Neutral flow by-pass valve for hydrostatic transmission

Details Neutral flow by-pass valve for hydrostatic transmission Neutral flow by-pass valve for hydrostatic transmission

1996-12-24

1998-09-22

Richter, Sheldon

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

60468, 91497, F16D 3102

Patent

active

058097813

ABSTRACT:
A neutral by-pass for hydraulic fluid in a hydrostatic transmission is provided by an essentially closed conduit comprising a pair of bores and a channel communicating the pair of bores, all formed in the cam ring of the transmission. When the neutral point is attained, the bores will be communicated with oil dampening pistons in communication with the hydraulic fluid supply passages and the fluid pressure between the passages will be equalized. This will operate from either the forward or reverse direction. As the cam ring is angularly moved, essentially closed conduit is moved away from the dampening pistons, so there can be no fluid flow therethrough. When this occurs, all fluid flow goes to the motor rotor, causing output rotation.

REFERENCES:
patent: 3020890 (1962-02-01), Grad
patent: 4091717 (1978-05-01), Bojas et al.
patent: 4896506 (1990-01-01), Shivvers et al.
patent: 4968227 (1990-11-01), Szulczewski et al.

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