US902585A

US902585A - Rotary engine.

Info

Publication number: US902585A
Application number: US37599207A
Authority: US
Inventors: Friedrich Carl Krueger
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-05-27
Filing date: 1907-05-27
Publication date: 1908-11-03
Anticipated expiration: 1925-11-03

Description

P. o. KRGBR.

ROTARY ENGINE.

APPLICATION FILED MAY 27,1907.

902,585.V Patented Nov. 3, 1908. ya

o i y 'I 'y 'j {gj/WM @5MM MQW y ./3. V/Mw FRIEDRICH CARL KRGER, OF HANOVER, GERMANY.

ROTARY ENGINE.

Specification of Letters Patent.

Appcation led May 27, 1907.

Patented Nov. 3, 1908.

Serial No. 375,992.

To all whom t may concern:

Be it known that I, FRIEDRICH CARL KRGER, a subject of the German Emperor, and resident of Hanover, Germany, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification.

In the machines known until now which have a stationary cylinder and a wing piston rotating in tangential contact therewith, the good lateral `tightness is obtained by means of special annular segments which are concentrically engaged into the front surface of the piston drum and are pressed by springs against the front surfaces of the cylinder heads. The said annular segments must exert a constant tightening action not only on these front walls upon which they slide continuously, but also on the outer cylindrical sliding surface, if agood tightness is to be obtained especially in the corners. The object of this invention is to provide a special arrangement for such tightening segments which would respond to the above requirements. To this effect the tightening member which until now has been held at the piston drum by means of a groove is provided at its outer periphery with more or less radially directed teeth and put into mesh with a similar toothing arranged at the periphery of the piston drum.

In the annexed drawing, Figures 1, 2 and 3 show cross and longitudinal sections of a rotary steam engine of well known construction and provided with tightening or packing segments arranged according to the present invention. In said figures the packing segments are supposed to have been removed above the axis of the piston and have not been shown for sake of clearness and in order to show more clearly the appertaining teeth provided on the piston drum. Fig. 4 shows in detail the special construction of the tightening or packing members; Fig. 5 shows a modified or improved form of the latter, the two latter gures being drawn at a somewhat larger scale and showing cross sections of the said packing members, as well as of the adjacent parts such as cylinder, wall, piston, and cylinder head. Figs. 6, 7 and 8 are perspective sectional views of structural features shown in Figs. 1 to 5.

Referring to Fig. 4 the packing segment a having an angular section is held by its axial wing or flange engaging a groove t arranged in the piston drum t and receiving therein, as

above stated, the necessary tightening pressure by springs c arranged behind the said axial wing. The other flange is provided on its entire periphery with a large number of radially arranged grooves cl so that a toothing d is produced there which is made by axial shifting to mesh with a similar toothing f, g, arranged on the piston drum and angularly shifted in a corresponding manner with reference to the first named toothing. Owing to this arrangement, the said engagement of packing segment and piston drum avoids during rotation the formation of a direct gap as the latter is divided into a large number of sections which are alternately shifted with reference to one another. Behind each sectional gap is always a plain tooth side which is tightly engaged with the corresponding supposite tooth side, thus preventing the tangential passage. The steam can only be forced through the gap by making a roundabout way t'. e. along the toothing. The division of the latter is furthermore chosen as small as possible so that at the place of contact between the drum and the cylinder i. e. at the tightening place r, the small channels which are theoretically produced in a temporary manner at the different gaps when transition takes place into the working chamber have practically no influence.

It is necessary to provide a tightening device constructed in a simple as possible manner and arranged at the inner joints of the said segment so that the steam which always penetrates radially into the various teeth gaps, is prevented from arriving behind the segment and to finally escape in larger quantities at the inner guiding surface. Fig. 4 shows a sectional view of such a construction of the above described packing segment which responds to the above stated requirements. The general arrangement of this segment on the wing piston is shown by Fig. 2, left hand side. The springs used for tightening purposes in this construction instead of being axially arranged, are mounted so as to exert a radial action; in fact, their effect is transformed for axial pressures by circular inclined planes arranged on the piston drum and on the segment behind the toothings the efforts of the said springs being first transmitted to a segment engaging like a wedge the said inclined planes which are oppositely directed.

In Fig. 5, 7L designates the annular mem- CIT' ber having two beveled surfaces and receiving theaction of the above said elastic force. This annular member is tightly applied on one side to the correspondingly formed walls of the piston drum and on the other side to the walls of the main segment a behind the toothings d, e, f, g. The outwardly directed elastic forces of the springs c which are radially distributed in a large number over the circumference of the ring h exert in this arrangement on both sides also reactional pressures which act perpendicularly to the direction of the force proper; the spreading action of these pressures produce then the tightness in the axial direction of the whole structure on the surface of the adjacent cylinder head. The radial tightness is naturally obtained under the influence of the produced lateral pressures exerted on the conical surfaces of the packing ring 7L. Matters are still simplified. and improved here by the toothing cut out along the drum periphery and alternately directed about perpendicularly to the direction of the opposite inclined surface. VJ ith a view of utilizing the forces of the same springs as well for tightening purposes at the inner guiding surface the said springs are inserted into the packing ring itself t'. e. between the wedge shaped packing ring la and that flange of the packing ring a which engages the piston drum. In this place the tension of the springs act in both directions; the force directed inwards is however greater by reason of its directly acting upon the ring so that the efforts starting from the point of support at the incline of the drum, also pressl the packing ring in a tight manner against the inner axially rotating guide wall. It is readily seen that the above described arrangement also sufliciently provides for tightness at the said inner guide wall.

Having now fully described my said invention what I claim and desire to secure by Letters Patent is:

l. In a rotary engine the combination with the cylinder, the cylinder heads and the rotary iston drum tangentially mounted inside tie said cylinder, of a packing ring (a) arranged at each of the extreme peripheral edges of the said piston drum and having a radially and an axially directed flange, the radial flange being adapted to contact with the inside surface of both the cylinder and the corresponding cylinder head, a concentric circular groove arranged in each of the extreme surfaces of the said piston drum and adapted to receive in sliding engagement the said axial flange of the corresponding packing ring, a toothing composed of radial triangular teeth provided on the inner side of the radial flange of the said packing ring, a toothing formed of similar radial triangular teeth provided on the corresponding extreme surface of the said piston drum between the peri heral edge and the said concentric groove of the latter and adapted to coperate in interlocking engagement with the toothing of the said packing ring, and a plurality of buffer springs inserted between the bottom of the said groove and the axial flange of the said packing ring and adapted to yieldingly press the latter against the surface of he adjacent cylinder head, substantially as and for the purpose set forth.

2. ln a rotary engine the combination with the cylinder, the cylinder heads and the rotary piston drum mounted inside the said cylinder in tangential engagement with the inside wall of the latter', of a packing ring (a) arranged at each of the extreme peripheral edges of the said piston drum and having a substantially radially directed flange and a substantially axially directed flange, the said radially directed flange being ada ted to con- 3 tact with the inside surface of bot the cylinder and the adjacent cylinder head, a concentric circular groove provided in each of the extreme surfaces of the said piston drum and adapted to receive in sliding engagement the said axial flange of the packing ring, a concentric inclined annular surface on the inside of the said radial flange of the packing ring, an inversely directed inclined concentric annular surface on the adjacent extreme surface of the said piston drum and adapted to form with the first named annular surface a triangular channel, a toothing formed of substantial radial teeth provided on the inner side of the said radial flange of the packing ring outside of the inclined annular surface of the latter, a toothing formed of substantial radial teeth provided on the corresponding extreme surface of the said piston drum outside the said inclined surface of the latter and adapted to coperate in interlocking engagement with the toothing of the said packincr ring, a wedge shaped packing ring arranged inside the said inclined surfaces and adapted to engage the said annular groove formed by 11@ the latter and a plurality of radial springs adapted to yieldingly push towards the periphery the said wedge shaped packing ring, substantially as and for the purpose set forth.

3. In a rotary engine the combination with 115 the cylinder, the cylinder heads and the rotary piston drum mounted inside the said cylinder in tangential engagement with the inside wall of the latter, of a packing ring (a) arranged at each of the extreme peripheral 120 edges of the said piston drum and having a substantially radially directed flange and a substantially axially directed flange, the said radially directed flange being adapted to contact with the inside surface of both the cylin- 125 der and the adjacent cylinder head, a concentric circular groove provided in the adj acent extreme surface of the said piston drum and adapted to receive in sliding engagement the axially directed flange of the said 130 packing ring, a concentric inclined annular surface provided en the inside of the radial flange of the said packing ring at a certain distance from the periphery ofthe said ange, an inversely directed inclined annular surface concentrically arranged on the adjacent extreme surface of the said piston drum and adapted to form with the said annular inclined surface of the radial packing ring flange a triangular channel having its apex directed outwardly, a teething provided en the inner side of the said radial flange of the packing ring between the said inclined surface and the periphery thereof and formed of teeth arranged substantially at right 'angles with reference to the said inclined surface of the said adjacent extreme surface of the piston head, a teething provided on the said extreine surface of the piston head between the annular inclined surface and the outer periphery thereof and formed of teeth arranged substantially at right angles with reference to the inclined surface of the said radial flange of the packing ring and adapted to ceoperate in interlocking engagement with the teething of the said radial flange, a wedge shaped acking ring having its apex directed outwardly and arranged inside the said inclined surfaces and adapted to fit into the annular groove formed by the said inclined surfaces and a plurality of radially arranged springs bearing at their outer ends against the inside of the said wedge shaped packing ring and at their inner ends against the outside of the said axially directed liange of the angularly shaped packing ring and adapted te yieldingly push the said wedge shaped packing ring outwards, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

FRIEDRICH CARL KRGER.

Witnesses:

BENJ. J. FULLER, ROBERT V. BLoW.