Patent ID: 7762918

Claim:
A modified automatic transmission comprising: a main pump; a band servo; bands actuated by the band servo; a drum selectively grasped and released by the bands to shift the automatic transmission; an automatic transmission fluid flow under pressure pumped by the main pump; an accumulator comprising; a first accumulator chamber inside the accumulator; and a second accumulator chamber inside the accumulator and separated from the first accumulator chamber and dividing the interior of the accumulator into two mutually exclusive opposing volumes; a first passage in fluid communication with the first chamber; and a second passage in fluid communication with the second chamber; a control valve body including: a shift valve; a first fluid path carrying the automatic transmission fluid flow from the main pump to the shift valve; a first controlled automatic transmission fluid flow controlled by the shift valve; in-series second fluid path and third fluid path carrying the first controlled automatic transmission fluid flow from the shift valve to the band servo; a fourth fluid path in-series with the second fluid path and the first passage and carrying the first controlled automatic transmission fluid flow from the shift valve to the first accumulator chamber; a second valve; a fifth fluid path carrying the automatic transmission fluid flow from the main pump to the second valve; a second controlled automatic transmission fluid flow controlled by the second valve; and a sixth fluid path in fluid communication with the second passage and carrying the second controlled automatic transmission fluid flow from the second valve to the second accumulator chamber; an accumulator orifice plate residing between the accumulator and the control valve body and including: a first orifice aligned with the first passage and having a first small cross-section to restrict the flow of the first controlled automatic transmission fluid into the first chamber; and a second orifice aligned with the second passage and having a second small cross-section to restrict the flow of the second controlled automatic transmission fluid into the second chamber.