JP2015152215A - damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper device capable of being miniaturized even when influence of backlash between gears in a driving part is restrained by a spring.SOLUTION: In a damper device 1, a baffle 4 takes an open posture, a close posture and an intermediate posture with a driving part 6 having a stepping motor and a reduction gear train. The baffle 4 is energized by a torsion coil spring 9. A winding part 90 of the torsion coil spring 9 is arranged around a second shaft part 462 having an outside diameter smaller than a first shaft part 461 of a shaft part 46 coaxial with a rotation center axis L, and one end 91 is abutted to a frame 2, and the other end 97 is abutted to a surface on a side opposite from an opening 210 of the baffle 4. An outside diameter of the winding part 90 is smaller than that of the first shaft part 461.

Description

  The present invention relates to a damper device used for a cold air passage or the like of a refrigerator.

  For example, a damper device used in a cool air passage of a refrigerator has a structure in which an opening formed in a frame is opened and closed by rotating a baffle by a driving unit having a motor and a reduction gear train (Patent Literature). 1).

  On the other hand, when opening and closing the opening formed in the frame by rotating the baffle with a drive unit equipped with a cam mechanism, a structure is proposed in which a tension coil spring is connected to the baffle and the baffle is biased in the closing direction by the tension coil spring (See Patent Documents 2 and 3).

JP 2007-232237 A JP-A-5-196340 JP-A-9-138052

  However, when the reduction gear train is used for the drive unit as in the configuration described in Patent Document 1, when the baffle is stopped in an intermediate position between the open position and the closed position, the baffle is caused by the backlash between the gears. There is a problem that rotation backlash occurs and the position accuracy of the baffle is low.

  On the other hand, in the case of the configurations described in Patent Documents 2 and 3, since a cam coil mechanism is used, a tension coil spring is connected to the baffle, and this is not a technique for suppressing the influence of backlash between gears. Further, if it is attempted to suppress the influence of backlash between the gears by the tension coil spring, it is necessary to secure a space corresponding to the length of the tension coil spring between the frame and the baffle, so that the damper device is enlarged. There is a point.

  In view of the above problems, an object of the present invention is to provide a damper device that can be reduced in size even when the influence of backlash between gears in a drive unit is suppressed by a spring.

  In order to solve the above problems, a damper device according to the present invention transmits a frame having an opening, a baffle for opening and closing the opening, and rotation of a motor to the baffle via a reduction gear train. And rotating the baffle to switch the position of the baffle to a closed position in which the opening is closed, an open position in which the opening is opened, and an intermediate position between the closed position and the open position; The winding portion is disposed around the rotation center axis of the baffle, and one end extending from the winding portion contacts the frame and the other end extended from the winding portion contacts the baffle. And a torsion coil spring that urges the baffle in one of a closing direction and an opening direction with respect to the opening.

In the present invention, since the baffle is urged by the torsion coil spring, the influence of the backlash between the gears in the drive unit can be suppressed by the spring. The torsion coil spring
Since it is arrange | positioned around the rotation center axis line of a baffle, the space for arrange | positioning a torsion coil spring may be small. Therefore, it is possible to reduce the size of the damper device.

  In the present invention, the baffle includes a shaft portion that projects coaxially with the rotation center axis from one side of the rotation center axis to the other side, and the winding portion is disposed around the shaft portion. It is preferable. According to such a configuration, it is possible to secure a portion where the torsion coil spring is provided with a simple configuration.

  In the present invention, the shaft portion includes a first shaft portion connected to the drive portion on the one side of the rotation center axis, and the winding on the other side of the rotation center axis with respect to the first shaft portion. A second shaft portion located inside the turning portion, wherein the second shaft portion has an outer diameter smaller than that of the first shaft portion, and the first shaft portion includes the second shaft portion. It is preferable that a hole is formed that opens toward the side opposite to the side and into which the output shaft of the drive unit is fitted. According to such a configuration, it is possible to suppress the winding portion of the torsion coil spring from projecting radially outward from the first shaft portion connected to the drive portion, and therefore an extra space around the rotation center axis of the baffle. Does not occur. For this reason, size reduction of a damper apparatus can be achieved.

  In the present invention, the baffle includes a rib extending along an outer edge of the baffle on a surface on which the other end of the torsion coil spring abuts, and when viewed from the rotation center axis direction, the rib is It is preferable that the entire baffle including the shaft portion is located within a range in a thickness direction of a portion excluding the rib. According to this configuration, the baffle can be thinned.

  In this invention, it is preferable that the outer diameter of the said winding part is smaller than the outer diameter of the said 1st axial part. According to such a configuration, since the winding portion of the torsion coil spring does not protrude radially outward from the first shaft portion connected to the driving portion, no extra space is generated around the rotation center axis of the baffle. For this reason, size reduction of a damper apparatus can be achieved.

  In the present invention, in the torsion coil spring, it is preferable that a position of the winding portion on the first shaft portion side is defined by an end surface of the first shaft portion on the second shaft portion side. According to this configuration, the torsion coil spring can be positioned by mounting the winding portion of the torsion coil spring around the second shaft portion.

  In the present invention, it is preferable that at least one of the baffle and the frame is provided with a stopper for preventing the torsion coil spring from moving to the other side. According to this configuration, the torsion coil spring is unlikely to come off the shaft portion.

  In the present invention, when viewed from the axial direction of the rotation center, a portion of the torsion coil spring extending from the winding portion to the other end is located within a range in the thickness direction of the entire baffle including the shaft portion. It is preferable. According to this configuration, even when the baffle is in the open posture, the portion of the torsion coil spring that extends from the winding portion to the other end does not contact the frame.

  In the present invention, it is preferable that the torsion coil spring generates a biasing force in any of the closed position, the open position, and the intermediate position. According to such a configuration, when the damper device is assembled, the torsion coil spring is held between the frame and the baffle simply by mounting the torsion coil spring.

In the present invention, it is preferable that the torsion coil spring is located inside an outer edge of the frame. According to such a configuration, even when the damper device is arranged in a duct or the like, the torsion coil spring does not contact the duct.

  In the present invention, the motor may be a stepping motor, and the torsion coil spring may be configured to bias the baffle in the closing direction.

  In the present invention, it is preferable that the baffle is pressed around the opening by a driving force of the motor. According to such a configuration, the opening can be reliably closed even when the biasing force of the torsion coil spring is small.

  In the present invention, it is preferable that the biasing force that the baffle receives from the torsion coil spring in the intermediate posture is smaller than the stop force that the detent torque of the stepping motor acts on the baffle. According to such a configuration, the baffle is not rotated by the biasing force received from the torsion coil spring in the intermediate posture.

  In the present invention, in the intermediate posture, the force that the baffle tries to rotate by the urging force of the torsion coil spring is the force that the baffle tries to rotate by its own weight and the pressure that the baffle receives from the airflow passing through the opening. It is preferable that the force is larger than the force to rotate. According to this configuration, the baffle is difficult to rotate due to the pressure received from its own weight or airflow.

  In the present invention, in the intermediate posture, the direction in which the baffle tends to rotate due to its own weight and the direction in which the baffle tends to rotate due to the pressure received from the airflow passing through the opening are preferably reversed. According to this configuration, the baffle is difficult to rotate due to the pressure received from its own weight or airflow.

  In the present invention, since the baffle is urged by the torsion coil spring, the influence of the backlash between the gears in the drive unit can be suppressed by the spring. Further, since the torsion coil spring is arranged around the rotation center axis of the baffle, a space for arranging the torsion coil spring may be small. Therefore, it is possible to reduce the size of the damper device.

It is explanatory drawing of the damper apparatus which concerns on Embodiment 1 of this invention. It is the front view which looked at the damper apparatus which concerns on Embodiment 1 of this invention from the side by which the baffle is arrange | positioned with respect to the opening part. It is explanatory drawing of the baffle of the damper apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the drive part of the damper apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the torsion coil spring provided in the damper apparatus which concerns on Embodiment 1 of this invention. It is explanatory drawing of the stopper provided in the damper apparatus which concerns on the modified example of Embodiment 1 of this invention. It is explanatory drawing of the damper apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the torsion coil spring provided in the damper apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, a refrigerator damper device to which the present invention is applied will be described with reference to the drawings. In the following description, the rotation center axis of the baffle 4 is L, the direction along the rotation center axis L is the X direction, the direction in which the opening is facing is the Z direction, and the direction orthogonal to the X direction and the Z direction is Y. This will be described as a direction. Also, one side in the X direction is X1, the other side in the X direction is X2, one side in the Y direction is Y1, the other side in the Y direction is Y2, one side in the Z direction is Z1, and The other side will be described as Z2. Further, the rotation center axis L is assumed to be the horizontal direction, one side Y1 in the Y direction is set to the lower side in the gravity direction, and the other side Y2 in the Y direction is set to the upper side in the gravity direction.

[Embodiment 1]
(overall structure)
FIG. 1 is an explanatory diagram of a damper device 1 according to Embodiment 1 of the present invention. FIG. 1A is a perspective view of the opening 210 viewed from the side opposite to the side where the baffle 4 is disposed. FIG. 1B is a perspective view of the opening 210 viewed from the side where the baffle 4 is disposed. FIG. 2 is a front view of the damper device 1 according to Embodiment 1 of the present invention as viewed from the side where the baffle 4 is disposed with respect to the opening 210.

  As shown in FIGS. 1 and 2, the damper device 1 of the present embodiment includes a frame 2 in which a rectangular opening 210 is formed, and a baffle 4 for opening and closing the opening 210. The frame 2 includes a first frame 21 in which an opening 210 is formed, and a second frame 22 in which the driving unit 6 is disposed. The first frame 21 has a rectangular end plate portion 211 in which an opening 210 is formed, and a rectangular tube-shaped body portion 212 protruding from the outer edge of the end plate portion 211 to the other side Z2 in the Z direction. . In the body portion 212, a portion located on one side X1 in the X direction is a connecting plate portion 215 protruding to the other side Z2 in the Z direction, and the connecting plate portion 215 is connected to the second frame 22. Yes. When the opening 230 and the baffle 5 are disposed on the opposite side of the second frame 22 from the baffle 4, the third frame 23 is disposed on the opposite side of the second frame 22 from the first frame 21. The

  In this embodiment, the drive unit 6 opens and closes the opening 210 by rotating the baffle 4 around the rotation center axis L extending in the Z direction (horizontal direction). The drive unit 6 changes the posture of the baffle 4 to a closed posture (upright posture shown by a solid line 4A) that rotates the baffle 4 in the closing direction shown by an arrow A around the rotation center axis L and closes the opening 210 with the baffle 4. , Between the open posture (horizontal posture shown by the two-dot chain line 4B) in which the baffle 4 is rotated in the opening direction shown by the arrow B around the rotation center axis L and the opening 210 is opened, and between the closed posture and the open posture Switching to the intermediate posture (oblique posture shown by dotted line 4C).

  Such a damper device 1 is disposed inside a duct that forms a cold air passage. Here, the cold air flows through the opening 210 from the opposite side to the side where the baffle 4 is disposed with respect to the opening 210 as indicated by an arrow D in FIG. Alternatively, as shown by an arrow E in FIG. 1B, the air flows through the opening 210 from the side where the baffle 4 is disposed with respect to the opening 210. In this embodiment, as indicated by an arrow E in FIG. 1B, the air flows through the opening 210 from the side where the baffle 4 is disposed with respect to the opening 210. Therefore, in the intermediate posture, the direction in which the baffle 4 tries to rotate by its own weight is opposite to the direction in which the baffle 4 tries to rotate by the pressure received from the cold air (airflow) passing through the opening 210. Therefore, the baffle 4 is difficult to rotate due to the pressure received from its own weight or cold air.

(Configuration of baffle 4)
FIG. 3 is an explanatory diagram of the baffle 4 of the damper device 1 according to the first embodiment of the present invention. FIG. 3A is a perspective view of the baffle 4 seen from the opening 210 side, and FIG. b) is a perspective view of the baffle 4 as viewed from the side opposite to the opening 210. FIG.

As shown in FIGS. 1, 2, and 3, the baffle 4 is attached to the opening / closing plate 40 including the flat plate portion 41 having a size larger than the opening 210 and the surface of the opening / closing plate 40 on the opening 210 side. And an elastic sheet 49 made of foamed polyurethane or the like, and the elastic sheet 49 abuts around the opening 210 to close the opening 210. Further, in the opening / closing plate 40, the surface of the flat plate portion 41 opposite to the opening 210 (the surface on the side where the other end 97 of the torsion coil spring 9 to be described later contacts) extends along the outer edge of the baffle 4. Ribs 42, 43, 44 and 45 are formed. Here, the upper rib 42 and the lower rib 43 have the same protruding dimension in the extending direction, whereas the side ribs 44 and 45 protrude from the upper side downward. Has a trapezoidal shape that increases linearly.

  Further, the baffle 4 has a shaft portion 46 that protrudes from the lower position of the side plate portion 47 constituting the rib 45 on one side X1 in the X direction toward the other side X2 in the X direction at a position below the flat plate portion 41. ing. The shaft portion 46 is formed coaxially with the rotation center axis L, and one side X <b> 1 in the X direction of the shaft portion 46 is connected to the drive unit 6. Therefore, the shaft portion 46 includes a first shaft portion 461 connected to the drive unit 6 on one side of the rotation center axis L, and a second shaft portion protruding from the first shaft portion 461 to the other side of the rotation center axis L. 462, and the second shaft portion 462 has an outer diameter smaller than that of the first shaft portion 461. For this reason, the first shaft portion 461 has an end surface 460 facing the other side X2 in the X direction around the first shaft portion 461.

  Further, the baffle 4 has a cylindrical portion 485 at a position below the flat plate portion 41 and below the side plate portion 48 constituting the rib 44 on the other side X2 in the X direction. A shaft-shaped supported portion 486 that is rotatably supported by the first frame 21 protrudes toward the other side X2 (outside) of the first frame 21.

(Configuration of the drive unit 6)
FIG. 4 is an explanatory diagram of the drive unit 6 of the damper device 1 according to the first embodiment of the present invention, and FIG. 4A is an explanatory diagram illustrating a configuration for driving the baffle 4. (B) is explanatory drawing which shows a part of structure for driving the baffle 5 shown in FIG.

  As shown in FIG. 4A, the drive unit 6 transmits the motor 60 disposed inside the second frame 22, the reduction wheel train 65, and the rotation of the motor 60 via the reduction wheel train 65. The motor 60 includes a drive gear 69 and a driven gear 61 that is driven in a specific section by the rotation of the drive gear 69. In this embodiment, the motor 60 is a stepping motor. The motor 60 is held between the first frame 21 and the second frame 22, and the reduction gear train 65 is rotatably supported by the second frame 22 and the connecting plate portion 215 of the first frame 21, and the drive gear 69 and the driven gear 61 are rotatably supported by the second frame 22.

  The reduction wheel train 65 includes a first wheel 66 having a large diameter gear 661 that meshes with the motor pinion 601 and a second wheel having a large diameter gear 671 that meshes with a small diameter gear (not shown) of the first wheel 66. 67 and a third wheel 68 having a large-diameter gear 681 that meshes with a small-diameter gear (not shown) of the second wheel 67, and a drive gear 69 meshes with the small-diameter gear 682 of the third wheel 68. ing.

  The drive gear 69 includes a cylindrical portion 695 and a sector gear 696 formed on the other side X2 in the Z direction with respect to the cylindrical portion 695. The driven gear 61 includes a cylindrical portion 611, a sector gear 612 formed on the outer peripheral surface of the cylindrical portion 611, and an output shaft 613 protruding from the cylindrical portion 611 to the other side X2 in the Z direction. Therefore, the rotation of the drive gear 69 is transmitted to the driven gear 61 only when the sector gears 612 and 696 are engaged. Here, in the sector gear 612 of the driven gear 61, the tooth portion 615 is formed thick in the axial direction, whereas the tooth portion 616 is formed thin in the axial direction, and the tooth portion 616 is the drive gear. When riding on 69, the tooth portion 615 comes into contact with the outer peripheral surface of the cylindrical portion 695 of the drive gear 69 to prevent useless rotation of the driven gear 61.

Here, the output shaft 613 has a flat portion formed on a part of the outer peripheral surface. Further, the first shaft portion 461 of the baffle 4 described with reference to FIG. 3 and the like is formed with a hole 469 that opens toward the opposite side to the second shaft portion 462 side. The output shaft 613 is fitted. Inside the hole 469, a flat portion that overlaps the flat portion of the output shaft 613 is formed. Therefore, as a result of the rotation of the output shaft 613 being transmitted to the first shaft portion 461 of the baffle 4, the baffle 4 rotates with the center axis of the output shaft 613 and the first shaft portion 461 as the rotation center axis L. The motor 60 is a stepping motor and can rotate in both directions. Accordingly, the baffle 4 is rotationally driven in both the opening direction and the closing direction.

  When the baffle 5 shown in FIG. 1 is driven together with the baffle 4, the transmission wheel 64 including the sector gear 642 and the sector-shaped engagement protrusion 641 is connected to the drive gear 69 as shown in FIG. The driving gear 69 is provided with a driving force transmission portion for the engagement protrusion 641 at a predetermined angular position. A driven gear (not shown) for the baffle 5 similar to the driven gear 61 is arranged coaxially with the driven gear 61. According to this configuration, when the drive gear 69 rotates, the transmission wheel 64 rotates in a predetermined angle range, so that the baffle 5 can be driven at a predetermined timing via the driven gear for the baffle 5.

(Configuration of torsion coil spring 9)
FIG. 5 is an explanatory view of the torsion coil spring 9 provided in the damper device 1 according to Embodiment 1 of the present invention, and is an explanatory view of the periphery where the torsion coil spring 9 is disposed as viewed from the other side X2 in the X direction. .

  As shown in FIGS. 1B, 2, and 5, the damper device 1 according to this embodiment includes a torsion coil spring 9 that urges the baffle 4 in one of the closing direction and the opening direction with respect to the opening 210. Has been. In this embodiment, the torsion coil spring 9 urges the baffle 4 in the closing direction with respect to the opening 210 as indicated by an arrow C in FIG. The baffle 4 is pressed around the opening 210 by the driving force of the motor 60. For this reason, even when the urging force of the torsion coil spring 9 is small, the opening 210 can be reliably closed. In the closed state, the force that presses the baffle 4 toward the opening 210 by the driving force of the motor 60 is greater than the bias that the torsion coil spring 9 presses the baffle 4 toward the opening 210.

  More specifically, the torsion coil spring 9 has a winding portion 90 disposed around the rotation center axis L of the baffle 4, and one end 91 extending from the winding portion 90 abuts the frame 2 and is wound. The other end 97 extending from the portion 90 is in contact with the surface opposite to the opening 210 of the baffle 4. Here, the winding portion 90 is disposed around the second shaft portion 462 in the shaft portion 46. In this state, the outer diameter of the winding portion 90 of the torsion coil spring 9 is smaller than the outer diameter of the first shaft portion 461. Further, the winding portion 90 is located adjacent to the end surface 460 of the first shaft portion 461. For this reason, the position of the winding part 90 in the 1st axial part 461 side is prescribed | regulated.

  In this embodiment, the one end 91 extending from the winding part 90 is directed from the other side Y2 in the Y direction toward the one side Y1 with respect to the support plate part 240 protruding from the first frame 21 to the other side Z2 in the Z direction. It is in contact with elasticity.

  The other end 97 extending from the winding portion 90 is a portion bent to one side X1 in the X direction on the distal end side of the extending portion 96 extending linearly outward from the winding portion 90 in the radial direction. . Therefore, even when the extending portion 96 extends at a position shifted from the center in the X direction of the baffle 4 to the other side X2, the other end 97 is in the center in the X direction of the baffle 4 and in the X direction. It is in contact with the center in the direction perpendicular to the direction.

In this state, as shown in FIG. 5, when viewed from the direction of the rotation center axis L, the portion of the torsion coil spring 9 extending from the winding portion 90 to the other end 97 is the thickness of the entire baffle 4 including the shaft portion 46. It is within the range of the direction (within the range indicated by the arrow S). In realizing this configuration, in this embodiment, in the thickness direction of the baffle 4, the rib 43 is lower than the outer peripheral surface of the shaft portion 46, and the height difference between the rib 43 and the outer peripheral surface of the shaft portion 46 is The wire diameter of the torsion coil spring 9 is larger. Further, in the thickness direction of the baffle 4, the rib 43 is lower than the outer peripheral surfaces of the ribs 44 and 45 and the shaft portion 46, and the connecting portion between the ribs 44 and 45 and the rib 43 has a torsion coil spring 9. A step larger than the wire diameter is formed. Therefore, as shown in FIG. 5, even when the baffle 4 is in the open position, the portion of the torsion coil spring 9 that extends from the winding portion 90 to the other end 97 contacts the support plate portion 240 of the first frame 21. There is nothing.

  Further, in the baffle 4, the ribs 42, 43, 44, 45 are within the range in the thickness direction of the part excluding the ribs 42, 43, 44, 45 in the entire baffle 4 including the shaft portion 46 (within the range indicated by the arrow S). )It is in. Therefore, the baffle 4 can be thinned.

  Further, the torsion coil spring 9 is located inside the outer edge of the frame 2. For this reason, even when the damper device 1 is disposed in a duct or the like, the torsion coil spring 9 does not contact the duct.

  In the torsion coil spring 9 configured as described above, the urging force that the baffle 4 receives from the torsion coil spring 9 in the intermediate posture is smaller than the stopping force that the detent torque of the motor 60 that is a stepping motor acts on the baffle 4. For this reason, the baffle 4 does not rotate by the biasing force received from the torsion coil spring 9 in the intermediate posture. In the intermediate posture, the force that the baffle 4 tries to rotate by the biasing force of the torsion coil spring 9 is rotated by the force that the baffle 4 tries to rotate due to its own weight and the pressure that the baffle 4 receives from the airflow passing through the opening 210. It is preferable that the force is greater than For this reason, it is difficult for the baffle 4 to rotate due to pressure received from its own weight or airflow.

  Further, the torsion coil spring 9 generates a biasing force when the baffle 4 is in any of the closed posture, the open posture, and the intermediate posture. For this reason, even if the torsion coil spring 9 is mounted with the baffle 4 in any posture, the torsion coil spring 9 is held between the frame 2 and the baffle 4 by its own biasing force. For example, in this embodiment, the torsion coil spring 9 is mounted with the baffle 4 in the open posture. Even in this case, the torsion coil spring 9 is held between the frame 2 and the baffle 4 by its own biasing force.

(Main effects of this form)
As described above, in the damper device 1 of the present embodiment, the baffle 4 is urged by the torsion coil spring 9, so that the influence of the backlash between the gears in the drive unit 6 can be suppressed by the spring. Further, since the torsion coil spring 9 is disposed around the rotation center axis L of the baffle 4, a space for disposing the torsion coil spring 9 may be small. Therefore, the damper device 1 can be reduced in size.

  Further, since the winding portion 90 of the torsion coil spring 9 is disposed around the shaft portion 46 of the baffle 4, a portion where the torsion coil spring 9 is provided can be secured with a simple configuration. Moreover, since the 2nd axial part 462 located inside the winding part 90 among the axial parts 46 is smaller in outer diameter than the 1st axial part 461, it winds to the radial direction outer side from the 1st axial part 461. The overhanging of the portion 90 can be suppressed. Accordingly, no extra space is generated around the rotation center axis L of the baffle 4. Moreover, the outer diameter of the winding part 90 is smaller than the outer diameter of the first shaft part 461. For this reason, the winding part 90 does not protrude outwardly in the radial direction from the first shaft part 461. Therefore, the damper device 1 can be downsized. Moreover, since the winding part 90 exists in the position adjacent to the end surface 460 of the 1st axial part 461, the position of the winding part 90 in the 1st axial part 461 side is prescribed | regulated. Therefore, the torsion coil spring 9 can be positioned by mounting the winding portion 90 around the second shaft portion 462.

[Improvement of Embodiment 1]
FIG. 6 is an explanatory diagram of a stopper provided in the damper device 1 according to the improved example of the first embodiment of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, in the damper device 1 of the present embodiment, the torsion coil spring 9 prevents the rotation center axis L from moving to the other side (the other side X2 in the X direction) of at least one of the baffle 4 and the frame 2. A stopper is provided. As such a stopper, a projection 419 provided at a position adjacent to the other end 97 of the torsion coil spring 9 on the other side X2 in the flat plate portion 41 of the opening / closing plate 40 of the baffle 4 can be used. Further, as the stopper, a protrusion 439 provided at a position adjacent to the extending portion 96 of the torsion coil spring 9 on the other side X2 in the X direction in the rib 43 of the opening / closing plate 40 of the baffle 4 can be used. Further, as the stopper, a protrusion 219 provided at a position adjacent to the one end 91 of the torsion coil spring 9 on the other side X2 in the X direction in the support plate portion 240 of the first frame 21 can be used. According to such a configuration, there is an effect that the torsion coil spring 9 is not easily detached from the shaft portion 46.

[Embodiment 2]
FIG. 7 is an explanatory view of the damper device 1 according to Embodiment 2 of the present invention. FIG. 7A is a perspective view of the opening 210 viewed from the side opposite to the side where the baffle 4 is disposed. FIG. 7B is a front view seen from the side where the baffle 4 is disposed with respect to the opening 210, and FIG. 7C shows the torsion coil spring 9 from the other side X2 in the X direction. FIG. FIG. 8 is an explanatory view of the torsion coil spring 9 provided in the damper device 1 according to Embodiment 2 of the present invention, and is an explanatory view of the periphery where the torsion coil spring 9 is disposed as viewed from the other side X2 in the X direction. . Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIGS. 7 and 8, the damper device 1 of the present embodiment also includes the torsion coil spring 9 that urges the baffle 4 in either the closing direction or the opening direction with respect to the opening 210, as in the first embodiment. Has been. In this embodiment, the torsion coil spring 9 urges the baffle 4 in the closing direction with respect to the opening 210 as indicated by an arrow C in FIG.

  More specifically, in the torsion coil spring 9, the winding portion 90 is disposed around the second shaft portion 462 in the shaft portion 46.

  In this embodiment, the one end 91 extending from the winding part 90 is directed from the other side Y2 in the Y direction toward the one side Y1 with respect to the support plate part 240 protruding from the first frame 21 to the other side Z2 in the Z direction. It is in contact with elasticity. Here, in the support plate portion 240, a first projection 219 is formed at a position adjacent to the one end 91 of the torsion coil spring 9 on the other side X2 in the X direction, and the first projection 219 is a torsion coil spring. 9 functions as a stopper that prevents the one end 91 of 9 from moving to the other side of the rotation center axis L (the other side X2 in the X direction).

  Here, the other end 94 extending from the winding portion 90 is in the Z direction among the Y-side surfaces 430 of the Y direction of the ribs 43 provided on the one side Y1 of the Y direction in the opening / closing plate 40 of the baffle 4. It abuts near the edge of the other side Z2. Further, the rib 43 is formed with a second protrusion 438 protruding to one side Y1 in the Y direction. The second protrusion 438 has the other end 94 of the torsion coil spring 9 on the other side of the rotation center axis L (X It functions as a stopper that prevents movement to the other side X2) of the direction.

  In this embodiment, the projecting dimension of the rib 43 is larger than that of the first embodiment in order to make the other end 94 of the torsion coil spring 9 abut on the baffle 4 from the winding portion 90 to the other side Z2 in the Z direction. It is as. Even in this case, the ribs 42, 43, 44, and 45 are within the range in the thickness direction of the baffle 4 including the shaft portion 46 (within the range indicated by the arrow S in FIG. 8) when viewed from the direction of the rotation center axis L. . Therefore, the baffle 4 can be thinned. Further, when viewed from the direction of the rotation center axis L, the portion of the torsion coil spring 9 extending from the winding portion 90 to the other end 94 is within the range of the baffle 4 including the shaft portion 46 in the thickness direction (arrow S in FIG. 8). In the range indicated by Therefore, as shown in FIG. 8, even when the baffle 4 is in the open position, the portion of the torsion coil spring 9 that extends from the winding portion 90 to the other end 97 contacts the support plate portion 240 of the first frame 21. There is nothing.

  Further, in the torsion coil spring 9, the urging force that the baffle 4 receives from the torsion coil spring 9 in the intermediate posture is smaller than the stopping force that the detent torque of the motor 60 that is a stepping motor acts on the baffle 4. For this reason, the baffle 4 does not rotate by the biasing force received from the torsion coil spring 9 in the intermediate posture. In the intermediate posture, the force that the baffle 4 tries to rotate by the biasing force of the torsion coil spring 9 is rotated by the force that the baffle 4 tries to rotate due to its own weight and the pressure that the baffle 4 receives from the airflow passing through the opening 210. It is preferable that the force is greater than For this reason, it is difficult for the baffle 4 to rotate due to pressure received from its own weight or airflow. Further, the torsion coil spring 9 generates a biasing force when the baffle 4 is in any of the closed posture, the open posture, and the intermediate posture. For this reason, even if the torsion coil spring 9 is mounted with the baffle 4 in any posture, the torsion coil spring 9 is held between the frame 2 and the baffle 4 by its own biasing force. For example, in this embodiment, the torsion coil spring 9 is mounted with the baffle 4 in the open posture. Even in this case, the torsion coil spring 9 is held between the frame 2 and the baffle 4 by its own biasing force.

(Other embodiments)
The above embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, the damper device 1 in the above-described embodiment is for a refrigerator, but is not necessarily limited to the damper device used for the refrigerator.

DESCRIPTION OF SYMBOLS 1 Damper apparatus 2 Frame 4 Baffle 6 Drive part 9 Torsion coil spring 21 1st frame 42, 43, 44, 45 Rib 46 Shaft part 60 Motor 65 Deceleration wheel train 90 Winding part 91 One end 94, 97 of torsion coil spring The other of coil spring End 461 First shaft portion 462 Second shaft portion 210 Openings 219, 419, 439 Projection (stopper)

Claims (15)

A frame in which an opening is formed;
A baffle for opening and closing the opening;
The rotation of the motor is transmitted to the baffle via a speed reduction wheel train to rotate the baffle, and the baffle is closed with the opening closed, the opening open, and the closed attitude. A drive unit that switches to an intermediate posture between the open posture;
A winding part is arranged around the rotation center axis of the baffle, and one end extending from the winding part contacts the frame and the other end extended from the winding part contacts the baffle. A torsion coil spring that urges the baffle in one of a closing direction and an opening direction with respect to the opening;
A damper device comprising: The baffle includes a shaft portion that protrudes coaxially from the rotation center axis toward the other side of the rotation center axis.
The damper device according to claim 1, wherein the winding portion is disposed around the shaft portion. The shaft portion includes a first shaft portion connected to the driving portion on the one side of the rotation center axis, and an inner side of the winding portion on the other side of the rotation center axis with respect to the first shaft portion. A second shaft portion located at
The second shaft portion has an outer diameter smaller than that of the first shaft portion,
The said 1st axial part is formed toward the opposite side to the said 2nd axial part side, and the hole which the output shaft of the said drive part fitted was formed in the said 1st axial part. Damper device. The baffle includes a rib extending along an outer edge of the baffle on a surface on a side where the other end of the torsion coil spring contacts.
4. The damper according to claim 3, wherein the rib is located within a range in a thickness direction of a portion excluding the rib in the entire baffle including the shaft portion when viewed from the axial direction of the rotation center. 5. apparatus.   5. The damper device according to claim 3, wherein an outer diameter of the winding portion is smaller than an outer diameter of the first shaft portion.   The position of the winding part on the first shaft part side of the torsion coil spring is defined by an end surface of the first shaft part on the second shaft part side. A damper device according to claim 1.   The damper device according to any one of claims 2 to 6, wherein at least one of the baffle and the frame is provided with a stopper for preventing the torsion coil spring from moving to the other side. .   A portion of the torsion coil spring extending from the winding portion to the other end when viewed from the rotation center axis direction is located within a range in the thickness direction of the entire baffle including the shaft portion. The damper device according to any one of claims 2 to 7.   The damper device according to any one of claims 1 to 8, wherein the torsion coil spring generates an urging force in any of the closed position, the open position, and the intermediate position.   The damper device according to any one of claims 1 to 9, wherein the torsion coil spring is located inside an outer edge of the frame. The motor is a stepping motor;
The damper device according to any one of claims 1 to 10, wherein the torsion coil spring biases the baffle in a closing direction.   The damper device according to claim 11, wherein the baffle is pressed around the opening by a driving force of the motor.   13. The damper device according to claim 11, wherein an urging force that the baffle receives from the torsion coil spring in the intermediate posture is smaller than a stop force that a detent torque of the stepping motor acts on the baffle.   In the intermediate posture, the force that the baffle tries to rotate by the urging force of the torsion coil spring is rotated by the force that the baffle tries to rotate by its own weight and the pressure that the baffle receives from the airflow passing through the opening. The damper device according to claim 13, wherein the damper device is larger than a force to be applied.   The direction in which the baffle attempts to rotate due to its own weight and the direction in which the baffle attempts to rotate due to the pressure received from the airflow passing through the opening in the intermediate posture are opposite to each other. The damper apparatus as described in any one of these.

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