Rotary actuator

Patent metadata

Field	Value
Publication number	US-9303728-B2
Application number	US-201313767177-A
Country	US
Kind code	B2
Filing date	Feb 14, 2013
Priority date	Feb 17, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A rotary actuator includes a rotation shaft rotatably driven by a motor, an internal gear provided on an outer side of the rotation shaft in a radial direction of the rotation shaft, a rotation output section provided between the rotation shaft and the internal gear in the radial direction to reduce a rotation speed outputted from the rotation shaft and to output a power in conjunction with the internal gear, a cylindrical housing portion fixed to the internal gear, and an attachment member integrated with an outer wall of the housing portion. The internal gear has a protrusion protruding from an outer wall of the internal gear, and the housing portion has a recess into which the protrusion is inserted. The attachment member has an attachment hole that is different from the recess in position in a circumferential direction of the housing portion.

First claim

What is claimed is:

1. A rotary actuator comprising:
a motor;
a rotation shaft rotatably driven by the motor;
an internal gear incapable of rotating, provided on an outer side of the rotation shaft in a radial direction of the rotation shaft;
a rotation output section provided between the rotation shaft and the internal gear in the radial direction to reduce a rotation speed outputted from the rotation shaft and to output a power in conjunction with the internal gear;
a housing portion having a cylindrical shape, and fixed to the internal gear located on an inner side of the housing portion in the radial direction; and
an attachment member integrated with an outer wall of the housing portion, wherein
the internal gear has a protrusion protruding from an outer wall of the internal gear,
the housing portion has a recess into which the protrusion is inserted,
the attachment member has an attachment hole that is different from the recess in position in a circumferential direction of the housing portion,
the attachment hole is separated from the recess in the circumferential direction, and
the housing portion does not have a recess that overlaps the attachment hole in the radial direction and into which the protrusion is inserted.

2. The rotary actuator according to claim 1 , wherein
the rotation output section includes:
an eccentric shaft provided eccentrically with respect to a rotation axis of the rotation shaft, and rotating integrally with the rotation shaft;
an external gear supported rotatably by the eccentric shaft, the external gear engaging with the internal gear to revolve around the rotation axis of the rotation shaft with rotating on a rotation axis of the eccentric shaft when the rotation shaft rotates; and
an output member arranged coaxially with the rotation shaft such that the rotation of the external gear is transmitted to the output member.

3. The rotary actuator according to claim 1 , wherein
the rotation output section includes:
a sun gear which rotates integrally with the rotation shaft;
a planetary gear engaging with the internal gear and the sun gear to revolve around a rotation axis of the rotation shaft with rotating when the rotation shaft rotates; and
a planetary carrier arranged coaxially with the rotation shaft, the planetary carrier supporting the planetary gear rotatably such that the revolution of the planetary gear is transmitted to the planetary carrier.

4. The rotary actuator according to claim 1 , further comprising a metallic collar fixed to an inner wall of the attachment hole.

5. The rotary actuator according to claim 1 , wherein the attachment hole is provided at three positions of the housing portion and arranged at regular intervals in the circumferential direction.

6. The rotary actuator according to claim 5 , wherein
the internal gear has a plurality of protrusions protruding from the outer wall of the internal gear,
the housing portion has a plurality of recesses into which the plurality of protrusions are inserted respectively, and
the attachment holes are different from the plurality of recesses in position in the circumferential direction of the housing portion.

Assignees

• Denso Corp

Inventors

• Kume Mikine
• Nakayama Seiji
• Itoh Taku

Classifications

• F16H2057/02034

  Gearboxes combined or connected with electric machines · CPC title

• F16H2055/176

  Ring gears with inner teeth · CPC title

• F16H57/023 Primary

  Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly · CPC title

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• H02K7/116

  with gears · CPC title