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US 3,967,612 AGranted
Lubricating oil pump for use in an internal combustion engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorSeiichiro Yamada
Life of this patent
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Abstract
A lubricating oil pump which is responsive to the engine load to supply an associated internal combustion engine with an optimum quantity of lubricating oil. The lubricating oil pump determines the oil outlet frequency depending on the engine speed and determines the supply quantity of oil depending on the variation in the engine pressure.
Claims11
In combination with an internal combustion engine having a crank chamber, a lubricating oil pump comprising:
- a casing having a first cavity defined therein;
- a distributor coupled to said internal combustion engine, said distributor being rotatably disposed within said first cavity of said casing, and having an axial cavity defined in said distributor;
- pump means for drawing oil within a second cavity defined in part by said distributor and by said pump means, and for forcing oil from at least part of said second cavity, said pump means being disposed in said axial cavity of said distributor;
- reciprocating means for imparting a reciprocating force to said pump means, said reciprocating means disposed within said first cavity of said cavity, said reciprocating means, casing and distributor defining a gas chamber;
- passage means extending between the crank chamber of the engine and said gas chamber for communicating variations in magnitude of the crank chamber pressure to said gas chamber, said distributor selectively controlling communication of said passage means with said gas chamber;
- and
- one-way valve means disposed in said passage means for controlling the flow of gas within said passage means.
4 more elements
A lubricating oil pump according to claim, 2 wherein:
- said pump means is connected to said reciprocating means so that the lubricating oil is sucked into said second cavity when the distributor is communicating the first passage with the gas chamber;
- said casing is provided with a first air port to permit said distributor to selectively communicate the gas chamber with the atmosphere;
- the distributor selectively communicates the gas chamber with the first passage, second passage and first air port, in this order;
- and said reciprocating means is elastically urged toward a preselected equilibrium position by means of an elastic member disposed within said axial cavity of said casing.
1 more element
Dependencies are inferred from the claim text.