Abstract: A pin connection structure is used in a floating type brake disc assembly. The assembly is made up of a hub, and an annular disc which is concentrically disposed around the hub with a clearance therebetween. The hub and the disc have plural sets of semicircular connecting dents opening toward the clearance to thereby form respective inserting holes. A hollow pin is inserted into each of the inserting holes with a washer fitted on that one end of the hollow pin which is subsequently caulked radially outward for fixing the washer in position. The hollow pin is made of a metal having a surface-treated layer, and the caulked end of the hollow pin is formed into a convex shape in at least part of the end portion.

Abstract: A pin connection structure is used in a floating type brake disc assembly. The assembly is made up of a hub, and an annular disc which is concentrically disposed around the hub with a clearance therebetween. The hub and the disc have plural sets of semicircular connecting dents opening toward the clearance to thereby form respective inserting holes. A hollow pin is inserted into each of the inserting holes with a washer fitted on that one end of the hollow pin which is subsequently caulked radially outward for fixing the washer in position. The hollow pin is made of a metal having a surface-treated layer, and the caulked end of the hollow pin is formed into a convex shape in at least part of the end portion.

Abstract: To stabilize a friction coefficient of a dust seal member or brake-gap adjustment seal member to a piston in a disc brake regardless of temperature change. At least an inner circumferential surfaces of a dust seal member and a brake-gap adjustment seal member, attached to a brake caliper, are coated with a friction reducing agent.

Abstract: A motorcycle in which a front end portion of a rear swing arm for rotatably supporting a rear wheel is swingably supported via a supporting shaft by an engine supported by a body frame. The rigidity of a rear swing arm is enhanced without increasing the weights of the supporting shaft and the like. Upper end portions of a pair of right and left bracket are fixed to both ends of a supporting shaft. A cross-pipe connects lower end portions of the brackets and is fixed to the engine at a position under the supporting shaft. A pair of right and left rotatably supporting portions are swingably supported by the supporting shaft at positions between the brackets and the engine.

Abstract: To stabilize a friction coefficient of a dust seal member or brake-gap adjustment seal member to a piston in a disc brake regardless of temperature change. At least an inner circumferential surfaces of a dust seal member and a brake-gap adjustment seal member, attached to a brake caliper, are coated with a friction reducing agent.

Abstract: A low noise roller chain includes a rigid roller made of metal and an elastic roller made of elastic material that are arranged end to end and fitted on a bushing between two opposed inner plates so as to jointly form a roller assembly. The width of the elastic roller is 13 to 45% of the overall width of the roller assembly, and the thickness of the elastic roller is larger than the thickness of the rigid roller by 5 to 25% of the thickness of the elastic roller. With the elastic roller thus constructed, noise generated upon abutment of the roller chain with a sprocket can be effectively suppressed without deteriorating the durability of the rigid metal roller. The elastic roller may be arranged in a zigzag pattern in the longitudinal direction of the roller chain.

Abstract: In a master cylinder device for a vehicle having a master cylinder with a cylinder body attached in the vicinity of a grip of a steering bar handle, and an operating lever which is supported on the cylinder body through a pivot and is pulled toward the grip to thereby push a piston of the master cylinder, the cylinder body is mounted in such a position that, below the axis of the bar handle, the axis of the cylinder body is substantially orthogonal to a vertical plane which includes the axis of the bar handle, whereby the master cylinder can be mounted even in a narrow space on the bar handle in a motorcycle and the like having a steering bar handle.

Abstract: The shock absorber includes an oil pressure damper (1), a piston rod (2) and a cushion spring (3), wherein the cushion spring (3) contacts to the piston rod side with an end thereof and another end (6) thereof contacts to a spring receiving face (8) of a spring seat (7). Since the spring seat (7) is integrated with an adjuster (10) by engaging claws (9) with the adjuster (10) and is also integrated with a movable cover (20), the spring seat (7), the adjuster (10) and the movable cover (20) rotate and move to an axial direction as one body.