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Posted: Mon May 04, 2015 7:12 am
by G-Man
I was a little bit curious about my later clutch not being a cush drive one. The outer plate and general costruction looked to me like it "ought" to be a cush drive model. I am planning to convert my CYB project to a duplex chain primary drive so I had a need to strip a clutch to replace the sprocket. Curiosity got the better of me.
The rivet heads were all ground off. And then I punched them out.
The outer plate came off to reveal..... a set of 8 cush drive rubbers and mounting posts....
Here is the sprocket with the rubbers in place. Note the cutaway on one side of the rubbers. This makes the drive more resilient in one direction than the other. Very clever engineering on the part of the Honda guys. In theory you could switch them around to change the level of cusioning to the drive. The drive and overrun stiffnesses will be different.
Here are a couple of pics of the clutch basket after an initial clean up. Notice no fancy scalloped fingers on the basket and no spiral oil groove which would 'normally' identify a cush drive clutch.
And here are the component parts. Basket, sprocket, rubbers and outer plate....
A considerable part of the weight of the clutch is the sprocket. The basket is featherlight without it. With an alloy sprocket, my CYB clutch will be a lot lighter.
G
Posted: Mon May 04, 2015 3:42 pm
by LOUD MOUSE
Adding pics is more work than typing but I'll show every part of a actual CUSH DRIVE but not with the outer basket taken apart.I'll send pics of the friction disc HONDA used through the years next. .............lm
G-Man wrote:I was a little bit curious about my later clutch not being a cush drive one. The outer plate and general costruction looked to me like it "ought" to be a cush drive model. I am planning to convert my CYB project to a duplex chain primary drive so I had a need to strip a clutch to replace the sprocket. Curiosity got the better of me.
The rivet heads were all ground off. And then I punched them out.
The outer plate came off to reveal..... a set of 8 cush drive rubbers and mounting posts....
Here is the sprocket with the rubbers in place. Note the cutaway on one side of the rubbers. This makes the drive more resilient in one direction than the other. Very clever engineering on the part of the Honda guys. In theory you could switch them around to change the level of cusioning to the drive. The drive and overrun stiffnesses will be different.
Here are a couple of pics of the clutch basket after an initial clean up. Notice no fancy scalloped fingers on the basket and no spiral oil groove which would 'normally' identify a cush drive clutch.
And here are the component parts. Basket, sprocket, rubbers and outer plate....
A considerable part of the weight of the clutch is the sprocket. The basket is featherlight without it. With an alloy sprocket, my CYB clutch will be a lot lighter.
G
Posted: Mon May 04, 2015 4:50 pm
by LOUD MOUSE
HONDA used several friction disc over the years and you will see how the changes came along.
The last ones they superseded to makes no since after they had used the 020 issue which worked better than all the previous changes.. .................lm
LOUD MOUSE wrote:Adding pics is more work than typing but I'll show every part of a actual CUSH DRIVE but not with the outer basket taken apart.I'll send pics of the friction disc HONDA used through the years next. .............lm
G-Man wrote:I was a little bit curious about my later clutch not being a cush drive one. The outer plate and general costruction looked to me like it "ought" to be a cush drive model. I am planning to convert my CYB project to a duplex chain primary drive so I had a need to strip a clutch to replace the sprocket. Curiosity got the better of me.
The rivet heads were all ground off. And then I punched them out.
The outer plate came off to reveal..... a set of 8 cush drive rubbers and mounting posts....
Here is the sprocket with the rubbers in place. Note the cutaway on one side of the rubbers. This makes the drive more resilient in one direction than the other. Very clever engineering on the part of the Honda guys. In theory you could switch them around to change the level of cusioning to the drive. The drive and overrun stiffnesses will be different.
Here are a couple of pics of the clutch basket after an initial clean up. Notice no fancy scalloped fingers on the basket and no spiral oil groove which would 'normally' identify a cush drive clutch.
And here are the component parts. Basket, sprocket, rubbers and outer plate....
A considerable part of the weight of the clutch is the sprocket. The basket is featherlight without it. With an alloy sprocket, my CYB clutch will be a lot lighter.
G
Posted: Tue May 05, 2015 12:45 am
by G-Man
LM
Many thanks for all your efforts there. Very informative. I have one clutch with all those later parts, and have now found a selection of plates, which I'll compare with with your photos.
G
Posted: Tue May 05, 2015 4:58 am
by LOUD MOUSE
Hope I have helped you and others to know the CUSH DRIVE CLUTCH. ...................lm
G-Man wrote:LM
Many thanks for all your efforts there. Very informative. I have one clutch with all those later parts, and have now found a selection of plates, which I'll compare with with your photos.
G
Posted: Tue May 05, 2015 5:58 am
by G-Man
Yes, my main aim was to use a clutch drum with some resilience rather than the solid sprocket mounting of the '61 type clutch.
My duplex chain kit for the CYB project will fit all of those clutch baskets with a resilient mounted chainwheel, so I am happy.
G
LOUD MOUSE wrote:Hope I have helped you and others to know the CUSH DRIVE CLUTCH. ...................lm
G-Man wrote:LM
Many thanks for all your efforts there. Very informative. I have one clutch with all those later parts, and have now found a selection of plates, which I'll compare with with your photos.
G
Posted: Tue May 05, 2015 6:10 am
by G-Man
Yes, my main aim was to use a clutch drum with some resilience rather than the solid sprocket mounting of the '61 type clutch.
Sprocket riveted directly to clutch drum.....
Later sprocket drives by resilient rubber spacers ....
My duplex chain kit for the CYB project will fit all of those clutch baskets with a resilient mounted chainwheel, so I am happy.
G
LOUD MOUSE wrote:Hope I have helped you and others to know the CUSH DRIVE CLUTCH. ...................lm
G-Man wrote:LM
Many thanks for all your efforts there. Very informative. I have one clutch with all those later parts, and have now found a selection of plates, which I'll compare with with your photos.
G