Double Chevron?
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Thread: Double Chevron?

  1. #1
    Sans Pond. STALLED's Avatar
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    Default Double Chevron?

    Heya,

    What is a "double chevron"? I know it is the badge of citroen but what exactly is a chevron, i know completely zilch about citroens

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    Cya STalled
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    Fellow Frogger! Paul Smith's Avatar
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    Hi Stalled,

    from the 'Automania' website

    http://www.autobidclub.com/history/citroen.html

    In 1913, Andrť CitroŽn, a French entrepreneur, opened a factory in Paris that made gears with peculiar chevron-shaped teeth. In the First World War, he switched to the mass production of artillery ammunition. In 1919, CitroŽn finally started producing automobiles, the first in Europe to use the American assembly line technology, making production much more cost-effective. Now CitroŽn produces over 550,000 cars per year. Its logo is a pair of stylized chevron-shaped gear teeth, the very ones that started it all.
    The background to the story is written up here

    http://www.svvs.org/citroen2.shtml

    In view of his part-Polish origin Citroen had been visiting his relatives in Poland as a child, but it was during this army period that Citroen visited Poland again, now a technically mature engineer. Precisely when, where and how he first came into contact with wooden helical gears seems to differ in most Citroen biographies. Some say he was introduced to them in Poland as a child, others that he had spent some time in Poland before his army career working with relatives conversant with helical gears, and yet others that he first saw the gears on one of his visits to Poland when on leave from the army.

    It is however apparent that at some time during his first army period he became technically aware of wooden double helical gears being used in Poland for driving water-driven machinery. He also became aware that double-helical gears ran quietly and were capable of transmitting considerable loads without damaging the wood they were made from. He was aware that the same wooden double helicals were successfully operating Lodz textile mills and could see the technical advantages if such gears could be made out of steel.

    Precise accounts as to how he eventually got to designing steel gears also differ. Some biographies say that steel double helicals had already been made by his relatives in Glowno, some say that his brother in law had the patent which he sold to Citroen, and yet others that Citroen purchased the rights to manufacture steel gears from a Russian company which was already making helical gears in Russia. The official Citroen Car Company version is that he purchased the patent rights from a man in Poland. In any event, by 1904 Citroen had left the army and had filed a patent for the double helical chevron gear to be made in steel.


    The Chevron logo is now regarded as on of the most well known in the world.

    See attached pic for a really big set of chevron gears.

    Paul
    Attached Thumbnails Attached Thumbnails Double Chevron?-chev.jpg  
    Paul Smith

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  3. #3
    Moderator Alan S's Avatar
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    Quote Originally Posted by STALLED
    Heya,

    What is a "double chevron"? I know it is the badge of citroen but what exactly is a chevron, i know completely zilch about citroens

    Cya STalled
    Read this:

    http://www.myweb.com.au/citroen/hist.../challenge.htm

    and look at this:

    http://www.myweb.com.au/citroen/hist..._gears_fds.jpg


    ...........and there's your answer. If you want to spend an interesting day, put "Andre' Citroen History" into google and read about a fascinating genius.

    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  4. #4
    1000+ Posts George 1/8th's Avatar
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    Quote Originally Posted by Alan S
    Read this:

    http://www.myweb.com.au/citroen/hist.../challenge.htm

    and look at this:

    http://www.myweb.com.au/citroen/hist..._gears_fds.jpg


    ...........and there's your answer. If you want to spend an interesting day, put "Andre' Citroen History" into google and read about a fascinating genius.

    Alan S
    Hi Guys, maybe we should mention that the Citroen cars don't actually USE double chevron gears, it's just become the Citroen LOGO.
    Cheers...George.

  5. #5
    Sans Pond. STALLED's Avatar
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    Wow, thanks alot! Pretty good read some of it!



    Cya Stalled
    2005 Renault Clio 182 Cup

    2011 Renault Megane 250 Cup Trophee - Sold

    1997 Peugeot 406 2.0 Manual - On Loan

    2004 Citroen C3 1.4 80th Anniversary (RIP)

  6. #6
    XTC
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    Well type in citroen in google image search and you'll get a whole different reason.

    <warning adult material>

    - XTC206 -
    You're not fooling everyone, or did you forget? .......




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  7. #7
    Fellow Frogger! whitegoshawk's Avatar
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    Quote Originally Posted by XTC206
    Well type in citroen in google image search and you'll get a whole different reason.

    - XTC206 -
    Yeah, but not at work!!
    "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles... Radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Albert Einstein

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  8. #8
    XTC
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    Quote Originally Posted by whitegoshawk
    Yeah, but not at work!!
    Fair call .. you'd probably breach all your "terms and conditions of employment" or interent use.... "but .. but .. but ... I was just looking for that XM shot ... honestly."

    - XTC206 -
    You're not fooling everyone, or did you forget? .......




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  9. #9
    Moderator Alan S's Avatar
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    There was a bit on the news a few months ago about some project somewhere (I think it was associated with power generation from memory) and they were having major problems with gearing due to a few factors and eventually the engineers settled on using double chevron gears as the only way to do the job.
    Needless to say ol' Andre' mananged to get a mention in despatches which strangely only mentioned his engineering prowess as well as his development of them and referred to him as an "Industrialist" and only made passing mention of his association with Citroen cars so he was given the credit based on his ability rather than his reputation.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  10. #10
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by Alan S
    There was a bit on the news a few months ago about some project somewhere (I think it was associated with power generation from memory) and they were having major problems with gearing due to a few factors and eventually the engineers settled on using double chevron gears as the only way to do the job.
    Needless to say ol' Andre' mananged to get a mention in despatches which strangely only mentioned his engineering prowess as well as his development of them and referred to him as an "Industrialist" and only made passing mention of his association with Citroen cars so he was given the credit based on his ability rather than his reputation.


    Alan S
    Too add a bit more, the key aspect of the double helical gear configuration is that it doesn't impart any end thrust on either shaft. So you get the strength and quite running of a helical gear without the end thrust, allowing heavy duty power transmission more easily than with a single helical gear. Citroen industrial gears were (?are - don't know) found world-wide in their time.

    JohnW

  11. #11
    Fellow Frogger! Mort Subite's Avatar
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    ....blimey.... sod readin' all that guff.

    From memory (and I am happy to stand corrected) a chevron is an heraldic device or 'partition' as seen on "coat of arms", and they predate M. Citroen and his 'herringbone' pattern gear teeth.

    Anyone for fish?

    Population per head across the planet (excluding the green men from mars) I dare say the Citroen logo is probably the best recognised, but in this "Beef-or-Chicken" country of ours its still most likely just an upside down 8 cylinder Ford decal....

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