Rotary device and power transmission device

Patent metadata

Field	Value
Publication number	US-2022010794-A1
Application number	US-202117340367-A
Country	US
Kind code	A1
Filing date	Jun 7, 2021
Priority date	Jul 7, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

A rotary device includes a first rotor, a second rotor, a centrifugal element, and a first rolling member. The first rotor includes an accommodation portion having first and second guide surfaces. The first and second guide surfaces face both sides in a circumferential direction. The first rotor is disposed to be rotatable. The second rotor is disposed to be rotatable with and relative to the first rotor. The centrifugal element is disposed within the accommodation portion. The centrifugal element is disposed to be radially movable by a centrifugal force acting thereon in rotation of the first or second rotor. The centrifugal element rotates about a rotational axis thereof in radial movement thereof. The first rolling member is disposed between the first guide surface and the centrifugal element. The first rolling member rolls on the first guide surface in accordance with rotation of the centrifugal element about the rotational axis thereof.

First claim

What is claimed is:

1 . A rotary device comprising:
a first rotor disposed to be rotatable, the first rotor including an accommodation portion having a first guide surface and a second guide surface, the first and second guide surfaces facing both sides in a circumferential direction; a second rotor disposed to be rotatable with the first rotor and be rotatable relative to the first rotor; a centrifugal element disposed within the accommodation portion, the centrifugal element disposed to be radially movable by a centrifugal force acting thereon in rotation of the first or second rotor, the centrifugal element configured to rotate about a rotational axis thereof in radial movement thereof; and a first rolling member disposed between the first guide surface and the centrifugal element, the first rolling member configured to roll on the first guide surface in accordance with rotation of the centrifugal element about the rotational axis thereof.

2 . The rotary device according to claim 1 , wherein the centrifugal element is configured to roll on the second guide surface.

3 . The rotary device according to claim 2 , wherein
the centrifugal element and the first rolling member are each made in shape of a hollow or solid cylinder, and a distance between the first guide surface and the second guide surface is less than a sum of a diameter of the centrifugal element and a diameter of the first rolling member.

4 . The rotary device according to claim 1 , further comprising:
a second rolling member disposed between the second guide surface and the centrifugal element, the second rolling member configured to roll on the second guide surface in accordance with the rotation of the centrifugal element about the rotational axis thereof.

5 . The rotary device according to claim 4 , wherein
the centrifugal element includes
a centrifugal element body including a first end portion and a second end portion in the circumferential direction,
a first rotary part attached to be rotatable to the first end portion of the centrifugal element body, and
a second rotary part attached to be rotatable to the second end portion of the centrifugal element body,
the first rolling member is disposed between the first guide surface and the first rotary part, the first rolling member configured to roll on the first guide surface in accordance with rotation of the first rotary part about a rotational axis thereof, and the second rolling member is disposed between the second guide surface and the second rotary part, the second rolling member configured to roll on the second guide surface in accordance with rotation of the second rotary part about a rotational axis thereof.

6 . The rotary device according to claim 1 , further comprising:
a cam mechanism configured to receive the centrifugal force acting on the centrifugal element, the cam mechanism further configured to convert the centrifugal force into a circumferential force directed to reduce rotational phase difference between the first rotor and the second rotor, wherein the cam mechanism includes
a cam surface provided on the centrifugal element, and
a cam follower configured to contact the cam surface, the cam follower further configured to transmit a force therethrough between the centrifugal element and the second rotor.

7 . The rotary device according to claim 6 , wherein the cam follower is further configured to roll on the cam surface.

8 . The rotary device according to claim 6 , wherein
the centrifugal element includes a first through hole axially penetrating therethrough, and the cam surface is provided as part of an inner wall surface of the first through hole.

9 . The rotary device according to claim 6 , wherein the cam follower is attached to the second rotor in a state of being rotatable about a rotational axis thereof.

10 . The rotary device according to claim 6 , wherein
the second rotor includes a second through hole, and the cam follower is configured to roll on an inner wall surface of the second through hole.

11 . The rotary device according to claim 6 , wherein the cam follower is a roller made in shape of a solid or hollow cylinder.

12 . The rotary device according to claim 2 , further comprising:
a cam follower made in shape of a solid or hollow cylinder, wherein the centrifugal element includes a first through hole axially extending, the second rotor includes a second through hole axially extending, the first through hole includes a cam surface provided as part of an inner wall surface thereof, the cam surface facing radially outward, the cam surface configured to contact the cam follower, the second through hole includes a contact surface provided as part of an inner wall surface thereof, the contact surface facing radially inward, the contact surface configured to contact the cam follower, the cam surface includes a first region and a second region, the first region configured to contact the cam follower when the centrifugal element rolls on the first guide surface through the first rolling member, the second region configured to contact the cam follower when the centrifugal element rolls on the second guide surface, and the first region is different in curved surface shape from the second region.

13 . The rotary device according to claim 12 , wherein the first region is less in curvature radius than the second region.

14 . The rotary device according to claim 12 , wherein
the contact surface includes a third region and a fourth region, the third region configured to contact the cam follower when the centrifugal element rolls on the first guide surface through the first rolling member, the fourth region configured to contact the cam follower when the centrifugal element rolls on the second guide surface, and the third region is different in curved surface shape from the fourth region.

15 . The rotary device according to claim 2 , further comprising:
a cam follower made in shape of a solid or hollow cylinder, wherein the centrifugal element includes a first through hole axially extending, the second rotor includes a second through hole axially extending, the first through hole includes a cam surface provided as part of an inner wall surface thereof, the cam surface facing radially outward, the cam surface configured to contact the cam follower, the second through hole includes a contact surface provided as part of an inner wall surface thereof, the contact surface facing radially inward, the contact surface configured to contact the cam follower, the contact surface includes a third region and a fourth region, the third region configured to contact the cam follower when the centrifugal element rolls on the first guide surface through the first rolling member, the fourth region configured to contact the cam follower when the centrifugal element rolls on the second guide surface, and the third region is different in curved surface shape from the fourth region.

16 . The rotary device according to claim 14 , wherein the third region is greater in curvature radius than the fourth region.

17 . The rotary device according to claim 12 , further comprising:
a state maintaining mechanism configured to maintain a state of the centrifugal element such that a boundary between the first region and the second region contacts the cam follower when the first rotor and the second rotor are unitarily rotated with each other without being rotated relative to each other.

18 . The rotary device according to claim 17 , wherein the state maintain

Assignees

• Exedy Corp

Inventors

• Okamachi Yusuke
• Higuchi Koichi

Classifications

• F16F15/1202

  the damping action being at least partially controlled by centrifugal masses (F16F15/13128 takes precedence) · CPC title

• F16F15/14 Primary

  using masses freely rotating with the system, {i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers (compensation of inertia forces F16F15/22; weights for balancing rotating bodies F16F15/32)} · CPC title

• F16F15/22

  Compensation of inertia forces {(suppression of vibrations of rotating systems by favourable grouping or relative arrangements of the moving members of the system or systems F16F15/20, counterweights F16F15/28; correcting-weights for balancing rotating bodies F16F15/32)} · CPC title

• F16H2045/0221

  with damping means · CPC title

• F16H45/02 Primary

  with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14) · CPC title