#
CENTRIFUGAL BALANCE CLUTCH DESCRIPTION [JA5A-EL]

BME051719500T05

## Function

• The centrifugal balance clutch, which replaces the conventional piston check ball, cancels centrifugal oil pressure generated during clutch drum rotation to prevent the clutch drag-engagement and to stabilize piston pressure during full rotation.

## Construction/Operation

• Centrifugal balance clutch chambers are installed opposite the clutch chambers in the low and high clutches. The centrifugal balance clutch chambers are constantly filled with ATF from the exclusive hydraulic passage of the oil pump.

### When the clutch pressure is not applied

  • When the clutch drum rotates, centrifugal force acts on the residual ATF in the clutch chamber to push against the piston. However, centrifugal force also acts on the ATF filled in the centrifugal balance clutch chamber to push back the piston. As a result, the two forces are eliminated and the piston remains stationary, thus preventing clutch engagement.

### When the clutch pressure is applied

  • When clutch pressure is applied to the clutch chamber, the clutch pressure overcomes the oil pressure and the spring force in the opposite centrifugal balance clutch chamber, and pushes the piston to engage the clutches. Because the centrifugal force acting on the clutch pressure in the clutch chamber is canceled by another centrifugal force acting on the ATF filled in the centrifugal balance clutch chamber, the influence of the centrifugal force created by the clutch drum revolution speed is eliminated. As a result, stable piston pushing force is obtained in all rotation ranges, and smoother shifts can be made.