KR20140099058A - apparatus for rotating damper - Google Patents

Abstract

The present invention provides a rotary damper device which supplies a damping force to effectively reduce the speed of revolution in one direction around a hinge connection unit which is the central axis of a rotary motion and to rapidly restore the speed of revolution in the other direction and has a simple structure, thereby improving the convenience of use and the economic feasibility of production. The rotary damper device comprises a housing having damping fluid filled therein and a stopper protruding from the inner circumferential surface thereof; a blade which is installed on a rotary shaft connected to the central part of the housing, protrudes in a radial direction from between the end thereof and the inner circumferential surface of the housing to supply the damping force to the rotary shaft by using viscous flow of the damping fluid when the rotary shaft rotates, and has a by-pass through hole formed along the circumference thereof; and a rotary plate having a base coupled to surround the rotary shaft and a diaphragm connected to the base to selectively block the by-pass holes.

Description

[0001] Apparatus for rotating damper [0002]

The present invention relates to a rotary damper, and more particularly, to a damping force that effectively decelerates one-way rotation and quickly restores rotation in a hinge connection part serving as a central axis of rotation, And a rotary damper device with improved production economics.

Generally, the door of the hinged type is composed of a door and a door frame to which the door is fixed. At this time, the door is opened and closed by an artificial force, and includes a hinge connection part for smoothly opening and closing the door.

On the other hand, when a door of a refrigerator or a door of a high-rise apartment or an office is suddenly opened or closed, the door and the door frame are severely impacted. Especially, since the atmospheric circulation of the high-rise building is blocked, the open door is strongly closed due to the air pressure difference, and the window that is opened by the external wind pressure is quickly closed.

In this way, the closing of the sudden and strong door not only generates quiet noise, but also the door and the door frame are broken. If the user's hand is caught in the door frame, serious injury may occur. Conventionally, a door damper device has been devised to provide a restoring force when the door is opened and closed to buffer shocks to prevent various safety accidents and product damage.

1 is an exemplary view showing a conventional door damper device.

As shown in FIG. 1, a conventional door damper device 100 includes a link structure 120 and a hydraulic cylinder 110, and is configured to gradually open and close the door with hydraulic pressure. Here, the hydraulic cylinder 110 functions to damp the pressure applied from both sides of the piston to hydraulic pressure, and the link structure 120 is formed so that the door can be maintained in an open state and a closed state through an internal spring structure do.

However, in the conventional door damper device 100, the link structure 120, the hydraulic cylinder 110 and the like are provided on the upper part of the door, but the door damper device 100 is exposed to the outside to deteriorate the appearance. A sponge and a similar porous compensating member are provided in the hydraulic cylinder 110 to maintain the volume of the inside of the cylinder. However, when the compensating member is used for a long period of time, the oil is damaged and durability is degraded .

In addition, when the compensating member repeats compression and decompression, there is a problem that a piece of the compensating member, which is peeled off due to internal pores, is mixed with the oil and blocks the oil passage therein, thereby interfering with the oil flow and generating noise.

In addition to the structure provided to the door and the door frame, a damper device is also provided in the structure of the hinge connection part. However, since the damper device is complicated in the structure of the blade formed by providing the damping force to reduce the impact and the size thereof is increased, the structure of the metal mold is complicated and the productivity is decreased and the manufacturing cost is increased. There is a difficulty in securing a space for installation and a damping force is not sufficient.

Further, the blade formed to resist external force through flow friction in one direction or both directions using oil in a housing formed of a constantly sealed space controls the flow of oil to form a damping force. Therefore, since the internal return charge time of the oil is constant, there is a problem that the ease of use is hindered due to the stiffness when the door is opened and closed.

Further, since the oil inside forms a frictional force between the blade and the housing to cause wear due to frequent friction between the inner members, sludge due to the wear is generated, thereby reducing the structural durability and lowering the reliability of the product .

Korean Registration Practice No. 20-0354593

In order to solve the above-mentioned problems, the present invention provides a damping force that effectively decelerates one-way rotation and quickly restores rotation in a hinge connection part which is a central axis of rotational motion, but has a simple structure, And to provide a rotary damper device with improved production economics.

According to an aspect of the present invention, there is provided a damping device comprising: a housing filled with a damping fluid therein, the stopper protruding from an inner circumferential surface of the housing; Wherein the damping fluid is radially protruded to provide a damping force during rotation of the rotating shaft through a viscous flow of the damping fluid between the end and the inner circumferential surface of the housing, A blade having a through hole formed therein; And a rotating plate including a base portion coupled to surround the rotation shaft, and a diaphragm connected to the base portion to selectively shield the bypass through-hole.

Preferably, the base portion is disposed to be rotationally and slidably moved along an interval between the rotation shaft and the stopper, and both ends of the base portion are provided to have a predetermined spacing angle with the blade.

The cover includes a cover for covering the opened side of the housing and a damping fluid enclosing the damping fluid inside the housing by connecting the inner circumferential end of the housing with the rotation shaft, And a sealing portion formed with a double lip projecting obliquely toward the inside of the housing.

Preferably, the inner circumference of the housing is formed so that the distance from the center of the rotation axis is changed so as to vary the damping effect for each rotation angle corresponding to the end of the blade.

The surface of the diaphragm facing the blade may be provided with a synthetic rubber material that is in close contact with the rim of the bypass through hole to selectively block the flow of the damping fluid.

Through the above-mentioned solution, the rotary damper device of the present invention provides the following effects.

First, not only the rotation speed of the rotary shaft during one-direction rotation can be effectively reduced, but also, when rotating in the other direction, the diaphragm connected to the base portion that surrounds the rotary shaft at a spacing angle is separated from the bypass through- Since the damping fluid is returned through the opened bypass through-hole, the rotating shaft can be quickly returned and rotated, thereby improving the efficiency and usability of the product.

Second, the rotating plate, which selectively shields the bypass through-hole to adjust the damping force, is integrally connected to the diaphragm, and is formed with a simple structure including the rotating shaft so as to be able to be economically produced, Durability can be improved by preventing breakdown due to adhesion of the damping fluid. In addition, the stopper restricts the flow of the damping fluid and can provide a high damping force even if the same viscosity damping fluid is used.

Third, since the inner circumferential surface of the housing is formed so as to change the distance from the center of the rotation shaft, the damping effect can be changed corresponding to the end of the blade, .

1 is an exemplary view showing a conventional door damper device.
2 is a perspective view of a rotary damper device according to an embodiment of the present invention;
3 is an exploded perspective view of a rotary damper device according to an embodiment of the present invention;
4 is a side cross-sectional view of a rotary damper device according to an embodiment of the present invention;
FIGS. 5A, 5B, and 5C are longitudinal sectional views illustrating a state in which a damping fluid flows in one-directional rotation in a rotary damper device according to an embodiment of the present invention. FIG.
FIGS. 6A, 6B, and 6C are vertical sectional views illustrating a state in which a damping fluid flows when the rotary damper device according to the embodiment of the present invention is rotated in the other direction. FIG.
7 is a vertical sectional view showing a modification of the diaphragm in the rotary plate according to the embodiment of the present invention.

Hereinafter, a rotary damper device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Here, the rotary damper device is provided in a hinge connection part serving as a central axis of rotational movement, and has a function of preventing various safety accidents and damage to the product caused by an impact caused by rapid rotation of a rotating object such as a door do. At this time, the hinge connection part includes a hinge connection part which is pivotally moved as a door such as a door or a door of a refrigerator or furniture used as a door or a window in a general building, and a hinge connection part which is rotated up and down like a lid part of an electric rice cooker or a toilet .

FIG. 2 is a perspective view of a rotary damper device according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of a rotary damper device according to an embodiment of the present invention, FIG. 4 is a perspective view of the rotary damper device according to an embodiment of the present invention, Fig.

2 to 3, the rotary damper device 200 according to the present invention includes a housing 210, a driving unit 230 including a blade 232 and a rotary shaft 233, a rotary plate 220, A sealing portion 250, and a housing cap 260. As shown in FIG.

Here, a damping fluid is filled in the housing 210, and a stopper 212 protrudes from the inner circumferential surface of the housing 210. The blade 232 is provided on a rotating shaft 233 coupled to the center of the housing 210 and is connected to the rotating shaft 233 through the viscous flow of the damping fluid between the end of the blade 232 and the inner circumferential surface of the housing 210, Radially to provide a damping force upon rotation of the rotor.

A bypass through hole 231 is formed in the blade 232 along the circumferential direction and a diaphragm 221 is provided on the rotation plate 220 to selectively shield the bypass through hole 231, And a base portion 223 coupled to surround the rotation shaft 233.

The cover 240 and the sealing part 250 are provided on the upper side of the blade 232 to prevent the damping fluid from flowing out and the housing 210 can be closed .

In detail, a rotation shaft 233 connected to the blade 232 is coupled to the hinge connection part (not shown). Here, the hinge connection part is provided for left / right or up-and-down rotation of the object to be rotated, and may be provided in plural for safety of the rotation.

The blade 232 is received in the housing 210 and provides a damping force through the damping fluid flowing between the end of the blade 232 and the inner circumferential surface of the housing 210. The hinge connection part is coupled to the rotation shaft 233 so that the rotation is restricted, and the rotation speed is controlled through the damping force.

Thus, the rotational speed can be adjusted to provide sufficient damping force for damping the impact, thereby improving the usability and compact size, so that it can be installed in a small space without harming the aesthetics.

Of course, the damping fluid includes not only liquid operating oil having viscosity such as oil or grease, which is typically used to form a damping force through viscous flow, but also a gas capable of forming a damping force through air pressure desirable.

The housing 210 includes a blade receiving portion 211, a stopper 212, a cap coupling portion 216, and a rotating shaft supporting portion 214. Here, the housing 210 is formed as a cylindrical column having an open inside and an open side. This can reduce the frictional force when the damping force is provided in connection with the rotational motion and provides an effect of easily molding the inner circumferential surface of the housing 210 into a circular shape.

In addition, the housing 210 is preferably formed of a material such as a synthetic resin having high moisture resistance and heat stability so that it can be used for various industrial products as well as various household goods.

That is, it is possible to prevent the damping force generated by the flow of the damping fluid from being damped by preventing moisture or dust generated in daily life or industrial field from entering into the housing 210, Can be used without limitation in the case of a material having high thermal stability to prevent a change in the shape of the housing 210 due to the leakage of the damping fluid. Furthermore, it is preferable to use a material having high moldability in order to improve productivity.

Of course, the outer circumferential surface of the housing 210 may be formed in an angular shape. Therefore, when the hinge connection portion is installed on one side of the hinge connection portion, the convenience of installation can be improved, and the fixing force can be improved after installation to enhance the reliability of product driving.

In addition, the hinge connection portion and the hinge connection portion may be formed in the shape of a conical column or a polygonal pyramid having different upper and lower cross-sectional areas so as to improve the rationality. However, when formed in the form of a horn, the inner member of the housing 210 is preferably formed in a similar shape for stability of driving.

The blade receiving portion 211 is a receiving space having an inner periphery formed in the circumferential direction so as to be rotatable with the blade 232 inserted into the lower portion of the inner circumferential surface of the housing 210.

At this time, the damping fluid is filled in the blade accommodating portion 211, and the inner circumferential surface of the blade accommodating portion 232 is rotated by the rotation axis 233 so as to change the damping effect for each rotation angle corresponding to the end of the blade 232 Is changed to change the distance from the center thereof.

Specifically, the rotary damper device 200 provides a damping force to the damping fluid flowing in a gap between the end of the blade 232 and the inner circumferential surface of the blade receiving portion 211. Here, the gap functions as a moving path of the damping fluid having a viscosity and a liquid phase, and the damping force for buffering the rotational force increases as the gap is narrowed.

The inner circumferential surface of the blade receiving portion 211 is formed at a narrow gap between the end portions of the blade 232 so as to be spaced apart from the end portion of the blade 232 by a damping portion 211a for raising the damping force And a flow portion 211b formed to reduce the damping force. At this time, the damping portion 211a and the fluid portion 211b are formed in a stepped manner.

As a result, the portion where the damping force acts strongly to reduce the rotational speed and the portion where the damping force acts weakly so as not to affect the rotational speed can be separately formed, so that the rotational speed can be adjusted flexibly according to the application, Can be improved.

Of course, the damping portion 211a and the fluid portion 211b may extend in a smooth curve. The damping portion 211a and the fluid portion 211b may be formed at a plurality of rotational angles to form a damping force to reduce the rotational speed in a stepwise manner. For example, the damping unit, the moving unit, the damping unit, the moving unit, and the like may be disposed in order to reduce the rotational speed of the damping unit.

The stopper 212 protrudes from the inner circumferential surface of the housing 210 to limit the flow of the damping fluid filled in the housing 210. Here, the stopper 212 is formed so as to substantially close the gap with the base portion 223 coupled with the rotation shaft 233. At this time, the substantially closed state means that the damping fluid flowing at the intervals is negligibly small.

The damping fluid can not flow toward the stopper 212 when the blade 232 is pressurized due to the rotation of the blade 232 and is compressed only between the end of the blade 232 and the inner circumferential surface of the housing 210 Thereby forming a damping force. Therefore, the stopper 212 can provide a high damping force even if the damping fluid having the same viscosity is used.

The cap coupling portion 216 is formed on the upper side 213 of the inner periphery of the housing. At this time, the cap engaging portion 216 is provided to elastically insert and fix the engaging protrusion 266 of the housing cap 260 in a groove formed in the circumferential direction along the inner circumference of the housing.

Accordingly, in the process of assembling the inner members to the housing 210, the inner member is temporarily fixed before it is hermetically sealed by the ultrasonic welding, bonding, or rotary welding, so that the damping fluid filled in the housing 210 It is possible to prevent leakage.

In addition, the rotation axis support portion 214 is formed on the lower inner peripheral surface of the housing 210. Here, the rotation axis support part 214 is formed as a groove shaped to fit the shape of the rotation shaft lower end part 234 connected to the blade.

Accordingly, the rotary shaft support part 214 firmly supports the rotary motion of the rotary shaft 233 to improve the structural durability of the rotary damper device 200, and the damping force is effectively transmitted to improve the reliability of the product Can be improved.

Of course, it is also possible that a plurality of fine grooves are formed on the inner circumferential surface of the groove to reduce friction due to the rotation of the rotary shaft 233 and to prevent the rotation shaft lower end 234 from being worn by the friction.

In some cases, an insertion hole may be formed in the lower surface of the housing 210 so that the rotary damper device 200 may be used as an inlet for damping fluid when assembled. At this time, it is preferable that a plurality of insertion holes are formed on the lower surface of the housing 210.

This is because the damping fluid must be injected into the minute gap between the assembled members inside the housing 210, so that the damping fluid is injected into the one insertion hole and the internal air is discharged through the other insertion hole.

The process of inserting the damping fluid into the housing 210 includes a primary injection process, a bubble removal process, a secondary injection process, and a steel ball indentation process. First, in the first injection step, a damping fluid is injected at a certain rate through the insertion hole.

Since air in the atmosphere can be injected into the housing 210 at the time of the first injection process, the bubble removing process is performed. At this time, in the bubble removing process, the blade 232 may be rotated to remove bubbles and fill the damping fluid with the gap of the inner member.

In addition, the damping fluid is injected through a step of injecting the damping fluid into the portion where the bubbles have been removed through the secondary injection process and adjusting the internal pressure to an appropriate level through the steel ball press-fitting step.

The blade 232 is provided on a rotary shaft 233 coupled to a central portion of the housing 210 and rotatably supported by the stopper 212 at a rotational angle limited by the stopper 212 through a viscous flow of the damping fluid. A bypass through hole 231 is formed along the circumferential direction so as to provide a damping force during rotation.

Here, it is preferable that the blade 232 is integrally formed with the rotation shaft 233. At this time, when the blade 232 is coupled with the hinge connection part of the rotation object through the rotation shaft 233 so as to be constrained to rotate, it is possible to prevent the occurrence of twisting or crack due to rotation when the damping force is provided. Or a synthetic resin.

In detail, the blade 232 is formed to protrude from a lower side of the rotation shaft 233 toward the inner circumferential surface of the housing at a predetermined rotation angle. At this time, the blade 232 is formed in a conical shape so that the damping fluid flows between the radial end and the inner circumferential surface of the housing 210, and both sides can effectively press the damping fluid.

Of course, the radial end may be formed at a rotation angle of 80 to 120 degrees depending on the viscosity of the damping fluid. At this time, it is preferable that the radial end of the blade 232 protrudes at a rotation angle of 90 degrees so as to maximize the damping force through the flow of the damping fluid.

The bypass through-holes 231 are formed to penetrate the blades 232 along the circumferential direction, and a plurality of through-holes 231 may be provided depending on the thickness of the blades 232. At this time, the damping fluid can selectively flow through the bypass through-hole 231.

The bypass through-hole 231 may be formed as a straight pipe connecting both side ends of the blade 232. Therefore, the productivity can be improved due to the simplicity of the molding, and the damping fluid can provide an effect of reducing the resistance force when the bypass through-hole 231 flows past.

This prevents the damping fluid from being adhered to the inside of the bypass through-hole 231, prevents the damping fluid from sticking to the inside of the bypass through-hole 231, The shielding force is maintained constantly, so that the structural durability can be improved.

Further, the rotation shaft 233 functions as a central axis of the rotational motion of the blade 232. The upper end of the rotation shaft 233 extends to the outside of the housing 210 and a connection groove 235 is formed in the lower end of the rotation shaft 234, And can be assembled to the hinge connection portion. Accordingly, the hinge connection part can be operated such that the rotation of the hinge connection part is restricted by the rotation shaft 233, so that the rotation speed is controlled through the damping force.

The rotating plate 220 includes a base portion 223 coupled to surround the rotation shaft and a diaphragm 221 connected to the base portion 223 to selectively block the bypass hole 231. [ ).

The base portion 223 is disposed to be rotationally and slidably moved along the interval between the rotation shaft 233 and the stopper 212. Both ends 223a and 223b of the base portion 223 are connected to the blade 232 ) And a predetermined spacing angle ([theta]).

More specifically, the base portion 223 is connected to the diaphragm 221 and extends at a predetermined angle so as to surround the lower side of the rotation shaft 233, and an extended end portion 223a extends from the side of the blade 232 And is spaced apart from the adjacent side surface by a predetermined distance.

The both ends 223a and 223b of the base portion 223 have a predetermined separation angle θ with the side surface of the blade 232 and the separation angle θ when the blade 232 rotates, The blade 232 and the rotary plate 220 are rotated separately.

When the blade 232 rotates in one direction (counterclockwise in FIG. 5A) outside the spacing angle?, An adjacent one side of the blade 232 is connected to one end 223b of the base, And the other side surface of the blade 232 is in contact with the other end 223a of the base portion 223 to rotate the blade 232 in the clockwise direction in FIG. . At this time, the rotation plate 220 is rotated along the blade 232.

Since the diaphragm 221 stops influenced by the viscosity of the damping fluid when the blade 232 is rotated in one direction, the diaphragm 221 contacts the adjacent one side of the blade 232, The pass through hole 231 is closed. The other side of the blade 232 contacts the one end portion 223b of the base portion and transmits a rotational force and is simultaneously rotated.

On the other hand, the diaphragm 221 is pressed through the damping fluid flowing into the bypass through-hole 231 within the separation angle &thetas; The bypass through-hole 231 is opened. The side surface of the blade 232 contacts the other end portion 223a of the base portion to transmit a rotational force, and is rotated while maintaining a spacing angle?.

As such, the diaphragm 221 can selectively block the bypass through-hole 231 through the pressure of the damping fluid and the pressure of the damping fluid and the selective rotation of the base 223 . Accordingly, the one-way rotation speed of the hinge connection part is effectively reduced, but the damping fluid is quickly returned to smoothly rotate the hinge connection part in the other direction, thereby providing ease of use.

In addition, the rotation plate 220, which selectively shields the bypass through-hole 231 and adjusts the damping force, is formed in a very simple structure to provide easiness in manufacturing a mold, thereby improving productivity, It is possible to prevent the breakdown due to the adhesion of the fluid and to improve the durability of the structure.

4, the cover 240, the sealing part 250, and the housing cap 260 are formed in a series of structures for sealing the inner space of the housing 210 from the external environment, (Not shown).

Here, the cover 240 is formed to cover one open side of the housing 210. At this time, the cover part 240 is provided on the upper side of the blade 232 to cover the upper side of the blade receiving part 211 to form a space for filling the damping fluid. And, the damping fluid flows in the space to form a damping force. In addition, the rotation shaft 233 is coupled to the center of the cover part 240 so as to pass therethrough.

Of course, the gap between the lower end surface of the cover portion 240 and the upper end surface of the blade 232 is substantially closed so that the damping fluid flows at the gap and does not affect the damping force formed through the blade desirable.

Therefore, it is preferable that the cover portion 240 is formed of a material which is resistant to abrasion due to direct contact with the blade 232 and which is less deformed due to external pressure, while using a very small amount of damping fluid as a lubricant.

The sealing part 250 includes a first lip 251, a second lip 252, an iron core 253, and a recessed groove 254. The sealing part 250 is provided to seal the damping fluid inside the housing 210 by connecting the inner circumferential end of the housing 210 with the rotation shaft 233, A pair of ribs 251 and 252 are formed to protrude obliquely to the inside of the housing 210.

In detail, the sealing part 250 is provided on the upper side of the cover part 240. At this time, the sealing part 250 is formed so as to have a shape in which the outer circumferential edge of the sealing part 250 cooperates with the inner circumferential end of the one side of the opening of the housing 210, and the center part is connected to the rotating shaft 233. The sealing part 250 supports the cover part 240 on the upper side so that the cover part 240 is pressed by the upward and downward pressure of the damping fluid generated by the rotation of the blade 232 So as to prevent it from deviating in the upward direction of the housing 210.

The recessed groove 254 is formed on the outer periphery of the sealing part 250 to form a frictional force with the inner peripheral surface of the housing 210. Therefore, the sealing part 250 can improve the separation preventing force of the cover part 240.

The first lip 251 and the second lip 252 are formed at a portion where the sealing portion 250 is connected to the rotation shaft 233 and are formed so as to be inclined to the inside of the housing 210 . At this time, the first lip 251 and the second lip 252 prevent the damping fluid filling the inside of the housing 210 from leaking to the outside.

In addition, the double lip structure can reduce the frictional cross-sectional area by changing the contact with the rotation shaft 233 to a line contact rather than a surface contact. Therefore, abrasion of the sealing part 250 due to rotation of the rotation shaft 233 is prevented, and the leakage preventing structure can be continuously maintained.

Further, in forming the damping force through the blade 232, the frictional force between the rotating shaft 233 and the sealing part 250 can be prevented from being influenced, thereby improving the reliability of the product.

The iron core 253 is formed on the inner side of the sealing part 250 to function to support the shape of the protrusive groove 254 and the first lip 251 and the second lip 252 . Therefore, the sealing part 250 is formed of a material having an elastic force, so that the shape of supporting the cover part 240 can be maintained even if the shielding force is enhanced.

The housing cap 260 is provided on the upper side of the sealing part 250. A coupling protrusion 266 is formed on the upper side of the housing cap 260 to connect the cap coupling part 216, respectively. Accordingly, the housing cap 260 may be temporarily fixed before the housing cap 260 is sealed by ultrasonic welding, bonding, or rotary welding in the process of assembling the inner member to the housing 210, And the efficiency of the assembling process can be improved.

Hereinafter, the driving in which the damping force changes in the housing 210 by forming the blade 232 and the rotation plate 220 by separating or engaging with each other through the separation angle? Will be described in more detail. same.

5A, 5B and 5C are longitudinal sectional views showing a state in which a damping fluid flows in one direction rotation in a rotary damper device according to an embodiment of the present invention. FIGS. 6A, 6B and 6C are cross- FIG. 2 is a longitudinal sectional view showing a state in which a damping fluid flows when the rotary damper device is rotated in the other direction. Here, the blade 232 defines the blade receiving portion 211 together with the stopper 212. In this case, the partition does not mean that it is divided into a completely separated space but is used to mean that the damping fluid is divided so as to flow from the separated space to the other space.

5A, when the blade 232 rotates in one direction (counterclockwise in FIG. 5A), the diaphragm 221 is separated from the blade 232 in a state where the diaphragm 221 is separated from the blade 232 And is not rotated due to the viscosity of the damping fluid. Since the base 223 is spaced apart from the adjacent side of the base 232 by the separation angle?, The base 232 does not receive the rotational force of the blade 232. Accordingly, only the blade 232 rotates in one direction so that the diaphragm 221 shields the bypass through-hole 231.

Since the damping fluid is pressurized by the blade 232 and the flow of the damping fluid is limited by the stopper 212, the damping fluid in the clockwise direction of the blade 232 in the counterclockwise compartment space of the blade 232 And flows into the compartment space. The upper end of the blade 232 is covered by the cover 240 and the lower end of the blade 232 is covered by the housing 210.

At this time, the gap between the upper end surface of the blade 232 and the lower end surface of the cover 240, the blade 232, and the housing 210 is substantially closed to prevent the damping fluid from flowing, Only a small amount of damping fluid is present to serve as a lubricant when the blade 232 rotates.

The gap between the stopper 212 and the base portion 223 is also substantially closed. Here, the substantially enclosed means that the damping fluid flows through the gap and does not affect the damping force formed through the blade 232. At this time, only a very small amount of damping fluid may be introduced into the gap and used as a lubricant to reduce frictional force when rotating between the stopper 212 and the base portion 223.

Accordingly, the damping fluid flows between the inner peripheral surface of the housing 210 and the end of the blade 232 to form a damping force. At this time, the blade 232 forms a weak damping force by a wide interval when it is rotated by the moving portion 211b and forms a strong damping force by a narrow interval when it is rotated by the damping portion 211a do.

5b, when the blade 232 is rotated in the damping portion 211a in one direction, the diaphragm 221 is pressed against the pressure of the damping fluid acting in the other direction and the end of the blade 232 The through hole 231 is kept in the closed state by being in contact with the side surface of the blade 232 due to the flow of the damping fluid flowing between the inner surface of the housing 210 and the inner circumferential surface of the housing 210. Accordingly, the damping fluid may flow between the end of the blade 232 and the inner circumferential surface of the housing 210 to provide a strong damping force.

5C, the blade 232 is driven to decelerate the rotation speed with a strong damping force until the rotation of the blade 232 is restricted by the stopper 212. As shown in FIG.

When the blade 232 rotates in the clockwise direction to be separated from the diaphragm 221 and is rotated counterclockwise in a state where the blade 232 can not completely escape from the damping portion 211a, the damping fluid is damped Through hole 231 which flows at a lower pressure than the narrow gap of the portion 211a.

At this time, a damping fluid flow centering on the bypass through-hole 231 is generated in the counterclockwise partition space of the blade 232 in the clockwise partition space, so that the diaphragm 221 is influenced by the flow, And moves toward the blade 232 side. Therefore, the bypass through-hole 231 can be shielded more quickly.

6A, when the blade 232 rotates in the other direction (clockwise direction in FIG. 5A), the blade 232 and the diaphragm 221 are in close contact with each other, Since the end portion 223a is separated from the adjacent side of the blade 232 by an angle of separation [theta], the rotational force of the blade 232 is not received in the other direction. Accordingly, only the blade 232 rotates in the other direction, and the diaphragm 221 opens the bypass through-hole 231. [

In addition, due to the pressure of the damping fluid flowing through the bypass through-hole 231 into the counterclockwise partition space of the blade 232 in the clockwise partition space of the blade 232, And can be more easily spaced from the blade 232.

Accordingly, the blade 232 rotates at a narrow gap of the damping portion 211a, but the damping fluid can be quickly returned through the bypass through-hole 231, thereby forming a weak damping force. Therefore, the blade 232 can be easily rotated in the other direction.

Referring to FIG. 6B, the blade 232 rotates in the other direction while maintaining a separation angle? From the base portion 223. The gap between the end of the diaphragm 221 and the inner circumferential surface of the housing 210 may be formed to be wide enough to allow the damping fluid to flow easily so as not to affect the rotation of the blade 232 in the other direction.

Thereafter, as shown in FIG. 6C, the blade 232 rotates in the other direction in the fluid 211b. At this time, the damping fluid flows into the bypass through-hole 231 and flows at a wide interval between the end of the blade 232 and the inner circumferential surface of the housing 210 to form a weak damping force.

7 is a longitudinal sectional view showing a modification of the diaphragm in the rotary plate according to the embodiment of the present invention.

As shown in FIG. 7, the basic configuration of the rotation plate 320 except for the diaphragm 321 is the same as that of the above-described embodiment, and thus a detailed description of the same configuration will be omitted.

Here, a surface of the rotary plate 320 facing the blade 332 in the diaphragm 321 is made of a synthetic rubber material which is closely attached to the rim of the bypass through hole 331 to selectively block the flow of the damping fluid A blocking film 329 is provided.

At this time, when the blade 323 rotates counterclockwise and the diaphragm 321 contacts the side surface of the blade 332 to shield the bypass through-hole 331, It is formed of a synthetic rubber material and is tightly adhered to the bypass through-hole 331 to improve the sealing performance.

Therefore, the damping fluid is prevented from flowing between the bypass through-hole 331 and the diaphragm 321 to reduce the damping force, thereby improving the structural reliability of the rotary damper device 300.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100: Conventional damper device 110: Hydraulic cylinder
120: Link structure 200, 300: Rotational damping device
210, 310: housing 211, 311:
211a, 311a: damping parts 211b, 311b:
212, 312: stopper 213: upper side of the inner circumference of the housing
214: rotating shaft support part 216: cap coupling part
220, 320: rotation plate 221, 321: diaphragm
223, 323: base portion 230, 330:
231, 331: Bypass through hole 232, 332: Blade
233, 333: rotation shaft 234:
235: connection groove 240: cover part
250: sealing part 251: first lip
252: second lip 253: iron core
254: recessed groove 260: housing cap
266: engaging projection 329:
θ: separation angle

Claims (5)

A housing in which a damping fluid is filled, and a stopper protrudes from the inner peripheral surface;
Wherein the damping fluid is radially protruded to provide a damping force during rotation of the rotating shaft through a viscous flow of the damping fluid between the end and the inner circumferential surface of the housing, A blade having a through hole formed therein; And
And a rotating plate including a base portion coupled to surround the rotation shaft, and a diaphragm connected to the base portion to selectively shield the bypass through-hole. The method according to claim 1,
Wherein the base portion is disposed so as to be rotationally and slidably moved along an interval between the rotation shaft and the stopper, and both end portions of the base portion are provided to have a predetermined spacing angle with the blade. The method according to claim 1,
A cover portion covering one opened side of the housing,
And a sealing part having a double lip protruding obliquely toward the inside of the housing at a portion connected to the rotation shaft to seal the damping fluid inside the housing by connecting the inner circumferential end of the housing to the rotation shaft, And the rotation damper device. The method according to claim 1,
Wherein the inner peripheral surface of the housing is formed such that a distance from the center of the rotation axis is changed so as to change the damping effect for each rotation angle corresponding to the end of the blade. The method according to claim 1,
Wherein a surface of the diaphragm opposite to the blade is provided with a synthetic rubber material barrier which is in close contact with a rim of the bypass through hole to selectively block the flow of the damping fluid.

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