Internal-combustion engines – Transmission mechanism from piston
Patent
1998-07-14
2000-08-01
McMahon, Marguerite
Internal-combustion engines
Transmission mechanism from piston
F02B 7300
Patent
active
060951109
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/FR97/02035 which has an International filing date of Nov. 13, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.
The present invention concerns internal combustion engines having at least one crankshaft attached to a power take-off shaft of the engine by a first rotating linkage system, a second crankshaft attached to a power take-off shaft of the engine by a second rotating linkage system, and concerns more particularly the engines intended to equip motorized ultralights (M.U.L.), autogyros, amateur light airplanes, hovercraft, hydrocraft, target drones, or the like.
A problem of utmost importance in this type of application in case of an engine failure is to ensure above all the safety of the pilots and eventual passengers, and to allow them to reach a stopping point with a maximum of safely. Another problem is to avoid the destruction of equipment due to incidents or accidents created directly or indirectly by engine failures. Consequently, a motorization for such applications must be very reliable and robust, while however remaining light, strong, and practical.
The object of the present invention is to propose a solution to the above problems and to incorporate other advantages. More precisely, it consists of an internal combustion engine composed of at least one crankshaft attached to the said power take-off shaft of said engine by a first rotating linkage system, a second crankshaft attached to the said power take-off shaft of said engine by a second rotating linkage system, characterized in that the said first rotating linkage system is reversible, and includes a first driving wheel which is completely attached in rotation to the said first crankshaft, via a first obstacle link capable of transmitting an engine load from the said first crankshaft toward the said power take-off shaft and capable of breaking, during a failure creating an immobility of the said first crankshaft, under a load that is inferior or equal to the load necessary to immobilize the said first crankshaft, and in that the said second rotating linkage system is reversible and includes a second driving wheel completely attached in rotation to the said second crankshaft via a second obstacle link being able to transmit an engine load from the said second crankshaft toward the said power take-off shaft and capable of breaking, during a failure leading to an immobilization of the said second crankshaft, under a load that is inferior or equal to the load necessary to immobilize the said second crankshaft.
The engine according to the invention can function in spite of the immobility of at least one crankshaft via a controlled breakage of the connection attaching the power take-off shaft to the immobilized crankshaft or which is intended to become immobilized following a failure, for example the seizing of a piston. In an engine according to the invention intended to equip a M.U.L. or the like, for example, the power take-off shaft that is interdependent with the propeller, will be able to continue to turn in spite of the immobility of a crankshaft, due to the effect of the engine torque created by the engine crankshaft or crankshafts that are not immobilized. Thus, the M.U.L. or the like will be able to reach a landing point safely, as opposed to having to suffer the uncertainties of a glide, in the case of the M.U.L., or fall, in the case of an autogyro for instance. It should be noted that the engine according to the invention can include advantageously more than two crankshafts.
According to an advantageous characteristic, the engine according to the invention has at least a third crankshaft in rotation, a third driving wheel, a third obstacle link.
This characteristic concerns an engine with three crankshafts, each attached to a power take-off shaft via an obstacle link that is capable of breaking. In the case of immobility of any of the crankshafts, the
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Benton Jason
McMahon Marguerite
LandOfFree
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