KR20050033225A - Damper of washing machine - Google Patents

Abstract

A damper structure of a washing machine is provided to quickly reduce vibration by making proper damping force act on large vibration and small vibration and to reduce production of noise caused by a collision of components. A damper structure of a washing machine comprises a hollow cylinder(10) connected to one side of a tub and a case; a piston body(20) having one end inserted in the cylinder and the other end connected to the other side of the tub and the case; an extension bar(30) extended from one end of the piston body; a friction ring(40) formed to the separated outside of the extension bar; and a first friction member(21) formed to the outer peripheral surface of the piston body inserted in the cylinder and a second friction member(41) formed to the outer periphery of the friction ring. A fitting projection(31) is formed to the extended end of the extension bar.

Description

Damper structure of washing machine {Damper of washing machine}

The present invention relates to a damper structure, and in detail, the damping force is applied by being divided into multiple stages according to the amount of vibration generated in the washing machine, so that both large and small vibrations can be quickly and properly reduced in a low noise state. It relates to a two-step damper structure of a washing machine.

The washing machine is classified into a drum type, agitator type, and a pulsator type according to a washing method. In particular, the drum type washing machine is provided with a protrusion formed on the inner wall of the drum, so that washing is performed by the impact force of the laundry being lifted up and down along the inner circumferential surface of the drum when the drum rotates.

Such a drum washing machine is less damage to the laundry, there is an advantage that you can use less washing water in recent years, its use is increasing.

1 is a view schematically illustrating a structure of a general drum washing machine.

Referring to FIG. 1, the drum washing machine may further include a case 3 having a hollow rectangular parallelepiped shape, a tub 1 accommodated in the case 3 to contain water, and an inside of the tub 1. And a drum (2) for receiving laundry, and a driving motor (2a) mounted on the rear surface of the tub (1) to rotate the drum (2).

The operation of a general drum washing machine will be described.

First, when the drum 2 is rotated by the rotational force of the drive motor 2a, the laundry accommodated in the drum 2 rotates together. At this time, since the drum 2 is rotated at a low speed, if the laundry is placed on the upper side of the drum 2 while the drum is rotating, the laundry is dropped by gravity and collides with the water contained in the tub 1. The dirt from the laundry is lost by the impact force between the laundry and the washing water generated at this time.

In addition, the weight (4) for correcting the center of gravity in the front and rear / left and right direction of the tub (1) formed on a predetermined side of the tub (outer periphery), the case (3) and the tub (1) Both ends are respectively connected to the spring (5) for buffering the amount of vibration generated in the tub (1) and the drum (2), and both ends are respectively connected to the case (3) and the tub (1) A damper (8) is included to dampen the amount of vibration generated at.

The weight (4) is to adjust the center of gravity of the tub (1), thereby removing the vibration that may be generated due to the eccentric center of gravity of the tub (1).

In addition, the amount of vibration generated by the operation of the tub 1 is buffered by the spring 5 and attenuated by the damper 8 so that the amount of vibration generated during the operation of the tub 1 is rapidly attenuated. .

In detail, the damper 8 includes a cylinder 6 having one end connected to the tub 1 side, and a piston rod 7 having one end connected to the case 3 side and inserted into the cylinder 6. Included.

2 is a cross-sectional view of a general damper.

Referring to FIG. 2, the general damper 8 is formed with a cylinder 6 and a piston rod 7 having a predetermined portion inserted therein as described above. In addition, a tub side fastener 61 for connecting the cylinder 6 to the tub 1, a case side fastener 71 for connecting the piston rod 7 to the case 3, and the piston rod. The friction member 9 is formed at one end of the cylinder 7 to perform frictional action with the inner circumferential surface of the cylinder 6, and is further formed inside the piston rod 7 to compress the air inside the cylinder 6. Aeration holes 72 are included to avoid this.

The operation of the damper 8 will be described with reference to the configuration of the damper 8 as described above.

When a certain amount of vibration occurs in the tub 1 and the drum 2, a relatively different positional displacement occurs between the inner circumferential surface of the cylinder 6 and the outer circumferential surface of the piston rod 7. And, by the friction member 9 formed between the cylinder 6 and the piston rod 7, the vibration is changed into frictional heat and attenuated.

In addition, in order to prevent the damper 8 from being damaged when the tub 1 swings back, forth, left, and right, the tub side fastener 61 and the case side fastener 71 are formed with predetermined holes illustrated in a circle. And is fixed to the tub 1 and the case 3 in a state where movement is possible. In addition, the vent 72 may be configured such that, when the piston rod 7 is moved to the left with reference to the drawings, the air escapes to the outside to prevent the air inside the cylinder 6 from being compressed to weaken the damping force. Make a passage.

On the other hand, the drum washing machine is a case where a large amount of vibration and a small amount of vibration is generated can be generated both cases. For example, since the drum rotational speed is severely changed in the intermittent dehydration section in the dehydration section, a large amount of vibration is generated. In addition, since the change of the drum rotational speed is not severe in the separation section, a small vibration amount is generated.

However, the same damping force is always generated by the conventional damper 8 as described in the drawing. Therefore, in the case where a small amount of vibration is generated, the damper 8 acts as a rigid body so that it is not possible to quickly attenuate the amount of vibration, and the noise is also large. When a large vibration amount is generated, not only the vibration amount can be quickly attenuated by the vibration amount exceeding the displacement limit of the damper 8, but also the damper 8 is broken. In view of this, it is common for the conventional damper 8 to form the damper 8 so as to be suitable when a large amount of vibration is generated.

As such, the conventional damper cannot actively cope with a change in the amount of vibration, and thus has a disadvantage in that noise and vibration are severely generated and inconvenience in use increases.

In other words, a large damping force is applied to a section where a large amount of vibration is generated so that the amount of vibration is rapidly attenuated, and a small damping force is generated in a section where a small amount of vibration is generated, thereby quickly reducing vibration and reducing noise. It must be.

The present invention has been proposed in order to solve the problems as described above, washing machine that can reduce the amount of vibration quickly by applying an appropriate damping force, respectively, when a large amount of vibration and a small amount of vibration is generated The purpose is to provide a damper.

In addition, the present invention provides a damper of the washing machine to reduce the amount of noise that can be generated due to the impact of other components when the vibration is generated by applying a damping force to the damping force is quickly attenuated by the damper. It aims to provide.

Moreover, an object of this invention is to provide the damper of the washing machine which can prevent the damage of a damper even when a strong vibration amount is generated.

Damper structure of the washing machine according to the present invention for achieving the object as described above is a hollow cylinder connected to one side of the tub and the case; A piston body having one end inserted into the cylinder and the other end connected to the other side of the tub and the case; An extension bar extending further from one end of the piston body and having a locking end formed at the extension end; A friction ring formed on a spaced outer side of the extension bar; And a second friction member formed on an outer circumference of the friction ring and a first friction member formed on an outer circumferential surface of the piston body inserted into the cylinder.

Damper of the washing machine according to the invention according to another aspect is a hollow cylinder; A piston body having one end inserted into the cylinder and having a friction member formed on an outer circumference of the portion to be inserted into contact with the cylinder; An extension bar further extending from one end of the piston body, the engaging end being formed at the extension end; And a friction ring that is formed between the end of the extension bar and the end of the piston body, is freely movable with respect to the extension bar, and is in contact with the cylinder by another friction member formed on an outer circumference thereof.

By the damper structure of the washing machine as proposed, it is possible to quickly reduce the amount of vibration generated in the washing machine in a low noise state. In addition, damage to the damper can also be prevented.

Hereinafter, with reference to the drawings propose a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the present embodiment, and those skilled in the art will be able to easily propose another embodiment by adding, deleting, or modifying the elements in the present embodiment.

3 is a cross-sectional view of the washing machine damper according to the spirit of the present invention.

Referring to Figure 3, the damper of the present invention is coupled to the piston body 20, the piston body 20 is inserted into the inner hollow portion of the cylinder 10, the piston body 20 is empty inside the An extension bar 30 further extending from the piston body 20, and is formed to maintain a predetermined interval between the outer circumference of the extension bar 30 and an interview with an inner circumferential surface of the cylinder 10. Circular friction ring 40 is included.

In addition, the tub-side fixture 11 is formed at one end of the cylinder 10 to be connected to the tub of the washing machine, and the case is formed at one end of the piston body 20 to be connected to the case of the washing machine. A plurality of side fasteners 24, a first friction member 21 formed on the outer circumference of the other end of the piston body 20 and causing friction with the inner circumferential surface of the cylinder 10, and on the outer circumferential surface of the piston body 20 Is formed to be long and includes a heat radiation fin 22 for releasing frictional heat. In particular, the first friction member 21 may be formed at the left end of the piston body in order to maximize the moving distance of the piston body 20.

In addition, the second friction member 41 is formed on the outer circumferential surface of the friction ring 40 to cause friction with the inner circumferential surface of the cylinder 10. The first and second friction members 21 and 41 may be configured to have a lubricant applied to a predetermined porous plastic. In addition, the lubricant may be grease.

In addition, an elastic deformation tool 32 formed at one end of the extension bar 30, and a locking groove 23 is inserted into the elastic deformation tool 32 is included. In addition, the other end of the extension bar 30, the friction ring 40 is caught when the piston body 20 moves to the right with reference to the drawings, that is, when the cylinder 10 moves to the left with reference to the drawings. It includes a locking end 31 to make.

The operation of the washing machine damper according to the spirit of the present invention will be briefly described.

While the tub-side fixture 11 is connected to the tub of the washing machine, and the case-side fixture 24 is connected to the case, the amount of vibration generated by the washing machine is operated through the tub-side fixture 11. Delivered to the damper. Therefore, the vibration amount generated in the washing machine causes the displacement of the cylinder 10, and moves relative to the piston body 20 fixed to the case and stopped.

When the cylinder 10 moves, the amount of vibration is attenuated by a damping force caused by frictional force generated between the inner circumferential surface of the cylinder 10 and the first friction member 21. On the other hand, when the vibration is severely generated and the displacement of the cylinder 10 is large, the friction ring 40 is brought into contact with the left end of the engaging end 31 and the piston body 20, the second friction member The friction force is generated in the same mechanism as the first friction member 21 at 41.

That is, when the vibration amount is small and the displacement of the cylinder 10 is small, the friction force is applied only between the inner circumferential surface of the cylinder 10 and the first friction member 21 to generate a small damping force. However, when the amount of vibration is large and the displacement of the cylinder 10 is large, not only between the inner circumferential surface of the cylinder 10 and the first friction member 21, but also the inner circumferential surface of the cylinder 10 and the second friction member 41. Friction force is generated between Therefore, greater damping force is generated.

Thus, when the vibration amount is small, a small friction force or a small damping force is applied, and when the vibration amount is large, a large friction force or a large damping force is applied, so that an appropriate damping force is applied according to a specific case depending on the magnitude of the vibration amount. For example, when a large amount of vibration is generated, such as a section of intermittent dehydration, the amount of vibration is large, and a frictional force is generated on both the first friction member 21 / the second friction member 41 and the inner circumferential surface of the cylinder 10 to generate a strong vibration. Damping force is generated. However, when a small amount of vibration such as a main detachment section is generated, the amount of vibration is small, and a frictional force is generated only between the first friction member 21 and the inner circumferential surface of the cylinder 10 to generate a small damping force.

On the other hand, the elastic deformation sphere 32 is an article formed for the stable assembly of the extension bar 30 and the piston body 20, the friction ring 40 is extended after being fitted to the extension bar 30, The bar 30 can be fixed to the piston body 20 as a whole. In other words, after the friction ring 40 is inserted into the outer circumference of the extension bar 30, one end of the extension bar 30 is fitted into the piston body 20 so that the elastic deformation tool 32 is elastically deformed. Then, after the extension bar 30 is inserted to the end to reach the position where the locking groove 23 and the elastic deformation sphere 32 are aligned, the elastic deformation sphere 32 is restored and inserted into the locking groove 23. You lose. By this coupling process, the extension bar 30 and the piston body 20 can be completely fixed.

4 is a view illustrating a case in which a contracting force is applied to the damper of the washing machine according to the present invention, and FIG. 5 is a view illustrating a case in which a tensile force is applied to the damper of the washing machine according to the present invention.

Referring to FIGS. 4 and 5, the operation of the damper according to the present invention will be described. First, when the contracting force is applied, the cylinder 10 is moved in the right direction (arrow direction in FIG. 4). When the cylinder 10 is moved in the right direction, since the first friction member 21 is stopped, frictional force is generated on the contact surface between the inner circumferential surface of the cylinder 10 and the first friction member 21. . However, the second friction member 41 and the friction ring 40 move to the right as with the cylinder 10.

Furthermore, when the moving distance of the cylinder 10 exceeds L1, the left end of the piston body 20 and the right end of the friction ring 40 come into contact, so that the friction ring can no longer be moved together with the cylinder 10. Therefore, the frictional force applied to the cylinder 10 from this time is a frictional force combined with the frictional force of the first friction member 21 and the second friction member 41 is applied.

In addition, when a tensile force is applied to the damper, the cylinder 10 is moved to the left direction (arrow direction in FIG. 5). When the cylinder 10 is moved in the left direction, since the first friction member 21 is stopped with respect to the cylinder 10, between the inner circumferential surface of the cylinder 10 and the first friction member 21. Friction force is generated on the contact surface. However, the second friction member 41 and the friction ring 40 move to the left side like the cylinder 10.

Subsequently, when the cylinder 10 is moved and the moving distance of the cylinder 10 exceeds L2, the locking end 31 and the left end of the friction ring 40 come into contact, so that the friction ring is no longer connected with the cylinder 10. It cannot be moved together. Therefore, the frictional force applied to the cylinder 10 from this time is a frictional force combined with the frictional force of the first friction member 21 and the second friction member 41 is applied.

6 is a graph illustrating the relationship between the displacement of the cylinder and the damping force in the washing machine damper according to the spirit of the present invention.

Referring to FIG. 6, the displacement L of the cylinder is set as the horizontal axis, and the damping force F by the damper is set as the vertical axis.

Specifically, when the cylinder 10 is moved to the right side (in the direction of the arrow in FIG. 4) by a force applied from the outside, the weak frictional force by the first friction member 21 until the predetermined distance L1 is reached. Only damping force F1 due to is applied. In addition, when the cylinder 10 is moved beyond the predetermined distance L1, the damping force F1 + F2 is applied due to the strong frictional force of the first friction member 21 and the second friction member 41. do. Therefore, the weak damping force is applied to the weak vibration with small displacement, so that the vibration can be quickly attenuated in the absence of noise. In addition, the strong damping force is applied to the strong vibration force having a large displacement, so that the greater friction force and the damping force are applied, so that the vibration can be quickly attenuated without damaging the noise and the damper.

In addition, when the cylinder 10 is moved to the left side (in the direction of the arrow of 5) by the force applied to the outside, it is caused by the weak frictional force by the first friction member 21 until it reaches a certain distance L2. Only damping force F1 is applied. And, when the cylinder 10 is moved to the left side beyond the predetermined distance (L1), the damping force (F1 + F2) caused by the strong friction force by the first friction member 21 and the second friction member 41 Can be applied. Therefore, the weak damping force F1 is applied to the weak vibration with small displacement, so that the vibration can be quickly attenuated in the absence of noise. In addition, the strong damping force (F1 + F2) is applied to the strong vibration force with a large displacement, the vibration can be quickly attenuated by the larger friction force and damping force without damaging the noise and damper.

That is, by applying different damping force to the damper according to the vibration amount and the magnitude of the displacement, it is possible to quickly damp the vibration in the absence of noise for any vibration.

7 is a view for explaining another embodiment according to the spirit of the present invention.

Referring to FIG. 7, the present embodiment is largely the same as the original embodiment, except that the friction member formed on the outer circumferential surface of the friction ring 40 is not only the second friction member 41 but also the third friction member ( There is a difference in that 42) is formed. By doing this, there is an effect that the damping force that can be applied by the damper as a whole becomes larger.

In other words, the same damping force F1 as in the original embodiment is applied until the predetermined distance L1 or L2 is reached. When the predetermined distance L1 or L2 is exceeded, a damping force greater than the damping force F1 + F2 according to the first embodiment is applied, whereby the amount of vibration can be attenuated more quickly.

The idea of the present invention relates to a damper of a washing machine for reducing the amount of vibration generated by the operation of the washing machine, and different frictional and / or damping forces are applied by the damper according to the displacement caused by the amount of vibration and the amount of vibration. By doing so, it is possible to quickly attenuate the vibration generated by the operation of the washing machine in a low noise state.

On the other hand, the embodiments of the present invention are described in that the cylinder is connected to the tub side, the piston body is fixed to the case side, but these forms may be interchanged, even if so configured, in the practice of the present invention There is no problem.

By the damper of the washing machine according to the present invention, when a large amount of vibration is generated during operation of the washing machine and a small amount of vibration is generated, an appropriate damping force is applied to each other, thereby quickly reducing the amount of vibration generated in the washing machine. It works.

In addition, the present invention is applied to the appropriate damping force according to the amount of vibration so that the amount of vibration is quickly attenuated, it is possible to reduce the amount of noise generated due to the collision between the washing machine parts during the generation of vibration to improve the comfort of using the washing machine It can work.

In addition, the present invention has the effect of preventing damage to the damper even when a large displacement of the damper is generated by the strong vibration amount.

1 is a view schematically illustrating a structure of a general drum washing machine.

2 is a cross-sectional view of a general damper.

3 is a cross-sectional view of the washing machine damper according to the spirit of the present invention.

4 is a view for explaining the case that the contracting force is applied to the damper of the washing machine according to the present invention.

5 is a view for explaining a case in which a tensile force is applied to the damper of the washing machine according to the present invention.

6 is a graph illustrating a relationship between a displacement of a cylinder and a damping force in a washing machine damper according to the spirit of the present invention.

7 is a view for explaining another embodiment according to the spirit of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 cylinder 20 piston body 30 extension bar

40: friction ring

Claims (8)

A hollow cylinder connected to one side of the tub and the case; A piston body having one end inserted into the cylinder and the other end connected to the other side of the tub and the case; An extension bar extending further from one end of the piston body and having a locking end formed at the extension end; A friction ring formed on a spaced outer side of the extension bar; And a second friction member formed on an outer circumference of the friction ring and a first friction member formed on an outer circumferential surface of the piston body inserted into the cylinder to reduce vibration of the washing machine. The method of claim 1, The friction member is a damper of a washing machine, characterized in that the lubricant is applied to the porous plastic. The method of claim 1, The first friction member is a damper of the washing machine is formed in the insertion end of the piston body. The method of claim 1, At least one second friction member is formed damper of the washing machine. The method of claim 1, The piston body and the extension bar is a damper of the washing machine is a separate article is coupled by a predetermined locking structure. The method of claim 1, The first friction member and / or the second friction member damper of the washing machine causing a friction action with the inner peripheral surface of the cylinder. The method of claim 1, The cylinder damper of the washing machine connected to the tub. Hollow cylinder; A piston body having one end inserted into the cylinder and having a friction member formed on an outer circumference of the portion to be inserted into contact with the cylinder; An extension bar further extending from one end of the piston body, the engaging end being formed at the extension end; And A friction ring formed between the end of the extension bar and the end of the piston body, freely movable with respect to the extension bar and contacting the cylinder by another friction member formed on an outer circumference thereof to reduce vibration of the washing machine. Damper of washing machine.