Continuously variable transmission

Patent metadata

Field	Value
Publication number	US-9581225-B2
Application number	US-201514700828-A
Country	US
Kind code	B2
Filing date	Apr 30, 2015
Priority date	May 30, 2014
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A continuously variable transmission includes: first to third power transmission components; a rolling component; a support shaft for the rolling component; a first guide member that includes a first guide portion for guiding a first protrusion portion of the inserted support shaft; a gear shift member that includes a gear change portion; a first actuator which tilts each rolling component by moving each second protrusion portion along the gear change portion with rotation of the gear shift member at a time an input-output gear ratio is changed; a second guide member that includes a second guide portion for guiding a second protrusion portion of the inserted support shaft; and a second actuator which prohibits rotation of the second guide member during reverse rotation of the first and second power transmission components and allows rotation of the second guide member during normal rotation of the first and second power transmission components.

First claim

What is claimed is:

1. A continuously variable transmission comprising:
a first power transmission component relatively rotatable around a first rotation axis;
a second power transmission component relatively rotatable around the first rotation axis;
a third power transmission component relatively rotatable around the first rotation axis;
a plurality of rolling components each of which are relatively rotatable around a respective second rotation axis, the plurality of rolling components are radially disposed at a plurality of positions about the first rotation axis on an outer peripheral surface of the third power transmission component, and the plurality of rolling components are sandwiched between the first power transmission component and the second power transmission component disposed to face each other;
a support shaft for each of the plurality of rolling components which is concentric with the respective second rotation axis provided for each of the plurality of rolling components, each support shaft having a first protrusion portion and a second protrusion portion, the first protrusion portion of each support shaft and the second protrusion portion of each support shaft protrude from each of the plurality of rolling components;
a first guide member that includes a plurality of first guide portions, the first protrusion portion of each support shaft is inserted into a respective one of the plurality of first guide portions, the plurality of first guide portions guide the first protrusion portion of each support shaft in a radial direction with respect to the first rotation axis, the first guide member is not rotatable;
a gear shift member that includes a plurality of gear change portions, the second protrusion portion of each support shaft is inserted into a respective one of the plurality of gear change portions, a longitudinal direction of each of the plurality of gear change portions is tilted with respect to the radial direction so that forces applied between the second protrusion portion of each support shaft and a side wall of the respective one of the plurality of gear change portions match each other during normal rotation of the first power transmission component and the second power transmission component, the gear shift member is rotatable about the first rotation axis;
a first actuator which tilts each of the plurality of rolling components by moving the second protrusion portion of each support shaft along the respective one of the plurality of gear change portions with rotation of the gear shift member at a time an input-output gear ratio is changed;
a second guide member that includes a plurality of second guide portions, the second protrusion portion of each support shaft is inserted into a respective one of the plurality of second guide portions, the plurality of second guide portions guide the second protrusion portion of each support shaft in the radial direction, the second guide member is rotatable about the first rotation axis by applying a first force to a side wall of each of the plurality of second guide portions; and
a second actuator which prohibits rotation of the second guide member at a position where the plurality of first guide portions and the plurality of second guide portions face each other in an axial direction of the first rotation axis by engaging a second engagement portion of the second guide member with a first engagement portion of the second guide member during reverse rotation of the first power transmission component and the second power transmission component and allows rotation of the second guide member by operating the second engagement portion so that an engagement state with respect to the first engagement portion is released during the normal rotation of the first power transmission component and the second power transmission component.

2. The continuously variable transmission according to claim 1 ,
wherein a difference between a width of the respective one of the plurality of second guide portions in a perpendicular direction that is perpendicular to the radial direction and the axial direction, and a size of the second protrusion portion of each support shaft in the perpendicular direction is set to a size in which the second protrusion portion of each support shaft does not contact the side wall of the respective one of the plurality of gear change portions in a direction of a second force applied to the second protrusion portion of each support shaft in response to a moment causing a skew of the respective second rotation axis with respect to the first rotation axis during the reverse rotation while the second protrusion portion of each support shaft contacts the side wall of the respective one of the plurality of second guide portions by the second force.

3. The continuously variable transmission according to claim 2 ,
wherein at a time in which each support shaft is in the axial direction, the difference between the width of the respective one of the plurality of second guide portions in the perpendicular direction and the size of the second protrusion portion of each support shaft in the perpendicular direction is set to be smaller than a difference between a width of the respective one of the plurality of gear change portions in the perpendicular direction and the size of the second protrusion portion of each support shaft in the perpendicular direction.

4. The continuously variable transmission according to claim 3 ,
wherein the first engagement portion is a hole portion and the second engagement portion is a pin member that is inserted into or extracted from the hole portion.

5. The continuously variable transmission according to claim 2 ,
wherein the first engagement portion is a hole portion and the second engagement portion is a pin member that is inserted into or extracted from the hole portion.

6. The continuously variable transmission according to claim 1 ,
wherein the first engagement portion is a hole portion and the second engagement portion is a pin member that is inserted into or extracted from the hole portion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ogawa Hiroyuki

Classifications

• F16H15/52 Primary

  in which a member of uniform effective diameter mounted on a shaft may co-operate with different parts of another member · CPC title

• F16H15/28 Primary

  with external friction surface · CPC title