Glossary “roller clutch” Definition:
A one-way clutch containing a number of rollers that operate by wedging on a ramp between an inner and outer race to lock up (drive) when the outer race is turned in one direction, and to slip (overrun) when it is turned in the opposite direction.

Glossary “roller hydraulic lifter” Definition:
Lifters with rollers placed at the base to limit lifter/cam friction.

Glossary “roller lifter” Definition:
A valve lifter, featuring a roller which contacts the camshaft to reduce friction.

Glossary “roller tappet” Definition:
Valve lifter or tappet with a roller that rides on the camshaft lobe. Either solid or hydraulic lifters can be roller tappets.

Glossary “roller cam” Definition:
Camshaft having a small roller at the base of each lifter.

Glossary “roller chain” Definition:
A timing chain having rollers that engage the gear sprockets.

Glossary “roller bearing” Definition:
Bearing using rollers within an outer race or ring.