JP2008245717A - Drum washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit a stable damper effect by a damping force for a long time by suppressing the leakage of a lubricant supplied to a friction sliding surface in a suspension having a friction damper function. <P>SOLUTION: For vibration damping support of a vibrating water tub 55, a suspension 57, having a damping action of friction caused by reciprocation of a shaft 64 relative to a friction member 72, is configured to be provided with upper and lower case members 69 and 70 for pressing and holding the outer peripheral side of the friction member 72, to have an annular rib 71 extending upward in a part of the lower case member 70 through which the shaft 64 is inserted, and to be brought into contact with the shaft 64, so that downward leakage of the lubricant applied to the friction sliding surface is prevented by the rib 71. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drum type washing machine provided with a suspension for vibration-proofing a water tank containing a drum.

  2. Description of the Related Art Conventionally, a drum-type washing machine has a structure in which a drum is provided in a water tank for storing washing water and is rotatable about a horizontal axis (including an inclined axis). The water tank that accommodates such a drum is configured to be supported by a plurality of suspensions so that vibrations generated during washing, dehydration, and drying processes are not directly transmitted to the outer box (for example, see Patent Document 1).

  As the background art of this type of suspension, as is apparent from the description in the background art section of Patent Document 1, generally an oil damper configuration and a friction damper configuration are conceivable. In the former oil damper configuration, a drum is used. It has a proportional characteristic in which the damping force increases as the rotational frequency increases (see FIGS. 13 and 14 of Patent Document 1). However, in a drum-type washing machine, the vibration amplitude tends to increase in a low drum rotation frequency region where the resonance point of the water tub exists, and therefore, an oil damper configuration with reverse characteristics is not appropriate. On the other hand, the damping force by the latter friction damper configuration is said to be suitable for the suspension of the drum type washing machine because it does not depend on the drum rotation frequency.

As a specific example, for example, the fourth embodiment disclosed in paragraph [0036] and FIG. 8 will be described from the embodiment described in Patent Document 1. This friction damper configuration is shown in FIG. As shown in the enlarged view, the bottomed cylindrical holding members 40, 40 for disposing and fixing the friction member 30 in a fixed state in the cylinder 9 are arranged between the upper and lower bearings 13, 13. According to this configuration, a large damping force can be obtained by reciprocating the shaft 14 relative to the stationary friction member 30, and the gaps X and Y can be filled with a lubricant so that the friction member 30 can be filled. It is effective in suppressing the wear of steel.
Japanese Patent Laying-Open No. 2006-190 (see paragraphs [0036] to [0039] and FIG. 8)

Thus, according to the above configuration, it is suitable for the suspension 7 used in the drum type washing machine, which is suitable for suppressing the vibration amplitude to be small and effective for preventing the friction member 30 from being worn with the shaft 14. Is.
Therefore, in order to stably exhibit an effective damper effect and to put it to practical use, the friction damper configuration is capable of maintaining a damping force based on the frictional force by the friction member 30 in a stable state for a long period. One important factor is the stability of the lubricant.

  By the way, as shown in an enlarged view in FIG. 6, the diameter of the portion through which the shaft 14 is inserted at the bottom of the bearings 13 and 13 and the holding members 30 and 30 is a minute gap S (for example, about 0.25 mm in the radial direction). have. This is to prevent other members from causing unnecessary friction so that the friction member 30 exhibits the desired frictional force. However, even when the lubricant between the shaft 14 and the friction member 30 and the lubricant filled in the gaps X and Y are used, they tend to gradually descend while repeatedly performing the relative vertical movement. I cannot deny. Accordingly, the lubricant that leaks to the lower side through the lower gap S in particular is wasted, and the amount decreases accordingly. As a result, it has been found that the desired frictional force cannot be maintained stably for a long period of time, causing a decrease in damping force and causing problems such as increased vibration noise such as frictional noise.

  In order to solve the above-described problems, an object of the present invention is to provide a drum type washing machine including a suspension that can suppress the leakage of a lubricant and can stably exhibit a friction damper effect for a long period of time.

  In order to achieve the above object, the drum type washing machine of the present invention is a drum type washing machine provided with a suspension for vibration-proofing and supporting a water tank containing a drum therein, wherein the suspension includes a cylindrical cylinder, The upper and lower bearings are fixed to the inside of the cylinder so as to be spaced apart from each other, a shaft that is inserted and supported so as to be capable of linear reciprocation relative to the bearings, and fitted between the bearings on the outer periphery of the shaft. And a cylindrical friction member made of an elastic body that generates a frictional force by reciprocating relative to the shaft, and a bottomed cylindrical shape disposed opposite to the upper and lower portions between the bearings. An upper and lower case member that presses and holds the outer peripheral side of the friction member at the shape part, and an annular rib extending upward is formed in the center of the bottom part through which the shaft of the lower case member is inserted, The tip of the rib is Characterized by being configured to contact the outer periphery of the serial shaft (invention of claim 1).

  According to the above means, the upper case member disposed oppositely presses and holds the friction member made of an elastic body in an immobile state to effectively exert the original friction force, and in particular, lubrication by the lower case member. A drum-type washing machine that can suppress the external leakage of the agent, can exhibit a stable damper effect for a long period of time, and can practically use a suspension composed of a friction damper that exhibits an effective damping action even in a low rotational frequency range it can.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, a description will be given based on a side view showing a schematic overall configuration of the drum type washing machine shown in FIG. 4. A casing 51 includes a rectangular cylindrical outer box 52 and an operation panel (not shown) on the upper surface. The top cover 53 and the base plate 54 attached to the lower surface of the outer box 52 are generally configured.

  A cylindrical water tank 55 that can store water is disposed in the outer box 52, and a drum 56 that can rotate around a horizontal axis by a horizontal axis is accommodated in the water tank 55. A plurality (for example, two) of suspensions 57 are provided between the outer bottom side of the water tank 55 and the base plate 54 (details will be described later), whereby the water tank 55 is connected to the housing. The base plate 54, which is the lower part of the body 51, is supported by vibration isolation.

  As is well known, the drum 56 has a cylindrical shape as a whole in which a large number of through holes (not shown) are formed in the peripheral wall. The drum 56 has a well-known outer rotor type provided on the back side of the water tank 55. It is rotationally driven by a drum drive motor 58 comprising a DC brushless motor. By driving the motor 58, a washing operation or a dehydrating operation is performed on the laundry (not shown) accommodated in the drum 56. The top cover 53 is provided with a lid 53a that can be opened and closed, and the laundry can be taken in and out of the drum 56 when the lid 53a is opened.

  Here, one configuration of the suspension 57 that supports the water tank 55 in a vibration-proof manner will be described with reference to FIGS. 1 and 2 in addition to FIG. 2 is a cross-sectional view showing the overall configuration of the suspension 57 alone, and FIG. 1 is an enlarged cross-sectional view showing the main part of the suspension 57. A connecting member 63 to be connected and fixed to the water tank 55 side is provided at the upper end portion of the suspension 57, and is fixed to the upper end portion of a cylindrical cylinder 59, which will be described in detail later, by caulking or the like. As shown in FIG. 4, the connecting member 63 is fastened and fixed to the mounting plate 60 on the water tank 55 side by means of nuts 62 via elastic seat plates 61 a and 61 b such as rubber. It is configured to vibrate integrally.

  On the other hand, a shaft 64, which will be described in detail later, is connected to the lower end portion of the suspension 57, and a connecting portion 64a to be connected and fixed to the base plate 54 side is integrally formed at the lower end portion of the shaft 64. ing. The connecting portion 64a has the same shape as the connecting member 63 at the upper end, and is fastened and fixed to the mounting plate 65 on the base plate 54 side by the nut 62 via the same elastic seat plates 61a and 61b as described above. Yes. Accordingly, the water tank 55 is supported on the base plate 54 by the suspension 57 having the cylinder 59 and the shaft 64 connected to each other.

The specific configuration of the suspension 57 will be described with reference to FIGS. 1 and 2 in particular. The lower part of the cylinder 59 and the upper part of the shaft 64 are connected as follows.
First, in the lower region of the cylinder 59, upper bearings 66, 67 made of sintered oil-impregnated metal are vertically spaced apart, for example, press-fitted and fixed. Among them, the insertion position of the upper bearing 66 into the cylinder 59 is fixed by being held by the annular protrusion 68 projecting inward so as not to move.

  And the bottomed cylindrical upper and lower case members 69, 70 are disposed oppositely between the upper and lower bearings 66, 67, and the end surfaces of the cylindrical portions 69 a, 70 a are butted together (in FIG. And is fixedly fitted in the cylinder 59. In the center of the bottom portions 69b and 70b, there are through holes 69c and 70c through which the shaft 64 can be inserted. The upper and lower case members 69 and 70 have similar shapes, but an annular rib 71 is provided to project upward around a portion where the shaft 64 of the bottom 70b of the lower case member 70 is inserted, that is, around the through hole 70c. Are different.

  Accordingly, the rib 71 will be described in detail based on the enlarged view of FIG. FIG. 3 is an enlarged view of the portion indicated by the symbol B in FIG. 1, and the tip end portion of the rib 71 is in contact with the shaft 64. Each of the case members 69 and 70 is made of a resin having a relatively high rigidity, but the distal end side of the extended tapered rib 71 has appropriate elasticity, and increases the degree of contact with the outer peripheral surface of the shaft 64 to the periphery. It is in good contact. In the present embodiment, the shape has a rake face 71a with respect to the substantially vertical contact surface of the shaft 64, and the rake face 71a has a positive rake angle α as an angle with respect to the vertical face.

In addition, the shape of the inner peripheral surface of the cylindrical portions 69a and 70a of the case members 69 and 70 will be described together with the configuration of the friction member 72 below.
That is, referring back to FIG. 1, a friction member 72 slidable with the outer peripheral surface of the shaft 64 is accommodated in the cylindrical portions 69 a and 70 a of the case members 69 and 70. The friction member 72 is made of, for example, an elastic body such as synthetic rubber, and is formed in a cylindrical shape as a whole. The outer peripheral corners on both sides in the axial direction are formed in a cylindrical shape having inclined surfaces 72a as cut. . Thus, the inclined surfaces 69d and 70d are formed at positions facing the inner peripheral surfaces of the cylindrical portions 69a and 70a of the case members 69 and 70 in order to follow the cylindrical outer peripheral surface shape having the inclined surface 72a. The structure is formed.

  Further, the upper and lower opening end portions through which the shaft 64 at the center of the friction member 72 is inserted form a radially enlarged opening 72b that expands outward. Although not shown in the drawing, the inner diameter surface connected to the enlarged opening 72b is subjected to, for example, a textured process or a fine groove shape, and is configured to be in sliding contact with the shaft 64 via a lubricant described later. Here, the assembled form of the friction member 72 having the above-described shape will be described. In a free state in which the friction member 72 is accommodated in the case members 69 and 70 at the time of assembling, the abutting portions A of the end surfaces of the cylindrical portions 69a and 70a. In this state, a slight gap is generated, and this is finally accommodated and held in a butted state so that the friction member 72 has a cylindrical portion including the inclined surfaces 69d and 70d of the case members 69 and 70. The inner peripheral surfaces 69a and 70a are held in a fixed state (immobilized state) in an immobile state.

As described above, annular space portions 73 and 74 are formed at the upper and lower ends of the friction member 72 in the assembled state between the inside of the upper and lower case members 69 and 70 and the outer peripheral surface of the shaft 64, respectively. Is done. The space portions 73 and 74 function as an oil sump portion for a lubricant, which will be described in detail in the description of the operation. In particular, since the rib 71 is provided at the tip of the lower case member 69, it can be said that the lower case member 69 alone has a part of the function of the oil reservoir. In this embodiment, as the lubricant, for example, relatively viscous grease (not shown) containing molybdenum (MnO ₂ ) is used, and the space portions 73 and 74 have a predetermined amount of lubricant, that is, The grease is supplied and stored and supplied to the sliding surfaces of the bearings 66 and 67 and the friction member 72 and the shaft 64.

  A nut 76 is fastened to the upper end of the shaft 64 via a washer 75 having a large diameter to prevent the shaft 64 from coming off. On the other hand, the lower end portion of the cylinder 59 is pressure-formed by a roller (not shown) from the side to reduce the diameter of the open end to ensure the fixing of each of the internal members. In actual assembly, the bearings 66 and 67, the case members 69 and 70, the friction members 72 and the like are temporarily fixed to the shaft 64 and inserted into the cylinder 59, and then fixed and the completed assembly is completed. This is because the state is obtained.

  A small hole 59 a is formed in the cylinder 59 in the vicinity of the upper portion of the upper bearing 66. This makes it possible to inject and inject a lubricant (grease) by the lubricant injecting tool 80 indicated by a two-dot chain line in FIG. 1. It covers the sliding surface, which is the outer peripheral surface of. However, in this embodiment, a similar small hole 59b is provided above the small hole 59a.

  This is because small cylinders 59a and 59b are located at equal symmetrical positions from both ends so that the cylinder 59 at the beginning of assembly does not have a vertical direction in which the cylinder 59 is simply cylindrical, that is, either end may be positioned at the lower end. Are formed so that at least one small hole 59a or 59b is always located in the vicinity of the upper portion of the upper bearing 66. Each small hole 59a, 59b acts as an air escape when the shaft 64 is inserted together with each member into the cylinder 59 as described above, and the inside of the cylinder 59 becomes a sealed space and it is difficult to incorporate it with compressed air pressure. It is also effective to avoid.

  Thus, the cylinder-side spring seat 77 is fitted and fixed around the outer periphery of the lower end of the cylinder 59 on which the members such as the friction member 72 are mounted. A shaft-side spring seat 78 (see FIG. 4) is provided at the lower portion of the shaft 64 so as to face and separate from this. A coil spring 79 made of a compression coil spring is mounted on the outer periphery of the cylinder 59 and the shaft 64 so as to be stretchable between the spring receiving seats 77 and 78. Accordingly, the suspension 57 is assembled in a connected state between the water tank 55 and the base plate 54 on the housing 51 side, and the water tank 55 is supported in the housing 51 by the two suspensions 57.

  The operation of the drum type washing machine having the above-described configuration, in particular, the function of the suspension 57 will be described below. When operations such as washing and dehydration are started, the water tank 55 (see FIG. 4) vibrates mainly in the vertical direction as the drum 56 containing the laundry is driven to rotate. This vibration amplitude increases in the vicinity of the resonance point in the low rotational frequency region along with the displacement of the laundry (not shown). In response to this vertical vibration, the cylinder 59 integrally connected to the water tank 55 also vibrates in the vertical direction, which is the axial direction, with the expansion and contraction of the coil spring 79. On the other hand, the shaft 64 connected to the base plate 54 side reciprocates up and down relatively in the cylinder 59 that vibrates up and down. Thereby, a damping force is generated by the frictional action between the shaft 64 and the friction member 72.

The action of the suspension 57 at this time will be specifically described with reference to FIG.
That is, when the shaft 64 reciprocates relative to the cylinder 59, the inner peripheral surface of the friction member 72 slides with the outer peripheral surface of the shaft 64 that reciprocates, and the shaft 64 moves from the friction member 72 to the Coulomb friction force. As a result, a damping force is generated. At this time, the friction member 72 receives a force that is dragged downward in the axial direction due to friction with the shaft 64. However, the friction member 72 is prevented from moving upward and downward by the contact of the inclined surfaces 69d and 70d of the case members 69 and 70 arranged opposite to the inclined surfaces 72a of the outer peripheral corners of the friction member 72. Is done.

  However, as the force dragged in the upward and downward directions of the friction member 72 increases, the degree of contact received by the inclined surface 72a on the outer peripheral side of the friction member 72 increases, and in addition, the outer peripheral side of the friction member 72 is also cylindrical. The friction members 72 are bent and deformed so as to squeeze in the radial direction because they are pressed and held by the shape portions 69a and 70a. As a result, the shaft 64 receives a stronger Coulomb friction force from the friction member 72, and a damping force is suddenly generated. Therefore, such a damping action is repeatedly generated by the friction member 72 with the relative reciprocation of the shaft 64, thereby generating a large damping force effective for suppressing the vibration amplitude of the water tank 55.

  The frictional force generated between the friction member 72 and the shaft 64, which is the basis of the damping force, is stabilized by grease (not shown) as a lubricant applied between the two and the friction member 72. It works effectively to prevent excessive wear. However, the grease exerts a lubricating action over a long period of time by filling and supplying the spaces 73 and 74 formed in the upper and lower portions of the friction member 72. However, as already described in the background section, the conventional shaft 64 is supported so as to be movable up and down, the lower bearings 66 and 67, and the adjacent upper and lower case members 69 and 70 are all connected to the outer peripheral surface of the shaft 64. Since there is a minute gap S (see FIGS. 1 and 3), grease may leak from the gap S. In particular, it is easy to leak from the lower case member 70 and the lower bearing 67 side located in the lower part, and of course, once leaked, it is substantially impossible to recover the grease.

  For this reason, the space portions 73 and 74 that function as oil reservoirs (grease reservoirs) have a limit in long-term use, but eventually the damping force becomes unstable due to insufficient grease, and the friction member 72 is prematurely worn and uncomfortable frictional noises, etc. Expected to occur. However, in the present embodiment, as shown in FIG. 3 in particular, the lower case member 70 is provided with ribs 71 that come into contact with the outer periphery of the shaft 64, so that the grease leaked downward from between the upper friction member 72 and the shaft 64. Is collected by the rib 71 and stored in the space 74. The grease stored in the space 74 is reapplied to the shaft 64 side by the reciprocating motion of the shaft 64, and is effectively used for lubrication while sliding with the friction member 72.

  Moreover, more specifically, the upper and lower case members 69 and 70 are formed of a relatively rigid material such as a resin material that presses and holds the friction member 72 in an immobile state, but protrudes in a tapered shape. The rib 71 is elastic and keeps good contact with the shaft 64. In addition, since the rake face 71a having a predetermined rake angle α is formed, the grease leaked along the outer peripheral face of the shaft 64 can be effectively collected and stored.

  Still, when the amount of grease decreases due to long-term use, or when the grease supplied at the time of manufacture does not function effectively (for example, variation in amount or application location), as shown in FIG. A nozzle portion of a lubricant injection tool 80 as shown in the figure can be inserted through at least a small hole 59a formed in the vicinity of the upper portion of the upper bearing 66 of the cylinder 59, so that grease can be replenished to the upper surface portion of the upper bearing 66. It is useful as the only means for supplying grease to the inside covered with the cylinder 59.

As described above, according to this embodiment, the following operational effects are obtained.
The lower case members 69 and 70, which are opposed to each other between the bearings 66 and 67 fixed to the upper and lower portions in the cylinder 59, press and hold the outer peripheral side of the friction member 72 made of an elastic body so as to be kept stationary. In addition to effectively exerting the original frictional force, it is possible to suppress the external leakage of the grease as the lubricant by the lower case member 70 in particular, and to exhibit a long-term stable damper effect, and also effective in a low rotational frequency range. A suspension 57 having a friction damper configuration that exhibits a sufficient damping action can be provided.

  Further, an annular rib 71 extending upward is formed at the center of the bottom 69b through which the shaft 64 is inserted in at least the lower case member 70 of the upper and lower case members 69 and 70 to press and hold the friction member 72 in an immobile state. In addition, since the tip portion is in contact with the shaft 64, it is possible to receive the grease that has gradually dropped due to the reciprocal sliding between the upper friction member 72 and the shaft 64, and the grease leaks to the outside at an early stage. This can be prevented and a stable lubricating action can be expected over a long period of time.

  Moreover, as the specific shape of the rib 71, the rake face 71a having a predetermined rake angle α with respect to the contact with the outer periphery of the shaft 64 is formed. Since it can be recovered and stored in the space 74, a more stable lubricating action can be obtained for a longer period of time, and the vibration noise caused by the concerned friction noise can be effectively reduced.

  In addition, it is predicted that grease will be replenished for some reason during manufacture or for long-term use. However, it is not possible to supply to the members such as the bearings 66 and 67 and the friction member 72 incorporated in the cylinder 59 from the outside. It is impossible unless it is decomposed rather than difficult. However, in this embodiment, since the small hole 59a is provided at least in the vicinity of the upper portion of the upper bearing 66, the nozzle portion of the lubricant injection tool 80 can be introduced into the small hole 59a and can be injected and compensated on the upper surface of the upper bearing 66. As a result, an effective lubricating action can be supplemented to the friction sliding surface such as the lower friction member 72 after a slight operating time.

On the other hand, since the inside of the cylinder 59 is not sealed by providing the small hole 59a, the air pressure due to the compression when the members are assembled and inserted into the cylinder 59 or when the shaft 64 reciprocates. It can be executed smoothly without being affected by.
In this embodiment, the lower case member 70 is provided with a so-called lubricant leakage prevention means, which is a part that is not common to the upper case member 69. However, the upper case member 69 also has a configuration of the lower case member 70. May be adopted. This sharing of components is advantageous in terms of reducing the number of components, improving workability, and preventing assembly errors.

<Second Embodiment>
FIG. 5 is a view corresponding to FIG. 1 showing the second embodiment of the present invention with respect to the above-described embodiment. In FIG. I will explain.
In this embodiment, the suspension 81 is provided with a lubricant leakage prevention means (corresponding to the lower case member 70) below the friction member 72. In this embodiment, the leakage prevention means is provided for the lower bearing 67. It differs in that it has been applied downward. Therefore, the lower case member 82 in this embodiment has the same shape as the upper case member 69.

  Specifically, as shown in the figure, an annular sealing member 83 is fitted and secured between the lower end of the cylinder 59 below the lower bearing 67 as shown in the figure. The sealing member 83 has a configuration in which an outer periphery is covered with a cylindrical metal ring 84, and a flexible cylindrical leak prevention body 85 made of resin or rubber is fitted and fixed therein. . The leak preventing body 85 is integrally formed with a lip 85a extending obliquely upward from the cylindrical lower end portion toward the center.

  Thus, when the sealing member 83 having the above-described configuration is incorporated below the lower bearing 67, the lip 85a of the flexible leakage preventing body 85 has an inner diameter shape that elastically contacts the shaft 64. . A space 86 is formed between the sealing member 83 and the outer peripheral surface of the shaft 64.

  According to the above configuration, the grease leaked from the minute gap S of the lower bearing 67 due to the relative reciprocation of the shaft 64 is effectively recovered by the lip 85 a elastically contacting the shaft 64 and stored in the space portion 86. And leakage to the outside can be avoided. Therefore, not only the leakage of grease but also the descent phenomenon of grease along the shaft 64 is stopped, and a long-term stable lubricating action can be expected. In the suspension 81, the bearings 66 and 67 are made of sintered oil-impregnated metal having excellent durability. However, it is of course important to support the shaft 64 with grease. However, in the present embodiment, the sealing member 83 disposed below the lower bearing 67 is excellent in that the grease is retained at least with respect to the lower bearing 67 and the lubrication action can be maintained stably for a long period of time. It is advantageous to increase the durability of the.

  The present invention is not limited to the embodiments described above and shown in the drawings. For example, the configurations of the embodiments can be appropriately combined, and are not limited to a washing machine having a drum around the horizontal axis. For example, a washing machine having a vertical drum around the vertical axis may be used, and various modifications can be made without departing from the scope of the present invention.

The expanded sectional view of the important section of the suspension which shows the 1st example of the present invention. Sectional view showing the overall structure of the suspension FIG. 1 is an enlarged view of a portion indicated by a symbol B in FIG. Side view of the main part of a drum-type washing machine broken away FIG. 1 equivalent view showing a second embodiment of the present invention. 1 equivalent diagram showing a conventional example

Explanation of symbols

  In the drawings, 51 is a housing, 54 is a base plate, 55 is a water tank, 56 is a drum, 57 and 81 are suspensions, 59 is a cylinder, 59a and 59b are small holes, 64 is a shaft, 66 is an upper bearing, and 67 is a lower bearing. 69 is an upper case, 70 is a lower case, 71 is a rib, 71a is a rake face, 72 is a friction member, 80 is a lubricant injection tool, 83 is a sealing member, 85 is a leak preventer, and 85a is a lip. .

Claims (4)

In a drum-type washing machine equipped with a suspension for vibration-proofing a water tank containing a drum inside,
The suspension is
A cylindrical cylinder;
Upper and lower bearings fixed to the upper and lower parts inside the cylinder,
A shaft that is inserted and supported so as to be capable of linear reciprocation relative to each of the bearings;
A cylindrical friction member made of an elastic body that is fitted between the bearings and is fitted to the outer periphery of the shaft and generates a frictional force by relative reciprocation between the shafts;
A bottomed cylindrical shape arranged opposite to the upper and lower parts between the bearings, and pressing and holding the outer peripheral side of the friction member with the cylindrical part, a lower case member,
Comprising
A drum-type laundry having a structure in which an annular rib extending upward is formed in the center of the bottom portion of the lower case member through which the shaft is inserted, and a tip portion of the rib is in contact with the outer periphery of the shaft. Machine.   2. The drum type washing machine according to claim 1, wherein a small hole is provided in the cylinder near the upper portion of the upper bearing. 2. The drum type washing machine according to claim 1, wherein the rib of the lower case member has a rake angle with respect to contact with the shaft. In a drum-type washing machine equipped with a suspension for vibration-proofing a water tank containing a drum inside,
The suspension is
A cylindrical cylinder;
Upper and lower bearings fixed to the upper and lower parts inside the cylinder,
A shaft that is inserted and supported so as to be capable of linear reciprocation relative to each of the bearings;
A cylindrical friction member made of an elastic body that is fitted between the bearings and is fitted to the outer periphery of the shaft and generates a frictional force by relative reciprocation between the shafts;
A bottomed cylindrical shape arranged opposite to the upper and lower parts between the bearings, and pressing and holding the outer peripheral side of the friction member with the cylindrical part, a lower case member,
A flexible sealing member provided below the lower bearing and having a lip that contacts the outer periphery of the shaft;
A drum-type washing machine characterized by comprising the above.

Images