Abstract: A tripod type constant velocity universal joint comprising an outer joint member having longitudinal recesses arranged in spaced relationship on a periphery thereof, and trunnions symmetrically arranged on a tripod spider, said trunnions located in said recesses of the outer joint member by tripod rollers mounted on rolling elements, characterized in that an inner ring formed without chip removal from sheet metal is arranged between each trunnion and respective rolling elements, the inner ring, the tripod roller and the rolling elements form a roller assembly, and the inner ring comprises at least first and second radially stepped end flanges which form radially inner stops for the rolling elements and radially outer stops for the tripod roller.

Abstract: A method of thermal or thermochemical treatment of precision steel components having different wall thicknesses comprising the steps of a) hardening (8), b) low temperature cooling (9) and c) annealing (10), wherein the precision steel components are subjected to a low temperature cooling of only selected parts of the precision steel component to effect a reduction in the occurrence of primary residual austenite in the selected parts thereof.

Abstract: A constant velocity universal joint of a tripod type includes an outer joint part with three circumferentially spaced axial guide tracks for respectively receiving a tripod unit which is connected to a tripod spider and guided on a ball-headed pin for angular mobility. The a tripod unit (1) includes a form-fitting coupling directly between the tripod roller (6) and an inner ring (4), with the inner ring (4) having an annular shoulder (16) which has an end face bearing upon the tripod roller (6).

Abstract: A master cylinder for use in a hydraulically actuated clutch or brake system of a motor vehicle, includes a casing formed with a bore, and a piston unit axially displaceable within the bore. The piston unit includes a piston-shaft sleeve received in the bore and having one end formed with a bottom to define an interior, at least two retainer shells received in the interior of the sleeve free of play, and a piston rod having a spherical head swingably mounted to the retainer shells and provided to respond to a manual actuation of a pedal. The retainer shells are each formed at a pedal-proximate end of the piston-shaft sleeve with a spherical recess to define a ball socket in which the spherical head snaps in and is received in form-fitting manner.

Abstract: A tensioning device for a traction element includes a tensioner arm having a tension roller which is spring-loaded against the traction element. The tensioner arm is rotatably supported relative to a housing by means of a conical sliding bearing exhibiting parallel sliding bearing surfaces which extend concentric to the tensioner arm shaft. A helical torsion spring wound along the tensioner arm shaft and clamped between a support secured on the tensioner arm and a fixed support area exerts an axial force which is introduced into the sliding bearing as a reaction force perpendicular to the sliding bearing surfaces.

Abstract: In a sealing arrangement for bores (2) in guide rails (1), particularly for linear assemblies, each bore (2) comprises a radially widened end portion (5) for receiving a screw head (4) of a fixing screw (3) and is adapted to be sealed in a plane parallel to an upper surface (10) of the guide rail (1) by a sealing plug (6) having a disc-shaped upper part (8) and a concentric shank (9), said sealing plug (6) extending in a sealing position in the end portion (5) of the bore (2), characterized in that an annular clamping washer (7) comprising a through-slit (11) in radial direction at one circumferential point is arranged in the end portion (5) between the upper part (8) of the sealing plug (6) and the screw head (4), and the shank (9) of the sealing plug (6) is pressed into a bore (12) of the clamping washer (7) whereby, with the help of the clamping washer (7), the sealing plug (6) is fixed in a simple manner in the end portion (5) of the bore (2) which is thus sealed.

Abstract: The clearance compensation element (1) of the invention which can be installed, for example, in a valve drive of an internal combustion engine has a certain idle stroke function for undesired overpressure states of its high pressure chamber (12) during a base circle phase of the actuating cam. According to the invention, a valve means (14) such as a ball which closes the high pressure chamber (12) in the direction of a reservoir (10) is freely movable within certain limits. The ball (14), while being extremely light, closes the valve seat bore (13) with the shortest possible stroke immediately upon commencement of the opening ramp (A.sub.N) of the cam.

Abstract: A tappet (1) is to be engageable on to at least three different cam profiles with an optional zero lift. To this end the tappet (1) consists of an annular base section (2) enclosing a circular base section (3). Both base sections (2, 3) can be coupled together via radially adjustable coupling devices (10). An additional, axially movable inner piston (18) is fitted in a guide sleeve (7) of the circular base section (3). The inner piston (18) can be decoupled via further coupling means (23) so that the tappet (1) can be completely decoupled from the guide sleeve (7).

Abstract: A valve actuating mechanism which can be set to three different strokes for a gas exchange valve includes a finger lever actuated by a control cam with a single lift curve, with the finger lever being selectively connectable to a longitudinal guide in the region of its bearing member via incorporation of a piston that is movable in various positions. In a first coupling position of the piston, the bearing member is fixed to the longitudinal guide so that the finger lever executes a maximum pivot during the lift phase of the cam. In a second coupling position of the piston the finger lever is moved axially along the longitudinal guide during a complete cam lift so that the opening cross section of the gas exchange valve is smaller than in the first coupling step. In a third coupling step of the piston, the finger lever executes an idle stroke-pivoting movement on its point of contact on the gas exchange valve which remains closed.

Abstract: A valve actuating lever for a valve drive of an internal combustion engine, includes a main body formed therein with a bore and a shaft received in the bore of the main body and defining a pivot axis about which the main body pivots, to thereby control up and down motions of a gas exchange valve in response to travel of a cam mechanism. The shaft has an outer surface area formed with tangential undercuts oriented transversely to the pivot axis and formed through non-cutting shaping process.

Abstract: A device for securing an actuating lever, e.g. a finger lever, of a valve control mechanism of an internal combustion engine to a support element, with the actuating lever being formed with a concave recess receiving a spherical end of the support element for allowing the actuating lever to pivot relative to the support element includes a connecting element received in an undercut of a displaceable piston of the support element and having a thickness which is smaller than a width of the undercut to effect a free movement of the connecting element within the undercut in all pivoted positions of the actuating lever.

Abstract: A cam follower (1) comprises an annular and a circular bottom portion (2, 3). The two bottom portions (2, 3) are concentric to each other, and a low lift cam (4) is arranged opposite the circular bottom portion (3) while at least one high lift cam (5) is arranged opposite the annular bottom portion (2). The cams (4, 5) are arranged out-of-phase with each other in circumferential direction. Since, therefore, when the cam follower (1) is coupled to the high lift cam (5), the low lift cam (4) would disadvantageously actuate the cam follower (1) with its excess lift, a means is provided in the cam follower for compensating this undesired lift.

Abstract: A device for expanding rotationally symmetrical shaped parts (16), including a divided expanding mold (1), a pressure die (11) and a pressurizing means (14), wherein a mold cavity (9) of the expanding mold (1) is defined in axial directions by continuous end faces (20,21) of two spaced annular molds (17,18) and in radial direction by an inner peripheral surface of two mold halves (2,3).

Abstract: A form fitted connection between an angular disc of an axial bearing on a connecting element with the angular disc bearing against an end face of the connecting element with the angular disc comprising at least one retaining lug engaging into an associated recess in an outer peripheral surface of the connecting element.

Abstract: In a linear rolling bearing comprising a solid guide rail and a U-shaped carrier body engaging therearound, the carrier body (2) being slidably supported on the guide rail by rolling elements, each deflector comprises a housing and two deflecting shells (10) inserted therein with clearance, on which shells the webs extending into the load-bearing regions for the rolling elements are formed as centering webs (11), and each deflecting shell (10) additionally comprises a projecting, centering collar (12) which extends into a return bore (6) of the carrier body (2).

Abstract: The clearance compensation element (5) of a hydraulic tappet (1) is retained axially in cam-remote direction by an axial extension (11) of a guide element (10) which extends radially inwards from the housing (2). The cam-remote end of the axial extension (11) comprises a diameter enlargement (14) in which a Belleville-type spring washer (16) with a radially outwards acting retention force is arranged to achieve a positioning of a pressure piston (7) of the clearance compensation element (5).

Abstract: A device for the continuous variation of a relative angular position between a crankshaft and a camshaft of an internal combustion engine comprising a drive element (2) driven by the crankshaft of the internal combustion engine through a traction means, a sliding sleeve (7) which is positively locked by a first gearing (8, 9) to the drive element (2) and by a second gearing (10, 11) to a driven element (13), and an adjusting piston (6) which is fixed on the sliding sleeve (7) and guided in a housing (3) to axially delimit two pressure chambers (14, 15) which are sealed from each other by a sealing arrangement whereby a radially inward oriented sealing of the sliding sleeve (7), is achieved by providing a sealing disc (17) of continuous configuration which bears against an inner wall (19) of the sliding sleeve (7).

Abstract: A support element (1) is designed to be disconnected by a lift movement of a control cam, and includes radially movable coupling elements (12). To disconnect the support element (1), the coupling elements (12) are moved inwards by hydraulic medium, while at the same time a piston (4) communicating with the finger lever is held in cam-distant position by the hydraulic medium.

Abstract: A bearing unit for linearly moving selector shafts in a toothed-wheel gearbox with rows of beating balls in a cage rolling on the one hand on an inner surface of a sleeve permanently fitted to the gearbox housing and on the other hand on the gear change shaft. The sleeve has a flange at one end by which the sleeve can be secured to a gearbox housing in such a way that it extends freely into the gearbox housing over its entire length.

Abstract: A finger lever for a valve drive of an internal combustion engine which finger lever is contacted in a central region by a control cam and cooperates at one end with a gas exchange valve in the opening direction while being pivoted at another end by a bore on a shaft for pivoting relative to a cylinder head of an internal combustion engine by means projecting radially beyond a peripheral surface of a shaft in the region of a surrounding cam follower.