Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1998-11-30
2000-10-17
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477906, F16H 6112
Patent
active
061323330
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a toroidal continuously variable transmission that has power rollers tiltably arranged between an input disk and an output disk, both having a toroidal surface, and which continuously changes the rotation speed of the input disk and transfers the speed-changed rotation to the output disk.
BACKGROUND ART
A toroidal continuously variable transmission has been known which has a toroidal speed change unit that comprises an input disk, an output disk arranged opposite the input disk, and power rollers in frictional contact wit these disks. This toroidal continuously variable transmission continuously changes the rotation speed of the input disk by changing a tilt angle of the power rollers while transmitting the rotation of the input disk to the output disk.
Among the toroidal continuously variable transmissions there are those having a plurality of toroidal speed change units mounted on the same shaft. A type of toroidal continuously variable transmission particularly with two parallelly arranged toroidal speed change units is known as a double cavity type toroidal continuously variable transmission. FIGS. 6 and 7 show one example of the conventional double cavity type toroidal continuously variable transmission. FIG. 6 is a schematic diagram of the conventional double cavity type toroidal continuously variable transmission and FIG. 7 is a cross section showing a transmission ratio control mechanism in the double cavity type toroidal continuously variable transmission of FIG. 6 that includes the toroidal speed change units and a transmission ratio control valve. FIG. 8 is a flow chart showing the procedure for determining a duty of a solenoid valve in the transmission ratio control mechanism of FIG. 7.
In the double cavity type toroidal continuously variable transmission shown in FIG. 6, two toroidal speed change units 1, 2 are mounted side by side on a main shaft 3. The toroidal speed change unit 1 comprises an input disk 4, an output disk 5 disposed opposite the input disk 4, and power rollers 6 in frictional engagement with toroidal surfaces of the disks 4, 5. The toroidal speed change unit 2, like the toroidal speed change unit 1, comprises an input disk 7, an output disk 8 disposed opposite the input disk 7, and power rollers 9 in frictional engagement with toroidal surfaces of the disks 7, 8. The toroidal speed change units 1, 2 each have two sets of power rollers 6, 9. The power rollers 6, 9 each can be rotated on their own rotation axis 10 and tilted about a tilt axis 11 (perpendicular to the sheet of the drawing) crossing the rotation axis 10 at right angles.
In the toroidal speed change units 1, 2, the input disks 4, 7 are displaceable in the axial direction of the main shaft 3 and rotatable together with the main shaft 3. The driving force of the engine is supplied through a torque converter 12 to an input shaft 13 laid on the same axis as the main shaft 3. At the front end of the input shaft 13 there is provided a loading cam 14 with a cam roller 15. The rotation of the loading cam 14 causes the input disk 4 and, through the main shaft 3, the input disk 7 to rotate. Thus, the main shaft 3 functions as an input shaft for the input disks 4, 7. The cam action of the loading cam 14 generates a thrust force (in the axial direction of the main shaft 3) pressing the input disks 4, 7 against the power rollers 6, 9 according to the magnitude of the input torque. The thrust force holds the power rollers 6, 9 between the input disks 4, 7 and the output disks 5, 8 according to the magnitude of the torque being transmitted. The rotation of the input disks 4, 7 is transmitted to the output disks 5, 8 through the power rollers 6, 9 based on the oil shearing force.
In each of the toroidal speed change units 1, 2, the power rollers 6, 9 are tiltable about the tilt axes 11, and the rotation of the input disks 4, 7 while being transmitted to the output disks 5, 8 is continuously changed in speed according to the tilt angle of the power rollers 6, 9. The power rolle
REFERENCES:
patent: 5575732 (1996-11-01), Inoue
patent: 5681236 (1997-10-01), Inoue
patent: 5711741 (1998-01-01), Inoue
patent: 5779591 (1998-07-01), Inoue
patent: 5842945 (1998-12-01), Inoue
Inoue Eiji
Yamazaki Atsushi
Isuzu Motors Limited
Ta Khoi Q.
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