Methods of exerting forces and displacements introduction to the design of basic machine - PowerPoint PPT Presentation

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Methods of exerting forces and displacements introduction to the design of basic machine

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Rack and pinion mechanism. Transformation of. rotational motion into linear motion. Cam mechanisms ... Rack and pinion mechanism. Push rod. Cam follower ... – PowerPoint PPT presentation

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Title: Methods of exerting forces and displacements introduction to the design of basic machine


1
Methods of exerting forces and displacementsintro
duction to the design of basic machine
2
Levers
Give me point of support and I will lift the
EarthGalileo Is this true?
3
Power screws (screw gears)
Screw with a nut is a basic machine able to
achieve a large force in the screw by multiplying
the force applied to the nut
Torque that has to be applied to the nut (or
screw head) in order to obtain force P
On the other side Mn Fhand x Lwrench
4
Power screws
Various configuration of mechanisms
Compound and differential screws (Hunters)
5
Mechanizmy srubowe
Evaluating torque and force
6
Design of a power screw
Selection of thread 1. Thread type trapezoidal
thread (Acme) or butress threadlub niesymetr. 2.
Minor diameter
- destruction of the bolt shank
Screw under tension - break Screw under
compression - exceeding allowable stress -
flexural buckling (wyboczenie)
Material selection limited specific load Cast
iron 8-30 MPa brass 8-15 MPa bronze 10-30
MPa Aluminium bronze 10-40 MPa
- Destruction of the thread
seizure of the surfaces excessive wear
3. Thread pitch standard values selected to
obtain required mechanical advantage and
self-locking properties. A possibility to use
differential and summing mech.
7
Rope mechanisms
Pulley block (compound pulleys)
8
Hydraulic devices
9
Rack and pinion mechanism
10
Transformation of rotational motion into linear
motion
crankshaft
Push rodCam follower
11
Transmissions
Gear transmision
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