Abstract: A method of producing a structural element comprising a metallic sleeve provided with a continuous axial slot at a circumferential area and an outer surface completely surrounded by a jacket comprising making a metallic sleeve (3,18) with an inner diameter corresponding to a maximum of the inner diameter of the finished structural element (1,16) surrounding the sleeve with the jacket (4,17) in an apparatus (5) provided with a core (8) for receiving the metallic sleeve (3,18) and elastically widening the metallic sleeve (3,18) when placed on the core (8) whereby the slot (2,19) of the metallic sleeve (3,18) is at least partially filled with the material of the jacket (4,17) during formation of the jacket (4,17) so that the boundary surfaces of the slot (2,19) of the metallic sleeve (3,18) is at least partially covered, and the structural element produced thereby.

Abstract: A rolling bearing slewing ring comprising two mutually concentric bearing rings between which rolling elements roll, one bearing ring having a seal in sliding engagement with a cylindrical seal contact surface on the other bearing ring, characterized in that the seal contact surface (5) is a finite band (6) of a wear resistant material secured to a retention surface (7,16,22,30,40) of the bearing ring.

Abstract: A chain tightener with a dampening piston guided in a housing and axially acted upon by a spring in the chain tightening direction, and a radially resilient stop ring which cooperates with recesses of the housing and the dampening piston and limits its stroke while allowing a return movement of the dampening direction opposite to the chain tightening direction, wherein the housing (1) has a receiving groove (10) and the dampening piston (3) has an insert edge (25) for the stop ring (26) wherein during sliding of the dampening piston (3) into the housing (1) the insert edge (25) shifts the stop ring (26) until the latter radially snaps into the receiving groove (10), that a locking groove (18) for the stop ring (26) is provided at the dampening piston (3) which is defined on the one hand by a stop end face (19) and on the other hand by a stop ramp (20) wherein the stop ramp (20) fits under the stop ring (26) snapped in the receiving groove (10), that the stop end face (19) shifts the stop ring (26) under the a

Abstract: A mechanical-hydraulic actuating element for a belt tightener especially for internal combustion engines comprising a piston (11) guided in a cylinder (10) between which a spring (14) acts so that piston (11) and cylinder (10) are urged apart wherein a pressure space (19) as defined by piston (11) and cylinder (10) is separated from an oil reservoir (16) by a check valve (20) which allows the free oil passsage from the oil reservoir (16) into the pressure space (19) while the annular gap between piston (11) and cylinder (10) is dimensioned so that oil can flow under pressure which counteracts the force of the spring (14) from the pressure space (19) into the oil reservoir (16) through the annular gap, characterized in that the oil reservoir (16) is designed as a circular ring-shaped hollow space which surrounds the cylinder (10) and is defined toward the outside by a hollow cylindrical cup-shaped housing (15) which is sealed at its open end by an elastic bellows seal (29) attached to the housing (15), on the

Abstract: A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and comprising a cup-shaped housing (1) formed by a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which a cam abuts, a radial flange (4) provided in the bore of the hollow cylindrical wall (2) at a distance from the end member and guides for longitudinal movement of the hydraulic play compensating element (6) in a bore (5) concentric to the hollow cylindrical wall (2), characterized in that the radial flange (4) is a separate unit made of a material which has a higher thermal expansion coefficient than steel and the radial flange is inserted with its outer surface (7) in liquid-tight manner in the bore of the hollow cylindrical wall (2) and fixed therein.

Abstract: A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and being contacted at one end face of the valve tappet by a cam and bearing with a second end face against the end of a valve stem, the tappet comprising a cup-shaped housing comprised of a hollow cylindrical wall closed at one end by an end member against the outside of which the cam abuts and a cylindrical guide sleeve concentric with the cylindrical wall and surrounded by an external oil reservoir and in which the play compensating element is guided for longitudinal movement and abuts at its end against the valve stem characterized in that the valve tappet is comprised of three main structural elements of(a) the outer metallic cup-shaped housing (1)(b) a polymeric inner element (4,31,32) accommodated therein defining the guide sleeve and forming the external oil reservoir (17) together with the cup-shaped housing (1) and(c) the self-adjusting play compensating element (7) guided for longitu

Abstract: A method for the production of a cage made of castable or injection moldable polymeric material for rolling elements of a rolling contact bearing whereby the cage has pockets for receiving the rolling elements and contains a porous lubricant carrier, and the pockets have perforated walls to provide a direct contact between the lubricant carrier and the rolling elements. The cage is made in an injection mold or casting mold provided with cores for forming the pockets, characterized in initially inserting the lubricant carrier (5,24) into the mold (1,19), then closing the mold (1,19) whereby the lubricant carrier is elastically deformed by the cores (12,35,36) and finally surrounding the lubricant carrier (5,24) with polymeric material except at its supporting surface (14,38) and its surfaces engaging the cores (12, 35, 36).

Abstract: 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.

Abstract: In a chain tightener with a dampening piston guided in a housing and axially acted upon by a spring in the chain tightening direction wherein the dampening piston is retainable by a mounting ring within the housing in a blocking position which is released through axial pressure in the direction opposite to the chain tightening direction, the inprovement comprising the mounting ring (30) snaps into a groove (29) which is located at the forward end of the dampening piston (3) and is provided with a bevelled surface (28) and an adjacent latch surface (27), and that the mounting ring (30) is shiftable onto the latch surface (27) via the bevelled surface (28) with a tool insertable in a gap (31) between the housing (1) and the dampening piston (3) wherein the mounting ring (30) engages in a notch (13) of the housing (1) thereby blocking a movement of the dampening piston (3) relative to the housing (1).

Abstract: A structural element made of injection moldable or castable polymeric material comprising an external tubular element, an inner tubular element essentially concentric with the latter and integrally connected with the latter by ribs arranged in planes extending essentially in the direction of the longitudinal axis of the structural element, characterized in that the ribs (3) have a radius (R.sub.1) verging into the bore wall (7) of the external tubular element (1) which is considerably less than the radius of curvature (R.sub.2) of the bore wall (7) section connecting the radii (R.sub.1) of two adjacent ribs (3), the radius of curvature (R.sub.2) being smaller than the radius (R.sub.3) of the circle circumscribing the bore wall (7).

Abstract: An elastic spacer to be inserted between adjacent balls of a ball bearing and having recesses on its faces turned toward the balls into which the balls partially engage, characterized in that the spacer (1) has an outer contour (3) that can be inscribed in a cylinder and its length (L) corresponds to at least one half the diameter of the ball and has in its bore a conical partition (4) which, at least in its central region contiguous to the cone tip (5), is subdivided into elastically resilient tongues (7) by slots (6) extending approximately radially, one ball (2) making approximately punctiform contact in the center and the other ball (2) abutting on the partition (4) in a contact circle.

Abstract: An hydraulic valve clearance compensation element comprising a housing in which a pressure piston is guided and a pressure space is disposed behind the pressure piston, an oil inlet chamber with an oil inlet opening to supply oil to the pressure space, characterized in that the pressure space (13) and guide means (5) for the pressure piston (6,7) is formed by the base (1), the oil inlet chamber (23) is provided between the base (1) and a housing sleeve (18) which is arranged concentrically at the piston side of the base (1) and the oil inlet opening (26) is provided on the housing sleeve (18).

Abstract: A polymeric cage for cam rollers in an overrunning clutch comprising an end ring connected to a plurality of crossbars defining roller pockets axially open on one side and leaf spring elements integrally on the crossbars for acting on the cam rollers, the spring element (4) at the outer wall surface of the crossbar extends outside the adjacent pocket in its unassembled state and becomes bent substantially radially inwardly during insertion of the roller whereby it is bent inwardly after insertion of cam roller (6).

Abstract: A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an ice being located between a cam of a cam shaft and an end of a valve stem, the tappet comprising a cup shaped housing (1) closed at one end by an end member (3) against the outside of which the cam abuts and a cylindrical guide sleeve (6) concentric with a cylindrical wall (2) and arranged at its end away from member (3) in the center of an annular flange element (5) which at its outer circumference merges into the cylindrical wall (2) of the housing (1) and guide sleeve (6) is spaced at an opposite end from end member (3), a self-adjusting hydraulic play compensating element (10) being guided for longitudinal movement in the guide sleeve (6) comprising an inner piston (12) and an outer piston (11), the two pistons telescoping and defining oil pressure chamber (22) which communicates through a bore in the inner piston (12) closed by a check valve (21) with a central oil reservoir (13) disposed in inner piston (12), the o

Abstract: A pulley comprising an outer rim provided with an outer running surface for a pulley belt and a hub concentric with the rim and a dampening element connected to the rim and hub in a non-rotating manner, the rim and hub being rigidly supported to one another in a radial and axial direction and the rim capable of moving at an angle to the hub in the circumferential direction, the rim and hub being made of a hard polymeric material and the dampening element being made of a softer polymeric material, the outer rim (3,15,22) and the hub (4,14,21) are connected to form an integral element by leaf spring-type ribs (6,16,23) having their least bending resistance moment around axes running parallel to the longitudinal axis of the pulley (1,13,20).

Abstract: A self-adjusting hydraulic valve tappet arranged in a bore of a cylindrical guide bore of a cylinder head of an internal combustion engine and being contacted at one end face by a cam of a shaft and bearing with a second end face against a valve stem, the tappet comprising a cup shaped housing comprised of a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which the cam abuts and a cylindrical guide sleeve (6,30,32) concentric with the cylindrical wall (2) and arranged in the center of an annular flange element (5) which at its outer circumference merges into the cylindrical wall (2) of the housing and defines an annular oil reservoir (14) between the cylindrical wall (2) and the cylindrical guide sleeve (6,30,32), the oil reservoir (14) being supplied with oil through a bore (15) leading to the outside of the housing, a self-adjusting hydraulic play compensation element (13) being guided for longitudinal movement in the guide sleeve (6,30,32) and bearing with an end f

Abstract: Radial rolling bearing with adjustable clearance comprising two concentric races whose outer facing surface areas are provided with a groove, the grooves defining the raceway for the rolling elements, a slot is provided in the area of the center plane of the rolling bearing extending radially from the bottom of one of the grooves over only a portion of the race depth so that the slotted race has a partial raceway at both sides of the slot wherein the slot width is changeable by means acting on the race and causing a deformation of the race, characterized in that at least one partial track (6) is defined by a race wire (7) which is provided with rounded back (8) at the one side facing the race (1) and is swingably mounted relative to the race (1) in a circumferential groove (9) of the latter.

Abstract: A method of assembling a universal joint comprising two shafts provided with yokes at their ends and connected by means of a universal joint spider having journals supported in bores in the yokes by bearing cups which are unilaterally closed by a bottom wherein the end faces of the journals abut against the bottoms of the bearing cups, comprising initially centering the universal joint spider and the shafts relative to each other and stationarily clamped, then pressing the bearing cups in the bores in the yokes and axially fixed therein wherein the yoke arms, if necessary, are widened radially outwardly and are always immovably fixed radially inwardly, characterized in that the axial position for each bearing cup (6) in the respective bore (3) of the yoke (5) in which the bottom (9) of the bearing cup (6) abuts against the end face (34) of the respective journal (1) is measured or determined and the pressing process of the bearing cup (6) in this position is either terminated or based on this position, the pr

Abstract: An interlocking thrust washer is disclosed as well as a method for its manufacture. It is made from a flat wire section which is bent into a ring and held together by a complementing tongue and mouth which are formed of opposite ends of the wire. By this method, there is no material wasted.

Abstract: A ball joint comprises a pin carrying a ball which is pivotally received in a house cup. The ball is supported both axially and radially on the pin by spaced apart sets of angular contact rolling bearings.