Four wheel drive transmission

Details Four wheel drive transmission Four wheel drive transmission

1975-03-12

1976-11-02

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74645, 74682, 74731, 74869, 180 70R, B60K 4118

Patent

active

039889513

ABSTRACT:
A four wheel drive automatic transmission assembly having an input driving a fluid torque converter which is connected to drive through a three forward speed and reverse drive planetary front transmission to drive the front wheels and through a low forward speed and reverse drive rear transmission to drive the rear wheels. The rear transmission has the same components for the low forward and reverse drives as the front transmission has for the same drives. The control system has a manual control providing in neutral position a positive neutral in both transmissions, in drive position an automatic speed and torque demand control of the three forward speeds of the front transmission with a one-way first and second speed and a two-way third speed drive and positive neutral in the rear transmission, in intermediate position two-way second speed drive and at very low speeds a downshift to one-way first speed of the front transmission and positive neutral in the rear transmission, in low position two-way drive in the first speed of the front transmission and one-way drive in the first speed of the rear transmission and in reverse position two-way reverse in the front transmission and two-way reverse in the rear transmission. This provides normal front wheel automatic drive in drive and intermediate positions and four wheel drive, two-way to the front wheels and one-way to the rear wheels, in low position and two-way four wheel drive in reverse. In modifications first speed four wheel drive, one-way to both the front and rear wheels is also provided in intermediate range and in both intermediate and drive ranges.

REFERENCES:
patent: 3039327 (1962-06-01), Breting
patent: 3804191 (1974-04-01), Golan et al.
patent: 3822765 (1974-07-01), Heller et al.

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