Patents by Inventor Ernst-Dieter Schaefer
Ernst-Dieter Schaefer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20080284239Abstract: The invention relates to a brake system for a vehicle having at least one brake circuit which includes at least one wheel brake, one inlet valve, one outlet valve, and one return device. The return device has at least one first pump device and one second pump device, having respective inlet valves and outlet valves. The pump devices have a delivery cycle offset from each other. An additional valve is located in every supply line of every pump device for preventing negative pressure produced in an intake phase of one of the pump devices from being applied to an inlet valve of another pump device.Type: ApplicationFiled: October 27, 2006Publication date: November 20, 2008Inventors: Ernst-Dieter Schaefer, Thomas Butz, Guy-Edward Michalski, Marcel Munoz Greschuchna, Christian Doberschuetz, Ralf Breit
-
Patent number: 7278835Abstract: A piston pump for brake systems employs a pulsation-smoothing device that functions especially well in the region of the outlet valve. As a result, substantially less noise occurs, and the durability of the piston pump is substantially better. The piston pump is used essentially in traction-controlled motor vehicle brake systems.Type: GrantFiled: March 13, 2002Date of Patent: October 9, 2007Assignee: Robert Bosch GmbHInventors: Edgar Schmitt, Norbert Alaze, Ernst-Dieter Schaefer, Marcus Egle, Jochen Braun, Ursula Eckstein, Peter Zimmermann, Christian Debusmann, Manfred Dreyer
-
Publication number: 20040166004Abstract: In piston pumps for brake systems used until now, there were often noise problems, from pressure pulsations.Type: ApplicationFiled: April 14, 2004Publication date: August 26, 2004Inventors: Edgar Schmitt, Norbert Alaze, Ernst-Dieter Schaefer, Marcus Egle, Jochen Braun, Ursula Eckstein, Peter Zimmermann, Christian Debusmann, Manfred Dreyer
-
Patent number: 6758243Abstract: A pressure accumulator has a housing having at least one pressure medium opening, a diaphragm chamber arranged inside the housing and having a side wall which is at least partially deformable, and a pressure medium chamber arranged outside of the diaphragm chamber, the pressure medium chamber at least partially being limited by a partially permeable material which allows an exit of gas from the pressure medium chamber but prevents an exit of a pressure medium from the pressure medium chamber.Type: GrantFiled: November 29, 2001Date of Patent: July 6, 2004Assignee: Robert Bosch GmbHInventor: Ernst-Dieter Schaefer
-
Publication number: 20040045431Abstract: The invention relates to a roller bearing, in particular a needle bearing (38). The invention proposes embodying a bearing ring (42) of the needle bearing (38) with a lateral extension (46) with which the needle bearing (38) can be pressed into a bearing seat (48). This has the advantage that a compression of the bearing ring (42) by the bearing seat (48) takes place outside the region of the needles (40) of the needle bearing (38) and consequently, the compression of the bearing seat (48) does not influence a bearing play of the needle bearing (38). The needle bearing (38) is particularly provided for supporting a shaft (24) of a piston pump (16) of a pump unit (10), which shaft supports a cam (26).Type: ApplicationFiled: August 29, 2003Publication date: March 11, 2004Inventors: Edgar Schmitt, Heinz Siegel, Ernst-Dieter Schaefer, Erwin Sinnl
-
Publication number: 20030170133Abstract: The invention relates to a piston pump (10) for a hydraulic vehicle brake system that has traction control. The invention proposes embodying the piston pump (10) with a piston ring (24), for instance a PTFE, which ring serves as both a sealing and a guide ring. The invention lessens the effort and expense of assembly as well as the production costs for the piston pump (10). To achieve reliable sealing, the invention proposes embodying the piston ring (24) with an internal cone on its side toward a pump chamber (18), so that during a pumping stroke, the piston ring (24) is subjected to pressure from the pump chamber (18) and is pressed into sealing contact against a pump bore (12).Type: ApplicationFiled: May 12, 2003Publication date: September 11, 2003Inventor: Ernst-Dieter Schaefer
-
Patent number: 6554111Abstract: A method of employing a hydraulic unit of a brake system containing brake lines extending between a master cylinder and wheel brakes and valves which are actuatable by exertion of magnetic force and which have removable electrical coils and when unactuated assume their blocking position, including the steps of removing coils from the valves; connecting the hydraulic unit, toward the master cylinder or the wheel brakes, to an air source of adequately high pressure; switching the valves to their open position by the exertion of magnetic force of a permanent magnet; positively displacing the pressure medium contained in the hydraulic unit from the air source by air and caught.Type: GrantFiled: August 17, 2001Date of Patent: April 29, 2003Assignee: Robert Bosch GmbHInventors: Ernst-Dieter Schaefer, Hans-Heinz Kauschke, Timo Zundel
-
Publication number: 20020134630Abstract: A method of employing a hydraulic unit of a brake system containing brake lines extending between a master cylinder and wheel brakes and valves which are actuatable by exertion of magnetic force and which have removable electrical coils and when unactuated assume their blocking position, including the steps ofType: ApplicationFiled: August 17, 2001Publication date: September 26, 2002Applicant: Robert Bosch GmbHInventors: Ernst-Dieter Schaefer, Hans-Heinz Kauschke, Timo Zundel
-
Publication number: 20020096223Abstract: A pressure accumulator has a housing having at least one pressure medium opening, a diaphragm chamber arranged inside the housing and having a side wall which is at least partially deformable, and a pressure medium chamber arranged outside of the diaphragm chamber, the pressure medium chamber at least partially being limited by a partially permeable material which allows an exit of gas from the pressure medium chamber but prevents an exit of a pressure medium from the pressure medium chamber.Type: ApplicationFiled: November 29, 2001Publication date: July 25, 2002Inventor: Ernst-Dieter Schaefer
-
Patent number: 6389955Abstract: A pump assembly having a piston pump, which is driven by an eccentric element. To prevent leakage brake fluid from reaching an eccentric element chamber, a groove surrounds the pump piston in the pump housing and a seal and a porous metal sintered ring is inserted into the groove. A drain which extends obliquely downwardly from the groove drains leakage fluid from the sintered ring.Type: GrantFiled: November 3, 2000Date of Patent: May 21, 2002Assignee: Robert Bosch GmbHInventor: Ernst-Dieter Schaefer
-
Patent number: 6272970Abstract: A motor-and-pump unit having an electric motor in combination with a housing of the pump. The pump has at least one displaceable pump piston. To that end, on the side toward the pump housing and originating at one end wall, the electric motor has a bearing neck, which is tubular and into which the pump housing protrudes. This bearing neck fixes an outer ball bearing race of a ball bearing for a shaft of the electric motor. Protruding from the ball bearing is a shaft end that carries an eccentric element for moving the at least one pump piston. The eccentric element is disposed at an axial spacing from an inner ball bearing race that surrounds the shaft in stationary fashion. The eccentric element is brought directly up to the inner ball bearing race, and the inner ball bearing race and the eccentric element are embodied as a one-piece, multifunctional component.Type: GrantFiled: October 21, 1999Date of Patent: August 14, 2001Assignee: Robert Bosch GmbHInventor: Ernst-Dieter Schaefer
-
Patent number: 6193481Abstract: A piston pump, which is provided as a return feed pump for a slip-regulated motor vehicle brake system. In order to simplify the manufacture, a sleeve in the form of a tubular piece is clamped between a fastening element which is inserted into the cylinder bore using a self-clinching technique, and the cylinder bore, and is thus sealed and fixed in place. In addition to the simple manufacture of the sleeve out of reasonably priced tubular material, the piston pump has the advantage of a sealing of the sleeve in the cylinder bore without a separate sealing element such as a sealing ring.Type: GrantFiled: September 13, 1999Date of Patent: February 27, 2001Assignee: Robert Bosch GmbHInventors: Norbert Alaze, Friedrich Megerle, Ernst-Dieter Schaefer, Wolfgang Schuller, Guenther Schnalzger, Ralf Zitzelsberger, Gerd Baur, Michael Hellebrandt
-
Patent number: 6093003Abstract: The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore surrounding the piston, an outer lip forms a diaphragm, which rests against a wall of the pump bore and is acted upon on its outside with ambient pressure through a venting bore. The cuff is part of a fluid storage element, which makes an additional fluid volume available to the piston pump. The diaphragm acted upon by ambient pressure creates a pumping effect, if a fluid pressure in the fluid storage element drops below ambient pressure in an intake stroke of the piston.Type: GrantFiled: March 23, 1998Date of Patent: July 25, 2000Assignee: Robert Bosch GmbHInventors: Manfred Hauser, Ernst-Dieter Schaefer, Wolfgang Schuller, Erwin Sinnl, Peter Lang
-
Patent number: 5988768Abstract: A brake system that includes a power-actuated service brake and an auxiliary brake that is actuated by muscle power. To achieve a desired characteristic curve of the pedal when the service brake is actuated, a path simulator is provided in a master cylinder. This path simulator has compression springs disposed in a pressure chamber. The pressure chamber is defined by a floating piston with a seat valve, which controls a pressure fluid-carrying connection of the pressure chamber to a pressure fluid reservoir of the master cylinder. The function of the seat valve is dependent on the stroke of a rod piston, which can displace pressure fluid from a first pressure chamber when the auxiliary brake is actuated. The path simulator is active if pressure fluid is not displaced from the first pressure chamber during the actuation of the service brake and therefore the seat valve assumes its open position.Type: GrantFiled: June 15, 1998Date of Patent: November 23, 1999Assignee: Robert Bosch GmbHInventors: Ernst-Dieter Schaefer, Eberhardt Schunck, Andreas Kaessmann
-
Patent number: 5897302Abstract: The invention is based on a reciprocating piston pump having two radial pistons disposed symmetrically to one another, which are drivable to a reciprocating motion by an eccentric disposed between them and are held in contact with the eccentric by a hoop spring that engages the pistons. For ease of installation, the invention proposes embodying the hoop spring as a bent wire part, with two open, hooklike eyelets on their ends, which ends are inserted into annular grooves of the pistons and enter into a snap connection with them in order to hold the pistons tightly against the eccentric.Type: GrantFiled: October 2, 1996Date of Patent: April 27, 1999Assignee: Robert Bosch GmbHInventors: Heinz Siegel, Ernst-Dieter Schaefer, Guenter Krenz, Dirk Merbold
-
Patent number: 5842405Abstract: The present invention relates to an eccentric arrangement for a reciprocating piston pump, having a drive shaft drivable by a drive device, an eccentric part of a rubber-elastically deformable material is disposed on the drive shaft in a manner fixed against relative rotation. A bearing ring is provided on an outer circumferential surface of the eccentric part, by which ring a reciprocating piston is displaceable driven substantially perpendicular to the drive shaft. To avoid stroke losses, first and second support faces are provided on the drive shaft which the eccentric part disposed between them in such a way that the eccentric part rests with its axial ends on the first and second support faces.Type: GrantFiled: June 25, 1997Date of Patent: December 1, 1998Assignee: Robert Bosch GmbHInventors: Ernst-Dieter Schaefer, Guenter Krenz
-
Patent number: 5803555Abstract: The invention relates to a damper for a slip-controlled brake system of a vehicle. An elastic damper body is disposed in a damper chamber cut as a bore into a hydraulic housing block of the vehicle brake system. The elastic damper body includes an encompassing sealing edge that partitions the damper chamber into a chamber that can be acted upon by fluid and a residual volume. During pressurization, this damper body is elastically compressed or expanded. The advantages of the damper of the invention are a simple design, good damping properties and its ability to avoid the formation of cracks in its damper body.Type: GrantFiled: November 27, 1996Date of Patent: September 8, 1998Assignee: Robert Bosch GmbHInventor: Ernst-Dieter Schaefer
-
Patent number: 5718488Abstract: An oscillation damper that has a cup-shaped elastomer diaphragm body, with a bottom diaphragm. The diaphragm body is received tightly on an opening side in a bore of a housing, and fits around a protrusion of a closure body that closes the bore. Between the closure body and the diaphragm, a support body having an end face that is concave toward the diaphragm is received in the diaphragm body. A void formed between the diaphragm and the support body communicates with the atmosphere, through a conduit embodied on the support body and through an opening in the closure body. The oscillation damper can be used in hydraulic slip-controlled motor vehicle brake systems.Type: GrantFiled: October 25, 1996Date of Patent: February 17, 1998Assignee: Robert Bosch GmbHInventors: Steffen Schneider, Ernst-Dieter Schaefer, Guenter Krenz
-
Patent number: 5190362Abstract: A pressure limiting valve has a valve closing member (ball), which is subjected to a hydraulic opening force and is indirectly subjected to a closing force generated by a compression spring which avoids hysteresis that impairs the switching behavior of the pressure limiting valve. A tappet, which passes through a sealing ring and is exposed to a control pressure, is also capable of acting in a closing manner upon the pressure limiting valve. When there is no operative control pressure, the tappet is pushed back by the opening of the pressure limiting valve and is retained in this position by frictional forces brought about by a sealing ring. The switching plays of the pressure limiting valve are free of frictional forces. The pressure limiting valve is suitable for use in hydraulic motor vehicle brake systems.Type: GrantFiled: July 8, 1991Date of Patent: March 2, 1993Assignee: Robert Bosch GmbHInventors: Ernst-Dieter Schaefer, Klaus Mueller
-
Patent number: 5172956Abstract: A hydraulic system having a pressure generator which is protected against destructive overload. The hydraulic system has a pulsating feeding pressure generator, such as a piston pump, which feeds pressure fluid at high pressure into a damper chamber of a housing. A throttle body having a throttle bore is disposed on the outlet side of the damper chamber. For producing the protective effect, the damper chamber is preceded by a rupture disk communicating with the outlet. The throttle body suitably has a thin-walled portion, embodied as a rupture disk, in which the throttle bore is located. The embodiment described is advantageously usable in hydraulic systems in which pressure fluids are pulsatingly fed at high pressures.Type: GrantFiled: July 12, 1991Date of Patent: December 22, 1992Assignee: Robert Bosch GmbHInventors: Michael Klose, Ernst-Dieter Schaefer, Frank Schumann, Gerhard Wetzel, Klaus Mueller