Tutorial: Engineering technology Topic: Pin connections 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.

PIN CONNECTIONS  Pin connections are connections with shaped contact and they belong to demountable contacts.  They are common structural component of machine nodes, their usage is extensive, they are standardized and that is why they can be changed.  They are used to transmission of low powers and to fixing and securing mutual position of 2 components.  Further usage is e.g. as security against overloading of components in operation.  Pin is fixed in one or more components with preload caused by dimensional allowance of pushed pin towards hole.  Pins are strained by different powers as cutting pressure and bending.

PINS CLASSIFICATION CYLINDRICAL  Suitable for fixing the position of 2 fitting parts  Produced with standardized diameters from Ø 0,6 – 50 mm  Cylindrical pins are made with ground or bright drawn surface in tolerance h8, h11, m6  Hole adapts pin diameter, hole can be nor free nor too tight a)Smooth b) With taper end c) With ends determined to riveting d) Flexible

PINS CLASSIFICATION TAPER PINS  Used to fixed connections  Their degree of taper is 1:50, they are normalized  Taper hole must be machined in both parts at the same time – drilling and reaming too  Taper pin is kept in a hole by friction, they are self-locking  It is difficult to force them out or pulled them out, that is why there are used pins with outside and inside thread a)Smooth b) With outside thread c) With inside thread d) With head

PINS CLASSIFICATION GROOVED  Grooved pins are used for connections  Hole doesn’t need to be reamed  They have 3 longitudinal grooves on the circuit  Pressuring out of grooves initiates overhangs on pin preventing loose of connection a)Grooved pins b) Grooved pins c) Grooved pins

PINS USAGE CONNECTING AND FIXING CONNECTION OR FIXING OF 2 COMPONENTS E.G. CRANKSHAFT GEARS, BARS ON SLEEVE ETC.

PINS USAGE CARRYING CARRY ALONG ONE MACHINE COMPONENT BY THE SECOND ONE.

PINS USAGE RETAINING RETAINING OF COMPONENT E.G. SPRING

PINS USAGE SECURING EXACT RELATIVE SETTING OF 2 COMPONENTS´ POSITION.

PINS USAGE INSURANCE MACHINE COMPONENTS INSURANCE AGAINST LOOSENING OR MOVING ROUND A SLIGHT AMOUNT.

 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 Translation:    JANATA, Petr. Handy slovník technický anglicko-český a česko-anglický. Plzeň: Nakladatelství Fraus, ISBN  Lingea LEXIKON 5, Technický slovník anglicko-český a česko-anglický

 Write down pins´classification.  Name at least 3 ways of pins´ usage.  Write down about degree of taper of taper pins.