Hydraulic control system for continuously variable traction roll

Details Hydraulic control system for continuously variable traction roll Hydraulic control system for continuously variable traction roll

1991-03-25

1992-08-11

Herrmann, Allan D.

Machine element or mechanism

Mechanical movements

Grip units and features

74200, F16H 1500

Patent

active

051368900

ABSTRACT:
A hydraulic control system for a continuously variable traction roller transmission comprises a shift control valve for controlling hydraulic pressure within a hydraulic cylinder apparatus. The shift control valve includes a sleeve and a spool received therein for relative motion, which assume a normal state when a gear ratio commanded corresponds to a rotational displacement of rotation shanks of roller support members wherein the hydraulic cylinder apparatus provides a predetermined force to the rotation shanks in an axial direction thereof so as to preserve a rotational displacement of the rotation shanks. The sleeve has a plurality of bores for discharging hydraulic fluid to be supplied to the hydraulic cylinder apparatus. The bores are fluidly communicated when a relative displacement between the sleeve and the spool with regard to the normal state is greater than a predetermined value, whereas the bores fail to be fluidly communicated when the relative displacement is smaller than the predetermined value.

REFERENCES:
patent: 3327545 (1967-06-01), Petty
patent: 4297918 (1981-11-01), Perry
patent: 4484487 (1984-11-01), Kraus
patent: 4718294 (1988-01-01), Okoshi
patent: 4830578 (1989-05-01), Kraus
patent: 4960004 (1990-10-01), Hibi et al.
Patent Abstract of Japan vol. 10, No. 307 (M-527)(2363) Oct. 18, 1986, of JA-A-61 119 866 (Daihatsu) Jun. 7, 1986.

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