WO2013038228A1

WO2013038228A1 - Six stroke internal combustion engine

Info

Publication number: WO2013038228A1
Application number: PCT/IB2011/003308
Authority: WO
Inventors: Akram Mohammed Abbashar GABORA
Original assignee: Gabora Akram Mohammed Abbashar
Priority date: 2011-09-18
Filing date: 2011-09-18
Publication date: 2013-03-21

Abstract

A 6-stroke, 3-piston internal combustion engine for general purpose. It is based on the 6-stroke principle founded by Samuel Griffin (1883 AD) in which there is two additional strokes (power (work) -stroke and a second compression stroke) in additional to the classical 4 strokes in order to minimize pollution and to increase the engine economy. It consists of 3 pistons within the cylinder block and 2 dual - compression - chambers (DCC). It works similar to the 4 -stroke engine but with two additional strokes as mentioned before. According to the DCC action: one of the power strokes generated is due compressed hot mixture of air and fuel (work), and this mixture shall be ignited later to generate the second power stroke (expansion).

Description

SIX STROKE INTERNAL COMBUSTION ENGINE

Description - The Gabora 6-stroke, 3-piston interna! combustion engine (G 63} is an intellectual property of Akram Mohd. A. Gabora which is based on the 6-stroke concept/principle founded by Samuel Griffin (1883 AD) in which there are two extra stokes (compression and power strokes) plus the classical (regular) 4-strokes in order to minimize pollution and increase the engine economy (lower fuel consumption) at the same time. There are many rival designs based on Griffin prototype, but none has been proved to be efficient enough to be commercially produced on large scale. The complete engine may require 6 or 8 pistons in order . to run smoothly which makes it huge and heavy weighted. - The G 63 consists of 3 pistons within the cylinder block and 2 dual- compression-chambers (DCC). It works very similar to the 4-stroke engine, but with two additional compression and power strokes. - There are two power strokes per revolution as shown in diagram 1, and according to the DCC action: one of the power strokes generated is due compressed hot mixture of air and fuel (work-stroke), which shall be ignited later, and the second power stroke generated is due actually ignited mixture of air and fuel (expansion-stroke). - The DCC consists of a central hollow cylinder contained within an outer hollow cylinder in a manner such that the two spaces formed are of equal volumes, and as shown in diagram 2: Both cylinders are thermally connected i.e. the DCC actually operates as a heat exchanger for ail mixtures of (air and fuel) which are compressed inside it. Ignition occurs in the outer space. - Due to the construction and the action of the DCC:

piston volume and clearance to the volume of the central cylinder within the DCC should be in the order of (10:1) or more if possible in order to minimize the loss in power production because some of the ignited mixture or the very hot mixture of air and fuel remains inside the DCC and does not go in whole to the piston, also the compression ratio (CR) of the piston should be within the same figure as well or even more (11:1) for example. - The estimated efficiency of the 6-stroke engine and thus the related reduction in fuel consumption for the same power generated was found to be around 60% compared to a classical (regular) 4-stroke engine, and the performance of the G63 is expected to be within the same figure as well. - Now for the presence of the 3-pistons and the 2 DCC, there are 12 valves in the 663 (4 valves per piston), the DCC may be part of the cylinder head or can be an outer part connected to the assembly by means of screws, i general the G63 is expected to be more efficient and more reliable compared to the other rival designs due its relatively light weight (only 2 DCC are involved in the process). The G63 requires no cooling system as well as all 6-sttroke engines for all compression and ignition actions occurs within the DCC, and it requires an ordinary oil system (wet slump type). Finally it is expected to be made as small as lOOcc capacity engine up to 3000cc capacity engine or more if possible, also it can be made i either on-fine design or in V-design (90- degrees). - Diagram 1 shows the action of the G63 in detail, with the definition of each stroke. The complete cycle consists of two revolutions with: 2- intake strokes, 4- power stroke, 4-compfession-stf ofces and finally 2- exha st strokes. Diagram 2 shows bot the sectional and longitudinal view of the DCC f om the inside and from the outside (all diagrams are sketches and not to scale) .

A c&mp&rison between the G

- In the 6 63 there are 2-power-strokes (work and expansion) per revolution, but in the Griffin prototype and thus all the rival designs there are 2-power-strokes in every 3-revof ution- for eac piston works individuall in the following manner intake-stroke, 1^st compression- stroke, power {expansion }-stroke, exhaust-stroke, power (work)-strofce and finally 2^nd compression-stroke.- But since eac power stroke can not last more than 180 degrees (half revolution} then there is a silent peak where the engine runs by the inertia of the fly-wheel only, So for the rival designs which are based Griffin prototype there is a need for 6 or S pisto per engine in order to enable the engine to run smootWy and perfectly which makes the engin cumbersome however its capacit is, and this limits the use of the 6-strokes engine in general- In diagram 3, we see the action of a 6-strokes l-piston model accordin to Griffin prototype in which there are 2-power-strokes every 3 revolutions,

- it should be noted that i all these engines and designs: ignitio occurs at 8 degrees before the ^Mtop-dead-center" as ordinary 4-stroke engines.

- Finally for all of the G 63 design it is mostly recommended that the DCC should be thermally isolated from the outside Le. each should has its thermal isolator (jacket) for better performance.

The Gabora 6-Stroke, 3-Piston Engine (G63) Sequence listing and tables relating there to drawings Definitions of Items in diagram (1)

(1) - (12) valve with associated number.

(13) - (14) DCC

(15) - (16) Ignition points

( 17) - (18) Exhausts gas out

(19) - (20) Intake of air and fuel mixture.

(21) - (23) Piston Head

(24) Internal Oil System (Wet Slump)

(25) Crank shaft

*Ignition occurs in the outer of DCC just after compression stroke in piston A.

* Again ignition occurs the outer space of DCC just after compression stroke in piston C.

The arrow (in the table) shows the direction of each piston during the stroke: down. |— up:† Definitions of Items in diagram (2)

(1) : Inner space.

(2) : Outer space.

(3) : Rc (Central Cylinder Radius)

(4) : Ro (Outer Cylinder Radius)

(A) ; Sectional view of the DCC: the two spaces have equal volumes Rc=0.707 Ro.

(B) : Longitudinal view of the DCC from the inside.

(C) : Longitudinal view of the DCC from the outside.

Definitions of Items in diagram (3)

(I) -(4): Valve with associated number.

(5) : Ignition.

(6) : Exhaust gas out

(7) : Air and fuel mixture in

(8) : Two concentric cylinders

(9) : Piston head

(10) : Cylinder block

(II) : Crank shaft

Note: the arrows in the table show the direction of movement of the piston.

Claims

The Gabora 6-siroke, 3-piston Engine (G 63)

Claims

1) The design and the operating method of the G 63.

2) The naming, description, definition, thermal isolation and the function of the dual-compression-chamber (DCC).

3) The positioning of the DCC as an external part mounted to cylinder head by screws and/or as an internal, part within the cylinder head between each group of valves with respect to each piston.

4) The crank shaft design: up-right, down-right, up-right (UDU) sequence.

5) The introduction of two DCC units to a 3-piston internal combustion . engine with the crank shaft design as mentioned in{3) above in order to have a smooth and even production and distribution of power strokes (expansion and work) according to the design and the operating method of the G 63.

6) The concept/principle of a 6-stroke, 3-piston economical internal combustion engine: the alternative theory, the mechanism (practical formation of parts) and the application.

7) All the components and/with its functions of the G 63 (including the 12 valves from above) in whole and/or in part and how the G 63 works.

8) The concept/principle of the complete cycle of the G 63 which consists of two revolutions in which there are: 2-intake-stroke, 2- 1^st compression-stroke, 2-power (expansion)-stroke, 2-exhaust-stroke, 2- power (work)-stroke and finally 2- 2 compression-stroke i.e. there are 6 strokes per revolution.

9) The use and making of the G 63 either in an on-line design and/or in a V-shape design.