JP3270889B2 - Motor type damper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device using a motor as a drive source and operating a baffle for an opening, and more particularly to a motor type damper device suitable for controlling the intake of cold air in a refrigerator. About.

[0002]

2. Description of the Related Art As shown in FIGS. 16 and 17, a conventional damper device, especially a motor type damper device for a refrigerator, has a baffle 52 and a driving mechanism 53 such as a motor, etc. Are arranged (see Japanese Patent Application Laid-Open No. 6-109354). The backlash of the baffle 52 and the engagement between members in the drive mechanism 53 are provided with a backlash.
And a leaf spring (not shown) that constantly presses the baffle 52 in the closing direction to increase the degree of sealing of the frame 54. In order to further improve the degree of sealing, a soft tape 55 is attached to a surface of the baffle 52 that abuts on the frame 54 so that the frame 54 sinks.

[0003] A motor-type damper device 5 having such a structure.
0 is used in the refrigerator 60 as shown in FIG. That is, the refrigerator 60 is divided into a freezer compartment 61, a refrigerator compartment 62 and a vegetable compartment 63, and an evaporator 64 is provided at the bottom of the freezer compartment 61. Evaporator 6
A fan motor 65 is disposed at the rear of the fan 4 to circulate the obtained cool air to the freezing room 61 and the refrigerating room 62.

[0004] A partition slope 66 is provided between the evaporator 64 and the refrigerating chamber 62 to block the cool air of the evaporator 64 from flowing directly to the refrigerating chamber 62. On the other hand, a cool air passage 67 is formed between the rear part of the partition slope 66 and the rear inner wall of the refrigerator 60, and the damper device 50 is disposed in the cool air passage 67. When the baffle 52 of the damper device 50 is in an open state, the cool air flow passage 67, which is a passage for the cool air, has a crank shape. Further, the damper device 50 is installed so as to be held by a partition wall 68 forming a part of the cool air flow passage 67.

[0005] In recent years, along with the mid-freezer of a refrigerator, a type of refrigerator has been developed in which cold air obtained at a central evaporator is transferred to a refrigerator room located at an upper position and a distant position.

[0006]

In the conventional motor type damper device 50 shown in FIGS. 16 and 17, the rotational torque of the motor is converted into the thrust torque of the spindle through a cam. The baffle 52 is driven to rotate about the rotation support shaft 51 by the thrust torque of the spindle. in this way,
Since the rotational direction torque is changed to the thrust direction torque, it is necessary to provide rattling when the baffle 52 is closed in consideration of the accuracy of each component. In addition, because of this rattling, it is necessary to press down the baffle 52 with a leaf spring or the like.

A conventional motor type damper device 50
Is a type orthogonal to the cool air flow passage 67, and can be used only for bending the flow of the cool air at a right angle. Moreover, in the refrigerator 60 using such a damper device 50,
Since the cold air passage 67 has a crank shape, the cold air passage 6
7 becomes long, and loss occurs in terms of cold air transmission. This loss is extremely disadvantageous for the refrigerator in the mid-freezer partly due to its long cool air passage. Moreover, since the cold air flow passage 67 has a crank shape,
As shown in FIG. 18, the protrusion width M of the partition wall 68 into the inside of the refrigerator 60 is increased, which contributes to a reduction in the volume of the refrigerator 60.

Further, the opening operation of the baffle 52 does not open to a position parallel to the flow of cold air,
As shown in FIG. 7, since the baffle 52 opens only up to the oblique position, the baffle 52 becomes resistant to the flow of the cool air, which is not preferable for quick diffusion of the cool air.

Further, such a motor type damper device 5
In a damper device used for a refrigerator or the like, including zero, when the baffle 52 is in the closed position, it is required to completely shut off cold air and the like. On the other hand, the baffle 52
When in the closed position, the baffle 52 etc. freezes with other parts,
You need to be careful not to lock it. further,
Pressing with a leaf spring has a strong force and is preferable for complete blocking, but is not preferable for stable operation of the driving mechanism 53 such as a motor because the pressing force varies greatly depending on the position of the baffle 52. .

The present invention has been made in view of the above problems, and has as its object to provide a motor-type damper device that does not rattle even if a leaf spring is unnecessary. Also, the present invention can fully utilize the size of the baffle,
It is another object of the present invention to provide a motor-type damper device that can surely close a baffle.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a motor, a baffle driven by the motor, and a frame having an opening that is opened and closed by the baffle are provided. the motor type damper device having, between the motor and the baffle, the motor
A reduction gear train that reduces the rotation and transmits it to the baffle is provided, and the driving force of the motor is further transmitted to the baffle with the opening closed ,
When the motor rotor stops because it cannot rotate any more
The detent torque of the generated motor,
Baffle by the detent torque transmitted through
To the closing direction and reduce the baffle rotation center axis.
To match the center of the gear that was decelerated by the speed train
Provided .

In addition, in the invention according to claim 2, in the motor type damper device according to claim 1, the motor is stopped after receiving a signal to advance the baffle further toward the opening from a position where the baffle contacts the opening. I have.

In the invention according to claim 3 , the invention according to claim 3
In the motor type damper device described in 1 or 2 , the baffle is provided with a buffer member that is in close contact with the opening, and the buffer member is abutted against the opening by the detent torque. In addition, in the invention according to claim 4 ,
In the motor-type damper device according to the third aspect, a projecting portion that contacts the buffer member is formed in the opening.

Further, in the invention according to claim 5, in a motor-operated damper device having a motor, a baffle driven by the motor, and a frame having an opening opened and closed by the baffle, the motor is provided inside. The cover having the cover is arranged on the side extending in the direction of the rotation center axis of the baffle, and the rotation center axis is connected to the reduction gear train inside the cover, and the frame is positioned on the side of the cover in the depth direction. As the length becomes shorter than the cover,
Cover with arranged so that Osama in both ends in the depth direction of the chromatography, the baffle covers the outer periphery of the frame baffle when in the closed position, when the baffle is in the open position, the tip of the baffle popping from the frame In the side space.

In this motor type damper device, the rotational force of the motor is transmitted to the baffle, and the baffle opens and closes an opening provided in the frame. When the opening is closed by the baffle, the baffle is urged in the closing direction by the detent torque of the motor. For this reason,
The opening is firmly closed by the baffle, and a pressing member such as a leaf spring is not required. When the baffle closes the opening and the buffer member provided on the baffle is recessed by the opening, the baffle tightly seals the opening.

When the protrusion is provided in the opening and the buffer member of the baffle is brought into contact with the protrusion, the buffer member is recessed by the protrusion, and the close contact between the opening and the baffle is improved. In addition, if the motor is stopped at a position where the baffle slightly advances toward the opening from the position where the baffle is in contact with the opening, the protrusions and the like bite into the buffer member and the like, and the hermetically sealed state is improved.

Also, the motor is placed beside the baffle,
When the main part of the frame is constituted by the opening, the opening can be made to have a large area. For this reason, for example, the cool air in the refrigerator flows smoothly along the opening. In addition, since the size of the frame portion is reduced for the size of the opening, the shape change on the side where the motor-type damper device is mounted can be minimized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor type damper device according to the present invention will be described with reference to FIGS. This motor type damper device is used for a refrigerator.

This motor type damper device comprises a motor composed of a stepping motor 1, a cylindrical frame 2 having both ends opened, an opening 3 formed inside the frame 2, and a Baffle 4 that opens and closes
It is mainly composed of

As shown in FIG. 9, the stepping motor 1 has a fixed shaft 5 on which a rotor 7 having a pinion 6 is rotatably fitted. The pinion 6 meshes with a gear portion 8 a of the gear 8, and the pinion portion 8 b of the gear 8 meshes with a sector gear 9. The gear train reduces the rotation of the stepping motor 1 in this manner and transmits the rotation to the sector gear 9. The shaft 4b of the baffle 4 is fitted to the rotation center shaft 10 of the sector gear 9, and transmits the rotation of the sector gear 9 to the shafts 4a and 4b of the baffle 4. A cover 11 made of ABS resin is attached to one side surface of the frame 2 with a plurality of screws 12 so as to cover these moving mechanisms for rotating the baffle 4. The shaft portions 4a, 4b of the baffle 4
And the rotation center shaft 10 constitute a support portion of the baffle 4. Further, the pinion 6, the gear 8, the sector gear 9, and the rotation center shaft 10 constitute transmission means. The sector gear 9 has an opening angle of 110 degrees and an operating range β of about 90 degrees.

The frame 2 is made of ABS resin. In this embodiment, the frame 2 has a thin rectangular column shape.
An opening 3 is formed inside the frame 2, and the shafts 4 a and 4 b of the baffle 4 are housed in the frame 2.

On the other hand, the opening 3 is formed by an opening forming portion 3a projecting parallel to the frame 2 surrounding the opening 3b. The portion of the opening forming portion 3a facing the opening 3b is a protruding portion 3c abutting on the baffle 4.
, Forming a contact surface. The opening 3
Is formed integrally with the frame 2, but may be formed as a separate member.

The baffle 4 is made of polycarbonate. A soft tape 13 serving as a cushioning member is fixed to the opening 3 side of the baffle 4 to constitute a part of the baffle 4. As shown in FIG. 2, the rear side of the baffle 4 keeps the strength of the baffle 4.
A rib 14 having a square shape is provided. Further, as shown in FIG. 2, a slanted rib portion 15 and a drainage portion 16 in which the rib 14 is cut out are formed so that frost and water do not adhere to form ice. The baffle 4 is rotatable about a shaft 4a engaged with the rotation center shaft 10, and moves between an open position indicated by a dashed line in FIG. 1 and a closed position indicated by a solid line. The soft tape 13 is made of foamed polyurethane so as to increase the amount of sink when it comes into contact with the protruding portion 3c, but may be made of another elastic member, for example, foamed polyethylene or a rubber member.

The shaft portion 4a of the baffle 4 is provided with an oval-shaped shaft insertion hole, and the rotation center shaft 10 is fitted therein.
Further, the shaft portion 4b is provided with a protruding shaft 4c, and is rotatably supported by an engagement hole of the frame 2.

The engagement between the baffle 4 thus configured and the rotation center shaft 10 is performed as follows. First, the baffle 4 is held on the frame 2 at a position substantially coincident with its installation position, and the projecting shaft 4c of the shaft portion 4b of the baffle 4 shown in FIG. Thereafter, the rotation center shaft 10 is fitted into the shaft insertion hole of the shaft portion 4a. And
Using the screw 12, the frame 2 and the cover 11 are integrated. Thus, the baffle 4 is supported by the frame 2 and the rotation center shaft 10.

The circuit configuration of the stepping motor 1 is as shown in FIG. That is, it is composed of two windings 16, eight transistors 17, and eight diodes 18, and each element is symmetrically arranged so as to be bipolar-driven. The stepping motor 1 has a step angle of 7.5 degrees, a power supply voltage of 12 V DC, a working frequency of 400 pps, a torque during rotation of about 40 g.cm, and a detent torque of about 1.
0 g.cm. The output of such a stepping motor 1 is reduced by a factor of 25 by the gear train. As a result, the step angle of the rotation center shaft 10 when this stepping motor 1 is used is 0.29 degrees, the output torque is about 1,000 g.cm, and the position is determined by the static torque, that is, the detent torque of the stepping motor 1. The retained torque amounts to about 250 g.cm. Further, the stepping motor 1 is controlled such that the maximum rotation angle of the rotation center shaft 10 is about 90 degrees.

The motor type damper device configured as described above is incorporated in a refrigerator, for example, in a form as shown in FIG. Here, the same members as those shown in FIG. 18 are denoted by the same reference numerals, and description thereof will be omitted.

The refrigerator 20 is a refrigerator which is a mid-freezer. A freezer compartment 61 is provided at the center, a refrigerator compartment 62 is provided at an upper portion, and a vegetable compartment 63 is provided at a lower portion. Then, the duct 21 for blowing cool air to the refrigerator compartment 62
The motor-type damper device is fitted in a portion of the duct 21 that communicates with the refrigerator compartment 62. That is, the frame 2 of this motor type damper device
Are fitted so as to form a part of the duct 21, and the damper device itself also serves as the duct 21. In addition, this motor type damper device is not a refrigerator room 62 but a vegetable room 6
3 or as shown in FIG. Furthermore, the entrance of the duct 21,
In other words, it may be provided at the exit of the room of the evaporator 64.

Next, the operation of the motor type damper device will be described.

A CPU or the like for controlling the temperature in the refrigerator 20 instructs the motor type damper device to introduce cold air. Then, the stepping motor 1 is driven, and the rotation is transmitted to the baffle 4 via the pinion 6, the gear 8, the sector gear 9, the rotation center shaft 10, and the shafts 4a, 4b. As a result, the baffle 4 is separated from the opening 3 and is in an open position which is a position parallel to the frame 2 (see a dashed line in FIG. 1).
Go to

When the number of steps of the stepping motor 1 reaches a predetermined number, in this embodiment, 310, the baffle 4
Rotates 90 degrees to reach the open position, and the stepping motor 1 stops driving. At this time, even if a detection error of the number of steps or the like occurs and the stepping motor 1 does not stop, the baffle 4 does not move too much because the sector gear 9 hits the cover 11 and rotation is prevented. Then, the open position state is held by the energizing holding force or the detent torque of the stepping motor 1. In this open position, since cold air does not strongly hit the baffle 4, the force for maintaining the position of the baffle 4 can be small. Incidentally, the cool air in the refrigerator has a force of about 10 to 20 g, while the static torque of the shaft 10 due to the detent torque of the stepping motor 1 is about 250 g.cm. Detent torque is sufficient for holding.

A room to which cold air is to be sent, for example, a refrigerator 62
When the baffle 4 cools down and a signal instructing to close the baffle 4 is generated, the stepping motor 1 is rotated in the direction opposite to that in the previous driving in the opening direction, and the baffle 4 starts to be driven in the closing direction. The moving position is detected based on the number of pulses, and is determined by a predetermined number of pulses, which is 3 in this embodiment.
When the number reaches 14, the position of the baffle 4 is determined to be closed, and the driving of the stepping motor 1 is stopped. The drive of the stepping motor 1 is stopped after moving by four steps even after the soft tape 13 fixed to the baffle 4 contacts the protruding portion 3c of the opening 3. That is, the number of steps until the baffle 4 comes into contact with the protrusion 3c is 3
Although the number is 10, the stepping motor 1 is driven for 4 steps even after the contact. It is sufficient that the number of steps for this plus is at least one.
Most preferably, the angle of the rotation center axis 10 is more than 0 degree and up to 2 degrees. The number may be eight or more, but lock noise may occur, and it is better to reduce the number as much as possible.

As described above, since the stepping motor 1 is driven even after the baffle 4 comes into contact with the protrusion 3c, the torque of the stepping motor 1 is applied to the baffle 4, and the soft tape 13 having elasticity is pressed. As a result, the protruding portion 3c bites into the soft tape 13 and abuts tightly without any gap. In this contact, if the protrusion amount of the protrusion 3c of the opening 3 or the shape of the baffle 4 varies, or if the gear 8 or the like has a backlash, the contact may not be performed completely. In this motor type damper device, the stepping motor 1 is driven even after the soft tape 13 is in contact with the protruding portion 3c.
Since the protrusion 3c is digged into the inside 3, even if there is such a variation, the protrusion 3c can be brought into contact with no gap.

Here, even after the baffle 4 hits the projecting portion 3c and the stepping motor 1 further moves by four steps, the power supply to the stepping motor 1 is continued without stopping the power supply to the stepping motor 1. You may do it. Even if the power is continuously supplied as described above, the stepping motor 1 cannot rotate and the stepping motor 1 is out of synchronization. Alternatively, the number of steps may be 314 and the hold state may be set. The microcomputer or the like in the refrigerator detects the out-of-step state or the hold state, and can confirm the origin. That is, this closed position is the origin of the movement of the baffle 4.

When the power supply to the stepping motor 1 is cut off after the predetermined number of steps or after the step-out is confirmed, the elastic repulsive force of the soft tape 13 is applied to the sector gear via the rotation center shaft 10. 9 and the gears such as the gear 8 and the rotor 7. However, the stepping motor 1 has the detent torque as described above, and the rotor 7 does not rotate. Therefore, backlash in each of the gears 8, 9 and the like is eliminated, and play is eliminated in the transmission mechanism from the rotor 7 of the stepping motor 1 to the baffle 4. In addition, since the detent torque of the stepping motor 1 has a large value of about 250 g.cm in the portion of the rotation center shaft 10, the baffle 4 is firmly held in the closed position. The backlash of each of the gears 8 and 9 in this embodiment is 0.01 mm in distance.
mm, which is extremely small, but if this backlash is eliminated, it is advantageous in preventing backlash.

Here, the movement time of the baffle 4 from the open position (the dashed line position in FIG. 1) to the closed position (the solid line position in FIG. 1) and the reverse direction is controlled by the pulse generation rate. In this example, since the speed is 400 pps, the baffle 4 moves to the closed position and the open position in about 1 second. However, other pulse rates can be used. If the baffle 4 is to be stopped between the open and closed positions instead of the fully open position (two-dot chain line in FIG. 1), the baffle 4 is once moved to the closed position, and then returned to the original position. This is performed by stopping the stepping motor 1 in a smaller number of stages than when the pulse from the origin is at the open position. In addition, from the open position (the dashed line position in FIG. 1) to the closed position (the solid line position in FIG. 1).
Is set to about 90 degrees in this embodiment, but other angles can be appropriately adopted.

In this embodiment, since the opening 3 is formed perpendicular to the frame 2, the thickness of the frame 2 can be reduced. For this reason, the entire device including the frame 2 is reduced in size, and the motor-type damper device can be easily attached to another device such as a refrigerator. In addition, since the open position of the baffle 4 is set to a position substantially parallel to the frame 2, the cool air flowing along the frame 2 is almost completely blocked by the baffle 4 and the opening 3 in the open state. Instead, they flow straight. For this reason,
The transmission loss of the cold air is eliminated, and the refrigerator has a high efficiency of the cold air transmission and diffusion. Further, since the sector gear 9 is used, the capacity of the gear portion can be reduced for a large reduction ratio. In addition, since the sector gear 9 is attached to the cover 11 to cope with an operation failure such as runaway of the stepping motor 1, a motor-operated damper device with stable operation can be provided. Further, since the stepping motor 1 is used as the motor, forward and reverse rotation is possible, and the baffle 4 can be opened and closed directly without using a cam, a spindle or the like, and the positional accuracy can be improved.

Although the above embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. is there. For example, as shown in FIG. 14, the rotation fulcrum of the baffle 4 may be brought to the opening 3 side in consideration of the sinking amount of the soft tape 13 in advance.
That is, in the technique shown in FIGS.
In the state where the bite bites into the soft tape 13, as shown in FIG. 1, the bite amount Y near the rotation center axis 10 is small, and the bite amount X on the far side is large. That is, X> Y. For this reason, there is a danger that the close contact state on the side near the rotation center axis 10 may be deteriorated. On the other hand, if the configuration shown in FIG. Same as the far side,
Equalized in all parts. That is, both bite amounts X and Y become equal. On the other hand, if the bite amount is to be made equal when the baffle 4 is completely stopped, the first contact between the soft tape 13 and the protruding portion 3c is caused by the rotation center axis 1
Since the process is performed only on the side near zero, there is a risk that the contact on the side far from the rotation center axis 10 may be insufficient. For this reason, as shown in FIG. 15, it is preferable that the position of the rotation center axis 10 be located between the two. That is, assuming that the position shown in FIG. 1 is indicated by a one-dot chain line and the position shown in FIG. 14 is indicated by a two-dot chain line, in this modified example, the rotation center axis 10 is between them. At this time, the relationship between the bite amounts X and Y is X> Y.
And Y are smaller than in FIG.

Although the soft tape 13 is used in the above embodiment, the soft tape 13 may be omitted if the degree of sealing is not strictly required. In both cases where the soft tape 13 is attached and not attached, the stepping motor 1 may be stopped immediately with the opening 3 and the baffle 4 in contact. In addition to the stepping motor 1, a DC motor, an AC synchronous motor, or the like can be used as the motor. However, when a DC motor or the like is used, it is necessary to fix the magnet to the position detecting means of the baffle 4, for example, a sector gear 9, and use a Hall element for detecting the position of the magnet, or to control the operation time. .

Further, in the above-described embodiment, the reduction gear train is used, but the reduction gear train is not necessarily required. As a driving method of the stepping motor 1, other driving methods such as a bipolar driving and a unipolar driving can be appropriately adopted, and various specifications such as a step angle and a torque can be various values according to the usage form. Can be adopted.

In the above embodiment, the frame 2
Is a duct-shaped damper device, but can also be applied to a damper device having the same configuration as the conventional one shown in FIG. Further, the present invention can be applied to various damper devices for controlling other fluids, such as a ventilation duct, instead of a refrigerator. Further, the frame 2 may be configured using a frame on the side to which the damper device is attached, for example, a duct 21 for blowing cool air of a refrigerator shown in FIG.

[0042]

As described above, in the motor type damper device according to the first aspect, since the position of the baffle is held by the detent torque of the motor, a pressing member such as a leaf spring is not required. For this reason, it is not necessary to provide the backlash on each member, and the backlash is eliminated. Moreover, since there is no strong pressing member, a small-sized and low-power motor can be adopted as the motor for opening and closing the baffle.
The motor type damper device can be reduced in size and power consumption.

Further, according to the first aspect of the present invention, the speed is reduced.
The driving force of the motor is transmitted via the train wheel, and the speed is reduced.
Center of rotation of the baffle to match the center of the
A shaft is provided to drive the baffle.
Keep the baffle stationary, even if the tent torque is small
The static torque can be large enough. this
Therefore, a low-power and small motor can be adopted.
You. Also, baffle the torque in the rotation direction of the motor as it is.
Configuration to reduce mesh play between each member.
You. Therefore, the time for further driving in the closing direction, that is,
The lock time can be further shortened.

According to the second aspect of the present invention, the buffer
Position the motor that drives the baffle where the baffle contacts the opening.
Stop after receiving a signal to further advance to the opening side
The baffle and opening have high adhesion.
When the baffle is closed, there is little leakage of fluid such as cool air.
It becomes.

In addition, according to the third aspect of the present invention, the baffle is held in a state where the cushioning member is recessed, so that the degree of sealing when the baffle is closed is high. Furthermore, in the invention according to the fourth aspect , since the projection is provided in the opening and is brought into contact with the buffer member, the projection is firmly cut into the buffer member. For this reason, the degree of sealing is further improved.

In the motor type damper device according to the fifth aspect, the thickness of the frame surrounding the baffle is reduced, so that the size of the motor type damper device with the frame can be reduced. Further, the cover having the motor inside is positioned on the side extending in the direction of the rotation center axis of the baffle so that the rotation center axis is connected to the reduction gear train inside the cover, and in the depth direction (S1 in FIG. 4). From to S2
Direction) is shorter than the cover,
In the depth direction (the direction from S1 to S2 in FIG. 4)
Having disposed so that Osama in both ends of the direction), the take large openings in spite of the size of the baffles, the side space of the ducts facing the baffle, the motor is incorporated cover easily There can be a motorized damper device that can be arranged.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor type damper device of the present invention and a partially enlarged view thereof.

FIG. 2 is a rear view as viewed from the direction of arrow II in FIG. 1;

FIG. 3 is a front view as viewed from a direction indicated by an arrow III in FIG. 1;

FIG. 4 is a partial cross-sectional plan view as viewed from a direction indicated by an arrow IV in FIG. 1;

FIG. 5 is a side view as viewed from a direction indicated by an arrow V in FIG. 2;

FIG. 6 is a side view showing a state in which a baffle is opened, as viewed from a direction indicated by an arrow VI in FIG. 2;

FIG. 7 is a bottom view as seen from the direction of arrow VII in FIG. 6;

8 is a side view of the stepping motor and the transmission means used in the motor-type damper device of FIG. 1, viewed from a direction V in FIG. 2 and with a cover removed.

FIG. 9 is a sectional view taken along line IX-IX of FIG.

FIG. 10 is a sectional view taken along line XX of FIG. 8;

11 is a sectional view taken along the line XI-XI in FIG.

FIG. 12 is a drive circuit diagram of the motor type damper device of FIG. 1;

FIG. 13 is a view for explaining a state in which the motor-type damper device of FIG. 2 is incorporated in a refrigerator.

FIG. 14 is a diagram for describing a first modification of the embodiment of the present invention.

FIG. 15 is a diagram for describing a second modification of the embodiment of the present invention.

FIG. 16 is a rear view of a conventional motor type damper device.

FIG. 17 is a partial sectional side view of a conventional motor type damper device.

FIG. 18 is a view for explaining a state in which a conventional motor-type damper device is incorporated in a refrigerator. [Brief description of the drawings] 1 Stepping motor (motor) 2 Frame 3 Opening 3c Projecting part 4 Baffle 9 Sector gear 13 Soft tape (buffer member)

Claims (5)

(57) [Claims] 1. A motor type damper device comprising: a motor; a baffle driven by the motor; and a frame having an opening which is opened and closed by the baffle.
The rotation of the motor between the motor and the baffle
A deceleration wheel train that transmits the driving force of the motor to the baffle that closes the opening is provided.
Furthermore, the rotor of the above motor could rotate more
Detent torque of the above motor that occurs when a flaw stops
When the baffle is urged in the closing direction by detent torque transmitted through the reduction gear train,
In both cases, the rotation center axis of the baffle is
A motor type damper device provided so as to coincide with the center of a reduced gear . 2. The motor-operated damper device according to claim 1, wherein the motor is stopped after receiving a signal that causes the baffle to advance further toward the opening from a position where the baffle contacts the opening. 3. The baffle is in close contact with the opening.
A cushioning member is provided, and the buffer is provided by the detent torque.
The abutment member was brought into contact with the opening in a state of being recessed
3. A motor-operated dam according to claim 1, wherein
Par device. 4. An abutment for said buffer member against said opening.
4. The motor according to claim 3, wherein a projection is formed.
Type damper device. 5. A motor-operated damper device comprising: a motor; a baffle driven by the motor; and a frame having an opening which is opened and closed by the baffle.
A cover having the motor inside, arranged so that the rotation center axis is a side extending in the direction of the rotation center axis of the baffle and the rotation center axis is connected to the reduction gear train inside the cover,
Said frame comprising a laterally of the cover in the depth direction length
Is shorter than the above cover and the depth of the cover
Arranged so that Osama in the direction of the ends, the frame when the baffle is in the closed position covers the outer periphery of the baffle, when said baffle is in the open position, the tip of the baffle from the frame A motor-type damper device, wherein the motor-type damper device protrudes and fits in a side space of the cover.