Balancer shaft arrangement for engine
AssigneeYamaha Motor Co., Ltd.
InventorYoshiharu Nakayama
Life of this patent
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Abstract
An engine includes a balancer shaft that is supported at its both ends through bearings disposed within an engine crankcase. The balancer shaft lies generally parallel with a crankshaft and includes balancer weights, which are provided generally at the ends of the balancer shaft. At least one of the balancer weights is made up of first and second weight portions. The first and second weight portions are disposed on opposite sides of the corresponding bearing. In this manner, the bending moment on the shaft is reduced and, consequently, the balancer shaft can have a smaller diameter to reduce the size of the crankcase.
Claims17
An engine comprising:
- a balancer shaft being supported at its both ends through bearings by a crankcase and being disposed generally in parallel with a crankshaft, the balancer shaft having longitudinal ends;
- and
- a plurality of balancer weights with at least one balancer weight being disposed generally at each longitudinal end of the balancer shaft, at least one of the weights comprising first and second weight portions, the first and the second weight being disposed on opposite axial sides of the corresponding bearing along the length of the balancer shaft.
Dependencies are inferred from the claim text.