TWI651225B - Main pump for vehicles - Google Patents

Abstract

The present invention provides a master cylinder for a vehicle which can improve manufacturing efficiency.

The piston (77) and the "piston (77) are movable hydraulic cylinders (37)" which are propelled by the operation of the operating element (23), and the hydraulic cylinder (37) is provided with "through the hydraulic pressure" a radial hole (58) of the cylinder (37), and a movement restricting member (30) that restricts movement of the piston (77) to the hydraulic cylinder (37), and the movement restricting member (30) will "detect the operating element (23) The detecting member (29) for operation is fixed to the hydraulic cylinder (37).

Description

Main pump for vehicles

The present invention relates to a master cylinder for a vehicle.

A master pump having a structure in which a covering member that covers an opening portion of a hydraulic cylinder is attached to a hydraulic cylinder and a piston is restrained by the covering member by a locking member that is locked to an opening of the hydraulic cylinder Pull out (see, for example, Patent Document 1).

[Previous Technical Literature] [Patent Document]

Patent Document 1: Japanese Unexamined Publication No. SHO 58-54362

The above described master pump is quite time consuming to manufacture.

Accordingly, it is an object of the present invention to provide a master cylinder for a vehicle which can improve manufacturing efficiency.

In order to achieve the above object, the present invention has a configuration in which a hydraulic cylinder is provided with a movement restricting member for restricting movement of the hydraulic cylinder by a "radial hole formed in the hydraulic cylinder", the movement restricting member The detecting member for "operation for detecting the operating element" is fixed to the aforementioned hydraulic cylinder.

According to the present invention, the manufacturing efficiency can be improved.

11, 11A, 11B, 11C‧‧‧ master cylinders for vehicles

23‧‧‧ brake lever (operating components)

29, 29B‧‧‧ brake switch (detection member)

30, 30A, 30B‧‧‧Installation of threaded members (moving restriction members)

37, 37B‧‧‧ hydraulic cylinder

48‧‧‧ openings

58, 58‧‧‧ radial holes

77‧‧‧Piston

81C‧‧‧Dust boot body (flexible protective member)

130A, 130B, 130C‧‧‧ piston abutment members (circumferential members)

131B‧‧‧ inclined section

166C‧‧‧ Tapered tube (inclined part)

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

Fig. 2 is a front view showing a first embodiment of the present invention.

Fig. 3 is a side view showing the first embodiment of the present invention.

Fig. 4 is a cross-sectional view taken along the line X-X of Fig. 3 showing a third embodiment of the present invention.

Fig. 5 is an enlarged cross-sectional view showing an important part of Fig. 4 of the first embodiment of the present invention.

Fig. 6 is an enlarged cross-sectional view showing an important part corresponding to Fig. 5 showing a second embodiment of the present invention.

Fig. 7 is an enlarged cross-sectional view showing an important part corresponding to Fig. 5 showing a third embodiment of the present invention.

Figure 8 is a view corresponding to the fifth embodiment of the fourth embodiment of the present invention. An enlarged cross-sectional view of the important part.

"First embodiment"

The first embodiment of the present invention will be described with reference to Figs. 1 to 5 . As shown in FIG. 1 to FIG. 3, the first embodiment is a storage cylinder 10 which constitutes a reservoir-integrated vehicle master cylinder 11 which is a part of the master cylinder 11 for a vehicle. The master cylinder 11 for a vehicle is attached to a straddle type vehicle such as a locomotive, a three-wheel buggy, or a four-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 cylinder 11 for a vehicle 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 The directions are as follows: front, back, left, and right. In the first embodiment, the master cylinder 11 for a vehicle for front wheel braking 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 cylinder 11 for a vehicle is attached to a mounting portion 16 of a steering bar 15 indicated by a two-point lock line in the first drawing of the vehicle. The mounting portion 16 is located at the right side portion of the steering lever 15, and is a portion that extends in the left-right direction. The steering rod 15 is formed by appropriately bending a cylindrical pipe member, and at least "the outer peripheral surface of the mounting portion 16 for mounting the master cylinder 11 for a vehicle" is a cylindrical surface.

The master cylinder 11 for a vehicle has "a main body member 20 and a seat 21 shown in Fig. 1" made of metal; and "two mounting bolts 22, 22 and a brake lever 23 shown in Figs. 2 and 3". (Operating element), support bolt 24, support nut 25, and cover member 26"; "two mounting screws 27, 27" shown in Fig. 1. Further, the master cylinder 11 for a vehicle has a brake switch 29 (detecting member) having a casing 28 made of synthetic plastic as shown in Figs. 2 and 3; and a mounting screw member 30 made of metal (moving) a restricting member), a locking washer 31, a spring washer 32, and a diaphragm 33 formed of an elastic material such as rubber shown in Fig. 4. Here, the brake switch 29 causes the contact inside the brake switch 29 to be turned ON or OFF by the operation of the brake lever 23, and is not shown in the drawing of the vehicle, but is provided to illuminate the brake light. member. In the present embodiment, the housing 28 of the brake switch 29 is made of synthetic resin, but may be made of metal or rubber.

The main body member 20 is an integrally molded product that is cast, and is disposed on the front side of the mounting portion 16 of the steering lever 15 as shown in Fig. 1 . In the main body member 20, a mounting seat portion 34 that protrudes rearward is formed on the right side portion thereof. The main body member 20 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 34 and the socket 21. The mounting seat portion 34 and the socket 21 are joined by the two mounting bolts 22 and 22 shown in Figs. 2 and 3, and the steering lever 15 is sandwiched.

In the lower portion of the right side portion of the main body member 20, as shown in Fig. 3, plate-shaped tie rod support portions 35, 35 projecting upwardly and forwardly (referring to a pair of upper and lower sides) are formed. The brake lever 23 is inserted into the above pull Between the rod support portions 35, 35. In this state, the support bolt 24 penetrates one of the tie rod support portion 35, the brake lever 23, and the other tie rod support portion 35 in the up and down direction, and is locked to the support nut 25. In this manner, the brake lever 23 is formed to be rotatable by the above-described tie rod support portions 35, 35, the support bolt 24 and the support nut 25, and at this time, the support bolt 24 is rotated as a center. As shown in Fig. 1, the brake lever 23 extends forward from the main body member 20 along the steering lever 15 in front of the steering lever 15. The main body member 20 is formed above the upper side of the right side portion as shown in FIG. 2 in the upper side of the "pull rod support portion 35" on the upper side in FIG. 3, and is not shown in the drawing. The mirror mounted mirror mounting portion 36.

The body member 20 is provided with a hydraulic cylinder 37 that extends leftward from the proximal end side of the tie rod support portions 35 and 35. The hydraulic cylinder 37 is disposed in the axial direction of the mounting portion 16 in front of the steering rod 15 shown in Fig. 1 . This hydraulic cylinder 37 is formed in the lower part of the main body member 20 as shown in FIG. In the upper portion of the body member 20, that is, the reservoir wall portion 38 is formed in the upper portion of the hydraulic cylinder 37. The liquid storage cylinder wall portion 38 has a cylindrical shape in the vertical direction and a "storage tank bottom 39 for closing the hydraulic cylinder 37 side" to form a storage chamber 40 for storing the brake fluid. The reservoir bottom 39 also constitutes the upper portion of the hydraulic cylinder 37.

The hydraulic cylinder 37 has a bottomed cylinder having a "cylinder cylinder portion 45 extending in the left-right direction" and a "cylinder bottom portion 46 disposed on the opposite side of the rod support portions 35 and 35 in the cylinder portion 45". shape. In the hydraulic cylinder 37, a hydraulic cylinder having an opening 48 on the side of the tie rod support portions 35 and 35 is formed inside the cylinder portion 45 and the cylinder bottom portion 46. Hole 47.

The cylinder bore 47 is along the axial direction of the mounting portion 16 of the steering rod 15 shown in Fig. 1 . As shown in Fig. 4, the cylinder bore 47 has a main hole portion 51 on the side of the cylinder bottom portion 46, a tapered hole portion 52 on the opposite side of the cylinder bottom portion 46 of the main hole portion 51, and a main hole in the tapered hole portion 52. The entrance and exit hole portion 53 on the opposite side of the portion 51. An end portion of the inlet/outlet hole portion 53 opposite to the main hole portion 51 constitutes an opening portion 48 of the hydraulic cylinder 37. The main hole portion 51 and the tapered hole portion 52 and the inlet and outlet hole portion 53 are formed such that the central axis thereof coincides with the central axis of the cylinder bore 47. The central axis of the cylinder bore 47 becomes the central axis of the hydraulic cylinder 37. Hereinafter, the central axis is referred to as a cylinder axis, and the direction along the central axis is referred to as a cylinder axis direction, and the direction orthogonal to the "central axis of the hydraulic cylinder 37" is referred to as a cylinder radial direction, which will be bypassed. The direction of the central axis of the hydraulic cylinder 37 is referred to as the cylinder circumferential direction.

As shown in Fig. 5, among the cylinder bores 47, the main hole portion 51 has a cylindrical inner peripheral surface 51a. The tapered hole portion 52 has a tapered enlarged diameter inner peripheral surface 52a that expands in diameter (indicated in diameter) from the end edge portion on the opening portion 48 side of the inner circumferential surface 51a and extends toward the opening portion 48 side; The tapered inner diameter surface 52b of the inner circumferential surface 51a of the radial inner circumferential surface 52a has an enlarged diameter and extends toward the opening 48 side. In the tapered hole portion 52, the amount of inclination obtained by dividing the diameter difference at both ends in the axial direction by the distance between both ends in the axial direction is such that the expanded diameter inner peripheral surface 52b is larger than the expanded diameter inner peripheral surface 52a.

The entrance/exit hole portion 53 has a cylindrical inner peripheral surface 53a, and a diameter reduction from the end edge portion on the opposite side of the opening portion 48 of the inner peripheral surface 53a (refer to the diameter) The reduced-diameter inner peripheral surface 53b that extends toward the opposite side of the opening 48, and the bottom surface 53c that extends inward in the radial direction of the cylinder from the inner peripheral edge portion of the reduced-diameter inner peripheral surface 53b. The inner peripheral edge portion of the bottom surface 53c is connected to the "opposite side of the expanded diameter inner peripheral surface 52a of the expanded diameter inner peripheral surface 52b of the tapered hole portion 52". The bottom surface 53c is formed in parallel with the "surface orthogonal to the cylinder axis".

As shown in Fig. 4, the length of the main hole portion 51 in the axial direction of the cylinder is longer than that of the inlet hole portion 53, and the length in the direction of the cylinder axis is the longest in the cylinder bore 47. The main hole portion 51 has an inner diameter smaller than that of the inlet and outlet hole portion 53, and has a minimum diameter in the cylinder bore 47 in the radial direction of the cylinder. The inlet/outlet hole portion 53 is disposed on the most opposite side of the cylinder bottom portion 46 in the cylinder bore 47.

In the cylinder portion 45, a mounting seat 54 to which the brake switch 29 is attached is formed at an outer lower portion near the boundary between the main hole portion 51 and the inlet and outlet hole portion 53. The mount 54 has a main seat portion 55 on the side of the main hole portion 51 in the axial direction of the cylinder, and a protruding seat portion 56 that protrudes downward from the main seat portion 55 and on the side of the inlet and outlet hole portion 53 in the direction of the cylinder axis. The wall portion 57 on the side of the main seat portion 55 of the protruding portion 56 is formed in parallel with the "surface orthogonal to the cylinder axis". The mount 54 forms a stepped shape (stepped shape).

Then, in the cylinder portion 45, a radial hole 58 parallel to the radial direction of the cylinder is formed at the position of the protruding seat portion 56 of the mount 54. The radial hole 58 is a threaded hole that is perpendicular from the lower surface of the protruding seat portion 56 toward the lower surface and is formed to face upward. The radial hole 58 forms an opening toward the inner peripheral surface 53a of the inlet and outlet hole portion 53.

At the bottom 46 of the hydraulic cylinder, running through the bottom 46 of the hydraulic cylinder A threaded hole portion 59 is formed. In the screw hole portion 59, although not shown in the drawings, the bolt that "attaches the socket of the brake pipe to the hydraulic cylinder 37" is locked. A passage for connecting the inside of the main hole portion 51 to the brake pipe is formed in the bolt. The brake pipe is connected to a brake cylinder that is disposed on a wheel side such as a brake device. The cylinder bottom 46 is formed with a restricting projection 61 that protrudes toward the opposite side with respect to the cylinder portion 45 and that restricts the rotation of the stem of the brake pipe.

In the bottom portion 39 of the reservoir, the first communication hole 62 that "connects the inside of the main hole portion 51 with the storage chamber 40" is formed in parallel with respect to the cylinder radial direction. The first communication hole 62 is a stepped hole (refer to a hole having a stepped step) whose diameter is gradually reduced from the storage chamber 40 side toward the main hole portion 51 side. Further, in the bottom portion 39 of the reservoir, a second communication hole (not shown) is formed on the side of the cylinder bottom portion 46 from the first communication hole 62.

The liquid storage cylinder wall portion 38 is formed by being disposed on the side of the hydraulic cylinder bottom portion 46, that is, the side wall portion 65 disposed on the left side; and the front wall portion 66 disposed on the front side; and the bottom of the hydraulic cylinder 46 is disposed on the opposite side, that is, the side wall portion 67 disposed on the right side, and the rear wall portion 68 shown in Fig. 2 on the rear side. In other words, the reservoir wall portion 38 is formed in a quadrangular cylindrical shape. The liquid storage cylinder wall portion 38 is surrounded by the side wall portion 65, the front wall portion 66, and the side wall portion 67 shown in Fig. 4, and the rear wall portion 68 shown in Fig. 2, and surrounds the storage chamber 40 shown in Fig. 4 Formed with an opening formed in the upper portion thereof.

The diaphragm 33 has a frame-shaped plate portion 69 which is placed on the upper surface of the wall portion 38 of the liquid storage cylinder to form a square frame shape, and a frame-shaped plate portion 69 of the frame-shaped plate portion 69. a cylindrical outer tubular portion 70 having an inner peripheral edge portion extending downward; a frame-shaped lower plate portion 71 extending inward from the lower end edge portion of the outer tubular portion 70; and an inner peripheral edge portion of the lower plate portion 71 a cylindrical intermediate tubular portion 72 extending upward; and an upper plate portion 73 extending inward from the upper end edge portion of the intermediate tubular portion 72. The outer tubular portion 70, the lower plate portion 71, the intermediate tubular portion 72, and the upper plate portion 73 are disposed in the storage chamber 40. The diaphragm 33 partitions the storage chamber 40 into a liquid chamber 74 for storing the brake fluid on the lower side of the diaphragm 33, and a gas chamber 75 communicating with the atmosphere above the diaphragm 33. The diaphragm 33 can be deformed to vary the amount of the brake fluid following the liquid chamber 74.

The cover member 26 is an integrally molded product formed by casting, and covers the diaphragm 33 on the upper side. The cover member 26 has a frame-like plate portion 69 on the lower surface thereof and the upper surface of the reservoir wall portion 38 sandwiching the diaphragm 33. In this state, the cover member 26 is fixed to the reservoir wall portion 38 shown in Fig. 4 by the attachment screws 27 and 27 shown in Fig. 1 . In this manner, the diaphragm 33 is directly sandwiched by the reservoir wall portion 38 of the body member 20 and the cover member 26.

The master cylinder 11 for a vehicle has a return spring 76, a piston 77, a cup seal 78, a cup seal 79, and a dust jacket 80. These components are all disposed in the above-described hydraulic cylinder bore 47. The boot 80 is formed by the boot body 81 and the rigid ring 82. The return spring 76, the piston 77 and the rigid ring 82 are made of metal, and the cup seal 78, the cup seal 79 and the boot body 81 are formed of an elastic material such as rubber.

The piston 77 has a cylindrical shaft portion 85, a disk-shaped flange portion 86, a cylindrical shaft portion 87, a disk-shaped flange portion 88, a cylindrical shaft portion 89, and a disk-shaped flange portion. 90, cylindrical shaft portion 91, circular plate The flange portion 92, the cylindrical shaft portion 93, the cylindrical shaft portion 94, and the disk-shaped flange portion 95 are formed in a coaxial shape having a common central axis.

The shaft portion 85 is formed in the piston 77 closest to the side of the cylinder bottom portion 46, 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. The outer diameter of the flange portion 86 is larger than the outer diameter of the shaft portion 85. The shaft portion 87 is disposed on the opposite side with respect to the shaft portion 85 of the flange portion 86. The outer diameter of the shaft portion 87 is smaller than the outer diameter of the shaft portion 85. The flange portion 88 is disposed on the opposite side with respect to the flange portion 86 of the shaft portion 87. The outer diameter of the flange portion 88 is larger than the outer diameter of the flange portion 86.

The shaft portion 89 is disposed on the opposite side with respect to the shaft portion 87 of the flange portion 88. The outer diameter of the shaft portion 89 is smaller than the outer diameter of the flange portion 88. The flange portion 90 is disposed on the opposite side with respect to the flange portion 88 of the shaft portion 89. The outer diameter of the flange portion 90 is equal to the outer diameter of the flange portion 88. The shaft portion 91 is disposed on the opposite side with respect to the shaft portion 89 of the flange portion 90. The outer diameter of the shaft portion 91 is smaller than the outer diameter of the flange portion 90.

The flange portion 92 is disposed on the opposite side with respect to the flange portion 90 of the shaft portion 91. The outer diameter of the flange portion 92 is equal to the outer diameter of the flange portion 90. The shaft portion 93 is disposed on the opposite side with respect to the shaft portion 91 of the flange portion 92. The outer diameter of the shaft portion 93 is smaller than the outer diameter of the flange portion 92. The shaft portion 94 is disposed on the opposite side with respect to the flange portion 92 of the shaft portion 93. The outer diameter of the shaft portion 94 is smaller than the outer diameter of the shaft portion 93.

The flange portion 95 is matched with respect to the shaft portion 93 of the shaft portion 94. Place on the opposite side. The outer diameter of the flange portion 95 is larger than the outer diameter of the shaft portion 94 and is equal to the outer diameter of the shaft portion 93. The flange portion 95 is formed in the piston 77 with respect to the most opposite side of the cylinder bottom portion 46. The piston 77 is slidably fitted to the inner peripheral surface 51a of the main hole portion 51 of the cylinder bore 47 in the flange portions 88, 90, and 92. As a result, the piston 77 is slidably disposed in the hydraulic cylinder 37 and moves in the cylinder axis direction.

The return spring 76 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 77 penetrating the inside thereof.

The cup seal 78 is formed in a C-shape in which one side shape including a cross section of the center axis is opened toward one side in the axial direction. The cup seal 78 is disposed between the flange portions 86 and 88 of the piston 77 and fitted to the shaft portion 87. The cup seal 78 is in a state in which the C-shaped opening side is disposed on the flange portion 86 side, and the outer peripheral portion is slidably attached to the inner peripheral surface 51a of the main hole portion 51.

The cup seal 79 is formed in a C-shape in which one side shape including a cross section of the center axis is opened toward one side in the axial direction. The cup seal 79 is disposed between the flange portions 90 and 92 of the piston 77 and fitted to the shaft portion 91. The cup seal 79 is in a state in which the C-shaped opening side is disposed on the flange portion 90 side, and the outer peripheral portion is slidably attached to the inner peripheral surface 51a of the main hole portion 51.

As shown in Fig. 5, the mounting screw member 30 has a disk-shaped head portion 105; the diameter is smaller than the head portion 105, and extends from the head portion 105. The cylindrical threaded shaft portion 106; the cylindrical front end shaft portion 107 extending from the opposite side with respect to the head portion 105 of the threaded shaft portion 106. The head portion 105 and the threaded shaft portion 106 are coaxial with the front end shaft portion 107. The distal end shaft portion 107 has an outer peripheral surface 107a that is cylindrical in shape, an outer peripheral surface 107b that is reduced in diameter from the end edge portion of the outer peripheral surface 107a on the opposite side of the threaded shaft portion 106, and a flat surface that is orthogonal to the central axis. Front end face 107c. The C-shaped spring washer 32 and the annular locking washer 31 are inserted into the screw member 30 by the front end shaft portion 107 and the screw shaft portion 106, respectively. The locking washer 31 is formed to be locked by the mounting screw member 30, and the removal of the mounting screw member 30 from the spring washer 32 is restricted.

The housing 28 of the brake switch 29 has a main portion 110 and a mounting portion 111 which is thinner than the main portion 110, and is formed on the mounting portion 111 side of the main portion 110 in the up and down direction and in the front and rear direction. Wall portion 112. A through hole 113 penetrating in the thickness direction is formed in the mounting portion 111. The brake switch 29 has its main portion 110 abutted against the main seat portion 55 of the mount 54, the mounting portion 111 abuts against the protruding seat portion 56, and the wall portion 112 abuts against the wall portion 57.

In this state, the front end shaft portion 107 and the screw shaft portion 106 of the mounting screw member 30 in which the "insertion washer 31 and the spring washer 32 are attached in advance" are inserted into the through hole 113 of the brake switch 29, and The threaded shaft portion 106 is locked to the threaded hole of the cylinder portion 45, that is, the radial hole 58. In this way, by inserting and locking the mounting screw member 30 to the radial hole 58, the protruding seat portion 56 of the head portion 105 of the mounting screw member 30 and the cylinder portion 45 is formed, and the spring washer 32 and the card are held. stop The washer 31 and the mounting portion 111 of the brake switch 29 further fix the brake switch 29 to the hydraulic cylinder 37.

The mounting screw member 30 in a state in which the brake switch 29 has been fixed to the hydraulic cylinder 37 is formed such that the front end shaft portion 107 protrudes inward in the radial direction of the cylinder from the flange portion 92 of the piston 77. In the state in which the flange portion 92 of the piston 77 is disposed on the opposite side of the opening 48 from the front end shaft portion 107 of the screw member 30, the brake switch 29 is fixed to the hydraulic cylinder 37. In this case, even if the piston 77 is moved by the return spring 76 shown in Fig. 4 and is to be moved in the "direction of pulling out from the cylinder bore 47", the "mounting screw member 30 can be formed as shown in Fig. 5". It is connected to the flange portion 92" of the piston 77 to restrict the above movement.

In other words, the mounting screw member 30 is inserted into the "radial hole 58 formed in the hydraulic cylinder 37" to restrict the movement of the piston 77 to the hydraulic cylinder 37. Here, the flange portion 92 has a cylindrical outer peripheral surface 92a that is the largest outer diameter portion thereof, and a reduced diameter from the end edge portion of the outer peripheral surface 92a on the side of the shaft portion 93, and extends toward the shaft portion 93 side. The reduced diameter outer peripheral surface 92b; and the end surface 92c extending radially inward from the reduced diameter outer peripheral surface 92b. The end surface 92c is formed in parallel with the "face that is orthogonal to the cylinder axis". The threaded member 30 is attached to the reduced diameter outer peripheral surface 92b of the flange portion 92 by the reduced diameter outer peripheral surface 107b whose "front end shaft portion 107 is inclined". In this case, the cylindrical outer peripheral surface 107a of the distal end shaft portion 107 can be brought into contact with the end surface 92c of the flange portion 92 by lengthening the "length of the distal end shaft portion 107".

When the brake lever 23 is not operated, the brake switch 29 is pressed by the brake lever 23 to be in an OFF state, and once the brake is pulled When the lever 23 is operated to separate the brake lever 23, it is in an ON state, thereby detecting the operation of the brake lever 23.

The boot body 81 of the boot 80 is formed in a tubular shape, and has a fitting portion 115 at one end, a flexible portion 116 in the middle, and a fitting portion 117 at the other end. The fitting portion 115 and the fitting portion 117 are formed in a ring shape. The flexible portion 116 is formed in a tubular shape having a radial thickness thinner than the fitting portion 115 and the fitting portion 117, and has flexibility. A mounting groove 118 is formed on the radially inner side of the fitting portion 117 of the boot body 81, and a rigid ring 82 is attached to the mounting groove 118.

In the boot 80, the fitting portion 115 of one end of the boot body 81 is disposed between the shaft portion 93 of the piston 77 and the flange portion 95, and is fitted to the shaft portion 94. Further, the boot 80 is formed in a state in which the flexible portion 116 extending from the outer peripheral side of the fitting portion 115 extends toward the opposite side with respect to the flange portion 92, and then is folded back on the outer side in the radial direction of the cylinder, and is formed in the inlet and outlet holes. The inner portion of the flange 53 extends toward the side of the flange portion 92. In addition, the dust jacket 80 is in contact with the inner circumferential surface 53a of the inlet/outlet hole portion 53 in a state where the fitting portion 117 at the other end is prevented from deforming in the radial direction of the cylinder by the rigid ring 82. As a result, the boot 80 of one end of the boot 80 is held by the piston 77 and covers the opening 48 side of the hydraulic cylinder 37 to form a protection.

In the case where the return spring 76 and the piston 77 and the cup seals 78, 79 and the boot 80 shown in Fig. 4 are assembled toward the cylinder bore 47, the cup seals 78, 79 and the boot 80 are assembled in advance. Piston 77. In other words, the cup seal 78 is fitted to the groove portion formed by the "flange portion 86 of the piston 77, the shaft portion 87, and the flange portion 88". Also make The cup seal 79 is fitted to a groove portion formed by the "flange portion 90 of the piston 77, the shaft portion 91, and the flange portion 92". Further, the dust jacket 80 in a state in which the "rigid ring 82 has been previously attached to the boot body 81" is attached to the piston 77. In this case, as shown in FIG. 5, the fitting portion 115 is fitted to the groove portion formed by the "shaft portion 93 of the piston 77, the shaft portion 94, and the flange portion 95" to be flexible. The fitting portion 116 extends from the fitting portion 115 to the opposite side with respect to the flange portion 92, and then is folded back on the outer side in the radial direction of the cylinder to extend toward the flange portion 92 side.

Then, the return spring 76 shown in Fig. 4 is inserted into the cylinder bore 47, and the piston 77 in the above state is inserted into the cylinder bore 47. At this time, the boot 80 is formed such that the fitting portion 117 shown in FIG. 5 is fitted into the inlet and outlet hole portion 53 of the cylinder bore 47. However, the fitting portion 117 is formed on the opposite end surface 117a of the fitting portion 115 so as to be located closer to the opening portion 48 than the radial hole 58. In this state, the brake switch 29 is disposed in the mount 54, and in order to compress the return spring 76, the piston 77 is pressed in a predetermined amount so that the flange portion 92 is located on the opposite side of the opening 48 from the radial hole 58. In the state, the threaded shaft portion 106 of the mounting screw member 30 is locked to the radial hole 58.

Thereby, the screw member 30 is attached to fix the brake switch 29 to the hydraulic cylinder 37. With the above-described operation, the mounting screw member 30 is formed such that the front end surface 107c of the front end shaft portion 107 is located further inside the cylinder radial direction than the outer peripheral surface 92b of the flange portion 92. As a result, the screw member 30 is brought into contact with the flange portion 92 of the piston 77 to restrict the movement of the piston 77 toward the "direction of pulling out from the cylinder bore 47". In this state, The piston 77 provided in the hydraulic cylinder 37 is formed to be movable in the opposite direction with respect to the opening 48 in the direction of the cylinder axis from the "position where the threaded member 30 is restrained from moving".

After that, the fitting portion 117 of the boot 80 is pressed into a predetermined position by the jig. As a result, in the boot 80, the fitting portion 115 at one end is held by the piston 77, and the fitting portion 117 at the other end abuts against the inner peripheral surface 53a of the inlet and outlet hole portion 53 over the entire circumference to form a covering hydraulic pressure. The state of the opening 37 side of the cylinder 37. The piston 77 abuts the flange portion 92 at a position where the screw member 30 is attached, and becomes a standby position in a state where the brake lever 23 is not operated.

In the cylinder bore 47, the cup seal 79 of the piston 77 is further filled with the brake fluid on the side of the cylinder bottom portion 46 shown in FIG. 4, the cup seal 78 and the piston 77, the cylinder portion 45, The bottom 46 of the hydraulic cylinder forms a "hydraulic chamber 120 that communicates with a brake cylinder not shown in the drawing."

A pressing portion 125 of the brake lever 23 is disposed on the opposite side of the flange portion 95 of the piston 77 with respect to the cylinder bottom portion 46. Once the brake lever 23 is operated, the pressing portion 125 is formed toward the cylinder bottom 46 side, that is, toward the left side, and the piston 77 is pressed in this direction. In this case, "the piston 77 and the cup seal 78 are integrally moved in the direction of reducing the hydraulic pressure chamber 120", and once the cup seal 78 passes over the second communication hole (not shown), the hydraulic chamber 120 and the storage chamber 40 are blocked. In the communication between the two, the brake fluid is supplied from the hydraulic chamber 120 to the brake cylinder omitted from the drawing.

In other words, the master cylinder 11 for the vehicle generates the brake fluid by advancing the piston 77 toward the bottom 46 of the cylinder by the operation of the brake lever 23. Pressure. At this time, the cup seal 78 and the cup seal 79 communicate with the storage chamber 40 via the first communication hole 62. Further, once the operation of the brake lever 23 is released, the piston 77 is returned (reset) by the spring force of the return spring 76, and the brake fluid of the brake cylinder (not shown) is returned to the hydraulic chamber 120. Here, once the amount of brake friction material of the brake device is reduced, the volume of the hydraulic chamber on the brake cylinder side is increased. In the master cylinder 11 for a vehicle, when the brake lever 23 is not in the operating state, since the hydraulic chamber 120 communicates with the storage chamber 40 via the second communication hole, which is not shown, the brake fluid of the portion (parts) is supplied from the storage chamber 40. Replenishment to the hydraulic chamber 120.

The liquid storage cylinder wall portion 38 and the liquid reservoir bottom portion 39 of the main body member 20, the cover member 26, the diaphragm 33, and the mounting screws 27, 27 are provided at the upper portion of the hydraulic cylinder 37 to constitute a liquid storage for the brake fluid storage. Cartridge 10. According to this, the liquid storage cylinder 10 is integrally connected to the "mains pump main pump 11 for supplying the brake fluid to the ramming car sub-pump".

In the master cylinder described in Patent Document 1, the covering member that covers the opening of the hydraulic cylinder is attached to the hydraulic cylinder by the locking member that is locked to the opening of the hydraulic cylinder, and the piston is restricted by the covering member. Pull out. Therefore, the locking member is an essential member, and the "locking groove in which the locking member can be locked" must be formed on the inner circumferential surface of the opening of the hydraulic cylinder. For this reason, the manufacture of the cutting process of the locking groove and the insertion of the locking member becomes complicated, and it is time consuming to manufacture. In addition, as the number of parts increases, the cost of parts and assembly costs increase, and the processing cost for forming the locking grooves is greatly increased.

In contrast, the above-described master cylinder 11 for a vehicle is in a hydraulic cylinder. 37 forms a "radial hole 58 that opens into the cylinder bore 47". Further, a mounting screw member 30 for fixing the "brake switch 29 for detecting the operation of the brake lever 23" to the hydraulic cylinder 37 is inserted through the radial hole 58. Then, by attaching the screw member 30, the movement of the piston 77 toward the "direction of pulling out from the hydraulic cylinder 37" is restricted. In this manner, the mounting screw member 30 that "fixes the brake switch 29 to the hydraulic cylinder 37" restricts the movement of the piston 77 in the pulling-out direction, thereby stopping the piston 77 at the standby position, thereby suppressing an increase in the number of components. Therefore, the manufacturing efficiency of the master cylinder for the vehicle can be improved. In addition, an increase in component cost and assembly cost can be suppressed. In addition, the radial hole 58 necessary for mounting the screw member 30 can be formed to have a depth toward the opening in the cylinder bore 47, thereby suppressing man-hour processing and machining accuracy management. The increase in working hours and processing costs.

"Second embodiment"

Next, the second embodiment will be described mainly with reference to Fig. 6 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 vehicle master cylinder 11A of the second embodiment, the mounting screw member 30A having a different partial structure is used with respect to the mounting screw member 30 (see FIG. 5) of the first embodiment. Specifically, the mounting screw member 30A does not have the distal end shaft portion 107 of the first embodiment, and has a threaded shaft portion 106A that is partially different from the threaded shaft portion 106 of the first embodiment. The threaded shaft portion 106A is formed at a front end portion on the opposite side of the head portion 105 such that the diameter becomes smaller toward the front end side (that is, the diameter is reduced). The reduced diameter outer peripheral surface 106Aa and the front end surface 106Ab that is orthogonal to the central axis of the screw shaft portion 106A. In the second embodiment, the metal piston abutting member 130A (circumferential member) that is disposed in the cylinder bore 47 of the hydraulic cylinder 37 and abuts against the flange portion 92 of the piston 77 is provided. The piston abutting member 130A is formed, for example, by a cutting process.

The piston abutting member 130A is formed in an annular shape. The piston abutting member 130A has a cylindrical surface shape on its inner circumferential surface 130Aa, and a cylindrical surface shape on the outer circumferential surface 130Ab. The piston abutting member 130A has an end surface 130Ac and an end surface 130Ad on both sides in the axial direction to form a flat surface parallel to the axially orthogonal surface. The piston abutting member 130A is inserted into the inlet and outlet hole portion 53, and the inner side thereof is penetrated by the shaft portion 93 of the piston 77. In this state, the piston abutting member 130A has an annular shape extending in the circumferential direction of the cylinder. The piston abutting member 130A has a minimum diameter of the end faces 130Ac, 130Ad which is smaller than a maximum diameter of the end face 92c of the flange portion 92 of the piston 77.

In the second embodiment, when the cup seal 78 (please refer to FIG. 4), the cup seal 79, and the boot 80 are assembled to the piston 77 in advance, the piston abutting member 130A is also assembled in advance. That is, the shaft portions 93 and 94 and the flange portion 95 are inserted into the inside of the piston abutting member 130A, and the piston abutting member 130A is attached to the piston 77. After that, the fitting portion 115 of the boot 80 in a state in which the rigid ring 82 has been attached to the boot body 81 in advance is fitted to the shaft portion 93, the shaft portion 94, and the flange portion 95 of the piston 77. The groove portion formed.

Then, it is formed that "the flexible portion 116 is extended from the fitting portion 115 toward the opposite side with respect to the flange portion 92, and then folded outward in the radial direction of the cylinder. In the state of being extended toward the flange portion 92, the piston abutting member 130A is held between the fitting portion 117 and the flange portion 92. At this time, the end surface 130Ac of one side of the piston abutting member 130A abuts against the end surface 92c of the flange portion 92, and the other end surface 130Ad abuts against the opposite side of the fitting portion 117 with respect to the fitting portion 115. Side end face 117a. In this way, the piston abutting member 130A is temporarily assembled to the piston 77.

Then, the return spring 76 (please refer to FIG. 4) is inserted into the cylinder bore 47, and the cup seal 78 (refer to FIG. 4), the cup seal 79, the boot 80, and the piston abutment member are pre-assembled. The piston 77 of 130A is inserted into the cylinder bore 47. Next, a fitting amount of press-fitting is applied to the fitting portion 117 of the piston 77 and the boot 80 by the jig, and the above-described two members are positioned in the inlet/outlet hole portion 53 in the cylinder axis direction.

At this time, the boundary portion between the end surface 130Ac of the piston abutting member 130A and the outer peripheral surface 130Ab may be brought into contact with the reduced-diameter inner peripheral surface 53b of the inlet and outlet hole portion 53 to form a positioning. Further, at the boundary between the end surface 130Ac of the piston abutting member 130A and the outer peripheral surface 130Ab, a reduced-diameter outer peripheral surface having a smaller diameter toward the end surface 130Ac side may be formed, and the reduced-diameter outer peripheral surface may be brought into contact with the inlet and outlet holes. The reduced diameter inner peripheral surface 53b of 53 forms a positioning. In addition, the contact of the reduced diameter inner peripheral surface 53b of the inlet and outlet hole portion 53 is avoided at the outer peripheral surface of the reduced diameter, and the end surface 130Ac is brought into contact with the bottom surface 53c of the inlet and outlet hole portion 53 to form a positioning.

In a state where the piston 77 and the piston abutting member 130A are positioned in the inlet and outlet hole portion 53 in the cylinder axis direction, the brake switch 29 is disposed on the mount 54, and the threaded shaft portion of the screw member 30A is attached. The 106A is locked to the radial bore 58. Thereby, the screw member 30 is attached to fix the brake switch 29 to the hydraulic cylinder 37. With the above-described operation, the screw member 30A is attached, and the front end surface 106Ab of the screw shaft portion 106A abuts against the outer peripheral surface 130Ab of the piston abutting member 130A, and the other portion of the outer peripheral surface 130Ab is crimped to the inner circumference of the inlet and outlet hole portion 53. Face 53a. As a result, the piston abutting member 130A is fixed to the hydraulic cylinder 37.

In this way, the piston abutting member 130A fixed to the hydraulic cylinder 37 by the mounting screw member 30A is brought into contact with the end surface 130Ac over the entire circumference of the flange portion 92, and is in the following state: the restriction piston 77 The movement toward the "direction of pulling out from the cylinder bore 47". The piston 77 abuts the flange portion 92 at a position where the piston abutting member 130A abuts, and becomes a standby position in a state where the brake lever 23 is not operated.

Here, the piston abutting member 130A may be a member that extends in the circumferential direction of the hydraulic cylinder 37, and may be a non-annular shape. For example, a C-shaped member that cuts a part of the ring may be used.

According to the second embodiment described above, the attachment screw member 30A is disposed in the hydraulic cylinder 37 and transmits the piston abutting member 130A that abuts against the piston 77 to restrict the movement of the piston 77. Therefore, the "area that abuts against the piston 77 when the movement is restricted" can be easily increased as compared with the case where "the movement is restricted by the direct attachment of the mounting screw member 30". In other words, since the piston abutting member 130A has a shape extending in the circumferential direction of the hydraulic cylinder 37, it is possible to increase the "area that abuts against the piston 77 when the movement is restricted". As a result, the damage of the piston 77 can be suppressed.

"Third embodiment"

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

In the vehicle master cylinder 11B of the third embodiment, the body member 20B having a partial structure is different from the body member 20 of the first and second embodiments (see FIGS. 5 and 6). In the main body member 20B, a radial hole 58B in which the position in the cylinder axis direction is displaced toward the opening 48 side is formed with respect to the radial hole 58 of the first and second embodiments. Thereby, the hydraulic cylinder 37, the cylinder portion 45, the cylinder bore 47, the mount 54, the protruding seat portion 56, the inlet and outlet hole portion 53, and the inner peripheral surface 53a of the first and second embodiments are the body member 20B. The hydraulic cylinder 37B having the "radial hole 58B different in position from the radial hole 58", the cylinder portion 45B, the cylinder bore 47B, the mounting seat 54B, the protruding seat portion 56B, the inlet and outlet hole portion 53B, and the inner circumference Face 53Ba.

In the third embodiment, in accordance with the above description, the brake switch 29B having a different partial structure is used with respect to the brake switch 29 of the first and second embodiments (please refer to FIGS. 5 and 6). In other words, the brake switch 29B is formed with a through hole 113B that is offset from the through hole 113 of the first and second embodiments. In the brake switch 29B, the housing 28B and the mounting portion that are "the through hole 113B that is different in position from the through hole 113" are formed in the housing 28 and the mounting portion 111 of the first and second embodiments. 111B.

In the third embodiment, the mounting screw member 30B having a different partial structure is used with respect to the mounting screw member 30A (see Fig. 6) of the second embodiment. Specifically, the mounting screw member 30B is formed with a threaded shaft portion 106B having a length slightly longer than that of the screw shaft portion 106A of the second embodiment. The threaded shaft portion 106B has a reduced diameter outer peripheral surface 106Ba having a length longer than that of the reduced diameter outer peripheral surface 106Aa of the second embodiment, and a front end surface 106Bb having a smaller diameter than the front end surface 106Ab of the second embodiment.

In the third embodiment, the piston abutting member 130B having a different partial structure is used with respect to the piston abutting member 130A (see Fig. 6) of the second embodiment. Specifically, in the piston abutting member 130A of the second embodiment, the thickness of the piston abutting member 130B in the axial direction is reduced, and the outer peripheral portion on the axial direction side is formed to have a "diameter toward the shaft. The inclined portion 131B of the inclined surface 130Be" whose direction of the front end side is smaller. According to the above description, the piston abutting member 130B has an inner circumferential surface 130Ba and an outer circumferential surface 130Bb which are narrower than the inner circumferential surface 130Aa and the outer circumferential surface 130Ab of the second embodiment; and the end surface of the first embodiment The same end surface 130Bc of 130Ac; and an end surface 130Bd having a narrower radial width than the end surface 130Ad of the first embodiment. The piston abutting member 130B has a minimum diameter of at least the end surface 130Bc which is smaller than a maximum diameter of the end surface 92c of the flange portion 92 of the piston 77.

In the third embodiment, as in the second embodiment, the cup seal 78 (please refer to FIG. 4), the cup seal 79, the boot 80, and the piston abutting member 130B are assembled to the piston 77 in advance. At this time, the piston abutting member 130B is oriented such that the inclined surface 130Be and the end surface 130Bd are oriented The piston 77 is assembled on the opposite side of the flange portion 92.

Then, the return spring 76 (please refer to FIG. 4) is inserted into the cylinder bore 47B, and the cup seal 78 (refer to FIG. 4), the cup seal 79, the boot 80, and the piston abutting member are pre-assembled. The piston 77 of 130B is inserted into the cylinder bore 47B. Next, the fitting portion 117 of the piston 77 and the boot 80 is pressed by a predetermined amount by the jig, and the piston abutting member 130B is positioned at a predetermined position on the opposite side of the opening 48 of the radial hole 58B.

At this time, the boundary corner portion between the end surface 130Bc of the piston abutting member 130B and the outer peripheral surface 130Bb may be brought into contact with the reduced-diameter inner peripheral surface 53b of the inlet/outlet hole portion 53B to form a positioning. In addition, a reduced-diameter outer peripheral surface having a smaller diameter toward the end surface 130Bc side may be formed at a boundary between the end surface 130Bc of the piston abutting member 130B and the outer peripheral surface 130Bb, and the reduced-diameter outer peripheral surface may be brought into contact with the inlet and outlet holes. The diameter of the inner peripheral surface 53b of the 53B is reduced to form a positioning. In addition, the contact of the reduced diameter inner peripheral surface 53b of the inlet and outlet hole portion 53B is avoided at the outer peripheral surface of the reduced diameter, and the end surface 130Bc is brought into contact with the bottom surface 53c of the inlet and outlet hole portion 53B to form a positioning.

In a state where the piston 77 and the piston abutting member 130B are positioned in the inlet/outlet hole portion 53B in the cylinder axis direction, the brake switch 29B is disposed in the mount 54B, and the screw shaft portion 106B of the screw member 30B is fitted. The brake switch 29B is fixed to the hydraulic cylinder 37B in the radial hole 58B.

Once this, the reduced diameter outer peripheral surface 106Ba of the mounting screw member 30B will be inclined with respect to the inclined portion 131B of the piston abutment member 130B. The surface 130Be is superposed on the radial direction of the cylinder to form a state adjacent to the opening 48 side of the cylinder axis direction. As a result, the screw member 30B is attached, and the reduced-diameter outer peripheral surface 106Ba abuts against the inclined surface 130Be of the piston abutting member 130B, thereby restricting the piston abutting member 130B from further toward "the direction of pulling out from the hydraulic cylinder 37B". mobile.

Then, as described above, the piston abutting member 130B in a state in which "the movement in the direction in which the direction is pulled out from the hydraulic cylinder 37B has been restricted by the mounting screw member 30B" has been exhibited, and the end surface 92c of the flange portion 92 is spread over the entire surface. The circumferential end abuts against the end surface 130Bc, and a state of "moving the direction in which the piston 77 is pulled out toward the cylinder bore 47B" is formed. The piston 77 abuts against the position of the piston abutting member 130B that "contacts the threaded member 30B" and is in a standby position in a state where the brake lever 23 is not operated. When the screw shaft portion 106B of the mounting screw member 30B is locked to the radial hole 58B, the reduced diameter outer peripheral surface 106Ba of the mounting screw member 30B presses the fitting portion 117 of the boot 80 against the opening portion 48 side to form a movement.

Here, when the brake switch 29B is fixed, the inclined surface 130Be of the inclined portion 131B of the piston abutting member 130B can be pressed by the reduced diameter outer peripheral surface 106Ba of the screw member 30B. Then, by pressing, the boundary corner between the end surface 130Bc of the piston abutting member 130B and the outer peripheral surface 130Bb is pressed against the reduced-diameter inner peripheral surface 53b of the inlet and outlet hole portion 53B, and the outer peripheral surface 130Bb is pressed. It is connected to the inner peripheral surface 53Ba of the inlet and outlet hole portion 53B. Thus, when the mounting screw member 30B fixes the brake switch 29B to the hydraulic cylinder 37B, the piston abutting member 130B is also positioned to be fixed to the hydraulic cylinder 37B so as not to be movable.

In this case, a reduced-diameter outer peripheral surface having a smaller diameter toward the end surface 130Bc side may be formed on the boundary between the end surface 130Bc of the piston abutting member 130B and the outer peripheral surface 130Bb, and the reduced-diameter outer peripheral surface may be abutted. The reduced diameter inner peripheral surface 53b of the inlet and outlet hole portion 53B is formed to be positioned. In addition, the contact of the reduced diameter inner peripheral surface 53b of the inlet and outlet hole portion 53B is avoided at the outer peripheral surface of the reduced diameter, and the end surface 130Bc is brought into contact with the bottom surface 53c of the inlet and outlet hole portion 53B to form a positioning.

Here, the same applies to the piston abutting member 130B, and any member that extends in the circumferential direction of the hydraulic cylinder 37B may be a non-annular shape, and may be, for example, a C-shaped portion that cuts a part of the ring. Type member.

According to the third embodiment described above, the piston abutting member 130B extends in the cylinder circumferential direction, wherein one end side abuts against the piston 77, and a portion abutting the mounting screw member 30B is formed with "having the other end An inclined portion 131B of the inclined surface 130Be" extending laterally and radially inward. According to this, the mounting screw member 30B overlaps the piston abutting member 130B in the radial direction of the hydraulic cylinder. Therefore, even if a certain amount of slack is generated at the mounting screw member 30B, it is possible to suppress the piston abutting member 130B from moving over the mounting screw member 30B.

Further, since the piston abutting member 130B has the inclined portion 131B, even if the hydraulic cylinder is superposed on the mounting screw member 30B in the radial direction, the "length overlapping in the cylinder axis direction" can be increased. According to this, it is possible to suppress the increase in the axial direction of the hydraulic cylinder 37B (the finger becomes larger and longer). In addition to this, the movement of the cylinder axis direction can be suppressed to position the piston abutting member 130B.

"Fourth embodiment"

Next, the fourth embodiment will mainly be described with reference to Fig. 8 and differences from the first to third embodiments. The parts common to the first to third embodiments are denoted by the same reference numerals and the same reference numerals.

In the vehicle master cylinder 11C of the fourth embodiment, the main body member 20B, the brake switch 29B, and the mounting screw member 30B which are the same as those of the third embodiment are used.

In the fourth embodiment, the dust jacket 80C having a partial structure different from that of the dust jacket 80 of the first to third embodiments (see FIGS. 5 to 7) is used. The boot 80C has a boot body 81C (flexible protective member) which is partially different from the boot body 81 of the first to third embodiments. Similarly to the boot body 81, the boot body 81C is a member that covers the opening 48 side of the hydraulic cylinder 37B and is protected, and has a flexible portion that is longer than the flexible portion 116 of the first to third embodiments. 116C; and a fitting portion 117C different from the fitting portion 117 of the first to third embodiments. The fitting portion 117C has annular outer protruding portions 151C and 152C that are arranged in the axial direction and protrude outward in the radial direction, and a position in the axial direction and an outer protruding portion on the opposite side of the flexible portion 116. 151C" is a ring-shaped inner protruding portion 153C that is fitted to the inner side in the radial direction. Next, the boot 80C has a piston abutting member 130C attachable to the fitting portion 117C.

The piston abutting member 130C is formed by bending a metal plate. The working chamber is formed into an annular shape having an inner tubular portion 161C, a curved tubular portion 162C, an end plate portion 163C, a curved tubular portion 164C, an outer tubular portion 165C, and a tapered tubular portion 166C (inclined portion). The inner tubular portion 161C is formed in a cylindrical shape. The curved tubular portion 162C is curved and extended in such a manner that the diameter increases from the end edge portion on the one side in the axial direction of the inner tubular portion 161C toward the outer side. The end plate portion 163C protrudes outward in the radial direction from the end edge portion on the large diameter side of the curved tubular portion 162C, and is formed in a flat plate shape parallel to the "surface orthogonal to the central axis of the inner cylindrical portion 161C". The curved plate portion 164C is bent and extended in such a manner that the outer circumferential portion of the end plate portion 163C faces the same side as the inner cylindrical portion 161C in the axial direction as it goes outward. The outer tubular portion 165C is formed in a cylindrical shape and extends from the opposite end edge portion toward the "direction separated from the end plate portion 163C" with respect to the end plate portion 163C of the curved plate portion 164C. The tapered tubular portion 166C extends from the opposite end edge portion toward the "direction separated from the end plate portion 163C" with respect to the curved tubular portion 164C of the outer tubular portion 165C, and the smaller the diameter toward the distal end side of the extension.

In the piston abutting member 130C, an annular shape is formed inside the inner tubular portion 161C, the curved tubular portion 162C, the end plate portion 163C, the curved tubular portion 164C, the outer tubular portion 165C, and the tapered tubular portion 166C. Closure 167C. The fitting groove 167C opens outward between the inner cylindrical portion 161C and the tapered tubular portion 166C.

Next, the fitting portion 117C of the boot body 81C is fitted into the fitting groove 167C through the opening between the inner tubular portion 161C and the tapered tubular portion 166C. At this time, the fitting portion 117C causes the inner protruding portion 153C to abut against the inner cylindrical portion 161C and the curved tubular portion 162C, and the outer protruding portion 151C. The outer tubular portion 152C and the outer cylindrical portion 165C are brought into contact with the outer tubular portion 165C and the tapered tubular portion 166C. In this manner, the piston abutting member 130C is held by the fitting portion 117C at the other end of the boot body 81C in which the fitting portion 115 on one side is held by the piston 77. The piston abutting member 130C is formed to be inserted into the inlet and outlet hole portion 53B, and the piston 77 is inserted through the inner side of the inner cylindrical portion 161C. In this state, the piston abutting member 130C has an annular shape extending in the circumferential direction of the cylinder.

The inner circumferential surface 161Ca of the inner tubular portion 161C is formed in a cylindrical shape, and the outer circumferential surface 165Ca of the outer tubular portion 165C is also formed in a cylindrical shape. An end surface 163Ca on the outer peripheral side in the axial direction of the one end plate portion 163C in the axial direction forms a flat surface parallel to the axial orthogonal surface. The tapered outer diameter surface 166C is formed on the outer side in the radial direction of the tapered cylindrical portion 166C so as to be smaller in diameter from the end surface 163Ca (so-called reduced diameter) and has a tapered outer diameter surface 166Ca extending inward in the radial direction. The inner circumferential surface 161Ca, the end surface 163Ca, the outer circumferential surface 165Ca, and the reduced diameter outer circumferential surface 166Ca are formed coaxially. The piston abutting member 130C has a minimum diameter of at least the end surface 163Ca which is smaller than a maximum diameter of the end surface 92c of the flange portion 92 of the piston 77.

In the fourth embodiment, as in the second embodiment, the cup seal 78 (please refer to FIG. 4), the cup seal 79, and the boot 80C are assembled to the piston 77 in advance. At this time, in the boot 80C, the piston abutting member 130C and the boot body 81C are formed in an individual state, and the piston abutting member 130C is used as the tip end, and the tapered tubular portion 166C is directed to the opposite side of the flange portion 92, and The shaft portions 93 and 94 and the flange portion 95 of the piston 77 are inserted into the inner side thereof and disposed on the piston 77. After that, make the dust cover The fitting portion 115 of the body 81C is fitted to the groove portion "formed by the shaft portion 93 of the piston 77, the shaft portion 94, and the flange portion 95".

Then, the state in which the flexible portion 116 is extended from the fitting portion 115 to the opposite side with respect to the flange portion 92 and then folded outward in the radial direction of the cylinder to extend toward the flange portion 92 is formed, and the fitting portion 117C is formed. The fitting is fitted to the fitting groove 167C of the piston abutting member 130C that is attached in advance.

Then, the return spring 76 (refer to FIG. 4) is inserted into the cylinder bore 47B, and the "cup seal 78 (please refer to FIG. 4), the cup seal 79, and the piston abutment member 130C are assembled in advance. The piston 77 of the boot 80C" is inserted into the cylinder bore 47B. The piston 77 and the piston abutting member 130C are pressed by a predetermined amount by the jig, and the piston abutting member 130C is positioned at a predetermined position on the opposite side of the opening 48 of the radial hole 58B. At this time, the end surface 163Ca of the piston abutting member 130C may be brought into contact with the bottom surface 53c of the inlet and outlet hole portion 53B to form a positioning.

In a state where the piston abutting member 130C is positioned in the inlet and outlet hole portion 53B in the cylinder axis direction, the brake switch 29B is placed on the mount 54B, and the screw shaft portion 106B of the mounting screw member 30B is locked in the radial direction. The hole 58B is fixed to the hydraulic cylinder 37B.

In this case, the reduced-diameter outer circumferential surface 106Ba of the mounting screw member 30B is superposed on the reduced-diameter outer circumferential surface 166Ca of the tapered cylindrical portion 166C of the piston abutting member 130C at a position in the radial direction of the cylinder to form a direction adjacent to the cylinder axis. The state on the side of the opening portion 48. Thereby, the screw member 30B is attached, and the reduced diameter outer peripheral surface 106Ba abuts against the reduced diameter outer peripheral surface 166Ca of the tapered cylindrical portion 166C of the piston abutting member 130C, thereby forming a restriction. The piston abutting member 130C is further moved toward the "direction of pulling out from the hydraulic cylinder 37B".

Then, as described above, the piston abutting member 130C in a state in which the movement of the mounting screw member 30B is restricted from the direction in which the cylinder 37B is pulled out is exhibited, and the end surface 92c of the flange portion 92 is covered. The end surface 163Ca is in contact with the end surface 163Ca to form a state of "moving the direction in which the piston 77 is pulled out toward the cylinder bore 47B". The piston 77 abuts against the position of the piston abutting member 130C that "contacts the threaded member 30B" and is in a standby position in a state where the brake lever 23 is not operated.

Here, when the brake switch 29B is fixed, the reduced-diameter outer peripheral surface 166Ca of the tapered tubular portion 166C of the piston abutting member 130C can be pressed by the reduced-diameter outer peripheral surface 106Ba of the screw member 30B. Then, the end surface 163Ca of the piston abutting member 130C is pressed against the bottom surface 53c of the inlet and outlet hole portion 53B by the pressing, and the outer circumferential surface 165Ca is pressed against the inner circumferential surface 53Ba of the inlet and outlet hole portion 53B. Thus, when the mounting screw member 30B fixes the brake switch 29B to the hydraulic cylinder 37B, the piston abutting member 130C is also positioned to be fixed to the hydraulic cylinder 37B so as not to be movable.

Here, the same applies to the piston abutting member 130C, and any member that extends in the circumferential direction of the hydraulic cylinder 37B may be a non-annular shape, and may be, for example, a C-shaped portion that cuts a part of the ring. Type member. Further, the piston abutting member 130C may be provided with a portion that "expands and extends from the tapered tubular portion 166C in the opposite direction to the end plate portion 163C", and the end portion of the inner side of the hydraulic cylinder of the boot body is fitted to the end portion. Part of the outer peripheral side.

According to the fourth embodiment described above, the piston abutting member 130C is held on the other side of the boot body 81C on the side of the opening 48 of the hydraulic cylinder 37B. Therefore, the other side of the boot body 81C can be attached to the hydraulic cylinder 37B by attaching the piston abutting member 130C to the hydraulic cylinder 37B by the mounting screw member 30B. Thereby, the opening portion 48 side of the hydraulic cylinder 37B can be favorably protected by the boot body 81C. Further, since the rigid piston abutment member 130C can maintain the shape of the other side of the boot body 81C, a rigid ring is not required.

In the above embodiment, in the master cylinder for a vehicle having "a piston propelled by operation of an operating element" and "a hydraulic cylinder in which the piston is provided as a movable cylinder", the hydraulic cylinder is provided with "through" a radial restricting member of the hydraulic cylinder, and a movement restricting member that restricts movement of the piston to the hydraulic cylinder. The movement restricting member fixes the "detecting member that detects the operation of the operating member" to the hydraulic cylinder. In this way, since the movement of the piston is restricted by the movement restricting member that fixes the detecting member to the hydraulic cylinder, the increase in the number of parts can be suppressed. Therefore, the manufacturing efficiency of the master cylinder for the vehicle can be improved. In addition, an increase in component cost and assembly cost can be suppressed. In addition, since the "radial hole necessary for mounting the movement restricting member" is used, the processing cost can also be increased.

The movement restricting member is disposed in the hydraulic cylinder and transmits a piston abutting member that abuts against the piston to restrict movement of the piston. Therefore, compared with the case where "the movement is restricted by the movement restricting member to restrict the movement", it is possible to easily increase the "response to the live when the movement is restricted". The area of the part of the plug." In this way, the damage of the piston can be suppressed, and the reliability as a product can be improved.

The piston abutting member is a circumferential member (which may be annular or C-shaped) extending in the circumferential direction of the cylinder, and one end side abuts against the piston and abuts against the movement restricting member. An inclined portion that extends toward the other end side and that extends inward in the radial direction is formed. As a result, even if the movement restricting member is slightly displaced in the pulling direction at the radial hole, it is possible to suppress the piston abutting member from moving beyond the movement restricting member.

The piston abutting member described above holds the other side of the "flexible protective member that is held by the piston on one side and covers the opening side of the hydraulic cylinder". Therefore, by attaching the piston abutting member to the hydraulic cylinder by the movement restricting member, the other side of the flexible protective member can be attached to the hydraulic cylinder. According to this, the opening portion side of the hydraulic cylinder can be favorably protected by the flexible protective member.

Claims (3)

A master cylinder for a vehicle, which is a piston that is propelled by operation of an operating element; and a master cylinder for a vehicle in which the piston is provided as a movable hydraulic cylinder, characterized in that: the hydraulic cylinder is provided with: a radial hole of the hydraulic cylinder for restricting movement of the hydraulic cylinder by the piston, the movement restricting member fixing the detecting member for detecting the operation of the operating member to the hydraulic cylinder, the movement restriction The member is disposed in the hydraulic cylinder and transmits a piston abutting member that abuts against the piston to restrict movement of the piston. The master cylinder for a vehicle according to the first aspect of the invention, wherein the piston abutting member is a circumferential member extending in a circumferential direction of the cylinder, wherein one end side abuts against the piston and is restricted by the movement The portion pressed by the member is formed with an inclined portion that extends toward the other end side and that extends inward in the radial direction. The master cylinder for a vehicle according to the first or second aspect of the invention, wherein the piston abutting member holds a flexible protective member that is held by the piston on one side and covers an opening side of the hydraulic cylinder. The other side.