Direct Drive Flashcards
In direct drive, there is _______ in the speed of the driver
and driven parts of the machine.
no change
Transmission of power (torque and speed) from the driver
to the driven part of the machine is done without any
driven wheel such as pulley, sprocket, or gear.
Direct drive
Can be considered as more efficient
as compared with the other transmission systems.
Power Transmission systems
Characteristics of Direct Drive
• It is an efficient method of transmitting power for the reason
that there is minimal losses in the drive train as compared
with the other methods.
• Design is simple with very few moving parts.
• There is a need for a special type of driver machine in order
to provide high-torque output when using low rpm driven
machine.
• It needs a more precise control mechanism.
Applications of Direct Drive
• Transmitting power from tractor PTO drive to rotavator,
post-hole digger, power harrows, etc.
• Transmitting power from the engine to the rear wheel
axle of self-propelled farm machines.
• Driving stand-by generator when using internal
combustion engine.
• Driving fans, blowers, and pumps.
• Others
Coupling connecting rigid rods with axes inclined to each other and
is the commonly used shaft that transmits rotary motion.
Universal joint or Cross joint
It allows one or more rotating shaft to be linked together
allowing the transmission of torque and/or rotary motion.
Universal joints or Cross joint
It is commonly used for misaligned shaft which can be
amplified by the use of multiple universal joints.
Universal Joints or Cross joint
Used to reduce transmission of shock
loads from one shaft to another. It also allows to slip when
overloaded
Coupling Transmission
Power transmission components used to couple shafts of various mechanical devices, and to compensate for shaft misalignment, reducing stress to shafts and bearings
Drive Coupling
Types of Drive Coupling
a. Jaw coupling
b. Sleeve coupling
c. Tire coupling
d. Disc coupling
e. Diaphragm coupling
f. Gear Coupling
g. Grid coupling
h. Roller-chain coupling
It is usually used to transmit torque from one
shaft to another when the two shafts are slightly misaligned.
Flexible Coupling
a device for transmitting rotary motion between
two objects which are not fixed relative to one another. It
consists of a rotating wire rope or coil which is flexible but has
some torsional stiffness.
Flexible Shaft
1. Device used to transmit power by connecting shafts together. a. Flexible coupling b. Rigid coupling c. All of the above d. None of the above.
C. All of the above
- What transmission drive would you
recommend for the design of a
manually-operated back-pack power
harvester?
C. Flexible Shafting
- If a drive shaft of the machine is in
line with the drive shaft of the engine,
what transmission drive would you
recommend?
a. coupler
4. Device used to connect two shafts together for the purpose of transmitting power permitting some degree of misalignment, end movement, or both.
coupler
5. Hydrodynamic device used to transmit rotating mechanical power of a tractor with the use of a fluid with pump that is connected to the flywheel of the engine and a turbine to the input shaft of the transmission gear.
C. fluid coupling
- Gripping device placed between
the power source and the machine
to be driven.
Clutch
- Type of clutch used to drive a
machine element in only one
direction.
Overrunning Clutch
- Type of clutch that limits the
amount of torque or power
transmitted to the driven member
through the shaft.
Slip clutch
Mechanism of a tractor which enables the rotary motion of one shaft is transmitted to the second shaft whose axis is coincident with that of the first.
clutch
Clutch of the tractor is located
____ the engine and the gear box.
between
Clutch is disengaged when
____ .
a. starting the engine
b. shifting the gears
c. idling the engine
