Simplified representation of gears and chains

[supergee]

Hello,

Is there a standard on how to show simplified representation of gears and chains? I see no added value to represent each tooth or each link of a chain. I can't seem to find the information on the books I have on hand.

Thanks

 

[3DDave]

I don't know of a standard. I've seen various. Pitch line and pitch diameter for representing the drive ratio. A representation of the inner and outer chain path and the OD of the sprockets for clearance drawings, sometimes with a limited arc of the gear showing the chain so the pitch is visible.

 

[supergee]

3DDave

Pitch line and pitch diameter for representing the drive ratio. A representation of the inner and outer chain path and the OD of the sprockets for clearance drawings, sometimes with a limited arc of the gear showing the chain so the pitch is visible.

With a thin phantom line?

 

[3DDave]

I'd lean to a thicker line width, but phantom? I guess. It will need to be labeled.

 

[Wuzhee]

For simple representation, only the first tooth and the nearby half tooths may be shown, then complete with the OD circle. The pitch circle and pitch line is thin dash-line type (or dash-dot on older dwgs).
Also the teeth can be omitted completely.
OD is thick, p.c.d. is thin just as tooth bottom dia.

 

[ewh]

FWIW
Per ASME Y14.2-1992 Line Conventions and Lettering
Fig.12 PHANTOM LINE APPLICATIONS

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[cowski]

For simplified gears: ASME Y14.7.1 (old standard, no longer in effect)