Patent ID: 8051821
Filing Date: 2011-11-08
Classification: F01L,F16C,Y10T

Abstract:
1. A camshaft apparatus comprising: a shaft case; a camshaft surrounded by the shaft case so as not to contact with the shaft case; a pulley attached to the camshaft; a plurality of cams which are aligned on an outer circumferential surface of the camshaft at predetermined intervals in an axial direction to define inter-cam outer circumferential surface areas on the outer circumferential surface between the adjacent cams; a single main ball bearing which includes an inner ring fixed to the outer circumferential surface of the camshaft and including a groove-shaped raceway surface, an outer ring fixed to an inner circumferential surface of the shaft case and including a groove-shaped raceway surface, and balls which are disposed so as to fit in groove-shaped raceway surfaces of the inner and outer rings; and a plurality of roller bearings which are disposed in at least part of the inter-cam outer circumferential surface areas, wherein each of the roller bearings includes an outer ring fitted in the inner circumferential surface of the shaft case and including a raceway surface, and rollers disposed so as to be in contact with the raceway surface and a corresponding inter-cam outer circumferential surface area, wherein the main ball bearing is provided on the camshaft in a position between the pulley and a cam of the plurality of cams which is situated closest to the pulley.