened to one end of the housing 20.

  A seal ring 19 is interposed on the outer peripheral portion of the free piston 12, and the seal ring 19 is in sliding contact with the cylinder 21 to seal between the upstream chamber 15 and the downstream chamber 16.

  An end of the cylinder 21 is formed with a downstream recess 23 that is annularly recessed. When the seal ring 19 of the free piston 12 comes to a position facing the downstream recess 23, the hydraulic oil is in contact with the free piston 12 and the downstream recess. The free piston 12 flows around an annular gap defined between the two and the free piston 12.

  The adjuster valve 11 moves until the free piston 12 comes into contact with the downstream cap 14 during braking when the lining 3 is worn, and the seal ring 19 faces the downstream recess 23 to define an annular gap. The hydraulic oil in the upstream chamber 15 flows to the downstream chamber 16 through this annular gap.

  The adjuster valve 11 includes a bypass passage 50 that bypasses the free piston 12 and guides hydraulic oil, and an open / close valve 60 that opens and closes the bypass passage 50. The open / close valve 60 is manually operated to open the bypass passage 50. The configuration.

  The on-off valve 60 includes a pilot cylinder 51 that defines a bypass passage 50, a pilot piston 52 that is slidably accommodated in the pilot cylinder 51, and the pilot piston 52 in the upstream direction of the pilot cylinder 51 (left direction in the figure). ) Is provided with a pilot recess 54 opposed to the outer peripheral portion of the pilot piston 52 when sliding over a predetermined stroke, and the bypass passage 50 is opened through the pilot recess 54.

  The housing 20 is formed with a pilot cylinder 51, a through hole 68 connecting the downstream chamber 16 and the pilot cylinder 51, and a through hole 69 connecting the pilot cylinder 51 and the upstream side of the upstream chamber 15 of the brake hydraulic passage 10. By these, the bypass passage 50 is defined.

  A pair of seal rings 56, 57 are interposed on the outer periphery of the pilot piston 52, and an annular recess 58 is formed between the seal rings 56, 57.

  The hydraulic pressure in the upstream chamber 15 is guided to one end of the pilot piston 52, and atmospheric pressure is guided to the other end of the pilot piston 52.

  As shown in FIG. 1, in the closed position where the pilot piston 52 abuts the retaining ring 66, the opening end of the through hole 68 is sandwiched between the seal rings 56 and 57, and the brake hydraulic passage 10 is closed. Is done.

  When the pilot piston 52 moves from the closed position shown in FIG. 1 to the open position in a direction upstream of the pilot cylinder 51 (leftward in the figure) beyond a predetermined stroke, the seal ring 57 is disengaged from the pilot cylinder 51 and enters the pilot recess 54. The bypass passage 50 is opened through the pilot recess 54 and the annular recess 58 of the pilot piston 52.

  As shown in FIG. 2, a rubber cap 71 is interposed in the opening of the pilot cylinder 51. A cross-shaped cut 72 is formed in the cap 71, and the pilot piston 52 is pushed in by a tool inserted from the cut 72.

  At the time of exchanging the brake restrictor, an unillustrated tool is inserted from the notch 72 of the cap 71 and the pilot piston 52 is pushed, so that the seal ring 57 of the pilot piston 52 is detached from the pilot cylinder 51 and faces the pilot recess 54. The bypass passage 50 is opened through the pilot recess 54. As a result, as the hydraulic oil bypasses the free piston 12 and flows through the bypass passage 50, the hydraulic piston 7 is drawn into the brake caliper 2 by the urging force of the return spring 6, and the lining 3 of the disc rotor 1 and the brake element 9. The brake clearance with is enlarged.

  When the brake is operated after the work for exchanging the brake restrictor is completed, the hydraulic pressure guided from the brake hydraulic pressure passage 10 increases, so that the pilot piston 52 moves in the downstream direction (right direction in the figure) of the pilot cylinder 51 to bypass the bypass passage. 50, while the free piston 12 of the adjuster valve 11 moves in the downstream direction (rightward in the figure) of the cylinder 21, the hydraulic piston 7 is moved from the brake caliper 2 by the hydraulic oil pushed out from the housing 20 of the adjuster valve 11. It is pushed out and presses the control wheel 9 against the disc rotor 1.

  In the present embodiment, a return spring 6 that urges the restrictor away from the disk rotor 1, a hydraulic piston 7 that presses the restrictor against the disk rotor 1, and a brake hydraulic passage 10 that guides the hydraulic pressure to the hydraulic piston 7. And an adjuster valve 11 that restricts the amount of hydraulic oil returned from the hydraulic piston 7 when the brake is released. The adjuster valve 11 includes a cylinder 21 that defines a brake hydraulic passage 10 and a slidable support for the cylinder 21. The free piston 12 that is mounted to partition the upstream chamber 15 and the downstream chamber 16 is provided, and when the brake is released, the free piston 12 stops the flow of the hydraulic oil in the cylinder 21 to adjust the brake clearance between the disc rotor 1 and the control wheel. In the vehicle brake device, the bypass passage 50 connecting the upstream chamber 15 and the downstream chamber 16 and the bypass passage are provided. Since the opening / closing valve 60 for opening and closing the valve 50 is provided and the opening / closing valve 60 is manually operated to open the bypass passage 50, the bypass passage 50 is opened and the hydraulic piston 7 is braked when the control is replaced. By pulling into the caliper 2, the work of separating the control member from the disc rotor 1 can be easily performed.

  In the present embodiment, the opening / closing valve 60 is formed on a pilot cylinder 51 that defines the bypass passage 50, a pilot piston 52 that is slidably accommodated in the pilot cylinder 51, and an outer peripheral portion of the pilot piston 52. An annular recess 58, and a pilot recess 54 that faces the annular recess 58 of the pilot piston 52 when the pilot piston 52 moves in the upstream direction of the pilot cylinder 51. The pilot piston 52 is pushed into the pilot cylinder 51 by pushing the pilot piston 52 into the pilot cylinder 51. Since the bypass passage 50 is opened through a gap defined between the annular recess 58 and the pilot recess 54, the bypass passage 50 is easily opened by pushing the pilot piston 52.

  In the present embodiment, the on-off valve 60 is piloted by the operating hydraulic pressure of the upstream chamber 15 being guided to one end of the pilot piston 52 and the atmospheric pressure being guided to the other end of the pilot piston 52 and the operating hydraulic pressure of the upstream chamber 15 being increased. Since the piston 52 automatically moves to the closed position where the bypass passage 50 is closed, the operation of closing the on-off valve 60 is not necessary.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

Sectional drawing of the adjuster valve which shows embodiment of this invention. The front view of an adjuster valve. Sectional drawing which shows the operating state of the brake device with which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc rotor 2 Brake caliper 3 Lining 4 Anchor pin 6 Return spring 7 Hydraulic piston 10 Brake hydraulic passage 11 Adjuster valve 12 Free piston 15 Upstream chamber 16 Downstream chamber 19 Seal ring 21 Cylinder 50 Bypass passage 60 Opening / closing valve 51 Pilot cylinder 52 Pilot piston 54 Pilot recess

Claims (3)

A return spring that urges the restrictor away from the disc rotor, a hydraulic piston that presses the restrictor against the disc rotor, a brake hydraulic passage that guides the hydraulic pressure to the hydraulic piston, and a return from the hydraulic piston when the brake is released An adjuster valve for limiting the amount of hydraulic oil, and the adjuster valve includes a cylinder that defines the brake hydraulic pressure passage, and a free piston that is slidably interposed in the cylinder and partitions the upstream chamber and the downstream chamber. In the caliper brake device for railway vehicles, the free piston stops the flow of hydraulic oil in the cylinder when the brake is released, thereby adjusting a brake clearance between the disc rotor and the control wheel.
A railway vehicle comprising a bypass passage connecting the upstream chamber and the downstream chamber and an opening / closing valve for opening / closing the bypass passage, and the opening / closing valve is manually operated to open the bypass passage. Caliper brake device.   The open / close valve includes a pilot cylinder that defines the bypass passage, a pilot piston that is slidably received in the pilot cylinder, an annular recess formed in an outer peripheral portion of the pilot piston, and the pilot piston A pilot recess facing the annular recess of the pilot piston when moved in the upstream direction of the pilot cylinder, and the bypass passage is formed through a gap defined between the annular recess of the pilot piston and the pilot recess. The caliper brake device for a railway vehicle according to claim 1, wherein the caliper brake device is opened.   The open / close valve is configured such that the working oil pressure of the upstream chamber is led to one end of the pilot piston, the atmospheric pressure is led to the other end of the pilot piston, and the working oil pressure of the upstream chamber is increased so that the pilot piston is bypassed. The caliper brake device for a railway vehicle according to claim 2, wherein the caliper brake device is automatically moved to a closed position for closing the passage.