Abstract: Disclosed is a cooling air intake structure for a V-belt drive continuously variable transmission, which is disposed beside the rear wheel of a small vehicle and which does not permit muddy water and dust to enter therein. A cooling air inlet through which cooling air is taken in is formed at a position beside a transmission case and above a cooling fan side opening formed in the transmission case opposite to a drive pulley. A cooling air passage extending from the cooling air inlet to the side opening is formed so as to surround the side opening. Cooling air taken in through the cooling air inlet is guided so as to flow upward first and then flows downward along a U-shaped cooling air passage to the side opening of the transmission case beside the cooling fan.

Abstract: Disclosed is a radiator cooling structure for cooling a radiator of a water-cooled power unit mounted on a small vehicle and disposed on a laterally outer side of the small vehicle, which radiator cooling structure improves the efficiency of cooling an internal combustion engine by using a head wind. The radiator is provided with a radiator cover having a louver for guiding cooling air to the radiator. The louver is formed such that a rear part thereof is more protruded laterally outward than a front part thereof. The louver of the radiator cover has parallel slats tilting forward, and a lower body cover is provided with a cooling air intake opening capable of guiding a head wind toward the louver positioned obliquely above and rearward of the cooling air intake opening.

Abstract: Disclosed is a cooling air intake structure for a V-belt drive continuously variable transmission, which is disposed beside the rear wheel of a small vehicle and which does not permit muddy water and dust to enter therein. A cooling air inlet through which cooling air is taken in is formed at a position beside a transmission case and above a cooling fan side opening formed in the transmission case opposite to a drive pulley. A cooling air passage extending from the cooling air inlet to the side opening is formed so as to surround the side opening. Cooling air taken in through the cooling air inlet is guided so as to flow upward first and then flows downward along a U-shaped cooling air passage to the side opening of the transmission case beside the cooling fan.

Abstract: Disclosed is a radiator cooling structure for cooling a radiator of a water-cooled power unit mounted on a small vehicle and disposed on a laterally outer side of the small vehicle, which radiator cooling structure improves the efficiency of cooling an internal combustion engine by using a head wind. The radiator is provided with a radiator cover having a louver for guiding cooling air to the radiator. The louver is formed such that a rear part thereof is more protruded laterally outward than a front part thereof. The louver of the radiator cover has parallel slats tilting forward, and a lower body cover is provided with a cooling air intake opening capable of guiding a head wind toward the louver positioned obliquely above and rearward of the cooling air intake opening.

Abstract: A rocker arm arranged between a camshaft and a valve which opens/closes an intake port or an exhaust port. A rolling bearing for supporting a support hole formed in a rocker arm is of a type of bearing wherein a plurality of needles are mounted on an inner side of an outer peripheral shell, and the outer peripheral shell is fixed to the support hole, the cam follower includes an outer ring which is supported on a periphery of a cam follower shaft which is held by a pair of left and right arm portions of the rocker arm by way of a plurality of rollers, a position of the outer ring and a position of the rollers in the lateral direction are restricted by the arm portion, and an outer diameter of the outer ring is set equal to or less than an inner diameter of the support hole.

Abstract: In an ultraviolet exposure apparatus, substances contained in an atmosphere contacting a lens surface are reduced, the substances generating accumulations on the lens surface. Openings are formed in the wall of a lens barrel to allow the atmosphere to be replaced by a proper gas. The proper atmospheric gas may be a gas not containing oxygen such as a nitrogen gas, or clean air obtained by intentionally generating accumulations by applying ultraviolet light to source air. A ultraviolet light source is preferably cooled by a cooling system different from the cooling system of a lens optical system.