Abstract: A speed increasing gear used in a supercharger has a center roller connected to an output shaft, an outer wheel arranged eccentric to the center roller, and a plurality of intermediate rollers arranged within an annular space in which a width of the center roller with respect to a diametrical direction is uneven with respect to a circumferential direction of the center roller. The annular space is provided between the center roller and the outer wheel, and a pivot of at least one intermediate roller is movably arranged in a circumferential direction and a radial direction of the center roller.

Abstract: A speed increasing gear used in a supercharger has a center roller connected to an output shaft, an outer wheel arranged eccentric to the center roller, and a plurality of intermediate rollers arranged within an annular space in which a width of the center roller with respect to a diametrical direction is uneven with respect to a circumferential direction of the center roller. The annular space is provided between the center roller and the outer wheel, and a pivot of at least one intermediate roller is movably arranged in a circumferential direction and a radial direction of the center roller.

Abstract: A power transmission 14 for an engine 10 is structured such that a mounting surface 16A of a gear case (a front cover 16) with respect to a crank case 19, is line symmetrical with respect to a crank shaft 20 and that mounting holes 61A-61H of the gear case (the front cover 16) with respect to the crank case 19 are disposed in a point symmetrical position with respect to the crank shaft 20.

Abstract: An air filter apparatus for engine intake-air in which a filter support member is stretched in a filter attaching frame of an outer frame structure member, and filter is supported on the filter support member, wherein the filter is integrally incorporated with the filter support member.

Abstract: A hydraulic shock absorber is provided with a cylinder formed of a straight pipe, and inside the cylinder, opposite end portions of a base piston are fixed to the inner face by a pair of retainer member C-rings so that a free piston can be received in a lower portion of the cylinder.

Abstract: A main piston which divides the inside of a cylinder into chambers A and B has oil passages on the expanding side formed therethrough, and is mounted with a damping valve on the expanding side capable of closing the oil passages. The damping valve on the expanding side deforms in a deflecting manner to produce a damping force. A disc spring is disposed behind the damping valve on the expanding side to exert a biasing force on the rear face thereof. The disc spring is linked in an actuating manner to an operating rod mounted through a piston rod, thereby allowing a change of the biasing force exerted on the damping valve on the expanding side.