Talk:Spiral bevel gear

Nikola J. Terbo
Funny there is no mention of Nikola J. Terbo ? see http://mainfiancial.com/know-how/1503.html — Preceding unsigned comment added by 108.243.106.82 (talk) 18:58, 14 August 2019 (UTC)

Hypoid vs Spiral
I'm not totally clear on the difference between hypoid gears and spiral bevel gears myself, but I certainly don't see how "hypoid gear" can redirect here, and then this article can have a section contrasting hypoid gears with spiral bevel gears. They either are the same, or they're not. Let's clear that up. Also, this is an old an venerable engineering topic---this article needs citations desperately.

Pygmy goat (talk) 21:10, 7 October 2014 (UTC)


 * They don't differ, but hypoids are a subset of spirals. Andy Dingley (talk) 21:21, 7 October 2014 (UTC)
 * Not quite correct. "Bevel" and "hypoid" are designations separate from "straight cut" and "spiral/helical". Bevel gears have intersecting axes and hypoid do not, that is how they are differentiated. You could say that bevel gears are a special case of hypoid gears where the offset of the axes is zero.
 * "Straight cut" or "spiral (or helical)" are other designations. In the case of straight cut bevel gears, the pinion has teeth parallel to the axis of the gear, whereas the crown wheel has teeth in the radial direction, both "straight" in that respect. Straight gears are only possible in the bevel (zero offset) case, whereas hypoid gears require some particular form of distortion to mate.
 * The idea of the spiral/helical shape in any gear type is that the driving pair of teeth still have contact at the end of their cycle when the next pair of teeth engage. There is a smooth handover of torque from one pair to the next, as the spiral/helix partially overlaps. With straight gears, the torque is passed instantaneously from one tooth pair to the next. Pdr0663 (talk) 06:59, 19 September 2023 (UTC)

That is my understand as well. Hypoid gears are a subset of spiral bevel gears where the pinion axis and gear axis do not coincide (i.e. a less dramatic but similar case to a Worm drive). A technical manual of the geometric architecture of spiral bevel and hypoid gearing would be helpful in clearing up this issue. Kellyyh (talk) 18:24, 4 July 2015 (UTC)

Facts, please
Hypoid gears are nearly universal in right angle drives. To say that some trucks still use them is inaccurate. It would be far more valuable to dig out just when machinist expertise and metallurgical alloys were adequate to pursue this design. (I would guess in the 1920s, but I will look more before making such a statement.) Also, it should be stated that with a hypoid gearset, multiple teeth are giving and receiving torque simultaneously. (worm-sector and bevel gear sets involve nearly all power on one tooth each of the driven gear and the rotated gear--much more likely to fail through breakage) It might not be an overstatement to suggest that the hypoid gears in the differential of a modern front drive or rear drive automobile or truck is the mechanical component least likely to fail, even after hundreds of thousands of miles.

A hypoid gearset is also one of the quietest ways to arrange a right angle power transfer. —Preceding unsigned comment added by 75.41.34.187 (talk) 23:17, 10 January 2010 (UTC)

Merger proposal
Both Spiral angle and Spiral bevel gear have the same creator and the same single source. I don't think Spiral angle is deserving of an article of its own (yet), so I propose Spiral angle be merged into Spiral bevel gear. In the absence of reasonable objections (and once I find the time), I'll perform the merge. -FrankTobia 18:37, 12 November 2007 (UTC)

77.96.223.109 (talk) 11:46, 15 May 2008 (UTC)

I would suggest having a seperate page for spiral angles, but with links to spiral bevel gears?

- Greenfrog

77.96.223.109 (talk) 11:46, 15 May 2008 (UTC)

Since there was no activity on this front in a long time I went ahead and did the following:
 * Merged the spiral angle article to this article
 * Merged the hypoid article to this article
 * Moved some content from the Bevel Gear article to this article

All in all I think this cleans things up a lot and reduces the number of small (like 1 paragraph) articles.

Dhollm (talk) 00:04, 19 December 2008 (UTC)

Hypoid links
From the hypoid article (now redirected here) discussion page:

http://images.google.co.in/images?q=tbn:wLfKIBkrJ-03UM:www.zakgear.com/Zak_hypoid_1.jpg

http://gemini.tntech.edu/~slc3675/me361/lecture/grnts4.html MalFarrelle 13:07, 27 September 2006 (UTC)

Dhollm (talk) 00:04, 19 December 2008 (UTC)

Advertising
Someone has inserted links to www.spiralbevel.com all over these articles. As it seemed inappropriate in most cases I have removed the links.

Dhollm (talk) 00:04, 19 December 2008 (UTC)