Group 25 - Snow Blower (Gasoline Powered)/Gate3
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===Product Analysis=== | ===Product Analysis=== | ||
Revision as of 18:39, 28 October 2012
Contents |
purpose
Project Management: coordination review
cause for corrective action
Product Archaeology:Product evaluation
component summary
engine
| # | Component/subsystem | Image | Description | Material | Component connected |
|---|---|---|---|---|---|
| 1 | Gas Tank |  |
The gas tank stores the gasoline that powers the engine of the snow blower. The fuel line is connected to the bottom of the tank and leads to the carburetor. |
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| 2 | Carburetor |   |
The carburetor is bolted onto the intake manifold of the engine body and it imports fuel through the fuel lines from the gas tank and mixes it with air it imports from the atmosphere. Once the intake valve is actuated by the cam shaft, the fuel mixture gets sucked into the cylinder. |
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| 3 | Valves |  |
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| 4 | Camshaft |  |
Rotated by the crankshaft to actuate the intake and exhaust valves using two cams that are set on the shaft. The camshaft rotates and periodically opens the intake and exhaust valves in extremely synchronous timing with the crankshaft. |
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| 5 | Piston |   |
The piston subsystem consists of the piston head, connecting rod and piston rings. The piston head has three grooves in it where the piston rings sit. These rings seal off the bottom of the piston from the top. The piston head and rings are situated inside of the cylinder of the engine body. The connecting rod is attached to a pin on the bottom of the piston head so that it is free to rotate on one axis. Below the cylinder, the other end of the connecting rod is bolted to the crankshaft. When the piston moves vertically in the cylinder this linear motion is converted to rotational motion through the connecting rod. |
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| 6 | Crankshaft |  |
The crankshaft sits horizontally in the engine body. The eccentric vertical force from the connecting rod creates a moment which rotates the shaft. The teeth of the gear on the crankshaft mesh with the gear in the camshaft. The gear on the governor is also meshed with the gear on the crankshaft. |
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| 7 | Governor |  |
The governor provides a negative feedback system between the crankshaft and the carburetor. It sits on the engine body cover and when in place, the gear on the governor meshes with the gear on the crankshaft. When the crankshaft rotates too quickly, two small spring loaded weights on the governor move outward due to centrifugal force. This causes the governor to move a pin on the outside of the engine body cover which is connected to the carburetor. Once the pin moves, the carburetor reduces the amount of fuel it is dispensing into the cylinder until the crankshaft slows down enough for the spring loaded weights to move back into place. This process is constantly happening in the motor to regulate the flow of fuel into the cylinder. |
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| 8 | Flywheel |   |
The purpose of the flywheel is to store the rotational energy coming from the crankshaft. It is mounted to one end of the crankshaft that is tapered using a keyway. The flywheel also houses two magnets that pass very close to the spark distributor when the crankshaft rotates. |
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| 9 | Spark Distributor |  |
The spark distributor slides onto the crankshaft (underneath the flywheel) and is bolted to the engine body. When the flywheel rotates, two magnets pass very close to a portion of the distributor and cause an electric current to flow. The electric current runs out of the distributor though a wire to the spark plug. |
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| 10 | Spark Plug |  |
The spark plug is what creates the spark in the combustion chamber to ignite the fuel. The top of the spark plug is connected to the wire running from the spark distributor. The wire feeds electric current into the spark plug which creates a spark at the bottom of the plug. The spark plug is bolted into the cylinder head and the sparking section if it sits right above the piston. |
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| 11 | Cylinder Head |  |
The cylinder head is bolted to the top of the cylinder portion of the engine body. The cylinder head houses the spark plug and the underside of the head is where the combustion of fuel takes place. |
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| 12 | Muffler |  |
The muffler is attached to the exhaust port on the engine body. It directs the exhaust out and away from the engine as well as muffling some of the noise coming from the engine. |
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| 13 | Engine Body(crankshaft and connecting rod visible in picture) |  |
The engine body provides a base for all of the engine subsystems and components to be supported and fastened to. The top portion of the engine body is the cylinder while the bottom of the engine body is the crank-case. |
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| 14 | Pull start |  |
The pull start is bolted onto one of the body panels. When someone pulls the cord on the pull start, a tooth on the pull start grabs onto a receiving cup that is bolted directly to the flywheel and spins the flywheel. This is one way to start the engine if electricity is unavailable. |
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| 15 | Electric Starter |  |
The motor of electric start is screwed onto the engine body while the plug receiving end is screwed to the cylinder head. When plugged into an electrical source the electric starter can be activated using a button on the plug receiving end. When the button is pushed, the electrical motor spins causing the gear on the tip of it to engage with the teeth on the flywheel. Once you stop pressing the button the electric motor stops spinning and the tip of it retracts to its original position. |
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| 16 | Pulley |  |
The pulley is what transfers the power from the engine to the belts that drive the auger and drivetrain. It is fastened onto the crankshaft using a keyway and two set screws. |
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