JP4670823B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine that cleans laundry stored in a rotating drum by rotationally driving a rotating drum disposed in a water tank.

  Conventionally, this type of washing machine is generally configured as shown in FIG. 8 (see, for example, Patent Document 1). Hereinafter, the structure will be described with reference to the longitudinal sectional view of FIG.

  In FIG. 8, an outer tub 3 supported by a suspension structure 2 and a rotating drum 4 rotatably supported in the outer tub 3 are disposed on a main body 1 of the drum type washing machine.

  A reinforcing base plate 5 provided to maintain strength is fixed to the outer bottom of the rotating drum 4, and one end of the rotating shaft 16 is fixed to the base plate 5 at the center of rotation of the rotating drum 4. The other end is fixed to the slave pulley 6.

  A motor 7 disposed on the outer bottom surface of the outer tub is connected to the slave pulley 6 via a belt 8, and the rotating drum 4 is rotated at a first rotation speed N1 (for example, 45 r / min) to change the clothing. Washing and rinsing are performed with stirring, and centrifugal dehydration is performed by rotating at a second rotational speed N2 (for example, 1000 r / min).

  Opening and closing the lid body 9 that can be opened and closed on the front side of the main body allows the laundry to be taken in and out of the rotary drum 4 through the front side opening 3a of the outer tub 3 and the front side opening 4a of the rotary drum 4. Can be done.

  Further, a water supply valve 10 including a water supply valve is disposed in the upper space in the main body, and the water supplied from the water supply valve 10 is supplied into the outer tub 3 through the water supply hose 11, The water stored in the outer tub 3 flows into the rotating drum 4 through many water holes 15 formed in the rotating drum 4.

  A bearing case 17 that holds bearings 19 and 20 that support the rotation of the rotary shaft 16 is fixed to the outer bottom portion (right side in FIG. 8) of the water tank 3, and water is inserted into a portion of the bearing case 17 that penetrates the rotary shaft 16. An oil seal 18 for sealing is arranged to prevent water from entering the outside of the water tank 3 such as the bearings 19 and 20.

Further, a drain port 4b is provided at the bottom of the outer tub 3, and when the drain pump 13 connected to the drain port 4b is opened, the water in the outer tub 3 is discharged out of the machine.
JP-A-10-272288

  However, in the conventional configuration described above, in order to avoid problems such as contamination of clothing due to corrosion by water and destruction due to strength deterioration in the rotating drum and outer tank parts, the member that directly contacts the supplied water is stainless steel or the like. It is necessary to use a member having excellent corrosion resistance or to use a sufficiently rust-proof material.

  In particular, in the rotating shaft, it is necessary to perform water sealing with an oil seal in order to receive stress concentration on a portion held by the bearing and to prevent water from entering the bearing.

The part that contacts the lip part of the oil seal is required to have sufficient abrasion resistance and strength because it slides at high speed during the dehydration operation of the rotating drum. The material itself is made of a corrosion-resistant stainless steel material, etc., and the surface held by a bearing is subjected to induction hardening to improve the hardness and strength.

  In addition, water may also enter the fixed surface between the base plate and the rotating shaft of the rotating drum. Therefore, to prevent corrosion due to water, the fixed surface of the rotating shaft is formed by insert molding when forming the base plate. Measures are taken such as removing the intruding part or processing the rotating shaft itself by hot forging such as stainless steel.

  When the former is formed by insert molding, secondary processing is required to make the rotation axis coincide with the rotation center of the base plate, so that workability is deteriorated and productivity is deteriorated. In addition, in the case of repair work where the rotating drum is replaced, considering the serviceability, the rotation shaft and the bearing are fixed freely so that the rotation shaft can disassemble the inner ring of the bearing in the axial direction for disassembly. Therefore, there is a possibility that a phase difference occurs in the rotation between the rotating shaft and the inner ring of the bearing, and abnormal wear and noise occur due to the creep phenomenon of the rotating shaft.

  In addition, when the latter rotary shaft is entirely made of stainless steel or the like by hot forging, the processing of the rotary shaft itself is complicated, resulting in a decrease in productivity and processing cost, resulting in an increase in product cost. there were.

The present invention, above problems solves the while maintaining the services of such replacement of the rotary drum, there is no fear of wear and abnormal noise of the rotating shaft, high drum reliability at low cost An object is to provide a washing machine.

In order to solve the above-described conventional problems, the drum type washing machine of the present invention has a rotating drum whose axis is inclined in a substantially horizontal direction or downward from the front side to the back side of the casing, and an outer part including the rotating drum. A tank, a base plate provided at a position between the bottom of the rotating drum and the outer tank and attached to the bottom of the rotating drum, a rotating shaft connected and fixed to the base plate, and a shaft supporting the rotating shaft A bearing case that is fixed to the outer tub and accommodates the bearing; and an oil seal for sealing the rotating shaft that is disposed closer to the rotating drum than the bearing. The rotating shaft has a cylindrical shape. The shaft member is composed of a substantially annular flange member having a disk portion and a cylindrical portion, and the shaft member is press-fitted and integrated with an inner diameter of the cylindrical portion of the flange member, and the disk portion of the flange member is the base The drum is connected and fixed to support the rotating drum, the outer periphery of the cylindrical portion of the flange member is brought into contact with the lip portion of the oil seal, and a substantially concave shape is formed at a position where the tip end portion of the shaft member and the flange member face each other. A fixed groove is formed, a seal ring is provided in the fixed groove, an innermost peripheral portion of the seal ring is in contact with the shaft member, and an outermost peripheral portion of the seal ring is in contact with the flange portion .

Thus, it becomes possible to prevent water from entering the exchange of serviceability an improved furuncle one shaft member of the rotary drum.

The drum type washing machine of the present invention can prevent water from entering the shaft member while improving serviceability of replacement of the rotating drum .

The first invention includes a rotary drum of the downward inclination toward the rear side from the axial center substantially front side of the horizontal direction or the housing, an outer tub that inner wrap the rotary drum, the outer tub and the bottom of said rotary drum a base plate attached to the bottom of the rotary drum is provided at a position between a rotary shaft which is fixedly connected to the base plate, a bearing for supporting the shaft of the rotary shaft is fixed to the outer tub before Symbol a bearing case accommodating the bearing, and an oil seal for the rotary shaft water seal which is arranged on the rotary drum side of the bearings, the rotary shaft includes a shaft member of a circle columnar, circular plate portion and the cylindrical portion And the shaft member is press-fitted and integrated with the inner diameter of the cylindrical portion of the flange member, and the disk portion of the flange member is connected and fixed to the base plate to fix the rotating drum. Support The outer periphery of the cylindrical portion of the flange member is contacted with the lip portion of the oil seal, wherein the flange member and the distal end portion of the shaft member constitute a fixing groove of generally concave at a position opposite the seal ring to the fixing groove And the innermost peripheral portion of the seal ring is in contact with the shaft member and the outermost peripheral portion of the seal ring is in contact with the flange portion . Infiltration of water can be prevented .

According to a second aspect of the invention, in the first aspect of the invention, a substantially convex small cylindrical portion is formed on a surface of the tip portion of the shaft member facing the base plate, and a substantially concave shape is formed between the cylindrical portion of the flange member. By configuring the fixed groove, the seal ring can be securely fixed to the fixed groove and sealed with water, and the rod-shaped shaft member can be configured by simple processing. Can be processed at low cost.

In a third aspect of the invention, in particular in the first aspect of the invention, a step-like large diameter portion is formed on the inner diameter portion of the press-fitting fitting portion with the shaft member on the surface of the disk portion of the flange member facing the base plate, Since a substantially concave fixing groove is formed between the shaft member and the outer diameter, the seal ring can be securely fixed to the fixing groove and water-sealed and sealed, and the flange member can be simply processed. It is possible to perform the process for fixing the seal ring at a low cost .

Embodiments of the following Shitahon invention will be described with reference to the drawings. In addition, this plan is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a drum type washing machine according to a first embodiment of the present invention, FIG. 2 is a sectional view of a main part of the drum type washing machine, and FIG. 3A is a rotation of the drum type washing machine. FIG. 3B is a partial exploded view of the shaft portion, and FIG. 3B is a partial cross-sectional view of the rotating shaft portion of the drum type washing machine. In addition, the same code | symbol is attached | subjected about the same part as a prior art example, and the description is abbreviate | omitted.

  As shown in FIG. 1, the rotating drum 4 is formed in a bottomed cylindrical shape, and a large number of water passage holes 15 are provided on the entire surface of the rotating drum 4, and the rotating drum 4 is rotatably disposed in the outer tub 3. The rotating shaft 16 is fixed to the rotation center of the rotating drum 4 in a substantially inclined direction, and the axial center direction of the rotating drum 4 is disposed to be inclined downward from the front side to the back side.

  In addition, a water supply valve 10 including a water supply valve is disposed in the upper space in the main body, and water supplied from the water supply valve 10 passes through a water injection pipe 14 connected to the bottom of the detergent case 12 and is discharged outside. Water supplied from the water injection port 14 a provided above the tank 3 into the outer tank 3 and stored in the outer tank 3 flows into the rotating drum 4 through a number of water holes 15 formed in the rotating drum 4.

  Further, a drain port 4b is provided at the rear of the bottom of the rotary drum 4. When the drain valve 21 connected to the drain port 4b is opened, the water in the outer tub 3 is discharged outside the machine through the drain pipe 22. The

  The rotation of the motor 7 attached to the outer bottom surface of the outer tub 3 is stretched between the driving pulley 23 fixed to the rotating shaft 7 a of the motor 7 and the driven pulley 6 fixed to the end of the rotating shaft 16. Conducted by the V-belt 8 to the rotary shaft 16, the rotary drum 4 is driven to rotate in the forward and reverse directions.

  Several projecting plates 24 are provided on the inner wall surface of the rotating drum 4 to perform a stirring operation of lifting and dropping clothes in the rotation direction, so-called tapping.

  A flange-like base plate 5 is fixed to the bottom of the rotating drum 4 (right side in FIG. 1) so that the center of rotation coincides with the rotating drum 4 in order to ensure the strength of the bottom.

  The configuration of the rotary shaft 16, the base plate 5, and the bearing case 17 will be described with reference to the cross-sectional view of the main part of FIG. 2, the partially exploded view of FIG. 3A, and the partial cross-sectional view of FIG.

  In FIG. 2, the rotating shaft 16 has two members: a cylindrical shaft member 16a processed with a general steel material such as S45C, and a flange member 16b processed into a flange shape using a material having excellent corrosion resistance such as stainless steel. The shaft member 16a is press-fitted and fitted into the flange member 16b.

  The rotating shaft 16 is rotatably supported by a shaft member 16a portion by a large bearing A19 on the rotating drum 4 side and a bearing B20 on the driven pulley 6 side mounted on a bearing case 17 provided at the bottom of the outer tub 3, particularly stress. Is press-fitted and fixed to the inner ring of the large bearing A19.

  Further, the rotary shaft 16 is configured to be slidably contacted with the lip portion 18a of the water seal oil seal 18 of the rotary shaft 16 at the flange member 16b portion.

  As shown in the exploded view of FIG. 3A, the flange member 16 b has a disk part 30 and a cylindrical part 31, and the disk part 30 is provided with a screw hole 32 for attaching the base plate 5.

  Further, the tip of the shaft member 16a is processed so as to form a small-diameter cylindrical portion 16a-1 in a convex shape, and after press-fitting with the flange member 16b, as shown in the partial cross-sectional view of FIG. A concave fixing groove 16c is formed.

  As shown in FIG. 2, a seal ring 25 such as an O-ring is mounted in the fixed groove 16c, and the rotary shaft 16 is fixed to face the surface 5a provided at the center of the base plate 5 behind the rotary drum 4. By fixing with the bolts 26, the rotary shaft 16 and the rotary drum 4 are fixed, and the seal ring 25 is fixed in a watertight manner.

  The shaft member 16 a of the rotary shaft 16 is press-fitted with an outer diameter portion to the inner ring of the bearing A 19, and the bearing A 19 has the outer ring fitted to the bearing case 17.

  The outer ring of the bearing B20 is fitted in the bearing case 17, and the inner ring is loosely fixed to the outer diameter of the shaft member 16a.

  The oil seal 18 for water sealing of the rotating shaft 16 is fixed to the bearing case 17 so that the lip portion 18a is in sliding contact with the outer peripheral portion of the cylindrical portion 31 of the flange member 16b of the rotating shaft 16, and the bearing A19, Prevents water from entering the bearing B20. The outer surface of the flange member 16b of the rotating shaft 16 that comes into contact with the lip portion 18a of the oil seal 18 is subjected to induction hardening to improve the wear resistance.

  The operation of the drum type washing machine configured as described above will be described below.

In the first embodiment, the rotary shaft 16 is formed of a flange member 16b processed with a stainless steel having excellent corrosion resistance and a shaft member 16a processed with a general steel material, and the shaft member 16a is configured with a general steel material. The seal structure that prevents the ingress of water can be realized inexpensively and easily, and the serviceability such as replacement of the rotating drum 4 can be separated from the rotating shaft 16 by loosening the fixing bolt 26, so that the workability is also excellent. To achieve this configuration.

  Further, since the shaft member 16a is press-fitted into the inner ring of the bearing A19 on the rotating drum 4 side, a creep phenomenon of the rotating shaft (shaft member) due to a phase difference also occurs in the rotation with the bearing inner ring during high speed dewatering operation. There is nothing.

  In addition, the seal member holding configuration described in the seal ring 25 of the rotary shaft 16 can be configured at the same time during the assembly process in which the shaft member 16a and the flange member 16b are press-fitted and fixed, so that the processing accuracy and workability are improved, and the manufacturing is performed. Since the time can be shortened, productivity can be improved.

(Embodiment 2)
FIG. 4 is a cross-sectional view of an essential part of a drum type washing machine according to a second embodiment of the present invention, FIG. 5 (a) is a partially exploded view of a rotating shaft portion of the drum type washing machine, and FIG. It is a fragmentary sectional view of the rotating shaft part of the drum type washing machine.

  Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  In FIG. 4, the rotary shaft 16 is configured by press-fitting a flange member 16 b processed into a flange shape using a material having excellent corrosion resistance such as stainless steel to a rod-shaped shaft member 16 a processed with a general steel material such as S45C. The

  As shown in the partially exploded view of FIG. 5A, the flange member 16b of the rotary shaft 16 has a large-diameter portion 16b-1 in a stepped shape in which the inner diameter portion of the cylindrical portion 31 is enlarged on the end surface of the disk portion 30. After forming and press-fitting with the shaft member 16a, a concave fixing groove 16c shown in the partial cross-sectional view of FIG.

  As shown in FIG. 4, a seal ring 25 such as an O-ring is mounted in the fixed groove 16c, and the rotary shaft 16 is opposed to the surface 5a provided at the center of the base plate 5 behind the rotary drum 4. By fixing with the fixing bolt 26, the rotating shaft 16 and the rotating drum 4 are fixed and the seal ring 25 is fixed in a watertight manner, and the washing water does not penetrate into the shaft member 16a.

  In the second embodiment configured as described above, it is possible to obtain a rotary shaft configuration that is inexpensive and excellent in corrosion resistance, similar to the first embodiment.

(Embodiment 3)
FIG. 6 is a cross-sectional view of an essential part of a drum type washing machine according to a third embodiment of the present invention, FIG. 7A is a partially exploded view of a rotating shaft portion of the drum type washing machine, and FIG. It is a fragmentary sectional view of the rotating shaft part of the drum type washing machine.

  Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  In FIG. 6, the rotary shaft 16 is configured by press-fitting a flange member 16 b processed into a flange shape using a material having excellent corrosion resistance such as stainless steel to a rod-shaped shaft member 16 a processed with a general steel material such as S45C. ing.

  As shown in the partial cross-sectional view of FIG. 7B, when the shaft member 16a of the rotating shaft 16 is press-fitted into the flange member 16b, the tip of the shaft member 16a protrudes from the end surface of the disk portion 30 of the flange member 16b. It press-fits so that the part 16d may be comprised.

  On the other hand, in the central portion of the base plate 5 behind the rotary drum 4, a concave portion 5a having a substantially concave shape is formed in advance, and a fixed groove 16c constituted by the protruding portion 16d and the flange member 16b is formed.

  A seal ring 25 such as an O-ring is disposed in the fixing groove 16c. The seal ring 25 is fixed in a watertight manner by fixing the base plate 5 and the flange member 16b with fixing bolts 26, and is washed on the shaft member 16a. Water does not penetrate.

  As a result, in the third embodiment, the processing of the flange member 16b and the shaft member 16a is simplified, and it is possible to obtain a rotary shaft configuration that has the same low cost and excellent corrosion resistance as that of the first embodiment. Become.

  In addition, regarding this Embodiment 1-3, although O-ring was used as the seal ring 25, if there exists a seal member fixed to the fixed groove 16c comprised in the rotating shaft 16, the same sealing effect can be acquired. Is possible.

  Moreover, about the flange member holding | maintenance structure of a rotating shaft, since a column-shaped shaft member is press-fitted and fixed to a cylindrical part, processing accuracy and workability can be improved and manufacturing time can be shortened, so that productivity can be improved.

  Although the configuration of the embodiment described above is applied to an oblique drum type drum-type washing machine in which the rotary drum 4 is inclined, the same applies to a general configuration in which the rotary drum 4 is horizontally arranged. Can be applied to.

  In addition to the drum-type washing machine, if it is an electric device that has the rotating drum 4 and is operated in contact with the rotating shaft 16, it is possible to obtain the same effect by adopting the same configuration. Needless to say.

  As described above, the drum-type washing machine according to the present invention is formed of a flange member processed with stainless steel having excellent corrosion resistance and a shaft material processed with a general steel material, and water enters the shaft member. Therefore, it can be used for equipment having a rotating drum and the like and requiring a waterproof function.

The longitudinal cross-sectional view of the drum type washing machine in Embodiment 1 of this invention Cross section of the main part of the drum type washing machine (A) Partial exploded view of the rotating shaft portion of the drum type washing machine (b) Partial sectional view of the rotating shaft portion of the drum type washing machine Sectional drawing of the principal part of the drum type washing machine in Embodiment 2 of this invention. (A) Partial exploded view of the rotating shaft portion of the drum type washing machine (b) Partial sectional view of the rotating shaft portion of the drum type washing machine Sectional drawing of the principal part of the drum-type washing machine in Embodiment 3 of this invention. (A) Partial exploded view of the rotating shaft portion of the drum type washing machine (b) Partial sectional view of the rotating shaft portion of the drum type washing machine Vertical section of a conventional drum-type washing machine

DESCRIPTION OF SYMBOLS 1 Washing machine housing | casing 3 Outer tub 4 Rotating drum 5 Base plate 16 Rotating shaft 16a Shaft member 16a-1 Small diameter cylindrical part 16b Flange member 16b-1 Large diameter part 16c Fixed groove 17 Bearing case 18 Oil seal 18a Lip part 19, 20 Bearing 25 Seal ring 26 Fixing bolt 30 Disk part 31 Cylindrical part

Claims (3)

A rotary drum of the downward inclination toward the rear side from the axial center substantially front side of the horizontal direction or the housing, an outer tub that inner wrap the rotary drum, in a position between the outer tub and the bottom of said rotary drum a base plate attached to the bottom of the rotary drum is provided, the bearing case accommodating a rotation shaft which is connected and fixed to the base plate, a bearing for supporting the shaft of the rotary shaft, the prior SL bearing is fixed to the outer tub When, an oil seal for the rotary shaft water seal which is arranged on the rotary drum side of the bearings, the rotary shaft includes a shaft member of a circle columnar, substantially annular having a circular plate portion and a cylindrical flange constituted by a member, by integrating the said shaft member press-fitted to the cylindrical inner diameter of the flange member, the disk portion of the flange member supports the rotary drum and connected and fixed to the said base plate, said flange The outer periphery of the cylindrical portion of the timber in contact with the lip of the oil seal, wherein the flange member and the distal end portion of the shaft member constitute a fixing groove of generally concave at a position opposite the seal ring provided in the fixing groove, A drum-type washing machine, wherein an innermost peripheral portion of the seal ring contacts the shaft member and an outermost peripheral portion of the seal ring contacts the flange portion . The drum-type laundry according to claim 1 , wherein a substantially convex small cylindrical portion is formed on a surface of the tip portion of the shaft member facing the base plate, and a substantially concave fixing groove is formed between the cylindrical portion of the flange member. Machine. A stepped large-diameter portion is formed in the inner diameter portion of the press-fitting fitting portion with the shaft member on the surface of the flange portion of the disk portion facing the base plate, and is fixed substantially concavely between the outer diameter of the shaft member. 1 Symbol mounting of the drum type washing machine according to claim to constitute a groove.

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