Design of bevel gear pdf

90 degrees to drive the wheels. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight teeth. Design of bevel gear pdf spiral bevel gear set should always be replaced in pairs i.

In hypoid gear design, the pinion and gear are practically always of opposite hand, and the spiral angle of the pinion is usually larger than that of the gear. The hypoid pinion is then larger in diameter than an equivalent bevel pinion. Hypoid gearings are used in power transmission products that are more efficient than conventional worm gearing. They are considerably stronger in that any load is conveyed through multiple teeth simultaneously.

By contrast, bevel gears are loaded through one tooth at a time. The multiple contacts of hypoid gearing, with proper lubrication, can be nearly silent, as well. The spiral angle in a spiral bevel gear is the angle between the tooth trace and an element of the pitch cone, and corresponds to the helix angle in helical teeth. Mean spiral angle is the specific designation for the spiral angle at the mean cone distance in a bevel gear.

Outer spiral angle is the spiral angle of a bevel gear at the outer cone distance. Inner spiral angle is the spiral angle of a bevel gear at the inner cone distance. Hypoid gears are stronger, operate more quietly and can be used for higher reduction ratios, however they also have some sliding action along the teeth, which reduces mechanical efficiency, the energy losses being in the form of heat produced in the gear surfaces and the lubricating fluid. A higher hypoid offset allows the gear to transmit higher torque. For practical purposes, it is often impossible to replace low efficiency hypoid gears with more efficient spiral bevel gears in automotive use because the spiral bevel gear would need a much larger diameter to transmit the same torque. Another advantage of hypoid gear is that the ring gear of the differential and the input pinion gear are both hypoid. In most passenger cars this allows the pinion to be offset to the bottom of the crown wheel.

This provides for longer tooth contact and allows the shaft that drives the pinion to be lowered, reducing the “hump” intrusion in the passenger compartment floor. However, the greater the displacement of the input shaft axis from the crown wheel axis, the lower the mechanical efficiency. This page was last edited on 8 February 2018, at 08:20. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. Bevel gear on roller shutter door.


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