Two helical gears of the same hand and a 45° helix angle are in mesh. The shaft of the two gears would be at following angle to each:

Question

Question

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NPCIL Stipendiary Trainee ME 2018

Answer 1

Explanation:

Helical Gear:

In a helical gear, the teeth are cut at an angle to the axis of rotation. It is used to transmit power between two parallel shafts.

helical

Types of Helical gears

Crossed Helical gears

These are used for shafts, which are not parallel. their teeth may have the same or different hand of helix depending on hte angle between the axes of the shafts.
For 90° angle between shafts, helix angle of both the gears is same as 45° and use the same hand.
Salient features for these gears are:
- Owing to curvature of tooth surfaces, it does not have line contact, but a point contact
- Owing to small contact area of these gears, load capacity is low.
- Owing to small contact area and high loads, wear is also high.