Fuel supply device for internal combustion engine
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United States of America Patent
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-
Aug 18, 2015
Grant Date -
Jan 30, 2014
app pub date -
Jul 3, 2013
filing date -
Jul 30, 2012
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A fuel supply device supplies fuel from a fuel tank to an injector by driving a diaphragm pump by use of pressure variation within a crankcase. The diaphragm pump includes: a pump casing; a diaphragm partitioning the interior of the pump casing into a negative pressure chamber and a pump chamber; and a plunger connected to the diaphragm and reciprocatively movable to and from the pump chamber. A pressure receiving area over which the plunger receives, at its end surface in a plunger advancing/retracting direction, pressure from the pump chamber is set smaller than a pressure receiving area over which the diaphragm receives pressure from the negative pressure chamber in the advancing/retracting direction.
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