| 摘要 |
A balancing device for a reciprocating engine is provided which is improved so as not to disturb the compactification of an engine. There is provided a balancing device for a reciprocating engine comprising two balance shafts 10L, 10R gear connected to each other, a chain/sprocket mechanism 9, 11, 12 for coupling at least one 10L of the balance shafts with a crankshaft 1 in an interlocking fashion, a chain tensioner 14 for automatically adjusting the tension of the chain 12 and a pump receiving portion 22 integrally provided in a balance shaft holder 16 for supporting the balance shafts for receiving a rotor 21B of a lubricating oil pump 21, the balancing device being characterized in that the rotor of the lubricating oil pump is directly connected to the other balance shaft 10R, and that the chain tensioner is disposed on an shaft end side of the other balance shaft. In accordance with the balancing device constructed as described above, the chain tensioner can be displaced within a range that does not project largely from a triangular contour formed by the two balance shafts and the crankshaft.
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