Hydrostatic transmission with hydraulic bypass and air bleed

Details Hydrostatic transmission with hydraulic bypass and air bleed Hydrostatic transmission with hydraulic bypass and air bleed

1989-03-24

1991-04-30

Look, Edward K.

Power plants

Pressure fluid source and motor

With means purging, cleaning or separating undesirables from...

60464, 60489, 60494, F16D 3102

Patent

active

050107330

ABSTRACT:
A hydrostatic transmission having a housing with a sump and a pair of hydraulic displacement units interconnected by first and second fluid passages. A pair of bypass valves can be opened to place said first and second fluid passages in fluid communication. A recess, formed in the lower part of the housing, holds make-up oil and communicates with said first and second fluid passages when the bypass valves are opened. A passage extends upwardly from the housing recess and has its upper end normally sealed by seal means. A manually operable bypass rod extends lengthwise of the passage into the area of the housing recess and has structure associated therewith for causing opening of the bypass valves. The seal means is in the form of a washer fastened to the bypass rod whereby upward movement of the bypass rod to open the bypass valves moves the washer away from the upper end of the passage whereby air bubbles that have collected in the upper part of the passage during a bypass operation can rise out of the passage and escape into the upper part of the housing.

REFERENCES:
patent: 4856264 (1989-08-01), Nishimura et al.
patent: 4891943 (1990-01-01), Okada
patent: 4893524 (1990-01-01), Ohashi et al.
patent: 4899541 (1990-02-01), Okada et al.
patent: 4903545 (1990-02-01), Louis et al.
patent: 4905472 (1990-03-01), Okada
patent: 4914907 (1990-04-01), Okada
patent: 4922787 (1990-05-01), Fujisaka et al.
patent: 4932209 (1990-06-01), Okada et al.

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