Machinery Flashcards
Stage one of 2stroke engine
With the piston rising, the suction created behind it causes air/fuel to be drawn into the crankcase through a port.
Stage2 of 2stroke engine
With the piston at the top of its stroke the spark plug will ignite or the diesel fuel will be injected, combustion will then take place.
Stage 3 of 2stroke engine
As the piston is forced down by combustion the pressure beneath the piston builds within the crankcase and the fuel mix is sent up through the transfer port in the cylinder just above the piston. At the same time, the action of the fuel mix going into the combustion chamber forces the spent exhaust gases out of the cylinder through the exhaust port.
Stage 4 of the 2stroke engine
The piston has got to the bottom of its stroke; the inducted fuel mix from the crankcase has been forced up the transfer port to the combustion chamber where it has forced out the exhaust gasses from the previous firing stroke of the engine.
Gear drives
Power transmitted through direct contact between interlocking teeth- positive engagement.
Belt drives
Power transmitted through friction between a belt and pulleys.
Contact and slip in Gear drives
No slip due to meshing teeth, ensures precise transmission.
Contact and slip in belt drives
Some slip may occur, especially underload, leading to less precision.
Noise and vibration gear drives
Noisier due to metal-on-metal contact and higher vibration
Noise and vibration belt drives
Quieter and smoother, absorbs vibration.
Speed and load capacity gear drives
Suitable for high-load and high-torque applications
Speed and load capacity belt drives
More suited for lighter loads and moderate speeds
Durability and maintenance gear drives
Long-lasting but require regular lubrication and maintenance
Durability and maintenance belt drives
Shorter lifespan, belts need periodic replacement but require less maintenance
Alignment and space gear drives
Precise alignment required, less flexible in shaft distance
Alignment and space belt drives
Tolerates slight misalignment, can work over longer distances
Cost gear drives
More expensive
Cost belt drives
Cheaper
Efficiency gear drives
High efficiency 95-98%
Efficiency belt drives
Slightly less efficient 90-95% due friction and slip
Manual transmission
The driver manually shifts gears using a clutch and gear stick, offering more control and often higher fuel efficiency.
Automatic transmission
Gears shift automatically based on speed and load, providing ease of use and less driver effort but typically with lower fuel efficiency.
Semi-automatic transmission
A hybrid of manual and automatic, this system allows for gear selection without a clutch pedal, offering more control than an automatic but less complexity than manual.
Types of power
Electric, battery, spark ignition, compression ignition, PTO, hydraulic