Abstract: A clutch release bearing includes a housing, a first bearing ring having a skirt for fixed rotative securement of the first bearing ring to the housing, a revolving second bearing ring connected to the separating clutch via a spring element, and a plurality of rolling elements guided between the first and second bearing rings. Seals are provided on both sides of the rolling elements at a distance thereto and involve a sealing arrangement which is securely fixed to the housing and comprised of at least two components to establish two sealing zones for sealing an annular gap between the first and second bearing rings. The sealing arrangement cooperates with a planar surface of the revolving bearing ring and assumes a desired position, when the revolving bearing ring is installed with the assistance of a press-fit tool.

Abstract: The invention relates to a cage (1, 17, 30) for cylindrical rolling-contact elements (8, 9), especially a needle cage, in which two rolling-contact elements (8, 9) that are in contact with one another at their lateral surfaces are arranged in series in the circumferential direction in a pocket (7, 23, 39) and each of the two is guided parallel to a cage axis (1.1, 17.1, 30.1) by a web (6, 22, 33) connecting adjoining side rings (2, 3, 18, 19, 31, 32) to one another, there being stub-shaped webs (15, 29, 40) on the side rings (2, 3, 18, 19, 31, 32) in the center of the pockets, between the two rolling-contact elements (8, 9), said webs projecting partially into the pocket (7, 23, 39), between the rolling-contact elements (8, 9).

Abstract: A clutch release bearing includes a housing, a first bearing ring having a skirt for fixed rotative securement of the bearing ring to the housing, a revolving second bearing ring connected to the separating clutch via a spring element, and a plurality of rolling elements guided between the first and second bearing rings. Seals are provided on both sides of the rolling elements at a distance thereto, wherein one seal is configured to seal an annular gap between the first and second bearing rings and includes a sealing arrangement which is securely fixed to the first bearing ring and comprised of at least two components to establish two sealing zones, wherein the second bearing ring and the sealing arrangement interact in such a way that a desired installation position of the sealing arrangement is automatically establishes as the second bearing ring is installed.

Abstract: The invention concerns an electrically rotatable shaft, and more particularly, an adjusting shaft (1) of a fully variable mechanical valve train of an internal combustion engine, said shaft comprising an adjusting cam (2). The low-friction and lash-free configuration of a drive required for a rapid and exact functioning of the fully variable mechanical valve train is achieved by the fact that the adjusting shaft (1) is rotated by an actuator (3) that comprises an adjusting lever (4) connected rotationally fast to the adjusting shaft (1), while the free end of the adjusting lever is articulated preferably on the screw nut (10) of a screw-and-nut drive (5) that is driven by an electromotor (6).

Abstract: A release bearing for a separating clutch installed in a motor vehicle, includes a casing movable in an axial direction and operatively connected to an actuating mechanism, a non-rotatable bearing ring having a ring bottom supported by the casing; and a revolving bearing ring having a annular flange. Guided between the bearing rings is a plurality of rolling elements. An engagement disk made of a low-friction and wear-resistant material is securely fixed to the annular flange, and a spring member is operatively connected to the separating clutch and cooperates with the annular flange of the revolving bearing ring, wherein the spring member bears against the engagement disk.

Abstract: A rotating piston positioning device to adjust the angle of rotation of a camshaft with respect to a crankshaft of an internal combustion engine. The device includes a drive member (5) that is driven by the crankshaft and a driven member (10) that is fixed to the camshaft (4). At least the driven member (10) of the device (1) is formed of a lightweight metal and is bolted to the camshaft (4) by a central fastening screw (13), whereas the drive member (5) is radially supported external to the driven member (10) and transfers force to the driven member by at least two hydraulic pressure chambers located inside the device (1). The conical zone of force from the fastening screw (13) to the driven member (10) is carried by a special collar (16) made of a compression-resistant material that at the same time is a prefabricated pressure medium distributor of the device (1).

Abstract: A tappet (1) for the transfer of a lifting motion to a sliding part is provided having two parts, including a circular shaped section (2) with a base (5) connected to it as one piece and a separate dome-shaped socket (9) connected to the base (5) made of thin-walled material with a contact surface (10) for the sliding part. The tappet (1), whose socket (9) extends over a considerable length of the circular shaped section (2), can be economically manufactured.

Abstract: A release bearing includes a rolling-contact bearing having a non-rotatable inner ring, a rotating outer ring, and plural rolling members located between the inner and outer rings, An adjustment ring having a ring flange is provided for abutment against a disk spring of a clutch mechanism, and a sliding element made of bearing material is disposed in a support zone defined between complementary calotte-shaped portions of the outer ring and the adjustment ring so that the adjustment ring and the outer ring are movable relative to one another for effecting a self-adjustment of the release bearing.

Abstract: A method for the trenchless installation of new underground pipe accurately on line and on grade by microtunneling to install a pilot tube, installing a drill string along the pilot pipe line using a directional drilling machine, installing a back reamer to the drill string and using a directional drilling machine to pull back the reamer and install a product pipe behind the reamer. A pilot tube is installed on line and on grade by utilizing the guidance system of a microtunneling apparatus to install a pilot tubes between jacking and target shafts. A drill string is installed to displace the pilot tubes and a back reamer is attached to the drill string with a product pipe attached to the reamer. The reamer may be pulled using any suitable pulling device such as a directional drilling machine.

Abstract: A needle case or needle bush produced without cutting for a thin-walled needle bearing is produced without cutting from a cold-rolled strip, which is a heat-treated steel which has the disclosed chemical composition and the disclosed mechanical characteristic values. After a heat treatment, a surface hardness of 860 to 880 HV and a core hardness of 550 to 650 HV are achieved.

Abstract: A two-stage sealing arrangement for sealing an annular gap between an outer bearing ring and an inner bearing ring of a rolling-contact bearing, includes a first sealing element securely fixed to the outer bearing ring and having at least one sealing lip supported against the inner bearing ring. A second sealing element is disposed at an axial distance to the first sealing element, thereby defining a circular ring shaped sealing gap in a radial direction for accommodating, at least partially, a sealing material.

Abstract: A bridge bearing in which a substructure and a superstructure are displaceably connected to each other by means of a sliding bearing, whereby the displacement occurs in a linear and/or cardanic manner in at least one of the directions X, Y, and Z. The bearing is characterized in that a carriage (7) that is connected to a cover plate (10) is guided in a linear manner in the X and/or Y direction by two interspaced shafts (5, 4), respectively, on which displaceable slide bushings (9, 8) are arranged and/or the cover plate can be guided in a tiltable manner by a pivot bearing (18) in the Z direction. This combination of a linear and pivot bearing enables all alignment errors arising as a result of finishing inaccuracies, foundation subsidence, desired and undesirable slanting to be compensated and regulates the variations in lengths due to temperature and load.

Abstract: The invention concerns a device for the hydraulic adjustment of the angular position of a shaft (1) relative to a drive pinion (14), said device comprising a plate (2) fixed to the shaft to cooperate with the drive pinion (14) or with a component fixed to the drive pinion. The device comprises at least one ring-segment shaped section (2a) in the plate (2) and a means (4a) arranged on the drive pinion (14) or on said component to cooperate with the shaped section (2a) so as to divide the shaped section into two separate chambers (10, 11). The device further comprises a means for a selective hydraulic pressurization of the chambers (10, 11) for adjusting the relative angular position of the drive pinion (14) and the shaft (1).

Abstract: An engageable cam follower (1) for acting on a pushrod in the valve train of an internal combustion engine is provided. This cam follower (1) includes of a thin-walled hollow cylindrical housing (2) in whose borehole (3) is positioned an internal element (4) axially movable with respect to the housing (2). The housing (2) and the internal element (4) each possess a radial borehole (13, 10) aligned in a relative position to each other. Positioned in the radial borehole (10) of the internal element (4) is a piston (11) having a convex end (14) and movable toward the radial borehole (13) of the housing (2) for coupling the internal element (4) with the housing (2) in the relative position. According to the invention, the borehole (3) of the housing (2) is shaped in the area of the radial borehole (13) of the housing (2) as a flattening (15) extending in the longitudinal direction of the cam follower (1).

Abstract: A shifting device (1) for a speed change gearbox with a transmission component that can be shifted in a longitudinal direction and/or about its longitudinal axis in a pivoting manner, which for transmitting the shifting movements is equipped with a damping component (8), which is constructed from at least one ramp-shaped profile (9a), and at least one roller component (12) which is pre-loaded against ramp-shaped profile (9a) by means of spring action.

Abstract: A linear guide with a guide rail (25), on which a guide carriage (26) is supported for movement longitudinally, and with a drive to cause the longitudinal movement of the guide carriage (26), which is constructed as an electric motor with a motor component arranged on the guide rail (25) and a motor element arranged on the guide carriage (26). A distance-measuring system is allocated to the linear guide, which has a measuring strip and a measuring head (30) which is movable in relation to the measuring strip adjacent to the guide carriage (26) or the guide rail (25) extending parallel to the guide rail (25). The distance-measuring system is assigned an acceleration sensor operating with an eddy current sheet and an exciter block (28) partially surrounding it.

Abstract: In an adjustable-length shaft (1) for transmitting torques comprising a circular inner shaft component (2) that is mounted coaxially through a linear ball bearing for sliding telescopically in axial direction in a hollow outer shaft component (3), the inner shaft component (29 is mounted by two spaced-apart pre-stressed linear ball bearings (4) that are arranged on opposite end sections (6) of the inner shaft component (2) and are received in a reception bore (19) of the outer shaft component (3), a transmission of torque being achieved by a positive engagement of the inner and the outer shaft components (2, 3).

Abstract: A tensioning device for traction means, especially for toothed belts, is provided with a tensioning arm (3) on which a tensioning roller (1) is rotatably arranged. Furthermore a stopper (12) is provided which restricts a swiveling angle of the tensioning arm (3), whereby a detachable locking device (15) is provided through which the tensioning arm (30) and the stopper (12) are locked for joint swiveling into a position provided for the stopper (12).

Abstract: In a valve train of an internal combustion engine having a switchable support element (1), the lost motion spring (18) of the support element (1) is arranged axially offset next to the support element (1) while being coupled to an inner element (3) of the support element (1) by a crossbar (20). Due to this externally positioned spring (18), the support element (1) requires only a relatively small design space.

Abstract: The inventions provides a method of making a lever-type cam follower (2) out of thin-walled light-weight sheet metal for loading at least one gas exchange valve of an internal combustion engine, said cam follower comprising two side walls (12a, 12b) which, together with a crossbeam (11) that connects these side walls to each other, form a U-shaped cross-sectional profile pointing away from the gas exchange valve, the cam follower further comprising two finger-like tabs (5a, 5b) for receiving a stem end of the gas exchange valve, which tabs are configured on one end (3) of the cam follower (2) as extensions of the side walls (12a, 12b) and are bent through 180° onto an undersurface (9) of the crossbeam (11), said method comprising the following steps which may be supplemented with further intermediate steps: a) punching out a blank (1) out of sheet metal with the tabs (5a, 5b) being bulged outward in arc-shaped curves that are configured as mirror images of each other in respect of a central longitudinal