The document discusses the transmission of engine power. It states that torque and speed relate to power transmission from engines. Power can be transmitted directly from engines to driven units using couplings and gear trains. Couplings connect two shafts to transmit power, while clutches engage and disengage power transmission between engines and drive wheels. Reduction gears reduce speed while maintaining torque output. Reverse gears allow backward rotation using a three-gear arrangement.

1. TRANSMISSION OF ENGINE POWER
Dane Johnson
George Pecco
Dalene Coore
Romarne J. Buddington

2. Objectives
State that the factors related to the transmission
of engine power are torque and speed.
Show that power from the engine can be
transmitted to the driven unit directly.
Use sketches to demonstrate the working
principles of:
- Solid couplings
- Flexible couplings
Explain the uses of clutches, reverse gears and
reduction gears in the transmission of engine
power.

3. WHAT IS TRANSMISSION ?
The transmission is a device that is connected
to the back of the engine and sends the power
from the engine to the drive wheels
Purpose of the transmission is to provide high
torque at the time of starting the engine.

4. Torque
Torque is a force that causes rotation of an
object.
In and internal combustion (IC) engine the
crankshaft supplies this rotational force to various
parts, such as gears and shafts which in turn
transmits this power to the driven unit (blower,
camshaft , governor etc.)
Gears increase and decrease torque

5. Speed
Speed is related to torque and as a result the
speed is determined by how much revolution
of turning force (torque) within a given time
usually seconds or minutes (rev/s or rev/min).
 If maximum efficiency is to be obtained, an
engine must operate at a certain speed
therefore more rotational force (torque)
supplied results in more speed.

6. Gear train
 It is defined as two or more gears are made to mesh
with each other then power is transmitted from one
shaft to another.
The nature of the train used depends upon the velocity
ratio and the relative position of the axes of shafts.

9. Types of gear trains
Simple gear train
Compound gear train
Reverted gear train
Epicyclic gear train

10. when there is only one gear on each shaft is called simple
gear train
Simple Gear Train

11. Compound Gear Train
when there are more than one gear on a shaft is called
compound gear train

12. Reverted Gear Train
When the axes of the first gear and the last gear are co-
axial then the gear train is known as reverted gear train.

13. Epicyclic Gear Train
The axes of the shafts over which the gears are
mounted, may move relative to a fixed axis.

14. Coupling
A coupling is a device used to connect two shafts
together at their ends for the purpose of
transmitting power directly from one staff to the
next.
Allow two pieces of rotating equipment some
degree of misalignment or end movement or both.

16. Solid Coupling
A flanged-face or a compression-
type coupling used to connect two shafts to
make a permanent joint.
Usually
designed to be capable of transmitting the full load cap
acity of the shaft;
A solid coupling has no flexibility.

20. Flexible Coupling
 Used in areas where the coaxiallity
between the connecting shafts is not
always assured.
 Used in areas where shocks in the
transmission is applicable.
 Elastic member in between the two
connecting entities.

22. Spring

24. What is clutch
It is a device which carries a power form engine to
drive wheel through shafts.
It is located between flywheel and gearbox

25. How it Works

27.  A reduction gear is an arrangement by which an
input speed can be lowered for a requirement of
slower output speed with same or more output
torque.
Reduction gear assembly consists of a set of
rotating gears connected to a wheel work.
The reduction gear assembly is usually known as
reduction gear box
Reduction Gear

29. • Single reduction gear
• Double reduction gear
Types of Reduction Gears

30. Reverse Gear
The reverse gear uses a three-gear arrangement.
Out of these, one is the idle gear, and the other two
are input and output gears.
When the idle gear is pushed, and connected to the
other gears, the output shaft will turn in the reverse
direction

31. Reverse Gear

32. Transmission of Engine Power

33. Differential
Act as the final gear reduction in the vehicle, slowing
the rotational speed of the transmission one final
time.

34. To the Wheels

35. Summary
Two factors that relates to the transmission of power are Torque
and speed.
Power, speed and torque from engines are transfer by gears and
gear train directly to the driven unit.
A coupling joins two shafts together at their ends for the
purpose of transmitting power directly from one staff to the
next.
The clutch is a device which carries a power form engine to drive
wheel through shafts by engaging and disengaging.
Reduction gear reduces speed without reduction of the torque
Reverse gear allow rotation in a backward direction allow drive unit
to move backward (reverse)

36. References
 Integrated Publishing, Inc. (n.d.). Retrieved April 08, 2017, from
http://www.tpub.com/engine3/en33.htm
 Karim Nice, C. W. (n.d.). How Clutches Work . Retrieved from How Stuff
Works Auto: http://auto.howstuffworks.com/clutch.htm
 Raunekk. (2009, 8 28). What is a Reduction Gear? Retrieved from Bright Hub
Engineering: http://www.brighthubengineering.com/machine-design/47267-
what-is-a-reduction-gear/
 Understanding Clutches . (n.d.). Retrieved from Roadkill Customs :
http://www.roadkillcustoms.com/hot-rods-rat-rods/Understanding-
Clutches.asp#axzz4dqeVaGld
http://m.machinedesign.com/mechanical-drives/flexible-
couplings
www.sdp-si.com/catalogs/D757-Couplings-Universal-
Joints.php#considerations