TOROIDAL CONTINUOUSLY VARIABLE TRANSMISSION

• US 20130053211A1
• Filed: 02/10/2012
• Published: 02/28/2013
• Est. Priority Date: 02/17/2011
• Status: Abandoned Application

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Fukuda, Kota, Kishida, Hirotaka
• Application Number:
  US13/581,763
• Publication Number:
  US 20130053211A1
• Time in Patent Office: Days
• US Class Current: 476/10
• 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 2015/383 with two or more sets of toroid gearings arranged in parallel

Abstract

The present invention provides a toroidal continuously variable transmission capable of setting loading pressure at low pressure while avoiding a problem of excessive pressing with centrifugal hydraulic pressure.

The toroidal continuously variable transmission includes an input disc 2 to be rotated integrally with an input shaft 1 as being coupled with the input shaft which receives rotational force, and an output disc 3 which receives rotational force of the input disc 2 at a predetermined transmission ratio via a power roller 11 arranged at a space against the input disc 2 and is operated at constant output rotational speed. Further, a hydraulic pressing device 12A which presses the output disc 3 in the axial direction is arranged at a back surface of the output disc 3.

Claims

1. A toroidal continuously variable transmission of which output rotational speed is approximately constant, comprising:

an input disc to be rotated integrally with an input shaft as being coupled with the input shaft which receives rotational force;

an output disc which receives rotational force of the input disc at a predetermined transmission ratio via a power roller arranged at a space against the input disc; and

a hydraulic pressing device which presses the output disc in the axial direction as being arranged at a back surface of the output disc.

2. The toroidal continuously variable transmission according to claim 1, further comprising a spring which exerts pressing force to an abutment portion between toroidal surfaces of the respective discs and a circumferential surface of the power roller,

wherein axial force being a sum of pressing force due to centrifugal hydraulic pressure which is generated by output rotation and spring force due to the spring is to be required axial force.

3. The toroidal continuously variable transmission according to claim 1 or 2,

wherein the transmission is for a generator.