Infinitely variable transmissions, continuously variable transmissions, methods, assemblies, subassemblies, and components therefor

摘要

Inventive embodiments are directed to components, subassemblies, systems, and/or methods for infinitely variable transmissions (IVT) having a variator provided with a plurality of tilting spherical planets. In one embodiment, a variator is provided with multiple planet arrays. In another embodiment, a hydraulic system is configured to control the transmission ratio of the IVT. Various inventive idler assemblies and planet-pivot arm assemblies can be used to facilitate adjusting the transmission speed ratio of an IVT. Embodiments of a transmission housing and bell housing are adapted to house components of an IVT and, in some embodiments, to cooperate with other components of the IVT to support operation and/or functionality of the IVT. Various related devices include embodiments of, for example, a control feedback mechanism, axial force generation and management mechanisms, a control valve integral with an input shaft, and a rotatable carrier configured to support planet-pivot arm assemblies.

主权项

1. A method of changing the ratio of a variator of a continuously variable or infinitely variable transmission (CVT/IVT), the variator comprising a plurality of spherical rollers arranged about a central axis and interposed between a first traction ring and a second traction ring, each spherical roller being rotatable about an axle, the method comprising the steps of:
determining a desired speed ratio for the transmission; sending a control signal to a hydraulic control valve operably coupled to a plurality of hydraulic pistons, wherein the plurality of planet axles of the variator are operably coupled to at least one of the plurality of hydraulic pistons; and supplying a hydraulic pressure from the hydraulic control valve to at least one of the plurality of hydraulic pistons based on the control signal, wherein one or more of the hydraulic pressure and the rate at which hydraulic pressure is applied actuates a change in a tilt angle of at least one of the planet axles to the desired speed ratio.