US 5,850,736 A · Hydrostatic Transmission

Abstract

A hydrostatic transmission constructed so that a check valve and a relief valve are made as compact as possible to supply oil to a closed circuit for connecting a hydraulic pump and a hydraulic motor, and to regulate maximum pressure in the closed circuit. A check valve and a relief valve are contained in a valve casing. A valve body of the relief valve is disposed opposite to a valve body of the check valve. A relief spring of the relief valve is retained by a cover detachably mounted to an open end of the valve casing, thereby facilitating pressure setting of the relief valve. The valve body of the relief valve is contained in a relief valve casing slidably disposed in the valve casing. A plunger, capable of urging the check valve in the opening direction via the relief valve casing, is provided in the cover, thereby enabling the check valve to be manually opened.

Claims20

Dependent claims

A hydrostatic transmission, comprising:

a hydraulic motor;
a hydraulic pump;
and
a closed circuit having a low pressure side and a high pressure side for connecting said hydraulic pump and said hydraulic motor in fluid communication with each other, wherein said closed circuit includes,
a valve casing,
a check valve disposed within said valve casing, wherein said check valve allows oil to be supplied only to the low pressure side of said closed circuit,
a relief valve disposed opposite to said check valve within said valve casing, wherein said relief valve regulates oil pressure within said closed circuit, and
a cover detachably mounted to an end of said valve casing.

5 more elements

Dependencies are inferred from the claim text.

Hydrostatic Transmission

Life of this patent

Hydrostatic Transmission

Life of this patent

Abstract

Claims20