WO2002075117A1

WO2002075117A1 - Rotary-piston engine

Info

Publication number: WO2002075117A1
Application number: PCT/NO2002/000072
Authority: WO
Inventors: Knut Ståle TENFJORD
Original assignee: Tenfjord Knut Staale
Priority date: 2001-03-02
Filing date: 2002-02-21
Publication date: 2002-09-26
Also published as: NO20011078D0

Abstract

Motorbase where a combination of constant and altered threadpitch and proportional alterations in the diameter of the threadtops and the diameter of the threadbottoms (11), (12), and the threadvolumes wandering over the changes during rotation, by bystanding alternatingly left-and right threaded screws, placed in a motor casing, gives the motorbase its function. In this way one inlet cycle can be achieved by one rotation, while each expansioncycle will require several rotations. Through this construction of the motorbase, the total volume of expansion will be larger than the volume of inlet, and one accomplishes one inlet for each rotation and several expansions for each rotation.

Description

Rotary-piston engine

Description

Motorbase as main part in a combustion engine, which has its origin in the screw pumps' construction and function. Mainly, the motorbase stands out from these, by having the screws' threadbottoms and threadtops going conicly proportionally against each other, with an increase of the threadpitch in the expansion part of the motorbase. In this, one accomplishes one inlet and several expansions, and a larger volume of expansion than, volume of inlet per revolution. The motorbase consists of screws which lay by each other, and where the threads on each screw interacts with the other screw. The screws are alternatly right- and left threaded. The threadtops on the screws matches any position in the threadbottom on the interacting screw in the matching revolutionangle. The threadflanks of the screws fit in all the revolutionangles in a line from center to center of the screws, so that they match each other. The screws are put into a motor casing, drilled and adapted to the screws external form and dimension. The screws are supported by bearings in both ends and are attached with cogwheels or similar (8), so the screws during revolution do not touch each other at any point. The ends of the motor casing is constructed with openings for inlet and outlet (10), (9).

The first motorfase is the inletfase of the motorbase. The extent of this fase is one thread and is repeted for each rotation of the screws. It goes from (1) to (2). In this fase, the diameter of the threadtopps and threadbottoms is constant. The second fase is the fase of compression in the motorbase. The extent of this fase is one or several treads. In my example the extent is two threads from (2) to (4). From (2) to (3) the diameter of the threadtopps descends, while the diameter of the threadbottoms ascends. From (3) to (4) the diameter of the threadtops and threadbottoms is constant. The third fase is the fase of expansion in the motorbase. The extent of this fase can be one or several threads. In my example from (4) to (7). From (4) to (5) the diameter of the threadtops and the threadbottoms is constant. From (5) to (6) the threadpitch increases, and the diameter of the threadtops ascends and the diameter of the threadbottom descends. From (6) to (7) the diameter of the threadtops and threadbottom is constant while the threadpitch may continue to increase.

The combination of a constant and altered threadpitch and the proportional alteration of the diameter, of the threadtops and the threadbottoms, leades to the threadvolumes compression/expansion whilst they wander over the changes during revolution. These are the factors which give the motorbase its function. In this way, one inlet cycle may be accomplished by each rotation of the screws, while one expansion cycle take several rotations, in my example approximately 3,5 rotations. This gives the screws 3,5 expansions and one inlet for each rotation. Through this construction of the motorbase, the total volume of expansion will be larger than the total volume of inlet. One acchieves one inlet for each rotation and several expansions for each rotation. Three patents where parts of this technology is known:

In EP 0 842 721 Al, a method for production of stright rotors are described, where the rotors are formed by coned screws.

In FI 104440 B a screw pump where the screw's diameters are altered along the longitudinal axis is described.

In DK 146861 B a screwrotormachine with two paralell cooperating spindles is described. The direction of thread on each of the spindles is altered at the center of the longitudinal axis, and is oposite on each of the spindles. Each spindle consists of two screws with increasing/decreasing thread pitch and thread diameter. Depending on the direction of turn, the machine will have an either compressing or expanding function.

Mainly, my invention deverses from these patents by it beeing constructed as a combustion engine. It has, during function revolution, the three fases inlet, compresion and expansion. Further, the invention alters between a constant thread pitch and an increasing thread pitch.

Claims

Patent claims

1. Motorbase where screws, left- and right threaded in turn, interact with each other, for sealing beetween themselves and against the walls of the motor casing, characterized in that the diameters of the threadtopps and threadbottoms may be constant and may be altered proportionally against each other in a conical pitch to accomplish first fase inlet (1), (2), and second fase compression (2), (3), (4) and third fase expansion (4), (5), (6), (7), and that the threadpitch increases / is larger in the third fase the expansionfase (5), (6), (7) to accomplish a larger volume of expansion than volume of inlet.

2. The motorbase in accordance with claim no. 1 , is characterized by that the pitch between the screws in the diameter of the threadbottoms and the threadtops in the expansionfase and the compressionfase (11), (12), together with the threadpitch determine how many threads the fases take.

3. The motorbase in accordance with claim no. 1, is characterized in that the threadwidth may be equal or different on the interacting screws (13), (14).

4. The motorbase in accordance with claim no. 1, is characterized by that the screws are connected by cogwheels or similar, thus they under rotation not at any point will touch each other (8).