Drive device having drive transmission device

Patent metadata

Field	Value
Publication number	US-11824419-B2
Application number	US-202217828771-A
Country	US
Kind code	B2
Filing date	May 31, 2022
Priority date	Dec 6, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A drive transmission device includes a drive-side rotatable body, a plurality of magnetic conducting portions and a driven-side rotatable body. The drive-side rotatable body includes a plurality of magnetic poles arranged in a rotational direction. The magnetic conducting portions are magnetizable by the magnetic poles of the drive-side rotatable body. The driven-side rotatable body has a plurality of magnetic poles configured to be rotated in response to rotation of the magnetic poles of the drive-side rotatable body through the magnetic conducting portions. The drive transmission device is configured to be operated as a magnetic speed changer that changes a speed of rotation between the drive-side rotatable body and the driven-side rotatable body by differently setting the number of the magnetic poles of the drive-side rotatable body, the number of the magnetic conducting portions and the number of the magnetic poles of the driven-side rotatable body from each other.

First claim

What is claimed is:

1. A drive device comprising:
an electric motor that is configured to be rotated;
a drive transmission device that is configured to transmit a rotational drive force from the electric motor serving as a drive side to a driven side and is configured to operate as both:
a magnetic coupler, which is configured to implement contactless magnetic coupling between a drive-side rotatable body and a driven-side rotatable body through a partition wall member; and
a speed changer, which is configured to change a speed of rotation to be transmitted to a driven object, wherein the drive transmission device includes:

the drive-side rotatable body that has a plurality of magnetic poles arranged in a rotational direction of the drive-side rotatable body;
a plurality of magnetic conducting portions that are arranged in the rotational direction and are magnetically separated from each other, wherein the plurality of magnetic conducting portions are magnetizable by the plurality of magnetic poles of the drive-side rotatable body; and
the driven-side rotatable body that has a plurality of magnetic poles arranged in the rotational direction, wherein the driven-side rotatable body is configured to be rotated in response to rotation of the plurality of magnetic poles of the drive-side rotatable body through the plurality of magnetic conducting portions, wherein:
a number of the plurality of magnetic poles of the drive-side rotatable body, a number of the plurality of magnetic conducting portions and a number of the plurality of magnetic poles of the driven-side rotatable body are set to be different from each other, and thereby the drive transmission device is also configured to operate as a magnetic speed changer that is configured to change the speed of the rotation between the drive-side rotatable body and the driven-side rotatable body;
the plurality of magnetic conducting portions are integrated in the partition wall member;
the drive-side rotatable body, the plurality of magnetic conducting portions and the driven-side rotatable body are arranged to oppose each other in an axial direction;
the partition wall member has a recessed segment that is formed at a portion of the partition wall member;
the plurality of magnetic conducting portions are provided at a bottom surface portion of the recessed segment of the partition wall member;
the recessed segment of the partition wall member has the bottom surface portion and a peripheral surface portion;
each of the plurality of magnetic conducting portions has:
a conducting section, which is located at the bottom surface portion of the recessed segment and performs substantial magnetic conduction; and
a peripheral wall section, which is bent substantially at a right angle relative to the conducting section and is located at the peripheral surface portion; and

a curvature of a bent portion, which is located between the bottom surface portion and the peripheral surface portion at the recessed segment of the partition wall member, is larger than a curvature of a bent section, which is located between the conducting section and the peripheral wall section at each of the plurality of magnetic conducting portions.

2. The drive device according to claim 1 , wherein:
the partition wall member has a plurality of recesses or a plurality of through-holes;
the plurality of magnetic conducting portions are formed as a plurality of magnetic conductors made of a magnetic metal material; and
the plurality of magnetic conductors are installed in the plurality of recesses or the plurality of through-holes, respectively.

3. The drive device according to claim 1 , wherein:
the partition wall member has a plurality of recesses or a plurality of through-holes; and
the plurality of magnetic conducting portions are formed as a plurality of magnetic conductors that are made of a magnetic metal material and are directly molded in the plurality of recesses or the plurality of through-holes, respectively.

4. The drive device according to claim 3 , wherein:
the partition wall member has the plurality of through-holes;
the plurality of magnetic conductors are installed in the plurality of through-holes, respectively; and
the partition wall member includes a cover member that is installed to the partition wall member to at least close the plurality of through-holes.

5. The drive device according to claim 1 , wherein:
the plurality of magnetic conducting portions are formed as a plurality of magnetic conductors made of a magnetic metal material; and
the partition wall member is made of a non-magnetic resin material and is molded relative to the plurality of magnetic conductors.

6. The drive device according to claim 2 , wherein the plurality of magnetic conductors are formed integrally in one-piece while each adjacent two of the plurality of magnetic conductors are joined together by a connecting portion.

7. The drive device according to claim 2 , wherein the partition wall member has a recess which is shaped in a curved surface form and is located around a stress concentrating area of each of the plurality of magnetic conducting portions.

8. The drive device according to claim 1 , wherein:
the partition wall member has a peripheral plate portion that is used to fix the partition wall member relative to a fixation-subject member; and
each of the plurality of magnetic conducting portions has an extension that extends into the peripheral plate portion.

9. The drive device according to claim 8 , wherein:
each of the plurality of magnetic conducting portions has a fitting portion that is formed at the extension; and
the partition wall member is fitted to the fixation-subject member through the fitting portion of each of the plurality of magnetic conducting portions.

10. The drive device according to claim 1 , wherein:
corresponding two of the plurality of magnetic conducting portions, which are shifted relative to each other by an electrical angle of 360 degrees, are joined together by a connecting portion to increase a strength of the partition wall member.

11. The drive device according to claim 10 , wherein the partition wall member is supported by a support portion, which is provided to one of the partition wall member and a peripheral member placed around the partition wall member, to limit deformation of the partition wall member.

12. The drive device according to claim 11 , wherein a portion of the partition wall member, at which the connecting portion is placed, is supported by the support portion, which is provided to the peripheral member.

13. The drive device according to claim 1 , wherein each adjacent two of the plurality of magnetic conducting portions have two opposing surfaces, respectively, which are opposed to each other, and a portion of each of the two opposing surfaces is cut to form a cutout.

14. The drive device according to claim 1 , wherein:
the partition wall member is made of a material that has a property which is changeable between a magnetic phase and a non-magnetic phase upon application of heat or stress to the material; and
each of the plurality of magnetic conducting portions is formed as a magnetic conducting part of the partition wall member by changing the property of a corresponding part of the partition wall member.

15. A drive device comprising:
an electric motor that is configured to be rotated;
a drive transmission device that is configured to transmit a rotational drive force from the electric motor serving as a drive side to a driven side and is configured to operate as both:
a magnetic coupler, which is configur

Assignees

• Denso Corp

Inventors

• Kawada Shinji
• Nakajima Toshihisa
• SEN Shin

Classifications

• H02K49/102 Primary

  Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact (magnetized gearings with physical contact F16H13/12, F16H49/005) · CPC title

• H02K7/11

  with dynamo-electric clutches · CPC title

• H02K49/108 Primary

  with an axial air gap · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• F16H49/00

  Other gearings · CPC title