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: An axial rolling bearing includes a cage having pockets for retaining rolling elements between two plane-parallel bearing disks for forming a structural unit through interlocking engagement. At least one bearing disk exhibits a peripheral edge which is turned in to form an axial collar which surrounds the cage with clearance and extends towards a radial plane of the other bearing disk to form at least one annular gap. The cage is provided in an area of the annular gap with through-bores which are radially spaced from the pockets and are defined by a diameter, with the annular gap having a radial dimension which is equal or greater than the diameter of the through-bores.

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).

Abstract: An overrunning clutch comprising two concentric machine components (1,2) rotatable relative to each other and having locking surfaces (13,14) formed on their mutually facing peripheral surfaces, and, arranged therebetween, a plastic cage (4) comprising end rings (15) connected to each other by crossbars (16), pockets (17) for locking elements (3) spring-urged against the locking surfaces (13,14) being formed between circumferentially adjacent crossbars (16), the plastic cage (4) further comprising at least one radial projection (19) which engages into a recess (20) of one of the machine components (2) to prevent rotation of the plastic cage (4) relative to this machine component (2), characterized in that the radial projection (19) is arranged on a crossbar (16).

Abstract: A device (1) for adjusting valve timing in an internal combustion engine, disposed within a control gear of at least one camshaft on a drive pinion (3) which is in driving relationship with this camshaft, said device (1) comprising an adjusting piston (2) which is axially displaceable by a hydraulic medium and whose first and second end faces (11,12) delimit a first and a second pressure chambers (13,14) while a peripheral surface (15) of the adjusting piston (2) bears sealingly against a housing (16) which delimits the first and the second pressure chambers (13,14) radially outwards, the adjusting piston (2) comprising two oppositely oriented helical gear sections, (6,7) and first (6) of said two helical gear sections cooperates with a corresponding gear (5) of a driving element (4) connected to the drive pinion (3), while second (7) of said two helical gear sections cooperates with a gear (8) of a driven element (9) connected to the camshaft, a stop element (18,19) or an end portion of the housing being arr

Abstract: In a belt or chain tensioner a sliding bearing ring is arranged between an element rigidly connected to the housing and an element rigidly connected to the tension arm. In order to achieve an improved damping, the sliding bearing ring is provided at one place with a through-slot into which engages a projection on one of the two elements. In addition, the sliding bearing ring is preferably provided with at least two, and preferably more, axially oriented grooves which define narrow and flexible lamellae formed between them. The lamellae are inclined with respect to and bear against a facing peripheral surface of one of the two elements in order to obtain a direction-dependent damping, since the lamellae are easily pushed aside in one direction of rotation but are entrained and pushed up into an upright position in the opposite direction of rotation.

Abstract: A roller lever (1) of a casting material configured as a finger lever for a valve drive of an internal combustion engine and comprising a first end portion (2) and a second end portion (4) connected to each other by side walls (7, 8) whose central portions (6) define a free space (9) in which a rotatably mounted supporting roller (10) is guided, said side walls (7, 8) comprising, in a region of the supporting roller (10), circular ring-shaped running surfaces (13, 14) facing the free space (9), the roller lever (1) further comprising a mold parting line (15) resulting from manufacture in a casting mold having a mold parting, characterized in that the mold parting line (15) between two halves of the casting mold extends outside of the running surface (13, 14) along a peripheral contour (16) of the running surfaces (13, 14) and a roller lever of a casting material configured as a rocker arm for a valve drive of an internal combustion engine, one end region of the roller lever being a fork-shaped region for rece

Abstract: A sealing arrangement for a bearing bush of a cardan spider of a universal joint of a propeller shaft, in which a bearing journal is mounted on a rolling bearing, said sealing arrangement comprising an armored seal inserted into the bearing bush at a free end thereof and having at least one sealing lip which bears against a surface of the bearing journal under pre-tension, characterized in that the sealing arrangement comprises a seal (1,21) whose armoring (6) assures an axial positional fixing of the seal (1,21) by a positive engagement with an inner surface (8) of the bearing bush (2).

Abstract: The invention concerns a radial rolling bearing having cylindrical rolling elements which roll between an inner and an outer ring while individual spacers are disposed between every two adjacent rolling elements, the spacers comprising, on both sides of their central longitudinal plane, contact surfaces while being guided during rotation of the radial rolling bearing by one of their end sections on a raceway of the inner or the outer ring.

Abstract: A method of leakproof first filling of a hydraulic valve actuating tappet (1) with hydraulic oil,a) comprising almost completely filling the central oil reservoir (7) together with a high pressure chamber (18) situated axially between the bottom (11) of the pressure piston (10) and the guide sleeve (5), and the annular oil reservoir (17), with hydraulic oil, andb) filling at least the supply bore (19) leading to the annular oil reservoir (17), with a lubricating grease or a pasty material (20) which is flow-resistant at ambient temperature.

Abstract: A tappet (1) for a valve drive of an internal combustion engine, characterized in that an upper edge (22) of the cylindrical element (15) extends directly along the underside (8) of the housing bottom (7) except in a region of a trough-like formation (24) provided in the cylindrical element (15) in a region of the underside (8) of the housing bottom (7) for oil transfer from the canal (19) into the annular oil reservoir (18), the ratio of the width of the recess (24) at an upper edge thereof facing the bottom of the width of the canal (19) is .gtoreq.1.75.

Abstract: A process for the thermochemical treatment of thin-walled structural elements made of steel comprising enriching an edge zone of a thin-walled structural element with nitrogen and carbon at 590.degree. to 700.degree. C. to harden the edge zone whereby an intermediate layer (3) is formed in the diffusion zone (2), said intermediate layer comprising 1 to 3% by weight of nitrogen and at most 0.8% by weight of carbon and cooling the said thin-walled structural element under an inert atmosphere at a rate of 50.degree. to 100.degree. C. per minute to room temperature to form a nitrogen austenite and/or braunite phase between the connection layer (1) and the basic structure (4) with increased fatigue strength.

Abstract: A differential gearing comprising a differential case (2) mounted in a gearbox casing (1) and connected via a crown wheel (6) to a drive pinion (4) of a third motion shaft (5), axle shafts (9) being mounted in the differential case (2), characterized in that the axle shafts (9) are mounted in the differential case (2) on a clearance-free or pre-tensioned rolling bearing (11).

Abstract: The invention concerns a device for continuous angular adjustment between at least two shafts, a crankshaft and a camshaft of an internal combustion engine, in driving relationship particularly, comprising an adjusting element (4) which is connected to a shaft to be adjusted while being arranged in an axial direction thereto and comprising a hydraulically actuatable piston (14) which is connected to a pressure medium circuit, characterized in that an end region of the shaft to be adjusted, which can be the camshaft (5) or an intermediate shaft, is surrounded by a fixed connecting plate (8a,8b) which comprises pressure medium ducts (6,7) for pressure medium supply to the adjusting element (4).

Abstract: A planetary transmission comprising a planet carrier (6) connected rotationally fast to a driving shaft (3), a planet gear (7) of which planet carrier (6) is simultaneously in mesh with an annulus (9) fixed on a housing (1,2) and with a sun gear (10) connected rotationally fast to a driven shaft (12) arranged concentric with the driving shaft (3), each of the driving shaft (3) and the driven shaft (12) being mounted for rotation relative to the housing (1,2) on at least one bearing (16,17) and outer and inner rings (22,25 31 34) of said bearings (16,17) being seated on bearing seats (5,14,11,15), characterized in that at least one of two bearing seats (5,14,11,15) of each bearing (16,17) comprises at an axial end thereof, a resilient projection (19,24,27,32) engaging by elastic reverse deformation, an end face of the inner or outer bearing ring (22,25,31,34) seated thereon.