Abstract: The proposed chain tightener is provided with a damping piston (3) in a guide bore (2). A stop ring (8) is provided between the damping piston (3) and the housing (1). The stop ring (8) cooperates with grooves (9, 17, 13) and stops (11, 10, 14) on the housing (1) and on the damping piston (3), preventing the damping piston (3) from sliding too far into the housing (1). To allow the damping piston (3) to be locked in position in the bore (2), it is proposed that the stop ring (8) should be clamped in a locking position between two contact surfaces (12, 16) on the housing (1) and damping piston (3) respectively, the contact surfaces (12, 16) being inclined in relation to the axis of the damping piston.

Abstract: The invention concerns a hydraulic play-compensation element including a groove (11) in the housing (1) to be located in such a way that, whatever the position of the plunger (2), a length (19) of the plunger is always supported by the cylinder wall above the groove and the securing ring (12) is centered radially around the plunger by means of a recess (14) in the plunger, the recess having a ramp at least at its lower end. The invention thus avoids weakening of the material in the upper part of the plunger.

Abstract: A freewheel cage (1) arranged between two concentric metal machine components (2,3) and comprising at least one reinforcing ring (14) and a plurality of segments (4) made of an injectable or castable material and arranged on a periphery of the reinforcing ring (14), said segments (4) comprising pockets (7) for locking elements (8) defined between axial crossbars (5) and end sections (6) integral thereto, the locking elements (8) being spring-mounted between facing locking surfaces (9, 10) of the machine components (2,3) while expansion gaps (18) are formed between consecutive segments (4), and at least one sliding surface (20) associated to the freewheel cage (1) is arranged on a periphery thereof for sliding contact with a cylindrical surface (10) of one of the machine components (3), the reinforcing ring (14) is inserted into grooves (15) of the segments (4), and the segments (4) and the reinforcing ring (14) respectively comprise recesses (16) and projections (17) which engage positively with one another,

Abstract: The invention concerns a tensioner for traction drives which includes a base element and a tension roller support arranged partly concentric with each other, and further including a torsion spring which is guided on a bush and braces these two elements against each other. According to the invention, a tension bush (20) which includes a longitudinal slot (21) is inserted between the bush (6) and the inner diameter of the torsion spring (13) so as to bear against the inner periphery of the torsion spring (13).

Abstract: In a bearing housing (1) for a form-fitted reception of an outer bearing ring (3) of a rolling bearing comprising a protective cap (7) for closing the bearing housing (1) at one end, the jacket of the protective cap (7) exhibiting at least two outward projecting, spaced retaining projections (10, 11) which retain the protective cap (7) in the bearing housing (1) and which can be introduced axially into end inserting pockets (5) of the bearing housing (1), characterized in that the bearing housing (1) is provided with a circumferential annular groove (6) for receiving the retaining projections (10, 11) when the protective cap (7) is turned, which annular groove (6) communicates with the inserting pockets (5) in the circumferential direction of the bearing ring (3) which configuration guarantees a secure fixing of the protective cap (7) in the bearing housing (1).

Abstract: The invention concerns a rolling bearing for linear movements comprising a carrier which is displaceable along a guide rail and supported on two longitudinal sides of the guide rail on several pairs of rolling element circuits, a one-piece cage being associated with each longitudinal side and each rolling element circuit being comprised of a rectilinear row of load-transmitting rolling elements guided by the cage, a row of returning rolling elements arranged in a return passage in the carrier and two rolling element deflector arches connecting the two said rows at ends thereof, a part of each deflector arch being arranged in the one-piece cage as a continuation of the rectilinear row of rolling elements while another part of the deflector arch is arranged in a head piece disposed on an adjacent end face of the carrier.

Abstract: A device (1) for simultaneous actuation of at least two gas exchange valves (2) of an internal combustion engine comprising a bridge-type cam follower (3) arranged in driving relationship between a camshaft and the gas exchange valves (2) and serving to directly transmit a stroke motion caused by a control cam (4) of the camshaft to the gas exchange valves (2), said cam follower (3) being guided by guiding means (18,19) for vertical displacement in a cylinder head and comprising a cam contacting element (31) on which the control cam (4) runs, characterized in that the cam contacting element (31) in the cam follower (3) is displaceable relative to the cam follower (3) so that the cam follower (3) can be uncoupled from a stroke-transmitting motion of the control cam (4).

Abstract: A steel component is provided on its surface with an electroplated anti-corrosive coating of a metallic material and has a hardness of at least 650 HV, the anti-corrosive coating being thinner than the surface roughness which the hardened component had before the application of the protective coating. Advantageously, the component is a rolling bearing component with a surface roughness R.sub.z of 0.3 to 9.0 .mu.m and a coating thickness of 0.1 to 3.0 .mu.m. Preferably, the anti-corrosive coating comprises a zinc-cobalt alloy, a zinc-iron alloy or a zinc-nickel alloy coating. It is possible to add iron, tin, copper or chromium to the coating composition.

Abstract: A tappet (1) for a valve drive of an internal combustion engine, which tappet (1) is guided for axial displacement in a reception bore of a cylinder head by a skirt (3) and is closed by a bottom (4) at a cam-proximate end, the skirt (3) comprising a first bush-like section (6) and a second bush-like section (7) of approximately equal diameter separated from each other preferably in a region of a central transverse plane, the first section (6) being connected to the bottom (4), while the second section (7) proceeds longitudinally from the first section (6), characterized in that the hardened first bush-like section (6) is connected to the unhardened second bush-like section (7) by interlocking and a method and apparatus for its preparation.

Abstract: A switchable support element for a lever valve drive of an internal combustion engine comprising a hollow cylindrical housing arranged with an outer peripheral surface in a reception bore of a cylinder head, an inner element supported on the housing by a compression spring being arranged for axial displacement within the housing, while one front end of the housing or of the inner element bears at least indirectly against a finger lever and a second front end bears against he cylinder head.

Abstract: A two-part tappet is designed to be adaptable to different cam contours. Radial bores (11, 12) are provided in the base sections (2, 3) for receiving at least one radially shiftable piston (13) for coupling the sections (2, 3).

Abstract: An angular thrust disc has a Z-shaped cross sectional profile, a free end of whose radially outer angular portion comprises radially inward directed projections arranged axially spaced from a free end thereof and made by chipless stamping, which projections engage into a peripheral groove of a shaft or a housing, and a free end of a radially inner angular portion of the angular thrust disc comprises circumferentially spaced and radially outward directed crimpings and recesses which form an installation safeguard and permit an admission of oil into the thrust bearing.

Abstract: A radial piston pump (1), preferably for pressure medium supply of an anti-lock system of vehicle brakes, with a rotating pump shaft (3), an end section of which has a pivot (5) extending eccentrically to a longitudinal center axis of the pump shaft (3), there being arranged on the pivot (5) a rolling bearing on whose outer ring (9) are supported by their plane end faces (13) pump plungers (12) in star arrangement in a pump housing (2) and extending radially to the pump shaft (3), characterized in that the rolling bearing is designed as a needle bearing (6) with the needle elements rolling directly against the shaft pivot (5), the outer ring (9) being produced as a deep-drawn sheet metal ring with chiplessly formed edges (10,11) on both sides, in which needle-shaped rolling elements (7) are guided via a cage (8) and in which the outer ring (9) is made with a core hardness of at least 300 HV1.

Abstract: A machine part includes a surface suitable for rolling contact and/or sliding contact on another machine pad and made by an at least two-stage honing process, with a first honing step effecting a surface texture exhibiting a plurality of peaks and a plurality of pits and defining a mean profile line, and a second honing step for removal of the peaks to a level of the mean profile line for forming a plateau-like tenure that is interrupted by crossing pits, whereby the depth of the pits from the first honing step is maintained. Subsequently, abrasive grain is pushed into the surface for creating a crater-like recess, thereby displacing material at random in horizontal and venial directions for at least partially closing the pits. Mounds created during material displacement and positioned above the mean profile line are removed through a subsequent polishing process.

Abstract: A tappet (1) for a valve drive or an internal combustion engine comprising a hollow cylindrical housing (2) guided for axial displacement by a jacket (3) thereof in a reception bore (4) of a cylinder head (5), an end of the housing (2) facing a cam (8) being closed by a bottom (7), a guide sleeve (11) arranged concentrically in the tappet (1) for guiding a hydraulic clearance compensation element (10) being supported by a connected web (12) against the jacket (3) which is made of two separate, bush-like sections (14,15) of approximately equal diameter separated from each other in the region of a central transverse plane, and a first cup-shaped section (14) of the jacket (3) being connected at a cam-proximate end thereof to the bottom (7), characterized in that the second, lower section (15) comprises an extension (16) starting axially adjacent the first section (14) and extending into an immediate vicinity of the bottom (7), the second section (15) with its extension (16) has a smaller wall thickness than the

Abstract: A locking device for a positional fixing of a displaceable adjusting element for a selector shaft of a mechanical gear transmission of a motor vehicle comprising an outer housing (2) and, displaceably guided therein, a locking pin (8) loaded at one end by a compression spring (14) which is supported on a bottom (15) and causes a stroke movement of the locking pin (8), the selector shaft comprising a recess which is engaged by a spherical locking element (11) retained in an end of the locking pin (8) facing away from the compression spring, the locking device further comprising an electric switching element (25) which can be activated by an actuating element arranged on the locking pin (8), characterized in that the actuating element is an compensation element (16a to 16d).

Abstract: A radial bearing with an outer race ring or bush arranged between the bearing in a housing bore having an integrally formed portion which is bent at a certain angle to a bearing axis and merges into a portion extending coaxially with the outer race ring so that a structural unit open in an axial direction and having spring elastic properties is formed that can be economically manufactured and used in a wide variety of areas.

Abstract: A bearing assembly for supporting a shaft without play, in particular for use with a steering shaft in a steering column, includes a plurality of needle-like rollers that are circumscribed by a thin-walled, split bush for elastically loading the rollers in radial direction. Fitted about the bush is an elastic ring that applies a preload on the bush and has at least one peripheral surface formed with neighboring ridges of relatively greater radial dimension and relatively smaller radial dimension in alternating relationship.

Abstract: The invention concerns a tension roller made of a plastic material for adjusting a tension in a belt drive, comprising a wheel (7) having an inner ring (9) and an outer ring (10) connected to each other by axially oriented, circumferentially spaced ribs (12) and by a central web (8), the wheel (7) being rotatably mounted on a support element (2) which bears by a running face against the belt (3). According to the invention, successive ribs (12) enclose different angles with reference to a central point of the wheel.

Abstract: A finger lever (1) used together with a camshaft (10) for actuating gas exchange valves (6, 7) of an internal combustion engine, which finger lever for simultaneously actuating two gas exchange valves (6, 7) is configured as a forked finger lever (1) and is supported at one end on a support element (2, 2a) and bears at an opposite end against an end of a shaft of a gas exchange valve (6, 7) the support element (2, 2a) comprising a device for compensating valve clearance, characterized in that a clearance compensation element is arranged on at least one of the ends of the forked finger lever (1) facing the ends of shafts of the gas exchange valves (6, 7).