Pressure plate question for the clutch manufacturers
04-20-2015, 02:03 PM
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Pressure plate question for the clutch manufacturers Dumb question for the clutch guys on here. On a "push" type diaphragm pressure plate, what locates the pressure ring in the cover? It would be very important that is stays concentric with the centerline of the stamped cover for balance reasons, but I don't see where it pilots anywhere? How is this controlled? Is it just the drive straps, or???
04-22-2015, 08:08 AM
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No one?
I am guessing that the concentricity of the pressure ring to cover can only be controlled by the drive straps and the stamped holes in the cover. I wonder how well the position is controlled in the cover holes, and whether the straps allow the pressure ring to move around at all. Can anyone shed any light on this?
I've noticed that some pressure plate manufacturers balance the whole assembly with weight added to the cover. Others only balance the pressure ring casting before it is assembled to the cover. In this case, I wonder if the assembly is really balanced, given the potential positional variation of the casting relative to cover stamping?
I am guessing that the concentricity of the pressure ring to cover can only be controlled by the drive straps and the stamped holes in the cover. I wonder how well the position is controlled in the cover holes, and whether the straps allow the pressure ring to move around at all. Can anyone shed any light on this?
I've noticed that some pressure plate manufacturers balance the whole assembly with weight added to the cover. Others only balance the pressure ring casting before it is assembled to the cover. In this case, I wonder if the assembly is really balanced, given the potential positional variation of the casting relative to cover stamping?
04-22-2015, 01:18 PM
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http://www.schaeffler.com/remotemedi...E_Lo_us_us.pdf
The three rivets connecting the cast pressure ring to the drive straps are the only physical connection between the stamped clutch cover and the casting. Remove those rivets and the casting can float around in the cover from what I can see. I am stuggling to understand how they control concentricity of these two components with just the drive straps.
04-24-2015, 12:18 PM
#5
without having one to look at first hand, my guess would be it's a circle within a circle. the pressure ring with the fingers shown as #3 on top of page 3 of your schaeffler link, see how that finger piece marked #3 has material that forms within the outer portion of the assembly but is still within the drive strap marked #5... it's the piece that isn't marked but has the black line going over it for #4 that points to the pivot ring. so you have a circle within a circle, and i wouldn't go by that drawing for dimensions but would venture a guess saying the fit is tight to where it doesn't move around, and all you would need is a few rivets to keep things contained prior to it bolted against the flywheel. it's hard to tell from that picture but it is a 2-d drawing with only X and Y dimensions, there is no Z dimension shown. if there were i'd bet there's a ridge in the pressure plate cover that locates the diaphragm spring/finger piece and keeps it centered.