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  1. greycloud

    Interesting CVT transmission patent

    any idea where I can read more about this transmission?
  2. greycloud

    Interesting CVT transmission patent

    though it should be hydraulic in overdrive
  3. greycloud

    Interesting CVT transmission patent

    if you are referring to different gears being engaged by hydraulic clutch then that is the norm in entire automotive industry as well as construction equipment
  4. greycloud

    Interesting CVT transmission patent

    by fluid leaks I believe you mean leaks between cylinder and plungers which should be low if I'm not mistaken. flow restrictions and viscous pumping losses well be present in an auto tranmission as well cause u still have a trans pump running all time with passage ways to deliver the oil...
  5. greycloud

    Interesting CVT transmission patent

    well, pump is directly connected to motor so that changes everything. other variations included in the patent replace the swashplate with an accentric cam or a crank arm.
  6. greycloud

    Interesting CVT transmission patent

    I read several reviews about this bike and indeed they report that its very reliable; however like u said their issue was the steep price indeed and that many felt like it was a scooter due to absence of a clutch. however, I believe any CVT would be good on effiecency side especially if compared...
  7. greycloud

    Interesting CVT transmission patent

    why do you think it would be inefficient?
  8. greycloud

    Interesting CVT transmission patent

    that indeed looks very similar indeed! any idea what was the problem with such transmission?
  9. greycloud

    Interesting CVT transmission patent

    Hi I was online reading about CVT types and stumbled upon attached Patent application for a unique CVT idea from 1983! it looks feasible but I don't seem to find any actual application for it. This is surprising as it seems to solve common problem with current CVTs especially regarding high...
  10. greycloud

    Interesting CVT patent

    Hi I was online reading about CVT types and stumbled upon attached Patent application for a unique CVT idea from 1983! it looks feasible but I don't seem to find any actual application for it. This is surprising as it seems to solve common problem with current CVTs especially regarding high...
  11. greycloud

    life expectency of hydraulic cylinder and piston seals

    I'm not talking about any specific case right now but about my experience in general. all the factors you mentioned above show one thing, that transmissions can last longer because it's a more controlled environment where temp, pressure, actuation length can be more uniformly which allows you...
  12. greycloud

    life expectency of hydraulic cylinder and piston seals

    I mean like it starts to leak within two year period.I'm talking from experience with construction equipment.like excavators, wheel loaders, etc. Transmisdions on other hand may live for 10+ years without issues
  13. greycloud

    life expectency of hydraulic cylinder and piston seals

    I get what Brian is saying, but in many cases you open transmission after a 10 year use to find piston seals are in perfect condition! I was wondering if it has to be about transmission enviroment being more controlled than in the case of hydraulic systems and cylinders.
  14. greycloud

    life expectency of hydraulic cylinder and piston seals

    I'm just discussing what you pointed out as this is a discussion, I hope ou don't get upset if I don't agree with some of your points. a transmission clutch can be actuated hundreds of thousands of times so its total travel will be in the range of kilometers as well. You may be right about...
  15. greycloud

    life expectency of hydraulic cylinder and piston seals

    travel distance of transmission clutch pistons can be between 5 to 10 mms per stroke; so its travel during its life is far more than a dozen millimeters for sure temperature is sure a contributing factor but why are hydraulics limited to Buna-n seals? why can't they use EPDM or other seal typess?
  16. greycloud

    life expectency of hydraulic cylinder and piston seals

    Hi I notice that seals on hydraulic cylinder fail quite often which gives you the impression they can't live for long; however when you look at piston seals used in tranmissions or brakes you find that they can live for 30 years or more without servicing! why is that the case? it really has...
  17. greycloud

    little hydraulic cylinders

    I did alot of research and it's clear I can't find a hydraulic cylinder with a breakaway force of 5 newtons. I'm going for pneumatic cylinders which easily have the rated breakaway load I need. I also ordered some bellows since they don't have seals causing friction as well. Thanks alot for...
  18. greycloud

    little hydraulic cylinders

    well my required stroke is 30 mm only, I'm indeed looking for bellows as well.
  19. greycloud

    little hydraulic cylinders

    You can find pneumatic cylinders operating at even 1.6 newtons, they have what they call low friction cylinders; but thing is I preferred hydraulic cylinders since liquid is not compressible. I want this cylinder to be actually moved by low force, much like what you do with a syringe but with...
  20. greycloud

    little hydraulic cylinders

    Hi I was looking to get small hydraulic cylinders that can be actuated by 5 newtons of force or similar, anyone know where I can find such cylinders? Thanks

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