Linkage pushrod mechanism design
Linkage pushrod mechanism design
(OP)
Hi,
I have what I think is a simple problem to solve but I just do not know the details of the correct way to do it. I need to connect a lever arm to a push-rod by rod end bearing similar to this https://www.ondrives.com/bem-05lh-ss.
My question is what kind of pin or fastener should be used to connect the two items without any play/float in the linkage? If the hole bores are 5mm should I size a Transition Fit 5mm pin between them and fasten retaining nuts to threaded ends? Should i used busings in the bore?
Thanks for any help you can give
Richard
I have what I think is a simple problem to solve but I just do not know the details of the correct way to do it. I need to connect a lever arm to a push-rod by rod end bearing similar to this https://www.ondrives.com/bem-05lh-ss.
My question is what kind of pin or fastener should be used to connect the two items without any play/float in the linkage? If the hole bores are 5mm should I size a Transition Fit 5mm pin between them and fasten retaining nuts to threaded ends? Should i used busings in the bore?
Thanks for any help you can give
Richard





RE: Linkage pushrod mechanism design
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Linkage pushrod mechanism design
RE: Linkage pushrod mechanism design
Then by definition a transition fit will not do. You will need and interference fit.
RE: Linkage pushrod mechanism design
http://images2.mcmaster.com/mvA/contents/gfx/large...
http://www.mcmaster.com/#rod-ends/=11614y6
RE: Linkage pushrod mechanism design
the normal approach (at least in my business) is to tap the hole and to secure the rod-end with a jam nut. If you want to lock it down tight, add an anti-rotation device for the jam nut
another day in paradise, or is paradise one day closer ?
RE: Linkage pushrod mechanism design
RE: Linkage pushrod mechanism design
Do you R-E-A-L-L-Y need zero clearance ?
0.002" radial clearance would not suffice?
How much force must these 5 mm pivot shafts endure?
Through how many degrees must the linkages pivot?
How may cycles?
What is the environment?
Possibilities I'd be considering, with the limited input you provided.
true, zero clearance
1 - those hinges made from thin metal plate. ( 90 degree motion or so )
2 - plastic "living" hinges. http://www.spencerindustries.com/index.cfm?pfile=P... ( 90 degree motion or so )
3 - axially preloaded tapered bushings ( full rotation )
4 - axially preloaded tapered roller bearings ( full rotation )
5 - axially preloaded ball bearings ( full rotation )
Low radial force required - castellated metal or plastic bushings that snap onto the shaft with negative clearance, but low radial force.
Preloaded ball and socket joints, hydraulically preloaded as done many millions of times as shown here -
http://grumpysperformance.com/oilpassage.jpg
RE: Linkage pushrod mechanism design
RE: Linkage pushrod mechanism design