2013 MOTORCYCLE CRANKSHAFT

THE MOTORCYCLE CRANKSHAFT

in this post I was discussing about the shaft drive motorcycle pistons / crankshaft..apa function? how does it work .. lets see
Function is changing the crank shaft piston movement into rotary movement (the engine) and forward coupling force (moment of force) that generated a transporter to the motor power up to the wheels.
Load acting to the crank shaft is:
- Load twist (torque)
- Load curved (bent)
- Load centrifugal

 

Figure 1. crankshaft and piston

 

Generally tolerated crankshaft plain bearings are assigned to the crank chamber. Crankshaft bearings commonly called The main bearings. Kinds of crankshaft used on motorcycle engines are:
1. Built-up type used on small motorcycles that have number one or two cylinders

Figure 2. The crank shaft type Built Up

 2. This type of "one piece", used on large motorcycles have a a lot number of cylinders.

Figure 3. Type One Piece Crank Shaft

For a single-cylinder motorcycle in the crank shaft (usually pen before crank) as counter weights placed balancing of crank rotation when working under pressure piston. But a lot cylinder motors, each be installed crank pen offset. Heavy counter weights approximately equal to the weight of the rod added to the weight of the piston at full crank. as such  The crankshaft can be balanced, so that it can rotate more average and crank vibrations become lost. With the weight This causes pressure on the counter bearing to be reduced and evenly.
Crankshaft and connecting rod motion is to make changes translation of the piston into rotary motion. Both parts are always suffers stresses and strains are very large. Because it must be made of  special materials and the right size. At rest and rotating crankshaft is always an equilibrium (balance). the surface hardened bearing and should be smooth to reduce wear.

Rotating crankshaft is supported by several pieces The main bearings. The number of pads depends on the number of cylinders. Four-cylinder motors have 3 pads and six-cylinder motors has 4 main bearings. These pads are made of steel mixed with Babbit or there is also the aluminum. Drive shaft and the crankshaft is made of cast iron. Installation of the crankshaft drive shaft coated with wear pads.