WO2014119611A1 - マスタシリンダ - Google Patents
マスタシリンダ Download PDFInfo
- Publication number
- WO2014119611A1 WO2014119611A1 PCT/JP2014/051932 JP2014051932W WO2014119611A1 WO 2014119611 A1 WO2014119611 A1 WO 2014119611A1 JP 2014051932 W JP2014051932 W JP 2014051932W WO 2014119611 A1 WO2014119611 A1 WO 2014119611A1
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- WIPO (PCT)
- Prior art keywords
- cylinder
- piston
- diameter
- outer peripheral
- 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
- B60T11/236—Piston sealing arrangements
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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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- 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
- B60T11/20—Tandem, side-by-side, or other multiple master cylinder units
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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
- B60T11/232—Recuperation valves
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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
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/001—One-piece pistons
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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
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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
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
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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
Definitions
- the present invention relates to a master cylinder that supplies hydraulic pressure to a brake cylinder of a vehicle.
- Some master cylinders are provided with a spacer ring on the back of the cup seal by bonding or uneven fitting (see, for example, Patent Document 1).
- the piston seal seals the flow of brake fluid from the inside to the reservoir side.
- the piston seal allows the flow of the brake fluid from the reservoir side to the inside, the brake fluid is supplied from the reservoir side to the inside. In this case, if the posture of the piston seal is not stable, smooth supply may be hindered.
- the present invention provides a master cylinder capable of stabilizing the posture of the piston seal.
- the master cylinder is provided with 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 peripheral groove that is provided in a circumferential groove formed in the cylinder body, and the inner circumference is in sliding contact with the piston.
- a piston seal that seals between the pressure chamber and the pressure chamber.
- the piston seal has an annular base portion in which an inner peripheral lip portion that is in sliding contact with the outer peripheral surface of the piston and an outer peripheral lip portion that is in contact with the peripheral groove of the cylinder main body are protruded.
- a stepped portion having a larger axial length on the inner peripheral side is formed on the outer peripheral side of the base portion.
- a step portion is formed in which the outer peripheral surface of the step portion always abuts.
- a communication path is provided between the stepped portion and the stepped portion to communicate the supply path and the bottom side of the circumferential groove.
- the piston seal further includes an intermediate projecting portion that projects from between the inner peripheral lip portion and the outer peripheral lip portion of the base portion to beyond the outer peripheral lip portion.
- an intermediate projecting portion that projects from between the inner peripheral lip portion and the outer peripheral lip portion of the base portion to beyond the outer peripheral lip portion.
- another stepped portion with which the outer peripheral surface of the intermediate projecting portion abuts is formed.
- a plurality of communicating portions are formed on the distal end side of the intermediate projecting portion so as to be spaced apart from each other in the circumferential direction and communicate the bottom side of the circumferential groove and the pressure chamber.
- the inner peripheral lip portion bends in a direction approaching the intermediate projecting portion according to a pressure state between the pressure chamber and the supply passage, and the supply passage and the pressure chamber are bent. Communicate with.
- the piston seal has an inner peripheral surface of the base portion of the piston in a basic state that is a non-braking state before a brake pedal for moving the piston is operated. It is formed so as to be separated from the outer peripheral surface.
- a notch portion in which the axial length of the stepped portion is larger on the outer peripheral side than on the inner peripheral side is formed on the inner peripheral side of the base portion.
- the posture of the piston seal can be stabilized.
- FIG. 3B is a cross-sectional view taken along the line AA in FIG. 3A showing the piston seal of the master cylinder of the first embodiment.
- FIGS. 1 to 6B A first embodiment according to the present invention will be described with reference to FIGS. 1 to 6B.
- a force corresponding to an operation amount of a brake pedal (not shown) is introduced via 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 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 arranged 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 metal cylinder body 15.
- the cylinder body 15 is formed by processing a single material into a bottomed cylinder having a bottom 13 and a cylinder 14.
- the cylinder body 15 is disposed on the vehicle in a posture in which the axial direction is along the vehicle front-rear direction.
- a metal primary piston (piston) 18 is movably disposed on the opening 16 side of the cylinder body 15.
- a metal secondary piston (piston) 19 is movably disposed closer to the bottom 13 side than the primary piston 18 of 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 the two pistons 18 and 19 as described above.
- the present embodiment is not limited to the application to the tandem type master cylinder. If the plunger type master cylinder is used, a single type master cylinder in which one piston is arranged in the cylinder body, or three
- the present invention can be applied to any plunger type master cylinder such as a master cylinder having the above piston.
- 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) at a predetermined position in the circumferential direction of the cylindrical portion 14 (hereinafter referred to as the cylinder circumferential direction).
- the cylinder circumferential direction is integrally formed.
- Mounting holes 24 and 25 for mounting the reservoir 12 are formed in the mounting base portion 23.
- the mounting holes 24 and 25 are shifted in position in the axial direction (hereinafter referred to as the cylinder axis) of the cylindrical portion 14 of the cylinder body 15 in a state where the positions in the cylinder circumferential direction coincide with each other. It is formed at the top in the vertical direction.
- a secondary discharge passage (discharge passage) 26 is formed in the vicinity of the bottom portion 13 on the mounting base portion 23 side of the cylinder portion 14 of the cylinder body 15.
- a primary discharge path (discharge path) 27 is formed on the opening 16 side of the cylinder body 15 with respect to the secondary discharge path 26.
- 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 passage 26 and the primary discharge passage 27 are formed by shifting the positions in the cylinder axial direction in a state where the positions in the cylinder circumferential direction coincide with each other.
- the secondary piston 19 is slidably guided to a sliding inner diameter portion 28 formed on the inner peripheral portion on the bottom 13 side of the cylinder portion 14 of the cylinder body 15.
- the primary piston 18 is slidably guided to a sliding inner diameter portion 29 formed on the inner peripheral portion on the opening portion 16 side of the cylindrical portion 14 of the cylinder body 15.
- the sliding inner diameter portion 28 is formed with a plurality of circumferential grooves 30 and a circumferential groove 31 that are formed in this order from the bottom 13 side by shifting the position in the cylinder axial direction to form an annular shape.
- the sliding inner diameter portion 29 is also formed with a circumferential groove 32 and a circumferential groove 33, each of which has an annular shape by shifting the position in the cylinder axial direction, in this order from the bottom 13 side.
- two circumferential grooves 32 and circumferential grooves 33 are formed.
- These circumferential grooves 30 to 33 have an annular shape in the cylinder circumferential direction and are recessed outward in the cylinder radial direction.
- the circumferential grooves 30 to 33 are all formed by cutting.
- the circumferential groove 30 on the most bottom 13 side is formed in the vicinity of the mounting hole 24 on the bottom 13 side of the mounting holes 24 and 25.
- An annular piston seal 35 is disposed in the circumferential groove 30 so as to be held in the circumferential groove 30.
- the cylinder diameter is such that a communication hole 36 formed from the mounting hole 24 on the bottom portion 13 side is opened in the cylindrical portion 14 on the opening portion 16 side of the sliding inner diameter portion 28 of the cylinder body 15 on the opening portion 16 side.
- An annular opening groove 37 that is recessed outward in the direction is formed.
- the opening groove 37 and the communication hole 36 constitute a secondary supply path (supply path) 38 provided in the cylinder body 15 and always communicating with the reservoir 12.
- a communication groove 41 is formed on the bottom 13 side of the circumferential groove 30 of the sliding inner diameter portion 28 of the cylinder body 15.
- the communication groove 41 is formed so as to open to the circumferential groove 30 and linearly extend from the circumferential groove 30 in the cylinder axial direction toward the bottom 13 and to be recessed outward in the cylinder radial direction.
- 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 in the sliding inner diameter portion 28 of the cylinder body 15, that is, on the opening 16 side of the cylinder body 15.
- An annular partition seal 42 held in the circumferential groove 31 is disposed in the circumferential groove 31.
- the circumferential groove 32 is formed in the vicinity of the mounting hole 25 on the opening 16 side in the sliding inner diameter portion 29 of the cylinder body 15.
- An annular piston seal 45 held in the circumferential groove 32 is disposed in the circumferential groove 32.
- An opening groove 47 is formed on the opening 16 side of the circumferential groove 32 in the sliding inner diameter portion 29 of the cylinder body 15.
- the opening groove 47 is formed in an annular shape that is open outwardly in the cylinder radial direction by opening a communication hole 46 drilled from the mounting hole 25 on the opening 16 side into the cylindrical portion 14.
- the opening groove 47 and the communication hole 46 mainly constitute a primary supply path (supply path) 48 provided in the cylinder body 15 and always communicating with the reservoir 12.
- a communication groove 51 is formed on the bottom 13 side of the circumferential groove 32 of the sliding inner diameter portion 29 of the cylinder body 15.
- the communication groove 51 is formed so as to open to the circumferential groove 32 and to extend linearly from the circumferential groove 32 in the cylinder axial direction toward the bottom 13 and to be recessed outward in the cylinder radial direction.
- the communication groove 51 communicates the primary discharge passage 27 formed at a position near the circumferential groove 31 and the circumferential groove 32 via a primary pressure chamber 85 described later.
- the circumferential groove 33 is formed on the side of the sliding inner diameter portion 29 of the cylinder body 15 opposite to the circumferential groove 32 of the opening groove 47, that is, on the opening portion 16 side of the cylinder body 15.
- An annular partition seal 52 is disposed in the circumferential groove 33 so as to be held in the circumferential groove 33.
- the secondary piston 19 fitted to the bottom 13 side of the cylinder body 15 has a bottomed cylindrical shape having a cylindrical portion 55 and a bottom portion 56 formed on one side in the axial direction of the cylindrical portion 55. .
- the inner peripheral hole 22 is formed by the cylindrical portion 55 and the bottom portion 56.
- the secondary piston 19 is slid on the inner periphery 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 with the cylindrical portion 55 disposed on the bottom 13 side of the cylinder body 15. It is movably fitted.
- An annular step portion 59 is formed on the outer peripheral portion on the end side opposite to the bottom portion 56 of the cylindrical portion 55.
- the step portion 59 is formed in a step shape so as to be positioned radially inward from the outermost surface 58 having the largest diameter in the secondary piston 19.
- a plurality of ports 60 penetrating in the cylinder radial direction are formed on the bottom 56 side so as to be radially formed at equal intervals in the cylinder circumferential direction.
- the step portion 59 is not necessarily formed, and the outer peripheral surface of the secondary piston 19 may have a constant outer diameter. It is not always necessary to form a plurality of ports 60. One or more ports 60 may be formed. When a plurality of ports 60 are formed, it is not always necessary to form them at equal intervals in the cylinder circumferential direction.
- the interval adjusting unit 63 includes a secondary piston spring 62 that determines an interval between the secondary piston 19 and the bottom portion 13 of the cylinder body 15 in a non-braking state where there is no input from a brake pedal (not shown) (right side in FIG. 1). ing.
- the gap adjusting portion 63 is a locking member 64 that is in contact with the bottom portion 13 of the cylinder body 15, and a member that is connected to the locking member 64 so as to slide within a predetermined range and is in contact with the bottom portion 56 of the secondary piston 19. And a stop member 65.
- the secondary piston spring 62 is interposed between the locking members 64 and 65 on both sides.
- a portion formed by being surrounded by the bottom portion 13 of the cylinder body 15 and the bottom portion 13 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.
- a secondary pressure chamber (pressure chamber) 68 is formed.
- 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 is configured to communicate with the secondary supply path 38, that is, the reservoir 12 when the secondary piston 19 is in a position where the port 60 is opened in the opening groove 37.
- the partition seal 42 held in the circumferential groove 31 of the cylinder body 15 is an integrally molded product made of synthetic rubber.
- the partition seal 42 has a C-shaped shape on one side of the radial cross section including the center line.
- the partition seal 42 is in sliding contact with the outer periphery of the secondary piston 19 that moves in the cylinder axial direction, and the outer periphery abuts against the circumferential groove 31 of the cylinder body 15 so that the partition seal 42 of the secondary piston 19 and the cylinder body 15 Always seal position gaps.
- the piston seal 35 held in the circumferential groove 30 of the cylinder body 15 is an integrally molded product made of synthetic rubber such as EPDM.
- the piston seal 35 is in sliding contact with the outer periphery of the secondary piston 19 whose inner periphery moves in the cylinder axial direction.
- the piston seal 35 is configured such that the outer periphery thereof is in contact with the circumferential groove 30 of the cylinder body 15.
- the piston seal 35 is configured to be able to seal between the secondary supply path 38 and the secondary pressure chamber 68 in a state where the secondary piston 19 positions the port 60 on the bottom 13 side of the piston seal 35. That is, the piston seal 35 can block 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 bottom 13 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 fitted to the opening 16 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 portion of the bottom portion 72. It has a shape having a second cylindrical portion 73 formed on the opposite side to the first cylindrical portion 71.
- the inner peripheral hole 21 is formed by a first cylindrical portion 71 and a bottom portion 72.
- 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.
- the output shaft of a brake booster is arrange
- An annular step portion 75 is formed on the outer peripheral portion on the end side opposite to the bottom portion 72 of the first cylindrical portion 71.
- the stepped portion 75 is formed in a stepped shape so as to be located radially inward from the outermost surface 74 having the largest diameter in the primary piston 18.
- the step portion 75 is formed with a plurality of ports 76 penetrating in the radial direction on the bottom portion 72 side so as to be radially arranged at equal intervals in the cylinder circumferential direction.
- the step 75 is not necessarily formed, and the outer peripheral surface of the primary piston 18 may have a constant outer diameter. It is not always necessary to form a plurality of ports 76. One or more ports 76 may be formed. When a plurality of ports 76 are formed, it is not always necessary to form them at equal intervals in the cylinder circumferential direction.
- the interval adjusting unit 79 includes a primary piston spring 78 that determines these intervals in a non-braking state in which there is no input from a brake pedal side (the right side in FIG. 1) (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.
- a shaft member 83 that slidably supports the stop member 82 within a predetermined range.
- the primary piston spring 78 is interposed between the locking members 81 and 82 on both sides.
- a portion surrounded by the cylinder portion 14 of the cylinder body 15, the primary piston 18 and the secondary piston 19 generates a brake fluid pressure and supplies a brake fluid to the primary discharge passage 27 (primary pressure chamber ( Pressure chamber) 85.
- 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 where the port 76 is opened to the opening groove 47.
- the partition seal 52 held in the circumferential groove 33 of the cylinder body 15 is the same component as the partition seal 42 and is an integrally molded product made of synthetic rubber.
- the partition seal 52 has a C-shaped shape on one side of the radial cross section including the center line.
- the partition seal 52 is in sliding contact with the outer periphery of the primary piston 18 that moves in the cylinder axis direction, and the outer periphery abuts on the circumferential groove 33 of the cylinder body 15 so that the partition seal 52 of the primary piston 18 and the cylinder body 15 Always seal position gaps.
- the piston seal 45 held in the circumferential groove 32 of the cylinder body 15 is the same component as the piston seal 35, and is an integrally molded product made of synthetic rubber such as EPDM.
- the piston seal 45 is in sliding contact with the outer periphery of the primary piston 18 whose inner periphery moves in the cylinder axial direction.
- the piston seal 45 is configured such that the outer periphery thereof is in contact with the circumferential groove 32 of the cylinder body 15.
- the piston seal 45 is configured to be able to seal between the primary supply path 48 and the primary pressure chamber 85 in a state where the primary piston 18 has the port 76 positioned on the bottom 13 side of the piston seal 45. That is, the piston seal 45 can block 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 on the cylinder body 15 and moves to the bottom 13 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 structure portion including the circumferential groove 30 of the cylinder body 15 and the vicinity thereof, the piston seal 35, and the sliding contact portion of the piston seal 35 of the secondary piston 19 is referred to as a secondary-side seal structure portion SS.
- a structure portion including the circumferential groove 32 of the cylinder body 15 and the vicinity thereof, the piston seal 45, and the sliding contact portion of the piston seal 45 of the primary piston 18 is referred to as a primary-side seal structure portion SP.
- the secondary-side seal structure SS and the primary-side seal structure SP have the same structure. Therefore, in the following, these details will be described with reference to FIGS. 2 to 6B, taking the seal structure SP on the primary side as an example.
- the circumferential groove 32 has a groove bottom portion (bottom portion of the circumferential groove 32) 88 located on the outermost side (the upper side in FIG. 2) in the cylinder radial direction.
- the circumferential groove 32 has a circumferential wall 89 that extends inward in the cylinder radial direction from the edge of the groove bottom portion 88 on the side of the opening 16 of the cylinder body 15 (the right side in FIG. 2; hereinafter referred to as the cylinder opening side).
- the circumferential groove 32 has a circumferential wall 90 that extends inward in the cylinder radial direction from an end edge of the groove bottom 88 on the bottom 13 side of the cylinder body 15 (left side in FIG.
- the groove bottom portion 88, the peripheral wall 89, and the peripheral wall 90 are formed integrally with the cylinder body 15.
- the groove bottom portion 88, the peripheral wall 89, and the peripheral wall 90 are formed by cutting the cylinder body 15.
- the groove bottom portion 88 has a groove bottom surface 88a.
- the groove bottom surface 88a forms an annular surface centered on the cylinder axis, and the length in the cylinder axis direction is constant.
- the peripheral wall 89 has a large-diameter wall surface 89a, an inner peripheral surface 89b, and a small-diameter wall surface 89c.
- the large-diameter wall surface 89a is formed of a flat surface on the groove bottom portion 88 side in the cylinder radial direction on the peripheral wall 89 and parallel to the orthogonal surface of the cylinder axis.
- the large-diameter wall surface 89a has a constant inner diameter and a constant outer diameter, a constant width in the cylinder radial direction, and has an annular shape centering on the cylinder axis.
- the inner peripheral surface 89b is on the inner side in the cylinder radial direction than the large-diameter wall surface 89a in the peripheral wall 89 and extends toward the cylinder opening side from the large-diameter wall surface 89a along the cylinder axial direction.
- the inner peripheral surface 89b is composed of an annular surface centered on the cylinder axis, and the length in the cylinder axis direction is constant.
- the small-diameter wall surface 89c is formed of a flat surface that is on the inner side in the cylinder radial direction than the inner peripheral surface 89b of the peripheral wall 89 and is parallel to the orthogonal surface of the cylinder axis.
- the small-diameter wall surface 89c also has a constant inner diameter and a constant outer diameter, a constant width in the cylinder radial direction, and has an annular shape centering on the cylinder axis.
- R chamfering is applied to the boundary position between the large diameter side of the large diameter wall surface 89a and the cylinder opening side of the groove bottom surface 88a.
- R chamfering is applied to the boundary position between the small diameter side of the large diameter wall surface 89a and the cylinder bottom side of the inner peripheral surface 89b.
- R chamfering is applied to the boundary position between the cylinder opening side of the inner peripheral surface 89b and the large-diameter side of the small-diameter wall surface 89c.
- R chamfering is applied to the boundary position between the small diameter side of the small diameter wall surface 89 c and the cylinder opening side of the circumferential groove 32 of the sliding inner diameter portion 29.
- the peripheral wall 89 is formed with a step portion 91 whose inner side in the radial direction is positioned closer to the cylinder opening side than the outer side in the radial direction at the intermediate portion in the radial direction.
- the step 91 has a part on the inner peripheral surface 89b side of the large-diameter wall surface 89a, an inner peripheral surface 89b, and a part on the inner peripheral surface 89b side of the small-diameter wall surface 89c.
- the peripheral wall 90 facing the peripheral wall 89 has a wall surface 90a and a tapered surface 90b.
- the wall surface 90a is formed of a flat surface on the groove bottom portion 88 side in the cylinder radial direction of the peripheral wall 90 and parallel to the orthogonal surface of the cylinder axis.
- the wall surface 90a has a constant inner diameter and a constant outer diameter, a constant width in the cylinder radial direction, and has an annular shape centering on the cylinder axis.
- the tapered surface 90b is located on the inner side in the cylinder radial direction with respect to the wall surface 90a of the peripheral wall 90, and extends from the inner end edge of the wall surface 90a in the cylinder radial direction to the cylinder bottom side so as to reduce in diameter toward the cylinder bottom side. Yes.
- the tapered surface 90 b has a constant inner diameter and a constant outer diameter, a constant width in the cylinder radial direction, and is disposed in an annular shape centering on the cylinder axis except for the communication groove 51.
- the maximum diameter of the tapered surface 90b is smaller than the diameter of the inner peripheral surface 89b of the peripheral wall 89, and the angle formed with the wall surface 90a is an obtuse angle.
- the taper surface 90b is formed on the opening side (diameter direction inner side) of the circumferential groove 32 in the circumferential wall 90 on the cylinder bottom side of the circumferential groove 32, and the wall surface on the groove bottom portion 88 side in the cylinder radial direction of the taper surface 90b.
- 90a is formed adjacent to each other.
- R chamfering is applied to the boundary position between the large diameter side of the wall surface 90a and the cylinder bottom side of the groove bottom surface 88a.
- R chamfering is applied to the boundary position between the smaller diameter side of the tapered surface 90 b and the cylinder bottom side of the circumferential groove 32 of the sliding inner diameter portion 29.
- the step 75 formed in the primary piston 18 has a cylindrical surface 75a, a tapered surface 75b, and a tapered surface 75c.
- the cylindrical surface 75a has a smaller diameter than the outermost cylindrical surface 74 having the largest diameter in the primary piston 18, and has a constant width in the axial direction.
- the tapered surface 75b extends so as to increase in diameter from the end of the cylinder surface 75a on the cylinder opening side toward the cylinder opening side, and is connected to a portion on the cylinder opening side of the stepped portion 75 of the outer diameter surface 74. ing.
- the tapered surface 75c extends so as to increase in diameter from the edge of the cylindrical surface 75a on the cylinder bottom side toward the cylinder bottom side, and is connected to a portion on the cylinder bottom side of the stepped portion 75 of the outer diameter surface 74. ing.
- the cylindrical surface 75a, the tapered surface 75b, and the tapered surface 75c are formed around the central axis of the primary piston 18 like the outer diameter surface 74.
- the port 76 that always communicates with the primary pressure chamber 85 is formed at a position that spans both the cylindrical surface 75a and the tapered surface 75b. In other words, the port 76 has an end on the cylinder bottom side located on the cylindrical surface 75a and an end on the cylinder opening side located on the tapered surface 75b.
- the piston seal 45 disposed in the circumferential groove 32 has a base 101, an inner peripheral lip 102, an outer peripheral lip 103, and an intermediate protrusion 104.
- the base 101 is disposed on the cylinder opening side (right side in FIG. 2) of the piston seal 45, and has an annular plate shape parallel to the axis orthogonal plane of the piston seal 45.
- the inner peripheral lip portion 102 has an annular cylindrical shape protruding from the inner peripheral end of the base portion 101 toward the cylinder bottom side (left side in FIG. 2) along the cylinder axial direction.
- the outer peripheral lip 103 has an annular cylindrical shape that protrudes from the outer peripheral end of the base 101 toward the cylinder bottom along the cylinder axial direction.
- the intermediate protrusion 104 has an annular cylindrical shape that protrudes from the base 101 toward the bottom of the cylinder along the cylinder axial direction between the outer peripheral lip 103 and the inner peripheral lip 102 and beyond the outer peripheral lip 103. There is no.
- the inner peripheral lip 102 of the piston seal 45 is in sliding contact with the outer peripheral surface 18a including the cylindrical surface 75a, the tapered surface 75b, the tapered surface 75c and the outer diameter surface 74 of the primary piston 18 moving in the cylinder axial direction. Further, the outer peripheral lip 103 of the piston seal 45 abuts on the groove bottom 88 of the peripheral groove 32 of the cylinder body 15.
- the piston seal 45 in a natural state before being assembled in the master cylinder 11 will be described with reference to FIGS. 3A to 4.
- the base portion 101, the inner peripheral lip portion 102, the outer peripheral lip portion 103, and the intermediate projecting portion 104 have the same central axis, and this central axis is the central axis of the piston seal 45.
- the base 101 side in the axial direction is set as the back side
- the protruding sides of the inner peripheral lip portion 102, the outer peripheral lip portion 103, and the intermediate protruding portion 104 in the axial direction are set as the front side.
- the piston seal 45 includes a plurality of front side groove portions (communication portions) 106 at equal intervals in the circumferential direction on the front side, that is, the front end side of the intermediate protrusion 104 (specifically, in the present embodiment, 12 F) is formed.
- the piston seal 45 has a plurality of back side groove portions 105 formed at equal intervals in the circumferential direction on the back side of the base portion 101 (specifically, 12 locations in the present embodiment). Note that it is not always necessary to form a plurality of back side grooves 105, and it is sufficient to form one or more back side grooves 105. Further, when forming a plurality of back side grooves 105, it is not always necessary to form them at equal intervals in the circumferential direction.
- the base 101 has a small-diameter back surface 101a, an outer peripheral surface 101b, a large-diameter back surface 101c, and a curved surface 101d.
- the small-diameter back surface 101a, the outer peripheral surface 101b, the large-diameter back surface 101c, and the curved surface 101d are divided by the backside groove 105 and are formed intermittently at equal intervals in the circumferential direction.
- the small-diameter back surface 101 a is located at the end on the most back side in the axial direction in the piston seal 45.
- the small-diameter back surface 101a is formed so as to intermittently configure a part of this plane on the same plane parallel to the axis orthogonal plane of the piston seal 45.
- the small-diameter back surface 101 a has a constant inner diameter, a constant outer diameter, and a constant width in the radial direction, and is disposed on the same circle centered on the central axis of the piston seal 45.
- the outer peripheral surface 101b is on the outer side in the radial direction of the small-diameter back surface 101a and extends from the small-diameter back surface 101a to the front side along the axial direction.
- the outer peripheral surface 101b has a constant diameter and a constant length in the axial direction, and is formed so as to intermittently configure a part of this cylindrical surface on the same cylindrical surface with the central axis of the piston seal 45 as the center. Yes.
- the large-diameter back surface 101c extends from the front side in the axial direction of the outer peripheral surface 101b to the outside in the radial direction.
- the large-diameter back surface 101c is formed so as to intermittently configure a part of this plane on the same plane parallel to the axis orthogonal plane of the piston seal 45.
- the large-diameter back surface 101 c has a constant inner diameter, a constant outer diameter, and a constant width in the radial direction, and is disposed on the same circle centered on the central axis of the piston seal 45.
- the curved surface 101d is inclined so that the outer side in the radial direction is located on the front side.
- the curved surface 101 d has an arc shape in which the cross-sectional shape including the central axis of the piston seal 45 has a center on the inner side of the base 101.
- the curved surface 101d has a constant inner diameter and a constant outer diameter, and a constant width in the cylinder radial direction.
- the curved surface 101d is formed on the same cylindrical surface centered on the central axis of the piston seal 45 so as to intermittently configure a part of this cylindrical surface.
- R-chamfering is applied to the boundary position between the small-diameter back surface 101a and the outer peripheral surface 101b.
- R chamfering is applied to the boundary position between the outer peripheral surface 101b and the large-diameter back surface 101c.
- the base 101 is formed with a stepped portion 107 on the outer peripheral side from the center of the radial intermediate portion on the back side thereof, the radial inner side being located on the rear side of the radial outer side.
- the stepped portion 107 has a larger axial length on the inner peripheral side than on the outer peripheral side.
- the step 107 has a part on the outer peripheral surface 101b side of the small-diameter back surface 101a, an outer peripheral surface 101b, and a part on the outer peripheral surface 101b side of the large-diameter back surface 101c.
- Each of the plurality of backside grooves 105 has a pair of opposing surfaces 105a shown in FIG. 3B, a small-diameter bottom surface 105b, an intermediate step surface 105c, and a large-diameter bottom surface 105d shown in FIG.
- the pair of facing surfaces 105a shown in FIG. 3B are along the radial line of the piston seal 45 and along the axial direction, and are parallel to each other.
- the small diameter bottom surface 105 b shown in FIG. 4 is located on the back side in the back side groove portion 105.
- the plurality of small-diameter bottom surfaces 105 b have a constant inner diameter, a constant outer diameter, and a constant width in the radial direction, and are arranged on the same circle centered on the central axis of the piston seal 45.
- the intermediate step surface 105c shown in FIG. 4 is on the outer side in the radial direction of the small-diameter bottom surface 105b constituting the same back-side groove 105, and extends from the small-diameter bottom surface 105b to the front side along the axial direction.
- a plurality of intermediate step surfaces 105c of the plurality of back side grooves 105 shown in FIG. 3B have a constant diameter and a constant length in the axial direction, and the cylindrical surface of the cylindrical surface is centered on the central axis of the piston seal 45. A part is formed intermittently.
- the large-diameter bottom surface 105d shown in FIG. 4 extends outward in the radial direction from the front side in the axial direction of the intermediate step surface 105c constituting the same back-side groove 105.
- the plurality of large-diameter bottom surfaces 105 d of the plurality of back-side grooves 105 shown in FIG. 3B are formed so as to intermittently configure a part of this plane on the same plane parallel to the axis orthogonal to the piston seal 45.
- R chamfering is applied to the boundary position between the small-diameter bottom surface 105b and the intermediate step surface 105c.
- R chamfering is applied to the boundary position between the intermediate step surface 105c and the large-diameter bottom surface 105d.
- the inner peripheral lip portion 102 has a tapered cylindrical shape with a small diameter as a whole as it moves away from the base portion 101 in the axial direction.
- a reduced diameter inner peripheral surface 101e, an enlarged inner peripheral surface 101f, a reduced inner peripheral surface 102a, and an enlarged inner peripheral surface 102b are sequentially arranged from the back side in the axial direction. Is formed.
- the reduced diameter inner peripheral surface 101 e is formed on the base 101.
- the reduced diameter inner peripheral surface 101e is formed in a taper shape with the central axis of the piston seal 45 as the center so that the diameter decreases toward the front side in the axial direction (that is, the diameter decreases).
- the enlarged inner peripheral surface 101 f is formed on the base 101.
- the enlarged inner peripheral surface 101f has a taper centered on the central axis of the piston seal 45 so that the diameter increases from the front side in the axial direction of the reduced inner peripheral surface 101e toward the front side in the axial direction (that is, the diameter increases). It is formed in a shape.
- the reduced diameter inner peripheral surface 102 a is formed across the base portion 101 and the inner peripheral lip portion 102.
- the diameter-reduced inner peripheral surface 102a is tapered with the central axis of the piston seal 45 as the center so that the diameter decreases toward the front side from the front side in the axial direction of the enlarged inner peripheral surface 101f (that is, the diameter decreases). Is extended.
- the expanded inner peripheral surface 102 b is formed on the inner peripheral lip portion 102.
- the diameter-enlarged inner peripheral surface 102b is a taper centered on the central axis of the piston seal 45 so that the diameter increases from the front side in the axial direction of the reduced-diameter inner peripheral surface 102a toward the front side (that is, the diameter increases). It extends in a shape.
- a reduced diameter outer peripheral surface 102 c is formed on the outer peripheral side of the inner peripheral lip portion 102.
- the reduced diameter outer peripheral surface 102c extends in a tapered cylindrical shape centering on the central axis of the piston seal 45 so that the diameter is smaller (that is, the diameter is reduced) toward the front side in the axial direction.
- the most front end surface 102 d of the inner peripheral lip portion 102 is substantially parallel to the axis orthogonal surface of the piston seal 45.
- the distal end surface 102 d has a constant inner diameter and a constant outer diameter, a constant width in the radial direction of the piston seal 45, and an annular shape centering on the central axis of the piston seal 45.
- R chamfering is applied to the boundary position between the reduced diameter inner peripheral surface 101e and the enlarged diameter inner peripheral surface 101f.
- R chamfering is applied to the boundary position between the enlarged inner peripheral surface 101f and the reduced inner peripheral surface 102a.
- R chamfering is applied to the boundary position between the reduced diameter inner peripheral surface 102a and the enlarged diameter inner peripheral surface 102b.
- R chamfering is applied to the boundary position between the reduced diameter outer peripheral surface 102c and the tip end surface 102d.
- the boundary portion between the reduced inner peripheral surface 102a and the expanded inner peripheral surface 102b is the smallest diameter portion 108 having the smallest inner diameter.
- the minimum diameter portion 108 has an annular shape centering on the central axis of the piston seal 45.
- the smallest diameter portion 108 is a portion having the smallest inner diameter in the piston seal 45 as well.
- the boundary portion between the enlarged inner peripheral surface 101f and the reduced inner peripheral surface 102a of the base 101 is a concave portion 109 that is recessed radially outward.
- the concave portion 109 also has an annular shape centering on the central axis of the piston seal 45.
- the outer peripheral lip 103 extends in a tapered cylindrical shape centering on the central axis of the piston seal 45 so that the front side in the axial direction has a larger diameter as a whole.
- an enlarged inner peripheral surface 103a and a cylindrical inner peripheral surface 103b are formed in order from the back side in the axial direction.
- the expanded inner peripheral surface 103a extends in a tapered shape centered on the central axis of the piston seal 45 so that the diameter increases toward the front side in the axial direction (that is, the diameter increases).
- the cylindrical inner peripheral surface 103b extends from the front side of the expanded inner peripheral surface 103a in a cylindrical surface shape with the central axis of the piston seal 45 as the center.
- the outer peripheral surface 101b, the large-diameter back surface 101c, and the curved surface 101d are formed in this order from the back side in the axial direction on the outer peripheral side of the outer peripheral lip 103 and the base 101. Further, the enlarged outer peripheral surface 103c and the cylindrical outer periphery are formed. A surface 103d is formed. The enlarged diameter outer peripheral surface 103 c is formed across the base portion 101 and the outer peripheral lip portion 103. The diameter-enlarged outer peripheral surface 103c extends from the front side of the curved surface 101d of the base 101 in a taper shape centered on the central axis of the piston seal 45 so that the diameter increases toward the front side in the axial direction (that is, the diameter increases). I'm out.
- the cylindrical outer peripheral surface 103d extends from the front side of the enlarged diameter outer peripheral surface 103c in a cylindrical surface shape with the central axis of the piston seal 45 as the center.
- the front end surface 103 e on the front side of the outer peripheral lip portion 103 is parallel to the axis orthogonal surface of the piston seal 45.
- the distal end surface 103 e has a constant inner diameter and a constant outer diameter, a constant width in the radial direction of the piston seal 45, and has an annular shape centering on the central axis of the piston seal 45. R chamfering is applied to the boundary position between the expanded inner peripheral surface 103a and the cylindrical inner peripheral surface 103b.
- R chamfering is applied to the boundary position between the cylindrical inner peripheral surface 103b and the tip surface 103e.
- R chamfering is applied to the boundary position between the expanded outer peripheral surface 103c and the cylindrical outer peripheral surface 103d.
- R chamfering is applied to the boundary position between the cylindrical outer peripheral surface 103d and the tip end surface 103e.
- An enlarged inner peripheral surface 104 a is formed on the inner peripheral side of the intermediate protrusion 104.
- the enlarged inner peripheral surface 104a extends in a taper shape centered on the central axis of the piston seal 45 so that the diameter increases slightly toward the front side in the axial direction.
- a reduced-diameter outer peripheral surface 104 b is formed on the outer peripheral side of the intermediate protrusion 104.
- the reduced diameter outer peripheral surface 104b extends in a taper shape with the central axis of the piston seal 45 as a center so that the diameter is slightly smaller toward the front side in the axial direction.
- the front end surface 104c on the front side of the intermediate protrusion 104 is parallel to the axis-perpendicular surface of the piston seal 45, and has a constant inner diameter and a constant outer diameter and a constant width in the radial direction of the piston seal 45.
- the front end surface 104c has a plurality of front side grooves 106 formed therein.
- the plurality of front side groove portions 106 are formed so as to intermittently configure a part of this plane on the same plane parallel to the axis orthogonal plane of the piston seal 45.
- the distal end surface 104 c is disposed at a position on the same circle with the central axis of the piston seal 45 as the center. As shown in FIG.
- R chamfering is applied to the boundary position between the enlarged inner peripheral surface 104a and the distal end surface 104c.
- R chamfering is applied to the boundary position between the reduced diameter outer peripheral surface 104b and the tip end surface 104c.
- R chamfering is applied to the boundary position between the enlarged inner peripheral surface 104a and the reduced outer peripheral surface 102c of the inner peripheral lip 102.
- R chamfering is applied to the boundary position between the reduced diameter outer peripheral surface 104 b and the enlarged inner peripheral surface 103 a of the outer peripheral lip 103.
- the plurality of front side groove portions 106 are formed in the same number as the plurality of back side groove portions 105, and as shown in FIGS. 3A and 3B, the position in the circumferential direction of the piston seal 45 is shifted from the back side groove portion 105 by a half pitch. Yes.
- Each of the plurality of front side groove portions 106 has a pair of opposing surfaces 106a and a bottom surface 106b.
- the pair of opposed surfaces 106a are along the radial line of the piston seal 45 and along the axial direction, and are parallel to each other.
- the bottom surface 106 b is located at the end on the most back side in the front groove portion 106.
- a plurality of bottom surfaces 106 b of the plurality of front side groove portions 106 shown in FIG. 3A are disposed so as to be partially configured on the same plane parallel to the axis perpendicular to the piston seal 45.
- a plurality of front side grooves 106 are not necessarily formed, and one or more may be formed, and it is not always necessary to form the same number as the back side grooves 105.
- the piston seal 45 in the basic state (non-braking state before the brake pedal is operated) will be described with reference to FIGS. 2, 5A, and 5B.
- the basic state of the piston seal 45 is that it is incorporated in the circumferential groove 32 of the cylinder body 15 and properly contacts the axially intermediate position of the cylindrical surface 75a of the step 75 of the primary piston 18, and the cylinder opening side of the circumferential groove 32 It is in contact with the peripheral wall 89 (on the right side in FIG. 2) and away from the peripheral wall 90 on the cylinder bottom side (the left side in FIG. 2) of the peripheral groove 32.
- the base 101 When the piston seal 45 is in this basic state, the base 101 is located closest to the cylinder opening, and the step 107 formed in the base 101 is fitted into the step 91 formed in the circumferential groove 32. is doing.
- the large-diameter back surface 101c of the base 101 abuts on the large-diameter wall surface 89a of the peripheral wall 89, so that the peripheral groove 32 is directed toward the opening 16 in the cylinder axial direction. Further movement is restricted.
- the inside of the back-side groove 105 is a communication path 111 that always communicates between the primary supply path 48 and the groove bottom 88 side of the circumferential groove 32 between the step 107 and the step 91.
- a plurality of such communication paths 111 are formed at equal intervals along the circumferential direction of the cylinder.
- the tip end surface 104c of the intermediate projecting portion 104 abuts against the wall surface 90a of the circumferential wall 90 on the cylinder bottom side of the circumferential groove 32, so that the piston seal 45 is basically against the circumferential groove 32. Further movement to the bottom side of the cylinder is restricted. That is, the piston seal 45 can basically move in the cylinder groove direction within the circumferential groove 32 in a range from a state where the piston seal 45 is in contact with the large-diameter wall surface 89a of the peripheral wall 89 to a state where it is in contact with the wall surface 90a of the peripheral wall 90. ing.
- the outer peripheral surface 101b of the stepped portion 107 of the base 101 and the peripheral groove 32 are larger than the movable amount in the cylinder axial direction within the peripheral groove 32 of the piston seal 45 in which the deformation amount is considered in the amount of movement in the cylinder axial direction.
- the maximum value of the overlap amount in the cylinder axial direction with the inner peripheral surface 89b of the step portion 91 is configured to be larger.
- the cylinder axial distance between the small-diameter back surface 101a and the large-diameter back surface 101c, which is the step amount of the step portion 107, and the cylinder axial distance between the large-diameter wall surface 89a and the small-diameter wall surface 89c, which are step amounts of the step portion 91 The shorter one (in this case, the distance between the small-diameter back surface 101a and the large-diameter back surface 101c in the cylinder axial direction) is set to be longer than the movable amount in the cylinder axial direction within the circumferential groove 32 of the piston seal 45.
- the inner peripheral surface 89b of the step portion 91 of the circumferential groove 32 always overlaps the outer peripheral surface 101b of the stepped portion 107 of the piston seal 45 in the cylinder axial direction, and always abuts. That is, even if the piston seal 45 is elastically deformed, the fitting state of the stepped portion 107 of the base portion 101 to the stepped portion 91 of the circumferential groove 32 is always maintained.
- the piston seal 45 When the piston seal 45 is in the basic state, the inner peripheral lip 102 on the innermost peripheral side of the piston seal 45 contacts the cylindrical surface 75a of the stepped portion 75 of the outer peripheral surface 18a of the primary piston 18 at the inner peripheral portion. .
- the piston seal 45 includes the boundary side between the reduced diameter inner peripheral surface 101e and the enlarged inner peripheral surface 101f of the base 101 shown in FIG. 4 and the reduced inner peripheral surface 102a and the enlarged inner periphery of the inner peripheral lip portion 102.
- the boundary side of the surface 102b is in contact with the cylindrical surface 75a shown in FIG. 2, and is deformed into a cylindrical surface having a larger diameter than before the deformation following the cylindrical surface 75a.
- the base 101 and the inner peripheral lip 102 come into contact with the cylindrical surface 75a with a tightening margin.
- the minimum diameter portion 108 shown in FIG. 4 having the minimum inner diameter is the maximum tightening margin portion where the tightening margin with respect to the cylindrical surface 75a is maximum.
- the outer peripheral lip 103 on the outermost peripheral side is located on the groove bottom 88 of the peripheral groove 32 at the boundary position between the enlarged outer peripheral surface 103 c and the cylindrical outer peripheral surface 103 d. They are in contact and bent inward in the radial direction.
- the intermediate projecting portion 104 is in a state similar to the natural state, and its tip surface 104c is parallel to the plane perpendicular to the cylinder axis.
- the intermediate projecting portion 104 has a length equivalent to the inner peripheral lip portion 102 elastically deformed by the primary piston 18 and extends to the cylinder bottom side (left side in FIG. 2) from the outer peripheral lip portion 103.
- the intermediate projecting portion 104 when in the basic state, has its entire front end surface 104c aligned with the wall surface 90a of the peripheral wall 90 of the peripheral groove 32 in the cylinder radial direction, as described above.
- middle protrusion part 104 is arrange
- the intermediate protrusion 104 is separated from the peripheral wall 90 including the wall surface 90a in the cylinder axial direction.
- the inner peripheral lip portion 102 When in the basic state, the inner peripheral lip portion 102 has its tip end surface 102d aligned with the tapered surface 90b of the peripheral wall 90 of the peripheral groove 32 and the tapered surface 75c of the stepped portion 75 of the primary piston 18 in the cylinder radial direction.
- the taper surface 90b and the taper surface 75c are arranged to face each other.
- the inner peripheral lip 102 is separated from the peripheral wall 90 including the tapered surface 90b in the cylinder axial direction, and is also separated from the tapered surface 75c in the cylinder axial direction.
- the front end surface 102d of the inner peripheral lip portion 102 does not overlap the wall surface 90a of the peripheral wall 90 with the position in the cylinder radial direction.
- the primary piston 18 When there is no input from the brake pedal (not shown) and the primary piston 18 is in a basic position (non-braking position) for opening the port 76 into the opening groove 47 as shown in FIG.
- the inner peripheral portion of the lip portion 102 and the base portion 101 is at the position of the cylindrical surface 75 a of the step portion 75 of the primary piston 18, and the inner peripheral portion of the base portion 101 overlaps a part of the port 76 with the position in the cylinder axial direction. .
- the back surface 101c is separated from the large-diameter wall surface 89a in the cylinder axis direction. Then, the piston seal 45 stops with respect to the cylinder body 15 when the tip end surface 104 c of the intermediate protrusion 104 abuts against the wall surface 90 a of the peripheral wall 90.
- the inside of the front-side groove 106 on the distal end side of the intermediate protrusion 104 constitutes a communication passage 113 that communicates the primary pressure chamber 85 and the groove bottom 88 side of the circumferential groove 32.
- a plurality of such communication paths 113 are formed at regular intervals along the circumferential direction of the cylinder. These communication passages 113 always communicate the primary pressure chamber 85 and the groove bottom 88 side of the circumferential groove 32.
- the outer peripheral surface 101 b of the stepped portion 107 of the piston seal 45 is maintained in contact with the inner peripheral surface 89 b of the stepped portion 91 of the peripheral wall 89.
- the piston seal 45 rides on the outer diameter surface 74 with the base 101 getting over the tapered surface 75b.
- the inner peripheral lip portion 102 rides on the tapered surface 75b.
- the inner peripheral lip portion 102 rides on the outer diameter surface 74.
- the piston seal 45 blocks communication between the primary pressure chamber 85 and the primary supply path 48 via the port 76. Therefore, if the primary piston 18 moves to the cylinder bottom side, the brake fluid in the primary pressure chamber 85 increases and is supplied from the primary discharge path 27 shown in FIG. 1 to the brake cylinder on the wheel side.
- the piston seal 45 moves toward the peripheral wall 89 in the peripheral groove 32 when the hydraulic pressure in the primary pressure chamber 85 rises. As a result, as shown in FIG. 5B, the intermediate projecting portion 104 is separated from the peripheral wall 90 and the base portion 101 contacts the large-diameter wall surface 89 a of the peripheral wall 89 on the large-diameter back surface 101 c.
- the primary piston 18 moves toward the cylinder bottom as described above and starts to return a brake pedal (not shown) to release braking, the primary piston 18 is shown in FIG. Try to return to the basic position.
- the movement of the primary piston 18 increases the volume of the primary pressure chamber 85.
- the hydraulic pressure in the primary replenishment path 48 and the hydraulic pressure in the primary pressure chamber 85 which are atmospheric pressures, are obtained.
- the hydraulic pressure in the primary pressure chamber 85 becomes negative, and the hydraulic pressure in the primary pressure chamber 85 becomes lower than the hydraulic pressure in the primary supply path 48, which is atmospheric pressure.
- the negative pressure in the primary pressure chamber 85 causes the piston seal 45 to move toward the peripheral wall 90 in the peripheral groove 32 as shown in FIG. 6A.
- the small-diameter back surface 101a of the base 101 increases the distance in the cylinder axial direction from the small-diameter wall surface 89c, and the large-diameter back surface 101c is separated from the large-diameter wall surface 89a in the cylinder axial direction.
- the outer peripheral lip 103 of the piston seal 45 is deformed so as to be separated from the groove bottom 88.
- the brake fluid flows from the primary supply path 48 to the groove bottom 88 side of the circumferential groove 32 via the communication path 111 in the back-side groove 105, and the flow path 112 in the gap between the outer peripheral lip 103 and the groove bottom 88.
- the air flows into the primary pressure chamber 85 through the communication groove 113 formed between the front groove 106 formed in the intermediate protrusion 104 and the peripheral wall 90 of the peripheral groove 32.
- the brake fluid is supplied from the primary supply path 48 to the primary pressure chamber 85, and the hydraulic pressure in the primary pressure chamber 85 can be returned from the negative pressure state to the atmospheric pressure.
- the master cylinder described in Patent Document 1 described above is provided with a cup seal that functions like a valve to assist the communication and release between the reservoir tank and the pressure chamber, and this cup seal is moved by the pressure from the pressure chamber.
- a spacer ring is provided to support it. And when this spacer ring moves under its own weight, there is a part where the gap with the piston becomes large, and the cup seal may bite into this part, so to prevent this, the spacer ring can be adhered to the back of the piston seal. Concave and convex are fitted. In this structure, the number of parts has increased.
- the secondary supply passage 38 and the primary supply passage are evacuated from the secondary discharge passage 26 and the primary discharge passage 27 side.
- Forced pumping is performed to pump the brake fluid pressurized from the path 48 side.
- the hydraulic pressure in the primary pressure chamber 85 is negative and the hydraulic pressure in the primary supply path 48 is positive higher than atmospheric pressure. Bigger than.
- the piston seal 45 moves in the circumferential groove 32 more rapidly than when the brake is released, and receives a larger force than when the brake is released.
- the outer diameter side of the base portion is greatly deformed so as to be positioned closer to the bottom side of the cylinder body than the inner diameter side due to a rapid flow of brake fluid, and accordingly, the outer peripheral lip portion is also the base portion.
- the opposite side may be deformed so as to be in close contact with the intermediate protrusion in the inner circumferential direction.
- the front side groove portion of the intermediate projecting portion may be blocked or may enter the gap between the piston and the cylinder body. Then, since it becomes difficult for the brake fluid to flow, it takes time to fill the secondary pressure chamber 68 and the primary pressure chamber 85 of the master cylinder 11 with the brake fluid, which may reduce the manufacturing efficiency and maintenance efficiency of the vehicle. .
- the stepped portion 107 having a larger axial length on the inner peripheral side is formed on the outer peripheral side of the base 101 of the piston seal 45, and the circumferential groove On the peripheral wall 89 on the cylinder opening side of 32, a step portion 91 is formed in which the outer peripheral surface 101b of the step portion 107 always abuts in the cylinder radial direction.
- the pressure difference between the primary pressure chamber 85 and the primary replenishment passage 48 becomes large at the time of forced pumping or the like, and the outer diameter side of the base 101 is the inner diameter due to the flow of the brake fluid at that time.
- the brake fluid from the primary replenishment path 48 is connected to the communication path 111 in the back side groove 105, the flow path 112 between the outer peripheral lip 103 and the groove bottom 88, and the communication path 113 in the front side groove 106.
- the primary pressure chamber 85 can be satisfactorily flown through, so that the manufacturing efficiency and maintenance efficiency of the vehicle can be improved.
- the step portion 107 comes into contact with the step portion 91 of the peripheral wall 89 in the radial direction, and deformation in the diameter increasing direction is suppressed.
- the port 76 can be reliably closed by being pressed against the tapered surface 75b. Therefore, the invalid stroke can be further shortened.
- the tightening allowance for the primary piston 18 of the piston seal 45 is set smaller than in the first embodiment. That is, as described in the first embodiment, the pressure difference between the primary pressure chamber 85 and the primary replenishment path 48 is increased by the step 107 of the piston seal 45 constantly contacting the step 91 of the circumferential groove 32. However, the posture of the piston seal 45 can be stabilized. From this, the fastening allowance with respect to the primary piston 18 of the piston seal 45 can be set small. For this reason, in 2nd Embodiment, the interference with respect to the primary piston 18 of the piston seal 45 is set smaller than 1st Embodiment.
- the diameter-reduced inner peripheral surface 101e, the diameter-enlarged inner peripheral surface 101f, the diameter-reduced inner peripheral surface 102a, and the diameter-expanded inner peripheral surface 102b of the piston seal 45 in the natural state are made larger in diameter than the first embodiment. .
- the inner peripheral lip portion 102 by setting the tightening margin of the piston seal 45 with respect to the primary piston 18 small, according to the pressure state of the primary pressure chamber 85 and the primary replenishment passage 48 such as during forced pumping shown in FIG. 7B. (Specifically, when these pressure differences become larger than a predetermined value), in addition to the deformation of the outer peripheral lip portion 103 of the first embodiment, the inner peripheral lip portion 102 also bends in a direction approaching the intermediate projecting portion 104. A flow path 114 is formed between the primary piston 18 and the primary pressure chamber 85 and the primary supply path 48 to communicate with each other.
- the brake fluid from the primary replenishment path 48 is extracted from the communication path 111 in the backside groove 105, the flow path 112 between the outer peripheral lip 103 and the groove bottom 88, and the communication path 113 in the front side groove 106.
- the flow from the flow path 114 between the inner peripheral lip 102 and the primary piston 18 can also flow into the primary pressure chamber 85.
- the brake fluid can be filled in the primary pressure chamber 85 with a larger flow rate.
- the brake fluid can also flow from the flow path 114 between the inner peripheral lip portion 102 and the primary piston 18, the flow rate of the flow path 112 between the outer peripheral lip portion 103 and the groove bottom portion 88 can be reduced. It is possible to suppress excessive deformation of the outer peripheral lip 103.
- the tightening allowance of the piston seal 45 can be reduced, the sliding resistance that the primary piston 18 receives from the piston seal 45 can be reduced. Furthermore, the rigidity of the inner peripheral lip 102 of the piston seal 45 can also be reduced. By doing so, the sliding resistance received from the piston seal 45 of the primary piston 18 can be further reduced.
- the intermediate protrusion 104 is formed on the piston seal 45.
- the present invention is not limited to this, and the inner lip is formed from the base 101 without forming the intermediate protrusion 104. Only the portion 102 and the outer peripheral lip portion 103 may be protruded.
- the circumferential wall 90 on the cylinder bottom side of the circumferential groove 32 is partially different from that of the second embodiment.
- the peripheral wall 90 of the third embodiment has a large-diameter wall surface 90c, an inner peripheral surface 90d, a small-diameter wall surface 90e, and a tapered surface 90b similar to the first embodiment.
- the large-diameter wall surface 90c is a flat surface on the radial wall bottom 88 side of the peripheral wall 90 and parallel to the plane perpendicular to the cylinder axis.
- the large-diameter wall surface 90c has a constant inner diameter and a constant outer diameter, a constant width in the cylinder radial direction, and has an annular shape centering on the cylinder axis.
- the inner peripheral surface 90d is on the inner side in the cylinder radial direction than the large-diameter wall surface 90c in the peripheral wall 90 and extends to the cylinder bottom side (left side in FIGS. 8A and 8B) from the large-diameter wall surface 90c along the cylinder axial direction. ing.
- the inner peripheral surface 90d is a cylindrical surface centered on the cylinder axis, and the length in the cylinder axis direction is constant.
- the small-diameter wall surface 90e is a flat surface that is on the inner side in the cylinder radial direction than the inner peripheral surface 90d of the peripheral wall 90 and parallel to the orthogonal surface of the cylinder axis.
- the small-diameter wall surface 90e has a constant inner diameter, a constant outer diameter and a constant width in the cylinder radial direction except for the communication groove 51, and has an annular shape centering on the cylinder axis.
- the peripheral wall 90 of the third embodiment is formed with a step portion (another step portion) 121 whose inner side in the radial direction is positioned closer to the cylinder bottom than the outer side in the radial direction at the intermediate portion in the radial direction.
- the step portion 121 has a part on the inner peripheral surface 90d side of the large-diameter wall surface 90c, an inner peripheral surface 90d, and a part on the inner peripheral surface 90d side of the small-diameter wall surface 90e.
- the intermediate protrusion 104 of the piston seal 45 of the third embodiment has an axial length longer than that of the second embodiment, and abuts the inner peripheral surface 90d of the stepped portion 121 at the reduced diameter outer peripheral surface 104b. It has become. That is, when in the basic state shown in FIG.
- the piston seal 45 has the large-diameter back surface 101c of the stepped portion 107 abuts the large-diameter wall surface 89a of the stepped portion 91 in the cylinder axial direction and the outer peripheral surface 101b of the stepped portion 107 is
- the step 91 is in contact with the inner peripheral surface 89 b of the stepped portion 91
- the tip surface 104 c of the intermediate protruding portion 104 is in contact with the small diameter wall surface 90 e of the stepped portion 121
- the reduced diameter outer peripheral surface 104 b of the intermediate protruding portion 104 is the inner peripheral surface of the stepped portion 121. Abut against 90d.
- the piston seal 45 As a result, in the piston seal 45, the step 107 formed in the base 101 is fitted into the step 91 formed in the circumferential groove 32, and the other protruding portion in which the intermediate protrusion 104 is formed in the circumferential groove 32. 121 is fitted. That is, the piston seal 45 of the third embodiment is in contact with the peripheral wall 89 and the peripheral wall 90 on both sides in the cylinder axial direction, and basically does not move in the cylinder axial direction.
- the bottom surface 106b of the front side groove 106 formed in the intermediate protrusion 104 extends from the peripheral wall 90 in the cylinder axial direction. It is separated. That is, the communication passage 113 in the front side groove portion 106 of the intermediate protrusion 104 always communicates the primary pressure chamber 85 and the groove bottom portion 88 side of the circumferential groove 32 even if the step portion 121 is present.
- the piston seal 45 of the third embodiment has a notch on the inner peripheral side of the base 101 that has a larger axial length on the outer peripheral side than on the inner peripheral side in order to reduce the rigidity of the inner peripheral lip portion 102.
- a portion 125 is formed.
- the notch 125 is located on the inner side in the radial direction of the small-diameter back surface 101a of the base 101 and extends from the small-diameter back surface 101a to the front side, and extends radially inward from the front side of the inner peripheral surface 101g.
- a curved surface 101h is formed on the inner side in the radial direction of the small-diameter back surface 101a of the base 101 and extends from the small-diameter back surface 101a to the front side, and extends radially inward from the front side of the inner peripheral surface 101g.
- the inner peripheral surface 101g has a constant diameter and a constant length in the axial direction, and is formed so as to intermittently constitute a part of this cylindrical surface on the same cylindrical surface with the central axis of the piston seal 45 as the center. ing.
- the curved surface 101h is inclined so that the radially inner side is located on the front side.
- the curved surface 101 h has an arc shape in which the cross-sectional shape including the central axis of the piston seal 45 has a center on the inner side of the base 101.
- the curved surface 101h has a constant inner diameter and a constant outer diameter and a constant width in the cylinder radial direction, and a part of this cylindrical surface is intermittently formed on the same cylindrical surface centering on the central axis of the piston seal 45.
- the back side groove part 105 has the one bottom face 105e along an axial orthogonal direction, and has penetrated the base 101 to radial direction.
- the reduced diameter outer peripheral surface 104b of the intermediate projecting portion 104 contacts the stepped portion 121 of the peripheral wall 90 on the cylinder bottom side of the peripheral groove 32, so that the posture of the piston seal 45 can be further stabilized. it can.
- the primary pressure chamber 85 and the primary replenishment passage 48 can be obtained at the time of forced pumping shown in FIG.
- the inner peripheral lip portion 102 in addition to the outer peripheral lip portion 103 bends in a direction approaching the intermediate projecting portion 104, thereby forming a flow path 114 between the primary piston 18 and the primary pressure chamber 85.
- the primary supply path 48 are communicated with each other.
- the piston seal 45 has the stepped portion 107 of the base portion 101 in contact with the stepped portion 91 of the circumferential groove 32 in the cylinder radial direction, and the end portion of the intermediate projecting portion 104 opposite to the base portion 101 is the circumferential groove 32. Therefore, the inner peripheral lip portion 102 can be prevented from being excessively bent radially outward. Therefore, the brake fluid from the primary replenishment path 48 is composed of the communication path 111 in the backside groove 105, the flow path 112 between the outer peripheral lip 103 and the groove bottom 88, and the communication path 113 in the front side groove 106. The flow and the flow path 114 between the inner peripheral lip portion 102 and the primary piston 18 can flow well into the primary pressure chamber 85.
- the primary-side seal structure portion SP has been described in detail as an example, but the secondary-side seal structure portion SS has the same structure, and thus the same effect can be achieved. Similar changes are possible.
- the above embodiment is provided with a bottomed cylindrical cylinder body having a brake fluid discharge path and a replenishment 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 path, and an inner circumference that is provided in a circumferential groove formed in the cylinder body and that is in sliding contact with the piston to seal between the supply path and the pressure chamber
- a piston cylinder is provided.
- the piston seal includes an annular base, an inner peripheral lip projecting from the inner peripheral side of the base and slidingly contacting the outer peripheral surface of the piston, and projecting from the outer peripheral side of the base to the circumferential groove of the cylinder body.
- a stepped portion having a larger axial length on the inner peripheral side is formed on the outer peripheral side of the base portion.
- a communication path is provided between the stepped portion and the stepped portion to communicate the supply path and the bottom side of the circumferential groove.
- the peripheral wall of the peripheral groove on the bottom side of the cylinder main body is formed with another step portion with which the outer peripheral surface of the intermediate projecting portion abuts, and on the distal end side of the intermediate projecting portion along the circumferential direction.
- a plurality of communication portions that are formed to be spaced apart from each other and communicate with the bottom side of the circumferential groove and the pressure chamber are provided. Since the outer peripheral surface of the intermediate projecting portion comes into contact with the other step portion of the circumferential groove, the posture of the piston seal can be further stabilized.
- the inner peripheral lip portion is bent in a direction approaching the intermediate projecting portion according to the pressure state of the pressure chamber and the replenishment path, and communicates the replenishment path and the pressure chamber.
- the brake fluid in the replenishment path can also flow into the pressure chamber from the flow path between the part and the piston.
- the posture of the piston seal can be stabilized.
Abstract
Description
本願は、2013年1月31日に、日本に出願された特願2013-016622号に基づき優先権を主張し、その内容をここに援用する。
本発明に係る第1実施形態を図1~図6B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には、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、鉛直方向上側に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。
次に、本発明に係る第2実施形態を主に図7A、図7B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。
次に、本発明に係る第3実施形態を主に図8A、図8Bに基づいて第2実施形態との相違部分を中心に説明する。なお、第2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。
12 リザーバ
13 底部
15 シリンダ本体
16 開口部
18 プライマリピストン(ピストン)
18a 外周面
19 セカンダリピストン(ピストン)
26 セカンダリ吐出路(吐出路)
27 プライマリ吐出路(吐出路)
30,32 周溝
35,45 ピストンシール
38 セカンダリ補給路(補給路)
48 プライマリ補給路(補給路)
68 セカンダリ圧力室(圧力室)
85 プライマリ圧力室(圧力室)
88 溝底部(周溝の底部)
89 周壁(シリンダ本体の開口部側の周壁)
90 周壁(シリンダ本体の底部側の周壁)
91 段部
101 基部
101b 外周面
102 内周リップ部
103 外周リップ部
104 中間突出部
106 表側溝部(連通部)
107 段差部
111 連通路
121 段部(他の段部)
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、
前記シリンダ本体に形成された周溝内に設けられ内周が前記ピストンに摺接して前記補給路と前記圧力室との間を密封するピストンシールとを備え、
該ピストンシールが、
前記ピストンの外周面に摺接する内周リップ部と前記シリンダ本体の前記周溝に当接する外周リップ部とが突出して設けられる円環状の基部を有し、
前記基部の外周側には、内周側の方が大きな軸方向長さを有する段差部が形成され、
前記周溝の前記シリンダ本体の開口部側の周壁には、前記段差部の外周面が常時当接する段部が形成されている
マスタシリンダ。 - 前記段差部と前記段部との間には、前記補給路と前記周溝の底部側とを連通する連通路が設けられている請求項1記載のマスタシリンダ。
- 前記ピストンシールは、前記基部の前記内周リップ部と前記外周リップ部との間から該外周リップ部よりも先まで突出する中間突出部を更に備えており、
前記周溝の前記シリンダ本体の底部側の周壁には、前記中間突出部の外周面が当接する他の段部が形成され、
前記中間突出部の先端側には、周方向に沿って離間して形成され、前記周溝の底部側と前記圧力室とを連通する複数の連通部が設けられている請求項1または2に記載のマスタシリンダ。 - 前記内周リップ部は、前記圧力室と前記補給路との圧力状態に応じて前記中間突出部に近づく方向に撓んで、前記補給路と前記圧力室とを連通する請求項1乃至3のいずれかに記載のマスタシリンダ。
- 前記ピストンシールは、前記ピストンを移動させるためのブレーキペダルが操作される前の非制動状態である基本状態において、前記基部の内周面が前記ピストンの外周面から離間した状態となるように形成されている請求項1乃至4のいずれかに記載のマスタシリンダ。
- 前記基部の内周側には、前記段差部の軸方向長さが内周側よりも外周側の方が大きくなる切欠部が形成されている請求項1乃至5のいずれかに記載のマスタシリンダ。
Priority Applications (4)
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JP2014559713A JP5961710B2 (ja) | 2013-01-31 | 2014-01-29 | マスタシリンダ |
US14/763,883 US10183657B2 (en) | 2013-01-31 | 2014-01-29 | Master cylinder |
DE112014000626.2T DE112014000626T5 (de) | 2013-01-31 | 2014-01-29 | Mastezylinder |
CN201480005508.9A CN104936839B (zh) | 2013-01-31 | 2014-01-29 | 主缸 |
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JP2013-016622 | 2013-01-31 | ||
JP2013016622 | 2013-01-31 |
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WO2014119611A1 true WO2014119611A1 (ja) | 2014-08-07 |
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US (1) | US10183657B2 (ja) |
JP (1) | JP5961710B2 (ja) |
CN (1) | CN104936839B (ja) |
DE (1) | DE112014000626T5 (ja) |
WO (1) | WO2014119611A1 (ja) |
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JP2016101898A (ja) * | 2014-11-28 | 2016-06-02 | 日立オートモティブシステムズ株式会社 | マスタシリンダ |
JP2016101863A (ja) * | 2014-11-28 | 2016-06-02 | 日立オートモティブシステムズ株式会社 | マスタシリンダ |
JP2016210345A (ja) * | 2015-05-12 | 2016-12-15 | 日信工業株式会社 | バーハンドル車両用液圧マスタシリンダ装置 |
JP6442647B1 (ja) * | 2017-06-13 | 2018-12-19 | Nok株式会社 | 密封装置 |
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CN109281953B (zh) * | 2017-07-19 | 2021-12-10 | 舍弗勒技术股份两合公司 | 用于离合器主缸的单件式密封装置及离合器主缸 |
DE112018004880B4 (de) * | 2017-08-29 | 2021-10-07 | Hitachi Automotive Systems, Ltd. | Hauptzylinder |
JP7034276B2 (ja) * | 2018-05-29 | 2022-03-11 | 日立Astemo株式会社 | マスタシリンダ |
JP7385428B2 (ja) * | 2019-10-24 | 2023-11-22 | 株式会社Subaru | マスタシリンダ装置 |
CN112983921A (zh) * | 2021-01-05 | 2021-06-18 | 威海中颐液压科技股份有限公司 | 螺旋液压摆动马达 |
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Also Published As
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JP5961710B2 (ja) | 2016-08-02 |
US20150360660A1 (en) | 2015-12-17 |
JPWO2014119611A1 (ja) | 2017-01-26 |
DE112014000626T5 (de) | 2015-11-05 |
CN104936839A (zh) | 2015-09-23 |
CN104936839B (zh) | 2017-08-11 |
US10183657B2 (en) | 2019-01-22 |
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