US 6,519,939 B1Granted

Hydraulic system, manifold and volumetric compensator

AssigneeM-Mac Actuators, Inc.

InventorMichael Alexander Duff

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Abstract

A hydraulic system manifold having a body, a counterbalancer in the body and a flow controller in the body is disclosed. The body has first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduits in communication with the first and second pump ports, the counterbalancer and the flow controller. The counterbalancer is in communication with the first and second supply conduits and the cylinder ports, to communicate hydraulic fluid between the first and second supply conduits and the first and second cylinder ports while counterbalancing hydraulic fluid pressure in the first and second supply conduits. The flow controller is in communication with the first and second supply conduits and the compensator ports, to control the flow of hydraulic fluid between the compensator ports and the first and second supply conduits to supply and store hydraulic fluid in a volumetric compensator in communication with the compensator ports.

Claims17

Dependent claims

A hydraulic system manifold comprising:

a) a body having first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduits therein, the first and second supply conduits being in communication with said first and second pump ports;
b) a counterbalancer in the body and in communication with said first and second supply conduits and said cylinder ports, to communicate hydraulic fluid between said first and second supply conduits and said first and second cylinder ports while counterbalancing hydraulic fluid pressure in said first and second supply conduits, said counterbalancer comprising:
i) first and second cross piloted valves to permit fluid to flow from said first cylinder port to said first supply conduit and from said second cylinder port to said second supply conduit respectively;
and
ii) first and second check valves in communication with said first and second cross piloted valves to permit fluid to flow in directions opposite to that of said first and second cross piloted valves respectively;
and
c) a flow controller in the body and in communication with said first and second supply conduits and said compensator ports, to control the flow of hydraulic fluid between said compensator ports and said first and second supply conduits to supply and store hydraulic fluid in a volumetric compensator in communication with said first and second compensator ports, further comprising a volumetric compensator mount for removably mounting said volumetric compensator in communication with said first and second compensator ports.

4 more elements

A hydraulic system comprising:

a) a body having first and second pump ports, first and second cylinder ports, first and second compensator ports and first and second supply conduits therein, the first and second supply conduits being in communication with said first and second pump ports;
b) a counterbalancer in the body and in communication with said first and second supply conduits and said cylinder ports, to communicate hydraulic fluid between said first and second supply conduits and said first and second cylinder ports while counterbalancing hydraulic fluid pressure in said first and second supply conduits;
c) a flow controller in the body and in communication with said first and second supply conduits and said compensator ports, to control the flow of hydraulic fluid between said compensator ports and said first and second supply conduits to supply and store hydraulic fluid in a volumetric compensator in communication with said first and second compensator ports;
and
d) said volumetric compensator in communication with said first and second compensator ports, said volumetric compensator comprising:
i) a housing having an opening for communicating with said first and second compensator ports to receive and expel hydraulic fluid;
ii) a flexible diaphragm member defining an expandable volume within said housing and in communication with said opening to receive hydraulic fluid therein;
and
iii) a counterforce provider, for providing a counterforce on said flexible diaphragm member, tending to reduce said expandable volume.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/619,083Filed 17 Jul 2000
Granted: 18 Feb 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

F15B 11/0445
By means in the return line: with counterbalance valves, e.g. to prevent overrunning or for braking
F15B 15/202
Other details , e.g. assembly with regulating devices: externally-operated valves mounted in or on the actuator
F15B 1/02
Installations or systems with accumulators; Supply reservoir or sump assemblies: installations or systems with accumulators
F15B 1/024
Installations or systems with accumulators: used as a supplementary power source, e.g. to store energy in idle periods to balance pump load