CONTINUOUSLY VARIABLE TRANSMISSION
First Claim
1. A CVT transmission comprising:
- a shaft (1) journalled to a housing (4);
a first sheave (14) fixed to the shaft (1);
a second sheave (12) moveable parallel to an axis of rotation (1A) of the shaft;
the second sheave locked in rotating relation with the first sheave by a first sheave member (22) cooperatively engaged with a second sheave receiving member (12A), the second sheave receiving member disposed at a helical angle (HA) with respect to the axis of rotation;
a sprocket (6) journalled to the housing;
the sprocket threadably engaged (6B) with a movable member (26), a bearing (16) disposed between the movable member and the second sheave;
the movable member engaged (5A) with the housing whereby movement of the movable member is parallel with the axis of rotation;
an electric actuator (30) engaged with the sprocket; and
the second sheave is axially movable upon a rotation of the sprocket.
4 Assignments
0 Petitions
Accused Products
Abstract
A CVT transmission comprising a shaft journalled to a housing, a first sheave fixed to the shaft, a second sheave moveable parallel to an axis of rotation of the shaft, the second sheave locked in rotating relation with the first sheave by a first sheave member cooperatively engaged with a second sheave receiving member, the second sheave receiving member disposed at a helical angle (HA) with respect to the axis of rotation, a sprocket journalled to the housing, the sprocket threadably engaged with a movable member, a bearing disposed between the movable member and the second sheave, the movable member engaged with the housing whereby movement of the movable member is parallel with the axis of rotation, an electric actuator engaged with the sprocket, and the second sheave is axially movable upon a rotation of the sprocket.
22 Citations
16 Claims
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1. A CVT transmission comprising:
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a shaft (1) journalled to a housing (4); a first sheave (14) fixed to the shaft (1); a second sheave (12) moveable parallel to an axis of rotation (1A) of the shaft; the second sheave locked in rotating relation with the first sheave by a first sheave member (22) cooperatively engaged with a second sheave receiving member (12A), the second sheave receiving member disposed at a helical angle (HA) with respect to the axis of rotation; a sprocket (6) journalled to the housing; the sprocket threadably engaged (6B) with a movable member (26), a bearing (16) disposed between the movable member and the second sheave; the movable member engaged (5A) with the housing whereby movement of the movable member is parallel with the axis of rotation; an electric actuator (30) engaged with the sprocket; and the second sheave is axially movable upon a rotation of the sprocket. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A clutch system for a continuously variable transmission, the clutch system coupled to a shaft that is rotatable about a longitudinal axis, comprising:
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a stationary sheave coupled to the shaft; a movable sheave comprising a slot, and moveably coupled to the shaft, the movable sheave being movable with respect to said stationary sheave along the longitudinal axis; a positional motor coupled to the moveable sheave and configured to cause said moveable sheave to move closer or further from the stationary sheave; and the moveable sheave and the stationary sheave coupled via a slot, said slot is generally at a helical angle from said longitudinal axis. - View Dependent Claims (8, 9, 10, 11)
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12. A vehicle comprising a continuously variable transmission system, wherein the continuously variable transmission system comprises:
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a stationary sheave coupled to a shaft; a movable sheave journalled about the shaft, the movable sheave being movable closer to or further from the stationary sheave along a longitudinal axis of rotation; a motor coupled to the moveable sheave and configured to cause said moveable sheave closer or further from the stationary sheave; and the stationary sheave and the moveable sheave coupled with a pin and slot, wherein said slot is generally at a helical angle from said longitudinal axis of rotation and configured to reduce the longitudinal force needed to move said moveable sheave relative to said stationary sheave, with respect to a moveable sheave with a slot generally parallel to said longitudinal axis. - View Dependent Claims (13, 14, 15)
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16. A method of controlling a CVT transmission comprising:
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sending engine and transmission system signals to a microprocessor; calculating a speed ratio using the engine and transmission system signals; selecting a required speed ratio from a look up table; determining a transmission control motor speed and direction; and sending a signal to the transmission control motor to change the speed ratio to match the required speed ratio.
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Specification