Chain Drives
Chain drives operate on the principle of engagement. Transmit motion between two or more parallel shafts with axes. Wheels are covered by a flexible element - a chain consisting of articulated units assembled, providing the flexibility of the chain. The average value of gear ratio i is equal to the number of teeth z wheel. The elements of the chain drive are - chain, chainring and tensioner.Chains - the largest distribution chains that are used in chain drives are: roller, gear and foreign chains. In the bush roller chain bushing is rigidly connected to the inner plate and movement between the hub and axle. Roller reduces friction and wear in the chain and is used for speeds up the chain 15m / s. Gear chains run more smoothly and quietly.. Used at speeds up to 35m / s. They consist of plates, hinged together. The plates are shaped teeth that mesh with the teeth of the sprocket, coming against the teeth. Clamping circuits are constructed by axes connecting us through inner and outer plates. The axles are mounted bushings. The outer plates are riveted to the axle, and are installed in internal / axes at the possibility of rotation.The most important geometrical parameter of the chain is usually translated River pitch chains have standardized step in inches, and lifting and traction in millimeters. Chainring - the construction of wheels depends on the chain. Geometric parameters of the sprockets are standardized.Basic diameter sprockets is dividing its diameter is the diameter of the circle in which the centers of axes available when the chain is a mesh wheel. It's defined from the step p and the number of teeth z. Wheels differ in the working profile of the tooth. In gear chain profile is always linear. In roller, plate and clamping circuits teeth are shaped so allow entry and exit of the joints of the chain of engagement while providing reliable contact between the chain and sprocket. Carter - serves to protect the circuit from outside influence, to keep the smears. The internal dimensions of the crankcase to provide slack in the chain. Tensioning devices - due to wear of the joints of the chain pitch and constantly increasing, which leads to increased internal dynamic forces and noise in the work process and deepen the process of wear of the joints, so a device for tensioning the chain.
Advantages over other chain drives
- Transmission of movement of considerable distances - from a drive shaft may be driven shaft with a few chain, depending on location, some of the shafts can be rotated in the reverse direction of the drive
less load on the shafts and bearings compared to belt. High efficiency (0,94-0,98),
durable than chain strap. Disadvantages:
- dynamic loads on the chain and wheels;
- need to accurately establish the chain wheel - need not - adjusted periodically due to wear of the elements of the chain;
- high monetary value
Chain drives are used as power - for high power to 3500 kW, also in the transport and chemical engineering, in machine and others. devices.
Tools for roller chains
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