Rotary drive device

Patent metadata

Field	Value
Publication number	US-12247643-B2
Application number	US-202117217649-A
Country	US
Kind code	B2
Filing date	Mar 30, 2021
Priority date	Mar 31, 2020
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A rotary drive device includes a pair of drive force transmissions, a pair of decelerators, a pair of carriers, and at least one coupler. Driving rollers are included in the pair of drive force transmissions. Driving rollers transmit drive force to a main wheel. The main wheel includes driven rollers. The pair of drive force transmissions are rotatable about a rotation axis. The pair of carriers accommodate at least a portion of the decelerators. The pair of carriers oppose each other in an axial direction along the rotation axis. The pair of carriers include a first carrier and a second carrier that are directly or indirectly coupled by the at least one coupler.

First claim

What is claimed is:

1. A rotary drive device, comprising:
a pair of drive force transmissions in which a plurality of driving rollers transmitting drive force to a main wheel including a plurality of driven rollers are provided, the drive force transmissions being rotatable about a rotation axis;
a pair of decelerators to decelerate a rotation speed of an input shaft and rotating the drive force transmission at a decelerated rotation speed;
a pair of carriers accommodating at least a portion of the decelerator and opposing each other in an axial direction along the rotation axis; and
at least one coupler; wherein
the pair of carriers include a first carrier and a second carrier;
the first carrier and the second carrier are directly coupled by the at least one coupler;
the first carrier includes a through hole into which the at least one coupler can be inserted;
the second carrier includes a screw hole into which the at least one coupler can be threaded;
the through hole and the screw hole are positioned at positions opposing each other in the axial direction; and
the at least one coupler includes a coupler which penetrates through portions of both the first carrier and the second carrier.

2. The rotary drive device according to claim 1 ; wherein
the at least one coupler includes multiple couplers;
the first carrier and the second carrier each include at least the one through hole and at least the one screw hole;
when viewed from the axial direction in the first carrier, the at least the one through hole is point-symmetric with respect to the at least the one screw hole about the rotation axis; and
when viewed from the axial direction in the second carrier, the at least the one through hole is point-symmetric with respect to the at least the one screw hole about the rotation axis.

3. The rotary drive device according to claim 1 , further comprising a centering support making shaft cores of the pair of carriers coaxial.

4. The rotary drive device according to claim 3 , further comprising:
a first bearing; and
a second bearing; wherein
the pair of drive force transmissions include a first drive force transmission and a second drive force transmission;
the first bearing is attached to the first carrier and rotatably supports the first drive force transmission;
the second bearing is attached to the second carrier and rotatably supports the second drive force transmission; and
the centering support is held between the first bearing and the second bearing in the axial direction.

5. The rotary drive device according to claim 4 , further comprising an adjuster between at least one of the first bearing and the second bearing and the centering support.

6. The rotary drive device according to claim 4 , wherein
the first bearing includes an inner circumferential portion and an outer circumferential portion;
the second bearing includes an inner circumferential portion and an outer circumferential portion; and
the centering support contacts the inner circumferential portion of the first bearing and the inner circumferential portion of the second bearing.

7. A rotary drive device, comprising:
a pair of drive force transmissions in which a plurality of driving rollers transmitting drive force to a main wheel including a plurality of driven rollers are provided, the drive force transmissions being rotatable about a rotation axis;
a pair of decelerators to decelerate a rotation speed of an input shaft and rotating the drive force transmission at a decelerated rotation speed;
a pair of carriers accommodating at least a portion of the decelerator and opposing each other in an axial direction along the rotation axis;
at least one coupler; and
a centering support making shaft cores of the pair of carriers coaxial; wherein
the pair of carriers include a first carrier and a second carrier;
the first carrier and the second carrier are directly or indirectly coupled by the at least one coupler;
the first carrier is coupled with the centering support by the at least one coupler; and
the second carrier is coupled with the centering support by the at least one coupler.

8. The rotary drive device according to claim 7 , wherein
the centering support is annular;
the centering support includes an inner circumferential surface and an outer circumferential surface;
the first carrier includes:
a first body portion; and
a first protrusion portion protruding from the first body portion to the second carrier side;
the second carrier includes:
a second body portion; and
a second protrusion portion protruding from the second body portion to the first carrier side;
the first protrusion portion and the second protrusion portion oppose each other; and
the inner circumferential surface of the centering support contacts the first protrusion portion and the second protrusion portion.

9. The rotary drive device according to claim 8 , further comprising a seal in a space defined by an inner circumferential surface of the centering support, the first protrusion portion, and the second protrusion portion.

10. The rotary drive device according to claim 7 , further comprising:
a first bearing; and
a second bearing; wherein
the pair of drive force transmissions include a first drive force transmission and a second drive force transmission;
the first bearing is attached to the first carrier and rotatably supports the first drive force transmission;
the second bearing is attached to the second carrier and rotatably supports the second drive force transmission; and
the centering support is held between the first bearing and the second bearing in the axial direction.

11. The rotary drive device according to claim 10 , further comprising an adjuster between at least one of the first bearing and the second bearing and the centering support.

12. The rotary drive device according to claim 10 , wherein
the first bearing includes an inner circumferential portion and an outer circumferential portion;
the second bearing includes an inner circumferential portion and an outer circumferential portion; and
the centering support contacts the inner circumferential portion of the first bearing and the inner circumferential portion of the second bearing.

Assignees

• Nidec Shimpo Corp
• Honda Motor Co Ltd

Inventors

• Tsubone Taihei
• HAIZUMI Kyohei
• Mori Kazuki
• Yada Wataru

Classifications

• B62K1/00

  Unicycles · CPC title

• B60K17/043

  Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel · CPC title

• B60K2007/0092

  the motor axle being coaxial to the wheel axle · CPC title

• B60K2007/003

  with two or more motors driving a single wheel · CPC title

• B60K7/0007

  the motor being electric · CPC title