KR20040069876A - Two stage damper and drum type washing machine having the same - Google Patents

Abstract

PURPOSE: A two-stage damper and a drum-type washing machine with the damper are provided to repress the transmission of vibration and reduce noise generated by the vibration transmission by acting friction force over predetermined displacement. CONSTITUTION: A two-stage damper(40) is composed of first and second bodies(41,45) overlapped at the predetermined length along the longitudinal direction and arranged to perform a relative motion along the longitudinal direction; a friction surface(42) formed on an overlapped section of the first and second bodies; a friction member(51) disposed on the overlapped section of the first and second bodies to friction-contact with the friction surface; and a friction member operation unit(55) for preventing the relative motion of the friction surface and the friction member below a first displacement and frictionizing and relatively moving the friction surface and the friction member over the first displacement when one of the first and second bodies moves.

Description

TWO STAGE DAMPER AND DRUM TYPE WASHING MACHINE HAVING THE SAME}

The present invention relates to a two-stage damper and a drum washer having the same, and more particularly, to a two-stage damper and a drum washer having the same to reduce the transmission of vibration by the friction force acting at a predetermined displacement or more.

1 is a view showing an example of a conventional drum washing machine, Figure 2 is an enlarged cross-sectional view of the damper of FIG. As shown in these drawings, the drum washing machine includes a cabinet 11 forming an accommodating space therein, a tub 21 arranged along the front and rear direction inside the cabinet 11 and accommodating the washing water therein; And a drum 22 disposed in the tub 21 so as to be rotatable with respect to the tub 21.

The cabinet 11 has a rectangular parallelepiped shape in which an opening 13 is formed on a front surface thereof so that laundry can enter and exit, and a door 15 is provided at one edge of the opening 13 to open and close the opening 13. Inside the cabinet 11, a tub 21 having a cylindrical shape in which one side is opened to allow laundry to enter and exit is accommodated, and a rotation shaft formed along the front and rear directions of the cabinet 11 in the tub 21. A drum 22 having a cylindrical shape about a line is rotatably coupled.

The rear end of the tub 21 is formed with a spider 23 provided with a bearing 24 so as to rotatably support the rotating shaft 28 of the drum 22, the rear side of the spider 23 drum The drum driving motor 25 is integrally coupled so as to rotate the 22.

Drum drive motor 25, the stator 26 is integrally fixed to the spider 23, and arranged concentrically with each other with a predetermined gap on the outside along the radial direction of the stator 26 and the drum 22 It is provided with a rotor 27 rotatably coupled to the rotation axis of the.

The upper region of the tub 21 is provided with a plurality of support springs 29, one end of which is fixed to the cabinet 11 so that the tub 21 can be suspended from the tub 21, and the tub 21 is disposed below the tub 21. The damper 31 is provided to reduce the vibration width in the vertical direction.

On the other hand, the damper 31, one side is coupled to the cabinet 11 so that the relative movement, the other side has a cylindrical body having a friction surface 33 formed therein, and one side tub 21 The second body 34 is coupled to the relative movement and the other side is predetermined inserted into the first body 32, and between the friction surface 33 of the second body 34 and the first body 32 The friction member 36 is interposed and in contact with the friction surface 33 is provided. An outer groove surface of the second body 34 inserted into the first body 32 is provided with a receiving groove 35 recessed to allow the friction member 36 to be inserted into and coupled to the first body 32. The guide bush 37 is coupled to the opening region of the c) to block a gap with the second body 34.

By the way, in such a conventional drum washing machine, the first body 32 and the second body 34 are formed to be connected to each other via the friction member 36, the large and small generated when the drum 22 is driven Vibration is transmitted to the cabinet 11 through both the tub 21 and the damper 31 has a problem that causes vibration and noise.

In addition, while the drum 22 is dehydrated, the drum 22 passes through an excessive speed section in which vibration is excessively generated in the process of reaching a normal dehydration speed, but the frictional force between the first body 32 and the friction member 36 is always constant. When the frictional force of the friction member 36 is increased according to the relatively large damping force required in the transient speed section, the vibration of the first body 32 is transmitted to the second body 34 in the normal speed section. If the transmission rate of is excessively large, and the frictional force of the friction member 36 is reduced in accordance with the damping force required in the normal dehydration speed section, there is a problem that the transmission rate of the vibration becomes relatively large in the transient speed section.

Accordingly, it is an object of the present invention to provide a two-stage damper capable of suppressing the transmission of vibration by causing a friction force to act at a predetermined displacement or more, and a drum washing machine having the same.

1 is a view showing an example of a conventional drum washing machine,

2 is an enlarged cross-sectional view of the damper of FIG. 1;

3 is a cross-sectional view of the two-stage damper according to one embodiment of the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3;

5 is an enlarged view illustrating main parts of FIG. 3;

6 and 7 are views for explaining the action of the two-stage damper of FIG.

8 is a cross-sectional view of a two-stage damper according to another embodiment of the present invention;

9 is a cross-sectional view of the two-stage damper according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

11: cabinet 21: tub

22: drum 41: the first body

42: friction surface 45: second body

51: friction member 53: support member

55: friction member operating portion 56, 57: working sphere receiving portion

59: sphere of action

According to the present invention, the first body and the second body and a predetermined length section is overlapped in the longitudinal direction and the first body and the second body are arranged to be relatively movable along the longitudinal direction; A friction surface formed in an overlapping region of the first body and the second body; A friction member disposed in an overlapping region of the first body and the second body in frictional contact with the friction surface; When the movement of any one of the first body and the second body in the longitudinal direction of the first body and the second body, the friction surface and the friction member is less than the first displacement so that the relative movement does not occur It is achieved by a two-stage damper, characterized in that it comprises a friction member operating portion for causing the friction surface and the friction member to move relative to the friction above the displacement.

Here, the first body has a cylindrical shape with one side opened so that a friction surface is formed therein, and the friction member is coupled to the circumference of the second body so as to be relatively movable along the longitudinal direction of the second body. It is preferable to have a member.

The friction member operating part protrudes radially from the outer surface of the second body to contact the support member at a first displacement or more from both ends of the support member along the longitudinal direction of the first body and the second body. It is effective to include a pair of jaws.

The friction member operating part includes a protrusion protruding horizontally in the longitudinal direction around the second body, and recessed horizontally in the longitudinal direction on the second body contact surface of the support member to accommodate the protrusion, and above the first displacement. It is preferable to include a receiving portion extending in the longitudinal direction so as to contact each of the protrusions in the.

The friction member operating part includes a slider coupled to the support member and the second body so as to be slidably movable with respect to the support member and the second body along a length direction of the first body and the second body, respectively, It is effective to include a slider accommodating portion recessed to accommodate the slider in the support member and the second body, respectively, and extended to be in contact with both ends of the slider above the first displacement.

It is preferable that the slider is a sphere having a ball shape, and the slider receiving portion is a sphere having a semicircular cross section.

On the other hand, according to another field of the present invention, the cabinet forming an accommodation space therein, the outer tub disposed in the horizontal direction inside the cabinet, and rotates around the rotation axis disposed in the horizontal direction inside the outer tub In the drum washing machine having a drum that is possibly accommodated, one side overlaps a predetermined length section along the longitudinal direction and each other side is coupled to any one of the cabinet and the tub so as to be relative to each other relative movement along the longitudinal direction Two possible first and second bodies; A friction surface formed in an overlapping region of the first body and the second body; A friction member disposed in an overlapping region of the first body and the second body in frictional contact with the friction surface; When the movement of any one of the first body and the second body in the longitudinal direction of the first body and the second body, the friction surface and the friction member is less than the first displacement so that the relative movement does not occur Provided is a drum washing machine having a two-stage damper comprising a two-stage damper having a friction member operating portion for causing the friction surface and the friction member to move relative to each other in displacement.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 is a cross-sectional view of a two-stage damper according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, FIG. 5 is an enlarged view of main parts of FIG. 3, and FIGS. 6 and 7 are respectively. It is a figure for demonstrating the operation | movement of the two stage damper of FIG. The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description, and detailed description thereof will be omitted. As shown in these figures, the two-stage damper 40, the first body 41 and the second body 45 are mutually overlapping with each other in the longitudinal direction and coupled so as to be relatively movable along the longitudinal direction, The friction surface 42 formed in the mutually overlapping area | region of the 1st body 41 and the 2nd body 45, the friction member 51 arrange | positioned in the overlapping area so that the friction surface 42 may contact, and the 1st body When either one of the 41 and the second body 45 vibrates below the first displacement d1 with respect to the other, the relative displacement of the friction surface 42 and the friction member 51 does not occur and the first displacement does not occur. and a friction member operating part 55 for vibrating relative to the friction surface 42 and the friction member 51 when vibrating above (d1). Hereinafter, a case in which the two-stage damper 40 is applied to a drum washing machine, for example, the first body 41 is coupled to the cabinet 11 and the second body 45 is capable of relative movement to the tub 21, respectively. It will be described as an example when combined.

The first body 41 has a cylindrical cylinder shape with one side open, and a friction surface 42 is formed therein along a longitudinal section in the longitudinal direction. A coupling hole 43 is formed through the other side along the longitudinal direction so as to be coupled to the cabinet 11 so as to be able to move relative to the cabinet 11, and the guide bush 44 to block a gap with the second body 45 in the open area. Is provided.

The second body 45 is formed in a rod shape having a reduced outer diameter compared to the inner diameter of the first body 41 so that a predetermined length section can be inserted with a predetermined gap inside the first body 41. On one side, the coupling hole 46 is formed so as to be coupled to the tub 21 so as to be capable of relative movement.

On the other hand, the inside of the first body 41, the friction member 51 is disposed so as to contact the friction surface 42, the friction member 51 is usually implemented in the form of impregnated with grease on the sponge. A support member 53 is provided inside the friction member 51 along the radial direction of the first body 41 so as to support the friction member 51, and the support member 53 has a second body 45. It is formed to have a cylindrical shape so as to be slidably coupled relative to). An insertion groove 54 is recessed in the outer surface of the support member 53 so that the friction member 51 can be inserted at a predetermined depth in the thickness direction, and a contact area between the support member 53 and the second body 45 is formed. The friction member operating portion 55 is formed.

The friction member operating portion 55 includes a ball-shaped working sphere 59 interposed between the supporting member 53 and the second body 45 and a supporting member so as to cooperatively accommodate the working sphere 59. It comprises a functional sphere accommodating part 56 and 57 recessed and formed from each surface of the 53 and the 2nd body 45. As shown in FIG.

Each of the spheres receiving body 56 and 57 is recessed from each surface to a depth corresponding to the radius r of the spheres 59 to slidably receive the spheres 59 and the second body 45. When the displacement (d) to one side of the () is less than the first displacement (d1), the second body 45 is not vibrating the friction member 51 relative to the friction surface 42 and the displacement (d) is In the case of more than one displacement d1, the contact member 59 is contacted and the friction member 51 is moved along the length direction relative to the diameter 2r of the actuating sphere 59 such that the friction member 51 can be moved relative to the friction surface 42. Each is formed to have an extended length. Each of the receptor spheres 56 and 57 corresponds to half (d1 / 2) of the first displacement d1 from the actuator sphere 59 at both ends along the longitudinal direction, respectively, based on the stop of the drum 22. It is formed to have a separation distance.

By such a configuration, when power is applied to the drum driving motor 25 and the drum 22 is rotated, vibration is generated in the drum 22 and the tub 21, and one side is coupled to the tub 21 to allow relative movement. The second body 45 to be vibrated integrally with the tub 21.

When the displacement d to one side of the second body 45 which vibrates integrally with the tub 21 is less than the first displacement d1, as shown in FIG. 6, the support member 53 and the first Since it is hardly transmitted to the body 41, noise generation due to vibration transmission is suppressed.

On the other hand, when the displacement d to one side of the second body 45 is equal to or greater than the first displacement d1, as shown in FIG. 7, the second body 45 is displaced to one side. Is less than the first displacement d1, only the second body 45 and the actuating sphere 59 are moved, and the actuating sphere 59 is in contact with the support member 53 at the first displacement d1 to support the support member ( 53) is moved along the moving direction of the second body (45). As a result, the friction member 51 is in frictional contact with the friction surface 42 and is moved by the difference between the displacement d of the second body 45 and the first displacement d1, thereby resisting the movement of the second body 45. By suppressing the vibration of the second body 45 is suppressed.

8 is a cross-sectional view of the two-stage damper according to another embodiment of the present invention. As shown, the two-stage damper 60 has a cylindrical shape with a cylinder open at one side in a longitudinal direction and a first body 61 having a friction surface 62 formed therein, and a longitudinal direction. A second body 65 having one side inserted into the first body 61 and coupled to be movable relative to the longitudinal direction, a friction member 71 in friction contact with the friction surface 62, and a second When the body 65 vibrates below the first displacement d1, the friction member 71 does not move relative to the friction surface 62 and vibrates above the first displacement d1. It comprises a friction member operating portion 75 to be in relative motion with respect to the friction surface (62).

Coupling holes 63 and 66 are formed in each side of the first body 61 and the second body 65, respectively, and a gap with the second body 65 is formed in the open area of the first body 61. Guide bushes 64 are provided to be blocked.

The inner side of the friction member 71 along the radial direction of the first body 61 is slidably coupled along the longitudinal direction of the second body 65 so that the friction member 71 is inserted into the insertion groove 74. A support member 73 for receiving and supporting is coupled.

On the other hand, the friction member operating portion 75, the second body 65 so as to be in contact with both ends of the support member 73 when the displacement d of the second body 65 is equal to or greater than the first displacement d1. It consists of a pair of hooking projections 77 and 78 of the annular shape which protrudes along the radial direction from the outer diameter surface of (circle), and extends along a circumferential direction. Each of the locking jaws 77 and 78 is formed to have a separation distance corresponding to the first displacement d1 from each end of the support member 73 when the drum 22 is stopped.

9 is a cross-sectional view of the two-stage damper according to another embodiment of the present invention. As shown, the two-stage damper 80, the first body 81 having a cylindrical cylindrical shape of one side is opened along the longitudinal direction, and one side is inserted into the first body 81 to a predetermined depth. A second body 85 which is relatively movable along the longitudinal direction, a friction surface 82 formed inside the first body 81, a friction member 91 in contact with the friction surface 82, and The friction member 91 and the friction surface 82 are comprised by the friction member operation part 95 which operates the friction member 91 so that the friction contact may mutually be above the 1st displacement d1.

On each side of the first body 81 and the second body 85, coupling holes 83 and 86 are formed to penetrate to the cabinet 11 and the tub 21 so as to be relatively movable, respectively. The guide bush 84 is provided in the open area of the first body 81 to block the gap with the second body 85.

A support member 93 is provided inside the friction member 91 along the radial direction of the first body 81 so that the friction member 91 may be inserted and supported, and the support member 93 may include a second member. It is formed in a cylindrical shape to be slidably coupled along the longitudinal direction of the second body 85 around the body 85, the insertion groove 94 is formed recessed so that the friction member 91 can be inserted on the outer surface. .

On the other hand, the friction member operating portion 95 includes a protrusion 96 protruding radially from the outer diameter surface of the second body 85 in the mutual contact area of the second body 85 and the support member 93, Protrusions when recessed from the inner diameter surface of the support member 93 to accommodate the protrusions 96 and the second body 85 vibrates beyond the first displacement d1 along the radial direction of the second body 85 It is comprised by the accommodating part 97 extended along a longitudinal direction so that it may contact each both sides of the 96. The inner walls of both sides of the accommodating part 97 along the longitudinal direction of the second body 85 are spaced apart from the both sides of the protrusion 96 corresponding to the first displacement d1 based on the stop of the drum 22. It is formed to have a distance.

In the embodiment described above with reference to FIGS. 3 to 7, the case in which the action sphere having the ball shape is inserted into the mutual contact area of the second body and the supporting member is described as an example. However, the slider having the rectangular parallelepiped shape is described. It can also be configured in the form.

As described above, according to the present invention, an overlapping region of the first body and the second body, and the first body and the second body, wherein predetermined sections overlap each other along the longitudinal direction and are disposed to be relatively movable along the longitudinal direction. Among the friction surface formed on the friction surface, the friction member is disposed in frictional contact with the friction surface in the overlapping region of the first body and the second body, among the first body and the second body along the longitudinal direction of the first body and the second body. By providing a friction member operating portion to prevent the relative movement of the friction surface and the friction member less than the first displacement during any one movement, and to allow the friction surface and the friction member to move relative to the friction surface above the first displacement. A two-stage damper is provided that can suppress transmission of vibration from one to the other coupled to the vibration source below the displacement.

In addition, according to the present invention, by connecting any one of the first body and the second body to the tub and the other to the cabinet, it is possible to suppress the transmission of the vibration of the tub to the cabinet to suppress the generation of noise due to vibration transmission A drum washing machine having a two-stage damper that can be suppressed is provided.

Claims (7)

A first body and a second body overlapping a predetermined length section along the longitudinal direction and arranged to be relatively movable along the longitudinal direction; A friction surface formed in an overlapping region of the first body and the second body; A friction member disposed in an overlapping region of the first body and the second body in frictional contact with the friction surface; When the movement of any one of the first body and the second body in the longitudinal direction of the first body and the second body, the friction surface and the friction member is less than the first displacement so that the relative movement does not occur Two-stage damper, characterized in that it comprises a friction member operating portion for causing the friction surface and the friction member to move relative to the displacement above. The method of claim 1, The first body has a cylindrical shape with one side opened so that a friction surface is formed therein, and the friction member has a support member coupled to the circumference of the second body to allow relative movement along the longitudinal direction of the second body. Two-stage damper, characterized in that provided. The method of claim 2, The friction member operating part protrudes radially from the outer surface of the second body to contact the support member at a first displacement or more from both ends of the support member along the longitudinal direction of the first body and the second body. Two-stage damper, characterized in that it comprises a pair of locking jaws. The method of claim 2, The friction member operating part includes a protrusion protruding horizontally in the longitudinal direction around the second body, and recessed horizontally in the longitudinal direction on the second body contact surface of the support member to accommodate the protrusion, and above the first displacement. Two-stage damper, characterized in that it comprises a receiving portion extending in the longitudinal direction so as to contact with each of the protrusions. The method of claim 2, The friction member operating part includes a slider coupled to the support member and the second body so as to be slidably movable with respect to the support member and the second body along a length direction of the first body and the second body, respectively, And a slider accommodating portion recessed to accommodate the slider in the support member and the second body, respectively, and extended to be in contact with both ends of the slider above the first displacement. The method of claim 5, The slider is a ball sphere having a ball shape, the slider receiving portion is a two-stage damper, characterized in that the action sphere receiving portion of a semi-circular cross-sectional shape. A drum washing machine having a cabinet defining a receiving space therein, an outer tub disposed in a horizontal direction inside the cabinet, and a drum rotatably received about a rotating shaft disposed in the outer tub in a horizontal direction. In the longitudinal direction, one side overlaps a predetermined length section and each other side is coupled to any one of the cabinet and the tub so as to be able to move relative to the first body and the second body and the relative movement along the longitudinal direction, respectively; ; A friction surface formed in an overlapping region of the first body and the second body; A friction member disposed in an overlapping region of the first body and the second body in frictional contact with the friction surface; When the movement of any one of the first body and the second body in the longitudinal direction of the first body and the second body, the friction surface and the friction member is less than the first displacement so that the relative movement does not occur And a two-stage damper having a friction member operating portion for allowing the friction surface and the friction member to move relative to each other at a displacement or more.