| 摘要 |
PURPOSE:To contrive reducing vibration of an engine and making a balancer into light-weight and compact size in such a way that it provides a balancer shaft which revolves in the inverse direction to a crankshaft, and provides balancers in three places of said shaft corresponding to the first-third cylinders, and then those which are located on the both outside are made to serve also as bearings. CONSTITUTION:Crank arms of a crankshaft 1 for the first and third cylinders are provided with the counter-weights 6a-1, 6a-2; 6c-1, 6c-2, and 6a'-1, 6a'-2; 6c'-1, 6c'-2 to the mass at the revolving parts and reciprocating parts of the engine. Besides, a crank arm for the second cylinder is provided with the counter-weights 6b-1, 6b-2 to only the mass of the revolving parts. Further, one balancer shaft 7 is installed for revolving in the inverse direction at the same speed as the crankshaft 1 for those which have been mentioned the above, the balancers 8a, 8c are installed in the zones of said shaft 7 corresponding to the bearings 9a, 9d of the first and third cylinders, and a balancer 8b is installed in the zone corresponding to the second cylinder respectively. Then, the balancers 8a, 8c are supported in a full-circumferential shape of shaft pipe, and they are used also as bearings 23. |
