Master Piston Traps Liquid On Advance Across A Feed Port In Cylinder Wall Patents (Class 60/588)
  • Patent number: 10988125
    Abstract: A fluid container having at least one internal chamber for receiving a fluid, and having at least one connector for hydraulically connecting the internal chamber to a downstream hydraulic apparatus, wherein the connector at the end thereof toward the internal chamber has a mouth portion. In order to propose an improved fluid container by way of which high volumetric flows can also pass through the connector at high throughflow rates with low losses and reduced resistance, it is proposed that an escape value of the connector is provided so as to be larger than 0.82, and the mouth portion in relation to a container wall region that directly surrounds the mouth portion is at least in portions designed so as to be raised in the direction of the internal chamber.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: April 27, 2021
    Inventors: Swen Ottmann, Manfred Rüffer
  • Patent number: 10589817
    Abstract: A control device for a bicycle, has a first body adapted to be attached to a bicycle handlebar, at least one control member of at least one bicycle component, and a second body, distinct from the first body, connected to the first body to increase a grip surface of the control device and/or to vary the relative position of the at least one control member with respect to the handlebar of the bicycle, so as to adapt the control device to the size of the cyclist's hand.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: March 17, 2020
    Assignee: CAMPAGNOLO S.R.L.
    Inventor: Giuseppe Dal Pra'
  • Patent number: 10501145
    Abstract: A master cylinder device 38 for a rear wheel brake of a motorcycle includes a master cylinder 35 and a reserve tank 36. The cylinder 35 discharges brake fluid when a piston thereof is pushed by depression of a brake pedal 40. The reserve tank is integrally formed with a cylinder body 35a of the master cylinder 35. A contour 60 of a rear wheel side of the master cylinder device 38 extending continuously from a bottom end ? of the master cylinder body 35a in a vertical direction to an upper end ? of the reserve tank 36 in the vertical direction is linearly formed to be oriented obliquely rearward and upward in a vehicle side view.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: December 10, 2019
    Assignee: SUZUKI MOTOR CORPORATION
    Inventors: Tatsuya Yuse, Kuninari Kurabayashi
  • Patent number: 10427752
    Abstract: A bicycle operating device comprises a base member, a hydraulic cylinder, a piston, and a fluid passageway. The base member is configured to be mounted to a bicycle. The hydraulic cylinder is provided on the base member and includes a cylinder bore. The piston is movably provided in the cylinder bore. The cylinder bore and the piston define a hydraulic chamber. The fluid passageway is connected to the hydraulic chamber. The fluid passageway is provided inside the base member. The fluid passageway has a length longer than a stroke of the piston.
    Type: Grant
    Filed: May 23, 2016
    Date of Patent: October 1, 2019
    Assignee: SHIMANO INC.
    Inventors: Keiji Matsueda, Kentaro Kosaka, Masahiro Nakakura
  • Patent number: 10378598
    Abstract: Flexible sheathing for the protection of piston-cylinder units for disc brakes are provided. Such flexible sheathing may be arranged in a retracted condition wherein the piston is completely accommodated within the cylinder and in an extended condition wherein the piston is completely extracted from a caliper body defining the cylinder. Pistons incorporating such flexible sheathings and calipers incorporating such pistons are also provided.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: August 13, 2019
    Assignee: Freni Brembo S.p.A.
    Inventors: Fabio Scotti, Antonio Gotti, Armando Puddu
  • Patent number: 10308309
    Abstract: A control device for a bicycle, has a first body adapted to be attached to a bicycle handlebar, at least one control member of at least one bicycle component, and a second body, distinct from the first body, connected to the first body to increase a grip surface of the control device and/or to vary the relative position of the at least one control member with respect to the handlebar of the bicycle, so as to adapt the control device to the size of the cyclist's hand.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: June 4, 2019
    Assignee: CAMPAGNOLO S.R.L.
    Inventor: Giuseppe Dal Pra'
  • Patent number: 10300900
    Abstract: A master cylinder includes: a cylinder housing; a piston which is movably disposed in the cylinder housing so as to form a pressure chamber and a hydraulic fluid supplying chamber; a sealing member which is interposed between the cylinder housing and the piston. The piston has a plurality of communication holes for connecting the pressure chamber and the hydraulic fluid supplying chamber, and the plurality of communication holes are formed on a slanted surface which is provided to an outer surface of the piston.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: May 28, 2019
    Assignee: ERAE AMS CO., LTD.
    Inventors: Bu-Geun Mun, Jong-Dae Weon, Yu-Jong Seo
  • Patent number: 10252706
    Abstract: A master cylinder includes: a cylinder housing; a piston which is movably disposed in the cylinder housing so as to form a pressure chamber and a hydraulic fluid supplying chamber; and a sealing member which is interposed between the cylinder housing and the piston. An indentation portion is provided on an outer circumferential surface of the piston, wherein a rear wall of the indentation portion is formed as a slanted surface. A plurality of first communication holes are formed on a bottom surface of the indentation portion and a second communication hole is formed on the rear wall of the indentation portion.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: April 9, 2019
    Assignee: ERAE AMS CO., LTD.
    Inventors: Ju-Hyung Jo, Dong-Hyun Lee
  • Patent number: 10189539
    Abstract: A master cylinder for a hydraulic brake comprises a compensating chamber, a cylinder in which a piston is movably disposed, a pressure chamber disposed in the cylinder and connected to the compensating chamber through at least one connecting opening, and a gasket for interrupting the connection between the pressure chamber and the compensating chamber. The gasket seals the compensating chamber and the pressure chamber against the environment.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: January 29, 2019
    Assignee: Gustav Magenwirth GmbH & Co. KG
    Inventor: Michael Ruopp
  • Patent number: 10183721
    Abstract: A bicycle control device is basically provided with a mounting bracket, a hydraulic unit and a shift unit. The mounting bracket includes a handlebar clamp defining a handlebar mounting axis. The hydraulic unit is provided on the mounting bracket and includes a cylinder housing defining a cylinder bore, a hydraulic reservoir and a piston. The hydraulic reservoir is fluidly connected to the cylinder bore. The piston is movably disposed in the cylinder bore along a cylinder axis of the cylinder bore. The shift unit is provided on the mounting bracket and includes a wire take-up member pivotable about a take-up axis. The wire take-up member of the shift unit and the hydraulic reservoir are disposed between the handlebar mounting axis and the cylinder axis as viewed along a first direction parallel to the take-up axis of the wire take-up member.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: January 22, 2019
    Assignee: SHIMANO COMPONENTS (MALAYSIA) SDN. BHD.
    Inventors: Chee Keong Ng, Sui Cheng Ng
  • Patent number: 10173655
    Abstract: Disclosed herein is a master cylinder for a brake system. The master cylinder for a brake system comprises a cylinder body in which a bore is formed, at least one piston provided to be movable forward and backward in the bore, a hydraulic chamber pressurized by the piston, an oil port connected to a reservoir and configured to supply oil to the hydraulic chamber of the cylinder body, and a sealing member installed in the cylinder body and configured to block a flow of oil between the oil port and the hydraulic chamber according to a movement of the piston, wherein the piston includes a piston groove having an inclined surface in contact with the sealing member and a plurality of piston holes formed along an outer circumferential surface of the piston groove configured to communicate the oil port with the hydraulic chamber.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: January 8, 2019
    Assignee: MANDO CORPORATION
    Inventor: Jae-Yoon Kim
  • Patent number: 10011256
    Abstract: A master cylinder apparatus includes: an input piston that can be moved forward by operating a brake operating member; a pressure piston that is provided in front of the input piston to be capable of moving relative to the input piston; and a stroke velocity ratio modification device that is capable of modifying a stroke velocity ratio, which is a ratio between a stroke velocity of the pressure piston and a stroke velocity of the input piston, in at least two stages while the input piston moves from a rear end portion position to a front end portion position, and that sets the stroke velocity ratio at 1 when an abnormality occurs—in the master cylinder apparatus.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: July 3, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Hiroshi Isono
  • Patent number: 9925966
    Abstract: A brake master cylinder arrangement includes a housing with a cylindrical recess, a pressure piston moveable in the cylindrical recess along a longitudinal axis and guided in a sealing manner, and a reservoir for storing brake fluid that is fluidically connected via a fluid channel to the housing. The pressure piston and the housing enclose a pressure chamber that is connected to a fluid circuit of the brake system. Depending on the position of the associated pressure piston, the pressure chamber is either fluidically connected to the fluid reservoir or disconnected therefrom. In a region that axially spans the sealing arrangement in a starting position of the pressure piston, the outer circumferential surface of the pressure piston has profiling that provides a fluidic connection between the fluid reservoir and the pressure chamber.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: March 27, 2018
    Assignee: Lucas Automotive GmbH
    Inventors: David Lopéz-Larequi, Hans-Martin Giese
  • Patent number: 9765763
    Abstract: A device is described for receiving and dispensing hydraulic fluid, in particular for a hybrid or electric vehicle, having a cylinder, a piston, which is movable in the cylinder for receiving and dispensing hydraulic fluid, and a drive unit; a ramp mechanism being provided, having at least one ramp on which at least one rolling element rolls for moving the piston, the ramp mechanism being situated between a face of the piston and a face of a gearwheel driven by the drive unit.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: September 19, 2017
    Assignee: Robert Bosch GMBH
    Inventors: Bertram Foitzik, Willi Nagel
  • Patent number: 9643579
    Abstract: A primary piston composed of a skirt and an intermediate back wall having a rear face receiving the servobrake thrust rod and a forward face for the telescoping rod and the spring pushing the secondary piston. The front of the skirt has longitudinal grooves open in front and closed in the rear. The thickness of the skirt beneath the grooves and the part of the skirt between two successive grooves in the peripheral direction form a front face enabling the principal piston to push the secondary piston. The principal piston is made of a single piece of plastic material.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: May 9, 2017
    Assignee: ROBERT BOSCH GMBH
    Inventors: Marc Rodriguez, Olivier Bernadat, Laurent Lhuillier, Marc Noblet, Julien Gateau, Daniel Grech, Carole Charpentier
  • Patent number: 9618058
    Abstract: An actuator system for hydraulic actuation of a clutch comprises a master cylinder with a master piston, a readjustment container for containing hydraulic fluid, a connection opening between the readjustment container and the master cylinder, where a degree of openness of the connection opening is dependent on the position of the master piston, and a hydraulic actuator to control a position of the master piston. In an actuator system, a control device for controlling the hydrostatic actuator is also provided, such that a speed of motion of the master piston is high while the connection opening is wide open, and low while the connection opening is open a little. In a method according to the disclosure, a position of the master piston is detected, and the actuator is controlled at different speeds depending on the position or the degree of openness.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: April 11, 2017
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Marco Treder, Reinhard Stehr
  • Patent number: 9452745
    Abstract: A master cylinder for a controlled brake system, including at least one piston which is displaceable in a housing and is sealed with respect to a pressure chamber by a sealing element arranged in an annular groove of the housing, which pressure chamber is connectable to an unpressurized supply chamber by control passages formed in the piston. The piston 46 is formed in at least two parts, including a main body and an annular control element, the control passages being provided in the control element.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: September 27, 2016
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Harald König, Peter Drott, Udo Jungmann, Andreas Bischoff
  • Patent number: 9387904
    Abstract: A hydraulic pump including a containment body (2) having inside a cylindrical cavity (3) provided with a conduit (4) communicating with a hydraulic actuator and capable of holding a fluid. A piston (5) is movable in the cylindrical cavity (3) and a reservoir (12) of the fluid is in fluid communication with the cylindrical cavity (3). An actuation device (6) connected to the piston (5) move the piston (5) within the cylindrical cavity (3) to operate the hydraulic actuator. The pump also comprises structure (13) for closing or opening the connection between the reservoir (12) and the cylindrical cavity (3). The reservoir (12) is substantially lined up with the cylindrical cavity (3) along an axis of longitudinal development (X) of same cylindrical cavity (3), so as to reduce the overall dimensions and the weight of the pump.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: July 12, 2016
    Assignee: FORMULA S.A.S. DI “FORMULA GROUP S.R.L.” & C.
    Inventors: Giancarlo Vezzoli, Gabriele Di Pietro, Samuele Laghi, Marco Fiesoli
  • Patent number: 9381894
    Abstract: Disclosed is an integrated braking system including a hydraulic piston cylinder unit that is operated by a brake pedal, a pressure medium storage unit that is connected to the hydraulic piston cylinder unit, a pressure generating unit that is driven by a motor, and has first and second hydraulic chambers that are divided by a piston movable within a housing, and a pressure control unit that transmits a pressure to a wheel unit from the hydraulic piston cylinder unit and the pressure generating unit. A hydraulic line directly connects the first hydraulic chamber and the pressure medium storage unit.
    Type: Grant
    Filed: May 2, 2014
    Date of Patent: July 5, 2016
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventor: Chang Hoe Koo
  • Patent number: 9303640
    Abstract: A piston pump includes a piston assembly having at least one cross bore and a longitudinal bore corresponding to the at least one transverse bore, a cylinder, into which the piston assembly is guided in a longitudinally movable manner, and an inlet valve with a cage element, in which an inlet valve spring and an inlet valve sealing element are disposed, and a corresponding inlet valve seat, which is disposed on the piston assembly. Fluid flows through the longitudinal bore into a compression chamber via the inlet valve. A return spring is disposed in the compression chamber. The cage element has a resilient high-pressure sealing element that is configured to receive radially acting power components, and to effect a seal against a cylinder wall via a radial sealing surface, and in order to effect an axial seal against the piston assembly via an axial sealing surface.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: April 5, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Heiko Jahn, Marc Zimmermann
  • Patent number: 9239110
    Abstract: Master-cylinder seal housed in a groove around a piston has a core connected to three annular and concentric lips. The core rests against a side of the groove and has: a surface provided with an interior edge followed by a peripheral platter cut by at least one channel, and an exterior crown provided with a connection zone formed by an interruption in the crown and deformable due to pressure within the seal to recreate the crown's continuity and impermeability while facilitating purging the brake system when there is no pressure in the channel and the connection zone.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: January 19, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Laurent Lhuillier, Marc Noblet, Olivier Bernadat, Serge Aquino, Julien Gateau, Marc Rodriguez
  • Patent number: 9156455
    Abstract: The invention relates to an assembly including a pressure medium reservoir and a manually actuable master cylinder, in particular for a hydraulic motorcycle brake system, wherein the pressure medium reservoir is connected permanently to the master cylinder by at least one pressure medium connection, wherein the master cylinder has at least one pressure chamber, which can be connected to wheel brakes. According to the invention, provision is made for a protection device to be arranged in the region of the pressure medium connection, the device preventing air from penetrating into the pressure chamber and allowing air to escape in the direction of the pressure medium reservoir.
    Type: Grant
    Filed: July 5, 2010
    Date of Patent: October 13, 2015
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Stefan A. Schmitt, Peter Tandler, Werner Krebs, Stephan Schlicht, Hans-Jürgen Neumann, Christoph Schiel
  • Patent number: 8991171
    Abstract: A cup for a master cylinder coming into contact with its primary piston or its secondary piston and subjected to the pressure of the brake fluid of the primary chamber and of the secondary chamber. The cup has two large grooves bordered: by a rib between the heel and the first groove, by a rib between the first groove and the second groove, by a rib between the second groove and the small grooves, these ribs being in protrusion relative to the cylindrical surface of the heel in the mounted position of the cup in order to separate the heel from the surface of the piston and form, between the heel and the surface of the piston, a gap with a film of brake fluid. Master cylinder notably a tandem master cylinder fitted with such cups.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: March 31, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Olivier Bernadat, Marc Noblet, Julien Gateau, François Gaget, Marc Rodriguez
  • Publication number: 20150047338
    Abstract: A circumferential wall of a circumferential groove near a bottom section of a cylinder main body has an outer wall section extending from a bottom section of the circumferential groove in a radial direction of the cylinder main body, a stepped surface section extending from the outer wall section in a bottom direction of the cylinder main body, and an inner wall section having a flat surface section parallel to the radial direction of the cylinder main body and formed further inside in the radial direction of the cylinder main body than the stepped surface section. The inner wall section is formed at a position at which the center lip section first abuts the inner wall section prior to the outer wall section when the seal member moves toward the bottom section of the cylinder main body.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 19, 2015
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Seiko Tanabe, Yoichi Kumemura
  • Patent number: 8925314
    Abstract: In order to make the idle stroke which occurs as small as possible in a master cylinder, in particular for a clutch, actuating or brake system of a vehicle, comprising a cylinder housing with a piston bore, a piston arranged in the piston bore and having an end side facing a cylinder chamber and at least one afterflow opening which leads from a piston skirt surface through a piston wall to the cylinder chamber at a distance from the end side and adjoins an afterflow space in a pressure equalization position of the piston so that in the pressure equalization position hydraulic medium can run on into the cylinder chamber in order to equalize the pressure, and an inner sealing element which is arranged between the housing and the piston in the area of the piston bore and limits the cylinder chamber, it is suggested that the afterflow space be arranged between the sealing element and the piston skirt surface on a side of a sealing lip of the sealing element facing away from the cylinder chamber and that in the pr
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: January 6, 2015
    Assignee: Gustav Magenwirth GmbH & Co. KG
    Inventor: Michael Ruopp
  • Patent number: 8904782
    Abstract: Disclosed herein is a hydraulic master cylinder body having a bore defined at least in part by a bore wall, wherein the bore wall includes an opening for hydraulic fluid to be passed into the bore, and a piston assembly situated at least substantially in the bore, the assembly having a piston with a piston body and at least one cup seal situated substantially around the piston body, the cup seal situated adjacent to the bore wall so as to be in sealing engagement therewith, and a back-up ring that is situated about the piston body, wherein the back-up ring is positioned to at least partially cover a portion of the cup seal that is adjacent to the bore wall and to prevent at least a portion of the cup seal from contacting the bore wall and the opening for hydraulic fluid during piston actuation.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: December 9, 2014
    Assignee: HB Performance Systems, Inc.
    Inventors: Jeffrey S. Gohr, Vesa Ahola, James Dimsey
  • Patent number: 8677746
    Abstract: A brake booster includes a housing, a retention cuff, and a spring. The housing defines a passage to an interior chamber. The retention cuff is positioned in the interior chamber about the passage. The spring engages the retention cuff in the interior chamber. The master cylinder arrangement includes a tube member and a brake fluid reservoir. The tube member includes a first end and a second end. The tube member extends through the passage and the retention cuff such that the first end of the tube member is exposed to the interior chamber of the brake booster. The brake fluid reservoir is in fluid communication with the tube member.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: March 25, 2014
    Assignee: Robert Bosch GmbH
    Inventor: John E. Mackiewicz
  • Patent number: 8646269
    Abstract: A cup seal includes a base portion disposed on a cylinder bore opening portion side of a seal groove, an inner circumferential lip portion extended from an inner circumferential side of the base portion toward a cylinder bore bottom portion and having an inner circumferential surface slidably abutting against an outer circumferential surface of a piston (plunger), and an outer circumferential lip portion extended from an outer circumferential side of the base portion toward the cylinder bore bottom portion and having an outer circumferential surface abutting against a seal groove bottom surface. The cup seal also includes an abutment surface and contact pressure adjustment surface.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: February 11, 2014
    Assignee: Nissin Kogyo Co., Ltd.
    Inventor: Mitsuhiro Hanaoka
  • Patent number: 8646268
    Abstract: Disclosed herein is a master cylinder for a vehicle. The master cylinder includes a housing, a piston, inlet ports and a seal. The housing has therein a liquid pressure chamber to contain oil. The piston reciprocates in the liquid pressure chamber to control the pressure in the liquid pressure chamber. A front end of the piston has a stepped structure. The inlet ports are provided in the housing so that oil is supplied into the liquid pressure chamber through the inlet ports. The seal is seated into a seating depression which is formed in the inner surface of the housing. The seal opens or closes a flow path of the oil depending on whether the seal is brought into contact with the piston. The oil flows into the liquid pressure chamber along the stepped outer surface of the piston through a space defined between the piston and the seal.
    Type: Grant
    Filed: January 22, 2009
    Date of Patent: February 11, 2014
    Assignee: Korea Delphi Automotive Systems Corporation
    Inventors: Young Taek Kim, Sang Bo Kim, Jong Dae Weon, Tae Jun Ha
  • Patent number: 8607689
    Abstract: A sealing member for a piston slidably disposed within the cylinder bore of a hydraulic system includes a seal body having an outer sealing surface arranged to contact the cylinder bore and a glide ring at least partially disposed within the outer sealing surface of the seal body. The glide ring includes an outer surface and the outer sealing surface of the seal body includes at least one seal lip projecting beyond the outer surface of the glide ring.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: December 17, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Roger Miller, Milan Klimes, Brian Edward Roach
  • Patent number: 8590304
    Abstract: Master cylinder of a hydraulic braking circuit, particularly for a motor vehicle, comprising a piston (2) sliding axially in a body (4) comprising an annular lip seal (51) produced by molding, and comprising an internal, dynamic sealing lip (14) surrounding the piston and connected by a curved surface (36) to a planar rear face (30) comprising radial passages which are defined by blocks formed as projections on the rear face of the seal, these blocks being separated from the curved surface (36).
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: November 26, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Olivier Bernadat, François Gaffe, Laurent Lhuillier, Antony Auguste
  • Patent number: 8578710
    Abstract: A cup seal (21) of the invention includes an intermediate lip portion (21d), positioned between an inner lip portion (21b) and an outer lip portion (21c), provided in a base portion (21a). The intermediate lip portion (21d) is configured in such a way that first intermediate lip portions (21d1), communication passages (21d3), second intermediate lip portions (21d2), whose axial direction length is less than that of the first intermediate lip portions (21d1), and the communication passages (21d3), which have no lip portion, are cyclically disposed, in this order, in the peripheral direction. An easy elastic deformation portion of the base portion (21a) which elastically deforms easily is formed by the second intermediate lip portions (21d2) and communication passages (21d3) and, by the easy elastic deformation portion elastically deforming easily when supplying liquid, a flow passage with a larger passage area is formed.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: November 12, 2013
    Assignee: Bosch Corporation
    Inventors: Tomohiro Aoki, Masaki Shiwa
  • Patent number: 8578711
    Abstract: A master cylinder includes a cylinder body which an operating fluid is introduced from a reservoir, a piston which is slidably fitted in the cylinder body and defines a pressure chamber inside the cylinder body, a supply pathway which is formed in the cylinder body and supplies the operating fluid from the reservoir to the pressure chamber, a bypass pathway which bypasses the supply pathway and allows the reservoir to communicate with the pressure chamber, and a check valve which is installed in the bypass pathway and opens a valve when the pressure inside the pressure chamber is lower than the pressure of the reservoir.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: November 12, 2013
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Ryoichi Yagi, Naganori Koshimizu, Takato Ogiwara
  • Patent number: 8561402
    Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle. The master cylinder assembly generally includes a housing mountable to a frame member of the handlebar-steered vehicle and having a chamber including a fluid cavity with first and second fluid cavity regions. The first fluid cavity region is in fluid communication with the hydraulic actuation system. The housing includes discrete first and second housing portions. The first housing portion has first and second end portions. The first end portion of the first housing portion extends axially into the second fluid cavity region creating an annular gap radially outboard of the first end portion extending into the second fluid cavity region. The second end portion of the first housing portion is connected to the hydraulic actuation system. A piston assembly includes a piston slidably disposed within the fluid cavity.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: October 22, 2013
    Assignee: SRAM, LLC
    Inventors: Charles Emmett Dunlap, III, Braden Snead
  • Patent number: 8539766
    Abstract: A master cylinder includes a cylinder bore, a first piston positioned within the cylinder bore, a second piston positioned within the bore and located forwardly of the first piston, a first pressure chamber within the cylinder bore and defined in part by a rear portion of the second piston and a forward portion of the first piston, a first pressure chamber seal extending radially outwardly from the rear portion of the second piston, a first reservoir inlet configured to provide fluid communication between a reservoir and the cylinder bore at a location forwardly of the first pressure chamber seal, and a first groove extending axially along the cylinder bore and positioned such that (i) when the second piston is in a released position, the first groove is located directly outwardly of the first pressure chamber seal and the reservoir is in fluid communication with the first pressure chamber through the first groove, and (ii) when the second piston is in an activated position, the first pressure chamber seal is
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: September 24, 2013
    Assignee: Robert Bosch GmbH
    Inventor: Andrew Paul Wasson
  • Patent number: 8434304
    Abstract: A cup seal 21 includes a base portion 21a disposed on a cylinder bore opening portion side of a seal groove, and an inner lip portion 21b extended from an inner circumferential side of the base portion toward a cylinder bore bottom portion and having an inner circumferential surface slidably abutting against an outer circumferential surface of a piston. In a state where the cup seal 21 is fitted into the seal groove and a plunger 19 is inserted into a cylinder bore 12, an abutting force maximum portion 21m where an abutting force against the plunger 19 becomes maximum within an inner circumferential surface of the cup seal 21 is provided on an end portion on the cylinder bore opening portion side of an inner circumferential surface part of the base portion 21a.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: May 7, 2013
    Assignee: Nissin Kogyo Co., Ltd.
    Inventor: Mitsuhiro Hanaoka
  • Patent number: 8407996
    Abstract: A projection (21b4) provided at a tip portion of an inner lip portion (21b) of a first cup seal (21) comes in contact with a second side wall (20c) of a recessed portion (20) and a large axial force is exerted in the axial direction on a first tapered inner peripheral surface (21b1) of the first cup seal (21) from a rear side tapered surface (4b2) of a primary piston (4). This makes it possible to reliably hold the first cup seal (21) in the axial direction by utilizing the axial force. Therefore, the first cup seal (21) can be suppressed from moving in the axial direction. In particular, the projection (21b4) of the first cup seal (21) comes in contact with a tapered surface (20c?) of the second side wall (20c) to obtain a further increased axial force, and the first cup seal (21) can be held more reliably.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: April 2, 2013
    Assignee: Bosch Corporation
    Inventors: Tomohiro Aoki, Masaki Shiwa, Kazuhisa Taira
  • Patent number: 8376113
    Abstract: An actuation device and a method for actuating a clutch, in particular for a hybrid drive, include a master cylinder having an interior separated by a master piston into master and slave oil chambers. The slave oil chamber is connected, via a valve in a first valve position, to a tank line leading to an oil reservoir and in a second valve position, to a pressure line of the oil reservoir. The master oil chamber is connected via a working line to an oil chamber of a slave cylinder and to a compensating tank via a compensating line as a function of the position of the master piston. The compensating tank has a compensating volume which has, at its highest point, an overflow which is connected to the tank line and in its first position the valve connects the slave oil chamber to the compensating tank via a return line.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: February 19, 2013
    Assignee: Volkswagen Aktiengesellschaft
    Inventors: Georg Kruse, Roland Meyer, Markus Novotny
  • Patent number: 8347623
    Abstract: A cup seal 21 includes a base portion 21a disposed on a cylinder bore opening portion side of a seal groove, an inner circumferential lip portion 21b extended from an inner circumferential side of the base portion toward a cylinder bore bottom portion and having an inner circumferential surface slidably abutting against an outer circumferential surface of a piston (plunger), and an outer circumferential lip portion 21c extended from an outer circumferential side of the base portion toward the cylinder bore bottom portion and having an outer circumferential surface abutting against a seal groove bottom surface.
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: January 8, 2013
    Assignee: Nissin Kogyo Co., Ltd.
    Inventor: Mitsuhiro Hanaoka
  • Patent number: 8286427
    Abstract: In a master cylinder, a supply passage for supplying operating liquid from a reservoir (2) to a pressure chamber (6) is provided in a cylinder body (3) coupled with the reservoir. A bypass passage (37) for bypassing the supply passage and connecting the reservoir and the pressure chamber is further provided, and a check valve (34) adapted to open when a pressure in the pressure chamber is lower than that in the reservoir is disposed in the bypass passage. A valve case (38) containing a valve body (41) of the check valve includes a valve seat (40) and a cylindrical wall (45) for slidably guiding the valve body which are integrally formed as a single member.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: October 16, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Takato Ogiwara, Takayuki Kinoshita
  • Patent number: 8209978
    Abstract: The invention relates to a motor vehicle master cylinder (1). More specifically, the invention relates to a piston (4, 5) of the master cylinder which has a first indentation (24) and a second indentation (27), which indentations are formed upstream of a port (13, 14) of the piston. The first indentation and the second indentation delimit a space within which hydraulic brake fluid can be stored so that it can be tapped off by an auxiliary braking device of the E.S.P. type.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: July 3, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Yannick Nen, Omar Brahml, Marc Noblet, Dominique Rault, Philippe Bourlon, Lionel Bourgols, Jérémy Labarre
  • Patent number: 8156740
    Abstract: The invention relates to a master cylinder (1) with reduced free travel (23). Current master cylinders have a free travel during the displacement of a piston (6) in a bore (5) of a master cylinder body (3). Such a free travel may be reduced with the aid of a frustoconical portion (24) in the piston, an orifice (14) for communication of hydraulic fluid being situated on said inclined wall, a gap (26) between the inclined wall and an inner wall (12) of the bore allowing a passage for hydraulic fluid capable of filling a pressure chamber (4). However, such inclined walls create a change in the slope of an outer wall (29) of the piston, this change being able to cause a separation of an inner lip (19) of a sealing cup (17). To prevent this separation, the invention provides that the inclined wall forms a convex rounded surface (32).
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: April 17, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Olivier Bernadat, François Gaffe, Laurent Lhuillier, Antony Auguste, Carole Charpentier
  • Patent number: 8109088
    Abstract: Our problem relates to a master cylinder with a U-shaped seal. Our goal is to avoid defective bleeding of hydraulic braking systems. The defects arise out of the fact that the vacuum causes the lips of the seal (21) to stick together and to stick against the wall (41). To achieve this, reliefs (42) will be created on one wall (44) of one lip (28) facing the other lip (27) and on the edge face (50) of this same lip. These reliefs will prevent the lips from sticking tightly to one another and to the wall facing the edge face of the lips. This lack of sticking will prevent a vacuum from being created between the two lips and between the edge face of the lips and the wall (41). As a result, the seal will be able to return to a position in which bleeding can be performed effectively.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: February 7, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Daniel Grech, Antony Auguste, Lionel Bourgois, Nicolas Quiniou, Marc Noblet, Stéphane Lacroix, Omar Brahmi
  • Patent number: 8051657
    Abstract: According to the plunger-typed master cylinder of the invention, because deformation of seal cups fitted in the hydraulic pressure chambers with the pistons (primary piston and floating piston) inserted is minimized, that is, the deformation of the inner flange being in contact with pistons does not substantially affect the outer flange being in contact with hydraulic pressure chambers when the master cylinder is in operation, it is possible to prevent deterioration in the performance of passing or stopping oil due to the deformation of seal cups and durability.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: November 8, 2011
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Seonghun Kim
  • Patent number: 8046996
    Abstract: A master cylinder assembly for a hydraulic actuation system for a handlebar-steered vehicle including a fluid cavity having an adjustable length. The master cylinder assembly generally includes a housing, a piston assembly, an actuator and an adjuster. The housing is mountable to a frame member and includes a chamber having a fluid cavity with first and second regions. The first region is in fluid communication with the hydraulic actuation system. The piston assembly includes a piston slidably disposed within the fluid cavity. The actuator is operatively connected to the housing and operatively connected to the piston to slidably displace the piston between an open fluid circuit position permitting fluid flow between the first and second regions and a closed fluid circuit position blocking fluid flow between the first and second regions. The adjuster is operatively connected to the housing to adjust a length of the fluid cavity.
    Type: Grant
    Filed: February 23, 2009
    Date of Patent: November 1, 2011
    Assignee: SRAM, LLC
    Inventor: Charles Emmett Dunlap, III
  • Patent number: 7997075
    Abstract: A master cylinder 1, especially for a controlled brake system, includes at least one piston 3, 4; 53, 54 displaceable in a housing 2, which is sealed in relation to a pressure chamber 7, 8 by means of a sealing element 5, 6 arranged in an annular groove 23, 24 of the housing 2, said pressure chamber being connectable to an unpressurized supply chamber 11, 12 by means of transverse bores 9, 10; 50, 51 provided in the piston 3, 4; 53, 54. Several recesses 15, 16, 17 are arranged on an inside surface 13, 14; 59, 60 of the piston 3, 4; 53, 54 into which the transverse bores 9, 10; 50, 51 open.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: August 16, 2011
    Assignee: Continental Tevas AG & Co.
    Inventors: Peter Drott, Harald König, Udo Jungmann, Andreas Bischoff, Jörg Loke, Mathias Küster
  • Patent number: 7987671
    Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which is slideably mounted at least one axial piston, of the type in which the bore (14) comprises two seals, front and rear, interposed between the piston and the bore (14), characterized in that it comprises at least one wide groove (66, 68) which is formed in the bore (14) in front of a groove (70, 72) for retaining the front seal, which extends at least in part around the piston, and which communicates with said retaining groove (70, 72) and the hole in the piston, in order to allow resupplies to occur with a high flow rate.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: August 2, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Francois Gaffe, Antony Auguste, Laurent Lhuillier, Andrew Wasson
  • Patent number: 7966813
    Abstract: A sealing element seals a pressure piston which is movably arranged in a housing of a brake cylinder. The sealing element may be inserted into a ring-shaped groove which is provided in the housing. The sealing element includes an outer sealing lip for contact with a floor of the ring-shaped groove, an inner sealing lip for contact with the pressure piston, and a sealing element back. At least one non-sealing spacer element is provided on the sealing element back.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: June 28, 2011
    Assignee: Lucas Automotive GmbH
    Inventor: Martin Struschka
  • Patent number: 7963113
    Abstract: A cup seal 21 includes a base portion 21a, an inner circumferential lip 21b slidingly contactable with a plunger 19 and an outer circumferential lip 21c contactable with the bottom surface 26a of the seal groove 26. Further, on the cup seal 21, there are provided elastic projections 21d projecting from the outer circumferential side leading end of the inner circumferential lip 21b toward the cylinder hole bottom portion. The length of the cup seal 21 from the base end face 21e to the leading end portions 21f is set longer than axial length of the seal groove 26. When the cup seal 21 is fitted into the seal groove 26, force is imparted on the inner circumferential lip 21b toward the cylinder hole inner circumferential direction to energize the inner circumferential lip 21b toward the piston all the time.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: June 21, 2011
    Assignee: Nissin Kogyo Co., Ltd.
    Inventors: Mitsuhiro Hanaoka, Osamu Ueno, Toshiaki Mitani, Takayoshi Shinohara
  • Patent number: 7937940
    Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which at least one axial piston is slideably mounted, of the type in which the bore (14) comprises two seals, front (30, 34) and rear, interposed between the piston and the bore (14), the seals (30, 34) comprising three radially concentric lips accommodated in grooves (70, 72) in the bore (14), characterized in that front faces of the grooves (70, 72) are configured at least in part as a slope.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: May 10, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Francois Gaffe, Antony Auguste, Laurent Lhuillier, Olivier Bernadat