Clutch device

Patent metadata

Field	Value
Publication number	US-11767890-B2
Application number	US-202217582410-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Jul 26, 2019
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A prime mover includes a stator fixed to a housing and a rotor relatively rotatable relative to the stator. The prime mover outputs torque from the rotor by being supplied with electric power. A speed reducer reduces the torque of the prime mover and outputs the reduced torque. One bearing portion rotatably supports the rotor. The speed reducer includes an input portion that is coaxial and integrally rotatable with the rotor and receives the torque from the rotor.

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 rotatable relative to the stator, the prime mover being capable of outputting torque from the rotor by supply of electric power to the prime mover;
a speed reducer configured to reduce torque of the prime mover and output the reduced torque;
a rotational translation unit including a rotation portion configured to rotate 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 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;
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; and
one bearing portion rotatably supporting the rotor, wherein
the speed reducer includes an input portion coaxial and integrally rotatable with the rotor and configured to receive the torque from the rotor,
the prime mover and the speed reducer are provided in an accommodation space formed inside the housing, the rotation portion being positioned between the accommodation space and the clutch,
the clutch is disposed in a clutch space, the rotation portion being positioned between the accommodation space and the clutch space, and
the clutch device further comprises an annular sealing member being in contact with the rotation portion and maintaining an air-tight or liquid-tight state between the accommodation space and the clutch space.

2. The clutch device according to claim 1 , wherein
the sealing member is an O-ring, a lip seal, or an oil seal.

3. The clutch device according to claim 1 , wherein
the bearing portion is a ball bearing, a roller bearing, or a plain bearing.

4. The clutch device according to claim 1 , wherein
the bearing portion is separated from the input portion in an axial direction of the bearing portion.

5. The clutch device according to claim 1 , wherein
the bearing portion is disposed radially inward or outward of the input portion to rotatably support the rotor.

6. The clutch device according to claim 1 , wherein
the prime mover includes a permanent magnet provided to the rotor.

7. The clutch device according to claim 1 , wherein
the speed reducer further includes
a planetary gear configured to revolve in a circumferential direction of the input portion while rotating in a state of meshing with the input portion,
a carrier having an annular shape, rotatably supporting the planetary gear and being rotatable relative to the input portion,
a first ring gear capable of meshing with the planetary gear, and
a second ring gear capable of meshing with the planetary gear and outputting the torque to the rotational translation unit, the second ring gear being different from the first ring gear in number of teeth of a tooth portion.

8. The clutch device according to claim 7 , wherein
the first ring gear is fixed to the housing, and
the second ring gear is rotatable integrally with the rotation portion.

9. The clutch device according to claim 7 , wherein
the rotation portion is formed integrally with the second ring gear.

10. 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.

11. The clutch device according to claim 1 , wherein
the rotation portion having an inner edge portion and an outer edge portion that are located at different positions in the axial direction.

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

Assignees

• Denso Corp

Inventors

• Sugiura Takumi
• Uchida Akikazu

Classifications

• F16D28/00 Primary

  Electrically-actuated clutches (arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00) · CPC title

• F16D13/58

  Details {(tools for assembling or disassembling clutches B25B27/0064)} · CPC title

• F16D23/12

  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

• H02K7/088

  radially supporting the rotor directly · CPC title