Accumulator: Description and Operation

ACCUMULATORS-1-2
The 1-2 accumulator reduces shift shock when shifting from first to second gear. The accumulator piston is normally pressed to the right by line pressure. When there is a shift from first to second gear, the 2-4 band engagement pressure pushes the accumulator piston slowly to the left. As a result, the 2-4 band engagement pressure builds up slowly, reducing the shift shock when there is a shift from first to second gear.

ACCUMULATORS-2-3
Thy 2-3 accumulator reduces shift shock when shifting from second to third gear. The accumulator piston is normally pressed to the left by line pressure. When there is a shift from second to third gear, 3-4 clutch engagement pressure pushes the accumulator piston slowly to the right. As a result, the 3-4 clutch engagement pressure builds up slowly, reducing the shift shock when there is a shift from second to third gear.

ACCUMULATORS-N-D
The NEUTRAL-DRIVE(N-D) accumulator moderates a rapid increase in hydraulic pressure during forward clutch engagement. This reduces shift shock when the D range is selected from NEUTRAL. In the NEUTRAL position, line pressure is constantly applied to the right side of the accumulator piston, pushing it to the left. When the D range is selected from NEUTRAL, line pressure which engages the forward clutch, is applied to the left side of the N-D accumulator by the manual valve. As a result, the combination of line pressure and spring force overcome the line pressure on the right, moving the accumulator piston gradually to the right. This movement of the piston moderates a rapid increase in line pressure.

ACCUMULATORS-N-R
The NEUTRAL-REVERSE(N-R) accumulator reduces shift shock when shifting from NEUTRAL to the REVERSE range (R). The accumulator piston is normally pressed to the left by spring force and line pressure. When there is a shift from NEUTRAL to REVERSE, the accumulator piston is pushed slowly to the right by the reverse clutch pressure. As a result, the reverse clutch pressure builds up slowly, reducing the shift shock when there is a shift to REVERSE.