Control of belt-type continuously variable transmission

Details Control of belt-type continuously variable transmission Control of belt-type continuously variable transmission

2007-11-06

2007-11-06

Charles, Marcus (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

C474S018000

Reexamination Certificate

active

10828459

ABSTRACT:
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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