Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of through holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Abstract: A rolling bearing includes a rolling element made of a steel containing 0.9 to 1.1 wt. % C, 0.1 to 0.5 wt. % Si, 0.2 to 0.8 wt. % Mn, 1.0 to 1.8 wt. % Cr, with the balance being Fe and inevitable impurities. In the rolling bearing at least the surface of the rolling element includes carbides having an area fraction of 5% to 15%; of these carbides, carbides having an averaged particle diameter of 0.5 .mu.m or more share 50% or more of the area fraction of all the carbides; and of the carbides, carbides having an averaged particle diameter of 1 .mu.m or more share 2% or less of the area fraction of all the carbides; and wherein the rolling element has at least a Vickers surface hardness HV of 750 to 900.

Abstract: A surface treatment layer for reducing friction is formed either on the outer peripheral surface of the shaft or on the inner peripheral surface of the roller opposed to the outer peripheral surface of the shaft with a small gap between them, wherein surface damages are prevented by the surface treatment layer from occurring on the outer peripheral surfaces immediately after the engine starts and before the engine oil is supplied.

Abstract: The rolling/sliding outer ring of the cam follower apparatus is made to withstand peeling very well, even in severe lubrication conditions, by forming a surface layer in the depth 0 to 50 .mu.m from the outer peripheral surface of the outer ring, such that the maximum residual compressive stress in this surface layer is between 50 and 110 kgf/mm.sup.2, the hardness of this surface layer is between Hv 830 and Hv 960, and the amount of residual austenite in the surface layer is at least 7 volume %, and formed with continuous minute irregularities on the surface with convexities of the irregularities having an equivalent roundness diameter up to 15 .mu.m for the case that the concavities of the irregularities are assumed to occupy 80% of the total surface area, while the inner peripheral surface of the outer ring is superfinished.

Abstract: A rolling/sliding member for use in conditions of rolling and/or sliding contact with a mating member opposed to the rolling/sliding member under the following conditions;(a) the rolling/sliding member are formed with a large number of fine protrusions and depressions in at least the surface area which comes into contact with the mating member,(b) the total volume per unit area of the fine depressions is in the range of 5.times.10.sup.-8 to 5.times.10.sup.-7 cc/mm.sup.2, and(c) the average volume of the fine depression is 10 to 100 .mu.m.sup.3.

Abstract: The rolling/sliding outer ring of the cam follower apparatus withstand peeling very well, even in sever lubrication conditions, through the steps that on the outer peripheral surface of the outer ring, the depth of the surface layer is taken to be 0 to 50 .mu.m, and the maximum residual compressive stress in this surface layer is between 50 and 110 kgf/mm.sup.2, the hardness of this surface layer is between Hv830 and Hv960, and the average wavelength of the very minute protrusions on the surface is less than 25 .mu.m, and the amount of residual austenite in the surface layer exceeds 7 volume %, after processing, while the inner peripheral surface, of the outer ring is superfinished.

Abstract: A method of installing a roller bearing using a spacer made of an elastic material and supported in a space defined a plurality of rollers of the roller bearing, which spacer has at least a leading section having a tapered surface progressively reduced in diameter to the leading end of the spacer and at least two contact support sections having a maximum diameter of the spacer.

Abstract: A method of installing a roller bearing using a spacer made of an elastic material and supported in a space defined a plurality of rollers of the roller bearing, which spacer has at least a leading section having a tapered surface progressively reduced in diameter to the leading end of the spacer and at least two contact support sections having a maximum diameter of the spacer.

Abstract: A cam follower device which is incorporated in a valve driving mechanism for an engine to contact the outer peripheral surface of a cam secured to a cam shaft that rotates synchronously with a crankshaft of the engine, thereby transmitting the motion of the cam to a valve that opens and closes a suction port or an exhaust port in the enigne. A ring-shaped member which contacts the cam is formed from a ceramic material, and this ceramic ring-shaped member is rotatably supported around a steel shaft. The clearance between the inner peripheral surface of the ceramic ring-shaped member and the steel shaft is set within a specific range, thereby preventing the occurrence of problems, for example, noise, arising due to a difference in thermal expansion coefficient between the two members and thus improving the high-speed follow-up performance of the cam follower device.

Abstract: A bearing assembly includes a bearing including a rotatable inner race having a mounting portion integral with a rotatable member and having an annular first groove for rolling members formed in the outer peripheral surface thereof, an outer race fixedly disposed outside and concentrically with the inner race and having a second groove for rolling members formed in the inner peripheral surface thereof in opposed relationship with the first groove for rolling members, a plurality of rolling members interposed between the first and second grooves for rolling members, and a pair of seals disposed on the axially opposite outer sides of the rolling members for sealing the space between the inner and outer races; a pulser gear formed on that portion on the outer peripheral surface of the inner race which is positioned between the pair of seals and having convex portions and concave portions alternately formed circumferentially on the outer peripheral surface thereof; and a sensor mounted on the inner race and oppos