HYDRAULIC DEVICE FOR CONTROL OF AUTOMATIC TRANSMISSION

Japanese Patent JP3281171

B2

PURPOSE: To prevent any overrun phenonmenon during a deceleration time by providing a second hydraulic switching means alternately actuating high/low speed hydraulic clutches and being connected in parallel to a first hydraulic switching means wherein a plurality of advance hydraulic clutches are alternatively operated.
CONSTITUTION: A hydraulic device for control of an automatic transmission is provided with a plurality of advance hydraulic clutches 12-14 which respectively correspond to a plurality of transmission gear ratios in an advance direction, and high/low speed hydraulic clutches 15, 16 to switch each transmission gear ratio to two high/low speeds, and the hydraulic device controls each of hydraulic clutches 12-16 of the automatic transmission which is changeable by high speed transmission gear ratio subsequent to the plural low speed transmission gear ratios. The advance hydraulic clutch 14 for the maximum transmission gear ratio takes priority out of the plural advance hydraulic clutches 12-14 for transmission gear ratios so that the advance hydraulic clutches 12-14 are alternatively actuated by a first hydraulic switching part 1, and a high speed hydraulic clutch 15 and a low speed hydraulic clutch 16 are alternatively operated by a second hydraulic switching part 2 which is connected in parallel to the first hydraulic switching part.

Hiroshi Uemura

JP5767094A

May 13, 2002

March 28, 1994

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EXEDY Friction Material Co.,Ltd.

F16H61/18; F16D48/02; F16D48/06; F16H61/00; (IPC1-7): F16H61/18; F16H61/00

JP61103043A
JP341255A
JP3134369A
JP6152452A
JP53727U

Yukio Ono (1 person outside)

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