JP2011072350A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine configured so that the rotation balance of a rotation drum is well adjusted. <P>SOLUTION: The washing machine includes the rotation drum for washing laundry, an outer tub for storing washing water and housing the rotation drum therein, a rotation drum driving system including a drive motor which supports the rotation drum so that a rear end side on one end side in the rotation axis direction of the rotation drum is cantilevered, an outer frame for housing the outer tub, and an antivibration mechanism for absorbing vibration and supporting the outer tub on the outer frame. The rotation drum has a drum tub for holding the laundry, and the drum tub has a cylindrical body portion formed of a steel sheet including stainless steel, a bottom plate closing the rear end side of the body portion and formed of a steel sheet including stainless steel, and an annular fastening portion for fastening the outer peripheral side of the bottom plate and the rear end side of the body portion to each other over the whole periphery of the body portion. A counter weight for adjusting the rotation balance of the rotation drum is provided at a part of the annular fastening portion which is located on a side having a reduced weight based on an imbalance in the rotation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an unbalance reduction of a washing machine including a rotating drum. The washing machine of the present invention includes a washing machine having only a washing function and a washing / drying machine that performs washing and drying.

  A washing machine related to this unbalance reduction is described in, for example, Japanese Patent Laid-Open No. 6-269593 (Patent Document 1).

  The washing machine shown in Patent Document 1 is an effective invention for eliminating the imbalance caused by the lint filter.

JP-A-6-269593

The dewatering washing machine shown in Patent Document 1 is intended to reduce unbalance by disposing a weight at a position 180 ° from the lint filter at the bottom of the washing and dewatering tank in order to eliminate the unbalance due to the lint filter. .

  However, the rotating drum including the washing and dewatering tank has various unbalance factors including the lint filter, and it is desired to adjust the unbalance with respect to the entire rotating drum.

  Further, in the configuration of the cantilever support mechanism that supports one side of the rotating drum, the amplitude of vibration due to unbalance is larger than that of the both-side support. On the other hand, the rotational speed of the rotating drum tends to increase in order to further increase dehydration. In addition to this, there is a tendency to suppress the gap between the outer diameter of the rotating drum and the inner diameter of the outer tub in response to a demand for making the outer frame of the washing machine compact while pursuing an increase in washing capacity. In order to respond to this, it is required to further improve the accuracy of balance adjustment.

  In the washing machine shown in Patent Document 1, a weight for balance adjustment is provided in an intermediate portion (intermediate portion between the center and the outer periphery) of the washing and dewatering tub. Balance adjustment is better on the outer peripheral side than near the center of rotation. In addition, the balance adjustment weight is fixed with a screw. In order to select the stop position, the installation position of the balance adjustment weight is limited, and the balance adjustment weight cannot be set at the optimum position for balance adjustment. Can also happen. For this reason, it is not possible to meet a good balance adjustment with high accuracy.

  An object of this invention is to provide the washing machine in which the balance adjustment of a rotating drum is performed favorably in view of said subject.

  The present invention provides a rotating drum for washing laundry, an outer tub for storing washing water and in which the rotating drum is placed, and the rotating drum cantilevered at the rear end side which is one end side in the direction of the rotation axis. A rotating drum driving system including a driving motor that supports the outer tub, an outer frame in which the outer tub is placed, and an anti-vibration mechanism for supporting the outer tub in an anti-vibration manner on the outer frame. The drum tank has a cylindrical body portion formed of a steel plate including stainless steel, a bottom plate formed of a steel plate including stainless steel that covers the rear end side of the body portion, and the bottom plate. A counterweight that adjusts the rotational balance of the rotating drum is unbalanced due to an imbalance in the rotational balance, and an annular fastening portion that fastens the outer peripheral side of the body portion and the rear end side of the body portion over the entire circumference of the body portion. Of the annular fastening part located on the lighter side Characterized in that provided in the position.

  According to the present invention, since the counterweight is provided in the annular fastening portion that fastens the outer peripheral side of the bottom plate forming the drum tank of the rotating drum and the rear end side of the trunk portion over the entire circumference of the trunk portion, It is possible to provide a washing machine in which the rotation balance is well adjusted.

FIG. 4 is a longitudinal sectional view of the entire washing and drying machine according to an embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a washing mechanism main body according to an embodiment of the present invention. FIG. 5 is a plan view of the rear side of the rotary drum as viewed from the outside according to the embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a rotating drum according to an embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view of the rear side (portion A in FIG. 4) according to the embodiment of the present invention. FIG. 5 is a cross-sectional view showing a rear counterweight attached to an annular fastening portion of a rotary drum where a support arm of a bottom plate reinforcing base is provided (B portion in FIG. 4) according to an embodiment of the present invention. It is sectional drawing which shows the back side counterweight attached to the annular | circular fastening part of the rotating drum in the place which does not have the support arm of a baseplate reinforcement base concerning the Example of this invention. FIG. 6 is a perspective view of a single rear counterweight according to an embodiment of the present invention. FIG. 4 is a side view of a rear counterweight unit according to an embodiment of the present invention. FIG. 7 is a diagram showing another rear counterweight according to the embodiment of the present invention and corresponding to FIG. 6 described above. FIG. 9 is a view showing another rear counterweight corresponding to the embodiment of the present invention and corresponding to FIG. 7 described above. FIG. 6 is a perspective view of a single rear counterweight according to an embodiment of the present invention. It is a side view which concerns on the Example of this invention and shows the other back side counterweight single-piece | unit. FIG. 4 is a perspective view of the rotating drum as viewed from the front side according to the embodiment of the present invention. It is a perspective view which shows the storage recessed part which concerns on the Example of this invention and provides a front side counterweight. FIG. 6 is a cross-sectional view illustrating a state where a front counterweight is attached to the storage recess according to the embodiment of the present invention.

  Examples according to embodiments of the present invention will be described with reference to the drawings.

  The washing machine of the present invention includes a washing machine having only a washing function and a washing / drying machine that performs washing and drying. In this embodiment, a washing / drying machine will be described. In addition, the washing and drying machine of the present embodiment has a configuration in which the opening of the rotating drum is obliquely upward. However, the present invention can be used in various forms of washing in which the rotating drum is placed horizontally (horizontally) or vertically. Applicable to the machine.

  First, the outline | summary of the washing-drying machine based on the Example of this invention is demonstrated along FIG.

  The washing / drying machine includes an outer frame housing 1 and a washing mechanism main body that is supported by a suspension 3 and a tension spring 4 in the outer frame housing.

  The washing mechanism main body has an outer tub 2. The outer tub 2 is made of synthetic resin and stores washing water. The outer tub 2 is supported from below by a plurality of suspensions 3 at the rear of the center. Further, the upper part of the outer tub 2 is suspended and supported by the pull spring 4 so that the washing mechanism main body is supported in a vibration-proof manner.

  The suspension 3 supports the entire weight of the washing mechanism main body including the outer tub 2, has a strong elastic support structure, and is fixed to the outer frame base 20 of the outer frame housing 1. In particular, a damping mechanism is provided to absorb strong vertical and horizontal vibrations of the outer tub 2 that occur during dehydration operation, and to suppress abnormal vibration of the outer tub 2 that occurs at the time of dehydration startup and unbalanced vibration associated with high-speed dewatering rotation (about 1800 RPM). It has been.

  Further, the pulling spring 4 for supporting the outer tub 2 by suspending it from the upper part is provided to support the falling of the outer tub 2 and to prevent vertical / horizontal vibration during dehydration.

  A water supply electromagnetic valve 6 and a detergent charging case 8 are provided inside the upper side of the outer frame housing 1. The detergent charging case 8 is connected to the water supply electromagnetic valve 6 through a water injection hose 7. A water supply hose 5 is connected to the water supply electromagnetic valve 6. The tip of the water supply hose 5 is connected to a tap (not shown).

  When washing is too easy, the water supply electromagnetic valve 6 is opened, and water necessary for washing and washing is supplied from the water injection hose 7 to the detergent charging case 8.

  A detergent necessary for washing is put into the detergent charging case 8. Further, at the time of rinsing, a softening finish for improving the finish of the laundry is put into the case portion for storing the finish provided in the detergent charging case 8 and automatically put into the outer tub 2 when necessary. At the time of washing, the detergent is dissolved in the detergent charging case 8 by the water supplied from the water injection hose 7, flows through the flexible hose 10, and is charged into the inside from the upper part of the outer tub 2.

  The rotating drum 11 has a drum tank 11 a and a fluid balance ring 13. The rotating drum 11 is rotatably installed in the outer tub 2. The drum tub 11 a for washing the loaded laundry 9 has a cylindrical body part 110, a bottom plate 111 that closes the rear end side of the body part 110, and an opening provided on the front end side of the body part 110.

  The fluid balance ring 13 attached and fixed to the opening of the drum tank 11a has a ring shape, and has a loading port 11b through which the laundry is taken in and out of the rotating drum 11. The rotating drum 11 is disposed so that the front side faces the front side of the outer frame casing 1 and the bottom plate 111 faces the rear side of the outer frame casing 1.

  The drum tank 11a has an annular fastening portion 112 that fastens a body portion 110 formed of a steel plate containing stainless steel and a bottom plate 111 formed of a steel plate containing stainless steel.

  Since the cylindrical outer tub 2 and the similarly cylindrical rotating drum 11 are placed so that the cylindrical axis is concentric, the gap between the outer periphery of the rotating drum 11 and the inner periphery of the outer tub 2 is uniform. The charging port 11 b of the rotary drum 11 is arranged so as to face the charging port 11 c provided on the front side of the outer frame housing 1.

  The outer tub 2 and the rotating drum 11 are arranged so as to be inclined so that the front end side where the charging port 11b of the rotating drum 11 is provided is upward and the rear end side is downward. This inclination angle (angle of the axial center line with respect to the horizontal line) θ is 15 degrees. Although an inclination angle of about 15 degrees is desirable for taking out the laundry, the inclination angle θ can be selected within a range of about (5 to 30) degrees.

  The outer frame housing 1 is provided with an outer lid 12 that opens and closes the insertion port 11c. When the laundry is put in and out of the rotating drum 11, the outer lid 12 is opened and closed.

  The bellows 21 is attached in a watertight manner to the mouth edge of the inlet 11 c of the outer frame housing 1 and the inner edge of the inlet 11 d of the outer tub 2. Water-tightness between the outer frame casing 1 and the outer tub 2 is maintained by a bellows 21 made of rubber (elastic body). Since the inner side of the outer lid 12 is in close contact with the bellows 21, no water leaks from the inlet 11c of the outer frame housing 1 to the outside.

  The rotating drum 11 has a plurality of dewatering holes 14 in the body portion 110 of the drum tank 11a. At the time of dehydration, water contained in the laundry is dehydrated into the outer tub 2 by centrifugal force through the dehydration hole 14. A plurality of (three) lifters 16 disposed at equal intervals on the inner periphery are provided on the body portion of the drum tank 11a. The lifter 16 extends along the direction of the rotational axis of the rotary drum 11. The height of the lifter 16 is generally the same height over the longitudinal direction.

  The DC brushless motor 19 is a drive motor for the rotating drum 11. A drive motor included in the rotary drum drive system is attached and fixed to the rear outer surface of the outer tub 2. The rotary drum 11 has a bottom plate reinforcing base 17 made of metal that reinforces the bottom plate 111 forming the drum tank 11a. The center of the bottom plate reinforcing base 17 is coupled to the rotor of the DC brushless motor 19 through the rotation support shaft 18. Thus, the rotary drum 11 is rotatably supported by the outer tub 2 via the DC brushless motor 19.

  The drainage hose 23 of the drainage channel is provided so that one end communicates with the lower rear portion of the outer tub 2, and the other end side extends through the outer frame base 20 of the washing / drying machine and is inserted into the drainage hole of the house. The A drainage electromagnetic valve 22 is provided in the middle of the drainage hose 23, and the drainage electromagnetic valve 22 is opened to drain the washing water accumulated in the outer tub 2.

  Next, the main part of the present invention will be described with reference to FIGS.

  As shown in FIGS. 2, 3, and 14, the rotating drum 11 includes a drum tank 11 a and a fluid balance ring 13. The drum tank 11a is a steel plate containing stainless steel, and the fluid balance ring 13 is formed of a synthetic resin. The drum tank 11a has a body portion 110 made of stainless steel and a bottom plate 111 made of stainless steel.

  In this embodiment, the opening of the rotary drum 11 is placed forward and the bottom plate 111 is placed rearward. When the rotary drum 11 is placed vertically, the bottom plate 111 is directed downward and the front opening is directed upward. The rotary drum 11 is supported by a drive motor included in the drive system via a bottom plate reinforcement base 17 provided on the outer surface of the bottom plate 111. That is, the rotating drum 11 supports one end side (the bottom plate 111 and the bottom plate reinforcing base 17) in the rotation axis direction with a rotating drum driving system including a driving motor, and a fluid on the other end side opposite to the one end side. A balance ring 13 is arranged. This is a so-called cantilever-supported rotation support mechanism that includes a fluid balance ring 13 at the opening of the drum tub 11a on the opposite side of the support side and suppresses rotational unbalance that occurs due to uneven distribution of the laundry 9. ing.

  The fluid balance ring 13 reduces the vibration of the unbalancer due to the laundry 9 during the dehydrating operation. As shown in FIGS. 2, 14, 15, and 16, the fluid balance ring 13 includes a storage recess 31 that stores a fluid storage portion 30 and a front counterweight 33 (a block in which stainless steel plate plates are stacked). Have. The front counterweight 33 adjusts the rotational balance of the rotary drum 11.

  The fluid balance ring 13 is provided with a plurality of concentrically arranged annular fluid storage chambers arranged side by side in the radial direction. The plurality of fluid storage chambers are provided with ribs (not shown) in the radial direction so as to prevent fluid from flowing freely without resistance in the circumferential direction. An aqueous solution of sodium chloride, potassium chloride, calcium chloride, or the like is used as a material that has a high specific gravity and does not spoil the fluid liquid filled in the fluid storage chamber.

  The fluid balance ring support plate 40 is formed of a stainless steel plate, and the outer peripheral end is fastened to the opening end of the drum tank 11a by folding. Since the fluid balance ring 13 is supported by the fluid balance ring support plate 40, the fluid balance ring 13 is firmly supported so as to withstand strong vibration, unlike the case where the fluid balance ring 13 is directly attached to the drum tank 11a. . The outer tank cover 32 is provided so as to cover the fluid balance ring 13 from the outside. The outer tub cover 32 is attached and supported on the front side (opening end side) of the outer tub 2 at the outer peripheral side.

  The front counterweight 33 to be inserted into the storage recess 31 of the fluid balance ring 13 is provided on the lighter side of the rotating balance of the rotating drum 11 due to an unbalanced rotational balance. Thereby, the unbalance of the rotation balance is adjusted on the front side of the rotating drum 11.

  Further, the counterweight 33 is appropriately weighted according to the unbalance of the rotation balance, so that the unbalance adjustment of the rotation balance is performed more appropriately. On the rear side of the rotating drum 11, the unbalance adjustment of the rotation balance is performed by a rear counterweight described later. In this way, by adjusting the rotational imbalance existing in the rotating drum itself with the front and rear counterweights, it is possible to provide a washing and drying machine with less vibration even in a dehydrating operation in which the rotating drum is rotated at a high speed dewatering rotation (about 1800 RPM).

  The rotational unbalance of the rotating drum 11 is measured with a rotational balance measuring machine. With this measurement, the unbalanced weight of the rotational balance of the rotating drum 11 and the position of the unbalanced and lighter weight can be known. The rotational balance of the rotary drum 11 is adjusted by selecting the front counterweight 33 having a weight corresponding to the unbalanced weight and setting it in the storage recess 31 that is a portion of the fluid balance ring that is positioned at the lighter weight. The When there are a plurality of positions having lighter weights, adjustment is made by selecting the front counterweight 33 having a weight corresponding to the unbalanced weight and setting it at each position. Measurement is performed again after adjusting the rotational balance. If the rotational balance is insufficiently adjusted, the front counterweight 33 is attached and readjustment is performed. The rear side of the rotating drum is similarly adjusted using the rear counterweight.

  The measurement of the rotational imbalance and the attachment of the front and rear counterweights are performed by the rotating drum alone before the rotating drum is incorporated into the main body of the washing machine. If incorporated in the main body of the washing machine, it is difficult to measure rotational imbalance and attach front and rear counterweights, and there are many problems that must be overcome.

  The storage recess 31 is provided so that the insertion port for inserting the counterweight 33 faces the outer tank cover 32 provided so as to cover the fluid balance ring 13 from the outside. For this reason, unlike the case where the insertion opening of the storage recess is provided inward of the drum tank 11a, the laundry moving around in the drum tank 11a does not come into contact with the storage recess 31 or the front counterweight 33 and is not damaged. Further, unlike the case where the storage recess 31 is provided on the outer peripheral side of the fluid balance ring 13, a sufficient gap can be secured between the storage recess 31 or the front counterweight 33 and the outer tub 2.

  As shown in FIGS. 14, 15, and 16, the storage recess 31 is formed by a storage inner peripheral wall 31a, a storage outer peripheral wall 31b, and a partition wall 31c. The small-diameter storage inner peripheral wall 31a and the large-diameter storage outer peripheral wall 31b are concentrically arranged with respect to the rotation axis of the drum tank 11a, like the fluid storage chamber. The partition walls 31c are provided radially at equal intervals between the small-diameter storage inner peripheral wall 31a and the large-diameter storage outer peripheral wall 31b. For this reason, a plurality (32) of the storage recesses 31 partitioned by the partition wall 31c are arranged at equal intervals on a circumference centering on the rotation axis of the rotary drum.

  Since a large number of storage recesses 31 arranged at equal intervals are provided, an appropriate position for attaching the front counterweight 33 can be selected. Further, since the storage recess 31 is a recess surrounded by the storage inner peripheral wall 31a, the storage outer peripheral wall 31b, and the partition wall 31c, the position of the inserted front counterweight 33 is maintained. The position of the front counterweight 33 does not shift, and there is no rotation balance error after adjustment.

  As shown in FIG. 15, the housing recess 31 is provided with a boss 34 that protrudes from the back side (bottom side) toward the outside. The counterweight 33 inserted into the storage recess 31 is received by the boss portion 34. The counterweight 33 is fixed to the storage recess 31 by screwing a screw 36 (stopper) inserted into a screw through hole 35 penetrating the center of the counterweight 33 into a screw hole of the boss portion 34.

  As shown in FIG. 15, the boss portion 34 has four reinforcing ribs 34 a and 34 b on the outer periphery. The reinforcing rib 34 a is formed in the longitudinal direction of the rectangular storage recess 31. The reinforcing rib 34b is formed in the short direction of the rectangular storage recess 31. The reinforcing rib 34 b is connected to the inner wall surface of the storage recess 31, but the reinforcing rib 34 a does not reach the inner wall surface of the storage recess 31. For this reason, the front counterweight 33 stored in the storage recess 31 is pushed out of the storage recess 31 so that the other end in the longitudinal direction of the counterweight 33 is lifted by pushing the end (one) of the counterweight 33 in the longitudinal direction. Since the replacement of the front counterweight 33 is easy, the adjustment work of the rotation balance is easily performed. In addition, if the length of the front counterweight 33 is somewhat shorter than the circumferential length (arc length) of the storage recess 31, the replacement is easy.

  As described above, the rotary drum 11 is a cantilevered rotation support mechanism in which one end side (the bottom plate 111 and the bottom plate reinforcement base 17) in the rotation axis direction is supported by a rotary drum drive system including a drive motor. . Then, by providing the fluid balance ring 13 on the front side of the rotating drum 11 which is the opposite side of the support portion supported by the rotating support shaft 18 included in the rotating drum drive system, the rotation generated in the laundry unevenly distributed on the rotating drum 11. Unbalance vibrations are mitigated. The vibration of the rotational unbalance exhibits a swing vibration in which the front side of the rotating drum 11 having the fluid balance ring 13 has a large amplitude with the support portion as a fulcrum. Since the front counterweight 33 is provided on the fluid balance ring 13 placed on the front side of the rotating drum 11 where the amplitude of the swing vibration increases, the suppression of vibration due to rotational unbalance acts greatly, and the rotational unbalance of the rotating drum is effectively reduced. Can be adjusted.

  The rear counterweight will be described.

  As shown in FIGS. 3 to 7, the rear counterweight 200 is provided on the rear side of the rotating drum 11 (the side opposite to the fluid balance ring 13 provided on the front side). The drum tank 11a of the rotating drum includes a bottom plate 111 and a bottom plate reinforcing base 17 on the rear side.

  The bottom plate reinforcing base 17 has three support arms 170 extending radially from the center and a fastening boss 171 provided at the center. The drum tank 11 a is fastened and fixed to the outer peripheral end of the support arm 170 with screws 172. The rotary drum 11 is supported by the rotation support shaft 18 by fastening the rotation support shaft 18 to the fastening boss 171.

  The bottom plate 111 and the bottom plate reinforcing base 17 are flush with each other on the outer surface, which is the rear outer side when viewed from the inner side of the rotary drum 11.

  As described above, the drum tank 11a of the rotating drum has an annular fastening portion that fastens the body portion 110 formed of a steel plate containing stainless steel and the bottom plate 111 formed of a steel plate containing stainless steel, as shown in FIGS. 112. The rear counterweight 200 is attached and fixed to the annular fastening portion 112.

  The annular fastening part 112 is formed by helical folding caulking in which the rear end side of the bottom plate cylindrical part 113 and the body part 111 formed on the bottom plate 111 is folded back to the outer peripheral side of the outer body part 111. This helical fold caulking is formed so that an annular bulge 150 whose thickness is increased by overlapping the body portion and the steel plate of the bottom plate bulges on the outer periphery of the body portion 111.

  The helical fold caulking is performed by folding the body part 111 and the bottom plate cylindrical part 113 in contact with the inner periphery of the body part 111 to the outer peripheral side of the body part 111 in a sandwiching groove on the body part 111 side. This is a strong caulking fastening structure that is formed by being folded so as to sandwich the front end side.

  As shown in FIG. 5, the length L1 of the annular fastening portion 112 in the rotational axis direction is about 5 to 6 mm. The thickness T1 is about 3 mm. The body 111 and the bottom steel plate are 0.6 mm, and the overlap of the clad folds is five, so the thickness T1 is 3 mm. The length L2 from the outer surface which is the rear outer side of the bottom plate 111 and the bottom plate reinforcing base 17 to the tip of the annular fastening portion 112 is 10 mm.

  As shown in FIGS. 8 and 9, the rear counterweight 200 includes a U-shaped weight holding portion 201 that sandwiches the annular bulge 150 of the annular fastening portion 112 from the inner and outer circumferences, and one end of the weight holding portion 201. A weight extension 202 that extends long and a weight arm 203 that bends and extends at a right angle to the tip of the weight extension 202 are provided. Further, the rear counterweight 200 has a curved claw 204 at the other end of the weight holding part 201. The curved claw 204 is formed such that the front end of the weight holding portion 201 is bent inward, and the front end side of the holding port is narrowed.

The rear counterweight 200 is made of a steel plate including stainless steel having a thickness of 0.5 mm.
The length L3 is about 36 mm. The length L3 is a length along the circumferential direction of the annular fastening portion 112. The weight clamping unit 201 has a clamping port width of about 2.3 mm and an internal width of about 3 mm.

  The rear counterweight 200 pushes the clamping port of the weight clamping part 201 into alignment with the annular bulge 150 of the annular fastening part 112, so that the weight clamping part 201 clamps the annular bulge 150 and is held by the rotating drum. .

  Since the weight nipping portion 201 has a curved claw 204 (shown in FIGS. 6 and 7) that narrows the front end side of the nipping port engages with the outer corner of the annular bulge 150, The side counterweight 200 does not easily fall off the annular fastening portion 112. This holding is referred to as so-called temporary fixing, and the final counterweight 200 is firmly attached and fixed to the annular fastening portion 112 by performing the main fixing in this holding state.

  This locking is performed by clamping the weight nipping portion 201 from the outside to the annular bulge 150, or pushing the curved claw 204 inward from the outside to crimp the annular bulge 150. This final stop is a caulking machine. However, since the rear counterweight 200 is temporarily fixed to the annular fastening portion 112, no positional deviation occurs, and the rear counterweight 200 is placed at an accurate position for adjusting the rotation imbalance. Can be fixed.

  Since the rear counterweight 200 is provided in the annular fastening portion 112 positioned on the outer peripheral side of the rotary drum 11, the weight is smaller and smaller than in the case where a weight is provided between the center of rotation and the outer periphery shown in the conventional example. Can do.

  Further, since the rear counterweight 200 is attached and fixed by sandwiching the annular fastening portion 112 with the weight sandwiching portion 201, a fixing tool such as a screw is unnecessary and the number of components is small and easy to assemble.

  Further, the rear counterweight 200 sandwiches the annular fastening portion 112 with the weight clamping portion 201, the weight extension portion 202 is joined to the inner peripheral surface of the bottom plate cylindrical portion 113, and the weight arm portion 203 is attached to the bottom plate 111 or the bottom plate reinforcement base 17. It is attached in a state where it is joined to the outer side surface (the rear outer side as viewed from the inner side of the rotating drum 11). For this reason, the back counterweight 200 is a state in which the back counterweight 200 is attached to the outer surface of the bottom plate 111 or the bottom plate reinforcing base 17 and the inner peripheral surface of the bottom plate cylindrical portion 113 and has a small amount of protrusion, and the yarn that wraps around from the inside of the rotating drum 11 Debris and fine fiber entanglement are reduced.

  Further, the weight arm 203 has a chamfered portion 205 in which both corners of the tip are cut. By providing the chamfered portion 205, entanglement of lint and fine fibers is reduced.

  Furthermore, the rear counterweight 200 is a straight line over the range of the length L3. Since the weight holding part 201 is a straight line, it is easy to make. The circular arc diameter of the annular fastening portion 112 is 600 mm. Since the linear weight pinching portion 201 holds the circular arc region of the annular fastening portion 112, it is not uniformly pinched over the range of the length L3. The weight 200 is often held temporarily in the annular fastening portion 112. For this reason, the main stop by caulking is performed without causing a position shift.

  Further, a screw 172 (shown in FIGS. 5 and 6) for fixing the drum tank 11 a to the outer peripheral end of the support arm 170 is provided at a position avoiding the annular bulge 150 of the annular fastening portion 112. For this reason, when attaching the weight holding | maintenance part 201 to the cyclic | annular bulge 150, the weight holding | maintenance part 201 does not interfere with the screw 172 but interferes, and it is easy to assemble.

Furthermore, the rear counterweight 200 must be placed exactly at the position to be measured in the same way as the front counterweight. The manufactured rotating drum 11 is set on a rotating balance measuring machine as a single unit and unbalance is measured. When imbalance exists,
A place where the weight is unbalanced due to rotational imbalance and is light is specified somewhere within a range of 360 degrees around the rotational axis of the rotary drum 11.

  The rear counterweight 200 is attached and fixed to the specified annular fastening portion 112, and balance adjustment is performed. Since the rear counterweight 200 is attached using the annular fastening portion 112, it can be accurately placed at a position specified by measurement. In the washing machine shown in the conventional example, a weight is attached to the bottom intermediate portion of the washing and dewatering tub. Reinforcing support bones exist radially at this intermediate portion. In the washing machine having such a configuration, the balance weight is insufficient because the counterweight is placed avoiding the radial fulcrum.

  The rear counterweight 200 weighs about 5 grams. In contrast, the front counterweight 33 weighs about 30 grams and is six times heavier than the rear counterweight 200.

  This washing machine is cantilevered to support the rear side of the rotary drum 11. The front side and the rear side of the rotating drum 11 are different in distance from the fulcrum of the cantilever support. The moment of movement accompanying the rotation of the rotating drum 11 is large on the front side where the fluid balance ring 13 is located, and is small on the rear side near the fulcrum. The ratio of the kinetic moment is about 6: 1 between the front side and the rear side. For this reason, the front counterweight was heavy and the rear counterweight was light.

  Thus, the front counterweight 33 that adjusts the rotational balance of the rotating drum 11 on the front side of the rotating drum 11 is provided at the portion of the fluid balance ring 13 that is positioned at the lighter weight with the unbalanced rotational balance. A rear counterweight 200 for adjusting the rotational balance on the rear side of the rotary drum 11 is provided at a portion of the annular fastening portion 112 positioned on the lighter side due to the imbalance of the rotational balance, and the front counterweight 33 is heavier. The side counterweight 200 was lightened. Thereby, the unbalance of the rotating drum 11 which is a cantilever supporting the rear side of the rotating drum 11 is adjusted in the same manner on the front and rear sides, and a washing machine with less vibration due to unbalance can be provided.

  10, FIG. 11, FIG. 12, and FIG. 13 show other types of rear counterweights.

  The rear counterweight 300 has the same configuration as that of the rear counterweight 200 except that the rear counterweight 300 includes a foldable bellows portion 301 instead of the weight arm portion 203 of the rear counterweight 200 described above. Common parts are marked with common signs with the rear counterweight 200.

  The rear counterweight 300 is attached by sandwiching the annular bulge 150 of the annular fastening portion 112 with the weight sandwiching portion 201. Fixing by caulking is performed by pinching the weight holding part 201 and the bellows part 301 together. The rear counterweight 300 can be easily adjusted in weight by changing the number of folding of the bellows portion 301.

DESCRIPTION OF SYMBOLS 1 ... Outer frame 2 ... Outer tank 3 ... Suspension 4 ... Pulling spring 11 ... Rotating drum 13 ... Fluid balance ring 11a ... Drum tank 110 ... Cylindrical body part 111 ... Bottom plate 112 ... Annular fastening part 200 ... Rear counterweight

Claims (8)

A rotating drum for washing laundry,
An outer tub for storing washing water and placing the rotating drum therein;
The rotary drum includes a drive motor that includes a drive motor that supports the rear end side, which is one end side in the rotation axis direction, to be cantilevered;
An outer frame for placing the outer tub,
Provided with an anti-vibration mechanism for anti-vibration support of the outer tub on the outer frame,
The rotating drum has a drum tub into which the laundry enters,
The drum tank includes a cylindrical body portion formed of a steel plate including stainless steel, a bottom plate formed of a steel plate including stainless steel that covers the rear end side of the body portion, an outer peripheral side of the bottom plate, and the body portion. Having an annular fastening portion that fastens the rear end side of the body portion over the entire circumference,
A counterweight for adjusting the rotational balance of the rotating drum is provided at a portion of the annular fastening portion that is positioned on the lighter side of the rotational balance and having a light weight. The washing machine according to claim 1, wherein
The annular fastening portion is formed by helical folding caulking, with the outer peripheral end side of the bottom plate being sandwiched and folded into a clamping groove formed by folding the rear end side of the body portion outward. And having an annular bulge that increases in thickness and swells to the outer peripheral side of the body part,
The counterweight formed of a steel plate containing stainless steel has a U-shaped weight clamping portion that sandwiches the annular bulge from the inner and outer peripheral sides,
A washing machine characterized in that the counterweight is fixed to the annular fastening portion by crimping the weight holding portion sandwiched between the annular bulges. The washing machine according to claim 2,
2. The washing machine according to claim 1, wherein the counterweight is bent from one end side of the U-shaped weight holding portion and has a weight arm portion that comes into contact with an outer side surface of the bottom plate (a side surface opposite to the inner side of the rotating drum). The washing machine according to claim 2,
The counterweight has a curved claw in which the tip end of the weight holding portion bends inward and narrows the tip end side of the holding port, and the curved claw engages with the outer surface corner edge of the annular bulge. A washing machine characterized by that. The washing machine according to claim 3,
The bottom plate has a bottom plate cylindrical portion that extends toward a rear outer side (a rear outer side when viewed from the inside of the rotating drum) on an outer periphery of the bottom plate and contacts an inner peripheral surface of the body portion,
The clamping portion of the counterweight has a weight extension portion that is elongated on one side, the weight arm portion is bent at the front side of the extension portion, and the weight extension portion contacts the inner peripheral surface of the bottom plate cylindrical portion. Washing machine characterized by touching A rotating drum for washing laundry,
An outer tub for storing washing water and placing the rotating drum therein;
The rotary drum includes a drive motor that includes a drive motor that supports the rear end side, which is one end side in the rotation axis direction, to be cantilevered;
An outer frame for placing the outer tub,
Provided with an anti-vibration mechanism for anti-vibration support of the outer tub on the outer frame,
The rotating drum has a drum tub into which the laundry enters and a fluid balance ring provided on a front end side opposite to the rear end side,
The drum tank includes a cylindrical body portion formed of a steel plate including stainless steel, a bottom plate formed of a steel plate including stainless steel that covers the rear end side of the body portion, an outer peripheral side of the bottom plate, and the body portion. Having an annular fastening portion that fastens the rear end side of the body portion over the entire circumference,
A front counterweight that adjusts the rotational balance of the rotating drum on the front side of the rotating drum is provided at a portion of the fluid balance ring that is positioned on the lighter side of the rotating balance and unbalanced.
A rear counterweight for adjusting the rotational balance of the rotating drum on the rear side of the rotating drum is provided at a portion of the annular fastening portion located on the lighter side of the rotating balance and having a light weight. . The washing machine according to claim 6,
The washing machine according to claim 1, wherein the weight of the front counterweight is about 2 to 7 times heavier than the rear counterweight. In a method for adjusting the rotational balance of a rotating drum provided in a washing machine,
The rotating drum has a drum tub into which laundry enters and a fluid balance ring provided on the front end side of the drum tub.
The drum tank is a cylindrical body portion formed of a steel plate containing stainless steel, and a bottom plate formed of a steel plate containing stainless steel that closes the rear end side of the body portion (opposite side of the fluid balance ring), An annular fastening portion for fastening the outer peripheral side of the bottom plate and the rear end side of the trunk portion over the entire circumference of the trunk portion;
Rotational balance measuring machine measures the rotational balance of the front and rear of the rotating drum,
A front counterweight is attached and fixed to a portion of the fluid balance ring that is positioned on the lighter weight with the imbalance of the rotation balance,
A rear counterweight is attached and fixed to a portion of the annular fastening portion located on the lighter weight with the imbalance of the rotation balance,
The method for adjusting the rotational balance of a rotary drum provided in a washing machine, wherein the measurement by the rotational balance measuring machine and the attachment and fixing of the front and rear counterweights are a single rotary drum before the rotary drum is incorporated into the washing machine.

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