JP4874164B2 - Brake cylinder - Google Patents

Description

  The present invention includes a push rod for operating a vehicle brake device, and is capable of automatically adjusting the protruding length of the push rod from the cylinder body when the brake is operated, and is particularly suitable for a railway vehicle. About.

  With regard to this type of brake cylinder clearance adjustment device, Patent Document 1 discloses that an output piston including a push rod connected to a brake shoe for braking a wheel tread in a cylinder, and one elastic ring are arranged in two circles. A configuration is disclosed that includes a friction ring assembly having a configuration in which the frictional sliding resistance with the inner surface of the cylinder is increased by expanding it radially outward by being sandwiched between plates. In Patent Document 1, when the brake shoe wears during braking, the output piston and the friction ring assembly move in accordance with the wear amount. On the other hand, when the brake is loosened, the friction ring assembly has a large sliding resistance. As a result, it is assumed that a corresponding gap can be secured between the brake shoe and the wheel tread.

Further, in Patent Document 1, two disks are connected via an adjusting screw, and when the desired sliding resistance value cannot be obtained due to wear on the outer periphery of the elastic ring, the adjusting screw is tightened. Is disclosed that the sliding resistance value can be adjusted.
Japanese Patent Publication No. 6-67725 (Claim 1, FIG. 2)

  However, in the configuration of the above-mentioned Patent Document 1, when returning the cylinder whose protruding length of the push rod is adjusted to the initial state, it is necessary to apply a considerable force to the cylinder against the frictional force by the friction ring assembly. There is a problem because it takes a lot of work to recover. Although it is conceivable that the cylinder is returned to the initial state after the adjustment screw is loosened and the frictional force is reduced, the work becomes complicated, for example, requiring adjustment of the frictional force again by the adjustment screw.

  In view of the above circumstances, an object of the present invention is to provide a brake cylinder that can be easily returned to the initial state from the state in which the protruding length of the push rod is adjusted.

Means and effects for solving the problems

  The present invention relates to a brake cylinder that includes a push rod for operating a vehicle brake device, and that can adjust the protruding length of the push rod from a cylinder body when the brake is operated. And the brake cylinder which concerns on this invention has the following some features in order to achieve the said objective. That is, the brake cylinder of the present invention is provided with the following features alone or in combination as appropriate.

  A first feature of a brake cylinder according to the present invention for achieving the above object is a brake cylinder used in a vehicle brake device, which includes a piston that moves relative to a cylinder body when a pressure fluid is supplied. A shaft rod that moves together with the piston, a push rod attached to the shaft rod, and a protrusion that adjusts the protrusion length of the push rod from the cylinder body in the direction of movement of the piston when the brake is released during brake operation. The push rod is formed in a cylindrical shape having a shaft hole extending in parallel with the moving direction of the piston, and a female screw is threaded on at least a part of the inner surface of the shaft hole, The shaft rod has a male screw threadedly engaged with the female screw threaded into at least a part of an outer surface thereof, is screwed into the shaft hole, and rotates around the shaft from the outside. It is to have a rotational force providing means capable of engaging with the engaging portion to impart.

  According to this configuration, in a state where the rotation of the push rod is constrained, the push rod is rotated around the axis via the engaging portion by a rotational force applying means such as a wrench, so that the push rod is moved with respect to the shaft rod. It can be moved parallel to the moving direction. Thereby, the protrusion length in the moving direction of the piston is adjusted by the protrusion length adjusting means, and the push rod held at the predetermined position can be displaced with a smaller force. Therefore, it is possible to easily return to the initial state from the state in which the protruding length of the push rod is adjusted.

  Further, the second feature of the brake cylinder according to the present invention is that a connecting member that is attached to the tip of the push rod and connects the brake mechanism of the vehicular brake device and the push rod, the rotational force applying means, The shaft rod is formed to have a center hole extending parallel to the moving direction of the piston at the shaft center portion, and the rotational force applying means is a rod-shaped portion fitted into the center hole, A rotation operation portion that is rotatably supported with respect to the connecting member and transmits a rotational force around an axis applied from the outside to the rod-shaped portion, and the engagement portion via the rod-shaped portion. To engage.

  According to this configuration, the shaft bar is rotated around the axis via the rod-shaped part and the engaging part inserted into the center hole of the shaft bar by rotating the rotation operation part rotatably supported by the connecting member. The push rod can be moved in parallel with the moving direction of the piston with respect to the shaft rod. Further, since the brake cylinder is provided with a rotational force applying means having a rotation operation portion and a rod-like portion, when returning the protruding length of the push rod to the initial state, for example, a shaft rod such as a wrench It is not necessary to separately prepare a rotational force applying means for engaging with the engaging portion, and it is possible to easily and quickly return from the state in which the protruding length of the push rod is adjusted to the initial state. .

  A third feature of the brake cylinder according to the present invention is that the rotational force applying means is formed in a cylindrical shape provided with an engagement hole through which the rod-shaped portion passes and engages, and the push rod protrudes. It further has a cylindrical lid member that engages with the engaging portion provided at the tip of the shaft rod in the direction.

  According to this structure, the cylindrical lid member formed in the cylindrical shape provided with the engagement hole through which the rod-shaped portion penetrates and engages the engagement portion provided at the tip of the shaft rod is engaged. Therefore, since it is not necessary to form the engaging portion in the center hole of the shaft rod, the center hole may be a round hole, and processing time is not required. Therefore, in the rotational force imparting means provided in the brake cylinder, the configuration for engaging with the engaging portion of the shaft rod via the rod-like portion can be realized with a simple mechanism.

  Moreover, the 4th characteristic in the brake cylinder which concerns on this invention is that the said center hole is provided as said engaging part by forming so that it may have an inner surface engaged with the said rod-shaped part.

  According to this configuration, by forming the central hole of the shaft rod so as to have an inner surface that engages with the rod-shaped portion, there is no need to separately provide a member provided with the engaging portion, and the labor of assembling can be saved. Therefore, in the rotational force imparting means provided in the brake cylinder, the configuration for engaging with the engaging portion of the shaft rod via the rod-like portion can be realized with a simple mechanism.

  A fifth feature of the brake cylinder according to the present invention is that the engaging portion is provided at a tip end of the shaft rod in a protruding direction of the push rod.

  According to this configuration, it is possible to perform an operation of rotating the shaft rod by inserting a part of the rotational force applying means from the tip end side of the push rod in the protruding direction. In this case, the adjustment work can be performed even if another in-vehicle device is arranged on the cylinder body side of the brake cylinder. Further, when the brake is released, the push rod is held in a state where it is pulled back into the cylinder body, so that a space is secured on the protruding side of the push rod. Therefore, adjustment work can be performed using the space.

  The sixth feature of the brake cylinder according to the present invention is that the brake cylinder according to the present invention further includes a connecting member that is attached to the tip of the push rod and connects the brake mechanism of the vehicle brake device and the push rod. An opening that opens from the outside toward the engaging portion is formed, and a lid that can open and close the opening is attached.

According to this structure, a part of rotational force provision means can be inserted from the opening part of a connection member, and a shaft part can be rotated via an engaging part. This makes it possible to return the protruding length to the initial state without disconnecting the brake mechanism and the brake cylinder.
In addition, since the lid is attached to the opening, it is possible to prevent dust and the like from entering the shaft hole of the push rod from the outside through the opening by closing the opening with the lid. .

  A seventh feature of the brake cylinder according to the present invention is that the protrusion length adjusting means includes a guide member that is attached to the push rod and is movable with the push rod, and the push rod is connected to the guide member. That is, the guide member is attached to the push rod so that a predetermined resistance force acts when moving in a direction parallel to the moving direction of the piston.

According to this configuration, since the guide member and the push rod are attached so as to have a predetermined resistance force, when a force greater than a predetermined resistance force such as a friction force acts between the guide member and the push rod, The push rod is displaced with respect to the guide member, and the protruding length from the cylinder body when the brake is released is adjusted. Thereby, adjustment of protrusion length can be performed with a simple structure.
Further, in the case of having the first feature, in a state in which the rotation of the push rod is constrained, the push rod is rotated around the axis through the engaging portion using the rotational force applying means, so that the push rod is moved in the moving direction of the piston. Therefore, a force greater than a predetermined resistance force can be applied between the push rod and the guide member by the rotation of the shaft rod. Thereby, it is possible to easily return to the initial state from the state in which the protruding length of the push rod is adjusted.

  Further, an eighth feature of the brake cylinder according to the present invention is that the protrusion length adjusting means includes an irregular surface formed by repeatedly arranging irregularities in the movement direction of the push rod on the outer surface of the push rod, the push rod and the guide. An elastic member disposed between the guide member and the guide member. The guide member is formed with a space that opens at least the uneven surface side. The elastic member is disposed in the space, and the elastic member is deformed. Then, the guide member and the push rod are connected by engaging with the uneven surface, and when a predetermined force is applied to the guide member, the elastic member gets over the convex portion of the uneven surface by deformation. Thus, the push rod is displaced with respect to the guide member.

Conventionally, for example, according to the configuration described in Patent Document 1, since the sliding resistance is generated only by the frictional force between the flat cylinder inner peripheral surface and the elastic ring surface, the surface state and wear of the cylinder inner peripheral surface, The sliding resistance of the friction ring assembly easily becomes unstable due to wear on the surface of the elastic ring. In addition, since adjustment is performed using an adjustment screw, adjustment and management of sliding resistance may be complicated.
In this respect, according to the configuration having the eighth feature described above, the elastic member is deformed and engaged (engraved), so that the frictional force or coupling force between the push rod and the guide member can be stabilized. . Thereby, adjustment and management of sliding resistance can be easily performed with a simple configuration.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an overall cross-sectional view showing a brake non-operating state (brake release state) of a brake cylinder according to the first embodiment of the present invention.

  The brake cylinder 1 according to the present embodiment is used in a disc brake type brake device, and is driven by supply of compressed air (pressure fluid). Brake levers, which are part of a brake mechanism (not shown), are installed at both ends (cylinder main body side and push rod side) of the brake cylinder 1, respectively, The braking force is obtained by sandwiching a disc-shaped brake disc that rotates in conjunction with the rotation of the wheel of a railway vehicle by a pair of brake pads (control elements) attached to the tip of the brake lever by operating the brake lever. Is generated.

  The brake cylinder 1 is not limited to use in a disc brake type brake device, and a tread surface that generates a braking force by attaching a control device to the tip side of the push rod and bringing the control device into contact with the tread surface of the wheel. It can also be used for a brake type brake device.

  As shown in FIG. 1, the brake cylinder 1 includes a cylinder body 2 that includes a first casing portion 21 and a second casing portion 22 to form an internal space 2a, a piston 3 disposed in the internal space 2a, A shaft rod 4 that moves together with the piston 3, a cylindrical push rod 5 attached to the shaft rod 4, and a projection length adjusting means 6 that adjusts the projection length of the push rod 5 from the cylinder body 2 are mainly used. It is prepared as a simple configuration.

  The first casing portion 21 has a substantially cup shape (cylinder shape) with a bottom, and the second casing portion 22 is fixed by a bolt 23 so as to close the open side of the first casing portion 21. Thereby, the internal space 2a is formed. In addition, a brake lever of a brake device (not shown) is connected to the end of the first casing portion 21.

  The piston 3 is disposed so as to divide the internal space 2a into two, and is configured to be airtightly fitted to the inner peripheral surface of the first casing portion 21 and to be slidable in the axial direction. A space on one side where the internal space 2a is partitioned by the piston 3 is a pressure chamber 2b, and a compressed air supply / exhaust port formed in the cylinder body 2 (first casing portion 21) is formed in the pressure chamber 2b. 24 is communicated. In order to improve the air tightness of the pressure chamber 2b, a cup packing 31 is attached to the piston 3.

  A proximal end portion of the outer cylinder 11 is fixed to the piston 3 disposed in the first casing portion 21 via a flange plate 12 and a bolt 13. A head flange 14 is housed inside the base end of the outer cylinder 11. A tapered constricted portion 15 is formed on the inner peripheral surface of the shaft end of the outer cylinder 11, and the slanted outer edge portion of the head flange 14 is moved to the distal end side (the advance side of the push rod 5) by the constricted portion 15. ) Can be pushed to. Further, the outer cylinder 11 is provided with a push pin 16 projecting inward, and the distal end of the push pin 16 can push the head flange 14 toward the base end side (the retreat side of the push rod 5). It is like that.

  The shaft rod 4 has a male screw 41 threaded on the outer peripheral surface thereof, and is installed in a state of being screwed with a female screw 51 threaded in the vicinity of the end portion on the pressure chamber 2b side on the inner peripheral surface of the push rod 5. ing. Further, the base end portion of the shaft rod 4 located on the pressure chamber 2b side is attached to the head flange 14, and the other end of the shaft rod 4 is a hexagonal engagement portion corresponding to the head portion of a hexagon bolt. 42 is provided. The engaging portion 42 may be formed integrally with the shaft rod 4, or may be formed as a separate member and fixed to the shaft rod 4.

  The push rod 5 is formed in a cylindrical shape having a shaft hole extending in parallel with the moving direction of the piston 3, and a female screw 51 is threaded in the vicinity of the end portion on the pressure chamber 2b side on the inner peripheral surface of the shaft hole. . Moreover, the outer peripheral surface has an uneven surface 52 formed by repeatedly arranging unevenness in the moving direction of the push bar 5. Note that the unevenness level difference of the uneven surface 52 is, for example, about 0.3 millimeters, and the uneven surface 52 constitutes a part of the configuration of the protruding length adjusting means 6.

  In addition, a brake lever (not shown) which is a part of the brake mechanism of the brake device is connected to the tip of the push bar 5 via a connecting member 7, and the driving force by the brake cylinder 1 is applied to the brake mechanism. It is possible to communicate. The connecting member 7 and the push bar 5 are fixed by pins or the like in order to restrict the rotation around the relative axis.

  The connecting member 7 at the tip of the push bar 5 is formed with an opening 7 a that opens from the outside toward the engaging portion 42. The opening 7a is formed in a taper shape with a diameter decreasing toward the push rod 5, and a female screw is threaded on the inner periphery. The opening portion 7a is detachably screwed with a lid portion 8 in which a male screw screwed into the female screw is threaded on the outer periphery, so that the opening can be opened and closed.

  Further, between the push bar 5 and the second casing part 22, the opening part of the insertion hole 22 a formed at the end opposite to the first casing part 21 of the second casing part 22 is covered. A flexible bellows cover 25 for dust prevention is installed.

  The protruding length adjusting means 6 is arranged between the guide member 61 that is attached to the push bar 5 and is movable with the push bar 5, the uneven surface 52 on the outer surface of the push bar 5, and the push bar 5 and the guide member 61. An O-ring (elastic member) 62. In this embodiment, an O-ring having a substantially circular cross section with a diameter of about 5 millimeters, which has high availability and relatively high dimensional accuracy, is used as the elastic member, but an elliptical or rectangular cross sectional shape is used. The main raw material may be an elastic member such as rubber.

  The guide member 61 is formed in a cylindrical shape and is rotatably supported on the outer side of the shaft rod 4 via a thrust bearing (bearing) 17. The guide member 61 has a stepped shaft hole through which the push bar 5 is inserted, and an O-ring housing space 61a is formed in a portion formed in a large diameter of the shaft hole. The O-ring housing space 61a is formed between the bottom portion (stepped portion) 61c of the large-diameter hole and the retaining ring 63 fitted to the opening end of the large-diameter hole, and the inner side (uneven surface 52 of the push rod 5). The side facing the

  In the O-ring housing space 61a, a plurality (four) of O-rings 62 are arranged in the axial direction, and backup rings 64 are arranged at both ends of each O-ring 62 (between adjacent O-rings 62). It has a configuration. The positions of the bottom portion 61c and the retaining ring 63 are the width of the O-ring 62 so that the O-ring 62 is slightly deformed in the axial direction between the bottom portion 61c of the large-diameter hole and the retaining ring 63. It is set in relation to. As a result, the O-ring 62 expands toward the inner peripheral side and engages with the uneven surface 52 on the outer peripheral surface of the push bar 5. Therefore, when the push bar 5 moves relative to the guide member 61 in a direction parallel to the moving direction of the piston 3, a predetermined resistance force acts.

  The second casing portion 22 of the cylinder body 2 is screwed with a rotation-stop bolt 26, and the tip portion thereof is a long hole 11 a provided in the outer cylinder 11 and a long hole-like groove 61 b provided in the guide member 61. Is inserted. As a result, the outer cylinder 11 and the guide member 61 are prevented from rotating. The long hole 11a and the groove 61b are formed so that the longitudinal direction thereof is parallel to the moving direction of the piston 3, and the bolt 26 can move in the long hole 11a and the groove 61b in accordance with the braking operation. Yes.

  A restricting body 65 projects from the guide member 61 in the radial direction, and the restricting body 65 is inserted into a long hole 11 b provided in the outer cylinder 11. The long hole 11 b is formed so that the longitudinal direction is parallel to the moving direction of the piston 3. On the other hand, a stroke adjusting bolt 66 is screwed to the second casing portion 22, and when the guide member 61 moves to the advance side by a predetermined stroke, the regulating body 65 comes into contact with the tip of the stroke adjusting bolt 66, Further movement to the advancing side is regulated. The stroke adjusting bolt 66 can be adjusted in its tip position by rotating.

  A return spring 27 for biasing the piston 3 in the retracting direction is interposed between the second casing portion 22 and the piston 3. A biasing spring 28 is interposed between the head flange 14 and the guide member 61.

  With the above configuration, when compressed air is supplied to the supply / exhaust port 24 from the brake inoperative state of FIG. 1, the piston 3 is pushed rightward in FIG. The cylinder 11 moves to the right. Then, the constricted portion 15 formed on the inner peripheral surface of the base end portion of the outer cylinder 11 presses the outer edge of the head flange 14, so that the head flange 14 also moves to the right in FIG. The push bar 5 connected to the bar 4 also moves to the right. FIG. 2 shows a state in which the push bar 5 has moved (a state in which the regulating body 65 has moved to a position where it comes into contact with the stroke adjusting bolt 66). At this time, the head flange 14 and the shaft rod 4 do not rotate but are simply pushed by the outer cylinder 11. In this way, the push bar 5 is pushed to the right in FIG. 1 (with the outer cylinder 11 and the guide member 61) and advanced to operate the brake device.

  Subsequently, when the compressed air is discharged from the supply / discharge port 24, the piston 3 is pushed to the left in FIG. 1 by the return spring 27, so that the outer cylinder 11 is pulled to the left. Therefore, the head flange 14 is pushed by the push pin 16, and the shaft rod 4 and the push rod 5 connected thereto are also pulled leftward and retracted. Thus, the non-operating state of FIG. 1 is restored.

  On the other hand, when the braking surface of the brake pad is worn, the stroke of the push bar 5 necessary for operating the brake increases, and the stroke of the guide member 61 coupled to the push bar 5 via the O-ring 62 also increases. When this stroke exceeds the stroke defined by the stroke adjustment bolt 66, the restricting body 65 comes into contact with the tip of the stroke adjustment bolt 66, so that a large return force is applied to the guide member 61. Therefore, after the restricting body 65 comes into contact with the tip of the stroke adjusting bolt 66, the O-ring 62 is deformed and gets over the convex portion of the concave and convex surface 52, so that the push rod 5 corresponding to the stroke of the push rod 5 beyond that. Is displaced (displaced) in the advancing direction with respect to the guide member 61. That is, when the piston 3 moves in the protruding direction (right side in the figure) from the brake released state shown in FIG. 1, the regulating body 65 comes into contact with the tip of the stroke adjusting bolt 66 as shown in FIG. As shown in FIG. 3, the shaft rod 4 and the push rod 5 are displaced in the projecting direction, leaving only the guide member 61 as shown in FIG. In FIG. 3, the relative movement amount is large for easy understanding of the displacement of the push bar 5 with respect to the guide member 61. However, the amount of wear of the brake pad for each brake operation is usually extremely small. Therefore, the amount of displacement of the push bar 5 per one time is also as small as the interval between the convex portions of the concave and convex surface 52.

  When the compressed air is discharged from the supply / exhaust port 24 after the relative displacement between the push rod 5 and the guide member 61 is released and the brake is released, the piston 3 is returned to the left in the drawing by the return spring 27 and pulled outside. The head flange 14 is pushed leftward by the push pin 16 of the cylinder 11. Then, the head flange 14 rotates together with the shaft rod 4 so that the shaft rod 4 is pulled out from the push rod 5, and the displacement of the push rod 5 in the advancing direction with respect to the guide member 61 is absorbed by the screw movement. FIG. 4 shows a state when returning from the state shown in FIG. 3 to the same brake release state as FIG. As shown in FIG. 4, as a result, the push bar 5 protrudes in the advancing direction by the amount of the deviation. In FIG. 4, the amount of deviation when compared with the initial state (initial position) shown in FIG.

  Thus, the protruding length of the push bar 5 is adjusted, and the vehicle brake device can be operated with the normal stroke of the push bar 5 from the next time.

  FIG. 5 is a diagram showing a brake release state when the protruding length of the push rod 5 is adjusted when the brake pad is worn out by a considerable amount due to long-term use. Compared with the brake release state shown in FIG. 1, the push bar 5 has moved a considerable amount in the protruding direction, and the protruding length from the cylinder body 2 is increased.

  In the state shown in FIG. 5, when replacing the used brake pad with the same new brake pad as before wearing, the initial position before the position of the push bar 5 in the brake released state is adjusted by the protruding length adjusting means 6. It is necessary to return to.

  In the brake cylinder 1 of the present embodiment, by removing the lid portion 8 screwed into the opening 7a of the connecting member 7, for example, a socket 91 (rotation) that engages with the engaging portion 42 through the opening 7a. Force applying means) and an extension bar 92 (rotational force applying means) connected in series to the socket 91 can be inserted into the engaging portion 42 from the outside.

  The socket 91 is attached to the engaging portion 42, and a large rotational force is transmitted to the engaging portion 42 by rotating the socket 91 in a predetermined direction by a ratchet handle wrench 93 or the like (rotational force applying means) via the extension bar 92. It becomes possible to do. As a result, a rotational force around the shaft acts on the shaft rod 4 via the engaging portion 42, and the push rod 5 that is restrained from rotating about the shaft by the connecting member 7 has a screw (a male screw 41 and a female screw 51. ) Exerts a force in the pull-in direction. Accordingly, the push bar 5 can be displaced in the retracting direction against the resistance force received from the O-ring 62 disposed between the push bar 5 and the guide member 61.

  The push rod 5 can be displaced in the protruding direction by rotating the shaft rod 4 in the reverse direction. Further, by adjusting the pitch of the screws (the male screw 41 and the female screw 51), for example, by forming the pitch smaller, the push rod 5 can be displaced in parallel with the moving direction of the piston 3 with a smaller rotational force. It becomes.

  As described above, the brake cylinder 1 according to this embodiment includes the piston 3 that moves relative to the cylinder body 2 when the pressure fluid is supplied, the shaft rod 4 that moves together with the piston 3, and the shaft rod 4. And a projection length adjusting means 6 for adjusting the projection length of the push rod 5 from the cylinder body 2 in the moving direction of the piston 3 when the brake is released during brake operation. The push bar 5 is formed in a cylindrical shape having a shaft hole extending in parallel with the moving direction of the piston 3, and a female screw 51 is threaded on at least a part of the inner surface of the shaft hole. A male screw 41 that engages with the female screw 51 is screwed into at least a part of the outer surface and screwed into the shaft hole, and a rotational force is applied to the socket 91 or the like that applies a rotational force around the shaft from the outside. It has a step engageable with the engaging portion 42.

  According to this configuration, in the state in which the rotation of the push rod 5 is restrained by the connecting member 7 or the like, the shaft rod is connected via the engaging portion 42 using the ratchet handle wrench 93 or the like connected to the socket 91 via the extension bar 92. By rotating 4 around the axis, the push bar 5 can be moved in parallel with the movement direction of the piston 3 with respect to the axis bar 4. Thereby, the protrusion length in the moving direction of the piston 3 is adjusted by the protrusion length adjusting means 6, and the push bar 5 held at a predetermined position can be displaced with a smaller force. Therefore, it is possible to easily return to the initial state from the state in which the protruding length of the push rod 5 is adjusted.

  Further, since the female screw 51 is threaded only in a part of the inner peripheral surface of the shaft hole formed in the push rod 5 near the end portion on the pressure chamber 2b side, the rotational resistance of the screw is reduced. The shaft rod 4 can be rotated with a smaller force.

  The protrusion length adjusting means 6 includes a guide member 61 that is attached to the push rod 5 and is movable with the push rod 5. The push rod 5 is parallel to the movement direction of the piston 3 with respect to the guide member 61. The guide member 61 is attached to the push bar 5 so that a predetermined resistance force acts when moving in any direction.

  According to this configuration, when the push rod 5 moves relative to the guide member 61, the guide member 61 applies the predetermined resistance to the push rod 5 from the guide member 61 side. Therefore, when a force more than a predetermined resistance force acts between the guide member 61 and the push rod 5, the push rod 5 is displaced with respect to the guide member 61, and the cylinder at the time of releasing the brake The protruding length from the main body 2 is adjusted. Thereby, adjustment of protrusion length can be performed with a simple structure.

  In addition, by rotating the shaft rod 4 around the axis via the engaging portion 42 in a state where the rotation of the push rod 5 is constrained, the push rod 5 can be displaced in parallel with the moving direction of the piston 3. Due to the rotation of the shaft rod 4, it becomes possible to apply a force greater than a predetermined resistance force between the push rod 5 and the guide member 61. Thereby, it is possible to easily return to the initial state from the state in which the protruding length of the push bar 5 is adjusted.

  Further, the protrusion length adjusting means 6 is disposed between an uneven surface 52 formed by repeatedly arranging unevenness on the outer surface of the push bar 5 in the moving direction of the push bar 5, and the push bar 5 and the guide member 61. The guide member 61 has a space 61a that opens at least the uneven surface 52 side. The O-ring 62 is disposed in the space 61a, and the O-ring 62 is deformed. Then, the guide member 61 and the push bar 5 are connected by engaging with the concave and convex surface 52, and when a predetermined force is applied to the guide member 61, the O ring 62 is deformed to deform the concave and convex surface. The push bar 5 is displaced with respect to the guide member 61 by overcoming the convex portion 52.

  According to this configuration, since the O-ring 62 is deformed and engages (engages), the frictional force or coupling force between the push bar 5 and the guide member 61 can be stabilized. Thereby, adjustment and management of sliding resistance can be easily performed with a simple configuration.

  Further, by using the O-ring 62 as the elastic member, it becomes easier to engage (bite) into the concave portion of the concave / convex surface 52 than when an elastic member having a rectangular cross section is used, for example, frictional force or The binding force can be stabilized.

  In addition, since a plurality of O-rings 62 are provided, the frictional force or coupling force between the push bar 5 and the guide member 61 can be further stabilized as compared with the case where the O-ring is provided alone.

  Furthermore, since the backup ring 64 is provided between the plurality of O-rings 62, the O-ring 62 is prevented from entering the inside of the adjacent O-ring 62 or riding on the outside of the adjacent O-ring 62. Thus, the push bar 5 and the guide member 61 can be reliably coupled by frictional force.

  Further, since the engaging portion 42 is provided at the tip end of the shaft rod 4 in the protruding direction of the push rod 5, rotational force applying means such as the socket 91 and the extension bar 92 from the tip end side of the push rod 5 in the protruding direction. The shaft rod 4 can be rotated by inserting a part thereof. In this case, the adjustment work can be performed even if another vehicle-mounted device is disposed on the cylinder body 2 side of the brake cylinder 1. Further, when the brake is released, the push bar 5 is held in a state of being pulled back into the cylinder body 2, so that a space is secured on the protruding side of the push bar 5. Therefore, adjustment work can be performed using the space.

  The push rod 5 is further provided with a connecting member 7 that is attached to the tip of the push rod 5 and connects the brake mechanism of the vehicular brake device and the push rod 5. The connecting member 7 is opened from the outside toward the engaging portion 42. An opening 7a is formed, and a lid 8 capable of opening and closing the opening 7a is attached.

According to this configuration, it is possible to rotate the shaft portion 4 via the engaging portion 42 by inserting a part of the rotational force applying means such as the socket 91 and the extension bar 92 from the opening 7 a of the connecting member 7. As a result, the protruding length can be returned to the initial state without disconnecting the brake mechanism and the brake cylinder 1.
In addition, since the lid 8 is attached to the opening 7a, dust or the like can enter the shaft hole of the push rod 5 from the outside through the opening 7a by closing the opening 7a with the lid 8. Intrusion can be suppressed.

(Second Embodiment)
Next, a brake cylinder according to a second embodiment of the present invention will be described. FIG. 6 is an overall cross-sectional view showing a brake non-operating state of the brake cylinder 101 according to the second embodiment. A brake cylinder 101 shown in FIG. 6 is used for a disc-type brake device, like the brake cylinder 1 of the first embodiment, and includes the same components as the brake cylinder 1 and is configured to operate similarly. Has been. That is, the brake cylinder 101 is similar to the brake cylinder 1 in that the cylinder body 2, the piston 3, the shaft rod 112, the push rod 5, the protruding length adjusting means 6, and the connecting member 7 are the main components. (In FIG. 6, a cross section corresponding to a state in which right and left are opposite to those in FIG. 1 is shown.) However, the brake cylinder 101 is different from the brake cylinder 1 in that the rotational force applying means 111 provided as its own configuration is provided and a part of the configuration relating to the shaft rod 112. In the following description, components in the brake cylinder 101 that are configured in the same manner as the brake cylinder 1 and operate in the same manner are denoted by the same reference numerals in FIG. 6 as those in FIG.

  7 is a view showing the shaft 112, in which FIG. 7 (b) is a front view of the shaft shown in a cutaway section, FIG. 7 (a) is a left side view of FIG. 7 (b), and FIG. (C) is a right side view of FIG. 7 (b). As shown in FIGS. 6 and 7, the shaft rod 112 is formed so as to have a center hole 112 a extending in parallel with the moving direction of the piston 3 at the center of the shaft. The central hole 112 a is formed as a circular hole having a circular cross section perpendicular to the axial longitudinal direction, and is formed so as to open at one end 112 b disposed so as to face the connecting member 7. Further, a male screw portion 112c is formed on the outer periphery of the end portion 112b to be screwed with a cylindrical lid member 115 of the rotational force applying means 111 described later. The male threaded portion 112c is formed as a screw whose rotational direction is opposite to that of the male thread 41 formed on the outer periphery of the body portion of the shaft 4 and is engaged with the rotational force applying means 111 in this embodiment. It is comprised as an engaging part.

  As shown in FIG. 6, the rotational force applying means 111 includes a rod member (rod-like portion) 113, a manual adjustment knob (rotation operation portion) 114, a cylindrical lid member 115, and a pin 116. Unlike the case of 1st Embodiment, this rotational force provision means 111 is comprised by the form integrated in the brake cylinder 1 as a component, and does not need to prepare separately.

  FIG. 8 is a view showing the rod member 113 constituting the rod-like portion of the present embodiment, in which FIG. 8 (b) is a front view and FIG. 8 (a) is a left side view. As shown in FIGS. 6 and 8, the bar member 113 is formed in a bar shape extending in the same cross section, and is inserted into the center hole 112 a from the opening provided in the end 112 b of the shaft bar 112. It has become. A cross section perpendicular to the longitudinal direction of the rod member 113 is formed by arranging a pair of flat surface portions 113a and 113a facing each other in parallel positions and a pair of facing arc portions 113b and 113b in four directions. It has an outer shape. The diameter of the circle in which each of the pair of arc portions 113b and 113b is arranged is set to be slightly smaller than the center hole 112a of the shaft rod 112. In addition, the rod member 113 is provided with a pin hole 113c that is formed so as to extend perpendicularly to the longitudinal direction at one end portion disposed so as to protrude from the shaft rod 112. A pin 116 is inserted into the pin hole 113c. The manual adjustment knob 114 is connected to the bar member 113 through a pin 116 inserted into the pin hole 113c. In this embodiment, the manual adjustment knob (rotating operation portion) 114 and the rod member (rod-like portion) 113 are formed separately and connected by the pin 116, but this is not the case. Also good. For example, the manual adjustment knob 114 and the bar member 113 may be integrally formed.

  9A and 9B are diagrams showing the manual adjustment knob 114, in which FIG. 9B is a cross-sectional view seen from the front side, and FIG. 9A is a left side view. As shown in FIGS. 6 and 9, the manual adjustment knob 114 is formed with a hexagonal knob part 114a provided at one end and an opening 114b provided at the other end. The one end of the bar member 113 is inserted. Further, the manual adjustment knob 114 is formed with a pair of pin support holes 114c and 114c penetrating sideways through the opening 114b. The pin 116 is inserted into the pair of pin support holes 114c and 114c and the pin hole 113c in a state where one end of the bar member 113 is inserted into the opening 114b. Are connected via a pin 116. Further, the manual adjustment knob 114 is formed such that an outer peripheral edge portion 114d between the knob portion 114a at one end and the opening 114b at the other end has a circular outer shape. The manual adjustment knob 114 is rotatably supported by a rotation support hole 117 formed in the central portion of the outer peripheral edge portion 114d with respect to the connection member 7 so that the knob portion 114a is removed from the connection member 7. It is arranged in a state protruding toward the direction. Therefore, by manually rotating the knob portion 114a, the manual adjustment knob 114 is rotated with respect to the connecting member 7, and the bar member 113 connected to the manual adjustment knob 114 via the pin 116 is also rotated. It has become. That is, the manual adjustment knob 114 constitutes a rotation operation portion of the present embodiment that is rotatably supported with respect to the connecting member 7 and transmits a rotational force about an axis applied from the outside to the rod member 113. . The manual adjustment knob 114 does not necessarily have to be operated manually, and can be rotated using a tool such as a wrench.

  10A and 10B are views showing the cylindrical lid member 115, in which FIG. 10B is a cross-sectional view seen from the front side, and FIG. 10A is a left side view. As shown in FIGS. 6 and 10, the cylindrical lid member 115 is formed in a cylindrical shape, and has an outer peripheral shape of the rod member 113 so that the rod member 113 penetrates and engages with one end portion. An engagement hole 115a formed in a corresponding inner peripheral shape is formed as an opening, and a shaft rod insertion hole 115b into which one end 112b of the shaft rod 112 is inserted is formed at the other end. A female screw portion 115c that is screwed with the male screw portion 112c of the shaft rod 112 is formed on the inner wall portion of the shaft rod insertion hole 115b. For this reason, when one end 112b of the shaft rod 112 is screwed into the cylindrical lid member 115, the male screw portion 112c and the female screw portion 115c are connected to the male screw 41 of the shaft rod 112 and the female screw of the push rod 5. The screw 51 is screwed in the direction opposite to the screwing direction. As described above, the cylindrical lid member 115 engages with the rod member 113 through the engagement hole 115a and is a male screw portion which is an engagement portion provided at the tip of the shaft rod 112 (in the protruding direction of the push rod 5). 112c is engaged in a state where it covers the rotating part 112c, whereby the rotational force applying means 111 is engaged with the male screw part (engaging part) 112c via the bar member 113.

  The brake cylinder 101 described above performs a brake operation in the same manner as the brake cylinder 1 of the first embodiment when compressed air is supplied from the supply / exhaust port 24, and brakes when the compressed air is discharged from the supply / exhaust port 24. The brake release operation is performed in the same manner as the cylinder 1. When the braking surface of the brake pad is worn, the protruding length of the push bar 5 is adjusted by the protruding length adjusting means 6 as in the brake cylinder 1. However, in the brake cylinder 101, when the used brake pad is replaced with the same new brake pad as before wearing, the rotational force of the socket 91, the extension bar 92, the ratchet handle wrench 93, etc. as in the first embodiment. There is no need to prepare the applying means separately, and the rotational force applying means 111 provided in the brake cylinder 101 returns the position of the push bar 5 in the brake released state to the initial position before being adjusted by the protruding length adjusting means 6. Be able to.

  In the brake cylinder 101, when the brake pad is replaced, the manual adjustment knob is operated by rotating the knob portion 114a of the manual adjustment knob 114 exposed so as to protrude outward from the connecting member 7 in a predetermined direction. The bar member 113 is rotated with respect to the connecting member 7 through the pin 116 together with 114. As the rod member 113 rotates, the cylindrical lid member 115 engaged with the rod member 113 through the engagement hole 115a rotates, and the female screw portion 115c and the male screw rotate with respect to the cylindrical lid member 115. A rotational force around the axis acts on the shaft rod 112 engaged by screw connection with the portion 112c. As a result, a force in the pull-in direction acts on the push bar 5 whose rotation about the axis is restricted by the connecting member 7 by the action of the screws (the male screw 41 and the female screw 51). As a result, the push bar 5 can be displaced in the pull-in direction against the resistance force received from the O-ring 62 disposed between the push bar 5 and the guide member 61.

  As described above, according to the brake cylinder 101 according to the present embodiment, the center adjustment hole 112a of the shaft rod 112 is rotated by rotating the manual adjustment knob (rotation operation unit) 114 that is rotatably supported by the connecting member 7. The shaft rod 112 is rotated around the axis via the rod member (rod-shaped portion) 113 and the male screw portion (engagement portion) 112c inserted into the shaft rod 112, and the push rod 5 is moved in the direction of movement of the piston 3 with respect to the shaft rod 112. It can be moved in parallel. Since the brake cylinder 101 is provided with the rotational force applying means 111 having the manual adjustment knob 114 and the rod member 113, a rotational force applying means for engaging with the engaging portion of the shaft rod 112 is separately prepared. There is no need, and it is possible to easily and quickly return the push rod 5 from the adjusted state to the initial state.

  Further, according to the brake cylinder 101, the male screw portion provided at the tip of the shaft rod 112 has a cylindrical lid member 115 formed in a cylindrical shape provided with an engagement hole 115a through which the rod member 113 is engaged. (Engagement part) By covering and engaging 112c, in the rotational force provision means 111 with which the brake cylinder 101 was equipped, the structure engaged with the engagement part of the shaft rod 112 via the rod member 113 is simplified. It can be realized by the mechanism.

(Third embodiment)
Next, a brake cylinder according to a third embodiment of the present invention will be described. FIG. 11 is an overall cross-sectional view showing a brake non-operating state of the brake cylinder 102 according to the third embodiment. A brake cylinder 102 shown in FIG. 11 is used in a disc-type brake device, like the brake cylinder 1 of the first embodiment, and includes the same components as the brake cylinder 1 and is configured to operate similarly. Has been. That is, the brake cylinder 102 has the cylinder body 2, the piston 3, the shaft rod 119, the push rod 5, the protruding length adjusting means 6, and the connecting member 7 as main components, like the brake cylinder 1. 11 (in FIG. 11, a cross section corresponding to a state in which right and left are opposite to those in FIG. 1 is shown). However, the brake cylinder 102 is similar to the brake cylinder 101 of the second embodiment in that the rotational force applying means 118 provided as its own configuration is provided and in a part of the configuration related to the shaft rod 119. This is different from the brake cylinder 1. In the following description, components that are configured in the same manner as the brake cylinder 1 in the brake cylinder 102 and operate in the same manner are denoted by the same reference numerals in FIG. 11 as those in FIG.

  As shown in the cross-sectional view of FIG. 11, the shaft rod 119 is formed so as to have a center hole 119 a extending in parallel with the moving direction of the piston 3 at the center of the shaft. The central hole 119a is formed as a hole having a hexagonal cross section perpendicular to the axial longitudinal direction, and is formed so as to open at one end portion disposed so as to face the connecting member 7. As will be described later, the center hole 119a is configured as an engaging portion of the present embodiment that engages with the rotational force applying means 118.

  As shown in the cross-sectional view of FIG. 11, the rotational force imparting means 118 includes a rod-shaped portion 120 and a rotation operation portion 121. The rod-shaped part 120 and the rotation operation part 121 are integrally formed.

  The rod-shaped portion 120 is formed in a rod shape including a root portion 120a and a hexagonal cross-section portion 120b. The root portion 120a is formed as a round bar portion, and is formed so that one side thereof is integrated with the rotation operation unit 120 and the other side is continuous with the hexagonal cross section 120b. The hexagonal cross section 120b is formed so that a cross section perpendicular to the longitudinal direction is a hexagonal shape. And the rod-shaped part 120 is inserted in the center hole 119a from the opening provided in the end part of the axial bar 119 in the hexagonal cross section 120b. Since the center hole 119a of the shaft rod 119 is formed as a hole having a hexagonal cross section corresponding to the outer shape of the hexagonal cross section 120b, the rod-like portion 120 fitted and inserted into the center hole 119a has a circumference with respect to the center hole 119a. When it tries to rotate in the direction, it engages. That is, the center hole 119a is formed as an engaging portion in the present embodiment by having an inner surface that engages with the rod-shaped portion 120.

  The rotation operation unit 121 includes a knob part 121a and a rotary head part 121b, and a knob part 121a formed to have a hexagonal outer shape is fixed to the rotary head part 121b. The rotary head portion 121b is formed so as to have a circular outer periphery, and is integrally formed with the rod-shaped portion 120a on the side opposite to the side on which the knob portion 121a is fixed. The rotation operation unit 121 is rotatably supported in a rotation support hole 117 formed through the central portion of the connecting member 7 at an outer peripheral edge around the rotation head portion 121b. Is arranged so as to protrude outwardly from the connecting member 7. For this reason, when the knob portion 121a is manually rotated, the rotation operation portion 121 is rotated with respect to the connecting member 7, and the rod-shaped portion 120 is also rotated together with the rotation operation portion 121. That is, the rotation operation unit 121 is configured to be rotatably supported with respect to the connecting member 7 and to transmit the rotational force around the axis applied from the outside to the rod-shaped unit 120. The rotation operation unit 121 is engaged with a center hole 119 a that is an engagement portion of the shaft rod 119 via the rod-shaped portion 120. The rotation operation unit 121 does not necessarily have to be manually operated, and can be rotated using a tool such as a wrench.

  The brake cylinder 102 described above performs a braking operation in the same manner as the brake cylinder 1 of the first embodiment when compressed air is supplied from the supply / exhaust port 24, and brakes when the compressed air is discharged from the supply / exhaust port 24. The brake release operation is performed in the same manner as the cylinder 1. When the braking surface of the brake pad is worn, the protruding length of the push bar 5 is adjusted by the protruding length adjusting means 6 as in the brake cylinder 1. However, in the brake cylinder 102, when replacing the brake pad being used with the same new brake pad as before wearing, the rotational force applying means such as the socket 91 and the extension bar 92 as in the first embodiment are separately prepared. There is no need to do so, and the position of the push bar 5 in the brake released state can be returned to the initial state before being adjusted by the protruding length adjusting means 6 by the rotational force applying means 118 provided in the brake cylinder 102.

  In the brake cylinder 102, when the brake pad is replaced, the knob portion 121a of the rotation operation unit 118 exposed so as to protrude outward from the connecting member 7 is rotated in a predetermined direction. Together with 121, the rod-shaped part 120 is rotated with respect to the connecting member 7. Since the inner surface of the center hole 119a of the shaft rod 119 in which the rod-shaped portion 120 is inserted is engaged with the rod-shaped portion 120, a rotational force around the shaft acts on the shaft rod 119 as the rod-shaped portion 120 rotates. Become. As a result, a force in the pull-in direction acts on the push bar 5 whose rotation about the axis is restricted by the connecting member 7 by the action of the screws (the male screw 41 and the female screw 51). As a result, the push bar 5 can be displaced in the retracting direction against the resistance force received from the O-ring 62 disposed between the push bar 5 and the guide member 61.

  As described above, according to the brake cylinder 102 according to the present embodiment, the rotation operation unit 121 that is rotatably supported with respect to the connecting member 7 is rotated to be inserted into the center hole 119a of the shaft rod 119. The rod-shaped part 120 thus rotated can be rotated around the axis, and the push bar 5 can be moved in parallel with the moving direction of the piston 3 with respect to the axis bar 119. Further, since the rotational force applying means 118 having the rotation operation part 121 and the rod-like part 120 is provided in the brake cylinder 102, a rotational force applying means for engaging with the engaging part of the shaft bar 119 is separately prepared. There is no need, and it is possible to easily and quickly return the push rod 5 from the adjusted state to the initial state.

  Further, according to the brake cylinder 102, the central hole 119 a of the shaft rod 119 is formed to have an inner surface that engages with the rod-shaped portion 120, so that the rod-shaped portion 120 is provided in the rotational force applying means 118 provided in the brake cylinder 102. The structure of engaging with the engaging portion of the shaft rod 119 via the can be realized with a simple mechanism.

  Although the first to third embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. It can be done. For example, the present invention can be modified as follows.

  In the above-described embodiment, the air cylinder device that is driven by the air pressure is used as the cylinder device as the drive source of the brake device. However, the present invention is not limited to this, and a cylinder device that is driven by hydraulic pressure may be used. .

  Moreover, not only when the uneven surface 52 is formed on the outer peripheral surface of the push rod 5, but the outer peripheral surface is made flat and a predetermined resistance force is applied by the frictional force that the push rod 5 receives from an elastic member such as an O-ring 62. It may be configured. In this case, the processing of the outer peripheral surface of the push bar 5 is easy, and the processing cost can be reduced. Further, the surface of the push bar 5 is not limited to the case where the uneven surface 52 is formed by repeatedly arranging the unevenness in the moving direction of the push bar 5, and it is also possible to adjust the frictional force by subjecting the surface to surface treatment such as blasting. .

  Further, not only when the push bar 5 and the guide member 61 are connected via the elastic member, but when the push bar moves in parallel with the moving direction of the piston with respect to the guide member, a predetermined resistance force acts. In addition, for example, the push rod and the guide member may be coupled by a mechanical configuration such as a configuration in which the push rod moves with respect to the guide member while driving a gear mechanism having a predetermined rotational resistance.

  In addition, FIGS. 1-11 used for description of embodiment of this invention are described with the precision equivalent to a design drawing, and the ratio of each structure is exact.

It is a whole sectional view in the brake release state of the brake cylinder concerning a 1st embodiment of the present invention. FIG. 2 is an overall cross-sectional view of the brake cylinder shown in FIG. 1 in a brake operating state. FIG. 2 is an overall cross-sectional view of the brake cylinder shown in FIG. 1 in a brake operating state. FIG. 4 is an overall cross-sectional view of the brake cylinder when the brake state is shifted from the state shown in FIG. 3. It is a whole sectional view in the brake release state of a brake cylinder. It is a whole sectional view in the brake release state of a brake cylinder concerning a 2nd embodiment of the present invention. FIG. 7 is a left front view of a shaft rod in the brake cylinder shown in FIG. 6, a front view shown in a cutaway section, and a right side view. FIG. 7 is a left side view and a front view of a rod member in the brake cylinder shown in FIG. 6. It is the left view of the manual adjustment knob in the brake cylinder shown in FIG. 6, and sectional drawing seen from the front side. It is the left view of the cylindrical cover member in the brake cylinder shown in FIG. 6, and sectional drawing seen from the front side. It is a whole sectional view in the brake release state of a brake cylinder concerning a 3rd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake cylinder 2 Cylinder main body 3 Piston 4 Shaft bar 5 Push bar 6 Projection length adjustment means 7 Connecting member 8 Lid part 42 Engagement part 52 Uneven surface (projection length adjustment means)
61 Guide member (projection length adjusting means)
62 O-ring (elastic member, protrusion length adjusting means)

Claims (8)

A brake cylinder used in a vehicle brake device,
A piston that moves relative to the cylinder body when supplied with pressure fluid, a shaft rod that moves together with the piston, a push rod that is attached to the shaft rod, and the push rod in the direction of movement of the piston when the brake is released Projecting length adjusting means for adjusting the projecting length from the cylinder body when the brake is operated,
A connecting member attached to the tip of the push rod for connecting the brake mechanism of the vehicle brake device and the push rod;
With
The connecting member restrains rotation around the axis of the push rod,
The push rod is formed in a cylindrical shape having a shaft hole extending in parallel with the moving direction of the piston, and a female screw is threaded on at least a part of the inner surface of the shaft hole,
The shaft rod is engaged with a rotational force applying means for applying a rotational force around the shaft from the outside while a male screw threadedly engaged with the female screw is threaded into at least a part of the outer surface and screwed into the shaft hole. A brake cylinder having a mating engagement portion. Further comprising the rotating force applying hand stage,
The shaft rod is formed so as to have a center hole extending in parallel with the moving direction of the piston at the center of the shaft,
The rotational force applying means is a rotational operation for transmitting a rotational force about an axis applied from the outside while being rotatably supported to the connecting member and a rod-shaped portion inserted into the center hole to the rod-shaped portion. The brake cylinder according to claim 1, wherein the brake cylinder is engaged with the engagement portion via the rod-shaped portion.   The rotational force applying means is formed in a cylindrical shape provided with an engagement hole through which the rod-like portion penetrates and engages, and the engagement provided at the tip of the shaft rod in the protruding direction of the push rod The brake cylinder according to claim 2, further comprising a cylindrical lid member that engages in a state of covering the portion.   3. The brake cylinder according to claim 2, wherein the center hole is provided as the engaging portion by being formed to have an inner surface that engages with the rod-like portion.   The brake cylinder according to claim 1, wherein the engagement portion is provided at a tip end of the shaft rod in a protruding direction of the push rod. A connecting member that is attached to the tip of the push rod and connects the brake mechanism of the vehicle brake device and the push rod;
The brake according to claim 5, wherein the connecting member is formed with an opening that opens from the outside toward the engaging portion, and a lid that can open and close the opening is attached. Cylinder. The protrusion length adjusting means is
A guide member attached to the push bar and movable with the push bar;
The guide member is attached to the push rod so that a predetermined resistance acts when the push rod moves relative to the guide member in a direction parallel to the moving direction of the piston. The brake cylinder according to any one of claims 1 to 6. The protrusion length adjusting means is
An irregular surface formed by repeatedly arranging irregularities in the moving direction of the push rod on the outer surface of the push rod,
An elastic member disposed between the push rod and the guide member;
Further comprising
In the guide member, a space for opening at least the uneven surface side is formed, and the elastic member is disposed in this space,
The elastic member is deformed and engaged with the concavo-convex surface to connect the guide member and the push rod,
The said push rod is displaced with respect to the said guide member when the force more than predetermined acts on the said guide member, when the said elastic member gets over the convex part of the said uneven surface by a deformation | transformation. Brake cylinder.

Images