Citroen and his gears

There's me thinking for years the double arrow heads were representing hydraulic lift suspension...

So ,they're double helical gear teeth actually ! Every day's a school day..

How are they cut then ? I can see pics on the internet , of gears with a gap in the middle,so a cutting tool could run into the gap. and ones with a radius in the base of the V could be end milled ? . These ones appear sharp in the V though...

Edited By Hacksaw on 01/06/2017 22:55:24

My best try is a two part rim/tyre construction pinned together and also fairly flimsy when looking at a collapsed tooth on the third gear from the left (foreground cluster) above centre line. Nathan.

A shaper could make those Citroen gears easily, with a good operator. I'd be surprised if Mr Citroen did not build their own special shaping machines for making them.

See this thread on herringbone gears:

**LINK**

Andrew

Hi all,

I beleive that Mr Citroen was in engineering before making car's.........

and by 1928, my Citroen C4 uses straight cut spur gears....

is this gear box from a truck ?

notice all the oil feed pipes...

clogs

Doh... how did i miss that thread ?

Its a headstock i believe

I believe Monsieur Citroen actualy bought the patent for the herringbone gears from an impoverished Polish engineer. They were often used in mine winding equipment because the gears were self centering, and could not come out of mesh.

Unlike the gears in the original BMC Mini gearbox! They were single helicals and a stack of them were retained on a splined shaft with a nut and lock-tab washer. When the lock-tab washer failed (not a rare event) and the nut loosened, the side thrust caused the gears to slide along the shaft and put the transmission into an illicit neutral.

The only benefit when this happened to me and I got a friend to tow me home was that the car thieves who tried to steal the car that night didn't get very far!

I believe that marine gearboxes use BIG double helicals, some made, once upon a time, by Browns of Manchester (?) on a machine floating on a pool of mercury. (Urban myth??)

Best regards,

Swarf, Mostly!

Edited By Swarf, Mostly! on 03/06/2017 16:08:58

Edited By Swarf, Mostly! on 03/06/2017 16:09:20

Apparently Citroen is the Dutch word for a Lemon. I've driven quite a few lemons in my time, most of them bought when BL were going pear shaped...

Edited By Carl Wilson 4 on 03/06/2017 18:32:47

Ah so that was what was behind that characteristic sound of the buses when I was a boy. A 'pshhht' every time it changed gear?

Neil