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| Number | Title | Issue Date |
| 7992387 | Arrangement for simultaneous actuation of compensation valves A master cylinder having a housing with a bore wherein front and rear pistons are located by return springs to define front and rear chambers. The front and rear chambers are respectively connected by an axial port and a radial port in the housing to a reservoir. Co... | 08/09/2011 |
| 7930887 | Hydraulic master cylinder and vehicle provided with the same A rear brake control hydraulic master cylinder that dispenses with adjustment work to decrease a clearance between a piston and a push member. A master cylinder 31 includes first and second oil chambers. The piston includes a piston oil passage portion connec... | 04/26/2011 |
| 7555902 | Tandem master cylinder with central valves A tandem master cylinder (1) with central valves has ball-shaped valve members (25, 40) with leaf springs (26, 41) serving as valve springs. The ball-shaped valve members (25, 40) can be manufactured of a plastic material, coated with an ... | 07/07/2009 |
| 7287457 | Structure for retaining a piston assembly in position relative to a cylinder A fluid actuator and retainer assembly, such as a master cylinder assembly for a vehicular braking system, includes a housing having a groove, a cylinder provided within the housing, and a piston assembly. The piston assembly includes a piston disposed within the cy... | 10/30/2007 |
| 7261382 | Reservoir tank for vehicle brake system A reservoir tank has an inlet/outlet port communicating with a master cylinder, and a hydraulic fluid supply port provided directly opposite the inlet/outlet port. A tubular portion is provided on the inner surface of the tank. The tubular portion has an internal pa... | 08/28/2007 |
| 7222486 | Diaphragm assembly A diaphragm assembly for use with a hydraulic apparatus. The diaphragm assembly includes a cap formed of a rigid material and a diaphragm formed of an elastomeric material. The diaphragm is generally tubular and includes an upper annular collar portion defining an o... | 05/29/2007 |
| 7219595 | Master cylinder housing A master cylinder housing including an outer shell having an open end and a closed end, a polymeric inner lining received within the outer shell, and a mounting flange extending from the open end of the outer shell. ... | 05/22/2007 |
| 7202426 | Master cylinder position switch A clutch assembly having a master cylinder that includes non-contacting position switches is disclosed. The master cylinder controls a slave cylinder that shifts the release bearing of the clutch system. A cruise control interrupt switch and an ignition system inter... | 04/10/2007 |
| 7197875 | Hydraulic cylinder with coaxial, in-line reservoir A compact hydraulic cylinder may include a pressure chamber and a reservoir in coaxial, in-line arrangement relative to one another. The pressure chamber and reservoir are separated from one another in use by a piston and hydraulic seal. The piston may be withdrawn ... | 04/03/2007 |
| 7194860 | Hydraulic cylinder, in particular master cylinder for a hydraulic clutch actuation system for motor vehicles A hydraulic cylinder, in particular a master cylinder for a hydraulic clutch actuation system for motor vehicles, has a housing having a cylinder wall, in which a piston is slidably received to seal off the pressure chamber, whereas the pressure chamber in a rest po... | 03/27/2007 |
| 7168536 | Brake master cylinder comprising plunger pistons and radial grooves inserted into the housing in order to receive sealing joints The present invention relates to a tandem master cylinder including two plunger pistons and its object is to design the cylinder as simple as possible and to render its assembly as economical as possible. This object is achieved by inserting circumferential annular ... | 01/30/2007 |
| 7121094 | Center valve for master cylinder A center valve for a master cylinder includes a valve body and a valve seat fitted in a valve casing. The valve seat has an elastic tube fitted on a core member. The elastic tube has a front end portion adapted to be pressed against the rear end face of the valve bo... | 10/17/2006 |
| 7104059 | Master cylinder A master cylinder includes a primary cup received in a groove formed in the inner wall of the cylinder body. Projections are formed on a radially inner portion of the cup so as to protrude forwardly from the front end of the radially inner portion. The projections a... | 09/12/2006 |
| 7104613 | Pump with reciprocating high pressure seal and valve for vehicle braking systems A pump assembly with a combination reciprocating high-pressure seal and fluid inlet check valve for use within brake systems. The pump assembly comprises a housing having a bore formed therethrough and a piston disposed within the bore for reciprocal movement therei... | 09/12/2006 |
| 7086229 | Piston for a hydraulic brake system and master cylinder equipped therewith The invention relates to a piston having a valve arrangement for a vehicle hydraulic brake system comprising a piston channel penetrating the piston, a valve seat formed around an opening of the piston channel, and a valve element, which is displaceable relative to ... | 08/08/2006 |
| 7047868 | Piston and cylinder assembly with push rod retention A piston and cylinder assembly in which the rear end of the piston defines an arcuate concavity opening in the rear face of the piston, a retainer having an arcuate configuration matching the arcuate configuration of the piston concavity is positioned in the concavi... | 05/23/2006 |
| 7044566 | Caging arrangement for a spring A caging arrangement for setting a spring height and correspondingly chamber size in a master cylinder. A cylindrical member has a convoluted surface that is placed in a bore of a piston and a ball is pressed into the cylindrical member to radially expand the convol... | 05/16/2006 |
| 7024854 | Master cylinder with increased safety and piston for such a master cylinder A master cylinder with increased safety having a piston produced by molding a plastic or aluminum alloy. The piston slides in a bore blocked off by an end wall. A valve for the master cylinder bears at rest against a pin that is fixedly mounted in the body of the ma... | 04/11/2006 |
| 6978614 | Master cylinder comprising a valve with reduced pedal free travel This invention relates to a master cylinder (10), inside a bore (14) of which two axial primary and secondary pistons (16, 18), are slidingly fitted, and in which at least one sealing means (48, 50) is disposed in contact with each piston... | 12/27/2005 |
| 6951104 | Hydraulic piston-and-cylinder arrangement A hydraulic piston-and-cylinder arrangement has a piston to which a signal element is assigned and which is accepted movably in a longitudinal direction in a cylinder housing, at which a position sensor is secured, by means of which an axial position of the signal e... | 10/04/2005 |
| 6935110 | Tandem master cylinders for hydraulic systems A tandem master cylinder in which fluid under pressure is supplied to a primary outlet port from a primary pressure space in a bore between a positively actuated main piston and a floating or secondary piston, and to a secondary outlet port from a secondary pressure... | 08/30/2005 |
| 6935113 | Master cylinder piston and device for mounting a check valve therein A master cylinder piston for use in a motor vehicle having a flap (22) that is biased towards a position to shut off a pressure-fluid passage (24) by a return spring (28) resting on a cage (30). A flange (38) on a cage (30)f... | 08/30/2005 |
| 6928815 | Master cylinder having a seal retainer The present invention is directed to a master cylinder provided with an annular seal member (S1) having an annular groove of U-shaped cross section formed on its one end face, and a substantially annular seal retainer (30) for restricting at least axia... | 08/16/2005 |
| 6871496 | Adjustable dual center port compensation for master cylinder A vehicle braking system master cylinder that can handle pressure pulses within the brake fluid of a vehicle braking system without the destruction of components internal to a master cylinder. A vehicle braking system master cylinder that allows for component subass... | 03/29/2005 |
| 6862884 | Master cylinder A master cylinder (10) for a vehicle hydraulic brake system has a housing (12), which has a bore (14), which extends along a longitudinal axis (A) and is sealingly closed at one end by an end wall forming part of the housing (12) of the m... | 03/08/2005 |
| 6848257 | Master cylinder comprising a fluid and replenishing seal A master cylinder (10) having an axial body (12) with a bore (14) for receving a piston (16, 18), a front seal (26, 28) and a rear seal (30, 32) to delimit a rear supply chamber (34, 38) from a front pressure chamber ... | 02/01/2005 |
| 6837048 | Tandem master cylinder A master cylinder having a body with a bore therein delimited by a piston into a work chamber and a supply chamber. The work chamber (16) is connected to wheel brakes, while the supply chamber is connected to a fluid supply, through a supply duct. The piston ... | 01/04/2005 |
| 6832479 | Resin piston for master cylinder in brake system, master cylinder, die for molding resin piston for master cylinder, and manufacturing method of resin piston for master cylinder An upper die and a lower die are combined. A core for molding a concavity and another core are combined with the combined upper die and the lower die at respective prescribed positions. A core for through-hole molding is constructed by the junction of cores that are... | 12/21/2004 |
| 6817179 | Poppet for center port compensation valve A master cylinder having first and second chambers respectively connected to a reservoir and to front and rear wheel brakes in a brake system. First and second center port compensation valves each have a head that is connected to a stem that joins a first retainer w... | 11/16/2004 |
| 6775979 | Actuation device for an electrohydraulic braking system The present invention relates to an actuation device for an electrohydraulic brake system of the ‘brake-by-wire’ type which is configured as a tandem master cylinder with a first and a second piston that are respectively biased by a resetting spring in oppositio... | 08/17/2004 |
| 6775980 | Hydraulic master cylinder with concealed dead travel Hydraulic master cylinder for a motor vehicle braking circuit, comprising means for concealing the dead travel of the primary (16) and secondary (44) pistons, these concealing means consisting of additional valve shutters (80) borne by the valve... | 08/17/2004 |
| 6775978 | Caging arrangement for a center port compensation valve A brake system having a master cylinder with a center port compensation valve wherein a head on a stem for caging a return spring moves within a poppet assembly as a direct function of the compression of the return spring during the development of pressurized fluid ... | 08/17/2004 |
| 6769254 | Hydraulic operating systems for clutches and the like The piston of a master cylinder in the power train of a motor vehicle is made, at least in part, of a thermosetting plastic material and cooperates with one or more annular seals to ensure that a source of hydraulic fluid is communicatively connected with the chambe... | 08/03/2004 |
| 6494040 | Method for making a master cylinder and master cylinder obtained by said method In a process for manufacturing a master cylinder (23) wherein a piston (9) that carries a valve (37) is assembled within a cylinder to define a chamber (41). The piston (9) moving in the chamber (9) in such a way that initial forward travel in cylinder de... | 12/17/2002 |
| 6434931 | Hydraulic brake master cylinder with controlled center port valve gap and method of assembly A hydraulic brake master cylinder assembly includes a central or center port compensation valve mounted in respective brake actuator pistons and having a variable length stem which may be adjusted to predetermine the amount of valve travel between open an... | 08/20/2002 |
| 6425245 | Master cylinder with valves having reduced clutch pedal free play A master cylinder having a body (10) with a bore (12) therein in which slides at least a primary piston (20). The primary piston (20) has a compensation passage (58), which in a position of rest, places a pressure chamber (24) in communication with a rese... | 07/30/2002 |
| 6386648 | Master cylinder and brake booster for a brake system A brake system for (10) a vehicle having a brake booster (14a) with an output put rod (152a) for providing a primary piston (310) in a master cylinder (12a) with an input force to pressurize fluid which is supplied to wheel brakes (10a) of a vehicle to ef... | 05/14/2002 |
| 6343472 | Master cylinder with variable refill passage A master cylinder having a body (1) pierced with a bore (100) that is partially closed by a guide ring (11). A piston (3) mounted to slide in the guide ring (11) and bore (100) to define a pressure chamber (4) within the bore (100). An inlet (2) having a ... | 02/05/2002 |
| 6203022 | Annular sealing element An annular sealing element (16) for sealing an annular gap between the inner surface of a cylindrical wall and a cylindrical piston which can be displaced axially relative to said wall and is arranged concentrically therewith, has two separate annular and... | 03/20/2001 |
| 6065279 | Master cylinder In a master cylinder for drawing brake fluid from a reservoir through a pressure generating chamber in the master cylinder during fluid pressure control to supply brake pressure to a wheel cylinder, a check valve is provided for securing sufficient suctio... | 05/23/2000 |
