Saturday, 20 April 2024, 6:56 AM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
R
Ram PressurePressure caused by air of fluid movement. |
RangeThe difference between the highest and lowest numbers. |
Range Change(1) High and low gear ratios for an off-road or sport utility vehicle. (2) Secondary gearing in a large goods vehicle transmission gearbox that couples with the primary gears to double or treble the overall gear ratios. |
Rare earth magnetsThese magnets are made from substances which hold a more dense magnetic flux than regular magnets. This means more power for the weight. Rare earth magnets are always preferable although not necessary as they can be expensive. |
RatchetA mechanism consisting of a toothed wheel, the ratchet, and a locking or actuating pawl. Used to either prevent the pawl lever or the wheel from rotating in one direct only or in some mechanisms to drive the wheel forward. |
RatioThe numerical relationship between two or more components transmitting a force or movement. |
Ravigneaux Planetary GearsAn epicyclic gear set with two sun wheels and planetary gears on a common annulus. |
Re-faceTerm used to describe the action when the face of a valve or other component is machined. |
ReactTo respond. |
ReactionAn equal and opposite force. |