KR100879570B1 - Suspension of washing machine - Google Patents

Abstract

The present invention relates to a washing machine, wherein a connecting rod having one end mounted on a main body of a washing machine, a damper cap installed at another end of the connecting rod and mounted in a reservoir, a damper spring installed inside the damper cap, and the damper A damper base mounted at one end of the cap to support the connecting rod or the damper spring, and sliding along an inner circumferential surface of the damper cap, and installed at a lower portion of the damper base, and an edge of the damper base is formed on an inner surface of the damper cap. It includes an expansion spring to be extended to the side and by forming the extension spring in a continuous circumferential shape, it is possible to uniformly manage the clearance of the air gap formed between the damper base and the damper cap, and viscous damping due to excessive wear of a specific site Provided is a suspension of a washing machine that can reduce the force deterioration.

Description

Suspension of washing machine {SUSPENSION APPARATUS FOR WASHING MACHINE}

The present invention relates to a washing machine, and more particularly, to a suspension device of a washing machine that can maintain a viscous damping force even if used for a long time to effectively reduce the vibration in the transient state.

In general, a washing machine is a device for washing laundry by using the emulsification of the detergent and the friction action of the water flow due to the rotation of the washing blade and the impact action of the washing blade, mainly the electric motor, the action of detergent and water Washing, rinsing, and dehydration are carried out to remove the dirt on clothing. Its components consist of a motor, a power unit, a machine that transfers energy to the laundry, a control unit to control the washing process, a water supply and drainage system, and a water supply and drainage system.

In addition, the washing machine is classified into a drum type, agitator type, and a pulsator type according to a washing method.

Stirring type is a method of washing by rotating the wing-shaped stirrer to the left and right in the center of the washing tank, whip winding method is to wash with water generated by rotating the disk-shaped pulsator. In the drum type, water, detergent, and laundry are put into the drum on which the plurality of protrusions are formed, and the washing machine is washed by the impact of falling and lifting of the laundry by the protrusion.

1 is a cross-sectional view schematically showing a configuration of a conventional washing machine, and FIG. 2 is a cross-sectional view schematically showing a partial configuration of a suspension device according to a conventional washing machine.

1 and 2, a general washing machine 1 includes a main body or casing 10 forming the outer shape of the washing machine, a reservoir 13 accommodated in the casing 10, and an interior of the reservoir 13. Suspension device 20 for holding the reservoir 13 and one end is connected to the upper inner peripheral surface of the main body or casing 10, the other end is connected to the lower outer peripheral surface of the reservoir 13 to support the reservoir 13 Or suspension. On the other hand, the lower portion of the reservoir 13 is provided with a drive unit 15 for driving the washing tank 12.

The suspension device 20 has a damper cap 22 installed at the lower portion of the reservoir 13, a connecting rod 21 having one end penetrating the damper cap 22 and the other end mounted to the casing 10, and a damper. A damper spring 23 installed inside the cap 22 to absorb vibration of the reservoir 13 and a lower opening of the damper cap 22 to support the connecting rod 21 or the damper spring 23. And a damper base 24.

Meanwhile, an air gap 26 having a narrow gap is formed between the damper cap 22 and the damper base 24, and an expansion spring 25 is installed below the damper base 24. The expansion spring 25 serves to expand the lower portion of the damper base 24.

Referring to FIG. 3, which illustrates the bottom of the suspension according to FIG. 2, the extension spring 25 has a discontinuous circumferential shape in which both ends are spaced apart from each other, and both ends thereof are bent. Therefore, the extension spring 25 does not continuously contact the lower portion of the damper base 24 because the discontinuous portion 25a does not contact the damper base 24.

This suspension 20 serves to reduce the significantly large vibration or amplitude caused by the resonance during the transient vibration (that is, when entering the dehydration process).

The basic vibration reduction mechanism includes viscous damping and damper cap 22 and damper base 24 caused by the air escaped by air holes (not shown) of damper cap 22. Vibration is reduced by friction damping caused by friction between Here, large amplitudes or vibrations in the transient state are reduced by almost viscous damping.

However, there is an air gap 26 that can actually reciprocate between the damper cap 22 and the damper base 24. When the washing machine 1 is used for about 1,000 cycles, the clearance of the air gap 26 is reduced. Increasingly, a large amount of air escapes through the air gap 26, so that the viscous damping force decreases a lot, and thus the vibration in the over-state cannot be reduced.

In addition, even when the expansion spring 25 is mounted to prevent the clearance of the air gap 26 from increasing, a large leakage occurs in the discontinuous portion of the expansion spring 25. That is, the discontinuous portion 25a of the expansion spring 25 prevents the damper base 24 from being pushed outward from the portion 25a and the damper base 24 becomes a flat shape 24a. Since the clearance of this flat part 24a was larger than other parts, more air leaked and the viscous damping force fell.

In addition, in order to prevent friction or interference between the damper cap 22 and the reservoir 13, a lubricant such as grease is applied to the surface of the damper cap 22, and the lubricant is formed in the air hole formed in the damper cap 22 ( There was also a problem that can not prevent a smooth viscous damping action (not shown).

The present invention has been made to solve the problems of the prior art as described above, by mounting an expansion spring having a continuous shape in the lower portion of the damper base, by pushing the damper base with a constant force in the circumferential direction between the damper base and the damper cap It is a first object of the present invention to provide a washing machine suspension that can maintain a constant air gap and reduce a decrease in viscosity damping force caused by an uneven increase in air gap clearance.

It is a second object of the present invention to provide a suspension of a washing machine that can prevent the air leakage from increasing due to the increase in the air gap between the damper cap and the damper base by mounting the base cap in the lower opening of the damper cap.

It is a third object of the present invention to provide a suspension device for a washing machine that can reduce the decrease in viscosity damping performance by blocking air holes by a lubricant by forming air holes in the base cap instead of forming air holes in the damper cap. .

It is a fourth object of the present invention to provide a suspension device for a washing machine which can maintain the elastic restoring force of the expansion spring for a long time by easily overlapping the shape of the expansion spring with respect to the longitudinal direction.

The fifth object of the present invention is to provide a suspension device for a washing machine that can continuously manage the circumferential wear of the damper base by applying an expansion spring continuously contacting the damper base along the circumferential direction, thereby increasing reliability. will be.

The present invention, in order to achieve the object as described above, one end is mounted to the main body of the washing machine; A damper cap having the other end of the connecting rod penetrated therein and mounted to the reservoir; A damper spring installed inside the damper cap; A damper base mounted at one end of the damper cap to support the connecting rod or the damper spring and to slide along an inner circumferential surface of the damper cap; And an expansion spring installed at a lower portion of the damper base to extend an edge of the damper base to an inner surface side of the damper cap, wherein the extension spring has a continuous circumferential shape. To provide.

In addition, the present invention is one end of the connecting rod mounted to the main body of the washing machine for the above purpose; A damper cap having the other end of the connecting rod penetrated therein and mounted to the reservoir; Elastic means installed in the damper cap; A damper base mounted to one end of the damper cap and supporting the connecting rod or the elastic means; And an expansion spring installed at a lower portion of the damper base to allow an edge of the damper base to extend outwardly, wherein an interval between the damper cap and the damper base is constant in the circumferential direction by the expansion spring. It provides a suspension of the washing machine characterized in that it is maintained.

By the configuration as described above, the circumferential wear of the damper cap and the damper base can be kept constant, and the decrease in the viscosity damping force due to the nonuniform increase of the air gap can be reduced, and the durability of the suspension can be increased.

Here, the extension spring is characterized in that the portion is formed so as to overlap in the longitudinal direction. As a result, there is no portion discontinuous in the circumferential direction in the extension spring, and there is no part in which the damper base does not extend to the outside by the extension spring.

In addition, the expansion spring is characterized in that it is mounted in the groove formed in the lower portion of the damper base. That is, by forming a recess in the inner surface of the lower portion of the damper base can secure the seating of the expansion spring and prevent the expansion spring from being separated from the damper base during the operation of the suspension.

At this time, instead of the groove may be formed a locking step for preventing the expansion spring is separated from the lower portion of the damper base.

On the other hand, the lower portion of the damper base may be formed with a slit to help the expansion of the lower portion of the damper base. By forming the slit in this way, the lower portion of the damper base can be easily expanded even when an extension spring having a large elastic restoring force is used.

In addition, both ends of the expansion spring is characterized in that it is bent toward its center. By pressing the bent portion of the expansion spring to reduce the expansion spring and mounting on the damper base can increase the ease of installation of the expansion spring.

The damper cap may be provided with an air hole for air damping. In order to prevent the air hole from being blocked by a lubricant such as grease, the periphery of the air hole may be formed high.

Meanwhile, the suspension device may further include a base cap mounted below the damper cap to reduce leakage of air inside the damper cap. As such, by mounting the base cap in the lower opening of the damper cap, air leakage through the air gap between the damper cap and the damper base can be completely blocked. In this case, an air hole is formed in the damper cap to form a viscous damping force. It is desirable to maintain.

Here, the base cap and the damper cap is effective to be hooked, but is not limited thereto, and may be fastened by forming a screw thread in the base cap and the damper cap.

In addition, the base cap may be formed with an air hole for air damping. When the base cap is attached to the damper cap to block air leakage through the air gap, the viscous damping action may not be properly exhibited, thereby increasing the excessive vibration. In order to prevent such a phenomenon, it is effective to form an air hole in the base cap, and by forming the air hole in the base cap instead of the damper cap, it is possible to reduce the blockage of the air hole by a lubricant such as grease.

On the other hand, the present invention, to achieve the above object, the connecting rod having a predetermined length; A damper cap in which a portion of the connecting rod is inserted through a central portion thereof; A damper base supporting one end of the connecting rod and mounted to one end of the damper cap; And an expansion spring mounted at a lower portion of the damper base to maintain a constant air gap formed between the damper cap and the damper base to increase the viscous damping force caused by the air flowing out through the air gap. It provides a suspension of the washing machine characterized in that.

Here, the expansion spring is characterized in that the continuous contact with the side of the lower portion of the damper base. As a result, even if the lower portion of the damper base is rubbed with the damper cap, wear of a specific portion may be prevented from becoming larger than other portions.

In addition, a lower portion of the damper cap, a base cap for blocking the leakage of air in the damper cap is mounted, and at least one of the damper cap or the base cap is formed with air holes for viscous damping It is done.

By configuring in this way, the fall of the viscous damping force by the air which exists in the said damper cap can be reduced.

As described above, the present invention can uniformly manage the clearance of the air gap formed between the damper base and the damper cap by attaching the expansion spring continuously formed along the circumferential direction to the damper base, The degradation of the viscous damping force can be reduced.

In addition, the present invention can reduce the increase in the clearance of the air gap due to the wear of the damper base that slides against the damper cap, thereby extending the life of the suspension.

In addition, according to the present invention, even if the air gap between the damper cap and the damper base is increased according to the use of the suspension device, the lowering of the viscous damping force can be reduced by attaching a separate base cap to the opening of the damper cap.

In addition, the present invention by forming a separate air hole in the base cap mounted to the lower portion of the damper cap, even if the lubricant applied to the damper cap to prevent the air hole formed in the base cap is blocked by the lubricant applied to the damper cap Provided is a suspension of a washing machine that can reduce the deterioration of viscous damping performance.

In addition, the present invention forms an extension spring or a bent portion in the extension spring so as to overlap in the circumferential direction to the longitudinal direction, and by using such a portion to mount the expansion spring to the damper base can improve the productivity of the suspension device, The elastic restoring force of the expansion spring can be maintained for a long time.

In addition, the present invention provides a suspension device for a washing machine that can reduce a large amplitude or noise caused by excessive vibration during dehydration even when the washing machine is used for a long time.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the configuration and operation according to an embodiment of the present invention.

However, in describing the present invention, a detailed description of known functions or configurations will be omitted for clarity of the gist of the present invention.

In addition, the same reference numerals are given to the same and the same components as those described above, and detailed description thereof will be omitted.

4 is a cross-sectional view schematically showing a suspension of a washing machine according to an embodiment of the present invention, Figure 5 is a perspective view showing a damper base mounted to the suspension according to FIG.

On the other hand, the washing machine according to the present invention is the same as the configuration of the conventional washing machine 1 shown in FIG. 1 except for the configuration of the suspension device 200, the description of the rest of the configuration except the suspension device 200 will be omitted. Shall be.

As shown in FIGS. 4 and 5, the suspension device 200 according to the embodiment of the present invention includes a connection rod 210, a damper cap 220 at which one end of the connection rod 210 penetrates. The damper spring 230 formed in the damper cap 220, the damper base 240 supporting one end of the connecting rod 210 installed through the damper cap 220, and the damper base 240. The expansion spring 260 mounted on the lower portion, and the base cap 250 is mounted on the opened lower portion of the damper cap 220 is configured.

The upper portion of the damper cap 220 extends long like a neck of a beverage bottle, and the extended portion surrounds the connection rod 210.

Here, the connecting rod 210 passes through the through hole 222 formed in the upper portion of the damper cap 220 to be positioned inside the damper cap 220. On the other hand, one end of the through hole 222 extends to the inside of the damper cap 220 to form a connection rod support portion 223 that surrounds and supports the connection rod 210.

One end of the connecting rod 210 is fixed to the connecting rod fixing part 245 of the damper base 240. The connecting rod fixing part 245 is formed to protrude on the upper portion of the damper base 240, and it is effective to have a predetermined height to stably support the connecting rod 210.

On the other hand, a plurality of protrusions 246 are formed on the outer circumferential surface of the connecting rod fixing part 245, and the protrusions 246 are press-fitted into the inner circumferential surface of the damper spring 230 to firmly support the damper spring 230. Function

The lower end of the damper spring 230 is supported by the protrusion 246 on the surface of the connecting rod fixing part 245, and the upper end is supported by the spring support part 224 formed on the inner surface of the damper cap 220.

At this time, in the initial state, that is, the laundry or no washing water in the washing machine, the damper spring 230 maintains a compressed state to some extent, and the damper base 240 supporting the damper spring 230 is a damper cap 220. It is preferred to be located sufficiently inward from the lower end of the. When the laundry or the wash water flows into the washing tank 12 (see FIG. 1), the damper spring 230 extends due to the load, and the damper base 240 moves to the lower portion of the damper cap 220. If the base 240 is at the end of the damper cap 220, laundry or the like flows in, and the damper base 240 may completely escape the damper cap 220.

Here, the damper spring 230 is preferably a compression coil spring, but is not necessarily limited thereto, and may be any elastic means capable of absorbing or offsetting vibration to some extent while having elastic restoring force. For example, one end of the connecting rod 210 and the connecting rod fixing part 245 of the damper base 240 may be connected using a rubber member. Alternatively, the damper spring 230 may be replaced using a rubber pillar (not shown) having a hollow formed therein.

When the damper spring 230 is used as the elastic means, one end of the connecting rod 210 located inside the damper cap 220 is effectively positioned inside the damper spring 230.

On the other hand, the air hole 221 is formed in the upper portion of the damper cap 220, the viscous damping caused by the air present in the damper cap 220 is generated through the air hole 221. A fine air gap 223 is formed between the inner surface of the damper cap 220 and the outermost outer circumferential surface of the damper base 240, and friction damping occurs through the air gap 223.

A separate base cap 250 may be mounted in the lower opening of the damper cap 220. The base cap 250 is fastened by a hook (not shown) formed in the damper cap 220 while receiving the damper base 240 therein. In order to further secure the airtightness inside the damper cap 220, the coupling portion of the damper cap 220 or the base cap 250 may be threaded to form a combination thereof.

Referring to Figure 5, the damper base 240 will be described in detail as follows.

A connection rod fixing part 245 connected to one end of the connection rod 210 is formed on the upper portion of the damper base 240, and a plurality of protrusions 246 are provided on an outer circumferential surface of the connection rod fixing part 245. . The lower part of the connecting rod fixing part 245 is formed with a spring support part 247 integrally therewith, which forms the spring support part 247 to have a wide disc so as to sufficiently support the size of the damper spring 230. It is preferable.

A skirt portion 243 formed wider than the spring support portion 247 is formed integrally with the spring support portion 247 below the spring support portion 247. Here, the skirt portion 243 is a thin cylindrical shape having a predetermined height and an air gap 223 is formed between the outer surface of the skirt portion 243 and the inner surface of the damper cap 220.

Meanwhile, a plurality of slits 242 are formed in the skirt portion 243 along the height direction thereof, and an expansion spring 260 is mounted on an inner surface of the skirt portion 243. In this case, in order to prevent the extension spring 260 from being separated from the skirt portion 243, the groove 244 is formed on the inner surface of the skirt portion 243 or the locking step 241 is formed.

Since the expansion spring 260 is mounted on the skirt portion 243 in a state in which the diameter is smaller than the initial state, the expansion spring 260 has elastic restoring force to return to the diameter of the initial state in the state in which the expansion spring 260 is mounted. As a result, the edge of the damper base 240 extends toward the inner surface side of the damper cap 220. That is, the skirt portion 243 is pushed toward the damper cap 220 and expanded.

At this time, by forming the plurality of slits 242 in the skirt portion 243, the degree of expansion of the skirt portion 243 can be increased, and the skirt portion 243 is used even when the extension spring 260 having a small elastic restoring force is used. ) Can be pushed outward.

Meanwhile, the locking jaw 241 or the slit 244 may be formed either or both of them in consideration of the size of the damper base 240 or the elastic force of the expansion spring 260.

Here, the extension spring 260 should have a continuous cylindrical shape without discontinuous portions. Hereinafter, the extension spring will be described with reference to FIGS. 6 and 7.

Figures 6a to 6c is a view showing the expansion spring used for the suspension according to Figure 4, Figures 7a to 7c is a view showing the expansion spring used for the suspension of the washing machine according to another embodiment of the present invention.

As shown in FIG. 6, the expansion spring 260 applied to the suspension according to the embodiment of the present invention has a substantially continuous ring shape when viewed in plan (see FIG. 6A), and when viewed from the side. Some parts overlap or overlap in the direction (see FIG. 6B). That is, both ends of the expansion spring 260 are wound so as to overlap and contact each other to a certain length.

Here, both ends 260a and 260b of the expansion spring 260 are bent toward the center of the spring 260. These bends 260a and 260b are used when the extension springs 260 are mounted to the damper base 240. When the bends 260a and 260b are pressed on both sides, the diameter of either side of the extension springs 260 is increased. It can be easily attached to the damper base 240 while being small. When the bent portions 260a and 260b are released after being mounted to the damper base 240, the expansion spring 260 is restored to its original state. In this process, the skirt portion 243 is extended to the outside.

In addition, as shown in FIG. 6C, since the expansion spring 260 has a continuous circumference, the expansion spring 260 is continuously in contact with the lower side of the damper base 240, that is, the skirt portion 243. There is no part which the skirt part 243 does not contact. As a result, the air gap 223 formed between the damper cap 220 and the damper base 240 is uniformly maintained in the circumferential direction of the expansion spring 260 and the clearance of the air gap 223 can be prevented from becoming uneven. Can be.

By using the expansion spring 260 having a continuous circumferential shape, even if the skirt portion 243 of the damper base 240 rubs against the inner surface of the damper cap 220 can be reduced to wear flat.

Meanwhile, reference numeral “211”, which is not described in FIG. 6C, is one end of the connecting rod 210.

FIG. 7 is a view illustrating an extension spring used in a suspension device of a washing machine according to another embodiment of the present invention. Referring to this, an alternative shape of the extension spring 261 may include an extension spring 260 shown in FIG. It is the same except that there is no bend at both ends.

When viewed from the front, it has a continuous ring shape (see FIG. 7A), and when viewed from the side, it is wound to overlap a predetermined portion in the longitudinal direction (see FIG. 7B). As such, by providing the overlapped portions, the elastic restoring force of the expansion spring 261 can be maintained for a long time, and the expansion spring can be easily mounted. That is, when the center portion of the expansion spring 261 is held while pressing, the diameter of either of the expansion springs 261 becomes small, and thus, the diameter of the expansion spring 261 becomes easy to mount to the skirt portion 243.

Here, the expansion spring 260 shown in FIG. 6 and the expansion spring 261 shown in FIG. 7 have almost the same shape except that the bent portions 260a and 260b are formed at both ends, so that both of them have the same mold. There is also an advantage that can be produced. That is, since the expansion spring 260 shown in FIG. 6 is manufactured by using a mold of the expansion spring 261 shown in FIG. 7, the extension spring 260 only needs to be bent at both ends by using a press or the like. Both types of expansion springs can be manufactured, increasing productivity.

8 is a cross-sectional view illustrating a modified example of the washing machine suspension according to FIG. 4. The suspension device 200 ′ shown in FIG. 8 is different from the suspension device 200 ′ shown in FIG. 4 in that air holes 251 are formed in the base cap 250 ′.

The suspension device 200 shown in FIG. 4 has a base cap 250 mounted on the lower portion of the damper cap 220 and does not form an air hole in the base cap 250, thereby preventing air leakage through the air gap 223. Although it may be blocked, it may be insufficient to reduce the vibration of the transient state because it is difficult to escape the air present in the damper cap 220. In order to solve this problem, the air hole 251 may be formed in the base cap 250 ′.

Since the air hole 251 formed in the base cap 205 'is formed on the lower surface of the suspension device 200', the air hole 251 even if lubricant such as grease applied to the damper cap 220 flows down. There is an advantage that can not be prevented.

In this case, when the air hole 251 is formed in the base cap 250 ′, it may be preferable not to form the air hole 221 of the damper cap 220 which is blocked by the lubricant. However, if sufficient viscous damping cannot be achieved only by the air holes 251 formed in the base cap 250 ', it may be effective to form the air holes 221 in the damper cap 220 as well. However, considering that the air hole 221 formed in the damper cap 220 is blocked by a lubricant such as grease, the air hole 221 is made high to prevent the lubricant from flowing into the air hole 221.

In order to use the viscous damping caused by the outflow of air to the maximum to reduce the vibration in the transient state, the air hole 221 of the damper cap 220 or the air hole 251 of the base cap 250 'is formed by appropriate combination. It is preferable. That is, the air hole may be formed in only one of the damper cap 220 and the base cap 250 'or both may be formed. However, this selection should be made in terms of vibration analysis in consideration of the capacity of the washing machine and the rotational speed of the washing tank during dehydration.

By using the suspension device 200, 200 ′ as described above, the air gap 223 formed between the damper cap 220 and the damper base 250, 250 ′ can be kept constant, thereby maintaining the air gap 223. It is possible to increase the viscous damping force by the air flowing out.

This viscous damping force is improved by more than two times compared to the conventional suspension device 20 (see FIG. 1), and thus, the transient vibration of the washing tub 12 (see FIG. 1) can be improved by 30% or more. Hereinafter, the performance of the suspension system according to the exemplary embodiment of the present invention will be compared with the experimental data.

9 shows an experimental graph showing amplitude (mmm) over time (seconds). Referring to FIG. 9, the conventional suspension device 20 has a damping factor of 0.32 and a damping factor of the suspension device 200 according to an embodiment of the present invention is 0.74. to be. The damping coefficient (ζ) is a constant indicating the rate at which the amount expressed as a function of spatial coordinates, time, etc. decreases, and is also used to indicate an index for suppressing the vibration of an object.

The larger the value of the damping coefficient means that the damping performance is better, it is found that the damping performance of the suspension device 200 according to an embodiment of the present invention is about two times better than the damping performance of the conventional suspension device 20. Can be.

On the other hand, Figure 10 is an experimental graph comparing the horizontal vibration of the transient state of the reservoir (13, see FIG. 1) in the case of using the conventional suspension device 20 and the suspension device 200 according to Figure 4, Figure 11 In the case of using the conventional suspension device 20 and the suspension device 200 according to Fig. 4, is an experimental graph comparing the transient vertical vibration of the reservoir 13 (see Fig. 1).

First, referring to FIG. 10, the horizontal axis of the graph shows the X direction vibration and the Y direction vibration of the upper part of the reservoir 13, and the X direction vibration and the Y direction vibration of the lower part of the reservoir 13, and the amplitude (mm) is represented on the vertical axis. Is shown. According to the experimental graph, it can be seen that when the suspension device 200 according to the embodiment of the present invention is applied, all horizontal amplitudes are reduced from more than 8.8 mm to less than 1 mm than the conventional suspension device 20.

Next, referring to FIG. 11, the Z axis vibration of the upper part of the reservoir 13 and the Z direction vibration of the lower part of the reservoir 13 are displayed on the horizontal axis of the graph, and the amplitude (mm) is displayed on the vertical axis. According to the experimental graph, it can be seen that in the case of applying the suspension device 200 according to the embodiment of the present invention, all the vertical amplitudes are reduced from more than 2.8 mm to less than 2.5 mm than the conventional suspension device 20.

As described above, in the case of using the suspension device 200, 200 'according to the present invention, it can be seen that the vibration of the transient state is reduced by up to about 30% compared with the conventional one, and the clearance of the air gap can be maintained uniformly.

On the other hand, the present applicant has been described only in the case where the suspension device according to the present invention is applied to a washing machine, but is not limited to the washing machine, and may be applied to various fields such as a dry washing machine, a dry laundry or a combined washing system.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

1 is a cross-sectional view schematically showing a conventional washing machine configuration,

2 is a cross-sectional view schematically showing a part of a suspension device according to a conventional washing machine;

3 is a bottom view of the suspension according to FIG. 2;

4 is a cross-sectional view schematically showing a suspension of a washing machine according to an embodiment of the present invention;

5 is a perspective view showing a damper base mounted to the suspension according to FIG. 4;

6a to 6c show the expansion spring used in the suspension according to FIG.

7a to 7c is a view showing the expansion spring used in the suspension of the washing machine according to another embodiment of the present invention,

8 is a cross-sectional view showing a modification of the washing machine suspension according to FIG. 4;

Figure 9 is an experimental graph comparing the damping force of the conventional suspension and the suspension according to Figure 4,

10 and 11 are experimental graphs comparing the horizontal and vertical vibration of the transient state in the case of using the conventional suspension and the suspension according to FIG.

** Description of the symbols for the main parts of the drawings **

200,200 ': suspension 210: connecting rod

220: damper cap 221: air hole

222: through hole 223: air gap

230: damper spring 240: damper base

241: engaging jaw 242: slit

243: skirt 244: groove

250, 250 ': Base cap 251: Air hole

260,261: extension spring 260a, 260b: bend

Claims (14)

A connecting rod having one end mounted on a main body of the washing machine; A damper cap having the other end of the connecting rod penetrated therein and mounted to the reservoir; A damper spring installed inside the damper cap; A damper base mounted at one end of the damper cap to support the connecting rod or the damper spring and to slide along an inner circumferential surface of the damper cap; And And an expansion spring installed below the damper base to extend an edge of the damper base toward an inner surface side of the damper cap. The extension spring has a continuous circumferential shape, the suspension between the damper cap and the damper base by the expansion spring is maintained in the circumferential direction constant suspension device. delete The method of claim 1, Suspension device of the washing machine, characterized in that the expansion spring is formed so that a portion overlaps along the longitudinal direction. The method of claim 3, wherein The expansion spring is suspended in the washing machine, characterized in that mounted to the groove formed in the lower portion of the damper base. The method of claim 3, wherein The lower portion of the damper base, the suspension of the washing machine, characterized in that at least one of a slit for preventing the expansion of the expansion spring is separated or the slit to help the lower portion of the damper base is formed. The method of claim 3, wherein Suspension device of the washing machine, characterized in that both ends of the expansion spring is bent toward the center thereof. The method of claim 3, wherein Suspension device of the washing machine, characterized in that the damper cap is formed with air holes for air damping. The method of claim 1, The suspension device, Suspension device of the washing machine further comprises a base cap mounted on the lower portion of the damper cap to reduce the leakage of air inside the damper cap. The method of claim 8, Suspension device of the washing machine, characterized in that the base cap and the damper cap is hooked. The method of claim 8, Suspension of the washing machine, characterized in that the base cap is formed with air holes for air damping. A connecting rod having a predetermined length; A damper cap in which a portion of the connecting rod is inserted through a central portion thereof; A damper base supporting one end of the connecting rod and mounted to one end of the damper cap; And And an expansion spring mounted on a lower portion of the damper base to maintain a constant air gap formed between the damper cap and the damper base to increase the viscous damping force caused by the air flowing out through the air gap. Suspension device of the washing machine, characterized in that the expansion spring is in continuous contact with the side of the lower portion of the damper base. delete The method of claim 11, The lower part of the damper cap, the suspension device of the washing machine, characterized in that the base cap for preventing the leakage of the air inside the damper cap is mounted. The method of claim 13, Suspension device of the washing machine, characterized in that the air hole for the viscous damping is formed in at least one of the damper cap or the base cap.

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