JPWO2015166736A1 - Master cylinder for vehicles - Google Patents

Abstract

The vehicular master cylinder has a piston (77) propelled by operation of the operating element (23) and a cylinder (37) in which the piston (77) is movably provided. 37), a movement restricting member (30) is provided which is inserted into the radial hole (58) formed in 37) and restricts the movement of the piston (77) with respect to the cylinder (37). The detection member (29) for detecting the operation of (23) is fixed to the cylinder (37).

Description

The present invention relates to a vehicular master cylinder.
This application claims priority based on Japanese Patent Application No. 2014-093101 for which it applied on April 28, 2014, and uses the content here.

  There is a master cylinder having a structure in which a covering member that covers the opening side of the cylinder is attached to the cylinder by a locking member that is locked to the opening of the cylinder, and piston disengagement is regulated through this covering member (for example, Patent Document 1). reference).

Japanese National Utility Model Publication No. 58-54362

  In the above master cylinder, it takes time to manufacture.

  An aspect of the present invention provides a vehicular master cylinder capable of improving manufacturing efficiency.

  According to the first aspect of the present invention, the vehicle master cylinder is provided with a movement restricting member that is inserted into a radial hole formed in the cylinder and restricts the movement of the piston with respect to the cylinder. The movement restricting member is configured to fix the detection member that detects the operation of the operation element to the cylinder.

  According to the second aspect of the present invention, the cylinder is provided integrally with the cylinder main body member together with the support portion to which the operation element is attached and the reservoir in which the brake fluid is stored. It is a screw member which fixes a detection member to the cylinder body member.

  According to the 3rd aspect of this invention, the said screw member is arrange | positioned so that the front end side can contact | abut to the said piston, and regulates the movement of the said piston.

  According to a fourth aspect of the present invention, the movement restricting member restricts the movement of the piston via a piston abutting member disposed in the cylinder and abutting the piston.

  According to a fifth aspect of the present invention, the piston abutting member is a circumferential member extending in the circumferential direction of the cylinder, and one end side of the piston abutting member abuts on the piston, and the movement restriction An inclined portion extending toward the other end side of the piston contact member and inward in the radial direction is formed at a portion pressed by the member.

  According to the sixth aspect of the present invention, the piston contact member holds the other side of the flexible protection member that is held by the piston and covers the opening side of the cylinder.

  According to the vehicle master cylinder described above, the manufacturing efficiency is improved.

It is a top view showing a 1st embodiment concerning the present invention. It is a front view showing a 1st embodiment concerning the present invention. 1 is a side view showing a first embodiment according to the present invention. It is XX sectional drawing of FIG. 3 which shows 1st Embodiment based on this invention. It is an expanded sectional view of the principal part of FIG. 4 which shows 1st Embodiment which concerns on this invention. It is an expanded sectional view of the principal part corresponding to Drawing 5 showing a 2nd embodiment concerning the present invention. It is an expanded sectional view of the principal part corresponding to Drawing 5 showing a 3rd embodiment concerning the present invention. It is an expanded sectional view of the important section corresponding to Drawing 5 showing a 4th embodiment concerning the present invention.

“First Embodiment”
1st Embodiment which concerns on this invention is described based on FIGS. In the first embodiment, as shown in FIGS. 1 to 3, the reservoir 10 is a reservoir-integrated vehicular master cylinder 11 that constitutes a part of the vehicular master cylinder 11. This vehicle master cylinder 11 is for straddle-type vehicles such as motorcycles, three-wheel buggies, and four-wheel buggies that are attached in a state of being exposed to the outside. Here, the vehicle master cylinder 11 including the reservoir 10 is described as being attached to the vehicle. In this case, the front in the vehicle is “front”, the rear in the vehicle is “rear”, and the left in the vehicle is “left”. The right side of the vehicle will be described as “right”. The first embodiment is a vehicle master cylinder 11 for front wheel braking that is operated by the driver's right hand. The present invention is also applicable to a rear wheel braking master cylinder and a clutch master cylinder operated by the driver's left hand, in which case the left and right in the following description are reversed.

  The vehicle master cylinder 11 is attached to a mounting portion 16 of a steering bar 15 indicated by a two-dot chain line in FIG. 1 of the vehicle. The mounting portion 16 is a portion that is located on the right side of the steering bar 15 and extends in the left-right direction. The steering bar 15 is formed by appropriately bending a cylindrical pipe member, and at least the outer peripheral surface of the mounting portion 16 to which the vehicle master cylinder 11 is attached is cylindrical.

  The vehicular master cylinder 11 is made of metal, the main body member 20 shown in FIG. 1, the holder 21, the two mounting bolts 22 and 22 shown in FIGS. 2 and 3, and the brake lever 23 (operator). A support bolt 24, a support nut 25, a lid member 26, and two mounting screws 27 and 27 shown in FIG. The vehicle master cylinder 11 includes a brake switch 29 (detection member) having a synthetic resin case 28 shown in FIGS. 2 and 3, a metal mounting screw member 30 (movement restricting member), and a latch. It has the washer 31 and the spring washer 32, and the diaphragm 33 which consists of elastic materials, such as rubber | gum shown in FIG. Here, the brake switch 29 is provided to turn on or off a contact inside the brake switch 29 by operating the brake lever 23 to light a brake lamp (not shown) of the vehicle. In the present embodiment, the case 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 by casting, and is disposed on the front side of the mounting portion 16 of the steering bar 15 as shown in FIG. A mounting seat 34 is formed on the right side of the main body member 20 so as to protrude rearward. The body member 20 is attached to the steering bar 15 by sandwiching the mounting portion 16 of the steering bar 15 between the mounting seat portion 34 and the holder 21. The mounting seat 34 and the holder 21 are coupled by two upper and lower mounting bolts 22 and 22 shown in FIGS. 2 and 3 to sandwich the steering bar 15.

  The main body member 20 is formed with a pair of upper and lower plate-like lever support portions 35 and 35 so as to protrude forward as shown in FIG. The brake lever 23 is inserted between these lever support portions 35 and 35. In this state, the support bolt 24 is inserted into the one lever support portion 35, the brake lever 23, and the other lever support portion 35 along the vertical direction and screwed into the support nut 25. Accordingly, the brake lever 23 is rotatably supported by the lever support portions 35 and 35, the support bolt 24, and the support nut 25. At that time, the brake lever 23 rotates around the support bolt 24. As shown in FIG. 1, the brake lever 23 extends rightward from the main body member 20 along the steering bar 15 in front of the steering bar 15. The main body member 20 is formed with a mirror mounting portion 36 to which a rearview mirror (not shown) is attached further above the upper lever support portion 35 shown in FIG. 3, that is, as shown in FIG.

  The main body member 20 is provided with a cylinder 37 extending leftward from the base end side of the lever support portions 35, 35. The cylinder 37 is disposed in front of the steering bar 15 shown in FIG. 1 so as to follow the axial direction of the mounting portion 16. The cylinder 37 is formed in the lower part of the main body member 20 as shown in FIG. A reservoir wall 38 is formed on the upper part of the main body member 20, that is, on the upper side of the cylinder 37. The reservoir wall portion 38 has a cylindrical shape along the vertical direction, and a reservoir chamber 40 in which brake fluid is stored is formed on the inner side by a reservoir bottom portion 39 that closes the cylinder 37 side. The reservoir bottom 39 also constitutes the upper part of the cylinder 37.

  The cylinder 37 has a bottomed cylindrical shape having a cylinder tube portion 45 extending in the left-right direction and a cylinder bottom portion 46 disposed on the opposite side to the lever support portions 35, 35 of the cylinder tube portion 45. In the cylinder 37, a cylinder hole 47 having an opening 48 on the lever support portions 35, 35 side is formed inside the cylinder tube portion 45 and the cylinder bottom portion 46.

  The cylinder hole 47 is along the axial direction of the mounting portion 16 of the steering bar 15 shown in FIG. As shown in FIG. 4, the cylinder hole 47 includes a main hole 51 on the cylinder bottom 46 side, a tapered hole 52 on the opposite side of the main hole 51 with respect to the cylinder bottom 46, and a main hole of the tapered hole 52. 51 has a mouth hole 53 on the opposite side to 51. The end of the mouth hole 53 opposite to the main hole 51 constitutes an opening 48 of the cylinder 37. The main hole 51, the tapered hole 52, and the mouth hole 53 are aligned with the central axis, and this central axis is the central axis of the cylinder hole 47. The center axis of the cylinder hole 47 is set as the center axis of the cylinder 37. Hereinafter, this central axis is referred to as a cylinder axis, a direction along the central axis is referred to as a cylinder axis direction, a direction perpendicular to the central axis of the cylinder 37 is referred to as a cylinder radial direction, and a direction around the central axis of the cylinder 37 is referred to as a cylinder axis. This is called the circumferential direction.

  As shown in FIG. 5, the main hole portion 51 of the cylinder hole 47 has a cylindrical inner peripheral surface 51 a. The tapered hole portion 52 has a tapered diameter-expanded inner peripheral surface 52a that extends toward the opening portion 48 while expanding the diameter from the end edge portion on the opening portion 48 side of the inner peripheral surface 51a, and the diameter-expanded inner peripheral surface 52a. The inner peripheral surface 51a has a taper-shaped enlarged inner peripheral surface 52b extending from the opposite edge to the opening 48 side. In the tapered hole portion 52, the taper amount obtained by dividing the difference in diameter between both ends in the cylinder axis direction by the distance between both ends in the cylinder axis direction is larger on the enlarged inner peripheral surface 52b than on the enlarged inner peripheral surface 52a. Yes.

The mouth hole 53 is reduced in diameter from a cylindrical inner peripheral surface 53a and an end edge on the opposite side to the opening 48 of the inner peripheral surface 53a, and extends to the opposite side with respect to the opening 48. It has an inner peripheral surface 53b and a bottom surface 53c extending inward in the cylinder radial direction from the inner peripheral edge of the reduced diameter inner peripheral surface 53b.
The inner peripheral edge portion of the bottom surface 53 c is connected to the opposite side of the enlarged inner peripheral surface 52 a of the enlarged inner peripheral surface 52 b of the tapered hole portion 52. The bottom surface 53c is parallel to a surface orthogonal to the cylinder axis.

  As shown in FIG. 4, the main hole portion 51 is longer in the cylinder axial direction than the mouth hole portion 53, and is the longest in the cylinder hole 47 in the cylinder axial direction. The main hole 51 has an inner diameter that is smaller than that of the mouth hole 53, and is the smallest in the cylinder radial direction in the cylinder hole 47. The mouth hole 53 is disposed on the most opposite side to the cylinder bottom 46 in the cylinder hole 47.

  A mounting seat 54 to which the brake switch 29 is attached is formed in the cylinder tube portion 45 at the outer lower portion near the boundary between the main hole portion 51 and the mouth hole portion 53. The mounting seat 54 has a main seat portion 55 on the main hole portion 51 side in the cylinder axial direction, and a protruding seat portion 56 on the mouth hole portion 53 side in the cylinder axial direction that projects downward from the main seat portion 55. Yes. The wall portion 57 on the main seat portion 55 side of the projecting seat portion 56 is parallel to a plane orthogonal to the cylinder axis. The mounting seat 54 has a step shape.

  The cylinder tube portion 45 is formed with a radial hole 58 parallel to the cylinder radial direction at the position of the protruding seat portion 56 of the mounting seat 54. The radial hole 58 is a screw hole, and is formed upward from the lower surface of the projecting seat portion 56 perpendicular to the lower surface. The radial hole 58 opens in the inner peripheral surface 53 a of the mouth hole portion 53.

  A screw hole portion 59 is formed in the cylinder bottom portion 46 so as to penetrate the cylinder bottom portion 46. Although not shown in the drawings, the screw hole 59 is screwed with a bolt that attaches the base of the brake pipe to the cylinder 37. A passage for communicating the inside of the main hole 51 and the brake pipe is formed in this bolt. The brake pipe communicates with a wheel cylinder of a brake device such as a disc brake provided on the wheel side. The cylinder bottom portion 46 is formed with a restricting convex portion 61 that protrudes on the opposite side to the cylinder tube portion 45 and restricts the rotation of the base of the brake pipe.

  The reservoir bottom 39 is formed with a first communication hole 62 that connects the inside of the main hole 51 and the storage chamber 40 in parallel to the cylinder radial direction. The first communication hole 62 is a stepped hole that gradually decreases in diameter from the storage chamber 40 side to the main hole 51 side. In addition, a second communication hole (not shown) is formed in the reservoir bottom 39 on the cylinder bottom 46 side of the first communication hole 62.

  The reservoir wall portion 38 includes a side wall portion 65 disposed on the cylinder bottom 46 side, that is, the left side, a front wall portion 66 disposed on the front side, and a side wall portion 67 disposed on the opposite side, that is, the right side with respect to the cylinder bottom portion 46. And a rear wall portion 68 shown in FIG. 2 disposed on the rear side. That is, the reservoir wall portion 38 has a rectangular cylindrical shape. The reservoir wall portion 38 is formed to surround the storage chamber 40 shown in FIG. 4 by the side wall portion 65, the front wall portion 66, the side wall portion 67 and the rear wall portion 68 shown in FIG. It is open.

  The diaphragm 33 includes a frame-shaped plate portion 69 having a rectangular frame shape placed on the upper surface of the reservoir wall portion 38, and a cylindrical outer tube extending downward from the inner peripheral edge of the frame-shaped plate portion 69. , A frame-like lower plate portion 71 extending inward from the lower edge of the outer tubular portion 70, and a cylindrical intermediate tube extending upward from the inner peripheral edge of the lower plate portion 71 And an upper plate portion 73 that extends inwardly from the upper end edge of the intermediate cylindrical portion 72. The outer cylindrical portion 70, the lower plate portion 71, the intermediate cylindrical portion 72, and the upper plate portion 73 are disposed in the storage chamber 40. The diaphragm 33 divides the storage chamber 40 into a liquid chamber 74 that stores brake fluid below the diaphragm 33 and an air chamber 75 that communicates with the atmosphere above the diaphragm 33. The diaphragm 33 can follow the variation in the amount of brake fluid in the fluid chamber 74 by being deformed.

  The lid member 26 is an integrally molded product by casting, and covers the diaphragm 33 on the upper side. The lower surface of the lid member 26 sandwiches the frame-shaped plate portion 69 of the diaphragm 33 with the upper surface of the reservoir wall portion 38. In this state, the lid member 26 is fixed to the reservoir wall portion 38 shown in FIG. 4 by mounting screws 27, 27 shown in FIG. As described above, the diaphragm 33 is directly sandwiched between the reservoir wall 38 of the main body member 20 and the lid member 26.

  The vehicle master cylinder 11 includes a return spring 76, a piston 77, a cup seal 78, a cup seal 79, and a boot 80. These are all disposed in the cylinder hole 47 described above. The boot 80 includes a boot body 81 and a 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 made of an elastic material such as rubber.

  The piston 77 includes a columnar shaft portion 85, a disk-shaped flange portion 86, a columnar shaft portion 87, a disk-shaped flange portion 88, a columnar shaft portion 89, and a disk-shaped shaft portion. It has a flange portion 90, a columnar shaft portion 91, a disk-shaped flange portion 92, a columnar shaft portion 93, a columnar shaft portion 94, and a disk-shaped flange portion 95. These are formed coaxially with a common central axis.

  The shaft portion 85 is formed on the cylinder bottom 46 side of the piston 77, that is, on the left side. The flange portion 86 is disposed on the opposite side to the cylinder bottom portion 46 of the shaft portion 85, that is, on 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 of 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 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 of the shaft portion 87 of the flange portion 88. The shaft portion 89 has an outer diameter smaller than the outer diameter of the flange portion 88. The flange portion 90 is disposed on the opposite side to the flange portion 88 of the shaft portion 89. The outer diameter of the flange portion 90 is the same as the outer diameter of the flange portion 88. The shaft portion 91 is disposed on the opposite side to the shaft portion 89 of the flange portion 90. The shaft portion 91 has an outer diameter smaller than the outer diameter of the flange portion 90.

  The flange portion 92 is disposed on the opposite side to the flange portion 90 of the shaft portion 91. The outer diameter of the flange portion 92 is the same as the outer diameter of the flange portion 90. The shaft portion 93 is disposed on the opposite side of the shaft portion 91 of the flange portion 92. The shaft portion 93 has an outer diameter smaller than the outer diameter of the flange portion 92. The shaft portion 94 is disposed on the opposite side 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 disposed on the opposite side to the shaft portion 93 of the shaft portion 94. The outer diameter of the flange portion 95 is larger than the outer diameter of the shaft portion 94 and is the same diameter as the outer diameter of the shaft portion 93. The flange portion 95 is formed on the most opposite side of the piston 77 with respect to 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 hole 47 at the flange portions 88, 90, and 92. Accordingly, the piston 77 is slidably provided on the cylinder 37 and moves in the cylinder axial direction.

  The return spring 76 is a tapered coil spring whose one end side in the cylinder axial direction has a larger diameter than the other end side, abuts against the cylinder bottom 46 at the end on the large diameter side, and the piston 77 on the inside at the end on the small diameter side. The shaft portion 85 is inserted into contact with the flange portion 86.

  The cup seal 78 has a C-shape in which one side shape of the cross section on the surface including the central axis opens to one side in the cylinder axial direction. The cup seal 78 is disposed between the flange portions 86 and 88 of the piston 77 and is fitted to the shaft portion 87. The cup seal 78 is in a state where the C-shaped opening side is arranged on the flange portion 86 side, and the outer peripheral portion is in sliding contact with the inner peripheral surface 51 a of the main hole portion 51.

  The cup seal 79 has a C-shape in which one side shape of the cross section on the plane including the central axis opens to one side in the cylinder axial direction. The cup seal 79 is disposed between the flange portions 90 and 92 of the piston 77 and is 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 in sliding contact with the inner peripheral surface 51 a of the main hole portion 51.

  As shown in FIG. 5, the mounting screw member 30 includes a disk-shaped head 105, a columnar screw shaft 106 having a smaller diameter than the head 105 and extending from the head 105, and the head of the screw shaft 106. It has a columnar tip shaft portion 107 extending from the opposite side to the portion 105. The head portion 105, the screw shaft portion 106, and the tip shaft portion 107 are formed coaxially. The distal end shaft portion 107 includes a cylindrical outer peripheral surface 107a, a reduced diameter outer peripheral surface 107b extending from the end edge portion on the opposite side of the outer peripheral surface 107a with respect to the screw shaft portion 106, and a central axis. And a flat front end surface 107c orthogonal to each other. A C-shaped spring washer 32 and an annular locking washer 31 are attached to the attachment screw member 30 in advance by inserting the distal end shaft portion 107 and the screw shaft portion 106 inside thereof. The locking washer 31 is locked to the mounting screw member 30 and restricts the spring washer 32 from coming off from the mounting screw member 30.

  The case 28 of the brake switch 29 has a main portion 110 and a mounting portion 111 that is thinner than the main portion 110. A wall portion 112 is formed on the attachment portion 111 side of the main portion 110 of the case 28 along the vertical direction and along the front-rear direction. A through hole 113 penetrating in the thickness direction is formed in the attachment portion 111. In the brake switch 29, the main portion 110 contacts the main seat portion 55 of the mounting seat 54, the mounting portion 111 contacts the protruding seat portion 56, and the wall portion 112 contacts the wall portion 57.

  In this state, the distal end shaft portion 107 and the screw shaft portion 106 of the mounting screw member 30 in which the locking washer 31 and the spring washer 32 are previously attached are inserted into the through hole 113 of the brake switch 29, and the screw shaft portion 106. Is screwed into a radial hole 58 which is a screw hole of the cylinder tube portion 45. Thus, by inserting the mounting screw member 30 while screwing it into the radial hole 58, the head portion 105 of the mounting screw member 30 causes the spring washer 32, the locking washer 31 and the mounting portion 111 of the brake switch 29 to be connected to the cylinder tube portion. Therefore, the brake switch 29 is fixed to the cylinder 37.

  The mounting screw member 30 in a state where the brake switch 29 is fixed to the cylinder 37 has a length such that the tip shaft portion 107 protrudes inward in the cylinder radial direction from the flange portion 92 of the piston 77. The brake switch 29 is fixed to the cylinder 37 in a state where the flange portion 92 of the piston 77 is disposed on the opposite side of the opening portion 48 with respect to the tip shaft portion 107 of the mounting screw member 30. Then, even if the piston 77 is pressed by the return spring 76 shown in FIG. 4 and moves in the direction of coming out of the cylinder hole 47, the mounting screw member 30 comes into contact with the flange portion 92 of the piston 77 as shown in FIG. And restrict this movement.

  That is, the mounting screw member 30 is inserted into the radial hole 58 formed in the cylinder 37 and restricts the movement of the piston 77 relative to the cylinder 37. Here, the flange portion 92 has a cylindrical outer peripheral surface 92a that is the maximum outer diameter portion, and a reduced diameter that extends toward the shaft portion 93 while reducing the diameter from the end portion of the outer peripheral surface 92a on the shaft portion 93 side. It has an outer peripheral surface 92b and an end surface 92c extending inward in the cylinder radial direction from the reduced diameter outer peripheral surface 92b. The end surface 92c is parallel to a surface orthogonal to the cylinder axis. The mounting screw member 30 is in contact with the reduced diameter outer peripheral surface 92b of the flange portion 92 at the reduced diameter outer peripheral surface 107b of the tip shaft portion 107 which is inclined. Here, by increasing the length of the distal end shaft portion 107, the cylindrical outer peripheral surface 107 a of the distal end shaft portion 107 may be brought into contact with the end surface 92 c of the flange portion 92.

  When the brake lever 23 is not operated, the brake switch 29 is pressed by the brake lever 23 to be turned off. When the brake lever 23 is operated and the brake lever 23 is released, the brake switch 29 is turned on. To detect.

  The boot body 81 of the boot 80 has a cylindrical shape, and includes a fitting portion 115 at one end, an intermediate flexible portion 116, and a fitting portion 117 at the other end. The fitting part 115 and the fitting part 117 are annular. The flexible portion 116 has a cylindrical shape that is thinner than the fitting portion 115 and the fitting portion 117 in the cylinder radial direction, and has flexibility. A mounting groove 118 is formed inside the fitting portion 117 of the boot body 81 in the cylinder radial direction, and a rigid ring 82 is mounted in the mounting groove 118.

  In the boot 80, the fitting portion 115 at one end of the boot main body 81 is disposed between the shaft portion 93 and the flange portion 95 of the piston 77 and is fitted into the shaft portion 94. Further, the boot 80 has a flexible portion 116 extending from the outer peripheral side of the fitting portion 115 once extended to the opposite side with respect to the flange portion 92, and then folded back to the outside in the cylinder radial direction so as to be within the mouth hole portion 53. Thus, the flange portion 92 is extended to the side. Further, the boot 80 comes into contact with the inner peripheral surface 53 a of the mouth hole portion 53 in a state where the fitting portion 117 at the other end is prevented from being deformed in the cylinder radial direction by the rigid ring 82. Thus, the boot 80 holds the one fitting portion 115 on the piston 77 and covers and protects the opening portion 48 side of the cylinder 37.

  When the return spring 76, piston 77, cup seals 78, 79 and boot 80 shown in FIG. 4 are assembled to the cylinder hole 47, the cup seals 78, 79 and boot 80 are assembled to the piston 77 in advance. That is, the cup seal 78 is fitted into the groove portion formed by the flange portion 86, the shaft portion 87, and the flange portion 88 of the piston 77. In addition, a cup seal 79 is fitted into a groove formed by the flange portion 90, the shaft portion 91, and the flange portion 92 of the piston 77. Further, the boot 80 with the rigid ring 82 previously attached to the boot body 81 is attached to the piston 77. At that time, as shown in FIG. 5, the fitting portion 115 is fitted into the groove portion including the shaft portion 93, the shaft portion 94, and the flange portion 95 of the piston 77, and the flexible portion 116 is moved from the fitting portion 115. After extending to the opposite side with respect to the flange portion 92, it is folded back to the outside in the cylinder radial direction so as to extend to the flange portion 92 side.

  Then, the return spring 76 shown in FIG. 4 is inserted into the cylinder hole 47, and the piston 77 in the above state is inserted into the cylinder hole 47. At this time, the fitting portion 117 shown in FIG. 5 of the boot 80 is also fitted into the mouth hole portion 53 of the cylinder hole 47. However, the end surface 117 a opposite to the fitting portion 115 of the fitting portion 117 is set to be positioned closer to the opening 48 than the radial hole 58. In this state, the brake switch 29 is disposed on the mounting seat 54, and the piston 77 is disposed so as to contract the return spring 76, and a predetermined amount is set so that the flange portion 92 is located on the opposite side of the opening portion 48 with respect to the radial hole 58. In the pushed state, the screw shaft portion 106 of the mounting screw member 30 is screwed into the radial hole 58.

  Thereby, the mounting screw member 30 fixes the brake switch 29 to the cylinder 37. At the same time, the front end surface 107 c of the front end shaft portion 107 of the mounting screw member 30 is positioned on the inner side in the cylinder radial direction than the outer peripheral surface 92 a of the flange portion 92. As a result, the attachment screw member 30 abuts against the flange portion 92 of the piston 77, and thus the movement of the piston 77 in the direction of coming out of the cylinder hole 47 is restricted. In this state, the piston 77 provided in the cylinder 37 can move along the cylinder axial direction in a direction opposite to the opening 48 from the position where movement of the mounting screw member 30 is restricted.

  Thereafter, the fitting portion 117 of the boot 80 is pushed into a predetermined position with a jig. Thus, in the boot 80, the fitting portion 115 on one side is held by the piston 77, and the fitting portion 117 on the other end abuts on the inner peripheral surface 53 a of the mouth hole portion 53 over the entire circumference, thereby opening the cylinder 37. It will be in the state which covers the part 48 side. The position where the flange portion 92 is brought into contact with the mounting screw member 30 is the standby position of the piston 77 when the brake lever 23 is not operated.

  The cylinder hole 47 is filled with brake fluid on the cylinder bottom 46 side shown in FIG. 4 rather than the cup seal 79 of the piston 77. Further, the cup seal 78 forms a hydraulic pressure chamber 120 that communicates with a wheel cylinder (not shown) by the piston 77, the cylinder tube portion 45, and the cylinder bottom portion 46.

  A pressing portion 125 of the brake lever 23 is disposed on the opposite side of the flange portion 95 of the piston 77 to the cylinder bottom portion 46. When the brake lever 23 is operated, the pressing portion 125 moves to the cylinder bottom portion 46 side, that is, the left side, and the piston 77 is pressed in this direction. Then, the piston 77 and the cup seal 78 are integrally moved in the direction of narrowing the hydraulic pressure chamber 120. When the cup seal 78 passes the second communication hole (not shown), the hydraulic pressure chamber 120, the storage chamber 40, The brake fluid is supplied from the hydraulic chamber 120 to a wheel cylinder (not shown).

  That is, in the vehicular master cylinder 11, the piston 77 is propelled toward the cylinder bottom 46 by operating the brake lever 23 to generate the brake fluid pressure. At this time, the cup seal 78 and the cup seal 79 communicate with the storage chamber 40 through the first communication hole 62. When the operation of the brake lever 23 is released, the piston 77 is returned by the urging force of the return spring 76, and the brake fluid of the wheel cylinder (not shown) is returned to the hydraulic pressure chamber 120. Here, when the amount of the brake friction material of the brake device decreases, the volume of the hydraulic chamber on the wheel cylinder side increases. In the vehicular master cylinder 11, when the brake lever 23 is not in the operating state, the hydraulic chamber 120 communicates with the storage chamber 40 through a second communication hole (not shown). To the hydraulic chamber 120.

  The reservoir wall 38 and the reservoir bottom 39 of the main body member 20, the lid member 26, the diaphragm 33, and the mounting screws 27 and 27 are provided on the upper portion of the cylinder 37 to constitute the reservoir 10 in which brake fluid is stored. ing. Therefore, the reservoir 10 is integrally connected to a vehicle master cylinder 11 that supplies brake fluid to the wheel cylinder.

  In the master cylinder described in Patent Document 1, a covering member that covers the opening side of the cylinder is attached to the cylinder by a locking member that is locked to the opening of the cylinder, and piston disengagement is regulated through the covering member. It is like that. For this reason, a locking member is required, and it is necessary to form a locking groove for locking the locking member on the inner peripheral surface of the opening of the cylinder. Therefore, manufacturing such as cutting of the locking groove and insertion of the locking member is complicated, and it takes time to manufacture. Further, since the number of parts increases, the part cost and the assembly cost increase, and the processing cost increases because the locking groove is formed.

  On the other hand, the above-described vehicular master cylinder 11 is formed with a radial hole 58 that opens in the cylinder hole 47 in the cylinder 37. Further, the mounting screw member 30 for fixing the brake switch 29 for detecting the operation of the brake lever 23 to the cylinder 37 is inserted into the radial hole 58. Then, the attachment screw member 30 restricts the movement of the piston 77 in the direction of coming off from the cylinder 37. In this way, the mounting screw member 30 that fixes the brake switch 29 to the cylinder 37 restricts the movement of the piston 77 in the removal direction and stops the piston 77 at the standby position, so that an increase in the number of parts can be suppressed. Therefore, the manufacturing efficiency of the vehicle master cylinder can be improved. Moreover, the increase in component cost and assembly cost can be suppressed. Furthermore, since it is sufficient that the radial hole 58 necessary for mounting the mounting screw member 30 has a depth that opens into the cylinder hole 47, it is possible to suppress an increase in processing man-hours, man-hours for processing accuracy management, and processing costs. it can.

“Second Embodiment”
Next, the second embodiment will be described mainly based on FIG. 6 with a focus on the differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  In the vehicle master cylinder 11A of the second embodiment, a mounting screw member 30A having a partially different configuration from the mounting screw member 30 (see FIG. 5) of the first embodiment is used. Specifically, the attachment screw member 30A does not have the tip shaft portion 107 of the first embodiment, and has a screw shaft portion 106A that is partially different from the screw shaft portion 106 of the first embodiment. The screw shaft portion 106A is formed with a reduced-diameter outer peripheral surface 106Aa having a diameter reduced toward the tip side and a tip surface 106Ab orthogonal to the central axis of the screw shaft portion 106A at the tip portion opposite to the head portion 105. Yes. In the second embodiment, a metal piston contact member 130 </ b> A (circumferential member) that is disposed in the cylinder hole 47 of the cylinder 37 and contacts the flange portion 92 of the piston 77 is provided. The piston contact member 130A is formed by cutting, for example.

  The piston abutting member 130A has an annular shape. In the piston abutting member 130A, the inner peripheral surface 130Aa has a cylindrical surface shape, and the outer peripheral surface 130Ab has a cylindrical surface shape. In the piston contact member 130A, both end surfaces 130Ac and end surfaces 130Ad on both sides in the cylinder axis direction are flat surfaces parallel to the cylinder axis orthogonal surface. The piston abutting member 130A is inserted into the mouth hole 53 while the shaft portion 93 of the piston 77 is inserted inside. In this state, the piston abutting member 130A has an annular shape extending in the cylinder circumferential direction. In the piston contact member 130 </ b> A, the minimum diameters of the end faces 130 </ b> Ac and 130 </ b> Ad are smaller than the maximum diameter of the end face 92 c of the flange portion 92 of the piston 77.

  In the second embodiment, when the cup seal 78 (see FIG. 4), the cup seal 79, and the boot 80 are assembled to the piston 77 in advance, the piston contact member 130A is also assembled. That is, the piston abutting member 130A is attached to the piston 77 such that the shaft portions 93 and 94 and the flange portion 95 are inserted therein. Thereafter, the fitting portion 115 of the boot 80 in a state where the rigid ring 82 is previously attached to the boot main body 81 is fitted into the groove portion including the shaft portion 93, the shaft portion 94, and the flange portion 95 of the piston 77.

  And after extending the flexible part 116 to the opposite side with respect to the flange part 92 from the fitting part 115, it is made into the state extended by the outer side of a cylinder radial direction, and extending to the flange part 92 side. The piston contact member 130 </ b> A is sandwiched between the flange portion 92. At this time, one end surface 130Ac of the piston contact member 130A is brought into contact with the end surface 92c of the flange portion 92, and the other end surface 130Ad is brought into contact with the end surface 117a opposite to the fitting portion 115 of the fitting portion 117. . Thereby, the piston contact member 130 </ b> A is temporarily assembled to the piston 77.

  Then, a return spring 76 (see FIG. 4) is inserted into the cylinder hole 47, and the piston 77 in a state in which the cup seal 78 (see FIG. 4), the cup seal 79, the boot 80, and the piston contact member 130A are assembled in advance. Insert into the cylinder hole 47. Next, the piston 77 and the fitting portion 117 of the boot 80 are pushed in by a predetermined amount using a jig, and these are positioned in the cylinder axial direction with respect to the mouth hole portion 53.

  At this time, the boundary corner portion between the end surface 130Ac of the piston contact member 130A and the outer peripheral surface 130Ab may be positioned in contact with the reduced inner peripheral surface 53b of the mouth hole portion 53. Further, a reduced diameter outer peripheral surface having a smaller diameter toward the end surface 130Ac side is formed at the boundary between the end face 130Ac and the outer peripheral face 130Ab of the piston contact member 130A, and this reduced outer peripheral face is used as the reduced inner peripheral face of the mouth hole 53. Positioning may be performed in contact with 53b. Further, the contact with the reduced diameter inner peripheral surface 53 b of the lip hole portion 53 may be escaped by this reduced diameter outer peripheral surface, and the end surface 130 Ac may be brought into contact with the bottom surface 53 c of the lip hole portion 53 for positioning.

  With the piston 77 and the piston contact member 130A positioned in the cylinder axial direction with respect to the mouth hole portion 53, the brake switch 29 is disposed on the mounting seat 54, and the screw shaft portion 106A of the mounting screw member 30A is disposed in the radial hole 58. Screwed on. Thereby, the mounting screw member 30 </ b> A fixes the brake switch 29 to the cylinder 37. At the same time, the tip surface 106Ab of the screw shaft portion 106A of the mounting screw member 30A abuts on the outer peripheral surface 130Ab of the piston abutting member 130A, and the other outer peripheral surface 130Ab is connected to the inner peripheral surface of the mouth hole portion 53. Press against 53a. As a result, the piston contact member 130 </ b> A is fixed to the cylinder 37.

  The piston abutting member 130A fixed to the cylinder 37 with the mounting screw member 30A in this way makes the end surface 92c abut on the end surface 130Ac over the entire circumference, so that the piston abutting member 130A can be removed from the cylinder hole 47 of the piston 77. It will be in the state which regulates movement. The position where the flange portion 92 is brought into contact with the piston contact member 130A is the standby position of the piston 77 in a state where the brake lever 23 is not operated.

  Here, the piston abutting member 130 </ b> A may not be an annular shape as long as it is a member extending in the circumferential direction of the cylinder 37, and may be a C-shaped member in which a part of the annular ring is broken, for example.

  According to the second embodiment described above, the mounting screw member 30 </ b> A restricts the movement of the piston 77 via the piston contact member 130 </ b> A that is disposed in the cylinder 37 and contacts the piston 77. For this reason, it is possible to easily increase the area of the portion that comes into contact with the piston 77 when the movement is restricted, as compared with the case where the movement is restricted by direct contact with the mounting screw member 30. That is, since the piston abutting member 130 </ b> A has a shape extending in the circumferential direction of the cylinder 37, the area of the portion that abuts on the piston 77 can be increased when the movement is restricted. Thereby, the damage of the piston 77 can be suppressed.

“Third Embodiment”
Next, the third embodiment will be described mainly on the basis of FIG. 7, focusing on the differences from the first and second embodiments. In addition, about the site | part which is common in 1st, 2nd embodiment, it represents with the same name and the same code | symbol.

  In the vehicle master cylinder 11B of the third embodiment, a main body member 20B having a partially different structure from the main body member 20 (see FIGS. 5 and 6) of the first and second embodiments is used. The main body member 20B is formed with a radial hole 58B in which the formation position in the cylinder axial direction is shifted to the opening 48 side with respect to the radial hole 58 of the first and second embodiments. As a result, the main body member 20B has the cylinder 37, the cylinder tube portion 45, the cylinder hole 47, the mounting seat 54, the protruding seat portion 56, the mouth hole portion 53, and the inner peripheral surface 53a of the first and second embodiments. It has a cylinder 37B, a cylinder tube portion 45B, a cylinder hole 47B, a mounting seat 54B, a protruding seat portion 56B, a mouth hole portion 53B, and an inner peripheral surface 53Ba in which a radial hole 58B having a position different from that of the radial hole 58 is formed. ing.

  In the third embodiment, in accordance with the above, a brake switch 29B having a partially different configuration from the brake switch 29 (see FIGS. 5 and 6) of the first and second embodiments is used. That is, the brake switch 29B is formed with a through hole 113B whose position is shifted from the through hole 113 of the first and second embodiments. Thus, the brake switch 29B has a case 28B and a mounting portion 111B in which a through hole 113B having a position different from the through hole 113 is formed with respect to the case 28 and the mounting portion 111 of the first and second embodiments. ing.

  In the third embodiment, a mounting screw member 30B having a partially different configuration from the mounting screw member 30A (see FIG. 6) of the second embodiment is used. Specifically, a screw shaft portion 106B that is slightly longer than the screw shaft portion 106A of the second embodiment is formed on the mounting screw member 30B. The screw shaft portion 106B has a reduced diameter outer peripheral surface 106Ba that is longer than the reduced diameter outer peripheral surface 106Aa of the second embodiment, and a tip surface 106Bb that is smaller in diameter than the tip surface 106Ab of the second embodiment. ing.

  In the third embodiment, a piston contact member 130B having a partially different configuration from the piston contact member 130A (see FIG. 6) of the second embodiment is used. Specifically, the piston abutting member 130B is thinner in the cylinder axial direction than the piston abutting member 130A of the second embodiment, and is disposed on the outer peripheral portion on one side in the cylinder axial direction. An inclined portion 131B having an inclined surface 130Be whose diameter decreases toward the tip end side in the cylinder axial direction is formed. Accordingly, the piston abutting member 130B includes the inner peripheral surface 130Ba and the outer peripheral surface 130Bb that are narrower in the cylinder axial direction than the inner peripheral surface 130Aa and the outer peripheral surface 130Ab of the second embodiment, and the end surface 130Ac of the first embodiment. It has the same end surface 130Bc and end surface 130Bd whose width in the cylinder radial direction is narrower than the end surface 130Ad of the first embodiment. In the piston contact member 130 </ b> B, at least the minimum diameter of the end surface 130 </ b> Bc is smaller than the maximum diameter of the end surface 92 c of the flange portion 92 of the piston 77.

  In the third embodiment, as in the second embodiment, a cup seal 78 (see FIG. 4), a cup seal 79, a boot 80, and a piston abutting member 130B are assembled in advance to the piston 77. At this time, the piston abutting member 130 </ b> B is assembled such that the inclined surface 130 </ b> Be and the end surface 130 </ b> Bd face the opposite side of the flange portion 92 of the piston 77.

  Then, the return spring 76 (see FIG. 4) is inserted into the cylinder hole 47B, and the cup seal 78 (see FIG. 4), the cup seal 79, the boot 80, and the piston contact member 130B are assembled in advance. The piston 77 is inserted into the cylinder hole 47B. Then, the piston 77 and the fitting portion 117 of the boot 80 are pushed in by a predetermined amount by the jig, and the piston contact member 130B is positioned at a predetermined position opposite to the opening 48 of the radial hole 58B.

  At this time, the boundary corner portion between the end surface 130Bc and the outer peripheral surface 130Bb of the piston contact member 130B may be positioned by contacting the reduced inner peripheral surface 53b of the mouth hole portion 53B. Further, a reduced diameter outer peripheral surface having a smaller diameter toward the end face 130Bc side is formed at the boundary between the end face 130Bc and the outer peripheral face 130Bb of the piston contact member 130B, and this reduced outer peripheral face is used as the reduced inner peripheral face of the mouth hole 53B. Positioning may be performed in contact with 53b. Further, the contact with the reduced diameter inner peripheral surface 53b of the mouth hole portion 53B may be escaped by this reduced diameter outer peripheral surface, and the end surface 130Bc may be brought into contact with the bottom surface 53c of the mouth hole portion 53B for positioning.

  With the piston 77 and the piston contact member 130B positioned in the cylinder axial direction with respect to the mouth hole 53B, the brake switch 29B is disposed on the mounting seat 54B, and the screw shaft portion 106B of the mounting screw member 30B is placed in the radial hole 58B. The brake switch 29B is fixed to the cylinder 37B.

  Then, the diameter-reduced outer peripheral surface 106Ba of the mounting screw member 30B is adjacent to the opening 48 side in the cylinder axial direction with the cylinder radial direction position superimposed on the inclined surface 130Be of the inclined portion 131B of the piston contact member 130B. It becomes. As a result, the mounting screw member 30B regulates the further movement of the piston contact member 130B from the cylinder 37B beyond the reduced diameter outer peripheral surface 106Ba abuts against the inclined surface 130Be of the piston contact member 130B. It will be.

  The piston abutting member 130B in a state in which the movement in the pulling direction from the cylinder 37B is restricted by the mounting screw member 30B in this manner is caused by abutting the end surface 92c of the flange portion 92 on the entire end surface 130Bc. In this state, the movement of the piston 77 in the direction away from the cylinder hole 47B is restricted. The position where the flange 92 is brought into contact with the piston contact member 130B that is in contact with the mounting screw member 30B is the standby position of the piston 77 when the brake lever 23 is not operated. When the screw shaft portion 106B of the mounting screw member 30B is screwed into the radial hole 58B, the reduced-diameter outer peripheral surface 106Ba of the mounting screw member 30B presses and moves the fitting portion 117 of the boot 80 toward the opening 48. become.

  Here, when the brake switch 29B is fixed, the inclined surface 130Be of the inclined portion 131B of the piston contact member 130B may be pressed by the reduced diameter outer peripheral surface 106Ba of the mounting screw member 30B. Then, by this pressing, the boundary corner portion between the end surface 130Bc of the piston contact member 130B and the outer peripheral surface 130Bb is pressed against the reduced inner peripheral surface 53b of the mouth hole portion 53B, and the outer peripheral surface 130Bb is pressed against the inner peripheral surface of the mouth hole portion 53B. You may make it press on 53Ba. In this way, when the mounting screw member 30B fixes the brake switch 29B to the cylinder 37B, the piston contact member 130B is also positioned relative to the cylinder 37B and fixed immovably.

  In this case, a reduced diameter outer peripheral surface having a smaller diameter toward the end face 130Bc side is formed at the boundary between the end face 130Bc and the outer peripheral face 130Bb of the piston contact member 130B, and this reduced outer peripheral face is used as the inner diameter of the mouth hole 53B. The positioning may be fixed by contacting the surface 53b. Further, the end surface 130Bc is brought into contact with the bottom surface 53c of the mouth hole 53B so as to escape from contact with the diameter-reduced inner surface 53b of the mouth hole 53B by this reduced diameter outer surface, and is positioned and fixed. good.

  The piston abutting member 130B may not be an annular shape as long as it is a member extending in the circumferential direction of the cylinder 37B. For example, the piston abutting member 130B may be a C-shaped member in which a part of the annular ring is broken.

  According to the third embodiment described above, the piston abutting member 130B extends in the cylinder circumferential direction, and one end side of the piston abutting member 130B abuts against the piston 77 and a portion abutting against the mounting screw member 30B. An inclined portion 131B having an inclined surface 130Be extending toward the other end side of the piston contact member 130B and inward in the cylinder radial direction is formed. Therefore, the mounting screw member 30B overlaps with the piston contact member 130B in the cylinder radial direction. Therefore, even if some looseness occurs in the mounting screw member 30B, the piston abutting member 130B can be prevented from moving beyond the mounting screw member 30B.

  The piston contact member 130B has an inclined portion 131B. Therefore, even if the piston contact member 130B overlaps the mounting screw member 30B in the cylinder radial direction, the length in which the piston contact member 130B and the mounting screw member 30B overlap in the cylinder axial direction can be increased. Therefore, it is possible to suppress an increase in the axial direction of the cylinder 37B. In addition, the piston abutting member 130B can be positioned by restricting movement in the cylinder axial direction.

“Fourth Embodiment”
Next, the fourth embodiment will be described mainly with reference to FIG. 8 focusing on the differences from the first to third embodiments. In addition, about the site | part which is common in 1st-3rd embodiment, it represents with the same name and the same code | symbol.

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

  In the fourth embodiment, a boot 80C having a partially different configuration from the boot 80 (see FIGS. 5 to 7) of the first to third embodiments is used. The boot 80C has a boot body 81C (flexible protective member) that is partially different from the boot body 81 of the first to third embodiments. The boot main body 81C covers and protects the opening portion 48 side of the cylinder 37B, similarly to the boot main body 81, and includes a flexible portion 116C longer than the flexible portion 116 of the first to third embodiments, It has the fitting part 117C different from the fitting part 117 of 1st-3rd embodiment. The fitting portion 117C includes an annular outer ridge portion 151C, 152C that protrudes outward in the cylinder radial direction along with the cylinder axis direction, an outer ridge portion 151C opposite to the flexible portion 116, and the cylinder shaft. An annular inner ridge portion 153C that protrudes inward in the cylinder radial direction with the position in the direction aligned. The boot 80C has a piston contact member 130C attached to the fitting portion 117C.

  The piston contact member 130C is formed by bending a metal plate, and includes an inner cylinder portion 161C, a curved cylinder portion 162C, an end plate portion 163C, a curved cylinder portion 164C, an outer cylinder portion 165C, and a tapered cylinder portion. It has an annular shape having 166C (inclined portion). The inner cylinder portion 161C has a cylindrical shape. The curved cylindrical portion 162C extends while curving so as to increase in diameter toward the outer side in the cylinder axial direction from one end edge portion in the cylinder axial direction of the inner cylindrical portion 161C. The end plate portion 163C is a flat plate shape that extends outward in the cylinder radial direction from the large-diameter end edge portion of the curved cylindrical portion 162C and is parallel to a plane orthogonal to the central axis of the inner cylindrical portion 161C. I am doing. The curved plate portion 164C extends while being curved so as to be located on the same side as the inner cylindrical portion 161C in the cylinder axial direction from the outer peripheral edge portion of the end plate portion 163C to the outer side. The outer cylinder portion 165C has a cylindrical shape, and extends in a direction away from the end plate portion 163C from an end edge on the opposite side to the end plate portion 163C of the curved plate portion 164C. The tapered cylindrical portion 166C extends in a direction away from the end plate portion 163C from the end edge portion on the opposite side to the curved cylindrical portion 164C of the outer cylindrical portion 165C, and has a smaller diameter toward the extended distal end side.

  The piston contact member 130C has an annular fitting groove 167C on the inner side of the inner cylindrical portion 161C, the curved cylindrical portion 162C, the end plate portion 163C, the curved cylindrical portion 164C, the outer cylindrical portion 165C, and the tapered cylindrical portion 166C. Is formed. The fitting groove 167C is open to the outside between the inner cylindrical portion 161C and the tapered cylindrical portion 166C.

  The fitting portion 117C of the boot main body 81C is fitted into the fitting groove 167C through an opening between the inner cylindrical portion 161C and the tapered cylindrical portion 166C. At that time, the fitting portion 117C causes the inner ridge portion 153C to abut on the inner cylinder portion 161C and the curved cylinder portion 162C, and causes the outer ridge portion 151C to abut on the curved cylinder portion 164C and the outer cylinder portion 165C. The outer protruding portion 152C is brought into contact with the outer cylindrical portion 165C and the tapered cylindrical portion 166C. Thereby, the piston contact member 130 </ b> C is held by the fitting portion 117 </ b> C at the other end of the boot body 81 </ b> C in which the fitting portion 115 on one side is held by the piston 77. The piston abutting member 130C is inserted into the mouth hole portion 53B while the piston 77 is inserted inside the inner cylinder portion 161C. In this state, the piston contact member 130C has an annular shape extending in the cylinder circumferential direction.

  The inner peripheral surface 161Ca of the inner cylindrical portion 161C has a cylindrical surface shape, and the outer peripheral surface 165Ca of the outer cylindrical portion 165C also has a cylindrical surface shape. The outer end surface 163Ca of the end plate portion 163C on one side in the cylinder axis direction is a flat surface parallel to the cylinder axis orthogonal surface. The outer side in the cylinder radial direction of the tapered cylindrical portion 166C is a tapered outer peripheral surface 166Ca having a tapered surface shape that decreases in diameter as it is farther from the end surface 163Ca and extends inward in the cylinder radial direction. The inner peripheral surface 161Ca, the end surface 163Ca, the outer peripheral surface 165Ca, and the reduced-diameter outer peripheral surface 166Ca are coaxial. In the piston contact member 130 </ b> C, at least the minimum diameter of the end surface 163 </ b> Ca is smaller than the maximum diameter of the end surface 92 c of the flange portion 92 of the piston 77.

  In the fourth embodiment, as in the second embodiment, a cup seal 78 (see FIG. 4), a cup seal 79, and a boot 80C are assembled to the piston 77 in advance. At this time, the piston abutting member 130C and the boot main body 81C are in separate states, and the piston abutting member 130C is first, and the tapered cylindrical portion 166C faces the side opposite to the flange portion 92, and the piston The shaft portions 93 and 94 of the 77 and the flange portion 95 are inserted, and the boot 80 </ b> C is disposed on the piston 77. Thereafter, the fitting portion 115 of the boot main body 81 </ b> C is fitted into the groove portion including the shaft portion 93, the shaft portion 94, and the flange portion 95 of the piston 77.

  Next, after extending the flexible portion 116C from the fitting portion 115 to the opposite side with respect to the flange portion 92, the flexible portion 116C is folded back to the outside in the cylinder radial direction so as to extend to the flange portion 92 side. Is fitted in the fitting groove 167C of the piston contact member 130C attached in advance.

  Then, the return spring 76 (see FIG. 4) is inserted into the cylinder hole 47B, and the piston 77 in a state where the cup seal 78 (see FIG. 4), the cup seal 79, and the boot 80C including the piston contact member 130C are assembled in advance. Is inserted into the cylinder hole 47B. The piston 77 and the piston contact member 130C are pushed in by a predetermined amount by the jig, and the piston contact member 130C is positioned at a predetermined position opposite to the opening 48 of the radial hole 58B. At this time, the end surface 163Ca of the piston abutting member 130C may be abutted against the bottom surface 53c of the mouth hole portion 53B for positioning.

  With the piston contact member 130C positioned in the cylinder axial direction with respect to the mouth hole portion 53B, the brake switch 29B is disposed on the mounting seat 54B, and the screw shaft portion 106B of the mounting screw member 30B is screwed into the radial hole 58B. The brake switch 29B is fixed to the cylinder 37B.

  Then, the diameter-reduced outer peripheral surface 106Ba of the mounting screw member 30B overlaps the diameter-reduced outer peripheral surface 166Ca of the tapered cylindrical portion 166C of the piston abutting member 130C and overlaps the position in the cylinder radial direction toward the opening 48 in the cylinder axial direction. Adjacent state. As a result, the mounting screw member 30B has the reduced diameter outer peripheral surface 106Ba abuts on the reduced diameter outer peripheral surface 166Ca of the tapered cylindrical portion 166C of the piston abutting member 130C, so that the piston abutting member 130C is removed from the cylinder 37B. The movement will be restricted.

  The piston abutting member 130C in a state in which the movement of the mounting screw member 30B in the removal direction from the cylinder 37B is regulated in such a manner that the end surface 92c of the flange portion 92 abuts the end surface 163Ca over the entire circumference. The movement of the piston 77 in the direction of coming out of the cylinder hole 47B is restricted. The position where the flange 92 is brought into contact with the piston contact member 130C which is in contact with the mounting screw member 30B is the standby position of the piston 77 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 cylindrical portion 166C of the piston contact member 130C may be pressed by the reduced diameter outer peripheral surface 106Ba of the mounting screw member 30B. Then, by this pressing, the end surface 163Ca of the piston contact member 130C may be pressed against the bottom surface 53c of the mouth hole 53B, and the outer peripheral surface 165Ca may be pressed against the inner peripheral surface 53Ba of the mouth hole 53B. In this way, when the mounting screw member 30B fixes the brake switch 29B to the cylinder 37B, the piston contact member 130C is also positioned relative to the cylinder 37B and fixed so as not to move.

  The piston abutting member 130 </ b> C may not be an annular shape as long as it is a member extending in the circumferential direction of the cylinder 37 </ b> B. Also, the piston abutting member 130C is provided with a portion extending from the tapered cylindrical portion 166C while expanding in the opposite direction to the end plate portion 163C, and the end portion of the inside of the cylinder of the boot body is fitted on the outer peripheral side of this portion. You may make it match.

According to the fourth embodiment described above, the piston contact member 130C holds the other side of the boot main body 81C that is held by the piston 77 and covers the opening 48 side of the cylinder 37B. For this reason, the other side of the boot body 81C can be attached to the cylinder 37B by attaching the piston contact member 130C to the cylinder 37B with the attachment screw member 30B. Therefore, the boot body 81C can satisfactorily protect the opening 48 side of the cylinder 37B.
In addition, since the rigid piston contact member 130C maintains the shape of the other side of the boot body 81C, a rigid ring is not necessary.

In the above embodiment, in a vehicular master cylinder having a piston propelled by operation of an operator and a cylinder in which the piston is movably provided, the cylinder has a radial hole formed in the cylinder. And a movement restricting member that restricts movement of the piston relative to the cylinder is provided, and the movement restricting member fixes a detection member that detects an operation of the operation element to the cylinder.
Thereby, since the movement of the piston is regulated by the movement regulating member for fixing the detection member to the cylinder, an increase in the number of components can be suppressed. Therefore, the manufacturing efficiency of the vehicle master cylinder can be improved. Moreover, the increase in component cost and assembly cost can be suppressed. Furthermore, since a necessary radial hole for attaching the movement restricting member is used, an increase in processing cost can be suppressed.

  The movement restricting member restricts the movement of the piston via a piston abutting member disposed in the cylinder and abutting on the piston. This makes it easier to increase the area of the portion that comes into contact with the piston when the movement is restricted, compared to the case where the movement is restricted by directly abutting with the movement regulating member. Thereby, the damage of a piston can be suppressed and the reliability as a product improves.

  The piston abutting member is a circumferential member (annular or C-shaped) that extends in the circumferential direction of the cylinder. One end of the piston abutting member abuts on the piston, and the movement restricting member An inclined portion that extends toward the other end side of the piston contact member and inward in the cylinder radial direction is formed in the pressed portion. Thereby, even if the position of the movement restricting member is slightly shifted in the radial direction in the radial hole, the piston abutting member can be prevented from moving beyond the movement restricting member.

The piston abutting member holds one side of the flexible protective member that is held by the piston and covers the opening side of the cylinder. For this reason, the other side of the flexible protection member can be attached to the cylinder by attaching the piston contact member to the cylinder with the movement restricting member.
Therefore, the opening side of the cylinder can be well protected by the flexible protection member.

  According to the vehicle master cylinder described above, the manufacturing efficiency is improved.

11, 11A, 11B, 11C Vehicle master cylinder 23 Brake lever (operator)
29, 29B Brake switch (detection member)
30, 30A, 30B Mounting screw member (movement restriction member)
37, 37B Cylinder 48 Opening 58, 58B Radial direction hole 77 Piston 81C Boot body (flexible protective member)
130A, 130B, 130C Piston contact member (circumferential member)
131B Inclined portion 166C Tapered tube portion (inclined portion)

Claims (6)

A piston propelled by operation of the operator,
A cylinder in which the piston is movably provided;
With
The cylinder is provided with a movement restricting member that is inserted into a radial hole formed in the cylinder and restricts the movement of the piston with respect to the cylinder.
The movement restricting member fixes a detection member that detects an operation of the operation element to the cylinder. The cylinder is provided integrally with the cylinder body member together with a support portion to which the operation element is attached and a reservoir in which brake fluid is stored.
The vehicular master cylinder according to claim 1, wherein the movement restriction member is a screw member that fixes the detection member to the cylinder body member. The vehicular master cylinder according to claim 2, wherein a tip end side of the screw member is disposed so as to be able to contact the piston and restricts movement of the piston. The vehicular master cylinder according to claim 1, wherein the movement restricting member restricts movement of the piston via a piston abutting member disposed in the cylinder and abutting against the piston. The piston abutting member is a circumferential member extending in the circumferential direction of the cylinder, and one end side of the piston abutting member abuts on the piston, and a portion pressed by the movement restricting member includes the piston The vehicular master cylinder according to claim 4, wherein an inclined portion that extends toward the other end side of the contact member and inward in the radial direction is formed. The vehicular master cylinder according to claim 4, wherein one side of the piston abutting member is held by the piston and holds the other side of the flexible protection member that covers the opening side of the cylinder.

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