Main reason is COST O S T They're much harder to manufacture: basically you either need to double the number of gears, or have some crazy ass machining process that's unsustainable. Plus they're self-centering in one direction, they're unstable in the opposite direction (yes, helicals are also unstable but they're unstable in a predictable direction, unlike wishbone gears). And the gains from them are very marginal.
>>14206557 You really don't know how manufacturing processes work. A cast gear blank couldn't include the gear tooth profile because it is typically undercut - and even if you use a profile shifted gear you would still need cleanup operations on the contacting surfaces.
Gears are typically cast as cylinders, the teeth cut with a special cutting head and then they will use flame or induction heat to case-harden the teeth (harden the exterior to a certain depth).
The reason double helical aren't used is because they are expensive - you might think it's just one more cutting operation but the logistics of changing tooling and such on a production line when you could just spec a bigger bearing on one end of the shaft and not have to worry about multiple cuts makes it extremely unattractive to most companies.
TLDR; because bigger bearings are cheaper than double helical gears.
>>14206557 >dye forged. I don't think they were ever forged. Either way, the ones today are machined from low carbon steel, case hardened, then ground/polished. Some cheaper, older stuff is roll forged and then hardened, but smoother, more accurate gears => >NVH >empeegees
I hate people who see a tidbit on something and try to project like they're seasoned experts. If you've ever actually spent significant time around a specific subject, then caught the 1 hour special on it, you'd know that they're just introductions for normies, they're not actually informative. Going around parroting them like you've spent decades in the industry just makes you look retarded to people who actually have.
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