Friction gear transmission systems or components – Friction gear includes idler engaging facing concave surfaces – Toroidal
Reexamination Certificate
1999-08-10
2001-01-16
Wright, Dirk (Department: 3681)
Friction gear transmission systems or components
Friction gear includes idler engaging facing concave surfaces
Toroidal
Reexamination Certificate
active
06174259
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a trunnion of a toroidal continuously variable transmission for a vehicle and a manufacturing process for the trunnion.
BACKGROUND OF THE INVENTION
Tokkai Hei 5-39831 published in 1993 and Tokkai Hei 8-21504 published in 1996 by the Japanese Patent Office discloses a toroidal continuously variable transmission for a vehicle wherein the ratio of the rotation speed of an input disk relative to the rotation speed of an output disk, i.e., a speed ratio, is continuously varied by varying the gyration angle of a pair of power rollers gripped between the input disk and output disk.
The power rollers are respectively supported by trunnions, and when these trunnions are displaced by hydraulic actuators, the gyration angles of the power rollers change according to the displacement of the trunnions.
SUMMARY OF THE INVENTION
The trunnion and the rod of the actuator are joined by pressing a pin into pinholes respectively formed in the trunnion and rod.
The pinhole in the trunnion is formed by drilling, but to form the pinhole with precision, the surface in which the pin hole is formed must be flattened before drilling
It is therefore an object of this invention to allow the pinhole to be precisely formed without machining the surface in which the pinhole is formed.
In order to achieve the above object, this invention provides a trunnion of a toroidal continuously variable transmission, comprising a support having a hole therethrough with an axis, a first shaft part on the top of the support that has an axis perpendicular to the axis of the hole, and a second shaft part on the bottom of the support that is coaxial with the first shaft part. The support has a pinhole adapted for insertion of a pin, an axis of the pinhole being perpendicular to the axis of the first shaft part and being approximately perpendicular to the axis of the hole of the support, and a surface of the support in which the pinhole is pierced is formed as a inclined plane inclining with respect to the axis of the hole.
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.
REFERENCES:
patent: 5820512 (1998-10-01), Nakano
patent: 5830103 (1998-11-01), Itoh et al.
patent: 197 06 287 (1997-11-01), None
patent: 5-39831 (1993-02-01), None
patent: 6-117515 (1994-04-01), None
patent: 6-280956 (1994-10-01), None
patent: 8-21504 (1996-01-01), None
Patent Abstracts of Japan, vol. 017, No. 123 (M-1380), Mar. 15, 1993 & JP 04 307152 (Nissan Motor Co. Ltd).
Foley & Lardner
Nissan Motor Co,. Ltd.
Wright Dirk
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