Abstract: Provided is a technique for suppressing the occurrence of density non-uniformities in an image formed on a sheet. An image forming apparatus, which forms an image on a recording material by transmitting driving force to a cartridge, includes: a frame having a positioning portion which positions the cartridge by contacting the attached cartridge; a driving force transmission rotating body which transmits driving force by engaging with a driving force receiving portion of the driven unit; and a circumferential surface which is provided in one portion of the frame and rotatably supports the driving force transmission rotating body.

Abstract: The waveguide is composed of a solid dielectric, and an outer conductor covering the periphery of the dielectric, the transverse section of the dielectric being rectangular and having a shape bulging outward on the pair of long sides, and the inner surface of the outer conductor adhering closely to the outer surface of the dielectric.

Abstract: An internal combustion engine includes a cylinder head, a crankshaft, intake and exhaust camshafts, first and second chain covers, a chain, and a fastening bolt. The first chain cover having a cutout includes a first flange positioned at a specific edge portion of the cutout, which is positioned between the crankshaft and the camshafts, and a first boss through which a shaft portion of the fastening bolt is passed. The cylinder head includes a second flange, and a second boss into which the shaft portion is inserted, and which is disposed coaxially with the first boss. The liquid gasket is held between the second flange and the first flange. A groove is provided in at least one of a position between the first flange and the first boss of the first chain cover and a position between the second flange and the second boss of the cylinder head.

Abstract: A drive transmission mechanism includes a rotatable member provided with a drive transmitting portion; and a shaft supporting the rotatable member; wherein the shaft has a large diameter portion, a small diameter portion having a diameter smaller than that of the large diameter portion, at least one middle diameter portion having a diameter smaller than that of the large diameter portion and larger than that of the small diameter portion, and a stepped portion at a boundary between the small diameter portion and the middle diameter portion.

Abstract: A cylinder liner has an upper portion and a lower portion with respect to an axial direction of the cylinder liner. A high thermal conductive film is provided on an outer circumferential surface of the upper portion. A low thermal conductive film is provided on an outer circumferential surface of the lower portion. The cylinder liner reduces temperature difference of a cylinder along its axial direction.

Abstract: A cylinder liner for insert casting used in a cylinder block is provided. The cylinder liner includes an outer circumferential surface having a plurality of projections. Each projection has a constricted shape. A film of a metal material is formed on the outer circumferential surface and the surfaces of the projections. As a result, the cylinder liner ensures sufficient bond strength with the casting material of a cylinder block, and sufficient thermal conductivity with the cylinder block.

Abstract: A cylinder liner has an outer circumferential surface on which a film is formed. The film functions to form gaps between the cylinder block and the cylinder liner. Alternatively, the film functions to reduce adhesion of the cylinder liner to the cylinder block. The cylinder liner suppresses excessive decreases in the temperature of a cylinder.

Abstract: A cylinder liner has an outer circumferential surface on which a film is formed. The film functions to form gaps between the cylinder block and the cylinder liner. Alternatively, the film functions to reduce adhesion of the cylinder liner to the cylinder block. The cylinder liner suppresses excessive decreases in the temperature of a cylinder.

Abstract: A cylinder liner has an upper portion and a lower portion with respect to an axial direction of the cylinder liner. A high thermal conductive film is provided on an outer circumferential surface of the upper portion. A low thermal conductive film is provided on an outer circumferential surface of the lower portion. The cylinder liner reduces temperature difference of a cylinder along its axial direction.

Abstract: A cylinder liner for insert casting used in a cylinder block is provided. The cylinder liner includes an outer circumferential surface having a plurality of projections. Each projection has a constricted shape. A film of a metal material is formed on the outer circumferential surface and the surfaces of the projections. As a result, the cylinder liner ensures sufficient bond strength with the casting material of a cylinder block, and sufficient thermal conductivity with the cylinder block.

Abstract: A silencer includes: a porous inner pipe provided in a peripheral wall thereof with a large number of small pores; an outer pipe surrounding the porous inner pipe; a sound absorbing material incorporated in an annular clearance between the porous inner pipe and the outer pipe; and a plurality of exhaust gas expansion chambers defined in the porous inner pipe and arranged such that an exhaust gas is sequentially passed through the exhaust gas expansion chambers. The sound absorbing material is formed of a heat-resistant fiber layer which is wound around an outer peripheral surface of the porous inner pipe with a binder interposed therebetween, and an outer peripheral surface of the heat-resistant fiber layer is press-fitted to an inner peripheral surface of the outer pipe with a predetermined interference. Thus, it is possible to prevent a reduction in sound vanish effect due to the leakage and short-circuiting of an exhaust gas and a reduction in engine power performance.

Abstract: A body frame (2) for a vehicle (1) of a straddle type, such as a motorcycle or a motorized tricycle, which has integrally formed, on a head tube (3) steerably suspending a front suspension (5), a reinforcement tongue (42; 142) for reinforcing the fastening between the head tube and a down tube (12) made of pipe. The reinforcement tongue is formed on a forged lower end piece (33) of the head tube and extends therefrom so as to asymptotically approach the underside surface of the down tube. The reinforcement tongue may additionally have fitted thereon a fish piece (146; 246) provided either in a pair with one at each side or as a single member, in accordance with necessary strength requirements.

Abstract: A vehicle which may be three-wheeled or four-wheeled, for instance, a buggy comprises a front wheel and a wishbone suspension for supporting the front wheel and a power unit. The body frame comprises a left subframe, a right subframe of essentially quadrilateral configuration, each subframe having an upper side, a front side, a lower side and a rear side. A reinforcing bar connects the front side and the lower side. The subframes form a first loop. The reinforcing bar forms a second loop with the upper side, the rear side, the front side and the lower side. The second loop is within the first loop. The first loop supports the front wheel wishbone suspension and the second loop supports the power unit. The front side has an upper portion and a lower portion and the lower side has a forward portion and a rear portion and the second loop is formed by the upper side, the upper portion of the front side, the rear portion of the lower side and the rear side.

Abstract: A fitting device for wind shield, wherein a wind shield plate is fixed directly to the body of a motor-cycle or to a fairing surrounding the motor-cycle body by means of threaded bolts and nuts which are breakable upon external shock being imparted to the wind shield plate, and the center portion of the wind shield plate is particularly held by a hinge, etc. which is swingable in the frontward direction alone so that, when excessive impact force is applied to the windshield, it falls frontward, thereby preventing the wind shield plate from flying backward to hit a motor-cycle rider or any person nearby.

Abstract: A fairing of a sturdy structure designed to give a maximum of driving safety without impairing the steerability of the vehicle. The yoke structure to which a windshield is secured is comprised of a central rod and a pair of side rods secured to the front end thereof and includes a forwardly open U-shaped top formation within which an instrument panel is positioned, enabling the rider to observe the instruments without lowering the direction of his sight to any substantial extent. A light shield is arranged to prevent any reflection glare otherwise occurring on the inside surface of the windscreen when the instruments are illuminated during drive at night. The yoke structure is designed to be detachably connected with the body frame of the motorcycle at three locations thereon by simple fastening means. The windshield not only protects the rider from wind, rain and dust but is adapted to serve a number of additional functions.