US 10,851,842 B2Granted

Power transmission device

AssigneeDenso Corporation

InventorsToshihiro Hayashi, Hiroki Nagahashi, Kiyoshi Kurohata, Toshihiro Konishi, Shigeyoshi Sakuraba, Takayuki Hirose

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Abstract

A power transmission device includes an electromagnet, a rotor, an armature and a hub that couples the armature to a shaft of a driving target device. The hub includes an outer hub coupled to the armature, an inner hub coupled to the shaft, and an elastic member interposed between the outer hub and the inner hub. An outer peripheral side of the inner hub includes plural extending parts each extending outward in a radial direction. An inner peripheral side of the outer hub includes an inner peripheral side wall that overlaps with the extending parts in a rotational direction and surrounds the extending parts. The elastic member is disposed in an unbonded state with respect to at least one of the inner hub and the outer hub between the outer peripheral side of the inner hub and the inner peripheral side of the outer hub.

Claims13

Dependent claims

A power transmission device that transmits a rotary driving force output from a driving source to a driving target device, the power transmission device comprising:

an electromagnet that generates an electromagnetic attraction force by energization;
a rotor that rotates by the rotary driving force;
an armature that is coupled to the rotor to rotate integrally with the rotor when the electromagnet is energized and detached from the rotor when the electromagnet is not energized;
and
a hub that couples the armature to a shaft of the driving target device, wherein:
the hub includes an outer hub coupled to the armature, an inner hub coupled to the shaft, and an elastic member interposed between the outer hub and the inner hub;
an outer peripheral side of the inner hub includes a plurality of extending parts each extending outward in a radial direction of the shaft;
an inner peripheral side of the outer hub includes an inner peripheral side wall that overlaps with the extending parts in a rotation direction of the shaft and surrounds the extending parts;
the elastic member is disposed in an unbonded state with respect to at least one of the inner hub and the outer hub between the outer peripheral side of the inner hub and the inner peripheral side of the outer hub;
the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other at a facing part, the facing part having a first facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other in the rotation direction of the shaft, and
a second facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub do not face each other in the rotation direction of the shaft;
at least a part of the elastic member disposed at the second facing part is in contact with an inner peripheral face of the outer hub and an outer peripheral face of the inner hub;
and
a clearance is formed between at least a part of the elastic member disposed at the first facing part and at least one of the inner peripheral face of the outer hub and the outer peripheral face of the inner hub.

11 more elements

A power transmission device that transmits a rotary driving force output from a driving source to a driving target device, the power transmission device comprising:

an electromagnet that generates an electromagnetic attraction force by energization;
a rotor that rotates by the rotary driving force;
an armature that is coupled to the rotor to rotate integrally with the rotor when the electromagnet is energized and detached from the rotor when the electromagnet is not energized;
and
a hub that couples the armature to a shaft of the driving target device, wherein:
the hub includes an outer hub coupled to the armature, an inner hub coupled to the shaft, and an elastic member interposed between the outer hub and the inner hub;
an outer peripheral side of the inner hub includes a plurality of extending parts each extending outward in a radial direction of the shaft;
an inner peripheral side of the outer hub includes an inner peripheral side wall that overlaps with the extending parts in a rotation direction of the shaft and surrounds the extending parts;
the elastic member is disposed in an unbonded state with respect to at least one of the inner hub and the outer hub between the outer peripheral side of the inner hub and the inner peripheral side of the outer hub;
the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other at a facing part, the facing part having
a first facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other in the rotation direction of the shaft, and
a second facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub do not face each other in the rotation direction of the shaft,
at least a part of the elastic member in the second facing part is in contact with an inner peripheral face of the outer hub and an outer peripheral face of the inner hub, and
at least a part of the elastic member in the first facing part has a resistance reducer to reduce a frictional resistance produced against at least one of the inner peripheral face of the outer hub and the outer peripheral face of the inner hub.

11 more elements

A power transmission device that transmits a rotary driving force output from a driving source to a driving target device, the power transmission device comprising:

an electromagnet that generates an electromagnetic attraction force by energization;
a rotor that rotates by the rotary driving force;
an armature that is coupled to the rotor to rotate integrally with the rotor when the electromagnet is energized and detached from the rotor when the electromagnet is not energized;
and
a hub that couples the armature to a shaft of the driving target device, wherein:
the hub includes an outer hub coupled to the armature, an inner hub coupled to the shaft, and an elastic member interposed between the outer hub and the inner hub;
an outer peripheral side of the inner hub includes a plurality of extending parts each extending outward in a radial direction of the shaft;
an inner peripheral side of the outer hub includes an inner peripheral side wall that overlaps with the extending parts in a rotation direction of the shaft and surrounds the extending parts;
the elastic member is disposed in an unbonded state with respect to at least one of the inner hub and the outer hub between the outer peripheral side of the inner hub and the inner peripheral side of the outer hub;
the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other at a facing part, the facing part having
a first facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub face each other in the rotation direction of the shaft, and
a second facing part where the inner peripheral side of the outer hub and the outer peripheral side of the inner hub do not face each other in the rotation direction of the shaft,
at least a part of the elastic member in the second facing part is configured to abut on the inner peripheral side of the outer hub and the outer peripheral side of the inner hub, and
at least a part of the first facing part has a resistance reducer to reduce a frictional resistance produced against the elastic member.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/295,324Filed 7 Mar 2019 · continuation
Priority: JP 2016-21974610 Nov 2016
Published: US 2019/0203776 A14 Jul 2019
Granted: 1 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16D 3/68
Comprising elastic elements arranged between substantially-radial walls of both coupling parts: the elements being made of rubber or similar material
F16D 27/112
With axially movable clutching members: with flat friction surfaces, e.g. discs
F16H 55/36
Friction members: pulleys
F16H 2055/366
Pulleys: with means providing resilience or vibration damping