HYDRAULIC CIRCUIT FOR INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Jan 28, 2015
filing date -
Jan 31, 2014
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Abstract
In a hydraulic circuit including a second oil pump (21) as a dedicated pump for supplying oil pressure to a VVT (23, 24), the exhaust side VVT (24) has a rotor and a return spring for holding the rotor in a most advance angle state in stoppage of an engine. By obtaining driving force of the second oil pump (21) from an exhaust side camshaft (26) to which the rotor is connected, it is possible to reduce an increase in a torque required for operating the exhaust side VVT (24) through energizing force of the return spring.
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