Balancing device for reciprocating engine

Details Balancing device for reciprocating engine Balancing device for reciprocating engine

1999-08-10

2001-02-20

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Vibration compensating device

Balancing arrangement

C123S1960CP

Reexamination Certificate

active

06189499

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a balancing device for a reciprocating engine.
2. Description of the Prior Art
An engine becomes known in, for instance, a Japanese Patent Unexamined Publication (Kokai) No. Hei.9-210135 which is constructed such that balance shafts each provided with counterweights for canceling a secondary vibromotive force generated by a piston are provided so as to extend below a crankshaft and that the rotation of the crankshaft is transmitted to the balance shafts via a chain/sprocket mechanism.
In a conventional engine with a balancing device like this, it is constructed such that the rotation of a crankshaft is transmitted to sprockets provided individually on a rotor of a lubricating oil pump and one of the balance shafts via a common chain.
On the other hand, in the chain/sprocket mechanism, a chain tensioner is inevitable for automatically adjusting the tension of the chain. In a construction as described above, however, in which the sprockets for the crankshaft, balance shaft and lubricating oil bump are disposed in a triangular arrangement, the chain tensioner has to be disposed to project sideward, and this hinders the engine from being compactified.
SUMMARY OF THE INVENTION
The present invention was made to solve the problem inherent in the prior art, and an object thereof is to provide a balancing device for a reciprocating engine that is improved without hindering the compactification of an engine.
In order to attain the above object, there is provided in accordance with the present invention a balancing device for a reciprocating engine comprising two balance shafts intermeshed with each other, a chain/sprocket mechanism for coupling at least one of the balance shafts with a crankshaft in an interlocking fashion, a chain tensioner for automatically adjusting the tension of the chain and a pump receiving portion integrally provided in a balance shaft holder for supporting the balance shafts for receiving a rotor (for instance, an outer or inner rotor described in an embodiment of the present invention) of a lubricating oil pump, the balancing device being characterized in that the rotor (for instance, the inner rotor described in the embodiment) of the lubricating oil pump is directly connected to the other balance shaft, 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 disposed 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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