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Gears are a crucial part of many automobile vehicles. Gears help increase delivered torque by providing a reduction in gear and adjusting the direction of rotation like the axle of the rear wheels of motor vehicles. Following are some basic types of gears & how they differ from each other.
Spur gears in Types of Final Drive
Spur gears are mounted in series on parallel shafts to achieve large gear reductions in the types of final drive.
The most common gears are spur gears and are used in series for large reductions. Spur gear teeth are straight and mounted in parallel on different axes. Spur gears are used in washing machines, screwdrivers, winding alarms, and other devices.
These are particularly noisy, due to the engagement and collision of the gear teeth. Each impact produces loud noises and vibrations, which is why spur gears are not used in machinery such as automobiles. A typical gear ratio range is 1: 1 to 6: 1
Helical Gears in Types of Final Drive
Helical gears run smoother and quieter than spur gears due to the way the teeth interact. The teeth of a worm gear cut at an angle to the face of the gear. When two of the teeth begin to engage, contact is gradual, starting at one end of the tooth and maintaining contact while the gear rotates fully engaged. The helix angle range is about 15-30 degrees.
The thrust load varies directly with the magnitude of the tangent of the helix angle. The helical gear is the most widely used gear in transmissions. They also generate large amounts of thrust and use bearings to support the thrust load. Helical gears can be used to adjust the angle of rotation by 90 degrees. When mounted on perpendicular shafts, its average gear ratio range is 3: 2 to 10: 1.
Bevel gears in Types of Final Drive
Bevel gears are used to change the direction of rotation of a shaft. Bevel gears have teeth that come in a straight spiral. Spurs have similar characteristics to spur gears and also punch when engaged. As with spur gears, the normal gear ratio range for spur bevel gears is 3: 2 to 5: 1.
Worm gears in Types of Final Drive
Helical gears are used in large gear reductions. The typical gear ratio is between 5: 1 and 300: 1. The setting is designed so that the worm can turn the gear, but the gear cannot turn the worm. The angle of the worm is shallow, and as a result, the gear is held in place due to the friction between the two. The gear is found in applications such as transport systems where the locking function can act as a brake
