Valve train lubricating structure in internal combustion engine
First Claim
1. A valve train lubricating structure in an internal combustion engine, comprising:
- a supply feed pump and a return oil pump;
an oil pump shaft coaxially connected to an end of a crankshaft, the supply feed pump and the return oil pump being juxtaposed on the oil pump shaft;
a supply path for providing a route, through which a lubricating oil delivered from the oil pump is supplied to an oil gallery; and
a plurality of branch supply paths for providing routes, through which the lubricating oil is supplied to different parts of the internal combustion engine, one of the plurality of branch supply paths forming a supply path of the lubricating oil to the valve train;
wherein the supply path of the lubricating oil to the oil gallery includes a check valve and the supply path going to the valve train is branched off at a point upstream of the check valve,wherein the supply feed pump is adapted to supply the lubricating oil, and the return oil pump is adapted to return oil accumulated in a crankcase to a sump oil tank.
1 Assignment
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Accused Products
Abstract
To prevent a drop in a lubricating oil supply pressure in a valve train from occurring by disposing a lubricating oil supply path for the exclusive use of the valve train without allowing the lubricating oil to flow through an oil gallery, thereby securing a sufficient amount of supply of the lubricating oil in the valve train to enhance lubrication efficiency. A feed pump rotating with a crankshaft is disposed at a leftward end of the crankshaft. Lubricating oil supplied from the feed pump flows through an oil cooler and an oil filter. Part of the lubricating oil is supplied through a lubricating oil supply path to an oil gallery and to journals, crankpins, and the like of the crankshaft. The other part of the lubricating oil is supplied through lubricating oil supply paths for the exclusive use of the valve train.
10 Citations
22 Claims
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1. A valve train lubricating structure in an internal combustion engine, comprising:
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a supply feed pump and a return oil pump; an oil pump shaft coaxially connected to an end of a crankshaft, the supply feed pump and the return oil pump being juxtaposed on the oil pump shaft; a supply path for providing a route, through which a lubricating oil delivered from the oil pump is supplied to an oil gallery; and a plurality of branch supply paths for providing routes, through which the lubricating oil is supplied to different parts of the internal combustion engine, one of the plurality of branch supply paths forming a supply path of the lubricating oil to the valve train; wherein the supply path of the lubricating oil to the oil gallery includes a check valve and the supply path going to the valve train is branched off at a point upstream of the check valve, wherein the supply feed pump is adapted to supply the lubricating oil, and the return oil pump is adapted to return oil accumulated in a crankcase to a sump oil tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A valve train lubricating structure for an internal combustion engine, comprising:
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an oil pump and a generator mounted on one end of the crankshaft, and being rotated by the crankshaft; a supply path for supplying lubricating oil delivered from the oil pump to an oil gallery; and a plurality of branch supply paths for supplying the lubricating oil to predetermined parts of the internal combustion engine, one of the plurality of branch supply paths forming a supply path of the lubricating oil to the valve train; wherein the supply path of the lubricating oil to the oil gallery includes a check valve and the supply path for supplying lubricating oil to the valve train is branched off at a point upstream of the check valve, wherein the check valve is disposed in a portion of the supply path that is located beneath the generator. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification