Abstract: A pick-up style utility vehicle has a driver's seat, a seat next to the driver's seat, one or more passenger seats behind the driver's seat, and a cargo bed. Each of all the passenger seats and the seat next to the driver's seat is independently changeable between a first state in which the seat is seatable and a second state in which the seat is retracted so that an occupied space of the seat can be used as part of the cargo bed. Preferably, a screen shield partitioning the cargo bed and a riding space in front of the cargo bed is provided. The screen shield is divided into left and right screen shield members.

Abstract: A pick-up style utility vehicle according to the present invention has a driver's seat, a seat next to the driver's seat, one or more passenger seats behind the driver's seat, and a cargo bed. Each of all the passenger seats and the seat next to the driver's seat is independently changeable between a first state in which the seat is seatable and a second state in which the seat is retracted so that an occupied space of the seat is used as part of the cargo bed. Preferably, a screen shield partitioning the cargo bed and a riding space in front of the cargo bed is provided. The screen shield is divided into left and right screen shield members.

Abstract: A gear 11 on a crankshaft 10 is made to engage with an internal gear 21 having twice the number of teeth of the gear 11, cams 22 are formed on the exterior surface of the internal gear 21, and the cams 22 are connected with valve actuating mechanisms 40 for actuating an exhaust valve 44 and an intake valve 40 to open or close. The gear 11, the internal gear 21, etc. have the function of an oil pump.

Abstract: There is disclosed a four-cycle engine in which a crankshaft and a cam shaft are disposed generally parallel to each other, and an intake port and an exhaust port are formed in a cylinder head. The intake port and the exhaust port are arranged in such a manner that a line passing through the centers of the intake port and the exhaust port is non-parallel to the axis of the crankshaft. With this arrangement, an intake passage and an exhaust passage can be greatly shortened, and therefore intake efficiency as well as exhaust efficiency can be enhanced, thereby enhancing the performance of the engine. In an air-cooled engine, the overheating of the engine is greatly restrained.

Abstract: A cooling device is provided for an engine having a cylinder head, a crankcase and a crankcase cover. The device includes a jacket formed in the crankcase for retaining therein a liquid cooling medium, and a plurality of fins is provided on the crankcase. A cooling fan is provided and an air leading cover is arranged to surround the fan, cylinder head, crankcase and at least a portion of the crankcase cover for leading air downwardly to the fins to cool the cylinder head, crankcase and crankcase cover.

Abstract: Muffler apparatus including an elongated muffler which is connectable to an engine body via two exhaust pipes. The muffler includes a first expansion chamber which extends along the entire length of the muffler, and the two exhaust pipes are connected separately adjacent opposite ends, or in the vicinity of the ends, of the muffler on the side of the muffler at which the first expansion chamber is located.

Abstract: A dust removing apparatus for an intake air cleaner in which the air cleaner is disposed in the vicinity of a passage of a high speed air flow and an opening in a wall of the air passage confronting high speed air flow within the passage. As a result dust is removed from the high speed air flow.

Abstract: An engine comprises a first cylinder and a second cylinder adapted to perform explosions at such timing that an interval from the explosion in the first cylinder to the explosion in the second cylinder is shorter than an interval from the explosion in the second cylinder to the explosion in first cylinder, an intake manifold having an intake passage, and branch passages communicating the intake passage with the first and the second cylinders.

Abstract: An intake manifold is provided which communicates with left and right intake passages located respectively in left and right cylinder banks of an internal combustion vee-engine. The intake manifold comprises a single inlet passage portion, and two branch passage portions which branch from an outlet end of the inlet passage portion and which communicate respectively with the intake passages. Each of these passage portions is formed straight so that the intake manifold can be cast by means of metal dies. Also disclosed in a method of manufacturing the intake manifold.

Abstract: A breather device adapted for an internal combustion engine which includes a lubricant separation chamber having a check valve opening by a positive pressure in the crank chamber and being provided with hole(s) communicating the lubricant separation chamber with a crank chamber, a gas exhausting section connected to an intake air line, and with a device for returning a separated lubricant to the crank chamber. The lubricant return device comprises a gap section communicating to a bottom of the lubricant separation chamber and in contact with an end face of an appropriate revolving shaft such as a cam shaft, and forced oil return passage(s) being formed in or on said revolving shaft, which communicate(s) the crank chamber to the gap section, and integrally rotate(s) with the revolving shaft to forcibly send lubricant oil deposited in the gap section to the crank chamber.

Abstract: A motor vehicle having an air exhaust duct interposed between a radiator and an engine, the air exhaust duct being operative to guide cooling air that has cooled the radiator and became warm to flow in a direction in which the cooling air flows away from the engine without coming into contact therewith.

Abstract: A muffler cooling device for a V-type engine which includes an engine cooling fan disposed at an end of a crankshaft. An air guide plate is provided at a part of a duct through which air sucked by the cooling fan flows, and the duct has at least one opening through which the air flows as being guided by the air guide plate. The arrangement is such that the air having flown through the opening is led, through a space surrounded by a V-bank formed by cylinder heads and an intake manifold, to an area in which a muffler and exhaust pipes extending from the cylinder heads to the muffler are arranged.

Abstract: A lubricating apparatus for an engine of vertical crankshaft type according to the present invention includes an oil pan arranged at a lower portion of a crank case for supporting a vertical crankshaft, and an oil tank having a volume larger than that of the oil pan arranged independently from the oil pan, and wherein an outlet of the oil tank is communicated with each of lubricating portions through the oil pan, an intake portion of the oil tank is communicated with the oil pan and the oil in the oil pan is fed into the oil tank by means of an appropriate oil feeding mechanism.

Abstract: A lubrication device for a vertical crank shaft engine. A portion of a crank case, which houses the crankshaft with a small clearance at a given range of the lower side of the crankshaft extending vertically and expands upwards of the housing portion, forms an oil reservoir between the crankshaft, and a pumping member fixed to the crankshaft for rotation is provided in the lower portion of the oil reservoir.

Abstract: A power transmission apparatus has a first shaft and a second shaft which are supported by an aluminum housing, and an iron gear and a synthetic resin gear which are respectively mounted on the two shafts and are engaged with each other. The synthetic resin used for the synthetic resin gear contains an aromatic polyamide fiber.

Abstract: A liquid-cooled engine system comprising a liquid-cooled engine and a radiator which are arranged within an engine room. A duct is arranged within the engine room, for guiding air flow having passed through the radiator, to the outside of the engine room without exposure of the air flow to the engine. At least a part of the exhaust muffler connected to the engine is disposed within the duct so that the exhaust muffler is cooled by at least a part of the air flow guided by the duct. Preferably, the engine is a vertical type V-engine.

Abstract: An engine having a vertically disposed crankshaft includes an engine cover for closing a whole upper area of an engine body and having a skirt portion protruding downwardly from a periphery of the engine cover, and a cooling fan with a flywheel fixed to an output shaft of the engine below the engine body. The engine further includes a protruded shroud formed integrally on a wall portion of the engine body to completely close an annular clearance between the wall portion and the skirt portion, and a plurality of apertures formed in the protruded shroud to constitute a cooling air intake inlet.

Abstract: An improved work vehicle is disclosed in which a vertical shaft V-type engine having vertically supported crankshaft with the pair of right and left cylinders being arranged in V-shape is housed inside the front bonnet that is forwardly downwardly inclined at the top. The work vehicle, while having no less excellent performance in terms of power output, noise, and vibration, provides more increased operability and a wider range of forward visibility than conventional horizontal opposed type engine vehicles.

Abstract: A one-piece crankcase and cylinder block structure for V-type internal combustion engines is disclosed, which is formed by casing and comprises a crankcase with its one end wall side opened and a cylinder block including at least a pair of right and left cylinders opposed to each other at 90.degree.. The cylinders are formed to project at their skirt portion into inside of the crankcase forming a longitudinal space between the protruded ends of the skirt portions to house a camshaft. Another space is defined adjacent to the opened side of the crankcase between the protruded ends of the skirt portions to house a camshaft gear. Since the construction is such that, in casting, the directions in which the segments of mold and the cores are ejected from the casting are uniformly distributed, and the distance over which the cores and mold segments are ejected is greatly minimized. Thus, a relatively small casting machine can be employed to properly cast such a one-piece crankcase and cylinder block structure.

Abstract: An engine and power units employing the engine are provided which include a crankshaft oriented vertically and operatively connected to the engine, a liquid-cooled radiator arranged above the engine substantially perpendicular to the crankshaft, and a cooling fan interposed between the engine and the radiator and operatively connected to the crankshaft. The engines and power units may be employed in motor vehicles and other equipment such as electrical generators.