Four-stroke cycle internal-combustion engine

CAFC
  • US 5,269,270 A
  • Filed: 03/06/1992
  • Issued: 12/14/1993
  • Est. Priority Date: 03/20/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A four-stroke cycle internal-combustion engine having at least one large and at least one small-diameter intake valves and at least one large and at least one small-diameter exhaust valves in each cylinder, said small diameter valves being disposed in a first portion of a cylinder head wherein an average distance from a piston at top dead center (TDC) to the first portion of the cylinder head is greater than an average distance from the piston at TDC to a second portion of the cylinder head wherein are disposed the large diameter valves, said larger-diameter intake and exhaust valves being designed to rest in accordance with the operating condition of said engine, in which on either of the intake and exhaust valve sides in mounted a valve-opening mechanism comprising a first valve-operating cam of a narrow total valve-opening angle and a low lift, a second valve-opening cam of a wide total valve-opening angle and a high lift, a rocker arm for said small-diameter valve in direct contact with said first valve-opening cam, a rocker arm for said large diameter valve, and a connecting means capable of simultaneously operatively connecting said second valve-opening cam with said rocker arm for said small-diameter valve and said rocker arm for said large-diameter valve.

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