The power transmission mechanism of the rotary piston engine known from the pat- ent paper FI 93483 is different in the power stroke than in the following stroke and the function of the power transmission device varies such that the more efficient torsion of the torsion bar, which is the power transmission device, is directed to the axle on every second stroke of the piston and successive torsional strokes on the axle will appear by synchronizing at least two engine section.

The variation of the functioning mechanism of a power transmission device causes fast wearing of parts moving with regard to each other, malfunction and waste of operating energy. The place of the point of support of rotation of lever arm con- struction of the piston is unstable, which weakens the stability of the rotating mo- vement of the torsion construction of the piston and causes variation of angular ve- locity of the moving piston in the middle of a stroke.

The object of the invention is to eliminate these disadvantages and to improve the durability, reliability and the total efficiency of a rotary piston engine. Further, the object of the invention is to provide a rotary piston engine the power transmission mechanism of which provides a transmission of known magnitude and known direc- tion between a rotary piston and an axle.

The object of the invention is accomplished by arranging the strokes of the angles of the rotary piston, moving in alternate strokes, on immediately successive paths symmetrical with each other such that on the created section of the path the angular velocity of the angle of the piston is constant while moving the piston at constant speed of rotation. An angulated power transmission frame has been connected to the piston of the rotary piston engine in accordance with the invention, the path of the angles of point of which follows the path of the angles of the piston and the power transmission axle has been attached on bearings to the attaching point on the extension part of the bisector of the cylinder chamber such that the frame of the cy- lindrical wheel placed in the axle reaches the power transmission frame. In the power transmission device of the rotary piston engine there may be a rotating axle, which is not parallel with the centre axis of the piston.

More exactly said, characteristic to a rotary piston engine in accordance with the in- vention is what has presented in the characteristic part of claim 1.

Next, the invention will be explained in more detail with reference to the accompa- nying drawings, in which, Figure 1 illustrates an application of the first alternate stroke of the piston of a ro- tary piston engine in accordance with the invention, which stroke has been gener- ated by flow pressure, enlarging and expansion of medium, in hollows enlarging by volume between the cylinder chamber and the piston wall, Figure 2 illustrates an application of the second alternate stroke of the piston of a ro- tary piston engine in accordance with the invention, Figure 3 illustrates an application of defining in coordinates the points of support of rotation of the piston of the rotary piston engine in accordance with the invention and the shape of the walls of the cylinder chamber and the placement of flow open- ings and grooves of medium in the cylinder chamber, of the piston and the power transmission device in the starting point of the first stroke and of defining in coordi- nates the shape of the power transmission device touching the cylindrical wheel in the axle, and Figure 4 illustrates an application of the connection of the cylindrical wheel in the axle of the rotary piston engine in accordance with the invention, of the contact points in the power transmission frame with the cylindrical wheel, of the connection of the power transmission frame with the piston and of the connection of the cardan shaft with the power transmission frame.

In figures there are the piston 1, the wall frame 2 of the cylinder chamber, the axle 3, the power transmission frame 4, the contact frame 5 in the axle, the interconnec- tor 6, the flange 7 of the power transmission frame, the cogging 8, the shoulders 9 of the power transmission frame, the sealing bearings 10 of the piston, the cardan joint 11, the cardan shaft 12 and the hoods 13.

In the first alternate stroke the piston 1 is moved round the axle of support of rota- tion at the point P, the path of the piston angles follows the walls of the wall frame 2 in the cylinder chamber and there are two enlarging and two reducing chambers in the cylinder chamber. Outlet and inlet flows of medium have been arranged through valve openings and grooves on the walls of the cylinder chamber.

In the second alternate stroke the piston is moved round the axle of support of rota- tion at the point PI, and the path of the piston angles follows the other walls of the

wall frame 2 of the cylinder chamber and there are two enlarging and two reducing chambers in the cylinder chamber.

In both strokes the paths of the angles of the piston have been concentrated to the point of support of rotation P or PI by forming each path to an arc of a circle and by forming the wall frame 2 of the cylinder chamber including the rotation path of the angles of the piston such that the halves of its cross-section figure are symmetrical among each other in regard to the centre axis. The power transmission frame 4 and the cylindrical wheel 5 in the axle are placed to touch each other by forming to the wall between the angles of the power transmission frame connected to the piston projecting surfaces 9 as sectors of the cylinder by shape and with radius r, the length of which equals with the length between the piston and the point of support of rota- tion P or PI of the power transmission frame 4 and the path curve being tangent to the cylindrical wheel 5 and included in the same half of the rotational path. The axle 3 has been attached with bearings to the point P2 on the extension part of the bisector of the cylinder chamber 2 such that the frame 5 of the cylindrical wheel in the axle reaches the wall parts A-A1 and A1-B and to the shoulders 9 of the power transmission frame 4. In the touching frames, there is a cogging 8. The flange 7 of the power transmission frame has been connected fixed to the piston 1 with the in- terconnector 6. The middle points of the piston 1 and the power transmission frame 4 are placed on the same axis at the point P3 and their diagonals of the same length are placed one upon another. Sealing bearings 10, touching the walls of the cylin- der chamber 2 and bearings in the power transmission device act as running support of the movements of the piston 1. In the situations in figures 1-3 the filling cham- bers have been marked with an open arrow and emptying chambers are marked with an enclosed arrow. In the application in figure 4 there are two driving axles, the one of which 12 is not parallel with the centre axis P3 of the piston 1.

In accordance with figures 1 and 2 the path of the points of the angles of the piston 1 is the wall frame 2 of the cylinder chamber and the position of the piston in each situation controls the pressure and vacuum in the chambers of the cylinder chamber through valve openings and grooves. The transmission of the moment between the piston 1 and the axle 3 has been arranged through shoulders in the contact frame 5 in the axle 3 and the power transmission frame 4 such that the surface pressure from the in coming kinetic energy moves the part to which the kinetic energy is directed.

In accordance with figure 3 the shape of the wall frame 2 of the cylinder chamber is a figure formed of arcs of a circle A-A1, A1-B, B-B1, Bl-C, C-C1, C1-D, D-D1 and D1-A. The flow of medium has been arranged by an opening, which is placed

at the point D1 on the wall and by grooves, which are on sections A-A1 and C1-D on the wall, as well as by another opening, which is placed at the point Bl on the wall and by grooves, which are on sections A1-B and C-Cl on the wall. The axle 3 is placed at the point P2 on the extension of the bisector of the wall frame 2 of the cylinder chamber on bearings such the frame 5 of the cylindrical wheel reaches the shoulders 9 on the power transmission frame 4, which shoulders have been formed on each side two in succession with the same radius r and with the same coordinates as the sections A-A1 and A1-B of the wall frame 2 of the cylinder chamber.

In accordance with figure 4 the frame 5 of the cylindrical wheel on the axle 3 touches the power transmission frame 4 connected fixed to the piston 1, between the flange 7 of which power transmission frame and the piston 1 there is an intercon- nector 6. The cardan shaft 12 has been connected by a cardan joint 11 to the power transmission frame 4.

The figure, in accordance with the application in figure 3, marked with eight curved lines and illustrating the cross-section of the path of the points of the square like pis- ton and the wall frame of the cylinder chamber and the halves of which figure are symmetrical in regard with the middle line, is formed as follows: The starting point for the first stroke is the situation when the angles of the square piston are placed at the points of recesses A and B and shoulders C and D of the wall of the cylinder chamber. While the piston is moved round the point P 45 de- grees to the right the paths of the piston angles are placed on the sections A-A1, B- Bl, C-C1 andD-D1 ofthewall.

The starting point of the second stroke is the phase, when the piston angles are placed at the points recesses B1, C1, and D1 and shoulder A1 of the wall of the cyl- inder chamber, while moving the piston the second stroke 45 degrees to the right round the point P1 the paths of the piston angles are placed on the sections A1-B, Bl-C, Cl-D and D1-A.

The wall sections A-Al and A1-B of the cylinder chamber of the rotary piston en- gine in accordance with the invention are symmetrical with each other and a section of rotation path has been formed of them, on which section the angular velocity of the piston angles is constant. Similarly, the wall sections C-C1 and C1-D are symmetrical with each other. The angular velocity of the angles of the power transmission frame attached fixed to the piston is constant on the previously men-

tioned section. As the motions of the piston are alternate strokes of 45 degrees the speed of rotation on the centre axis of the piston is constant.

In the application in accordance with figure 3 the symmetry axis of the wall frame of the cylinder chamber is the same line as the y-axis of the system of coordinates.

The coordinates of the points of support of rotation are in millimetres: P:-22, 11/9, 16, P 1 : 22, 11/9, 16.

Sections of the wall frame, formed as a 45 degree arc of a circle point P as the cen- tre point by shape, are: A-Al, the length of the radius 65,40, the coordinates of the point A-50, 00/68, 32, the coordinates of the point Al 0, 00/ 70, 71; B-Bl, the length of the radius 93,27, the coordinates of the point B 50, 00/ 68, 32, the coordinates of the point B 1 70, 71/ 0, 00; C-C1, the length of the radius 82,87, the coordinates of the point C 50, 00/-31, 68, the coordinates of the point Cl 0,00/-70, 71 and D-D1, the length of the radius 49,46, the coordinates of the point D-50, 00/-31, 68, the coordinates of the point D1-70, 71/ 0, 00.

Sections of the wall frame, formed as a 45 degree arc of a circle point P1 as the cen- tre point by shape, are Al-B, the length of the radius 65,40, B 1-C, the length of the radius 49,46, Cl-D, the length of the radius 82,87 and D1-A, the length of the ra- dius 93,27.

In the walls of the power transmission frame a pair of shoulders of the shape of sec- tions A-A1 and A1-B is formed; the length of the radius of both parts is 65,40.

In the cylinder chamber formed with mentioned parameters fits a square rotary pis- ton the length of which diagonals are 141,42 mm. The length of the diagonals of the power transmission frame connected fixed to the piston equals with the length of the diagonals of the piston. It is natural that in different applications of the inven- tion different parameters of parts may be used and that, for example, the shape of the wall of the piston may differ from the shape of the walls of the power transmis- sion frame.

In accordance with the idea of the invention the piston 1 is moved either with a pressure effect of medium, for example vapour, or with kinetic energy from axle 3, 12 or from both, in which case the medium is guided to the chambers of the cylinder chamber enlarging by volume through the inlet opening and the wall groove pre- sented in figures 1-3. Due to the groove, there will appear an opening in the cylin- der wall, through which the medium flows round the angle.

In accordance with figure 1 when the pressure or the kinetic energy from the axle 3 moves the piston 1 for 45 degrees stroke round the axle at the point P the medium fills the chambers enlarging by volume and the chambers reducing become empty.

In accordance with figure 2 when the piston is moved further a 45 degrees stroke round the axle at the point P1, the medium fills the chambers enlarging by volume and the chambers reducing become empty.

The power transmission frame 4 connected to the rotary piston 1 and the cylindrical wheel 5 in the axle 3 transmit the moment between the piston 1 and the axle 3 such that the surface pressure due to the incoming kinetic energy between the wall shoul- der 9 and the wheel frame 5 move that part, to which the kinetic energy is guided.

The operating axle may be a rotating axle 12, which is not parallel with the centre axis of the piston 1 at the point P3, and the fixing point to the piston 1 is at the cen- tre axis.

The invention is not limited to the presented application but it can vary within the frames of the idea of the invention formed in the claims. Therefore, the rotary piston and the power transmission frame connected with it may be triangular.

In accordance with one application of the invention, the rotary piston engine in- cludes at least two engine sections.

In one application of the invention, the hoods of the cylinder chamber have open- ings for valves and for lubrication.

In one application of the invention between the power transmission frame and the contact frame in the axle there is a friction power transmission.