Damper device

Patent metadata

Field	Value
Publication number	US-9784384-B2
Application number	US-201615168744-A
Country	US
Kind code	B2
Filing date	May 31, 2016
Priority date	May 29, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A damper device may include a baffle to open/close an opening part; a motor; and a gear train connecting the motor and the baffle and including a partially toothless gear and a sector gear. The partially toothless gear may include an outer peripheral part so as to have an outer peripheral face curved along a tooth tip circle of the teeth part. The outer peripheral part may include an end face at a midway position of the teeth part in the axial line direction where a length in the axial line direction is shorter than a tooth width of the teeth part. The sector gear may include a first tooth cut out facing the outer peripheral face and configured to enter in to an inner peripheral side of the tooth tip circle. A second tooth disposed adjacent to the first tooth and configured to abut the outer peripheral face.

First claim

What is claimed is:

1. A damper device comprising;
a baffle configured to open and close an opening part;
a motor; and
a gear train structured to transmit rotation of the motor to the baffle, the gear train comprising a partially toothless gear and a sector gear configured to engage with the partially toothless gear and driven by the partially toothless gear;
wherein the partially toothless gear comprises an outer peripheral part at a portion adjacent to a teeth part in a circumferential direction so as to have an outer peripheral face curved along a tooth tip circle of the teeth part on an outer peripheral side relative to the tooth tip circle;
wherein the outer peripheral part comprises an end face directed to one side in an axial line direction at a midway position of the teeth part in the axial line direction where a length in the axial line direction is shorter than a tooth width of the teeth part;
wherein the sector gear comprises;
a first tooth which is cut out at a portion facing the outer peripheral face and is configured to enter to an inner peripheral side of the tooth tip circle on one side in the axial line direction of the end face; and
a second tooth which is disposed so as to be adjacent to the first tooth and is configured to abut with the outer peripheral face when the first tooth is entered to the inner peripheral side of the tooth tip circle.

2. The damper device according to claim 1 , wherein the outer peripheral face of the outer peripheral part is continuously connected with a first tooth face located on an opposite side to the outer peripheral part of a tooth on the most outer peripheral part side of the teeth part without a step through a curved face.

3. The damper device according to claim 1 , wherein
the sector gear comprises an output shaft which is coaxially protruded to one side or the other side in the axial line direction, and
the baffle is connected with the output shaft.

4. The damper device according to claim 3 , wherein
when the baffle is located at a closed position where the opening part is closed,
the first tooth is entered to the inner peripheral side of the tooth tip circle on one side in the axial line direction of the end face of the outer peripheral part, and
the second tooth is abutted with the outer peripheral face to prevent the sector gear from turning in an opening direction of the baffle.

5. The damper device according to claim 4 , further comprising a frame comprising the opening part,
wherein the baffle comprises an elastic member which is configured to close the opening part, and
wherein the elastic member is abutted with an opening edge of the opening part of the frame and is elastically deformed when the baffle is located at the closed position.

6. The damper device according to claim 1 , wherein when the first tooth is entered to the inner peripheral side of the tooth tip circle, the second tooth is abutted with the outer peripheral face at a position on an outer peripheral side relative to the tooth tip circle.

7. The damper device according to claim 6 , wherein
the partially toothless gear is integrally provided with a large diameter gear to which rotation of the motor is transmitted on one side in the axial line direction of the large diameter gear,
the sector gear comprises an output shaft which is coaxially protruded to one side or the other side in the axial line direction,
the baffle is connected with the output shaft,
when the baffle is located at the closed position where the opening part is closed, the first tooth is entered to the inner peripheral side of the tooth tip circle on one side in the axial line direction of the end face of the outer peripheral part, the second tooth is abutted with the outer peripheral face at a position on an outer peripheral side relative to the tooth tip circle, and the sector gear is prevented from turning in a direction for opening the baffle.

8. The damper device according to claim 7 , further comprising a frame comprising the opening part,
wherein the baffle comprises an elastic member which is configured to close the opening part, and
wherein the baffle is stopped at the closed position in a state that the elastic member is abutted with an opening edge of the opening part of the frame and is elastically deformed.

9. The damper device according to claim 8 , further comprising a case which accommodates the motor and the gear train structured to transmit rotation of the motor to the baffle,
wherein the sector gear comprises:
a shaft part;
the output shaft;
a column part provided between the shaft part and the output shaft; and
a circular arc part comprising a plurality of teeth including the first tooth and the second tooth along its outer peripheral face on an outer peripheral side of the column part;

wherein the case comprises a tube part into which the shaft part is inserted for turnably supporting the sector gear, and
wherein the output shaft is connected with the baffle and the shaft part is inserted into the tube part and thereby the sector gear is held turnably.

10. The damper device according to claim 8 , wherein
the baffle comprises:
an opening and closing plate comprising a flat plate part which is larger than the opening part; and
the elastic member which is stuck on a face on an opening part side of the flat plate part;

when the baffle is located at the closed position where the opening part is closed, the sector gear is prevented from turning in an opening direction of the baffle by the second tooth abutted with the outer peripheral face against shape restoring force of the elastic member which is elastically deformed.

11. The damper device according to claim 6 , wherein the outer peripheral face of the outer peripheral part is continuously connected with a first tooth face located on an opposite side to the outer peripheral part of a tooth on the most outer peripheral part side of the teeth part without a step through a curved face.

12. The damper device according to claim 11 , wherein
the partially toothless gear is integrally provided with a large diameter gear to which rotation of the motor is transmitted on one side in the axial line direction of the large diameter gear,
the sector gear comprises an output shaft which is coaxially protruded to one side or the other side in the axial line direction,
the baffle is connected with the output shaft,
when the baffle is located at the closed position where the baffle closes the opening part, the first tooth is entered to the inner peripheral side of the tooth tip circle on one side in the axial line direction of the end face of the outer peripheral part, the second tooth is abutted with the outer peripheral face at a position on an outer peripheral side relative to the tooth tip circle, and the sector gear is prevented from turning in a direction for opening the baffle.

13. The damper device according to claim 12 , further comprising a case which accommodates the motor and the gear train structured to transmit rotation of the motor to the baffle,
wherein the sector gear comprises:
a shaft part;
the output shaft;
a column part provided between the shaft part and the output shaft; and
a circular arc part comprising a plurality of teeth including the first tooth and the second tooth along its outer peripheral face on an outer peripheral side of the column part;

wherein the case comprises a tube part into which the shaft part is inserted for turnably supporting the sector gear, and
wherein the output shaft is connected with the baffle and the shaft part is inserted into the tube part and thereby the sector gear is held turnably.

Assignees

• Nidec Sankyo Corp

Inventors

• Noritake Seiichiro
• Saito Shunji

Classifications

• F25D2201/30

  with respect to sound · CPC title

• F16K1/2007

  specially adapted operating means therefor (operating means per se F16K31/00) · CPC title

• F16K31/043

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

• F25D17/04

  for circulating air, e.g. by convection · CPC title

• F16K31/535 Primary

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