Abstract: A suspension structure is configured to ensure a large stroke of a shock absorber in a suspension device without moving an upper end supporting position of a damper upward relative to a conventional mounting position. The suspension structure includes a rear suspension for suspending left and right rear wheels. The rear suspension includes left and right lower arms for supporting the left and right rear wheels by way of knuckles, and left and right rear shock absorbers interposed between the respective lower arms and a sub-frame of a vehicle body frame. A lower end connecting portion of the rear shock absorber is cantilevered to a front side of the lower arm.

Abstract: An arrangement structure of a starter motor in an all-terrain vehicle in which a minimum road clearance is secured sufficiently and lowering of the center of gravity and adequate weight distribution of the vehicle can be achieved. The starter motor is arranged in an area at the front portion of the vehicle with respect to a vertical line including a center point of a crankshaft of an engine, downwardly of a horizontal line including the center point of the crankshaft of the engine, and upwardly of a horizontal line including a lowermost portion of the crankcase of the engine in the vehicle.

Abstract: A suspension structure is configured to ensure a large stroke of a shock absorber in a suspension device without moving an upper end supporting position of a damper upward relative to a conventional mounting position. The suspension structure includes a rear suspension for suspending left and right rear wheels. The rear suspension includes left and right lower arms for supporting the left and right rear wheels by way of knuckles, and left and right rear shock absorbers interposed between the respective lower arms and a sub-frame of a vehicle body frame. A lower end connecting portion of the rear shock absorber is cantilevered to a front side of the lower arm.

Abstract: An arrangement structure of a starter motor in an all-terrain vehicle in which a minimum road clearance is secured sufficiently and lowering of the center of gravity and adequate weight distribution of the vehicle can be achieved. The starter motor is arranged in an area at the front portion of the vehicle with respect to a vertical line including a center point of a crankshaft of an engine, downwardly of a horizontal line including the center point of the crankshaft of the engine, and upwardly of a horizontal line including a lowermost portion of the crankcase of the engine in the vehicle.

Abstract: A four-wheel vehicle for traveling on an irregular road that is superior in weight balance and traveling stability. A rotating section (radial center line L3) of a torque converter T and a drive shaft (longitudinal center line L2) which transmits a driving force from a transmission mechanism M to front or rear wheels, are distributed right and left in an opposed relationship to each other with respect to a longitudinal center line (L1) of a vehicle body.

Abstract: In a power transmission path of a vehicle for traveling on uneven ground, a torque converter is provided so that torque transmission to a propeller shaft varies smoothly. Accordingly, it is difficult for the torque transmitted to the propeller shaft to exceed a tire slip limit. This arrangement suppresses slippage during traveling on uneven ground such as a muddy, marshy, sandy, snowy, or gravel road surfaces.

Abstract: To provide a motive-power transmission device for a vehicle including a torque converter, a gearbox, and a clutch for cutting off the transmission of motive power between the input shaft of the gearbox and the turbine of the torque converter. The gearbox is accommodated in the crankcase, and the motive-power transmission device is compact in the axial direction of the crankshaft. A motive-power transmission device for a vehicle includes the crankshaft and the input shaft of the gearbox journaled freely rotatably in the crankcase, their axes being parallel to each other; the torque converter is mounted on one end portion of the crankshaft; and the clutch is separated along the axial direction of the crankshaft from the torque converter and so mounted on one end portion of the input shaft that part of the clutch overlaps the torque converter as seen in the axial direction of the crankshaft.

Abstract: To provide a four-wheel vehicle for traveling on an irregular road superior in weight balance and traveling stability. A center line (L3) of a rotational axis of a torque converter and a longitudinal center line (L2) of a drive shaft or a propeller shaft, which transmits a driving force from a transmission mechanism M to front or rear wheels, are distributed right and left in an opposed relation to each other with respect to a longitudinal center line (L1) of a vehicle body.

Abstract: A gear transmission for keeping a load in balance at both ends of a crank shaft in an all-terrain saddle type vehicle provided with a transmitting unit capable of transmitting power from the crank shaft to the gear transmission and a generator connected to the crank shaft. A torque converter is provided with a lock-up clutch mounted on the crank case side of the torque converter and capable of directly connecting a pump to a turbine. A driving gear fixed to the turbine and capable of transmitting the output of the torque converter to the gear transmission is mounted on one end side of a crank shaft outside the crank case such that the lock-up clutch is sandwiched between the torque converter and the driving gear. A generator is mounted on the other end side of the crank shaft outside the crank case.

Abstract: In a power transmission apparatus for a vehicle having a gear transmission capable of transmitting power from a crankshaft of an engine to driving wheels by selectively establishing a plurality of shift stages of gear trains and a clutch for cutting power transmission from the crankshaft to the gear transmission in operating to shift the power transmission, when the clutch is operated to cut or connect in cooperation with the shift operation of the gear transmission, shift operability is promoted while avoiding an increase in weight. A gear transmission is shifted by a first actuator and a clutch is driven by a second actuator which is independent of the first actuator.

Abstract: A four-wheel vehicle for traveling on an irregular road that is superior in weight balance and traveling stability. A rotating section (radial center line L3) of a torque converter T and a drive shaft (longitudinal center line L2) which transmits a driving force from a transmission mechanism M to front or rear wheels, are distributed right and left in an opposed relationship to each other with respect to a longitudinal center line (L1) of a vehicle body.

Abstract: To provide a four-wheel vehicle for traveling on an irregular road superior in weight balance and traveling stability. A center line (L3) of a rotational axis of a torque converter and a longitudinal center line (L2) of a drive shaft or a propeller shaft, which transmits a driving force from a transmission mechanism M to front or rear wheels, are distributed right and left in an opposed relation to each other with respect to a longitudinal center line (L1) of a vehicle body.

Abstract: A power unit, including an engine and a transmission, is transversely arranged in a vehicle with a crankshaft arranged parallel to a traveling direction of the vehicle. Looking at a crankcase from the front, a camshaft is arranged to one side of the crankshaft. A balancer shaft is also located on the one side of the crankshaft and coaxailly drives an oil pump. The transmission and an oil tank are arranged on the opposite side of the crankshaft. The crankshaft includes a crank sprocket which drives the cam shaft via a cam chain and a cam sprocket provided on one end of the cam shaft. The cam sprocket and the oil pump are arranged on either side of a balancer attached to the balancer shaft. The power unit arrangement allows for an increase in the potential capacity of the oil pump of a dry sump type lubrication system without causing an increase in the size of a crankcase.

Abstract: Looking from a front toward a rear of a vehicle, a crankcase has a cross sectional shape which gets narrower towards its bottom. The crankcase includes a crankshaft which extends parallel to a direction of travel for the vehicle. A main shaft, a counter shaft and an output shaft of a transmission are arranged in a transmission chamber on one side of the crankshaft. An oil tank is provided on the same side of the crankshaft and outwardly of the transmission chamber. The oil tank is separated from the transmission chamber by a partitioning wall. The oil tank has a substantially crescent shape, with the lower end extending beneath the output shaft. An intake port of a feed pump is provided in the lowest part of the oil tank. An oil inlet for adding oil to the oil tank is provided just above the oil tank. An overflow hole to the transmission chamber is provided in the partitioning wall. The feed pump is provided on an opposite side of the crankshaft inside the crankcase.

Abstract: In a power transmission path of a vehicle for traveling on uneven ground, a torque converter is provided so that torque transmission to a propeller shaft varies smoothly. Accordingly, it is difficult for the torque transmitted to the propeller shaft to exceed a tire slip limit. This arrangement suppresses slippage during traveling on uneven ground such as a muddy, marshy, sandy, snowy, or gravel road surfaces.

Abstract: A gear transmission for keeping a load in balance at both ends of a crank shaft in an all-terrain saddle type vehicle provided with a transmitting unit capable of transmitting power from the crank shaft to the gear transmission and a generator connected to the crank shaft. A torque converter is provided with a lock-up clutch mounted on the crank case side of the torque converter and capable of directly connecting a pump to a turbine. A driving gear fixed to the turbine and capable of transmitting the output of the torque converter to the gear transmission is mounted on one end side of a crank shaft outside the crank case such that the lock-up clutch is sandwiched between the torque converter and the driving gear. A generator is mounted on the other end side of the crank shaft outside the crank case.

Abstract: A water pump for circulating the cooling water of an internal combustion engine, facilitates the formation of the water passage connecting the water pump to the cooling water passage in the cylinder block and can reduce manufacturing costs thereof. A water pump for circulating the cooling water of an internal combustion engine is connected to one end of a cam shaft for a valve system arranged in a cylinder head and is driven by the cam shaft. A delivery port of the water pump is extended near to a cooling water supply port formed in the side wall of a cylinder block and is connected to a cooling water passage in the cylinder block. The delivery poll of the water pump is extended to a position directly opposite to the cooling water supply port, and is connected to the cooling water supply port with a connection pipe. A mounting structure of a camshaft is capable of applying high speed rotation by shortening a length of push rods and also capable of facilitating maintenance such as replacement of cams.

Abstract: An arrangement for improving the cooling performance of an engine by suitably arranging an exhaust pipe and a valve mechanism with respect to the inclined direction of a cylinder block. A cylinder block is inclined in the rightward or leftward direction of a vehicle body, and an exhaust pipe and a valve mechanism are disposed along the inclined side wall of the cylinder block. The opposed side wall of the cylinder block, which has a large space in the vertical direction and exerts a large effect on the cooling performance of the engine, is less susceptible to thermal effects from the exhaust pipe and the valve mechanism, to thereby improve the cooling performance of the entire engine.

Abstract: A shaft having a sprocket fixed at one end thereof is reliably assembled to the supporting wall of an engine, with a reduced number of parts and man-hours required for assembly. A camshaft having a sprocket fixed at one end thereof is installed by engaging a pair of ball bearings with supporting holes on supporting walls of the engine. A crescent-shaped step partially cut in the loosing direction of an endless chain is formed on one supporting hole. An outer race of one ball bearing on the camshaft is engaged with the step. An endless chain is wound around the sprocket, and the one ball bearing is moved into the supporting hole, and the other ball bearing is correctly engaged with the other supporting hole, thereby completing assembly of the camshaft.

Abstract: An intake cam and an exhaust cam are formed integrally with a cam shaft, and a decompression cam is additionally provided adjacently to the front side of the exhaust cam. A rib is formed in back of the intake cam. A cylindrical surface portion having a diameter being the same as that of the outer periphery surface of a ball bearing for supporting the front portion of the cam shaft and being larger than the diameter of the base circle of the cam shaft, is formed on the front crank case, and a locking stepped portion is formed in back of the cylindrical surface portion. Cutout portions are formed in the locking stepped portion so that the cam shaft can be pulled forward in the state that the intake cam, exhaust cam and the decompression cam are arranged.