US1365226A - Rotary engine - Google Patents

Description

l. D. CARROLL.

ROTARY ENGINE.

APPLICATION FILED MAR.2Z, 19x9.

2 SHEETS-SHEET l.

J. D. CARROLL.

ROTARY ENGINE.

Patented Jan. 11, 1921'.

HEETS-SHEET 2 Lfohnfl TF'OZZ 1?? rm UNITED STA'lEi PATENT OFFICE.

JOHN D. CARROLL, 01" WEST LAFAYETTE, INDIANA, ASSIGNOR T0 TURBO ROTARY ENGINE COMPANY, or EVANSVILLE, INDIANA, A CORPORATION or SOUTH DA- KOTA.

ing at West Lafayette, in the county of Tips pecanoe and State of Indiana, have invented certain new and useful Improvements 111 Rotary Engines, of which the following is p a specification. v

This invention relates to rotary engines, and has reference more particularly to improvements in the cylinders of such engines.

In engines of this class, wherein the circular inner wall of the cylinder is traversed by the free edges of-piston vanes or blades, it has heretofore been proposed to employ oblique steam supply and exhaust ports for the purpose of preventing excessive wear on the packings carried by the outer edges of i the vanes or blades which sweep over the ports. By giving to the port an oblique or inclined direction relatively to the longitudinal direction of the packing strip, a square impact of the packing strip on the edge of the port is avoided.

Where, as heretofore, the oblique port is made to extend the full width of the cylinder wall, one objection arises, growing out of the fact that the frictional tendency of the grid bars which space the ports is to crowd the packing strip always toward one edge of the piston blade, increasing the liability of leakage.

The purpose or object of my present improvement is to provide a construction which shall preserve the advantages of the oblique ports, both on the intake side of the engine and on the exhaust and compression relief side, and at the same time shall avoid the tendency referred to to continually crowd the packing strip on the end of the piston blade toward one side of the latter.

My invention, its structural features, and its advantages will all be readily understood and appreciated by those skilled in the art from the following description, taken in connection with the accompanying drawings, in which- Figure 1 is a transverse section through a rotary engine of the eccentric piston type showing my improvements embodied therein;

Fig. 2 is a vertical section on the line 2-2 of Fig. 1;

Fig. 3 is a plane view of the exhaust and ROTARY ENGINE.

Specification of Letters Patent. Pate t d J 1 1921 Application filed March 22, 1919. 2

Serial No. 284,401.

COIlPIGSSlOD relief side of the cylinder wall; an Fig. 4' is a view similar to Fig. 3, showing the steam intake side of the cylinder wall, substantially on the line 4-4 of Fig. 1.

Referring to the drawings, 5 designates as an entirety the stationary cylindrical wall of the engine, 6 designates the drivenshaft, 7 des gnates a stationary bearing boss for the piston vanes, which is eccentric to the driven shaft 6, 8 designates a bushing surround ng the boss 7, 9 designates each of a plurality of piston vanes that are journaled on the bushing 8, and 10 designates a rotary drum structure carrying rockers 11 in and through which the piston vanes 9 extend with both a sliding and rocking motion. In the outer ends of the piston vanes 9 are mounted packing strips 12, which form steam-tight joints with the inner wall of the cylinder 5.

The parts thus far described are wellknown cooperating elements of a common type of rotary engine.

Referring now to those structural fea tures wherein my present improvements reside, 13 designates as an entirety the steam intake port of the engine, and 14 designates as an entirety the steam exhaust and compression relief port. Referring to Fig. 4 it will be seen that the intake port 13 is made up of a grid-like structure comprising two series of oppositely inclined oblique ports or passageways 15 and 16 that are spaced by a central bar 17 and oblique bars 18 and 19 that separate and space the individual ports 15 and 16 respectively.

The same structural feature is preserved in the relatively long exhaust and compression relief port 14, this being a grid-like structure of a central longitudinal bar or strip 20 and oppositely inclined oblique radiating bars or strips 21 and 22, between which are formed the oppositely inclined oblique individual ports 23 and 24. The direction of travel of the vane packing 12 over the ports 13 and 14 is indicated by arrows in Figs. 3 and 4.

It will also be observed best by reference to Fig. 3 that the individual ports 23 and 24 on the exhaust and compression relief side are of gradually decreasing width from the lower to the upper end of the port. This construction is preferable for the reason that at the lower end, where the exhaust begins, the exhaust pressure is highest and gradually decreases toward the upper end. The compression on the advance side of the piston vane also decreases toward the upper end of the port. Hence, the total area of the individual exhaust and relief ports is graduated in accordance with the requirements of the pressures handled on both sides of the piston vane as the latter is traveling over the port.

It will further benoted, as constituting the principal advantage of the described construction, that the friction effect of the grid-bars on the opposite sides of the central longitudinal bar is to move the packing 12 equally toward both sides of the piston vane. The friction effect on one side, therefore, exactly neutralizes the friction effect on the opposite side, the result being that there is no tendency LO shift the packing strip toward either side of the piston vane.

I claim:

1. A rotary engine cylinder having formed structure for the passage of motive fluid, comprising a central longitudinal bar and lateral bars extending obliquely from the sides of said central bar in a forwardly inclined direction relatively to the direction of piston travel and forming between them individual ports.

3. A rotary engine cylinder having formed in the circumferential wall thereof a grid structure for the outlet of motive fluid, comprising a central longitudinal bar and lateral bars extending obliquely from the sides of said central bar, said lateral bars on each side of said central bar being progressively spaced closer togetherfrom one end to the other of said grid structure, thereby forming between them individual ports of progressively decreasing width.

4. A rotary engine cylinder having formed in the circumferential wall thereof a grid structure'for the outlet of motive fluid, com prising a. central longitudinal bar and lateral bars extending obliquely from the sides of said central bar in a forwardly inclined direction relativelyto the direction of piston travel, said lateral bars on each side ofsaid central bar being progressively spaced closer together from the piston-entering to the piston-leaving end of-said grid structure, thereby forming between them individual ports of progressively decreasing width.

JOHN D. CARROLL.

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