THEORY OF MACHINES

Frnds now i'm providing information about Theory Of Machines ,it expalins what is Kinematics , Mechanism , kinematic pairs,joints,it also explains about different types of Kinematic chains like Single slider ,Double slider crank chains & their invenstions like . Elliptical trammers , Scotch yoke mechanism ,Oldham’s coupling..etc.

                    

                     it also gives information about DEGREE OF FREEDOM ,

  Kutzbach criterion for determining  Degree of Freedom for plane mechanisms  .etc. I think this one useful to you to know the information about Theory of Machines .

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DIRECT INJECTION OF GASOLINE

DIRECT INJECTION OF GASOLINE

Gasoline direct-injection engines generate the air/fuel mixture in the combustion chamber. During the induction stroke, only the combustion air flows through the open intake valve. The fuel is injected directly into the combustion chamber by special fuel injectors.

Method of operation Gasoline direct-injection systems are characterized by injecting the fuel directly into the combustion chamber at high pressure (Fig. 1). As in a diesel engine, air/fuel-mixture formation takes place inside the combustion chamber (internal mixture formation).

High-pressure generation The electric fuel pump (Fig. 2, Pos. 19) delivers fuel to the high-pressure pump (4) at a presupply pressure of 3...5 bar. The latter pump generates the system pressure depending on the engine operating point (requested torque and engine speed). The highly pressurized fuel flows into and is stored in the fuel rail. As like , Gasoline injected into cylider as shown in below figure.

WORKING PRINCIPLE OF WANKEL ENGINE

WORKING  PRINCIPLE OF WANKEL ENGINE

The Wankel engine is a type of internal combustion engine. It uses rotors instead of pistons inside its combustion chamber. eccentric rotary design to convert pressure into rotating motion. Over the commonly used reciprocating piston designs, the Wankel engine delivers advantages of: simplicity, smoothness, compactness, high revolutions per minute, and a high power-to-weight ratio. The engine is commonly referred to as a rotary engine

Wankel developed the Wankel-type rotary engine in 1957

The rotary engine is composed of a cocoon-shaped housing and a triangular-shaped rotor inside of it. The space between the rotor and the housing wall provides the chamber for internal combustion and the pressure of expanding gases serves to turn the rotor. In order to make the rotary engine work as an internal combustion engine, the four processes of intake, compression, combustion and exhaust had to be performed in succession in the working chamber. Suppose that the triangularshaped rotor were concentrically placed inside a true circular housing. In this case, the working chamber would not vary in volume as the rotor turned inside the housing. Even if the fuel-air mixture were ignited there, the expansion pressure of combustion gas would merely work toward the center of the rotor and would not result in rotation. That was why the inner periphery of the housing was contoured as a trochoid-shape and assembled with the rotor installed on an eccentric shaft. The working chamber changes in volume twice per revolution, thus the four processes of the internal combustion engine could be achieved. With the Wankel-type rotary engine, the rotor’s apices follow the oval contour of the inner periphery of the engine casing while remaining in contact with the gear on the output shaft which is also in eccentric orbit around the center point of the engine casing. A phase gear mechanism dictates the orbit of the triangular rotor. The phase gear consists of an inner-toothed gear ring fixed on the inside of the rotor and an outer-toothed gear fixed on an eccentric shaft. If the rotor gear were to have 30 teeth inside it, the shaft gear would have 20 teeth on its perimeter so the gear ratio is 3:2. Due to this gear ratio, the rate of turning speed between the rotor and the shaft is defined as 1:3. The rotor has a longer rotation period than the eccentric shaft. The rotor rotates one turn while the eccentric shaft rotates three turns. With the engine running at 3000rpm, the rotor will run at a mere 1000rpm.

Advantages

·         A far higher power to weight ratio than a piston engine

·         It is approximately one third of the weight of a piston engine of equivalent power output

·         It is approximately one third of the size of a piston engine of equivalent power output.

M&MS

Frnds this is about material science & metallurgy related to Mechanical department,it is very intresting one.It is we are applying in our real life situations.I think it is useful to all.

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About Mechanical Department

Frnds i'm created a small vedio about Mechanical Engineering for our juniors to understand about course for presenting in our college QISCET,Ongole.

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Quotes on Frendship

1. Friendship is always a sweet responsibility,        never an opportunity
2. True friendship multiplies the good in life and divides its evils. Strive to have friends, for life without friends is like life on a desert island… to find one real friend in a lifetime is good fortune; to keep him is a blessing.

Kinematice Of Machines

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Cylinder Formulas

Surface Area = (2 • π • r²) + (2 • π •r • height)

here (2 • π • r²) is the surface area of the "ends" and (2 • π • r • height) is the lateral area (the area of the "side").

Volume   =   π • r² • height  = ¼ • π • d² height

Sphere Formulas

Sphere Surface Area     =   4 • π • r²  =     π • d²

  Sphere Volume   =   4/3 • π • r³    =    ( π •d³)/6

Circle Formulas

Circumference   =  2 • π • radius   =   π.diameter

Circle Area   =       π • r²     =     ¼ • π • d²