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US 8,136,498 B2Granted
Two-plane type crankshaft
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorHideki Fujiwara
Life of this patent
Estimating the term…
Abstract
An engine 20 includes a two-plane type crankshaft 30 and a balancer shaft 50 for reducing a primary couple of the balancer shaft 50. The crankshaft 30 includes a crankshaft body 30a and a first gear 38. The first gear 38 is disposed at one axial end side of a first crank web pair 31a disposed at the outermost one axial end side of the crankshaft 30. In the engine 20 including the two-plane type crankshaft, the weight of the engine can be reduced while securing high reliability.
Claims16
An engine, comprising:
- a crankshaft including a crankshaft body and a first gear mounted on the crankshaft body, wherein the crankshaft includes first, second, third, and fourth crank web pairs each having a pair of crank webs and sequentially disposed from one axial end side of the crankshaft to the other axial end side thereof, a first crank pin interconnecting the pair of crank webs of the first crank web pair, a second crank pin interconnecting the pair of crank webs of the second crank web pair and different in phase by about 90 degrees from the first crank pin, a third crank pin interconnecting the pair of crank webs of the third crank web pair and different in phase by about 180 degrees from the second crank pin, and a fourth crank pin interconnecting the pair of crank webs of the fourth crank web pair and different in phase by about 180 degrees from the first crank pin;
- and
- a balancer shaft for reducing a primary couple of the crankshaft, the balancer shaft including a second gear engaged with the first gear,
- wherein the first gear is disposed at one axial end side of the first crank web pair.
1 more element
An engine, comprising:
- a crankshaft including first, second, third, and fourth crank web pairs each having a pair of crank webs and sequentially disposed from one axial end side of the crankshaft to the other axial end side thereof, a first crank pin interconnect the pair of crank webs of the first crank web pair, a second crank pin interconnecting the pair of crank webs of the second crank web pair and different in phase by about 90 degrees from the first crank pin, a third crank pin interconnecting the pair of crank webs of the third crank web pair and different in phase by about 180 degrees from the second crank pin, and a fourth crank pin interconnecting the pair of crank webs of the fourth crank web pair and different in phase by about 180 degrees from the first crank pin, wherein a gear is formed on an outer crank web of the pair of crank webs of the first crank web, the outer crank web being located at one axial end side of the crankshaft;
- and
- a balancer shaft for reducing a primary couple of the crankshaft, the balancer including a gear engaged with the outer crank web.
A vehicle equipped with an engine,
- wherein the engine comprises:
- a crankshaft including a crankshaft body and a first gear mounted on the crankshaft body, wherein the crankshaft includes first, second, third, and fourth crank web pairs each having a pair of crank webs and sequentially disposed from one axial end side of the crankshaft to the other axial end side thereof, a first crank pin interconnecting the pair of crank webs of the first crank web pair, a second crank pin interconnecting the pair of crank webs of the second crank web pair and different in phase by about 90 degrees from the first crank pin, a third crank pin interconnecting the pair of crank webs of the third crank web pair and different in phase by about 180 degrees from the second crank pin, and a fourth crank pin interconnecting the pair of crank webs of the fourth crank web pair and different in phase by about 180 degrees from the first crank pin;
- and
- a balancer shaft for reducing a primary couple of the crankshaft, the balancer shaft including a second gear engaged with the first gear,
- wherein the first gear is disposed at one axial end side of the first crank web pair.
2 more elements
A vehicle equipped with an engine,
- wherein the engine comprises:
- a crankshaft including first, second, third, and fourth crank web pairs each having a pair of crank webs and sequentially disposed from one axial end side of the crankshaft to the other axial end side thereof, a first crank pin interconnect the pair of crank webs of the first crank web pair, a second crank pin interconnecting the pair of crank webs of the second crank web pair and different in phase by about 90 degrees from the first crank pin, a third crank pin interconnecting the pair of crank webs of the third crank web pair and different in phase by about 180 degrees from the second crank pin, and a fourth crank pin interconnecting the pair of crank webs of the fourth crank web pair and different in phase by about 180 degrees from the first crank pin, wherein a gear is formed on an outer crank web of the pair of crank webs of the first crank web, the outer crank web being located at one axial end side of the crankshaft;
- and
- a balancer shaft for reducing a primary couple of the crankshaft, the balancer including a gear engaged with the outer crank web.
1 more element
Dependencies are inferred from the claim text.