Torque fluctuation inhibiting device, torque converter and power transmission device

Patent metadata

Field	Value
Publication number	US-10495178-B2
Application number	US-201816057768-A
Country	US
Kind code	B2
Filing date	Aug 7, 2018
Priority date	Aug 23, 2017
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A torque fluctuation inhibiting device includes a mass body. The mass body disposed to be rotatable with a rotor and be rotatable relatively to the rotor. Each of a plurality of centrifugal elements is radially movable by a centrifugal force that acts thereon in rotation of the rotor and the mass body. When a relative displacement is produced between the rotor and the mass body in a rotational direction while the centrifugal force is acting on the each of the plurality of centrifugal elements, each of a plurality of cam mechanisms converts the centrifugal force into a circumferential force directed to reduce the relative displacement. A plurality of restriction members allow the plurality of centrifugal elements to move in actuation of the plurality of cam mechanisms, and restrict the plurality of centrifugal elements from moving radially inward in non-actuation of the plurality of cam mechanisms.

First claim

What is 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 radially movable by a centrifugal force that acts thereon in rotation of the rotor and the mass body;
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 while the centrifugal force is acting on the each of the plurality of centrifugal elements, the circumferential force directed to reduce the relative displacement; and
a plurality of restriction members for allowing the plurality of centrifugal elements to move in actuation of the plurality of cam mechanisms, the plurality of restriction members for restricting the plurality of centrifugal elements from moving radially inward in non-actuation of the plurality of cam mechanisms.

2. The torque fluctuation inhibiting device according to claim 1 , wherein the plurality of centrifugal elements are disposed in circumferential alignment, and each of the plurality of restriction members is disposed circumferentially between adjacent two of the plurality of centrifugal elements.

3. The torque fluctuation inhibiting device according to claim 2 , wherein
the each of the plurality of restriction members includes a first contact portion provided on one circumferential end thereof and a second contact portion provided on the other circumferential end thereof,
the first contact portion is contactable to a first circumferential side lateral surface of one of the adjacent two of the plurality of centrifugal elements, and
the second contact portion is contactable to a second circumferential side lateral surface of the other of the adjacent two of the plurality of centrifugal elements.

4. The torque fluctuation inhibiting device according to claim 3 , wherein the each of the plurality of restriction members is elastically deformable in accordance with movement of the adjacent two of the plurality of centrifugal elements.

5. The torque fluctuation inhibiting device according to claim 3 , wherein the each of the plurality of restriction members is elastically deformable in directions that make the first contact portion and the second contact portion approach each other.

6. The torque fluctuation inhibiting device according to claim 3 , further comprising:
a stopper mechanism for restricting a relative rotation between the rotor and the mass body to a predetermined angular range, the stopper mechanism including a stop pin and an elongated hole, the stop pin supported by one of the rotor and the mass body, the elongated hole provided in the other of the rotor and the mass body, the elongated hole circumferentially elongated, the elongated hole penetrated by the stop pin.

7. The torque fluctuation inhibiting device according to claim 6 , wherein the plurality of restriction members each includes
a support portion supported by the mass body,
a first spring portion extending radially inward from the support portion, the first spring portion including a first contact portion on a tip thereof, and
a second spring portion extending radially inward from the support portion so as to gradually separate from the first spring portion with radially inward extension thereof, the second spring portion including a second contact portion on a tip thereof.

8. The torque fluctuation inhibiting device according to claim 7 , wherein the support portion of the each of the plurality of restriction members is supported by a stop pin.

9. The torque fluctuation inhibiting device according to claim 1 , wherein
the rotor includes a plurality of recesses on an outer peripheral surface thereof,
the plurality of centrifugal elements are accommodated in the plurality of recesses of the rotor respectively, and
the plurality of restriction members restrict inner peripheral surfaces of the plurality of centrifugal elements from making contact with bottom surfaces of the plurality of recesses respectively.

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

11. The torque fluctuation inhibiting device according to claim 10 , wherein the cam and the cam follower of the each of the plurality of cam mechanisms are not pressed against each other in non-actuation of the each of the plurality of cam mechanisms.

12. The torque fluctuation inhibiting device according to claim 10 , 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 through the rotor, the pin coupling the first and second inertia rings so as to make the first and second inertia rings non-rotatable relatively to each other,
the plurality of centrifugal elements are disposed on an outer peripheral part of the rotor and on an inner peripheral side of the pin while disposed axially between the first inertia ring and the second inertia ring,
the cam follower is a cylindrical roller, the cylindrical roller including a hole in an inner part thereof the hole axially penetrated by the pin, and
the cam is provided on the each of the plurality of centrifugal elements so as to make contact with the cam follower, the cam having a shape 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 1 , further comprising:
a stopper mechanism for restricting a relative rotation between the rotor and the mass body to a predetermined angular range, wherein
the plurality of cam mechanisms are not actuated in and after actuation of the stopper mechanism.

14. 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 .

15. 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 relatively to the first inertia body, the damper disposed between the first inertia body and the second inertia body;
a clutch device provided on the second inertia body of the flywheel; and
the torque fluctuation inhibiting device recited in claim 1 .

Assignees

• Exedy Corp

Inventors

• Tomita Yusuke
• Sakai Keisuke

Classifications

• F16F15/145 Primary

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

• F16F15/1421

  Metallic springs, e.g. coil or spiral springs · CPC title

• F16H41/24

  Details · CPC title

• F16H57/0006

  Vibration-damping or noise reducing means specially adapted for gearings (devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183) · CPC title

• F16F15/30

  Flywheels (F16F15/16, F16F15/28 take precedence; suppression of vibrations in rotating systems using elastic members or friction-damping members moving with the system, {i.e. split flywheels or single masses connected to a hub by elastic members or friction-damping members} F16F15/12; rotary-body aspects in general F16C13/00, F16C15/00) · CPC title