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Damper for damping vibration and washing machine having the same

a technology of damper and damper cylinder, which is applied in the direction of spring/damper, other washing machines, textiles and paper, etc., can solve the problems of increasing vibration and noise, increasing the friction force as time goes, etc., and achieves the effect of increasing the friction force between the friction member and the inner wall of the damper cylinder

Inactive Publication Date: 2006-01-19
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031] An object of the present invention is to provide a damper having a structure for minimizing the transmission of vibration and a washing machine having the same.
[0037] When the first and second pressure members are close to each other, the frictional force between the friction member and the inner wall of the damper cylinder is increased.
[0044] In the case that the pressure unit includes a plurality of slip members, the pressure unit may further include guide ribs provided on the outer cylindrical surface of at least one of the first and second pressure members for preventing the concentrated movement of the slip members in the circumferential direction.

Problems solved by technology

On the other hand, when the tub 20 is supported by the damper having a high damping force, the TR force is increased as time goes by, thereby continuously increasing the vibration and noise.

Method used

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  • Damper for damping vibration and washing machine having the same
  • Damper for damping vibration and washing machine having the same
  • Damper for damping vibration and washing machine having the same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0076] First, with reference to FIGS. 4 to 8, a damper in accordance with the present invention will be described.

[0077] Here, FIG. 4 is a sectional view of the damper in accordance with the first embodiment of the present invention. FIGS. 5A and 5B are a partial and longitudinal sectional view and a transversal sectional view illustrating a friction member of the damper shown in FIG. 4, which is separated from the inner wall of a damper cylinder. FIGS. 6A and 6B are a partial and longitudinal sectional view and a transversal sectional view illustrating the friction member of the damper shown in FIG. 4, which contacts the inner wall of the damper cylinder. FIG. 7 is a sectional view of another embodiment of a pressure unit of the damper of the present invention. FIG. 8 is a perspective view of yet another embodiment of the pressure unit of the damper of the present invention.

[0078] The damper of the present invention, which will be described hereinafter, may be applied to general w...

second embodiment

[0142] First, a damper 600a in accordance with the present invention will be described with reference to FIGS. 9A and 9B.

[0143] With reference to FIGS. 9A and 9B, the damper 600a comprises a connection rod 744 passing through the first pressure member 641 and the second pressure member 642 and vertically moving.

[0144] For this reason, vertical guide holes (not shown) are respectively formed through central portions of the first and second pressure members 641 and 642.

[0145] Here, the diameter of the guide holes formed through the first and second pressure members 641 and 642 is larger than that of the connection rod 744.

[0146] The lower end of the connection rod 744 is connected to an actuator (not shown), and is connected to a wire 745 for drawing the connection rod 744 downwardly.

[0147] A head 744a having a diameter larger than that of the guide hole of the second pressure member 642 is formed on the upper end of the connection rod 744.

[0148] Accordingly, when the wire 745 dr...

third embodiment

[0152] Hereinafter, a damper 600b in accordance with the present invention will be described with reference to FIGS. 10A and 10B.

[0153] With reference to FIGS. 10A and 10B, the damper 600b comprises a connection rod 844 passing through the first pressure member 641 and connected to the second pressure member 642 in order to vertically move the second pressure member 642.

[0154] More specifically, the connection rod 844 vertically passes through the second pressure member 642.

[0155] For this reason, vertical guide holes (not shown) are respectively formed through central portions of the first and second pressure members 641 and 642.

[0156] Particularly, a female screw thread is formed in the guide hole of the second pressure member 642, and a male screw thread corresponding to the female screw thread is formed on the outer cylindrical surface of the connection rod 844. The female screw thread of the guide hole of the second pressure member 642 is engaged with the male screw thread o...

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PUM

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Abstract

A damper for damping vibration and a washing machine having the same are disclosed. The damper includes a damper cylinder; a shaft inserted into the damper cylinder through one end of the damper cylinder, and reciprocating in the lengthwise direction of the damper cylinder; and a friction member provided on the shaft for damping vibration generated by friction with the inner wall of the damper cylinder, and moving vertically to the lengthwise direction of the damper cylinder. The damper adjusts damping force thereof according to vibrated states of an object to be vibrated, and has an improved vibration-damping effect.

Description

[0001] This application claims the benefit of Korean Patent Application Nos. 10-2004-0054423, 10-2004-0054424, 10-2004-0054425 and 10-2004-0054426, filed on Jul. 13, 2004, which are hereby incorporated by references as if fully set forth herein. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a damper for damping vibration, and more particularly, to a damper, the damping force of which is adjustable, and a washing machine having the same. [0004] 2. Discussion of the Related Art [0005] Generally, a washing machine performs washing, rinsing, and dehydrating operations by filling the lower portion of the inside of a tub with water and detergent, placing laundry in a drum installed in the tub, and rotating the drum. [0006] Such a washing machine is an apparatus for eliminating dirt from laundry using proper detergent and mechanical force. [0007] Accordingly, the washing machine usually comprises a cabinet forming an external appearanc...

Claims

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Application Information

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IPC IPC(8): D06F29/00
CPCD06F37/20D06F37/22F16F7/09F16F7/082D06F2220/00
Inventor PARK, GWAN RYONGPARK, SEUNG CHULKIM, JAE HYUNKIM, SUNG MINJEON, SI MOON
Owner LG ELECTRONICS INC
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