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BMW Dry Clutch Configuration
- Thread starter bigbear
- Start date
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- Tags
- clutch design
pglaves
#13338
Well, I think the answer is simple. In most cars the pedal pulls the pressure plate away from the disk and on BMW motorcycles t pushes the pressure plate spring away from the disk.
It could be that the design was to ensure that the clutch disc would not engage to the flywheel. Advantage of this is when the clutch is replaced the flywheel would not have to machined flat due to wear. On the newer models the flywheel is now a piece of stamped steel called the clutch carrier. The flywheel on my /5 is solid steel like what is in a car or truck. Probably cost less to make a clutch carrier and lighter too.
beemerchuck
Member
Dry clutch design
I think it was just a packaging decision. By moving the diaphragm spring ahead of the clutch they could eliminate the normal release bearing and actuating arm. With the clutch release rod passing thru the input shaft it shorten the trans length considerably. With the small diameter rod it could ride directly on the spring without causing much wear. This allowed for the normal large throw out bearing to be much smaller and at the rear of the trans where it is easily serviced. Actually quire a brilliant packaging solution.
I think it was just a packaging decision. By moving the diaphragm spring ahead of the clutch they could eliminate the normal release bearing and actuating arm. With the clutch release rod passing thru the input shaft it shorten the trans length considerably. With the small diameter rod it could ride directly on the spring without causing much wear. This allowed for the normal large throw out bearing to be much smaller and at the rear of the trans where it is easily serviced. Actually quire a brilliant packaging solution.
pappy35
New member
I thought there was no throw out bearing on the clutch itself? The actuator rod applies no pressure to the spring plate when the clutch is disengaged (I get confused with this wording sometimes, I mean in-gear and driving the rear wheel). When engaged the slave cylinder has a bearing in it that the rod spins on. Is this correct?
beemerchuck
Member
Right, no throw out bearing in the clutch. It on the back end of the pushrod. In a housing on the trans rear cover on all cable operated clutches and in the slave cylinder of the hydraulic operated ones.
