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A pinion is a round gear—usually the smaller of two meshed gears—used in several applications, including drivetrain and rack and pinion systems. Applications
A rack and pinion has roughly the same purpose as a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.
Shaft angle. A shaft angle is the angle between the axes of two non-parallel gear shafts. In a pair of crossed helical gears, the shaft angle lies between the oppositely rotating portions of two shafts. This applies also in the case of worm gearing. In bevel gears, the shaft angle is the sum of the two
A spur-gear differential has an equal-sized spur gears at each end, each of which is connected to an output shaft. [8] The input torque (i.e. from the engine or transmission) is applied to the differential via the rotating carrier. [8] Pinion pairs are located within the carrier and rotate freely on pins supported by the carrier.
The pinion then rotates enough to allow the gears to mesh, after which the pinion then continues along the shaft to reach a stop on the end of its allowed travel, at which point the gears are fully meshed. Since the pinion gear can no longer travel axially, it must then turn with the drive shaft and begins to drive the ring gear.
The pinion is supported both in front of and behind the pinion teeth, [7] an arrangement often referred to as "straddle mounting." Straddle mounting greatly reduces pinion deflection under high torque loads, conferring increased longevity and torque capacity. The pinion is also removable from the back as well, making for easier access.
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Naturally the cast housing is also unique to the IRS model. Standard 8.5" Dana 44 ring and pinion gear can be used in the IRS model through the use of an installation kit which includes special shouldered bolts to mount the standard ring gear to the IRS carrier and a special pinion bearing set to fit the standard pinion shaft to the IRS housing.
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