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Патент USA US3036536

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May 29, 1962
Filed Oct. 20, 1960
21* F'
22 2o 24
United States Patent ()?ice
Edwin F. Peterson, % Martin Engineering Co.,
Neponset, Ill.
Filed Get. 20, 1960, Ser. No. 63,808
8 Claims. (‘CL 103—-136)
' Patented May 29, 1962
is ?ush with the radial surface as aforesaid. In one form
of the invention, the port is so arranged that a portion of
the annular wall overlaps a segment of the port so that
the inner face of the closure element abuts the overlap
ping portion. In another form of the invention, the port
has at an external portion thereof a counterbore forming
an annular recess in which seats an annular shoulder on
This invention relates to a rotary device, typical of
the closure element. In both cases, removable securing
which are ?uid pumps, motors, etc., and more particular
means are provided for accurately positioning and hold
ly to improvements residing in the provision of an access
port for inspection and/ or removal of internal parts such 10 ing the closure element in place. In one form of the in
vention, the securing means includes biasing means for
as impeller members, vanes and the like.
holding the closure member in its normal position with
A conventional device, motor or pump of the general
the abutment means in cooperative relationship. In both
character referred to is normally constructed in such man
ner as to have a rotor housing including an internal rotor
forms of the invention, the removable means includes an
chamber, the housing having an annular wall and a pair 15 end plate which also provides access to the bearing for
the shaft in the proximate side wall.
of opposite radial side walls respectively presenting an
The foregoing and other important objects and desira
internal circumferential surface and a pair of radial sur~
ble features inherent in and encompassed by the invention
faces de?ning the chamber. A rotor within the chamber
will become apparent as preferred embodiments of the
is mounted on a shaft for rotation on an axis normal to
the radial surfaces and such rotor will carry one or more 20 invention are described by way of example in the ensuing
vanes or equivalent in power members adapted to travel
description and accompanying sheet of drawings, the ?g
in such manner that their respective end edges operate
ures of which are described below.
in contact with the interior chamber surfaces. These sur
faces and the respective edges of the vanes are accurate
such as a pump or motor, employing one form of in
FIGURE 1 is a sectional view through a rotary device,
ly machined, ground and lapped so that substantially a 25 vention.
FIGURE 2 is a section on the line 2--2 of FIGURE 1.
?uid-tight sealing relationship exists among the edges and
FIGURE 3 is an end View of the device shown in
FIGURES 1 and 2, with a portion thereof broken away.
FIGURE 4 is a fragmentary section of a modi?ed
into a pump or motor of this character, the rotor shaft is
form of the invention.
journaled on precision bearings and high-quality seals and
FIGURE 5 is a fragmentary end view of the structure
gaskets are employed. The assembly is normally of
shown in FIGURE 4.
three-piece construction, in which the annular wall is
In the drawing, the rotary device may be taken as a
sandwiched between the two side walls and suitable re
typical construction representative of a ?uid pump or
movable securing means are utilized to hold the assem
35 motor, which comprises essentially a rotor housing 10
bly together.
having an annular or circumferential wall 112 sandwiched
It is a characteristic of many motors or pumps of this
between a base member or plate 14 and a radial side wall
character that at relatively frequent intervals inspection
16. These three components afford a cylindrical rotor
of the internal parts is in order, mainly as a precautionary
chamber 18 which has a circumferential interior surface
measure to determine the existing conditions of the vanes.
20 and a pair of radial interior surfaces 22 and 24 af
Heretofore, such inspection has required the removal of
forded respectively by the circumferential and radial
one of the side walls or plates, and this necessarily entails
walls 12, 14 and 16. The radial walls 22 and 24 are of
disturbing the gaskets and bearings, and great care must
course normal to the cylinder of the wall 20, and the walls
be exercised in disassembly and reassembly in order to
14 and 16 are appropriately recessed respectively at 26
maintain the precision characteristics of the device. Ac
cording to the present invention, this disadvantage is 45 and 28 to carry bearings 30 and 32 for journaling a rotor
shaft 34 which is rotatable on an axis perpendicular to
eliminated by the provision in one of the side walls or
the radial planes of the walls 22 and 24 and which is
plates of an access port having a removable closure mem
slightly eccentric as respects the true center of the cir
ber, and this access port is of such size and location as
cumferential wall 20. The shaft 24 may be driven by
to be laterally registrable with a position through which
the successive vanes will travel as the rotor is rotated. 50 any suitable means, not shown, to cause operation of the
pump or motor, which includes the provision of a rotor
More speci?cally, the port, which may conveniently be
36 keyed or otherwise ?xed to the shaft 34 within the
formed as a cylindrical bore, has a diameter slightly
chamber 18.
larger than the radial dimension of the impeller members
The rotor 36 has therein a plurality of uniformly cir
or ‘vanes. Hence, when the closure element is removed
and the rotor turned by hand, the vanes will successive 55 cumferentially spaced pockets or slots 38, each of which
opens radially outwardly to the interior circumferential
ly appear at the port and inspection thereof can be made
wall 20 and each of which also opens endwise respectively
from outside the housing without removal of any of the
to the interior radial walls 22 and 24. Each slot carries
basic housing components. Moreover, if it is necessary
therein a vane or equivalent impeller member 40‘, each
to remove a vane, the same may be withdrawn endwise
60 of which has its radially outermost edge 42 adapted to
from its pocket in the rotor via the access port.
travel over and in close contact with the circumferential
A still further feature resides in the provision on the
surfaces so that the pump or motor will operate at its
highest degree of efficiency. As part of the precision built
closure member of an inner face so fashioned as to lie
?ush with the inner radial face of the side wall in which
the port is formed, whereby the inner face of the closure
wall 20 and each of which has opposite end edges 44 and
46 adapted to travel over and in close contact respectively
with the interior radial walls 22 ‘and 24. It is at this
member forms a continuation of this radial wall without 65 point that the parts are precision formed so that an effec
edges travel over this radial surface. In this regard, it
tive ?uid seal is provided between each surface and its
respective cooperating edge of the vane. As is conven
tional, the vanes are urged outwardly by centrifugal force
is a signi?cant feature of the invention to provide co
or otherwise as the rotor rotates and the transfer of ?uid
interruption, thereby presenting no abrupt edges to inter
fere with operation of the vanes as their respective end
operative abutment means limiting inward positioning of 70 under pressure is ‘accomplished via ?uid inlet and outlet
the closure element to a condition in which the inner face
passages 48 and ‘50 formed in the housing.
internal part of the motor or pump without requiring
disassembly, as by removal of the several cap screws
assembly of the device. Consequently, the basic com
ponents of the device may remain in place and cooperat~
ing sealing surf-aces and bearing alignment will not be
52, for example, that hold the parts together, there is
Because of the aforesaid desirability of inspecting the
That form of the invention shown in FIGURES 4 and
provided in the radial wall 16 an access port or bore 54,
5 partakes of the advantages of the form just described,
which is here shown as having a diameter slightly in
but employs a different form of port and closure con
excess of the radial dimension of a vane 40. This port
struction. Accordingly, basic components of the device
is of course eccentric to the ‘axis of the shaft 34 and
that are the same as those illustrated in FIGURES l, 2
opens to the chamber 18 in such location that it is in
lateral register with ‘a position past which the vanes 40 10 and 3 will bear the same reference characters. These
are employed to designate the circumferential wall 12
successively pass as the rotor turns. This is best illus
having the circumferential interior surface 20, the radial
trated in FIGURES 1 ‘and 2, wherein it will be seen that
wall 16 having the interior radial surface 24, shaft 30,
the lower vane 40 is in register with the port 54. Since
bearing 32 and vanes 40. In this case, the radial wall
this vane is relatively loosely carried in its slot or pocket
38, it may be removed endwise from the rotor slot via 15 has an access port 154 normally closed by a closure ele
ment or plug 156, the inner radial face 158 of which is
the port 54 for inspection 'and/ or replacement.
The port 54 normally carries a closure element in the
form of a cylindrical plug 56 which has a cylindrical
outer surface precision-formed to ?t the cylindrical bore
fashioned to lie exactly coplanar with the interior radial
wall surface 24.
There is in this case no radial offset
or overlap between the interior circumferential surface
or port, and which further has an inner radial face 58 20 2%) and the circumference of the port ‘54, in which case a
different form of cooperative abutment means is relied
upon. Here, the wall 16, in its area at the outer end of
the port 154, has therein ‘an annular recess 160 and the
plug 156 has thereon an accurately machined annular
smooth travel of the end edges of the vanes over that sur
face. To insure that installation of the plug 56 always 25 shoulder 162 which ?ts within this recess so that the in
likewise precision-formed so that when it is normally in
position the face 58 lies perfectly ?ush with the interior
radial face 24, leaving no interruptions to interfere with
presents the inner face 58 thereof exactly in the plane
of the interior radial surface 24, cooperative abutment
means is provided, in this form of the invention compris
ing cooperating parts 60 and 62 respectively on the wall
12 ‘and on the plug 56-. The part 60 of the wall 12 com
prises a portion of the wall that overlaps a segmental
portion of the port 54. The diameter of the port and
plug are su?iciently in excess of the radial dimension of
the vanes 40 as to permit the relationship just described.
ward position of the plug 156 is correctly established
to maintain the perfect coplanar relationship between the
surface 24 and face 156, for the same purpose as that
described in connection with FIGURES 1, 2 and 3.
The end plate or cover which corresponds to the cover
64 in FIGURES 1, 2 and 3 is here designated by the nu
meral 164 and is shown as having portions 1179 and 172
respectively overlapping the bearing 32 and the area of
the outer end of the plug 156.
Here again, securing
Accordingly, when the plug ‘58 is installed, the portions
means such as cap screws and additional screws may be
60 and 62 will cooperate in the manner just described.
In original machining, the plug may be installed and the
position of the plug 156, the plate portion 172 is co
employed, as at 68. As means for securing the inward
axially drilled and tapped at 176 to carry a threaded ele
surfaces 24 and '58 accurately machined at the same time.
ment in the form of a set screw v:178 which coaxially
As the edges of the vanes and the surface 24—58 wear
during use of the pump or motor, it is expected that the 40 seats against the outer end of the plug 156. Except
for the difference just described, the form of the inven
wear will be evenly distributed and the coplanar rela
tion shown in FIGURES 4 and 5 performs the same func
tionship will continue to exist. Because of the preci
tions as that described in connection with FIGURES 1,
sion machining of the plug and port, an effective ?uid-tight
relationship is established.
The plug 56 is normally maintained in position by
securing means, here taking the form of an end plate
64 having releasable securing means in the form of screws
66 and additional cap screws 68 for securing the plate
removably to the outer face of the radial wall 16. This
plate has one portion 70 thereof radially overlapping the
bore 28 in which the bearing 32 is carried and it further
has another portion 72 overlapping the ‘area in which the
port 54 is formed. The interior part of the plate in its
portion 70 has an annular integral portion 74 which abuts
the outer radial face of the bearing 32.
The plate portion 72 has on its interior portion a
pilot stud 76 against which seats one end of biasing means
in the form of a compression spring 78. The outer por
tion of the plug 56 is coaxially recessed to receive the
2 and 3, and repetition is deemed unnecessary.
Features and advantages of both forms of the inven
tion, other than those categorically pointed out, will
readily occur to those versed in the art, as will many
modi?cations and alterations in these forms, all of which
will occur to those versed in the art, all without departure
from the spirit and scope of the invention.
What is claimed is:
l. A rotary device, comprising a housing having a ro
tor chamber including a circumferential wall having an
interior circumferential surface and a radial wall having
an interior radial surface normal to said circumferential
surface, and said chamber being closed at the side op
posite said radial wall; a rotor shaft extending through
the chamber generally centrally thereof on an axis normal
to said radial wall; means journaling the shaft in the
other end of the spring 78. Thus, the spring acts against 60 housing; a rotor ?xed to the shaft within the chamber
the plug and reacts against the wall portion 74 to normally
maintain the plug 56 in its normal condition in which
the face 58 is coplanar with the radial surface 24. The
outer end of the plug 56 is counterbored and tapped at
80 so that a threaded tool may be inserted into the
plug for facilitating withdrawal thereof after the plate
70 and spring 78 are removed. When the plate is re
moved, access is also available to the bearing 32, as well
as to ‘the interior of the rotor housing ‘when the plug is
withdrawn, and the rotor may be turned by hand so that
successive vanes occur in register with the port 54, through
which port these vanes may be individually drawn for
inspection and/or replacement. The access port and its
‘associated components 56 and 70 thus enable inspection
and replacement of the vanes without requiring a major
and having therein a pocket opening radially to the cir
cumferential surface and laterally to the radial surface;
an impeller member carried in the pocket and having an
outer edge portion and a radial edge portion adapted to
travel respectively over said circumferential and radial
surfaces as the rotor rotates; said radial wall having there
in an access port on an axis parallel to the rotor axis and
of such size and location as to be laterally registrable with
the impeller member at a predetermined angular posi
tion of said member in the chamber, and said member
being removably carried in said pocket for endwise with
drawal thereof through said port, said radial wall having
a substantial thickness in its axial dimension in the area
of said port so as to give said port a comparable substan
tial length; a plug element, of substantial axial length
having a close sliding ?t with the port and inwardly and
outwardly slidably carried by and normally closing the
of said ?rst wall, and, as a second part thereof, a portion
of the inner face of said elment normally abutting said
port and having an inner end face precision-fashioned to
lie ?ush with said radial surface, said element having an
outer end portion; cooperating abutment means preci
one part.
5. The invention de?ned in claim 1, in which: the abut
ment means includes as one part thereof shoulder means
sion-fashioned respectively on said element and one wall
and so dimensioned relative to said inner end face to
limit inward positioning of said element to a condition in
which said end face and radial surface are ?ush as afore
comprising an enlargement of the port in said radial wall
adjacent to the outer end thereof, and as a second part
thereof, shoulder means on the element normally abut
ting said ?rst mentioned shoulder means.
said; and securing means for releasably retaining said ele 10
6. The invention de?ned in claim 1, in which: the port
ment in place with the abutment means in cooperative
relationship, including an end member separate from said
element and abutment means and rigidly but removably
is cylindrical and the ?rst wall has at an outer portion
thereof an enlarged counterbore forming with said port
an annular shoulder, and the element is correspondingly
secured to the radial Wall in outwardly spaced radially
overlapping relation to said element outer end portion,
and force-exerting means within the port and coopera
tive between said end member and said outer end portion
cylindrical and has thereon an annular shoulder ?tting
said counterbore in normally abutting relationship, said
counterbore and said shoulder comprising the aforesaid
abutment means.
to act on one and react on the other substantially at their
axial centers to cause engagement of said abutment means
7. The invention de?ned in claim 1, in which: the shaft
journaling means includes a bearing in said radial wall;
with each other.
20 and the outer end member ‘includes a portion radially
2. The invention de?ned in claim 1, in which: yield
overlapping the bearing so that removal of said mem
ing said force-exerting means comprises biasing means
ber exposes said bearing simultaneously with exposure of
acting on the element to normally hold same in posi
said element.
tion with its abutment means cooperating with the wall
8. The invention de?ned in claim 7, in which: the
abutment means.
25 outer end member is in the form of a plate, and said
3. The invention de?ned in claim 1, in which: said
force-exerting means includes screw-threaded means car
force~exerting means includes a portion accessible from
outside said plate for adjustment thereof to vary its action
ried by said member and adjustable inwardly for urging
axially inwardly on the element.
the element into position with its abutment means co
operating with the wall abutment means.
4. The invention de?ned in claim 1, in which: the abut
ment means includes as one part thereof a portion of the
circumferential wall disposed in overlapping relation to
the port to partially obstruct said port at the radial face
References (fitted in the ?le of this patent
Dale et a1. ___________ __ June 16, 1953
Thomas et al. ________ __ Feb. 12, 1957
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