Cooling arrangement for all terrain vehicle
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorKazutaka Fukuda
Life of this patent
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Abstract
An all terrain vehicle has a cooling pump that is driven off a balancer shaft. The balancer shaft, in turn, is driven off a crankshaft. The cooling pump is preferably recessed inside of an outer surface of a crankcase cover member. Additionally, a lubricant pump is also driven off the balancer shaft and arranged inwardly from the cooling pump. The cooling pump is arranged to one side of the all terrain vehicle while a variable speed transmission is arranged to the other side of the all terrain vehicle.
Claims29
An all terrain vehicle comprising a frame, a seat mounted to an upper portion of the frame, at least one front wheel and at least one rear wheel connected to the frame, an engine and an engine transmission assembly mounted within the frame, the engine comprising a cylinder block, a cylinder head assembly attached to the cylinder block and a crankcase cover attached to the cylinder block generally opposite the cylinder head assembly, a cooling pump attached to a side of at least one of the engine and the engine transmission assembly, a crankshaft mounted for rotation within a crankcase generally defined by the cylinder block and the crankcase cover, a balancer shaft positioned generally rearward of said crankshaft and driven by the crankshaft, and the cooling pump drive driven off the balancer shaft, wherein the cooling pump comprises a laterally extending external surface and the engine transmission assembly further comprises a laterally extending external surface arranged such that the laterally extending external surface of the cooling pump is closer to a longitudinal center plane of the vehicle than the laterally extending external surface of the engine transmission assembly.
An all terrain vehicle comprising a frame, an engine mounted to the frame, the engine comprising a cylinder block, a piston mounted for reciprocation within the cylinder block, a connecting rod connected to the piston, a crankshaft having at least one throw, the throw of the crankshaft connected to the connecting rod, the crankshaft positioned within a crankcase, one end of the crankshaft carrying a flywheel magneto, the other end of the crankshaft being connected to a clutch, a cooling pump and a lubricant pump positioned rearward of the crankshaft and the cooling pump and the lubricant pump being connected to the crankshaft through a gear train, the gear train being positioned completely between a first longitudinally extending plane extending through the connecting rod and a second longitudinally extending plane extending through the an inner surface of the flywheel magneto, and the cooling pump comprising a housing positioned to a side of the second longitudinally extending plane opposite of the first longitudinally extending plane.
An all terrain vehicle comprising a frame, a seat mounted to an upper portion of the frame, at least one front wheel and at least one rear wheel connected to the frame, an engine and an engine transmission assembly mounted within the frame, the engine comprising a cylinder block, a cylinder head assembly attached to the cylinder block and a crankcase cover attached to the cylinder block generally opposite the cylinder head assembly, a cooling pump attached to a side of at least one of the engine and the engine transmission assembly, a crankshaft mounted for rotation within a crankcase generally defined by the cylinder block and the crankcase cover, the engine transmission assembly comprising a continuously variable transmission having a first drive member and a second drive member driven by the first drive member, said continuously variable speed transmission driving a change speed transmission, said change speed transmission comprising a final transverse drive shaft that engages with a longitudinally extending output shaft of said change speed transmission, said cooling pump being disposed between said final transverse drive shaft and said crankshaft of said engine, a balancer shaft disposed rearward of said crankshaft and driven off the crankshaft and a cooling pump drive driven off the balancer shaft.
An all terrain vehicle comprising a frame, an engine mounted to the frame, the engine comprising a cylinder block, a piston mounted for reciprocation within the cylinder block, a connecting rod connected to the piston, a crankshaft having at least one throw, the throw of the crankshaft connected to the connecting rod, the crankshaft positioned within a crankcase, one end of the crankshaft carrying a flywheel magneto, the other end of the crankshaft being connected to a clutch, a cooling pump and a lubricant pump positioned rearward of the crankshaft and the cooling pump and the lubricant pump being connected to the crankshaft through a gear train, the cooling pump being located on one side of the cylinder block, the transmission being located on the other side of the cylinder block and the lubricant pump being positioned between the cooling pump and the transmission.
Dependencies are inferred from the claim text.