Machine Elements Flashcards
connecting machine element which permits the connected members to rotate or to move in a straight line relative to one another. They are removable elements, which suppport other elements and shore up.
axle
a machine element mounted between moving and non moving parts.
Purpose: It supports, guides, and reduces the friction of motion between fixed and moving machine parts and thus decreases wear
Examples: Plain bearings, Rolling bearing, sliding bearing, bevel bearing
bearing
transmission element between two elements like shafts, and looks like a long band made of rubber or lea- ther for example.
A belt can be defined as well as a continuous band of tough flexible material for transmitting motion and power or conveying materials
belt
Fastener with a threaded shaft and a hexagonal male head
N.B.: According to the Machinery’s Handbook, the difference between a screw and a bolt is their intended design: bolts are designed to pass through an unthreaded hole in a component and be fastened with a nut although such a fastener can be used without a nut to tighten into a threaded component such as a nut- plate or tapped housing.
Screws in contrast are used in components which contain their own thread, or to cut its own internal thread into them. This definition allows ambiguity in the description of a fastener depending on the application it is actually used for, and the terms screw and bolt are widely used by different people or in different coun- tries to apply to the same or varying fastener.
bolt
An engine shaft fitted with a cam or cams.
camshaft
a connected, flexible series of links, typically of metal, used especially for holding objects together, for restraining, or for transmitting mechanical power for example between sprockets (as transmission element)
chain
mechanical device that engages and disengages the power transmission, especially from driving shaft to driven shaft.
Clutches are used whenever the transmission of power or motion must be controlled either in amount or over time (e.g., electric screwdrivers limit how much torque is transmitted through use of a clutch; clutches control whether automobiles transmit engine power to the wheels).
Source: Wikipedia, 2016
clutch
Definition 1
machine element which is used to connect two shafts. Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slip or disconnect when some torque limit is exceeded.
primary purpose of couplings: is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both.
examples: jaw couplings, oldham couplings Source: Wikipedia, 2016
Definition 2
a device that connects two parts or thing
coupling
shaft which translates reciprocating linear piston motion into rotation
crankshaft
A rotating mechanical device that is typically made of steel and rotates on conventional bearing. It is used to store energy or compensate irregular energy for other machine elements to perform.
flywheel
gear train (train of gears)
assembly of gear wheels that mesh into each other
A usually round machine element with teeth around its circumference, the purpose of the teeth being to mesh with similar toothed element
gear wheel
a system of gears and associated elements by which motion is transferred within a machine.
gearing
Definition 1
bonding substance, adhesive often based on organic substance (e.g. resin)
Definition 2
a substance used to stick things tightly together
glue
a long, usually flexible rubber tube that liquids or gases can flow through
hose
the central portion of a wheel
hub
a long, thin piece of metal that is sharp at one end and flat at the other end and that is used chiefly to at- tach things to wood
nail
a perforated block usually of metal that has an internal screw thread and is used on a bolt or screw for tigh- tening or holding something
nut
a long, hollow tube for carrying water, steam, gas, etc
pipe
the shaft that transmits power from the gearbox to the differential gear in a motor vehicle or from the en- gine to the propeller in a ship or aircraft
prop shaft
a simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load.
pulley
a headed pin or bolt of metal used for uniting two or more pieces by passing the shank through a hole in each piece and then beating or pressing down the plain end so as to make a second head
rivet
fastener that looks like a tapered rod or shaft with a helical groove (called ’thread’) formed on its surface, whose main uses are to hold objects together.
Screws can be made of different metals (brass, steel, steel alloys etc…) and it used for fastening pieces of solid material together
N.B.: According to the Machinery’s Handbook, the difference between a screw and a bolt is their intended design:
Screws are used in components, which contain their own thread, or to cut its own internal thread into them. This definition allows ambiguity in the description of a fastener depending on the application it is ac- tually used for, and the terms screw and bolt are widely used by different people or in different countries to apply to the same or varying fastener.
Bolts in contrast are designed to pass through an unthreaded hole in a component and be fastened with a nut although such a fastener can be used without a nut to tighten into a threaded component such as a nut-plate or tapped housing.
screw
resistance welding in which the weld is made linearly (as between two rollers, a roller and a bar)
seam welding
Machine element which looks like a long cylindrical bar, used to transmit to elements not only torque but also torsion forces- bending moment.
shaft
magnetically-controlled valve
solenoid valve
a spring is a machine element which contracts under compressive load and recovers its original shape when this load is released
Purpose: the spring is used to dampen vibration, to store energy or to absorb a shock for example Example of usage: Shock absorbers of cars consist of a spring and other machine elements
spring
round machine element with teeth around its circumference, the purpose of the teeth being to mesh with a chain
sprocket
a long, hollow object that is used especially to control the flow of a liquid or gas
tube
Element which closes, opens or regulates a fluid (a liquid or a gas, a fluidized slurry etc…)
valve
