Structure of internal combustion engine
This patent describes a structure of internal combustion engine, comprising a cylinder member formed with a cylinder which demarcates a combustion chamber in cooperation with a piston connected with a crankshaft, a crankcase provided in succession with the lower end of the cylinder member to accommodate the crankshaft, a valve actuating mechanism actuating valves provided in the combustion chamber in response to rotation of the crankshaft, at least a part of the valve actuating mechanism being accommodated in a rocker case provided on the upper end of the cylinder member, an oil return passage constituting means opening at one end into the rocker case, the other end being open into the crankcase at one side which is partitioned by a plane containing the cylinder axis of the cylinder member and the axis of the crankshaft and is occupied by a crank pin of the crankshaft when the piston rises, thereby constituting a passage for leading oil in the rocker case into the crankcase, and a restraining means provided in relation to the oil return passage constituting means so that an air flow around the axis of the crankshaft within the crankcase owing to the rotation of the crankshaft is restrained from entering into the passage through the opening of the other end.
- Assignee:
- Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4771745
- OSTI ID:
- 6888784
- Country of Publication:
- United States
- Language:
- English
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