INDUCTION SYSTEM FOR ROTARY ENGINES, 2-STROKE AND OTHER ENGINES WITHOUT VALVES, WITH TRANSLATING THROTTLE SHUTTERS

Abstract: This patent application - worldwide - is for an induction system for internal combustion engines without valves, with the following characteristics and performances: improving efficiency and power output; providing total freedom in inlet header design (allowing telescopic headers, variable inlet header sections, plenum shapes, optimising ram tuning); with modular sandwich configuration, to be produced easily and cheaply, to be assembled and dismantled extremely simply, maintenance free.

Description: INDUCTION SYSTEM FOR ROTARY ENGINES, 2-STROKE AND OTHER ENGINES WITHOUT VALVES, WITH TRANSITING THROTTLE SHUTTERS. 1 . OBJECTIVES 1 .1 . TURBULENCE IN THE AIR-FUEL MIXTURE FLOW. This induction system is designed to produce turbulence in the inlet flow (air or air-fuel mixture), caused by the sharp cross-section cut-off of the inlet channels by the translating (horizontally, vertically, or diagonally) throttle shutters. This design allows positioning of the throttle valves as close as possible to the combustion room, which maintains a maximum of the originated turbulence into the combustion space. The effect of this concept can be compared to the favourable effect of the piston engine valves on creating of turbulence in the air-fuel flow, and on the thorough mixing of fuel and air. This induction system thus reduces the slight thermodynamic efficiency deficit of the rotary engine, compared to the piston engine. 1.2. FREEDOM OF DESIGN OF THE INLET DUCTING This design aims for a maximum of freedom in inle header configuration, which in turn allows for optimu ram-tuning. The shape of the air channels between the airflow senso of the injection system, and the engine with the translating throttle shutter system sticked right against it, is totally free. Even telescopic headers, adapting lenght to engine rev, or headers with variable cross section can be used with this induction system. The most fancy plenum-shapes are allowed. 2. FEATURES 2.1 . SIMPLICITY, EASE AND ECONOMY OF PRODUCTION This induction system is a sandwich construction of extreme simplicity. The configuration is modular. Components are either mass produced items (small roller bearings, airpot pneumatic cylinders f. , alu P40 & P60 threaded studs & nuts & washers), or easily produced parts (machined from Alu-alloy or other plate for small series, or Alu-alloy, Zamac or other precision cast, or precision formed in polymer for big series). Several alternative translating mechanisms can be adopted: linear bearings, miniature load transfer balls, air cushion, etc. The sealing & actuating cylinders can be either pneumatic or hydraulic. They may even be replaced by a seal on the actuating rod, and a small frame supporting the actuating wire force. Adding a seal on the actuating rod, the cylinders can be actuated both ways. 2.2. EASE OF MOUNTING, REPAIR, DISMANTLING, AND ENGINE INSPECTION. The system is sandwiched by threaded studs against a solid back-plate which closes the engine cooling circuit ^ watertight. All the superposed components can easily be dismantled (without draining the engine coolant), to allow visual inspection of the rotor apex seals, or : segments, f.i. The induction system itself is maintenance free and seldom or never needs inspection. In case of an accident (by an exterior impact) only the damaged components need to be changed. 2.3. INCREASED POWER OUTPUT, EXCELLENT IDLE RUNNING. _ _ ^ _ Power output at all revs is superior to conventional carburetor or injection induction systems. Throttle response is instant. Idle running is perfectly stable at 800 RPM. Idle air adjustment is very concise. 3. DESCRIPTION See the drawings: INDUCTION SYSTEM FOR ROTARY ENGINES, WITH TRANSLAΗNG THROTTLE SHUTTERS. 01. SAMPLE ASSEMBLY ON MAZDA 12 A ENGINE. 02. SHUTTER VALVE FOR 1 ΛRY INLETS. 03. SHUTTER VALVE FOR 2 ΛRY INLETS. 04. IND UCπON SYSTEM BACK PLATE-DETAILS. The primary inlet shutter, common to the two rotors, is opened first to feed the air-fuel mixture at low revs and power. Its actuation is direct by a steel wire connected to the throttle pedal (via a throttle box eventually) or to an electric actuator controlled by the engine computer, or-- through engine computer applied vacuum. The secondary inlets open when the flow through the primary becomes insufficient with respect to the power demand. ___ Their control is either direct through wire operation, from a cable lever arrangement, or through wire or vacuum operation, engine computer controlled, Q∑ automatic, through venturi vacuum at the primary inlets, connected to the space over the secondary pneumatic cylinder pistons. In this case, the pneumatic cylinder size (φ) and ύ nubber spring force are selected to optimise the engine 's operation.

Claims: CLAIMS The patent applied for should protect all of the followi features of the Induction System : 1. The thin, flat, translating shutters, positioned as close possible to the combustion room. The purpose is to improve the mixture process of air a fuel, and the combustion process, through increas turbulence reaching into the combustion space. 2. The shutters are of aflat shape, and of minimum structu thickness, differing in this from the cylindrical or flatten cylindrical shutters used in motorcycle engine-carburetor These shutters are easier and cheaper to produce, and a not subject to wear, contrary to the cylindrical ones. Their thermodynamic effect is superior. 3. The sealing (from secondary air) of the system is by extr posed pneumatic or hydraulic cylinders. The use of these cylinders can be extended to actuating the shutters. Primary, secondary and further inlets can be controll individually, contrary to existing translating thrott . systems. 4. The sandwich conflguration which makes the system ve easy and cheap to manufacture, install, maintain, inspe & repair. 5. This system can be manufactured from several kinds materials : metals and alloys ((precision) cast and/ machined), agglomerates, relatively heat resista polymers, etc...

Inventors: DECLERCQ PAUL EUGENE ALOIS, DECLERCQ, PAUL, EUGENE, ALOIS
Applicants: DECLERQ PAUL E A, DECLERCQ, PAUL, EUGENE, ALOIS
Application year: 1990
Main classification: F02D9
IPC codes: F02B53, F02B75, F02D9