Belt-driven continuously variable transmission

Patent metadata

Field	Value
Publication number	US-9182017-B2
Application number	US-201114002555-A
Country	US
Kind code	B2
Filing date	Mar 31, 2011
Priority date	Mar 31, 2011
Publication date	Nov 10, 2015
Grant date	Nov 10, 2015

Abstract

A belt-driven continuously variable transmission adapted to prevent a tilting motion of a sheave under high temperature.
The belt-driven continuously variable transmission is comprised of a pair of pulleys individually comprised of a fixed sheave rotated integrally with a rotary shaft and a movable sheave fitted onto the rotary shaft while being allowed to reciprocate thereon, and a driving belt applied to the pulleys to transmit power therebetween. a stopper member is disposed on an outer circumferential side and in a side where the driving belt is not contacted with the movable sheave so as to prevent the movable sheave from being tilted to widen a width between the fixed sheave and the movable sheave holding the driving belt by a load from the driving belt.

First claim

The invention claimed is:

1. A belt-driven continuously variable transmission, comprising:
a pair of pulleys, that is individually comprised of a fixed sheave rotated integrally with a rotary shaft, and a movable sheave fitted onto the rotary shaft while being allowed to reciprocate in an axial direction of the rotary shaft;
a driving belt applied to the pulleys to transmit power therebetween; and
a stopper member that is disposed on an outer circumferential side and in a side where the driving belt is not contacted with the movable sheave, so as to prevent the movable sheave from being tilted to widen a width between the fixed sheave and the movable sheave holding the driving belt by a load from the driving belt;
wherein the stopper member is adapted to restrict an axial position of the movable sheave when an effective diameter position of the driving belt is displaced to an outermost position.

2. The belt-driven continuously variable transmission as claimed in claim 1 , further comprising:
a hydraulic actuator that is disposed on a back side of the movable sheave which is opposite to a side opposed to the fixed sheave to apply a thrust to the movable sheave in the axial direction;
wherein the movable sheave is comprised of a member that is moved in the axial direction along an inner face of the outer circumferential portion of the hydraulic actuator; and
wherein the stopper member is disposed on the inner face of the hydraulic actuator at a position to be brought into contact with said member of the movable sheave to counteract a moment of force derived from a reaction force applied from the driving belt to tilt the movable sheave situated closest to the fixed sheave.

Assignees

• Yoshida Michio
• Hattori Yuji
• Yanagida Tomoaki
• Harima Kazunori
• Toyota Motor Co Ltd

Inventors

• Yoshida Michio
• Hattori Yuji
• Yanagida Tomoaki
• Harima Kazunori

Classifications

• F16H9/125

  characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis · CPC title

• F16H55/56

  of which the bearing parts are relatively axially adjustable · CPC title

• F16H9/18 Primary

  only one flange of each pulley being adjustable · CPC title