JP6225063B2 - Caliper brake device - Google Patents

Description

  The present invention relates to a caliper brake device that applies frictional force to a brake disk that rotates with a wheel to brake the rotation of the wheel.

  2. Description of the Related Art Conventionally, caliper brake devices that perform braking by using fluid pressure such as hydraulic pressure or air pressure have been used for vehicles such as railway vehicles. Patent Document 1 discloses a caliper brake device in which a disk that rotates together with a wheel is sandwiched between a pair of restrictors, and the rotation of the wheel is braked by a frictional force between the disk and the restrictor. In the caliper brake device, when the amount of wear of the braking device accompanying braking reaches a certain level, it is replaced with a new braking device.

  The caliper brake device of Patent Document 1 is provided with a clearance adjustment mechanism that adjusts the clearance between the brake member and the disk to be constant when braking is released. Therefore, the guide plate that supports the restrictor approaches the disk as the restrictor wears.

JP 2013-160299 A

  By the way, in order to remove the worn restrictor and attach a new restrictor, it is necessary to return the guide plate approaching the disk to the initial position by the action of the gap adjusting mechanism. At this time, if the guide plate is forcibly pushed back, a large force may be applied to the mechanism portion of the caliper brake device.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve safety when replacing a brake lining.

  The present invention is a caliper brake device that applies a frictional force across a brake disk that rotates with a wheel, a caliper body that is supported by a carriage, and a brake lining that is capable of applying a frictional force in sliding contact with the brake disk; A guide plate that supports the brake lining and moves forward and backward with respect to the caliper body, and a pressing mechanism that presses the brake lining against the brake disc, and either one of the caliper body or the guide plate is: A protrusion projecting toward the other, wherein one of the caliper body and the guide plate has a contact portion with which the protrusion contacts when the guide plate is retracted; .

  In the present invention, when replacing the brake lining, if the guide plate is moved backward to push back to the initial position, the protrusion and the contact portion come into contact with each other. Therefore, it is possible to prevent a large force from acting on the mechanism portion of the caliper brake device so as to forcefully push back the guide plate. Therefore, the safety when replacing the brake lining can be improved.

It is a top view of the caliper brake device concerning an embodiment of the invention. It is a front view in FIG. FIG. 3 is a view taken in the direction of arrow III in FIG. 1 and shows a state where a second anchor pin and a brake lining are removed. It is IV-IV sectional drawing in FIG. It is an enlarged view of the 1st anchor pin in FIG. It is a top view of the caliper brake device which concerns on the modification of embodiment of this invention.

  Hereinafter, a caliper brake device 100 according to an embodiment of the present invention will be described with reference to the drawings.

  First, the overall configuration of the caliper brake device 100 will be described with reference to FIGS. 1 to 3. The caliper brake device 100 is a floating type, but may be an opposed piston type.

  The caliper brake device 100 is a pneumatic brake for railway vehicles that uses compressed air as a working fluid. The caliper brake device 100 includes a caliper body 10 that is supported by a cart (vehicle body) (not shown) via a support frame 20 and a pair of caliper bodies 10 that can move forward and backward with respect to the caliper body 10 and slidably contact the brake disc 6 to apply a friction force. The brake lining 7, the guide plate 8 that supports the brake lining 7, the pair of anchor pins 43 that support the guide plate 8 so as to be movable forward and backward, and the brake lining 7 are pressed against the brake disc 6 by the pressure of compressed air. A pressing mechanism 50.

  The caliper brake device 100 applies a frictional force with the brake disc 6 that rotates together with the wheels 5 interposed therebetween. Specifically, the caliper brake device 100 holds the brake disk 6 from both sides by a pair of brake linings 7 and brakes the rotation of the wheels 5 by the frictional force between the brake disk 6 and the brake lining 7.

  The brake disc 6 is formed on both the front and back surfaces of the wheel 5 and rotates integrally with the wheel 5. Instead of forming the brake disc 6 integrally with the wheel 5, a separate brake disc 6 that rotates together with the wheel 5 may be provided.

  As shown in FIG. 1, the caliper body 10 includes a first caliper arm 12 and a second caliper arm 14 that extend across the brake disk 6, and a yoke that connects the first caliper arm 12 and the second caliper arm 14. Part 13 and a pair of bracket parts 15 for supporting caliper body 10 on the carriage.

  As shown in FIG. 2, the caliper body 10 is floatingly supported by the upper slide pin 30 and the lower slide pin 32 so as to be slidable with respect to the support frame 20.

  The upper slide pin 30 and the lower slide pin 32 are provided through the support frame 20. Both end portions of the upper slide pin 30 and the lower slide pin 32 are respectively connected to the bracket portion 15 of the caliper body 10. The caliper body 10 is supported by the support frame 20 so that the upper slide pin 30 and the lower slide pin 32 can be relatively moved in the axial direction. As shown in FIG. 1, the exposed portions of the upper slide pin 30 and the lower slide pin 32 are covered with a rubber boot 34 and protected from dust and the like.

  As shown in FIGS. 1 and 3, the caliper body 10 has four protrusions 11 that protrude toward the guide plate 8. The protrusions 11 are provided on the caliper main body 10 so as to face two on both sides of the guide plate 8. In addition, two protrusions 11 are provided on the caliper body 10 on both ends in the longitudinal direction of the guide plate 8.

  When the guide plate 8 is retracted, the protruding portion 11 comes into contact with a contact portion 8c described later of the guide plate 8. Thereby, the projection part 11 regulates the stroke when the guide plate 8 moves backward. The height of the protrusion 11 is formed such that there is a gap between a diaphragm 53 and a caliper cover 54 in a pressing mechanism 50 described later when the protrusion 11 abuts on the abutting portion 8c.

  The protrusion 11 faces the side surface of the guide plate 8 and is formed with a predetermined gap between the protrusion 11 and the side surface of the guide plate 8. The protrusion 11 contacts the side surface of the guide plate 8 when the lower anchor pin 43 of the guide plate 8 is removed and the guide plate 8 is supported by the upper anchor pin 43 and rotates. Thus, the protrusion 11 restricts the rotation of the guide plate 8 relative to the caliper body 10.

  The gap between the projection 11 and the side surface of the guide plate 8 is formed larger than the fit tolerance between the anchor pin 43 and the guide plate 8. Therefore, even when the guide plate 8 moves by the fitting tolerance during braking, the protrusion 11 does not come into contact with the side surface of the guide plate 8. Further, the protrusion 11 is formed such that there is a gap between a diaphragm 53 in a pressing mechanism 50 (described later) and a cylinder body 51a when contacting the side surface of the guide plate 8.

  The protrusion 11 is cast integrally with the caliper body 10. However, the protrusion 11 may be formed separately from the caliper body 10 and fixed to the caliper body 10 by bolting or the like. Moreover, you may form a part or all of the front-end | tip of the projection part 11 with elastic materials, such as rubber | gum. In this case, it is possible to buffer an impact when the guide plate 8 moves backward and the projection 11 comes into contact with the contact portion 8c.

  The brake lining 7 receives a pressing force from the pressing mechanism 50 and is pressed against the brake disc 6 in parallel. The brake lining 7 includes a back plate portion 7 a fixed to the guide plate 8, and a friction member 7 b that contacts the brake disc 6 that rotates together with the wheels 5. The friction member 7b includes a plurality of segments, and is fixed to the surface of the back plate portion 7a. The brake lining 7 brakes the rotation of the wheel 5 by the frictional force generated by the contact between the friction member 7 b and the brake disk 6.

  The guide plate 8 has a dovetail groove 8 a formed along the longitudinal direction and engaged with the back plate portion 7 a of the brake lining 7. Both ends of the guide plate 8 in the longitudinal direction are supported by the caliper body 10 by a pair of anchor pins 43. Of the pair of anchor pins 43, the upper anchor pin 43 that rotatably supports one end of the guide plate 8 on the caliper body 10 corresponds to the first anchor pin, and the lower end that engages the other end of the guide plate 8 with the caliper body 10. The anchor pin 43 corresponds to the second anchor pin. The adjuster 40 having the anchor pin 43 will be described in detail later with reference to FIG.

  As shown in FIGS. 1 and 3, the guide plate 8 has four contact portions 8 c with which the protrusions 11 of the caliper body 10 can contact each other. The contact portion 8c is provided at a position where the tip of the projection 11 faces so that each projection 11 can contact. The contact portion 8c is formed to protrude from the guide plate body 8b to the side. Thereby, the front-end | tip of the projection part 11 can contact | abut to the contact part 8c, and the side surface of the projection part 11 can contact | abut to the guide plate main body 8b.

  Next, the internal structure of the caliper body 10 will be described with reference to FIGS. 4 and 5.

  The caliper main body 10 is provided with a pair of adjusters 40 disposed at both ends in the longitudinal direction and a pressing mechanism 50 disposed between the pair of adjusters 40.

  The adjuster 40 adjusts the initial position of the brake lining 7 with respect to the brake disc 6. The adjusters 40 are fastened to the upper and lower ends of the caliper body 10 by anchor bolts 42, respectively.

  The adjuster 40 includes a lining receiver 41 fixed to the caliper body 10 by an anchor bolt 42, an anchor pin 43 that is provided so as to be movable forward and backward with respect to the lining receiver 41 and supports the brake lining 7 on the caliper body 10, and the brake lining 7. A return spring 44 that urges the brake disc 6 away from the brake disc 6 and a gap adjustment mechanism 45 that adjusts the gap between the brake lining 7 and the brake disc 6 when braking is released are provided.

  The anchor pin 43 is formed in a substantially bottomed cylindrical shape. The anchor pin 43 has a flange portion 43 b that engages with the guide plate 8. The anchor pin 43 is provided with a bottom 43 a protruding from the lining receiver 41, and the flange 43 b is fitted to both ends of the guide plate 8 to support the brake lining 7.

  When the brake lining 7 comes close to the brake disc 6, the anchor pin 43 is pulled out from the lining receiver 41 by the guide plate 8 that is displaced together with the brake lining 7 and is displaced in the axial direction. The anchor pin 43 holds the brake lining 7 against the brake disk 6 attempting to move the brake lining 7 in the circumferential direction by frictional force during braking when the brake lining 7 is in sliding contact with the brake disk 6.

  As shown in FIG. 5, a return spring 44 and a gap adjusting mechanism 45 are accommodated on the inner periphery of the anchor pin 43. The anchor pin 43 has a flat washer 43c on the inner periphery near the opening end. A sliding portion exposed to the outside at the time of sliding in the anchor pin 43 is covered with a rubber boot 47 and protected from dust and the like.

  The return spring 44 is a coil spring that is compressed and interposed on the inner periphery of the anchor pin 43. When the return spring 44 changes from the braking state to the non-braking state, the flange 43b of the anchor pin 43 pushes back the brake lining 7 through the guide plate 8 by the biasing force, and the brake lining 7 is moved from the brake disc 6 to a predetermined level. Separate by distance. Thereby, the distance of the brake lining 7 and the brake disc 6 at the time of brake cancellation | release can be adjusted, and the heat dissipation of the brake disc 6 can be made favorable.

  The clearance adjustment mechanism 45 adjusts the return amount of the brake lining 7 to be constant by the urging force of the return spring 44 when the brake is released. That is, the gap adjusting mechanism 45 always keeps the distance between the brake lining 7 and the brake disc 6 at the time of non-braking. The gap adjusting mechanism 45 includes a fixed pin 45a fixed to the lining receiver 41, a grip 45b provided to be movable in the axial direction with respect to the fixed pin 45a, and a collar 45c movable in the axial direction with respect to the fixed pin 45a. And comprising.

  The grip 45b is movable in the axial direction when the anchor pin 43 advances with the movement of the guide plate 8 during braking, and the flat washer 43c comes into contact with and presses the step 45d of the collar 45c. The grip 45b grips the outer periphery of the fixed pin 45a with a force that cannot move in the axial direction by the urging force of the return spring 44. Therefore, the grip 45b moved in the direction in which the anchor pin 43 advances during braking is not returned by the urging force of the return spring 44 when braking is released, and maintains its position.

  While the wear of the brake lining 7 is small, the stroke amount of the anchor pin 43 during braking is small. Therefore, even if the anchor pin 43 is advanced, the flat washer 43c does not contact the step 45d of the collar 45c. Therefore, when the brake is released, the anchor pin 43 returns to the original position before the braking.

  On the other hand, when wear of the brake lining 7 progresses and the stroke amount of the anchor pin 43 at the time of braking increases, when the anchor pin 43 advances, the flat washer 43c contacts the step portion 45d and presses the collar 45c. . The flat washer 43c is moved by dragging the grip 45b together with the collar 45c. As a result, when the brake is released, the anchor pin 43 returns only to a position where it has advanced by the same amount as the movement amount of the collar 45c.

  Therefore, since the position of the brake lining 7 during non-braking can be advanced by the worn thickness, the distance between the brake lining 7 and the brake disc 6 during non-braking can always be kept constant.

  As shown in FIG. 4, the pressing mechanism 50 includes a cylinder 51 formed in the caliper body 10, a piston 52 that can move forward and backward with respect to the cylinder 51 and press the brake lining 7 via the guide plate 8, and a piston 52. A diaphragm 53 as an elastic membrane that moves the piston 52 by elastically deforming by the pressure of the compressed air in the pressure chamber 55, and a piston 52. A piston plate 58 slidably supported on the anchor pin 43.

  The pressing mechanism 50 deforms the diaphragm 53 by adjusting the air pressure in the pressure chamber 55, and moves the piston 52 forward and backward with respect to the cylinder 51 by the deformation of the diaphragm 53. The pressing mechanism 50 presses the brake lining 7 against the brake disc 6 via the guide plate 8 by retracting the piston 52 from the cylinder 51.

  The cylinder 51 has a caliper cover that defines a pressure chamber 55 by closing the back surface of the cylinder body 51a and fixing the diaphragm 53 between the cylinder body 51a and the cylinder body 51a on the inner periphery of the cylinder body 51a. 54.

  The cylinder body 51a is formed in an elliptical cylindrical shape that surrounds the piston 52 in an annular shape. A dust seal 51b that slides on the outer peripheral surface of the piston 52 and protects it from dust or the like is provided on the inner periphery of the cylinder body 51a.

  The caliper cover 54 is an oval plate material corresponding to the cylinder body 51a. The caliper cover 54 is fixed to the end surface of the cylinder body 51a by a plurality of bolts 54a. The inner surface of the caliper cover 54 constitutes the inner wall of the pressure chamber 55. Note that the caliper cover 54 and the cylinder main body 51a may be formed integrally instead of separately.

  The diaphragm 53 is elastically deformed by the pressure in the pressure chamber 55 and moves the piston 52. The diaphragm 53 has a peripheral portion 53a that forms the outermost periphery, a pressing portion 53c that is formed on the innermost periphery, and a bellows portion 53b that is formed continuously between the peripheral portion 53a and the pressing portion 53c. .

  The peripheral edge 53a is sandwiched and fixed between the cylinder body 51a and the caliper cover 54. At this time, since the peripheral portion 53a plays a role of packing, the airtightness of the pressure chamber 55 is ensured.

  The bellows portion 53 b is located between the inner peripheral surface of the cylinder body 51 a and the outer peripheral surface of the piston 52. The bellows portion 53b extends from the folded state (the state shown in FIG. 4) when the pressure in the pressure chamber 55 increases, and returns to the folded state when the pressure in the pressure chamber 55 decreases. That is, the bellows portion 53 b can be deformed into a folded state and an extended state by the air pressure supplied to the pressure chamber 55.

  The pressing portion 53c is in contact with the piston 52, and is displaced in the retracting direction of the piston 52 by the extension of the folded bellows portion 53b. As the pressing portion 53 c is displaced, the piston 52 is pressed and moves in the cylinder 51.

  The pressure chamber 55 is defined inside the cylinder 51 by a diaphragm 53 and a caliper cover 54. The pressure chamber 55 advances and retracts the piston 52 as its volume expands and contracts. The pressure chamber 55 is provided with a through hole 56 (see FIGS. 1 and 2). Compressed air for deforming the diaphragm 53 during braking is supplied from an external air pressure source through the through hole 56.

  The piston 52 contacts the back surface of the guide plate 8. The piston 52 is held in the cylinder 51 by a diaphragm 53. The piston 52 has a pressing surface 52 a that contacts the guide plate 8 and a back surface 52 b that is formed on the opposite side of the pressing surface 52 a and contacts the diaphragm 53. The piston 52 advances and retreats in the cylinder 51 due to the deformation of the diaphragm 53 that contacts the back surface 52b.

  The piston plate 58 is a plate material provided in parallel with the guide plate 8. The piston plate 58 is displaced together with the piston 52 and moves parallel to the guide plate 8. The piston plate 58 is close to the guide plate 8 when braking, and is separated from the guide plate 8 when braking is released. The piston plate 58 is formed integrally with the piston 52. The piston plate 58 may be formed separately from the piston 52, and the piston 52 may be fixed to the piston plate 58 for use.

  The piston plate 58 has a pair of sliding holes 58a into which the anchor pins 43 are inserted at both ends in the longitudinal direction. The piston plate 58 is engaged with the anchor pin 43 inserted into the sliding hole 58 a and is slidable in the axial direction of the anchor pin 43. The piston plate 58 defines the position of the piston 52 in the cylinder 51 by engaging the slide holes 58 a at both ends with the anchor pin 43.

  Next, the operation of the caliper brake device 100 will be described.

  When the railway vehicle is traveling, the wheels 5 are rotating at high speed. Here, when the caliper brake device 100 is switched to the braking state by the driver's operation or the like, the compressed air supplied from the air pressure source is sent into the pressure chamber 55 through the through hole 56 to deform the diaphragm 53. . Then, the bellows portion 53b of the diaphragm 53 extends, and the pressing portion 53c slides the piston 52 in the direction of the brake disc 6.

  The pressing portion 53 c of the diaphragm 53 is displaced in the direction of the wheel 5 and presses the brake lining 7 against the brake disc 6 provided on the wheel 5 via the piston 52. When the brake lining 7 pressed by the diaphragm 53 and the brake disc 6 come into contact with each other and a frictional force is generated, the rotation of the wheel 5 is braked. As a result, the railway vehicle will eventually stop due to a decrease in speed.

  When the braking of the wheel 5 by the caliper brake device 100 is released by the driver's operation or the like, the brake lining 7 is separated from the state in which the brake lining 7 is in contact with the brake disc 6 by the restoring force of the return spring 44 provided in the adjuster 40. To do. Also, the compressed air in the pressure chamber 55 is discharged from the through hole 56, the bellows portion 53b of the diaphragm 53 returns to the folded shape before braking, and the pressing portion 53c returns to the position before braking. Then, the piston 52 also returns to the position before braking.

  As a result, the brake disc 6 and the brake lining 7 face each other again at a constant interval by the action of the gap adjusting mechanism 45. Therefore, the wheel 5 can rotate without being affected by the caliper brake device 100.

  When the wear amount of the friction member 7b of the brake lining 7 reaches a certain level, it is necessary to replace the brake lining 7 with a new one. At this time, since the gap adjusting mechanism 45 is provided, the guide plate 8 advances toward the brake disk 6 by the amount of wear of the friction member 7b. Therefore, when exchanging the brake lining 7, the operator needs to push the guide plate 8 back to the initial position while dragging and moving the grip 45b of the gap adjusting mechanism 45.

  Here, in the caliper brake device that does not have the protrusion 11 and the contact portion 8c, when the operator tries to push back the guide plate 8 forcibly, the piston 52 is retracted and the caliper is sandwiched between the diaphragms 53. There is a risk of hitting the cover 54.

  On the other hand, in the caliper brake device 100, the caliper main body 10 has the protruding portion 11, and the guide plate 8 has the abutting portion 8c. For this reason, when the brake lining 7 is replaced, if the operator moves the guide plate 8 back to the initial position, the projection 11 and the contact portion 8c come into contact with each other. At this time, there is a gap between the diaphragm 53 and the caliper cover 54.

  Therefore, the piston 52 does not come into contact with the caliper cover 54 with the diaphragm 53 sandwiched therebetween. Therefore, an excessive force is prevented from acting on the mechanism portion of the caliper brake device 100 when the guide plate 8 is forced to be pushed back, so that the safety at the time of replacement of the brake lining 7 can be improved.

  Further, when replacing the brake lining 7, the operator needs to pull out the brake lining 7 from the guide plate 8 after pushing the guide plate 8 back to the initial position.

  The brake lining 7 is inserted into the dovetail groove 8 a of the guide plate 8. Further, both end portions of the brake lining 7 are engaged with the anchor pins 43 to prevent the guide plate 8 from coming off. When the brake lining 7 is replaced, the lower anchor pin 43 is removed from the caliper body 10, and the brake lining 7 is pulled out from the dovetail groove 8a downward while the guide plate 8 is suspended from the upper anchor pin 43.

  At this time, deformation of the back plate portion 7a of the brake lining 7 due to frictional heat at the time of braking may make it difficult to pull out the brake lining 7 from the dovetail groove 8a when the brake lining 7 is replaced. In a state where the guide plate 8 is suspended from the upper anchor pin 43, the guide plate 8 can freely rotate about the upper anchor pin 43. Therefore, the operator may swing left and right to forcibly pull out the brake lining 7, and an excessive force may be applied to a mechanism portion such as the pressing mechanism 50.

  On the other hand, in the caliper brake device 100, when the brake lining 7 is replaced, the operator tries to rotate the guide plate 8 supported by the upper anchor pin 43 in a state where the lower anchor pin 43 is removed. The protrusion 11 contacts the side surface of the guide plate 8. Therefore, when the brake lining 7 is swung left and right to forcibly pull it out, the piston 52 does not collide with the cylinder body 51a with the diaphragm 53 interposed therebetween. Therefore, since the guide plate 8 is greatly shaken to the left and right to prevent an excessive force from acting on the pressing mechanism 50, the safety when replacing the brake lining 7 can be improved.

  When pulling out the brake lining 7 from the guide plate 8, an operator often holds the brake lining 7 from the yoke portion 13 side of the caliper main body 10 and swings it forward. Therefore, the protrusion 11 should just be provided in the side of the lower end of the guide plate 8 in the yoke part 13 side at least.

  Further, in the present embodiment, the protruding portions 11 are provided so as to face the both side portions of the guide plate 8, respectively. Accordingly, even when the operator holds the brake lining 7 and swings it not only on the front side but also on the back side, the piston 52 is prevented from colliding with the cylinder body 51a with the diaphragm 53 interposed therebetween.

  Further, the caliper brake device 100 is provided on each of the left and right wheels 5 of the railway vehicle. The caliper brake device 100 is attached to the carriage so that the pressing mechanism 50 is positioned between the left and right wheels 5 when the caliper brake device 100 is provided on either the left or right wheel 5. Therefore, the caliper main body 10 is attached with the upper part and the lower part being reversed in the case of being provided on one of the left and right wheels 5 and the case of being provided on the other. In the present embodiment, two protrusions 11 are provided at both ends in the longitudinal direction of the guide plate 8, so that the guide plate 8 at the time of replacement of the brake lining 7 can be applied to any of the left and right wheels 5. Can be controlled.

  According to the above embodiment, the following effects are obtained.

  If the guide plate 8 is moved back to the initial position when the brake lining 7 is replaced, the protrusion 11 and the contact portion 8c come into contact with the diaphragm 53 and the caliper cover 54 with a gap. . Therefore, the piston 52 does not come into contact with the caliper cover 54 with the diaphragm 53 sandwiched therebetween. Therefore, an excessive force is prevented from acting on the mechanism portion of the caliper brake device 100 when the guide plate 8 is forced to be pushed back, so that the safety at the time of replacement of the brake lining 7 can be improved.

  Further, when the brake lining 7 is replaced, when the operator tries to turn the guide plate 8 supported by the upper anchor pin 43 in a state where the lower anchor pin 43 is removed, a protrusion is formed on the side surface of the guide plate 8. 11 contacts. Therefore, when the brake lining 7 is swung left and right to forcibly pull it out, the piston 52 does not collide with the cylinder body 51a with the diaphragm 53 interposed therebetween. Therefore, the guide plate 8 is largely shaken to the left and right to prevent an unreasonable force from acting on the pressing mechanism 50, so that the safety when replacing the brake lining 7 can be improved.

  Next, a caliper brake device 101 according to a modification of the embodiment of the present invention will be described with reference to FIG. In the modification shown below, it demonstrates centering on a different point from embodiment of this invention mentioned above, the same code | symbol is attached | subjected to the structure which has the same function, and description is abbreviate | omitted.

  The caliper brake device 101 is different from the caliper brake device 100 in that the guide plate 8 has a protrusion 8d and the caliper body 10 has a first contact portion 11a and a second contact portion 11b as contact portions. Is different.

  The guide plate 8 has four protrusions 8 d that protrude toward the caliper body 10. Two protrusions 8 d are provided so as to protrude from both sides of the guide plate 8. In addition, two protrusions 8d are provided at both ends in the longitudinal direction of the guide plate.

  The protrusion 8d comes into contact with the first contact portion 11a of the caliper body 10 when the guide plate 8 is retracted. Thereby, the protrusion 8d restricts the stroke when the guide plate 8 moves backward.

  The protruding portion 8d is formed with a predetermined gap between it and the second contact portion 11b of the caliper body 10. The protrusion 8d comes into contact with the second contact portion 11b of the caliper body 10 when the lower anchor pin 43 of the guide plate 8 is removed and the guide plate 8 is supported by the upper anchor pin 43 and rotated. Thus, the protrusion 8d restricts the rotation of the guide plate 8 relative to the caliper body 10.

  The caliper body 10 has four first abutting portions 11a with which the tips of the protruding portions 8d of the guide plate 8 can abut each other. The first abutting portion 11a is provided at a position where the tip of the projecting portion 8d faces so that each projecting portion 8d can abut. The caliper main body 10 has four second abutting portions 11b with which the side surfaces of the protruding portions 8d of the guide plate 8 can abut. The second contact portion 11 b protrudes from the caliper body 10 toward the guide plate 8. Thereby, the front-end | tip of the projection part 8d can contact | abut to the 1st contact part 11a, and the side surface of the projection part 8d can contact | abut to the 2nd contact part 11b.

  As described above, when the guide plate 8 has the protruding portion 8d and the caliper body 10 has the first contact portion 11a and the second contact portion 11b as the contact portions, the same as in the above-described embodiment. The effect of. That is, one of the caliper body 10 and the guide plate 8 has projections 11 and 8d that protrude toward the other, and the other of the caliper body 10 and the guide plate 8 is retracted from the guide plate 8. In this case, it is only necessary to have the abutting portions 8c, 11a, 11b with which the projecting portions 11, 8d abut.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

DESCRIPTION OF SYMBOLS 100 Caliper brake device 5 Wheel 6 Brake disc 7 Brake lining 8 Guide plate 8c Contact part 8d Projection part 10 Caliper main body 11 Projection part 11a First contact part (contact part)
11b 2nd contact part (contact part)
12 First caliper arm 14 Second caliper arm 40 Adjuster 43 Anchor pin 44 Return spring 45 Gap adjusting mechanism 50 Pressing mechanism 51 Cylinder 52 Piston 53 Diaphragm (elastic film)
54 Caliper cover 55 Pressure chamber

Claims (7)

A caliper brake device that applies frictional force across a brake disk that rotates with a wheel,
A caliper body supported by the carriage,
A brake lining capable of applying frictional force in sliding contact with the brake disc;
A guide plate that supports the brake lining and moves forward and backward with respect to the caliper body;
A pressing mechanism for pressing the brake lining against the brake disc,
Either one of the caliper main body and the guide plate has a protrusion protruding toward the other,
One of the caliper main body and the guide plate has a contact portion with which the protrusion comes into contact when the guide plate is retracted. The pressing mechanism is
A piston capable of moving forward and backward with respect to the caliper body and pressing the brake lining through the guide plate;
An elastic membrane that abuts on the back surface of the piston and defines a pressure chamber in the caliper body, and elastically deforms by the pressure of the working fluid in the pressure chamber to move the piston;
2. The caliper brake device according to claim 1, wherein a gap is provided between the elastic film and the inner wall of the pressure chamber when the protrusion and the contact portion are in contact with each other. A first anchor pin that rotatably supports one end of the guide plate on the caliper body;
A second anchor pin for locking the other end of the guide plate to the caliper body, and
The said protrusion part controls rotation of the said guide plate with respect to the said caliper main body, when the said 2nd anchor pin is removed and the said guide plate is supported by the said 1st anchor pin. The caliper brake device described in 1. The caliper body has a pair of caliper arms extending so as to straddle the brake disc,
4. The projection according to claim 3, wherein the protrusion protrudes from the caliper body toward the guide plate and is provided at a side of the other end of the guide plate at least on a side to which the pair of caliper arms is connected. The caliper brake device described.   The caliper brake device according to claim 4, wherein a pair of the protrusions are provided on the caliper body so as to face both side portions of the guide plate.   6. The caliper brake device according to claim 4, wherein the protrusion is provided on each of the caliper bodies on both ends in the longitudinal direction of the guide plate. The protrusion protrudes from the guide plate toward the caliper body,
The abutting portion includes a first abutting portion on which a tip of the projecting portion can abut and a second abutting portion on which a side surface of the projecting portion can abut, and is provided on the caliper body. The caliper brake device according to claim 3.

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