Automatic transmission

Details Automatic transmission Automatic transmission

2005-03-01

2005-03-01

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

C060S483000

Reexamination Certificate

active

06860104

ABSTRACT:
Automatic transmission, comprising at least one primary hydraulic pump (1) arranged to be powered by a motor, said primary pump (1) being arranged to power a number of at least two secondary hydraulic pumps (21-2n) which are mechanically connected to an outgoing propeller shaft (6), the secondary hydraulic pumps being arranged for active powering of said outgoing propeller shaft when the hydraulic pressure caused by the primary pump in a closed room (A) between the primary pump and the secondary pumps, reaches predetermined levels which are different for the various secondary pumps (21, 22and . . .2nrespectively). Each of the secondary hydraulic pumps (21-2n) is preferably closed by means of a mechanical spring resistance from a coil spring (213-2n3) against a valve (212-2n2) which abuts a valve seat, until the pressure from the primary pump (1) gets sufficiently high to overcome the resistance from said coil spring, the secondary hydraulic pumps (21-2n) having individually adapted springs (213-2n3) which open at mutually different pressures.

REFERENCES:
patent: 2370526 (1945-02-01), Doran
patent: 3123975 (1964-03-01), Ebert
patent: 3190075 (1965-06-01), Ebert
patent: 5012644 (1991-05-01), Yoshida

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