POWER TRANSMISSION SYSTEMS. Mechanical power can be transmitted from one shaft to another by using...
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Transcript of POWER TRANSMISSION SYSTEMS. Mechanical power can be transmitted from one shaft to another by using...
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POWER TRANSMISSION SYSTEMS
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• Mechanical power can be transmitted from one shaft to another by using four methods– Belt drive– Rope drive– Chain drive– Gear drive
• The shaft from which power is transmitted is called driver shaft and the shaft to which power is transmitted is called driven shaft
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BELT DRIVE1. A belt is a looped strip of flexible material, used to
mechanically link two or more rotating shafts.
2. They may be used as a source of motion, to efficiently transmit power, or to track relative movement. Belts are looped over pulleys.
3. In a two pulley system, the belt can either drive the pulleys in the same direction, or the belt may be crossed, so that the direction of the shafts is opposite.
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TYPES OF BELTS
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OPEN BELT DRIVE
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• It is used with shafts arranged in parallel and to be rotated in same direction.
• The driver pulley pulls the belt from one side and delivers the same to the other side.
• Side where tension is more is called tight side and the other side is called slack side
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CROSS BELT DRIVE
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• It used with shafts arranged in parallel and to be rotated in opposite direction.
• At the point where belts crosses, it rubs against itself and wears.
• Shafts are placed at a minimum distance of 20b to minimize the wear.
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Length of belt
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CHAIN DRIVE
• It consists of an endless chain running over toothed wheel. Toothed wheel is called sprocket.
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• The smaller sprocket is called pinion and the bigger one is called wheel.
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• Based on application we can classify chains as
1) Power transmission chains
2) Pulling chainsUsed in elevators
3) Hoisting chains Used in lifting loads
CLASSIFICATION OF CHAINS
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TYPES OF POWER TRANSMITTING CHAINS
1. ROLLER CHAIN
2. SILENT OR INVERTED TOOTH CHAIN
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1 Outer plate 2 Inner plate 3 Pin4 Bushing 5 Roller
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ROLLER CHAIN
• It consists of rollers, bushes, pins, inner plates and outer plates.
• The pin passes centrally through the bush and the roller surrounds the bush.
• The bush moves freely on the roller and the roller moves freely on the bush.
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• Bushes are held together by outer plates.
• Rollers are held together by inner plates.
• To prevent the lateral movement of the outer plates the pin ends are hammered in the shape of a rivet head.
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Inverted tooth chain
• It is employed when heavier loads are to be transmitted and maximum quietness is desired
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GEAR DRIVE
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• Gear is a term used to generally denote toothed wheels.
• For transmitting power one gear will be mounted on driving shaft and the other will be mounted on driven shaft.
• The teeth's of the gears will be meshed with each other
• The distance between the shafts must be sufficient to enable meshing of the gear tooth.
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Gear materials
• For heavy duty – cast steel and alloy steel
• For corrosive environment – Non ferrous materials (phosphor bronze, nickel, manganese)
• The cheapest material – Grey iron
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SPUR GEARIn this the teeth will be cut parallel to the shaft
Used to transmit power between parallel shafts