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Double Row Differential Bearing DAC3572 Angular Contact Ball Bearing
CATEGORY：
Angular Contact Ball Bearings
Product Description
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Double Row Differential Bearing DAC3572 Angular Contact Ball Bearing
The differential gear is a device that converts the driving force from the transmission into even greater driving force and allows for different numbers of rotations for the left and right wheels.
The differential allows wheels on the same axle to rotate at different speeds. When your vehicle goes around a corner the wheel on the outside has to travel faster than the wheel on the inside. The differential allows this to happen. Two wheel drive vehicles have one axle and four wheel drive vehicles have two.
How are differential bearings lubricated?
The differential gears are lubricated by “differential gear oil” which is quite different from motor oil or transmission oil. It is typically a much thicker lubricant. The oil is transferred to the outer wheel bearings in many vehicles only by the splash effect of the spinning gear set.
What causes differential bearing failure?
The leading cause of a differential failing is due to using the wrong lubricant type and specialty lubricants. Water can also be a culprit to a differential failing as it can enter through the vent or seals. This often happens when driving in high water.
How do I know if my differential carrier bearing is bad?
The first sign of a bad carrier bearing is the howling noise it makes. It sounds similar to loud tire noise. It should be apparent to anybody riding in the cab because the drive shaft and carrier bearing run just under the thin floorboards. You may hear the howling only at certain speeds too.
Basic principles
Radio-controlled car manufacturers use the same basic design Schumacher created in the 1980s. The main part of the differential is a drive gear (or pulley in a belt transmission) with multiple holes cut through it, following its outside diameter. These holes are slightly larger than the width of the ball bearings, so that the balls, commonly around 2 mm diameter in a model car, sit inside the holes of the gear/pulley.
On either side of the gear are the thrust washers. The thrust washers are pushed against the ball bearings inside the gear by Belleville washers. On one side of the gear is an adjusting collar, which allows for adjustments in the amount of slip allowed by the differential.A thrust bearing (or thrust race), on the opposite side of the gear, is used to stop the differential from loosening the retaining screw holding the output cups, used to attach the differential to the axle, onto the differential.
As the screw is tightened it pushes the Belleville and thrust washers onto the gear/pulley. This creates contact between the washers and ball bearings inside of the gear/pulley. The friction created by the contact between the washers and ball bearings is, aided by grease (commonly silicone grease), designed so that as one washer moves, the ball bearings rotate.
As the washer on one side of the gear rotates, the rotation of the balls causes the other washer to rotate in the opposite direction, because any rotating ball will have opposite sides moving in opposite directions .
Differential movement is achieved through the process of the thrust washers rotating with the ball bearings. The retaining screw is designed so the differential can be easily adjusted by tightening or loosening the screw, consequently changing force. This makes the differential more adjustable than geared differentials, but there is a lower limit since the drive is by friction so there is always some limited slip action.
There are several types of balls used in this type of differential. Some of the most common ball materials used by high end racers are ceramic and tungsten based. The advantage to something like ceramic based balls is that they are much harder, and have a longer life expectancy. Oftentimes when using less hard materials, the balls will "flat spot" causing a semi locked direction of the ball. This causes the differential to not turn with a smooth feeling and leaves it with an overall "gritty" feeling.
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We specialize in providing forklift bearings, deep groove ball bearings, self-aligning ball bearings, self-aligning roller bearings, cylindrical roller bearings, tapered roller bearings, wheel hub bearings, agricultural machinery bearings, etc.
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