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Wet Clutch/Dry Clutch...Wet Sleeve/Dry Sleeve

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Glenn F.

02-28-2008 15:47:32

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Would someone please tell me the pros/cons of wet clutch vs. dry clutch and wet sleeve vs. dry sleeve. I understand oil lubricates (cools), and water cools. Other than that I have never really studied into the two different designs.

Why do the two exist?

Thank you,
Glenn F.

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guido

03-03-2008 12:33:30

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Re: Wet Clutch/Dry Clutch...Wet Sleeve/Dry Sleeve in reply to Glenn F., 02-28-2008 15:47:32

Hello Glenn F.
A wet clutch is basically the same as a clutch pack in an automatic transmission's clutch pack.
The only difference is that is ingaged with pressure plate pressure, rather then oil pressure.
The bell housing has oil in it, with seals for the started motor and any other place may be needed for the application. Last one I have seen was in 1971 or 1972. Don't know if they are still beying made. My experience with them is from the trucking industry on road applications. The best thing about those clutches was that the driver could not slip them, it was eather engaged or released! UPS had a bunch of them for the class 8 trucks. The clutch also had an air cylinder to operate the clutch lever insted of linkcage! More stuff to adjust. The gear shift lever was also air operated!
Guido.

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Jon Hagen

02-28-2008 16:53:10

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Re: Wet Clutch/Dry Clutch...Wet Sleeve/Dry Sleeve in reply to Glenn F., 02-28-2008 15:47:32

Wet sleeve has the advantage of the shortest path for heat transfer from the cylinder to the liquid coolant. The down side is with the coolant in direct contact with the outside of the sleeve, you have the potential for coolant leaks at the seals where the sleeve/block/head meet, plus the chance of cavitation damage to the wet sleeve.

Dry sleeve has a longer path for heat transfer from dry sleeve to block to coolant, also takes precise fit of the block and sleeve exterior to get good sleeve to block contact for good heat transfer. The up side is that the potential for coolant leaks is much less than a wet sleeve.

Dry clutch is simple to build and up to the job in most cases.

Wet clutch has the advantage of running in oil to lubricate and cool it in severe use, so they are long lived under heavy use.

The down side is that a wet clutch makes it much more complicated to seal the clutch oil from leaking into the starter,engine and transmission, or leaking out of the clutch housing.

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ldj

02-28-2008 19:21:40

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Re: Wet Clutch/Dry Clutch...Wet Sleeve/Dry Sleeve in reply to Jon Hagen, 02-28-2008 16:53:10

what keeps wet clutch from slipping?

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Jon Hagen

02-28-2008 19:45:52

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Re: Wet Clutch/Dry Clutch...Wet Sleeve/Dry Sleeve in reply to ldj, 02-28-2008 19:21:40

Enough pressure and the right friction material so it can grip when saturated with oil.

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