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Tutorial: Engineering technology Topic: Friction transmission Prepared by: Ing. Jaroslav Hábl Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002.

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Presentation on theme: "Tutorial: Engineering technology Topic: Friction transmission Prepared by: Ing. Jaroslav Hábl Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002."— Presentation transcript:

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2 Tutorial: Engineering technology Topic: Friction transmission Prepared by: Ing. Jaroslav Hábl Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

3 FRICTION TRANSMISSIONS

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

5 FRICTION TRANSMISSION DISADVANTAGES OF FRICTION GEARS  High pressure on shafts and bearings  Unevenness of transmission rate  Even roll wearing – circularity disturbance

6 FRICTION TRANSMISSION DISADVANTAGES OF FRICTION GEARS  High pressure to shafts and bearings  Volatility of gear ratio  Even roll wearing – circularity disturbance

7 FRICTION TRANSMISSION Gear ratio The rule for friction gears by slip effect is: ψ = slip coeficient

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

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.

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

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

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

13  Stroje a zařízení I, J. Doleček, P. Gajdoš, V. Novák  Strojnictví I, J. Doleček, Z. Holoubek  Strojnictví II, J. Doleček, Z. Holoubek  Moderní strojírenství, Josef Dilinger a kolektiv

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.


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