DIFFERENTIAL SYSTEM


  1. CONSTRUCTION


    1. A high-efficient tapered roller bearing is used for the rear differential drive pinion bearing to reduce friction loss, thus improving fuel consumption.

      Figure 1. FD21C Type Rear Differential

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      *1 Rear Differential Drive Pinion *2 High-efficient Tapered Roller Bearing
      *3 Ring Gear - -
      *a Lightweight Carrier *b Pre-torque Mechanism

      Figure 2. FD21CT Type Rear Differential

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      *1 Rear Differential Drive Pinion *2 Ring Gear
      *3 TORSEN Limited Slip Differential (LSD) *4 High-efficiency Tapered Roller Bearing
      *a Lightweight Carrier - -

    2. Pre-torque Mechanism (Models with FD21C Type Rear Differential)


      1. The pre-torque mechanism consists of a construction in which a conical spring is provided between the side gear and the side gear washer, and a preload is applied between the side gear washer and the side gear. Because of this, when the load and speed differential are low, the balance limit between left and right wheels can be achieved by friction produced by the sliding parts within the range of the conical spring force.

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        *1 Pinion Gear Washer *2 Side Gear
        *3 Conical Spring *4 Side Gear Washer

    3. TORSEN LSD (Models with FD21CT Type Rear Differential)


      1. The TORSEN LSD consists of a differential case, 10 planetary gears, 2 side gears and 3 washers. The planetary gears are engaged in pairs, and each pair of planetary gears is engaged with one of the side gears. The planetary gears are supported by the holes provided in the differential case and structured to rotate while revolving around the side gear.

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        *1 Shim *2 Side Washer
        *3 Side Gear LH *4 Axle Spacer
        *5 Washer *6 Side Gear RH
        *7 Differential Case Housing *8 Planetary Gear LH
        *9 Planetary Gear RH *10 Differential Case Cap

      2. The TORSEN LSD conducts differential limiting using friction force generated mainly between the planetary gear and differential case and between the side gear and washer when a velocity difference occurs between the left and right wheels. The friction force is proportional to the differential input torque and is generated by the reaction force between the planetary gear and side gear.

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