Belt serves to connect the two shafts are far apart, when it is not possible to use gears, makadapat used flexible belt or chain wrapped around a pulley or sprocket on its axis each. This method is also known as the indirect power transmission, which can digolongkanmenjadi:
1. Transmission belt;
2. Trnasmisi chain;
3. Transmisis cord or rope.
The use of transmission belts, can be divided into three groups, namely:
- For two shafts within up to 10 m, with a ratio of 1/1 Puteran until 6/1, used for flat belts;
- For two shafts within up to 5m, with a ratio of 1/1 Puteran until 7/1, dikapai trapezium belt;
- For two shafts within up to 2m, with a ratio of 1/1 to 7/1 secaratepat round, worn with a belt-driven gear has a flat sprocket.Sabuk slip greater than V belt, so the strain used labih V.Sabuk V belt mamiliki ability kecaepatan up to 25 m / s, with a capacity of up to 500 kW.Jika used belt length, or the ratio of the diameter of pulleys connected kadua cukupbesar usually mounted belt fasteners.
Transmission belts discussed are the flat belt and seat belt V.Salah the main requirements are a high coefficient of friction, the friction coefficient sabukditentukan by the belt material and material puli.Puli usually made of cast iron, cast steel, aluminum, wood (rarely used ), or paper fiber (yangdipres with a metal core, for electric motors). Iron or cast steel has ketahananterhadap friction and wear well.
Belt is also called machine tire (belt), divided into three types, namely flat belts, V belts, round belts (straps). Belt is made of a material that is strong, flexible, and durable (durable). Sabukmenurut classification of the material is leather belt, cotton belt, rubber belt, and the belt balata. Coefficient of friction belt depends on the belt material, the surface areas of pulleys, belt slippage and belt speed. The speed of the belt should be taken into account, because the greater the speed of the belt, the greater the gayasentrifugal belt, resulting in the greater belt tension.
The amount of centrifugal force is influenced by the mass density (density) of the belt. If the canal belt (endless) is not available, then cut the belt to be connected at both ends with binder.
Various belt connection, consisting of:
1. Cement (cemented joint)
2. Laced joint,
3. Hooks (hinged joint).
The connection is a connection to the cement manufacturer’s canal belt stronger and thus more desirable.
Figure 3.24 Connection belt Cement (cemented joint)
Connection is made with a joint laced melubagi such sahingga belt can be tied to the fastener plate (raw hide strip)
Figure 3.25 Connection raw hide belt strip