Patents by Inventor Walter Parzefall
Walter Parzefall 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).
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Patent number: 6502682Abstract: The abstract relates to a hydraulic clutch release system, particularly for motor vehicles. The system 1 has a master cylinder and a slave cylinder, and the slave cylinder has a piston 7 which is annular in form and works inside an annular cylinder 2. The leading end of the cylinder is fitted with a seal 9 which is mounted on a one-piece seal carrier 10a through an undercut part of the carrier in which the seal fits without leaving any empty space.Type: GrantFiled: July 16, 2001Date of Patent: January 7, 2003Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KGInventors: Hartmut Koschmieder, Walter Parzefall, Ludwig Winkelmann, Harald Peschke
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Patent number: 6470909Abstract: A hydraulic system for a motor vehicle has at least one pressure restricting valve with a housing that has two or more connections. At least one conduit cross-section in the housing can be closed by means of a closing body that is movable axially against the action of an energy accumulator. At least a part of the axial travel of the closing body is damped by means of a damping device.Type: GrantFiled: December 8, 2000Date of Patent: October 29, 2002Assignee: LuK Lamellen und Kupplungsbau Beteiligungs KGInventors: Jürgen Osterlänger, Gerhard Prosch, Walter Parzefall, Jean-Francois Heller, Manfred Homm, Alexandre Fidline, Eugen Kremer
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Publication number: 20010047918Abstract: The abstract relates to a hydraulic clutch release system, particularly for motor vehicles. The system 1 has a master cylinder and a slave cylinder, and the slave cylinder has a piston 7 which is annular in form and works inside an annular cylinder 2. The leading end of the cylinder is fitted with a seal 9 which is mounted on a one-piece seal carrier 10a through an undercut part of the carrier in which the seal fits without leaving any empty space.Type: ApplicationFiled: July 16, 2001Publication date: December 6, 2001Applicant: LuK Lamellen und Kupplungsbau GmbHInventors: Hartmut Koschmieder, Walter Parzefall, Ludwig Winkelmann, Harald Peschke
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Publication number: 20010020415Abstract: A hydraulic system for a motor vehicle has at least one pressure restricting valve with a housing that has two or more connections. At least one conduit cross-section in the housing can be closed by means of a closing body that is movable axially against the action of an energy accumulator. At least a part of the axial travel of the closing body is damped by means of a damping device.Type: ApplicationFiled: December 8, 2000Publication date: September 13, 2001Applicant: LuK Lamellen und kupplungsbau GmbHInventors: Jurgen Osterlanger, Gerhard Prosch, Walter Parzefall, Jean-Francois Heller, Manfred Homm, Alexandre Fidline, Eugen Kremer
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Patent number: 6273231Abstract: A hydraulic clutch release system, particularly for motor vehicles has a master cylinder and a slave cylinder, and the slave cylinder has a piston 7 which is annular in form and works inside an annular cylinder 2. The leading end of the cylinder is fitted with a seal 9 which is mounted on a one-piece seal carrier 10a through an undercut part of the carrier in which the seal fits without leaving any empty space.Type: GrantFiled: October 12, 1999Date of Patent: August 14, 2001Assignee: LuK Lamellen und Kupplungsbau GmbHInventors: Hartmut Koschmieder, Walter Parzefall, Ludwig Winkelmann, Harald Peschke
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Patent number: 5547058Abstract: A hydraulically actuatable device (1) for disengaging a gearshift clutch of an automotive vehicle, having an annular piston (4) arranged for sliding displacement with its inner peripheral surface (9) on a guide sleeve (6) and its outer peripheral surface (13) in a clutch output cylinder (2), a release bearing (5) positionally fixed by a disc spring (20) being lodged in an end of the annular piston (4) away from a pressure chamber (8), characterized in that, there is arranged on end of the annular piston (4) a fixing ring (12) comprising a cylindrical portion (14) which engages around a part of the outer peripheral surface (13) of the annular piston (4) to which it is fixed by positive engagement, and a radially inwards oriented arm (17) of an inner ring (16) of the release bearing (5) engages into a portion (15,45) of the fixing ring (12) having a U- or L-shaped cross-section and extending beyond end of the annular piston (4), arm (17) of the inner ring (16) being urged by the disc spring (20) supported on aType: GrantFiled: March 17, 1995Date of Patent: August 20, 1996Assignee: INA Walzlager Schaeffler KGInventors: Walter Parzefall, Herbert Folk
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Patent number: 5076717Abstract: A sliding sleeve made of polymeric material for clutch release bearings comprising a hollow cylindrical hub element (1) provided with a radially outwardly directed ring collar (3) on its outer surface, a ring-shaped metal flange (4) abutting against the surface of the collar (3) facing the clutch forming a stop surface 5 for a radially adjustable raceway of a roller bearing, characterized in that the metal flange (4) has at least one axially directed collar (6,9) extending over at least part of its inner and/or outer circumference surface, the collar resting on the outer surface (2,10) of the hub element (1) and/or the ring collar (3) under radial prestress.Type: GrantFiled: March 22, 1990Date of Patent: December 31, 1991Assignee: Ina Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4969755Abstract: An inner bearing ring of a clutch release bearing for an automotive vehicle clutch equipped with diaphragm springs, whereby the clutch release bearing comprises a rolling bearing with two concentric bearing rings arranged on a sliding sleeve between which rings rolling elements roll, and whereby a washer is fixed on the side face of the rotating inner ring which faces the clutch and which during operation acts with the spring finger ends of the diaphragm spring, characterized in that the inner ring (6) is formed from a metal raceway element (9) and an annular element, whereby the annular element forms the circular washer (10) which with its side not facing the clutch is supported on the raceway element (9) and which has an axial extension (12) which is inserted clearance-free into the bore of the metal raceway element (9) and which on its end (13) opposite the washer (10) engages behind the end of the metal raceway element (9) so that the raceway element (9) is retained in a form-locking way on the annular elType: GrantFiled: May 3, 1990Date of Patent: November 13, 1990Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4911277Abstract: A release bearing assembly for a push type motor vehicle clutch, one side of which is acted upon by a clutch lever via a housing of the release bearing and against the other side of which clutch disk springs are arranged whereby the housing is axially displaceable along a guiding tube characterized in that the housing is provided with an axially displaceable sleeve, a pressure spring acts between a contact surface of the housing and a collar of the sliding sleeve and in the engaged state of the clutch, the sliding sleeve abuts against a stop face which causes the pressure spring to press the release bearing via the housing concentrically against the clutch disk springs.Type: GrantFiled: April 14, 1989Date of Patent: March 27, 1990Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4863005Abstract: A pull-type friction clutch with a release bearing for a motor vehicle in which at least two locking elements spaced at the periphery of an axially displaceable thrust ring to allow it to engage axially with a rotating inner ring of the release bearing in a manner that these two elements get more firmly locked when pulled away from one another characterized in that the locking elements (15, 16, 17) have an angular cross-section and are mounted on the thrust ring (9) about an axle (18, 19, 20) so as to be able to swing into a locking position, whereby the edges of the locking elements (15, 16, 17) facing the inner ring (22) are shaped as hooks (21) which engage with a collar (24) formed on the inner ring (22) and the edges of the locking elements (15, 16, 17) away from the inner ring (22) have the shape of angle segments (31) whose surfaces (32) bear against the side of the pressure ring (9) facing away from the hooks (21 ).Type: GrantFiled: February 5, 1988Date of Patent: September 5, 1989Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4850467Abstract: A clutch release sleeve for motor vehicles comprising a housing having at two opposite points of its circumference radially extending lugs against which two parallel arms of a clutch fork abut to embrace the housing within reach of two flat faces, characterized in that the lugs (2) have a radial extension (a) of at least 10% of the housing diameter (D) and a tangential extension (b) of at least 25% of the housing diameter (D) and are offset laterally in opposite directions in relation to a straight line running through the sleeve axis (9), on one hand, and through the points of contact (10) of the clutch fork (4) and the lugs (2) on the other hand so that they project over the straight line further in one direction than in the other direction wherein the flat faces are perpendicular to the straight line.Type: GrantFiled: January 4, 1989Date of Patent: July 25, 1989Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4832166Abstract: A friction clutch for a motor vehicle with a release bearing which is engaged by a clutch lever with an axially displaceable thrust ring connected in an axially locked manner with regard to pulling by locking elements spaced about its periphery with a rotatable inner ring of the release bearing, and with unlocking lugs corresponding with the locking elements and disengage the locking elements from the inner ring, characterized in that an unlocking slide (15) is guided for radial displacement between an idle position and an unlocking position on the clutch lever (3) and corresponds with the unlocking lugs (22) and the unlocking lugs (22) disengage the locking elements (12) from the inner ring (7) by the unlocking slide (15) which is shifted into the unlocking position.Type: GrantFiled: February 5, 1988Date of Patent: May 23, 1989Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4773516Abstract: A support element for a clutch lever for motor vehicles wherein the clutch lever is supported at a pivotal point on one hand and is engaged by an actuator on the other hand and acts on a clutch release bearing longitudinally moveable on a guide tube which extends coaxially to the axis of a friction clutch, characterized in that a dampening element (16,21,24,26,29) made of polymeric material is provided at the pivotal point (6) which is designed and cooperates with the clutch lever (5) in such a manner that vibrations of the clutch lever (5) about a longitudinal axis extending through pivotal point (6) on the one hand and the point of contact (15) of the an actuator (12) on the other hand are prevented or absorbed.Type: GrantFiled: March 11, 1987Date of Patent: September 27, 1988Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4648500Abstract: A clutch release means for motor vehicles consisting of a housing holding a rolling bearing, said housing being axially moveable on a guide concentric with the clutch axis under the action of a pivoted clutch fork characterized in that the housing (1) has curvatures (7) at the contact points with clutch fork (3) which are turned toward the latter and whose vertices lie in a plane passing through clutch axis (8) and the contact surfaces (9) of clutch fork (3) have a flat form.Type: GrantFiled: March 8, 1985Date of Patent: March 10, 1987Assignee: INA Walzlager Schaeffler KGInventor: Walter Parzefall
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Patent number: 4544212Abstract: A rolling bearing for longitudinal movements of limited slide path for guiding a rectangular cross-section bar comprising an outer element, an inner element and rows of balls rolling between said elements, the outer element on whose bore wall the balls roll being insertable into a cylindrical housing bore and the inner element, being provided with straight, axially extending inner ball races and at least partially surrounding the rectangular cross-section bar, bears against the bar by the back of its ball races, characterized in that the outer element is formed as a cylindrical tube section and the inner element is connected to the bar to form a structural unit so that it is retained on the bar in its position required for operation and a cage retaining the balls at the inner element is provided which cage forms a structural unit with the inner element.Type: GrantFiled: January 14, 1985Date of Patent: October 1, 1985Assignee: INA Walzlager Schaeffler KGInventors: Walter Parzefall, Wolfgang Pflugner, Wolfgang Steinberger