US2920576A

US2920576A - Elliptical pump and fluid transmission

Info

Publication number: US2920576A
Application number: US650623A
Authority: US
Inventors: Jens T Pedersen
Original assignee: EDITH M PEDERSEN
Current assignee: EDITH M PEDERSEN
Priority date: 1957-04-04
Filing date: 1957-04-04
Publication date: 1960-01-12
Anticipated expiration: 1977-01-12

Description

Jan. 12, 1960 J. T. PEDERSEN 2 ELLIPTICAL PUMP AND FLUID TRANSMISSION Filed April 4, 1957 '3 Sheets$heet 1 Jens 7i Pedal-sen ZNVENTOR.

I m 3; W406 udfiiwayfi aam% Jan. 12, 1960 J. T. PEDERSEN 2,920,576

ELLIPTICAL PUMP AND FLUID TRANSMISSION Filed April 4, 1957 s Sheets-Sheet 2 Fig.2

Jens 7T Pedersen F/g 7 38 INVENTOR.

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII N kidm D eeeeeeeeeeee t3 ELLIPTICAL PUMP AND FLUID TRANSMISSION Jens T. Pedersen, Plymouth, Mich, assignor of one-half to Edith Pedersen, Plymouth, Mich.

Application April 4, 1957, Serial No. 650,623

6 Claims. Cl; 103-134 This invention comprises a novel and useful elliptical pump and fluid transmission and more particularly relates to an expansible chamber, device adapted for use as a fluid pressure pump or motor. I

The principal purpose of this invention is to provide a fluid pressure pump or motor of the expansible chamber type and wherein all of the moving parts thereof shall have a substantially continuous rotation.

A further object of the invention is to provide a pump or motor in which the working chamber in the stator shall be of an elliptical configuration and wherein the piston elements of the rotor shall be so shaped and proportioned as to have a continuous sealing engagement with the walls of the working chamber throughout their rotation through the working chamber.

A further and more specific object of the invention is to provide a fluid pump or motor having an elliptical ring-like working chamber together with a rotor having a plurality of elliptical shaped pistons each revolving continuously throughout the elliptical working chamber and having such geometry as to structure and motion as to maintain a tight sealing engagement with the walls of the working chamber at all times during the rotation of the piston elements.

A still further important object of the invention is to provide a fluid pump or motor which shall have a rela: tively small number of parts and wherein the same shall be very compactly assembled to effect a dependable and long lived operation.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had. to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view showing a suitable embodiment of a fluid pump or motor in accordance with this invention, a part of the power shaft being broken a y;

Figure 2 is a vertical central sectional view through the apparatus of Figure 1, being taken substantially upon the plane indicated by the section line 22 of Figure 1;

Figure 3 is a horizontal sectional view taken substantially upon the plane indicated by the broken section line 33 of Figure 2; I

Figure 4 and Figure 5 are vertical transverse sectional views taken substantially upon the planes indicated by the section lines 44 and 5-5, respectively of Figure 2 and showing in particular the geometry of the working chamber and of the piston elements therein;

Figure 6 is a detail view taken substantially upon the vertical plane indicated by the section line 66 of Figure 4 and showing the manner in which the piston elements are pivotally connected to the carrier plates of the rotor for oscillation about spaced parallel axes; and

Figure 7 is an exploded perspective view showing the 1W0 carrier plates and the piston elements of the rotor Patented Jan. 12, 1960 ice and a stationary core which forms the inner peripheral wall of the elliptical working chamber of the device.

In the accompanying drawings is exemplified an embodiment of an apparatus in corporating therein the principles of this invention. In general, the invention comprises a novel fluid motor or pump consisting of a stator having an elliptical workingv chamber in which is rotatably disposed a rotor having a plurality of elliptical bodies forming pistons and which are maintained in a constant parallel relation to each other during their rotation throughout the elliptical working chamber.

-It should be understood that the, invention is not limited in utility to any single specific purpose, but is broadly useful wherever a'po'sitive displacement type of pump or motor is desired, as for example in hydraulic drive mechanisms wherein a pump operates one or a plurality of motors as for example in use in automobiles, locomotives and the like. Further, the positive displacement of the fluid medium and the pistons of the rotor provide a highly eflicient and precise mechanism for controlling the conversion of power between a flowing fluid medium and a rotatable power shaft.

It will be further understood that-the apparatus illustrated in the accompanying drawings and described hereinafter in the specification may be constructed in various sizes as desired. The geometry of construction and of motion of the piston elements of the rotor and the elliptical working chamber of the stator is such that each elliptical piston element is moved throughout the chamber while being maintained in a parallel position to itself and to the other elements whereby the piston elements have a continuous sealing engagement with the inner and outer peripheral walls of the elliptical working chamber.

In the accompanying drawings, the apparatus consists of a stator 10 comprising a drum-like element open at its two sides and having a pair of end plates comprising

end walls

12 and 14 for closing the same, suitable fastening bolts 16 being provided for detachably securing the end walls to the drum-like member.

The two

end walls

12 and 14 have outwardly projecting

hubs

17 and 18 respectively, the hubs being displaced vertically from each other as will be apparent from Figure 2, the hub 17 comprising a diametrically enlarged hub 20 where it joins the end plate, and a diametrically re duced hub 22. -S imilarly,.the hub 18' of the end plate 14 has the diametrically enlarged hub 24 at its junction with the end plate 14, together with a diametricallyreduced outwardly projecting hub 26. From a comparison of Figures 2 and 3 it will be seen that the

hubs

17 and 18 are disposed in the same vertical plane or are in vertical alignment with each other but are vertically spaced for a purpose to be subsequently set forth.

As will be best apparent from Figures 2 and 3 in conjunction with Figure 1, it will be seen that the

end plates

12 and 14 are provided with a plurality of radially extending reinforcing webs or

fins

28 and 30 respectively which extend from the peripheryof the end plates into junction with the

hubs

20, 22 and 24, 26.

Referring now particularly to .Figures 2 and 3 it will be seen that the drum-like member 10 has its opposite side faces provided with

circular recesses

32 and 34 respectively. Between the faces the member 10 is provided with an internal peripheral wall 36,,which as shown in Figures 4 and 5 is of a generally elliptical shape. This wall comprises the outer peripheral wall of an elliptical working chamber of thepump or motor as will become subsequently apparent.

Received within the central chamber of the hollow stator member 10 is a centrally disposed core or body 38 carried by a mounting or supporting shaft 40. The core has an outer periphery 42 which is of an elliptical shape corresponding to that of the wall 36, and the surface 42 comprises the inner wall of the elliptical working chamber of the device. It will be noted from Figures 4 and 5 that the inner and

outer walls

42 and 36 respectively are equidistantly spaced to thus provide an elliptical working chamber having a uniform depth.

The mounting shaft 40 extends into the hub 26 of the endplate 14 and is fixedly secured thereto as by a pin 44, whereby the core is stationarily secured rigid with the stator. v

Received within the stator, in the central chamber thereof between the drum-like member and the

end plates

12 and 14 is a rotor assembly, the elements of which are shown in Figure 7. This rotor includes a pair of

carrier plates

50 and 52 which are preferably circular and of the same size. The plate 50 is received in the previously mentioned circular recess 32, of the drum like member 10, while the plate 52 is received in the corresponding recess 34. The axes of the recesses are vertically spaced from each other in the same manner as the spacing of the

hubs

17 and 18 previously men.- tioned, in order that the two carrier plates may rotate about axes which are vertically spaced from each other, The carrier plate 50 has an outwardly extending hub 54 which is rotatably received and journaled in the hub 20 of the end plate 12, and fixedly secured in this hub 54 as by a pin 56 is a power shaft 58 which in turn is journaled in the hub 22. Suitable journal and thrust bearings 60 are interposed between the power shaft, the hub 54- and the interior of the

hubs

22 and 20.

Power shaft 58 constitutes a means whereby rotation may be imparted to the rotor when the device is intended to function as a pump, or whereby power may be taken from the rotor when the device functions as a fiuid motor or turbine.

The other carrier plate 52 is likewise provided with an outwardly projecting hub 62 which is journaled in the hub 24 of the end plate 14 and upon the mounting shaft for free rotation thereon as by a suitable radial, pressed bearing member 63.

As so far described, it should be noted that the carrier plate may be considered as constituting a power or driving plate, while the carrier plate 52 constitutes an idler or driven plate.

The combination of the two

carrier plates

50, 52 and the peripheral inner and

outer surfaces

42 and 36 constitute the elliptical working chamber of the pump or motor, in which are disposed for continuous rotation a plurality of pistons carried by the carrier plates in a manner to be now described.

The carrier plate 50 is provided with a set of pins 64,

while the other carrier plate 52 is provided with a second set of pins 66. These pins project toward each other and are of a length not exceeding the .distance between the two carrier plates when mounted as shown in Figures 2, 3 and 6. The two sets of pins thus form pairs of pins, each pair comprised of one pin on each plate, and the pins of each pair are disposed in vertically spaced relation as will be best apparent from Figures 4, 5 and 6. The pins 64 are arranged in a circle about the axis of rotation of the carrier plate 50, while the pins 52 are disposed in a circle of the same radius about the axis of rotation of the carrier plate 52. Thus each pin 66 of the carrier plate 52 is vertically offset below its corresponding pin 64 of the other carrier plate 50.

The piston elements comprise a plurality of elliptical bodies 68, each having a pair of

bores

70 and 72 therein. The bores 70 of each piston receives one of the pins 66 of the carrier plate 52, the bores 72 receive the pin 64 of the carrier plate 50. By this means, each of the elliptical piston elements is maintained-in a constant attitude so that as .the two carrier plates of the rotor revolve, the piston elements will ,travel continuously throughout the elliptical working chamber ,formed between the inner and outer ,walls .42 -an d .36, respectively, with the piston elements being maintained parallel to 4 each other throughout their rotation through the working chamber.

The dimensions of the piston elements are such that they will at all times maintain a continuous sealing engagement with the inner and outer walls of the working chamber, as will be apparent from Figures 4 and 5. It will be understood that the geometry of the pistons and. the elliptical'inner and Outer walls of the working chamLI- her are such as to efiect this operation.

Referring now particularly to Figures 4 and 5 it will be seen that means are provided for introducing a fluid intothe working chamber and for exhausting a fluid therefrom. Conveniently, two such inlet and outlet means. are provided upon opposite sides of the axis of rotation of the rotor. Thus, aligned fluid inlet and outlet passages and 82 are provided in the upper portion of the stator, and corresponding inlet and

outlet passages

84 and 86 are provided in the lower portion thereof, the two sets of aligned passages being parallel to each other. Internally threaded bosses 88 are provided at the outer ends of each of these passages whereby suitable fluid conducting conduits or connections may be made with the device. At their inner ends, the inlet and outlet passages merge smoothly into the outer elliptical peripheral wall of the working chamber.

By virtue of the tight sealing engagement between the piston elements and the inner and outer walls of the working chamber, -,'it will be seen that there is a positive displacement of fluidfrom an inlet passage to an outlet passage. Thus, if the device is employed as a pump, there will be a positive impelling of fluid from the inlet passage, through the working chamber into the outlet passage for each of the upper and lower sets of fluid inlet and outlet means. Conversely, if the device is employed as a motor, the passage of fluid under pressure from the inlet passage to the outlet passage through the working chamber will produce a positive displacement of the pistons and thus a precise rotation of the rotor and of the power shaft connected therewith.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimedas new is as follows:

1. A pump .or motor-comprising a stator having an annular working chamber therein of elliptical shape, a plurality of pistons in said chamber and means supports v ing said pistons in fixed parallel relation for rotation through said chamber, said stator including, a drum-like member having a concave surface, constituting the radially outer wall of said chamber and a pair of end walls having parallel hubs, a pair of shafts each mounted in one of said hubs and extending into said chamber, one of said shafts being fixed to its hub and an eccentric bodyfixed on said'one shaft and disposed in said drumlike member to comprise the radially inner circumferen- =tial Wall of said chamber, said supporting means including a pair of carrier plates constituting side walls of said chamber and each mounted on one of said shafts for rotation and disposed within said drum-like member, means pivotally securing each piston to both of said carrier plates for oscillation of said pistons about the parallel axes of their connections with the two carrier plates in response to rotation of the latter about the parallel ,axes of said shafts, means for introducing fluid into said chamber and means for exhausting fluid from said chamber.

2. The combination of claim 1 wherein the opposite sides of said drum-like member have eccentrically disposed circular recesses receiving said carrier plates, said end plates retaining said carrier plates in said recesses.

3. The combination of claim 1 wherein one carrier plate is rotatable upon said one shaft and the other carrier plate is fixedly secured to the other of said shafts.

4. The combination of claim 1 wherein said carrier plates have hubs journaled in the hubs of said end walls.

5. The combination of claim 1 wherein the opposite sides of said drum-like member having eccentrically disposed circular recesses receiving said carrier plates, said end plates retaining said carrier plates in said recesses, fastening bolts extending through said drum-like member and each of said end plates and detachably securing them together.

6. The combination of claim 1 wherein the opposite sides of said drum-like member have eccentrically diaposed circular recesses receiving said carrier plates, said end plates retaining said carrier plates in said recesses, said eccentric body being engaged on opposite sides by said carrier plates and spacing the latter.

References Cited in the file of this patent UNITED STATES PATENTS 1,467,944 Mason Sept. 11, 1923 1,580,808 Borden Apr. 13, 1926 1,700,038 Feuerheerd J an. 22, 1929 FOREIGN PATENTS 167,360 Austria Dec. 27, 1950