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               LEGACY (W2260BE_SGML Complete)



                                 MECHANISM AND FUNCTION                                             [M3B0]        3-4
                                                                                   3. Limited Slip Differential (LSD)


3. Limited Slip Differential (LSD)
A: OUTLINE
The limited slip differential is of a viscous coupling (V/C) type in which the differntial torque distribu-
tion to the left and right wheels is automatically limited to enhance the driving stability when a rota-
tion speed differnce between the left and right wheels occurs during driving on a slippery road
(muddy, snow-covered or slushy road) or cornering.

B: STRUCTURE
This V/C type LSD has outer plates and inner plates incorporated one after the other between the
differential case and side gear (LH). The former is spline-coupled to the inside of the differential
case at its outer periphery and the latter is spline-coupled to the outer circumference of the side
gear (LH) at its inner periphery.
The inner plates are held in position by spacer rings while the outer rings slide in the axial direction
along the spline.
The space between the differential case and side gear (LH) is filled with a mixture of high viscosity
silicone oil and air and hermetically sealed with X-ring.




                                                                                                          S3H0174B


     (1) Spacer ring                                       (6) Pinion gear
     (2) Inner plate                                       (7) Side gear (RH)
     (3) Outer plate                                       (8) Differential case
     (4) X-ring                                            (9) Side gear (LH)
     (5) Pinion shaft                                     (10) X-ring




                                                    5
                          LEGACY (W2260BE_SGML Complete)



3-4      [M3C1]                      MECHANISM AND FUNCTION
3. Limited Slip Differential (LSD)


C: OPERATION
1. WHEN RIGHT AND LEFT WHEELS TURN AT EQUAL SPEED.
During normal straight-road driving where the right and left wheels run at an equal speed, the dif-
ferential case and side gears rotate together, just as in conventional differentials. As a result, driv-
ing torque is transmitted equally to the right and left side gears.




                                                                                                S3H0175




                                                    6
              LEGACY (W2260BE_SGML Complete)



                                 MECHANISM AND FUNCTION                                       [M3C2]        3-4
                                                                             3. Limited Slip Differential (LSD)


2. WHEN RIGHT AND LEFT WHEELS TURN AT DIFFERENT SPEEDS.
When a speed difference occurs between the right and left wheels, the differential case and V/C
side gear (LH) turn relatively at the same speed difference as that between the rear dirve shaft.
Because of the shearing force caused in the silicon oil, a differential torque is generated, which
controls differential operation (idle rotation). For example, if the left wheel turns idle due to a differ-
ence in the road resistance, a speed difference occurs between the right and left wheels. Since
the V/C is installed between the right and left wheels, a differential torque is generated in the V/C
corresponding to this speed difference, and this differential torque is transferred from the left
wheel to the right wheel. Accordingly, a greater driving force is transferred to the right wheel which
is rotating at a lower speed.
When the right wheel turns idle (spins), the differential torque is transferred from the right wheel
to the left wheel. That is, also in this case, a greater driving force corresponding to the differntial
torque is transmitted to the wheel having a lower rotating speed.




                                                                                                    S3H0176A




                                                    7
                          LEGACY (W2260BE_SGML Complete)



3-4      [M3D0]                      MECHANISM AND FUNCTION
3. Limited Slip Differential (LSD)




                                                                        S3H0177A


D: SERVICE PROCEDURES FOR LSD
The component parts of LSD assembly are not available as piece parts.
Therefore, it is recommended to not disassemble LSD assembly.




                                                    8

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