Annular Reservoir Patents (Class 188/315)
  • Patent number: 10704641
    Abstract: A shock absorber includes a pressure tube forming a working chamber. A reserve tube is concentric with and radially outward from the pressure tube. A baffle is positioned radially outward from the pressure tube. A reservoir chamber is formed between the reserve tube and the baffle. A piston is attached to a piston rod and slidably disposed within the pressure tube. A rod guide is attached to the pressure tube and supports the piston rod. An electromechanical valve is positioned within the rod guide. A plurality of non-linear passageways are disposed between the baffle and at least one of the pressure tube and the reserve tube for transporting fluid between the electromechanical valve and the reservoir chamber.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: July 7, 2020
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventors: Matthew L. Roessle, Michael Golin
  • Patent number: 10618369
    Abstract: A method and apparatus for a shock absorber for a vehicle having a gas spring with first and second gas chambers, wherein the first chamber is utilized during a first travel portion of the shock absorber and the first and second chambers are both utilized during a second portion of travel. In one embodiment, a travel adjustment assembly is configured to selectively communicate a first gas chamber with a negative gas chamber.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: April 14, 2020
    Assignee: Fox Factory, Inc.
    Inventors: Andrew Laird, Sante M. Pelot, William M. Becker, Dennis K. Wootten
  • Patent number: 10556477
    Abstract: A vehicle damper is described. The vehicle damper includes: a cylinder; a piston within the cylinder; a working fluid within the cylinder; a reservoir in fluid communication with the cylinder via the working fluid, the reservoir operable to receive the working fluid from the cylinder in a compression stroke; a valve in a flow path between the cylinder and the reservoir; and a remotely-operable valve having a position allowing the working fluid to significantly by-pass the valve.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: February 11, 2020
    Assignee: Fox Factory, Inc.
    Inventor: John Marking
  • Patent number: 10557512
    Abstract: A vibration damper for a motor vehicle with a hydraulic unit and at least one valve for controlling the volume flow to the hydraulic unit, wherein the at least one valve and the hydraulic unit are arranged outside of the tube elements of the vibration damper and a motor vehicle including such vibration damper.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: February 11, 2020
    Assignee: ZF Friedrichshafen AG
    Inventors: Andreas Förster, Achim Thomae
  • Patent number: 10473178
    Abstract: Valve for a vibration damper having a valve housing and a valve slide movable in the valve housing to at least partially close at least one flow path of a fluid flowing through the valve. The valve has an input side and an output side. Pressure impingement surfaces of the valve slide are substantially equal for an opening pressure and for a closing pressure, and the valve slide has a restriction through which a pressure difference between opening pressure and closing pressure can be generated.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: November 12, 2019
    Assignee: ZF Friedrichshafen AG
    Inventor: Andreas Förster
  • Patent number: 10400847
    Abstract: A method and apparatus for a damper. The damper comprises a fluid chamber having a piston dividing the chamber into a compression and rebound sides, a reservoir in fluid communication with the compression side of the chamber, and an isolator disposed between the compression side and the reservoir, whereby the isolator obstructs fluid flow between the compression side and the reservoir. In one embodiment, a bypass provides a fluid path between the compression side and the isolator.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: September 3, 2019
    Assignee: Fox Factory, Inc.
    Inventor: John Marking
  • Patent number: 10393219
    Abstract: A clutch pedal vibration reduction apparatus configured for adjusting damping force, may include a vibration absorbing damper for absorbing vibration transmitted to a clutch pedal, wherein a space is formed in the vibration absorbing damper, an internal thread is formed at an inlet, and a damping force adjusting device for adjusting damping force is thread-coupled to the internal thread inside the space.
    Type: Grant
    Filed: May 10, 2017
    Date of Patent: August 27, 2019
    Assignee: Hyundai Motor Company
    Inventor: Jae-Sung Heo
  • Patent number: 10369859
    Abstract: In a motor vehicle chassis, at least one wheel suspension, which comprises a spring in the form of a coil spring, has associated therewith a hydraulic height adjustment device having a cylinder-piston arrangement which acts on a base point of the coil spring. The cylinder-piston arrangement can be supplied by a decentral hydraulic aggregate which is associated with the relevant wheel and comprises a storage container for hydraulic fluid and a hydraulic pump driven by an electric motor. At least the electric motor of the hydraulic aggregate is situated within the coil spring.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: August 6, 2019
    Assignee: HOERBIGER AUTOMOTIVE KOMFORTSYSTEME GMBH
    Inventors: Klaus Stolle, Gerhard Huber, Gisela Schleich, Jürgen Osterried, Peter Müller
  • Patent number: 10363788
    Abstract: A vibration damper is provided for a vehicle, preferably for a motor vehicle, having a wheel carrier made of metal for rotatably receiving a wheel, a damper tube arrangement at least partly made of a fiber-reinforced plastic for forming a damper fluid volume, a piston which is guided in the damper tube arrangement and includes a piston rod. The damper tube arrangement is rigidly connected to the wheel carrier and the piston rod can be connected to a body of the vehicle. A wheel carrier fluid volume is formed in the wheel carrier and which is connected to the damper fluid volume. The fluid in the wheel carrier fluid volume is in direct contact with the metal of the wheel carrier in order to transfer heat.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: July 30, 2019
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Andreas Reiser, Thomas Eifflaender, Michael Keigler, Johann Dudkowiak, Wolfgang Gruber, Matthias Stangl, Hubert Scholz, Thomas Kaespaizer, Martin Schwab
  • Patent number: 10308090
    Abstract: In a motor vehicle chassis, all four wheel suspensions each have associated therewith a hydraulic height adjustment device having a cylinder-piston arrangement which acts on a base point of the relevant spring and is supplied by a decentral hydraulic aggregate. The hydraulic height adjustment devices each comprise a complex, integrated electrohydraulic adjustment assembly comprising the allocated hydraulic aggregate and the associated cylinder-piston arrangement and having a specific adapter into which the allocated cylinder-piston arrangement is integrated in such a way that there are no exposed hydraulic lines between the allocated hydraulic pump and the associated cylinder-piston arrangement. The front wheel height adjustment devices and the rear wheel height adjustment devices differ in terms of the adapter.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: June 4, 2019
    Assignee: HOERBIGER AUTOMOTIVE KOMFORTSYSTEME GMBH
    Inventor: Klaus Stolle
  • Patent number: 10228040
    Abstract: A vibration damper with at least with at least two tube elements that are arranged one inside the other and a piston rod that is movable in a piston rod guide. A valve having a valve slide for at least partially closing at least one flow path of a fluid flowing through the valve is arranged in a region of one end of the piston rod guide. The valve has an input side and an output side. Pressure impingement areas of the valve slide are substantially the same size for an opening pressure and for a closing pressure, and the valve has a constriction via which a pressure difference between opening pressure and closing pressure can be generated.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: March 12, 2019
    Assignee: ZF Friedrichshafen AG
    Inventor: Andreas Förster
  • Patent number: 10208830
    Abstract: The hydraulic stop member comprises: a cup-shaped body mounted in a compression chamber of the shock-absorber. A piston is mounted at an end of a rod of the shock-absorber so as to slide in the cup-shaped body when the shock-absorber is close to an end-of-travel position of the compression stroke. The cup-shaped body includes a side wall and a bottom wall which define, along with the piston, a working chamber where a damping fluid of the shock-absorber is compressed by the piston. A bypass conduit connects a working chamber with the portion of the compression chamber placed above a seal ring. A pressure relief valve keeps the bypass conduit closed as long as the pressure in the working chamber remains below a given threshold value and to open the bypass conduit, thereby allowing the discharge of the damping fluid from the working chamber to the compression chamber through the bypass conduit, when the pressure in the working chamber exceeds the threshold value.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: February 19, 2019
    Assignee: SISTEMI SOSPENSIONI S.p.A.
    Inventors: Walter Bruno, Piero Antonio Conti, Giordano Greco
  • Patent number: 10156279
    Abstract: A shock absorber includes a first end and a second end that reciprocate relative to one another. The shock absorber includes a gas spring chamber, a damping chamber, and a floating piston. The first side of the floating piston is in fluid communication with the gas spring chamber. The second side of the floating piston is in fluid communication with the damping chamber. The gas in the gas spring chamber applies pressure against the floating piston, which applies pressure to the substantially incompressible fluid in the damping chamber. This pressure transfer may be adequate to minimize or prevent cavitation.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: December 18, 2018
    Assignee: Eko Sport, Inc.
    Inventor: Darek C. Barefoot
  • Patent number: 10145440
    Abstract: A piston section includes a valve seat that forms a first compression-side oil path through which oil flows in accordance with relative movement of a piston rod against a first cylinder, a first compression-side valve section that performs opening-closing of the first compression-side oil path of the valve seat, an inner annular section annularly formed as projecting in the axial direction of the valve seat from the valve seat toward the first compression-side valve, and an extending section that extends in the radial direction of the valve seat from an outer side of the inner annular section to a position at the inner side from a second oil path opening of the first compression-side oil path and projects in the axial direction from the valve seat toward the first compression-side valve section.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: December 4, 2018
    Assignee: SHOWA CORPORATION
    Inventors: Naoki Senou, Kenichiro Kaneko
  • Patent number: 10125841
    Abstract: A hydraulic strut system that damps vehicle vibration and includes a compressible fluid, a strut, and a valve plate. The strut includes three concentric tubes defining an inner cavity, an intermediary cavity, and an outer reservoir cavity, the inner cavity and intermediary cavity being fluidly coupled, wherein the inner cavity receives a piston that divides the inner cavity into a first volume and a second volume, the piston having an aperture that allows one way flow from the first volume to the second volume. The valve plate is removably coupled to the strut, and includes a first fluid path that allows one-way fluid flow from the intermediary cavity to the reservoir cavity, the first fluid path including a damping valve that damps fluid flowing therethrough; and a second fluid path that allows one-way fluid flow from the reservoir cavity to the inner cavity, the second fluid path further including a replenishment valve.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: November 13, 2018
    Assignee: Fluid Ride, Ltd.
    Inventors: Joshua Coombs, Jeremy Edmondson
  • Patent number: 9982738
    Abstract: A hydraulic device includes a tubular housing, inside of which a rod is jointly attached to a piston separating upper and lower areas which hold hydraulic fluid so that, as the piston and rod move, the piston and the rod move together relatively and axially inside the tubular housing, displacing the hydraulic fluid inside the tubular housing, flowing from one of the upper and lower areas to the other of the upper and lower areas, and thus changing the respective volumes inside the upper and lower areas. The hydraulic device further includes a modular mechanism located inside the lower area that regulates shock absorption at a maximum level of compression of the hydraulic device, as well as in other relative positions.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: May 29, 2018
    Assignee: KYB EUROPE HEADQUARTERS, GMBH
    Inventor: Javier Lizarraga Senar
  • Patent number: 9903426
    Abstract: A brake actuator comprises a housing having an end wall and a pushrod projecting through an opening in the end wall and terminating at a movable plate in the housing. A spring is enclosed in the housing and surrounds the pushrod. At least one unitary resilient member is disposed on the push rod proximate to the end wall and partially extends through the opening for centering the spring around an axis of the pushrod and restricting contamination into the housing. The unitary resilient member comprises a central aperture and an annular flange surrounding the central aperture. At least one section of a collar radially outward from the annular flange has a thickness less than half of the annular flange thickness for constraining movement of the spring and the push rod in a radial direction.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: February 27, 2018
    Assignee: Bendix Spicer Foundation Brake LLC
    Inventors: Brett S Darner, Zeeshan Phansopkar, Ronald S Plantan
  • Patent number: 9879748
    Abstract: A shock absorber has a housing with a piston rod assembly disposed therein. A first rod guide member is secured within a first portion of the housing so as to be concentrically disposed about at least a portion of the piston rod assembly. A second rod guide member is secured within the housing adjacent the first rod guide member so as to be concentrically disposed about at least another portion of the piston rod assembly. A digital valve assembly is disposed within the second rod guide member and fluidly couples chambers within the shock absorber.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: January 30, 2018
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventors: Matthew L. Roessle, Thomas P. Mallin, John McGahey, Jeffrey T. Gardner
  • Patent number: 9874263
    Abstract: To achieve the object described above, a shock absorber to solve the problem of the present invention includes a cover that covers an outer periphery of a cylinder which a reaction force air chamber forming member is slid ably in contact with, so that a slidable movement surface of the cylinder on which the reaction force air chamber forming member slidably moves is protected by the cover. Therefore, the slidable movement surface of the cylinder is not damaged by being hit by a flying stone or the like, an air tight property of the reaction force air chamber is maintained, and characteristics of an air spring included in the shock absorber do not change.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: January 23, 2018
    Assignee: KYB MOTORCYCLE SUSPENSION CO., LTD.
    Inventor: Nobuhiro Noguchi
  • Patent number: 9739330
    Abstract: The present disclosure relates to a shock absorber having a pressure tube which defines a fluid chamber, and a piston assembly. The piston assembly is disposed within the fluid chamber and divides the fluid chamber into upper and lower working chambers. A reserve tube surrounds the pressure tube to define a reservoir chamber between the reserve tube and the pressure tube. The pressure tube is disposed between a rod guide assembly and a lower mount. A structural integrity of the pressure tube is greater than a structural integrity of the reserve tube, and the pressure tube further operates as a principal load bearing component for the shock absorber.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: August 22, 2017
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventors: Koenraad Reybrouck, Thomas P. Mallin, Piotr Grzanka, Jacek Cylok, Frederik Balcaen
  • Patent number: 9652902
    Abstract: A method includes detecting at least one position measurement of a separator piston of a pitch trim actuator. The method includes detecting at least one pressure measurement of a gas. The method includes detecting at least one temperature measurement of the gas. The method includes storing at least one position value based on the at least one position measurement of the separator piston, at least one pressure value based on the at least one pressure measurement of the gas and at least one temperature value based on the at least one temperature measurement of the gas. The method includes determining a volume of an oil within an oil chamber of the pitch trim actuator and a pressure of the gas within the gas chamber of the pitch trim actuator, based on the at least one position value, the at least one pressure value and the at least one temperature value.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: May 16, 2017
    Assignee: Goodrich Corporation
    Inventors: Amir M. Fazeli, Adnan Cepic, Susanne M. Reber
  • Patent number: 9630471
    Abstract: A vehicular dust cover assembly including: an upper support; a bound stopper and a dust cover assembled to the upper support; and an engaging step provided on an outer circumferential surface of the bound stopper. A top end part of the dust cover is externally fit to a top end part of the bound stopper. The upper support includes an outer metal fitting having a fitting recess within which the top end part of the bound stopper is fit and assembled. An engaging projection is provided projecting on an inner surface of the fitting recess to be engaged with the engaging step with the dust cover interposed therebetween. The bound stopper includes an axial pushing operation surface exposed facing axially downward which is provided at a lower side than the engaging step and at a position inside the fitting recess.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: April 25, 2017
    Assignee: SUMITOMO RIKO COMPANY LIMITED
    Inventor: Kenichi Kato
  • Patent number: 9605726
    Abstract: A shock absorber is disclosed having a secondary dampening assembly for dampening movement of an inner assembly within the shock absorber. The secondary dampening assembly includes a hydraulic stop piston and a hydraulic stop sleeve. The hydraulic stop piston is carried by an extender with a gap defined radially between the hydraulic stop piston and the extender to allow radial movement. The hydraulic stop sleeve has an open end for receiving the hydraulic stop piston and a flow groove that extends longitudinally along an inner surface of the hydraulic stop sleeve.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: March 28, 2017
    Assignee: TENNECO AUTOMOTIVE OPERATING COMPANY INC.
    Inventors: Frederik Baldoni, Etienne Leruth
  • Patent number: 9592716
    Abstract: A pressure damping device includes: a cylinder; a piston provided movably in the cylinder in an axial direction of the cylinder, and formed to have a plurality of channels for liquid; a moving and partitioning member located between the piston and the cylinder, and provided movably from one end to the other end in the axial direction of a movable region provided in the piston, and configured to partition a space in the cylinder into a first liquid chamber and a second liquid chamber for storing the liquid; a first opening and closing member configured to open and close an opening in at least a part of the plurality of channels of the piston and open the opening; and a second opening and closing member configured to open and close an opening in at least a part of the plurality of channels and open the opening.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: March 14, 2017
    Assignee: SHOWA CORPORATION
    Inventors: Hiroshi Endo, Nobuo Mori
  • Patent number: 9441698
    Abstract: A hydraulic shock absorbing apparatus includes: an inner tube; and an outer tube that is placed outside the inner tube, in which a space is defined between an outer circumferential surface of the inner tube and an inner circumferential surface of the outer tube, and a protruding portion protruding from the outer circumferential surface of the inner tube toward the outer tube or a protruding portion protruding from the inner circumferential surface of the outer tube toward the inner tube is provided in the space, and the protruding portion is formed over an entire circumference of the outer circumferential surface of the inner tube or the inner circumferential surface of the outer tube, and has a waveform when viewed from a direction crossing the outer circumferential surface or the inner circumferential surface.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: September 13, 2016
    Assignee: SHOWA CORPORATION
    Inventors: Tatsuro Suzuki, Seiryo Konakai, Mototsugu Yamanaka, Yuichi Enomoto, Takahiro Miura, Kunio Shibasaki
  • Patent number: 9421990
    Abstract: The damping device (10) according to the invention is designed to damp a shock in a longitudinal direction (X). It includes a central pad (12), designed to be secured with a first member (14A) of the coupling device (14), and two side wings (18), each formed by a thin plate extending in the longitudinal direction (X). Each side wing (18) includes at least one first longitudinal region (20), secured to the central pad (12), at least one second longitudinal region (22), designed to be secured with a railroad vehicle, and at least one line of least resistance (24), separating the first (20) and second (22) longitudinal regions from each other, extending over the side wing (18) in the longitudinal direction (X).
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: August 23, 2016
    Assignee: ALSTOM TRANSPORTATION TECHNOLOGIES
    Inventor: Dominique Le Corre
  • Patent number: 9328790
    Abstract: A hydraulic shock absorber provides, a ring-shaped flow passage formed continuously along a circumferential direction between an outer circumference of a partition wall member and an inner circumference of an inner tube, in a range from an abutting surface to a screw coupling starting portion of a thread section of the inner tube; an outer side flow passage which is formed to a ring-shaped oil chamber side from a dividing member positioned on an open end surface side of the inner tube and which connects a ring-shaped oil chamber and the ring-shaped flow passage, an inner side flow passage which is formed in the partition wall member and which connects the ring-shaped flow passage and an oil reservoir chamber.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: May 3, 2016
    Assignee: SHOWA CORPORATION
    Inventor: Masao Shimasaki
  • Patent number: 8991572
    Abstract: A leak-proof damper with a self-diagnostic feature. An auxiliary oil reservoir body is disposed externally with respect to the damper cylinder and generally adjacent the rod seal, wherein the auxiliary oil reservoir body is concealed by an end cap. The maximum volume of oil retainable by the auxiliary oil reservoir body is predetermined to coincide with a volume of oil which may be lost from the interior of the damper cylinder and yet the damper will still function properly. The auxiliary oil reservoir body may be a seal body having an internal cavity providing an oil retention volume or an absorbent body having an absorbency capacity that provides an oil retention volume.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: March 31, 2015
    Assignee: GM Global Technology Operations LLC
    Inventor: Wenshui Wang
  • Patent number: 8973726
    Abstract: A hydraulic shock absorber includes: a cylinder which demarcates a piston oil chamber and a rod oil chamber; an outer cylinder body which demarcates between the cylinder and the outer cylinder body a reflux path that connects the piston oil chamber and the rod oil chamber with each other and which demarcates between a damper case and the outer cylinder body a reservoir chamber; and a valve structure mounted to the cylinder and the outer cylinder body. The valve structure has a valve for controlling an oil flow between the piston oil chamber and the reflux path and between the piston oil chamber and the reservoir chamber. The valve structure comprises a first valve structure mounted to an open end of the cylinder and a second valve structure mounted to an open end of the outer cylinder body. A cylinder assembly and an outer cylinder assembly are independently arranged.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: March 10, 2015
    Assignee: Showa Corporation
    Inventors: Takashi Tsukahara, Noriaki Maneyama
  • Publication number: 20150041266
    Abstract: A flow of hydraulic oil induced by sliding movement of a piston in a cylinder is controlled by a pilot-type main valve and a pilot valve, which is a pressure control valve, to generate a damping force. The pilot valve is adjusted in its valve-opening pressure with the thrust of a solenoid and adjusts the pressure in a back pressure chamber to control the valve-opening pressure of the main valve. A baffle plate is provided in a reservoir to isolate the surface of hydraulic oil in the reservoir from an inlet port through which the hydraulic oil flows into the reservoir from a damping force generating mechanism, thereby suppressing the occurrence of aeration and cavitation. The baffle plate is secured by inserting a connecting port through a positioning opening and holding a separator tube with a pair of arm portions.
    Type: Application
    Filed: October 28, 2014
    Publication date: February 12, 2015
    Inventors: Jin YAMASAKI, Shinichi KAGAWA, Tetsuo YOSHIDA
  • Publication number: 20150041265
    Abstract: A damping force generating mechanism is housed in a casing disposed at a side of an outer tube of a tube type shock absorber and secured by tightening a nut. The damping force generating mechanism is connected through a passage member to a branch pipe of a separator tube forming an annular passage communicating with a cylinder. The passage member has support portions formed on an abutting surface abutting against a main body. The support portions are disposed at the inner peripheral side of a seal groove on the abutting surface so as to abut directly against the main body. As the nut is tightened, an axial force is transmitted to the support portions from the center and its vicinities of the main body, causing a flange portion of the passage member to be pressed against a flange portion of the casing, thereby securing the passage member.
    Type: Application
    Filed: July 31, 2014
    Publication date: February 12, 2015
    Inventor: Mikio YAMASHITA
  • Patent number: 8931605
    Abstract: A fluid pressure damper is provided with a damper main body composed of an outer tube and an inner tube, a bottom member for sealing a bottom side opening of the damper main body, a suspension spring and a damper. The damper includes a cylinder storing a working fluid inside. The cylinder is inserted into the inner tube and fixed to the bottom member by being sandwiched between a head member fixed to a joint member coupled to the inner tube and the bottom member. The joint member includes a stopper member with the inner periphery of which the head member is threadably engaged, and a pin member which couples the stopper member to the inner periphery of the inner tube. The suspension spring is supported by the stopper member.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: January 13, 2015
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Hidetoshi Sugawara, Takahiko Jinnouchi, Takeshi Tomiuga
  • Patent number: 8899391
    Abstract: A flow of hydraulic oil induced by sliding movement of a piston in a cylinder is controlled by a pilot-type main valve and a pilot valve, which is a pressure control valve, to generate a damping force. The pilot valve is adjusted in its valve-opening pressure with the thrust of a solenoid and adjusts the pressure in a back pressure chamber to control the valve-opening pressure of the main valve. A baffle plate is provided in a reservoir to isolate the surface of hydraulic oil in the reservoir from an inlet port through which the hydraulic oil flows into the reservoir from a damping force generating mechanism, thereby suppressing the occurrence of aeration and cavitation. The baffle plate is secured by inserting a connecting port through a positioning opening and holding a separator tube with a pair of arm portions.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: December 2, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Jin Yamasaki, Shinichi Kagawa, Tetsuo Yoshida
  • Publication number: 20140339034
    Abstract: A damping valve includes an annular valve seat, a valve body, an actuator for driving the valve body and a valve case including a valve hole into which the valve body is slidably inserted. The valve body includes a valve main body and a shaft for transmitting a thrust force of the actuator to the valve main body. The valve main body includes a flange partitioning the interior of the valve hole into a valve seat side chamber and an opposite valve seat side chamber, a shaft portion extending from the flange and a valve head to be seated on and lifted from the valve seat. The valve seat side chamber and the opposite valve seat side chamber communicate via a communication passage and the valve seat side chamber and the flow path communicate via a throttle passage.
    Type: Application
    Filed: October 23, 2012
    Publication date: November 20, 2014
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventor: Takahisa Mochizuki
  • Publication number: 20140291090
    Abstract: A hydraulic shock absorber provides, a ring-shaped flow passage formed continuously along a circumferential direction between an outer circumference of a partition wall member and an inner circumference of an inner tube, in a range from an abutting surface to a screw coupling starting portion of a thread section of the inner tube; an outer side flow passage which is formed to a ring-shaped oil chamber side from a dividing member positioned on an open end surface side of the inner tube and which connects a ring-shaped oil chamber and the ring-shaped flow passage, an inner side flow passage which is formed in the partition wall member and which connects the ring-shaped flow passage and an oil reservoir chamber.
    Type: Application
    Filed: September 27, 2013
    Publication date: October 2, 2014
    Applicant: SHOWA CORPORATION
    Inventor: Masao SHIMASAKI
  • Patent number: 8840094
    Abstract: A self-pumping suspension strut with internal level regulation, for example for motor vehicles having a fluid-filled working cylinder pressurized with the pressure of the fluid acting as a spring. A hollow piston rod is guided, in a sealed manner, within the working space, into which projects a pump piston attached to the working cylinder. During relative movements between the working cylinder and the piston rod, fluid is delivered from the working space into a pressure chamber in which a pressure is higher than the pressure of the working space. Flow connections between the pressure chamber and the working space selective set a specifiable dynamic level, determined by the extension length of the piston rod, such that the piston rod can be rotated, by a rotating device, for selective cooperation of the axially and the circumferentially spaced flow connections to control flow.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: September 23, 2014
    Assignee: ZF Friedrichshafen AG
    Inventor: Markus Renninger
  • Publication number: 20140262654
    Abstract: A shock absorber has a housing with a piston rod assembly disposed therein. A first rod guide member is secured within a first portion of the housing so as to be concentrically disposed about at least a portion of the piston rod assembly. A second rod guide member is secured within the housing adjacent the first rod guide member so as to be concentrically disposed about at least another portion of the piston rod assembly. A digital valve assembly is disposed within the second rod guide member and fluidly couples chambers within the shock absorber.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicant: Tenneco Automotive Operating Company Inc.
    Inventors: Matthew L. Roessle, Thomas P. Mallin, John McGahey, Jeffrey T. Gardner
  • Patent number: 8820494
    Abstract: A hydraulic shock absorbing apparatus of a vehicle is described in which hydraulic shock absorbers are provided at both left and right sides of a wheel. One hydraulic shock absorber is provided with a compression side damping valve in one oil passage of a piston, is provided with a check valve in another oil passage, and is provided with a volume compensating oil passage of a piston rod communicated with an oil reservoir chamber in a piston rod side oil chamber. The other hydraulic shock absorber is provided with an expansion side damping valve in one oil passage of the piston, is provided with a check valve dosing at the time of expansion and opening at the time of compression in another oil passage, and is provided with a volume compensating oil passage of the piston rod communicated with the oil reservoir chamber in a piston side oil chamber.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: September 2, 2014
    Assignee: Showa Corporation
    Inventor: Osamu Nagai
  • Patent number: 8813923
    Abstract: Disclosed is a hydraulic damper including a valve housing (78) having a valve housing bore (88) disposed in abutting relationship with a bypass insert (68) of a base valve assembly (56) for isolating a bypass passage (70) from a reservoir (36). The valve housing (78) defines a valve housing orifice (128) extending therethrough to define an orifice plane (P). A valve (106) is rotatably disposed within the valve housing bore (88) and defines at least one valve orifice (130) extending therethrough along the plane (P). The valve (106) is rotatable between a closed position and an open position to align the valve orifice (130) and the valve housing orifice (128). A working fluid flows serially through the bypass passage (70), the valve orifice (130), and the open valve housing orifice (128).
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: August 26, 2014
    Assignee: BeijingWest Industries, Co. Ltd.
    Inventor: Saiman Lun
  • Patent number: 8794406
    Abstract: Damper which is, in particular, stiff during the inward stroke thereof and can be used, for example, as a railway damper. The piston which divides the cylinder into two chambers is provided with non-return valves which operate in both directions and are configured as characteristic. A sleeve extends from the bottom of the cylinder which is displaceable in the interior of the piston/piston rod and one end of which is connected to a reservoir and the other end of which may be connected to one of the chambers. In addition, a bottom valve is present in the cylinder. The combination of sleeve/bottom valve is fitted in such a manner that when the piston moves inwards in the cylinder, the liquid volume which has to be displaced is moved by additional rod volume which enters the cylinder via the sleeve in the reservoir. During the outward movement, the liquid is replenished from the reservoir via the bottom valve.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: August 5, 2014
    Assignee: Koni B.V.
    Inventors: Paul de Kock, Antonius Arnoldus Franciscus van Dongen, Samuel Jager
  • Patent number: 8794407
    Abstract: A shock absorber has a valve assembly having a valve that is biased away from a valve body. A controlled restriction is defined between the valve and the valve body. During stroking of the piston of the shock absorber, the valve moves toward the valve body to close the restriction. The valve assembly can be used in the piston assembly, the base valve assembly or both.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: August 5, 2014
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventors: Ronny Vanbrabant, Bert Diels, Jean-Marie Tuts, Vincent Bailly, Kristoff Six
  • Patent number: 8776961
    Abstract: A shock absorber includes: at least one cylinder apparatus including a cylinder sealingly containing operating fluid, a piston slidably fittedly inserted in the cylinder to divide an interior of the cylinder into two chambers, and a piston rod coupled to the piston and extending to an outside of the cylinder; and at least one damping force generation mechanism connected to the cylinder apparatus, and capable of generating a damping force to be applied to a flow of the operating fluid caused by a movement of the piston and adjusting the damping force from the outside. The damping force generation mechanism includes a damping valve for generating the damping force, a pilot chamber for applying a pilot pressure by the operating fluid to the damping valve, and a pump for at least supplying or discharging the operating fluid to or from the pilot chamber.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: July 15, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Shunsuke Mori, Kenichi Nakamura
  • Patent number: 8776965
    Abstract: A shock absorber that absorbs a vibration using a working fluid charged into a first chamber and a second chamber comprises a tube body, an inserted body, a tip end of which is inserted into the tube body from an end portion of the tube body, and a partition wall portion that is provided on the tip end of the inserted body to be capable of sliding within the tube body and partitions an interior of the tube body into the first chamber and the second chamber. The shock absorber comprises a connecting portion that is provided within a partition wall portion sliding region of the tube body and connects the first chamber and the second chamber when the partition wall portion passes thereby.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: July 15, 2014
    Assignee: Kayaba Industry Co., Ltd.
    Inventor: Nobuhiro Noguchi
  • Patent number: 8739948
    Abstract: A valve assembly for a shock absorber includes a valve body defining a fluid passage. A valve disc engages the valve body to close the fluid passage. A fulcrum disc engages the valve disc at a first position and a second position radially outward from the first position. The fulcrum disc is designed such that the second position is closer to the valve body. In one embodiment, the fulcrum disc is concave with respect to the valve body.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: June 3, 2014
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventor: John Patrick McGahey
  • Patent number: 8714320
    Abstract: A shock absorber has a compression valve assembly which functions during a compression stroke, a rebound valve assembly which functions during a rebound stroke and a velocity sensitive valve which is in series with one or both of the compression valve assembly and the rebound valve assembly. The compression valve assembly, the rebound valve assembly and the velocity sensitive valve can be incorporated into a piston assembly, a base valve assembly or both.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: May 6, 2014
    Assignee: Tenneco Automotive Operating Company Inc.
    Inventors: Timothy Bombrys, Darrell Breese, Gary Groves, Karl Kazmirski, Daniel Keil, Matthew Roessle, Ben Schaller, Matthew Schelosky, Jim Szymusiak
  • Publication number: 20140102842
    Abstract: A shock absorber has a compression valve assembly that provides a high damping load during a compression stroke and an extension valve assembly that provides a high damping load during an extension stroke. One or more digital valve assemblies is positioned to work in parallel with the compression valve assembly and the extension valve assembly to provide a lower damping load. The lowering of the damping load is based upon the cross sectional area of flow passages provided by the one or more digital valve assemblies.
    Type: Application
    Filed: December 19, 2013
    Publication date: April 17, 2014
    Applicant: Tenneco Automotive Operating Company Inc.
    Inventors: Matthew L. Roessle, Karl C. Kazmirski, Jeroen K. Paenhuysen, Darrell G. Breese, Daniel T. Keil, Thomas P. Mallin, Jeffrey T. Gardner
  • Patent number: 8695765
    Abstract: A shock absorber comprises a damping cylinder pressurized by a system pressure and divided by a piston into a compression chamber and a return chamber. A resilient device is disposed in the return chamber. The resilient device comprises a pressurizing member or pressurizing medium disposed in an inner volume that is delimited from the return chamber. The resilient device acts upon the damping medium volume in the return chamber such that the pressure initially during a compression stroke does not fall below a predetermined minimum pressure. As long as the pressure in the return chamber is less than the pressure created by the resilient device, the device is able to absorb energy. When the pressure in the return chamber is greater than the pressure created by the resilient device, the device becomes inflexible. The resilient device compensates for pressure reduction in the return chamber that occurs under rapid damping movements and that can cause cavitation during a compression stroke.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: April 15, 2014
    Assignee: Ohins Racing AB
    Inventors: Magnus Danek, Henrik Schiölde
  • Publication number: 20140090941
    Abstract: An inner tube as a cylinder includes an axially extending tubular portion, a large-diameter portion, and a tapered portion. The large-diameter portion is located at one end side of the tubular portion and is formed so as to have a diameter increased radially outwardly. The tapered portion is located between the large-diameter portion and the tubular portion, and is formed in such a manner that the diameter thereof increases in a flaring manner from the one end of the tubular portion to the large-diameter portion. A tubular protrusion of a rod guide is fittedly attached to the inner circumferential side of the large-diameter portion. A valve mounting portion is formed at the inner circumferential side of the tubular portion. A valve mechanism is mounted on the valve mounting portion. A seat surface is formed at the back side of the valve mounting portion.
    Type: Application
    Filed: September 23, 2013
    Publication date: April 3, 2014
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventor: Kazuaki SHIBAHARA
  • Patent number: 8672106
    Abstract: A self-regulating suspension includes a first suspension member movable relative to a second suspension member, a fluid reservoir having a volume, the volume variable in response to a relative movement between the first and second suspension members, and a fluid flow circuit having a first end in fluidic communication with the fluid reservoir and a second end in fluidic communication with an isolated suspension location, the fluid flow circuit comprising a first valve, a second valve and a third valve, wherein said first and third valves are in parallel with each other and the second valve is in series with each of the first and third valves.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: March 18, 2014
    Assignee: Fox Factory, Inc.
    Inventors: Andrew Laird, William Becker
  • Publication number: 20140069753
    Abstract: A shock absorber includes a piston disposed within a pressure tube. A valve assembly is attached to the piston. The valve assembly defines a first fluid flow through an always open fluid passage; a second fluid flow due to elastic deformation of a valve disc of the piston assembly; and a third fluid flow due to movement of the entire valve disc away from the piston. In one embodiment, the valve assembly is designed to be pre-assembled at an off-line and/or off-site location.
    Type: Application
    Filed: September 7, 2012
    Publication date: March 13, 2014
    Applicant: TENNECO AUTOMOTIVE OPERATING COMPANY INC
    Inventors: M'Hand Nait Oukhedou, Gert Mangelschots, Ward Opdekamp, Werner Bosmans