Damper device

Patent metadata

Field	Value
Publication number	US-12049937-B2
Application number	US-202117380293-A
Country	US
Kind code	B2
Filing date	Jul 20, 2021
Priority date	Aug 20, 2020
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A damper device includes a first rotor, a second rotor, an elastic coupling part having first and second elastic members, and a hysteresis generating mechanism. The hysteresis generating mechanism includes a friction member, and generates a hysteresis torque. The friction member does not make frictional contact with the first and second rotors in a first torsion angular range where the torsion is caused between the first and second rotors by a first torsion angle from a neutral condition, makes frictional contact with the first or second rotor in a second torsion angular range exceeding the first torsion angle so as to generate the hysteresis torque, and does not make frictional contact with the first and second rotors in a predetermined torsion angular range within the second torsion angular range. In the neutral condition, the friction member is set in a neutral position by actuation of the elastic coupling part.

First claim

What is claimed is:

1. A damper device, comprising:
a first rotor by which torque is input into the damper device and arranged to be rotated about a rotational axis;
a second rotor by which torque is output from the damper device and arranged to be rotated about the rotational axis, the second rotor disposed to be rotatable relative to the first rotor;
an elastic coupling part including a first elastic member and a second elastic member, the elastic coupling part configured to elastically couple the first and second rotors in a rotational direction; and
a hysteresis generating mechanism configured to generate a hysteresis torque when torsion is caused by rotation of the second rotor relative to the first rotor, the hysteresis generating mechanism including a friction member configured to cause friction by sliding relative to the first or the second rotor,
wherein the friction member of the hysteresis generating mechanism does not cause friction by sliding relative to either the first rotor or the second rotor in a first torsion angular range extending from a neutral condition where there is no torsion between the first and second rotors to a first torsion angle in the rotational direction,
the friction member causes friction by sliding relative to the first or second rotor so as to generate the hysteresis torque in a second torsion angular range exceeding the first torsion angle, the friction member not causing friction by sliding relative to the first and second rotors in a predetermined torsion angular sub-range within the second torsion angular range,
the friction member is further configured to be held in a neutral position by contact with and compression of the first and second elastic members when the first and second rotors are in the neutral condition,
the first rotor includes a first support portion with a width in the circumferential direction of the first rotor and a second support portion with a width in the circumferential direction of the first rotor, and the second rotor includes a first accommodation portion with a width in the circumferential direction of the second rotor and a second accommodation portion with a width in the circumferential direction of the second rotor, the width of the first accommodation portion being the same as the width of the first support portion and the width of the second accommodation portion being the same as the width of the second support portion,
the first accommodation portion is disposed to overlap in part the first support portion and to be angularly offset from the first support portion in the first rotational direction when the first and second rotors are in the neutral condition, and the second accommodation portion is disposed to overlap in part the second support portion and to be angularly offset from the second support portion in the second rotational direction when the first and second rotors are in the neutral condition, and
the first elastic member is compressed in the first support portion and the first accommodation portion when the first and second rotors are in the neutral condition, and the second elastic member is compressed in the second support portion and the second accommodation portion when the first and second rotors are in the neutral condition, the second elastic member actuated in parallel with the first elastic member and expansionary forces within the first and second elastic members counteracting each other when the first and second rotors are in the neutral condition to hold the first and second rotors in the neutral condition and the friction member in the neutral position.

2. The damper device according to claim 1 , wherein
the amount of angular offset in the first rotational direction of the first accommodation portion relative to the first support portion is equal to the amount of angular offset in the second rotational direction of the second accommodation portion relative to the second support portion,
the first torsion angle is greater than a torsion angle corresponding to the amount of angular offset,
the friction member does not cause friction by sliding relative to either the first rotor or the second rotor when the first and second rotors are rotated relative to each other from the neutral condition by the torsion angle corresponding to the amount of angular offset and when the torsion is caused by relative rotation between the first and second rotors from the neutral condition to the first torsion angle, and
the friction member causes friction by sliding relative to either the first or the second rotor when the first and second rotors rotate relative to each other by the torsion angle corresponding to the amount of angular offset, the friction member not causing friction by sliding relative to either the first rotor or the second rotor in a torsion angular range of a difference between the first torsion angle and the torsion angle corresponding to the amount of angular offset.

3. The damper device according to claim 2 , wherein the friction member is rotatable relative to the first or second rotor until the torsion is equal to the torsion angle corresponding to the amount of angular offset and until the torsion is equal to the first torsion angle.

4. The damper device according to claim 1 , wherein the friction member includes first and second contact surfaces that face in opposite rotational directions, with an end surface of one of the first and second elastic members being arranged to make contact with one of the first and second contact surfaces and an end surface of the other of the first and second elastic members being arranged to make contact with the other of the first and second contact surfaces.

5. The damper device according to claim 1 , wherein
when in an uncompressed free state, the length of the first elastic member is the same as the widths of the first support portion and the first accommodation portion in the circumferential directions of the first and second rotors, respectively, and when in an uncompressed free state, the length of the second elastic member is the same as the widths of the second support portion and the second accommodation portion in the circumferential directions of the first and second rotors, respectively,
the angular offset of the first accommodation portion relative to the first support portion causes 1) the first elastic member to transition from an initial compressed state thereof to its uncompressed free state and then to be further recompressed as the first rotor rotates from the neutral condition in the first rotational direction with respect to the second rotor, and 2) the first elastic member to be further compressed from the initial compressed state thereof as the first rotor rotates from the neutral condition in the second rotational direction with respect to the second rotor, and
the angular offset of the second accommodation portion relative to the second support portion causes 1) the second elastic member to transition from an initial compressed state thereof to its uncompressed free state and then to be recompressed as the first rotor rotates from the neutral condition in the second rotational direction with respect to the second rotor, and 2) the second elastic member to be further compressed from the initial compressed state thereof as the first rotor rotates from the neutral condition in the second rotational direction with respect to the second rotor.

6. The damper device according to claim 5 , wherein
the first and second support portions each include a first support surface at a first-rotational-direction end thereof, and the first and second support portions each include a second support surface at a second-rotational-direction end thereof,
the first and second accommodation portions each include a first accommodation surface at a first-r

Assignees

• Exedy Corp

Inventors

• Uehara Hiroshi
• Aoki Masahiko

Classifications

• F16D7/025

  with flat clutching surfaces, e.g. discs · CPC title

• F16D43/26

  acting at definite angular position or disengaging after {consecutive} definite number of rotations (actuating by means of stationary abutment F16D11/02, F16D13/02, F16D15/00; control of change-speed or reversing-gearings conveying rotary motion F16H59/00 - F16H63/00) · CPC title

• F16F15/13492

  the sets of springs being arranged at substantially the same radius · CPC title

• F16F15/1392 Primary

  characterised by arrangements for axially clamping or positioning or otherwise influencing the frictional plates · CPC title

• F16F15/12373 Primary

  the sets of springs being arranged at substantially the same radius · CPC title