Shift mechanism for power transmission device

Patent metadata

Field	Value
Publication number	US-11536366-B2
Application number	US-202117234331-A
Country	US
Kind code	B2
Filing date	Apr 19, 2021
Priority date	Apr 27, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

A shift mechanism switches power transmission paths among a first transmission shaft, a second transmission shaft, and a third transmission shaft that are concentrically arranged on a rotational axis. The shift mechanism has a drive drum that is provided so as to be coaxial with the rotational axis and pivotable about the rotational axis, and a first driven drum and a second driven drum that are arranged on the rotational axis so as to be concentric with the drive drum and move along the rotational axis as the drive drum pivots. As the first driven drum moves, a first shift sleeve advances and retreats, and the first transmission shaft and the second transmission shaft are connected and disconnected. In addition, as the second driven drum moves, a second shift sleeve advances and retreats, and the second transmission shaft and the third transmission shaft are connected and disconnected.

First claim

The invention claimed is:

1. A clutch mechanism comprising:
a transmission shaft, and another transmission shaft that are concentrically arranged on a rotational axis;
a shift sleeve that advances and retreats along the rotational axis and connects and disconnects the transmission shaft and the other transmission shaft;
a drive drum that is provided so as to be coaxial with the rotational axis and pivotable about the rotational axis; and
a driven drum that is located on the rotational axis so as to be concentric with the drive drum and moves along the rotational axis as the drive drum pivots, thereby causing the shift sleeve to advance and retreat.

2. The clutch mechanism according to claim 1 , wherein
a cam groove is provided on a circumferential surface of the drive drum, and
the driven drum has a driven pin engaged with the cam groove, and when the driven pin is driven according to a profile of the cam groove as the drive drum pivots, the driven drum moves along the rotational axis.

3. The clutch mechanism according to claim 1 , wherein
the drive drum has a drive pin on its circumferential surface, and
the driven drum is provided with a cam groove engaged with the drive pin, and the driven drum moves along the rotational axis according to a profile of the cam groove as the drive pin pivots in accordance with pivoting of the drive drum.

4. The clutch mechanism according to claim 1 , wherein
the driven drum has a driven pin vertically provided on its circumferential surface, and
the drive drum is provided with
a cam surface that comes into contact with the side surface of the driven pin to restrict movement of the driven drum in the advancing direction, and
another cam surface that comes into contact with the side surface of the driven pin to restrict movement of the driven drum in the retreating direction,
when the driven pin is driven according to profiles of the cam surface and the other cam surface as the drive drum pivots, the driven drum moves along the rotational axis, and
the cam surface lacks a portion that restricts, when the driven drum is in the advanced position, movement of the driven drum.

5. The clutch mechanism according to claim 1 , wherein
the drive drum has a drive pin vertically provided on its circumferential surface,
the driven drum is provided with
a cam surface that comes into contact with the side surface of the drive pin to restrict movement of the driven drum in the advancing direction, and
another cam surface that comes into contact with the side surface of the drive pin to restrict movement of the driven drum in the retreating direction,
as the drive pin pivots in accordance with pivoting of the drive drum, the driven drum moves along the rotational axis according to the profiles of the cam surface and the other cam surface, and
the cam surface lacks a portion that restricts, when the driven drum is in the advanced position, movement of the driven drum.

Assignees

• Toyota Chuo Kenkyusho Kk
• Toyota Motor Co Ltd

Inventors

• Shiotsu Isamu
• Yoshino Hirotsugu
• Komada Hideaki
• Suzuki Yosuke

Classifications

• F16H63/08 Primary

  Multiple final output mechanisms being moved by a single common final actuating mechanism · CPC title

• F16H63/18 Primary

  the final actuating mechanism comprising cams · CPC title

• F16D11/14 Primary

  with clutching members movable only axially (F16D11/02, F16D11/08 take precedence) · CPC title

• F16D2023/123

  Clutch actuation by cams, ramps or ball-screw mechanisms · CPC title