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| Illustration 1 | g06152375 |
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(1) Bevel Gear
(2) Spider (3) Differential Gear (4) Differential Case (5) Bevel Pinion | |
A differential divides the power that is sent to the wheels. Or, a differential causes a balance of the power that is sent to the wheels. A differential allows one wheel to turn at a slower rate than the other wheel on an axle. For example, this process occurs during a turn. During a turn, the differential allows the inside wheel to rotate at a slower rate in relation to the outside wheel. The differential still sends the same amount of torque to each wheel.
Straight Forward or Straight Reverse Operation
When the machine moves in a straight direction with the same amount of traction under each drive wheel, the same amount of torque on each axle holds the pinions. When the machine moves in a straight direction, the pinions do not turn on the spider.
Bevel pinion (5) turns bevel gear (1). Bevel gear (1) turns differential case (4). Differential case (4) turns spider (2). Spider (2) drives differential gear (3). Differential gear (3) does not turn on the spider. Differential gear (3) turns at the same speed as bevel gear (1) and case (4). Differential gear (3) turns bevel pinion (5). The same amount of torque is sent through the final drives to each wheel.
This operation provides the same effect as having both drive wheels on the same axle shaft.
Operation during a Forward Turn or Operation during a Reverse Turn
When the machine is in a turn, the outside wheel turns faster than the inside wheel.
Bevel pinion (5) turns bevel gear (1). Bevel gear (1) turns case (4). Case (4) turns spider (2). Spider (2) drives differential gear (3). Differential gear (3) turns bevel pinion (5). Because the outside wheel turns faster than the inside wheel, the outside differential gear (3) turn the inside differential gear (3) on spider (2). As the pinions turn, the pinions move around the side gears. This operation allows the outside wheel to turn faster than the inside wheel.
The same amount of torque is sent through the final drives to both the inside wheels and to the outside wheels. This torque is only equal to the amount of torque that is necessary to turn the outside wheel.
Loss of Traction (Wheel Slippage)
When one wheel has more traction than the other wheel, the operation of the differential is identical to the operation of the differential during a turn. The same amount of torque is sent to both wheels. This torque is only equal to the amount of torque that is necessary to turn the wheel with the least resistance.