JP2005245578A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noises in a washing machine employing an oil damper mechanism for a vibration-proof damper. <P>SOLUTION: The washing machine comprises oil 22, a high-pressure gas 23, a piston 26, a slider 33, a metal 34, and an oil sealing member 35 in the cylinder 21 of the oil damper mechanism 24. The washing machine also comprises a piston rod 27 connected to the piston 26 and projecting downward from the cylinder 21, and a coiled spring member 25 arranged around the piston rod 27. Sealing grease 43 is injected into the oil sealing member 35 and grease 44 containing molybdenum is provided in the extension cylinder 38 of the cylinder 21 and adjacent to the outer side of outer sealing lip 42 of the oil sealing member 35. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a washing machine having an oil damper mechanism as an anti-vibration damper for supporting a water tank in an anti-vibration state.

  Among the washing machines, the drum-type washing machine is a washing machine accommodated in a drum by rotating a drum, which serves as a washing tub and a dewatering tub, arranged in a water tub about an axis oriented in a substantially horizontal direction. The structure is configured such that a vertical movement is given to the object and the object is washed by so-called tapping. Since the moisture-containing laundry tends to collect on the lower side of the drum, a plurality of baffles are provided in the drum to lift it up. When washing, the baffle lifts the laundry in the washing liquid, and when it reaches a certain height, it slides down the slope of the baffle and falls into the lower washing liquid, and this dropping force gives the energy to tap. . During dehydration, after the washing liquid is drained, the drum is first rotated at a rotational speed as low as about 40 rpm. When the washing liquid contained in the laundry is removed by the rotation and the moisture is reduced to some extent, the drum is further rotated. By increasing the speed and sticking the laundry almost uniformly in the drum, the dehydration process is started.

Here, the ability to hold water differs depending on the material and thickness of the laundry. For this reason, at the time of dehydration, the laundry and the distribution of moisture contained in the laundry become non-uniform, and a certain amount of unbalanced weight is inevitably generated in the drum. If dehydration is started in this state, a large vibration will be transmitted to the floor.
On the other hand, this type of drum-type washing machine was first implemented in Europe, but European houses are often made of solid stone floors. The large centrifugal force and the resulting large vibration are forced to be suppressed by the weight of the product. For this reason, a heavy washing machine having a product weight exceeding 80 kg to 100 kg is usually used while it is a drum type washing machine having a small washing capacity of 4.5 kg to 5 kg.

  However, in Japan, there are many houses made of wood, and it is difficult to adopt a method in which dehydration vibration of a drum type washing machine is suppressed by weight. In other words, with the system that suppresses vibration by weight as in Europe, the vibration as a product can be reduced, but the transmission force to the floor cannot be reduced, and the weight of the product is the floor on which the product is placed. The problem is that the floor is easy to hurt by concentrating on the narrow part of the floor. In addition, European washing machines generate a lot of noise during dehydration and have been accepted at 55 dB (A) to 70 dB (A) or more (depending on the manufacturer). On the other hand, in Japanese drum-type washing machines, a liquid balancer is used, or the unbalance of the generated laundry is detected by a microcomputer, and when the unbalance becomes small, dewatering speed is increased. ing.

However, the increase in washing capacity has become a trend in the world, and with the recognition that the conventional 5 kg capacity is insufficient, the drum type washing machine with a washing capacity of 8 kg is becoming mainstream in Japan. Increasing the size is considered to be the future trend including Europe and America. In addition, although product noise is accompanied by vibration, it is a big problem in Japan, where there are many small houses.
Conventionally, in this type of drum type washing machine, a piston friction type damper is used as an anti-vibration damper for supporting a water tank with a spring and suppressing vibration at the time of resonance in order not to transmit vibration during dehydration to the floor. (For example, see Patent Document 1). However, with this piston friction type damper, a phenomenon has arisen in which vibration of an increasing drum type washing machine cannot be sufficiently suppressed.

In view of such a situation, the applicant has proposed to use an oil damper mechanism in which oil is sealed in a cylinder of a vibration damper (see, for example, Patent Document 2). With the increase in size of drum-type washing machines, oil damper mechanisms are used in almost all new products that are currently being developed. In the oil damper mechanism, a piston slidably provided in the cylinder moves relatively up and down, but oil and high-pressure gas are sealed in the cylinder. The piston has a plurality of small holes, and oil passes through the holes as the piston moves and generates a damping force due to the fluid loss. doing.
JP-A-6-63291 JP 2002-346282 A

By adopting an oil damper mechanism as a vibration damping damper, the vibration amplitude at the time of resonance can be greatly reduced, but the noise value cannot be greatly reduced.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a washing machine that can reduce noise caused by vibration in the case where an oil damper mechanism is adopted as a vibration-proof damper.

  The present inventors have found that the following point is one of the causes of noise in the case where the oil damper mechanism is adopted as the vibration damping damper. That is, in the oil damper mechanism, an oil seal member is provided inside the cylinder and on the opening side of the cylinder. This oil seal member is for preventing the oil in the cylinder from leaking to the outside, and is in sliding contact with the outer peripheral surface of the piston rod that moves relative to the piston. In this case, the oil seal member needs to make a fairly tight contact with the outer peripheral surface of the piston rod in order to prevent the oil in the cylinder from leaking to the outside. For this reason, it has been found that a relatively large noise is generated between the oil seal member and the outer peripheral surface of the piston rod when vibration is generated.

Therefore, in order to achieve the above object, in the first aspect of the present invention, a water tub disposed in a casing, a washing tub disposed in the water tub, and the water tub are supported in a vibration-proof state. The vibration damping damper is configured to include an oil damper mechanism in which oil is enclosed in a cylinder and a piston is relatively slid in the cylinder. In the washing machine
The oil damper mechanism includes an oil seal member that is positioned inside the cylinder and on the opening side of the cylinder and that is in sliding contact with an outer peripheral surface of a piston rod that moves together with the piston. An extension tube portion projecting toward the outer side in the axial direction than the oil seal member is integrally formed at the end portion on the side,
Grease is provided inside the extension tube portion and in the vicinity of the outer side in the axial direction of the oil seal member.

In order to achieve the same object, the invention of claim 5 supports a water tub disposed in a housing, a washing tub disposed in the water tub, and the water tub in a vibration-proof state. And the anti-vibration damper includes an oil damper mechanism in which oil is sealed in a cylinder and a piston is relatively slid in the cylinder. In the washing machine,
The oil damper mechanism includes an oil seal member that is positioned inside the cylinder and on the opening side of the cylinder and that is in sliding contact with an outer peripheral surface of a piston rod that moves together with the piston. An extension tube portion projecting toward the outer side in the axial direction than the oil seal member is integrally formed at the end portion on the side,
A grease containing molybdenum is provided between the oil seal member and the outer peripheral surface of the piston rod.

According to the first aspect of the present invention, when the grease is provided in the extension tube portion and in the vicinity of the outer side in the axial direction of the oil seal member, the oil seal member and the piston rod are relatively slidably moved. The frictional resistance is reduced, and in particular, the change in the friction coefficient between static friction and dynamic friction is reduced, so that the generation of noise can be reduced as much as possible.
According to the fifth aspect of the present invention, since the grease containing molybdenum is provided between the oil seal member and the outer peripheral surface of the piston rod, the oil seal member and the piston rod are relative to each other as in the first aspect of the present invention. Thus, the frictional resistance during sliding movement is reduced, and particularly the change in the coefficient of friction between static friction and dynamic friction is reduced, so that the generation of noise can be reduced as much as possible.

  A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 3 shows an external perspective view of the drum type washing machine of the present invention. In FIG. 3, the housing 1 is composed of an outer box 2 that forms left and right side surfaces and a back surface, a front lid 3 that forms a front surface, and a top cover 4 mounted on the upper portion thereof. A laundry doorway 5 is formed in the top cover 4, and the laundry doorway 5 is opened and closed by a laundry lid 6. In this case, the washing lid 6 includes a sliding front lid 7 and a rear lid 8, respectively. Each of the front lid 7 and the rear lid 8 is configured by connecting a plurality of horizontally long lid element members 9. An operation panel 10 is provided on the right front portion on the top surface of the top cover 4.

  On the other hand, a water tank 11 is disposed inside the housing 1 as shown in FIG. This water tank 11 is supported in a vibration-proof state by a vibration-proof damper 13 provided between the water tank 11 and the base plate 12 to be described later. In this case, the anti-vibration dampers 13 are provided at two locations, the front portion and the rear portion of the water tank 11. Inside the water tub 11, a drum 14 serving as both a washing tub and a dewatering tub is disposed. The drum 14 is rotatably supported by the water tank 11 via a shaft (not shown) provided at the rotation center O and is rotated by a motor (not shown). A number of holes are formed in the drum 14. A plurality of baffles 16 are provided in the drum 14. An inner lid 17 is provided at the upper part of the water tank 11 so that it can be opened and closed, and a drum lid 18 is provided at the outer periphery of the drum 14 so as to be opened and closed.

When the laundry is put into and taken out of the drum 14, the washing lid 6, the inner lid 17, and the drum lid 18 are opened with the drum 14 stopped at a position where the drum lid 18 is located at the upper part. In the state. In addition, the washing operation and the dehydrating operation are performed by rotating the drum 14 in a state where the washing lid 6, the inner lid 17, and the drum lid 18 are closed.
Now, the anti-vibration damper 13 will be described with reference to FIGS. Since the front vibration damping damper 13 and the rear vibration damping damper 13 have the same configuration, one vibration damping damper 13 will be described as a representative.

The anti-vibration damper 13 is generally provided on a coaxial line in a so-called oil damper mechanism 24 in which an oil 22 and a high-pressure gas 23 of about 5 atm are enclosed in a cylindrical cylinder 21 and an outer lower side thereof. The coil-shaped spring member 25 is formed.
Of these, the oil damper mechanism 24 includes a piston 26 that is slidable in the axial direction inside the cylinder 21 and a piston rod 27 to which the piston 26 is attached. 27 protrudes below the cylinder 21. A plurality of holes 28 are formed in the piston 26. A rod 29 is fixed to the upper part of the cylinder 21, and the tip of the rod 29 is fixed to a support plate 30 provided at the lower part of the water tank 11. Further, the lower end portion of the piston rod 27 is fixed to the base plate 12 via a support portion 31.

  Inside the cylinder 21, a cylindrical slider 33, a metal 34, an oil seal member 35, and a presser plate 36 are accommodated so as to be positioned below the oil 22. A fixed portion 37 is formed in the cylinder 21 at a portion corresponding to the slider 33, and the position of the slider 33 in the axial direction is fixed by the fixed portion 37. Further, an extended cylindrical portion 38 projects from the lower end portion side that is the opening portion side of the cylinder 21 toward the outer side in the axial direction (lower side) than the oil seal member 35. The extension cylinder part 38 is narrowed so as to be thinner than the main body part of the cylinder 21, and the position of the presser plate 36 and the oil seal member 35 below is regulated by the step part of the extension cylinder part 38. Yes. Therefore, the position of the slider 33, the metal 34, the oil seal member 35, and the presser plate 36 in the cylinder 21 in the cylinder 21 is regulated by the stepped portions of the fixed portion 37 and the extension cylinder portion 38.

  The slider 33 is made of, for example, a synthetic resin POM (polyacetal). The oil seal member 35 is formed in a state where a metal insert member 40 is embedded, for example, by NBR (nitrile rubber). The oil seal member 35 integrally includes an inner seal lip 41 protruding toward the upper side (the metal 34 side) and an outer seal lip 42 protruding toward the lower side, and these inner and outer seal lips. The tip portions of 41 and 42 are in sliding contact with the outer peripheral surface of the piston rod 27. A small amount of seal grease 43 is injected on the inner surface side of the oil seal member 35 (the inner surface side between the inner seal lip 41 and the outer seal lip 42).

  In this case, the inner seal lip 41 is configured to prevent oil leakage from the inner seal lip 41 by applying an internal pressure (see arrow F in FIG. 1) due to the high pressure gas from the outer periphery of the inner seal lip 41. Also, the outer seal lip 42 is configured to tightly tighten the outer peripheral surface of the piston rod 27 in order to seal the high-pressure gas. Usually, since the seal is used for the purpose of preventing internal or external liquid leakage or liquid intrusion, no particular attention is paid to the direction not targeted.

  In the present embodiment, the grease 44 is positioned inside the extension cylinder portion 38 of the cylinder 21 and outside the outer seal lip 42 of the oil seal member 35 (near the axially outer side of the oil seal member 35). Injecting. As the grease 44, a lithium-based grease having a normal lithium soap has a certain effect, but a grease mixed with molybdenum can obtain a higher effect. As the grease 44, it is preferable to use a grease having a grease consistency of 220 to 250 (see FIG. 5).

  A spring receiving member 45 is attached to the outside on the lower side of the cylinder 21, and the upper end portion of the spring member 25 is received by the spring receiving portion 46 of the spring receiving member 45. An opening 47 is formed at the bottom of the spring receiving member 45. A convex portion 48 projecting sideways is provided on the outer peripheral portion of the lower portion of the piston rod 27, and the lower end portion of the spring member 25 is moved by the lower spring receiving member 49 whose position is regulated by the convex portion 48. It has been received.

Next, the operation of the above configuration will be described.
When washing is performed, first, the laundry is opened in the drum 14 by opening the washing lid 6, the inner lid 17, and the drum lid 18. Then, after the detergent is introduced and water is supplied into the water tank 11 and thus into the drum 14, the drum 14 is rotated. Along with this, the laundry in the drum 14 is lifted by the baffle 16, and when the rotation angle increases, the laundry slides on the slope of the baffle 16, falls into the washing liquid in the lower part of the drum 14, and is washed by the impact force. . When the washing process ends, the water is drained and the process proceeds to the dehydration process. When the laundry becomes completely uniform in the drum 14 at the time of dehydration, vibration and noise can be reduced. However, the laundry becomes unbalanced in the drum 14 due to a difference in cloth quality or a difference in thickness. It is inevitable. Along with this, vibration and noise are generated, but in this embodiment, the vibration proof damper 13 suppresses the vibration from being transmitted from the water tank 11 to the floor surface which is the installation surface of the drum type washing machine.

  At this time, in this type of drum-type washing machine, the noise generated when a relatively large vibration is generated has many causes such as fluid noise such as wind and vibration that shakes each component. Among them, the most problematic is low-frequency vibration sound generated in the vicinity of 100 Hz to 200 Hz. The oil damper mechanism 24 used for the vibration damping damper 13 has an effect of accurately suppressing an increase in vibration at the time of resonance due to a viscous resistance loss when the piston 26 relatively moves in the oil 22 in the cylinder 21. However, contrary to such an excellent effect, the present inventors have made it clear that the low frequency vibration sound is generated by itself. The reason is considered as follows.

  In the oil damper mechanism 24, oil 22 and high-pressure gas 23 are enclosed in a cylinder 21. In order to prevent the high-pressure differential fluid from leaking, the degree of fitting between the inner seal lip 41 and the outer seal lip 42 of the oil seal member 35 and the outer peripheral surface of the piston rod 27 is set tightly. In this state, when the drum 14 enters a dehydrating operation state where the drum 14 rotates at high speed, the damper mounting portion of the water tank 11 vibrates up and down. The vibration member 13 is supported by the vibration damping member 13 in a vibration-proof state by the spring member 25 of the vibration-proof damper 13 extending and contracting and the cylinder 21 and the piston rod 27 of the oil damper mechanism 24 moving relatively up and down. The transmission of the vibration of the drum 14 to the surface is reduced. At this time, when the top / bottom dead center of the piston rod 27 is reached, the contact state between the inner seal lip 41 and the outer seal lip 42 of the oil seal member 35 and the outer peripheral surface of the piston rod 27 is dynamic friction → static friction → dynamic friction state. And change.

  Here, when there is no seal grease 43 inside the oil seal member 35 and grease 44 outside the outer seal lip 42, the change in the friction coefficient between the dynamic friction and the static friction state becomes very large. For this reason, at the time of this change, the water tank 11 moves so as to be stopped momentarily when viewed microscopically. Accordingly, an acceleration change occurs, and a force represented by the equation P = m · A (P: force, m: mass, A: acceleration) is generated. It was clarified that this force is a force that shakes the water tank 11 and generates low-frequency noise.

  Incidentally, in the above frequency band, it was observed that noise in the same frequency band was also generated in a dummy test that gave an impact force to the drum 14, and the natural frequency of the mechanism part including the drum 14 and the periphery of the bearing was the cause. is there. In the oil damper mechanism 24, as described above, the inner seal lip 41 and the outer seal lip 42 in the oil seal member 35 are tightly fitted to the outer peripheral surface of the piston rod 27, and the inner seal lip 41 has an internal pressure. This has the effect of pressing the force F against the piston rod 27, causing the noise to occur.

Therefore, in the present embodiment, the grease 44 is injected particularly in the extension cylinder portion 38 in the cylinder 21 and in the vicinity of the outside of the outer seal lip 42. Thereby, in particular, the dynamic friction coefficient and the static friction coefficient of the outer seal lip 42 can be brought close to each other, and low frequency noise can be reduced. At this time, by using a grease containing molybdenum for the grease 44, the molybdenum particles contained in the grease 44 are formed on the polishing uneven surface (polishing groove of about several μm) on the outer peripheral surface of the piston rod 27. It is considered that the friction coefficient of the dynamic friction and the static friction is made small up to the surface of the inner seal lip 41 because the inner seal lip 41 and the outer seal lip 42 cannot be wiped off. The lubricant used is molybdenum disulfide (MnO ₂ ), which adheres to the metal surface in layers. Molybdenum disulfide acts as an extreme pressure solid lubricant. The crystals are hexagonal layered.

  FIG. 5 shows measured values of dehydration noise. In FIG. 5, the horizontal axis indicates the noise frequency in 1/3 octave band, and the vertical axis indicates the noise level. The dehydration rotation speed was 900 rpm, and 300 g of unbalance weight corresponding to the unbalance of the laundry in the drum 14 was attached. In FIG. 5, the present invention is an example according to this embodiment, and in the comparative example, a small amount of seal grease 43 inside the oil seal member 35 is injected, but in the vicinity of the outside of the outer seal lip 42. The grease 44 is an example that is not injected. As is apparent from FIG. 5, in the case of the present invention, it can be seen that noise in the band from 100 Hz to around 250 Hz is reduced as compared with the comparative example. Auditoryly, the user feels that he is quiet and quiet as the low frequency sound is reduced. In FIG. 5, “OA” at the right end of the horizontal axis is an abbreviation of “overall” and indicates that the whole is integrated.

  FIG. 6 shows the result of confirming the function of the washing machine by changing the consistency of the grease 44. As a result, ◎: very good, ◯: good, △: not good, ×: bad. The grease consistency is based on JIS K2220 classification. For grease dripping, grease 44 was applied near the outside of the outer seal lip 42, and it was confirmed whether or not the grease 44 dripped on the floor surface. In the drying process, when the temperature in the housing 1 increases and the consistency increases (softens), it suddenly deteriorates. Even grease with a grease classification equivalent to No. 2 (grease consistency of 265 to 295) is not practically suitable for long-term use. For noise reduction, grease equivalent to No. 3 is suitable, and grease of No. 2 or less increases the consistency and reduces the oil film thickness against the seal lip, reducing the noise reduction effect. This grease is considered to have increased noise because the consistency of the grease became smaller (harder) and the movement of the seal lip and piston rod deteriorated. The vibration floor transmission force measures the force transmitted to the floor via the vibration damper 13 and exhibits a characteristic that is inversely proportional to the consistency of the grease. In the case of a small consistency (No. 4), the floor transmission force becomes large at low temperatures.

From the above results, No. 3 grease (with a grease consistency of 220 to 250) exhibits the effect of the present invention most. Considering the variation in the grease consistency, the grease 44 having a grease consistency of 200 to 260 is preferable.
According to the above-described embodiment, in the case where the oil damper mechanism 24 is used for the vibration damping damper 13, the oil damper mechanism 24 has an inside of the extension cylinder portion 38 on the opening side of the cylinder 21 and the oil seal member 35. By providing the grease 44 near the outside of the outer seal lip 42, the frictional resistance when the outer seal lip 42 of the oil seal member 35 and the piston rod 27 are moved in sliding contact with each other is reduced. Since the change in the friction coefficient of the dynamic friction becomes small, the generation of noise can be reduced as much as possible. In this case, the extension cylinder part 38 has the effect | action which covers the grease 44 provided in the inside from the outside, and prevents the grease 44 from splashing radially outward.

  By using molybdenum containing grease 44, the lubricity between the outer seal lip 42 and the outer peripheral surface of the piston rod 27 can be further improved, and noise can be further reduced. In addition, by using a grease having a grease consistency of 200 to 260 as the grease 44, it is possible to obtain an operational effect excellent in noise reduction, grease dripping, and vibration floor transmission force. As the grease 44, it is not always necessary to use molybdenum-containing grease, and ordinary grease containing lithium soap can also be used.

FIGS. 7 to 9 show a second embodiment of the present invention. This second embodiment is different from the first embodiment described above in the following points.
That is, an annular grease holding member 51 is disposed inside the extension cylinder portion 38 on the opening side of the cylinder 21. The grease holding member 51 has an end ring shape (cut along a cutting surface 51a) as shown in FIG. 9 so that it can be attached to the oil damper mechanism 24 later. The grease holding member 51 is preferably made of felt having a high oil absorption property. When attaching the grease holding member 51, the grease holding member 51 is opened at the cut surface 51 a, fitted to the piston rod 27 from the outer peripheral portion, and inserted into the extension cylinder portion 38.

  The inner shape of the opening 52 formed at the bottom of the spring receiving member 45 provided outside the cylinder 21 is slightly smaller than the outer shape of the grease holding member 51, and the peripheral portion of the opening 52 Is used as a retaining portion 53 for preventing the grease holding member 51 from falling. Therefore, the retaining portion 53 is provided integrally with the spring receiving member 45. Since the opening 52 needs to be able to insert the convex portion 48 of the piston rod 27 because of the assembly, as shown in FIG. We are trying to secure a fee.

  The second embodiment described above has the following advantages in particular. That is, by disposing the grease holding member 51 in the extension cylinder part 38, it is possible to prevent the grease 44 injected into the extension cylinder part 38 from going out and to keep the effect of the grease 44 stable for a long period of time. It becomes possible. Further, since the grease holding member 51 has an end ring shape, it can be assembled to the oil damper mechanism 24 later.

Since the spring retaining member 45 mounted on the outside of the cylinder 21 is integrally provided with a drop-preventing portion 53 for preventing the grease holding member 51 from dropping, it is not necessary to provide a separate separate member for preventing the drop. .
FIG. 10 shows a third embodiment of the present invention. This third embodiment is different from the above-described second embodiment in the following points.

That is, the grease retaining member 55 disposed in the extension cylinder portion 38 is formed with a grease reservoir portion 56 for accumulating the grease 44 on the upper side. In this case, as the grease holding member 55, synthetic resin such as POM or rubber such as NBR can be used.
FIG. 11 shows a fourth embodiment of the present invention. This fourth embodiment is different from the first to third embodiments described above in the following points.

  That is, the oil seal member 58 disposed in the cylinder 21 includes two members, a first seal member 59 having an upper inner seal lip 59a and a second seal member 60 having a lower outer seal lip 60a. Consists of. A grease reservoir 61 is formed between the first seal member 59 and the second seal member 60, and grease 62 containing molybdenum is injected into the grease reservoir 61. The grease 62 is configured to serve both as a seal grease for oil seal and a grease for noise reduction, and has a larger capacity than the seal grease 43 in the first to third embodiments.

Also in the fourth embodiment having such a configuration, a noise reduction effect can be obtained basically as in the first embodiment. Also in this case, the extended cylindrical portion 38 of the cylinder 21 can be expected to prevent the grease 62 from scattering outward.
The present invention is not limited to the above embodiments, and can be modified or expanded as follows.

  The present invention is not limited to a drum-type washing machine, and can also be applied to a washing machine in which a vertical rotating tub serving as a washing tub and a dewatering tub is rotatably disposed in a water tub.

The fracture | rupture side view of the vibration isolator which shows the 1st Embodiment of this invention Longitudinal side view of main part External perspective view of drum-type washing machine Longitudinal side view Figure showing noise measurement results The figure which shows the result of changing the grease consistency and confirming the function as a washing machine Longitudinal side view of main part showing second embodiment of the present invention Cross-sectional bottom view with main part viewed from below Perspective view of grease holding member Longitudinal side view of main part showing third embodiment of the present invention Longitudinal side view of main part showing a fourth embodiment of the present invention

Explanation of symbols

In the drawings, 1 is a housing, 11 is a water tank, 13 is an anti-vibration damper, 14 is a drum (washing tub and dewatering tank), 21 is a cylinder, 22 is oil, 23 is high-pressure gas, 24 is an oil damper mechanism, and 25 is Spring member, 26 piston, 27 piston rod, 33 slider, 34 metal, 35 oil seal member, 38 extended cylinder, 41 inner seal lip, 42 outer seal lip, 43 seal grease, 44 Is grease (molybdenum containing grease), 45 is a spring receiving member, 51 is a grease holding member, 53 is a stopper, 55 is a grease holding member, 56 is a grease reservoir, 58 is an oil seal member, and 59 is a first seal. Reference numeral 60 denotes a second seal member, 61 denotes a grease reservoir, and 62 denotes grease (molybdenum containing grease).

Claims (7)

A water tub disposed in the housing; a washing tub disposed in the water tub; and a vibration proof damper for supporting the water tub in a vibration proof state, wherein the vibration proof damper is disposed in the cylinder. In the washing machine configured to include an oil damper mechanism in which oil is sealed in and a piston is configured to slide relatively in the cylinder,
The oil damper mechanism includes an oil seal member that is positioned inside the cylinder and on the opening side of the cylinder and that is in sliding contact with an outer peripheral surface of a piston rod that moves together with the piston. An extension tube portion projecting toward the outer side in the axial direction than the oil seal member is integrally formed at the end portion on the side,
A washing machine characterized in that grease is provided inside the extension cylinder portion and in the vicinity of the outside in the axial direction of the oil seal member.   The washing machine according to claim 1, wherein a grease holding member is disposed inside the extension cylinder portion.   The washing machine according to claim 2, wherein the grease holding member is provided with a grease reservoir for storing the grease.   The anti-vibration damper includes a coiled spring member provided on the outer coaxial line of the oil damper mechanism, and a spring receiver that receives one end portion of the spring member outside the cylinder of the oil damper mechanism. The washing machine according to claim 2 or 3, further comprising a member, wherein the spring receiving member is integrally provided with an anti-drop portion for preventing the grease holding member from dropping. A water tub disposed in the housing; a washing tub disposed in the water tub; and a vibration proof damper for supporting the water tub in a vibration proof state, wherein the vibration proof damper is disposed in the cylinder. In the washing machine configured to include an oil damper mechanism in which oil is sealed in and a piston is configured to slide relatively in the cylinder,
The oil damper mechanism includes an oil seal member that is positioned inside the cylinder and on the opening side of the cylinder and that is in sliding contact with an outer peripheral surface of a piston rod that moves together with the piston. An extension tube portion projecting toward the outer side in the axial direction than the oil seal member is integrally formed at the end portion on the side,
A washing machine, wherein a grease containing molybdenum is provided between the oil seal member and the outer peripheral surface of the piston rod.   6. The washing machine according to claim 5, wherein the oil seal member is composed of two members, and a grease reservoir for collecting the grease is provided between the two members. The washing machine according to any one of claims 1 to 6, wherein a grease having a consistency of 200 to 260 is used as the grease.

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