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US 6,475,111 B2Granted
Toroidal continuously variable transmission
AssigneeNissan Motor Co., Ltd.
InventorsJun Sugihara, Toshikazu Oshidari, Tsutomu Yamazaki, Haruhito Mori
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AssigneeNissan Motor Co., Ltd.
InventorsJun Sugihara, Toshikazu Oshidari, Tsutomu Yamazaki, Haruhito Mori
Estimating the term…
A power roller (18c) comprises a power roller inner wheel (93) in frictional contact with a input/output disks (18a, 18b), a power roller outer wheel (94) provided in a trunnion (17a), a ball bearing (92) interposed between the power roller inner wheel (93) and the power roller outer wheel (94), and an inner wheel supporting shaft (95) which supports the power roller inner wheel (93) such that it is free to rotate, the shaft having a shaft base part (95b) supported in the trunnion (17a), and arranged so that the radial support rigidity is set high in a gyration axis direction and set low in the direction perpendicular to the trunnion gyration axis (19a) and the power roller rotation axis (15d). When one of the disks is pressed and displaced in the direction of the other disk by the press member, the power roller inner wheel (93) displaces with the ball bearing (92) by the displacement of the one of the disks Therefore, as the radial support rigidity of the inner wheel supporting shaft (95) is different depending on the support direction, a slide function of the power roller (18c) can be provided by a simple structure having a small number of component parts which does not have a slide mechanism.
A toroidal continuously variable transmission comprising:
Dependencies are inferred from the claim text.
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Guidance of lubricant: within rotary parts, e.g. axial channels or radial openings in shafts
With concave friction surface, e.g. a hollow toroid surface: with two members B having hollow toroid surfaces opposite to each other, the member…
Friction gearings: of the toroid type
Gearing
Term ended 6 Mar 2021 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a toroidal continuously variable transmission.
Tokkai Hei 7-198014 published by the Japanese Patent Office in 1995 and Tokkai Hei 11-159590 published by the Japanese Patent Office in 1999, disclose a toroidal continuously variable transmission. Tokkai Hei 11-159590 describes a power roller supporting mechanism which can pivot. On the other hand, Tokkai Hei 7-198014 describes a power roller supporting mechanism which does not use an eccentric shaft.
However, there was the following problem in the prior art power roller supporting mechanism.
FIG. 1 is an overall system diagram showing a toroidal continuously variable transmission according to this invention.
FIG. 2 is a speed ratio control system diagram showing the toroidal continuously variable transmission according to this invention.
FIG. 3 is showing the power roller supporting structure in a embodiment according to this invention.
FIG. 1 is an overall view showing a toroidal continuously variable transmission according to a first embodiment. 10 shows the toroidal continuously variable transmission, and a rotation drive force is input from an engine, not shown, via a torque converter 12. The torque converter 12 comprises a pump impeller 12a, turbine runner 12b, stator 12c, lock-up clutch 12d, apply side oil chamber 12e and release side oil chamber 12f, and an impeller shaft 14 passes through its center.
The impeller shaft 14 is connected to a forward/reverse change-over mechanism 36. The forward/reverse change-over mechanism 36 comprises a planetary gear set 42, forward clutch 44 and reverse clutch 46. The planetary gear set 42 comprises a pinion carrier 42a supporting a double pinion, and a ring gear 42b and sun gear 42c which respectively mesh with the double pinion.
The pinion carrier 42a of the planetary gear set 42 is connected to a torque transmission shaft 16. A first continuously variable transmission 18 and second continuously variable transmission 20 are arranged downstream in tandem fashion in a transmission case 22 on the torque transmission shaft 16. A control valve body is disposed in a base shown by the symbol 64.