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US 7,254,945 B1Granted
Operate check valve and hydraulic driving unit
AssigneeKayaba Industry Co., Ltd.
InventorsYoshitake Sakai, Osamu Sato
Life of this patent
Estimating the term…
Abstract
An operate check valve saves space and performs multiple functions by absorbing and integrating a switching valve. A switching valve for controlling the flow of a hydraulic fluid in both normal and reverse directions is coaxially contained with a check valve in a space inside a valve containing housing between a hydraulic pump and a tank for storing the hydraulic fluid. Check valves are located opposite one another on either side of the switching valve, with the switching valve integrated into the operate check valve.
Claims8
An operate check valve comprising:
- a switching valve having first and second valving regions and a central valving region located between said first and second valving regions;
- a first check valve movable between closed and open configurations;
- and
- a second check valve movable between closed and open configurations;
- wherein said switching valve is operable in a first configuration in which a first side fluid conduit of said switching valve is in fluid communication through the first valving region with a first check valve fluid conduit through the open first check valve, and a second side fluid conduit of said switching valve is in fluid communication with a central fluid conduit of said switching valve through the switching valve's central valving region;
- wherein said switching valve is operable in a second configuration in which the second side fluid conduit of said switching valve is in fluid communication through the second valving region with a second check valve fluid conduit through the open second check valve, and the first side fluid conduit of said switching valve is in fluid communication with the central fluid conduit of said switching valve through the switching valve's central valving region;
- and
- wherein structure on the switching valve is configured to bear on structure of the first and second check valves to urge the first and second check valves from their closed to open configurations.
5 more elements
A hydraulic drive assembly comprising:
- a hydraulic pump operable to pump fluid in first and second directions, wherein when pumping in the first direction fluid is pumped from a first side of said pump, and wherein when pumping in the second direction fluid is pumped from a second side of said pump;
- a hydraulic actuator configured to receive fluid at first and second sides of said actuator;
- a tank configured to store a supply of the fluid;
- and
- an operate check valve comprising:
- a switching valve having first and second valving regions and a central valving region located between said first and second valving regions;
- a first check valve movable between closed and open configurations;
- and
- a second check valve movable between closed and open configurations;
- wherein said switching valve is operable in a first configuration in which the first side of said pump and the first side of said hydraulic actuator are in fluid communication through the switching valve's first valving region, and the second side of said pump and said tank are in fluid communication through the switching valve's central valving region;
- and
- wherein said switching valve is operable in a second configuration in which the second side of said pump and the second side of said hydraulic actuator are in fluid communication through the switching valve's second valving region, and the first side of said pump and said tank are in fluid communication through the switching valve's central valving region;
- and
- wherein structure on the switching valve is configured to bear on structure of the first and second check valves to urge the first and second check valves from their closed to open configurations.
11 more elements
Dependencies are inferred from the claim text.