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Thread: Helical ring and pinion gears sets with an offset pinion?

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Old 09-13-2013, 01:53 PM   #1
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Default Helical ring and pinion gears sets with an offset pinion?

Is there an rc application that uses a helical ring and pinion that has the pinion offset from the axle centerline. As I am sure many of you know the more offset the pinion is from the centerline the more tooth engagement there is. Friction increases as well as strength so there is (like everything) a trade off. This is one of the reasons that the heavily offset ford 9" is so strong for its size.

Two things I see missing from the typical rc crawler axle is the offset pinion and ring gear load bolts. I can take care of the latter but I would like to find an existing gear set.
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Old 09-13-2013, 03:28 PM   #2
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Default Re: Helical ring and pinion gears sets with an offset pinion?

I'm not aware of any gear sets like that in any scale of RC. My guess is the extremely high production cost.
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Old 09-14-2013, 01:59 AM   #3
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I was just looking at a buddy's losi 8ight today and noticed that the rear diff housing had a off center axle. Not sure if that will help or not.

Looks like the bevel gear may have been outboard instead of inboard like most center line diffs.
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Old 09-14-2013, 08:35 AM   #4
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Default Re: Helical ring and pinion gears sets with an offset pinion?

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Originally Posted by Harley View Post
I'm not aware of any gear sets like that in any scale of RC. My guess is the extremely high production cost.
What am I missing? I don't see where the cost would be any greater than the other machined helical gear sets that are on the market.
Quote:
Originally Posted by cytogen View Post
I was just looking at a buddy's losi 8ight today and noticed that the rear diff housing had a off center axle. Not sure if that will help or not.

Looks like the bevel gear may have been outboard instead of inboard like most center line diffs.
Just to clarify, I am looking for the pinion to be offset below (or above in the front diff) the axle center line. Being offset to the side doesn't improve strength.
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Old 09-14-2013, 09:00 AM   #5
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Default Re: Helical ring and pinion gears sets with an offset pinion?

We are talking about Hypoid gears


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Old 09-14-2013, 09:05 AM   #6
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Default Re: Helical ring and pinion gears sets with an offset pinion?

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What am I missing? I don't see where the cost would be any greater than the other machined helical gear sets that are on the market.
You will need a Special purpose mini machine to be built in order to cut gears that small. Look at the video I have posted. The complexity in machining the hypoid gear geometry. There are several axis of the machine that are working in a synchronized way.
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Old 09-14-2013, 10:06 PM   #7
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Default Re: Helical ring and pinion gears sets with an offset pinion?

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Originally Posted by nigels_world View Post
What am I missing? I don't see where the cost would be any greater than the other machined helical gear sets that are on the market.
They are quite a bit different to machine I believe. It's not just a helical cut.
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