Glossary “drop” Definition:
To lower a structural part of a vehicle.
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drop center rim
Glossary “drop center rim” Definition:
A wheel that has a smaller diameter center section, to facilitate tire replacement, designed to prevent the tubeless tire from rolling off the rim when the tire blows out.
drop center safety rim
Glossary “drop center safety rim” Definition:
A wheel rim with a low center area and raised flanges designed to prevent the tire from accidentally coming off the rim.
DRL
Glossary “DRL” Definition:
Daytime Running Lights
drone
Glossary “drone” Definition:
Sustained tone at a higher pitch than boom.
driveshaft phase
Glossary “driveshaft phase” Definition:
When trunnions of the front and rear u-joints are in the same plane (parallel).
drivetrain
Glossary “drivetrain” Definition:
All of the components required to deliver engine power to the road surface. All power transmitting components from the engine to the wheels, including the clutch or torque converter, the transaxle, the driveline, and the drive axle.
driving axle
Glossary “driving axle” Definition:
An axle capable of transmitting power by way of a differential or other transmission arrangement. Also a term used for drive axle.
driving lamps
Glossary “driving lamps” Definition:
Auxiliary lights to provide additional illumination for high-speed driving.
driving lights
Glossary “driving lights” Definition:
Term used for driving lamps.
driven plate
Glossary “driven plate” Definition:
Friction plate in a clutch assembly.
driver
Glossary “driver” Definition:
1). The operator of a vehicle. 2). An electronic switch (transistor) used to open and close the ground circuit of verious output devices.
driver-reaction distance
Glossary “driver-reaction distance” Definition:
The distance traveled between the point at which the driver perceives a need to brake and the actual start of brake application.
driveshaft
Glossary “driveshaft” Definition:
Hollow metal tube that has universal joints at each end.
driven disk
Glossary “driven disk” Definition:
Friction disk of a clutch.
driven gear
Glossary “driven gear” Definition:
The gear that receives the driving action from the drive gear.
driven pinion
Glossary “driven pinion” Definition:
A rotating shaft in the differential that transmits torque to another gear.
driven pinion gear
Glossary “driven pinion gear” Definition:
One of the two main driving gears to multiply engine torque located within the transaxle or rear-driving axle housing.
driveline wrap-up
Glossary “driveline wrap-up” Definition:
A condition in which axles, gears, U-joints, and other components can bind or fail if 4WD mode is used on dry pavement.
driveline windup
Glossary “driveline windup” Definition:
A reaction that takes place as a result of the transfer of engine torque through the rear-wheel driveline.