Toroidal-type continuously variable transmission

• US 6,942,593 B2
• Filed: 01/14/2003
• Issued: 09/13/2005
• Est. Priority Date: 01/17/2002
• Status: Active Grant

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Tanaka, Masami, Nishii, Hiroki
• Primary Examiner(s): Joyce, William C.
• Application Number:
  US10/341,473
• Publication Number:
  US 20030132051A1
• Time in Patent Office: 973 Days
• Field of Search: 476/40, 476/41, 476/42, 476/46, 384/623
• US Class Current: 476/40
• CPC Class Codes: F16C 19/30 for axial load mainly
• CPC Class Codes: F16C 2361/65 Gear shifting, change speed gear, gear box
• CPC Class Codes: F16C 33/48 for multiple rows of rollers or needles
• CPC Class Codes: F16H 15/38 with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
• CPC Class Codes: F16H 61/6649 characterised by the means for controlling the torque transmitting capability of the gearing

Abstract

A toroidal-type continuously variable transmission has: an input shaft; an input side disk and an output side disk respectively disposed on the outer periphery of the input shaft, the input side disk including a first cam surface; and a loading cam device interposed between the input side and output side disks and comprising: a loading cam including a second cam surface and rotatable together with the input shaft; a plurality of rollers interposed rollably between the first cam surface and the second cam surface; and a retainer, the retainer including a retainer main body having a circular-shaped fitting hole, and inside-diameter side projecting portions disposed on a retainer main body for maintaining the attitude of the retainer main body, wherein inside diameters of portions of the fitting hole corresponding to the inside-diameter side projecting portions are larger than that of the remaining portions of the fitting hole.

Claims

1. A continuously variable transmission comprising:

an input shaft;

an input side disk and an output side disk respectively disposed on the outer periphery of the input shaft, the input side disk including, in the outer surface thereof, a first cam surface formed as an uneven surface extending in the circumferential direction of the input side disks and

a loading cam device interposed between the input side and output side disk and comprising;

a loading cam including, in one side surface thereof, a second cam surface formed as an uneven surface extending in the circumferential direction thereof and rotatable together with the input shaft;

a plurality of rollers interposed rollably between the first cam surface of the input side disk and the second cam surface of the loading cam; and

a retainer for supporting the rollers, the retainer including a retainer main body having a circular-shaped fitting hole to be fitted with the loading cam, and inside-diameter side projecting portions disposed on a retainer main body for maintaining the attitude of the retainer main body,

wherein inside diameters of portions of the fitting hole corresponding to the inside-diameter side projecting portions are larger than that of the remaining portions of the fitting hole.

2. The continuously variable transmission as set forth in claim 1, wherein the loading cam includes a boss portion, the fitting hole of the retainer being fitted with the boss portion of the loading cam.