Four-cycle engine

Details Four-cycle engine Four-cycle engine

2005-04-12

2005-04-12

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090310

Reexamination Certificate

active

06877467

ABSTRACT:
An engine includes an engine body that defines first and second banks arranged in a V-shape. A crankshaft extends within the engine body. First and second camshafts extend within the first bank, and third and fourth camshafts extend within the second bank. The first, second, third and fourth camshafts are generally disposed parallel to each other and parallel to the crankshaft. The first and third camshafts are placed next to each other. A first flexible transmitter surrounds the crankshaft and the first and third camshafts. The crankshaft drives the first and third camshafts through the first transmitter. A second flexible transmitter surrounds the second and fourth camshafts and either the first or third camshaft. The first or third camshaft drives the second and fourth camshafts through the second transmitter. The engine also includes VVT mechanisms to change an angular position of the camshafts relative to the crankshaft. The VVT mechanisms are disposed at the camshafts. Each VVT mechanism at least in part overlaps with either the first or second transmitter in a direction of an axis of the associated camshaft.

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Co-pending patent application: U.S. Appl. No. 09/358,992 filed Jul. 22, 1999; entitled Four Stroke Engine for Outboard Motor; in the name of Yutaka Okamoto; and assigned to Sanshin Kogyo Kabushiki Kaisha.

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