Register to reply

Loads on hinge bearings?

by ghobbs
Tags: bearings, hinge, loads
Share this thread:
ghobbs
#1
Jul30-14, 11:48 AM
P: 10
Hi. I have a door mounted on 2 hinges, aligned on a vertical axis. The hinge shafts run in flanged plain bushes.

I'm trying to work out what forces the flanged bushes will see. The door weighs 100Kg, with the centre of mass at the centre of the door. The door is 2m wide and 2m vertically between hinges.

I think that the flanges will see the mass of the door, i.e. each flange sees 500N.

The bushes will also see radial forces, counteracting the moment of the door about the hinges. Based on the moment and geometry, will the top bush see 1000N and the lower bush -1000N?
Phys.Org News Partner Physics news on Phys.org
New complex oxides could advance memory devices
Nature's designs inspire research into new light-based technologies
UCI team is first to capture motion of single molecule in real time
CWatters
#2
Jul30-14, 05:15 PM
P: 3,264
my experience is limited to hanging a field gate. In that case its impossible to get both hinges to share the load because they are never the same distance apart. One or the other "bottoms out" first and carries the vertical load.
sophiecentaur
#3
Jul30-14, 05:34 PM
Sci Advisor
Thanks
PF Gold
sophiecentaur's Avatar
P: 12,267
As CW wrote, only one of the hinges will have a shear / vertical force on it but the upper hinge will have a force outwards and the lower will have a force inwards. This simple setup gives the horizontal forces as + and - 500N, assuming the cm of the door is half way between the levels of the hinges the total moment being 1000Nm and each hinge provides half the necessary torque against this( 500+500, one way = 1000 the other way). Unless you have some resilience in the hinge mountings plus some way of fine adjustment of the vertical height of the hinges, you can't be sure which hinge will take all the additional vertical load of 1000N.

ghobbs
#4
Jul31-14, 09:52 AM
P: 10
Loads on hinge bearings?

Ah yes, I understand now. Thanks for the clarification.


Register to reply

Related Discussions
Loads on bearings of winch General Engineering 6
ATV quad, front wheel ball bearings not tappered roller bearings. Mechanical Engineering 1
Air Bearings Mechanical Engineering 0
Bronze bearings vs brass bearings Mechanical Engineering 0
Point Loads & Running Loads General Engineering 2