Abstract: A semiconductor apparatus that ensures heat dissipation using a heat dissipating member with multiple fins formed by folding a metal plate, a manufacturing method for the semiconductor apparatus, and a power converter are obtained. The semiconductor device is bonded to a lead frame. The lead frame is provided on an insulating layer and a metal base plate is provided on the face opposite to the face of the insulating layer on which the semiconductor device is bonded. The semiconductor device, the lead frame, the insulating layer, and the metal base plate are sealed with a sealing member in such a way that a portion of the lead frame and a portion of the metal base plate are exposed. The exposed portion of the metal base plate exposed from the sealing member is inserted in an opening of a support frame. A heat dissipating member is bonded to both the metal base plate and the support frame.

Abstract: The clutch includes a clutch pressure plate having central through-holes for guiding coolant oil toward friction discs and a clutch case having an inner wall confronting the through-holes and an oil guide rib projecting therefrom. The misted coolant oil splashed by rotation of a clutch outer member is collected by the oil guide rib so that the oil is directed to the clutch discs through the through-holes to thereby enhance the cooling effect for the clutch discs.

Abstract: A power transmission casing apparatus in a motorized two-wheeled vehicle which comprises a case main body extending from one lateral side of an internal combustion engine to one lateral side of a rear wheel in rear thereof and supporting rotatably a wheel axle of the rear wheel. The case main body is applied with a cover member for containing therein liquid-tightly a reduction gear means, and is applied with another cover member for containing therein a V-belt means.

Abstract: A power transmission casing apparatus in a motorized two-wheeled vehicle which comprises a case main body extending from one lateral side of an internal combustion engine to one lateral side of a rear wheel in rear thereof and supporting rotatably a wheel axle of the rear wheel. The case main body is applied with a cover member for containing therein liquid-tightly a reduction gear means, and is applied with another cover member for containing therein a V-belt means.

Abstract: A power transmission for a two-wheeled vehicle includes a variable-diameter drive pulley mechanism (2) mounted on a drive shaft (1) connected to an engine (E), a variable-diameter driven pulley mechanism (22) mounted on a driven shaft (18) operatively coupled with a driven wheel (W), and a clutch (36) mounted coaxially on the driven shaft (18) and operatively connected to the driven pulley mechanism (22). The drive and driven pulley mechanisms (2,22) are interconnected by a V-belt (7). The drive and driven pulley mechanisms (2,22) have axially movable members (5,24) located on opposite sides of the V-belt (7) adjacent to the engine (E) and the clutch (36) to allow parallel displacement of the V-belt (7) during the changing of the diameters of the pulley mechanisms (2,22), to prevent belt twisting or distortion and to prevent the belt (7) and pulley mechanisms (2,22) from being loaded while the vehicle is moved around with the engine (E) turned off.

Abstract: A multi-cylinder engine for a motor vehicle comprises at least two cylinders mounted in mutually displaced relationship with respect to longitudinal and transverse directions of the vehicle. The crankshaft for one of the cylinders is located at a higher level than the crankshaft for the other cylinder. A crankcase assembly of the engine is vertically divided into pieces by a plurality of planes extending perpendicular to the crankshafts and each plane passing through each center of the cylinders. The engine provides first and second gears mounted on the primary shaft, a crank gear for one of the crankshaft, a crank gear for the other crankshaft, and an idle gear. The first gear is in meshing engagement with the crank gear for one of the crankshaft, while the second gear is connected to the other crank gear through the idle gear.

Abstract: A power transmission for a two-wheeled vehicle includes a variable-diameter drive pulley mechanism (2) mounted on a drive shaft (1) connected to an engine (E), a variable-diameter driven pulley mechanism (22) mounted on a driven shaft (18) operatively coupled with a driven wheel (W), and a clutch (36) mounted coaxially on the driven shaft (18) and operatively connected to the driven pulley mechanism (22). The drive and driven pulley mechanisms (2,22) are interconnected by a V-belt (7). The drive and driven pulley mechanisms (2,22) have axially movable members (5,24) located on opposite sides of the V-belt (7) adjacent to the engine (E) and the clutch (36) to allow parallel displacement of the V-belt (7) during the changing of the diameters of the pulley mechanisms (2,22), to prevent belt twisting or distortion and to prevent the belt (7) and pulley mechanisms (2,22) from being loaded while the vehicle is moved around with the engine (E) turned off.

Abstract: A power transmission casing apparatus in a motorized two-wheeled vehicle which comprises a case main body extending from one lateral side of an internal combustion engine to one lateral side of a rear wheel in rear thereof and supporting rotatably a wheel axle of the rear wheel. The case main body is applied with a cover member for containing therein liquid-tightly a reduction gear means, and is applied with another cover member for containing therein a V-belt means.

Abstract: A power unit for a motor-cycle of a type having a power transmission case which supports at the rear end thereof a rear axle and which is integrally joined together at one end of a crank case of an engine, wherein the power transmission case is constituted by an inner half directly connected to the crank case and an outer half separably connected to the inner half, the rear axle being fitted onto the inner half of the power transmission case, a driving power transmission mechanism is disposed in the inner half to connect the rear axle and a crank shaft of the engine. A pedal shaft having an engine starting pedal connected at one end thereof and an engine starting shaft adjacent to the crank shaft on the same axis is fitted onto the outer half of the power transmission case. A starting power transmission mechanism is disposed in the outer half to connect the crank shaft and the engine starting shaft.

Abstract: Improvement in a power transmission system in a motor vehicle which comprises a clutch associated with a crank shaft of an engine, a group of power transmission gears, an output shaft for the power transmission gears, a driving gear mounted on the output shaft, a propeller shaft, a universal joint for joining both output shaft and propeller shaft at their respective end parts, a set of final speed reduction gears, wherein there is provided a buffer means for preventing said output shaft for the transmission system and the propeller shaft connected therewith from becoming overloaded, the buffer means being mounted on one part of the output shaft and constructed with a pair of cam pawls, one of the cam pawls being mounted on the output shaft integrally with the driving gear, and the other cam pawl being spline-connected on the output shaft, and a compression spring to effect engagement between the pair of cam pawls.