Patent ID: 7204219

Claim:
A valve gear comprising: a camshaft having a first valve gear cam and a second valve gear cam; first and second rocker shafts arranged such that the camshaft is disposed between the first and second rocker shafts; a first rocker arm swingably supported on the first rocker shaft and having a roller bearing at one end thereof, the roller bearing of the first rocker arm being arranged to contact with the first valve gear cam; and a second rocker arm swingably supported on the second rocker shaft and having a roller bearing at one end thereof, the roller bearing of the second rocker arm being arranged to contact with the second valve gear cam; wherein the first and second valve gear cams of the camshaft, respectively, include a base circle and a cam nose projecting from the base circle, and the first rocker arm and the first valve gear cam are arranged such that when the roller bearing of the first rocker arm contacts with the base circle of the first valve gear cam, the first rocker shaft is located closer to the camshaft than a location of a center of rotation of the roller bearing of the first rocker arm.