JP2017172726A - Brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a service life of a brake lining of a brake device.SOLUTION: A brake device 100 includes a brake body 10, and a first supporting pin 21 axially movably supported by a spherical bearing 24 disposed in a supporting frame 20. The brake body 10 has a first bracket portion 15 connected to an end portion of the first supporting pin 21 at a first caliper arm 12 side with respect to a width center O1 of a wheel 1, and a second bracket portion 16 connected to an end portion of the first supporting pin 21 at a second caliper arm 14 side with respect to the width center O1 of the wheel 1. A first distance L1 along an axial direction of the first supporting pin 21 between a connecting position of the first bracket portion 15 and the width center O1 of the wheel 1 is shorter than a second distance L2 along an axial direction of the first supporting pin 21 between a connecting position of the second bracket portion 16 and the width center O1 of the wheel 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a brake device.

  Patent Document 1 discloses a support frame that is fixed to a carriage of a railway vehicle, a caliper brake body that is slidably supported in the axial direction of the support pin by two support pins with respect to the support frame, and a caliper brake body. There is disclosed a caliper brake device for a railway vehicle that includes two arms that are provided on the vehicle and sandwiches the wheels of the vehicle, a cylinder that is provided in the first arm, and a brake that is held by the two arms. .

Japanese Patent Laid-Open No. 08-226467

  In a floating brake device such as the brake device disclosed in Patent Document 1, the first and second caliper arms of the brake body are provided so as to straddle the wheels, and a pressing portion that advances and retracts the brake lining only in one caliper arm Is provided.

  For this reason, in the brake device described above, the weight balance of the brake body is biased toward the first caliper arm due to the weight of the pressing portion. Therefore, there is a possibility that the first caliper arm side moves downward and the brake body tilts, and the brake lining attached to the second caliper arm comes into contact with the brake disc and is unevenly worn.

  The present invention has been made in view of the above problems, and an object thereof is to improve the life of the brake lining of the brake device.

  1st invention is a brake device which gives frictional force to the brake disk which rotates with a wheel, and is supporting the 1st and 2nd brake lining which can be slidably contacted with a brake disk from both sides of a brake disk, and can give frictional force A brake body, a spherical bearing provided in a support frame attached to the vehicle body or the carriage, and supported in a movable manner in the axial direction and supporting the brake body, and the first brake lining is pressed against the brake disc and the brake A first caliper arm that moves the main body in the axial direction of the support pin and presses the second brake lining against the brake disc, and the brake main body supports the first brake line and is provided with the pressing portion. A second caliper arm that supports the second brake lining; A first bracket connected to the end of the support pin on the first caliper arm side relative to the wheel width center, and a second bracket connected to the end of the support pin on the second caliper arm side relative to the wheel width center. A first distance along the axial direction of the support pin between the connection position of the first bracket part and the center of the width of the wheel, the connection position of the second bracket part and the center of the width of the wheel. It is shorter than the 2nd distance along the axial direction of the support pin in between.

  In the first invention, since the distance between the support frame and the first bracket portion is reduced by configuring the first distance to be shorter than the second distance, the spherical bearing in the support frame is brought closer to the first bracket portion. Can be arranged. As a result, the distance between the spherical bearing, which is the length of the moment arm that moves the second caliper arm side downward, and the second bracket portion increases. Therefore, as compared with the case where the first distance and the second distance are equal, the moment for moving the second caliper arm side downward increases, and cancels out the moment for moving the first caliper arm side downward. For this reason, the inclination of the brake body is reduced.

  According to a second aspect of the present invention, the difference between the first distance and the second distance in a state where the second brake lining is not worn is at least twice the wear limit amount in the second brake lining set in advance. Features.

  In the second invention, the state in which the first distance is always shorter than the second distance is always maintained, so that the inclination of the brake body is more reliably suppressed.

  The third invention is characterized in that the spherical bearing is arranged closer to the first caliper arm than the center of the width of the wheel.

  According to the third invention, the distance between the spherical bearing and the first bracket portion is shortened and the first moment is further reduced, so that the inclination of the brake body is more reliably suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the lifetime of the brake lining of a brake device can be improved.

1 is a plan view of a brake device according to an embodiment of the present invention. It is a front view of a brake device concerning an embodiment of the present invention. It is sectional drawing along the AA in FIG. 1, and is the figure which showed the 1st support pin periphery.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  With reference to FIGS. 1 to 3, a configuration of a brake device 100 according to an embodiment of the present invention will be described.

  The brake device 100 is a floating pneumatic brake for railway vehicles that uses compressed air as a working fluid. Instead of compressed air, other working fluid such as hydraulic oil may be used.

  The brake device 100 applies a frictional force to the brake disc 2 that rotates together with the wheels 1. Specifically, the brake device 100 applies friction force to the brake disc 2 by the first and second brake linings 3 and 4 that can apply friction force by sliding contact with the brake disc from both sides of the brake disc 2, The rotation of the wheel 1 is braked.

  The brake disc 2 is formed on both the front and back surfaces of the wheel 1 and rotates integrally with the wheel 1. Instead of the configuration in which the brake disk 2 is formed integrally with the wheel 1, a separate brake disk 2 that rotates together with the wheel 1 may be provided.

  As shown in FIGS. 1 and 2, the brake device 100 includes a brake body 10 having first and second caliper arms 12 and 14 that respectively support first and second brake linings 3 and 4 via a guide plate 5. And supported by the first brake lining 3 and the first and second support pins 21 and 22 that are supported by the support frame 20 attached to the carriage (not shown) so as to be movable in the axial direction. A pair of anchor pins 33 that support the guide plate 5 to be able to advance and retreat on the brake body 10, and a pressing portion 35 that presses the first and second brake linings 3 and 4 against the brake disc 2 by the pressure of compressed air.

  The brake body 10 is supported by the carriage via the support frame 20 when the brake device 100 is applied to a railway vehicle. The brake body 10 is supported by a vehicle body (not shown) when the brake device 100 is applied to a vehicle other than a railway vehicle.

  As shown in FIG. 1, the brake body 10 includes a first caliper arm 12 that supports the first brake line 3 and is provided with a pressing portion 35, a second caliper arm 14 that supports the second brake lining 4, A yoke portion 13 for connecting the first caliper arm 12 and the second caliper arm 14 and first and second bracket portions 15 and 16 for supporting the brake body 10 on the carriage are provided.

  The first caliper arm 12 and the second caliper arm 14 extend so as to straddle the brake disc 2.

  The first bracket portion 15 is connected to the end portion of the first support pin 21 closer to the first caliper arm 12 than the width center O1 of the wheel 1. The connection position of the first bracket portion 15 with respect to the first support pin 21 (hereinafter simply referred to as “connection position of the first bracket portion 15”) is from the width center O1 of the wheel 1 in the axial direction of the first support pin 21. Along the distance L1. Hereinafter, the distance L1 is referred to as a “first distance L1”.

  The second bracket portion 16 is connected to the end portion of the first support pin 21 on the second caliper arm 14 side with respect to the width center O1 of the wheel 1. The connection position of the second bracket portion 16 with respect to the first support pin 21 (hereinafter simply referred to as “connection position of the second bracket portion 16”) is from the width center O1 of the wheel 1 in the axial direction of the first support pin 21. Along the distance L2. Hereinafter, the distance L2 is referred to as a “second distance L2”.

  The brake device 100 is configured such that the first distance L1 is shorter than the second distance L2 both during non-braking and during braking.

  The first support pin 21 and the second support pin 22 have the same basic configuration. Therefore, in the following, the first support pin 21 and its peripheral structure will be specifically described, and detailed description of the second support pin 22 and its peripheral structure will be omitted.

  As shown in FIG. 3, the first support pin 21 is inserted through the insertion hole 20 a of the support frame 20. Both end portions of the first support pin 21 are connected to the first and second bracket portions 15 and 16 of the brake body 10, respectively. The first support pins 21 are provided in parallel with the rotation shaft (not shown) of the wheel 1 and supported by the support frame 20 so as to be movable in the axial direction. Accordingly, the brake body 10 is supported by the support frame 20 so that the first support pins 21 can move in the axial direction.

  As shown in FIG. 1, the exposed portion of the first support pin 21 is covered with a rubber boot 23 and protected from dust and the like. In this manner, the brake body 10 is floating supported by the first support pins 21 so as to be slidable with respect to the support frame 20. Except for FIG. 1, illustration of the boot 23 is omitted.

  The first and second brake linings 3 and 4 have back plate portions 3a and 4a fixed to the guide plate 5, and friction members 3b and 4b that come into contact with the brake disc 2 during braking. The friction members 3b and 4b are composed of a plurality of segments, and are fixed to the surfaces of the back plate portions 3a and 4a. The first and second brake linings 3 and 4 brake the rotation of the wheel 1 by the frictional force generated by the contact between the friction members 3 b and 4 b and the brake disk 2.

  The first and second brake linings 3 and 4 are opposed to the brake disc 2 with a predetermined interval (state shown in FIG. 1) when not braking. During braking, the first and second brake linings 3 and 4 are each moved toward the brake disc 2 under the pressing force of the pressing portion 35 and are pressed against the brake disc 2 in parallel.

  The guide plate 5 has a dovetail groove 5 a formed along the longitudinal direction and engaged with the back plate portion 3 a of the first brake lining 3. Both ends of the guide plate 5 in the longitudinal direction are supported by the brake body 10 by a pair of anchor pins 33. One anchor pin 33 rotatably supports one end (upper end in FIG. 2) of the guide plate 5 on the brake body 10, and the other anchor pin 33 supports the other end (lower end in FIG. 2) of the guide plate 5 on the brake body. 10 is locked.

  The first caliper arm 12 of the brake main body 10 includes a pair of adjusters 30 disposed at both ends in the longitudinal direction (vertical direction in FIG. 2) and a pressing portion 35 disposed between the pair of adjusters 30. Provided.

  The adjuster 30 adjusts the relative position of the first brake lining 3 with respect to the brake disc 2 to be constant when the brake is released. The adjusters 30 are fastened to the upper and lower ends of the brake body 10 by anchor bolts 32, respectively.

  As shown in FIG. 1, the adjuster 30 is provided with a lining receiver 31 fixed to the brake body 10 by an anchor bolt 32, and is provided so as to be movable forward and backward with respect to the lining receiver 31, and supports the first brake lining 3 on the brake body 10. The anchor pin 33 to be actuated, a return spring (not shown) for urging the first brake lining 3 away from the brake disc 2, and the clearance between the first brake lining 3 and the brake disc 2 is adjusted to be constant when the brake is released. A gap adjusting mechanism (not shown).

  When the first brake lining 3 is close to the brake disc 2, the anchor pin 33 is pulled out from the lining receiver 31 by the guide plate 5 that is displaced together with the first brake lining 3 and is displaced in the axial direction. The anchor pin 33 resists the brake disc 2 from moving the first brake lining 3 in the circumferential direction by frictional force during braking when the first brake lining 3 is in sliding contact with the brake disc 2. 3 is held. A return spring and a gap adjusting mechanism are accommodated on the inner periphery of the anchor pin 33.

  The return spring is a coil spring that is compressed and interposed on the inner periphery of the anchor pin 33. When the brake device 100 changes from the braking state to the non-braking state, the anchor pin 33 pushes back the first brake lining 3 via the guide plate 5 by the biasing force of the return spring, and the first brake lining 3 is removed from the brake disc 2 by a predetermined amount. Are separated by a distance of. Thereby, the distance of the 1st brake lining 3 and the brake disc 2 at the time of brake cancellation | release can be adjusted, and the heat dissipation of the brake disc 2 can be made favorable.

  The clearance adjustment mechanism adjusts the return amount of the first brake lining 3 to be constant by the urging force of the return spring when braking is released. That is, the gap adjusting mechanism always keeps the distance between the first brake lining 3 and the brake disc 2 during non-braking.

  As long as the wear amount of the first brake lining 3 is small and the stroke amount of the anchor pin 33 at the time of braking is small, the anchor pin 33 returns to the original position before braking when the brake is released.

  On the other hand, when the wear of the first brake lining 3 progresses and the amount of movement of the anchor pin 33 during braking increases, the position of the first brake lining 3 when the clearance adjustment mechanism is not braked during braking is released. Is advanced by the worn thickness. Thereby, the space | interval of the 1st brake lining 3 and the brake disc 2 at the time of non-braking can be always kept constant.

  The pressing portion 35 presses the first brake lining 3 against the brake disc 2 by the pressure of the compressed air and moves the brake body 10 in the axial direction of the first support pin 21 by the reaction force to brake the second brake lining 4. Press against the disc 2.

  The pressing part 35 can have any configuration as long as it presses the first and second brake linings 3, 4 against the brake disk 2. For this reason, although detailed description of the press part 35 is abbreviate | omitted, for example, the press part 35 deform | transforms a diaphragm by adjusting the air pressure in the pressure chamber provided inside, and makes a piston retract from a cylinder by the deformation | transformation of a diaphragm. . Thus, the pressing portion 35 presses the first brake lining 3 toward the brake disk 2 via the guide plate 5 in the right direction in FIG. 1, and the reaction force causes the brake body 10 to move in the left direction in FIG. 1. Then, the second brake lining 4 is pulled toward the brake disc 2. In this way, the brake disc 2 is sandwiched between the first and second brake linings 3 and 4, and a frictional force as a braking force is exhibited.

  As shown in FIG. 3, the brake device 100 includes a spherical bearing 24 provided in the insertion hole 20 a of the support frame 20 and slidably supporting the first support pin 21, and a spherical surface in the insertion hole 20 a of the support frame 20. A pair of rubber bushes 27 and 28 provided on both axial sides of the bearing 24 and slidably supporting the first support pins 21 are further provided.

  As shown in FIG. 3, the spherical bearing 24 is disposed on the first caliper arm 12 side (first bracket portion 15 side) with respect to the width center O <b> 1 of the wheel 1. More specifically, the spherical bearing 24 has a first bracket on the left side in FIG. 3 of the two rubber bushings 27 and 28 so that the distance from the connecting position of the first bracket portion 15 is as small as possible. Adjacent to the rubber bush 27 provided on the part 15 side.

  The spherical bearing 24 includes an outer ring 25 having an outer peripheral surface 25a fitted to the inner peripheral surface of the insertion hole 20a and an inner peripheral surface 25b formed in a spherical shape, and the inner periphery of the outer ring 25 through which the first support pin 21 is inserted. And an inner ring 26 having an outer peripheral surface 26a that is formed in a shape corresponding to the surface 25b and is slidably fitted to the inner peripheral surface 25b. That is, the outer ring 25 and the inner ring 26 have bearing surfaces that are slidably fitted to each other, and engage with each other so as to be tiltable (relatively rotatable).

  Thus, the spherical bearing 24 supports the brake body 10 so as to be tiltable with respect to the support frame 20 and slides in the axial direction of the first support pin 21 (the rotation axis direction of the wheel 1) with respect to the support frame 20. Support floating as possible.

  Although illustration is omitted, the second support pin 22 is slidably supported by a rubber bush provided in the insertion hole through the insertion hole formed in the support frame 20. Thus, since the 2nd support pin 22 is supported by rubber-made bushes, tilting of the 1st support pin 21 is not inhibited.

  Next, the operation of the brake device 100 will be described with reference to FIG.

  In the brake device 100, the first support pin 21 is supported by the spherical bearing 24, so that the brake body 10 tilts during braking even when the surface vibration of the brake disk 2 occurs, and the first and first The two brake linings 3 and 4 can follow the brake disc 2.

  The brake device 100 is a floating type brake in which a pressing portion 35 that presses the first and second brake linings 3 and 4 against the brake disc 2 is provided only on the first caliper arm 12 and is not provided on the second caliper arm 14. Device. For this reason, the weight balance of the brake body 10 with respect to the width center O1 of the wheel 1 is biased so that the first caliper arm 12 side becomes heavy.

  The weight of the brake body 10 acts on the first support pin 21 via the first bracket part 15 and the second bracket part 16. In the brake device 100, since the pressing portion 35 is provided only on the first caliper arm 12, the weight W1 acting on the first bracket portion 15 is larger than the weight W2 acting on the second bracket portion 16.

  The first support pin 21 has a first moment that tilts the brake body 10 so that the first bracket portion 15 moves downward with the spherical bearing 24 as a fulcrum, and a brake that causes the second bracket portion 16 to move downward. A second moment that tilts the main body 10 acts.

  The magnitude of the first moment is a distance along the axial direction between the spherical bearing 24 and the first bracket portion 15 that is the length of the moment arm (hereinafter referred to as “first arm length”). It is obtained by multiplying the weight W1 acting on the first bracket portion 15. The magnitude of the second moment is the distance along the axial direction between the spherical bearing 24 and the second bracket portion 16 which is the length of the moment arm (hereinafter referred to as “second arm length”). It is obtained by multiplying the weight W2 acting on the second bracket portion 16.

  Since the brake device 100 is configured such that the first distance L1 is shorter than the second distance L2, the distance between the connection position of the first bracket portion 15 and the support frame 20 is shorter than when both are equal. Become. For this reason, compared with the case where the 1st distance L1 and the 2nd distance L2 are equal, the spherical bearing 24 can be arrange | positioned in the position closer to the 1st bracket part 15. FIG. Therefore, even when the first arm length is short, the second arm length is long, and the weight W1 is larger than the weight W2, the difference between the first moment and the second moment is reduced. Therefore, the inclination of the brake body 10 is suppressed, and the contact of the second brake lining 4 with the brake disc 2 during non-braking is prevented.

  In the brake device 100, the spherical bearing 24 is disposed closer to the first caliper arm 12 (on the first bracket portion 15 side) than the width center O <b> 1 of the wheel 1, and is disposed closer to the first bracket portion 15. The first arm length is shortened and the first moment is further reduced.

  In addition, the first and second brake linings 3 and 4 are preset with a wear limit amount (limit wear amount) that needs to be replaced. Even if the wear amount of the second brake lining 4 is equal to or less than the limit wear amount, the first distance L1 is a case where the brake body 10 and the first support pin 21 move and the brake device 100 enters the braking state. The first distance L1 is set to be shorter than the second distance L2. That is, the difference between the first distance L1 and the second distance L2 when the second brake lining 4 is not worn is set to be twice or more the limit wear amount of the second brake lining 4.

  When the wear of the second brake lining 4 progresses, the brake main body 10 and the first support pin 21 may move in a direction in which the second brake lining 4 approaches the brake disk 2 according to the wear amount. That is, the first distance L1 may increase by the amount of wear of the second brake lining 4, and the second distance L2 may decrease. When the difference between the first distance L1 and the second distance L2 when the second brake lining 4 is not worn is equal to or greater than the limit wear amount, the second brake lining 4 approaches the brake disc by the wear amount. Even in this case, the first distance L1 can always be kept shorter than the second distance L2. Therefore, the inclination of the brake body 10 can be more reliably suppressed.

  According to the above embodiment, there exist the effects shown below.

  In the brake device 100, since the first distance L1 is configured to be shorter than the second distance L2, the distance between the support frame 20 and the first bracket portion 15 is reduced, and the spherical bearing 24 in the support frame 20 is more first. It can be disposed close to the bracket portion 15. Thereby, compared with the case where the 1st distance L1 and the 2nd distance L2 are equal, the 1st moment length can be shortened more and the difference of the 1st moment and the 2nd moment can be reduced. Therefore, the inclination of the brake main body 10 is suppressed, and the contact of the second brake lining 4 with the brake disc 2 during non-braking is prevented. Therefore, the lifetime of the second brake lining 4 can be improved.

  In the brake device 100, the spherical bearing 24 is disposed closer to the first caliper arm 12 (on the first bracket portion 15 side) than the width center O <b> 1 of the wheel 1, and is disposed closer to the first bracket portion 15. For this reason, the first arm length is shortened and the first moment is further reduced.

  Further, in the brake device 100, the difference between the first distance L1 and the second distance L2 when the second brake lining 4 is not worn is set to be equal to or greater than the limit wear amount allowed for the second brake lining 4. . Thereby, even if it is a case where the 2nd brake lining 4 wears and approaches the brake disk 2, the state where 1st distance L1 is always shorter than 2nd distance can be maintained. That is, even when the brake device 100 is braked, the state in which the first distance L1 is always shorter than the second distance L2 is maintained. Thereby, even if it is a case where the 2nd brake lining 4 is worn out, a 1st moment can be reduced and the inclination of the brake main body 10 can be suppressed.

  Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.

  A brake device 100 that applies frictional force to the brake disc 2 that rotates together with the wheel 1 supports the first and second brake linings 3 and 4 that can apply frictional force by slidingly contacting the brake disc 2 from both sides of the brake disc 2. A brake body 10, a first support pin 21 which is supported by a spherical bearing 24 provided in a support frame 20 attached to a vehicle body or a carriage, and which is movable in the axial direction, and which supports the brake body 10, and a first brake lining 3, and a pressing portion 35 that presses the second brake lining 4 against the brake disc 2 by moving the brake main body 10 in the axial direction of the first support pin 21. A first caliper arm that supports the first brake line 3 and is provided with a pressing portion 35. 2, a second caliper arm 14 that supports the second brake lining 4, and a first bracket portion 15 that is connected to the end portion of the first support pin 21 on the first caliper arm 12 side with respect to the width center O <b> 1 of the wheel 1. And a second bracket portion 16 connected to the end portion of the first support pin 21 on the second caliper arm 14 side with respect to the width center O1 of the wheel 1, and the connection position of the first bracket portion 15 and the wheel The first distance L1 along the axial direction of the first support pin 21 with respect to the one width center O1 is the first support pin 21 between the connection position of the second bracket portion 16 and the width center O1 of the wheel 1. Shorter than the second distance L2 along the axial direction.

  In this configuration, since the distance between the support frame 20 and the first bracket portion 15 is reduced by configuring the first distance L1 to be shorter than the second distance L2, the spherical bearing 24 in the support frame 20 is more first. It can be disposed close to the bracket portion 15. Thereby, the distance between the spherical bearing 24 which is the length of the moment arm which moves the 2nd caliper arm 14 side down, and the 2nd bracket part 16 becomes long. Therefore, as compared with the case where the first distance L1 and the second distance L2 are the same, the moment for moving the second caliper arm 14 side downward increases, and cancels the moment for moving the first caliper arm 12 side downward. Fit. For this reason, the inclination of the brake body 10 is reduced. Therefore, the lifetime of the second brake lining 4 of the brake device 100 can be improved.

  Further, in the brake device 100, the difference between the first distance L1 and the second distance L2 in a state where the second brake lining 4 is not worn is more than twice the preset limit wear amount of the second brake lining 4. It is.

  In this configuration, since the state in which the first distance L1 is always shorter than the second distance L2 is always maintained, the inclination of the brake body 10 can be more reliably suppressed. Therefore, the lifetime of the second brake lining 4 can be further improved.

  In the brake device 100, the spherical bearing 24 is disposed on the first caliper arm 12 side with respect to the width center O <b> 1 of the wheel 1.

  According to this configuration, since the first arm length is shortened and the first moment is further reduced, the inclination of the brake body 10 is more reliably suppressed. Therefore, the lifetime of the second brake lining 4 can be further improved.

  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 1 ... Wheel, 2 ... Brake disc, 3 ... 1st brake lining, 4 ... 2nd brake lining, 10 ... Brake main body, 12 ... 1st caliper arm, 14 ... 2nd caliper arm, 15 ... 1st bracket part, 16 DESCRIPTION OF SYMBOLS 2nd bracket part, 20 ... Support frame, 21 ... 1st support pin (support pin), 22 ... 2nd support pin (support pin), 24 ... Spherical bearing, 35 ... Pressing part, 100 ... Brake device

Claims (3)

A brake device that applies frictional force to a brake disk that rotates with a wheel,
A brake body that supports the first and second brake linings capable of applying frictional force by sliding contact with the brake disk from both sides of the brake disk;
A support pin that is supported by a spherical bearing provided in a support frame attached to the vehicle body or the carriage so as to be movable in the axial direction and supports the brake body;
A pressing portion that presses the first brake lining against the brake disc and moves the brake body in the axial direction of the support pin to press the second brake lining against the brake disc;
The brake body is
A first caliper arm that supports the first brake line and is provided with the pressing portion;
A second caliper arm that supports the second brake lining;
A first bracket portion connected to an end portion of the support pin on the first caliper arm side with respect to the width center of the wheel;
A second bracket portion connected to an end portion of the support pin on the second caliper arm side with respect to the width center of the wheel,
The first distance along the axial direction of the support pin between the connection position of the first bracket part and the width center of the wheel is between the connection position of the second bracket part and the width center of the wheel. Brake device characterized by being shorter than 2nd distance along the axial direction of the said support pin.   The difference between the first distance and the second distance in a state where the second brake lining is not worn is at least twice as much as a predetermined limit amount of wear in the second brake lining. The brake device according to claim 1.   3. The brake device according to claim 1, wherein the spherical bearing is disposed closer to the first caliper arm than the width center of the wheel.

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