Torque fluctuation inhibiting device, torque converter and power transmission device

Patent metadata

Field	Value
Publication number	US-10619703-B2
Application number	US-201816121295-A
Country	US
Kind code	B2
Filing date	Sep 4, 2018
Priority date	Sep 15, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A torque fluctuation inhibiting device includes plural centrifugal elements movable in a radial direction when receiving a centrifugal force generated in rotation of a rotor and a mass body. Each centrifugal element receives a rotational moment of inertia about an axis arranged in parallel to a rotational axis of the rotor when receiving the centrifugal force. When a relative displacement is produced between the rotor and the mass body in a rotational direction due to the centrifugal force acting on each centrifugal element, each cam mechanism converts the centrifugal force into a circumferential force directed to reduce the relative displacement. Support portions are provided on either the rotor or the mass body, and each makes contact with part of each centrifugal element when each centrifugal element receives the rotational moment of inertia. Each support portion supports each centrifugal element such that each centrifugal element is movable in the radial direction.

First claim

What is claimed is:

1. A torque fluctuation inhibiting device, the torque fluctuation inhibiting device comprising:
a rotor to which a torque is inputted;
a mass body disposed to be rotatable with the rotor and be rotatable relative to the rotor;
a plurality of centrifugal elements, each movable in a radial direction when receiving a centrifugal force generated in rotation of the rotor and the mass body, each of the plurality of centrifugal elements for receiving a rotational moment of inertia about an axis arranged in parallel to a rotational axis of the rotor when receiving the centrifugal force;
a plurality of cam mechanisms, each for converting the centrifugal force into a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction due to the centrifugal force that acts on each of the plurality of centrifugal elements, the circumferential force directed to reduce the relative displacement; and
a plurality of support portions provided on either the rotor or the mass body, each for making contact with part of each of the plurality of centrifugal elements when each of the plurality of centrifugal elements receives the rotational moment of inertia, each of the plurality of support portions for supporting each of the plurality of centrifugal elements such that each of the plurality of centrifugal elements is movable relative to each of the plurality of support portions in the radial direction along an extending direction of each of the plurality of support portions with a roller interposed between each of the plurality of centrifugal elements and each of the plurality of support portions.

2. The torque fluctuation inhibiting device according to claim 1 , wherein
each of the plurality of cam mechanisms includes
a cam provided on each of the plurality of centrifugal elements, and
a cam follower provided on the mass body, the cam follower for being moved along the cam, and

each of the plurality of centrifugal elements includes a weight portion, each of the plurality of centrifugal elements having a center of gravity that deviates from a straight line connecting a rotational center of the rotor and a point at which the cam and the cam follower make contact with each other while the relative displacement is not produced.

3. The torque fluctuation inhibiting device according to claim 2 , wherein each of the plurality of centrifugal elements has an asymmetric shape with reference to a straight line connecting the rotational center of the rotor and a point at which the cam and the cam follower make contact with each other while each of the plurality of centrifugal elements receives the centrifugal force and simultaneously the relative displacement is not produced.

4. The torque fluctuation inhibiting device according to claim 2 , wherein each of the plurality of centrifugal elements is moved in a direction slanting with respect to a straight line connecting a rotational center of the rotor and a point at which the cam and the cam follower make contact with each other while the relative displacement is not produced.

5. The torque fluctuation inhibiting device according to claim 2 , wherein
the mass body includes a first inertia ring, a second inertia ring and a pin, the first and second inertia rings disposed in opposition to each other through the rotor, the pin for coupling the first and second inertia rings to each other while the first and second inertia rings are non- rotatable relative to each other,
each of the plurality of centrifugal elements is disposed on an outer peripheral part of the rotor and on an inner peripheral side of the pin while disposed between the first inertia ring and the second inertia ring in an axial direction,
the cam follower is a cylindrical roller, the cylindrical roller including a hole in an inner part thereof, the hole penetrated by the pin in the axial direction, and
the cam is provided on each of the plurality of centrifugal elements so as to make contact with the cam follower, the cam having a shape for making the circumferential force vary in accordance with an amount of the relative displacement between the rotor and the mass body in the rotational direction.

6. The torque fluctuation inhibiting device according to claim 1 , wherein the plurality of centrifugal elements include
a plurality of first centrifugal elements, on each of which the rotational moment of inertia acts in a first direction, and
a plurality of second centrifugal elements, on each of which the rotational moment of inertia acts in a second direction, the plurality of second centrifugal elements being equal in number to the plurality of first centrifugal elements.

7. The torque fluctuation inhibiting device according to claim 6 , wherein the plurality of centrifugal elements include
the plurality of first centrifugal elements, each of the plurality of first centrifugal elements having a center of gravity that deviates to a first side in the rotational direction, and
the plurality of second centrifugal elements being equal in number to the plurality of first centrifugal elements, each of the plurality of second centrifugal elements having a center of gravity that deviates to a second side in the rotational direction.

8. The torque fluctuation inhibiting device according to claim 6 , wherein the plurality of first centrifugal elements are disposed in pair to be opposed through the rotational center of the rotor while the plurality of second centrifugal elements are disposed in pair to be opposed through the rotational center of the rotor.

9. The torque fluctuation inhibiting device according to claim 1 , wherein
the rotor includes a plurality of recessed portions on an outer peripheral surface thereof, each of the plurality of recessed portions opened radially outward, each of the plurality of recessed portions accommodating each of the plurality of centrifugal elements,
the roller includes a first guide roller and a second guide roller, the first guide roller rotatably attached to a first circumferentially lateral part of each of the plurality of centrifugal elements, the second guide roller rotatably attached to a second circumferentially lateral part of each of the plurality of centrifugal elements, and
each of the plurality of support portions includes first and second sidewalls of each of the plurality of recessed portions, the first sidewall for enabling the first guide roller to make contact therewith, the second sidewall for enabling the second guide roller to make contact therewith.

10. The torque fluctuation inhibiting device according to claim 9 , wherein each of the first and second guide rollers includes an outer peripheral side rolling element and an inner peripheral side rolling element, the inner peripheral side rolling element disposed radially inside the outer peripheral side rolling element.

11. A torque converter disposed between an engine and a transmission, the torque converter comprising:
an input-side rotor to which a torque is inputted from the engine;
an output-side rotor for outputting the torque to the transmission;
a damper disposed between the input-side rotor and the output-side rotor; and
the torque fluctuation inhibiting device recited in claim 1 .

12. A power transmission device comprising:
a flywheel including a first inertia body, a second inertia body and a damper, the first inertia body rotated about a rotational axis, the second inertia body rotated about the rotational axis, the second inertia body rotatable relative to the first inertia body, the damper disposed between the first inertia body and the second inertia body;
a clutch device provided on t

Assignees

• Exedy Corp

Inventors

• Kawahara Yuki
• Tomita Yusuke

Classifications

• F16H2045/0263

  the damper comprising a pendulum · CPC title

• F16F15/145 Primary

  Masses mounted with play with respect to driving means thus enabling free movement over a limited range · CPC title

• F16F2230/0064

  using a cam · CPC title

• F16H45/02

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