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Gianni A. DOTTO

ROTARY ENGINE











400 Horsepower / 36 Kg, continuous firing (no ignition system), reduced wear, cooler temperature.


S.T. #5 (1974) --


400 HP from an 36 Kg engine !

 ”So far, nobody can declare that the Rotary Engine could substitute the traditional combustion engine, but everybody knows that latter is undoubtly exceeded by the Rotary Engine at least in the matter of engine variants, designed and even made in the last decades.

Here is one more interesting variant of Rotary Engine, which constitutes an real record in this matter, with an specific power of min.11 HP / Kg, given about 2,5 HP / Kg as the medium amount of the classic combustion engine. We are talking about the invention of G. A. Dotto and W. L. Linn; they have eccentrically installed into an elliptical chamber, a rotor-device which forms 16 partitions, using also 16 dividing mobile walls. Because of the eccentricity of the rotor during its rotational movement, the volume of the active chambers is variable. The position of the dividing walls – which must remain permanently in contact with the inner surface of the body – is very precisely stabilized by a cam which is mounted inside the rotor, in the middle of the rotor shaft.

The engine supply with air and oil is made by pping inside the stator. The mixture air / oil at low pressure is sent by an axial blower which is mounted on the shaft. After the mixture in-take, the volume of the combustion chamber gradually decreases, than the pressure reached the
maximum amount and the mixture is ignited and it burns simultaneous with the combustion chamber enlargement during the gases expansion. The moment choosen for ignition is unusual, compred to regular combustion engines, which make the ingnition before the mixture reaches the maximum pressure. In a very short time after the ignition, the combustion gases are exhausted through the stator wall. That engine seemes to be perfect for the applications which require big diriving : automobiles, helicopters, ships and aircrafts. The inventors have specified that their Rotary Engine could develop 200 HP having just 20 centimeters in diameter.

This kind of rotary engine could be mounted directly on the propeller axle of the aircraft, or of the helicopter or ship, or even on the actuating axle of the automobile – however, that last application is unlikely. In the future, the inventors want to improve their engine by using the “diesel” combustion ( without igniters) with two parallel rotors,- the first rotor supplys the second rotor with compressed air and the second rotor become the real driving unit of the engine.

Well, the inventors want to make this improvement because the first variant of their rotary engine- although develops an record power at 5000 round/min and could work even at 18.000 round/min – under 1000 round/min, its driving-couple is almost nill.”

Captions:

“ The rotor of the new engine has this complicated design, with numerous oriffices for the sealing gaskets, for the mixture turbulence and also cuttings for the dividing wall. (a)

That rotor is eccentrically mounted into an light body which has a elliptical inner surface ; the stator walls are endowed with pipes for supply and exhaust and with the igniters. (b)

After the assembling, the engine is cylindrical and compact and we can see the igniter wire, the supply axial blower and the exhaust pipe (c).”


US Patent # 3301233
Canadian Patent # 793047
British Patent # 1067889 

Rotary Type Engine

( 8-27-1968 )

The present invention relates to an internal combustion engine, more particularly to a rotary internal combustion engine. The rotary internal combustion engine includes several novel means and methods such as continuous firing of an explosive fuel and air mixture in an explosion space thereby eliminating the need for a continuous spark or a continuous ignition system, vanes that ride in close proximity to an inner periphery of a cylinder, notched configurations in a rotor’s periphery and slotted portions formed in the inner periphery of the cylinder to obtain a more advantageous mixture of fuel and air, combustion of the fuel and air mixture in a decompression portion of a firing cycle to thereby obtain a cooler running engine without sacrifice of horsepower developed by the novel rotary internal combustion engine, and a ring means or a camming surface and bearing cooperatively associated with each individual vane to predeterminately locate the vane with respect to the inner wall of the cylinder to thereby substantially reduce wear.

Rotary internal combustion engines are known and are successfully utilized to provide a driving means for tools, machines, and any other types of machinery that demand a uniform and a constant output of energy in order to be efficiently actuated. The rotary internal combustion engine may be utilized as a means for propelling automotive means and would necessarily be equipped with a suitable transmission. Within the broad field of rotary internal engines, the need exists for a light weight engine that is cooler running than is the conventional rotary internal combustion engine; the need exists for an internal combustion engine that eliminates the need for a means that develops a continuous ignition spark; and the need exists whereby the internal wear of the rotary internal combustion engine is substantially reduced thereby promoting greater engine efficiency and longer engine life.

Several presently available rotary internal combustion engines include vane means that engage with the cylinder wall thereby increasing wear at the point or points of engagement. Typically, these engines include a continuous spark ignition system for each pair of vanes substantially seal their associated portion of a circular cylinder. Several of the presently available rotary internal combustion engines ignite the fuel and air mixture during the compression portion of the cycle whereas the present invention provides a means for igniting the fuel and air mixture during the decompression portion of the cycle thereby allowing the engine of the present invention to operate at a substantially cooler temperature without any substantial sacrifice in power developed by the engine. It is seen that the present invention provides a simple, effective, and efficient rotary internal combustion engine. By the accompanying drawings and specification, the novel means and method whereby the present invention fulfills the required purposes will be disclosed.


Dotto's Automobile Patents

Rotary type engine
US3301233
1967-01-31

IGNITION BREAKER
CA803018
1968-12-31

HYDRAULIC BRAKES
CA798137
1968-11-05

ROTARY TYPE ENGINE
CA793047
1968-08-27

DISC BRAKE
CA752208
1967-02-07

AUTOMATIC BRAKE ADJUSTER
CA740274
1966-08-09

BRAKES
CA735256
1966-05-31

BRAKES
CA711581
1965-06-15

HYDRAULIC BRAKES
CA685277
1964-04-28

BRAKES
CA669412
1963-08-27

DISPOSITIVO DI COMANDO DESMODROMICO PER VALVOLE IN PARTICOLARE DIMOTORI VELOCI
IT1216568
1990-03-08

MOTORE ALTERNATIVO PLURICILINDRICO A VAPORE
IT1173355
1987-06-24

Reciprocating steam engine
EP0070348
1983-01-26

MOTORE ALTERNATIVO A VAPORE
IT1129781
1986-06-11

CAPACITOR DISCHARGE IGNITION SYSTEM
US3453492
1969-07-01

Ignition system for an internal combustion engine
US3382407
1968-05-07

AUTOMOTIVE SEMICONDUCTOR IGNITION CONTROL APPARATUS
US3437876 - 1969-04-08




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