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Old 07-17-2004, 09:10 AM
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How to decide the Hinge axis for car Door:)

I have few questions

1. How to Decide the Hinge axis for door ?

2. Is there a mathematical relation between hinge axis & CG of the door?

3. What should be the optimum Hinge axis inclination , for better door closing effort?

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Old 07-17-2004, 10:18 AM
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All the ones I have seen are perpendicular to the ground and parallel to the body, any other configuration would cause the door to swing open or hold shut when unlatched.

Common sense...no?
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Old 07-17-2004, 10:42 AM
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Duplicate question. Newbie posted this in the Introduction forum but it has since been moved to the body section. Moderator should merge the two.
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Old 07-17-2004, 11:09 AM
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Re: How to decide the Hinge axis for car Door:)

Quote:
Originally posted by keshava
I have few questions

3. What should be the optimum Hinge axis inclination , for better door closing effort?
Find a copy of "Strength Of Materials" by John N. Cernica, published by Holt, Rinehart and Winston, Inc. ISBN 03-0531950-0. It has all the information you need.

Prerequisites include Metallurgy, Physics, Algebra and Trigonometry. The math involved could take up to 3 pages of a notebook. Factors such as hinge to door angle, hing angle, hinge strength, hinge mounting hardware, hinge material, hinge support material, maximum stress, door length, weight and material, etc... all have to be considered to find the optimum design.
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Old 07-20-2004, 04:26 AM
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Re: Re: How to decide the Hinge axis for car Door:)

Quote:
Originally posted by 66Caprice
Find a copy of "Strength Of Materials" by John N. Cernica, published by Holt, Rinehart and Winston, Inc. ISBN 03-0531950-0. It has all the information you need.

Prerequisites include Metallurgy, Physics, Algebra and Trigonometry. The math involved could take up to 3 pages of a notebook. Factors such as hinge to door angle, hing angle, hinge strength, hinge mounting hardware, hinge material, hinge support material, maximum stress, door length, weight and material, etc... all have to be considered to find the optimum design.
Or go down to the wreckers and find a door that is a similar size to the one which you are planning on using. Use the hinges from that and copy the way they were installed.

Even cut out that section of the pillar/door jamb and take the whole lot.
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Old 07-20-2004, 08:04 AM
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Kenshava emailed me and asked me to just tell him what I could about how a door works in a practical sense being I certainly don't know the mathmatical formulas he was after. I told him the following. It did the trick. I think he just needed some normal language to him understand what he was reading else where or something like that. Anyway, he was happy with what I told him.


Kenshava, I don't remember ever seeing a door that it's hinges weren't perfectly vertical, with a zero degree inclination. If there was any inclination at all it would only increase opening, or closing resistance. It would lessen the opposite of course, one would increase, while the opposite would decrease.

I think the basic thought is, if the door is on a zero inclination, the weight of the door is "eliminated" from the equation. The user needs little effort to open or close a 100 lb door. If it had any inclination at all, the user would have to overcome that 100 lbs during opening or closing depending on the degree (+/-) of inclination. The hood or trunk for instance many times will have a spring that is going to "eliminate" the weight. Between it and the hinge design the weight of the lid is "neutralized". The effort to open or close it equal. At least that is the target of the engineer I would think. Some times it doesn't work out that way being they get a "bestest" result and stop or what ever, but I think equaling the effort out would be the goal.

Does that give you what you need?
Brian
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