US3197126A - Rotary piston machine - Google Patents

Description

July 27, 1965 G. JUNGBLUTH 3,

ROTARY PISTON MACHINE Filed Mdrch z, 1963 lnvenl'or:

a: a7 7317f United States Patent 2 Claims. cl. 230-145 The present invention relates to a rotary piston machine, preferably circular piston machine, of the general type which comprises an outer confining body with lateral confining walls and an inner body or rotor eccentrically journalled in said outer confining body and confining therewith the working chambers of the rotary piston machine. More specifically, the present invention relates to a rotary piston machine of the just mentioned type in which between the lateral confining walls for the piston and the end faces of the piston there are respectively provided lubricant seals which surround the eccentric shaft on which said rotor is journalled.

With heretofore known circular piston machines, the seal of the working chambers with regard to the journals for the eccentric shaft is effected by sealing elements which are located on the end faces of the piston and engage said lateral confining walls. The mounting of the sealing elements in or on the piston brings about that the sealing elements are subjected to centrifugal forces. EX- perience has shown that such an arrangement makes a proper seal difficult. A further drawback of the said heretofore known sealing arrangement consists in that lubricant can be withdrawn only from certain locations in conformity with the rotation of the piston.

It is, therefore, an object of the present invention to provide a sealing arrangement for rotary piston machines of the above-mentioned general type, which will overcome the above-outlined drawbacks.

It is another object of this invention to provide a sealing arrangement as set forth in the preceding paragraph, in which the sealing elements will not be subjected to centrifugal forces.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing diagrammatically illustrating a vertical longitudinal section through a circular piston machine providedwith an oil seal arrangement according to the present invention.

The oil seal arrangement according to the present invention is characterized primarily in that the oil seals are arranged in the lateral confining walls of the outer confining body of the machine. More specifically, the lateral confining walls of the outer confining body are provided with recess means, for instance an annular groove, for receiving a sealing ring and the pressing means pertaining thereto.

Referring now to the drawing in detail, the arrangement illustrated therein shows a piston 1 journalled on an eccentric shaft 2. Piston 1 is, in conformity with the general design of well-known rotary piston machines, provided with three crests or zenith edges in conformity with the inner enveloping curve of an epitrochoid. These three ridges, by means of sealing strips thereon, seal the working chambers of the machine relative to each other, as is well known in the art, which working chambers are formed by the piston and the enveloping body therefor, the inner contour of said enveloping body being provided with two axis-near zones in conformity with the epitrochoid contour of the piston. The outer confining body of the rotary piston machine has lateral confining walls or side walls, which are composed of the side wall members 3 and ring members 7, 7'. The eccentric shaft 2 is 3,197,126 Patented July 27, 1965 "ice journalled in the said side walls. For purposes of kinematically controlling piston 1 with regard to the enveloping body, piston 1 is provided with inner teeth 4 in the form of a gear ring. The inner teeth 4 are in mesh with a pinion 5 of a pair of pinions the other pinion 5a of which meshes with teeth of a ring gear 6 forming part of a stationary ring 7. Ring 7 is connected to the adjacent side Wall members 3 by means of screws 8. The outer peripheral surface of ring 7 is adjacent bore 9 of the adjacent side wall member 3 provided with an annular cutout 7a in which is mounted a sealing ring 10 sealingly engaging the adjacent end face of piston 1. Similarly, ring 7 is provided with an annular cutout 7a having arranged therein a sealing ring 10 engaging the adjacent end face of piston 2. Behind the sealing rings 10, 10' there are respectively provided springs 11 which continuously urge the sealing rings 10,19 against piston 1 while exerting upon said sealing rings the necessary sealing pressure.

As will be evident from the above, with an arrangement of the lubricant seals according to the invention, the sealing elements are not subjected to centrifugal forces. The function of the sealing elements is, therefore, easier to control. Inasmuch as the sealing elements have a certain position with regard to the lateral confining Walls of the machine, the sealing will be greatly facilitated. It is easy to provide a continuous oil return at the inner circumference of the seal.

With a circular piston machine operating as internal combustion engine, the sealing elements arranged in the lateral confining walls of the machine are better protected against heat emanating from the combustion chamher than is the case with heretofore known circular piston engines.

With the arrangement of the sealing elements in conformity with the present invention, it is, therefore, possible when employing rubber elements on the sealing system, to use less heat resistant and therefore cheaper rubber elements.

As will also be evident from the above, with a rotary piston machine in which the lateral confining walls of the machine have bores with bushings therein, it is possible advantageously to provide the bushings with annular recesses or the like for receiving the sealing means. One or both bushings may at the same time be provided with stationary gear means necessary for the kinematic control of the piston relative to the confining body of the machine. In particular, rings or the like for holding the sealing elements, are avoided by the present invention.

It is, of course, to be understood that the present invention is, by no means, limited to the particular construction shown in the drawing, but also comprises any modifications within the scope of the appended claims. Thus, while the drawing shows the gear system 4,.5, 5a, 6 on one side only of piston 1, it may, of course, be duplicated for the other side of the piston, in which instance ring 7 could be replaced by a ring similar to ring 7.

It is furthermore to be understood that the invention is applicable to rotary piston engines of all types, which means for rotary piston engines which operate as internal combustion engine, as blower, or as pump. This applies to rotary piston machines as well as to circular piston machines.

What I claim is:

1. A rotary piston machine, especially circular piston machine, which comprises: a stationary outer confining body including two lateral confining wall means, eccentric shaft means rotatably journalled in said outer confining body, a rotary piston arranged within said confining body and journalled on said eccentric shaft means, said rotary piston having its axis of rotation substantially perpendicular to said lateral confining wall means, each of said lateral confining wall means comprising a Wall member with a bore having its axis extending in the direction of the axis of rotation of said eccentric shaft means, two ring means respectively extending into said bores and connected to said wall members, each of said wall members confiningwith the ring means connected thereto an annular chamber extending in spaced relationship around the axis of said rotary piston and opening toward the respective adjacent end face of said piston, sealing means respectively mounted within said annular chamber for sealing engagement with the end faces of said rotary piston, and means located in said annular chambers and yieldably pressing said sealing means against the respective adjacent end faces of said piston.

2. A rotary piston machine, especially circular piston machine, according to claim 1, in which at least one of References Cited by the Examiner UNITED STATES PATENTS,

647,717 4/1900 Dearing. 892,351 6/08 Beaubien. 3,033,180 5/62 Bentele 1238 FOREIGN PATENTS 647,7 ()9 8/62 Canada.

LAURENCE V.- EFNER, Primary Examiner.

Claims (1)

1. A ROTARY PISTON MACHINE, ESPECIALLY CIRCULAR PISTON MACHINE, WHICH COMPRISES: A STATIONARY OUTER CONFINING BODY INCLUDING TWO LATERAL CONFININF WALL MEANS, ECCENTRIC SHAFT MEANS ROTATABLY JOURNALLED IN SAID OUTER CONFINING BODY, A ROTARY PISTON ARRANGED WITHIN SAID CONFINING BODY AND JOURNALLED ON SAID ARRANGED WITHIN SAID CONFINING BODY PISTON HAVING ITS AXIS OF ROTATION SUBSTANTIALLY PERPENDICULAR TO SAID LATERAL CONFINING WALL MEANS, EACH OF SAID LATERAL CONFINING WALL MEANS COMPRISING A WALL MEMBER WITH A BORE HAVING ITS AXIS EXTENDING IN THE DIRECTION OF THE AXIS OF ROTATION OF SAID ECCENTRIC SHAFT MEANS, TWO RING MEANS RESPECTIVELY EXTENDING INTO SAID BORES AND CONNECTED TO SAID WALL MEMBERS, EACH OF SAID WALL MEMBERS CONFINING WITH THE RING MEANS CONNECTED THERETO AN ANNULAR CHAMBER EXTENDING IN SPACED RELATIONSHIP AROUND THE AXIS OF SAID ROTARY PISTON AND OPENING TOWARD THE RESPECTIVE ADJACENT END FACE OF SAID PISTON, SEALING MEANS RESPECTIVELY MOUNTED WITHIN SAID ANNULAR CHAMBER FOR

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