WO2009144863A1

WO2009144863A1 - Brake cylinder apparatus and brake caliper apparatus

Info

Publication number: WO2009144863A1
Application number: PCT/JP2009/001065
Authority: WO
Inventors: 山田浩平; 中村丈一
Original assignee: ナブテスコ株式会社
Priority date: 2008-05-29
Filing date: 2009-03-10
Publication date: 2009-12-03
Also published as: TWI365941B; TW200951320A; JP4721378B2; JPWO2009144863A1

Abstract

Enlarging of the apparatus in the axial direction is restricted, and the occurrence of operating defects in the brake release mechanism is also restricted. The components are a regular brake means (12), a push rod (13), a spring brake means (14), and a brake release mechanism (15). Brake release mechanism (15) has a piston rod (28), a ring member (29), an engaging member (30), and a holding member (31). An engaging groove (33) is formed in the side face of piston rod (28) that transmits an energizing force from spring brake means (14) to push rod (13). Multiple inclined grooves (37) are formed in concentric circles in ring member (29), which is disposed to be able to rotate on the outside, in the radial direction, of piston rod (28). Engaging member (30) is disposed in inclined grooves (37) to be able to engage in engaging groove (33). Holding member (31) holds engaging member (30) to permit movement in the radial direction and limit movement in the axial direction.

Description

Brake cylinder device and brake caliper device

A push rod for operating the vehicle brake mechanism, a service brake means, and a spring brake means are provided, and the transmission of the urging force to the push rod by the spring brake means is released to release the brake operation state to the brake non-operation state. The present invention relates to a possible brake cylinder device and a brake caliper device including the brake cylinder device.

Conventionally, as a brake cylinder device used in a vehicle brake mechanism, a brake cylinder device including a push rod for operating the brake mechanism, a regular brake means, and a spring brake means is used. The regular brake means is used during normal driving, and the spring brake means is used when the vehicle is stopped for a long time. Such a brake cylinder device is known to have a brake release mechanism capable of releasing the urging force from the spring brake means to the push rod and releasing the brake operation state to the brake non-operation state. (See Patent Document 1).

In the brake cylinder device disclosed in Patent Document 1, a tubular piston rod (10) formed integrally with the piston (9) in the spring brake means and a spring ring (around a force transmission member (6) as a push rod) 18) and a sleeve (14) arranged via each of which is provided with an annular groove (16). And, in these annular grooves (16), a fixing ring (15) formed as a ring with a slit is arranged, and via this fixing ring (15), the piston rod (10) on the spring brake means side and the push rod side The sleeve (14) is connected. The fixing ring (15) is closed by being operated via various members (control lever (24), control rod (23), fixing member (22), and fixing yoke (21)). It is comprised so that expansion to a radial direction is possible. As a result, the connection between the piston rod (10) and the sleeve (14) is released, the transmission of the urging force by the spring brake means to the push rod is released, and the brake operating state can be released to the brake non-operating state. Yes. In Patent Document 1, another embodiment other than the above is also disclosed, but in this embodiment as well, a brake release mechanism using a fixed ring as a ring with a slit is disclosed as in the above embodiment.
Japanese Unexamined Patent Publication No. 63-72926 (page 3-5, Fig. 1-3)

In the brake cylinder device disclosed in Patent Document 1, a brake release mechanism is configured using a fixing ring formed as a ring with a slit. For this reason, it is easy to realize a structure capable of transmitting the urging force of the spring brake means to the push rod and further releasing the transmission as a thin structure using the fixing ring, and the dimension is large in the axial direction of the brake cylinder device which is the brake direction. Thus, it is possible to configure a brake release mechanism that can suppress the enlargement.

However, in the brake cylinder device disclosed in Patent Document 1, the fixing ring of the brake release mechanism is formed as a ring with a slit that can be expanded and contracted in the radial direction. In some cases, the fixing ring may be twisted to cause a malfunction. That is, in the case of the brake cylinder device of Patent Document 1, the fixing ring, the piston rod (10), and the sleeve (14) may be twisted, resulting in a malfunction of the brake release mechanism. . In particular, in the brake cylinder device, since the spring force by the spring brake means is always acting, there is a possibility that the above-mentioned twist may occur due to slight distortion at the location where the fixing ring is disposed.

In view of the above circumstances, the present invention can suppress the enlargement of the device in the axial direction in a brake cylinder device including a service brake unit, a spring brake unit, and a brake release mechanism, and malfunction in the brake release mechanism. It is an object of the present invention to provide a brake cylinder device that can also suppress the occurrence of this, and to provide a brake caliper device including the brake cylinder device.

A brake cylinder device according to a first invention for achieving the above object is a brake cylinder device used in a brake mechanism for a vehicle, wherein the first spring and the first pressure chamber act in opposite directions. And the first brake moves relative to the cylinder body against the urging force of the first spring by supplying a pressure fluid to the first pressure chamber and moves in the brake direction. Means, a push rod movable with the first piston, a second spring and a second pressure chamber acting in opposite directions, and a second piston through which the push rod penetrates, and the second pressure chamber has a pressure fluid The spring that urges the push rod while the second piston moves in the brake direction by the urging force of the second spring by shifting from the state where the gas is supplied to the state where it is discharged And rake means, and a brake release mechanism for releasing the braking state to the braking inoperative state to release the transmission to the push rod of the urging force of the braking direction by the spring brake means. In the brake cylinder device according to the first aspect of the present invention, the brake release mechanism is disposed in a circular tube around the push rod, and transmits the urging force in the brake direction by the spring brake means to the push rod. A piston rod having an engagement groove formed therein, and a ring-like shape arranged so as to be rotatable with respect to the piston rod on the outer side in the radial direction, and the radial depth is changed so as to be inclined with respect to the circumferential direction. A ring member formed with a plurality of inclined grooves concentrically arranged with respect to the piston rod, an engaging member arranged in the inclined groove so as to be engageable with the engaging groove, and the second piston The piston is provided so as to move and allows the engagement member to move in a radial direction with respect to the ring member, and the piston of the engagement member relative to the ring member. To restrict the axial movement of the rod, and having a holding member for holding said engaging member.

According to this invention, the ring member is rotatably arranged on the radially outer side of the piston rod that transmits the urging force of the spring brake means to the push rod. An engaging member is disposed in the inclined groove of the ring member, and this engaging member is held by a holding member that moves together with the second piston. Further, the engaging member engages with the engaging groove of the piston rod, so that the holding member attached to the second piston and the piston rod are connected via the engaging member, and the urging force by the spring brake means is pushed by the push rod. Will be transmitted to. On the other hand, when the rotation operation of the ring member is performed, the engagement member moves along the inclined groove arranged concentrically with the piston rod in the ring member. The inclined groove is formed with the depth changed in the radial direction so as to incline with respect to the circumferential direction, and the holding member allows only the radial movement of the engaging member, so that the inclined member is inclined with the rotation of the ring member. The engagement member moves in the radial direction along the groove, and the engagement of the engagement member with the engagement groove is released. As a result, the connection between the holding member attached to the second piston and the piston rod is released, the transmission of the urging force by the spring brake means to the push rod is released, and the brake operating state is released to the brake non-operating state. become.

According to the present invention, the structure capable of transmitting the urging force of the spring brake means to the push rod and further releasing the transmission can be realized as a thin structure using the ring member, and in the axial direction of the brake cylinder device which is the brake direction It can suppress that a dimension becomes large and enlarges. Furthermore, in the brake release mechanism according to the present invention, the ring member is configured to rotate, and does not expand / contract, and the engaging member also moves in the radial direction along the inclined grooves arranged concentrically with the piston rod. Therefore, the occurrence of malfunction due to the occurrence of twisting can be suppressed.

Therefore, according to the present invention, it is possible to provide a brake cylinder device that can suppress the enlargement of the device in the axial direction and can also suppress the occurrence of malfunction in the brake release mechanism.

The brake cylinder device according to a second aspect is the brake cylinder device according to the first aspect, wherein the engagement groove extends along a circumferential direction of the piston rod and has a semicircular cross section perpendicular to the circumferential direction. The engaging member is formed as a spherical body.

According to the present invention, the engaging member formed as a spherical body engages with the engaging groove formed so as to extend along the circumferential direction with a semicircular cross section. Are more smoothly contacted, and the engaging member is easily moved along the inclined groove. For this reason, since the process which chamfers to an engaging groove can be abbreviate | omitted, a man-hour can be reduced and cost reduction can be achieved. Further, with a simple configuration of the engagement groove having a semicircular cross section and a spherical engagement member, it is possible to realize a configuration in which the piston rod is less likely to be twisted.

A brake cylinder device according to a third aspect of the present invention is the brake cylinder device according to the second aspect, wherein the engagement groove is formed so as to extend over the entire circumference on a side surface of the piston rod.

According to the present invention, since the engaging groove is formed over the entire circumference along the circumferential direction of the side surface of the piston rod, it is easy to rotate the piston rod fixed to the jig when processing the piston rod. An engagement groove can be formed on the. Since the engagement groove extends over the entire circumference of the piston rod, it can be appropriately engaged with the engagement member at any position in the circumferential direction of the piston rod. Arrangement work becomes easy. For this reason, processing man-hours and assembly man-hours can be reduced, and further cost reduction can be achieved.

A brake cylinder device according to a fourth invention is the brake cylinder device according to any one of the first to third inventions, comprising an operation unit for rotating the ring member, wherein the ring member is formed in a ring shape. A protrusion is provided so as to protrude and extend from the ring main body in the radial direction, and the operation unit includes a shaft-shaped member that moves so as to be linked to the protrusion, and the shaft-shaped member moves. Thus, the ring member is rotated so that the protruding portion extends and the surface on which the shaft-shaped member moves is the same surface as the surface on which the ring main body portion is disposed. It is characterized by being.

According to the present invention, the shaft member of the operation unit and the protruding portion of the ring member are disposed on the same surface as the surface on which the ring body portion is disposed. For this reason, the shaft-like member and the projecting portion, which are the configurations for realizing the rotation operation of the ring member, are also arranged on the same plane as the ring main body portion, and the brake cylinder device is enlarged in the axial direction. Further suppression can be achieved.

A brake cylinder device according to a fifth aspect of the present invention is the brake cylinder device according to the fourth aspect of the present invention, wherein the operation unit is maintained in a state where the engagement member is engaged with the engagement groove by the inclined groove. Spring means for generating an urging force for urging the protrusion is provided, and the surface on which the spring means is arranged to be elastically deformed is the same surface as the surface on which the ring main body is arranged. It is characterized by that.

According to the present invention, the spring means of the operation unit that generates the urging force that urges the protruding portion so that the engagement state of the engagement member with the engagement groove is maintained is also arranged on the same plane as the ring main body portion. It will be. For this reason, it can further suppress that the brake cylinder device enlarges in the axial direction.

A brake cylinder device according to a sixth aspect of the present invention is the brake cylinder device according to any one of the first to fifth aspects of the present invention, wherein the holding member is disposed on both sides in the axial direction of the piston rod with respect to the ring member. A plurality of wall portions that are provided along the circumferential direction of the ring member and that are formed so as to protrude from at least one of the pair of flat plate members. A path is formed that allows the combined member to move in the radial direction relative to the ring member.

According to the present invention, the holding member is constituted by a pair of flat plate-like members provided with at least one of the wall portions arranged along the circumferential direction. For this reason, the movement of the piston rod in the axial direction relative to the ring member of the engaging member is restricted by the pair of flat plate-like members. And the movement of the radial direction with respect to the ring member of an engaging member is accept | permitted by the path | route formed by a some wall part. For this reason, the holding member that allows only the radial movement of the engagement member relative to the ring member can be realized with a simple configuration. And since a holding member of a thin structure can be realized by a pair of flat members, it is possible to further prevent the brake cylinder device from being enlarged in the axial direction.

Further, as another aspect of the invention, an invention of a brake caliper device including any one of the above-described brake cylinder devices can be configured. That is, a brake caliper device according to a seventh aspect of the present invention is equipped with the brake cylinder device of any one of the first to sixth aspects of the invention and the brake cylinder device, and can move relative to the vehicle carriage in the axle direction. A caliper body mounted in such a manner that a braking force is generated by sandwiching an axle-side disk by a pair of brake members attached to the caliper body by operating the brake cylinder device. .

According to the present invention, the brake cylinder is provided with the service brake means, the spring brake means, and the brake release mechanism, and can prevent the device from being enlarged in the axial direction, and can also suppress the occurrence of malfunction in the brake release mechanism. A brake caliper device including the device can be realized.

ADVANTAGE OF THE INVENTION According to this invention, it can suppress that an apparatus enlarges to an axial direction, can provide the brake cylinder apparatus which can also suppress generation | occurrence | production of the malfunction in a brake release mechanism, and also provides the brake cylinder apparatus. A brake caliper device can be provided.

It is the schematic which looked at the brake caliper device concerning one embodiment of the present invention from the axle direction. It is sectional drawing in the axle shaft direction of the brake cylinder apparatus which concerns on one embodiment of this invention. It is sectional drawing explaining the action | operation of the brake cylinder apparatus shown in FIG. It is sectional drawing explaining the action | operation of the brake cylinder apparatus shown in FIG. It is a figure which expands and shows a part of brake release mechanism in the brake cylinder apparatus shown in FIG. FIG. 6 is a cross-sectional view taken along line BB in FIG. 5. It is a top view which shows the ring member in the brake release mechanism shown in FIG. It is a top view which shows the frame member in the holding member of the brake release mechanism shown in FIG. It is CC sectional view taken on the line of FIG. It is sectional drawing explaining the force which acts on the engaging member in the brake release mechanism shown in FIG. It is a figure explaining the state by which the operation of the operation unit in the brake release mechanism shown in FIG. 5 was performed. FIG. 12 is a cross-sectional view taken along line EE in FIG. 11. It is sectional drawing explaining the action | operation of the brake cylinder apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake cylinder apparatus 11 Cylinder main body 12 Service brake means 13 Push rod 14 Spring brake means 15 Brake release mechanism 18 1st spring 19 1st pressure chamber 20 1st piston 24 2nd spring 25 2nd pressure chamber 26 2nd piston 28 Piston rod 29 Ring member 30 Engaging member 31 Holding member 33 Engaging groove 37 Inclined groove

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. A brake cylinder device according to an embodiment of the present invention and a brake caliper device including the brake cylinder device will be described by taking as an example a case of being used in a brake mechanism for a railway vehicle. The present invention is not limited to a brake mechanism for a railway vehicle, and can be widely applied to a brake mechanism for a vehicle.

(Configuration of brake caliper device)
First, a brake caliper device for a railway vehicle according to an embodiment of the present invention will be described. Note that the brake caliper device according to the present embodiment is configured as a brake mechanism for a railway vehicle in which the brake cylinder device according to the embodiment of the present invention is used. FIG. 1 is a schematic view of the brake cylinder device 1 according to the present embodiment and the brake caliper device 100 according to the present embodiment as viewed from a direction parallel to the axle direction. As shown in FIG. 1, the brake caliper device 100 is provided as a disc brake type brake mechanism.

A brake caliper device 100 shown in FIG. 1 includes a brake cylinder device 1, a caliper body 102 equipped with the brake cylinder device 1 and attached so as to be capable of relative movement in an axle direction with respect to a vehicle carriage 101. A pair of back plates (branch holder holding portions) 103 and 103 that respectively hold the brake pads (branches) 104 and 104 are configured.

When the brake cylinder device 1 is operated, the brake caliper device 100 has a pair of

brake pads

104 and 104 attached to the caliper body 102 via the back plate 103, so that the wheels (not shown) of the railcar are installed. A disc-shaped brake disc 105 (illustrated by a two-dot chain line) that is an axle-side disc that rotates in conjunction with the rotation is sandwiched to generate a braking force. That is, the brake disc 105 is formed in a disc shape having front and back braking

surfaces

105a and 105a formed so as to be orthogonal to the rotation axis, and when the brake cylinder device 1 is operated, the

brake pads

104 and 104 are moved. The

brake discs

105a and 105a are pressed against both sides of the brake disc 105 from both sides in a direction substantially parallel to the rotation axis direction of the brake disc 105 (that is, the axle direction).

As shown in FIG. 1, the caliper body 102 includes a coupling member 106 and a pair of brake levers 107 and 107. The coupling member 106 is attached to a bracket 101a fixed to the bottom surface of the carriage 101 via a swing pin 106a so as to be swingable about an axis parallel to the traveling direction of the vehicle. A pair of brake levers 107 and 107 are installed so as to be swingable with respect to the coupling member 106 via a pair of fulcrum pins 107a. The fulcrum pin 107a is installed so as to extend in a direction perpendicular to the axial direction of the swing pin 106a when viewed from a direction parallel to the axle direction as shown in FIG.

The brake cylinder device 1 is attached to one end side of the pair of brake levers 107 and 107 via a cylinder support pin 107b, and one end side is driven by the brake cylinder device 1. The pair of brake levers 107 and 107 are respectively attached with a pair of

back plates

103 and 103 holding the brake pad 104 on the other end side via a fulcrum pin 107a with respect to one end side to which the brake cylinder device 1 is attached. It has been. The back plate 103 is swingably attached to the brake lever 107 via a support pin 103a extending in parallel with the fulcrum pin 107a. A parallel guide mechanism 108 including a pair of guide members and a pair of guide rods is disposed below the brake lever 107. By this parallel guide mechanism 108, the brake cylinder device 1 is activated and the brake lever 107 swings so that the pair of

brake pads

104, 104 move together with the back plate 103 (in a direction in contact with the brake disc 105). In this case, the pair of

brake pads

104, 104 are guided so as to substantially maintain their parallel surfaces with the brake disc 105 interposed therebetween.

(Brake caliper device operation)
In the brake caliper device 100 described above, the cylinder body 11 side of the brake cylinder device 1 is attached to one brake lever 107 and the push rod 13 is attached to the other brake lever 107, as will be described later. Thus, the push bar 13 is projected or retracted. Accordingly, the vicinity of the cylinder support pin 107b of the pair of brake levers 107 and 107 is driven so as to be separated from each other or close to each other. Therefore, the pair of brake levers 107 and 107 operate with the fulcrum pin 107 a as a support shaft, and operate so as to sandwich the brake disc 105 between the brake pads 104. At this time, in the pair of brake levers 107 and 107, the brake pad 104 provided on one brake lever 107 comes into contact with the braking surface 105a of the brake disc 105 first. Then, the other brake lever 107 presses the brake pad 104 against the braking surface 105a of the brake disc 105 using a reaction force received from the brake pad 104 that contacts the braking surface 105a. As a result, the brake disc 105 is sandwiched between the pair of

brake pads

104, 104, and the rotation of the brake disc 105 is braked by the frictional force generated between the

brake pads

104, 104 and the

braking surfaces

105a, 105a. The rotation of the wheels of the railway vehicle provided coaxially with the brake is braked.

(Brake cylinder device overall configuration)
Next, the brake cylinder device 1 according to the present embodiment will be described. Both ends of the brake cylinder device 1 in the brake operation direction are connected to the cylinder support pins 107b, respectively, and the brake cylinder device 1 is arranged so that the axial direction of the brake cylinder device 1 is positioned in parallel with the axle direction. As shown in FIG. 2, which is a sectional view in the axial direction of the brake cylinder device 1, the brake cylinder device 1 includes a cylinder body 11, a service brake means 12, a push rod 13, a spring brake means 14, a brake release mechanism 15, and the like. It is configured with.

As shown in FIG. 2, the cylinder body 11 is composed of a first casing portion 16 and a second casing portion 17, and forms an internal space 11a. In this internal space 11a, it arrange | positions so that some or all of each component, such as the service brake means 12, the push rod 13, the spring brake means 14, and the brake release mechanism 15, may be accommodated. Moreover, the 1st casing part 16 becomes a substantially cup shape (cylinder shape) which has a bottom part, and the 2nd casing part 17 is being fixed with the volt | bolt so that the open side of this 1st casing part 16 may be closed. As a result, an internal space 11a is formed. Further, the end portion of the first casing portion 16 is connected to the brake lever 107 by a cylinder support pin 107b.

(Configuration of regular brake means)
As shown in FIG. 2, the service brake means 12 includes a first spring 18, a first pressure chamber 19, and a first piston 20 as main components. The first piston 20 is disposed so as to partition the internal space 11 a, and is airtightly fitted to the inner peripheral surface of the first casing portion 16, and the axial direction of the brake cylinder device 1 with respect to the first casing portion 16. Are slidably disposed on the surface. A first pressure chamber 19 is configured by a space partitioned by the first piston 20 and the first casing portion 16. The cylinder body 11 is provided with a pressure fluid passage (not shown) communicating with the first pressure chamber 19, and the first pressure of the compressed air as the pressure fluid as the working fluid is provided through the pressure fluid passage. Supply and discharge to the chamber 19 are performed.

The first spring 18 is provided as a coil spring disposed on the opposite side of the internal space 11a with respect to the first pressure chamber 19 via the first piston 20, and is moved toward the first pressure chamber 19 side. It arrange | positions so that 1 piston 20 may be urged | biased. FIG. 3 is a cross-sectional view in the axial direction of the brake cylinder device 1 showing a state where the service brake means 12 is activated and the brake caliper device 100 performs a braking operation. By providing the above-described configuration, as shown in FIGS. 2 and 3, the service brake means 12 is such that the first spring 18 and the first pressure chamber 19 act against the first piston 20 in the opposite direction, When compressed air is supplied to the first pressure chamber 19, the first piston 20 moves relative to the cylinder body 11 against the biasing force of the first spring 18, and the brake direction (the direction of arrow A in FIG. 3). ) Is configured to move.

(Configuration of push rod)
As shown in FIGS. 2 and 3, the push rod 13 is configured as a round bar-shaped member. The push bar 13 is arranged so as to penetrate a spring brake means 14 described later, and is arranged so that the axial direction of the push bar 13 coincides with the axial direction of the brake cylinder device 1. Further, the push rod 13 is connected at one end to the cylinder support pin 107b of the brake lever 107 via the connecting member 21 (see FIG. 1), and the other end is connected to the central portion of the first piston 20. It is fixed against. Thereby, the push rod 13 is configured to be movable together with the first piston 20, and can transmit the driving force by the brake cylinder device 1 to the brake lever 107. Further, a stop ring 22 is attached to the outer periphery of one end side of the push rod 13, and the push rod 13 and an end portion on one end side of a piston rod 28 to be described later are locked through the stop ring 22. ing. A flexible bellows cover 23 for dust prevention is provided on one end side of the push bar 13 protruding from the spring brake means 14.

(Configuration of spring brake means)
As shown in FIG. 2, the spring brake means 14 includes a second spring 24, a second pressure chamber 25, and a second piston 26 as main components. The second piston 26 includes a cylindrical portion 26a configured as a cylindrical body, and flange-shaped

portions

26b and 26c provided so as to protrude outward at both ends of the cylindrical portion 26a. The push rod 13 is disposed so as to penetrate the inside of the cylindrical portion 26a via a piston rod 28 described later. The flange-shaped portion 26 b is disposed on one end side of the push rod 13, and the flange-shaped portion 26 c is disposed on the other end side of the push rod 13. The second casing portion 17 is provided with a spring seat portion 17a that projects inwardly along the inner periphery of the second casing portion 17 and constitutes a base for the second spring 24. The inner peripheral end of the spring seat portion 17a is in airtight sliding contact with the outer periphery of the cylindrical portion 26a of the second piston 26, and the second piston 26 is slidable in the axial direction with respect to the second casing portion 17. It is arranged.

The second pressure chamber 25 is constituted by a space partitioned by the outer periphery of the cylindrical portion 26a and the flange-shaped portion 26c of the second piston 26, the inner periphery of the second casing portion 17, and the spring seat portion 17a. The second casing portion 17 is provided with a pressure fluid passage (not shown) communicating with the second pressure chamber 25, and the second pressure chamber 25 for compressed air (pressure fluid) is provided through the pressure fluid passage. Supply and discharge are performed.

The second spring 24 is provided as a coil spring disposed around the cylindrical portion 26a of the second piston 26, and is disposed between the spring seat portion 17a and the flange-shaped portion 26b. FIG. 4 is a sectional view in the axial direction of the brake cylinder device 1 showing a state in which the spring brake means 14 is operated. As shown in FIGS. 2 to 4, the second spring 24 has a flange-like portion 26b with respect to the spring seat portion 17a (that is, the second piston 26 with respect to the cylinder body 11) in the braking direction (in FIG. 4). Arranged so as to be biased in the direction of arrow A). The spring brake means 14 is discharged from a state in which the second spring 24 and the second pressure chamber 25 act on the second piston 26 in the opposite directions and compressed air is supplied to the second pressure chamber 25. The second piston 26 is configured to move in the braking direction by the urging force of the second spring 24 by shifting to. Further, as will be described later, the spring brake means 14 is configured to urge the push rod 13 via the brake release mechanism 15 when the second piston 26 moves in the brake direction. A flexible bellows cover 27 for dust prevention is installed between the outer peripheral portion on one end side of the second casing portion 17 and the outer peripheral portion of the flange-shaped portion 26b of the second piston 26.

(Brake release mechanism configuration)
The brake release mechanism 15 is provided as a mechanism capable of releasing the brake operation state to the brake non-operation state by releasing the transmission of the urging force in the brake direction to the push rod 13 by the spring brake means 14. As shown in FIGS. 1 to 4, the brake release mechanism 15 includes a piston rod 28, a ring member 29, an engagement member 30, a holding member 31, and an operation unit 32 as main components.

As shown in FIG. 2, the piston rod 28 is formed as a cylindrical member, and is arranged in a circular tube around the push rod 13. And the piston rod 28 is arrange | positioned so that the outer peripheral surface of the push rod 13 may be slidably contacted in the internal peripheral surface. The piston rod 28 is arranged such that its axial direction coincides with the axial direction of the brake cylinder device 1 and the axial direction of the push rod 13. Further, the piston rod 28 is provided with an engagement groove 33 formed on the side surface and a step 34 formed on the end portion on one end side.

FIG. 5 is an enlarged view of a part of the brake release mechanism 15 as seen from a direction parallel to the axle direction, and FIG. 6 is a cross-sectional view taken along the line BB in FIG. In addition, in FIG. 6, except piston rod 28 is shown as sectional drawing. As shown in FIGS. 2, 5, and 6, the engagement groove 33 is formed so as to extend along the circumferential direction of the piston rod 28 and to have a semicircular cross section perpendicular to the circumferential direction. The engagement groove 33 is formed on the side surface of the piston rod 28 so as to extend over the entire circumference. As shown in FIGS. 2 and 5, the step portion 34 is formed by denting the inner peripheral side of the end portion on one end side of the piston rod 28 in a step shape over the entire circumference. The step 34 is provided at a position where it abuts against the stop ring 22 attached to the push bar 13. Thus, by providing the step portion 34 to be engaged with the retaining ring 22, the piston rod 28 is configured to be able to transmit the urging force in the braking direction by the spring brake means 14 to the push rod 13. ing.

FIG. 7 is a plan view showing the ring member 29. As shown in FIGS. 2 and 5 to 7, the ring member 29 is disposed in a ring shape so as to be rotatable on the outer side in the radial direction with respect to the piston rod 28, and a ring main body portion 35 and a protruding portion 36 are formed. Has been. The ring body portion 35 is formed in a flat ring shape having a large through hole through which the piston rod 28 penetrates in the center, and the protrusion portion 36 is provided so as to protrude and extend radially outward from the ring body portion 35. ing.

Further, a plurality of inclined grooves 37 are formed in the ring member 29 along the inner periphery of the ring main body 35. The inclined groove 37 is formed so as to be concentrically arranged with respect to the piston rod 28 arranged inside the ring main body 35. The inclined groove 37 is formed so that the depth direction thereof is a direction toward the radially outer side of the ring main body 35. For example, the inner periphery of the ring main body 35 in a state where the inclined groove 37 is not formed. It is formed by processing so as to be cut out radially outward with respect to the surface (indicated by a two-dot chain line P in FIG. 7). The inclined groove 37 is formed so that the depth in the radial direction changes so as to be inclined with respect to the circumferential direction of the ring main body portion 35.

As shown in FIGS. 2 and 5 to 7, the engaging member 30 is formed as a spherical body, and a plurality of engaging members 30 are provided corresponding to the respective inclined grooves 37. The engagement member 30 is disposed between the ring member 29 and the piston rod 28, and is disposed with respect to the inclined groove 37 of the ring member 29 so as to be engageable with the engagement groove 33 of the piston rod 28. Yes. 5 and 7, the shape of the inclined groove 37 with respect to the circumferential direction of the ring body 35 is formed as a part of an arc corresponding to the outer shape of the engaging member 30 at the deepest part. The form currently formed in linear form in this part is illustrated. However, the inclined groove 37 does not necessarily have to be formed in this shape, and can be formed by changing as appropriate.

As shown in FIGS. 2, 5, and 6, the holding member 31 is provided as a member for holding the engaging member 30, and is disposed on both sides in the axial direction of the piston rod 28 with respect to the ring member 29. It is provided as a pair of flat members. The pair of flat plate members in the holding member 31 are disposed on the side opposite to the second piston 26 side with respect to the ring member 29 and the frame member 38 disposed on the second piston 26 side with respect to the ring member 29. The holding member 39 is constituted. In FIG. 5, only the frame member 38 of the holding member 31 is illustrated.

8 is a plan view of the frame member 38, and FIG. 9 is a sectional view taken along the line CC in FIG. As shown well in FIGS. 8 and 9, the frame member 38 is formed with a recess 40, a piston rod hole 45, a wall 43, and the like. The concave portion 40 is formed as a circular concave portion, and is formed continuously with the first concave portion 41 and the first concave portion 41 that is rotatably arranged in a state where the ring main body portion 35 of the ring member 29 is in sliding contact. It is comprised with the 2nd recessed part 42 which divides the substantially rectangular space extended to radial direction. The protrusion 36 of the ring member 29 is disposed in the second recess 42, and when the ring member 29 rotates, the protrusion 36 swings in the space defined by the second recess 42.

The piston rod hole 45 is formed as a circular through hole having a diameter corresponding to the outer shape of the piston rod 28. The piston rod 28 is disposed so as to penetrate the piston rod hole 45. A plurality of wall portions 43 are arranged along the circumferential direction of the ring member 29 arranged in the first recess 42, and are formed so as to protrude from the frame member 38. That is, each wall 43 is formed so as to protrude from the surface on which the first recess 41 is disposed. And between each wall part 43, the radial direction path | route 44 extended in the radial direction of the ring member 29 arrange | positioned at the 1st recessed part 41 toward the 1st recessed part 41 from the hole 45 for piston rods is formed. Yes. As described above, by providing the plurality of wall portions 43, the radial path 44 that allows the radial movement of the engaging member 30 held by the holding member 31 relative to the ring member 29 is formed. ing. The frame member 38 is formed with an insertion hole 46 into which a shaft-like member 47 in the operation unit 32 described later is reciprocally inserted. The insertion hole 46 is formed so as to communicate with the space defined by the second recess 42.

As shown in FIGS. 2 and 6, the pressing member 39 in the holding member 31 is disposed so as to be overlapped with the frame member 38, and the ring member 29 can be rotated between the frame member 38 and the holding member 31. It is arranged so as to be sandwiched between and supported. Then, the engaging member 30 is disposed between the frame member 38 and the pressing member 39, whereby the engaging member 30 is held by the holding member 31. Further, the pressing member 39 is fixed to the flange-shaped portion 26b of the second piston 26 together with the frame member 38 by, for example, a bolt, so that the holding member 31 moves together with the second piston 26.

As described above, the holding member 31 holds the engaging member 30 between the frame member 38 that is a pair of flat plate members and the pressing member 39, whereby the piston rod 28 with respect to the ring member 29 of the engaging member 30. The movement in the axial direction is restricted. Further, the holding member 31 allows the engagement member 30 to move in the radial direction with respect to the ring member 29 by holding the engagement member 30 so as to be able to pass through the radial path 44 formed by the plurality of wall portions 43. It is configured as follows.

As shown in FIG. 5, the operation unit 32 includes a shaft-like member 47, a spring means 48, and an attachment member 49, and is provided as a mechanism for rotating the ring member 29. In FIG. 5, the spring means 48 is schematically shown in a cross-sectional state.

The shaft-like member 47 is formed in a stepped round bar shape, a small-diameter round bar-like operation part 50 is formed on one end side, and a round bar-like linkage larger in diameter than the operation part 50 is formed on the other end side. A part 51 is formed. The operation unit 50 and the linking unit 51 are integrally formed in series and are formed to extend on the same straight line. The linking portion 51 is inserted into the insertion hole 46 of the frame member 38 and is disposed so as to be reciprocally movable in the insertion hole 46. And the front end side of the link part 51 is arrange | positioned so that the protrusion part 36 of the ring member 29 may contact | abut, and it is comprised so that it may operate | move in connection with the protrusion part 36 so that it may mention later. On the other hand, the operation unit 50 is provided as a knob portion for operation for manual operation, and is disposed so as to protrude from the frame member 38.

The attachment member 49 is formed by bending a plate-like member substantially at a right angle, and is fixed to the frame member 38 with, for example, a bolt and attached in a cantilever state. A through hole 49a is formed in a bent portion provided on the free end side of the attachment member 49 opposite to the side fixed to the frame member 38, and the operating portion 50 of the shaft-like member 47 is formed in the through hole 49a. It is arrange | positioned so that it may penetrate.

The spring means 48 is formed as a coil spring, and is arranged so that the operation part 50 of the shaft-like member 47 is inserted in the center thereof. The spring means 48 is supported with its end on one end abutting against the bent portion of the mounting member 49, and the other end on the end of the shaft member 47 from the operation portion 50 to the linkage portion 51. It is supported in contact with a stepped portion that expands in a step shape. By arranging the spring means 48 in this way, in the operation unit 32, the urging force due to the spring force of the spring means 48 moves the linkage portion 51 of the shaft-like member 47 to the back side of the insertion hole 46 of the frame member 38. It is configured to bias in the direction of deep insertion.

Here, the operation when the ring member 29 is rotated by the operation unit 32 will be described. FIG. 10 is a cross-sectional view for explaining the force acting on the engagement member 30, and shows a cross section in the vicinity of the engagement member 30 in the cross-sectional view of FIG. 10 shows a cross section in the vicinity of the engaging member 30 whose cross section is shown on the lower side in FIG. 6, and the piston rod 28 is also shown in a cross-sectional state. In a state where the spring brake means 14 is activated and the engagement member 30 is engaged with the engagement groove 33, the urging force of the second spring 24 is applied to the frame member 38 via the flange-shaped portion 26 b of the second piston 26. As shown in FIG. 10, a force Fa acts on the engaging member 30 from the frame member 38 in the direction indicated by the arrow in the figure. For this reason, from the engagement groove 33 of the piston rod 28 with which the engagement member 30 is engaged, the force Fb having an axial force component that balances the force Fa is applied in the direction indicated by the arrow in the figure. It works. A force Fc that balances the force component in the radial direction of the force Fb acts on the engaging member 30 from the inclined groove 37 of the ring member 29 with which the engaging member 30 contacts. . It should be noted that a relationship of action and reaction is established between the force Fc and the radial force Fd in which the engaging member 30 presses the inclined groove 37 of the ring member 29 as indicated by an arrow in the figure.

As described above, various forces (Fa, Fb, Fc) generated based on the urging force from the second spring 24 are acting on the engaging member 30, and against the inclined groove 37 of the ring member 29. Thus, a radial force Fd from the engaging member 30 is applied. Therefore, the ring member 29 rotatably supported by the holding member 31 is urged in the rotation direction indicated by the arrow D in FIG. 5 by the force Fd that the engagement member 30 presses the inclined groove 37. On the other hand, as shown in FIG. 5, in the operation unit 32, the shaft-like member 47 is urged by the spring means 48, whereby the linkage portion 51 comes into contact with the protruding portion 36 and the ring member 29. Is urged to rotate in a direction opposite to the rotation direction indicated by arrow D. For this reason, a force toward the center side in the radial direction acts on the engaging member 30 from the inclined groove 37 of the ring member 29. Thereby, the radial force Fc shown in FIG. 10 acts on the engaging member 30, and the state in which the engaging member 30 is engaged with the engaging groove 33 is maintained, and the ring member is located at the position shown in FIG. 29 will be located. That is, the spring means 48 is configured to generate a biasing force that biases the protruding portion 36 so that the state in which the engaging member 30 is engaged with the engaging groove 33 by the inclined groove 37 is maintained. .

FIG. 11 is a diagram for explaining a state in which the operation unit 32 is operated, and corresponds to FIG. As shown in FIG. 11, when an operator (not shown) grips the operation unit 50 with a finger or a hand and operates the operation unit 32 so as to pull the operation unit 50 in the direction of arrow F in the figure, the shaft-shaped member 47 is pulled in the direction F in the figure against the spring force of the spring means 48, and the linking part 51 also moves in the direction of the arrow F. As a result, the urging force for urging the projecting portion 36 by the linkage portion 51 is weakened, so that the engaging member 30 is urged by the force Fd for urging the inclined groove 37 based on the spring force of the second spring 24 (see FIG. 10). As shown in FIG. 11, the ring member 29 rotates in the rotation direction indicated by the arrow D. As described above, the shaft-shaped member 47 moves so as to be linked to the protruding portion 36, and the ring-shaped member 29 is rotated by the movement of the shaft-shaped member 47.

When the ring member 29 is rotated as described above, the engagement member 30 moves along the radial path 44 formed between the wall portions 43 of the frame member 38 as the ring member 29 rotates. It moves toward the outer side in the radial direction. As described above, the ring member 29 rotates in accordance with the operation of the operation unit 32 and the engagement member 30 moves in the radial direction, so that the engagement of the engagement member 30 with the engagement groove 33 of the piston rod 28 is performed. It will be released.

FIG. 12 is a cross-sectional view taken along the line EE in FIG. 11, and corresponds to FIG. 13 shows the state in which the brake operating state shown in FIG. 4 in which the spring brake means 14 is operating is released to the brake non-operating state by the operation of the brake releasing mechanism 15 in the axial direction of the brake cylinder device 1. It is sectional drawing. As described above, when the engagement of the engagement member 30 with the engagement groove 33 is released, the connection of the piston rod 28 to the holding member 31 via the engagement member 30 is released in the brake release mechanism 15. Will be. For this reason, the urging force in the braking direction by the spring brake means 14 is not transmitted to the push rod 13 via the piston rod 28. Then, as shown in FIGS. 12 and 13, the push rod 13 moves together with the first piston 20 in the direction opposite to the brake direction by the biasing force of the first spring 18 of the service brake means 12, and the piston rod 28 also moves the stop ring 22. It moves together with the push bar 13 via. Thus, when the operation unit 32 in the brake release mechanism 15 is operated, the transmission of the urging force in the brake direction to the push rod 13 by the spring brake means 14 is released, and the brake operation state is changed to the brake non-operation state (FIG. 13). In the state shown in FIG.

As shown in FIG. 5, the brake release mechanism 15 described above is arranged so that the protruding portion 36 of the ring member 29 extends and the shaft-like member 47 of the operation unit 32 is arranged to move. However, it is comprised so that it may become the same surface as the surface where the ring main-body part 35 of the ring member 29 is arrange | positioned. Further, in this brake release mechanism 15, the surface on which the spring means 48 of the operation unit 32 is arranged to be elastically deformed is also configured to be the same surface as the surface on which the ring main body portion 35 is arranged. ing.

(Brake cylinder device operation)
Next, the operation of the brake cylinder device 1 described above will be described. In the state shown in FIG. 2 in which neither the service brake means 12 nor the spring brake means 14 is operating, when a predetermined valve (not shown) is controlled and compressed air is supplied to the first pressure chamber 19, FIG. As shown, the push rod 13 moves in the braking direction (in the direction of arrow A in the figure) together with the first piston 20, and the brake caliper device 1 operates to perform the braking operation (see FIG. 1). On the other hand, when the compressed air is discharged from the first pressure chamber 19, the position of the push rod 13 together with the first piston 20 returns to the state shown in FIG. 2 by the urging force of the first spring 18, and the braking force in the brake caliper device 100 is increased. It will be released.

In addition, as shown in FIG. 3, when the braking force by the service brake means 12 is exerted and the vehicle is shifted from the stopped state to the parking state as it is, a predetermined valve (FIG. (Not shown) is controlled, and the compressed air enclosed in the second pressure chamber 25 is discharged. As a result, the action of the second pressure chamber 25 resisting the biasing force of the second spring 24 is released, and the second piston 26 is moved in the direction of arrow A by the biasing force of the second spring 24 as shown in FIG. Moving. At this time, in the brake release mechanism 15, since the engagement member 30 is engaged with the engagement groove 33 of the piston rod 28, the piston rod 28 also moves together with the second piston 26, and the step portion 34 of the piston rod 28. Is brought into contact with the retaining ring 22 so that the urging force of the second piston 26 is transmitted to the push rod 13. In this state, even if the service brake means 12 is released, that is, the compressed air supplied to the first pressure chamber 19 is discharged, the push rod 13 is urged by the spring brake means 14 and the braking force is exerted. Will be maintained.

Further, in a state where the vehicle is parked and the spring brake means 14 is operating as shown in FIG. 4, it is necessary to move the vehicle and the operation of the spring brake means 14 is manually released to change the brake operating state. When releasing the brake to the non-operating state, the operation of the operation unit 32 in the brake release mechanism 15 is performed. That is, as shown in FIG. 11, when the operation portion 50 is pulled, the ring member 29 is rotated and the engagement of the engagement member 30 with the engagement groove 33 is released. As a result, as shown in FIG. 13, the push rod 13 moves together with the piston rod 28 in the direction opposite to the brake direction by the urging force of the first spring 18, and is released to the brake non-operating state.

(Effects of brake cylinder device and brake caliper device)
According to the brake cylinder device 1 described above, the ring member 29 is rotatably arranged on the radially outer side of the piston rod 28 that transmits the urging force of the spring brake means 14 to the push rod 13. The engaging member 30 is disposed in the inclined groove 37 of the ring member 29, and the engaging member 30 is held by a holding member 31 that moves together with the second piston 26. Further, the engaging member 30 is engaged with the engaging groove 33 of the piston rod 28, whereby the holding member 31 attached to the second piston 26 and the piston rod 28 are connected via the engaging member 30, and the spring The urging force by the brake means 14 is transmitted to the push rod 13. On the other hand, when the rotation operation of the ring member 29 is performed, the engagement member 30 moves along the inclined groove 37 disposed concentrically with the piston rod 28 in the ring member 29. The inclined groove 37 is formed so that the depth thereof is changed in the radial direction so as to be inclined with respect to the circumferential direction, and the holding member 31 allows only the radial movement of the engaging member 30. With the rotation, the engaging member 30 moves in the radial direction along the inclined groove 37, and the engagement of the engaging member 30 with the engaging groove 33 is released. Thereby, the connection between the holding member 31 attached to the second piston 26 and the piston rod 28 is released, the transmission of the urging force to the push rod 13 by the spring brake means 14 is released, and the brake operating state is the brake non-operating state. Will be released.

According to the brake cylinder device 1, the structure capable of transmitting the urging force of the spring brake means 14 to the push rod 13 and releasing this transmission can be realized as a thin structure using the ring member 29. It can suppress that a dimension becomes large in the direction and enlarges. Further, in the brake release mechanism 15, the ring member 29 is configured to perform a rotation operation, and does not perform an expansion / contraction operation, and the engagement member 30 is also radial along the inclined groove 37 disposed concentrically with the piston rod 28. Therefore, the occurrence of malfunction due to twisting can be suppressed.

Therefore, according to the brake cylinder device 1, the device can be prevented from being enlarged in the axial direction, and the occurrence of malfunction in the brake release mechanism 15 can also be suppressed.

Further, according to the brake cylinder device 1, the engagement member 30 formed as a spherical body engages with the engagement groove 33 formed so as to extend along the circumferential direction with a semicircular cross section. The groove 33 and the engaging member 30 come into contact more smoothly, and the engaging member 30 can easily move along the inclined groove 37. For this reason, since the process which chamfers to the engagement groove | channel 33 can be abbreviate | omitted, a man-hour can be reduced and cost reduction can be achieved. In addition, a simple configuration of the engagement groove 33 having a semicircular cross section and the spherical engagement member 30 can realize a configuration in which the piston rod 28 is less likely to be twisted.

Further, according to the brake cylinder device 1, since the engaging groove 33 is formed over the entire circumference along the circumferential direction of the side surface of the piston rod 28, it is fixed to the jig when the piston rod 28 is processed. The engaging groove 33 can be easily formed while rotating the piston rod 28. Since the engagement groove 33 extends over the entire circumference of the piston rod 28, the engagement member 30 can be properly engaged with the engagement member 30 at any position in the circumferential direction of the piston rod 28. The arrangement work of the piston rod 28 is facilitated. For this reason, processing man-hours and assembly man-hours can be reduced, and further cost reduction can be achieved.

Further, according to the brake cylinder device 1, the shaft-like member 47 of the operation unit 32 and the protruding portion 36 of the ring member 29 are disposed on the same surface as the surface on which the ring main body portion 35 is disposed. For this reason, the shaft-shaped member 47 and the projecting portion 36 which are configurations for realizing the rotation operation of the ring member 29 are also arranged on the same plane as the ring main body portion 35, and the brake cylinder device 1 is enlarged in the axial direction. Can be further suppressed.

Further, according to the brake cylinder device 1, the spring means 48 of the operation unit 32 that generates a biasing force that biases the protrusion 36 so that the engagement state of the engagement member 30 with the engagement groove 33 is maintained. It will be arranged on the same plane as the main body 35. For this reason, it can further suppress that the brake cylinder device 1 enlarges in the axial direction.

Further, according to the brake cylinder device 1, the holding member 31 is constituted by a pair of flat plate members (38, 39) each having a wall portion 43 disposed along the circumferential direction. For this reason, the axial movement of the piston rod 28 with respect to the ring member 29 of the engagement member 30 is restricted by the pair of flat members (38, 39). Further, the radial path 44 formed by the plurality of wall portions 43 allows the engagement member 30 to move in the radial direction with respect to the ring member 29. Therefore, the holding member 31 that allows only the radial movement of the engagement member 30 relative to the ring member 29 can be realized with a simple configuration. And since the holding member 31 of a thin structure can be implement | achieved by a pair of flat member (38, 39), it can further suppress that the brake cylinder apparatus 1 enlarges to an axial direction.

In addition, according to the present embodiment, the service brake means 12, the spring brake means 14, and the brake release mechanism 15 are provided so that the device can be prevented from being enlarged in the axial direction, and malfunction of the brake release mechanism 15 can also occur. The brake caliper device 100 including the brake cylinder device 1 that can be suppressed can be realized.

(Modification)
Although the 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. For example, the following modifications can be implemented.

(1) In this embodiment, the case where compressed air is used as the pressure fluid for operating the brake cylinder device has been described as an example. However, the present invention is not limited to this, and the operation is performed by other pressure fluid (for example, pressure oil). It may be a thing. Moreover, what operates by an electric motor etc. can also be implemented without using a pressure fluid. At this time, a drive device such as a ball screw is provided instead of the first pressure chamber and the second pressure chamber.

(2) Although the present embodiment has been described as a brake cylinder device not provided with a protrusion length adjusting means for adjusting the protrusion length from the cylinder body of the push rod in accordance with the wear of the braking surface of the brake pad, the protrusion length The present invention can be applied even when the adjusting means is provided.

(3) In the present embodiment, the operation unit of the brake release mechanism has been described by taking as an example an arrangement in which a link member of a shaft-like member that contacts the protrusion of the ring member or a spring means is provided. The form in which the unit is linked may not be as described above, and various forms can be selected and implemented. For example, the connection part of a shaft-shaped member and the protrusion part of a ring member may be connected through a universal joint structure.

(4) The shape of the holding member, the shape of the inclined groove of the ring member, and the shape of the engagement groove of the piston rod need not be the same as in this embodiment, and can be implemented with various changes. Further, in the present embodiment, the case where the plurality of wall portions are formed so as to protrude from one of the pair of flat plate members constituting the holding member has been described as an example, but this need not be the case. For example, it may be a holding member in which wall portions projecting from both flat plate members so as to face each other or wall portions projecting from both flat plate members in order along the circumferential direction may be formed. .

The present invention can be widely applied to a brake mechanism for a vehicle.

Claims

A brake cylinder device used in a brake mechanism for a vehicle,
The first spring and the first pressure chamber have a first piston acting in the opposite direction, and the first fluid is supplied to the first pressure chamber to resist the biasing force of the first spring. Service brake means in which the piston moves relative to the cylinder body and moves in the brake direction;
A push rod movable with the first piston;
The second spring and the second pressure chamber act in opposite directions and have a second piston through which the push rod passes, and the state is changed from the state in which the pressure fluid is supplied to the second pressure chamber to the state in which the second fluid is discharged. Spring brake means for urging the push rod while the second piston moves in the braking direction by the urging force of the second spring,
A brake release mechanism that releases transmission of the urging force in the brake direction to the push rod by the spring brake means to release the brake operation state to the brake non-operation state;
With
The brake release mechanism is
A piston rod which is arranged in a tubular shape around the push rod, transmits the urging force in the brake direction by the spring brake means to the push rod, and has an engagement groove on a side surface;
The piston rod is arranged in a ring shape so as to be rotatable on the outer side in the radial direction, the radial depth is changed so as to be inclined with respect to the circumferential direction, and the piston rod is arranged concentrically with the piston rod. A ring member formed with a plurality of inclined grooves;
An engaging member disposed in the inclined groove so as to be engageable with the engaging groove;
It is provided to move together with the second piston so as to allow the engagement member to move in the radial direction relative to the ring member and to restrict the axial movement of the piston rod relative to the ring member of the engagement member. A holding member for holding the engaging member;
A brake cylinder device comprising:
The brake cylinder device according to claim 1,
The engaging groove is formed such that a cross section extending along the circumferential direction of the piston rod and having a semi-circular shape is perpendicular to the circumferential direction,
The brake cylinder device according to claim 1, wherein the engaging member is formed as a spherical body.
The brake cylinder device according to claim 2,
The brake cylinder device according to claim 1, wherein the engagement groove is formed to extend over the entire circumference on a side surface of the piston rod.
The brake cylinder device according to any one of claims 1 to 3,
An operation unit for rotating the ring member;
The ring member is formed with a projecting portion provided so as to project in a radial direction from a ring body portion formed in a ring shape,
The operation unit has a shaft-shaped member that moves so as to be linked to the protrusion, and the ring member is rotated by the movement of the shaft-shaped member,
Brake cylinder characterized in that a surface on which the protruding member extends and a surface on which the shaft-like member moves is the same surface on which the ring main body is disposed. apparatus.
The brake cylinder device according to claim 4, wherein
The operation unit includes spring means for generating a biasing force that biases the protrusion so that the inclined groove maintains the state where the engagement member is engaged with the engagement groove.
The brake cylinder device according to claim 1, wherein the surface on which the spring means is elastically deformed is the same surface as the surface on which the ring main body portion is disposed.
The brake cylinder device according to any one of claims 1 to 5,
The holding member is provided as a pair of flat plate members arranged on both sides in the axial direction of the piston rod with respect to the ring member, and is arranged along the circumferential direction of the ring member and the pair of flat plates A path that allows a radial movement of the engagement member relative to the ring member is formed by a plurality of wall portions formed so as to protrude from at least one of the shaped members. Cylinder device.
A brake cylinder device according to any one of claims 1 to 6, and a caliper body equipped with the brake cylinder device and attached so as to be movable relative to a vehicle carriage in an axle direction. The brake caliper device is characterized in that the brake cylinder device is operated to generate a braking force by sandwiching the disc on the axle side by a pair of restrictors attached to the caliper body.