Hydraulic drive system

Details Hydraulic drive system Hydraulic drive system

1987-07-23

1988-09-27

Ostrager, Allen M.

Power plants

Pressure fluid source and motor

Having plural energy outputs

60698, 180305, 180308, F60K 1710, F60K 2500

Patent

active

047732199

ABSTRACT:
A hydraulic drive system utilizes four hydraulic motors arranged in mechanically coupled pairs with one motor from each pair always series hydraulically connected to one motor from the other pair. The other motors are selectively coupled parallel with each other or in series with the series connected motors. The combination of mechanical and hydraulic coupling provides an efficient drive system designed specifically for, but not limited to, the motor grader apparatus. The improved drive system herein disclosed provides both high speed-low power and low speed-high power operational modes and is capable of continuous operation in either mode. The improved drive system also provides superior control characteristics due to the hydraulic motor series lockup arrangement. The combination of mechanical and hydraulic coupling provides high power with good control or high speed with little heating of the hydraulic fluid.

REFERENCES:
patent: 3900075 (1975-08-01), Chichester et al.
patent: 4069886 (1978-01-01), Campbell et al.

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