Planetary gear transmission for a motor and manually operable valve

Patent metadata

Field	Value
Publication number	US-10072772-B2
Application number	US-201615298818-A
Country	US
Kind code	B2
Filing date	Oct 20, 2016
Priority date	Oct 23, 2015
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A setting/operating device including: a sun gear that is rotated by a rotational force from a drive motor; a fixed internal gear fixedly disposed to surround the sun gear and having teeth on an inner peripheral surface; a plurality of planetary gears disposed between the sun gear and the fixed internal gear that rotate in engagement with the sun gear and the fixed internal gear while revolving around the sun gear; a movable internal gear disposed coaxially with the fixed internal gear, having teeth that come into engagement with the planetary gear on an inner peripheral surface, and provided so as to be rotatable; an output shaft coupled to the movable internal gear and configured to rotate the valve stem of the regulating valve; and a manual operation mechanism that rotates the sun gear or the planetary gear by a force applied from the outside of a housing.

First claim

The invention claimed is:

1. A setting/operating device comprising:
a sun gear configured to rotate upon reception of a rotational force from a drive motor;
a fixed internal gear fixedly disposed to surround the sun gear and configured to have teeth on a fixed inner peripheral surface;
a plurality of planetary gears disposed between the sun gear and the fixed internal gear that rotate in engagement with the sun gear and the fixed internal gear while revolving around the sun gear;
a movable internal gear disposed coaxially with the fixed internal gear, said movable internal gear being configured with teeth on a movable inner peripheral surface that come into engagement with the planetary gears and being configured to be rotatable;
an output shaft coupled to the movable internal gear and configured to rotate a valve stem of a regulating valve;
a housing that accommodates the sun gear, the fixed internal gear, the planetary gears, and the movable internal gear;
a manual operation mechanism configured to rotate one of the sun gear and the plurality of planetary gears by an external force, wherein
the manual operation mechanism comprises:
a seat disposed in the movable internal gear, the seat being configured to rotatably support the planetary gears and to be rotatable coaxially with the movable internal gear;
a shaft portion coupled at one end to the seat and having a same axis of rotation as the seat; and
an operating member configured to be operable from an outside of the housing to provide the planetary gears with a rotational force via the shaft portion as the external force,

the operating member is a disc-shaped dial,
the movable internal gear and the output shaft have a same axis of rotation,
the output shaft is formed into a rod shape,
the output shaft comprises one or more cut-away portions each formed by cutting away part of an outer peripheral portion of the output shaft in a respective radial direction and one or more concave portions each formed at a central portion of the output shaft in another respective radial direction, and
the manual operation mechanism is disposed in such a manner that a center of the dial is aligned with a center of the one or more concave portions in a plan view, and one or more parts of an outer peripheral portion of the dial projects from the one or more concave portions toward the one or more cut-away portions in the plan view.

2. A setting/operating device comprising:
a sun gear configured to rotate upon reception of a rotational force from a drive motor;
a fixed internal gear fixedly disposed to surround the sun gear and configured to have teeth on a fixed inner peripheral surface;
a plurality of planetary gears disposed between the sun gear and the fixed internal gear that rotate in engagement with the sun gear and the fixed internal gear while revolving around the sun gear;
a movable internal gear disposed coaxially with the fixed internal gear, said movable internal gear being configured with teeth on a movable inner peripheral surface that come into engagement with the planetary gears and being configured to be rotatable;
an output shaft coupled to the movable internal gear and configured to rotate a valve stem of a regulating valve;
a housing that accommodates the sun gear, the fixed internal gear, the planetary gears, and the movable internal gear; and
a manual operation mechanism comprising a shaft portion coupled at one end to the sun gear and that rotates one of the sun gear and the plurality of planetary gears by an external force and an operating member that is operable from an outside of the housing for exerting a rotational force via the shaft portion as the external force, wherein
the operating member is a disc-shaped dial,
the output shaft comprises one or more cut-away portions each formed by cutting away part of an outer peripheral portion of the output shaft in a respective radial direction and one or more concave portions each formed at a central portion of the output shaft in another respective radial direction, and
a center of the dial is aligned with a center of the one or more concave portions in a plan view, and one or more parts of an outer peripheral portion of the dial projects from the one or more concave portions toward the one or more cut-away portions in the plan view.

3. A setting/operating device comprising:
a sun gear configured to rotate upon reception of a rotational force from a drive motor;
a fixed internal gear fixedly disposed to surround the sun gear and configured to have teeth on a fixed inner peripheral surface;
a plurality of planetary gears disposed between the sun gear and the fixed internal gear that rotate in engagement with the sun gear and the fixed internal gear while revolving around the sun gear;
a movable internal gear disposed coaxially with the fixed internal gear, said movable internal gear being configured with teeth on a movable inner peripheral surface that come into engagement with the planetary gears and being configured to be rotatable;
an output shaft coupled to the movable internal gear and configured to rotate a valve stem of a regulating valve;
a housing that accommodates the sun gear, the fixed internal gear, the planetary gears, and the movable internal gear;
a manual operation mechanism configured to rotate one of the sun gear and the plurality of planetary gears by an external force;
a transmitting mechanism configured to transmit rotation of the movable internal gear to the output shaft, wherein
the movable internal gear and the output shaft are configured away from each other with different axes of rotation,
the movable internal gear comprises a through-hole that penetrates in an axial direction,
the manual operation mechanism has a same axis of rotation as the sun gear and comprises a shaft portion that is coupled at one end to the sun gear and that is exposed at another end to an outside of the housing, and
the shaft portion comprises, at the another end, a hole formed in the axial direction, the hole having a polygonal shape in a plan view.

Assignees

• Azbil Corp

Inventors

• Ohashi Tomofumi

Classifications

• F16K31/043 Primary

  characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means · CPC title

• F16K31/055

  for rotating valves · CPC title

• F16K31/535

  for rotating valves (F16K31/54 takes precedence) · CPC title

• F16K31/53 Primary

  with toothed gearing · CPC title

• F16K31/05

  specially adapted for operating hand-operated valves or for combined motor and hand operation · CPC title