Hypoid gears - Saab 900 Bulletin Board - Saabnet.com
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Hypoid gears
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Posted by S Carlson [Email] (more from S Carlson) on Tue, 15 Mar 2016 15:30:37 Share Post by Email
In Reply to: Re: C900 isn't hypoid., Paul Bob, Tue, 15 Mar 2016 09:07:02
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Right, 900 has the axis of the ring gear and the axis of the pinion gear interesecting. Hypoid gears are the spiral bevel gears whose don't intersect. It's like a halfway house between a worm gear and a bevel gear system.

The advantages of hypoid are many, so it's unfortunate that the 900 transmission doesn't have them. First, as Paul Bob points out, hypoid gears allow the differential to tuck up under things, providing more ground clearance. They were first used by Packard, with the aim of putting the car body lower to the ground without including a big lump in the middle of the floor for the drive shaft tunnel.

Second, and more importantly for us, hypoid gears don't load the pinion bearings the same way. Our transmissions load the pinion bearings mainly radially, with a little thrust load from the fact that the pinion is spiral-cut. Hypoid gears put a combination of radial and larger thrust loads on the pinion bearings. This is a better situation for a tapered roller bearing, which optimally would take both thrust and radial loads.

This is one idea I have for why our transmissions' pinion bearings are so failure-prone.

posted by 65.112.10...

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