In herringbone gears

Question

Question

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BPSC AE Paper 6 (Mechanical) 14 Oct 2022 Official Paper

the teeth are parallel with the axis of rotation of the gears
lateral thrust is set up by the teeth
lateral or axial thrust is neutralized
motion is transmitted between two non-parallel, non-intersecting shafts which are at right angles

Answer 1

Explanation:

Herringbone Gear:

Herringbone gears, also known as double helical gears, are a type of gear that consists of two mirrored helical gears that are placed side by side. The teeth on each gear are angled in opposite directions, which creates a "V" shape. This design helps to reduce noise and vibration that can occur in standard helical gears.

F1 Ashik Madhu 17.09.20 D8

The main advantage of herringbone gears is their ability to transmit power smoothly and quietly. The opposing angles of the teeth on the two gears cancel out any axial thrust that would occur in a standard helical gear, which can result in smoother operation and less wear and tear on the gears.
Another advantage of herringbone gears is their ability to handle higher loads than other types of gears. The design of the gear teeth provides a larger surface area for contact between the gears, which allows for greater torque transmission and higher power transfer.
However, herringbone gears can be more difficult and expensive to manufacture than other types of gears, due to the complexity of their design. The two helical gears must be precisely aligned and positioned to ensure that the teeth mesh properly and the opposing angles cancel out the axial thrust. This requires greater manufacturing precision and accuracy, which can drive up the cost of production.