Electro-hydraulic gear shifting control for vehicle gears

Details Electro-hydraulic gear shifting control for vehicle gears Electro-hydraulic gear shifting control for vehicle gears

1974-02-27

1976-05-25

Wyche, Benjamin W.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

137115, B60K 4104

Patent

active

039584666

ABSTRACT:
Hydraulic gear shift controllers to effect change of transmission gearing are controlled by means of a spool valve having a slider spool located in the bore of a housing, preferably axially aligned with a pressure limiting spool valve. A kick-down hydraulic control line is rapidly activated by an electrical controller which admits pressurized fluid to an end face of the spool, communication of the kickdown pressure control line with the main pressure controller being effected through a blind bore of the main slider spool, and cross bores formed therein to provide rapid control in dependence on electrical signals representative of an engine operating parameter, such as engine speed, or throttle position, and to apply a bias pressure on the slider spool.

REFERENCES:
patent: 3225619 (1965-12-01), Schaefer
patent: 3656496 (1972-04-01), Uenoyama et al.
patent: 3727487 (1973-04-01), Forster et al.

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