Rotary drive device

Patent metadata

Field	Value
Publication number	US-12049103-B2
Application number	US-202117217641-A
Country	US
Kind code	B2
Filing date	Mar 30, 2021
Priority date	Mar 31, 2020
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A rotary drive device in a mobile body includes a main wheel and a pair of drive assemblies opposing each other and each driving the main wheel. The main wheel includes driven rollers. One of the pair of drive assemblies includes a motor, a motor case, a drive force transmission, and driving rollers. The driving rollers are in the drive force transmission along a circumferential direction, and contact at least a portion of the driven rollers from one side of the rotary drive device of the axial direction. The drive force transmission rotates to transmit a drive force of the motor to the main wheel via the driving rollers. At least a portion of the motor case opposes at least a portion of the driving rollers in the axial direction.

First claim

What is claimed is:

1. A rotary drive device provided on a mobile body, the rotary drive device comprising:
a main wheel rotatable about a rotation axis; and
a pair of drive assemblies opposing each other in an axial direction along the rotation axis, each of the pair of drive assemblies drives the main wheel; wherein
the main wheel includes a plurality of driven rollers along a circumferential direction relative to the rotation axis;
a first drive assembly, which is one of the pair of drive assemblies, includes:
a first motor;
a first motor case accommodating the first motor;
a first drive force transmission rotating about the rotation axis; and
a plurality of first driving rollers in the first drive force transmission along the circumferential direction and contacting at least a portion of the plurality of driven rollers from one side of the rotary drive device in the axial direction;
the first drive force transmission rotates to transmit drive force of the first motor to the main wheel via the plurality of first driving rollers;
at least a portion of the first motor case opposes at least a portion of the plurality of first driving rollers in the axial direction;
the at least the portion of the first motor case is attachable to a mobile body main body of the mobile body;
a second drive assembly, which is another one of the pair of drive assemblies, includes:
a second motor;
a second motor case accommodating the second motor;
a second drive force transmission rotating about the rotation axis; and
a plurality of second driving rollers in the second drive force transmission along the circumferential direction and coming into contact with at least a portion of the plurality of driven rollers from an other side in the axial direction;
the second drive force transmission rotates to transmit drive force of the second motor to the main wheel via the plurality of second driving rollers;
at least a portion of the second motor case opposes at least a portion of the plurality of second drive rollers in the axial direction;
at least one of the at least a portion of the first motor case and the at least a portion of the second motor case is attachable to the mobile body main body;
the first drive assembly further includes a first decelerator on a load side of the first motor case in the axial direction to decelerate a rotation speed of an output shaft of the first motor;
the at least a portion of the first motor case is a front bracket connected to the first decelerator;
the second drive assembly further includes a second decelerator on a load side of the second drive assembly in the axial direction with respect to the second motor case to decelerate a rotation speed of an output shaft of the second motor; and
the at least a portion of the second motor case is a front bracket connected to the second decelerator.

2. The rotary drive device according to claim 1 , wherein both the at least a portion of the first motor case and the at least a portion of the second motor case are attachable to the mobile body main body.

3. The rotary drive device according to claim 1 , wherein
the at least a portion of the first motor case is positioned on a load side of the first motor case in the axial direction relative to a center portion of the first motor case between an end surface of an anti-load side of the first motor case and an end surface of the load side of the first motor case; and
the at least a portion of the second motor case is positioned on a load side of the second motor case in the axial direction relative to a center portion of the second motor case between an end surface of an anti-load side of the second motor case and an end surface of the load side of the second motor case.

4. The rotary drive device according to claim 1 , wherein
the first motor case has a cylindrical shape extending in the axial direction;
the at least a portion of the first motor case overlaps, along the axial direction, a recessed region recessed radially inward with respect to the rotational axis;
the second motor case includes a cylindrical shape extending in the axial direction; and
the at least a portion of the second motor case overlaps, along the axial direction, another recessed region recessed radially inward with respect to the rotational axis.

5. The rotary drive device according to claim 1 , wherein
the first motor case includes:
a first body portion accommodating the first motor; and
a first flange portion projecting from the first body portion radially outward with respect to the rotation axis;
the at least a portion of the first motor case defines the first flange portion;
the second motor case includes:
a second body portion accommodating the second motor; and
a second flange portion projecting from the second body portion radially outward with respect to the rotation axis; and
the at least a portion of the second motor case defines the second flange portion.

6. A rotary drive device provided on a mobile body, the rotary drive device comprising:
a main wheel rotatable about a rotation axis; and
a pair of drive assemblies opposing each other in an axial direction along the rotation axis, each of the pair of drive assemblies drives the main wheel; wherein
the main wheel includes a plurality of driven rollers along a circumferential direction relative to the rotation axis;
a first drive assembly, which is one of the pair of drive assemblies, includes:
a first motor;
a first motor case accommodating the first motor;
a first drive force transmission rotating about the rotation axis; and
a plurality of first driving rollers in the first drive force transmission along the circumferential direction and contacting at least a portion of the plurality of driven rollers from one side of the rotary drive device in the axial direction;
the first drive force transmission rotates to transmit drive force of the first motor to the main wheel via the plurality of first driving rollers;
at least a portion of the first motor case opposes at least a portion of the plurality of first driving rollers in the axial direction;
the at least the portion of the first motor case is attachable to a mobile body main body of the mobile body;
a second drive assembly, which is another one of the pair of drive assemblies, includes:
a second motor;
a second motor case accommodating the second motor;
a second drive force transmission rotating about the rotation axis; and
a plurality of second driving rollers in the second drive force transmission along the circumferential direction and coming into contact with at least a portion of the plurality of driven rollers from an other side in the axial direction;
the second drive force transmission rotates to transmit drive force of the second motor to the main wheel via the plurality of second driving rollers;
at least a portion of the second motor case opposes at least a portion of the plurality of second drive rollers in the axial direction;
at least one of the at least a portion of the first motor case and the at least a portion of the second motor case is attachable to the mobile body main body;
the first motor case includes:
a first body portion accommodating the first motor; and
a first flange portion projecting from the first body portion radially outward with respect to the rotation axis;
the at least a portion of the first motor case defines the first flange portion;
the second motor case includes:
a second body portion accommodating the second motor; and
a second flange portion projecting from the second body portion radially outward with respect to the rotation axis; and
the at least a portion of the second motor case defines the second flange portion;
the first flange portion includes:
a first attachment

Assignees

• Nidec Shimpo Corp
• Honda Motor Co Ltd

Inventors

• Tsubone Taihei
• HAIZUMI Kyohei
• Yada Wataru
• Sakamoto Tomokazu
• Echizenya Takeshi
• Kato Seiji

Classifications

• B60B19/125

  with helical projections on radial outer surface translating rotation of wheel into movement along the direction of the wheel axle · CPC title

• B60Y2200/62

  Conveyors, floor conveyors · CPC title

• B60K2007/0092

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

• B60K2007/0038

  the motor moving together with the wheel axle · CPC title

• B60K7/0007

  the motor being electric · CPC title