Module 5: Tractors and Transmission System Flashcards
mechanical device powered with an engine ranging from 3 to over 100 hp
tractor
two types of tractor
1) 2 wheel tractor
2) 4-wheel tractor
single-axle machine powered by an engine ranging from 3 hp to 15 hp
2-wheel tractor
double-axle machine powered by an engine ranging from 15 hp to over 100 hp
4-wheel tractor
also know as walking type tractors or hand tractors
2-wheel tractor
the first 2-wheel tractors were in introduced in the Philippines from America in the 1960s for wetland rice cultivation
true or false
false; they were from Japan
2-wheel tractors are used in operations such as:
- land preparation
- planting
- cultivating
- harvesting
- transport
in this type of tractor, implements are attached to this tractor and the operator walks behind to provide control
2-wheel tractor
classification of 2-wheel tractors according to function
- traction/pull type
- rotary type
- general-purpose type
classification of 2-wheel tractors according to function
provide pulling power through its drawbar
traction-pull type
in a traction/pull type 2-wheel tractor, what is fitted to tractor for dry land operation?
pneumatic tires
in a traction/pull type 2-wheel tractor, what is fitted to the tractor for wet land operation?
stage cage wheels
classification of 2-wheel tractors according to function
fitted with rotary blades to cut and pulverize the soil
rotary type
classification of 2-wheel tractors according to function
fitted with a drawbar for traction work and a power-take-off (PTO) for rotary work
general-purpose type
in a rotary type 2-wheel tractor, rotary blades may be attached to the wheel axle for wet land operation
true or false
false; for dry land operation
in a rotary type 2-wheel tractor, rotary blades are attached where? for wet land operation
they are attached to a front axle like a cage wheel
the wet land type of a rotary 2-wheel tractor comes with a floating device that is for?
deep mud conditions
general-purpose type tractors comes with a moldboard or disc plow attached to the _________; it also comes with a detachable ___________________ powered by the PTO
drawbar; rotavator assembly
this tractor is of Japanese design and comes normally with steering clutches and multiple speed transmission including reverse
general-purpose type
the first 4-wheel tractors were brought to PH during the ________ occupation for large-scale _______ production
American; sugar cane
_______ : drawbar
rotary : PTO
lifting : __________
power : drawbar
rotary : PTO
lifting : hydraulic system
in a 4-wheel tractor, implements are mounted on the tractor using the _________-________ ____-_____ hitch system
hydraulic-controlled three-point hitch system
it is a slow-moving vehicle (up to 30 kph) with high torque on the driving wheels
4-wheel tractor
a 2-wheel tractor comes with multiple speed transmission including reverse
true or false
false; that is a 4-wheel tractor
classification of 4-wheel tractors according to horsepower rating of the engine
- compact type
- standard type
classification of 4-wheel tractors according to horsepower rating of the engine
tractors with power rating below 32 hp
compact type
classification of 4-wheel tractors according to horsepower rating of the engine
power rating above 32 hp
standard type
standard tractors with rating of 32-49 hp
standard light
standard tractors with rating of 50-69 hp
standard light-medium tractors
a standard medium tractor has a power rating of 90 and above
true or false
false; it has a power rating of 70 hp to 89 hp
standard heavy tractors have a power rating of 100 and above
true or false
false; it is 90 and above
this is the second major component of the tractor
transmission system
common methods of power transmission
- direct coupling
- belts and pulleys
- chains and sprockets
- gears
common methods of power transmission
load is directly connected to the engine by some kind of flange device
direct coupling
common methods of power transmission
transmission efficiency is about 100%
direct coupling
in direct coupling, the speed of rotation of the engine is equal to the speed of rotation of load
true or false
true
common methods of power transmission
two pulleys are used and connected to each other by a belt
belts and pulleys
belt and pulleys transmission efficiency is same with direct coupling, is it also 100%
true or false
false; it is <100%
in belt and pulleys, clutch action may be obtained by a ______ ________
third pulley
speed ratio between engine and load depends on diameter ratio of the two pulleys
true or false
true
common methods of power transmission
two sprockets are used and connected by a roller chain
chain and sprockets
in chain and sprockets, the transmission efficiency is less than or equal to 100% because of?
chain slack
in chain and sprockets, the direction of rotation of the two sprockets are different
true or false
false; the direction is the same
in chain and sprockets, the speed ratio between engine and load depends on the number of teeth ratio of the 2 sprockets
true or false
true
common methods of power transmission
two meshed gears are used
gears
transmission efficiency of gears is __________ because of gear slack
less than or equal to 100%
in gears, the direction of rotation of the two gears are ________
opposite each other
center-to-center distance between the shafts of the gears is dictated by the _______ of the gears
size
couplings which permit the disengagement of the coupled shafts during rotation
clutch
it is a special arrangement of gears so constructed and located in the transmis system that permits one driving wheel to rotate slower or faster than the other and at the same time propel its share of the load
differential
it is an enclosed system of assembled gears that transmits and distributes power from the engine to the different parts of the transmission system
transmission box
how is the power from the engine modified?
by changing the speed and direction of rotation of the output shaft through the use of gears
through the introduction of ______ in PH agri, most farm operations are being handled with ease and high efficiency
2-wheel tractors
these are also called as walk-behind tractors which are used worldwide for small-scale farm, horticultural, industrial, landscaping and home use
2-wheel tractors
normally powered by gasoline or diesel engines and are fitted with either rubber tires or steel cage wheels
2-wheel tractor
in a 2-wheel tractor, these are used for dry land plowing and transportation
rubber tires
in a 2-wheel tractor, these are used for all wet workings
cages wheels
it is necessary that a tractor be operated within a narrow range of its speed to develop its rated power and to obtain best fuel economy
true or false
true
is it necessary that the high speed of the engine be reduced at the final drive to obtain a ____________
practical vehicle speed