Stable and unstable configuration of double helical gear

In summary, the conversation discusses the concept of gear alignment and the difference between stable and unstable configurations. The stable configuration occurs when the cave in one gear's "V" teeth drives the arrow of the other "V", while the unstable configuration occurs when the arrow part of one gear's "V" drives the cave of the other. The direction of motion is assumed to be up and the question is raised about which gear should be realigned in each configuration. The net force/thrust on each gear is also mentioned and it is noted that while one gear is being aligned back into its desired position, the other is being further misaligned. The concept of axial misalignment is also briefly mentioned.
  • #1
hihiip201
170
0
Hi :

according to :https://en.wikipedia.org/wiki/Gear#Helicalthe stable configuration is when the cave in one of the gear's "V" teeth drives the arrow of the other "V".where unstable configuration is when the arrow part of V drives the cave of the other Vso assuming the direction of motion is up

unstable : ^ stable V (how the teeth in contact looks like from above)
my question is : do we want to re allign the driving gear or the pinion? because while the driving gear may re-allign itself in the stable configuraiton, the pinion would tend to crock more to the other direction. and vice versa with unstable configuration.on the wikipage when they say netforce/thrust, I am assuming that are talking about the net force/thrust on each of the gears (or else that would be an internal force)

while one gear is pushed to the left, the other is pushed to the right, which means while one gear is being alligned back into it's desired position, the other is being misallign even more.

like this:
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Last edited:
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  • #2
oh or maybe they are referring to the other type of axial misalignment?
 

FAQ: Stable and unstable configuration of double helical gear

What is a double helical gear?

A double helical gear is a type of gear that consists of two parallel, helically-shaped teeth that are arranged in a V-shape around the center of the gear. This design allows for smoother and quieter operation compared to traditional spur gears.

How does the configuration of double helical gears affect their stability?

The configuration of double helical gears can greatly impact their stability. If the helix angle (the angle at which the teeth are cut) is too large, it can cause the gears to be unstable and prone to slipping. On the other hand, a smaller helix angle can increase stability but may also lead to more noise and vibration.

What factors contribute to an unstable double helical gear configuration?

There are several factors that can contribute to an unstable configuration of double helical gears. These include improper helix angle, insufficient backlash (the space between the teeth of the gears), uneven contact between the teeth, and inadequate lubrication.

How can the stability of double helical gears be improved?

To improve the stability of double helical gears, it is important to ensure that the helix angle is properly calculated and cut, the backlash is within the recommended range, and there is sufficient lubrication. It is also beneficial to use high-quality materials and precision manufacturing techniques.

What are the advantages of using stable double helical gears?

The use of stable double helical gears offers several advantages. These include smoother and quieter operation, reduced wear and tear on the gears, improved efficiency, and increased load capacity. Additionally, stable gears are less likely to experience premature failure, resulting in longer gear life and reduced maintenance costs.

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