US985987A - Piston-drum for rotary engines. - Google Patents

Description

R. EISERMANN. PIS TON DRUM FOR ROTARY ENGINES.

PILI-ID MAY 18, 1910.

Patented Man?, 1911 RUDOLF EISERMANN, OF BERLIN, GERMANY, ROTATIONS-MASCHINEN GESELLSCHAFT M.

ASSIGNOR TO INTERNATIQNALE B. H., OF BERLIN, GEBMANY.

PISTONJDRUM FOR ROTABY ENGINES.

Specifieation of Letters Patent.

Application filed May 18, 1910.

Patented Mar, Ti', 19311..

Serial No. 582,059.

To all ou/tom it may concern:

Be it known that l, RUnoLr EISEREL NN, engineer, a. subject of the King of Prussia, residing at Berlin, Germany, have invented certain new and useful Improvements in Piston-Drums for Rotary Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a' part of this specification.

My invention relates to the structure of the piston drums or rotors of rotary engines and similar machines, and has for its Object to render such rotors stitfer than at present constructed to prevent the gripping or binding of the blades or abutment slides mounted in the radial slots thereof.

Eeterring to the drawings, in which like parts are similarly designated-h`igure 1 is a front elevation, partly in section, of a rotor embodying one form of my invention. Fig. 2 is a. side elevation thereof. Fig. 3 is a view Similar to Fig. 1, of a modification, and Fig. et is a side elevation of Fig. 3.

In those types of rotors for rotary engines and the like, in which the pi'ston slides move either axially or radially in the rotor, the rotor is slotted radially from its periphery toward its center. The slides are nounted in and slidable in those slots which sub-divide the core or rotor into segments connected together at 'or near the center of the rotor, whereby there is only a very small thickness of metal at the bases of the slots to hold the sectors together, as, for eX- ample, the small thickness of metal marked in Fig. 2. Though fraetures at these endangered points are not to be teared, as the pressure on one slide will, at the least deformation of the drum sector receiving such pressure, be transferred to the other seetors by the intermediary of the other slides, such transference of pressure produces considerable gripping between the slides and their ways, so that correspondingly great losses by frietion are eaused, and the slides may stick and be damaged in consequence thereof.

According to the present invention I provide distance pieces at suitable points, for the purpose of preventing the spring of the I sectors and the consequent gripping or stick- I ing of the sldes.

In such instances where the slots do not afiord sufiicient space for the arrangemeut of such distance pieces, the drum .may be enlarged at a suitable point, and the distance pieces may then be arranged in those parts of the slots which are situated within such enlargement.

Figs. l and 2 of the accompanying drawing exemplify a form for carrying out the present invention in a piston drum or rotor a, which provided as in U. S. Patent No. 894,391, with coucentric working grooves 7) turned in the end surtace of the rotor, and rad i al. longitu din al grooves c for receii 'ing the radially moving piston slides g, which have notches ?L corresponding to the grooves Z). The slots c subdivide the rotor into the sectors ?a between them and extend almost to the central shaft, leaving but a small body of metal between the grooves at the inner ends of the slots, so that these sectors will bend at these points when suficient pressure is placed on the slides in the slots. To obviate this, I fit in each groove or slot c in the center of the outer longitudinal edge thereof a piece (Z, so that each two adjoining sectors of the piston drum cannot alter their distance from each other, and the slides can therefore not be gripped by the spring of the sectors.

The abutment slides or piston slides must be provided with notches Fig. 1, considei'ably deeper, or having a radial length considerably longer than the depth or radial length of the pieces (Z that are fitted into the outer portions of the slots e to prevent the sector-shaped portions of the rotor between the slots c from springing or yielding when pressure is applied to the slides by reason of the fiuid used in the machine. Such notches z' permit the slides g to be properly moved in their slots without being hindered by the pieces (Z inserted in the outer ends of the slots. The constructional form shown in Figs. 1 and 2, is therefore, generally, only applicable when the bottoms of the oppositely situated concentrie grooves b in the opposite ends of the rotor are comparatively wide apart, as shown in Fig. 1. lil? the bottoms of the grooves b on the opposite sides of the rotor are close together, so as to leave but a thin web of metal between them, as in Fig. 3, then T provide the rotor 'tensions of the slots c in the rotor.

or drum With a collar-shaped enlargement e atits middle, as shown in Figs. 3 and 4:. This Collar-shaped enlargement is narrovver than the length of the rotor and is provided With slots that register With and form eX- The pieces d are then placed in these extensions of the slots c in the part e. A ring f is then placed around the Collar-shaped enlargenent to which the pieces (Z are secured if necessary. Thus it Will be seen that the rotor of any rotary fluid machine that has abutment slide slots of the character described Will be materially improved by the application of my invention, the slots Will be eiectually prevented from contracting by the pieces (Z, due to the spring of the sector-shaped portions of the rotor springing When the piston slides or abutment slides are under load, thereby preventing` said slides 'from becoming clamped or sticking in their slots.

I Claiml. The combination With a piston drum* engmes having radial slots for slide pistons; of distance pieces arranged in said slots to prevent the slots from altering` in Width.

2. The combination With a piston drum or rotor for rotary engines having radial slots for slide pistons; o' distance pieces arranged in said slots near their outer edges.

3. The conibination With a piston drum or rotor for rotary engines having radialslots for slide pistons; of a ring laid around or rotor for 'otary said drum and distance pieces arranged in said slots and attached to said ring.

4. .The combination With a piston drum or rotor for rotary engines having radial slots for slide pistons; of a Collar-shaped 40 enlargenent on the drum having slots registering With those in the drum and distance pieces in the slots of said enlargement.

5. The combination With a piston drum or `otor for rotary engines having radial slots for slide pistons; of a Collar-shaped enlargement on the drum having slots registering With those in the drum, a ring laid around said enlargement, and distance pieces arranged in the slots of said enlargement.

6. The combination With a piston drum or rotor for rotary engines having radial slots for slide pistons; of a Collar-shaped enlargement on the drum having slots registering With those in the drum, a ring laid around said enlargement and distance pieces arranged in the slots of said enlargement and secured to said ring.

7. The conbination With a piston drum or rotor for rotary engines having radial slots for slide pistons; of a ring laid around said drum and distance pieces arranged in said slots.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing Witnesses.

RUD OLF EISERMANN.

lVitnesses AUGUST TRAUTMANN, \VOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissone' of 'Eatents,

Washington, D. G.

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