CONTINUOUSLY VARIABLE TRANSMISSION

• US 20150345599A1
• Filed: 04/30/2015
• Published: 12/03/2015
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ogawa, Hiroyuki
• Granted Patent: US 9,581,225 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F16H 15/28 with external friction surface
• CPC Class Codes: F16H 15/52 in which a member of uniform effective diameter mounted on a shaft may co-operate with different parts of another member

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.

Claims

1. A continuously variable transmission comprising:

first to third power transmission components which have a first rotation axis commonly set for each other and are relatively rotatable in a circumferential direction with respect to the first rotation axis;

a rolling component which has a second rotation axis, is radially disposed at a plurality of positions about the first rotation axis on an outer peripheral surface of the third power transmission component, and is sandwiched between the first and second power transmission components disposed to face each other;

a support shaft for the rolling component which is concentric with the second rotation axis and of which both ends protrude from the rolling component;

a first guide member that includes a first guide portion for guiding a first protrusion portion of the support shaft inserted thereinto in a radial direction with respect to the first rotation axis and is not rotatable;

a gear shift member that includes a gear change portion, into which the second protrusion portion is inserted and of which a longitudinal direction is tilted with respect to the radial direction so that forces applied between the second protrusion portion and a side wall of the gear change portion match each other during normal rotation of the first and second power transmission components, and is rotatable in the circumferential direction;

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 in the radial direction and is rotatable in the circumferential direction by applying a force to a side wall of the second guide portion; and

a second actuator which prohibits rotation of the second guide member at a position where the first guide portion and the second guide portion 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 thereof during reverse rotation of the first and second power transmission components 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 and second power transmission components.

2. The continuously variable transmission according to claim 1,

wherein a difference between a width of the second guide portion perpendicular to the radial direction and a size of the second protrusion portion in the perpendicular direction is set to a size in which the second protrusion portion does not contact the side wall of the gear change portion in a direction of a force applied to the second protrusion portion in the circumferential direction in response to a moment causing a skew during the reverse rotation while the second protrusion portion contacts the side wall of the second guide portion by the force.

3. The continuously variable transmission according to claim 2,

wherein at a time the second guide portion of the second guide member is provided between each rolling component and the gear shift member in the axial direction, the difference between the width of the second guide portion perpendicular to the radial direction and the size of the second protrusion portion in the perpendicular direction is set to be smaller than a difference between a width of the gear change portion perpendicular to the radial direction and the size of the second protrusion portion in the perpendicular direction.

4. 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.

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 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.