JP2011236958A - Caliper brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caliper brake device in which the durability of a piston and a pressing elastic film can be assured.SOLUTION: The caliper brake device for vehicle which applies a frictional force by putting a disk 6 rotating with a wheel 5 between the wheel and the brake device has such a configuration that the pressing elastic film 50 swells by means of fluid pressure introduced into a driving pressure chamber 63 on braking and the piston 65 pushes a brake block 7 against the disk 6, and that a protective elastic film 70 which is interposed between a caliper body 10 and the piston 65 and protects the pressing elastic film 50 is disposed.

Description

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

  Generally, a hydraulic brake of a railway vehicle is equipped with an air-oil converter that converts air pressure supplied from an air pressure source to oil pressure, and a caliper brake device is operated by the oil pressure supplied from the air-oil converter via a hydraulic pipe. It is like that.

  Patent Documents 1 and 2 disclose a hydraulic caliper brake device for a railway vehicle that operates by hydraulic pressure.

  In recent years, it has been desired to install a pneumatic caliper brake device that is operated by a pneumatic pressure supplied from a pneumatic pressure source on a railway vehicle, and to eliminate the above-described air-oil converter and hydraulic piping.

The pneumatic brake device disclosed in Patent Document 3 includes a pressing elastic film that defines a driving pressure chamber, and a piston interposed between the pressing elastic film and the control wheel. The pressure elastic film swells due to the introduced air pressure, and the piston presses the brake against the disc.
JP-A-8-226469 JP-A-8-226471 JP 2009-162245 A

  However, in the pneumatic brake device disclosed in Patent Document 3, when the pressing elastic film is exposed to the outside air, dust or the like adheres to the pressing elastic film, and the durability of the pressing elastic film is impaired. was there.

  In addition, the frictional heat generated in the restrictor is easily transmitted from the restrictor to the piston, the pressing elastic film, etc. via the piston pressing surface, and it is difficult to ensure the heat resistance of the piston, the pressing elastic film, etc. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a caliper brake device that can ensure the durability of a piston and a pressing elastic membrane.

  The present invention relates to a caliper brake device for a vehicle that applies a frictional force across a disk that rotates with a wheel, a caliper body that is supported by a vehicle body, a brake member that slidably contacts the disk and applies a frictional force, An actuator that presses the brake against the disc. The actuator includes a pressing elastic film attached to the caliper body, a driving pressure chamber defined by the pressing elastic film and supplied with fluid pressure during braking, and pressing elasticity. A piston interposed between the membrane and the brake, and a structure in which the pressing elastic membrane is expanded by the fluid pressure guided to the driving pressure chamber during braking so that the piston presses the brake against the disc. And a protective elastic film that is interposed between the protective elastic film and protects the pressing elastic film.

  According to the present invention, at the time of braking, the actuator is operated so that the pressing elastic membrane presses the brake via the piston by the fluid pressure supplied to the driving pressure chamber. At the time of braking, the pressing elastic film is displaced together with the pressing elastic film, so that the operability of the actuator is maintained.

  By covering the pressing elastic film with the protective elastic film, the pressing elastic film is protected from dust and the like without being exposed to the outside air, and its durability is enhanced.

  Since the protective elastic film is interposed between the caliper main body and the piston, the piston is not covered with the protective elastic film, and is sufficiently exposed to the outside air to ensure its heat dissipation.

The top view of the caliper brake device which shows embodiment of this invention. Similarly, a longitudinal sectional view of a caliper brake device. The side view of a caliper brake device. The longitudinal cross-sectional view which shows a part of caliper brake device similarly. The longitudinal cross-sectional view of the caliper brake device which shows other embodiment. The longitudinal cross-sectional view of the caliper brake device which shows other embodiment. The longitudinal cross-sectional view of the caliper brake device which shows other embodiment. The longitudinal cross-sectional view of the caliper brake device which shows other embodiment.

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

  1 to 3 are three views of the caliper brake device 1 showing an embodiment of the present invention. FIG. 3 is a side view of the caliper brake device 1 as viewed from the right side of the vehicle. 1 is a plan view seen from the direction of arrow B in FIG. FIG. 2 is a longitudinal sectional view taken along line AA of FIG. It is assumed that three axes X, Y, and Z orthogonal to each other are set, the X axis extends in the horizontal horizontal direction, the Y axis extends in the vertical direction, and the Z axis extends in the horizontal front-rear direction.

  As shown in FIG. 1, the caliper brake device 1 mounted on a railway vehicle sandwiches the disk 6 of the wheel 5 between the left and right control members 7 and brakes the rotation of the wheel 5.

  In FIG. 2, O is the rotation center axis of the wheel 5, and H is the center line of the wheel 5 orthogonal to the rotation center axis O.

  In FIGS. 1 and 3, reference numeral 20 denotes a support frame fixed on a carriage (vehicle body) (not shown) of the railway vehicle, and reference numeral 10 denotes a caliper body supported by the support frame 20.

  As shown in FIG. 3, the caliper body 10 is floatingly supported on the support frame 20 by the upper and lower slide pins 31 and 32 so as to be slidable in the X-axis direction.

  The caliper body 10 includes left and right caliper arms 12 that extend so as to straddle the disc 6 of the wheel 5, and a yoke portion 13 that connects the left and right caliper arms 12.

  Anchor blocks 48 are fastened to the upper and lower ends of the left caliper arm 12 via bolts 42 (see FIG. 1). A support rail (not shown) is integrally formed with the left caliper arm 12. A dovetail groove is formed in the support rail, and a lining back plate (not shown) of the left restrictor 7 is inserted into the dovetail groove. The restrictor 7 is inserted into the support rail, and its upper and lower ends are prevented from coming off by engaging with an anchor pin 43 provided on the anchor block 48 and fixed to the left caliper arm 12 (see FIG. 1).

  As shown in FIG. 3, adjusters 41 are fastened to the upper and lower ends of the right caliper arm 12 via bolts 42, respectively. The upper and lower adjusters 41 include anchor pins 43 that protrude in the X-axis direction. The both ends of the restrictor 7 and its guide plate (support plate) 8 are supported via the upper and lower anchor pins 43.

  As shown in FIG. 2, the restrictor 7 includes a lining 9 as a friction material in sliding contact with the disk 6, and a metal lining back plate 19 to which a back portion of the lining 9 is attached. The lining 9 is coupled to a lining back plate 19 via a rivet 17.

  As shown in FIG. 1, a dovetail groove 8c extending in the Y-axis direction is formed in the guide plate 8, and an edge portion 19a of a lining back plate 19 of the control wheel 7 is inserted into the dovetail groove 8c. As a result, the lining back plate 19 of the restrictor 7 is supported by the caliper arm 12 via the guide plate 8.

  As shown in FIG. 2, the upper and lower anchor pins 43 are respectively formed with annular step portions 43b. An engagement hole 8 a that engages with the annular step 43 b is formed at the upper end of the guide plate 8. An engaging recess 8b that engages with the annular step 43b is formed at the lower end of the guide plate 8.

  The upper and lower ends of the guide plate 8 are supported so as to be able to move forward and backward with respect to the disk 6 by engaging the upper and lower ends of the guide plate 8 with the annular stepped portions 43 b of the anchor pins 43, and By engaging with 43, the braking reaction force is supported.

  Between the anchor block 48 and the anchor pin 43, a rubber boot 46 covering the exposed portion of the anchor pin 43 is interposed. The sliding portion of the anchor pin 43 is protected from dust by the boot 46.

  When replacing the restrictor 7, first, the lower adjuster 41 is removed from the caliper arm 12, and the anchor pin 43 is disengaged from the lining back plate 19 of the restrictor 7. Next, the restrictor 7 is extracted downward along the dovetail groove 8 c of the guide plate 8. Next, a new restrictor 7 is inserted into the dovetail groove 8 c of the guide plate 8. Next, the lower adjuster 41 is attached to the caliper arm 12, the guide plate 8 is engaged with and supported by the anchor pin 43, and the lining back plate 19 is engaged with the anchor pin 43 to prevent the restrictor 7 from coming off. Is done. In this way, the work of attaching and detaching the control member 7 is performed through the guide plate 8.

  The adjuster 41 is provided with a return spring 44 that urges the restrictor 7 away from the disk 6 via the anchor pin 43, and a gap adjusting mechanism 45 that adjusts the gap between the restrictor 7 and the disk 6 to be substantially constant when the brake is released. When the brake is released, the brake 7 is separated from the disk 6 by the urging force of the return spring 44, and the gap W with the disk 6 is adjusted to be substantially constant by the gap adjusting mechanism 45.

  The right caliper arm 12 is provided with an actuator 60 that presses the brake 7 against the disk 6 via the guide plate 8. The actuator 60 is disposed between the adjusters 41.

  In the actuator 60, the pressing elastic film 50 presses the brake 7 through the piston 65 by the pressurized air (gas) supplied to the driving pressure chamber 63 from an air pressure source mounted on the railway vehicle.

  The actuator 60 includes a housing wall 12b formed on the caliper arm 12, a pressing elastic film 50 attached to the housing wall 12b, a cover 61 fastened to the housing wall 12b, a housing wall 12b, and the pressing elastic film 50. A driving pressure chamber 63 defined between the covers 61 and a piston 65 interposed between the pressing elastic membrane 50 and the brake 7 are provided.

  As shown in FIG. 3, the cross-sectional shapes of the piston 65 and the driving pressure chamber 63 are substantially oval. The housing wall 12 b is formed in a cylindrical surface shape that penetrates the caliper arm 12.

  As shown in FIG. 2, the caliper arm 12 has an annular outer mounting seat 12a that extends around the outer opening edge of the receiving wall 12b. The outer mounting seat 12a also has a substantially oval inner shape and outer shape. The cover 61 has a substantially oval outer shape similar to the outer mounting seat 12a.

  A plurality of screw holes are formed in the outer mounting seat 12a with a predetermined interval, and the cover 61 is fastened via bolts 62 that are screwed into the screw holes. A peripheral edge 50 a of the pressing elastic film 50 is sandwiched between the outer mounting seat 12 a and the cover 61.

  As shown in FIG. 2, the cover 61 is formed in a dish shape in which a portion defining the driving pressure chamber 63 is recessed in a concave shape.

  The pressing elastic film 50 is formed of a resin elastic material. The pressing elastic film 50 is not limited to a resin elastic material, and a bellows may be formed using a composite of reinforcing materials such as carbon fiber and Kevlar fiber. Moreover, you may form the press elastic film 50 using the bellows which consists of a metal thin plate, a rubber tube, or a diaphragm.

  The pressing elastic film 50 includes a peripheral edge part 50 a sandwiched between the outer mounting seat 12 a and the cover 61, a bellows part 50 b that expands and contracts along the housing wall 12 b, and a pressing film part 50 c that faces the control ring 7. Have.

  A piston 65 is interposed between the pressing film portion 50 c of the pressing elastic film 50 and the brake 7. The pressing elastic film 50 presses the brake 7 in the X-axis direction via the piston 65 by the air pressure guided to the drive pressure chamber 63, and presses the brake 7 against the disk 6.

  The piston 65 is formed in a block shape by injection molding of resin. The piston 65 is not limited to resin, and may be formed of metal or other material.

  The piston 65 has a piston pressing surface 65a that contacts the guide plate 8, a piston back surface 65b that contacts the pressing film portion 50c of the pressing elastic film 50, and a piston side surface 65c that faces the housing wall 12b.

  The piston 65 is connected to the guide plate 8 and is displaced in the X-axis direction together with the guide plate 8 guided through the upper and lower anchor pins 43, and transmits the movement of the pressing elastic film 50 to the brake 7.

  As coupling means for coupling the piston 65 to the guide plate 8, a plurality of bolts (not shown) for fastening the piston 65 to the guide plate 8 are provided.

  The coupling means is not limited to this, and the piston 65 may be coupled to the guide plate 8 via a coupling member such as a key or other means.

  Thus, in the present embodiment, the guide plate 8 that supports the restrictor 7, the anchor pin 43 that supports the caliper body 10 so that the guide plate 8 can move forward and backward with respect to the disk 6, and the coupling that couples the piston 65 to the guide plate 8. Means.

  Based on the above configuration, the piston 65 is supported by the guide plate 8 to which the piston 65 is coupled (fastened) so as to be able to advance and retreat, and thus has a portion (guide) that is slidably supported by the caliper body 10. There is no need. For this reason, the fluid pressure guided to the drive pressure chamber 63 is efficiently transmitted to the guide plate 8 without causing sliding resistance between the piston 65 and the caliper main body 10. As a result, the actuator 60 is reduced in size and weight, and the actuator 60 that is operated by air pressure can be interposed in a limited space of the caliper body 10.

  As for piston 65, the piston back surface 65b is formed in a substantially oval shape, and the piston side surface 65c is formed in a cylindrical surface shape.

  Since the pressing elastic film 50 is stretched along the substantially oval piston 65 and the housing wall 12b, the pressing elastic film 50 does not have a bent portion, so that sufficient durability is ensured.

  However, the present invention is not limited to this, and the cross-sectional shapes of the piston 65 and the accommodating wall 12b may be configured to be elliptical or other shapes.

  As shown in FIG. 3, the caliper arm 12 is provided with an inlet portion 18, and a pneumatic pipe communicating with a pneumatic source (not shown) is connected to the inlet portion 18. A switching valve operated by a controller (not shown) is provided between the air pressure source and the driving pressure chamber 63. The switching valve is held at a position for guiding atmospheric pressure to the driving pressure chamber 63 when braking is released, and is held at a position for guiding pressurized air from the air pressure source to the driving pressure chamber 63 during braking.

  Next, the operation of the caliper brake device 1 will be described.

  When the pressure guided from the inlet portion 18 to the driving pressure chamber 63 is reduced when the brake is released, the air in the driving pressure chamber 63 is discharged from the inlet portion 18, the bellows portion 50 b contracts, and the control 7 is returned to the return spring 44. It is separated from the disk 6 by the biasing force. At this time, the gap W with the disk 6 is adjusted to be substantially constant by the gap adjusting mechanism 45.

  By increasing the air pressure guided to the drive pressure chamber 63 during braking, the pressing elastic film 50 swells, and the pressing elastic film 50 presses the brake 7 against the disk 6 via the piston 65. As a result, the braking device 7 applies a frictional force to the disk 6 and brakes the rotation of the wheels.

  In the present embodiment, the caliper body 10 is provided with a pair of anchor pins 43 that support both ends of the guide plate 8 so as to be able to advance and retreat relative to the disk 6, and the drive pressure chamber 63 is disposed between the anchor pins 43. The elastic film 50 expands so that the piston 65 and the guide plate 8 smoothly press the control member 7 against the disk 6 through the anchor pins 43, and the pressure received by the pressure elastic film 50 in the space between the anchor pins 43. A sufficient area can be secured, and the required pressing force can be applied to a wide range of the restrictor 7.

  In the present embodiment, the pressing elastic membrane 50 has a bellows part 50b that expands and contracts between the caliper body 10 and the piston 65, and the caliper body 10 has an accommodating wall 12b that extends around the bellows part 50b and extends in a cylindrical shape. For this reason, the bellows portion 50b of the pressing elastic film 50 is restricted by the housing wall 12b from being expanded in the direction parallel to the disk 6 (including the Y axis and Z axis) by the air pressure guided to the driving pressure chamber 63 during braking. The air flow rate required for the membrane 50 to press the brake 7 is reduced, and the responsiveness of the pressing elastic membrane 50 to press the brake 7 and brake the wheel 5 can be enhanced.

  In the present embodiment, since the caliper body 10 is slidably supported via the upper and lower slide pins 30 and 32, one of the pair of caliper arms 12 extending right across the disk 6 (right side) The actuator 60 can be provided only on the caliper arm 12), and the caliper brake device 1 can be prevented from being enlarged.

  However, the present invention is not limited to this, and the actuators 60 may be provided on both of the pair of caliper arms extending across the disk 6. In this case, the caliper body 10 does not need to be floating supported so as to be slidable in the X-axis direction, and the caliper body 10 is fixed to the carriage (vehicle body).

  FIG. 4 is a longitudinal sectional view showing the pressing elastic membrane 50, the piston 65, the anchor pin 43, and the like. The anchor pin 43 shown in FIG. 4 has a solid structure in which the gap adjusting mechanism 45 is eliminated.

  A protective elastic film 70 is interposed between the caliper body 10 and the piston 65, and the pressing elastic film 50 is protected from dust and the like by the protective elastic film 70.

  The protective elastic film 70 is formed of a resin elastic material and is formed of the same material as the pressing elastic film 50. The protective elastic film 70 may be formed of a material different from the pressing elastic film 50. The protective elastic film 70 is not limited to a resin elastic material, and the boot portion 70b may be formed using a composite of reinforcing materials such as carbon fibers and Kevlar fibers.

  The protective elastic membrane 70 is connected to the caliper-side connecting portion (peripheral portion) 70a attached to the caliper body 10 (caliper arm 12), the boot portion 70b extending and contracting along the accommodating wall 12b and the piston side surface 65c, and the piston 65. And a piston side connecting portion 70c.

  The caliper arm 12 has an annular inner mounting seat 12c extending around the inner opening edge of the receiving wall 12b, and the caliper side connecting portion 70a of the protective elastic film 70 is attached to the inner mounting seat 12c.

  The inner mounting seat 12c is located on the side opposite to the outer mounting seat 12a to which the pressing elastic film 50 is mounted, and is formed so as to face the guide plate 8 of the control device 7 of the caliper arm 12.

  A plurality of screw holes are formed at a predetermined interval in the inner mounting seat 12c, and an annular ring plate 67 is fastened by a plurality of bolts 66 screwed into the screw holes. A caliper side connecting portion 70 a of the protective elastic film 70 is sandwiched between the inner mounting seat 12 c and the ring plate 67.

  The piston-side connecting portion 70c of the protective elastic film 70 is formed in a film shape (sheet shape) extending along the piston back surface 65b and the piston side surface 65c, and is interposed between the piston 65 and the pressing elastic film 50. In other words, the protective elastic film 70 and the pressing elastic film 50 overlap each other and are hung on the piston back surface 65b.

  A protective pressure chamber 73 is defined as a sealed space between the bellows portion 50 b of the pressing elastic membrane 50 and the boot portion 70 b of the protective elastic membrane 70. The protective pressure chamber 73 is partitioned from the driving pressure chamber 63 by the pressing elastic film 50 and from the outside by the protective elastic film 70.

  The boot part 70 b of the protective elastic film 70 is formed to be curved in a U-shaped cross section, like the bellows part 50 b of the pressing elastic film 50. The boot part 70b is displaced along the piston 65 in the direction of the brake 7 together with the pressing elastic film 50 that swells during braking.

  An annular plate 74 is attached to the piston 65 and the guide plate 8. The plate 74 is interposed between the guide plate 8 and the boot portion 70 b of the protective elastic film 70, and locks the boot portion 70 b so as not to contact the guide plate 8.

  As described above, in the present embodiment, a caliper brake device for a vehicle that applies a frictional force across the disk 6 that rotates with the wheel 5, the caliper body 10 supported by the vehicle body (cart), and the disk 6. A brake 7 for sliding and applying a frictional force and an actuator 60 for pressing the brake 7 against the disk 6 are provided. The actuator 60 includes a pressing elastic film 50 attached to the caliper body 10 and the pressing elasticity. A driving pressure chamber 63 defined by the membrane 50 and supplied with fluid pressure (gas pressure) at the time of braking, and a piston 65 interposed between the pressing elastic membrane 50 and the control wheel 7 are provided. The pressure elastic membrane 50 is expanded by the fluid pressure (gas pressure) guided to the chamber 63 and the piston 65 presses the brake 7 against the disk 6. And configured to include a protective elastic film 70 for protecting the pressing elastic film 50 is interposed across between 65.

  Based on the above configuration, during braking, the actuator 60 causes the pressing elastic film 50 to press the brake 7 via the piston 65 by the fluid (gas) pressure supplied to the driving pressure chamber 63.

  During the braking, the pressing elastic film 50 is displaced together with the expanding pressing elastic film 50, so that the operability of the actuator 60 is maintained.

  By covering the pressing elastic film 50 with the protective elastic film 70, the pressing elastic film 50 is protected from dust and the like without being exposed to the outside air, and its durability is enhanced.

  Since the protective elastic film 70 is interposed between the caliper main body 10 and the piston 65, the piston 65 is not covered with the protective elastic film 70 and is sufficiently exposed to the outside air, so that the heat dissipation is sufficiently achieved. Secured.

  In this embodiment, the protective pressure chamber 73 is defined between the pressing elastic film 50 and the protective elastic film 70.

  Based on the above configuration, if the pressing elastic film 50 is damaged, the fluid leaking from the driving pressure chamber 63 through the pressing elastic film 50 flows into the protective pressure chamber 73 and the protective elastic film 70 swells to drive. The fluid pressure in the pressure chamber 63 is maintained, and the operability of the actuator 60 is maintained. That is, the protective elastic film 70 performs a fail-safe function against damage to the pressing elastic film 50.

  In the present embodiment, the protective elastic film 70 has a piston-side connecting portion 70 c interposed between the piston 65 and the pressing elastic film 50.

  Based on the above configuration, it is not necessary to provide an engagement groove or a fastening means for connecting the protective elastic film 70 to the piston 65, the structure is simplified, and the actuator 60 is not enlarged.

  In the present embodiment, the caliper main body 10 has a housing wall 12b that houses the piston 65, and an annular inner mounting seat 12c that extends around an inner opening edge facing the control element 7 of the housing wall 12b, The elastic film 70 has a caliper side connecting portion 70a fastened to the inner mounting seat 12c (see FIG. 4).

  Based on the above configuration, the caliper side connecting portion 70a is connected to the caliper main body 10 between the wheel restrictors 7, and an increase in the size of the actuator 60 is avoided.

  Next, another embodiment shown in FIG. 5 will be described. This basically has the same configuration as that of the embodiment of FIGS. 1 to 4, and only different portions will be described.

  The caliper side connecting portion 70 a of the protective elastic film 70 is fastened to the outer mounting seat 12 a of the caliper arm 12 together with the peripheral edge portion 50 a of the pressing elastic film 50. The caliper side connecting portion 70 a and the peripheral edge portion 50 a of the pressing elastic film 50 are sandwiched between the outer mounting seat 12 a and the cover 61 and fastened via a plurality of bolts 62.

  In the present embodiment, the caliper body 10 has a housing wall 12b that houses the piston 65, and an annular outer mounting seat 12a that extends around the outer opening edge of the housing wall 12b, and the actuator 60 is attached to the outer mounting seat 12a. A cover 61 that is fastened and defines a drive pressure chamber 63 is provided. The protective elastic film 70 has a caliper side connecting portion 70 a that is sandwiched between the outer mounting seat 12 a and the cover 61 together with the peripheral edge portion 50 of the pressing elastic membrane 50. The configuration.

  Based on the above configuration, the caliper side connecting portion 70a is fastened to the caliper body 10 together with the peripheral edge portion 50 of the pressing elastic film 50 and the cover 61, so that the actuator 60 is prevented from being enlarged.

  Next, another embodiment shown in FIG. 6 will be described. The piston 65 is divided into first and second piston members 76 and 77 on a plane parallel to the disk 6. The first and second piston members 76 and 77 are fastened through a plurality of bolts (not shown).

  The piston-side connecting portion 70 d of the protective elastic film 70 is sandwiched between the first and second piston members 76 and 77.

  In the present embodiment, the piston 65 includes first and second piston members 76 and 77 that are fastened to each other, and the protective elastic film 70 is a piston-side coupling portion that is sandwiched between the first and second piston members 76 and 77. 70e.

  Based on the above configuration, it is possible to dispose the protective elastic film 70 so as not to have a portion in contact with the pressing elastic film 50, and it is possible to avoid wear or the like between the two.

  Next, another embodiment shown in FIG. 7 will be described. The piston 65 has an annular engagement groove 81 formed on the piston side surface 65c. The engagement groove 81 is formed at a position away from the pressing elastic film 50.

  The protective elastic film 70 has an annular piston-side connecting portion (engaging portion) 70 f that fits in the engaging groove 81.

  Based on the above configuration, it is possible to dispose the protective elastic film 70 so as not to have a portion in contact with the pressing elastic film 50, and it is possible to avoid wear or the like between the two.

  Next, another embodiment shown in FIG. 8 will be described. The engaging groove 81 is formed at a position facing the bellows portion 50 b of the pressing elastic film 50. The piston-side connecting portion 70 f is pressed by the pressure of the driving pressure chamber 63 via the bellows portion 50 b and is prevented from coming off from the engaging groove 81.

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

DESCRIPTION OF SYMBOLS 1 Caliper brake device 5 Wheel 6 Disc 7 Limiter 10 Caliper main body 12 Caliper arm 19 Lining back plate 43 Anchor pin 50 Pressing elastic membrane 60 Actuator 63 Driving pressure chamber 65 Piston 65a Piston pressing surface 65b Piston back surface 65c Piston side surface 70 Protective elastic membrane 70a Caliper side connecting portion 70c Piston side connecting portion 70d Piston side connecting portion 70e Piston side connecting portion 70f Piston side connecting portion 73 Protective pressure chamber 76 First piston member 77 Second piston member 81 Engaging groove

Claims (8)

A caliper brake device for a vehicle that applies frictional force across a disk that rotates with a wheel,
A caliper body supported by the vehicle body;
A control device that slidably contacts the disk and imparts frictional force;
An actuator for pressing the control against the disc,
This actuator
A pressing elastic membrane attached to the caliper body;
A driving pressure chamber defined by the pressing elastic membrane and supplied with fluid pressure during braking;
A piston interposed between the pressing elastic membrane and the control wheel,
The configuration is such that the pressing elastic membrane swells due to the fluid pressure guided to the driving pressure chamber during braking and the piston presses the brake against the disc,
A caliper brake device comprising a protective elastic film interposed between the caliper body and the piston to protect the pressing elastic film.   The caliper brake device according to claim 1, further comprising a protective pressure chamber defined between the pressing elastic film and the protective elastic film.   The caliper brake device according to claim 2, wherein the protective elastic film has a piston side connecting portion interposed between the piston and the pressing elastic film. The caliper body is
An accommodating wall for accommodating the piston;
An annular inner mounting seat extending around an inner opening edge of the housing wall facing the control device,
The caliper brake device according to any one of claims 1 to 3, wherein the protective elastic film has a caliper side connecting portion fastened to the inner mounting seat. The caliper body is
An accommodating wall for accommodating the piston;
An annular outer mounting seat extending around an outer opening edge of the receiving wall;
The actuator includes a cover fastened to the outer mounting seat and defining a driving pressure chamber,
The said protective elastic film has a caliper side connection part clamped between the said outer attachment seat and the said cover with the said press elastic film, The Claim 1 characterized by the above-mentioned. Caliper brake device. The piston includes first and second piston members fastened to each other,
The caliper brake device according to any one of claims 1, 2, 3, and 5, wherein the protective elastic film has a piston-side connecting portion that is sandwiched between the first and second piston members. . An annular engagement groove is formed in the piston,
The caliper brake device according to any one of claims 1, 2, 3, and 5, wherein the protective elastic film has an annular piston-side coupling portion that fits into the engagement groove. The pressing elastic membrane has a bellows portion that expands and contracts between the caliper body and the piston,
The engagement groove is formed at a position facing the bellows part,
The caliper brake device according to claim 7, wherein the piston-side coupling portion is configured to be pressed through the bellows portion by a fluid pressure in the driving pressure chamber.

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