DIFFERENTIAL SYSTEM

Rear Differential

1. A FD21C or FD23A type rear differential is used.

   
   

   • FD21C type rear differential

   
   

   • A pre-torque mechanism is used for the differential to improve the initial acceleration performance of the vehicle on slippery road surfaces.

     Figure 2. FD21C Type Rear Differential

     

     *a

     Pre-torque mechanism

     -

     -

   
   

   • FD23A type rear differential

   
   

   • A ring gear that is 230 mm (9.1 in.) in diameter is used to support the high-torque powertrain.

   • A highly efficient radial ball bearing is used for the rear drive pinion shaft. In addition, the shape of the fluid path in the differential carrier is optimized to reduce the amount of fluid. As a result, torque loss is reduced, achieving improved fuel economy.

   • The thickness of the differential carrier is reduced and a rear drive pinion with a hollow structure is used, achieving weight reduction.

   • A pre-torque mechanism is used for the differential to improve the initial acceleration performance of the vehicle on slippery road surfaces.

     Figure 3. FD23A Type Rear Differential

     

     *1	Radial Ball Bearing (Rear Drive Pinion Bearing)	*2	Rear Drive Pinion
     *3	Ring Gear	-	-
     *a	Pre-torque Mechanism	*b	Hollow Structure

Pre-torque Mechanism

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 the left and right wheels can be achieved by friction produced by the sliding parts within the range of the conical spring force.

   

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

Rear Differential Support

1. A dual dampening construction, in which the differential is mounted on the suspension member via rubber mounts, is used.

2. The rear differential is supported on the suspension member at 3 points: 2 at the front and 1 at the rear.

3. A rear differential dynamic damper is used. The damper absorbs vibrations to achieve noise reduction.

   

   *A	Models with FD23A Rear Differential	*B	Models with FD21C Rear Differential
   *1	Rear Differential Dynamic Damper	-	-
   *a	A - A Cross Section	*b	B - B Cross Section
   *c	C - C Cross Section	-	-
   	Rubber	-	-