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US 6,712,724 B2Granted
Belt-type continuously variable transmission
AssigneeJATCO Ltd
InventorYoshiaki Katou
Life of this patent
Estimating the term…
Abstract
A belt-type CVT is comprised of a driving pulley and a driven pulley each of which has having a transmission piston chamber and a clamp piston chamber. An effective cross sectional area of the driving-side clamp piston chamber is equal to an effective cross sectional area of the driven-side clamp piston chamber. The driving-side clamp piston chamber is fluidly communicated with the driven-side clamp piston chamber through a common passage.
Claims15
A belt-type continuously variable transmission comprising:
- a driving pulley having a driving-side transmission piston chamber and a driving-side clamp piston chamber;
- a driven pulley having a driven-side transmission piston chamber and a driven-side clamp piston chamber;
- an endless belt wound around the driving pulley and the driven pulley so as to transmit a driving force from the driving pulley to the driven pulley;
- a hydraulic circuit controlling effective pulley diameters of the driving pulley and the driven pulley relative to the belt according to vehicle condition indicative information to continuously vary a transmission ratio of the belt-type continuously variable transmission;
- wherein at least one of first and second relationships is satisfied, the first relationship being that an effective cross sectional area of the driving-side transmission piston chamber is equal to an effective cross sectional area of the driven-side transmission piston chamber, and the second relationship being that an effective cross sectional area of the driving-side clamp piston chamber is equal to an effective cross sectional area of the driven-side clamp piston chamber;
- wherein one of third and fourth relationships is satisfied, the third relationship being that a common passage of the hydraulic circuit fluidly communicates the driving-side transmission piston chamber and the driven-side transmission piston chamber, the fourth relationship being that the common passage fluidly communicates the driving-side clamp piston chamber and the driven-side clamp piston chamber.
3 more elements
A belt-type continuously variable transmission comprising:
- a driving pulley having a driving-side transmission piston chamber and a driving-side clamp piston chamber;
- a driven pulley having a driven-side transmission piston chamber and a driven-side clamp piston chamber, an effective cross sectional area of the driving-side transmission piston chamber being substantially equal to an effective cross sectional area of the driven-side transmission piston chamber, an effective cross sectional area of the driving-side clamp piston chamber being substantially equal to an effective cross sectional area of the driven-side clamp piston chamber;
- a belt wound around the driving pulley and the driven pulley;
- a hydraulic circuit controlling effective pulley diameters of the driving pulley and the driven pulley relative to the belt according to vehicle condition indicative information to continuously vary a transmission ratio of the belt-type continuously variable transmission, a common passage of the hydraulic circuit establishing one of a first fluid communication between the driving-side transmission piston chamber and the driven-side transmission piston chamber and a second fluid communication between the driving-side clamp piston chamber and the driven-side clamp piston chamber.
1 more element
Dependencies are inferred from the claim text.