WO2019230400A1 - Master cylinder - Google Patents
Master cylinder Download PDFInfo
- Publication number
- WO2019230400A1 WO2019230400A1 PCT/JP2019/019319 JP2019019319W WO2019230400A1 WO 2019230400 A1 WO2019230400 A1 WO 2019230400A1 JP 2019019319 W JP2019019319 W JP 2019019319W WO 2019230400 A1 WO2019230400 A1 WO 2019230400A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cylinder
- outer peripheral
- groove
- peripheral lip
- inner peripheral
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/16—Master control, e.g. master cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
Definitions
- the present invention relates to a master cylinder that supplies hydraulic pressure to a brake cylinder of a vehicle.
- This application claims priority on May 29, 2018 based on Japanese Patent Application No. 2018-102318 for which it applied to Japan, and uses the content for it here.
- Some master cylinders are provided with a seal for defining a replenishment path communicating with a reservoir and the outside of the cylinder body in a circumferential groove of the cylinder body (see, for example, Patent Document 1).
- the present invention provides a master cylinder capable of improving quality.
- the master cylinder is disposed in a circumferential groove formed by opening in the inner peripheral surface of the cylinder body, and the inner periphery is in sliding contact with the piston, With a seal that defines The seal includes an inner peripheral lip portion that protrudes from an annular base portion and slidably contacts the outer peripheral surface of the piston, and an outer peripheral lip portion that contacts the peripheral groove of the cylinder body.
- the outer peripheral lip portion is formed with a passage communicating with the inner peripheral side and the outer peripheral side of the outer peripheral lip portion at the distal end portion.
- the quality can be improved.
- a first embodiment according to the present invention will be described with reference to FIGS.
- a force corresponding to an operation amount of a brake pedal (not shown) is introduced through an output shaft of a brake booster (not shown).
- the master cylinder 11 generates a brake fluid pressure corresponding to the operation amount of the brake pedal.
- a reservoir 12 (only a part of which is shown in FIG. 1) for supplying and discharging brake fluid to / from the master cylinder 11 is attached to the master cylinder 11 on the upper side in the vertical direction.
- the reservoir 12 is directly attached to the master cylinder 11, but the reservoir may be disposed at a position separated from the master cylinder 11, and the reservoir and the master cylinder 11 may be connected by piping. .
- the master cylinder 11 has a cylinder body 15 made of metal that is formed by processing a single material into a bottomed cylinder having a bottom 13 and a cylinder 14.
- the cylinder body 15 has an opening 16 on one side in the axial direction and a bottom 13 on the other side in the axial direction.
- a metal primary piston 18 (piston) is movably disposed on the opening 16 side in the cylinder body 15 so as to partially protrude from the cylinder body 15.
- a metal secondary piston 19 is movably disposed on the bottom 13 side of the primary piston 18 in the cylinder body 15.
- An inner peripheral hole 21 having a bottom surface is formed in the primary piston 18.
- the secondary piston 19 has an inner peripheral hole 22 having a bottom surface.
- the master cylinder 11 is a so-called plunger type.
- the master cylinder 11 is a tandem type master cylinder having two primary pistons 18 and secondary pistons 19 as described above.
- the present invention is not limited to the application to the tandem type master cylinder, and if it is a plunger type master cylinder, a single type master cylinder in which one piston is arranged in the cylinder body, or three or more types.
- the present invention can be applied to any plunger type master cylinder such as a master cylinder having a plurality of pistons.
- the cylinder body 15 has a mounting base portion 23 protruding outward in the radial direction of the cylindrical portion 14 (hereinafter referred to as the cylinder radial direction), and in the circumferential direction of the cylindrical portion 14 (hereinafter referred to as the cylinder circumferential direction). Are integrally formed at predetermined positions.
- the mounting base 23 is formed with mounting holes 24 and mounting holes 25 for mounting the reservoir 12.
- the mounting hole 24 and the mounting hole 25 are positioned in the axial direction (hereinafter referred to as the cylinder axis) of the cylinder portion 14 of the cylinder body 15 in a state where the positions in the cylinder circumferential direction coincide with each other. Is formed at the upper part of the cylinder body 15 in the vertical direction.
- the cylinder body 15 is disposed in the vehicle in such a posture that the axial direction of the cylindrical portion 14 (hereinafter referred to as the cylinder axial direction) is along the vehicle longitudinal direction.
- the opening 16 side of the cylinder body 15 in the cylinder axial direction is referred to as a cylinder opening side
- the bottom 13 side of the cylinder body 15 in the cylinder axial direction is referred to as a cylinder bottom side.
- a secondary discharge path 26 that is a brake fluid discharge path is formed in the vicinity of the bottom 13 in the cylinder axis direction on the mounting base 23 side of the cylinder portion 14 of the cylinder body 15. Further, a primary discharge path 27 (discharge path) that is a brake liquid discharge path is formed on the cylinder opening side of the cylinder body 15 with respect to the secondary discharge path 26.
- the cylinder body 15 has a secondary discharge path 26 and a primary discharge path 27, both of which are brake fluid discharge paths.
- the secondary discharge path 26 and the primary discharge path 27 communicate with a brake cylinder such as a disc brake or a drum brake via a brake pipe, and discharge brake fluid toward the brake cylinder.
- the secondary discharge path 26 and the primary discharge path 27 are formed so that the positions in the cylinder axial direction are shifted in a state where the positions in the cylinder circumferential direction coincide with each other.
- a sliding inner diameter portion 28 is formed on the inner peripheral portion of the cylinder portion 14 of the cylinder body 15 on the cylinder bottom side.
- the sliding inner diameter portion 28 protrudes inward in the cylinder radial direction from the inner peripheral portion of the cylindrical portion 14 on both sides in the cylinder axial direction.
- the sliding inner diameter portion 28 has an annular shape in the cylinder circumferential direction.
- the secondary piston 19 is slidably fitted to the minimum inner diameter surface 28 a of the sliding inner diameter portion 28.
- the secondary piston 19 is guided by the minimum inner diameter surface 28a and moves in the cylinder axial direction.
- a sliding inner diameter portion 29 is formed on an inner peripheral portion of the cylinder portion 14 of the cylinder body 15 on the cylinder opening side.
- the sliding inner diameter portion 29 protrudes inward in the cylinder radial direction from the inner peripheral portion of the cylinder portion 14 on the cylinder bottom side.
- the sliding inner diameter portion 29 has an annular shape in the cylinder circumferential direction.
- the primary piston 18 is slidably fitted to the minimum inner diameter surface 29 a of the sliding inner diameter portion 29.
- the primary piston 18 is guided by the minimum inner diameter surface 29a and moves in the cylinder axis direction.
- the sliding inner diameter portion 28 is formed with a circumferential groove 30 and a circumferential groove 31 that are formed in this order from the bottom side of the cylinder in a plurality of positions, in the cylinder axial direction, in a plurality of shapes, specifically in any two places.
- the sliding inner diameter portion 29 is also formed with a circumferential groove 32 and a circumferential groove 33 that are formed in this order from the cylinder bottom side by shifting the position in the cylinder axial direction and forming a plurality of, specifically, two of them in an annular shape. .
- the circumferential grooves 30 and 31 have an annular shape in the cylinder circumferential direction and have a shape that is recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a constituting the inner circumferential surface 15a of the cylinder body 15.
- the circumferential grooves 32 and 33 have an annular shape in the cylinder circumferential direction and have a shape that is recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a constituting the inner circumferential surface 15a of the cylinder body 15.
- the cylinder opening side from the circumferential groove 33 is an opening-side inner diameter surface 16 a that constitutes the inner circumferential surface 15 a of the cylinder body 15.
- the circumferential groove 33 has a shape that is recessed outward in the cylinder radial direction from the opening-side inner diameter surface 16a.
- the opening side inner diameter surface 16a is slightly larger in diameter than the minimum inner diameter surface 29a.
- the circumferential grooves 30 to 33 are formed in the cylinder body 15 so as to open to the inner circumferential surface 15 a of the cylinder body 15. All of the circumferential grooves 30 to 33 are formed by cutting.
- the circumferential groove 30 closest to the cylinder bottom is formed in the vicinity of the mounting hole 24 on the cylinder bottom side of the mounting hole 24 and the mounting hole 25.
- An annular piston seal 35 is disposed in the circumferential groove 30 so as to be held in the circumferential groove 30.
- An annular opening groove 37 is formed on the cylinder opening side of the sliding inner diameter portion 28 of the cylinder body 15 on the cylinder opening side, and is recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a.
- the opening groove 37 opens a communication hole 36 drilled from the mounting hole 24 on the cylinder bottom side into the cylindrical portion 14.
- the opening groove 37 and the communication hole 36 constitute a secondary supply path 38 provided in the cylinder body 15 and always communicating with the reservoir 12.
- the cylinder body 15 has a secondary supply path 38 that communicates with the reservoir 12.
- a communication groove 41 that opens to the circumferential groove 30 on the cylinder bottom side of the sliding inner diameter portion 28 of the cylinder body 15 and extends linearly from the circumferential groove 30 toward the cylinder bottom side in the cylinder axial direction. However, it is formed so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a.
- the communication groove 41 communicates the secondary discharge passage 26 and the circumferential groove 30 formed at a position between the bottom portion 13 and the circumferential groove 30 and in the vicinity of the bottom portion 13 via a secondary pressure chamber 68 described later. .
- the circumferential groove 31 is formed on the side opposite to the circumferential groove 30 of the opening groove 37 in the cylinder axial direction, that is, on the cylinder opening side.
- An annular partition seal 42 is disposed in the circumferential groove 31 so as to be held in the circumferential groove 31.
- the above-mentioned circumferential groove 32 is formed in the sliding inner diameter portion 29 of the cylinder body 15 in the vicinity of the mounting hole 25 on the cylinder opening side.
- An annular piston seal 45 is disposed in the circumferential groove 32 so as to be held in the circumferential groove 32.
- An annular opening groove 47 is formed on the cylinder opening side of the circumferential groove 32 in the sliding inner diameter portion 29 of the cylinder body 15 so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a.
- the opening groove 47 opens a communication hole 46 formed in the cylinder opening 14 from the mounting hole 25 on the cylinder opening side.
- the opening groove 47 and the communication hole 46 mainly constitute a primary supply path 48 (supply path) provided in the cylinder body 15 and always communicating with the reservoir 12.
- the cylinder body 15 has a primary supply path 48 that communicates with the reservoir 12.
- a communication groove 51 that opens to the circumferential groove 32 on the cylinder bottom side of the sliding inner diameter portion 29 of the cylinder body 15 and extends linearly from the circumferential groove 32 toward the cylinder bottom side in the cylinder axial direction. However, it is formed so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a.
- the communication groove 51 has a primary discharge passage 27 formed between the circumferential groove 31 and the circumferential groove 32 and in the vicinity of the circumferential groove 31, and the circumferential groove 32 via a primary pressure chamber 85 described later. Communicate.
- a circumferential groove 33 is formed in the sliding inner diameter portion 29 of the cylinder body 15 on the side opposite to the circumferential groove 32 of the opening groove 47, that is, on the cylinder opening side.
- An annular partition seal 52 (seal) is disposed in the circumferential groove 33 so as to be held in the circumferential groove 33.
- the secondary piston 19 disposed on the cylinder bottom side of the cylinder body 15 includes a first cylindrical portion 55, a bottom portion 56 formed on one side in the axial direction of the first cylindrical portion 55, and a first cylinder of the bottom portion 56. It has the shape which has the 2nd cylindrical part 57 formed in the opposite side to the shape part 55. FIG.
- the inner peripheral hole 22 is formed by the first cylindrical portion 55 and the bottom portion 56 among these.
- the secondary piston 19 has an inner circumference of each of the piston seal 35 and the partition seal 42 provided on the sliding inner diameter portion 28 of the cylinder body 15 in a state where the first cylindrical portion 55 is disposed on the cylinder bottom side of the cylinder body 15. And is slidably fitted.
- annular concave portion 59 that is recessed radially inward from the largest outer diameter surface 19 a having the largest diameter on the outer peripheral surface 19 z of the secondary piston 19. Is formed.
- a plurality of ports 60 penetrating in the cylinder radial direction are formed on the bottom 56 side so as to be radially arranged at equal intervals in the cylinder circumferential direction.
- an interval adjusting portion 63 including a secondary piston spring 62 that determines the interval in a non-braking state in which there is no input from an output shaft of a brake booster (not shown).
- the interval adjusting portion 63 is connected to the locking member 64 that contacts the bottom portion 13 of the cylinder body 15 and the locking member 64 so as to slide only within a predetermined range, and contacts the bottom portion 56 of the secondary piston 19.
- a locking member 65 The secondary piston spring 62 is interposed between the locking member 64 and the locking member 65.
- a portion formed by being surrounded by the bottom 13 of the cylinder body 15 and the cylinder bottom side of the cylinder portion 14 and the secondary piston 19 generates a brake fluid pressure and supplies the brake fluid pressure to the secondary discharge passage 26. 68.
- the secondary piston 19 forms a secondary pressure chamber 68 that supplies hydraulic pressure to the secondary discharge passage 26 between the secondary piston 19 and the cylinder body 15.
- the secondary pressure chamber 68 communicates with the secondary supply path 38, that is, the reservoir 12 when the secondary piston 19 is in a position for opening the port 60 to the secondary supply path 38.
- the partition seal 42 disposed and held in the circumferential groove 31 of the cylinder body 15 is an integrally molded product made of synthetic rubber.
- the section seal 42 has a C-shape in which one side of the cross section on the plane including the center line is open to the cylinder opening side.
- the partition seal 42 is in sliding contact with the outer peripheral surface 19z of the secondary piston 19 moving in the cylinder axial direction, and the outer periphery is in contact with the peripheral groove 31 of the cylinder body 15.
- the partition seal 42 always seals the gap between the secondary piston 19 and the partition seal 42 of the cylinder body 15.
- the piston seal 35 disposed and held in the circumferential groove 30 of the cylinder body 15 is an integrally molded product made of synthetic rubber.
- the piston seal 35 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side.
- the inner periphery of the piston seal 35 is in sliding contact with the outer peripheral surface 19z of the secondary piston 19 that moves in the cylinder axial direction. Further, the outer periphery of the piston seal 35 abuts on the circumferential groove 30 of the cylinder body 15.
- the piston seal 35 provided in the circumferential groove 30 can seal between the secondary supply passage 38 and the secondary pressure chamber 68 when the secondary piston 19 positions the port 60 on the cylinder bottom side of the piston seal 35. It has become.
- the piston seal 35 can be sealed by blocking communication between the secondary pressure chamber 68 and the secondary supply path 38 and the reservoir 12.
- the secondary piston 19 slides on the sliding inner diameter portion 28 of the cylinder body 15 and the inner periphery of the piston seal 35 and the partition seal 42 held by the cylinder body 15 and moves to the cylinder bottom side.
- the brake fluid in the secondary pressure chamber 68 is pressurized.
- the brake fluid pressurized in the secondary pressure chamber 68 is supplied from the secondary discharge passage 26 to the brake cylinder on the wheel side.
- the primary piston 18 disposed on the cylinder opening side of the cylinder body 15 includes a first cylindrical portion 71, a bottom portion 72 formed on one side in the axial direction of the first cylindrical portion 71, and a first cylinder of the bottom portion 72.
- the shape which has the 2nd cylindrical part 73 formed in the opposite side to the shape part 71 is comprised.
- the inner peripheral hole 21 is formed by the first cylindrical portion 71 and the bottom portion 72 among them.
- the primary piston 18 has the first cylindrical portion 71 disposed on the secondary piston 19 side in the cylinder body 15 and each of the piston seal 45 and the partition seal 52 provided on the sliding inner diameter portion 29 of the cylinder body 15.
- the inner periphery is slidably fitted.
- an output shaft of a brake booster (not shown) is inserted inside the second cylindrical portion 73. By this output shaft, the bottom 72 is pressed toward the bottom of the cylinder.
- annular concave portion 75 that is recessed radially inward from the largest outer diameter surface 18 a having the largest diameter on the outer peripheral surface 18 z of the primary piston 18. Is formed.
- the recess 75 is formed with a plurality of ports 76 penetrating in the radial direction on the bottom 72 side so as to be radially arranged at equal intervals in the cylinder circumferential direction.
- an interval adjusting portion 79 including a primary piston spring 78 that determines these intervals in a non-braking state without input from an output shaft of a brake booster (not shown).
- the gap adjusting portion 79 includes a locking member 81 that contacts the bottom 72 of the primary piston 18, a locking member 82 that contacts the bottom 56 of the secondary piston 19, and one end fixed to the locking member 81. And a shaft member 83 that slidably supports the stop member 82 only within a predetermined range.
- the primary piston spring 78 is interposed between the locking member 81 and the locking member 82.
- a portion of the cylinder body 15 surrounded by the cylindrical portion 14, the primary piston 18 and the secondary piston 19 generates a primary pressure chamber 85 (pressure chamber) that generates brake fluid pressure and supplies brake fluid to the primary discharge passage 27. ).
- the primary piston 18 forms a primary pressure chamber 85 that supplies hydraulic pressure to the primary discharge passage 27 between the secondary piston 19 and the cylinder body 15.
- the primary pressure chamber 85 communicates with the primary supply path 48, that is, the reservoir 12 when the primary piston 18 is in a position to open the port 76 to the primary supply path 48.
- the partition seal 52 arranged and held in the circumferential groove 33 of the cylinder body 15 is an integrally molded product made of synthetic rubber.
- the section seal 52 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side.
- the partition seal 52 is in sliding contact with the outer peripheral surface 18z of the primary piston 18 moving in the cylinder axial direction, and the outer periphery is in contact with the peripheral groove 33 of the cylinder body 15. Thereby, the partition seal 52 always seals the gap between the primary piston 18 and the position of the partition seal 52 of the cylinder body 15.
- the partition seal 52 defines the primary supply path 48 and the outside of the cylinder body 15, that is, the outside of the master cylinder 11.
- the piston seal 45 disposed and held in the circumferential groove 32 of the cylinder body 15 is an integrally molded product made of synthetic rubber.
- the piston seal 45 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side.
- the inner periphery of the piston seal 45 is in sliding contact with the outer peripheral surface 18z of the primary piston 18 that moves in the cylinder axial direction.
- the outer periphery of the piston seal 45 abuts on the circumferential groove 32 of the cylinder body 15.
- the piston seal 45 provided in the circumferential groove 32 can seal between the primary supply passage 48 and the primary pressure chamber 85 when the primary piston 18 has the port 76 positioned on the cylinder bottom side of the piston seal 45. is there.
- the piston seal 45 can be sealed by blocking communication between the primary pressure chamber 85 and the primary supply path 48 and the reservoir 12.
- the primary piston 18 slides on the sliding inner diameter portion 29 of the cylinder body 15 and the inner periphery of the piston seal 45 and the partition seal 52 held by the cylinder body 15 and moves to the cylinder bottom side.
- the brake fluid in the primary pressure chamber 85 is pressurized.
- the brake fluid pressurized in the primary pressure chamber 85 is supplied from the primary discharge path 27 to the brake cylinder on the wheel side.
- the circumferential groove 33 that is recessed outward in the cylinder radial direction from the opening-side inner diameter surface 16a and the minimum inner diameter surface 29a is a groove opening 87 (opening) at the position of the opening-side inner diameter surface 16a and the minimum inner diameter surface 29a.
- the circumferential groove 33 has a groove bottom 88 on the inner side in the recess direction, that is, on the outer side in the cylinder radial direction.
- the circumferential groove 33 has a wall portion 89 that spreads inwardly in the cylinder radial direction from the end portion of the groove bottom 88 on the cylinder opening side.
- the circumferential groove 33 has a wall portion 90 that extends inwardly in the cylinder radial direction from an end edge portion of the groove bottom 88 on the cylinder bottom side.
- the groove bottom 88, the wall 89, and the wall 90 are formed in the cylinder body 15 itself.
- the groove bottom 88, the wall 89 and the wall 90 are formed by cutting the cylinder body 15.
- the groove bottom 88 has a groove bottom surface portion 88a.
- the groove bottom surface portion 88a is a cylindrical surface centered on the cylinder axis, and the length in the cylinder axis direction is constant over the entire circumference in the cylinder circumferential direction.
- the wall 89 on the cylinder opening side of the circumferential groove 33 has a wall surface 89a.
- the wall surface portion 89a extends inward in the cylinder radial direction from the cylinder opening side of the groove bottom 88.
- the wall surface portion 89a is a flat surface parallel to the orthogonal surface of the cylinder axis.
- the wall surface portion 89a has a constant inner diameter, a constant outer diameter, and a constant width in the cylinder radial direction over the entire circumference in the cylinder circumferential direction, and has an annular shape centering on the cylinder shaft.
- the edge on the large diameter side of the wall surface 89a and the edge on the cylinder opening side of the groove bottom 88a are connected by an R chamfer 89b.
- the wall portion 90 on the cylinder bottom side of the circumferential groove 33 faces the wall portion 89 in the cylinder axial direction.
- the wall part 90 has a wall surface part 90a and a slope part 90b.
- the wall surface portion 90a extends inward in the cylinder radial direction from the cylinder bottom side of the groove bottom 88.
- the wall surface portion 90a is a flat surface parallel to the orthogonal surface of the cylinder axis.
- the wall surface portion 90a has a constant inner diameter, a constant outer diameter, and a constant width in the cylinder radial direction over the entire circumference in the cylinder circumferential direction, and has an annular shape centering on the cylinder axis.
- the inclined surface portion 90b extends from the inner end edge of the wall surface portion 90a in the cylinder radial direction inwardly in the cylinder radial direction so as to be inclined with respect to the cylinder radial direction so as to be located on the cylinder bottom side toward the inner side in the cylinder radial direction. Yes. In other words, the inclined surface portion 90b extends from the inner end edge portion of the wall surface portion 90a in the cylinder radial direction to the cylinder bottom side so as to decrease in diameter toward the cylinder bottom side.
- the inclined surface portion 90b has a constant inner diameter, a constant outer diameter, a constant width in the cylinder radial direction, and a constant length in the cylinder axial direction over the entire circumference in the cylinder circumferential direction.
- the edge on the large diameter side of the wall surface portion 90a and the edge on the cylinder bottom side of the groove bottom surface portion 88a are connected by an R chamfer 90c.
- the edge portion on the small diameter side of the slope portion 90b and the minimum inner diameter surface 29a of the sliding inner diameter portion 29 are connected by an R chamfer 90d.
- the circumferential groove 33 is inclined with respect to the cylinder radial direction so that the sloped portion 90b on the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter toward the cylinder opening side in the cylinder axial direction.
- the partition seal 52 disposed in the circumferential groove 33 has a base 101, an inner peripheral lip 102, and an outer peripheral lip 103.
- the base 101 is disposed on the cylinder opening side of the partition seal 52.
- the base 101 has an annular plate shape parallel to the axis orthogonal plane of the partition seal 52.
- the inner peripheral lip 102 has an annular cylindrical shape that protrudes from the inner peripheral edge of the base 101 toward the cylinder bottom along the cylinder axial direction.
- the outer peripheral lip 103 has an annular cylindrical shape that protrudes from the outer peripheral edge of the base 101 toward the cylinder bottom along the cylinder axial direction.
- the section seal 52 has a cross-sectional one-side shape on a plane including the center line in a natural state before being assembled in the master cylinder 11 as shown in FIG.
- the partition seal 52 in the natural state will be described with reference to FIGS.
- the base 101 has an end surface 101 a opposite to the inner peripheral lip 102 and the outer peripheral lip 103 having a substantially flat shape, a constant inner diameter, a constant outer diameter, and a constant width in the radial direction. It has an annular shape.
- the base 101 includes a cylindrical outer peripheral surface 101b, an R chamfer 101c connecting the outer peripheral edge of the end surface 101a and the outer peripheral surface 101b, a cylindrical inner peripheral surface 101d, and an inner peripheral edge of the end surface 101a.
- R chamfer 101e that connects the portion and the inner peripheral surface 101d.
- a tapered proximal end outer peripheral surface 102a is formed on the axial base portion 101 side, and a cylindrical surface distal end side is opposite to the base portion 101 of the proximal end outer peripheral surface 102a.
- Each outer peripheral surface 102b is formed.
- the proximal outer peripheral surface 102a has a smaller diameter as it is separated from the base 101 in the axial direction.
- the inner end of the tapered base end extending from the end edge of the inner peripheral surface 101 d of the base 101 opposite to the R chamfer 101 e on the base 101 side in the axial direction.
- a peripheral surface 102c is formed.
- a tapered intermediate inner peripheral surface 102d is formed on the inner side in the radial direction of the inner peripheral lip portion 102 on the side opposite to the base 101 of the base end side inner peripheral surface 102c.
- a cylindrical surface-like tip side inner peripheral surface 102e is formed on the opposite side.
- the proximal end inner peripheral surface 102c has a smaller diameter as it is separated from the base 101 in the axial direction.
- middle inner peripheral surfaces are large diameter, so that it leaves
- the front end face 102f has a substantially flat shape, and has a constant inner diameter and a constant outer diameter and a constant width in the radial direction.
- the distal end portion 111 including the entire distal end surface 102f, the distal end side outer peripheral surface 102b and the distal end side inner peripheral surface 102e of the inner peripheral lip portion 102 has a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102.
- a plurality of radial grooves 112 are formed at intervals in the circumferential direction. Specifically, four radial grooves 112 are formed at equal intervals in the circumferential direction of the inner peripheral lip portion 102 as shown in FIG. As shown in FIG. 3, the radial groove 112 continuously opens to the distal end side outer peripheral surface 102b, the distal end surface 102f, and the distal end side inner peripheral surface 102e, and crosses the distal end surface 102f in the radial direction.
- a tapered base end inner peripheral surface 103a is formed on the axial base portion 101 side on the radially inner side of the outer peripheral lip portion 103, and a cylinder is formed on the side opposite to the base portion 101 of the base end inner peripheral surface 103a.
- a planar tip-side inner peripheral surface 103b is formed.
- the proximal end inner circumferential surface 103a has a larger diameter as it is separated from the base 101 in the axial direction.
- a tapered base outer peripheral surface 103c extending from the end edge of the outer peripheral surface 101b of the base 101 opposite to the R chamfer 101c. Is formed.
- a tapered distal outer peripheral surface 103d is formed on the side opposite to the base 101 of the proximal outer peripheral surface 103c.
- the proximal outer peripheral surface 103c has a larger diameter as it is separated from the base 101 in the axial direction.
- the distal outer circumferential surface 103d has a smaller diameter as it is separated from the proximal outer circumferential surface 103c in the axial direction.
- a leading end surface 103e is formed by tying.
- the distal end surface 103e has a substantially flat shape, and has a constant inner diameter, a constant outer diameter, and a constant width in the radial direction.
- the distal end portion 121 including the entire distal end surface 103e, distal end side inner peripheral surface 103b, and distal end side outer peripheral surface 103d of the outer peripheral lip portion 103 has a diameter serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip portion 103.
- a plurality of directional grooves 122 (passages) are formed at intervals in the circumferential direction. Specifically, four radial grooves 122 are formed at equal intervals in the circumferential direction of the outer peripheral lip 103 as shown in FIG. That is, the number of radial grooves 122 of the outer peripheral lip 103 is the same as the number of radial grooves 112 of the inner peripheral lip 102.
- the radial groove 122 opens continuously to the distal end inner peripheral surface 103b, the distal end surface 103e, and the distal end side outer peripheral surface 103d, and crosses the distal end surface 103e in the radial direction.
- each of the plurality of radial grooves 122 is in one-to-one correspondence with the radial groove 112 of the inner peripheral lip portion 102 and matches the circumferential position, that is, the phase of the partition seal 52.
- the partition seal 52 has a circumferential position of the radial groove 112 formed at the distal end portion 111 of the inner peripheral lip portion 102 and a circumferential direction of the radial groove 122 formed at the distal end portion 121 of the outer peripheral lip portion 103. The position overlaps.
- a partition seal 52 having the above shape in a natural state is disposed in the circumferential groove 33 as shown in FIG. 2, and the primary piston 18 is fitted inside the partition seal 52.
- the outer peripheral lip portion 103 abuts against the groove bottom surface portion 88a of the groove bottom 88 with a margin
- the inner peripheral lip portion 102 is the maximum outer diameter surface 18a of the outer peripheral surface 18z of the primary piston 18. Fit with a tight margin.
- the partition seal 52 comes into contact with the groove bottom surface 88a of the circumferential groove 33 at the outer peripheral surface 101b of the base 101 and the proximal end outer peripheral surface 103c of the outer peripheral lip 103, and the outer peripheral surface of the distal end side of the outer peripheral lip 103 103 d extends away from the groove bottom surface portion 88 a of the circumferential groove 33 in the radial direction toward the side opposite to the base portion 101.
- the partition seal 52 basically abuts the outer peripheral surface 18z of the primary piston 18 at the proximal inner peripheral surface 102c and the intermediate inner peripheral surface 102d of the inner peripheral lip portion 102, so The peripheral surface 102e is separated from the outer peripheral surface 18z of the primary piston 18 in the radial direction. Further, in this state, in the partition seal 52, the front end side inner peripheral surface 103b of the outer peripheral lip portion 103 and the front end side outer peripheral surface 102b of the inner peripheral lip portion 102 are separated in the radial direction.
- the inner peripheral lip portion 102 is in sliding contact with the outer peripheral surface 18 z of the primary piston 18, and the outer peripheral lip portion 103 is in contact with the groove bottom surface portion 88 a of the peripheral groove 33 of the cylinder body 15.
- the circumferential groove 33 is in the cylinder radial direction, that is, in the radial direction of the primary piston 18 so that the sloped portion 90b on the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter as it approaches the partition seal 52 in the cylinder axial direction. It is inclined with respect to. Further, the circumferential groove 33 has a wall surface portion 90a on the groove bottom 88 side of the wall portion 90 that faces the outer circumferential lip portion 103 of the partition seal 52 in the radial direction so as to face the axial direction. The portion 90b is opposed to the inner circumferential lip portion 102 of the partition seal 52 in the axial direction with the radial position overlapped.
- FIG. 1 shows a basic state (non-braking state before the brake pedal is operated) of the master cylinder 11 in which there is no input from the output shaft side of a brake booster (not shown).
- the primary piston 18 allows the port 76 to communicate with the primary supply path 48.
- the secondary piston 19 makes the port 60 communicate with the secondary supply path 38.
- the master cylinder described in Patent Document 1 described above is provided with a seal in the circumferential groove of the cylinder body for defining a replenishment path communicating with the reservoir and the outside of the cylinder body.
- the seal has a C-shaped one-sided cross section on the surface including the center line, and slidably contacts the primary piston at the inner peripheral lip portion and contacts the peripheral groove of the cylinder body at the outer peripheral lip portion.
- the sealability of each part is inspected in the assembled state, but the sealability of the partition seal 52 is also inspected.
- evacuation is performed from either one of the primary replenishment path 48 and the primary discharge path 27 while the other is closed.
- the inside of the primary pressure chamber 85 is in a predetermined negative pressure state, for example, a state in which a pressure equal to or lower than a predetermined value is maintained for a predetermined time, it is determined that the sealing performance of the partition seal 52 is good, and the predetermined negative pressure state is reached. If not, it is determined that the sealing performance of the partition seal 52 is poor.
- foreign matter F is mixed between the groove bottom 88 of the circumferential groove 33 and the outer peripheral lip 103 of the partition seal 52 as shown in FIG. .
- the foreign matter F is, for example, chips generated when the cylinder body 15 is cut.
- the foreign matter F mixed in this way forms a gap where the outer peripheral lip 103 of the partition seal 52 and the groove bottom 88 do not adhere to each other at least on both sides of the foreign matter F in the circumferential direction of the circumferential groove 33 and the partition seal 52. Therefore, at the time of inspection, air flows from the opening 16 side of the cylinder body 15 to the evacuated primary pressure chamber 85 through this gap, and the primary pressure chamber 85 does not enter a predetermined negative pressure state. By detecting this, it is possible to detect a poor sealing performance of the partition seal 52.
- the partition seal 52 is sucked toward the primary replenishment path 48 and moves to the wall 90 side in the circumferential groove 33 as shown in FIG. It may abut against the portion 90a.
- the front end 121 ′ of the outer peripheral lip 103 ′ is not formed with a passage that connects the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 ′.
- the tip 121 ′ of the outer peripheral lip 103 ′ can be in close contact with the wall surface 90a of the wall 90 over the entire circumference.
- the radial direction becomes a passage that communicates the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 with the tip 121 of the outer peripheral lip 103 of the partition seal 52.
- a groove 122 is formed. Therefore, even if the partition seal 52 is sucked to the primary supply path 48 side and moves to the wall 90 side in the circumferential groove 33, the outer peripheral lip 103 may come into contact with the wall surface 90 a of the wall 90.
- the radial groove 122 is connected to the groove bottom 88 side and the groove opening 87 side of the front end portion 121 by suppressing the sealing between the front end portion 121 and the wall portion 90 of the outer peripheral lip portion 103 over the entire circumference.
- a radial groove 112 serving as a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102 is also formed at the tip 111 of the inner peripheral lip portion 102 of the partition seal 52. Yes. Therefore, even if the partition seal 52 is sucked to the primary supply path 48 side and moves to the wall 90 side in the circumferential groove 33, the inner peripheral lip 102 may come into contact with the inclined surface 90b of the wall 90, The radial groove 112 is prevented from sealing between the tip portion 111 of the inner peripheral lip portion 102 and the wall portion 90 over the entire circumference, and the groove bottom 88 side and the groove opening 87 side of the tip portion 111 are connected to each other. Communicate.
- the base 101 and the wall 89 are formed from the opening 16 of the cylinder body 15.
- the primary replenishment path 48 is formed through the gap, the gap between the outer peripheral lip 103 and the groove bottom 88 due to the foreign matter F, the gap between the wall 90 and the radial groove 122, and the gap between the wall 90 and the radial groove 112. Air flows to the side, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103 can be detected well. Therefore, a product in which the foreign matter F is mixed between the groove bottom 88 and the outer peripheral lip 103 can be well eliminated. For this reason, the quality of the master cylinder 11 can be improved.
- the radial groove 122 is formed in the front-end
- the circumferential groove 33 is inclined with respect to the radial direction of the primary piston 18 so that the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter as it approaches the partition seal 52. For this reason, even if the partition seal 52 is sucked toward the primary supply path 48 and moves toward the wall portion 90 in the circumferential groove 33, the inner peripheral lip portion 102 can hardly be brought into contact with the inclined surface portion 90 b of the wall portion 90.
- the partition seal 52 includes a circumferential position of the radial groove 112 as a passage formed in the distal end portion 111 of the inner peripheral lip portion 102 and a radial groove 122 as a passage formed in the distal end portion 121 of the outer peripheral lip portion 103.
- the position in the circumferential direction overlaps. For this reason, when the partition seal 52 is sucked toward the primary supply path 48 and moved to the wall 90 side in the circumferential groove 33, the distal end portion 111 of the inner peripheral lip portion 102 and the distal end portion 121 of the outer peripheral lip portion 103 Even if they come into contact with each other, it is possible to prevent the communication between the radial groove 112 and the radial groove 122 from being blocked. Therefore, it can further be suppressed that the space between the partition seal 52 and the wall 90 is in a sealed state over the entire circumference.
- the radial groove 122 is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 even when the outer peripheral lip 103 is deformed to the maximum in the peripheral groove 33.
- the radial groove 112 is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the inner peripheral lip 102 even when the inner peripheral lip 102 is deformed to the maximum in the peripheral groove 33.
- the second embodiment has a partition seal 52A that is partially different from the partition seal 52 of the first embodiment. Unlike the inner peripheral lip portion 102 in which the radial groove 112 of the first embodiment is formed in the distal end portion 111, the partition seal 52A has an inner peripheral lip portion 102A having a distal end portion 111A in which the radial groove 112 is not formed. It has.
- the second embodiment has a cylinder body 15A that is partially different from the cylinder body 15 of the first embodiment.
- the cylinder main body 15A according to the second embodiment has an outer portion in the cylinder radial direction than the minimum inner diameter surface 29a at a portion between the circumferential groove 33 and the opening groove 47 with respect to the sliding inner diameter portion 29 of the first embodiment. It has a sliding inner diameter portion 29A which is different in that a recess 151A is formed.
- the recess 151A allows the circumferential groove 33 and the opening groove 47 to communicate with each other in the cylinder axial direction, and crosses the inclined surface portion 90b of the circumferential groove 33 in the cylinder radial direction.
- a radial groove 122 serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 is formed at the tip 121 of the outer peripheral lip 103 of the partition seal 52A, as in the first embodiment. Is formed. Therefore, even if the partition seal 52A is sucked toward the primary supply path 48 and moves to the wall 90 side in the circumferential groove 33, the outer peripheral lip 103 may come into contact with the wall surface 90a of the wall 90.
- the radial groove 122 regulates that the space between the tip portion 121 of the outer peripheral lip 103 and the wall portion 90 is in a sealed state over the entire circumference, and communicates the groove bottom 88 side and the groove opening 87 side of the tip portion 121.
- the partition seal 52A is sucked toward the primary supply path 48 and moved toward the wall 90 in the circumferential groove 33 so that the inner peripheral lip 102A abuts against the inclined surface 90b of the wall 90. Even if this happens, the recess 151A regulates that the space between the tip portion 111A of the inner peripheral lip portion 102A and the wall portion 90 is sealed over the entire circumference, and the groove bottom 88 side of the tip portion 111A and the groove The opening 87 side is connected.
- the cylinder body 15 From the opening 16, the gap between the base 101 and the wall 89, the gap between the outer peripheral lip 103 and the groove bottom 88 due to the foreign matter F, the gap between the wall 90 and the radial groove 122, and the recess 151A and the tip Air flows to the primary supply path 48 side through the gap with 111A, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103 can be detected well.
- the recess 151A is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the inner peripheral lip 102A even when the inner peripheral lip 102A is deformed to the maximum in the peripheral groove 33.
- the third embodiment has a partition seal 52B that is partially different from the partition seal 52 of the first embodiment. Unlike the outer peripheral lip portion 103 in which the radial groove 122 is formed in the distal end portion 121 of the first embodiment, the partition seal 52B does not have the radial groove 122 formed therein.
- the partition seal 52B includes an outer peripheral lip 103B in which a radial hole 122B (passage) is formed at the tip 121B.
- a plurality of radial holes 122B are formed at intervals in the circumferential direction of the outer peripheral lip 103B.
- the radial hole 122B opens to the distal end side outer peripheral surface 103d and the distal end side inner peripheral surface 103b, and does not open to the distal end surface 103e.
- the radial hole 122B serves as a passage that connects the inner peripheral side and the outer peripheral side of the outer peripheral lip 103B.
- the partition seal 52B does not have the radial groove 112 formed therein.
- the partition seal 52B includes an inner peripheral lip portion 102B in which a radial hole 112B (passage) is formed in the distal end portion 111B.
- a plurality of radial holes 112B are formed at intervals in the circumferential direction of the inner peripheral lip portion 102B.
- the radial hole 112B opens in the distal end side outer peripheral surface 102b and the distal end side inner peripheral surface 102e, and does not open in the distal end surface 102f.
- the radial hole 112B serves as a passage that connects the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102B.
- the plurality of radial holes 122B are in one-to-one correspondence with the radial holes 112B of the inner peripheral lip portion 102B, and the circumferential positions of the partition seals 52B, that is, the phases are matched.
- the partition seal 52B is positioned in the circumferential direction of the radial hole 112B formed in the distal end portion 111B of the inner peripheral lip portion 102B and in the circumferential direction of the radial hole 122B formed in the distal end portion 121B of the outer peripheral lip portion 103B. The position overlaps.
- a radial hole 122B serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip 103B is formed in the tip 121B of the outer peripheral lip 103B of the partition seal 52B. Therefore, the partition seal 52B is sucked toward the primary supply path 48 and moves to the wall 90 side in the circumferential groove 33 as shown in FIG. 8 so that the outer peripheral lip 103B contacts the wall 90a of the wall 90. Even if this occurs, the radial hole 122B allows the groove bottom 88 side and the groove opening 87 side of the tip 121B to communicate with each other.
- a radial hole 112B serving as a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102B is also formed at the tip 111B of the inner peripheral lip portion 102B of the partition seal 52B. ing. Therefore, even if the partition seal 52B is sucked toward the primary supply path 48 and moves toward the wall 90 in the circumferential groove 33, the inner peripheral lip 102B may come into contact with the inclined surface 90b of the wall 90.
- the radial hole 112B allows the groove bottom 88 side and the groove opening 87 side of the tip end portion 111B to communicate with each other.
- the cylinder body 15 Primary replenishment path 48 through the gap 16 between the base 101 and the wall 89, the gap between the outer peripheral lip 103B and the groove bottom 88 due to the foreign matter F, the radial hole 122B, and the radial hole 112B. Air flows to the side, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103B can be detected well.
- a radial hole 122B is formed in the tip 121B of the outer peripheral lip 103B. For this reason, the durability fall of the front-end
- a radial hole 112B is formed in the tip portion 111B of the inner peripheral lip portion 102B. For this reason, the durability fall of the front-end
- the partition seal 52B includes a circumferential position of a radial hole 112B as a passage formed in the distal end portion 111B of the inner peripheral lip portion 102B and a radial hole 122B as a passage formed in the distal end portion 121B of the outer peripheral lip portion 103B.
- the position in the circumferential direction overlaps.
- the radial hole 122B is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the tip 121B even when the outer peripheral lip 103B is deformed to the maximum in the peripheral groove 33.
- the radial hole 112B is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the distal end portion 111B even when the inner peripheral lip portion 102B is deformed to the maximum in the peripheral groove 33.
- a partition seal having an outer peripheral lip portion 103B having a radial hole 122B in the distal end portion 121B of the third embodiment and an inner peripheral lip portion 102A having no passage in the distal end portion 111A of the second embodiment You may combine with cylinder main body 15A which has recess 151A of embodiment. Further, as a partition seal having an outer peripheral lip portion 103B having a radial hole 122B in the distal end portion 121B of the third embodiment and an inner peripheral lip portion 102 having a radial groove 112 in the distal end portion 111 of the first embodiment. good.
- partition seal having an inner peripheral lip portion 102B having a radial hole 112B in the distal end portion 111B of the third embodiment and an outer peripheral lip portion 103 having a radial groove 122 in the distal end portion 121 of the first embodiment. good.
- the master cylinder has a bottomed cylindrical cylinder body having a brake fluid discharge path and a supply path communicating with the reservoir, and is movably disposed in the cylinder body.
- a piston that forms a pressure chamber that supplies hydraulic pressure to the discharge passage between the cylinder body and a circumferential groove that opens to the inner circumferential surface of the cylinder body, Includes a seal that is in sliding contact with the piston to define the replenishment path and the outside of the cylinder body.
- the seal includes an inner peripheral lip portion that protrudes from an annular base portion and slidably contacts the outer peripheral surface of the piston, and an outer peripheral lip portion that contacts the peripheral groove of the cylinder body.
- the outer peripheral lip portion is formed with a passage communicating with the inner peripheral side and the outer peripheral side of the outer peripheral lip portion at the distal end portion.
- a second aspect is the above-described first aspect, wherein the passage of the outer peripheral lip portion is a radial groove formed at a tip portion.
- the passage of the outer peripheral lip portion is a radial hole.
- the circumferential groove has a diameter that increases as the opening side of the wall portion on the bottom side of the cylinder main body approaches the seal. It is inclined with respect to the radial direction.
- the inner peripheral lip portion is formed with a passage communicating with an inner peripheral side and an outer peripheral side of the inner peripheral lip portion at a tip portion. Yes.
- the seal is formed in a circumferential position of the passage formed at a distal end portion of the inner peripheral lip portion and the passage formed at a distal end portion of the outer peripheral lip portion. The position in the circumferential direction overlaps.
- the quality can be improved.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Transmission Of Braking Force In Braking Systems (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
This master cylinder is provided with a seal (52) that is disposed within a circumferential groove (33) formed so as to have an opening in an inner circumferential surface (15a) of a cylinder body (15), that has an inner circumference that comes into sliding contact with a piston (18), and that defines the outside of the cylinder body (15) and a supply channel (48). The seal (52) has: an inner circumferential lip (102) that comes into sliding contact with an outer circumferential surface (18z) of the piston (18); and an outer circumferential lip (103) that abuts against the circumferential groove (33) of the cylinder body (15). The outer circumferential lip (103) has formed at a leading end (121) thereof a passage way (122) that connects between the inner circumferential side and the outer circumferential side of the outer circumferential lip (103).
Description
本発明は、車両の制動用シリンダへ液圧を供給するマスタシリンダに関する。
本願は、2018年5月29日に、日本に出願された特願2018-102318号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a master cylinder that supplies hydraulic pressure to a brake cylinder of a vehicle.
This application claims priority on May 29, 2018 based on Japanese Patent Application No. 2018-102318 for which it applied to Japan, and uses the content for it here.
本願は、2018年5月29日に、日本に出願された特願2018-102318号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a master cylinder that supplies hydraulic pressure to a brake cylinder of a vehicle.
This application claims priority on May 29, 2018 based on Japanese Patent Application No. 2018-102318 for which it applied to Japan, and uses the content for it here.
マスタシリンダには、リザーバに連通する補給路とシリンダ本体の外部とを画成するためのシールをシリンダ本体の周溝に設けたものがある(例えば特許文献1参照)。
Some master cylinders are provided with a seal for defining a replenishment path communicating with a reservoir and the outside of the cylinder body in a circumferential groove of the cylinder body (see, for example, Patent Document 1).
マスタシリンダにおいて品質向上が要望されている。
Demand for quality improvement in master cylinders.
本発明は、品質を向上することが可能なマスタシリンダを提供する。
The present invention provides a master cylinder capable of improving quality.
本発明の一態様によれば、マスタシリンダは、シリンダ本体の内周面に開口して形成される周溝内に配置され、内周がピストンに摺接して補給路と前記シリンダ本体の外部とを画成するシールを備える。前記シールは、円環状の基部から突出する、前記ピストンの外周面に摺接する内周リップ部および前記シリンダ本体の前記周溝に当接する外周リップ部を有する。前記外周リップ部には、先端部に該外周リップ部の内周側と外周側とを連通する通路が形成されている。
According to one aspect of the present invention, the master cylinder is disposed in a circumferential groove formed by opening in the inner peripheral surface of the cylinder body, and the inner periphery is in sliding contact with the piston, With a seal that defines The seal includes an inner peripheral lip portion that protrudes from an annular base portion and slidably contacts the outer peripheral surface of the piston, and an outer peripheral lip portion that contacts the peripheral groove of the cylinder body. The outer peripheral lip portion is formed with a passage communicating with the inner peripheral side and the outer peripheral side of the outer peripheral lip portion at the distal end portion.
上記したマスタシリンダによれば、品質を向上することが可能となる。
According to the master cylinder described above, the quality can be improved.
[第1実施形態]
本発明に係る第1実施形態を図1~図6に基づいて説明する。図1に示す第1実施形態のマスタシリンダ11は、図示略のブレーキペダルの操作量に応じた力が図示略のブレーキブースタの出力軸を介して導入される。マスタシリンダ11は、ブレーキペダルの操作量に応じたブレーキ液圧を発生させる。このマスタシリンダ11には、マスタシリンダ11に対しブレーキ液を給排するリザーバ12(図1において一部のみ図示)が鉛直方向上側に取り付けられている。なお、本実施形態においては、マスタシリンダ11に直接リザーバ12を取り付けているが、マスタシリンダ11から離間した位置にリザーバを配置し、リザーバとマスタシリンダ11とを配管で接続するようにしても良い。 [First Embodiment]
A first embodiment according to the present invention will be described with reference to FIGS. In themaster cylinder 11 according to the first embodiment shown in FIG. 1, a force corresponding to an operation amount of a brake pedal (not shown) is introduced through an output shaft of a brake booster (not shown). The master cylinder 11 generates a brake fluid pressure corresponding to the operation amount of the brake pedal. A reservoir 12 (only a part of which is shown in FIG. 1) for supplying and discharging brake fluid to / from the master cylinder 11 is attached to the master cylinder 11 on the upper side in the vertical direction. In the present embodiment, the reservoir 12 is directly attached to the master cylinder 11, but the reservoir may be disposed at a position separated from the master cylinder 11, and the reservoir and the master cylinder 11 may be connected by piping. .
本発明に係る第1実施形態を図1~図6に基づいて説明する。図1に示す第1実施形態のマスタシリンダ11は、図示略のブレーキペダルの操作量に応じた力が図示略のブレーキブースタの出力軸を介して導入される。マスタシリンダ11は、ブレーキペダルの操作量に応じたブレーキ液圧を発生させる。このマスタシリンダ11には、マスタシリンダ11に対しブレーキ液を給排するリザーバ12(図1において一部のみ図示)が鉛直方向上側に取り付けられている。なお、本実施形態においては、マスタシリンダ11に直接リザーバ12を取り付けているが、マスタシリンダ11から離間した位置にリザーバを配置し、リザーバとマスタシリンダ11とを配管で接続するようにしても良い。 [First Embodiment]
A first embodiment according to the present invention will be described with reference to FIGS. In the
マスタシリンダ11は、底部13と筒部14とを有する有底筒状に一つの素材から加工されて形成される金属製のシリンダ本体15を有している。シリンダ本体15は、軸方向一側が開口部16とされ、軸方向他側が底部13とされている。このシリンダ本体15内の開口部16側には、シリンダ本体15から一部突出して金属製のプライマリピストン18(ピストン)が移動可能に配設されている。シリンダ本体15内のプライマリピストン18よりも底部13側には、同じく金属製のセカンダリピストン19が移動可能に配設されている。プライマリピストン18には底面を有する内周孔21が形成されている。セカンダリピストン19には底面を有する内周孔22が形成されている。マスタシリンダ11は、いわゆるプランジャ型である。また、マスタシリンダ11は、上記したように2つのプライマリピストン18およびセカンダリピストン19を有するタンデムタイプのマスタシリンダである。なお、本発明は、上記タンデムタイプのマスタシリンダへの適用に限られるものではなく、プランジャ型のマスタシリンダであれば、シリンダ本体に1つのピストンを配したシングルタイプのマスタシリンダや、3つ以上のピストンを有するマスタシリンダ等のいかなるプランジャ型のマスタシリンダにも適用できる。
The master cylinder 11 has a cylinder body 15 made of metal that is formed by processing a single material into a bottomed cylinder having a bottom 13 and a cylinder 14. The cylinder body 15 has an opening 16 on one side in the axial direction and a bottom 13 on the other side in the axial direction. A metal primary piston 18 (piston) is movably disposed on the opening 16 side in the cylinder body 15 so as to partially protrude from the cylinder body 15. Similarly, a metal secondary piston 19 is movably disposed on the bottom 13 side of the primary piston 18 in the cylinder body 15. An inner peripheral hole 21 having a bottom surface is formed in the primary piston 18. The secondary piston 19 has an inner peripheral hole 22 having a bottom surface. The master cylinder 11 is a so-called plunger type. The master cylinder 11 is a tandem type master cylinder having two primary pistons 18 and secondary pistons 19 as described above. The present invention is not limited to the application to the tandem type master cylinder, and if it is a plunger type master cylinder, a single type master cylinder in which one piston is arranged in the cylinder body, or three or more types. The present invention can be applied to any plunger type master cylinder such as a master cylinder having a plurality of pistons.
シリンダ本体15には、その筒部14の径方向(以下、シリンダ径方向と称す)の外側に突出する取付台部23が、その筒部14の円周方向(以下、シリンダ周方向と称す)における所定位置に一体に形成されている。この取付台部23には、リザーバ12を取り付けるための取付穴24および取付穴25が形成されている。なお、本実施形態においては、取付穴24および取付穴25は、互いにシリンダ周方向における位置を一致させた状態で、シリンダ本体15の筒部14の軸線(以下、シリンダ軸と称す)方向における位置をずらしてシリンダ本体15の鉛直方向の上部に形成されている。シリンダ本体15は、その筒部14の軸方向(以下、シリンダ軸方向と称す)が車両前後方向に沿う姿勢で車両に配置される。以下、シリンダ軸方向におけるシリンダ本体15の開口部16側を、シリンダ開口側と称し、シリンダ軸方向におけるシリンダ本体15の底部13側を、シリンダ底側と称す。
The cylinder body 15 has a mounting base portion 23 protruding outward in the radial direction of the cylindrical portion 14 (hereinafter referred to as the cylinder radial direction), and in the circumferential direction of the cylindrical portion 14 (hereinafter referred to as the cylinder circumferential direction). Are integrally formed at predetermined positions. The mounting base 23 is formed with mounting holes 24 and mounting holes 25 for mounting the reservoir 12. In the present embodiment, the mounting hole 24 and the mounting hole 25 are positioned in the axial direction (hereinafter referred to as the cylinder axis) of the cylinder portion 14 of the cylinder body 15 in a state where the positions in the cylinder circumferential direction coincide with each other. Is formed at the upper part of the cylinder body 15 in the vertical direction. The cylinder body 15 is disposed in the vehicle in such a posture that the axial direction of the cylindrical portion 14 (hereinafter referred to as the cylinder axial direction) is along the vehicle longitudinal direction. Hereinafter, the opening 16 side of the cylinder body 15 in the cylinder axial direction is referred to as a cylinder opening side, and the bottom 13 side of the cylinder body 15 in the cylinder axial direction is referred to as a cylinder bottom side.
シリンダ本体15の筒部14の取付台部23側には、シリンダ軸方向における底部13の近傍に、ブレーキ液の吐出路であるセカンダリ吐出路26が形成されている。また、セカンダリ吐出路26よりもシリンダ本体15のシリンダ開口側に、ブレーキ液の吐出路であるプライマリ吐出路27(吐出路)が形成されている。言い換えれば、シリンダ本体15は、いずれもブレーキ液の吐出路であるセカンダリ吐出路26およびプライマリ吐出路27を有している。これらセカンダリ吐出路26およびプライマリ吐出路27は、図示は略すが、ブレーキ配管を介してディスクブレーキやドラムブレーキ等の制動用シリンダに連通しており、制動用シリンダに向けてブレーキ液を吐出する。なお、本実施形態においては、これらセカンダリ吐出路26およびプライマリ吐出路27が、互いにシリンダ周方向における位置を一致させた状態でシリンダ軸方向における位置をずらして形成されている。
A secondary discharge path 26 that is a brake fluid discharge path is formed in the vicinity of the bottom 13 in the cylinder axis direction on the mounting base 23 side of the cylinder portion 14 of the cylinder body 15. Further, a primary discharge path 27 (discharge path) that is a brake liquid discharge path is formed on the cylinder opening side of the cylinder body 15 with respect to the secondary discharge path 26. In other words, the cylinder body 15 has a secondary discharge path 26 and a primary discharge path 27, both of which are brake fluid discharge paths. Although not shown, the secondary discharge path 26 and the primary discharge path 27 communicate with a brake cylinder such as a disc brake or a drum brake via a brake pipe, and discharge brake fluid toward the brake cylinder. In the present embodiment, the secondary discharge path 26 and the primary discharge path 27 are formed so that the positions in the cylinder axial direction are shifted in a state where the positions in the cylinder circumferential direction coincide with each other.
シリンダ本体15の筒部14のシリンダ底側の内周部には、摺動内径部28が形成されている。摺動内径部28は、シリンダ軸方向のその両側の筒部14の内周部よりもシリンダ径方向内方に突出している。摺動内径部28は、シリンダ周方向に環状をなしている。セカンダリピストン19は、この摺動内径部28の最小内径面28aに摺動可能に嵌合されている。セカンダリピストン19は、この最小内径面28aで案内されてシリンダ軸方向に移動する。シリンダ本体15の筒部14のシリンダ開口側の内周部には、摺動内径部29が形成されている。摺動内径部29は、そのシリンダ底側の筒部14の内周部よりもシリンダ径方向内方に突出している。摺動内径部29は、シリンダ周方向に環状をなしている。プライマリピストン18は、この摺動内径部29の最小内径面29aに摺動可能に嵌合されている。プライマリピストン18は、この最小内径面29aで案内されてシリンダ軸方向に移動する。
A sliding inner diameter portion 28 is formed on the inner peripheral portion of the cylinder portion 14 of the cylinder body 15 on the cylinder bottom side. The sliding inner diameter portion 28 protrudes inward in the cylinder radial direction from the inner peripheral portion of the cylindrical portion 14 on both sides in the cylinder axial direction. The sliding inner diameter portion 28 has an annular shape in the cylinder circumferential direction. The secondary piston 19 is slidably fitted to the minimum inner diameter surface 28 a of the sliding inner diameter portion 28. The secondary piston 19 is guided by the minimum inner diameter surface 28a and moves in the cylinder axial direction. A sliding inner diameter portion 29 is formed on an inner peripheral portion of the cylinder portion 14 of the cylinder body 15 on the cylinder opening side. The sliding inner diameter portion 29 protrudes inward in the cylinder radial direction from the inner peripheral portion of the cylinder portion 14 on the cylinder bottom side. The sliding inner diameter portion 29 has an annular shape in the cylinder circumferential direction. The primary piston 18 is slidably fitted to the minimum inner diameter surface 29 a of the sliding inner diameter portion 29. The primary piston 18 is guided by the minimum inner diameter surface 29a and moves in the cylinder axis direction.
摺動内径部28には、シリンダ軸方向における位置をずらして複数具体的には2カ所のいずれも円環状をなす周溝30、周溝31がシリンダ底側からこの順に形成されている。
また、摺動内径部29にも、シリンダ軸方向における位置をずらして複数具体的には2カ所のいずれも円環状をなす周溝32、周溝33がシリンダ底側からこの順に形成されている。周溝30,31は、シリンダ周方向に環状をなして、シリンダ本体15の内周面15aを構成する最小内径面28aよりもシリンダ径方向外側に凹む形状をなしている。周溝32,33は、シリンダ周方向に環状をなして、シリンダ本体15の内周面15aを構成する最小内径面29aよりもシリンダ径方向外側に凹む形状をなしている。周溝33よりもシリンダ開口側は、シリンダ本体15の内周面15aを構成する開口側内径面16aとなっている。周溝33は、この開口側内径面16aよりもシリンダ径方向外側に凹む形状をなしている。開口側内径面16aは最小内径面29aよりも若干大径となっている。周溝30~33は、シリンダ本体15内に、シリンダ本体15の内周面15aに開口して形成されている。周溝30~33は、いずれも全体が切削加工により形成されている。 The slidinginner diameter portion 28 is formed with a circumferential groove 30 and a circumferential groove 31 that are formed in this order from the bottom side of the cylinder in a plurality of positions, in the cylinder axial direction, in a plurality of shapes, specifically in any two places.
In addition, the slidinginner diameter portion 29 is also formed with a circumferential groove 32 and a circumferential groove 33 that are formed in this order from the cylinder bottom side by shifting the position in the cylinder axial direction and forming a plurality of, specifically, two of them in an annular shape. . The circumferential grooves 30 and 31 have an annular shape in the cylinder circumferential direction and have a shape that is recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a constituting the inner circumferential surface 15a of the cylinder body 15. The circumferential grooves 32 and 33 have an annular shape in the cylinder circumferential direction and have a shape that is recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a constituting the inner circumferential surface 15a of the cylinder body 15. The cylinder opening side from the circumferential groove 33 is an opening-side inner diameter surface 16 a that constitutes the inner circumferential surface 15 a of the cylinder body 15. The circumferential groove 33 has a shape that is recessed outward in the cylinder radial direction from the opening-side inner diameter surface 16a. The opening side inner diameter surface 16a is slightly larger in diameter than the minimum inner diameter surface 29a. The circumferential grooves 30 to 33 are formed in the cylinder body 15 so as to open to the inner circumferential surface 15 a of the cylinder body 15. All of the circumferential grooves 30 to 33 are formed by cutting.
また、摺動内径部29にも、シリンダ軸方向における位置をずらして複数具体的には2カ所のいずれも円環状をなす周溝32、周溝33がシリンダ底側からこの順に形成されている。周溝30,31は、シリンダ周方向に環状をなして、シリンダ本体15の内周面15aを構成する最小内径面28aよりもシリンダ径方向外側に凹む形状をなしている。周溝32,33は、シリンダ周方向に環状をなして、シリンダ本体15の内周面15aを構成する最小内径面29aよりもシリンダ径方向外側に凹む形状をなしている。周溝33よりもシリンダ開口側は、シリンダ本体15の内周面15aを構成する開口側内径面16aとなっている。周溝33は、この開口側内径面16aよりもシリンダ径方向外側に凹む形状をなしている。開口側内径面16aは最小内径面29aよりも若干大径となっている。周溝30~33は、シリンダ本体15内に、シリンダ本体15の内周面15aに開口して形成されている。周溝30~33は、いずれも全体が切削加工により形成されている。 The sliding
In addition, the sliding
周溝30~33のうち最もシリンダ底側にある周溝30は、取付穴24および取付穴25のうちのシリンダ底側の取付穴24の近傍に形成されている。この周溝30内には、周溝30に保持されるように円環状のピストンシール35が配置されている。
Of the circumferential grooves 30 to 33, the circumferential groove 30 closest to the cylinder bottom is formed in the vicinity of the mounting hole 24 on the cylinder bottom side of the mounting hole 24 and the mounting hole 25. An annular piston seal 35 is disposed in the circumferential groove 30 so as to be held in the circumferential groove 30.
シリンダ本体15の摺動内径部28における周溝30よりもシリンダ開口側には、最小内径面28aよりもシリンダ径方向外側に凹む環状の開口溝37が形成されている。この開口溝37は、シリンダ底側の取付穴24から穿設される連通穴36を筒部14内に開口させる。ここで、この開口溝37と連通穴36とが、シリンダ本体15に設けられてリザーバ12に常時連通するセカンダリ補給路38を構成している。言い換えれば、シリンダ本体15は、リザーバ12に連通するセカンダリ補給路38を有している。
An annular opening groove 37 is formed on the cylinder opening side of the sliding inner diameter portion 28 of the cylinder body 15 on the cylinder opening side, and is recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a. The opening groove 37 opens a communication hole 36 drilled from the mounting hole 24 on the cylinder bottom side into the cylindrical portion 14. Here, the opening groove 37 and the communication hole 36 constitute a secondary supply path 38 provided in the cylinder body 15 and always communicating with the reservoir 12. In other words, the cylinder body 15 has a secondary supply path 38 that communicates with the reservoir 12.
シリンダ本体15の摺動内径部28の周溝30よりもシリンダ底側には、周溝30に開口するとともに周溝30からシリンダ軸方向に直線状にシリンダ底側に向け延出する連通溝41が、最小内径面28aよりもシリンダ径方向外側に凹むように形成されている。この連通溝41は、底部13と周溝30との間であって底部13の近傍となる位置に形成されたセカンダリ吐出路26と周溝30とを後述のセカンダリ圧力室68を介して連通させる。
A communication groove 41 that opens to the circumferential groove 30 on the cylinder bottom side of the sliding inner diameter portion 28 of the cylinder body 15 and extends linearly from the circumferential groove 30 toward the cylinder bottom side in the cylinder axial direction. However, it is formed so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 28a. The communication groove 41 communicates the secondary discharge passage 26 and the circumferential groove 30 formed at a position between the bottom portion 13 and the circumferential groove 30 and in the vicinity of the bottom portion 13 via a secondary pressure chamber 68 described later. .
シリンダ本体15の摺動内径部28には、シリンダ軸線方向における上記開口溝37の周溝30とは反対側、つまりシリンダ開口側に、上記周溝31が形成されている。この周溝31内には、周溝31に保持されるように、円環状の区画シール42が配置されている。
In the inner diameter sliding portion 28 of the cylinder body 15, the circumferential groove 31 is formed on the side opposite to the circumferential groove 30 of the opening groove 37 in the cylinder axial direction, that is, on the cylinder opening side. An annular partition seal 42 is disposed in the circumferential groove 31 so as to be held in the circumferential groove 31.
シリンダ本体15の摺動内径部29には、シリンダ開口側の取付穴25の近傍に、上記した周溝32が形成されている。この周溝32内には、周溝32に保持されるように円環状のピストンシール45が配置されている。
The above-mentioned circumferential groove 32 is formed in the sliding inner diameter portion 29 of the cylinder body 15 in the vicinity of the mounting hole 25 on the cylinder opening side. An annular piston seal 45 is disposed in the circumferential groove 32 so as to be held in the circumferential groove 32.
シリンダ本体15の摺動内径部29におけるこの周溝32のシリンダ開口側には、最小内径面29aよりもシリンダ径方向外側に凹む環状の開口溝47が形成されている。この開口溝47は、シリンダ開口側の取付穴25から穿設される連通穴46を筒部14内に開口させる。ここで、この開口溝47と連通穴46とが、シリンダ本体15に設けられてリザーバ12に常時連通するプライマリ補給路48(補給路)を主に構成している。言い換えれば、シリンダ本体15は、リザーバ12に連通するプライマリ補給路48を有している。
An annular opening groove 47 is formed on the cylinder opening side of the circumferential groove 32 in the sliding inner diameter portion 29 of the cylinder body 15 so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a. The opening groove 47 opens a communication hole 46 formed in the cylinder opening 14 from the mounting hole 25 on the cylinder opening side. Here, the opening groove 47 and the communication hole 46 mainly constitute a primary supply path 48 (supply path) provided in the cylinder body 15 and always communicating with the reservoir 12. In other words, the cylinder body 15 has a primary supply path 48 that communicates with the reservoir 12.
シリンダ本体15の摺動内径部29の周溝32よりもシリンダ底側には、周溝32に開口するとともに周溝32からシリンダ軸方向に直線状にシリンダ底側に向け延出する連通溝51が、最小内径面29aよりもシリンダ径方向外側に凹むように形成されている。この連通溝51は、周溝31と周溝32との間であって周溝31の近傍となる位置に形成されたプライマリ吐出路27と、周溝32とを後述するプライマリ圧力室85を介して連通させる。
A communication groove 51 that opens to the circumferential groove 32 on the cylinder bottom side of the sliding inner diameter portion 29 of the cylinder body 15 and extends linearly from the circumferential groove 32 toward the cylinder bottom side in the cylinder axial direction. However, it is formed so as to be recessed outward in the cylinder radial direction from the minimum inner diameter surface 29a. The communication groove 51 has a primary discharge passage 27 formed between the circumferential groove 31 and the circumferential groove 32 and in the vicinity of the circumferential groove 31, and the circumferential groove 32 via a primary pressure chamber 85 described later. Communicate.
シリンダ本体15の摺動内径部29における上記開口溝47の周溝32とは反対側、つまりシリンダ開口側に、周溝33が形成されている。この周溝33内には、周溝33に保持されるように、円環状の区画シール52(シール)が配置されている。
A circumferential groove 33 is formed in the sliding inner diameter portion 29 of the cylinder body 15 on the side opposite to the circumferential groove 32 of the opening groove 47, that is, on the cylinder opening side. An annular partition seal 52 (seal) is disposed in the circumferential groove 33 so as to be held in the circumferential groove 33.
シリンダ本体15のシリンダ底側に配置されるセカンダリピストン19は、第1円筒状部55と、第1円筒状部55の軸線方向における一側に形成された底部56と、底部56の第1円筒状部55とは反対側に形成された第2円筒状部57とを有する形状をなしている。上記内周孔22は、これらのうちの第1円筒状部55と底部56とにより形成されている。セカンダリピストン19は、第1円筒状部55をシリンダ本体15のシリンダ底側に配置した状態で、シリンダ本体15の摺動内径部28に設けられたピストンシール35および区画シール42のそれぞれの内周に摺動可能に嵌合される。
The secondary piston 19 disposed on the cylinder bottom side of the cylinder body 15 includes a first cylindrical portion 55, a bottom portion 56 formed on one side in the axial direction of the first cylindrical portion 55, and a first cylinder of the bottom portion 56. It has the shape which has the 2nd cylindrical part 57 formed in the opposite side to the shape part 55. FIG. The inner peripheral hole 22 is formed by the first cylindrical portion 55 and the bottom portion 56 among these. The secondary piston 19 has an inner circumference of each of the piston seal 35 and the partition seal 42 provided on the sliding inner diameter portion 28 of the cylinder body 15 in a state where the first cylindrical portion 55 is disposed on the cylinder bottom side of the cylinder body 15. And is slidably fitted.
第1円筒状部55の底部56とは反対の端側外周部には、セカンダリピストン19の外周面19zにおいて最も大径の最大外径面19aよりも径方向内方に凹む円環状の凹部59が形成されている。この凹部59には、その底部56側にシリンダ径方向に貫通するポート60が複数、シリンダ周方向の等間隔位置に放射状となるように形成されている。
In the outer peripheral portion on the end side opposite to the bottom portion 56 of the first cylindrical portion 55, an annular concave portion 59 that is recessed radially inward from the largest outer diameter surface 19 a having the largest diameter on the outer peripheral surface 19 z of the secondary piston 19. Is formed. In the recess 59, a plurality of ports 60 penetrating in the cylinder radial direction are formed on the bottom 56 side so as to be radially arranged at equal intervals in the cylinder circumferential direction.
セカンダリピストン19とシリンダ本体15の底部13との間には、図示略のブレーキブースタの出力軸から入力がない非制動状態でこれらの間隔を決めるセカンダリピストンスプリング62を含む間隔調整部63が設けられている。この間隔調整部63は、シリンダ本体15の底部13に当接する係止部材64と、この係止部材64に所定範囲内でのみ摺動するように連結されてセカンダリピストン19の底部56に当接する係止部材65とを有している。上記セカンダリピストンスプリング62は、係止部材64と係止部材65との間に介装されている。
Between the secondary piston 19 and the bottom 13 of the cylinder body 15, there is provided an interval adjusting portion 63 including a secondary piston spring 62 that determines the interval in a non-braking state in which there is no input from an output shaft of a brake booster (not shown). ing. The interval adjusting portion 63 is connected to the locking member 64 that contacts the bottom portion 13 of the cylinder body 15 and the locking member 64 so as to slide only within a predetermined range, and contacts the bottom portion 56 of the secondary piston 19. And a locking member 65. The secondary piston spring 62 is interposed between the locking member 64 and the locking member 65.
シリンダ本体15の底部13および筒部14のシリンダ底側とセカンダリピストン19とで囲まれて形成される部分が、ブレーキ液圧を発生してセカンダリ吐出路26にブレーキ液圧を供給するセカンダリ圧力室68となっている。言い換えれば、セカンダリピストン19は、シリンダ本体15との間に、セカンダリ吐出路26へ液圧を供給するセカンダリ圧力室68を形成している。このセカンダリ圧力室68は、セカンダリピストン19がポート60をセカンダリ補給路38に開口させる位置にあるとき、セカンダリ補給路38つまりリザーバ12に連通する。
A portion formed by being surrounded by the bottom 13 of the cylinder body 15 and the cylinder bottom side of the cylinder portion 14 and the secondary piston 19 generates a brake fluid pressure and supplies the brake fluid pressure to the secondary discharge passage 26. 68. In other words, the secondary piston 19 forms a secondary pressure chamber 68 that supplies hydraulic pressure to the secondary discharge passage 26 between the secondary piston 19 and the cylinder body 15. The secondary pressure chamber 68 communicates with the secondary supply path 38, that is, the reservoir 12 when the secondary piston 19 is in a position for opening the port 60 to the secondary supply path 38.
シリンダ本体15の周溝31内に配置されて保持される区画シール42は、合成ゴムからなる一体成形品である。区画シール42は、その中心線を含む面での断面の片側形状が、シリンダ開口側に開口するC字状をなしている。区画シール42は、内周が、シリンダ軸方向に移動するセカンダリピストン19の外周面19zに摺接するとともに、外周がシリンダ本体15の周溝31に当接する。これにより、区画シール42は、セカンダリピストン19およびシリンダ本体15の区画シール42の位置の隙間を常時密封する。
The partition seal 42 disposed and held in the circumferential groove 31 of the cylinder body 15 is an integrally molded product made of synthetic rubber. The section seal 42 has a C-shape in which one side of the cross section on the plane including the center line is open to the cylinder opening side. The partition seal 42 is in sliding contact with the outer peripheral surface 19z of the secondary piston 19 moving in the cylinder axial direction, and the outer periphery is in contact with the peripheral groove 31 of the cylinder body 15. Thus, the partition seal 42 always seals the gap between the secondary piston 19 and the partition seal 42 of the cylinder body 15.
シリンダ本体15の周溝30内に配置されて保持されるピストンシール35は、合成ゴムからなる一体成形品である。ピストンシール35は、その中心線を含む面での断面の片側形状が、シリンダ底側に開口するC字状をなしている。ピストンシール35の内周は、シリンダ軸方向に移動するセカンダリピストン19の外周面19zに摺接する。また、ピストンシール35の外周は、シリンダ本体15の周溝30に当接する。周溝30に設けられるこのピストンシール35は、セカンダリピストン19がポート60をピストンシール35よりもシリンダ底側に位置させた状態では、セカンダリ補給路38とセカンダリ圧力室68との間を密封可能となっている。つまり、ピストンシール35は、セカンダリ圧力室68と、セカンダリ補給路38およびリザーバ12との連通を遮断して密封することが可能である。この密封状態で、セカンダリピストン19が、シリンダ本体15の摺動内径部28およびシリンダ本体15に保持されたピストンシール35および区画シール42の内周で摺動してシリンダ底側に移動することによって、セカンダリ圧力室68内のブレーキ液が加圧される。セカンダリ圧力室68内で加圧されたブレーキ液は、セカンダリ吐出路26から車輪側の制動用シリンダに供給される。
The piston seal 35 disposed and held in the circumferential groove 30 of the cylinder body 15 is an integrally molded product made of synthetic rubber. The piston seal 35 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side. The inner periphery of the piston seal 35 is in sliding contact with the outer peripheral surface 19z of the secondary piston 19 that moves in the cylinder axial direction. Further, the outer periphery of the piston seal 35 abuts on the circumferential groove 30 of the cylinder body 15. The piston seal 35 provided in the circumferential groove 30 can seal between the secondary supply passage 38 and the secondary pressure chamber 68 when the secondary piston 19 positions the port 60 on the cylinder bottom side of the piston seal 35. It has become. That is, the piston seal 35 can be sealed by blocking communication between the secondary pressure chamber 68 and the secondary supply path 38 and the reservoir 12. In this sealed state, the secondary piston 19 slides on the sliding inner diameter portion 28 of the cylinder body 15 and the inner periphery of the piston seal 35 and the partition seal 42 held by the cylinder body 15 and moves to the cylinder bottom side. The brake fluid in the secondary pressure chamber 68 is pressurized. The brake fluid pressurized in the secondary pressure chamber 68 is supplied from the secondary discharge passage 26 to the brake cylinder on the wheel side.
図示略のブレーキブースタの出力軸から入力がなく上述のセカンダリピストン19が図1に示すようにポート60をセカンダリ補給路38に開口させる基本位置(非制動位置)にあるときに、ピストンシール35は、上記セカンダリピストン19の凹部59内にあって、ポート60にその一部がシリンダ軸方向に重なる。そして、セカンダリピストン19がシリンダ本体15のシリンダ底側へ移動してピストンシール35の内周部がポート60に全て重なると、セカンダリ圧力室68とリザーバ12との連通が遮断される。
When there is no input from the output shaft of a brake booster (not shown) and the secondary piston 19 is in a basic position (non-braking position) where the port 60 is opened to the secondary supply path 38 as shown in FIG. In the recess 59 of the secondary piston 19, a part of the port 60 overlaps in the cylinder axial direction. When the secondary piston 19 moves to the cylinder bottom side of the cylinder body 15 and the inner peripheral portion of the piston seal 35 is completely overlapped with the port 60, the communication between the secondary pressure chamber 68 and the reservoir 12 is blocked.
シリンダ本体15のシリンダ開口側に配置されるプライマリピストン18は、第1円筒状部71と、第1円筒状部71の軸線方向における一側に形成された底部72と、底部72の第1円筒状部71とは反対側に形成された第2円筒状部73とを有する形状をなしている。上記内周孔21は、これらのうちの第1円筒状部71と底部72とにより形成されている。プライマリピストン18は、第1円筒状部71をシリンダ本体15内のセカンダリピストン19側に配置した状態で、シリンダ本体15の摺動内径部29に設けられたピストンシール45および区画シール52のそれぞれの内周に摺動可能に嵌合される。ここで、第2円筒状部73の内側には、図示略のブレーキブースタの出力軸が挿入される。この出力軸によって底部72がシリンダ底側に向けて押圧される。
The primary piston 18 disposed on the cylinder opening side of the cylinder body 15 includes a first cylindrical portion 71, a bottom portion 72 formed on one side in the axial direction of the first cylindrical portion 71, and a first cylinder of the bottom portion 72. The shape which has the 2nd cylindrical part 73 formed in the opposite side to the shape part 71 is comprised. The inner peripheral hole 21 is formed by the first cylindrical portion 71 and the bottom portion 72 among them. The primary piston 18 has the first cylindrical portion 71 disposed on the secondary piston 19 side in the cylinder body 15 and each of the piston seal 45 and the partition seal 52 provided on the sliding inner diameter portion 29 of the cylinder body 15. The inner periphery is slidably fitted. Here, an output shaft of a brake booster (not shown) is inserted inside the second cylindrical portion 73. By this output shaft, the bottom 72 is pressed toward the bottom of the cylinder.
第1円筒状部71の底部72とは反対の端側外周部には、プライマリピストン18の外周面18zにおいて最も大径の最大外径面18aよりも径方向内方に凹む円環状の凹部75が形成されている。この凹部75には、その底部72側に径方向に貫通するポート76が複数、シリンダ周方向の等間隔位置に、放射状となるように形成されている。
In the outer peripheral portion on the end side opposite to the bottom 72 of the first cylindrical portion 71, an annular concave portion 75 that is recessed radially inward from the largest outer diameter surface 18 a having the largest diameter on the outer peripheral surface 18 z of the primary piston 18. Is formed. The recess 75 is formed with a plurality of ports 76 penetrating in the radial direction on the bottom 72 side so as to be radially arranged at equal intervals in the cylinder circumferential direction.
セカンダリピストン19とプライマリピストン18との間には、図示略のブレーキブースタの出力軸から入力がない非制動状態でこれらの間隔を決めるプライマリピストンスプリング78を含む間隔調整部79が設けられている。この間隔調整部79は、プライマリピストン18の底部72に当接する係止部材81と、セカンダリピストン19の底部56に当接する係止部材82と、係止部材81に一端部が固定されるとともに係止部材82を所定範囲内でのみ摺動自在に支持する軸部材83とを有している。上記プライマリピストンスプリング78は、係止部材81と係止部材82との間に介装されている。
Between the secondary piston 19 and the primary piston 18, there is provided an interval adjusting portion 79 including a primary piston spring 78 that determines these intervals in a non-braking state without input from an output shaft of a brake booster (not shown). The gap adjusting portion 79 includes a locking member 81 that contacts the bottom 72 of the primary piston 18, a locking member 82 that contacts the bottom 56 of the secondary piston 19, and one end fixed to the locking member 81. And a shaft member 83 that slidably supports the stop member 82 only within a predetermined range. The primary piston spring 78 is interposed between the locking member 81 and the locking member 82.
シリンダ本体15の筒部14とプライマリピストン18とセカンダリピストン19とで囲まれて形成される部分が、ブレーキ液圧を発生してプライマリ吐出路27にブレーキ液を供給するプライマリ圧力室85(圧力室)となっている。言い換えれば、プライマリピストン18は、セカンダリピストン19およびシリンダ本体15との間に、プライマリ吐出路27へ液圧を供給するプライマリ圧力室85を形成している。このプライマリ圧力室85は、プライマリピストン18がポート76をプライマリ補給路48に開口させる位置にあるとき、プライマリ補給路48つまりリザーバ12に連通する。
A portion of the cylinder body 15 surrounded by the cylindrical portion 14, the primary piston 18 and the secondary piston 19 generates a primary pressure chamber 85 (pressure chamber) that generates brake fluid pressure and supplies brake fluid to the primary discharge passage 27. ). In other words, the primary piston 18 forms a primary pressure chamber 85 that supplies hydraulic pressure to the primary discharge passage 27 between the secondary piston 19 and the cylinder body 15. The primary pressure chamber 85 communicates with the primary supply path 48, that is, the reservoir 12 when the primary piston 18 is in a position to open the port 76 to the primary supply path 48.
シリンダ本体15の周溝33内に配置されて保持される区画シール52は、合成ゴムからなる一体成形品である。区画シール52は、その中心線を含む面での断面の片側形状が、シリンダ底側に開口するC字状をなしている。区画シール52は、内周が、シリンダ軸方向に移動するプライマリピストン18の外周面18zに摺接するとともに、外周がシリンダ本体15の周溝33に当接する。これにより、区画シール52は、プライマリピストン18およびシリンダ本体15の区画シール52の位置の隙間を常時密封する。区画シール52は、プライマリ補給路48と、シリンダ本体15の外部すなわちマスタシリンダ11の外部とを画成する。
The partition seal 52 arranged and held in the circumferential groove 33 of the cylinder body 15 is an integrally molded product made of synthetic rubber. The section seal 52 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side. The partition seal 52 is in sliding contact with the outer peripheral surface 18z of the primary piston 18 moving in the cylinder axial direction, and the outer periphery is in contact with the peripheral groove 33 of the cylinder body 15. Thereby, the partition seal 52 always seals the gap between the primary piston 18 and the position of the partition seal 52 of the cylinder body 15. The partition seal 52 defines the primary supply path 48 and the outside of the cylinder body 15, that is, the outside of the master cylinder 11.
シリンダ本体15の周溝32内に配置されて保持されるピストンシール45は、合成ゴムからなる一体成形品である。ピストンシール45は、その中心線を含む面での断面の片側形状が、シリンダ底側に開口するC字状をなしている。ピストンシール45の内周は、シリンダ軸方向に移動するプライマリピストン18の外周面18zに摺接する。ピストンシール45の外周は、シリンダ本体15の周溝32に当接する。周溝32に設けられるこのピストンシール45は、プライマリピストン18がポート76をピストンシール45よりもシリンダ底側に位置させた状態では、プライマリ補給路48とプライマリ圧力室85との間を密封可能である。つまり、ピストンシール45は、プライマリ圧力室85と、プライマリ補給路48およびリザーバ12との連通を遮断して密封することが可能である。この密封状態で、プライマリピストン18が、シリンダ本体15の摺動内径部29およびシリンダ本体15に保持されたピストンシール45および区画シール52の内周で摺動してシリンダ底側に移動することによって、プライマリ圧力室85内のブレーキ液が加圧される。プライマリ圧力室85内で加圧されたブレーキ液は、プライマリ吐出路27から車輪側の制動用シリンダに供給される。
The piston seal 45 disposed and held in the circumferential groove 32 of the cylinder body 15 is an integrally molded product made of synthetic rubber. The piston seal 45 has a C-shape in which one side of the cross section on the surface including the center line is open to the cylinder bottom side. The inner periphery of the piston seal 45 is in sliding contact with the outer peripheral surface 18z of the primary piston 18 that moves in the cylinder axial direction. The outer periphery of the piston seal 45 abuts on the circumferential groove 32 of the cylinder body 15. The piston seal 45 provided in the circumferential groove 32 can seal between the primary supply passage 48 and the primary pressure chamber 85 when the primary piston 18 has the port 76 positioned on the cylinder bottom side of the piston seal 45. is there. That is, the piston seal 45 can be sealed by blocking communication between the primary pressure chamber 85 and the primary supply path 48 and the reservoir 12. In this sealed state, the primary piston 18 slides on the sliding inner diameter portion 29 of the cylinder body 15 and the inner periphery of the piston seal 45 and the partition seal 52 held by the cylinder body 15 and moves to the cylinder bottom side. The brake fluid in the primary pressure chamber 85 is pressurized. The brake fluid pressurized in the primary pressure chamber 85 is supplied from the primary discharge path 27 to the brake cylinder on the wheel side.
図示略のブレーキブースタの出力軸から入力がなく、プライマリピストン18が図1に示すようにポート76をプライマリ補給路48に開口させる基本位置(非制動位置)にあるときに、ピストンシール45は、上記プライマリピストン18の凹部75内にあって、ポート76にその一部がシリンダ軸方向に重なる。そして、プライマリピストン18がシリンダ本体15のシリンダ底側へ移動してピストンシール45の内周部がポート76に全て重なると、プライマリ圧力室85とリザーバ12との連通が遮断される。
When there is no input from the output shaft of a brake booster (not shown), and the primary piston 18 is in a basic position (non-braking position) that opens the port 76 to the primary supply path 48 as shown in FIG. In the recess 75 of the primary piston 18, a part of the port 76 overlaps in the cylinder axial direction. Then, when the primary piston 18 moves to the cylinder bottom side of the cylinder body 15 and the inner peripheral portion of the piston seal 45 completely overlaps the port 76, the communication between the primary pressure chamber 85 and the reservoir 12 is blocked.
図2に示すように、開口側内径面16aおよび最小内径面29aよりもシリンダ径方向外方に凹む周溝33は、開口側内径面16aおよび最小内径面29aの位置に溝開口87(開口)を有している。周溝33は、その凹み方向の奥側、すなわちシリンダ径方向外側に溝底88を有している。また、周溝33は、溝底88におけるシリンダ開口側の端縁部からシリンダ径方向内方に広がる壁部89を有している。さらに、周溝33は、溝底88におけるシリンダ底側の端縁部からシリンダ径方向内方に広がる壁部90を有している。これら溝底88、壁部89および壁部90は、シリンダ本体15自体に形成されている。溝底88、壁部89および壁部90は、シリンダ本体15に対する切削加工により形成されている。
As shown in FIG. 2, the circumferential groove 33 that is recessed outward in the cylinder radial direction from the opening-side inner diameter surface 16a and the minimum inner diameter surface 29a is a groove opening 87 (opening) at the position of the opening-side inner diameter surface 16a and the minimum inner diameter surface 29a. have. The circumferential groove 33 has a groove bottom 88 on the inner side in the recess direction, that is, on the outer side in the cylinder radial direction. Further, the circumferential groove 33 has a wall portion 89 that spreads inwardly in the cylinder radial direction from the end portion of the groove bottom 88 on the cylinder opening side. Further, the circumferential groove 33 has a wall portion 90 that extends inwardly in the cylinder radial direction from an end edge portion of the groove bottom 88 on the cylinder bottom side. The groove bottom 88, the wall 89, and the wall 90 are formed in the cylinder body 15 itself. The groove bottom 88, the wall 89 and the wall 90 are formed by cutting the cylinder body 15.
溝底88は溝底面部88aを有している。溝底面部88aは、シリンダ軸を中心とする円筒面であり、シリンダ軸方向の長さがシリンダ周方向の全周に亘って一定となっている。
The groove bottom 88 has a groove bottom surface portion 88a. The groove bottom surface portion 88a is a cylindrical surface centered on the cylinder axis, and the length in the cylinder axis direction is constant over the entire circumference in the cylinder circumferential direction.
周溝33のシリンダ開口側の壁部89は、壁面部89aを有している。壁面部89aは、溝底88のシリンダ開口側からシリンダ径方向の内方に広がっている。壁面部89aは、シリンダ軸の直交面に平行な平坦面からなっている。壁面部89aは、シリンダ周方向の全周に亘って、一定内径かつ一定外径でシリンダ径方向に一定幅となっており、シリンダ軸を中心とする円環状をなしている。壁面部89aの大径側の端縁部と溝底面部88aのシリンダ開口側の端縁部とはR面取り89bで接続されている。
The wall 89 on the cylinder opening side of the circumferential groove 33 has a wall surface 89a. The wall surface portion 89a extends inward in the cylinder radial direction from the cylinder opening side of the groove bottom 88. The wall surface portion 89a is a flat surface parallel to the orthogonal surface of the cylinder axis. The wall surface portion 89a has a constant inner diameter, a constant outer diameter, and a constant width in the cylinder radial direction over the entire circumference in the cylinder circumferential direction, and has an annular shape centering on the cylinder shaft. The edge on the large diameter side of the wall surface 89a and the edge on the cylinder opening side of the groove bottom 88a are connected by an R chamfer 89b.
周溝33のシリンダ底側の壁部90は、シリンダ軸方向において壁部89に対向している。壁部90は、壁面部90aと、斜面部90bとを有している。壁面部90aは、溝底88のシリンダ底側からシリンダ径方向の内方に広がっている。壁面部90aは、シリンダ軸の直交面に平行な平坦面からなっている。壁面部90aは、シリンダ周方向の全周に亘って、一定内径かつ一定外径でシリンダ径方向に一定幅となっており、シリンダ軸を中心とする円環状をなしている。
The wall portion 90 on the cylinder bottom side of the circumferential groove 33 faces the wall portion 89 in the cylinder axial direction. The wall part 90 has a wall surface part 90a and a slope part 90b. The wall surface portion 90a extends inward in the cylinder radial direction from the cylinder bottom side of the groove bottom 88. The wall surface portion 90a is a flat surface parallel to the orthogonal surface of the cylinder axis. The wall surface portion 90a has a constant inner diameter, a constant outer diameter, and a constant width in the cylinder radial direction over the entire circumference in the cylinder circumferential direction, and has an annular shape centering on the cylinder axis.
斜面部90bは、壁面部90aのシリンダ径方向の内端縁部からシリンダ径方向の内方に、シリンダ径方向の内側ほどシリンダ底側に位置するようにシリンダ径方向に対し傾いて延出している。言い換えれば、斜面部90bは、壁面部90aのシリンダ径方向の内端縁部からシリンダ底側に、シリンダ底側ほど縮径するようにテーパ状をなして延出している。斜面部90bは、シリンダ周方向の全周に亘って、一定内径かつ一定外径でシリンダ径方向に一定幅となっており、シリンダ軸方向の長さも一定となっている。
The inclined surface portion 90b extends from the inner end edge of the wall surface portion 90a in the cylinder radial direction inwardly in the cylinder radial direction so as to be inclined with respect to the cylinder radial direction so as to be located on the cylinder bottom side toward the inner side in the cylinder radial direction. Yes. In other words, the inclined surface portion 90b extends from the inner end edge portion of the wall surface portion 90a in the cylinder radial direction to the cylinder bottom side so as to decrease in diameter toward the cylinder bottom side. The inclined surface portion 90b has a constant inner diameter, a constant outer diameter, a constant width in the cylinder radial direction, and a constant length in the cylinder axial direction over the entire circumference in the cylinder circumferential direction.
壁面部90aの大径側の端縁部と溝底面部88aのシリンダ底側の端縁部とはR面取り90cで接続されている。斜面部90bの小径側の端縁部と摺動内径部29の最小内径面29aとはR面取り90dで接続されている。周溝33は、シリンダ底側の壁部90の溝開口87側の斜面部90bが、シリンダ軸方向のシリンダ開口側ほど拡径するようにシリンダ径方向に対して傾斜している。
The edge on the large diameter side of the wall surface portion 90a and the edge on the cylinder bottom side of the groove bottom surface portion 88a are connected by an R chamfer 90c. The edge portion on the small diameter side of the slope portion 90b and the minimum inner diameter surface 29a of the sliding inner diameter portion 29 are connected by an R chamfer 90d. The circumferential groove 33 is inclined with respect to the cylinder radial direction so that the sloped portion 90b on the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter toward the cylinder opening side in the cylinder axial direction.
周溝33に配置される区画シール52は、基部101と内周リップ部102と外周リップ部103とを有している。基部101は、区画シール52におけるシリンダ開口側に配置されている。基部101は、区画シール52の軸直交面に平行な円環板状をなしている。内周リップ部102は、基部101の内周端縁部からシリンダ軸方向に沿ってシリンダ底側に向け突出する円環筒状をなしている。外周リップ部103は、基部101の外周端縁部からシリンダ軸方向に沿ってシリンダ底側に向けて突出する円環筒状をなしている。
The partition seal 52 disposed in the circumferential groove 33 has a base 101, an inner peripheral lip 102, and an outer peripheral lip 103. The base 101 is disposed on the cylinder opening side of the partition seal 52. The base 101 has an annular plate shape parallel to the axis orthogonal plane of the partition seal 52. The inner peripheral lip 102 has an annular cylindrical shape that protrudes from the inner peripheral edge of the base 101 toward the cylinder bottom along the cylinder axial direction. The outer peripheral lip 103 has an annular cylindrical shape that protrudes from the outer peripheral edge of the base 101 toward the cylinder bottom along the cylinder axial direction.
区画シール52は、マスタシリンダ11内に組み込まれる前の自然状態でその中心線を含む面での断面の片側形状が図3に示すようになっている。ここでは、まず、この自然状態にあるときの区画シール52について図3,図4を参照して説明する。
The section seal 52 has a cross-sectional one-side shape on a plane including the center line in a natural state before being assembled in the master cylinder 11 as shown in FIG. Here, first, the partition seal 52 in the natural state will be described with reference to FIGS.
図3に示すように、基部101は、内周リップ部102および外周リップ部103とは反対側の端面101aが、ほぼ平坦な形状であり、一定内径かつ一定外径で径方向に一定幅となっており、円環状をなしている。基部101は、円筒面状の外周面101bと、端面101aの外周端縁部と外周面101bとを接続するR面取り101cと、円筒面状の内周面101dと、端面101aの内周端縁部と内周面101dとを接続するR面取り101eと、を有している。
As shown in FIG. 3, the base 101 has an end surface 101 a opposite to the inner peripheral lip 102 and the outer peripheral lip 103 having a substantially flat shape, a constant inner diameter, a constant outer diameter, and a constant width in the radial direction. It has an annular shape. The base 101 includes a cylindrical outer peripheral surface 101b, an R chamfer 101c connecting the outer peripheral edge of the end surface 101a and the outer peripheral surface 101b, a cylindrical inner peripheral surface 101d, and an inner peripheral edge of the end surface 101a. R chamfer 101e that connects the portion and the inner peripheral surface 101d.
内周リップ部102の径方向外側には、軸方向の基部101側にテーパ状の基端側外周面102aが、基端側外周面102aの基部101とは反対側に円筒面状の先端側外周面102bが、それぞれ形成されている。基端側外周面102aは、基部101から軸方向に離れるほど小径となっている。
On the radially outer side of the inner peripheral lip portion 102, a tapered proximal end outer peripheral surface 102a is formed on the axial base portion 101 side, and a cylindrical surface distal end side is opposite to the base portion 101 of the proximal end outer peripheral surface 102a. Each outer peripheral surface 102b is formed. The proximal outer peripheral surface 102a has a smaller diameter as it is separated from the base 101 in the axial direction.
内周リップ部102の径方向内側には、軸方向の基部101側に、基部101の内周面101dのR面取り101eとは反対側の端縁部から延出するテーパ状の基端側内周面102cが形成されている。内周リップ部102の径方向内側には、基端側内周面102cの基部101とは反対側にテーパ状の中間内周面102dが形成されており、中間内周面102dの基部101とは反対側に円筒面状の先端側内周面102eが形成されている。基端側内周面102cは、基部101から軸方向に離れるほど小径となっている。中間内周面102dは、基部101から軸方向に離れるほど大径となっている。
On the radially inner side of the inner peripheral lip 102, the inner end of the tapered base end extending from the end edge of the inner peripheral surface 101 d of the base 101 opposite to the R chamfer 101 e on the base 101 side in the axial direction. A peripheral surface 102c is formed. A tapered intermediate inner peripheral surface 102d is formed on the inner side in the radial direction of the inner peripheral lip portion 102 on the side opposite to the base 101 of the base end side inner peripheral surface 102c. On the opposite side, a cylindrical surface-like tip side inner peripheral surface 102e is formed. The proximal end inner peripheral surface 102c has a smaller diameter as it is separated from the base 101 in the axial direction. 102 d of intermediate | middle inner peripheral surfaces are large diameter, so that it leaves | separates from the base 101 to an axial direction.
内周リップ部102の基部101とは反対側には、先端側外周面102bの基部101とは反対側の端縁部と先端側内周面102eの基部101とは反対側の端縁部とを結んで先端面102fが形成されている。先端面102fは、ほぼ平坦な形状であり、一定内径かつ一定外径で径方向に一定幅となっている。
On the side opposite to the base 101 of the inner peripheral lip 102, an end edge on the side opposite to the base 101 of the front end side outer peripheral surface 102b and an end edge on the side opposite to the base 101 of the front end inner peripheral surface 102e 102f is formed by connecting the two. The front end face 102f has a substantially flat shape, and has a constant inner diameter and a constant outer diameter and a constant width in the radial direction.
内周リップ部102の先端面102f、先端側外周面102bおよび先端側内周面102eの全体を含む先端部111には、内周リップ部102の内周側と外周側とを連通する通路となる径方向溝112(通路)が、周方向に間隔をあけて複数形成されている。径方向溝112は、具体的には、図4に示すように内周リップ部102の周方向に等間隔で4カ所形成されている。図3に示すように、径方向溝112は、先端側外周面102b、先端面102fおよび先端側内周面102eに連続的に開口し、先端面102fを径方向に横断している。
The distal end portion 111 including the entire distal end surface 102f, the distal end side outer peripheral surface 102b and the distal end side inner peripheral surface 102e of the inner peripheral lip portion 102 has a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102. A plurality of radial grooves 112 (passages) are formed at intervals in the circumferential direction. Specifically, four radial grooves 112 are formed at equal intervals in the circumferential direction of the inner peripheral lip portion 102 as shown in FIG. As shown in FIG. 3, the radial groove 112 continuously opens to the distal end side outer peripheral surface 102b, the distal end surface 102f, and the distal end side inner peripheral surface 102e, and crosses the distal end surface 102f in the radial direction.
外周リップ部103の径方向内側には、軸方向の基部101側にテーパ状の基端側内周面103aが形成されており、基端側内周面103aの基部101とは反対側に円筒面状の先端側内周面103bが形成されている。基端側内周面103aは、基部101から軸方向に離れるほど大径となっている。
A tapered base end inner peripheral surface 103a is formed on the axial base portion 101 side on the radially inner side of the outer peripheral lip portion 103, and a cylinder is formed on the side opposite to the base portion 101 of the base end inner peripheral surface 103a. A planar tip-side inner peripheral surface 103b is formed. The proximal end inner circumferential surface 103a has a larger diameter as it is separated from the base 101 in the axial direction.
外周リップ部103の径方向外側には、軸方向の基部101側に、基部101の外周面101bのR面取り101cとは反対側の端縁部から延出するテーパ状の基端側外周面103cが形成されている。また、外周リップ部103の径方向外側には、基端側外周面103cの基部101とは反対側にテーパ状の先端側外周面103dが形成されている。基端側外周面103cは、基部101から軸方向に離れるほど大径となっている。先端側外周面103dは、基端側外周面103cから軸方向に離れるほど小径となっている。
On the outer side in the radial direction of the outer peripheral lip 103, on the base 101 side in the axial direction, a tapered base outer peripheral surface 103c extending from the end edge of the outer peripheral surface 101b of the base 101 opposite to the R chamfer 101c. Is formed. Further, on the outer side in the radial direction of the outer peripheral lip 103, a tapered distal outer peripheral surface 103d is formed on the side opposite to the base 101 of the proximal outer peripheral surface 103c. The proximal outer peripheral surface 103c has a larger diameter as it is separated from the base 101 in the axial direction. The distal outer circumferential surface 103d has a smaller diameter as it is separated from the proximal outer circumferential surface 103c in the axial direction.
外周リップ部103の基部101とは反対側には、先端側内周面103bの基部101とは反対側の端縁部と先端側外周面103dの基部101とは反対側の端縁部とを結んで先端面103eが形成されている。先端面103eは、ほぼ平坦な形状であり、一定内径かつ一定外径で径方向に一定幅となっている。
On the side opposite to the base 101 of the outer peripheral lip 103, there is an end edge on the side opposite to the base 101 of the tip side inner peripheral surface 103b and an end edge on the side opposite to the base 101 of the tip side outer peripheral surface 103d. A leading end surface 103e is formed by tying. The distal end surface 103e has a substantially flat shape, and has a constant inner diameter, a constant outer diameter, and a constant width in the radial direction.
外周リップ部103の先端面103e、先端側内周面103bおよび先端側外周面103dの全体を含む先端部121には、外周リップ部103の内周側と外周側とを連通する通路となる径方向溝122(通路)が、周方向に間隔をあけて複数形成されている。径方向溝122は、具体的には、図4に示すように外周リップ部103の周方向に等間隔で4カ所形成されている。すなわち、外周リップ部103の径方向溝122の数は、内周リップ部102の径方向溝112と同数となっている。図3に示すように、径方向溝122は、先端側内周面103b、先端面103eおよび先端側外周面103dに連続的に開口し、先端面103eを径方向に横断している。
The distal end portion 121 including the entire distal end surface 103e, distal end side inner peripheral surface 103b, and distal end side outer peripheral surface 103d of the outer peripheral lip portion 103 has a diameter serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip portion 103. A plurality of directional grooves 122 (passages) are formed at intervals in the circumferential direction. Specifically, four radial grooves 122 are formed at equal intervals in the circumferential direction of the outer peripheral lip 103 as shown in FIG. That is, the number of radial grooves 122 of the outer peripheral lip 103 is the same as the number of radial grooves 112 of the inner peripheral lip 102. As shown in FIG. 3, the radial groove 122 opens continuously to the distal end inner peripheral surface 103b, the distal end surface 103e, and the distal end side outer peripheral surface 103d, and crosses the distal end surface 103e in the radial direction.
図4に示すように、複数の径方向溝122は、それぞれが内周リップ部102の径方向溝112と一対一で区画シール52の周方向の位置、すなわち位相を合わせている。言い換えれば、区画シール52は、内周リップ部102の先端部111に形成された径方向溝112の周方向位置と、外周リップ部103の先端部121に形成された径方向溝122の周方向位置とが重なっている。
As shown in FIG. 4, each of the plurality of radial grooves 122 is in one-to-one correspondence with the radial groove 112 of the inner peripheral lip portion 102 and matches the circumferential position, that is, the phase of the partition seal 52. In other words, the partition seal 52 has a circumferential position of the radial groove 112 formed at the distal end portion 111 of the inner peripheral lip portion 102 and a circumferential direction of the radial groove 122 formed at the distal end portion 121 of the outer peripheral lip portion 103. The position overlaps.
自然状態で上記形状となる区画シール52が、図2に示すように、周溝33内に配置され、この区画シール52の内側にプライマリピストン18が嵌合される。この状態で、区画シール52は、外周リップ部103が、溝底88の溝底面部88aに締め代をもって当接し、内周リップ部102が、プライマリピストン18の外周面18zの最大外径面18aに締め代をもって嵌合する。この状態で、区画シール52は、基部101の外周面101bと外周リップ部103の基端側外周面103cとで周溝33の溝底面部88aに当接し、外周リップ部103の先端側外周面103dが基部101とは反対側ほど周溝33の溝底面部88aから径方向に離れるように延出する。また、この状態で、区画シール52は、基本的に、内周リップ部102の基端側内周面102cと中間内周面102dとでプライマリピストン18の外周面18zに当接し、先端側内周面102eがプライマリピストン18の外周面18zから径方向に離間する。また、この状態で、区画シール52は、外周リップ部103の先端側内周面103bと内周リップ部102の先端側外周面102bとが径方向に離間する。
A partition seal 52 having the above shape in a natural state is disposed in the circumferential groove 33 as shown in FIG. 2, and the primary piston 18 is fitted inside the partition seal 52. In this state, in the partition seal 52, the outer peripheral lip portion 103 abuts against the groove bottom surface portion 88a of the groove bottom 88 with a margin, and the inner peripheral lip portion 102 is the maximum outer diameter surface 18a of the outer peripheral surface 18z of the primary piston 18. Fit with a tight margin. In this state, the partition seal 52 comes into contact with the groove bottom surface 88a of the circumferential groove 33 at the outer peripheral surface 101b of the base 101 and the proximal end outer peripheral surface 103c of the outer peripheral lip 103, and the outer peripheral surface of the distal end side of the outer peripheral lip 103 103 d extends away from the groove bottom surface portion 88 a of the circumferential groove 33 in the radial direction toward the side opposite to the base portion 101. In this state, the partition seal 52 basically abuts the outer peripheral surface 18z of the primary piston 18 at the proximal inner peripheral surface 102c and the intermediate inner peripheral surface 102d of the inner peripheral lip portion 102, so The peripheral surface 102e is separated from the outer peripheral surface 18z of the primary piston 18 in the radial direction. Further, in this state, in the partition seal 52, the front end side inner peripheral surface 103b of the outer peripheral lip portion 103 and the front end side outer peripheral surface 102b of the inner peripheral lip portion 102 are separated in the radial direction.
以上の構成の区画シール52は、内周リップ部102が、プライマリピストン18の外周面18zに摺接し、外周リップ部103が、シリンダ本体15の周溝33の溝底面部88aに当接する。
In the partition seal 52 configured as described above, the inner peripheral lip portion 102 is in sliding contact with the outer peripheral surface 18 z of the primary piston 18, and the outer peripheral lip portion 103 is in contact with the groove bottom surface portion 88 a of the peripheral groove 33 of the cylinder body 15.
周溝33は、シリンダ底側の壁部90の溝開口87側の斜面部90bが、シリンダ軸方向において区画シール52に近づくにつれて拡径するように、シリンダ径方向、すなわちプライマリピストン18の径方向に対して傾斜している。また、周溝33は、壁部90の溝底88側の壁面部90aが、区画シール52の外周リップ部103と径方向の位置を重ね合わせて軸方向に対向し、溝開口87側の斜面部90bが、区画シール52の内周リップ部102と径方向の位置を重ね合わせて軸方向に対向する。
The circumferential groove 33 is in the cylinder radial direction, that is, in the radial direction of the primary piston 18 so that the sloped portion 90b on the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter as it approaches the partition seal 52 in the cylinder axial direction. It is inclined with respect to. Further, the circumferential groove 33 has a wall surface portion 90a on the groove bottom 88 side of the wall portion 90 that faces the outer circumferential lip portion 103 of the partition seal 52 in the radial direction so as to face the axial direction. The portion 90b is opposed to the inner circumferential lip portion 102 of the partition seal 52 in the axial direction with the radial position overlapped.
図1は、図示略のブレーキブースタの出力軸側から入力がないマスタシリンダ11の基本状態(ブレーキペダルが操作される前の非制動状態)を示している。この基本状態にあるとき、プライマリピストン18は、ポート76をプライマリ補給路48に連通させている。セカンダリピストン19は、ポート60をセカンダリ補給路38に連通させている。
FIG. 1 shows a basic state (non-braking state before the brake pedal is operated) of the master cylinder 11 in which there is no input from the output shaft side of a brake booster (not shown). When in this basic state, the primary piston 18 allows the port 76 to communicate with the primary supply path 48. The secondary piston 19 makes the port 60 communicate with the secondary supply path 38.
そして、制動時に、図示略のブレーキブースタの出力軸側から入力があって、プライマリピストン18が基本状態からシリンダ底側へ移動すると、ポート76がピストンシール45で閉塞されて、プライマリ圧力室85とプライマリ補給路48との連通が遮断される。その結果、プライマリピストン18のシリンダ底側への移動にともなってプライマリ圧力室85内の液圧が上昇しプライマリ圧力室85内のブレーキ液がプライマリ吐出路27から車輪側の制動用シリンダに供給される。また、これと並行して、セカンダリピストン19が、間隔調整部79を介してプライマリピストン18で押圧されて、基本状態からシリンダ底側へ移動し、ポート60がピストンシール35で閉塞されて、セカンダリ圧力室68とセカンダリ補給路38との連通が遮断される。その結果、セカンダリピストン19のシリンダ底側への移動にともなってセカンダリ圧力室68内の液圧が上昇しセカンダリ圧力室68内のブレーキ液がセカンダリ吐出路26から車輪側の制動用シリンダに供給される。
During braking, when there is an input from the output shaft side of a brake booster (not shown) and the primary piston 18 moves from the basic state to the cylinder bottom side, the port 76 is closed by the piston seal 45, and the primary pressure chamber 85 and Communication with the primary supply path 48 is blocked. As a result, as the primary piston 18 moves toward the cylinder bottom side, the hydraulic pressure in the primary pressure chamber 85 rises and the brake fluid in the primary pressure chamber 85 is supplied from the primary discharge path 27 to the brake cylinder on the wheel side. The In parallel with this, the secondary piston 19 is pressed by the primary piston 18 via the interval adjusting portion 79 and moved from the basic state to the cylinder bottom side, and the port 60 is closed by the piston seal 35, and the secondary piston 19 is closed. The communication between the pressure chamber 68 and the secondary supply path 38 is blocked. As a result, as the secondary piston 19 moves to the cylinder bottom side, the hydraulic pressure in the secondary pressure chamber 68 rises and the brake fluid in the secondary pressure chamber 68 is supplied from the secondary discharge passage 26 to the brake cylinder on the wheel side. The
上記した特許文献1に記載のマスタシリンダは、リザーバに連通する補給路とシリンダ本体の外部とを画成するためのシールをシリンダ本体の周溝に設けている。シールは、その中心線を含む面での断面の片側形状がC字状をなしており、内周リップ部においてプライマリピストンに摺接し外周リップ部においてシリンダ本体の周溝に当接する。
The master cylinder described in Patent Document 1 described above is provided with a seal in the circumferential groove of the cylinder body for defining a replenishment path communicating with the reservoir and the outside of the cylinder body. The seal has a C-shaped one-sided cross section on the surface including the center line, and slidably contacts the primary piston at the inner peripheral lip portion and contacts the peripheral groove of the cylinder body at the outer peripheral lip portion.
第1実施形態のマスタシリンダ11においては、組み上がった状態で各部の密封性の検査が行われるが、区画シール52の密封性も検査される。この場合、例えば、プライマリ補給路48およびプライマリ吐出路27のうちのいずれか一方を塞いだ状態で、いずれか他方から真空引きを行う。そして、プライマリ圧力室85内が所定の負圧状態、例えば、所定値以下の圧力を所定時間維持する状態になれば区画シール52の密封性が良好であると判断し、所定の負圧状態にならなければ区画シール52の密封性が不良であると判断する。
In the master cylinder 11 of the first embodiment, the sealability of each part is inspected in the assembled state, but the sealability of the partition seal 52 is also inspected. In this case, for example, evacuation is performed from either one of the primary replenishment path 48 and the primary discharge path 27 while the other is closed. Then, if the inside of the primary pressure chamber 85 is in a predetermined negative pressure state, for example, a state in which a pressure equal to or lower than a predetermined value is maintained for a predetermined time, it is determined that the sealing performance of the partition seal 52 is good, and the predetermined negative pressure state is reached. If not, it is determined that the sealing performance of the partition seal 52 is poor.
ここで、区画シール52の密封性を不良とする原因として、図5に示すように、周溝33の溝底88と区画シール52の外周リップ部103との間への異物Fの混入がある。異物Fは、例えばシリンダ本体15の切削加工時に生じた切り粉等である。このように混入された異物Fは、周溝33および区画シール52の周方向における少なくとも異物Fの両側に、区画シール52の外周リップ部103と溝底88とが密着しない隙間を形成する。よって、検査時には、この隙間を介してシリンダ本体15の開口部16側から、真空引きされたプライマリ圧力室85に空気が流れ、プライマリ圧力室85内が所定の負圧状態にならない。これを検出することによって区画シール52の密封性の不良を検出することができる。
Here, as a cause of the poor sealing performance of the partition seal 52, foreign matter F is mixed between the groove bottom 88 of the circumferential groove 33 and the outer peripheral lip 103 of the partition seal 52 as shown in FIG. . The foreign matter F is, for example, chips generated when the cylinder body 15 is cut. The foreign matter F mixed in this way forms a gap where the outer peripheral lip 103 of the partition seal 52 and the groove bottom 88 do not adhere to each other at least on both sides of the foreign matter F in the circumferential direction of the circumferential groove 33 and the partition seal 52. Therefore, at the time of inspection, air flows from the opening 16 side of the cylinder body 15 to the evacuated primary pressure chamber 85 through this gap, and the primary pressure chamber 85 does not enter a predetermined negative pressure state. By detecting this, it is possible to detect a poor sealing performance of the partition seal 52.
真空引きの際には、区画シール52がプライマリ補給路48側に吸引されて、図5に示すように周溝33内で壁部90側に移動して外周リップ部103が壁部90の壁面部90aに当接することがある。このような状態になったとき、図6に示すように、外周リップ部103’の先端部121’に外周リップ部103’の内周側と外周側とを連通する通路が形成されていない従来の区画シール52’であると、外周リップ部103’の先端部121’が全周にわたって壁部90の壁面部90aに密着できる。このように密着した場合、異物Fによって区画シール52’の外周リップ部103’と溝底88との間に隙間が形成されても、これよりも上流側となるプライマリ補給路48側で外周リップ部103’の先端部121’が壁部90との間を全周にわたって密封してしまい、大気のプライマリ補給路48側への流入が生じない。その結果、プライマリ補給路48側が所定の負圧状態になって正常と判定されてしまう可能性がある。
At the time of evacuation, the partition seal 52 is sucked toward the primary replenishment path 48 and moves to the wall 90 side in the circumferential groove 33 as shown in FIG. It may abut against the portion 90a. In such a state, as shown in FIG. 6, the front end 121 ′ of the outer peripheral lip 103 ′ is not formed with a passage that connects the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 ′. With the partition seal 52 ′, the tip 121 ′ of the outer peripheral lip 103 ′ can be in close contact with the wall surface 90a of the wall 90 over the entire circumference. In this case, even if a gap is formed between the outer peripheral lip portion 103 ′ of the partition seal 52 ′ and the groove bottom 88 by the foreign matter F, the outer peripheral lip on the primary replenishment path 48 side, which is upstream from this. The tip portion 121 ′ of the portion 103 ′ seals between the wall portion 90 and the entire circumference, so that no air flows into the primary supply path 48 side. As a result, there is a possibility that the primary supply path 48 side is in a predetermined negative pressure state and is determined to be normal.
これに対し、第1実施形態では、図5に示すように、区画シール52の外周リップ部103の先端部121に外周リップ部103の内周側と外周側とを連通する通路となる径方向溝122が形成されている。よって、区画シール52がプライマリ補給路48側に吸引されて、周溝33内で壁部90側に移動して外周リップ部103が壁部90の壁面部90aに当接することがあっても、径方向溝122が外周リップ部103の先端部121と壁部90との間が全周にわたって密封状態となることを抑制して、先端部121の溝底88側と溝開口87側とを連通させる。
On the other hand, in the first embodiment, as shown in FIG. 5, the radial direction becomes a passage that communicates the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 with the tip 121 of the outer peripheral lip 103 of the partition seal 52. A groove 122 is formed. Therefore, even if the partition seal 52 is sucked to the primary supply path 48 side and moves to the wall 90 side in the circumferential groove 33, the outer peripheral lip 103 may come into contact with the wall surface 90 a of the wall 90. The radial groove 122 is connected to the groove bottom 88 side and the groove opening 87 side of the front end portion 121 by suppressing the sealing between the front end portion 121 and the wall portion 90 of the outer peripheral lip portion 103 over the entire circumference. Let
また、第1実施形態では、区画シール52の内周リップ部102の先端部111にも内周リップ部102の内周側と外周側とを連通する通路となる径方向溝112が形成されている。よって、区画シール52がプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動して内周リップ部102が壁部90の斜面部90bに当接することがあっても、径方向溝112が内周リップ部102の先端部111と壁部90との間が全周にわたって密封状態となることを抑制して、先端部111の溝底88側と溝開口87側とを連通させる。
In the first embodiment, a radial groove 112 serving as a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102 is also formed at the tip 111 of the inner peripheral lip portion 102 of the partition seal 52. Yes. Therefore, even if the partition seal 52 is sucked to the primary supply path 48 side and moves to the wall 90 side in the circumferential groove 33, the inner peripheral lip 102 may come into contact with the inclined surface 90b of the wall 90, The radial groove 112 is prevented from sealing between the tip portion 111 of the inner peripheral lip portion 102 and the wall portion 90 over the entire circumference, and the groove bottom 88 side and the groove opening 87 side of the tip portion 111 are connected to each other. Communicate.
以上により、周溝33の溝底88と区画シール52の外周リップ部103との間に異物Fの混入があった場合に、シリンダ本体15の開口部16から、基部101と壁部89との隙間、異物Fによる外周リップ部103と溝底88との隙間、壁部90と径方向溝122との隙間、および、壁部90と径方向溝112との隙間を介して、プライマリ補給路48側に空気が流れ、プライマリ補給路48側の負圧状態を大気圧に近づける。これにより、溝底88と外周リップ部103との間への異物Fの混入を良好に検出することができる。したがって、溝底88と外周リップ部103との間に異物Fが混入した製品を良好に排除することができる。このため、マスタシリンダ11の品質を向上することが可能となる。
As described above, when foreign matter F is mixed between the groove bottom 88 of the circumferential groove 33 and the outer peripheral lip 103 of the partition seal 52, the base 101 and the wall 89 are formed from the opening 16 of the cylinder body 15. The primary replenishment path 48 is formed through the gap, the gap between the outer peripheral lip 103 and the groove bottom 88 due to the foreign matter F, the gap between the wall 90 and the radial groove 122, and the gap between the wall 90 and the radial groove 112. Air flows to the side, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103 can be detected well. Therefore, a product in which the foreign matter F is mixed between the groove bottom 88 and the outer peripheral lip 103 can be well eliminated. For this reason, the quality of the master cylinder 11 can be improved.
区画シール52の外周リップ部103の内周側と外周側とを連通する通路として、外周リップ部103の先端部121に径方向溝122が形成される構造である。このため、区画シール52の一体成形時に径方向溝122を容易に形成することができ、区画シール52の製造が容易となる。
The radial groove 122 is formed in the front-end | tip part 121 of the outer peripheral lip part 103 as a channel | path which connects the inner peripheral side of the outer peripheral lip part 103 of the division seal 52, and an outer peripheral side. For this reason, the radial groove 122 can be easily formed when the partition seal 52 is integrally formed, and the manufacture of the partition seal 52 is facilitated.
周溝33は、シリンダ底側の壁部90の溝開口87側が、区画シール52に近づくにつれて拡径するようにプライマリピストン18の径方向に対して傾斜している。このため、区画シール52がプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動しても内周リップ部102が壁部90の斜面部90bに当接し難くできる。
The circumferential groove 33 is inclined with respect to the radial direction of the primary piston 18 so that the groove opening 87 side of the wall portion 90 on the cylinder bottom side increases in diameter as it approaches the partition seal 52. For this reason, even if the partition seal 52 is sucked toward the primary supply path 48 and moves toward the wall portion 90 in the circumferential groove 33, the inner peripheral lip portion 102 can hardly be brought into contact with the inclined surface portion 90 b of the wall portion 90.
区画シール52は、内周リップ部102の先端部111に形成された通路としての径方向溝112の周方向位置と、外周リップ部103の先端部121に形成された通路としての径方向溝122の周方向位置とが重なっている。このため、区画シール52がプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動した際に、内周リップ部102の先端部111と外周リップ部103の先端部121とが当接することがあっても、径方向溝112および径方向溝122の連通が遮断されてしまうことを抑制できる。よって、区画シール52と壁部90との間が全周にわたって密封状態となることをさらに抑制することができる。
The partition seal 52 includes a circumferential position of the radial groove 112 as a passage formed in the distal end portion 111 of the inner peripheral lip portion 102 and a radial groove 122 as a passage formed in the distal end portion 121 of the outer peripheral lip portion 103. The position in the circumferential direction overlaps. For this reason, when the partition seal 52 is sucked toward the primary supply path 48 and moved to the wall 90 side in the circumferential groove 33, the distal end portion 111 of the inner peripheral lip portion 102 and the distal end portion 121 of the outer peripheral lip portion 103 Even if they come into contact with each other, it is possible to prevent the communication between the radial groove 112 and the radial groove 122 from being blocked. Therefore, it can further be suppressed that the space between the partition seal 52 and the wall 90 is in a sealed state over the entire circumference.
なお、径方向溝122は、外周リップ部103が周溝33内で最大に変形しても外周リップ部103の内周側と外周側とを連通可能な大きさに設定されている。同様に径方向溝112は、内周リップ部102が周溝33内で最大に変形しても内周リップ部102の内周側と外周側とを連通可能な大きさに設定されている。
Note that the radial groove 122 is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 even when the outer peripheral lip 103 is deformed to the maximum in the peripheral groove 33. Similarly, the radial groove 112 is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the inner peripheral lip 102 even when the inner peripheral lip 102 is deformed to the maximum in the peripheral groove 33.
[第2実施形態]
次に、本発明に係る第2実施形態を主に図7に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。 [Second Embodiment]
Next, a second embodiment according to the present invention will be described mainly with reference to FIG. 7 with a focus on 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.
次に、本発明に係る第2実施形態を主に図7に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。 [Second Embodiment]
Next, a second embodiment according to the present invention will be described mainly with reference to FIG. 7 with a focus on 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.
第2実施形態は、第1実施形態の区画シール52とは一部異なる区画シール52Aを有している。区画シール52Aは、第1実施形態の径方向溝112が先端部111に形成された内周リップ部102とは異なり、径方向溝112が形成されていない先端部111Aを有する内周リップ部102Aを備えている。
The second embodiment has a partition seal 52A that is partially different from the partition seal 52 of the first embodiment. Unlike the inner peripheral lip portion 102 in which the radial groove 112 of the first embodiment is formed in the distal end portion 111, the partition seal 52A has an inner peripheral lip portion 102A having a distal end portion 111A in which the radial groove 112 is not formed. It has.
また、第2実施形態は、第1実施形態のシリンダ本体15とは一部異なるシリンダ本体15Aを有している。第2実施形態のシリンダ本体15Aは、第1実施形態の摺動内径部29に対して、周溝33と開口溝47との間の部分に、最小内径面29aよりもシリンダ径方向の外方に凹むリセス151Aが形成された点が異なる摺動内径部29Aを有している。リセス151Aは、周溝33と開口溝47とをシリンダ軸方向に連通させており、周溝33の斜面部90bをシリンダ径方向に横断している。
Further, the second embodiment has a cylinder body 15A that is partially different from the cylinder body 15 of the first embodiment. The cylinder main body 15A according to the second embodiment has an outer portion in the cylinder radial direction than the minimum inner diameter surface 29a at a portion between the circumferential groove 33 and the opening groove 47 with respect to the sliding inner diameter portion 29 of the first embodiment. It has a sliding inner diameter portion 29A which is different in that a recess 151A is formed. The recess 151A allows the circumferential groove 33 and the opening groove 47 to communicate with each other in the cylinder axial direction, and crosses the inclined surface portion 90b of the circumferential groove 33 in the cylinder radial direction.
第2実施形態では、区画シール52Aの外周リップ部103の先端部121に、第1実施形態と同様、外周リップ部103の内周側と外周側とを連通する通路となる径方向溝122が形成されている。よって、区画シール52Aがプライマリ補給路48側に吸引されて、周溝33内で壁部90側に移動して外周リップ部103が壁部90の壁面部90aに当接することがあっても、径方向溝122が外周リップ部103の先端部121と壁部90との間が全周にわたって密封状態となることを規制して、先端部121の溝底88側と溝開口87側とを連通させる。
In the second embodiment, a radial groove 122 serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip 103 is formed at the tip 121 of the outer peripheral lip 103 of the partition seal 52A, as in the first embodiment. Is formed. Therefore, even if the partition seal 52A is sucked toward the primary supply path 48 and moves to the wall 90 side in the circumferential groove 33, the outer peripheral lip 103 may come into contact with the wall surface 90a of the wall 90. The radial groove 122 regulates that the space between the tip portion 121 of the outer peripheral lip 103 and the wall portion 90 is in a sealed state over the entire circumference, and communicates the groove bottom 88 side and the groove opening 87 side of the tip portion 121. Let
また、第2実施形態では、区画シール52Aがプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動して内周リップ部102Aが壁部90の斜面部90bに当接することがあっても、リセス151Aが、内周リップ部102Aの先端部111Aと壁部90との間が全周にわたって密封状態となることを規制して、先端部111Aの溝底88側と溝開口87側とを連通させる。
In the second embodiment, the partition seal 52A is sucked toward the primary supply path 48 and moved toward the wall 90 in the circumferential groove 33 so that the inner peripheral lip 102A abuts against the inclined surface 90b of the wall 90. Even if this happens, the recess 151A regulates that the space between the tip portion 111A of the inner peripheral lip portion 102A and the wall portion 90 is sealed over the entire circumference, and the groove bottom 88 side of the tip portion 111A and the groove The opening 87 side is connected.
以上により、第2実施形態によっても、第1実施形態と同様、周溝33の溝底88と区画シール52Aの外周リップ部103との間に異物Fの混入があった場合に、シリンダ本体15の開口部16から、基部101と壁部89との隙間、異物Fによる外周リップ部103と溝底88との隙間、壁部90と径方向溝122との隙間、および、リセス151Aと先端部111Aとの隙間を介して、プライマリ補給路48側に空気が流れ、プライマリ補給路48側の負圧状態を大気圧に近づける。これにより、溝底88と外周リップ部103との間への異物Fの混入を良好に検出することができる。
As described above, according to the second embodiment, as in the first embodiment, when foreign matter F is mixed between the groove bottom 88 of the circumferential groove 33 and the outer peripheral lip 103 of the partition seal 52A, the cylinder body 15 From the opening 16, the gap between the base 101 and the wall 89, the gap between the outer peripheral lip 103 and the groove bottom 88 due to the foreign matter F, the gap between the wall 90 and the radial groove 122, and the recess 151A and the tip Air flows to the primary supply path 48 side through the gap with 111A, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103 can be detected well.
なお、リセス151Aは、内周リップ部102Aが周溝33内で最大に変形しても内周リップ部102Aの内周側と外周側とを連通可能な大きさに設定されている。
Note that the recess 151A is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the inner peripheral lip 102A even when the inner peripheral lip 102A is deformed to the maximum in the peripheral groove 33.
[第3実施形態]
次に、本発明に係る第3実施形態を主に図8に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。 [Third Embodiment]
Next, a third embodiment according to the present invention will be described mainly on the difference from the first embodiment based on FIG. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.
次に、本発明に係る第3実施形態を主に図8に基づいて第1実施形態との相違部分を中心に説明する。なお、第1実施形態と共通する部位については、同一称呼、同一の符号で表す。 [Third Embodiment]
Next, a third embodiment according to the present invention will be described mainly on the difference from the first embodiment based on FIG. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.
第3実施形態は、第1実施形態の区画シール52とは一部異なる区画シール52Bを有している。区画シール52Bは、第1実施形態の先端部121に径方向溝122が形成された外周リップ部103とは異なり、径方向溝122が形成されていない。区画シール52Bは、先端部121Bに径方向孔122B(通路)が形成された外周リップ部103Bを備えている。径方向孔122Bは、外周リップ部103Bの周方向に間隔をあけて複数形成されている。径方向孔122Bは、先端側外周面103dおよび先端側内周面103bに開口しており、先端面103eには開口していない。径方向孔122Bが外周リップ部103Bの内周側と外周側とを連通する通路となる。
The third embodiment has a partition seal 52B that is partially different from the partition seal 52 of the first embodiment. Unlike the outer peripheral lip portion 103 in which the radial groove 122 is formed in the distal end portion 121 of the first embodiment, the partition seal 52B does not have the radial groove 122 formed therein. The partition seal 52B includes an outer peripheral lip 103B in which a radial hole 122B (passage) is formed at the tip 121B. A plurality of radial holes 122B are formed at intervals in the circumferential direction of the outer peripheral lip 103B. The radial hole 122B opens to the distal end side outer peripheral surface 103d and the distal end side inner peripheral surface 103b, and does not open to the distal end surface 103e. The radial hole 122B serves as a passage that connects the inner peripheral side and the outer peripheral side of the outer peripheral lip 103B.
区画シール52Bは、第1実施形態の先端部111に径方向溝112が形成された内周リップ部102とは異なり、径方向溝112が形成されていない。区画シール52Bは、先端部111Bに径方向孔112B(通路)が形成された内周リップ部102Bを備えている。径方向孔112Bは、内周リップ部102Bの周方向に間隔をあけて複数形成されている。径方向孔112Bは、先端側外周面102bおよび先端側内周面102eに開口しており、先端面102fには開口していない。径方向孔112Bが内周リップ部102Bの内周側と外周側とを連通する通路となる。
Unlike the inner peripheral lip portion 102 in which the radial groove 112 is formed in the distal end portion 111 of the first embodiment, the partition seal 52B does not have the radial groove 112 formed therein. The partition seal 52B includes an inner peripheral lip portion 102B in which a radial hole 112B (passage) is formed in the distal end portion 111B. A plurality of radial holes 112B are formed at intervals in the circumferential direction of the inner peripheral lip portion 102B. The radial hole 112B opens in the distal end side outer peripheral surface 102b and the distal end side inner peripheral surface 102e, and does not open in the distal end surface 102f. The radial hole 112B serves as a passage that connects the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102B.
複数の径方向孔122Bは、それぞれが内周リップ部102Bの径方向孔112Bと一対一で区画シール52Bの周方向の位置、すなわち位相を合わせている。言い換えれば、区画シール52Bは、内周リップ部102Bの先端部111Bに形成された径方向孔112Bの周方向位置と、外周リップ部103Bの先端部121Bに形成された径方向孔122Bの周方向位置とが重なっている。
The plurality of radial holes 122B are in one-to-one correspondence with the radial holes 112B of the inner peripheral lip portion 102B, and the circumferential positions of the partition seals 52B, that is, the phases are matched. In other words, the partition seal 52B is positioned in the circumferential direction of the radial hole 112B formed in the distal end portion 111B of the inner peripheral lip portion 102B and in the circumferential direction of the radial hole 122B formed in the distal end portion 121B of the outer peripheral lip portion 103B. The position overlaps.
第3実施形態では、区画シール52Bの外周リップ部103Bの先端部121Bに、外周リップ部103Bの内周側と外周側とを連通する通路となる径方向孔122Bが形成されている。よって、区画シール52Bがプライマリ補給路48側に吸引されて、図8に示すように周溝33内で壁部90側に移動して外周リップ部103Bが壁部90の壁面部90aに当接することがあっても、径方向孔122Bが、先端部121Bの溝底88側と溝開口87側とを連通させる。
In the third embodiment, a radial hole 122B serving as a passage communicating the inner peripheral side and the outer peripheral side of the outer peripheral lip 103B is formed in the tip 121B of the outer peripheral lip 103B of the partition seal 52B. Therefore, the partition seal 52B is sucked toward the primary supply path 48 and moves to the wall 90 side in the circumferential groove 33 as shown in FIG. 8 so that the outer peripheral lip 103B contacts the wall 90a of the wall 90. Even if this occurs, the radial hole 122B allows the groove bottom 88 side and the groove opening 87 side of the tip 121B to communicate with each other.
また、第3実施形態では、区画シール52Bの内周リップ部102Bの先端部111Bにも、内周リップ部102Bの内周側と外周側とを連通する通路となる径方向孔112Bが形成されている。よって、区画シール52Bがプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動して内周リップ部102Bが壁部90の斜面部90bに当接することがあっても、径方向孔112Bが、先端部111Bの溝底88側と溝開口87側とを連通させる。
In the third embodiment, a radial hole 112B serving as a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102B is also formed at the tip 111B of the inner peripheral lip portion 102B of the partition seal 52B. ing. Therefore, even if the partition seal 52B is sucked toward the primary supply path 48 and moves toward the wall 90 in the circumferential groove 33, the inner peripheral lip 102B may come into contact with the inclined surface 90b of the wall 90. The radial hole 112B allows the groove bottom 88 side and the groove opening 87 side of the tip end portion 111B to communicate with each other.
以上により、第3実施形態によっても、第1実施形態と同様、周溝33の溝底88と区画シール52Bの外周リップ部103Bとの間に異物Fの混入があった場合に、シリンダ本体15の開口部16から、基部101と壁部89との隙間、異物Fによる外周リップ部103Bと溝底88との隙間、径方向孔122B、および、径方向孔112Bを介して、プライマリ補給路48側に空気が流れ、プライマリ補給路48側の負圧状態を大気圧に近づける。これにより、溝底88と外周リップ部103Bとの間への異物Fの混入を良好に検出することができる。
As described above, according to the third embodiment, as in the first embodiment, when foreign matter F is mixed between the groove bottom 88 of the circumferential groove 33 and the outer peripheral lip 103B of the partition seal 52B, the cylinder body 15 Primary replenishment path 48 through the gap 16 between the base 101 and the wall 89, the gap between the outer peripheral lip 103B and the groove bottom 88 due to the foreign matter F, the radial hole 122B, and the radial hole 112B. Air flows to the side, and the negative pressure state on the primary supply path 48 side is brought close to atmospheric pressure. Thereby, mixing of the foreign material F between the groove bottom 88 and the outer peripheral lip 103B can be detected well.
区画シール52Bの外周リップ部103Bの内周側と外周側とを連通する通路として、外周リップ部103Bの先端部121Bに径方向孔122Bが形成される構造である。このため、先端部121Bの耐久性低下を抑制することができる。
As a passage that connects the inner peripheral side and the outer peripheral side of the outer peripheral lip 103B of the partition seal 52B, a radial hole 122B is formed in the tip 121B of the outer peripheral lip 103B. For this reason, the durability fall of the front-end | tip part 121B can be suppressed.
区画シール52Bの内周リップ部102Bの内周側と外周側とを連通する通路として、内周リップ部102Bの先端部111Bに径方向孔112Bが形成される構造である。このため、先端部111Bの耐久性低下を抑制することができる。
As a passage that connects the inner peripheral side and the outer peripheral side of the inner peripheral lip portion 102B of the partition seal 52B, a radial hole 112B is formed in the tip portion 111B of the inner peripheral lip portion 102B. For this reason, the durability fall of the front-end | tip part 111B can be suppressed.
区画シール52Bは、内周リップ部102Bの先端部111Bに形成された通路としての径方向孔112Bの周方向位置と、外周リップ部103Bの先端部121Bに形成された通路としての径方向孔122Bの周方向位置とが重なっている。このため、区画シール52Bがプライマリ補給路48側に吸引されて周溝33内で壁部90側に移動した際に、内周リップ部102Bの先端部111Bと外周リップ部103Bの先端部121Bとが当接することがあっても、径方向孔112Bおよび径方向孔122Bの連通が遮断されてしまうことを抑制できる。
The partition seal 52B includes a circumferential position of a radial hole 112B as a passage formed in the distal end portion 111B of the inner peripheral lip portion 102B and a radial hole 122B as a passage formed in the distal end portion 121B of the outer peripheral lip portion 103B. The position in the circumferential direction overlaps. For this reason, when the partition seal 52B is sucked to the primary supply path 48 side and moved to the wall 90 side in the circumferential groove 33, the distal end portion 111B of the inner peripheral lip portion 102B and the distal end portion 121B of the outer peripheral lip portion 103B Even if they come into contact with each other, it is possible to prevent the communication between the radial hole 112B and the radial hole 122B from being blocked.
なお、径方向孔122Bは、外周リップ部103Bが周溝33内で最大に変形しても先端部121Bの内周側と外周側とを連通可能な大きさに設定されている。同様に径方向孔112Bは、内周リップ部102Bが周溝33内で最大に変形しても先端部111Bの内周側と外周側とを連通可能な大きさに設定されている。
It should be noted that the radial hole 122B is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the tip 121B even when the outer peripheral lip 103B is deformed to the maximum in the peripheral groove 33. Similarly, the radial hole 112B is set to a size that allows communication between the inner peripheral side and the outer peripheral side of the distal end portion 111B even when the inner peripheral lip portion 102B is deformed to the maximum in the peripheral groove 33.
ここで、第3実施形態の先端部121Bに径方向孔122Bを有する外周リップ部103Bと、第2実施形態の先端部111Aに通路がない内周リップ部102Aとを有する区画シールと、第2実施形態のリセス151Aを有するシリンダ本体15Aとを組み合わせても良い。また、第3実施形態の先端部121Bに径方向孔122Bを有する外周リップ部103Bと、第1実施形態の先端部111に径方向溝112を有する内周リップ部102とを有する区画シールとしても良い。さらに、第3実施形態の先端部111Bに径方向孔112Bを有する内周リップ部102Bと、第1実施形態の先端部121に径方向溝122を有する外周リップ部103とを有する区画シールとしても良い。
Here, a partition seal having an outer peripheral lip portion 103B having a radial hole 122B in the distal end portion 121B of the third embodiment and an inner peripheral lip portion 102A having no passage in the distal end portion 111A of the second embodiment, You may combine with cylinder main body 15A which has recess 151A of embodiment. Further, as a partition seal having an outer peripheral lip portion 103B having a radial hole 122B in the distal end portion 121B of the third embodiment and an inner peripheral lip portion 102 having a radial groove 112 in the distal end portion 111 of the first embodiment. good. Further, as a partition seal having an inner peripheral lip portion 102B having a radial hole 112B in the distal end portion 111B of the third embodiment and an outer peripheral lip portion 103 having a radial groove 122 in the distal end portion 121 of the first embodiment. good.
以上の実施形態の第1の態様によれば、マスタシリンダは、ブレーキ液の吐出路とリザーバに連通する補給路とを有する有底筒状のシリンダ本体と、該シリンダ本体内に移動可能に配設され、該シリンダ本体との間に前記吐出路へ液圧を供給する圧力室を形成するピストンと、前記シリンダ本体の内周面に開口して形成される周溝内に配置され、内周が前記ピストンに摺接して前記補給路と前記シリンダ本体の外部とを画成するシールと、を備える。前記シールは、円環状の基部から突出する、前記ピストンの外周面に摺接する内周リップ部および前記シリンダ本体の前記周溝に当接する外周リップ部を有する。前記外周リップ部には、先端部に該外周リップ部の内周側と外周側とを連通する通路が形成されている。これにより、周溝の溝底と外周リップ部との間への異物の混入を良好に検出することができ、品質を向上することが可能となる。
According to the first aspect of the above embodiment, the master cylinder has a bottomed cylindrical cylinder body having a brake fluid discharge path and a supply path communicating with the reservoir, and is movably disposed in the cylinder body. And a piston that forms a pressure chamber that supplies hydraulic pressure to the discharge passage between the cylinder body and a circumferential groove that opens to the inner circumferential surface of the cylinder body, Includes a seal that is in sliding contact with the piston to define the replenishment path and the outside of the cylinder body. The seal includes an inner peripheral lip portion that protrudes from an annular base portion and slidably contacts the outer peripheral surface of the piston, and an outer peripheral lip portion that contacts the peripheral groove of the cylinder body. The outer peripheral lip portion is formed with a passage communicating with the inner peripheral side and the outer peripheral side of the outer peripheral lip portion at the distal end portion. As a result, it is possible to satisfactorily detect the mixing of foreign matter between the groove bottom of the peripheral groove and the outer peripheral lip portion, and the quality can be improved.
第2の態様は、上記第1の態様において、前記外周リップ部の前記通路は、先端部に形成された径方向溝である。
A second aspect is the above-described first aspect, wherein the passage of the outer peripheral lip portion is a radial groove formed at a tip portion.
第3の態様は、上記第1の態様において、前記外周リップ部の前記通路は、径方向孔である。
In a third aspect according to the first aspect, the passage of the outer peripheral lip portion is a radial hole.
第4の態様は、上記第1乃至第3のいずれか一態様において、前記周溝は、前記シリンダ本体の底部側の壁部の開口側が、前記シールに近づくにつれて拡径するように前記ピストンの径方向に対して傾斜している。
According to a fourth aspect, in any one of the first to third aspects, the circumferential groove has a diameter that increases as the opening side of the wall portion on the bottom side of the cylinder main body approaches the seal. It is inclined with respect to the radial direction.
第5の態様は、上記第1乃至第3のいずれか一態様において、前記内周リップ部は、先端部に該内周リップ部の内周側と外周側とを連通する通路が形成されている。
In a fifth aspect according to any one of the first to third aspects, the inner peripheral lip portion is formed with a passage communicating with an inner peripheral side and an outer peripheral side of the inner peripheral lip portion at a tip portion. Yes.
第6の態様は、上記第5の態様において、前記シールは、前記内周リップ部の先端部に形成された前記通路の周方向位置と、前記外周リップ部の先端部に形成された前記通路の周方向位置とが重なっている。
According to a sixth aspect, in the fifth aspect, the seal is formed in a circumferential position of the passage formed at a distal end portion of the inner peripheral lip portion and the passage formed at a distal end portion of the outer peripheral lip portion. The position in the circumferential direction overlaps.
上記したマスタシリンダによれば、品質を向上することが可能となる。
According to the master cylinder described above, the quality can be improved.
11 マスタシリンダ
12 リザーバ
15 シリンダ本体
15a 内周面
18 プライマリピストン(ピストン)
27 プライマリ吐出路(吐出路)
33 周溝
48 プライマリ補給路(補給路)
52 区画シール(シール)
85 プライマリ圧力室(圧力室)
87 溝開口(開口)
90 壁部
90b 斜面部
101 基部
102 内周リップ部
103 外周リップ部
111 先端部(内周リップ部の先端部)
112 径方向溝(内周リップ部の通路)
112B 径方向孔(内周リップ部の通路)
121 先端部(外周リップ部の先端部)
122 径方向溝(外周リップ部の通路)
122B 径方向孔(外周リップ部の通路) 11Master cylinder 12 Reservoir 15 Cylinder body 15a Inner circumferential surface 18 Primary piston (piston)
27 Primary discharge path (discharge path)
33Circumferential groove 48 Primary supply path (supply path)
52 division seal (seal)
85 Primary pressure chamber (pressure chamber)
87 Groove opening (opening)
90Wall portion 90b Slope portion 101 Base portion 102 Inner peripheral lip portion 103 Outer peripheral lip portion 111 Tip portion (tip portion of inner peripheral lip portion)
112 radial groove (passage of inner lip)
112B radial hole (passage of inner lip)
121 Tip (tip of outer lip)
122 radial groove (passage of outer lip)
122B radial hole (passage of outer lip)
12 リザーバ
15 シリンダ本体
15a 内周面
18 プライマリピストン(ピストン)
27 プライマリ吐出路(吐出路)
33 周溝
48 プライマリ補給路(補給路)
52 区画シール(シール)
85 プライマリ圧力室(圧力室)
87 溝開口(開口)
90 壁部
90b 斜面部
101 基部
102 内周リップ部
103 外周リップ部
111 先端部(内周リップ部の先端部)
112 径方向溝(内周リップ部の通路)
112B 径方向孔(内周リップ部の通路)
121 先端部(外周リップ部の先端部)
122 径方向溝(外周リップ部の通路)
122B 径方向孔(外周リップ部の通路) 11
27 Primary discharge path (discharge path)
33
52 division seal (seal)
85 Primary pressure chamber (pressure chamber)
87 Groove opening (opening)
90
112 radial groove (passage of inner lip)
112B radial hole (passage of inner lip)
121 Tip (tip of outer lip)
122 radial groove (passage of outer lip)
122B radial hole (passage of outer lip)
Claims (6)
- ブレーキ液の吐出路とリザーバに連通する補給路とを有する有底筒状のシリンダ本体と、
該シリンダ本体内に移動可能に配設され、該シリンダ本体との間に前記吐出路へ液圧を供給する圧力室を形成するピストンと、
前記シリンダ本体の内周面に開口して形成される周溝内に配置され、内周が前記ピストンに摺接して前記補給路と前記シリンダ本体の外部とを画成するシールと、を備え、
前記シールは、円環状の基部から突出する、前記ピストンの外周面に摺接する内周リップ部および前記シリンダ本体の前記周溝に当接する外周リップ部を有し、
前記外周リップ部には、先端部に該外周リップ部の内周側と外周側とを連通する通路が形成されている
マスタシリンダ。 A bottomed cylindrical cylinder body having a brake fluid discharge path and a supply path communicating with the reservoir;
A piston which is movably disposed in the cylinder body and forms a pressure chamber between which the fluid pressure is supplied to the discharge passage;
A seal that is disposed in a circumferential groove that is formed by opening in the inner peripheral surface of the cylinder body, the inner circumference slidingly contacts the piston, and defines the supply path and the outside of the cylinder body;
The seal has an inner peripheral lip portion that protrudes from an annular base portion and slidably contacts the outer peripheral surface of the piston, and an outer peripheral lip portion that contacts the peripheral groove of the cylinder body,
The outer peripheral lip portion is formed with a passage communicating with an inner peripheral side and an outer peripheral side of the outer peripheral lip portion at a tip portion. - 前記外周リップ部の前記通路は、先端部に形成された径方向溝である
請求項1記載のマスタシリンダ。 The master cylinder according to claim 1, wherein the passage of the outer peripheral lip portion is a radial groove formed at a distal end portion. - 前記外周リップ部の前記通路は、径方向孔である
請求項1記載のマスタシリンダ。 The master cylinder according to claim 1, wherein the passage of the outer peripheral lip portion is a radial hole. - 前記周溝は、前記シリンダ本体の底部側の壁部の開口側が、前記シールに近づくにつれて拡径するように前記ピストンの径方向に対して傾斜している
請求項1乃至3のいずれか一項記載のマスタシリンダ。 The circumferential groove is inclined with respect to the radial direction of the piston so that the opening side of the wall portion on the bottom side of the cylinder body increases in diameter as it approaches the seal. The master cylinder described. - 前記内周リップ部は、先端部に該内周リップ部の内周側と外周側とを連通する通路が形成されている
請求項1乃至3のいずれか一項記載のマスタシリンダ。 The master cylinder according to any one of claims 1 to 3, wherein the inner peripheral lip portion has a leading end formed with a passage communicating the inner peripheral side and the outer peripheral side of the inner peripheral lip portion. - 前記シールは、前記内周リップ部の先端部に形成された前記通路の周方向位置と、前記外周リップ部の先端部に形成された前記通路の周方向位置とが重なっている
請求項5記載のマスタシリンダ。 6. The seal includes a circumferential position of the passage formed at a distal end portion of the inner peripheral lip portion and a circumferential position of the passage formed at a distal end portion of the outer peripheral lip portion. Master cylinder.
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JP2020521842A JP7034276B2 (en) | 2018-05-29 | 2019-05-15 | Master cylinder |
CN201980035911.9A CN112203912B (en) | 2018-05-29 | 2019-05-15 | Master cylinder |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56127465U (en) * | 1980-02-29 | 1981-09-28 | ||
JP2011240723A (en) * | 2010-05-14 | 2011-12-01 | Bosch Corp | Master cylinder and brake system using the same |
JP2013237370A (en) * | 2012-05-16 | 2013-11-28 | Nissin Kogyo Co Ltd | Cylinder device |
JP2014501659A (en) * | 2010-12-17 | 2014-01-23 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | How to detect installation error of hermetic seal on master cylinder |
JP2015137729A (en) * | 2014-01-23 | 2015-07-30 | Nok株式会社 | Sealing device and manufacturing method of sealing device |
Family Cites Families (2)
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JP4417233B2 (en) * | 2004-09-30 | 2010-02-17 | 日立オートモティブシステムズ株式会社 | Master cylinder |
US10183657B2 (en) * | 2013-01-31 | 2019-01-22 | Hitachi Automotive Systems, Ltd. | Master cylinder |
-
2019
- 2019-05-15 CN CN201980035911.9A patent/CN112203912B/en active Active
- 2019-05-15 JP JP2020521842A patent/JP7034276B2/en active Active
- 2019-05-15 WO PCT/JP2019/019319 patent/WO2019230400A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56127465U (en) * | 1980-02-29 | 1981-09-28 | ||
JP2011240723A (en) * | 2010-05-14 | 2011-12-01 | Bosch Corp | Master cylinder and brake system using the same |
JP2014501659A (en) * | 2010-12-17 | 2014-01-23 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | How to detect installation error of hermetic seal on master cylinder |
JP2013237370A (en) * | 2012-05-16 | 2013-11-28 | Nissin Kogyo Co Ltd | Cylinder device |
JP2015137729A (en) * | 2014-01-23 | 2015-07-30 | Nok株式会社 | Sealing device and manufacturing method of sealing device |
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CN112203912A (en) | 2021-01-08 |
CN112203912B (en) | 2023-04-14 |
JP7034276B2 (en) | 2022-03-11 |
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