Slide 2 Tutorial: Engineering technology Topic: Friction
transmission Prepared by: Ing. Jaroslav Hbl Projekt Anglicky v
odbornch pedmtech, CZ.1.07/1.3.09/04.0002 je spolufinancovn
Evropskm socilnm fondem a sttnm rozpotem esk republiky. Slide 3
FRICTION TRANSMISSIONS Slide 4 ADVANTAGES OF FRICTION TRANSMISSION
Quiet operation It can have the function of coupling Impacts are
absorbed by slippage Little distance of axis at contact gears Slide
5 FRICTION TRANSMISSION DISADVANTAGES OF FRICTION GEARS High
pressure on shafts and bearings Unevenness of transmission rate
Even roll wearing circularity disturbance Slide 6 FRICTION
TRANSMISSION DISADVANTAGES OF FRICTION GEARS High pressure to
shafts and bearings Volatility of gear ratio Even roll wearing
circularity disturbance Slide 7 FRICTION TRANSMISSION Gear ratio
The rule for friction gears by slip effect is: = slip coeficient
Slide 8 FRICTION TRANSMISSION Basic types of friction contact gears
a b c d e f a) Outside gearing, b) inside gearing, c) outside gear
with keyway, d) inside gear with keyway, e) conical bearing, f)
gear with face wheels Slide 9 FRICTION TRANSMISSION MATERIALS OF
FRICTION WHEELS Quenched steel x quenched steel higher pressure
force enables higher load transmission, Longer durability. Rubber x
steel or cast iron gearing has quiet operation, it transmits cca
10x smaller loading. Other materials x steel or cast iron e.g.
Fibre, plastics etc. Non-metallic materials are mostly used as
metallic wheels lining. Slide 10 FRICTION TRANSMISSION
CONSTRUCTIONAL VERSION OF FRICTION WHEELS a) Frontal with lining,
b) frontal with layered leather, c) face cast iron wheels, d) face
wheels with lining Slide 11 FRICTION TRANSMISSION CONSTRUCTIONAL
VERSION OF FRICTION WHEELS a) WHEEL WITH LINER, b) WHEEL WITH
LEATHER LINING, c) IRON CONICAL WHEEL, d) FRICTION FACE WHEEL WITH
DIVIDED THREAD Slide 12 FRICTION TRANSMISSION Constructional
version of friction wheels a) Frontal with lining, b) frontal with
layered leather, c) face cast iron wheel, d) face wheel with lining
Slide 13 Stroje a zazen I, J. Doleek, P. Gajdo, V. Novk Strojnictv
I, J. Doleek, Z. Holoubek Strojnictv II, J. Doleek, Z. Holoubek
Modern strojrenstv, Josef Dilinger a kolektiv Slide 14 What are the
advantages of friction wheels? What materials are used for friction
wheel construction? Name at least 3 types of transmission by
contact wheels.
