Abstract: A method for producing a wear resistant coating as well as a wear resistant coating is provided, which is applied to predetermined surfaces of machine parts (1) that are exposed to wear by friction, in particular for internal combustion engines. The coating is made of at least one tetrahedral amorphic carbon layer (4) that is devoid of hydrogen or practically devoid of hydrogen, with the layer being applied to the predetermined surface (2) of the machine part (1) and including sp2 and sp3 hybirdised carbon for reducing the friction and for increasing the wear-resistance of the predetermined surface of the machine part.

Abstract: The present invention relates to a process for producing a wear-resistant coating and to a wear-resistant coating on predetermined surfaces of machine or engine parts, in particular for internal combustion engines, which are exposed to frictional wear, comprising at least one nanocrystalline functional layer (4) made up of at least two CrNx phases for reducing friction and increasing the wear resistance of the predetermined surface (2) of the machine or engine part (1).

Abstract: The invention relates to thin-walled rolling bearings, such as needle bearings, which are produced without the removal of material and the outer rings of which form a structural unit and are produced from a cold-rolled strip. According to the invention, the outer rings are produced from a cold-formable, fully hardenable steel, a ratio of from 1:20 to 1:5 being set between their wall thickness and the diameter of the bearing needles, and the fully hardened wall having a core hardness of ?600 HV and a surface hardness of ?680 HV. The invention makes it possible for bearings to withstand higher static bearings than bearings made from conventional steels while taking up the same installation space.

Abstract: A thin-walled stainless bearing component, in particular a rolling bearing component, such as bearing ring, sleeve or bush, produced without material-removing machining by being deep-drawn from a cold-rolled strip with a carbon content of 0.15-0.25% and a chromium alloying content of at least 12%, and having a martensitic microstructure which is enriched with dissolved nitrogen at least at a side edge zone.

Abstract: The present invention relates to a process for producing a wear-resistant coating and to a wear-resistant coating on predetermined surfaces of machine or engine parts, in particular for internal combustion engines, which are exposed to frictional wear, comprising at least one nanocrystalline functional layer (4) made up of at least two CrNx phases for reducing friction and increasing the wear resistance of the predetermined surface (2) of the machine or engine part (1).

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 master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

Abstract: A master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

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 master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

Abstract: A master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

Abstract: A master cylinder for use in the power train of a motor vehicle to actuate the brakes or the friction clutch is designed to avoid the generation of screeching noise and/or the transmission of stray movements to the piston rod in response to shifting of the piston relative to the housing and relative to the sealing element(s) between the piston and the housing. This can be accomplished by causing the piston to turn relative to the housing and the sealing element(s) during axial movement in the housing and/or by installing one or more dampers between the piston and the housing and/or between the piston and the piston rod. The dampers can constitute separately produced parts and/or specially configured and/or finished surfaces provided on the piston and contacting the housing and/or the sealing element(s). The invention also relates to improvements in the configuration and/or the material(s) of the piston.

Abstract: A method of making a formed body from iron alloys, in particular a cage for use in a radial roller bearing, axial roller bearing or linear roller bearing, includes the steps of treating a metal strip by heat treatment or thermochemical treatment for providing the metal strip with desired properties with respect to hardness, strength and wear resistance, and punching a plurality of spaced slots into the metal strip for formation of pockets for receiving rolling elements.

Abstract: A cup-shaped tappet (1) for actuating a gas exchange valve (17) of an internal combustion engine, comprising a cylindrical jacket (6) closed at one end by a bottom (7) and guided in a bore (2) of a cylinder head (3), the valve tappet (1) being actuated by a cam (4) of a camshaft (5) acting on the bottom (7) of the tappet (1) characterized in that the bottom (7) and the jacket (6) are steel components having respective wall thicknesses (A),(B) dimensioned so that a product (P.sub.1) of the wall thicknesses, (A).times.(B) expressed in millimeters is <2.3, the wall thickness (A) of the bottom (7) being 1.7 to 2.4 mm and the wall thickness (B) of the jacket (6) being 0.7 to 1.0 mm.

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 cold strip for manufacturing deep-drawn, case-hardened precision components, particularly rolling bearing and engine components, in which a core material (2) is roll clad at least on one side with a cladding material (3), characterized in that the core material (2) is a low-carbon cold or hot steel strip and the cladding material (3) is a cold or hot strip with increased carbon content, the core (2) and the cladding material (3) having different physical and chemical properties which complement each other, particularly with regard to deep-drawability, hardenability, constant reverse-bend fatigue strength and wear resistance.

Abstract: A pulser ring made of a ferritic iron alloy with the following composition (in wt. %)max. 0.12% C,max. 1.00% Si,max. 1.00% Mn,max. 0.045% P,max. 0.030% S andmax. 18% Cr, with the rest being iron with impurities conditional upon the melting process and a method of heat treating the same.

Abstract: In a tightening device for a drive belt in an internal combustion engine, particularly for a toothed belt in the camshaft gear with a tension roller supported on a pivoting lever comprising a tension spring acting upon the pivoting lever in the direction of tension and a blocking device opposing the motion of the pivoting lever, whose blocking element changes its position as a function of the temperature, the blocking element formed as an end stop by the free end (17) of a preferably plate shaped stop body (18) whose other end (19) is held in a fixed housing (1) wherein the end stop in the operating state of the internal combustion engine is disposed at a distance from the adjacent support face of the pivoting lever. The tightening device with the thermally adjustable end stop avoids a tooth jump, particularly in the case of long belts.

Abstract: A light metal tappet particularly for the timing gear of an internal combustion engine comprising a tappet base body and a steel plate anchored at the contact face for the control cams of the timing gear and having a hardened surface, characterized in that the steel plate is made of an austenitic base material which is carbon dispersion hardened, has the same coefficient of thermal expansion as aluminium and comprises a nitrided surface.

Abstract: A method of producing a hardened non-magnetizable roller bearing element made of an austenitic material comprising carburizing the near-surface material layer of a roller bearing element in an oxygen-free atmosphere at high temperatures and then cooling the roller bearing element and the element produced by the process having a load bearing capacity equal to steel roller bearing elements but still non-magnetizable.