Hydraulic machine comprising dual gerotors

Details Hydraulic machine comprising dual gerotors Hydraulic machine comprising dual gerotors

1999-01-13

2001-03-06

Vrablik, John J. (Department: 3748)

Power plants

Pressure fluid source and motor

Having distinct cooling or lubricating structure

C123S041120, C417S326000, C417S405000, C418S171000

Reexamination Certificate

active

06195990

ABSTRACT:

The invention concerns a dual-rotor gerotor machine. All rotors are placed in a single plane. This arrangement succeeds in placing the gerotors in a housing of small axial length, yet causing them to provide a large displacement of hydraulic fluid per revolution. This arrangement provides large horsepower in a small package.
BACKGROUND OF THE INVENTION
FIG. 1
illustrates a hydraulic machine
2
of the gerotor type, found in the prior art. A shaft (not shown) engages splines
9
, and rotates rotor
6
. The machine
2
can operate either as a pump or motor, but since operation as a pump is perhaps easier to understand, the explanation will be framed in terms of a pump. Plates such as plate
18
in
FIG. 7
seal the chambers
3
and
12
in
FIG. 2
, which are described below.
In
FIG. 2
, rotor
6
rotates about center CA, as indicated by the arrow pointing to that center. Rotor R rotates about center CB, as indicated by the arrow. The distance between centers CA and CB is defined as the “eccentricity” of the two rotors.
FIGS. 3-6
illustrate these two rotations.
FIG. 3
illustrates the starting position. Dots D
1
and D
2
have been added for reference. In
FIG. 4
, rotor
6
has been rotated counter-clockwise by the shaft (not shown) through about 20 degrees. The other rotor R is carried along, but not through a full 20 degrees (because the tooth ratio between the rotors is 6/7). Chamber CH
1
has been reduced in volume, thereby causing fluid to become expelled through conduits which are not shown.
In
FIG. 5
, rotor
6
has been further rotated another 20 degrees counter-clockwise. Rotor R is again carried along, but not the full 20 degrees, and chamber CH
1
is further reduced in volume.
In
FIG. 6
, rotor
6
has been further rotated another 20 degrees, for a total of 60 degrees, compared with FIG.
3
. Rotor R is carried along, but, again, not by the full 20 degrees. Now a visible separation SEP between dots D
1
and D
2
begins to appear, indicating the lag of rotor R behind rotor
6
. Chamber CH
1
is almost compressed to zero volume.
When the machine operates as a motor, the opposite sequence occurs: pressurized fluid delivered to chambers such as CH
1
forces the chambers to expand, thereby inducing rotation of both rotors
6
and R about their respective centers CA and CB.
OBJECTS OF THE INVENTION
An object of the invention is to provide an improved hydraulic machine.
A further object of the invention is to provide a dual gerotor hydraulic machine in which all gerotors occupy a single plane.
SUMMARY OF THE INVENTION
In one form of the invention, a first gerotor set is coplanar with a second gerotor set, and the second set surrounds the first.


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