GEARING

**Definition:** This place covers:

Gearings for conveying rotary motion:

Combination of gearings.

General details of gearings.

Control of gearings.

**Glossary:** - gearing: mechanical, hydraulic, electric or other means for transmitting mechanical motion or force - gearbox: housing of the gearing - toothed gearing: includes worm gearing and other gearing involving at least one wheel or sector provided with teeth or the equivalent, except gearing with chains or toothed belts, which is treated as friction gearing - conveying motion: includes transmitting energy, and means that the applied and resultant motions are of the same kind, though they may differ in, e.g. speed, direction or extent - rotary motion: implies that the motion may continue indefinitely - oscillating motion: moving about an axis to an extent which is limited by the construction of the gearing and which may exceed one revolution, the movement being alternately forwards and backwards during continued operation of the gearing - reciprocating motion: moving substantially in a straight line, the movement being alternately forwards and backwards during continued operation of the gearing - reversing or reversal: applied movement in one direction may produce a resultant movement in either of two opposed directions at will. Note: When reversing reciprocating motion, input rotary motion (which is defined as indefinitely continuous rotary motion) would cause an automatic reversal of the reciprocating motion. If the input rotational direction is changed in order to cause reversal of the reciprocating motion, the input motion is an oscillating motion (which is defined as alternately forward and backward rotary motion) - central gears: includes any gears whose axis is the main axis of the gearing, e.g. sun or ring gear - Ravigneaux set: a planetary gear set with at least three central gears, and conveying rotary motion between axially-spaced orbital gears. It comprises a long orbital gear consisting of two axially spaced orbital gears which are fixedly connected to each other. It comprises a further orbital gear which meshes with one of the orbital gears of the long orbital gear to form a pair of intermeshing orbital gears. All orbital gears are mounted on a common planet carrier and are considered as a single set of orbital gears. - creeping: the vehicle has come to a stop, the engine is at idle (i.e., there is no request by the operator for a higher engine speed/torque), but due to the rotation of various transmission components, the vehicle starts to move, and the vehicle operator has some control over movement with a brake - inching: the vehicle operator has some control, besides using a brake, over moving the vehicle by small degrees