Title of Invention

SINGLE STROKE RECIPROCATING INTERNAL COMBUSTION ENGINE FOR AUTOMOBILES SUCH AS MOTOR BIKES

Abstract

A single stroke reciprocating internal combustion engine for automobiles such as racing motorbikes comprising. (i). a cylinder block (10); (ii). said cylinder block (10) comprising at least a pair of axially aligned cylinders (12) facing each other; (iii). said cylinders adapted for functioning as combustion chambers. wherein atleast a pair of piston (15) members connected by a rigid link (17), operate inside the cylinders in complementary relationship with each other.

Full Text

FORM 2 THE PATENTS ACT, 1970 (39 of 1970) COMPLETE SPECIFICATION [See section 10; Rule 13] SINGLE STROKE RECIPROCATING INTERNAL COMBUSTION ENGINE FOR AUTOMOBILES SUCH AS MOTOR BIKES; SANUP SUBHASH VAIDYA OF A-503, KESARI NANDAN CO-OPERATIVE HOUSING SOCIETY LTD., ASHOK VAN, DAHISAR (EAST), MUMBAI - 400 068, MAHARASHTRA, INDIA; PAWAN RAMESH RAJPUT OF 19, YOGESH, KASTUR PARK, BORIVALI (WEST), MUMBAI -400 092, MAHARASHTRA, INDIA; SACHIN SHANKAR RANE OF E-4, JAL DARSHAN APARTMENT, RIVER VALLEY COMPLEX, BORIVALI (WEST), MUMBAI - 400 103, MAHARASHTRA, INDIA; BHAVANA PRAVIN RAJPUT OF 201, HIMGIRI. SHIVSHAKTI CO-OPERATIVE HOUSING SOCIETY LTD., SANTOSHI MATA MANDIR ROAD, KURAR VILLAGE, MALAD (EAST), MUMBAI - 400. 097, MAHARASHTRA, INDIA AND ASHA BHANUDAS SHELKE OF SHELKE WADI, POST - SONGAON, TALUKA / DIST - SATARA, MAHARASHTRA, INDIA, ORIGINAL 939/MUM/2003 THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE NATURE OF THIS INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFOMED. GRANTED 21-7-2004 TITLE: SINGLE STROKE RECIPROCATING INTERNAL COMBUSTION ENGINE FOR AUTOMOBILES SUCH AS RACING MOTOR BIKES FIELD OF INVENTION: The present invention relates to the field of Internal Combustion engines. Particularly, the present invention relates to the field of single stroke reciprocating Internal Combustion engine for use in automobiles especially racing motorbikes. BACKGROUND ART: Conventionally, two and four stroke engines are used in automobiles such as passenger car and commercial vehicles. For automobiles such as racing motorbikes, use of two stroke engines have always been a preferred choice due to their ability to generate high power output. However, two and four stroke engines have several drawbacks which limit them from being used successfully in automobiles such as racing motorbikes. Such drawbacks include: (i) High power factor requirement (ii) space requirement (iii) balancing (iv) twisting of crank shaft (v) engine starting torque (vi) complex valve mechanism and . (vii) Flywheel design. Attempts have been made to provide a reciprocating engine which would overcome the drawbacks associated with two and four stroke engines and find successful application in automobiles such as racing motorbikes. One such engine is disclosed in Chinese Patent No. CN 1288102A entitled "single stroke piston type engine", by M/s. Jiang-AN Jing, China. The Chinese Patent No. CN 1288102A discloses a one-stroke Piston engine that features use of a reciprocating serial link structure, and is composed of dual-action cylinder, piston, piston rod, linking rod, crankshaft, distribution mechanism, cooling mechanism, lubricating mechanism, supply system and ignition system. The advantage of the engine being that four actions are performed in a single stroke. Eventhough the engine disclosed in the Chinese Patent No.CN1288102A would overcome the power factor problems associated with two and four stroke reciprocating IC engines, a need still exists for developing an engine which would not only offer high power factor but also overcome the problems of space requirement, balancing, crankshaft twisting, engine starting torque, complexity in valve design and flywheel design associated_with two and four stroke engines for successful application in automobiles such as racing bikes. Our inventors, by dint of determined research and intuitive knowledge have developed a single stroke engine which would overcome all the foregoing drawbacks associated with two and four stroke engines for successful application in racing motorbikes. OBJECTS OF THE INVENTION: Accordingly, the objects and advantages of the present invention are set out herein below: 1. An object of the present invention is to provide a single stroke reciprocating internal combustion engine wherein the engine is capable of delivering maximum power output for every half revolution of the crankshaft, thereby achieving a large power output with minimum space consumption by the engine. 2. Another object of the present invention is to provide a single stroke reciprocating internal combustion engine wherein the engine uses a simple valve mechanism to offer very high performance suitable for use in automobiles such as racing bikes. 3. Another object of the present invention is to provide a single stroke reciprocating internal combustion engine wherein the engine does not require a flywheel as there is no idle stroke. 4. Another object of the present invention is to provide a single stroke reciprocating internal combustion engine wherein the engine does not require a separate cam shaft as the cam is mounted directly on the crankshaft. 5. Another object of the present invention is to provide a single stroke reciprocating internal combustion engine wherein the engine offers high fuel efficiency as valve is used for intake system and port is used for outlet system. Other objects and advantages of the invention will become apparent from the description given herein. BRIEF SUMMARY OF THE INVENTION: The present invention discloses a single stroke engine which comprises a pair of axially aligned cylinders configured in a mutually facing relationship with each other preferably within a common cylinder block. A plurality of inlet valves, exhaust ports and a spark plug and cooling fins are provided individually in the cylinders for engine operation. A pair of piston members welded back to back using a T-rod, is configured reciprocatably inside the cylinders. The T-rod is connected to a connecting rod which inturn is connected to a crankshaft for conversion of reciprocatory motion of the piston into rotation of the crankshaft. Power is delivered for every half revolution of the crankshaft thereby generating maximum power output with minimum space occupied by engine. A wedge-follower mechanism coordinatingly articulated to the crankshaft and the valve follower rod enables actuation of the inlet valves by the crankshaft without need for a separate cam shaft. A more detailed explanation of the invention is provided in the following description and appended claims taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS: To complement the description that is being given and in order to promote a better understanding of the characteristics of the invention in accordance with a practical embodiment of the same and as an integral part of the said description a set of drawings accompany it in which, in an illustrative and non-restrictive way, the following are represented:- FIG1. shows the perspective sectional view of the single stroke engine according to the present invention. FIG2. illustrates the wedge-roller mechanism for operating inlet valve according to the present invention. FIG3. shows the schematic operation diagram of the engine according to the present invention. DETAILED DESCRIPTION OF THE INVENTION: A detailed description of the preferred embodiments and best mode for practicing the invention are described herein: The present invention discloses a single stroke reciprocating internal combustion engine suitable for use in automobiles such as racing motorbikes. The single stroke reciprocating internal combustion engine according to the present invention is adapted for working on Otto cycle and is capable of developing power for every half revolution of the crankshaft. The components and associated functional features of the engine will become apparent from the description given herein: FIG.1 In the embodiment shown, the engine comprises a cylinder block (10) having a pair of oppositely arranged cylinders (12) whose inner surfaces are machined to required accuracy and tolerance so as to allow substantial smooth reciprocation of a piston (15) shown in Fig1. The cylinder block (10) is preferably made by casting as a single integral block (as illustrated in Fig1). Iternatively, the cylinder block (10) may also be cast separately with flanges (not illustrated) and assembled together using a plurality of fasteners. The cylinder block (10) is preferably made of a high strength and high rigidity material preferably cast iron of grade C444, C4 40, C415-32, C432. Alternatively, the cylinder block (10) may also be cast from aluminum alloy of grade ACJ14 and C3-26. There may also be one or more rows of cylinders arranged in parallel and in opposing fashion. Preferably the cylinder block (10) is mounted along the vertical direction during assembling on to the automobiles. The cylinders (12) are preferably identical and are axially aligned in a mutually facing relationship with each other (as illustrated in Fig1). In the embodiment shown (see Fig1) a cylinder head (14) is mounted to each cylinder (12) through a flanged joint. A plurality of cooling fins (16) is provided on the outer surface of the cylinders (12) for dispersing combustion heat to the external. Each cylinder (12) comprises an inlet valve (18) for entry of combustion gas through a carburetor (not shown) and an exhaust port (19) for outlet of exhaust gas from the cylinder (12). The piston unit, according to the present invention comprises a pair of piston members (15) connected together by a T- link (17) having an eye end similar to a knuckle joint as shown in Fig 1. The T- link (17) preferably has a circular cross section and is preferably made by forging. Alternatively, the T-link (17) has an I - cross-section or C-cross-section. The piston member (15) is made of preferably aluminum alloy having a tensile strength of about 50-90 Mpa. For working range of piston above 6 m/sec, grey cast iron having tensile strength of about 35 to 40 MPa is preferred. Referring to Fig 1, a connecting rod (30) connects the free end of the T-Link (17) to a crankshaft (32). The connecting rod (30) comprises a small end (33) and the big end (34) and has a length which is substantially equal to twice the stroke of the piston member (15). The connecting rod (30) is fabricated using carbon and alloy steels having high resistance to fatigue. Preferably, the connecting rod (30) is made by casting from steel of grade 40,45l 2. The small end (33) is connected to the piston member (15) while the big end (34) is connected to the crankshaft (32) through independent bushes (not illustrated) which help in reducing wear and also provide bearing effect. The crankshaft is made of machined carbon . and alloy steels of grades 18XHBA, 40XHMA and heavy duty cast iron. The crankshaft, according to the present invention does not have balance weights as there is no idle stroke in the engine. A pair of eccentric cams (50) are individually axially opposite at each end of crank shaft (32). Fig 2. The engine according to the present invention comprises a valve actuation mechanism which comprises a follower rod (40) which sit one end comes into periodical contact with the eccentric cam (50). A wedge (42) is configured at other end of the follower rod (40). A roller ( 44) mounted to one end of a valve slider (46) with roller (44) at one end, engages with the wedge (42) such that rotation of cam (50) results in actuation of the inlet valve (18) thrbugh the wedge-roller engagement, thereby resulting in control of inflow of combustion gas into the cylinders accordingly. Exhaust ports (19) (see Fig 3) are provided for outlet of combustion gas from the cylinder. Referring to Fig 3, the position of piston members (15) is at Top Dead Centre (TDC) and the cylinders are represented by WS1 & WS2. In WS1, when complete compression of the combustion gas occurs, in WS2, suction of fresh charge occurs through the inlet valve (18). As the piston member (15) reaches TDC, the inlet valve in WS2 opens and fresh charge of air and fuel for combustion accumulated due to gravity, in pipe connected to inlet from the carburetor, flows in for accumulation in cylinder WS2. Alternatively, the fuel supply may also be carried out using a Multi Point Fuel Injection System (MP.FI). At this stage, in WS1, the spark plug (13) (see Fig 3) ignites and due to the resulting combustion forces, the piston member (15) moves downwards from TDC, generating power. The connecting rod (30) converts the reciprocation of the piston member (15) into rotation of the crankshaft (32). Simultaneously, combustion exhaust from WS1 is exhausted through the exhaust port (19). Thus the piston members operate in complementary relationship with each other and this cycle is repeated for generation of power for every half revolution of the crankshaft (32). The engine according to the present invention does not require a fly wheel to store the energy and deliver the same whenever required. The requirement of flywheel for starting of the engine is also eliminated as the engine may be started using an induction motor. Thus, while there have been shown and described and pointed out fundamental novel features of the present invention as applied to preferred embodiments thereof, it will be understood that the described embodiments are to be considered in all respects only as illustrative and not restrictive and various omissions, substitutions and changes in the form and details of the methods described may be made by those skilled in the art without departing from the spirit of the present invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Substitutions of elements from one described embodiment to another are also fully intended and contemplated. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope. WE CLAIM 1. A single stroke reciprocating internal combustion engine for automobiles such as racing motorbikes comprising. (i). a cylinder block (10); (ii). said cylinder block (10) comprising at least a pair of axially aligned cylinders (12) facing each other; (iii). said cylinders adapted for functioning as combustion chambers. wherein atleast a pair of piston (15) members connected by a rigid link (17), operate inside the cylinders in complementary relationship with each other. 2. A single stroke engine as claimed in claim 1, wherein the cylinder block is a single integrally cast block. 3. A single stroke engine as claimed in claim 1, wherein the cylinder block has split cast portions separably joined to form a single cylinder block. 4. A single stroke engine as claimed in any one of the claims 1, 2 or 3 wherein each cylinder has atleast one exhaust port (19) and atleast one-inlet valve (18) for combustion gas. 5. A single stroke engine as claimed in any one of the claims 1 to 4 wherein the link (17) for connecting the piston members to the connecting rod is a T-shaped link having an eye end similar to a knuckle joint. G. A single stroke engine as claimed in any one of the claims 1 to 5 wherein the link has a circular cross section. 7. A single stroke engine as claimed in any one of the claims 1 to 6 wherein the link has an l-shaped cross section. 8. A single stroke engine as claimed in any one of the claims 1 to 7 wherein the connecting rod (30) has a small end (33) and a big end (34) wherein the small end has a fork shape similar to a knuckle joint. 9. A single stroke engine as claimed in any one of the claims 1 lo 8 wherein the inlet valve (18) is actuated by a wedge mechanism (42). 10. A single stroke engine as claimed in any one of the claims 1 to 9 wherein the wedge mechanism comprises: (i) a roller member (44) coupled to-a valve follower (40); (ii) a wedge member connected to a sliding member (46) and adapted for engagement with said roller member; (iii) said sliding member adapted for periodic engagement with a cam member (50) wherein the cam member is mounted on the crankshaft (32). Dated this 9th day of September, 2003. FOR SANUP SUBHASH VAIDYA; PAWAN RAMESH RAJPUT; SACHIN SHANKAR RANE; BHAVANA PRAVIN RAJPUT and ASHA BHANUDAS SHELKE BY Their Agent (MANIS'HI^AURASTRI) KRISHNA & SAURASTRI

Documents:

939-mum-2003 - claims (granted) - (21-7-2004).doc

939-mum-2003 -form 2(granted) - (21-7-2004).doc

939-mum-2003-cancelled pages(21-07-2004).pdf

939-mum-2003-claims(granted)-(21-07-2004).pdf

939-mum-2003-correspondence(13-04-2004).pdf

939-mum-2003-correspondence(ipo)-(23-05-2007).pdf

939-mum-2003-drawing(21-07-2004).pdf

939-mum-2003-form 1(09-09-2003).pdf

939-mum-2003-form 19(09-09-2003).pdf

939-mum-2003-form 3(13-04-2004).pdf

939-mum-2003-form 5(13-04-2004).pdf

939-mum-2003-form 6(13-04-2004).pdf

939-mum-2003-form2(granted)-(21-07-2004).pdf

939-mum-2003-others(31-03-2004).pdf

939-mum-2003-power of attorney(15-09-2003).pdf

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