KR100273406B1 - Damper for washing machine - Google Patents

Abstract

PURPOSE: A damper is provided to minimize vibration and noise at a washing process. CONSTITUTION: A damper of a washing machine contains a cylindrical damping cap(10) penetrated an inserting slot(11) and combined with an outer tub; a supporting rod(20) combined with an outer case and inserted in the inserting slot(11); a spring(30) inserted inside the damping cap(10) and the supporting rod(20); a spring base(40) to support the spring(30) by inserting in the supporting rod(20); a damper base(50) fixed in the supporting rod(20); a multi-functional damping device(S) between the spring base(40) and the damper base(50) to have variable friction damping force and air damping force according to a displacement and a load by inserting in the supporting rod(20); and interval maintaining members(70) to maintain intervals by inserting between the multi-functional damping device(S) and the spring base(40) and between the multi-functional damping device(S) and the damper base(50). In a transient state, the damping device(S) is reciprocated by contacting a cover of the damping device(S) with the damping cap(10) through large vibration. Vibration into the outer case is reduced by friction damping force through the cover and the damping cap(10) and air damping force through air inside the sealed damping cap(10). In a steady state, the vibration is reduced through the friction damping force and the air damping force by folding a depressed portion of the elastic pad.

Description

Damper of washing machine

The present invention relates to a washing machine, and more particularly, to a damper of a washing machine for reducing vibration noise generated in the process of washing laundry.

In general, a washing machine puts laundry and detergent into a washing machine and supplies washing water to wash a laundry through a series of processes such as washing, rinsing, and dehydration.

1 schematically shows an example of the washing machine. As shown in the drawing, the washing machine includes an outer case 1 having a predetermined internal volume and a predetermined container for storing water therein. (1) is provided in the outer tub (2) to be installed in the inside, the washing tub (3) formed in a cylindrical shape to hold laundry therein, and installed in the interior of the outer tub (2), and the outer lower surface of the outer tub (2) It comprises a drive motor (4) for generating a driving force, and a clutch (5) for transmitting and blocking the driving force of the drive motor (4) to the washing tank (3).

And between the outer tank (2) assembly and the outer case made of components coupled to the outer tank (2) supports the outer tank (2) assembly to the outer case (1) and occurs in the outer tank (2) assembly during the washing process Several dampers (D; Dampers) are installed to reduce the vibrations to be transmitted to the outer case (1) to generate vibration noise.

Currently, the damper of the washing machine that is most widely used, as shown in Figs. 2 and 3, the one side is opened, the through-hole 6a is formed in the other end and the air hole 6b is formed in the side A cap 6 coupled to one side of the outer tub 2, a coil spring 7 inserted into the gap 6, and formed to have a predetermined length, and one side of the outer casing 1 is formed on one side of the outer casing 1. The other side of the rod 8 which is coupled and the other side is inserted into the through hole 6a of the cap 6 and inserted into the coil spring 7 and the inner side of the cap 6 It is configured to include a base (9) coupled to the end to seal the inside of the cap (6) and at the same time support the coil spring (7) to be in contact with the inner peripheral surface of the cap (6). 3 shows an example in which the shape of the base is different.

In the conventional washing machine damper as described above, when vibration occurs in the tub 2 assembly during the washing process, the vibration is transmitted to the rod 8 and the base 9 is elastically supported by the coil spring 7. The vibration transmitted while reciprocating inside the cap 6 is attenuated.

The damper may be a friction damping force caused by friction generated by the reciprocating motion of the base 9 in contact with the inner circumferential surface of the cap 6, or the base reciprocating motion in a state in which the base 9 seals the interior of the cap 6. As a result, the damping force generated by the air damping force (Air Damper Force) generated by the inflow and outflow of the air inside the cap 6 through the air hole, or both are simultaneously attenuated.

However, the conventional damper structure as described above, because the damping force in the initial state during the washing process, especially during the dehydration process to catch excessive vibration, but after the initial state has passed due to the damping force in the normal state of motion, that is, the normal state There is a problem that the calendar is increased to generate a large vibration noise.

Accordingly, an object of the present invention is to provide a damper of a washing machine to minimize the vibration noise generated during the washing process.

1 is a cross-sectional view schematically showing an example of a general washing machine;

2 is a cross-sectional view showing a damper of a conventional washing machine;

3 is a cross-sectional view showing another example of a conventional washing machine damper;

4 is a cross-sectional view showing a washing machine damper of the present invention;

5 is a front view showing a spring base and a damper base constituting the washing machine damper of the present invention,

Figure 6a is a side cross-sectional view showing a multi-function damping means constituting the washing machine damper of the present invention,

Figure 6b is a front view showing the multi-function damping means constituting the washing machine damper of the present invention,

Figure 7a is a side cross-sectional view showing an elastic pad constituting the washing machine damper of the present invention,

Figure 7b is a front view showing an elastic pad constituting the washing machine damper of the present invention,

8 is a front view showing a modification of the elastic pad constituting the washing machine damper of the present invention,

9 is a front view showing another modified example of the elastic pad constituting the washing machine damper of the present invention;

10 is a front view showing another modified example of the elastic pad constituting the washing machine damper of the present invention;

Figure 11a is a side cross-sectional view showing a cover constituting the washing machine damper of the present invention,

11B is a front view showing a cover constituting the washing machine damper of the present invention;

12 to 15 are cross-sectional views showing various embodiments of the cross-sectional shape of the edge of the cover constituting the washing machine damper of the present invention;

16 is a graph showing a transmission force for a conventional washing machine damper,

17 is a graph showing the transmission force for the washing machine damper of the present invention.

(Explanation of symbols for the main parts of the drawing)

One ; Outer case 2; Bird

10; Damping cap 11; Tipping cap insertion hole

20; Support rod 30; spring

40; Spring base 50; Damper base

60; Elastic pads 61; Elastic pad body

62; Elastic pad contacts 63; Elastic Pad Through Hole

64; Elastic pad coupler 65; Elastic pad depression

70; Spacing member 80; cover

81; Cover ring portion 82; Cover fitting

83; Cover curved portion 84; Cover air gap

S; Multifunctional Damping Member

In order to achieve the object of the present invention as described above, a damping cap is formed in a cylindrical shape, one side is opened and the insertion hole is penetrated to the other end and is coupled to one side of the outer tub, and has a predetermined length and one side is inserted into the outer tub. And a support rod coupled to one side of the outer case and being inserted into the insertion hole of the damping cap, and a spring inserted into the damping cap and inserted into one end of the support rod, and positioned inside the damping cap. A spring base inserted into the support rod to support the spring, a damper base inserted into the support rod and fixed to the end of the support rod so as to be positioned at a predetermined interval below the spring base, and between the spring base and the damper base. Position and is inserted into the supporting rod to be in contact with the inner circumferential surface of the damping cap and is variable according to displacement and load. Multifunction damping means configured to have a damping force, an air damping force and an elastic damping force, and a space keeping member inserted between the multifunctional damping means and the spring base and between the damping means and the damper base to maintain a gap. A damper of a washing machine is provided.

The damping means is formed in a disk-shaped body portion having a predetermined thickness and protrudes to both sides of the body portion with a predetermined height and area, and a through hole is formed therein, and the contact portion contacting the spacer member and the outer circumferential surface of the body portion. An elastic pad made of an elastic member formed to have a predetermined depth and width so as to be recessed at a predetermined depth and width so as to be positioned around the contact portion and the contact portion formed at a predetermined width and depth in the elastic member to form a depression for easy bending; A penetrating portion formed to be joined to the engaging portion of the elastic pad on the inner circumferential surface of the annular portion having an inner diameter corresponding to the outer diameter of the pad and a predetermined width and thickness, and a curved portion formed in a curved surface on the outer circumferential surface of the annular portion and the annular portion The fitting portion is made of plastic so that the air gap portion is formed to be several The damper of the washing machine is provided, characterized by consisting of a cover which is coupled to the coupling portion.

The outer diameter of the damping means is provided with a damper of the washing machine, characterized in that formed larger than the inner diameter of the damping cap.

The depression of the elastic pad is provided with a damper of the washing machine, characterized in that formed in an elliptical shape and the elliptical shape is formed at several equal intervals.

A recess of the elastic pad is formed in a circular shape, and the damper of the washing machine is provided, characterized in that a plurality of circularly formed at equal intervals.

The air gap portion of the cover is provided with a damper of the washing machine, characterized in that several are formed at equal intervals.

The width of the cover is provided with a damper of the washing machine, characterized in that formed larger than the width of the elastic pad.

The curved surface portion of the cover is provided with a damper of the washing machine, characterized in that formed in two stages curved surface.

Hereinafter, the washing machine damper of the present invention will be described according to the embodiment shown in the accompanying drawings.

The damper of the present invention, as shown in Figure 4, the damping cap 10 is formed in a cylindrical shape in which one side is opened and the insertion hole 11 is penetrated at the other end and coupled to one side of the outer tub 2, and It has a length of one side is coupled to one side of the outer case (1) in which the outer tank (2) is inserted and the other side is the support rod 20 is inserted into the insertion hole (11) of the damping cap 10, and the The spring 30 is inserted into the damping cap 10 and inserted into one side of the support rod 20, and the spring 30 is inserted into the support rod 20 so as to be positioned inside the damping cap 10. A spring base 40 for supporting and a damper base 50 inserted into the support rod 20 to be positioned at a predetermined interval below the spring base 40 and fixed to an end of the support rod 20; Located between the spring base 40 and the damper base 50, the support rod 20 to be in contact with the inner circumferential surface of the damping cap 10 The multi-function damping means (S) and the multi-function damping means (S) and the spring base 40 and inserted into the multi-function damping means (S) and have a variable friction damping force, air damping force and elastic damping force according to the displacement and load And a spacing holding member 70 inserted between the means S and the damper base 50 to maintain a spacing therebetween.

The damping cap 10 is formed to have a predetermined diameter and length, and one side is opened and the other side is blocked and the insertion hole 11 is formed in the middle of the blockage. And it is formed to be inclined so that the diameter is small to the side in which the insertion hole 11 of the damping cap 10 is formed. The support rod 20 is formed of a circular rod having a predetermined length and diameter, one side is coupled to and fixed to the outer case (1) and the other side is formed with a catching portion 21 to which the damper base 50 is inserted and caught. .

The spring 30 is made of a coil spring.

The spring base 40, as shown in Figure 5, is formed in a disc shape having a diameter and a predetermined thickness larger than the outer diameter of the spring 30 and smaller than the inner diameter of the damping cap 10, wherein the support rod The through hole 41 into which the 20 is inserted is formed. The damper base 50 is formed in a disc shape having a diameter and a predetermined thickness that is larger than the outer diameter of the spring 30 and smaller than the inner diameter of the damping cap 10, among which the support rod 20 is inserted therein. 51 is formed.

The gap maintaining member 70 is formed in a disc shape having a diameter smaller than the inner diameter of the damping cap 10 and having a predetermined thickness, and the material is formed of an elastic material such as rubber.

The multi-function damping means (S), as shown in Figure 6a, 6b, the elastic pad 60 is formed of a disc-shaped elastic member, coupled to the elastic pad 60 of the damping cap 10 The cover 80 is formed of a ring-shaped plastic so as to contact the inner peripheral surface.

As shown in FIGS. 7A and 7B, the elastic pad 60 protrudes from a disc shaped body portion 61 having a predetermined thickness and both sides of the body portion 61 to a predetermined height and area. In addition, a through hole 63 is formed therein, and a coupling part 64 formed at a predetermined width and depth on the contact portion 62 and the outer circumferential surface of the body portion 61 in contact with the spacing member 70. A recess 65 is formed in the body 61 so as to be positioned at the circumference of the contact portion 62 so as to be recessed in a predetermined depth and width so as to bend easily. The depressions 65 are formed in an elliptical shape, the elliptical is preferably formed four at equal intervals.

As a modification of the recessed portion 65, as shown in Figure 8, it is preferably formed in a circular shape and four circularly formed at equal intervals.

9 shows another modification of the depression 65.

And, Figure 10 shows another modified example of the elastic pad 60, the contact portion 62 and the coupling portion 64 is similar, so that the bending of the thickness of the center portion of the body portion 61 is well made It is a structure reduced than the thickness of the body part 61 mentioned above.

11A and 11B, the cover 80 has an inner diameter corresponding to the outer diameter of the elastic pad 60 and an inner circumferential surface of the ring portion 81 having a predetermined width and thickness. Air portion formed to penetrate the coupling portion 82 and the curved portion 83 formed in a curved surface on the outer circumferential surface of the annular portion 81 and the annular portion 81 formed to be coupled to the coupling portion 64 of The gap portion 84 is formed. Preferably, two air gap portions 84 of the cover 80 are formed at equal intervals.

As shown in FIGS. 12 and 13, the curved portion 83 is formed to have a width larger than the thickness of the elastic pad body portion 61, and the shape thereof is preferably formed in an arc shape. 12 is a form in which the rear surface of the protruding protrusion (a) is straight, and FIG. 13 is a form in which the rear surface of the protruding protrusion (a) is curved.

As another modified example of the curved portions 83 and 62, it is formed in two stages as shown in FIG.

15 shows another modified example of the curved portion 83, in which a curved portion 83 is formed on the outer circumferential surface at the same width as the thickness of the body portion 61. As shown in FIG.

The outer diameter of the damping means (S) consisting of the elastic pad 60 and the cover 80 is formed larger than the inner diameter of the damping cap (10).

Hereinafter, the operational effects on the washing machine damper of the present invention will be described.

First, the washing tank 3 rotates during dehydration during the process of washing the laundry by supplying laundry and detergent in a washing machine, and not only causing vibration by the unbalanced state of the laundry, but also causing vibration in the outer tank 2 itself. It is generated, and the generated vibration is attenuated through the damper of the present invention is suppressed from being transmitted to the outer case (1). When the damper vibrates in the outer tub (2) assembly during the washing process, the vibration is transmitted to the support rod 20, forming the assembly with the spring base 40, the damper base (50) and the spacing member (70). The damping means S is elastically supported by the spring 30 and reciprocates while being in contact with the inner circumferential surface of the damping cap 10, and the friction damping force and the air damping force by the air inside the damping cap 10, and The vibration transmitted by the elastic damping force by the damping means S is attenuated.

The damper has a characteristic that the amplitude of vibration increases in the initial state when dehydration starts during dehydration during the washing process, and the amplitude of vibration is small in a steady state after a predetermined time. The cover 80 of the damping means S is reciprocated by a predetermined distance while being supported by the spring 30 in a state in which the cover 80 of the damping means S is in contact with the inner circumferential surface of the damping cap 10. At this time, the friction damping force generated between the cover 80 of the damping means (S) and the inner peripheral surface of the damping cap 10 and the air damping force by the air in the damping cap 10 sealed by the damping means (S) The vibration transmitted to the outer case 1 is attenuated.

In addition, in the normal state, the elastic pad recessed portion 65 of the damping means S in a state in which the cover 80 of the damping means S is in contact with the inner circumferential surface of the damping cap 10 by a small vibration transmitted to the supporting rod 20. The bending motion is generated by) and the vibration transmitted to the outer case 1 is attenuated by the air damping force and the elastic damping force of the elastic pad 60. When the elastic pad 60 is firmly moved by the damping means S, the elastic pad 60 is prevented from bending by a predetermined displacement or more by the spring base 40 and the damper base 50.

The cover curved portion 83 of the damping means S is in contact with the inner circumferential surface of the damping cap 10 to seal the inner space of the damping cap 10 into which the spring 30 is inserted to generate an air damping force. In addition, frictional damping force due to friction is given during vertical movement. In addition, the bending of the elastic pad 60 is facilitated by the recessed portion 65 of the elastic pad 60, and at this time, even when the maximum bending occurs by the curved portion 83, air leakage is prevented. do.

And the damping means (S) by the cover air gap portion 84 of the damping means (S) is not only easy to insert when inserted into the damping cap 10 of the small diameter, there is no difficulty in positioning, In addition, since the role of the air hole does not process a separate air hole in the damping cap 10, the number of processes can be reduced. In addition, when a large load is applied and the spring 30 is compressed a lot, the inner diameter of the damping cap 10 is formed to be slightly smaller toward the upper side, so that the damping means S moves to the upper side of the damping cap 10. The gap of 84 is gradually reduced to increase the effect of the air damping force, and when the spring 30 is maximally compressed, the air gap 84 is completely blocked to serve as the air spring 30.

The cover 80 of the damping means (S) in contact with the inner circumferential surface of the damping cap 10 is formed of a plastic material not only exhibits a soft damping force than when formed of a rubber material, but also suppresses a decrease in life due to frictional heat. do.

Factors that can change the function of the damper is the diameter of the spring base 40 and the damper base 50, the diameter of the damping cap 10, the diameter and thickness of the damping means (S), the spacing of the holding member 70 The thickness, the thickness and shape of the depression 65, the shape of the cover 80 outer circumference of the damping means S, the shape, number and position of the air gap portion 84, and the like. The outer diameter of the multi-function damping means (S) should be larger than the inner diameter of the damping cap 10, the degree of the size may vary depending on the characteristics of the system, but in the normal state between the damping means (S) and the inner peripheral surface of the damping cap (10) It should be sized so that almost no sliding occurs and only bending occurs.

The present invention not only catches excessive vibration as in the initial stage of dehydration in the washing process, but also catches the vibration generated by the damping force when it is in a normal state, thereby attenuating that the vibration generated in the washing process is transmitted to the outer case (1). It is possible to minimize the generation of vibration noise.

16 and 17 is a graph comparing the transmission force for the damper of the prior art and the present invention, it can be seen that the frequency is reduced in the 50 Hz band.

As described above, the damper of the washing machine according to the present invention transmits the vibration generated in the initial state as well as the vibration generated during the washing of the laundry, in particular, the vibration generated during dehydration to the outer case. By minimizing the amount of vibration, vibration noise generated during the washing process is prevented, thereby improving the reliability of the product.

Claims (7)

A damping cap is formed in a cylindrical shape, one side is opened and the insertion hole is penetrated to the other end, and has a predetermined length and has a predetermined length, and one side is coupled to one side of the outer case in which the outer tank is inserted and the other side is damping. A support rod inserted into the insertion hole of the cap, a spring inserted into the damping cap and inserted into one end of the support rod, a spring base inserted into the support rod so as to be positioned inside the damping cap, and supporting the spring; And a damper base inserted into the support rod to be positioned at a predetermined interval below the spring base and fixed to the end of the support rod, and positioned between the spring base and the damper base and inserted into the support rod to contact the inner circumferential surface of the damping cap. According to the displacement and load, it has variable friction damping force, air damping force and elastic damping force. Multi-function binary damping means, the multi-function damping are respectively inserted between the spring means and the base and between the damping means and the damper base damper of the washing machine characterized in that it comprises a cavity-holding member for holding a gap. The method of claim 1, wherein the multi-function damping means is formed in a disk-shaped body portion having a predetermined thickness and protruding to a predetermined height and area in both sides of the body portion, and a through hole is formed therein in contact with the gap holding member The elastic member is formed to be recessed in a predetermined depth and width in the body portion so as to be positioned around the contact portion and the contact portion formed on the outer peripheral surface of the contact portion and the body portion with a predetermined width and depth to form a depression that facilitates bending. A curved surface formed on the outer circumferential surface of the annular portion and the outer circumferential surface of the annular pad and the mating portion formed to be coupled to the engaging portion of the elastic pad on an inner diameter corresponding to the outer diameter of the elastic pad, and an inner diameter corresponding to the outer diameter of the elastic pad and a predetermined width and thickness. It is made of plastic to form an air gap portion formed to penetrate the portion and the ring portion The damper of the washing machine characterized in that the group type the engagement consisting of a cover which is coupled to the engaging portion of the elastic pad. The damper of claim 1, wherein an outer diameter of the multifunctional damping means is larger than an inner diameter of the damping cap. The damper of claim 1, wherein the depression of the elastic pad is formed in an elliptical shape, and the elliptical shapes are formed at equal intervals. The damper according to any one of claims 1 to 3, wherein the recessed portion of the elastic pad is formed in a circular shape, and the circular parts are formed at equal intervals. The damper of claim 1, wherein several air gaps of the cover are formed at equal intervals. The damper of claim 1, wherein the curved portion of the cover is formed in a two-stage curved surface.