Variable valve gear for internal combustion engine
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorsHitoshi Toda, Masayuki Takagaki, Shinichi Murata
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Abstract
Disclosed is a variable valve gear comprising a camshaft phase change mechanism, which variably controls a phase of an intake cam with respect to a crankshaft, and a variable valve lift mechanism, which changes an opening timing of an intake valve more than a closing timing and basically continuously varies a lift and an open period of the intake valve. The lift and the open period are set lest the intake valve interfere with a piston of an engine, with the phase controlled to be most advanced by the camshaft phase change mechanism and the lift controlled to be maximal by the variable valve lift mechanism.
Claims5
A variable valve gear for an internal combustion engine, comprising:
- a camshaft phase change mechanism which variably controls a phase of an intake cam of the internal combustion engine with respect to a crankshaft;
- a variable valve lift mechanism which changes an opening timing of an intake valve more than a closing timing and basically continuously varies a lift and an open period of the intake valve;
- wherein the camshaft phase change mechanism is provided with,
- a housing,
- a vane rotor rotatably attached to the housing and attached to an intake camshaft,
- holding means configured to limit rotation of the vane rotor with respect to the housing to hold the phase of the intake cam on the advance side, and
- an urging unit that urges the vane rotor in the advance side, and
- wherein the lift and the open period of the intake valve are set lest the lift at a top dead center interfere with a piston trajectory at the top dead center with the phase controlled to be most advanced by the camshaft phase change mechanism and the lift controlled to be maximal by the variable valve lift mechanism.
Dependencies are inferred from the claim text.