US 8,127,898 B2Granted

Brake device and motor with speed reducing mechanism

AssigneeAsmo Co., Ltd.

InventorsHiroaki Yamamoto, Katsuhiko Torii, Hidenori Ishihara, Tomoki Yamashita, Nakatsune Shirai, Katsumi Endo

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Abstract

A brake device arranged between a drive shaft and a driven shaft arranged coaxially with the drive shaft is disclosed. The brake device includes a first rotor, a second rotor, an engagement member, a braking mechanism, and a cam mechanism. The braking mechanism includes a movable friction member rotatable integrally with the second rotor, a fixed friction portion, and an urging member that urges the movable friction member toward the fixed friction portion. When rotational force is provided from the drive shaft to the first rotor, the cam mechanism permits transmission of rotation of the drive shaft to the driven shaft. When the rotational force is provided from the driven shaft to the second rotor, the cam mechanism restricts rotation of the driven shaft. The cam mechanism is provided independently from the engagement member.

Claims18

Dependent claims

A brake device provided between a drive shaft and a driven shaft arranged coaxially with the drive shaft, the device comprising:

a first rotor provided in a manner rotatable integrally with the drive shaft and having a plurality of engagement portions;
a second rotor arranged in a manner rotatable integrally with the driven shaft and having a plurality of engagement portions
wherein the engagement portions of the first rotor and the engagement options of the second rotor are engaged with each other in a rotational direction of the first and second rotors and causes engagement between the first rotor and the second rotor in such a manner as to allow transmission of rotation;
a braking mechanism including a movable friction member rotatable integrally with the second rotor, a fixed friction portion, and an urging member that urges the movable friction member toward the fixed friction portion, wherein the movable friction member is movable between an engagement position at which the movable friction member contacts and is engaged with the fixed friction portion and a non-engagement position at which the movable friction member is separated from the fixed friction portion;
and
a cam mechanism that moves the movable friction member between the engagement position and the non-engagement position, wherein, when rotational force is provided from the drive shaft to the first rotor, the cam mechanism moves the movable friction member from the engagement position to the non-engagement position so as to allow transmission of the rotation of the drive shaft to the driven shaft through the first rotor and the second rotor, and wherein, when the rotational force is provided from the driven shaft to the second rotor, the cam mechanism maintains the movable friction member at the engagement position so as to restrict the rotation of the driven shaft,
wherein the cam mechanism is provided independently from the engagement portions.

4 more elements

A motor with a speed reducing mechanism, comprising:

a motor body having a drive shaft;
a speed reducing portion having a worm shaft arranged coaxially with the drive shaft;
and
a brake device arranged between the drive shaft and the worm shaft, wherein the brake device includes:
a first rotor provided in a manner rotatable integrally with the drive shaft and having a plurality of engagement portions;
a second rotor arranged in a manner rotatable integrally with the driven shaft and having a plurality of engagement portions;
wherein the engagement portions of the first rotor and the engagement portions of the second rotor are engaged with each other in a rotational direction of the first and second rotors and causes engagement between the first rotor and the second rotor in such a manner as to allow transmission of rotation;
a braking mechanism including a movable friction member rotatable integrally with the second rotor, a fixed friction portion, and an urging member that urges the movable friction member toward the fixed friction portion, wherein the movable friction member is movable between an engagement position at which the movable friction member contacts and is engaged with the fixed friction portion and a non-engagement position at which the movable friction member is separated from the fixed friction portion;
and
a cam mechanism that moves the movable friction member between the engagement position and the non-engagement position, wherein, when rotational force is provided from the drive shaft to the first rotor, the cam mechanism moves the movable friction member from the engagement position to the non-engagement position so as to allow transmission of rotation of the drive shaft to the driven shaft through the first rotor and the second rotor, and wherein, when the rotational force is provided from the driven shaft to the second rotor, the cam mechanism maintains the movable friction member at the engagement position so as to restrict the rotation of the driven shaft,
wherein the cam mechanism is provided independently from the engagement portions.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/332,053Filed 10 Dec 2008
Priority: JP 2007-32224813 Dec 2007
Published: US 2009/0152057 A118 Jun 2009
Granted: 6 Mar 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02K 7/102
Structural association with clutches, brakes, gears, pulleys or mechanical starters: with friction brakes
E05F 11/505
Crank gear with clutches or retaining brakes, for operating window mechanisms: for vehicle windows
E05F 15/697
Specially adapted for vehicle windows: motor units therefor, e.g. geared motors
F16D 67/00
Combinations of couplings and brakes