Transmission ratio control system for a continuously variable tr

Details Transmission ratio control system for a continuously variable tr Transmission ratio control system for a continuously variable tr

1987-08-14

1989-07-04

Braun, Leslie A.

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

74866, F16H 4114

Patent

active

048439134

ABSTRACT:
A control system for a continuously variable transmission for a motor vehicle has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The transmission ratio control valve has chambers at both ends of the spool. By controlling flow rate of oil supplied to the chambers in accordance with a desired transmission ratio, the spool is shifted, so that the transmission ratio changing rate is controlled. The transmission ratio changing rate is reduced at cold engine so as to prevent decrease of the vehicle speed at acceleration.

REFERENCES:
patent: 4565110 (1986-01-01), Ito
patent: 4566354 (1986-01-01), Kumura et al.
patent: 4663991 (1987-05-01), Nakamura et al.
patent: 4713987 (1987-12-01), Matsumura
patent: 4736301 (1988-04-01), Osanai

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