Hydraulic control unit for automatic transmission available in vehicle provided with internal-combustion engine carrying supercharger

Abstract

Abstract PURPOSE:To aim at reducing a gearshift shock down to the smallest possible extent, by making the oil pressure fed to a back pressure chamber of an accumulator rise in proportion to an increase in supercharging pressure for an internal-combustion engine. CONSTITUTION:A spool 75 is driven on the basis of a balanced relationship between the downward force given by accumulator controlling oil pressure Pa to be led into an oil chamber 82 inside from a port 81 and the upward force given by a compression coil 83 and throttle controlling oil pressure Pt. A plunger rod 71 is driven upward with an increase in the supercharging pressure of a boost device 67, while an accumulator oil pressure control valve 37 increases the accumulator controlling oil pressure Pa produced at an outlet port 78.

Inventors

• 👤 Hideki Yasue
• 👤 秀樹 安江
• 👤 Kagenori Fukumura
• 👤 福村　景範

Bibliographic Details