Continuously variable transmission

Patent metadata

Field	Value
Publication number	US-8956262-B2
Application number	US-201113574083-A
Country	US
Kind code	B2
Filing date	Sep 22, 2011
Priority date	Sep 22, 2011
Publication date	Feb 17, 2015
Grant date	Feb 17, 2015

Abstract

A continuously variable transmission includes plural planetary balls, a carrier, a sun roller, an input shaft, an output shaft, and thrust bearings sandwiched between respective holding surfaces of the input shaft and the output shaft, wherein the holding surface at a time of rest is formed such that a space between the holding surface and a race on one side of the thrust bearing becomes wider on an outside in a radial direction than on an inside in the radial direction, and the holding surface at the time of rest is formed such that a space between the holding surface and a race on the other side of the thrust bearing becomes wider on the outside in the radial direction than on the inside in the radial direction.

First claim

The invention claimed is:

1. A continuously variable transmission comprising:
a transmission shaft disposed at a center of rotation;
a first rotating element and a second rotating element disposed on the transmission shaft in confrontation with each other and are capable of relatively rotating with each other, the first rotating element and the second rotating element having a common first rotation central axis;
a plurality of rolling members having a second rotation central axis in parallel with the first rotation central axis, and are sandwiched between the first rotating element and the second rotating element, the plurality of rolling members being disposed radially about the first rotation central axis;
support shafts projecting from both ends of the plurality of the rolling members and extending along the second rotation central axis;
a holding member tiltably holding the plurality of rolling members with a plurality of projecting sections of the respective support shafts;
a third rotating element having at least one of the plurality of rolling members disposed on an outer circumferential surface, the third rotating element being capable of relatively rotating with respect to the transmission shaft as well as the first and second rotating elements;
a speed change device configured to change a transmission ratio by changing a rotation ratio between the first rotating element and the second rotating element, the rotation ratio being changed by a tilt operation of the respective rolling members;
an input shaft of torque being coupled with the first rotating element, and having a disk section rotating about the first rotation central axis, the input shaft being subjected to a reaction force of a pressure force transmitted from the first rotating element to the respective plurality of rolling members;
an output shaft of torque being coupled with the second rotating element, and having a disk section rotating about the first rotation central axis and arranged opposite to the disk section of the input shaft, the output shaft being subjected to a reaction force of a pressure force transmitted from the second rotating element to the respective plurality of rolling members;
a bearing sandwiched between a holding surface in the disk section of the input shaft and a holding surface in the disk section of the output shaft;
a first elastic member disposed on an input shaft side of the bearing in the radial direction between the holding surface of the input shaft and a race on one side of the bearing, the first elastic member applying a load to an outside portion of the race on one side of the bearing at the time of rest; and
a second elastic member disposed on an output shaft side of the bearing in the radial direction between the holding surface of the output shaft and a race on the other side of the bearing, the second elastic member applying a load to an outside portion of the race on the other side of the bearing at the time of rest, wherein
the holding surface of the input shaft at a time of rest is formed such that a space between the holding surface and the race on one side of the bearing becomes wider on an outside in the radial direction than on an inside in the radial direction, and
the holding surface of the output shaft at the time of rest is formed such that a space between the holding surface and the race on the other side of the bearing becomes wider on the outside in the radial direction than on the inside in the radial direction.

Assignees

• Tomomatsu Daisuke
• Murakami Akira
• Ogawa Hiroyuki
• Aratsu Yuki
• Toyota Motor Co Ltd

Inventors

• Tomomatsu Daisuke
• Murakami Akira
• Ogawa Hiroyuki
• Aratsu Yuki

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

• F16H15/40 Primary

  in which two members co-operative by means of balls, or rollers of uniform effective diameter, not mounted on shafts · CPC title