Abstract: An axleless roller valve lifter for following an eccentric cam in an internal combustion engine includes a roller wheel contained and suspended within a wheel socket without the use of a center support axle. The inner contour of the wheel socket is precision machined to receive the outer diameter of the roller wheel, with a thin film of non-compressible oil providing a barrier between the roller and the well during operation. A permanent magnet within the body of the lifter assists in retaining the wheel within the well, and a check valve within the lifter body prevents oil from backflowing out of the lifter upon impact of the roller with the cam.

Abstract: A roller valve lifter apparatus for following an eccentric cam in an internal combustion engine includes a cylindrical roller, configured to roll upon the eccentric cam, and a lifter body, having a curved roller socket configured to retain the roller and to allow rotation of the roller in the roller socket upon a layer of lubricating fluid trapped between the roller surface and a bearing surface of the roller socket. In one embodiment the roller socket includes tapered end portions defining distal gaps between the roller surface and the bearing surface, for allowing entry of splash oil therebetween.