Clutch device

Patent metadata

Field	Value
Publication number	US-11808308-B2
Application number	US-202217582780-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Jul 26, 2019
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A sun gear of a speed reducer is provided coaxially with and integrally rotatably with a rotor of a prime mover. Multiple planetary gears are disposed in a circumferential direction of the sun gear, and are capable of revolving in the circumferential direction of the sun gear while rotating in a state of meshing with the sun gear. A carrier rotatably supports the planetary gears, and is rotatable relative to the sun gear. A first ring gear is fixed to a housing, and has a first ring gear tooth portion capable of meshing with the planetary gears. A second ring gear is rotatable integrally with a rotation portion, and has a second ring gear tooth portion capable of meshing with the planetary gears. The second ring gear tooth portion is different in number of teeth from the first ring gear tooth portion.

First claim

What is claimed is:

1. A clutch device comprising:
a housing;
a prime mover including a stator fixed to the housing, and a rotor relatively rotatable relative to the housing, the prime mover being capable of outputting torque from the rotor;
a speed reducer configured to output the torque of the prime mover at a reduced speed;
a rotational translation unit including a rotation portion configured to be rotatable relative to the housing upon receiving an input of the torque output from the speed reducer, and a translation portion configured to move relative to the rotation portion and the housing in an axial direction in accordance with rotation of the rotation portion relative to the housing;
a clutch disposed between a first transmission portion and a second transmission portion that are rotatable relative to the housing, the clutch being configured to allow transmission of torque between the first transmission portion and the second transmission portion in an engaged state of the clutch, and to interrupt the transmission of the torque between the first transmission portion and the second transmission portion in a disengaged state of the clutch; and
a state changing unit configured to receive a force along the axial direction from the translation portion and change a state of the clutch to the engaged state or the disengaged state according to a position of the translation portion in the axial direction relative to the housing, wherein
the speed reducer includes
a sun gear coaxial and integrally rotatable with the rotor,
planetary gears disposed in a circumferential direction of the sun gear and configured to revolve in the circumferential direction of the sun gear while rotating in a state of meshing with the sun gear,
a carrier rotatably supporting the planetary gears and being rotatable relative to the sun gear,
a first ring gear fixed to the housing and including a first ring gear tooth portion capable of meshing with the planetary gears, and
a second ring gear rotatable integrally with the rotation portion and including a second ring gear tooth portion capable of meshing with the planetary gears, the second ring gear tooth portion being different in number of teeth from the first ring gear tooth portion, and

the translation portion is non-rotatable relative to the housing;
the rotor and the rotation portion are coaxial.

2. The clutch device according to claim 1 , wherein
the rotation portion includes a drive cam plate portion located between the planetary gears and the clutch.

3. The clutch device according to claim 1 , wherein
the rotor is disposed radially inward of the stator.

4. The clutch device according to claim 1 , wherein
the rotation portion is a drive cam having drive cam grooves formed on one surface of the rotation portion,
the translation portion is a driven cam having driven cam grooves formed on one surface of the translation portion, and
the rotational translation unit is a rolling body cam including the drive cam, the driven cam, and rolling bodies rollable between the drive cam grooves and the driven cam grooves.

5. The clutch device according to claim 4 , wherein
the rolling bodies are disposed radially inward of the first ring gear and the second ring gear.

6. The clutch device according to claim 1 , wherein
the state changing unit includes an elastic deformation portion elastically deformable in the axial direction.

Assignees

• Denso Corp

Inventors

• Sugiura Takumi

Classifications

• F16D23/12 Primary

  Mechanical clutch-actuating mechanisms arranged outside the clutch as such (specific for combined clutches F16D21/00; mechanisms specific for synchronisation F16D23/02) · CPC title

• F16H37/124

  for interconverting rotary motion and reciprocating motion · CPC title

• H02K7/108

  with friction clutches · CPC title

• H02K7/116 Primary

  with gears · CPC title

• F16D13/52

  Clutches with multiple lamellae {; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member (F16D13/385 takes precedence)} · CPC title