Torque fluctuation inhibiting device, torque converter and power transmission device

Patent metadata

Field	Value
Publication number	US-10184542-B2
Application number	US-201615576784-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Aug 20, 2015
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A torque fluctuation inhibiting device includes a mass body, a plurality of centrifugal elements, an actuation preventing mechanism and a cam mechanism. The mass body is rotatable with a rotor, and is rotatable relatively to the rotor. Each of the centrifugal elements is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body, and is movable in a radial direction. The actuation preventing mechanism restricts at least one of the centrifugal elements from moving outward in the radial direction when the rotor or the mass body is rotated at a predetermined speed or greater. The cam mechanism converts the centrifugal force into a circumferential force with use of actuation of the plurality of centrifugal elements moved in the radial direction by the centrifugal force when a relative displacement is produced between the rotor and the mass body in a rotational direction.

First claim

The invention claimed is:

1. A torque fluctuation inhibiting device for inhibiting torque fluctuations in a rotor to which a torque is inputted, the torque fluctuation inhibiting device comprising:
a mass body disposed to be rotatable with the rotor and be rotatable relatively to the rotor;
a plurality of centrifugal elements, each of the plurality of centrifugal elements disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body, each of the plurality of centrifugal elements movable in a radial direction;
an actuation preventing mechanism for restricting at least one of the plurality of centrifugal elements from moving outward in the radial direction when the rotor or the mass body is rotated at a predetermined speed or greater; and
a cam mechanism for converting the centrifugal force into a circumferential force with use of actuation of each of the plurality of centrifugal elements moved in the radial direction by the centrifugal force when a relative displacement is produced between the rotor and the mass body in a rotational direction, the circumferential force directed to reduce the relative displacement.

2. The torque fluctuation inhibiting device according to claim 1 , wherein
the actuation preventing mechanism includes
a pin disposed on the rotor or the mass body on which the plurality of centrifugal elements are disposed, the pin extending in a direction arranged along a rotational axis direction of the rotor, and
a turn member turnably supported about the pin, the turn member including a pawl part and a weight part, the pawl part for making contact with an outer peripheral surface of the at least one of the plurality of centrifugal elements, the pawl part provided on one end of the turn member, the weight part provided on the other end of the turn member, the one end and the other end disposed circumferentially on both sides of the pin, and

the weight part is turned to an outer peripheral side in conjunction with the rotation of the rotor and the mass body, and the pawl part prevents the at least one of the plurality of centrifugal elements from moving in the radial direction when the rotor or the mass body is rotated at the predetermined speed or greater.

3. The torque fluctuation inhibiting device according to claim 2 , wherein the actuation preventing mechanism further includes an urging member, the urging member for urging the turn member such that the weight part is moved to an inner peripheral side.

4. The torque fluctuation inhibiting device according to claim 3 , wherein the mass body is disposed on an outer or inner periphery of the rotor.

5. The torque fluctuation inhibiting device according to claim 4 , wherein
one of the rotor and the mass body includes a plurality of recesses on an outer peripheral surface thereof, the one of the rotor and the mass body disposed on the inner peripheral side, and
each of the plurality of centrifugal elements is accommodated in each of the plurality of recesses so as to be movable in the radial direction.

6. The torque fluctuation inhibiting device according to claim 5 , wherein a friction coefficient between each of the plurality of centrifugal elements and each of the plurality of recesses of the one of the rotor and the mass body is less than or equal to 0.1.

7. The torque fluctuation inhibiting device according to claim 5 , wherein a friction reducing member is disposed between a lateral surface of each of the plurality of centrifugal elements and each of the plurality of recesses of the one of the rotor and the mass body so as to reduce friction that occurs in movement of each of the plurality of centrifugal elements, the lateral surface disposed along a moving direction of each of the plurality of centrifugal elements.

8. The torque fluctuation inhibiting device according to claim 5 , wherein the cam mechanism includes
a cam follower provided on each of the plurality of centrifugal elements, and
a cam with which the cam follower makes contact, the cam provided on an inner peripheral surface of the other of the rotor and the mass body, the other of the rotor and the mass body disposed on the outer peripheral side, 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.

9. The torque fluctuation inhibiting device according to claim 8 , further comprising:
an urging member disposed inside one of the plurality of recesses, the urging member for urging one of the plurality of centrifugal elements outward in the radial direction such that the cam follower of the one of the plurality of centrifugal elements makes contact with the cam while the rotor and the mass body are not being rotated.

10. The torque fluctuation inhibiting device according to claim 8 , wherein the cam follower is a roller disposed on the outer peripheral surface of each of the plurality of centrifugal elements.

11. The torque fluctuation inhibiting device according to claim 8 , wherein the cam follower is a protruding part integrated with each of the plurality of centrifugal elements, the protruding part provided on the outer peripheral surface of each of the plurality of centrifugal elements.

12. The torque fluctuation inhibiting device according to claim 5 , wherein the cam mechanism includes
a cam follower provided on an inner peripheral surface of the other of the rotor and the mass body, the other of the rotor and the mass body disposed on the outer peripheral side, and
a cam for making contact at an outer peripheral surface thereof with the cam follower, the cam provided on each of the plurality of centrifugal elements, 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.

13. The torque fluctuation inhibiting device according to claim 4 , wherein
one of the rotor and the mass body includes a plurality of recesses on an inner peripheral surface thereof, the one of the rotor and the mass body disposed on the outer peripheral side,
each of the plurality of centrifugal elements is accommodated in each of the plurality of recesses so as to be movable in the radial direction, and
the cam mechanism includes
a cam follower provided on each of the plurality of centrifugal elements, and
a cam with which the cam follower makes contact, the cam provided on an inner peripheral surface of the other of the rotor and the mass body, the other of the rotor and the mass body disposed on the inner peripheral side, 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.

14. The torque fluctuation inhibiting device according to claim 1 , wherein the mass body has a continuous annular shape.

15. The torque fluctuation inhibiting device according to claim 1 , wherein the mass body includes
a plurality of divided mass bodies disposed in circumferential alignment, and
a holding member for holding the plurality of divided mass bodies in the radial direction.

16. A torque converter disposed between an engine and a transmission, the torque converter comprising:
an input-side rotor to which the 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 .

Assignees

• Exedy Corp

Inventors

• Tomiyama Naoki
• Hagihara Yoshiyuki
• Higuchi Koichi

Classifications

• F16H45/02 Primary

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• F16F15/145

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

• F16F15/1457

  Systems with a single mass · CPC title

• Y10T74/2121

  Flywheel, motion smoothing-type · CPC title

• Y10T74/2128

  Damping using swinging masses, e.g., pendulum type, etc. · CPC title