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Патент USA US3058437

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Oct. 16, 1962
_
3,058,427
A. c. MAMO ETAL
ROTARY PUMP
Filed March 27, 1961
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United States Patent O " ICC
3,58AZ7
Patented Ojct. 16, 1962
l
pair of bores 32 and 33 extending through the casing 10.
3,058,427
The bores 32 and 33 are eccentrically positioned with
RGTARY PUMP
Anthony C. Mama, Des Plaines, and Boleslaw Pietraszew
respect to the cylindrical cavity 15. A shaft 34 is keyed
within the bore 31 by a key 35 and journaled within the
pair of bores 31 and 32 whereby the rotor 16 is mounted
eccentrically within the cavity 15.
ski, Chicago, lll., assignors to Borg-Warner Corpora
tion, Chicago, Ill., a corporation of Illinois
Filed Mar. 27, 1961, Ser. No. 98,483
6 Claims. (Cl. 1433-136)
The peripheral wall 13 is provided with a bore 36
extending at right angles through a face 37 of the periph
eral wall 13 and of a depth less than the width of the
.This invention relates to a positive-displacement
hydraulic pump and more particularly to a pump of this 10 cylindrical cavity 15 and positioned medially with respect
thereto. The location of the bore 36 is such that it cuts
type comprising a cylindrical casing having a cylindrical
through an inner peripheral face 33 of the peripheral
wall 13 thereby providing an opening 39 in communica
tion with the cylindrical cavity 15 and a pair of lands
40 and '41 on opposite sides of the opening 39 whereby
rotor mounted eccentrically therein which is provided
with but one vane having a sealing roller at the end
thereof.
It is an important object of this invention to provide
an improved pump of this type wherein the rotor is
provided with an intake cavity on one side thereof and
an outlet cavity on the other side thereof.
the roller 26 may ride on the lands 411 and 41 as it moves
It is another object of this invention to provide a rotor
area for the insertion of a flat spring 43 for urging a
20 sealing roller 44, carried in the bore 36, into sealing
having one vane with a roller at the end thereof in seal
across the opening 39. A space 42 is provided in the
bore 36 opposite the opening 39 thereby providing an
ing engagement with the inner periphery of the casing
and another roller in the casing extending through the
inner periphery thereof in sealing engagement with the
engagement with the outer periphery 45 of the rotor 16.
The casing 10 is also provided with a small bore 46
extending through the inner peripheral face 38 into com
rotor.
munication with the bore 36 thereby providing admission
It is also an object of this invention to provide a pump 25 of hydraulic lluid into the bore 36 which provides pres
sure as an additional means for urging the sealing roller
of this type which is economical to manufacture.
This invention consists of the novel constructions,
arrangements and devices to be hereinafter described and
44 inwardly.
The side Wall 17 has a suction intake port 47 there
through in communication with the suction inlet cavity
claimed for carrying out the above stated objects and
such other objects as will appear from the following 30 20 and the side wall 1S has a pressure outlet port '48 in
communication with the pressure outlet cavity 21. The
description of a preferred form of the invention, illus
suction inlet cavity 20 is provided with an outlet port
trated with reference to the accompanying drawings,
49 in communication with a iluid working space 50 which
wherein:
comprises the space between the outer periphery 45 of
FIG. 1 is a cross sectional view taken on line 1--1 of
FIG. 2 of a pump constructed according to this invention; 35 the rotor 16 and the inner peripheral `face 38 of the
peripheral wall 13. The pressure outlet cavity 21 is
FIG. 2 is a view taken on line 2-2 in the direction as
provided with an inlet port 51 which is also in communi
shown in FIG. l; and
cation with the iluid working space 50.
FIG. 3 is a view taken on line 3-3 in the direction as
In operation, when the system is ñlled with ñuid and
shown in FIG. l.
Like characters of reference designate like parts in the 40 the vane 25 is retracted at the bottom or radial innermost
position of its stroke, the suction intake port 47 and the
several views.
pressure outlet port 48 are momentarily closed by the
Referring now to FIG. l, a cylindrical casing 10 is
thickened wall portion 22 which has a greater axial width
shown, which comprises a main portion 11 and a cover
than the diameters of ports 47 and 4S. As the vane 25
plate 12. The main portion 11 has a peripheral wall
13. Bolts 14 are provided for attaching the cover plate 45 moves slightly beyond this point in a clockwise direction,
12 to the main portion 11 thereby providing a cylindrical
both ports 47 and 48 begin to open and the fluid in the
cavity 15 within the cylindrical casing 1i?. A cylindrical
lluid working space 56 is driven ahead of the vane through
rotor 16 is positioned within the cylindrical cavity 15
the inlet port 51 into the pressure outlet cavity 21 and
and is of a width to provide adequate tolerance for rota
thence through the pressure outlet port 48 as indicated
tive movement between side walls 17 and 18 of the cavity 50 by the arrows 52 in FIG. 2 and at the same time hydrau
15 and yet of adequate width to minimize fluid loss.
lic ñuid is being sucked into the Huid working space 56
The cylindrical rotor 16 has a Vmedial wall 19 thereby
by way of suction intake port 47, suction inlet cavity
providing a suction inlet cavity 2@ on one side thereof
20 and outlet port 49 as indicated by arrows 53 as shown
and a pressure outlet cavity 21 on the other side thereof
in FIG. 3.
which are of appreciable volumetric capacity. The wall 55
19 has a thickened wall portion 22 of a width equal to
that of the rotor 16 and extends outwardly to the perim
eter 23 of the rotor 16 and inwardly beyond the center
It will be apparent that when the pump is in operation,
the suction inlet cavity 20 and the pressure outlet cavity
21 are always ñlled with fluid, as also is the fluid work
ing space 50. Fluid loss is kept to a minimum by pro
thereof. The thickened wall portion 22 is provided with
viding close tolerances between the sides of the cylin
a rectangular recess 24 extending radially from a point 60 drical rotor 16 including the sides of the vane 25 and the
short of the center of the rotor 16 and through its outer
side Walls 17 and 18 of the cavity 15. Effective sealing
perimeter 23. A vane 25 is slideably mounted within the
against iluid loss between the end of the vane 25 and the
recess 23 and carries a roller 26 of a length equal to
inner peripheral face 38 of the peripheral wall 13 is pro
the width of the rotor 16, within a cylindrical bore 27
vided by the roller 26 biased thereagainst by the spring
which passes through the outer end of the arm 25 and 65 29, and the sealing roller 44 being biased against the outer
at a right angle with respect to the rotor 16. The loca
periphery 45 of the rotor 16, is eñective in sealing against
tion of the bore 27 is such that it cuts through an outer
iluid loss between the outer periphery 45 of the rotor 16
end face 28 of the arm 25 thereby permitting the roller
and the inner peripheral face 38 ofthe peripheral wall 13.
26 to protrude therethrough. A spring 29 is biased be
It is apparent from the above description of the opera
tween the arm 25 and an inner wall 3i) of the recess 24. 70 tion of the pump, according to this invention, and the
The rotor 16 is provided with a bore 31 extending
drawings that when the vane 25 is at the bottom of its
concentrically therethrough in coaxial alignment with a
stroke, the iiuid working space 50 is completely filled and
3,058,427
3
4
as the vane 25 is moved in a clockwise direction by the
rotation of the rotor 16, all the fluid from the fluid work
ing space 50 is removed when the vane 25 again arrives
at the bottom of its stroke and that in the meantimethe
4. A rotary pump comprising a casing having a pe
ripheral wall and iirst and second side walls thereby pro
viding a cylindrical cavity therein, said peripheral wall
having a bore laterally therethrough which cuts through
iìuid working space 50 has again been iilled whereby with Ul the inner periphery of said peripheral wall thereby pro
each revolution a full charge of fluid is delivered by the
viding an opening in communication with said cylindrical
pump.
cavity, a sealing roller in said bore, a spring interposed
We wish it to be understood that our invention is not
between said sealing roller and said peripheral wall, a
to be limited to the specific constructions and arrange
cylindrical rotor mounted eccentrically within said
ments shown and described except only insofar as the ap 10 cylindrical cavity by‘means of a.v shaft tixed concentrically
pended claims may be so limited, as it will be apparent
in said rotor and journaled in the said side walls of said
to those skilled in the art that changes may be made with
casing thereby providing a huid working space between
out departing from the principles of the invention.
the outer periphery of the said rotor and the inner periph
We claim:
ery of said peripheral wall said rotor having a iirst cavity
l. A rotary pump comprising a casing having a periph
in said first side thereof and a second cavity ‘in said sec
eral wall and first and second side walls thereby providing
ond side thereof, an intake port in said iirst side wall in
a cylindrical cavity therein, a cylindrical rotor having ñrst
communication with said iirst cavity, an outlet port in said
and second sides mounted eccentrically within said cylin
second side wall in communication with said second cavity,
drical cavity by means of a shaft íiXed concentrically in
a iirst port in said first cavity in communication with said
said rotor and journaled in the said side Walls of the said
ñuid working space, a second port in said second cavity
in communication with said Huid working space, said rotor
the outer periphery of the said rotor and the inner periph
hav-ing a radial recess, a vane slideably mounted in said
ery of said peripheral wall, said rotor having a iirst cavity
rotor recess, and a spring interposed between said vane
in said first side thereof and a second cavity in said second
and said rotor urging said vane outwardly.
side thereof, an intake port in said iirst side wall in com 25
5. A rotary pump according to claim 4 wherein the
munication with said first cavity, an outlet port in said
said bore is of a depth less than the Width of the said
second side wall in communication with said second cavity,
cylindrical cavity and positioned medially with respect
a ñrst port in said ñrst cavity in communication with said
thereto the said cylindrical cavity thereby providing a
fluid working space, a second port in said second cavity
pair of lands atv each end of the said opening.
in communication with said fluid working space, said rotor 30
6. A rotary pump according to claim 4 including a sec
casing thereby providing a fluid working space between
having a radial recess, a vane deñning means slideably
mounted in said rotor recess, and a spring interposed be
tween said rotor and said vane, urging said vane radially
outwardly.
2. A rotary pump according to claim 1 wherein the
said vane carries a sealing roller in a bore that cuts through
the end of the said vane at its most radially outward end
whereby the said roller contacts the said innerîperiphery
of said peripheral wall in sealing engagement.
3. A rotary pump according to claim l wherein said 40
rotor is provided With a medial wall between said first
and second cavities said medial wall having a thickened
portion extending from the said outer periphery of Vsaid
rotor and radially inwardly beyond the center thereof and
of a width equal to the width of said rotor, said thickened 45
portion having a recess, the saidvane being slideably
mounted therein, said vane having a >width equal to the
width of said rotor and the said thickenedportion being
of a width greater than the diameters of the said inlet 50
and outlet ports,
ond bore adjacent the said bore and extending through
the said inner periphery of said peripheral Wall in com
munication with said bore.
References Cited in the tile of this patent
UNÍTED STATES PATENTS
234,957
674,837
727,749
749,712
865,117
1,359,792
2,818,025
Chamberlin ___________ __ Nov. 30,
Gadberry ____________ __ May 21,
Cook ________________ __ May 12,
Allen ________________ __ Jan. 19,
Muhl _________________ __ Sept. 3,
Cracknell ____________ __ Nov. 23,
Hein ________________ __ Dec. 31,
1880
1901
1903
1904
1907
1920
1957
FOREIGN PATENTS
227,885
421,374
Great Britain _________ __ Jan. 26, 1925
Germany _____________ __ Nov. 11, 1925
523,391
France _______________„__ Apr. _21, 1921
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