US 1290657 A
Description (OCR text may contain errors)
P. A. RASMUSSEN.
APPLKCATION FlLED-MML'h 191a.
LQQQ6J5? Patented Jan. 7, 1919.
3 SHEETSSHEET l. 7 ffqz,
l/VVENTOR ATTORNEY P. A. RASMUSSEN.
APPLICATION FILED MA.R.4. 1918.
1,290,657. I Patented Jan. 7, 1919.
3 SHEETSSHEET 2.
L Y A TTOR/VE Y P. A. RASMUSSEN.
APPLICATIUN FiLED MAR. 4. 191B.
Patented Jan. 7,1919.
3 SHEETSSHEET 3.
P f/l/ "1 A TTOH/VE Y we nomu! runs on. Pmzmurnm umsumnmm. n 4
PETER A. RASMUSSEN, OF CHICAGO, ILLINOIS.
ROTARY EN GIN'E.
Specification of Letters Patent.
Patented Jan. '7, 1919.
Application filed March 4, 1918. Serial No. 220,229.
To all whom it may concern:
Be it known that 1, PETER A. RASMUSSEN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification.
This invention relates toimprovements in rotary engines and particularly that type of such engines, in which steam or other gaseous motive fluid is employed to act against sliding wing pistons and flows transversally with respect to the power shaft, instead of axially therewith, and it consists in certain peculiarities of the construction, novel arrangement and operation of various parts thereof as will be hereinafter more fully set forth and specifically claimed.
The principal object of the invention, is, to provide a rotary engine to be used for various purposes, which shall be simple in construction, compact in form, durable and eificient in operation, and constructed with special reference to securing very high speed and to realizing the maximum of efficiency from the motive fluid. Another important object, is, to provide means for utilizing the motive fluid in the actuation of the sliding or wing pistons outwardly with respect to the rotor on which they are mounted, and also for actuating packing strips which said pistons carry to form closures between the pistons and parts of the engine cylinder.
Other objects and advantages of the invention will be disclosed in the subjoined description and explanation.
In the accompanying drawings which serve to illustrate an embodiment of the invention,
Figure 1, is a central vertical sectional view through the engine taken on line 1, 1, of Fig. 2 looking in the direction indicated by the arrows.
Fig. 2, is a sectional view taken on line 2, 2, of Fig. 1, looking in the direction indicated by the arrows.
Fig. 3, is an enlarged fragmental sectional view taken on line 3, 3, of Fig. 1, looking in the direction indicated by the arrows.
Fig. 4, is a fragmental view in side elevation of the body of the rotor taken on line 4, 4, of Fig. 3, looking in the direction indicated by the arrows.
' Fig. 5 is an enlarged sectional view taken on line 5,15, of Fig. 2 looking in the direction indicated by the arrows showing the construction of one of the wing pistons and its side packing strips.
Fig. 6, is a diagrammatic view of the engine casing showing the iston carrying ro' tor mounted therein with the pistons in one of their positions and illustrating the radii on which the arcs of the chamber of the casing are formed, and
Fig. 7, is a like view of like parts showing the pistons in other positions which they will assume in the revolution of the rotor.
Like numerals of reference refer to corresponding parts throughout the different views of the drawings.
The cylinder of the engine is indicated as a whole by the reference numeral 7, and as usual consists of heads or end members 8 and 9 which are bolted at their peripheries to the casing or circular portion 10 of the cylinder, which portion is provided at a suitable point with an inlet 11. for the passage of steam or other motive fluid through the cylinder from which it will be exhausted through an outlet opening or port 12 located at any suitable point. The inlet opening 11 may have communication with a supply of steam or other motive fluid through a pipe 13 which communicates with the inlet 11. and may be secured thereto by any suitable means. The cylindcr 10 is mounted on a suitable base 14 to which the heads 8 and 9 may be secured at their lower portions by means of bolts or otherwise. As is clearly shown in Figs. 1 and 2 of the drawings each of the heads 8 and 9 is provided with an outwardly bellied portion 15 which are circular in shape and provide circular cavities 16 on the inner surfaces of said heads or end pieces. The portions 15 and their cavities 16 are located eccentrically with respect to the cylinder casing 10. Each of the portions 15 of the cylinder heads is provided centrally with a hub 17 in which the sections 18 and 19 constituting the power shaft are journaled. Each of the sections 18and 19 of the power shaft is fixed at its inner end to a disk or plate 20 which are of suflicient size to fit snugly within the peripheral walls of the cavities 16 yet so as to rotate therein without undue friction. Located between the disks or plates 20 is a cylindrical body 21 which together with the members 20 constitute the rotor of the engine. The body 21 of the rotor is provided with a plurality of radially disposed slots 22, usually four in number, as shown in Fig. 1 of the drawings,
which slots 01' recesses extend through the periphery of the body 21 inwardly for asufiicient distance to permit of the operation of the wing pistons which they accommodate. The inner end of each of the slots or recesses 22 is closed by a solid portion 23 of the body 21 which solid portion extends from one side of the body 21 to the other side thereof and rests against the inner surfaces of the disks or plates 20 which are firmly secured to the body 21 by means of bolts 24 extended through suitable openings in the disks and said body at suitable distances apart. The portion 23 of the rotor body 21 is provided with a number ofopenings 25 to receive connecting rods 26 employed for uniting the opposed Wing pistons 27 one "of which is located in each of the recesses 22 of the rotor body. Each of the pistons 27 is rectangular in shape as shown, and is provided with a longitudinally extended slot 28 which extends from near the inner end of the piston 27 through its outer end and is open at each of its sides. Fitted in each side of the slot 28 of each of the pistons 27 is a stem 29 of a packing strip 30 each'of which is substantially T-shaped in cross section as is clearly shown in Fig. 5 of the drawings. The packing strips rest at their outer surfaces against the inner surfaces of the heads 8 and 9 of the engine cylinder and are employed to provide tight closures between the pistons and said heads, or to compensate for the wear of the parts incident to continuous use. Each of the pistons 27 has its side edges beveled as at 31, see Fig. 5, to cause the motive fluid to press against the inner surfaces of the packing strips 30 and thereby press said strips outwardly, for it will be understood that the stems 29 of said strips are movably located within the slots 28 of the pistons. The packing strips 30 extend from the inner ends of the slots 28 to a point near the outer ends thereof but terminate at their outer ends flush with the outer ends ofthe pistons so as not to interfere with the operation of packing strips 32 one of which is located transversally with respect to the casing 10 on the outer end of each of the pistons 27 and has a stem 33 extended into the slot 28 thereofbetween the sterns29of the side packing strips 30. Each of the packing strips 32 is substantially T-shap'ed in cross section but has its outer surface slightly curved as shown in Fig. 1 of the drawings. The outer ends of at least one of the faces of each of the pistons 27 is beveled as at 3 1 toward the packing strips 32 for the purpose of directing the motive fluid against said strips in order that they may be pressed outwardly thereby and against the inner periphery of the casing 10 to form a tight closure and to compensate for the wear of the p arts,,it;being understood that the stems 33 of the packing strips 32 are movably located in the slots 28 of the pistons.
portions 15 of the heads of the cylinder, but
that the body 21 of'the rotor is of greater diameter than said disks and projects into the space between the heads of the cylinder. This projecting portion of the'body 21 of the rotor is provided at each of its sides with an angular recess 35 in each of which is fitted a segmental angular packing strip 36 which extends from one of the slots 22 in the rotor body 21 to the adjacent slot thereto. At the inner edge of each of the packing strips 36 the periphery of the body 21 is provided with a groove or beveled portion 37 to permit the motive fluid to contact with the inner edges of said strips so as to force them outwardly in close contact with the inner surfaces of the heads of the cylinder. The packing strips 36 are held in movable engagement with the periphery of the rotor body 21 by means of bars 38 which are extended cross-wise of said body and overlap the strips 36 as is clearly shown in Fig. 3 of the drawings. The bars 38 are fastened to the body 21 by means of screws 39 and said strips are prevented circumferential movement on the body 21 by means of an inwardly extended off-set portion 40 with which each of said strips is provided to fit in-a suitable recess ail formed in the rotor body 21 therefor.
By reference to Figs. 1 and 2 of the drawings it will be seen thatthe rotor body 21 is provided on-one side of each of the slots 22 therein with a port 42 which extends from the inner ends of the recess 22 or from the solid portion 23 of the body alongside said recesses and through the periphery of the body 21 at points quite near the outer ends of said recesses at their intake sides. By employing these ports it isobvious that as oon as the'outer end of one of said ports is placed in communication with the supply of motive fluid, said fluid will pass through said port into the inner end of the recess 28 with which it is connected and will exert itspower on the inner :end of the. piston '27 thus assisting it in its outward movement. The casing 10 of the cylinder may be :provided with a segmental-groove 43-at its inlet portion and Witha similar groove Mat its outlet or exhaust portion to facilitate the inlet ofthe motiye fluid and its exhaust.
Referring to Fig. 6, of the drawings, it will be seen and understood that-the cavity of the casing 10 of the engine cylinder is cam-shaped circu-mferentially and that 'the haust outlet, of a between the lines C and D which arc is struck or formed on the radius F leading from the axis I of the rotor shaft. It will be further noted that the arc of the casing located between the lines A and B is struck or formed on the radius E leading from the axial point I of the rotor and that said radius E is much longer than the radius F. The arcs of the casing between the lines B and C and between the lines D and A are formed or struck from the radial lines G and H which have a common center K located in a vertical plane some distance above the axial point I of the rotor shaft. Thus it will be seen that the inner periphery of the casing 10 describes a cam-shaped figure that is formed from two axes I and K, the axis I having two radii E and F of different lengths while the axis K has two radii G and H of equal lengths. In the rotation of the rotor 21 it is apparent that the pistons 27 will have no sliding or radial movement as they pass the are beginning at the lines A and C until they have passed the lines B and D but after passing the last named lines it is apparent by reference to Fig. 7 of the drawings, that they will have sliding movements until the lines A and C are reached.
Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent isl. The combination with a suitably mounted cylinder having communication with a supply of motive fluid and an expower shaft eccentrically journaled in the cylinder, a rotor fixed to said shaft and extended therefrom within the cylinder and having a plurality of radial slots extended through its periphery and provided near the intake side of each slot with a port communicating at its inner end with the inner end of the same, segmental packing strips circumferentially and movably mounted on the periphery of the rotor at each of its sides and having portions exposed to the action of the motive fluid, a wing-piston slidably mounted in each of the Copies of this patent may be obtained for five cents each, by addressing the slots of the rotor and adapted to cont-act at its outer end with the inner periphery of thecylinder, and members slidably and radially mounted on the rotor between each pair of the opposed slots and connecting the pistons therein in opposed pairs.
2. The combination with a suitably mounted casing having a circumferentially cam-shaped chamber in communication with a supply of motive fluid and provided with an exhaust outlet, said casing having on the inner surface of each of its ends a circular recess located eccentrically with respect to said chamber but in communication therewith, the inner periphery of the casing having a pair of opposed arcs formed from radii having the same axis but one of said radii being greater than the other, the inner periphery of said casing also having a pair of opposed arcs located between the first named arcs and formed from radii of equal length having a common axis but independ-- ent of the first named axis, a power shaft concentrically journaled in said circular recesses but eccentrically journaled with respect to the said chamber in the casing and with its axis coinciding with the first named axis, a rotor fixed to said shaft and extended therefrom within the said chamber and so as to present a portion of its periphery close to the shorter arc of the first named pair of arcs of the casing, said rotor having its ends reduced and located in said recesses and also having a plurality of radial slots extended through its periphery, a wing-piston slidably mounted in each of said slots and adapted to contact at its outer end with the inner eriphery of the casing, and members slidably and radially mounted on the rotor between each pair of the opposed slots and connecting the pistons therein in opposed pairs.
PETER A. RASMUSSEN.
CHAS. C. TILLMAN, CECILIA CASEY.
"Commissioner of Patents,
Washington, D. c."