Continuously variable transmissions and methods therefor
First Claim
1. A transmission comprising:
- a plurality of traction rollers;
a carrier assembly operably coupled to the traction rollers;
an input element configured to transfer torque to the traction rollers, the input element comprising;
a load cam having bidirectional load cam ramps, anda traction ring having bidirectional load cam ramps;
an output element configured to transfer torque from the traction rollers;
a shifter assembly configured to adjust an axis of rotation of the traction rollers;
a hydraulic system operably coupled to the shifter assembly; and
a lubrication system configured to provide lubricant to at least the traction rollers.
6 Assignments
0 Petitions
Accused Products
Abstract
Components, subassemblies, systems, and/or methods for continuously variable transmissions (CVT) having a variator provided with a plurality of tilting, traction planets and traction rings are described. In one embodiment, a variator is coupled to a rangebox to provide multiple operating modes. In another embodiment, a hydraulic system is configured to control the transmission ratio of the variator and the rangebox. Shift-cam-and-sun subassemblies can be used to facilitate shifting of the transmission ratio of a CVT. A transmission housing and bell housing can be adapted to house components of a CVT and, in some embodiments, to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Related devices include, for example, a pivot arm, a control feedback mechanism, axial force generation and management mechanisms, a control valve integral with an input shaft, a pivot pin hub, and a rotatable carrier configured to support planet-pivot arm assemblies.
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Citations
24 Claims
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1. A transmission comprising:
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a plurality of traction rollers; a carrier assembly operably coupled to the traction rollers; an input element configured to transfer torque to the traction rollers, the input element comprising; a load cam having bidirectional load cam ramps, and a traction ring having bidirectional load cam ramps; an output element configured to transfer torque from the traction rollers; a shifter assembly configured to adjust an axis of rotation of the traction rollers; a hydraulic system operably coupled to the shifter assembly; and a lubrication system configured to provide lubricant to at least the traction rollers. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A drive comprising:
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a torque converter; a main shaft coupled to the torque converter; an input load cam coupled to the main shaft; an input traction ring operationally coupled to the input load cam; a plurality of traction planets adapted to receive torque from the input traction ring; an output traction ring adapted to receive torque from the plurality of traction planets; an output load cam operationally coupled to the output traction ring; a planetary gearset coupled to the output load cam and to the main shaft; and a hydraulic system configured to provide lubricant and control pressure to at least the traction planets. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification