TW201536608A - Master cylinder, and reservoir - Google Patents

Abstract

A master cylinder includes: a reservoir wall portion formed around a storage chamber in which brake fluid is stored and of which an upper part is opened, with an outer side exposed to the flow of air while a vehicle travels; a lid portion (161) covering the opening of the reservoir wall portion; and a diaphragm partitioning the storage chamber into a fluid chamber and an air chamber. The lid portion (161) or the reservoir wall portion is fitted with an atmosphere communication passageway (251, 271) including an opening portion (253, 273) opened externally toward the forward direction of movement of the vehicle and passing around the storage chamber while being in communication with the air chamber at a position displaced from the opening portion (253, 273).

Description

Master pump and reservoir

The present invention relates to a master pump and a liquid storage cylinder for a vehicle.

There is a master pump configured to: arrange a diaphragm between a reservoir tank and a cover covering the opening thereof, and use the diaphragm to divide the inside of the reservoir tank into upper and lower portions (for example, please refer to the patent literature) 1).

[Advanced technical literature] [Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 61-41660

In the above-described master cylinder, there is a possibility that the brake fluid leaks due to the airflow when the vehicle is traveling.

Accordingly, it is an object of the present invention to provide a master pump and a reservoir that can suppress leakage of brake fluid.

In order to achieve the above-described object, the present invention has a structure in which a lid portion or a wall portion of the liquid storage cylinder is provided with an opening that opens toward the outside in the forward direction side of the vehicle, and passes through the periphery of the storage chamber from the opening portion. The separated location is connected to the atmospheric passage of the plenum.

According to the present invention, it is possible to provide a master pump and a reservoir which can suppress leakage of brake fluid.

10‧‧‧reservoir

11‧‧‧Master pump

24‧‧‧ brake lever

35‧‧‧Hydraulic cylinder

36‧‧‧Liquid wall

38‧‧‧Reservation room

59‧‧‧煞车分泵

76‧‧‧Piston

161, 161A, 161B‧‧ ‧ cover

163‧‧‧diaphragm

231‧‧‧ liquid room

232‧‧‧ air chamber

251, 251A, 251B, 271, 271A, 271B‧‧‧ atmosphere passage

253, 273‧‧‧ External opening (opening)

Fig. 1 is a plan view showing a first embodiment of the present invention.

Fig. 2 is a cross-sectional view showing a first embodiment of the present invention.

Fig. 3 is a cross-sectional view showing a first embodiment of the present invention.

Fig. 4 is a partially exploded perspective view showing a first embodiment of the present invention.

Fig. 5 is a rear elevational view showing the lid portion of the first embodiment of the present invention.

Fig. 6 is a rear elevational view showing a lid portion according to a second embodiment of the present invention.

Fig. 7 is a rear elevational view showing a lid portion according to a third embodiment of the present invention.

Fig. 8 is a partial cross-sectional view showing a fourth embodiment of the present invention.

"First embodiment"

The first embodiment of the present invention will be described with reference to Figs. 1 to 5 . As shown in Fig. 1, the first embodiment is a cartridge-integrated master cylinder 11 in which "the reservoir 10 constitutes a part of the master pump 11". The master pump 11 is a device that is attached to a locomotive, a three-wheel buggy, or a four-wheel buggy, such as a three-wheel buggy, in a state of being exposed to the outside. In the present description, the description will be made of "the state in which the master pump 11 including the liquid storage cartridge 10 is attached to the vehicle". In the description, the front, the rear, the left, and the right of the vehicle are respectively used as the front. The direction of the rear, left, and right is explained. In the first embodiment, the master cylinder 11 for front wheel brake is operated by the right hand of the driver. The present invention is also applicable to a master cylinder for a rear wheel brake or a master cylinder for a clutch operated by the left hand of the driver. In this case, the right and left (direction) formation in the following description is reversed.

The master pump 11 is disposed in the vehicle at a position directly accessible to the traveling wind (or called traveling wind), and more specifically, is mounted on the right side of the steering bar 15 of the vehicle. The mounting portion 16 of the position of the portion. The steering rod 15 is formed by applying a suitable bending process to the cylindrical pipe member, at least "the safety of the main pump 11 is installed. The outer peripheral surface of the mounting portion 16 is formed into a cylindrical surface.

The master pump 11 has a main body member 21 made of metal, a socket 22, a lock member 23, a brake lever 24, and a support member 25. The main body member 21 is disposed on the front side of the mounting portion 16 of the steering lever 15 by a cast integrally molded product. In the main body member 21, a mounting seat portion 30 that protrudes rearward is formed on the right side portion thereof. The main body member 21 is attached to the steering lever 15 by the attachment portion 16 in which the steering lever 15 is sandwiched between the mounting seat portion 30 and the socket 22. The mounting seat portion 30 and the socket 22 are joined by a locking member 23 which is a bolt itself, and the steering rod 15 is sandwiched. In Fig. 1, since one of the locking members 23 is shown in a plan view, the locking members 23 are provided in two on the upper and lower sides.

In the body member 21, a tie rod support portion 31 that protrudes forward is formed at a lower portion of the right side portion thereof. The brake lever 24 is attached to the tie rod support portion 31 by a support member 25 formed of a bolt. The support member 25 is attached to the tie rod support portion 31 in the vertical direction, and the brake lever 24 is rotated about the support member 25. The brake lever 24 extends forward along the steering lever 15 in front of the steering lever 15. In the main body member 21, on the upper side of the tie rod support portion 31, that is, on the upper side of the right side portion, a mirror attachment portion 32 to which the mirror attachment is not shown in the drawing is formed.

The body member 21 is provided with a hydraulic cylinder 35 that extends leftward from the proximal end side of the mounting seat portion 30. The hydraulic cylinder 35 is disposed in front of the steering rod 15 along the axial direction of the mounting portion 16. The hydraulic cylinder 35, as shown in Fig. 2, is formed at a lower portion of the body member 21 at a hydraulic pressure A reservoir wall portion 36 is formed in an upper portion of the cylinder 35. The liquid storage cylinder wall portion 36 has a cylindrical shape in the vertical direction and a "storage tank bottom 37 for closing the hydraulic cylinder 35 side" to form a storage chamber 38 for storing the brake fluid. The reservoir bottom 37 contains a portion of the hydraulic cylinder 35.

The hydraulic cylinder 35 has a bottomed cylindrical shape in which a cylinder bore 45 that opens toward the tie rod support portion 31 side is formed. The cylinder bore 45 is along the axial direction of the mounting portion 16 of the steering rod 15 shown in Fig. 1 . As shown in FIG. 2, the hydraulic cylinder hole 45 has a main hole portion 51, a fitting hole portion 53, and an inlet and outlet hole portion in this order from the side of the cylinder bottom portion 46 on the opposite side with respect to the tie rod support portion 31. The leading edge portion of the hole) 54. The central axis of the cylinder bore 45 becomes the axis of the hydraulic cylinder 35. Hereinafter, the axial direction of the hydraulic cylinder 35 is referred to as a cylinder axis direction.

The main hole portion 51 has the longest axial length in the cylinder bore 45. The fitting hole portion 53 is formed on the opposite side, that is, the right side with respect to the cylinder bottom portion 46 of the main hole portion 51, and has a larger inner diameter than the main hole portion 51. The inlet/outlet hole portion 54 is formed on the opposite side with respect to the cylinder bottom portion 46 of the fitting hole portion 53, and is disposed on the opposite side of the cylinder bottom portion 46 in the cylinder bore 45. The entrance and exit hole portion 54 is formed such that the hole diameter is larger than the main hole portion 51, but is slightly smaller than the fitting hole portion 53.

A threaded hole portion 55 is formed in the bottom 46 of the cylinder through the bottom 46 of the cylinder. The threaded hole portion 55 has a maximum inner diameter which is smaller than the inner diameter of the main hole portion 51. In the screw hole portion 55, the stem of the brake pipe 58 indicated by the two-point lock line in Fig. 2 is locked. The brake pipe 58 is connected to a brake pump of a brake device such as a disc on the wheel side. 59.

A communication hole 63 and a communication hole 64 that "connect the cylinder bore 45 to the storage chamber 38" are formed in the bottom portion 37 of the reservoir. The communication hole 63 is disposed on the side of the cylinder bottom portion 46 that faces the cylinder axis direction, that is, the left side, compared to the communication hole 64. The communication hole 63 has a large aperture portion 65 disposed on the side of the storage chamber 38, and a small aperture portion 66 having a small aperture and disposed on the side of the cylinder bore 45. The communication hole 63 opens toward the storage chamber 38 at the large aperture portion 65, and opens toward the cylinder bore 45 at the small aperture portion 66. The communication hole 64 has a large aperture portion 68 disposed on the side of the storage chamber 38, and a small aperture portion 69 having a small aperture and disposed on the side of the cylinder bore 45. The communication hole 64 opens toward the storage chamber 38 at the large aperture portion 68, and opens toward the cylinder bore 45 at the small aperture portion 69. The small aperture portion 69 of the communication hole 64 is a small aperture portion 66 that is formed larger than the communication hole 63.

The master pump 11 has a return spring 75, a piston 76, a cup seal 77, an O-ring 78, a retaining ring 79, a boot 80, and a pressing spring 81, all of which are disposed in the above-described cylinder bore 45. The return spring 75, the piston 76, the retaining ring 79, and the pressing spring 81 are made of metal, and the cup seal 77, the O-ring 78, and the boot 80 are formed of an elastic material such as rubber.

The piston 76 has a shaft portion 85, a flange portion 86, a shaft portion 87, a flange portion 88, a shaft portion 89, a shaft portion 90, a shaft portion 91, a flange portion 92, a shaft portion 93, a shaft portion 94, and a shaft portion 95. The shaft portion 96 and the flange portion 97. The piston 76 is inserted into the side of the inlet and outlet hole portion 54 of the cylinder bore 45.

The shaft portion 85 is formed in: the piston 76 is closest to the hydraulic cylinder The bottom 46 side, that is, the left side. The flange portion 86 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 85, that is, the right side, and has a larger outer diameter than the shaft portion 85. The shaft portion 87 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the flange portion 86, and has an outer diameter smaller than that of the shaft portion 85. The flange portion 88 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 87, and has a larger outer diameter than the flange portion 86. The shaft portion 89 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the flange portion 88, and has an outer diameter smaller than that of the flange portion 88. The shaft portion 90 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 89, and has the same outer diameter as the flange portion 88. The shaft portion 91 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 90, and has an outer diameter smaller than that of the shaft portion 90.

The flange portion 92 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 91, and has the same outer diameter as the shaft portion 90. The shaft portion 93 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the flange portion 92, and has an outer diameter smaller than that of the flange portion 92. The shaft portion 94 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 93, and has an outer diameter smaller than that of the shaft portion 93. The shaft portion 95 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 94, and has a larger outer diameter than the shaft portion 94. The shaft portion 96 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 95, and has a smaller outer diameter than the shaft portion 95. The flange portion 97 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the shaft portion 96, and has a larger outer diameter than the shaft portion 96. The flange portion 97 is formed in the piston 76 with respect to the most opposite side of the cylinder bottom 46. The piston 76 is slidably fitted to the main body of the cylinder bore 45 in the flange portion 88, the shaft portion 90, and the flange portion 92. Hole portion 51. As a result, the piston 76 is slidably disposed in the hydraulic cylinder 35 and moves in the cylinder axis direction.

The return spring 75 is a tapered coil spring having a larger diameter on one end side than the other end side in the axial direction, and abuts against the cylinder bottom portion 46 at the end portion on the large diameter side, and abuts on the end portion on the small diameter side. The flange portion 86 has a shaft portion 85 of the piston 76 penetrating the inside thereof.

The cup seal 77 is formed in a C-shape having a shape including a cross section of the center axis and opening toward one side thereof. The cup seal 77 is disposed between the flange portions 86 and 88 of the piston 76 and fitted to the shaft portion 87. The cup seal 77 is in a state in which the opening side is disposed on the side of the flange portion 86, and the outer peripheral portion thereof is slidably attached to the inner peripheral surface of the main hole portion 51.

The O-ring 78 is disposed between the shaft portion 90 of the piston 76 and the flange portion 92, and is fitted to the shaft portion 91. The O-ring 78 has an outer peripheral portion that is slidably attached to the inner peripheral surface of the main hole portion 51. The fixing ring 79 is formed in a C shape and is fitted and fixed to the fitting hole portion 53. In the fixing ring 79, the locking piece portions not shown in the plane extending inward in the radial direction are formed in plural in the circumferential direction, and the locking piece portions are formed to abut against the flange portion 92 of the piston 76. The end face on the side of the shaft portion 93. In this way, the retaining ring 79 can restrict the "piston 76 pressed by the return spring 75" from being pulled out from the cylinder bore 45. The dust jacket 80 is formed in a cylindrical shape, and one end portion thereof is disposed between the shaft portion 95 of the piston 76 and the flange portion 97, and is fitted to the shaft portion 96. The dust jacket 80 extends in the inlet/outlet hole portion 54 such that the other end side thereof is located on the fitting hole portion 53 side, and the other end portion thereof is pressed against the inner circumferential surface of the inlet and outlet hole portion 54 by the pressing spring 81.

In the cylinder bore 45, it is more toward the O-ring 78 of the piston 76. The cylinder bottom portion 46 is formed to be filled with the brake fluid, and the cup seal 77 is formed in the portion of the piston 76 and the screw hole portion 55 of the main hole portion 51 to communicate with the brake cylinder 59 through the brake pipe 58. Hydraulic chamber 101".

The pressing portion 102 of the brake lever 24 is disposed on the opposite side with respect to the cylinder bottom portion 46 of the flange portion 97 of the piston 76. Once the brake lever 24 is operated, the pressing portion 102 is formed toward the cylinder bottom 46 side, that is, toward the left side, and the piston 76 is pressed in this direction. In this case, "the piston 76 and the cup seal 77 are integrally moved in the direction of reducing the hydraulic pressure chamber 101", and thus the brake fluid is supplied from the hydraulic chamber 101 to the brake cylinder 59 via the brake pipe 58. In other words, the brake hydraulic pressure is generated by the operation of the brake lever 24 to advance the piston 76 in the direction of the cylinder bottom 46. Further, once the operation of the brake lever 24 is released, the piston 76 is returned (reset) by the spring force of the return spring 75, and the brake fluid of the brake cylinder 59 is returned to the hydraulic chamber 101. In this context, once the amount of brake friction material of the brake device is reduced, the volume of the hydraulic chamber on the side of the brake cylinder 59 will be increased. In the master pump 11, when the brake lever 24 is not in the operating state, since the hydraulic chamber 101 communicates with the storage chamber 38 through the communication hole 63, the brake liquid of this portion (parts) is supplied from the storage chamber 38 to the hydraulic chamber 101.

The liquid storage cylinder wall portion 36 is formed by being disposed on the side of the hydraulic cylinder bottom portion 46, that is, the side wall portion 111 disposed on the left side; and the front wall portion 112 disposed on the front side; with respect to the bottom portion 46 of the hydraulic cylinder , disposed on the opposite side, that is, the side wall portion 113 disposed on the right side; The rear wall portion 114 shown in FIG. 3 on the rear side; and the corner wall portion 115 between the front wall portion 112 and the side wall portion 113; and between the side wall portion 111 and the rear wall portion 114, as shown in FIG. Corner wall portion 116. The reservoir wall portion 36 is formed in a quadrangular cylindrical shape. The liquid storage cylinder wall portion 36 is formed by the side wall portion 111, the front wall portion 112, the corner wall portion 115, the side wall portion 113, the rear wall portion 114, and the corner wall portion 116 surrounding the storage chamber 38, and an opening is formed in the upper portion thereof.

As shown in FIG. 3, in the front wall portion 112, a convex portion 118 that protrudes forward is formed at an intermediate position in the vertical direction, and a window hole 119 is formed in the center of the convex portion 118. In the window hole 119, the front side becomes the large aperture portion 120, and the rear side forms the small aperture portion 121 having a smaller aperture than the large aperture portion. The master pump 11 has a window member 122 and a sealing member 123 that are attached to the window hole 119 of the body member 21. The window member 122 is formed of a light transmissive material and is fixed to the large aperture portion 120 through the annular sealing member 123. Through the window member 122, the level of the brake fluid located in the storage chamber 38 in the wall portion 36 of the reservoir is visible.

On the outer side of the upper end portion of the liquid storage cylinder wall portion 36, the protruding end edge portion 131 that protrudes outward from the lower side portion is formed in a ring shape over the entire circumference. Further, on the inner side of the upper portion of the wall portion 36 of the liquid storage cylinder, a stepped portion 141 having a stepped shape is formed thinner than the lower portion, and an annular shape is formed over the entire circumference.

As shown in Fig. 4, the corner wall portion 115 has a shape that protrudes toward the inner side (the storage chamber 38 side) from the front wall portion 112 and the side wall portion 113, and the corner wall portion 116 forms the side wall portion 111 and the rear wall portion. The shape of the portion 114 that protrudes more toward the inside. A screw hole 148 is formed in the upper portion of the corner wall portion 115, and a screw hole 149 is formed in the upper portion of the corner wall portion 116.

The liquid storage cylinder wall portion 36 has an upper end surface 151 of the side wall portion 111 connected to the upper end surface 152 of the front wall portion 112, and the upper end surface 152 is connected to the upper end surface 155 of the corner wall portion 115, the upper end surface 155 and the side wall portion 113 The upper end surface 153 is connected. Further, the upper end surface 153 is connected to the upper end surface 154 of the rear wall portion 114, and the upper end surface 154 is connected to the upper end surface 156 of the corner wall portion 116, and the upper end surface 156 is connected to the upper end surface 151. These upper end faces 151 to 156 each form a flat surface and are disposed in the same plane. These upper end faces 151 to 156 constitute a frame-shaped end face 157 having a square frame shape as a whole. Similarly to the corner wall portions 115 and 116, the upper end surface 155 has a shape that protrudes toward the inner corners from the upper end faces 152 and 153, and the upper end surface 156 has a shape that protrudes toward the inner corners from the upper end faces 151 and 154.

The master pump 11 includes a metal cover portion 161, metal cover mounting members 162 and 162, and a diaphragm 163 formed of a rubber elastic material such as EPDM (ethylene propylene diene monomer). .

The diaphragm 163 has a placing plate portion 171 placed on the upper end surface 151 of the side wall portion 111, and a mounting plate portion 172 placed on the upper end surface 152 of the front wall portion 112, and placed on the side wall portion. A mounting plate portion 173 of the upper end surface 153 of 113 is provided. Further, the diaphragm 163 has a placing plate portion 174 placed on the upper end surface 154 of the rear wall portion 114, and a mounting plate portion 175 placed on the upper end surface 155 of the corner wall portion 115, and placed thereon. The mounting plate portion 176 of the end surface 156 above the corner wall portion 116. The placing plate portion 171 is connected to the placing plate portion 172, the placing plate portion 172 is connected to the placing plate portion 175, and the placing plate portion 175 is connected to the placing plate portion 173. In addition, the mounting plate portion 173 and the loading The placing plate portion 174 is connected, the placing plate portion 174 is connected to the placing plate portion 176, and the placing plate portion 176 is connected to the placing plate portion 171.

Each of these placing plate portions 171 to 176 is formed into a flat surface and disposed in the same plane. The mounting plate portions 171 to 176 constitute a frame-shaped plate portion 177 having a rectangular frame shape as a whole. Similarly to the upper end surface 155 of the corner wall portion 115, the placing plate portion 175 has a shape that protrudes toward the inner corners from the mounting plate portions 172 and 173, and is the same as the upper end surface 156 of the corner wall portion 116, and the plate portion 176 is placed. A shape that protrudes toward the inner corners from the mounting plate portions 171 and 174 is formed. The mounting plate portion 175 is formed with an insertion hole 178 that penetrates in the thickness direction, and the mounting plate portion 176 is formed with an insertion hole 179 that penetrates in the thickness direction.

As shown in FIG. 3, the diaphragm 163 has a cylindrical outer tubular portion 181 extending downward from the inner peripheral edge portion of the frame-shaped plate portion 177, and extends inward from the lower end portion of the outer tubular portion 181. a frame-shaped outer lower plate portion 182; a cylindrical intermediate tubular portion 183 extending upward from the inner peripheral edge portion of the outer lower plate portion 182; and a frame-like shape extending inward from the upper end portion of the intermediate tubular portion 183 The upper plate portion 184; and a cylindrical inner cylindrical portion 185 extending downward from the inner peripheral edge portion of the upper plate portion 184; and extending inward from the lower end portion of the inner cylindrical portion 185, and closing the inner cylindrical portion The plate-shaped inner lower plate 186 of the portion 185. The outer tubular portion 181, the outer lower plate portion 182, the intermediate tubular portion 183, the upper plate portion 184, the inner cylindrical portion 185, and the inner lower plate portion 186 are disposed in the storage chamber 38.

The lid portion 161 is an integrally formed product formed by casting, covering the upper opening of the wall portion 36 of the liquid storage cylinder, and the back side thereof and the wall of the liquid storage cylinder The frame-shaped end surface 157 of the portion 36 encloses the frame-shaped plate portion 177 of the diaphragm 163. In other words, the diaphragm 163 is directly sandwiched by the reservoir wall portion 36 of the body member 21 and the lid portion 161. As shown in FIG. 4, the lid portion 161 has a main plate portion 190 that covers the upper opening of the liquid storage cylinder wall portion 36. In the main plate portion 190, the left side edge portion 191 is connected to the front side edge portion 192, the front edge portion 192 is connected to the right side edge portion 193, and the side edge portion 193 is connected to the rear side trailing edge portion 194, and the rear edge portion is connected. 194 is connected to the side edge portion 191.

The side edge portion 191, the front edge portion 192, the side edge portion 193, and the rear edge portion 194 constitute a frame-like edge portion 195 having a square frame shape as a whole. The outer end surface of the front edge portion 192 and the outer end surface of the rear edge portion 194 are formed in a planar shape parallel to each other, and the outer end surface of the side edge portion 191 and the outer end surface of the side edge portion 193 are formed to be "convex in opposite directions". Mirror-symmetrical curved shape. The outer peripheral end surface of the frame-shaped edge portion 195 is formed in a shape larger than the outer peripheral edge portion of the frame-shaped end surface 157 of the liquid storage cylinder wall portion 366 (larger one size), and a frame-shaped plate larger than the diaphragm 163 is formed. The outer peripheral end surface of the portion 177 has a shape of two turns (large size). The lid portion 161 has a corner portion between the front edge portion 192 of the main plate portion 190 and the right side edge portion 193, and is fixed to the cartridge wall portion 36 by the lid attachment member 162 formed by a screw, and the main plate portion The corner portion between the rear edge portion 194 of the 190 and the left side edge portion 191 is fixed to the cartridge wall portion 36 by the lid attachment member 162 formed of a screw.

In the main plate portion 190, an insertion hole 198 through which the cover portion mounting member 162 is inserted is formed at a corner portion between the front edge portion 192 and the side edge portion 193, between the trailing edge portion 194 and the side edge portion 191. The corners are formed An insertion hole 199 through which the cover mounting member 162 is inserted. As shown in the rear view of Fig. 5, in the cover portion 161, a cylindrical tubular portion 200 having a rectangular tubular shape projecting from the back surface in the vertical direction is formed in a region inside the insertion holes 198 and 199 of the main plate portion 190. . The cylindrical projecting portion 200 has a protruding portion 201 along the side edge portion 191, a protruding portion 202 along the front edge portion 192, a protruding portion 203 along the side edge portion 193, and a protruding portion along the trailing edge portion 194. 204. Further, the cylindrical projecting portion 200 has a protruding portion 205 that connects the protruding portion 202 and the protruding portion 203 on the insertion hole 199 side of the insertion hole 198, and a connecting portion on the insertion hole 198 side of the insertion hole 199. 201 and a protrusion 206 of the protrusion 204. The cylindrical projecting portion 200 is inserted between the outer tubular portion 181 of the diaphragm 163 and the intermediate tubular portion 183 as shown in FIGS. 2 and 3 .

In the lid portion 161, as shown in FIGS. 2 and 5, a protruding wall portion 211 that protrudes perpendicularly from the main plate portion 190 from the rear surface of the outer edge portion of the side edge portion 191 of the main plate portion 190; As shown in FIGS. 3 and 5, the protruding wall portion 212 that protrudes perpendicularly from the main plate portion 190 from the rear surface of the outer edge portion of the front edge portion 192 of the main plate portion 190. Further, in the lid portion 161, as shown in FIGS. 2 and 5, the protruding wall portion 213 that protrudes perpendicularly from the main plate portion 190 from the back surface of the outer edge portion of the side edge portion 193 of the main plate portion 190 is formed. As shown in FIGS. 3 and 5, the protruding wall portion 214 that protrudes perpendicularly from the main plate portion 190 from the rear surface of the outer edge portion of the rear edge portion 194 of the main plate portion 190. As shown in Fig. 5, the protruding wall portion 211 is connected to the protruding wall portion 212, the protruding wall portion 212 is connected to the protruding wall portion 213, and the protruding wall portion 213 is connected to the protruding wall portion 214. The protruding wall portion 214 is connected to the protruding wall portion 211. As a result, the protruding wall portions 211 to 214 constitute a frame-shaped wall portion 215 having a square frame shape as a whole. The protruding wall portions 212 and 214 are formed in a straight line parallel to each other, and the protruding portions 211 and 213 are formed in a mirror-symmetrical arc shape in which "the sides are convex in opposite directions".

The main plate portion 190, "the face portion 221 between the protruding wall portion 211 and the protruding portion 201" and the "face portion 222 between the protruding wall portion 212 and the protruding portion 202" are connected, and the face portion 222 and the "protruding wall portion 212, 213 and the protruding portion" The face 225" between the portions 205 is connected. Further, the face portion 225 and the "face portion 223 between the protruding wall portion 213 and the protruding portion 203" are connected, and the face portion 223 and the "face portion 224 between the protruding wall portion 214 and the protruding portion 204" are connected. Further, the face portion 224 and the "face portion 226" between the protruding wall portions 211, 214 and the protruding portion 206 are connected, and the face portion 226 is connected to the face portion 221. These faces 221 to 226 are all formed into flat faces and are disposed in the same plane. These faces 221 to 226 constitute a frame-shaped surface portion 227 having a square frame shape as a whole. The face portion 221 is along the protruding wall portion 211, the face portion 222 is along the protruding wall portion 212, the face portion 223 is along the protruding wall portion 213, and the face portion 224 is along the protruding wall portion 214. The face portions 222 and 224 are formed in a straight line parallel to each other, and the face portions 221 and 223 are formed in an arc shape.

The face portion 225 is enlarged such that the width in the front-rear direction is wider than the face 222 and the width in the left-right direction protrudes toward the inner corners wider than the face 223; and the insertion hole 198 is formed at an intermediate position of the face 225. The face portion 226 is enlarged such that the width in the front-rear direction is wider than the face 224 and the width in the left-right direction is wider toward the inside corner than the face 221 And an insertion hole 199 is formed at an intermediate position of the face 226.

As shown in FIG. 2, the frame-like plate portion 177 of the diaphragm 163 is sandwiched by the frame-shaped end surface 157 of the reservoir wall portion 36 and the frame-shaped surface portion 227 of the lid portion 161. That is, the placing plate portion 171 is sandwiched by the upper end surface 151 and the surface portion 221, and the placing plate portion 173 is sandwiched by the upper end surface 153 and the surface portion 223. Further, as shown in FIG. 3, the placing plate portion 172 is sandwiched by the upper end surface 152 and the surface portion 222, and the placing plate portion 174 is sandwiched by the upper end surface 154 and the surface portion 224. In addition, the placing plate portion 175 shown in Fig. 4 is sandwiched by the upper end surface 155 and the surface portion 225 shown in Fig. 5, and the placing plate portion 176 shown in Fig. 4 is covered by the upper end surface 156 and the first surface. The face 226 shown in Fig. 5 is sandwiched.

In Fig. 5, the frame-like plate portion 177 of the diaphragm 163 is displayed with a two-point lock line with respect to the lid portion 161 displayed in a solid line. In the above-described occlusion state, the outer end surface of the placing plate portion 171 faces the inner wall surface of the protruding wall portion 211 in a state of abutting or approaching, and the outer end surface of the mounting plate portion 172 is abutted or close. The state faces the inner wall surface of the protruding wall portion 212, and the outer end surface of the mounting plate portion 173 faces the inner wall surface of the protruding wall portion 213 in a state of abutting or approaching, and the outer end surface of the mounting plate portion 174 is abutted or The approaching state faces the inner wall surface of the protruding wall portion 214. Further, the outer end surface of the placing plate portion 175 faces the inner wall surface of the corner portion of the protruding wall portions 212 and 213 in a state of abutting or approaching, and the outer end surface of the placing plate portion 176 is in a state of abutment or proximity. The inner wall surface facing the corners of the protruding wall portions 211, 214.

The frame-like plate portion 177 of the diaphragm 163 shown in Fig. 4 is "the frame-shaped end surface 157 of the reservoir wall portion 36" and the cover shown in Fig. 5. In a state in which the frame-shaped surface portion 227" of the portion 161 is sandwiched, one of the lid portion mounting members 162 shown in FIG. 4 is inserted into the "insertion hole 198 formed in the lid portion 161" and "formed in the diaphragm 163". The insertion hole 178" of the mounting plate portion 175 is locked with the "screw hole 148 formed in the upper end surface 155 of the liquid storage cylinder wall portion 36". Further, the other cover mounting member 162 is inserted into the "insertion hole 199 formed in the cover portion 161" and the "insertion hole 179 formed in the mounting plate portion 176 of the diaphragm 163", and is locked in "formed in" A screw hole 149" of the upper end surface 156 of the wall portion 36 of the reservoir. In this way, the lid portion 161 and the diaphragm 163 are attached to the body member 21. As shown in FIGS. 2 and 3, the height from the frame-shaped surface portion 227 to the protruding end of the frame-shaped wall portion 215 is smaller than the thickness of the frame-like plate portion 177 of the diaphragm 163 in the mounted state. According to this, in the mounted state, a gap 230 is provided between the "front end surface of the lower end of the frame-shaped wall portion 215 of the lid portion 161" and the "upper end surface of the frame-shaped end surface 157 of the liquid storage tube wall portion 36".

The diaphragm 163 partitions the storage chamber 38 into a liquid chamber 231 for storing the brake fluid on the lower side and a gas chamber 232 on the upper side. Thereby, it is possible to suppress the brake fluid of the liquid chamber 231 from directly contacting the outside air and suppress the moisture absorption of the brake fluid. Moreover, the deformation of the diaphragm 163 can follow the fluctuation of the liquid amount of the brake fluid in the liquid chamber 231. The gas chamber 232 is connected to the atmosphere as will be described later.

The liquid storage cylinder wall portion 36 and the liquid reservoir bottom portion 37 of the main body member 21, the window member 122 shown in Fig. 3, the sealing member 123 and the diaphragm 163, and the lid mounting members 162 and 162 shown in Fig. 4 are It is provided in the upper part of the hydraulic cylinder 35 shown in Fig. 2, and constitutes a storage for the brake fluid storage. Liquid cylinder 10. According to this, the liquid storage cylinder 10 is integrally connected to the "master pump 11 that supplies the brake fluid to the ramming car sub-pump 59". The master pump 11 is disposed in a position where the traveling wind (or the traveling wind) can be directly contacted in the vehicle. Therefore, the liquid storage cylinder 10 receives the vehicle outside the liquid storage cylinder wall portion 36 and outside the cover portion 161. The flow of the atmosphere in walking.

As shown in FIG. 5, the frame-shaped surface portion 227 of the lid portion 161 is formed with two passage grooves 235 and 236 which are recessed in the vertical direction with respect to the frame-shaped surface portion 227. The passage grooves 235, 236 are formed at the time of casting. The passage grooves 235 and 236 can also be formed by cutting.

The passage groove 235 is formed by the groove portions 241 to 247. The groove portion 241 is formed at a position slightly closer to the side edge portion 193 from the center position in the left-right direction of the lid portion 161, and is formed from the end portion of the surface portion 222 on the protruding wall portion 212 side to the intermediate position on the protruding portion 202 side. The groove portion 241 is formed in a straight line that is orthogonal to the "direction in which the face portion 222 extends." The groove portion 242 extends from the end portion of the groove portion 241 on the side of the protruding portion 202 to the front position of the insertion hole 198 in the face portion 225 toward the face portion 225 side along the extending direction of the face portion 222 through the intermediate position in the front-rear direction of the face portion 222. until. The groove portion 242 is formed in a straight line like the face portion 222.

The groove portion 243 extends from the end portion on the surface portion 225 side of the groove portion 242 to the surface portion 223 side in the face portion 225 through the insertion hole 198 of the face portion 225 and the protruding portion 205. The groove portion 243 is formed to be perpendicular to the extending direction of the face portion 242, and the portion on the opposite side of the groove portion 242 is along the extending direction of the face portion 222, and the portion therebetween is "concentric with the insertion hole 198". The shape of the shape forms a curve. The groove portion 244 extends from the intermediate portion in the left-right direction of the face portion 223 from the end portion of the groove portion 243 to the opposite side of the groove portion 242 to the face portion 224 along the extending direction of the face portion 223. The groove portion 244 is formed in an arc shape similarly to the face portion 223.

The groove portion 245 extends from the intermediate portion in the front-rear direction of the face portion 224 from the end portion of the groove portion 244 to the opposite side of the groove portion 243 in the extending direction of the face portion 224 so as to extend slightly toward the center position in the left-right direction of the cover portion 161. The position on the side of the edge portion 193. The groove portion 245 is formed in a straight line like the face portion 224. The groove portion 246 is formed to extend perpendicularly to the extending direction of the face portion 224 from the end portion of the groove portion 245 with respect to the groove portion 244, and extends to the side of the protruding portion 204, and passes over the end portion of the protruding portion 204 side of the face portion 224, and penetrates in the front-rear direction. The protrusion 204. The groove portion 246 is disposed in the same linear shape as the groove portion 241. The groove portions 241 to 246 are disposed on the same plane as the groove bottom surface which becomes the top surface when mounted on the vehicle, and form a constant depth with respect to the frame-shaped surface portion 227.

The groove portion 247 is recessed from the inner end wall surface of the protruding wall portion 212 in the opposite direction to the protruding portion 202 from the end portion of the groove portion 241 opposite to the groove portion 242. As shown in FIG. 3, the groove portion 247 has an opening formed on the opposite end portion of the protruding wall portion 212 with respect to the groove portion 241, and an end portion on the groove portion 241 side is formed into a groove portion 241 which is more concave than the surface portion 222. The position of the bottom of the ditch.

The passage groove 235 is closed by the frame-shaped plate portion 177 of the diaphragm 163 from the groove portion 241 via the groove portion 242, the groove portions 243 to 245 shown in Fig. 5, to the groove portion 245 side of the groove portion 246 shown in Fig. 3 . section until. The passage groove 235 forms an atmospheric passage 251 between the diaphragm 163 and the diaphragm 163. The air passage 251 communicates with the air chamber 232 by "the inner opening portion 252 formed by the groove portion 246 and the inner edge portion of the mounting plate portion 174 of the diaphragm 163". In addition, the atmospheric passage 251 is directed toward the "projecting wall portion 212 of the lid portion 161 which becomes the outer portion of the reservoir 10" and the "reservoir wall portion 36" by the outer opening portion (opening portion) 253 at the lower end of the groove portion 247. The gap 230 between the upper end faces 152" forms an opening.

In other words, the air passage 251 is formed in the lid portion 161. As shown in Fig. 1, the outer opening portion 253 that opens toward the outside is provided on the traveling direction side of the vehicle by the shape of the passage groove 235, and passes through the storage chamber 38 (please refer to The inner opening 252 at a position shifted from the outer opening 253 is communicated with the air chamber 232 around the second drawing and the third drawing (please refer to FIG. 2 and FIG. 3). In the air passage 251, the groove portion 242 is curved with respect to the groove portion 241, the groove portion 243 is curved with respect to the groove portion 242, the groove portion 243 is curved, and the groove portion 244 is curved with respect to the groove portion 243, and the groove portion 245 is curved with respect to the groove portion 244, and the groove portion 245 is curved. In the groove portion 245, the groove portion 246 is curved to form a labyrinth structure.

As shown in Fig. 5, the passage grooves 236 are formed by the groove portions 261 to 267. The groove portion 261 is formed at a position slightly closer to the side edge portion 191 from the center position in the left-right direction of the lid portion 161, and is formed from the end portion of the surface portion 222 on the protruding wall portion 212 side to the intermediate position on the protruding portion 202 side. The groove portion 261 is formed in a straight line that is orthogonal to the "direction in which the face portion 222 extends." The groove portion 262 passes through the intermediate portion in the front-rear direction of the face portion 222 from the end portion of the groove portion 261 on the protruding portion 202 side, along the extending direction of the face portion 222, Extends to the face 221. The groove portion 262 is formed in a straight line like the surface portion 222 and is disposed on the same straight line as the groove portion 242.

The groove portion 263 extends from the end portion of the surface portion 221 on the side of the surface portion 221 to the front surface of the insertion hole 199 in the surface portion 226 along the extending direction of the surface portion 221 through the intermediate portion of the surface portion 221 in the left-right direction. The groove portion 263 is formed in an arc shape similarly to the face portion 221. The groove portion 264 extends from the end portion on the surface portion 226 side of the groove portion 263 to the surface portion 224 side of the face portion 226 through the insertion hole 199 of the face portion 226 and the protruding portion 206. The groove portion 264 is connected to the groove portion 263 along the extending direction of the face portion 224, and the portion on the opposite side with respect to the groove portion 263 is perpendicular to the extending direction of the face portion 224, and the portion therebetween is "concentric with the insertion hole 199". The way to form a bend.

The groove portion 265 extends from the intermediate portion in the front-rear direction of the face portion 224 from the end portion of the groove portion 264 to the opposite side of the groove portion 263 in the extending direction of the face portion 224 so as to extend slightly to the center position in the left-right direction of the cover portion 161. The position on the side of the edge portion 191. The groove portion 265 is formed in a straight line like the face portion 224, and is disposed on the same straight line as the groove portion 245. The groove portion 266 is formed to extend perpendicularly to the extending direction of the face portion 224 from the end portion of the groove portion 265 with respect to the groove portion 264, and extends to the side of the protruding portion 204, and passes over the end portion of the protruding portion 204 side of the face portion 224, and penetrates in the front-rear direction. The protrusion 204. The groove portion 266 is disposed in the same linear shape as the groove portion 261. The groove portions 261 to 266 are disposed on the same plane as the groove bottom surface which becomes the top surface when mounted on the vehicle, and form a constant depth with respect to the frame-shaped surface portion 227.

The groove portion 267 is recessed from the inner end wall surface of the protruding wall portion 212 in the opposite direction to the protruding portion 202 from the end portion of the groove portion 261 opposite to the groove portion 262. The groove portion 267 is formed with an opening toward the protruding distal end portion of the protruding wall portion 212 with respect to the groove portion 261, and an end portion on the groove portion 261 side is formed at a position of the groove bottom surface of the groove portion 261 which is recessed from the surface portion 222. Here, in the above-described mounted state, the frame-like plate portion 177 of the diaphragm 163 is elastically deformed, and the outer peripheral surface thereof is in contact with the entire inner peripheral wall surface except for the groove portions 247 and 267 of the frame-shaped wall portion 215.

The passage groove 236 is closed by the frame-like plate portion 177 of the diaphragm 163 from the groove portion 261 to the portion on the groove portion 265 side of the groove portion 266 via the groove portions 262 to 265. The passage groove 236 forms an air passage 271 between the diaphragm 163 and the diaphragm 163. The air passage 271 communicates with the air chamber 232 shown in Fig. 3 by "the inner opening portion 272 formed by the groove portion 266 and the inner edge portion of the mounting plate portion 174 of the diaphragm 163". Further, the atmospheric passage 271 shown in Fig. 5 is directed to the outer opening (opening) 273 at the lower end of the groove portion 267, and is directed between the protruding wall portion 212 shown in Fig. 3 and the reservoir wall portion 36. The gap 230 forms an opening.

In other words, the air passage 271 is formed in the lid portion 161, and as shown in Fig. 1, the outer opening portion 273 that opens toward the outside is provided on the traveling direction side of the vehicle by the shape of the passage groove 236, and passes through the storage chamber 38 (please refer to The inner opening 272 at a position shifted from the outer opening 273 is connected to the air chamber 232 around the second drawing and the third drawing (please refer to FIGS. 2 and 3). The atmospheric passage 271 forms a groove portion 262 with respect to the groove portion 261 The groove portion 263 is curved with respect to the groove portion 262, and the groove portion 264 is curved with respect to the groove portion 263, and the groove portion 264 is curved. The groove portion 265 is curved with respect to the groove portion 264, and the groove portion 266 is curved with respect to the groove portion 265, and becomes a labyrinth. structure.

The master pump 11 is larger than the atmospheric passages 251 and 271, and the gas chamber 232 shown in Fig. 2 is maintained substantially at atmospheric pressure. In this way, even if the brake friction material is reduced, the volume of the hydraulic chamber on the side of the brake cylinder 59 is increased, and the executed "replenishment of the brake fluid from the liquid chamber 231 of the storage chamber 38 to the hydraulic chamber 101" can be performed in the liquid chamber 231. Maintain atmospheric pressure.

In the master cylinder described in the above-mentioned Patent Document 1, a diaphragm is formed to partition the inside of the reservoir chamber into a vertical position, and a passage for "a chamber higher than the diaphragm" to communicate with the outside air is stored. The left and right sides of the liquid cylinder are open to the outside. The traveling wind is formed to flow from the front to the rear along the left and right sides of the master pump, and the passage forms a vertical direction with respect to the flow of the traveling wind. Therefore, the Venturi effect derived from the flow of the atmosphere during the running of the vehicle may cause the opening of the passage to be a negative pressure. According to this, once the brake fluid is soaked into the diaphragm or the like from the liquid chamber side to the air chamber side, the brake fluid will be sucked out from the opening due to the flow of the atmosphere during the vehicle traveling, and may leak to the outside. Possible. Further, although an additional diaphragm plate can be provided to suppress leakage of the brake fluid of the air chamber to the outside, in this case, the number of parts is increased to cause an increase in cost.

In contrast, the master pump 11 including the above-described reservoir 10 communicates the gas chamber 232 with an atmospheric passage of external air (or simply external air). In the forward direction side of the vehicle (the windward side of the traveling wind), there are external opening portions 253 and 273 that open to the outside, and the storage chambers that are displaced from the outer opening portions 253 and 273 are passed around the storage chamber 38. The rear side of 38, that is, the inner opening portions 252, 272 on the vehicle rearward direction (referring to the rear of the traveling direction) communicates with the air chamber 232. As a result, even if there is a flow of the atmosphere during traveling of the vehicle, it is difficult for the external openings 253 and 273 to form a negative pressure. According to this, even if the brake fluid is present on the gas chamber 232 side, it is possible to suppress the brake fluid from being sucked out from the outer openings 253 and 273 due to the flow of the atmosphere during the vehicle running. According to this, even if the diaphragm plate is not provided, the possibility that the brake fluid leaks to the outside can be reduced. Further, since "the traveling wind is introduced into the air chamber 232 from the outer opening portions 253, 273", the followability of the diaphragm 163 to the brake fluid level is improved, and the supply performance of the brake fluid toward the brake cylinder pump 59 can be improved.

Further, since the outer opening portions 253 and 273 are opened downward in the protruding wall portion 212 of the front edge portion 192, the front edge portion 192 of the main plate portion 190 serves as a cover to prevent invasion of rainwater or foreign matter into the air passages 251 and 271. . As a result, it is possible to suppress entry of rainwater, foreign matter, or the like into the air chamber 232.

In the air passage 251, the groove portion 242 is curved with respect to the groove portion 241, the groove portion 243 is curved with respect to the groove portion 242, the groove portion 243 is curved, and the groove portion 244 is curved with respect to the groove portion 243, and the groove portion 245 is curved with respect to the groove portion 244, and the groove portion 245 is curved. In the groove portion 245, the groove portion 246 is curved to form a labyrinth structure. Further, the air passage 271 is curved with respect to the groove portion 261, and is formed to be curved with respect to the groove portion 262. The groove portion 263 is curved, and the groove portion 264 is curved with respect to the groove portion 263, and the groove portion 264 is curved. The groove portion 265 is curved with respect to the groove portion 264, and the groove portion 266 is curved with respect to the groove portion 265 to form a labyrinth structure. As a result, the atmospheric passages 251 and 271 increase the pressure loss due to the "bending portions of the dynamic pressure (so-called RAM pressure) generated by the traveling wind", thereby suppressing the influence of the hydraulic pressure rise caused by the traveling wind.

Here, the dynamic pressure P generated by the traveling wind can be obtained by the following calculation formula.

P = 1/2 × ρ × V 2

The density ρ of the air is ρ = 1.2 kg/m ³ , and V is the volume. If the minimum hydraulic pressure at which the brake cylinder 59 is actuated is set to 0.05 MPa, even in the case where there is no pressure loss due to the labyrinth structure, the calculation is performed. In the above, the traveling speed of the vehicle starts from 350 km/h, and the influence on the brake cylinder 59 is started. As long as the labyrinth structure is provided, the influence of the traveling wind can be further suppressed.

In the above-described first embodiment, the groove portion 242 and the groove portion 262 shown in Fig. 5 may be connected to each other by "additional groove portions which are arranged on the same straight line". Atmospheric passages 251, 271. In addition, the groove portion 245 and the groove portion 265 may be connected to each other by "additional groove portions that are arranged on the same straight line" to connect the atmosphere passages 251 and 271. .

"Second embodiment"

Next, in the second embodiment, mainly based on Fig. 6 and focusing on The difference between the embodiments will be described. The parts common to the first embodiment are denoted by the same reference numerals and the same reference numerals.

In the second embodiment, the lid portion 161A shown in Fig. 6 having a partial structure is used for the lid portion 161 of the first embodiment. The cover portion 161A is formed with passage grooves 235A and 236A which are partially different from the passage grooves 235 and 236 of the first embodiment. The passage grooves 235A, 236A are also formed at the time of casting. In Fig. 6, the frame-like plate portion 177 of the diaphragm 163 is displayed with a two-point lock line with respect to the lid portion 161A displayed in a solid line.

In the passage groove 235A, the groove portions 241 to 243 and 247 which are the same as those of the first embodiment are formed, and the groove portion 246 of the first embodiment is not formed, and the groove portions 244A and 245A different from the first embodiment are formed.

The groove portion 244A extends from the end portion of the groove portion 243 opposite to the groove portion 242 in the surface portion 225 so as to extend to a specific position on the side of the face portion 223 along the extending direction of the face portion 223. The groove portion 244A is formed in a straight line along a direction perpendicular to the "projecting wall portion 212". The groove portion 245A extends in the opposite direction from the protruding wall portion 213 from the end portion of the groove portion 244A opposite to the groove portion 243, and penetrates the protruding portion 205 in the left-right direction. The groove portions 241 to 243, 244A, and 245A are disposed on the same plane when the vehicle is placed on the top surface, and are formed to have a constant depth from the frame-shaped surface portion 227.

The passage groove 235A is formed such that the groove portions 241 to 243, the groove portion 244A, and the portion of the groove portion 244A on the groove portion 244A side are closed by the diaphragm 163 similar to that of the first embodiment, and are formed between the diaphragm 163 and the diaphragm 163. It becomes an atmospheric passage 251A. The air passage 251A communicates with the air chamber 232 by the inner opening portion 252A formed by the groove portion 245A and the inner edge portion of the mounting plate portion 175 of the diaphragm 163, and is opposed to the air chamber 232 by the groove portion 247. The outer opening portion 253 of the opposite end portion of the groove portion 241 is opened to the outside of the liquid storage cartridge 10. In other words, the atmosphere passage 251A is formed in the lid portion 161A, and has an outer opening portion 253 that opens to the outside in the forward direction side of the vehicle by the shape of the passage groove 235A, and passes through the periphery of the storage chamber 38 and is deflected from the outer opening portion 253. The inner opening portion 252A at the position where it is moved is connected to the air chamber 232. The atmosphere passage 251A forms a labyrinth structure in which the groove portion 242 is curved with respect to the groove portion 241, the groove portion 243 is curved with respect to the groove portion 242, the groove portion 243 is curved, and the groove portion 244A is curved with respect to the groove portion 243, and the groove portion 244A is curved with respect to the groove portion 244A. The groove portion 245A is curved.

In the passage groove 236A, the groove portions 261, 262, and 267 which are the same as those in the first embodiment are formed, and the groove portions 265 and 266 of the first embodiment are not formed, and the groove portions 263A and 264A different from the first embodiment are formed.

The groove portion 263A extends from the intermediate portion of the surface portion 221 in the left-right direction from the end portion of the groove portion 262 opposite to the groove portion 261 to the surface portion 226 along the extending direction of the surface portion 221 . The groove portion 263A is formed in an arc shape similarly to the face portion 221. The groove portion 264A extends from the end portion of the groove portion 263A opposite to the groove portion 262 in the opposite direction of the protruding wall portion 211, and penetrates the protruding portion 206 in the left-right direction. The groove portions 261, 262, 263A, and 264A are disposed on the same bottom surface as the top surface of the groove when the vehicle is mounted. The plane forms a certain depth from the frame-shaped surface portion 227.

The passage groove 236A is formed such that the groove portions 261 and 262, the groove portion 263A, and the groove portion 263A on the side of the groove portion 263A are closed by the diaphragm 163 similar to that of the first embodiment, and an air passage 271A is formed between the passage portion 163 and the diaphragm 163. The air passage 271A communicates with the air chamber 232 by the inner opening portion 272A formed by the groove portion 264A and the inner edge portion of the mounting plate portion 176 of the diaphragm 163, and is opposed to the air chamber 232 by the groove portion 267. The outer opening portion 273 of the opposite end portion of the groove portion 261 is opened to the outside of the reservoir 10. In other words, the atmosphere passage 271A is formed in the lid portion 161A, and has an outer opening portion 273 that opens to the outside in the forward direction side of the vehicle by the shape of the passage groove 236A, and passes through the periphery of the storage chamber 38 and is displaced from the outer opening portion 273. The inner opening portion 272A at the position where it is moved is connected to the air chamber 232. The atmosphere passage 271A forms a labyrinth structure in which the groove portion 262 is curved with respect to the groove portion 261, and the groove portion 263A is curved with respect to the groove portion 262, and the groove portion 264A is curved with respect to the groove portion 263A.

According to the second embodiment, the labyrinth structure of the air passages 251A and 271A is simpler than that of the first embodiment, whereby the passage grooves 235A and 236A can be easily manufactured, and the manufacturing cost can be reduced.

"Third embodiment"

Next, the third embodiment will be described mainly with reference to Fig. 7 and a difference from the first embodiment. The parts common to the first embodiment are denoted by the same reference numerals and the same reference numerals.

In the third embodiment, the lid portion 161B shown in Fig. 7 having a partial structure is used for the lid portion 161 of the first embodiment. The cover portion 161B is formed with passage grooves 235B and 236B which are partially different from the passage grooves 235 and 236 of the first embodiment. The passage grooves 235B, 236B are also formed at the time of casting. In Fig. 7, the frame-like plate portion 177 of the diaphragm 163 is shown with a two-point lock line with respect to the lid portion 161B displayed in a solid line.

In the passage groove 235B, the groove portions 241, 242, and 247 which are the same as those in the first embodiment are formed, and the groove portions 244 to 246 of the first embodiment are not formed, and the groove portion 243B different from the first embodiment is formed. The groove portion 243B extends from the end portion of the groove portion 242 opposite to the groove portion 241 in the opposite direction of the protruding wall portion 212, and penetrates the protruding portion 205 in the front-rear direction. The groove portions 241, 242, and 243B are disposed on the same plane as the groove bottom surface which becomes the top surface when mounted on the vehicle, and are formed to have a constant depth from the frame-shaped surface portion 227.

The passage grooves 235B are formed such that the grooves 241 and 242 and the groove portion 242 on the side of the groove portion 242 are closed by the diaphragm 163 similar to that of the first embodiment, and an air passage 251B is formed between the diaphragm 163 and the diaphragm 163. The air passage 251B communicates with the air chamber 232 by the inner opening portion 252B formed by the groove portion 243B and the inner edge portion of the mounting plate portion 175 of the diaphragm 163, and is opposed to the air chamber 232 by the groove portion 247. The outer opening portion 253 of the opposite end portion of the groove portion 241 is opened to the outside of the liquid storage cartridge 10. In other words, the atmosphere passage 251B is formed in the lid portion 161B, and has an outer opening toward the outside in the forward direction side of the vehicle by the shape of the passage groove 235B. The opening portion 253 communicates with the gas chamber 232 through the inner opening portion 252B at a position shifted from the outer opening portion 253 around the storage chamber 38. The atmosphere passage 251B forms a labyrinth structure in which the groove portion 242 is curved with respect to the groove portion 241, and the groove portion 243B is curved with respect to the groove portion 242.

In the passage groove 236B, the groove portions 261 and 267 which are the same as those in the first embodiment are formed, and the groove portions 264 to 266 of the first embodiment are not formed, and the groove portions 262B and 263 which are different from the first embodiment are formed.

The groove portion 262B extends from the end portion of the groove portion 261 on the side of the protruding portion 202 to the front side of the face portion 221 along the extending direction of the face portion 222 through the intermediate portion in the front-rear direction of the face portion 222. The groove portion 262B is formed in a straight line like the surface portion 222 and is disposed on the same straight line as the groove portion 242. The groove portion 263B extends from the end portion of the groove portion 262B opposite to the groove portion 261 in the opposite direction of the protruding wall portion 212, and penetrates the protruding portion 202 in the front-rear direction. The groove portions 261, 262B, and 263B are disposed on the same plane as the groove bottom surface which becomes the top surface when mounted on the vehicle, and are formed to have a constant depth from the frame-shaped surface portion 227.

The passage groove 236B is formed such that the groove portions 261 and 262 and the portion on the groove portion 262B side of the groove portion 263B are closed by the diaphragm 163 similar to that of the first embodiment, and an air passage 271B is formed between the diaphragm 163 and the diaphragm 163. The air passage 271B communicates with the air chamber 232 by the inner opening portion 272B formed by the groove portion 263B and the inner edge portion of the mounting plate portion 172 of the diaphragm 163, and is opposed to the air chamber 232 by the groove portion 267. Ditch The outer opening portion 273 of the opposite side end portion of the opening 273 opens toward the outside of the liquid storage cartridge 10. In other words, the atmosphere passage 271B is formed in the lid portion 161B, and has an outer opening portion 273 that opens to the outside in the forward direction side of the vehicle by the shape of the passage groove 236B, and passes through the periphery of the storage chamber 38 and is displaced from the outer opening portion 273. The inner opening portion 272B at the position where it is moved is connected to the air chamber 232. The atmosphere passage 271B forms a labyrinth structure in which the groove portion 262B is curved with respect to the groove portion 261, and the groove portion 263B is curved with respect to the groove portion 262B.

According to the third embodiment, the labyrinth structure of the air passages 251B and 271B is of course simpler than that of the first embodiment, and is similarly simpler than the second embodiment. Accordingly, the passage grooves 235B and 236B are provided. The production becomes easy and the manufacturing cost can be reduced.

"Fourth embodiment"

According to Fig. 8, a fourth embodiment of the present invention will be described. In the fourth embodiment, as shown in Fig. 8, a passage groove 335 which serves as an air passage is formed in the frame-shaped end surface 357 of the reservoir wall portion 336 of the main body member 321. In detail, one end side of the passage groove 335 is provided in the frame-shaped end surface 357, and is formed in the forward direction side of the vehicle, and communicates with the groove portion 341 having the outer opening portion 353 which opens toward the outside. In addition, the other end side of the passage groove 335 is connected to the opening of the air chamber 232 through the groove portion 365 which is a part of the passage groove 335 via the "connection hole 301 formed in the frame-shaped plate portion 377 of the diaphragm 363". The groove portion 246" of the lid portion 361. In this way, in the fourth embodiment, it is formed in the liquid storage tube. The groove portion 341 and the passage groove 335 of the wall portion 336, and the communication hole 301 formed in the diaphragm 363 and the groove portion 246 of the lid portion 361 constitute an air passage. According to the above-described configuration, in the fourth embodiment, even if the brake fluid is present on the gas chamber 232 side, the brake fluid can be prevented from being sucked out from the outer opening portion 353 by the flow of the atmosphere during the vehicle running. According to this, even if the diaphragm plate is not provided, the possibility that the brake fluid leaks to the outside can be reduced.

As described above, in the first embodiment, the air passages 251 and 271 are formed by forming the passage grooves 235 and 236 in the lid portion 161. In the second embodiment, the passage grooves 235A and 236A are formed in the lid portion 161A. In the third embodiment, the atmospheric passages 251B and 271B are formed by forming the passage grooves 235B and 236B in the lid portion 161B. On the other hand, it is also possible to form a passage groove having the same shape on the frame-shaped end surface 157 of the liquid storage cylinder wall portion 36, and an air passage is formed between the diaphragm and the diaphragm.

The external opening of the atmospheric passage can be disposed at any position as long as it is on the forward direction side of the vehicle, and the number thereof can be arbitrarily set. The internal opening of the atmospheric passage can be disposed at any position as long as it is offset from the external opening, and the number thereof can be arbitrarily set.

The invention is equally applicable to an individual that is separate from the master pump and that is connected to the reservoir of the master pump through a pipe.

In the above embodiment, the lid portions 161, 161A, and 161B are formed of a metal member such as cast iron, but a resin member such as plastic or rubber may be used. In addition, although the cover portions 161, 161A, 161B It is an integrally molded product formed by casting, but it may be formed by sintering or the like.

The above embodiment is a master cylinder having a hydraulic cylinder that is slidable by "a piston that is propelled by the operation of the brake lever"; and is provided at an upper portion of the hydraulic cylinder for storing the brake fluid a liquid storage cylinder having a liquid storage wall portion, a cover portion and a diaphragm, the liquid storage tube wall portion being formed around a storage chamber for storing the brake fluid, and the upper portion forming an opening and the outer portion is formed a flow of the atmosphere during the running of the vehicle, the cover portion covers an opening of the wall portion of the liquid storage cylinder, and the diaphragm divides the storage chamber into a liquid chamber and a gas chamber, and is provided at the cover portion or the wall portion of the liquid storage cylinder The air passage has an opening that opens toward the outside on the traveling direction side of the vehicle, and communicates with the air chamber at a position shifted from the opening by the periphery of the storage chamber.

Further, the above embodiment is a liquid storage cylinder that is connected to the "master pump for supplying the brake fluid to the ramming car sub-pump" and that can store the brake fluid, and the liquid storage cylinder has a wall portion, a lid portion, and a membrane of the liquid storage cylinder a wall, the wall of the liquid storage cylinder is formed around a storage chamber for storing the brake fluid, and an upper portion forms an opening, and the outer side bears the flow of the atmosphere during running of the vehicle, and the cover portion covers the opening of the wall portion of the liquid storage cylinder The diaphragm partitions the storage chamber into a liquid chamber and a gas chamber, and an air passage is provided in the lid portion or the wall portion of the liquid storage cylinder, and the air passage has an opening portion opening toward the outside on a side of the vehicle traveling direction. The air chamber is communicated with the periphery of the storage chamber at a position offset from the opening.

The aforementioned atmospheric passage is in the aforementioned cover portion and the aforementioned liquid storage tube A bend is formed between the wall portions. Further, the air passage is communicated with the air chamber on the backward direction side of the vehicle. Further, the air passage communicates with the air chamber on the side direction side of the vehicle. Further, the air passage communicates with the air chamber on the forward direction side of the vehicle.

As described above, the lid portion or the wall portion of the liquid storage cylinder is provided with an opening that opens toward the outside in the direction of the forward direction of the vehicle, and passes through the periphery of the storage chamber, and is connected at a position offset from the opening portion. The atmospheric passage to the air chamber makes it difficult to form a negative pressure in the opening even in the atmosphere of the vehicle during traveling. According to this, even if the brake fluid is present on the air chamber side, it is possible to suppress the brake fluid from being sucked out from the opening due to the flow of the atmosphere during the vehicle running.

10‧‧‧reservoir

11‧‧‧Master pump

15‧‧‧ steering rod

16‧‧‧Installation Department

21‧‧‧ Body components

22‧‧‧ 承座

23‧‧‧Locking members

24‧‧‧ brake lever

25‧‧‧Support members

30‧‧‧Installation

31‧‧‧Tie rod support

32‧‧‧Mirror Installation Department

35‧‧‧Hydraulic cylinder

118‧‧‧ convex

161‧‧‧ 盖部

162‧‧‧Cover mounting components

191, 193‧‧‧ side edge

192‧‧‧ Front edge

194‧‧‧ trailing edge

201~206‧‧‧ protruding parts

211~214‧‧‧ protruding wall

235, 236‧‧ ‧ access trench

241~247‧‧‧Ditch

251, 271‧‧‧ atmosphere access

252, 272‧‧‧Internal opening (opening)

253, 273‧‧‧ External opening (opening)

261~267‧‧‧Ditch

Claims (10)

A master pump has: a hydraulic cylinder configured to slidably push a piston advanced by operation of a brake lever; and a liquid storage cartridge disposed at an upper portion of the hydraulic cylinder for storing brake fluid, the liquid storage cartridge having: a wall portion of the liquid storage cylinder is formed around a storage chamber for storing the brake fluid, and an upper portion forms an opening, the outer side is subjected to the flow of the atmosphere during running of the vehicle; and a cover portion covers the opening of the wall portion of the liquid storage cylinder; a diaphragm that partitions the storage chamber into a liquid chamber and a gas chamber, wherein an air passage is provided in the wall portion of the cover portion or the liquid storage cylinder, and the air passage has an opening opening to the outside on a forward direction side of the vehicle And passing through the air chamber at a position offset from the opening by the periphery of the storage chamber. The master cylinder according to claim 1, wherein the air passage is formed by bending between the lid portion and the wall portion of the liquid storage cylinder. The master cylinder according to claim 1, wherein the air passage communicates with the air chamber in a backward direction side of the vehicle. The master cylinder according to claim 1, wherein the air passage communicates with the air chamber on a side direction side of the vehicle. The master cylinder as recited in claim 2, wherein the foregoing The atmospheric passage communicates with the air chamber on the forward direction side of the vehicle. The utility model relates to a liquid storage cylinder which is connected to a main pump which supplies the brake fluid to the brake pump, and can be used for storing the brake fluid. The liquid storage cylinder is characterized in that: the liquid storage cylinder wall portion surrounds the brake device. a liquid storage storage chamber is formed, and an upper portion forms an opening, the outer side is subjected to the flow of the atmosphere during walking of the vehicle; and a cover portion covers an opening of the wall portion of the liquid storage cylinder; and a diaphragm that separates the storage chamber into a liquid chamber and In the air chamber, an air passage is provided in the cover portion or the wall portion of the liquid storage cylinder, and the air passage has an opening that opens toward the outside in the forward direction side of the vehicle, and is separated from the opening portion by the periphery of the storage chamber. The moved position is connected to the aforementioned air chamber. The liquid storage cartridge according to claim 6, wherein the air passage is formed by bending between the lid portion and the wall portion of the liquid storage cylinder. The liquid storage cartridge according to claim 6, wherein the air passage communicates with the air chamber in a backward direction side of the vehicle. The liquid storage cartridge according to claim 6, wherein the air passage communicates with the air chamber on a side surface side of the vehicle. The liquid storage cartridge according to claim 7, wherein the air passage communicates with the air chamber on a traveling direction side of the vehicle.