Jatco Corporation

Yoshihiro Kono

Takeo Hiramatsu

Seiichiro Takahashi

Yoshiaki Katou

Yasushi Yabe

Jonggap Kim

A double piston and belt type continuously variable transmission comprises a primary pulley provided with a primary piston chamber and a primary clamp chamber; a secondary pulley provided with a secondary piston chamber and a secondary clamp chamber; and an endless belt operatively put around the primary and secondary pulleys. A switching circuit is arranged to connect both the primary and secondary clamp chambers to either one of the primary and secondary piston chambers, which shows a higher hydraulic pressure than the other.

Double piston and belt type continuously variable transmission

A gear change control system of a belt-type continuously variable transmission includes: a movable pulley piston chamber for causing a thrust force to a movable pulley varying a groove width of primary pulley and secondary pulley. The movable pulley piston chamber has double-piston constitution including: a primary clamp chamber and a secondary clamp chamber, for causing a clamp force of clamping the belt, and a cylinder chamber including a primary pulley cylinder chamber and a secondary pulley cylinder chamber, for causing a differential thrust force at a gear change. A clamp chamber oil pressure setting section sets up a clamp chamber oil pressure by the following calculation: dividing the one of the primary thrust force and the secondary thrust force by addition of: applied pressure area of one of the primary clamp chamber and the secondary clamp chamber, and applied pressure area of the cylinder chamber on a selected side.

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Shizuoka, Japan

Yoshihiro Kono