Resistance generating device for drive unit

Patent metadata

Field	Value
Publication number	US-9461532-B2
Application number	US-201414578917-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Jan 31, 2014
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A resistance generating device for a drive unit of an opening and closing member of a vehicle includes a transmission member transmitting a rotary motion to a rotary body, and a fixing member provided to form a clearance between the fixing member and the transmission member in a radial direction of a rotary axis of the transmission member. One of the fixing member and the transmission member includes a magnet and the other includes a magnetic body. The magnet is disposed to face the magnetic body so that the facing position facing each other is changed as the transmission member rotates. The magnet is disposed to face the magnetic body so that magnetic poles at the facing position alternate as the transmission member rotates. The magnetic body and the magnet generate a magnetic force therebetween, the magnetic force generating a resistance against an opening and closing movement of the opening and closing member.

First claim

The invention claimed is:

1. A resistance generating device for a drive unit opening and closing an opening and closing member of a vehicle, comprising:
a rotary body being rotated for opening and closing the opening and closing member;
a transmission member being rotated in response to an applied power, the transmission member transmitting a rotary motion to the rotary body; and
a fixing member provided to form a clearance between the fixing member and the transmission member in a radial direction of a rotary axis of the transmission member, the fixing member surrounding a periphery of the transmission member; wherein
one of the fixing member and the transmission member includes a magnet and the other of the fixing member and the transmission member includes a magnetic body;
the magnet is disposed to face the magnetic body so that a facing position of the magnet and the magnetic body facing each other is changed as the transmission member rotates; the magnet is disposed to face the magnetic body so that magnetic poles at the facing position of the magnet and the magnetic body alternate as the transmission member rotates;
the magnetic body and the magnet generate a magnetic force therebetween, the magnetic force generating a resistance against an opening and closing movement of the opening and closing member; and
the transmission member is connected to a reduction gear and receives a drive force of a motor via the reduction gear.

2. The resistance generating device according to claim 1 , wherein the transmission member includes a plurality of magnetic body portions disposed at an outer peripheral portion of the transmission member, the plurality of magnetic body portions extending in a circumferential direction of the transmission member.

3. The resistance generating device according to claim 2 , wherein the transmission member includes a holding portion which is a non-magnetic body, the holding portion holding the plurality of magnetic body portions.

4. The resistance generating device according to claim 1 , wherein the fixing member is formed in a ring shape, the fixing member is a ring magnet of which magnetic poles alternate in a circumferential direction of the ring magnet.

5. The resistance generating device according to claim 1 , wherein the opening and closing member is a back door of the vehicle and the rotary body is a threaded spindle for opening and closing the back door.

6. A resistance generating device for a drive unit opening and closing an opening and closing member of a vehicle, comprising:
a rotary body being rotated for opening and closing the opening and closing member;
a transmission member being rotated in response to an applied power, the transmission member transmitting a rotary motion to the rotary body; and
a fixing member provided to form a clearance between the fixing member and the transmission member in a radial direction of a rotary axis of the transmission member, the fixing member surrounding a periphery of the transmission member; wherein
one of the fixing member and the transmission member includes a magnet and the other of the fixing member and the transmission member includes a magnetic body;
the magnet is disposed to face the magnetic body so that a facing position of the magnet and the magnetic body facing each other is changed as the transmission member rotates;
the magnet is disposed to face the magnetic body so that magnetic poles at the facing position of the magnet and the magnetic body alternate as the transmission member rotates;
the magnetic body and the magnet generate a magnetic force therebetween, the magnetic force generating a resistance against an opening and closing movement of the opening and closing member;
the transmission member includes a plurality of magnetic body portions disposed at an outer peripheral portion of the transmission member, the plurality of magnetic body portions extending in a circumferential direction of the transmission member;
the transmission member includes a first transmission member and a second transmission member separately provided from each other and disposed in an axial direction of the rotary axis of the transmission member; and
the magnetic body portion provided at the first transmission member is displaced from the magnetic body portion provided at the second transmission member in a rotary direction of the transmission member during a rotation of the transmission member.

Assignees

• Aisin Seiki

Inventors

• Sakai Toshiyuki
• Suzuki Ryusei

Classifications

• H02K49/106 Primary

  with a radial air gap · CPC title

• E05Y2900/546

  Tailboards, tailgates or sideboards opening upwards · CPC title

• H02K2213/09

  Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators · CPC title

• F16D2127/005

  force- or torque-responsive · CPC title

• H02K49/10

  of the permanent-magnet type · CPC title