Control system for shifting a drive transmission

Details Control system for shifting a drive transmission Control system for shifting a drive transmission

1974-03-18

1976-03-02

Wyche, Benjamin W.

Machine element or mechanism

Gearing

Interchangeably locked

74346, 192 357, 192 4A, 192 12C, F16D 6700, G01K 100

Patent

active

039410072

ABSTRACT:
Pneumatically operated devices respond to movement of a shift lever by decoupling change speed gears from both the input and output of a transmission and then brake the gears to a stop, shift gear engagements as necessary, release the brakes and re-engage the input and output clutches to re-establish drive at a newly selected drive ratio. A self-cycling control circuit is connected between the shift lever and pneumatic devices to actuate and deactuate such devices as necessary to accomplish a selected shift. The circuit includes means which enables re-engagement of the input and output clutches only after critical gear couplings and decouplings are established together with means which cycles the gears to facilitate engagements and disengagements if these have not occurred in a predetermined time. Means are also provided for preconditioning the system to respond quickly to a subsequent shift lever movement.

REFERENCES:
patent: 3508450 (1970-04-01), Richards
patent: 3570636 (1971-03-01), Franz et al.
patent: 3667309 (1972-06-01), Franz et al.

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