This is a similar principle to the Torotrac. I suppose that's the best known brand. The Myo type also uses wheels. Some use balls. Any design with friction based functioning components is going to be limited to lesser loads. Snapper lawn movers also had a wheel based CVT over 30 years ago. I've just completed my design for a CVT that has zero possibility of slippage. Built a rough prototype, worked out the details on paper and am now looking for funding. Have no patent protection yet.
@MECCNUTTY Not familiar with Meccano. Assume it's an available collection of mechanical parts. Like Lego? However, my CVT is 100% mechanical using 100% off the shelf type parts. Nothing is oddly shaped or difficult to machine. If you hear of anyone interested in that, let me know. Thanks.
Yesterday I was driving down the road and saw a familly eating the grass on the shoulder. I asked the father why they were doing this and he said they were so poor that they couldn't buy groceries. I felt sorry for them and told them to come with me and I would give them all a full meal. We went to my house and I took them to the back yard. I said "I haven't mowed the yard for two months and the grass it up to your knees." "Feel free to eat as much as you want".
@gregryf I found a reference to lambert friction gearing, though it seems it had limited success. Also there is variomatic used on some cars in the 1970's
@MECCNUTTY Thanks. I would like to come up with a type of variable speed transmission which could be made by an individual with limited means and equipment. Friction drive seems like the simplest. I would appreciate any ideas you could give me. Again, thanks
@gregryf Sorry cannot find anything on how to do this. I assume in a real life application the friction so generated would cause the gearbox to overheat quickly, just as you should not let a car clutch slip for very long.
@MECCNUTTY Actually the Lambert friction drive unit gave me an idea. Seems like it wouldn't be too hard to fabricate and if it worked on a car of any kind, it would work for what I'd like to do. I've been wanting to build a three wheel motorcycle and something simillar to this might work, I'd try to use three driven disks instead of two. They would be driven by a sliding cone and would in turn drive the output shaft by pulleys. Does it sound like it would work?
@MECCNUTTY With the proper tensioning and if made heavy and large enough and with the right materials, there should be no slippage. After all a belt drive is just another kind of friction drive and belt drive has many applications. The secret in my case, of course, would be the size of the contact area. With three driven disks, made wide enough, it might work.
@gregryf I found this picture on variomatic, looks quite interesting. The URL won't paste here so go to google and search on Meccano variomatic. It is the nzmeccano link.
@MECCNUTTY Yes, I've seen that one. It's probably beyond my ability to fabricate. I suppose the best thing would be to just go ahead and buy a drive system for a snowmobile. Thanks.
This is a similar principle to the Torotrac. I suppose that's the best known brand. The Myo type also uses wheels. Some use balls. Any design with friction based functioning components is going to be limited to lesser loads. Snapper lawn movers also had a wheel based CVT over 30 years ago. I've just completed my design for a CVT that has zero possibility of slippage. Built a rough prototype, worked out the details on paper and am now looking for funding. Have no patent protection yet.
1waymaster 2 months ago
@1waymaster Best of luck on that. No slippage! probably not achievable in Meccano.
MECCNUTTY 1 month ago
@MECCNUTTY Not familiar with Meccano. Assume it's an available collection of mechanical parts. Like Lego? However, my CVT is 100% mechanical using 100% off the shelf type parts. Nothing is oddly shaped or difficult to machine. If you hear of anyone interested in that, let me know. Thanks.
1waymaster 1 month ago
Yesterday I was driving down the road and saw a familly eating the grass on the shoulder. I asked the father why they were doing this and he said they were so poor that they couldn't buy groceries. I felt sorry for them and told them to come with me and I would give them all a full meal. We went to my house and I took them to the back yard. I said "I haven't mowed the yard for two months and the grass it up to your knees." "Feel free to eat as much as you want".
gregryf 4 seconds ago
gregryf 1 year ago
Would a friction drive unit of any type be applicable to any type of motor vehicle?
gregryf 1 year ago
@gregryf I found a reference to lambert friction gearing, though it seems it had limited success. Also there is variomatic used on some cars in the 1970's
MECCNUTTY 1 year ago
@MECCNUTTY Thanks. I would like to come up with a type of variable speed transmission which could be made by an individual with limited means and equipment. Friction drive seems like the simplest. I would appreciate any ideas you could give me. Again, thanks
gregryf 1 year ago
@gregryf Sorry cannot find anything on how to do this. I assume in a real life application the friction so generated would cause the gearbox to overheat quickly, just as you should not let a car clutch slip for very long.
MECCNUTTY 1 year ago
@MECCNUTTY Actually the Lambert friction drive unit gave me an idea. Seems like it wouldn't be too hard to fabricate and if it worked on a car of any kind, it would work for what I'd like to do. I've been wanting to build a three wheel motorcycle and something simillar to this might work, I'd try to use three driven disks instead of two. They would be driven by a sliding cone and would in turn drive the output shaft by pulleys. Does it sound like it would work?
gregryf 1 year ago
@MECCNUTTY With the proper tensioning and if made heavy and large enough and with the right materials, there should be no slippage. After all a belt drive is just another kind of friction drive and belt drive has many applications. The secret in my case, of course, would be the size of the contact area. With three driven disks, made wide enough, it might work.
gregryf 1 year ago
@MECCNUTTY Thanks for your help.
gregryf 1 year ago
@gregryf I found this picture on variomatic, looks quite interesting. The URL won't paste here so go to google and search on Meccano variomatic. It is the nzmeccano link.
MECCNUTTY 1 year ago
@MECCNUTTY Yes, I've seen that one. It's probably beyond my ability to fabricate. I suppose the best thing would be to just go ahead and buy a drive system for a snowmobile. Thanks.
gregryf 1 year ago