JP6668557B2 - Revolving door drive - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary door driving device, and more particularly, to a home appliance such as an electric rice cooker, which rotates slowly in one direction and rotates quickly in another direction. Accordingly, the present invention relates to a rotary door drive device with improved usability and durability.

Generally, a rotating door system includes a door, a door frame to which the door is fixed, and a hinge connection for rotatably fixing the door to the door frame. For example, in electric rice cookers and garbage disposers, a door is rotatably mounted on an open portion of a main body having an open upper part. Here, a rotary damper device is used to open and close the door softly and smoothly. Is used.
FIG. 1 is a perspective view showing a coupling structure of a rotary damper device according to a prior patent (Patent Document 1) of the present applicant. As shown in FIG. 1, the conventional rotary damper device 200 is configured to rotate when a rotation damping target such as a lid of an electric rice cooker opens and closes up and down, in order to prevent a shock caused by a fast rotation. By adjusting the rotation speed by connecting to the rotation shaft 10 which is the center of movement, it is possible to prevent various safety accidents such as sudden finger pinching and damage to the product due to impact. The rotating shaft is not only a rotating shaft that rotates up and down like a lid of an electric rice cooker or a garbage disposer, but also a rotating shaft that rotates left and right like a door of furniture or a refrigerator. Including.

In the above configuration, the rotating shaft 10 is connected to the fixed holder 205, and the fixed holder 205 is connected to the lid, that is, the door, by the screw fastening unit 206. At this time, it is preferable that the polygonal section 11 is formed at both ends of the rotating shaft 10, and the polygonal section 11 is inserted and coupled to the polygonal hole 205 a of the fixed holder 205. Here, the polygonal hole 205a has a shape that matches the outer surface profile of the polygonal cross-section 11, and is desirably constrained so that the door rotates integrally with the rotary shaft 10.
Further, a torsion spring 210 for providing an elastic restoring rotational force for opening the door is interposed on the outer periphery of the rotating shaft 10. A part 212 and a door coupling extension part 211 are provided.
FIG. 2 is an exploded perspective view of a conventional rotary damper device. FIG. 3 is a vertical cross-sectional view illustrating the operation of the rotary damper device in FIG. 2 when it is opened, and FIG. 4 is a vertical cross-sectional view illustrating the operation of the rotary damper device in FIG. 2 when it is closed. The opening and closing in FIGS. 3 and 4 are based on the state in which the rotary damper device is installed on the left side of the electric rice cooker, and the same applies to the following description.

As shown in FIGS. 2 to 4, the conventional rotary damper device is large, and includes a rotary shaft 10, a rotor portion 20 fixed through the rotary shaft 10, a wing portion 30, a housing 40, and a stopper. 50, a first comb ring 60, a second comb ring 70, a seal member 80, and a housing cap 90.
In the above configuration, the housing 40 is connected to a main body such as an electric rice cooker so as to restrain the rotation of the rotary damper device 200, and the rotor unit 20 and the wing unit 30 are inserted into the hollow portion thereof. . The damping fluid is filled between the outer circumference 23 of the rotor section 20 and the inner circumference of the housing 40, and the damping fluid flows through a gap between the inner circumference of the housing 40 and the end of the wing section 30, thereby rotating and damping. Provide power.

At this time, the gap functions as a moving passage of the viscous damping fluid, and the smaller the gap, the larger the damping force that buffers the rotational force. The damping fluid may include, in order to form a damping force by viscous flow, not only a hydraulic oil in a liquid state having a viscosity such as a commonly used oil but also a gas forming a damping force by an atmospheric pressure.
The rotor section 20 is formed of a cylindrical main body fixed to one side of the rotating shaft 10. A knurled portion 12 provided with surface irregularities is provided at the center of the rotating shaft 10, and the inner periphery of the rotor portion 20 is also provided with irregularities on the knurled portion 12 in order to improve the rotation restraining force with the knurled portion 12. An unevenness having a shape matching the shape is provided.

At least one or more blades 21 protrude from the outer periphery 23 of the rotor section 20 at a predetermined angle in the radial direction. At this time, both side surfaces of the blade 21 are formed to be inclined at different angles from each other. The outer circumference 23 of the rotor section 20 is further provided with a rotation guide plate 24 connected to one end of the blade 21 and protruding along the circumferential direction, and the rotation guide plate 24 comes into contact with the inner circumference of the housing 40. Then, the rotor 20 is rotationally guided so as to operate correctly without flowing to the left and right. The rotation guide plate 24 also serves to seal the damping fluid filled between the housing 40 and the rotor unit 20 so as not to leak outside.
The housing cap 90 is coupled so as to cover an opening surface of a hollow portion formed inside the housing 40. The seal member is provided between the housing 40 and the housing cap 90 to prevent the damping fluid filled in the housing 40 from leaking. The second comb ring 70 is provided between the housing cap 90 and the sealing member 80, and the first comb ring 60 is provided between the rotation guide plate 24 and the housing 40, and the damping filled in the housing 40 is provided. Prevents external leakage of fluid and wear due to rotational friction of each part.

Next, a number of stoppers 50 corresponding to the number of blades 21 are provided on the inner circumference of the housing 40 to limit the rotatable angle of the rotor unit 20. The stopper 50 is provided on the inner circumference 42 of the housing 40, The seesaw projection 41a is connected to the seesaw groove 41 projecting inward. The stopper 50 can be selectively in contact with the outer periphery of the rotor unit 20 by performing seesaw movement about the seesaw projection 41a by the pressure of the damping fluid, thereby blocking the movement of the damping fluid.
On the other hand, the wing portion 30 is coupled so as to cover the outer surface of the blade 21. An upwardly inclined surface 32 is provided below the first surface 30a on the damper rotation direction side, that is, on the opening direction side. That is, a downward inclined surface 31 is provided above the second surface 30b in the closing direction, and is selectively moved up and down in the radial direction according to the rotation direction.

Here, the damper rotation direction refers to a direction in which the rotation speed decreases when the rotor unit 20 rotates under the influence of the damping fluid, and the damper release rotation direction refers to a direction opposite to the damper rotation direction. The first surface 30a on the damper rotation direction side is a surface with which the damping fluid contacts when the wing portion 30 moves in the damper rotation direction, and the second surface 30b moves the wing portion 30 in the damper release rotation direction. At this time, it becomes the surface that the damping fluid contacts.
Specifically, the lower end frame portion of the first surface 30a is provided with an upwardly inclined surface 32 inclined upward as going from the center of the wing portion 30 to the opening direction, and is provided on the upper end frame portion of the second surface 30b. Is provided with a downwardly inclined surface 31 which is inclined downward as going from the center of the wing portion 30 to the closing direction. Accordingly, when the rotor unit 20 rotates in the opening direction, a large pressure is applied to the first surface 30a by the damping fluid. At this time, the upwardly inclined surface 32 reduces the pressure in the closing direction to the inside of the housing 40. The wings 30 connected to the blades 21 are moved upward so as to be in close contact with the inner peripheral side of the housing 40 by being dispersed in the pressure in the direction of the peripheral side and the blades 21 (see FIG. 3).

On the other hand, when the rotor unit 20 rotates in the closing direction, the pressure in the damper rotation direction is applied to the second surface 30b by the damping fluid, so that the downward inclined surface 31 applies the pressure in the opening direction to the rotor unit 20. The wing portion 30 coupled to the blade 21 is moved downward so as to be in close contact with the outer periphery 23 side of the rotor portion 20 (see FIG. 4). .
As described above, the flow resistance of the damping fluid flowing between the end of the wing portion 30 and the inner circumference of the housing 40 changes depending on the rotation direction of the rotating shaft 10, and the attenuation of the rotation speed of the rotating shaft 10 is selected. Can be done

Reference numerals 32a and 31a indicate fluid guide flanges formed at both ends of the upward inclined surface 32 and the downward inclined surface 31, and the fluid guide flanges 32a and 31a press the upward inclined surface 32 and the downward inclined surface 31. The damping fluid is collected on the upward inclined surface 32 and the downward inclined surface 31 side without being spread on both sides of the wing portion 30 and is guided to be pressurized, so that the vertical movement of the wing portion 30 due to the rotation direction is driven more correctly.
The configuration and operation of other conventional rotary damper devices are described in detail in the following prior art, and therefore, further description will be omitted.

According to the rotary damper device as described above, it is applied to an electric rice cooker and the like, and by removing the damper rotating force when the door is closed, the door can be quickly closed with a small force, and when the door is opened, By providing the damper rotation force, instability such as shaking of the main body due to sudden opening of the door can be eliminated.
However, according to the above-mentioned rotary damper device, the rotor, the wing portion, and the stopper, which are composed of different main bodies, must be manually assembled at the correct positions as essential parts, so that not only is it difficult to assemble, but also the work is difficult. There is a problem that the number of steps is increased, and there is a problem that the number of parts to be handled and managed is large.

Republic of Korea Registered Patent Publication No. 10-15182262

  The present invention has been made in order to solve the above problems, the purpose thereof is applied to kitchen appliances such as an electric rice cooker, and slowly rotates in one direction rotation, It is an object of the present invention to provide a rotary door drive device that rotates quickly when rotating in the other direction, in which the number of parts and man-hours are reduced and the assemblability is improved.

  In order to achieve the above object, a rotary door driving device of the present invention has a rotating shaft connected to a rotation damping object, and a blade protruding from an outer periphery of a cylindrical body fixed to one side of the rotating shaft. A rotor part, a housing having a hollow portion filled with the damping fluid and into which the rotor portion is inserted, a wing portion inserted into the hollow portion and moved up and down in the radial direction by the damping fluid, and fixed to one end of the housing. The washer portion for preventing the leakage of the damping fluid to the outside of the hollow portion, and the washer portion are integrated with the washer portion, protruding from the inner surface of the washer portion toward the hollow portion, and combined with the wing portion to form the wing portion. And a stopper washer having a stopper portion for guiding the vertical movement and limiting the rotatable angle of the blade.

Preferably, the stopper has a trapezoidal cross section, and the wing has a concave groove so as to cover the stopper from the outside.
Further, the wing portion may have a trapezoidal cross section, and the stopper portion may have a concave groove shape so as to accommodate the wing portion inside.

  According to the rotary door drive device of the present invention, the rotary door drive device is applied to kitchen appliances such as an electric rice cooker, and rotates slowly when rotating in one direction and quickly rotates when rotating in another direction. The number of parts and man-hours of the device can be reduced, and assemblability can be improved.

It is a perspective view which shows the coupling structure of the conventional rotary damper device. It is an exploded perspective view of the conventional rotary damper device. FIG. 3 is a longitudinal sectional view illustrating an operation of the rotary damper device in FIG. 2 when the rotary damper device is opened. FIG. 3 is a vertical cross-sectional view for explaining an operation when the rotary damper device in FIG. 2 is closed. 1 is a perspective view of a rotary door driving device according to an embodiment of the present invention. 1 is an exploded perspective view of a rotary door driving device according to an embodiment of the present invention. FIG. 7 is a transverse sectional view of the rotary door driving device in FIG. 6. FIG. 7 is an exploded perspective view in which a stopper washer and a wing portion in the rotary door drive device of FIG. 6 are enlarged. FIG. 7 is a longitudinal sectional view of the rotary door driving device in FIG. 6. 7A and 7B are vertical cross-sectional views of the rotary door driving device in FIG. 6, wherein FIG. It is a longitudinal cross-sectional view of the rotary door drive device in FIG. 5, (a) shows the closing start time, (b) shows the closing end time. FIG. 5 is an exploded perspective view of a rotary door driving device according to another embodiment of the present invention. FIG. 13 is an exploded perspective view in which a stopper washer and a wing portion in the rotary door drive device of FIG. 12 are enlarged. FIG. 14 is a longitudinal sectional view of the rotary door driving device in FIG. FIG. 13 is a longitudinal sectional view of the rotary door driving device in FIG. 12, (a) showing a start time of opening, and (b) showing a finish time of opening. FIG. 13 is a longitudinal sectional view of the rotary door driving device in FIG. 12, (a) showing a closing start time, and (b) showing a closing end time.

  Hereinafter, preferred embodiments of a rotary door driving apparatus according to the present invention will be described in detail with reference to the accompanying drawings. The description will be made on the basis of a state in which the rotary door drive device rotates and opens and closes in a vertical direction, and its rotation axis is located on the left side. In this case, the opening direction is the damper rotation direction, and the closing direction is the damper release rotation direction. In addition, an end that is closer to the rotation axis in the radial direction is called a “near end”, and a far end is called a “far end”.

FIG. 5 is a perspective view of a rotary door driving device according to an embodiment of the present invention. FIG. 6 is an exploded perspective view of a rotary door driving device according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view of the rotary door driving device in FIG. FIG. 8 is an enlarged exploded perspective view of a stopper washer and a wing portion in the rotary door drive device of FIG. 6, and FIG. 9 is a longitudinal sectional view of the rotary door drive device of FIG.
As shown in FIGS. 5 to 9, the rotary door driving apparatus according to the embodiment of the present invention includes a rotary shaft 310 and a rotor 320 fixed through the rotary shaft 310, similarly to the above-described prior art. , A wing part 330, a housing 340, a first comb ring 360, a second comb ring 370, and a housing cap 390. Unlike the conventional case, a washer and a stopper as a sealing member are integrally formed. By doing so, the number of parts and man-hours are reduced, and assemblability is improved.

In the above configuration, a hollow portion is provided in the housing 340, and the rotor portion 320 and the wing portion 330 are inserted into the hollow portion. A damping fluid is filled between the outer circumference of the rotor section 320 and the inner circumference of the housing 340, and the damping fluid flows along a gap between the inner circumference of the housing 340 and the far end of the wing section 330, thereby causing rotational damping. Provide power.
At this time, the gap functions as a moving passage of the viscous damping fluid, and the smaller the gap, the larger the damping force that buffers the rotational force. The damping fluid may include not only a hydraulic oil in a liquid state having a viscosity, such as a commonly used oil, but also a gas forming a damping force by atmospheric pressure, in order to form a damping force by viscous flow.

Next, the rotor section 320 is formed of a cylindrical main body fixed to one side of the rotating shaft 310. A knurled portion 312 provided with surface irregularities is provided at the center of the rotating shaft 310, and the knurled portion 312 is also provided on the inner periphery of the rotor portion 320 in order to improve the force of restricting rotation with the knurled portion 312. An unevenness having a shape matching the shape is provided.
At least one, desirably, two blades 321 are protruded from the outer periphery of the rotor portion 320 at a predetermined angle, desirably, 180 degrees along the radial direction and are oppositely symmetric. At this time, both side surfaces of the blade 321 are formed to be inclined at different angles. The outer circumference of the rotor section 320 is further provided with a rotation guide plate 324 connected to one end of the blade 321 and protruding along the circumferential direction, and the rotation guide plate 324 contacts the inner circumference of the housing 340. Then, the rotor section 320 is guided to rotate so that the rotor section 320 operates correctly without flowing to the left and right. The rotation guide plate 324 also serves to seal the damping fluid filled between the housing 340 and the rotor section 320 from leaking outside.

Next, the stopper washer 350 is fixed to the housing cap 390, is provided with a washer portion 355 having a hollow disk shape, and protrudes vertically from the inner surface of the washer portion 355, preferably with a 180-degree interval therebetween. , And a pair of stopper portions 354 protruding in an antisymmetric manner. The stopper part 354 is formed to have a trapezoidal cross section in which the far end face is narrow and the near end face is wide, and both side faces are formed at different angles. Reference numeral 354 a indicates a locking groove formed at an appropriate position of the stopper portion 354 and coupled to the locking protrusion 336 of the wing portion 330.
In the configuration, the stopper portion 354 limits the rotatable angle of the rotor portion 320, and the washer portion 355 is located between the housing 340 and the housing cap 390 to prevent leakage of the damping fluid filled in the housing 340. To prevent. The housing cap 390 is coupled so as to cover an opening surface of a hollow portion formed inside the housing 340. The second comb ring 370 is provided between the housing cap 390 and the washer portion 355, and the first comb ring 360 is provided between the rotation guide plate 324 and the housing 340, and the damping filled in the housing 340 is provided. Prevents external leakage of fluid and wear due to rotational friction of each part.

On the other hand, the wing 330 has a concave cross section so as to cover the stopper 354 from the outside. The proximal end of the first side surface 332, which is the side surface in the opening direction of the wing portion 330, is partially cut to form a first cutout surface 333, whereby the first cutout surface 333 and the rotor portion 320 are formed. A gap 337 in which the damping fluid moves is provided between the outer circumferences.
The first notch surface 333 is desirably formed of an inclined notch surface whose inside is relatively close to the central axis so as to accommodate a large amount of pressure in the far end direction of the damping fluid. A second cutout surface 335 is formed at the far end of the second side surface 334 that is a side surface in the closing direction of the wing portion 330. The second cutout surface 335 is different from the first cutout surface 333, It is desirable that the outer side of the damping fluid has an inclined cut surface relatively close to the central axis so as to accommodate a large amount of pressure toward the near end. As described above, according to the present embodiment, the wing portion 330 is selectively moved up and down in the radial direction depending on the rotation direction of the door.

FIGS. 10A and 10B are longitudinal sectional views at the start and end of opening of the rotary door driving device in FIG. 6, respectively, and FIGS. 11A and 11B are respectively in FIG. It is a longitudinal cross-sectional view at the time of closing start and end time of a rotary door drive device.
First, as shown in FIGS. 10A and 10B, when the rotor section 320 rotates in the opening direction (counterclockwise), the pressure of the damping fluid is applied to the first notch surface 333, and the stopper is stopped. The wing part 330 connected to the part 354 is lifted in the far end direction, so that the wing part 330 comes into close contact with the inner peripheral side of the housing 340. As a result, the flow resistance of the damping fluid flowing between the end of the wing portion 330 and the inner circumference of the housing 340 increases, and the rotation speed of the rotating shaft 310 decreases, that is, the door is gradually opened. .

On the other hand, as shown in FIGS. 11A and 11B, when the rotor unit 320 rotates in the closing direction (clockwise), the pressure of the damping fluid is applied to the second notch surface 335, and the stopper is stopped. The wing part 330 connected to the part 354 is pressed down in the near end direction, and the wing part 330 connected to the stopper part 354 is brought into close contact with the outer peripheral side of the rotor part 320, that is, the end of the wing part 330 and the housing 340. A gap through which the damping fluid moves is formed between the inner circumferences. As a result, the flow resistance of the damping fluid flowing between the end of the wing 330 and the inner periphery of the housing 340 decreases, and the door closes smoothly at a speed proportional to the external force.
As described above, according to the present embodiment, the flow resistance of the damping fluid flowing between the end of the wing portion 330 and the inner circumference of the housing 340 changes according to the rotation direction of the rotating shaft 310, and The rotation speed can be selectively attenuated.

Reference numeral 325 in FIG. 6 indicates a pressure adjustment groove formed along the periphery of the outer peripheral surface of the rotor section 320. The pressure adjustment groove 325 forms a minute gap between the stopper section 354 and the rotor section 320. When the rotating shaft 310 rotates at an excessively high speed and the compression of the damping fluid is excessive, it serves to reduce the pressure so that the damping fluid does not leak out of the housing 340.
FIG. 12 is an exploded perspective view of a rotary door driving device according to another embodiment of the present invention, and FIG. 13 is an exploded perspective view in which a stopper washer and a wing portion in the rotary door driving device of FIG. 12 are enlarged. FIG. 14 is a longitudinal sectional view of the rotary door driving device in FIG. 12, and the same parts as those in FIGS. 5 to 11 are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in FIGS. 12 to 14, in this embodiment, the wing 330 ′ has a trapezoidal shape, contrary to the previous embodiment including the wing 330 having the concave groove 331 shaped to cover the stopper 354. The stopper portion 352 of the stopper washer 350 'is formed so as to have a cross section, and has a concave groove 352a.

More specifically, the wing portion 330 'may be formed to have a trapezoidal cross section having a wide distal end surface and a narrow proximal end surface, and both side surfaces are formed at different angles. The proximal end of the first side surface (opening side surface) of the wing portion 330 'is partially cut to form a first cutout surface 339, and the second side surface of the wing portion 330' (closing direction). A part of the far end of the (side surface) is also cut to form a second cutout surface 338.
The first cutout surface 339 is desirably formed of an inclined cutout surface whose inside is relatively close to the central axis so as to accommodate a large amount of pressure in the far end direction of the damping fluid. On the other hand, unlike the first notch surface 339, the second notch surface 338 has an inclined notch whose outer side is relatively close to the central axis so as to accommodate a large amount of pressure toward the near end of the damping fluid. It is desirable to consist of a surface. Reference numeral 351 indicates a washer unit.

In this embodiment, the stopper section 352 has a concave cross section so that the wing section 330 'is accommodated inside. The stopper portion 352 has a concave groove 352a that is open at the far end, narrow at the near end, and wide at the far end. A flow path through hole 352b communicating with the concave groove 352a is formed at a near end of the first side surface which is a side surface in the opening direction of the concave groove 352a, and a flow path is formed at a far end of the first side surface. Opening 352c is notched. The far end wall of the passage hole 352b is formed of an inclined notch whose inside is relatively close to the central axis so that the inclination direction is the same as the first notch 339 of the wing 330 '. Is desirable.
A notch surface 352d is formed at the far end of the second side surface that is the closing direction side surface of the concave groove 352a, and the notch surface 352d has the same inclination direction as the second notch surface 338 of the wing 330 '. As it is, it is desirable that the outer side be formed by an inclined cut surface relatively closer to the central axis. As a result, a flow path opening 352e is formed between the cutout surface 352d and the inner periphery of the housing 340.

FIGS. 15A and 15B are longitudinal sectional views at the opening start and end points of the rotary door driving device in FIG. 12, respectively, and FIGS. 16A and 16B are respectively in FIG. It is a longitudinal cross-sectional view at the time of closing start and end time of a rotary door drive device.
First, as shown in FIGS. 15A and 15B, when the rotor unit 320 rotates in the opening direction (counterclockwise), the pressure of the damping fluid passes through the passage through holes 352b of the stopper unit 352. Is provided on the first cutout surface 339 of the wing portion 330 ′, whereby the wing portion 330 ′ connected to the stopper portion 352 is lifted in the far end direction, so that the wing portion 330 ′ comes into close contact with the inner peripheral side of the housing 340. Become. As a result, the flow resistance of the damping fluid flowing between the end of the wing 330 'and the inner circumference of the housing 340 increases, and the rotation speed of the rotating shaft 310 decreases, that is, the door is gradually opened. Become.

  On the other hand, as shown in FIGS. 16A and 16B, when the rotor 320 rotates in the closing direction (clockwise), the pressure of the damping fluid passes through the flow path opening 352 e of the stopper 352, The wing portion 330 ′ connected to the stopper portion 352 is pressed down in the proximal direction by the second notch surface 338 of the wing portion 330 ′, whereby the wing portion 330 ′ connected to the stopper portion 352 is pressed. A gap is provided on the outer peripheral side of the rotor section 320, that is, a gap through which the damping fluid moves between the end of the wing section 330 'and the inner periphery of the housing 340. Accordingly, the flow resistance of the damping fluid flowing between the end of the wing portion 330 'and the inner circumference of the housing 340 is reduced, and the door can be closed without difficulty at a speed proportional to the external force.

  Although the preferred embodiment of the rotary door driving device of the present invention has been described above, this is merely an example, and various modifications and changes can be made within the scope of the technical idea of the present invention. Therefore, the scope of the present invention should be determined by the following claims. For example, the rotary door driving device of the present invention can be applied to a left-right or front-rear opening / closing type door system. In some cases, unlike the above-described embodiments, the damper rotation direction can be the closing direction. .

10, 310: rotating shaft 11: polygonal section 12, 312: knurl 20, 320: rotor 21, 321: blade 23: outer periphery (of rotor 20) 24, 324: rotation guide plate 30, 330, 330 ' : Wing part 30a: First surface (on the damper rotation direction side / opening direction side) 30b: Second surface (in the closing direction) 31: Downward inclined surface 31a, 32a: Fluid guide flange 32: Upward inclined surface 40, 340: Housing 41: Seesaw groove 41a: Seesaw projection 42: Inner circumference (of housing 40) 50: Stopper 60, 360: First comb ring 70, 370: Second comb ring 80: Seal member 90, 390: Housing Cap 200: Rotary damper device 205: Fixed holder 205a: Polygonal hole 206: Screw tightening part 210: Torsion spring 2 1: Door coupling extension portion 212: Body coupling extension portion 325: Pressure adjusting groove 331, 352a: Concave groove 332: First side surface 333, 339: First cutout surface 334: Second side surface 335, 338: Second notch surface 336: locking projection 337: crevice 350, 350 ': stopper washer 351, 355: washer portion 352, 354: stopper portion 352b: passage hole 352c, 352e: passage opening 352d: Notched surface 354a: locking groove

Claims (3)

A rotation axis connected to the rotation damping object;
A rotor portion having blades protruding from the outer periphery of a cylindrical body fixed to one side of the rotating shaft,
A housing having a hollow portion filled with damping fluid and into which the rotor portion is inserted;
A wing portion inserted into the hollow portion and moved up and down in a radial direction by the damping fluid,
A washer fixed to one end of the housing, for preventing leakage of damping fluid to the outside of the hollow portion, and integrated with the washer portion, protruding from the inner surface of the washer portion toward the hollow portion, A stopper washer coupled to the wing portion for guiding up and down movement of the wing portion and having a stopper portion for limiting a rotatable angle of the blade.   The rotary door driving device according to claim 1, wherein the stopper has a trapezoidal cross section, and the wing has a concave groove so as to cover the stopper from the outside. . The rotary door drive according to claim 1, wherein the wing section has a trapezoidal cross section, and the stopper section has a concave groove shape so as to receive the wing section inside. apparatus.

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