Friction gear transmission systems or components – Friction gear includes idler engaging facing concave surfaces – Toroidal
Patent
1999-06-11
2000-11-28
Bonck, Rodney H.
Friction gear transmission systems or components
Friction gear includes idler engaging facing concave surfaces
Toroidal
476 40, F16H 1538
Patent
active
061528501
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a toroidal continuous variable transmission consisting of input and output disks having toroidal surfaces drivingly connected by power rollers that are adjustable in tilt output disk in a continuous variable rotary speed changing manner.
BACKGROUND ART
Most toroidal continuous variable transmission have a toroidal rotary speed changer that is composed of an input disk driven by an input shaft, an output disk arranged confronting with the input disk and connected to an output shaft, and adjustable power rollers arranged in frictional rolling-contact with both the disks. In the toroidal continuous variable transmission, varying the tilt of the power roller causes the continuous variable variation in the speed of rotation that is to be transmitted from the input disk to the output disk.
An example of toroidal continuous variable transmissions conventionally installed on vehicle is diagrammatically shown in FIG. 6. A toroidal continuous variable transmission 1 installed on the vehicle is comprised of an input shaft 21 for taking off the power of an engine E, an input disk 3 supported for rotation relatively to the input shaft 21, an output disk 23 connected to an output shaft 24 and arranged in opposition to the input disk 3 while for rotation relatively to the input disk 3, a pair of power rollers 2, 2 adjustable in tilt and arranged between the confronting input disk 3 and the output disk 23 so as to transmit the applied torque from the input disk 3 to the output disk 23, and thrust means 22 such as a loading cam provided between a flange 25 attached to the input shaft 21 and the input disk 3 so as to control the magnitude of the contact pressure of the input disk 3 against the output disk 23 dependently on the magnitude of the applied torque, whereby adjusting the tilt of the power rollers 2, 2 may result in the continuous variable speed changing of rotation that is transmitted from the input shaft 3 to the output shaft 32. If the power rollers 2, 2 were adjusted at a tilt angle .theta. shown in the drawings, the power rollers 2, 2 would be in friction contact with the input disk 3 at a radius r.sub.1 while in friction contact with the output disk 23 at a radius r.sub.2 and, therefore, the output speed would be r.sub.1 /r.sub.2 the input speed. In the meantime the members at 4 are trunnions for supporting the adjustable power rollers 2, 2 and will be described in detail later. The tilt angles of the power rollers 2, 2 in the toroidal continuous variable transmission 1 are adjusted by means of a controller unit that will be described hereinafter.
Japanese Patent Laid-Open No. 151219/1995 discloses the toroidal continuous variable transmission of the type described just above and the speed-change type described just above and the speed-change control system therefor. FIG. 7 shows an exemplary prior art of the toroidal continuous variable transmission and the speed-change control system therefor. As apparent from the illustration, a pair of adjustable power rollers 2, 2 is arranged confronting with each other between the input and output disks 3, 23. The adjustable power rollers 2, 2 are each supported for pivoting or rocking motion in response to deflections of the space between the confronting input and output disks 3, 23 along the axial direction of the disks, while for rotation in frictional rolling-contact with the input and output disks 3, 23. This support mechanism for the power rollers 2, 2 is a kind of pivot assembly composed of a supporting member, what is called trunnion 4, and a supporting shaft 5 serving as a pivot shaft for the trunnion 4. The trunnions 4, 4 are each mounted to a transmission case (not shown) for rotation as well as axial movement. Moreover the trunnions 4, 4 each have a pivotal shaft, or pivotal shaft 6, and are movable along the axial direction of the pivotal shaft 6 while capable of pivoting movement on the pivotal shaft 6. Connected to the pivotal shaft 6 of the trunnion 4 is a piston 7 that is fitted for sliding movement i
REFERENCES:
patent: 4694704 (1987-09-01), Kraus
patent: 5823911 (1998-10-01), Hibi
patent: 5830103 (1998-11-01), Itoh et al.
Inoue Eiji
Yamazaki Atsushi
Bonck Rodney H.
Isuzu Motors Limited
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