BELT DRIves of diffferent types and also

belt drives

1. BELT DRIVES CHAIN DRIVES & GEAR DRIVES

2. INTRODUCTION The Belts or Ropes are used to transmit power from one shaft to another shaft by means of pulley .

3. The amount of Power transmitted depends on the following factors: The Velocity ( ವೇಗ ) of the Belt. The Tension ( ಒತ್ತಡ ) under which the belt is placed on the pulleys. The arc of contact b/w the belt & smaller pulley. The conditions under which the Belts used.

4. SELECTION OF BELT DRIVES Speed of Driving & Driven Belts. Power to be transmitted. Centre distance b/w Shafts. Shafts layout. Space available. Service conditions. Speed Reduction Ratio Positive drive

5. Types of Belt drives Light Drives Medium Drives Heavy Drives Types of Belts Flat Belt V-Belt Circular or Rope Belt

6. What is a Gear? A rotary circular machine with a tooth in its structure and is used to transfer torque and speed from one shaft to another is called a gear.

7. SPUR GEAR They are cylindrical gears The tooth line which is straight and parallel to the shaft. The most popular gears are spur gears because they have a high degree of precision and can be produced with ease . They have the feature of being free of axial loads (thrust load). The bigger of the two that meshes are referred to as the gear, and the smaller as the pinion

8. BEVEL GEARS Bevel gears have a cone shaped appearance and are used to transmit force between two shafts which intersect at one point (intersecting shafts). A bevel gear has a cone as its pitch surface and its teeth are cut along the cone. Types of bevel gears are straight bevel gears, helical bevel gears, spiral bevel gears, miter gears, angular bevel gears, crown gears, zerol bevel gears and hypoid gears.

9. WORM GEAR Worms and worm wheels are the two parts of this kind of gear. The worm is a cut shaft with a screw-like form, and the worm wheel is the mating gear. T here is less friction when the surfaces glide across one another and come into contact. The worm is constructed of hard material, whereas the worm wheel is made of soft material .

10. HELICAL GEAR This is a cylindrical shaped gear with helicoid teeth. Helical gears can bear more load than spur gears, and work more quietly. The main purpose of helical gears as power transmission devices is to enhance torque and decrease speed between rotating shafts.

11. RACK & PINION A gear rack is a set of uniformly sized and formed teeth that are evenly spaced along a level surface or a straight rod. A gear rack is a cylinder-shaped gear with an infinite pitch cylinder radius. It transforms rotational momentum into linear motion by meshing with a spherical gear pinion. The two types of gear racks that feature straight tooth lines are straight mouth racks and helical tooth racks . It is feasible to join gear racks end to end by milling the ends of the gear rack.

12. COMPOUND BELT DRIVE

13. ROLLER CHAIN DRIVE