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Title:
IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON
Document Type and Number:
WIPO Patent Application WO/2006/133527
Kind Code:
A1
Abstract:
The improvement to internal combustion engine with rotating piston comprises a rotor (1), one body (2), with covers (3), one rotor's separating ring (4) and a camshaft (5). Rotor (1) has the shape of a flat tube with cross section of an extended circle defined as an epitrocoidal profile. The body (2) has the external shape of a tube with an internal cavity (21) that is divided into three work chambers (22), each one with the shape of a cylinder segment and intercalated by three lobules (23). The rotor's covers (3) have a central opening (31) where the separating ring (4) is coupled, having a gear (41) that guides the rotor spinning motion (1). The covers (3) further have three long manifolds (33) for the intake of the combustible gases and for the exhaustion of the combustion gases. The separating ring (4) connects the camshaft (5) and the rotor (1), allowing the rotor (1) to be hollow. In one of the sides, the separating ring (4) has a pinion gear (41) that is coupled to the sprocket (32) of the engine's cover (3). The mounting process between the separating ring (4) and the rotor (1) is made by interference. A sealing system between the chambers (22) and the rotor (1) impede the lateral escaping of the combustion gases from one chamber to the other, considering that the pressures in each one of these chambers is altered at the extent in which the rotor (1) spins. The sealing system consists of a stem (24) coupled to a base positioned in the vortex of the lobule (23) of the body (2), which defines the ends of the chambers (22). Optionally, the engine can present a second stator (7) with the shape of a triangular prism and walls arched outwards, forming three lobules in angle, which, when spinning, defines simultaneously the internal chambers (8), doubling the engine's power.

Inventors:
MIRANDA JUNIOR MARIO RIBEIRO
Application Number:
PCT/BR2006/000114
Publication Date:
December 21, 2006
Filing Date:
June 14, 2006
Export Citation:
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Assignee:
MIRANDA SARAH OLIVEIRA RIBEIRO (BR)
International Classes:
F01C1/10; F02B53/00
Foreign References:
DE10348294A12005-05-19
JPS5698501A1981-08-08
US3920359A1975-11-18
GB964083A1964-07-15
Attorney, Agent or Firm:
Rosenstengel, Luiz Alberto (128 -030, Porto Alegre/RS, BR)
Download PDF:
Claims:
CLAIMS
1. "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", characterized by having a rotor (1) with the shape of a flat tube, whose cross section is the one of an extended circle, best defined as a epitrocoidal profile; body (2) with the external shape of a tube with an internal cavity (21) that is divided into three work chambers (22), each one with the shape of a cylinder segment and intercalated by three lobules (23); two covers (3) of the engine, each one having a central opening (31) where the separating ring (4) is coupled, having a pinion gear (41) that guides the rotor spinning motion (1) and three long manifolds (33) for the intake of the combustible gases and for the exhaustion of the combustion gases; whereas the rotor (1) has a sprocket (11) that is coupled to the pinion gear (41), linking the camshaft (5) and guiding the rotor (1) spinning motion.
2. "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", according to claim 1, characterized by being the relation between the radii of generation of the profile of the rotor (1) of 9:1. "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", according to one of the claims 1 or 2, characterized by the engine has a sealing system between the chambers (22) and the rotor (1), consisting of a stem (24) coupled to a base positioned in the vortex of the lobule (23) of the body (2), that defines the ends of the chamber (22). "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", according to one of the claims 1 , 2, or 3 above, characterized by the engine has a second stator (7) that is internal to the rotor (1) and (1) has the same shape of extended tube, whose wall defines simultaneously, when spinning, also three internal chambers (8), fulfilling equally the sequence of the aspiration and compression, ignition (explosion), expansion and exhaustion cycles. "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", according to claim 4, characterizes bv the internal stator (7) has the shape of a triangular prism with walls arched outwards, forming three lobules in angle (71) with the sealing system also through the stem (72), considering that the cover (3) presents three other openings (33) of intake of fuel and exhaustion of the combustion gases into the internal chambers (8). "IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON", according to claim 1 , characterized by the rotor (1) transmission system with the camshaft (5) optionally consists of a sliding bearing between a circular manifold (11') in the wall of the rotor (1) and a cam (41') of the shaft (5).
Description:
"IMPROVEMENT IN INTERNAL COMBUSTION ENGINE WITH ROTATING PISTON "

This invention refers to an improved internal combustion engine with rotating piston, that presents the external shape of a cylinder with a internal cavity that is divided into three layers, each one with the shape of cylinder segment and intercalated by three pointy lobules, and the piston presents the shape of a flat tube with cross section of an extended circle defined as a epitrocoidal profile.

Internal combustion engines with alternative pistons have been increasingly used for over a century without changes to the basic characteristics of the inventions of Otto and Diesel. The rotating piston engines, such as those of Wankel type, have been produced for various decades in series.

Internal combustion engines with alternative pistons, despite the advantages offered in relation to the other forms of generation of power, such as cost per kW installed and widely mastered technology, present negative characteristics inherent to their functioning, mainly in regard to vibrations, low performance, atmospheric and sound pollution, and unfavorable weight/power ratio.

On the other hand, the rotating piston engines have been designed to resolve such inconveniences, proposing to suppress the vibrations, increase the weight/power ratio and to work at high temperatures. However, these theoretical advantages have not been consolidated in practical terms, still resulting difficulties in the sealing of the work chambers, difficulties of manufacture, and deficiencies concerning the thermal aspects of the combustion chamber.

Therefore, this invention has as objective an innovative rotating engine with a special geometry of the rotor and stator that is able to resolve the limitations of the state of the art. The rotating engine of the invention includes the following basic components:

- body (external stator);

- rotor (piston);

- body front cover; - body rear cover;

- camshaft.

The body defines the external stator and has the external shape of a

cylinder with an internal cavity that is divided into three layers, each one with the shape of a cylinder segment and intercalated by three pointy lobules.

The piston has the shape of a flat tube, with cross section of an extended circle, best defined as an epitrocoidal profile. The ratio between the radii of generation of the profile is 9:1. The piston, when spinning eccentrically inside the body, causes a variation in the volume of each one of the combustion chambers, thus operating successively the stages of a two-stroke [sic] internal combustion engine, which are aspiration and compression, ignition (explosion), expansion, and exhaustion. The front and rear covers are flat and seal the engine's body through specific joints.

When at the maximum compression position, the piston divides each one of the chambers into two volumes, being necessary two sparking plugs, each one at each end of the chamber. Thus, in one rotation of the piston occur 1 complete cycle in each chamber, which multiplied by 3 chambers will release 3 explosions, corresponding to the power obtained in a four-stroke engine and 12 cylinders of same capacity.

Optionally, the engine can present two stators: one is the body and the other is an internal stator, considering that the rotor, when spinning between these two stators, fulfills the cycle in external and internal chambers, each one with three combustion chambers. The internal status has the shape of a triangular prism with arched walls outwards, forming three pointy lobules. The front and rear covers of the body seal the internal and external chambers of the rotor simultaneously. With this type of arrangement, the engine can present three combustion chambers between the piston and the internal stator, or three external chambers between the piston and the body, or even in both situations, summing six combustion chambers. Thus, in one rotation of the piston, 2 full cycles would be completed in each chamber, which multiplied by 3 internal chambers and summed to the same number of 3 external chambers, would result 12 explosions, which corresponds to the power obtained in a four-stroke engine and with 24 cylinders of same capacity.

The invention can be better understood through the following detailed description, based on the attached drawings, as follows:

Figure 1 - front view of the rotor isolated; Figure 2 - front view of the body isolated; Figure 3 - front view of the rotor mounted inside the body; Figure 4 - front view of the body's cover; Figure 5 - front view of the rotor separating ring;

Figures 6 to 8 - front views of the engine with the rotor completely positioned inside each one of the three work chambers; Figures 9 to 11 - front views of the engine with the opening and closing stages of one of the intake and exhaustion manifolds of the engine; Figure 12 - front view in detail of the sealing between the engine's chambers;

Figure 13 - front view of another option of the engine with transmission activated by sliding between the rotor and the camshaft; Figure 14 - front view of another option of the engine with a transmission occurred through sliding between the rotor and the camshaft. Figure 1 illustrates, schematically, rotor (1) that has the shape of a tube, whose cross section is the one of an extended circle, best defined as an epitrocoidal profile.

Figure 2 represents, schematically, the body (2) that has the external shape of a tube with an internal cavity (21) that is divided into three work chambers (22), each one with the shape of a cylinder segment and intercalated by three lobules (23).

Figure 3 details, schematically, the engine mounted, with the rotor (1) completely positioned inside one of the work chambers (22) of the body (2).

Figure 4 show, isolately, one of the covers of the engine (3) that closes the work chambers (22). These covers (3) have a central opening (31) where the separating ring (4) is coupled, having a gear (41) that guides the rotor spinning motion (1), as detailed below in figures 5 and 12. The covers (3) further have three long manifolds (32) for the intake of the combustible gases and for the exhaustion of the combustion gases. Figure 5 illustrates the separating ring (4) that connects the camshaft

(5) and the rotor (1), allowing the rotor (1) to be hollow. In one of the sides, the separating ring (4) has a pinion gear (41) that is coupled to the rotor's sprocket (1).

The mounting process between the separating ring (4) and the cover (3) is made by interference.

Figures 6 to 8 represent the rotor (1) completely positioned in each one of the work chambers (22), respectively. Figures 9 to 11 detail the engine with the covers and the rotor (1) position at the moment of beginning of the opening of the intake and exhaustion (33) manifold of the upper chamber (22), the position of the rotor (1) at the moment of full opening and the position of the rotor (1) at the moment of full closing, respectively. In figure 9 the rotor (1) is at 60°, in figure 10 it is at 90°, and in figure 11 is it at 120°, representing the three major movements of the cycle in the upper chamber (22). These three major moments occur again in the right (22') and left (22") lowers chambers. In figure 9 begins the cycle of exhaustion of the upper chamber (22), such cycle ending in figure 10 and the aspiration cycle is beginning, while in figure 11 the compression cycle is the one beginning. Figure 9 shows the maximum compression of the left (22") lower chamber and figure 11 shows the maximum compression in the right (22') lower chamber. Thus, figure 9 shows the beginning of the exhaustion cycle of the gases burnt in the upper chamber (22), the end of the admission, the beginning of the compression cycle in the right (22') lower chamber, and the maximum compression and the ignition in the left (22") lower chamber. These cycles repeat in each one of the work chambers (22) at each cycle of the rotor (1). At the moment of maximum compression, the rotor (1) divides the work chamber (22) into two sub-chambers, thus requiring, for a better combustion, a sparking plug (6) in each end of the chambers (22).

Figure 12 details the sealing system between the chambers (22) and the rotor (1), in order to impede the lateral escaping of the combustion gases from one chamber to the other, considering that the pressures in each one of these chambers is altered at the extent in which the rotor (1) spins and the cycles succeed. The sealing system consists of a stem (24) coupled to a base positioned in the vortex of the lobule (23) of the body (2), which defines the ends of the chambers (22). It is possible to note in this figure the gearing of the pinion gear (41) of the separating ring (4) of the cover (3) with the sprocket (11) of the rotor (1).

Figure 13 shows in detail a constructive option of the rotating engine

invented, which may present a second stator (7) that is internal to the rotor and has the shape of a triangular prism. In this option, the rotor (1) maintains the same shape of extended tube, whose wall defines simultaneously, when spinning, also the internal chambers (8), fulfilling equally the sequence of the aspiration and compression, ignition (explosion), expansion and exhaustion cycles. The internal stator (7) has the shape of a triangular prism with walls arched outwards, forming three lobules in angle (71) with the sealing system also through the stem (72). In this option, the cover (3) presents three other openings (33) of intake of fuel and exhaustion of the combustion gases. Figure 14 shows a constructive option of the rotating engine of the invention, that may present a transmission system of the rotor (1) rotation to the camshaft (5) no longer by means of gearing between the sprocket of the rotor (11) and the pinion of the separating ring (41), but a sliding bearing between a circular manifold (11') of the internal wall of the rotor (1) and a cam (41') of the shaft (5).