WO2017122992A1

WO2017122992A1 - Variable damper for washing machine and multi-stage integrated friction damper

Info

Publication number: WO2017122992A1
Application number: PCT/KR2017/000341
Authority: WO
Inventors: 선철곤
Original assignee: 주식회사 썬 프레인 코; 선철곤
Priority date: 2016-01-11
Filing date: 2017-01-10
Publication date: 2017-07-20

Abstract

The present invention relates to a variable damper for a washing machine and a multi-stage integrated friction damper, and comprises: a tube (1) that is open at one end thereof and has an internal space formed therein; and a rod (30) having one end located in the tube (1) through the opening of the tube (1) and an opposite end exposed to the outside, wherein the rod (30) includes: a small-diameter part (34) located in the tube (1) and having a piston (30) mounted on the outer circumferential surface thereof; and a large-diameter part (35) having a larger diameter than the small-diameter part (34), a part of the large-diameter part (35) being exposed to the outside, wherein a separation preventing piece (36) is formed on an end portion of the small-diameter part (34) to prevent the piston (30) from being separated. According to the present invention, the variable damper for a washing machine and the multi-stage integrated friction damper, which have enhanced air damping capacity, are remarkably advantageous in that a friction member is coupled to the outer circumferential surface of the piston, which reciprocates in the tube, to absorb vibration of the piston, thereby increasing the lifetime of the air damper and enabling the air damper to operate smoothly.

Description

Variable damper and multi-stage friction damper for washing machine

The present invention relates to a variable damper for a washing machine and a multi-stage integrated friction damper, and more particularly, to a variable damper for a washing machine and a multi-stage integrated friction damper that absorb vibrations caused by drum rotation of the washing machine.

In general, a washing machine is a device for washing and dehydrating a certain amount of laundry to be washed, and repeatedly washes and washes laundry.

Such a washing machine has a method of injecting laundry from an upper part of a case and a drum method of injecting laundry from a side part. In general, a drum type washing machine includes a cabinet forming an exterior, a tub installed inside the cabinet to store water, and a drum rotatably installed inside the tub and rotating by receiving a rotational force of a motor. The laundry and laundry are put in the tub together with the detergent and the drum is rotated to apply a physical impact to the laundry to wash the laundry.

In this way, the washing machine is inevitably generated by the rotation because the drum mounted therein is driven by the motor to operate while rotating. In addition, the laundry accommodated in the drum and washed is not fixed at a fixed position or evenly distributed. As a result, vibrations are further generated by the unbalanced mass of the laundry. Excessive vibration may cause play or cause malfunction of various devices installed inside the washing machine, and thus have an important effect on the life of the washing machine, and also become a major cause of noise generated by the washing machine.

In order to reduce vibration and reduce noise caused by drum rotation during washing and unbalanced mass of laundry inside the drum, a plurality of elastic means for supporting the tub are generally installed between the upper surface of the cabinet and the upper surface of the tub in the washing machine. The damper is provided between the inner side of the lower surface of the cabinet and the lower side of the outer circumferential surface of the tub.

According to the prior art, Korean Patent No. 10-1130785 (Magnet Friction Damper for Drum Washing Machine), the drum friction damper for drum washing machine reduces vibration and noise by using a metal bearing for forming a magnetic flux density with a spring. The present invention relates to a magnet friction damper of a drum washing machine, which is economical because it eliminates the use of expensive magnetic fluids and eliminates the need for a fluid leakage prevention structure, and is a magnet friction damper having excellent operation reliability of the solenoid and good vibration damping force. In order to reduce the vibration and noise generated in the drum washing machine, the drum is mounted between the tub and the inner wall of the washing machine cabinet, the cylinder having a hollow inside, one end is introduced into the cylinder and the other end is outside the cylinder Extending rods, bobbins through the central part The first and second solenoids, which are composed of a wound solenoid coil and are spaced vertically apart from the inside of the cylinder, between the lower end of the first solenoid and the first and second solenoids, and the upper end of the second solenoid. And first to third cores disposed respectively, first to third metal bearings mounted between an outer circumferential surface of the rod and an inner circumferential surface of the first to third cores, and springs mounted between the cylinder and the rod. Disclosed is a magnet friction damper for a drum washing machine.

According to another prior art, the registered patent No. 10-0691879 (damper of the washing machine), the damper of the washing machine is one end is inserted into the cylinder of the hollow cylinder connected to either side of the tub and the case The other end is connected to any other side of the tub and the case, one end of the piston body is provided with a friction member on the outer periphery is inserted into the piston body, the other end is formed at the end of the end of the extension end engaging bar is formed The other end of the friction member is movable in the engagement end, the other friction member is shrink-molded at the end of the friction ring of the friction ring contacting the inner circumferential surface, and is located between the end of the engaging end and the piston body and Friction ring movable end for engaging the end portion of the piston body is formed on the outer circumference of the friction ring friction action with the cylinder It has also been described that includes another friction member to perform.

However, the conventional apparatus has a problem in that the damper does not attenuate the vibration by using a damper by a coil spring having a constant damping force even with a change in the rotational speed of the drum, but transmits the vibration to the cabinet of the washing machine.

Therefore, the present invention has been made to solve the above problems, the present invention, the friction body of the piston coupled to the rod is a low damping force in a certain section according to the linear reciprocating movement of the rod, the rest of the section when the withdrawal of the rod The present invention relates to a variable damper for a washing machine, in which a friction body greatly increases damping force while linearly reciprocating along an inclined surface of a sleeve to absorb vibration generated by drum rotation of a washing machine.

In the present invention, a variable damper for a washing machine includes a tubular tube (10) and a piston (20) inserted into the tube (10) and linearly reciprocating in a damper for a washing machine that absorbs vibration generated by drum rotation of the washing machine. And a rod 30 coupled to an end of the piston 20 and partially exposed to the outside of the tube 10, and a bush 40 guiding the movement of the rod 30. The diameter of the rod 30 of the portion engaged with the piston 20 in the 10 is characterized in that the piston fastening portion 31 is formed to be smaller than the portion exposed outside the tube 10.

In addition, the multi-stage integrated friction damper of the present invention is a damper for a washing machine that absorbs vibration generated by drum rotation of a washing machine, the tube 10 having one end opening and an internal space formed therein, and an opening of the tube 10. Through one end is located inside, the other end is composed of a rod 30 that is exposed to the outside, the rod 30 is located inside the tube 10, the small diameter that the piston 30 is mounted on the outer periphery It consists of a small diameter portion 134 and a larger diameter portion 135 is formed larger than the diameter of the small diameter portion 134, a portion of which is exposed to the outside, the piston 20 at the end of the small diameter portion 134 ) Is characterized in that the separation preventing piece 136 is formed so as not to be separated.

Therefore, in the present invention, the friction body of the piston coupled to the rod has a low damping force in certain sections according to the linear reciprocation of the rod, and the rest of the section has a damping force while the friction body linearly reciprocates along the inclined surface of the sleeve when the rod is pulled out. There is a remarkable effect of greatly increasing the absorption of the vibration generated by the drum rotation of the washing machine.

1 is a cross-sectional view of the variable damper for the present invention washing machine.

Figure 2 is a detailed exploded view of the piston and the rod of the variable damper for washing machine of the present invention.

Figure 3 is a graph showing the number of revolutions and the magnitude of vibration for the use time of the damper of the present invention.

Figure 4 is a graph of the damping force sine curve of the damper of the present invention.

5 is a cross-sectional view showing a state in which a plurality of friction bodies of the present invention are disposed.

6 is a sectional view of a conventional damper for a washing machine.

7 is a cross-sectional view of an embodiment of a variable damper for a washing machine of the present invention.

8 is a cross-sectional view of the multi-stage integrated friction damper of the present invention.

9 is a cross-sectional view of another embodiment of the multi-stage integrated friction damper of the present invention.

10 is a cross-sectional view of another embodiment of the multi-stage integrated friction damper of the present invention.

11 is a cross-sectional view showing a state where a friction piece is formed in a large diameter portion of the rod of the present invention.

Figure 12 is a schematic diagram showing a state in which a bushing is mounted on the friction body of the present invention.

Figure 13 is a cross-sectional view showing a state in which the packing is coupled to the lower guide in the present invention.

14 is a detailed schematic view showing a state in which the rod and the rod assembly fastener of the present invention is coupled.

15 is a general hysteresis curve graph with damping force.

16 is a hysteresis curve graph applying a friction material and an elastic material for a variable damping force.

10. Tube

20. Piston

21. First stopper 22. Sleeve

23. 2nd stopper 24. Washer

25. Fastening Part 26. Friction Body

26-1. Mounting groove 27. Friction material

28. Tension ring 29. Tightening groove

30. Load

31.Piston Joint 40.Bush

112. Fasteners 117. Stopper 118. Air Hole

121. Friction body 122. Tightening groove 123. Friction material

124. Bushing

131.Air damper hole 132. Through hole 133. Projection

134. Small Diameter 135. Large Diameter 135-1. Friction piece

136. Breakaway prevention piece 137. Stopper fastening groove

141.Upper Guide

150. Damping force variable friction material

160. Rod assembly 161. Protrusion groove

P. Packing T. Elastic Material

In addition, the piston 20 is fastened to the piston fastening portion 31 of the rod 30 is the first stopper 21, the sleeve 22, the second stopper 23, the washer 24, the fixed fastening portion ( 25) is fastened in order, characterized in that the friction body 26 is fastened to the sleeve 22.

In addition, the friction body 26 is divided into a plurality of fastening radially along the outer circumference of the sleeve 22, the mounting groove 26-1 is formed on the outer circumference of the friction body 26, the friction material 27 ) Is mounted, and the surfaces in which the sleeve 22 and the friction body 26 contact each other are inclined with each other.

In addition, the lower portion of the tube 10 is molded in a circular seal, the upper portion is reduced in the outer diameter through a shaft tube (縮管) process so that the head of the bush (40) can be fitted to one end of the tube (10) In addition, the periphery of the tube 40 is inclined to the shape of the bush 40 so that the bush 40 and the tube 10 are firmly coupled without a separate coupling means, and also have a damping function by air, and the friction material 27 By the addition of the slip phenomenon can be prevented.

Hereinafter, the variable damper and multi-stage integrated friction damper for the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a variable damper for a washing machine of the present invention, FIG. 2 is a detailed exploded view of a piston and a rod of the variable damper for a washing machine of the present invention, FIG. 3 is a graph showing the number of revolutions and the vibration of the washing machine using time of the damper of the present invention. 4 is a curve graph of damping force of the damper of the present invention, FIG. 5 is a cross-sectional view showing a state in which a plurality of friction bodies of the present invention are arranged, FIG. 6 is a cross-sectional view of a conventional damper for a washing machine, and FIG. 7 is an implementation of a variable damper for a washing machine of the present invention. 8 is a cross-sectional view of the multistage integral friction damper of the present invention, FIG. 9 is a cross-sectional view of another embodiment of the multistage integral friction damper of the present invention, FIG. 10 is a cross-sectional view of another embodiment of the multistage integral friction damper of the present invention, and FIG. Sectional drawing which shows the state in which the friction piece was formed in the large diameter part of the invention rod, FIG. 12 is a schematic diagram which shows the state in which the bushing was attached to the friction body of this invention, FIG. 14 is a detailed schematic view showing a state in which a rod is coupled to a rod assembly, FIG. 15 is a general hysteresis curve graph having damping force, and FIG. Hysteresis curve graph applying friction material and elastic material.

The variable damper for a washing machine of the present invention includes a tubular tube (10) and a piston (20) inserted into the tube (10) and linearly reciprocating in a damper for a washing machine that absorbs vibration generated by drum rotation of the washing machine. ), A rod 30 coupled to the end of the piston 20 and partially exposed to the outside of the tube 10, and a bush 40 to guide the movement of the rod 30.

The diameter of the rod 30 of the portion engaged with the piston 20 in the tube is smaller than the portion exposed outside the tube 10 to form a piston fastening portion 31.

The piston 20 includes a first stopper 21, a sleeve 22, a second stopper 23, a washer 24, and a fastening portion.

And the piston 20 is fastened to the piston fastening portion of the rod is fastened in the order of the first stopper, the sleeve, the second stopper, the washer, the fastening portion, the friction body 26 is fastened to the sleeve.

That is, the piston 20 will be described in detail as shown in FIG. 1 as follows.

The first stopper 21 is formed in a ring shape, the first stopper is formed of a single layer, the lower end of the first stopper is formed longer than the upper end diameter.

An elastic material T is coupled to an upper surface of the lower end of the first stopper in contact with the friction body.

The upper limb second stopper is formed in a ring shape, the first stopper is formed in a single layer, the upper end of the second stopper is formed longer than the lower end diameter.

An elastic material T is coupled to upper and lower ends of the second stopper in contact with the friction body.

At this time, the lower end of the second stopper and the upper end of the first stopper have the same diameter.

And the sleeve 22 is fastened to the piston fastening portion of the rod, the first stopper and the second stopper is fastened, the lower end of the sleeve is the same diameter as the upper end of the first stopper, the upper end of the sleeve The diameter is longer than the lower end of the second stopper.

That is, the outer periphery of the sleeve is formed in a cylindrical shape inclined downward.

In addition, the outer periphery of the sleeve is fastened to the friction body 26 is moved in the longitudinal direction of the sleeve while being fastened to the sleeve is fastened.

The friction body 26 is formed of a plurality, and is fastened at a predetermined interval along the outer periphery of the sleeve, the mounting groove 26-1 is formed on the outer periphery of the friction body 26, the friction material 27 is The surfaces on which the sleeve 22 and the friction body 26 contact each other are inclined.

The plurality of friction bodies are positioned to radially contact the outer circumference of the sleeve while maintaining a predetermined distance from each other, and are fastened by a tension ring 28.

That is, a fastening groove 29 into which a tension ring can be inserted is formed at the outer circumference of the mounting groove of the friction body, and the plurality of friction bodies are fastened to the outer circumference of the sleeve by inserting the tension ring into the fastening groove. Will be.

In addition, the friction body coupled to the friction material is linearly reciprocated along the inclined surface of the sleeve between the first stopper and the second stopper while being fastened to the sleeve during the straight reciprocation of the rod.

That is, when the rod is moved in the outward direction of the tube, the plurality of friction bodies are moved in the direction in which the second stopper is located along the inclined surface of the sleeve. On the contrary, when the rod is moved in the inward direction of the tube, the plurality of friction bodies are inclined surface of the sleeve. Along the direction of movement of the first stopper.

At this time, when the plurality of friction bodies moving along the inclined surface of the sleeve moves in the direction of the first stopper, the plurality of friction bodies arranged radially become narrower with each other, and conversely, the plurality of friction bodies move in the direction of the second stopper. When the plurality of friction bodies arranged radially, the distance between them becomes wider.

In more detail, as shown in Figure 3, showing the rpm and vibration of the washing tank with respect to the operating time of the washing machine, section b, which is the vibration of the time when the operation of the washing machine starts and the operation ends This vibration is the highest vibration section, and the section a, the operating time of the washing machine, is the low vibration section with the least vibration and is the resonance section.

That is, in section a of FIG. 3, a small damping force is required, and the narrower the distance between the friction bodies is, the lower the damping force is, which is very advantageous to absorb a small vibration.

In the section b of FIG. 3, a large damping force is required, so that the greater the distance between the friction bodies is, the higher the damping force is, which is very advantageous for absorbing large vibrations.

In addition, as shown in Figure 4, the damping force of the damper is a curve of the damping force of the rod stroke distance a _s section and the low damping force a _n section is a low vibration section (resonance section) pointing to the section a of Figure 3 absorbs low vibration, Stroke distance b _s of rod and b _n with high damping force The section indicates a section b of FIG. 3, which is a start and end section of the washing process, and is a variable structure that absorbs high vibration.

In addition, a of FIG. 5 indicates a low vibration section (resonance section), which indicates that the distance between the plurality of friction bodies is separated from each other.

That is, a of FIG. 5 is very effective in absorbing low vibration by realizing a value of FIG. 4 while maintaining a low damping force in a section of FIG.

In addition, b of FIG. 5 indicates a high vibration section, and indicates that the distance between the plurality of friction bodies spaced apart from each other is widened.

That is, b of FIG. 5 maintains a high damping force in the b section of FIG. 1 to implement b value of FIG. 4 and is very effective in absorbing high vibration.

In addition, the present invention, while a plurality of friction bodies are fastened to the sleeve to move the reciprocating linearly while absorbing the vibration, the conventional damper for a washing machine shown in Figure 6 absorbs the vibration of the washing machine only with an elastic material to vibrate compared to the present invention Could not absorb much.

In addition, as another embodiment, as shown in FIG. 7, the rod 30 and the sleeve 22 may be integrally manufactured.

That is, the diameter of the rod 30 of the portion coupled to the piston 20 in the tube is formed smaller than the portion exposed outside the tube 10, the outer periphery of the rod formed of the diameter is close to the end of the rod The larger the diameter is formed so that the inclined surface is formed.

A washer is mounted at the end of the rod, and the washer is fastened by a fastening part.

In addition, the friction body is coupled to the rod formed with the inclined surface, the friction body 26 is composed of a plurality, is fastened at a predetermined interval along the outer circumference of the sleeve.

In the outer circumference of the friction body 26, a mounting groove 26-1 is formed, and the friction material 27 is mounted.

The contact surface of the friction body in contact with the inclined surface of the rod is inclined so as to be linearly reciprocated along the inclined surface of the rod.

The plurality of friction bodies are positioned to radially contact the outer circumference of the rod while maintaining a constant distance from each other, and are fastened by a tension ring 28.

That is, a fastening groove 29 into which a tension ring can be inserted is formed in the outer circumference of the mounting groove of the friction body, and the plurality of friction bodies are inclined outer circumference of the rod by inserting the tension ring into the fastening groove. Will be fastened to.

Further, the friction body combined with the friction material is linearly reciprocated along the inclined surface of the rod while being fastened to the inclined surface of the rod during the linear reciprocation of the rod.

In addition, an elastic material is coupled to the washer and the rod in contact with the friction body while linearly reciprocating.

On the other hand, the tube used in the present invention is manufactured by a method of sealing by forming a lower portion in a circular state in the open state on both sides using the carbon steel pipe (STKM) for the mechanical structure, the upper portion of the bush through the shaft tube process to be fitted with the bush It is characterized by a reduced size.

That is, the conventional air damper tube is formed of a synthetic resin material such as plastic by the injection process, in the case of such a tube is a severe thermal expansion due to the temperature difference, the change of the damping force is severe.

In addition, if the service environment deteriorates rapidly, such as exposure to direct sunlight for a long time, the life is sharply lowered, but the tube according to the present invention is formed of carbon steel pipe for mechanical structure, so that the thermal expansion is not severe due to temperature changes can maintain a constant damping force. Durability does not drop even for long time use.

The upper portion of the tube is reduced to the outer diameter through a shaft tube (縮管) process so that the head of the bush is forced to be fitted to one end of the tube, the periphery of the tube inclined to fit the shape of the bush by combining the bush and tube separately It is firmly combined without a means, and also has a damping function by air, and the friction material 27 is added to prevent slippage.

Therefore, in the present invention, the friction body of the piston coupled to the rod has a low damping force according to the linear reciprocating movement of the rod, and the rest of the section has a damping force while the friction body linearly reciprocates along the inclined surface of the sleeve when the rod is pulled out. There is a remarkable effect of greatly increasing the absorption of the vibration generated by the drum rotation of the washing machine.

In addition, the multi-stage integrated friction damper of the present invention is a damper for a washing machine that absorbs vibration generated by drum rotation of a washing machine, the tube 10 having one end opening and an internal space formed therein, and an opening of the tube 10. Through one end is located inside, the other end is composed of a rod 30 is exposed to the outside.

The rod 30 has a small diameter portion 134 having a small diameter and a diameter larger than the diameter of the small diameter portion 134, which is located inside the tube 10 and has a piston 30 mounted on an outer circumference thereof. Is made of a large diameter portion 135 is exposed to the outside, the end of the small diameter portion 134, the separation prevention piece 136 is formed so that the piston 30 is not separated.

The separation preventing piece 136 is the same diameter as the large diameter portion 135.

In addition, by forming a circular arc-shaped friction piece 135-1 radially on the outer circumference of the large diameter portion, the friction piece of the large diameter portion in contact with the inner circumference of the tube, so that the rod does not rotate during linear reciprocating motion. .

At this time, the diameter and the separation prevention piece of the large diameter portion in which the friction piece is formed is the same diameter.

In addition, the piston 20 is fastened to the small diameter portion 134, the piston is capable of linear reciprocating between the separation prevention piece and the large diameter portion.

That is, the width of the piston fastened to the small diameter portion is formed smaller than the width of the small diameter portion is to be linearly reciprocated between the separation prevention piece and the large diameter portion while being fastened to the small diameter portion.

The piston 20 is composed of a friction body 121 and a friction material 123 mounted on the outer circumference of the friction body.

That is, a fastening groove 122 smaller than the width of the friction body 121 is formed on the outer circumference of the friction body 121, and the friction material 123 is mounted on the fastening groove 122.

At the end of the rod 30 in which the release preventing piece 136 is formed, an air damper hole 131 through which air is introduced into the rod 30 is formed along the longitudinal direction of the rod 30. The outer periphery of the neck 135 is formed with a through hole 132 in communication with the air damper hole 131.

Therefore, the air introduced into the air damper hole 131 is discharged to the outside through the through hole 132.

Therefore, during the linear reciprocation of the rod, the air filled in the tube is introduced into the air damper hole of the rod, and the air introduced into the air damper hole is discharged to the outside through the through hole so that the rod is linearly reciprocated with a constant force.

The rod is inserted into the tube and the movement is guided by the large diameter portion of the rod and the release preventing piece during linear reciprocating motion.

In addition, a packing (P) may be mounted on an outer circumference of the separation preventing piece and the large diameter part.

The packing uses an O-ring or friction material.

Thus, the tolerance of the inner circumference of the tube and the outer circumference of the rod can be reduced.

The large diameter portion, the small diameter portion, and the anti-separation piece are manufactured integrally with the rod when the rod is manufactured by injection.

In addition, a ring-shaped elastic material (T) is attached to the surface of the separation prevention piece and the large diameter portion facing each other.

The friction body is linearly reciprocated in accordance with the linear reciprocating motion of the rod while being fastened to the small diameter portion of the rod.

Accordingly, when the rod is moved in the outward direction of the tube, the friction body is fastened in the opposite direction in which the rod moves while being fastened to the small diameter portion, and the friction body moved in the opposite direction contacts the elastic material attached to the release preventing piece. Done.

On the contrary, when the rod is moved inwardly of the tube, the friction body is fastened in the opposite direction in which the rod moves while being fastened to the small diameter part, and the friction body moved in the opposite direction is in contact with the elastic material attached to the large diameter part.

In addition, the friction material mounted on the outer periphery of the friction body may be moved in the same direction as the piston in accordance with the movement of the piston.

That is, when the rod is moved in the outer direction of the tube, the friction body is fastened to the small diameter portion is moved in the inner direction of the tube in the opposite direction in which the rod moves, the friction material is attached to the friction body moved in the inner direction of the tube It moves in the outward direction of the tube opposite the friction body and in the same direction as the piston.

On the contrary, when the rod is moved inwardly of the tube, the friction body is fastened to the small diameter portion and is moved outwardly of the tube in the opposite direction in which the rod moves, and the friction material fastened to the friction body moved outwardly is It is moved inwardly of the opposite tube.

Therefore, the friction material is moved to the left and right during the movement of the rod while the friction material is mounted in the fastening groove of the friction body, the friction material shrinks and relaxes in a wave shape, absorbs the vibration of the rod during the linear reciprocation of the rod, and smoothes the change in damping force It is.

In this case, the graphs shown in FIGS. 15 and 16 are shown. FIG. 15 is a general hysteresis curve graph with damping force, and FIG. 9 is a hysteresis curve graph applying friction material and elastic material for variable damping force.

As shown in FIG. 15, j denotes a free displacement and damping force, and k denotes a slope of the damping force.

That is, the j part represents the resonance region during the operation of the washing machine, and is a reduced deceleration section that is the part with the least vibration.

The k value is the high damping area of the washing machine.

As shown in FIG. 16, SU is a damping force displacement curve by the upper elastic material and the damping force variable friction material, and a damping force displacement curve by the SL lower elastic material.

In addition, during the linear reciprocating motion of the friction body, the friction material mounted on the friction body relaxes or contracts to show a change in damping force, and the section is the same as the SU section in FIG.

And the friction material fastened to the friction body is shown as a change value of the damping force to absorb the vibration by relaxing or contracting in a wave shape by the linear reciprocating movement of the rod.

In addition, the outer ring of the friction body or friction material may be equipped with an elastic ring.

Meanwhile, as an embodiment of the friction body, a bushing 124 may be coupled to a lower surface of the friction body linearly reciprocating while being fastened to the piston fastening portion, and the thickness of the bushing may be thick or thin, The friction force between the friction body and the small diameter part can be made large or small.

The bushing forms a groove in the inner circumference of the friction body and is inserted into the groove to be mounted or mounted to surround the inner circumference of the friction body.

On the other hand, as an embodiment of the rod used in the present invention, the rod 30 is located inside the tube 10 and the small diameter small diameter portion 134 having a piston 30 is mounted on the outer periphery, and some It consists of a large diameter portion 135 that is exposed to the outside, the upper guide fastening portion having a diameter smaller than the diameter of the small diameter portion is formed at the end of the small diameter portion of the rod.

An upper guide is fastened to the upper guide fastening part, and a rod assembly fastener 60 is fastened to the end of the upper guide fastening part to fix the upper guide.

And the friction body is fastened to the small diameter portion.

That is, in the rod assembly method, the ring-shaped friction body is fastened to the small diameter portion of the rod, and then the ring-shaped upper guide is fastened to the end portion of the small diameter portion.

In addition, the rod assembly fastener 160 is fastened, and the rod assembly fastener 160 serves to fix the upper guide at the end of the rod so as not to be disassembled.

A protrusion 133 is formed at an outer circumference of the end of the rod, and a protrusion groove 161 is formed at an inner circumference of the rod assembly fastener 160 corresponding thereto.

When the rod assembly fastener is fastened to the rod, the protrusion formed in the rod is inserted into the protrusion groove formed in the rod assembly fastener, so that the rod assembly fastener is not separated from the rod.

In addition, the rod assembly fastener and the rod may be coupled using ultrasonic thermal fusion welding or screw assembly.

In addition, the rod is inserted into the tube during the linear reciprocating motion of the large diameter portion of the rod and the upper guide guides its movement.

And the packing (P) may be mounted on the outer periphery of the upper guide and the large diameter portion.

The packing uses an O-ring or friction material.

Thus, the tolerance of the inner circumference of the tube and the upper and lower guides can be reduced.

In addition, as another embodiment of the rod used in the present invention, the mounting groove is formed on the outer circumference of the small diameter portion, the damping force variable friction material 150 is mounted on the mounting groove.

The friction body is fastened to the outer circumference of the small diameter portion in which the damping force variable friction material is mounted.

Thus, the damping force variable friction material 150 absorbs micro-vibration during linear reciprocation of the rod.

On the other hand, the tube used in the present invention is manufactured by a method of sealing by molding the lower part in a circular state in the open state on both sides using a carbon steel pipe (STKM) for mechanical structure.

In addition, the tube can be completely reduced in the inner diameter through the upper tube shaft process. That is, the upper part of the tube is reduced by an outer diameter through a shaft tube process, and fixed to the fastener 112 of the washing machine by projection welding, thereby firmly coupling the bush and the tube without a separate coupling means to damp the air. It is also to combine.

In addition, the opening side end portion of the tube was enlarged to facilitate the insertion of the rod.

In addition, the separation prevention stopper 117 protrudes from the inner circumference of the tube, and the stopper fastening groove 137 is formed along the longitudinal direction of the rod at the outer circumference of the rod.

That is, the rod reciprocating linearly inside the tube is inserted into the stopper fastening groove, the end of the stopper fastening groove is blocked by a large diameter portion, the stopper is prevented from being separated by the large diameter portion during linear reciprocating movement of the rod Will be.

In addition, an air hole 118 is formed in the tube to introduce air into the tube during linear reciprocation of the rod.

Therefore, the multi-stage integral friction damper having improved air damping ability according to the present invention is a remarkable material in which a friction material is coupled to the outer circumference of the piston reciprocating inside the tube to absorb the vibration of the piston, thereby improving the life of the air damper and smoothing the operation. It works.

Claims

A damper for a washing machine that absorbs vibration generated by drum rotation of a washing machine, the tubular tube 10, a piston 20 inserted into the tube 10 and linearly reciprocating, and the piston 20. End portion is coupled to the rod 30 is exposed to a portion out of the tube 10 and comprises a bush 40 for guiding the movement of the rod 30,

The variable damper for the washing machine, characterized in that the piston coupling portion 31 is formed so that the diameter of the rod 30 of the portion of the tube 10 coupled to the piston 20 is smaller than the portion exposed out of the tube 10. .
The method of claim 1,

The piston 20 fastened to the piston fastening portion 31 of the rod 30 may include a first stopper 21, a sleeve 22, a second stopper 23, a washer 24, and a fixed fastening portion 25. Fastening in order, variable sleeve for a washing machine, characterized in that the friction body 26 is fastened to the sleeve (22).
The method of claim 1,

The friction body 26 is divided into plural pieces and fastened radially along the outer circumference of the sleeve 22. A mounting groove 26-1 is formed at the outer circumference of the friction body 26 so that the friction material 27 is formed. Mounted, the variable damper for a washing machine, characterized in that the surface in contact with the sleeve 22 and the friction body 26 are inclined with each other.
The method of claim 1,

The lower part of the tube 10 is molded in a circular shape and sealed, and the upper part is condensed so that the head of the bush 40 can be fitted to one end of the tube 10 by reducing the outer diameter through a shaft tube process. Its periphery is axially piped in accordance with the shape of the bush 40, thereby firmly coupling the bush 40 and the tube 10 without a separate coupling means, and also has a damping function by air, and a friction material 27 is added. The variable damper for a washing machine characterized by being able to prevent slippage.
In the damper for a washing machine that absorbs vibration generated by the drum rotation of the washing machine, one end is opened through the opening of the tube 10 and the other end of the tube 10 is formed in the inner space, the other end Is composed of a rod 30 is exposed to the outside, the rod 30 is located inside the tube 10, the other end is composed of a rod 30 is exposed to the outside, the rod 30 is a tube ( A small diameter portion 134 of a small diameter located inside the 10, and the piston 30 is mounted on the outer circumference, and a diameter larger than the diameter of the small diameter portion 134, the large diameter portion is partially exposed to the outside It is made of a 135, the end portion of the small diameter portion 134 is to prevent the separation of the piston 20 is formed so that the separation prevention piece 136 is formed,

The separation preventing piece 136 is the same diameter as the large diameter portion 135 of the rod 30,

At the end of the rod 30 in which the release preventing piece 136 is formed, an air damper hole 131 through which air is introduced into the rod 30 is formed along the longitudinal direction of the rod 30. A through hole 132 communicating with the air damper hole 131 is formed at the outer circumference of the neck 135, and the air introduced into the air damper hole 131 is discharged to the outside through the through hole 132.

At the outer circumference of the large diameter portion 135 of the rod 30, a circular arc-shaped friction piece 135-1 is formed radially so that the friction piece 135-1 of the large diameter portion 135 is the inner circumference of the tube 10. By contacting the rod 30 does not rotate during linear reciprocation,

Ring-shaped elastic material (T) is attached to the surface of the separation preventing piece 136 and the large diameter portion 135 facing each other,

The piston 20 is fastened to the small diameter portion 134 of the rod 30, and the width of the piston 20 fastened to the small diameter portion 134 is formed smaller than the width of the small diameter portion 134 so that the small diameter portion ( 134 is linearly reciprocated between the separation prevention piece 136 and the large diameter part 50 while being fastened to

The piston 20 is composed of a friction body 121 and a friction material 123 mounted on the outer circumference of the friction body, and a fastening groove smaller than the width of the friction body 121 on the outer circumference of the friction body 121. 122 is formed, the fastening groove 122 is equipped with a friction material 123,

The friction body 121 of the piston 20 is linearly reciprocated in accordance with the linear reciprocating motion of the rod 30 while being fastened to the small diameter portion 134 of the rod 30, the rod 30 is a tube 10 When moved outward), the friction body 121 is moved in the opposite direction in which the rod 30 moves while being fastened to the small diameter portion 134, and the friction body 121 moved in the opposite direction is prevented from being separated. In contact with the elastic material (T) attached to the piece 136, when the rod 30 is moved inwardly of the tube 10, the friction body 121 is fastened to the small diameter portion 134 rod 30 is moved in the opposite direction to move, the friction body 121 moved in the opposite direction is to be in contact with the elastic material (T) attached to the large diameter portion 135,

In addition, the friction material 123 mounted on the outer circumference of the friction body 121 is moved in the same direction as the piston 20 according to the movement of the piston 20, and the rod 30 is outside the tube 10. When moved in the direction, the friction body 121 is moved inwardly of the tube 10, which is the opposite direction in which the rod 30 moves while being fastened to the small diameter portion 134, and inwardly of the tube 10. The friction material 123 coupled to the friction body 121 to be moved is moved outwardly of the tube 10 opposite to the friction body 121 to be moved in the same direction as the piston 20 and the rod 30. ) Is moved inwardly of the tube 10, the friction body 121 is moved outwardly of the tube 10, which is the opposite direction in which the rod 30 moves while being fastened to the small diameter portion 134. The friction material 123 fastened to the friction body 121 moving in the outward direction is directed toward the inner side of the tube 10 opposite to the friction body 121. To be moved,

The friction material 123 moves in the same direction as the rod 30 when the rod 30 moves while being mounted in the fastening groove 122 of the friction body 121, and the friction material 123 shrinks and relaxes in a wavy shape. , Multi-stage integrated friction damper characterized in that it absorbs the vibration of the rod 30 and smoothes the change in the damping force.