WO2024089938A1 - Drum washing machine - Google Patents

Drum washing machine Download PDF

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Publication number
WO2024089938A1
WO2024089938A1 PCT/JP2023/023895 JP2023023895W WO2024089938A1 WO 2024089938 A1 WO2024089938 A1 WO 2024089938A1 JP 2023023895 W JP2023023895 W JP 2023023895W WO 2024089938 A1 WO2024089938 A1 WO 2024089938A1
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WIPO (PCT)
Prior art keywords
outer tub
vibration damper
housing
vibration
tub
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PCT/JP2023/023895
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French (fr)
Japanese (ja)
Inventor
瀛申 傅
優 金内
真 井村
真理 黒澤
康博 松井
昌 坂東
Original Assignee
日立グローバルライフソリューションズ株式会社
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Application filed by 日立グローバルライフソリューションズ株式会社 filed Critical 日立グローバルライフソリューションズ株式会社
Publication of WO2024089938A1 publication Critical patent/WO2024089938A1/en

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis

Definitions

  • the present invention relates to a washing machine that washes clothes, and in particular to a drum-type washing machine with a horizontally positioned washing tub.
  • a drum-type washing machine is composed of an outer tub that holds water, a rotating drum that acts as a rotatable washing tub contained within the outer tub, and a housing that contains the outer tub and the rotating drum, and the outer tub is supported by vibration-proof structures such as vibration dampers and hanging springs from the housing.
  • the rotating drum is rotated at high speed to spin the clothes using centrifugal force, so if the distribution of clothes inside the rotating drum is uneven, vibrations will occur in the outer tub.
  • vibration dampers and suspension springs are used to suppress vibration of the outer tub.
  • vibration dampers that suppress vibration of the outer tub include those described in JP 2015-53947 A (Patent Document 1) and JP 5-84389 A (Patent Document 2).
  • the drum-type washing machine in Patent Document 1 comprises a first vibration damper disposed on the side in the direction in which the drum rotates, closer to the front than the center of gravity of the tub unit, and a second vibration damper disposed on the rear than the center of gravity of the tub unit, and the housing connection part to which the first and second vibration dampers are connected is attached to the washing machine housing via third cushioning material A and third cushioning material B.
  • the first and second vibration dampers, and third cushioning material A and third cushioning material B can also dampen vibrations of the tub unit in the front-back and left-right directions.
  • the drum-type washing machine in Patent Document 2 has a suspended water tub and a drum that rotates within the water tub, and is equipped with a pair of dampers that are installed between the bottom of the water tub and the washing machine body at an angle ⁇ between them and are inclined in the front-to-rear direction.
  • the pair of dampers also generate a damping force in the front-to-rear direction, suppressing vibration of the water tub.
  • vibration damper By increasing the damping performance of the vibration isolation mechanism (so-called vibration damper) that connects the outer tub to the housing, it is possible to suppress vibration of the outer tub at the rotation speed range where the outer tub resonates.
  • vibration isolation mechanism with high damping performance, the vibration of the outer tub is transmitted to the housing during high-speed rotation, causing the housing and the floor on which the drum washing machine is placed to vibrate. Since the vibration of the housing and the vibration of the floor on which the washing machine is placed can lead to discomfort for the user, it is necessary to simultaneously suppress the vibration of the outer tub and the vibration of the housing and the floor on which the washing machine is placed.
  • Patent Document 1 multiple vibration dampers are provided under the outer tub, and cushioning material is provided at the connection between the vibration dampers and the housing, suppressing vibration of the outer tub in the left-right, up-down, and front-back directions when viewed from the front of the washing machine.
  • the vibration damper is installed in a position that attenuates vibrations in the left-right and up-down directions of the outer tank, while vibrations in the front-back direction are mainly suppressed by the damping of the cushioning material.
  • This requires cushioning material with high damping performance, which may increase the vibrations transmitted to the housing and installation floor during high-speed rotation.
  • Patent Document 2 there are multiple vibration dampers attached to the bottom of the outer tub at an angle in the front-to-rear direction, and vibration in the outer tub is suppressed by damping the vibration in the front-to-rear direction.
  • the vibration dampers since the front-to-rear vibration mode during resonance of the outer tub is not taken into consideration, even if large vibration in the front-to-rear direction occurs due to the swinging movement of the outer tub, the vibration dampers cannot stroke widely, and conversely, there is a risk that a vibration damper with low damping performance cannot sufficiently dampen the vibration. Therefore, in order to suppress vibration in the front-to-rear direction, it is necessary to use a vibration damper with high damping performance, which, like Patent Document 1, may result in an increase in vibration transmitted to the housing and installation floor during high-speed rotation.
  • the object of the present invention is to provide a drum-type washing machine that can suppress vibrations in the front-to-rear direction of the outer tub and suppress an increase in vibrations transmitted to the housing and installation floor.
  • the present invention provides a drum-type washing machine including a housing, an outer tub supported within the housing and capable of storing wash water therein, a rotary drum contained within the outer tub and rotated by an electric motor, and a plurality of vibration dampers connecting a lower portion of the outer tub to a bottom of the housing,
  • a dividing line is imaginarily set in the direction of gravity passing through the center of the clothes insertion opening, at least one of the plurality of vibration dampers is
  • the rotating drum rotates counterclockwise during the dehydration operation, the drum is installed in the area to the left of the dividing line, and when the rotating drum rotates clockwise during the dehydration operation, the drum is installed in the area to the right of the dividing line.
  • the outer tub side mounting portion between one vibration damper and the outer tub is positioned closer to the clothing insertion opening when viewed in the axial direction of the outer tub
  • the housing side mounting portion between one vibration damper and the housing is positioned farther from the clothing insertion opening than the outer tub side mounting portion when viewed in the axial direction of the outer tub.
  • FIG. 1 is a perspective view of a drum-type washing machine to which the present invention is applied;
  • FIG. 2 is a cross-sectional view showing a vertical cross section illustrating an internal configuration of the drum type washing machine.
  • FIG. 4 is a chart showing a control pattern of the rotation speed of the rotating drum during a dehydration process.
  • 10A and 10B are explanatory diagrams illustrating changes in vibration phase in each vibration direction of the outer tank.
  • 11 is an explanatory diagram illustrating a vibration trajectory as viewed from the side of the clothes insertion opening of the outer tub.
  • FIG. FIG. 11 is an explanatory diagram illustrating the swinging motion of the outer tub.
  • FIG. 1 is a configuration diagram showing the outer tub as viewed from the front, illustrating the positional relationship between the outer tub, the housing, and the vibration damper according to an embodiment of the present invention.
  • FIG. 1 is a configuration diagram seen from the side of the outer tank to explain the positional relationship between the outer tank, the housing, and the vibration damper according to an embodiment of the present invention.
  • FIG. 4A to 4C are explanatory diagrams for explaining a first behavior of the vibration damper in the present embodiment.
  • 10 is an explanatory diagram for explaining a second behavior of the vibration damper in the present embodiment.
  • FIG. 1 is a perspective view of a drum-type washing machine 100 to which the present invention is applied
  • FIG. 2 is a side view showing the internal structure of the drum-type washing machine 100. Below, the general configuration and operation of the drum-type washing machine 100 will be explained using FIG. 1 and FIG. 2.
  • the housing 1 that constitutes the outer shell of the drum-type washing machine 100 shown in FIG. 1 is attached to a housing base 1a and is composed of left and right side panels 1b (only the right side panel is shown in FIG. 1), a front cover 1c, a rear cover 1d (see FIG. 2), a top cover 1e, and a lower front cover 1f.
  • the top cover 1e is provided with a water supply hose connection port 30 for supplying water from a water tap to the drum-type washing machine 100.
  • the door 2 is used to cover a clothing insertion opening (not shown) located approximately in the center of the front cover 1c for inserting and removing clothing, and is supported so as to be openable and closable by a hinge (not shown) provided on the front cover 1c.
  • the door 2 is opened by pulling the door opening handle 2a towards the user, which releases a locking mechanism (not shown), and is closed by pressing the door 2 against the front cover 1c.
  • the front cover 1c has a circular clothing insertion opening for inserting and removing clothing, approximately concentric with the clothing insertion opening of the outer tub 11 described below.
  • the operation and display panel 3 provided on the top of the housing 1 includes a power switch 4, an operation switch 5, and a display 6.
  • the operation and display panel 3 is electrically connected to a control unit 7 (see FIG. 2) provided on an upper reinforcing member 13 (see FIG. 2) provided on the top of the housing 1.
  • a cooling fan (not shown) is attached to the control unit 7.
  • the control unit 7 also includes a memory capable of recording the operation of the drum washing machine.
  • a drain hose 14 for draining water is attached near the housing base 1a.
  • the housing 1 of the drum-type washing machine 100 shown in FIG. 2 is provided with an outer tub 11 for storing water.
  • the upper part of the outer tub 11 is connected by two sets of suspension means 8 consisting of coil springs in order to maintain the position of the outer tub 11.
  • the lower part of the outer tub 11 is connected by a number of vibration dampers 24a-24d attached to the housing 1.
  • the connection parts between both ends of the vibration dampers 24a-24d and the outer tub 11 and housing 1 are attached in a state where they can swing in the vibration direction of the outer tub 11.
  • the number of vibration dampers 24 may be two or more, and the configuration is not limited. In this embodiment, there are four, as described above. Note that this embodiment is characterized by the arrangement of vibration dampers 24d, which are provided in a position closer to the door 2 side of the outer tub 11, when the door 2 side is the front. This will be explained using Figures 7A and 7B.
  • the outer tub 11 contains a rotating drum 21 for washing clothes.
  • An electric motor 22 for rotating the rotating drum 21 is provided at the rear of the outer tub 11.
  • the electric motor 22 has a shaft 22a that serves as the rotation axis, which passes through the outer tub 11 and is mechanically connected to the rotating drum 21.
  • the rotating drum 21 is driven to rotate in both forward (counterclockwise when viewed from the front of the door 2 of the drum type washing machine 100) and reverse (clockwise when viewed from the front of the door of the drum type washing machine 100).
  • the rotation axis Az of the rotating drum 21 shown in FIG. 2 is horizontal from the front to the rear on the door 2 side of the drum-type washing machine 100, or is inclined so that the rear side is downwards (FIG. 2 shows the rear side inclined so that the rear side is downwards).
  • the electric motor 21 is provided with a rotation speed detection device 10 that detects the rotation speed.
  • the inner circumferential surface of the rotating drum 21 is provided with a number of dewatering holes 21b for draining the washing water in the rotating drum 21 into the outer tub 11, and a number of baffles 23 (only one is shown in FIG. 2) spaced apart around the circumference of the rotating drum 21 for lifting clothes placed in the rotating drum 21.
  • the baffles 23 extend in the front-to-rear direction of the rotating drum 21.
  • a cylindrical fluid balancer 21c is provided at the front end (door 2 side) of the rotating drum 21.
  • the outer tub 11 is roughly cylindrical with an opening at the front and a closed rear, and has a bottom.
  • the clothes insertion opening of the outer tub 11 and the clothes insertion opening of the housing 1 are connected by a bellows 16 that easily expands and contracts in the front-to-rear direction.
  • the bellows 16 is an annular packing that seals the rotating drum 21 against water when the door 2 is closed.
  • the clothing insertion opening of the housing 1, the clothing insertion opening of the outer tub 11, and the clothing insertion opening of the rotating drum 21 are all connected to each other, and opening the door 2 makes it possible to put clothes in and take them out of the rotating drum 21.
  • the outer tub 11 can also be divided into a side that includes the clothing insertion opening and a side where the electric motor 22 is attached.
  • the drain port 19 provided at the bottom of the outer tub 11 is connected to the internal drain hose 14.
  • the lint collection box 17 is provided with a circulation pump 20 for circulating the wash water, and the wash water is sprayed into the rotating drum 21 via a circulation path 20a.
  • the external drain hose 15 is provided with a drain valve 15a, and water is stored in the outer tub 11 by closing the drain valve 15a and supplying water, and the water in the outer tub 11 is discharged outside the machine by opening the drain valve 15a.
  • the lower part of the outer tub 11 is provided with an outer tub vibration detection unit 18 that detects the vibration of the outer tub 11.
  • the vibration of the outer tub 11 exceeds a preset threshold, the rotation of the rotating drum 21 is temporarily stopped, the clothes are corrected, and the spin-drying process is restarted. Only when the vibration is below the threshold is the rotation speed of the rotating drum 21 increased to prevent excessive vibration.
  • the operation of the drum type washing machine 100 configured as above will be described.
  • the user first presses the power switch 4, which starts the drum type washing machine 100.
  • the user pulls the door opening handle 2a to open the door 2 and place the clothes into the rotating drum 21. After closing the door 2, the user operates the operation switch 5 to start operation.
  • the rotating drum 21 rotates to calculate the laundry volume before water is poured in.
  • the laundry volume is calculated based on the rotation speed and current value of the electric motor 22.
  • the greater the laundry volume the greater the load on the electric motor 22, and therefore the greater the current value, so the laundry volume is determined from the current value.
  • the amount of detergent to be added is displayed on the display 6 based on the laundry volume.
  • the greater the calculated laundry volume the greater the amount of detergent to be added.
  • the water supply valve 32 is opened, and water supplied from the water supply hose connection port 30 is supplied into the outer tub 11 together with detergent via the internal water supply hose 31 and detergent container 12.
  • the greater the calculated volume of clothes the greater the amount of water supplied in the washing process.
  • undissolved detergent and water are agitated in the circulation pump 20. This efficiently dissolves the detergent and produces a highly concentrated detergent solution.
  • a washing operation is performed for a predetermined time in which the rotating drum 21 is rotated forward, stopped, reversed, and stopped repeatedly. At this time, the clothes are lifted by the baffle 23 and dropped repeatedly, thereby washing the clothes.
  • FIG. 3 shows the control pattern of the rotation speed of the rotating drum 21 in the spin-drying process.
  • the rotation speed of the rotating drum 21 is increased to the target rotation speed range (t5-t6) while passing through a low rotation speed range (t1-t2) in which the clothes are spread and attached to the inner surface of the rotating drum 21, a resonance range (t2-t3) of the outer tub 11, a resonance range (t3-t4) of the housing 1, and a post-resonance range (t4-t5) of the housing 1, thereby centrifugally spinning off the moisture contained in the clothes.
  • the rotation speed of the rotating drum 21 is increased to ⁇ 0 (e.g., 50 r/min). At this time, clothes that have absorbed moisture during the washing process are lifted by the baffle 23 as the rotating drum 21 rotates, and as the clothes fall, they are spread out on the inner circumferential surface of the rotating drum 21.
  • ⁇ 0 e.g., 50 r/min
  • the rotating drum 21 is operated at ⁇ 0 for a time T1 (e.g., 10 seconds) in order to detect the uneven distribution of the clothes at ⁇ 0 .
  • Detection of uneven distribution of clothes in the low rotation speed range is determined based on the magnitude of rotation fluctuation.
  • the rotation fluctuation is calculated, for example, from the difference between the speed at which clothes are lifted from the bottom of the rotating drum 21 to the top (minimum speed) and the speed at which clothes are lowered from the top of the rotating drum 21 to the bottom (maximum speed) when the rotating drum 21 makes one rotation.
  • the smaller the rotation fluctuation the less uneven distribution of clothes can be confirmed.
  • the rotation speed of the rotating drum 21 is increased from ⁇ 0 to ⁇ 1 (e.g., 80 r/min).
  • ⁇ 0 and ⁇ 1 are rotation speeds for detecting the degree of adhesion of the clothes, with ⁇ 0 being the rotation speed at which the clothes start to adhere to the inner circumferential surface of the rotating drum 21 and ⁇ 1 being the rotation speed at which the clothes completely adhere to the inner circumferential surface of the rotating drum 21.
  • the rotation speed of the rotating drum 21 is increased to ⁇ 2 (e.g., 400 r/min) to pass through the resonance zone of the outer tub 11. If the vibration amplitude of the outer tub 11 is smaller than a predetermined value when passing through the resonance zone of the outer tub 11, the rotation speed of the rotating drum 21 is increased to ⁇ 3 (e.g., 600 r/min) to pass through the resonance zone of the housing 1.
  • the rotation speed of the rotating drum 21 is increased to a target (e.g., 900 r/min).
  • a target e.g., 900 r/min
  • the rotating drum 21 is operated for a predetermined time at T3 (e.g., 180 seconds), and then the rotation speed of the rotating drum 21 is decreased to 0 r/min (t6 to t7) to end the dehydration process.
  • the rinsing cycle is performed.
  • the water supply valve 32 is opened and tap water supplied from the water supply hose connection port 30 is supplied into the outer tub 11 via the water supply hose 31 and detergent container 12.
  • the greater the calculated laundry volume the greater the amount of water supplied.
  • the rotating drum 21 repeatedly rotates forward, stops, reverses, and stops. At this time, an agitation operation is performed for a predetermined period of time, in which the clothes lifted by the baffle 23 fall.
  • the operating time in the target rotation speed range for this final spin-drying process is set longer than that for the spin-drying process (e.g., 300 seconds).
  • Figure 4 shows the changes in the rotation speed of the rotating drum 21 and the vibration phase in each direction (up and down, left and right, front and back) in the resonance range of the outer tub (e.g., 100 r/min to 400 r/min).
  • vertical vibration means vibration in the direction of gravity in a plan view with the door 2 facing forward when the drum washing machine is installed on the installation floor of a house
  • left-right vibration means vibration in a direction perpendicular to the direction of gravity in a plan view with the door 2 facing forward
  • front-rear vibration means vibration in the direction in which the rotation axis Az (see Figure 2) of the rotating drum 21 extends, and also in the direction around the center of gravity.
  • the reference for the vibration phase is "0°" when the clothes are biased to the far right of the outer tub 11 (the right part that intersects with the X-X dividing line in Figure 5).
  • Figure 5 shows the vibration trajectory when the outer tub 11 is viewed from the front (clothing opening side) when a resonant mode of vibration in the front-to-rear direction occurs
  • Figure 6 shows the vibration trajectory when the outer tub 11 is viewed obliquely.
  • the clothing opening 11op is virtually divided into four areas, the "upper right area”, “lower right area”, “upper left area”, and “lower left area”, by a Y-Y dividing line in the vertical direction (gravity direction) that passes through the center C of the clothing opening 11op, and an X-X dividing line that is perpendicular to this and passes through the center C in the horizontal direction.
  • the clothing opening 11op is shown without showing related parts such as the bellows 16.
  • the phase difference between the left-to-right and up-to-down vibration phases of the outer tub 11 is significantly smaller than 90°; for example, in Figure 4, the phase difference is approximately 25°. Therefore, when the rotating drum 21 performs a spin-dry operation in the forward direction (left rotation), the outer tub 11 vibrates along an elliptical vibration locus that slopes upward to the right, spanning from the lower left region to the upper right region when viewed from the front of the clothing insertion opening 11op of the outer tub 11.
  • the upper right and lower left areas of the outer tub 11 were subjected to large swinging vibrations.
  • the upper right part of the upper right region and the lower left part of the lower left region at the front end side (the side where the clothes insertion opening 11op is formed) of the outer tub 11 oscillate widely back and forth, as shown in Fig. 6.
  • the rotating drum 21 performs a spin-drying operation in the reverse direction (clockwise rotation)
  • the upper left part of the upper left region and the lower right part of the lower right region at the front end side of the outer tub 11 oscillate widely.
  • this embodiment proposes a vibration damper arrangement that suppresses this swaying vibration.
  • a friction damper is used as the vibration damper
  • an oil damper filled with oil may also be used, and various other dampers may also be used as required.
  • Figures 7A and 7B show the arrangement of vibration dampers 24 (four dampers used) that suppress vertical and horizontal vibrations, including swaying vibrations, of the outer tub 11.
  • Figure 7A shows the configuration as seen from the side of the clothes insertion opening 11op on the front of the outer tub 11
  • Figure 7B shows the configuration as seen from the side of the outer tub 11.
  • Figure 7A shows the Y-Y dividing line in the vertical direction and the X-X dividing line perpendicular to this in the horizontal direction, just like Figure 5. Note that the following will explain the case where the rotating drum 21 is rotated in the forward direction.
  • two vibration dampers 24a, 24b are provided in the front-to-rear direction of the outer tub 11 along the axis of the outer tub 11 (corresponding to the rotation axis Az) in the lower right part of the lower right region of the outer tub 11.
  • the outer tub 11 can be divided into a front region and a rear region in the axial direction, with the center line Cc of the outer tub 11 shown in Figure 7B as the boundary.
  • the right front vibration damper 24a is attached to the front region of the outer tub 11, and similarly the right rear vibration damper 24b is attached to the rear region of the outer tub 11.
  • the vibration dampers 24a, 24b are attached in the same manner to the attachment parts (outer tank side attachment parts) 11a, 11b of the vibration dampers 24a, 24b to the outer tank 11, and to the attachment parts (casing side attachment parts) 1a, 1b of the vibration dampers 24a, 24b to the housing 1.
  • the vibration dampers 24a, 24b are attached in a state where they can oscillate mainly in response to vibrations in the left-right and up-down directions.
  • the mounting parts 11a, 11b of the outer tub 11 and the mounting parts 1a, 1b of the housing 1 are provided with a pair of flanges extending in a direction perpendicular to the axis of the outer tub 11, which sandwich both ends of the vibration dampers 24a, 24b. Both ends of the vibration dampers 24a, 24b are sandwiched between the pair of flanges and fixed in place by inserting bolts.
  • the vibration dampers 24a, 24b swing about the bolt in response to vibrations on a plane perpendicular to the axis of the outer tub 11.
  • the mounting angle of the right front vibration damper 24a relative to the horizontal is " ⁇ a”
  • the mounting angle of the right rear vibration damper 24b is " ⁇ b”
  • These mounting angles are appropriately selected depending on the direction and magnitude of the vibrations, mainly in the left-right and up-down directions.
  • two vibration dampers 24c, 24d are provided in the front-rear direction along the axis of the outer tub 11 (corresponding to the rotation axis Az) in the lower left part of the lower left region of the outer tub 11.
  • the left rear vibration damper 24c is attached to the rear region of the outer tub 11
  • the left front vibration damper 24d is attached to the front region of the outer tub 11, with the center line Cc of the outer tub 11 as the boundary in the axial direction.
  • the mounting portion (outer tank side mounting portion) 11c of the left rear vibration damper 24c to the outer tank 11 and the mounting portion (casing side mounting portion) 1c of the left rear vibration damper 24c to the housing 1 are attached in the same manner as the vibration dampers 24a and 24b described above.
  • the left rear vibration damper 24c is attached in a state where it can oscillate mainly in response to vibrations in the left-right and up-down directions.
  • the mounting part 11c of the outer tub 11 and the mounting part 1c of the housing 1 are provided with a pair of flanges extending in a direction perpendicular to the axis of the outer tub 11, which sandwich both ends of the vibration damper 24c. Both ends of the left rear vibration damper 24c are sandwiched between the pair of flanges and fixed in place by inserting bolts.
  • the vibration damper 24c This allows the vibration damper 24c to swing around the bolt in response to vibrations on a plane perpendicular to the axis of the outer tub 11.
  • the mounting angle of the left rear vibration damper 24c is " ⁇ c", and is set to a relationship of " ⁇ a ⁇ ⁇ b ⁇ ⁇ c". These angles are appropriately selected depending on the direction and magnitude of the vibrations, mainly in the left-right and up-down directions.
  • the left front vibration damper 24d is attached with its mounting direction rotated 90° relative to the left rear vibration damper 24c.
  • the mounting portion (outer tub side mounting portion) 11d of the left front vibration damper 24d to the outer tub 11 and the mounting portion (casing side mounting portion) 1d of the left front vibration damper 24d to the housing 1 are attached in a state rotated 90° relative to the mounting portions 11a-11c on the outer tub 11 side of the vibration dampers 24a-24c described above, and the mounting portions 1a-1c on the housing 1 side.
  • the left front vibration damper 24d is attached in a state where it can swing mainly in response to swinging vibrations in the front-to-rear direction.
  • the mounting part 11d of the outer tub 11 and the mounting part 1d of the housing 1 are provided with a pair of flanges extending in the axial direction of the outer tub 11 that sandwich both ends of the vibration damper 24d. Both ends of the vibration damper 24d are sandwiched between the pair of flanges and fixed by inserting a bolt. This allows the left front vibration damper 24d to swing around the bolt in response to the swaying vibration on a plane along the axis of the outer tub 11.
  • the mounting portion 11d on the outer tub 11 side and the mounting portion 1d on the housing 1 side are positioned as follows. As shown in FIG. 7B, the mounting portion 11d of the outer tub 11 is positioned closer to the clothing insertion opening 11op in the front area of the outer tub 11, and the mounting portion 1d of the housing 1 is positioned farther away from the clothing insertion opening 11op of the outer tub 11 than the mounting portion 11d. At this time, the mounting angle of the left front vibration damper 24d is " ⁇ d", and this angle is appropriately selected depending on the direction and magnitude of the vibration in the front-rear direction.
  • the left front vibration damper 24d which is inclined in the forward/rearward direction along the axis of the outer tub 11, can provide sufficient damping force to the swinging motion of the outer tub 11 and suppress forward/rearward vibration by being placed at the lower left rather than the lower right of the outer tub 11.
  • the resonance range of the housing 1 e.g., 450 r/min
  • the vibration of the outer tub 11 tends to converge to a constant value regardless of the arrangement of the vibration dampers 24a to 24d.
  • the vibration transmitted from the outer tub 11 to the installation floor depends on the damping performance of the vibration dampers 24a to 24d24, and converges to the same value regardless of the arrangement of the vibration dampers 24a to 24d.
  • vibrations in the front-back direction as well as the up-down and left-right directions of the outer tank 11 can be effectively suppressed, and vibrations transmitted to the installation floor can also be effectively suppressed.
  • the positioning of the left front vibration damper 24d, which is inclined in the front-rear direction along the axis of the outer tub 11, will be described.
  • the center of gravity 11g is described as being located at the rear of the center line Cc of the outer tub 11.
  • the electric motor 22 is located on the opposite side of the clothes insertion opening 11op of the outer tub 11, as shown in FIG. 2.
  • the oscillating vibration of the outer tub 11 is greater at positions farther away from the center of gravity 11g (closer to the clothing insertion opening), so the oscillating vibration is greater at the front than at the rear of the outer tub 11. Furthermore, when the clothes are biased towards the front of the rotating drum 21 (closer to the clothing insertion opening), the moment arm with respect to the center of rotation of the oscillating vibration is larger and the oscillating vibration is greater than when the clothes are biased towards the rear (closer to the electric motor) under the same conditions, so it is better to attach the attachment part 11d to the outer tub 11 at the front (closer to the clothing insertion opening).
  • Figures 8A and 8B show the relative positions of the outer tub 11 and the left front vibration damper 24d. We will explain the cases where the attachment part 11d is closer to the clothes insertion opening 11op relative to the center of gravity 11g of the outer tub 11, the cases where the attachment part 11d is closer to the center of gravity 11g of the outer tub 11, and the cases where it is located nearby.
  • the stroke dx of the left front vibration damper 24d increases according to the magnitude of the oscillating vibration of the outer tub 11, and the damping performance is exerted, so that the oscillating vibration of the outer tub 11 can be effectively suppressed.
  • the mounting portion 11d of the left front vibration damper 24d can be more effectively suppressed by locating it as close as possible to the clothing insertion opening 11op.
  • the mounting portion 11d of the left front vibration damper 24d is located between near the center of the front area of the outer tub 11 and the clothing insertion opening 11op of the outer tub 11, but most preferably at the clothing insertion opening 11op.
  • the left front vibration damper 24d is attached so that the mounting part 11d of the outer tub 11 is at the rear side of the outer tub 11 and the mounting part 1d of the housing 1 is at the front side of the outer tub 11, the left front vibration damper 24d will rotate mainly around the mounting connection part 11d, making it difficult to apply damping force to the oscillating movement. Therefore, it is preferable to attach the left front vibration damper 24d so that the mounting part 11d of the outer tub 11 is at the front side and the mounting part 1d of the housing 1 is at the rear side, as shown in Figures 8A and 8B.
  • the center of gravity 11g of the outer tub 11 may be located in front of the center line Cc of the outer tub 11.
  • the left front vibration damper 24d shown in FIG. 7B is replaced with the left rear vibration damper 24c, and the left rear vibration damper 24c is replaced with the left front vibration damper 24d.
  • the inclination direction of the left front vibration damper 24d is also reversed.
  • the vibration dampers 24a to 24c are installed with inclinations at angles ⁇ a to ⁇ c in the left-right direction (the horizontal plane is 0°), which makes it possible to suppress vibrations caused by resonance mainly in the left-right and up-down directions.
  • Anti-vibration damper 24c is provided on the left side of outer tub 11, and anti-vibration dampers 24a and 24b are provided on the right side, and are configured to support outer tub 11. As mentioned above, the lower left region of outer tub 11 vibrates more than the lower right region, so it is desirable to make the damping force of anti-vibration damper 24 stronger on the lower left side than on the lower right side.
  • the above-described arrangement of the vibration dampers 24 is an example and should not be considered limiting.
  • the front left vibration damper 24d inclined in the front-to-rear direction may be provided with multiple vibration dampers 24d rather than a single one.
  • the rear left vibration damper 24c may also be installed with an incline in the front-to-rear direction to increase the damping force of vibration in the front-to-rear direction, resulting in a configuration that further suppresses swaying vibration.
  • the present invention is not limited to the above-mentioned embodiments, but includes various modified examples.
  • the above-mentioned embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described.
  • it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.

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  • Textile Engineering (AREA)
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Abstract

Provided is a drum washing machine with which it is possible to minimize any longitudinal vibrations of an outer tub, and to minimize any increase in vibrations transmitted to a housing and an installation floor. In a plan view of a clothing loading opening 11op of an outer tub 11 from the front, when a Y-Y dividing line is virtually set in the direction of gravity passing through the center of the clothing loading opening, at least one anti-vibration damper 24d of a plurality of anti-vibration dampers 24 is installed in the area to the left of the dividing line when the rotation direction of a rotating drum 21 during water-draining operation is counterclockwise, and the one anti-vibration damper 24d is installed in the area to the right of the dividing line when the rotation direction of the rotating drum during water-draining operation is clockwise. Furthermore, an outer-tub-side attachment part 11d of the one anti-vibration damper 24d and the outer tub 11 is disposed closer to the clothing loading opening when viewed in the axial direction of the outer tub, and a housing-side attachment part 1d of the one anti-vibration damper 24d and the housing is disposed further from the clothing loading opening 11op than the outer-tub-side attachment part 11d when viewed in the axial direction of the outer tub 11.

Description

ドラム式洗濯機Drum washing machine
　本発明は衣類を洗濯する洗濯機係り、特に洗濯槽が横向に配置されたドラム式洗濯機に関するものである。 The present invention relates to a washing machine that washes clothes, and in particular to a drum-type washing machine with a horizontally positioned washing tub.
　一般的にドラム式洗濯機は、水を溜める外槽と、外槽に内包され回転可能な洗濯槽としての回転ドラムと、外槽と回転ドラムを内包する筐体で構成され、外槽は筐体から防振ダンパや吊りばね等の防振構造によって支持されている。衣類の脱水運転時には、回転ドラムを高速回転させて遠心力により脱水を行うため、回転ドラム内の衣類の分布に偏りが生じると外槽に振動が発生する。 Generally, a drum-type washing machine is composed of an outer tub that holds water, a rotating drum that acts as a rotatable washing tub contained within the outer tub, and a housing that contains the outer tub and the rotating drum, and the outer tub is supported by vibration-proof structures such as vibration dampers and hanging springs from the housing. During the clothes spin cycle, the rotating drum is rotated at high speed to spin the clothes using centrifugal force, so if the distribution of clothes inside the rotating drum is uneven, vibrations will occur in the outer tub.
　このため、防振ダンパや吊りばねによって外槽の振動を抑制するようにしている。外槽の振動を抑制する防振ダンパの例として、例えば特開２０１５―５３９４７号公報（特許文献１）や特開平５―８４３８９号公報（特許文献２）に記載の防振ダンパが知られている。 For this reason, vibration dampers and suspension springs are used to suppress vibration of the outer tub. Examples of vibration dampers that suppress vibration of the outer tub include those described in JP 2015-53947 A (Patent Document 1) and JP 5-84389 A (Patent Document 2).
　特許文献１のドラム式洗濯機においては、ドラムが回転する方向側に設けられ槽ユニットの重心位置より正面側寄りの位置に配設された第一防振ダンパと、槽ユニットの重心位置より背面側寄りの位置に配設された第二防振ダンパとからなり、第一防振ダンパ及び第二防振ダンパが連結された筐体連結部が第三緩衝材Ａと第三緩衝材Ｂとを介して洗濯機筐体に取り付けられている。そして、第一防振ダンパと第二防振ダンパ、及び第三緩衝材Ａと第三緩衝材Ｂによって、槽ユニットの振動を前後・左右方向にも減衰することができる。 The drum-type washing machine in Patent Document 1 comprises a first vibration damper disposed on the side in the direction in which the drum rotates, closer to the front than the center of gravity of the tub unit, and a second vibration damper disposed on the rear than the center of gravity of the tub unit, and the housing connection part to which the first and second vibration dampers are connected is attached to the washing machine housing via third cushioning material A and third cushioning material B. The first and second vibration dampers, and third cushioning material A and third cushioning material B, can also dampen vibrations of the tub unit in the front-back and left-right directions.
　特許文献２のドラム式洗濯機においては、吊り下げ支持され水槽と、水槽内で回転するドラムとを備え、水槽下部と洗濯機本体との間に前後方向に傾けて取り付けられ両者間に角度θをつけて配設された一対のダンパが備えられている。そして、一対のダンパによって、前後方向にも減衰力を発生させて水槽の振動を抑えることができる。 The drum-type washing machine in Patent Document 2 has a suspended water tub and a drum that rotates within the water tub, and is equipped with a pair of dampers that are installed between the bottom of the water tub and the washing machine body at an angle θ between them and are inclined in the front-to-rear direction. The pair of dampers also generate a damping force in the front-to-rear direction, suppressing vibration of the water tub.
特開２０１５―５３９４７号公報JP 2015-53947 A 特開平５―８４３８９号公報Japanese Patent Application Laid-Open No. 5-84389
　良く知られているようにドラム式洗濯機の脱水運転では、回転ドラムの回転数を段階的に上昇させ高速回転で遠心脱水を行うため、脱水中の衣類の偏り等によって外槽に振動が往々にして発生する。そして、外槽が過大に振動した場合、外槽と筐体の接触による異常振動や、最悪の場合ドラム式洗濯機の破損に繋がる恐れがある。特にドラムの奥行き寸法が長いドラム式洗濯機では、衣類の偏り量が小さくとも、モーメントアームが大きくなるため、外槽の首振り運動による前後方向の振動が問題となる。 As is well known, during the spin cycle of a drum-type washing machine, the rotation speed of the rotating drum is increased in stages to perform centrifugal spin-drying at high speeds, which often causes vibrations in the outer tub due to uneven distribution of clothes during spin cycle. If the outer tub vibrates excessively, it can lead to abnormal vibrations caused by contact between the outer tub and the housing, and in the worst case scenario, damage to the drum-type washing machine. In particular, in drum-type washing machines with a long drum depth, even if the amount of uneven distribution of clothes is small, the moment arm becomes large, and the back-and-forth vibrations caused by the swinging movement of the outer tub become a problem.
　外槽と筐体を繋ぐ防振機構（所謂、防振ダンパ）の減衰性能を高くすることで、外槽が共振する回転数区間での外槽の振動を抑制できる。一方で、高減衰性能の防振機構では、高速回転時に外槽の振動が筐体へと伝達され、筐体及びドラム式洗濯機の設置床が振動する。筐体の振動と設置床の振動は、使用者の不快感へと繋がるため、外槽の振動と筐体及び設置床の振動の抑制を両立することが求められている。 By increasing the damping performance of the vibration isolation mechanism (so-called vibration damper) that connects the outer tub to the housing, it is possible to suppress vibration of the outer tub at the rotation speed range where the outer tub resonates. On the other hand, with a vibration isolation mechanism with high damping performance, the vibration of the outer tub is transmitted to the housing during high-speed rotation, causing the housing and the floor on which the drum washing machine is placed to vibrate. Since the vibration of the housing and the vibration of the floor on which the washing machine is placed can lead to discomfort for the user, it is necessary to simultaneously suppress the vibration of the outer tub and the vibration of the housing and the floor on which the washing machine is placed.
　特許文献１においては、外槽の下部に、複数の防振ダンパと、防振ダンパと筐体の連結部に緩衝材を設けることで、洗濯機の正面から見て左右方向、上下方向、前後方向の外槽の振動を抑制している。 In Patent Document 1, multiple vibration dampers are provided under the outer tub, and cushioning material is provided at the connection between the vibration dampers and the housing, suppressing vibration of the outer tub in the left-right, up-down, and front-back directions when viewed from the front of the washing machine.
　防振ダンパは外槽の左右方向、上下方向の振動に対して減衰を付与する姿勢で取り付けられており、前後方向の振動に対しては主に緩衝材の減衰によって抑制される。そのため、高減衰性能の緩衝材を必要とするので、高速回転時に筐体及び設置床へ伝達する振動の増加を招く恐れがある。 The vibration damper is installed in a position that attenuates vibrations in the left-right and up-down directions of the outer tank, while vibrations in the front-back direction are mainly suppressed by the damping of the cushioning material. This requires cushioning material with high damping performance, which may increase the vibrations transmitted to the housing and installation floor during high-speed rotation.
　また、特許文献２においては、外槽の下部に前後方向に傾けて取り付けられた複数の防振ダンパを有しており、前後方向の振動の減衰により外槽の振動を抑制している。しかしながら、外槽の共振時の前後方向の振動モードを考慮していないため、外槽の首振り運動による前後方向の振動が大きく生じても、防振ダンパが大きくストロークできず、逆に減衰性能が小さい防振ダンパでは十分に振動を減衰できない恐れがある。そのため、前後方向の振動を抑制するには、高減衰性能の防振ダンパを使用する必要があり、特許文献１と同様に高速回転時に筐体及び設置床に伝達する振動の増加を招く恐れがある。 In addition, in Patent Document 2, there are multiple vibration dampers attached to the bottom of the outer tub at an angle in the front-to-rear direction, and vibration in the outer tub is suppressed by damping the vibration in the front-to-rear direction. However, since the front-to-rear vibration mode during resonance of the outer tub is not taken into consideration, even if large vibration in the front-to-rear direction occurs due to the swinging movement of the outer tub, the vibration dampers cannot stroke widely, and conversely, there is a risk that a vibration damper with low damping performance cannot sufficiently dampen the vibration. Therefore, in order to suppress vibration in the front-to-rear direction, it is necessary to use a vibration damper with high damping performance, which, like Patent Document 1, may result in an increase in vibration transmitted to the housing and installation floor during high-speed rotation.
　本発明の目的は、外槽の前後方向の振動を抑制すると共に、筐体及び設置床に伝達する振動の増加を抑制することができるドラム式洗濯機を提供することにある。 The object of the present invention is to provide a drum-type washing machine that can suppress vibrations in the front-to-rear direction of the outer tub and suppress an increase in vibrations transmitted to the housing and installation floor.
　本発明は、筐体と、筐体内に支持され内部に洗濯水を貯留可能な外槽と、外槽に内包され電動モータで回転される回転ドラムと、外槽の下部と筐体の底部とを連結する複数の防振ダンパを備えたドラム式洗濯機であって、
　外槽の衣類投入開口部を正面から見た平面視において、衣類投入開口部の中心を通る重力方向の分割線を仮想的に設定したとき、複数の防振ダンパの少なくとも一つの防振ダンパは、
　回転ドラムの脱水運転時の回転方向が左回転の場合は、分割線の左側の領域に設置され、回転ドラムの脱水運転時の回転方向が、右回転の場合は分割線の右側の領域に設置され、
　更に、一つの防振ダンパと外槽との外槽側取付部は、外槽の軸線方向で見て、衣類投入開口部の側に寄せて配置され、一つの防振ダンパと筐体との筐体側取付部は、外槽の軸線方向で見て、衣類投入開口部から外槽側取付部より離れて配置されている、ことを特徴とする。 The present invention provides a drum-type washing machine including a housing, an outer tub supported within the housing and capable of storing wash water therein, a rotary drum contained within the outer tub and rotated by an electric motor, and a plurality of vibration dampers connecting a lower portion of the outer tub to a bottom of the housing,
In a plan view of the clothes insertion opening of the outer tub seen from the front, when a dividing line is imaginarily set in the direction of gravity passing through the center of the clothes insertion opening, at least one of the plurality of vibration dampers is
When the rotating drum rotates counterclockwise during the dehydration operation, the drum is installed in the area to the left of the dividing line, and when the rotating drum rotates clockwise during the dehydration operation, the drum is installed in the area to the right of the dividing line.
Furthermore, the outer tub side mounting portion between one vibration damper and the outer tub is positioned closer to the clothing insertion opening when viewed in the axial direction of the outer tub, and the housing side mounting portion between one vibration damper and the housing is positioned farther from the clothing insertion opening than the outer tub side mounting portion when viewed in the axial direction of the outer tub.
　外槽の前後方向の振動を抑制すると共に、筐体及び設置床に伝達する振動の増加を抑制することができる。 It is possible to suppress vibrations in the front and rear directions of the outer tank, and also to suppress the increase in vibrations transmitted to the housing and installation floor.
本発明が適用されたドラム式洗濯機の斜視図である。1 is a perspective view of a drum-type washing machine to which the present invention is applied; ドラム式洗濯機の内部構成を説明する縦方向の断面を示す断面図である。FIG. 2 is a cross-sectional view showing a vertical cross section illustrating an internal configuration of the drum type washing machine. 脱水工程時の回転ドラムの回転数の制御パターンを示すチャート図である。FIG. 4 is a chart showing a control pattern of the rotation speed of the rotating drum during a dehydration process. 外槽の夫々の振動方向の振動位相の変化を説明する説明図である。10A and 10B are explanatory diagrams illustrating changes in vibration phase in each vibration direction of the outer tank. 外槽の衣類投入開口部の側から見た振動軌跡を説明する説明図である。11 is an explanatory diagram illustrating a vibration trajectory as viewed from the side of the clothes insertion opening of the outer tub. FIG. 外槽の首振り運動を説明する説明図である。FIG. 11 is an explanatory diagram illustrating the swinging motion of the outer tub. 本発明の実施形態になる外槽と筐体、及び防振ダンパの配置関係を説明するための外槽の正面から見た構成図である。1 is a configuration diagram showing the outer tub as viewed from the front, illustrating the positional relationship between the outer tub, the housing, and the vibration damper according to an embodiment of the present invention. FIG. 本発明の実施形態になる外槽と筐体、及び防振ダンパの配置関係を説明するための外槽の側面から見た構成図である。1 is a configuration diagram seen from the side of the outer tank to explain the positional relationship between the outer tank, the housing, and the vibration damper according to an embodiment of the present invention. FIG. 本実施形態における防振ダンパの第1の挙動を説明するための説明図である。4A to 4C are explanatory diagrams for explaining a first behavior of the vibration damper in the present embodiment. 本実施形態における防振ダンパの第２の挙動を説明するための説明図である。10 is an explanatory diagram for explaining a second behavior of the vibration damper in the present embodiment. FIG.
　以下、本発明の実施形態について図面を用いて詳細に説明するが、本発明は以下の実施形態に限定されることなく、本発明の技術的な概念の中で種々の変形例や応用例をもその範囲に含むものである。 The following describes in detail an embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the following embodiment, and the scope of the present invention includes various modifications and applications within the technical concept of the present invention.
　図１は本発明が適用されるドラム式洗濯機１００の斜視図であり、図２はドラム式洗濯機１００の内部構造を示す側面図である。以下、図１と図２を用いて、ドラム式洗濯機１００の一般的な構成とその動作を説明する。 FIG. 1 is a perspective view of a drum-type washing machine 100 to which the present invention is applied, and FIG. 2 is a side view showing the internal structure of the drum-type washing machine 100. Below, the general configuration and operation of the drum-type washing machine 100 will be explained using FIG. 1 and FIG. 2.
　図１に示すドラム式洗濯機１００の外郭を構成する筐体１は、筐体ベース１ａの上に取付けられており、左右の側板１ｂ（図１では右の側板のみを示している）、前面カバー１ｃ、背面カバー１ｄ（図２参照）、上面カバー１ｅ、下部前面カバー１ｆで構成されている。 The housing 1 that constitutes the outer shell of the drum-type washing machine 100 shown in FIG. 1 is attached to a housing base 1a and is composed of left and right side panels 1b (only the right side panel is shown in FIG. 1), a front cover 1c, a rear cover 1d (see FIG. 2), a top cover 1e, and a lower front cover 1f.
　上面カバー１ｅには、水道栓からドラム式洗濯機１００に給水するための給水ホース接続口３０を設けている。筐体１は、ベース１ａを含めて箱状の外枠を形成し、外枠として十分な強度を有している。 The top cover 1e is provided with a water supply hose connection port 30 for supplying water from a water tap to the drum-type washing machine 100. The housing 1, including the base 1a, forms a box-shaped outer frame, and has sufficient strength as an outer frame.
　ドア２は、前面カバー１ｃの略中央に設けた衣類を出し入れするための衣類投入口（図示せず）を塞ぐためのもので、前面カバー１ｃに設けたヒンジ（図示せず）で開閉可能に支持されている。ドア２は、ドア開放取手２ａを手前に引くことで、ロック機構（図示せず）が外れて開かれ、一方、ドア２を前面カバー１ｃに押し付けることでロックされて閉じられる。前面カバー１ｃは、後述する外槽１１の衣類投入開口部と略同心で、衣類を出し入れするための円形の衣類投入開口部を有している。 The door 2 is used to cover a clothing insertion opening (not shown) located approximately in the center of the front cover 1c for inserting and removing clothing, and is supported so as to be openable and closable by a hinge (not shown) provided on the front cover 1c. The door 2 is opened by pulling the door opening handle 2a towards the user, which releases a locking mechanism (not shown), and is closed by pressing the door 2 against the front cover 1c. The front cover 1c has a circular clothing insertion opening for inserting and removing clothing, approximately concentric with the clothing insertion opening of the outer tub 11 described below.
　筐体１の上部に設けた操作・表示パネル３は、電源スイッチ４、操作スイッチ５、及び表示器６を備える。操作・表示パネル３は筐体１の上部に設けた上補強部材１３（図２参照）に備えられている制御部７（図２参照）に電気的に接続している。制御部７には冷却ファン（図示せず）が取付けられている。また、制御部７は、ドラム式洗濯機の運転を記録可能なメモリを備えている。筐体ベース１ａの近傍には、排水を行うための排水ホース１４が取付けられている。 The operation and display panel 3 provided on the top of the housing 1 includes a power switch 4, an operation switch 5, and a display 6. The operation and display panel 3 is electrically connected to a control unit 7 (see FIG. 2) provided on an upper reinforcing member 13 (see FIG. 2) provided on the top of the housing 1. A cooling fan (not shown) is attached to the control unit 7. The control unit 7 also includes a memory capable of recording the operation of the drum washing machine. A drain hose 14 for draining water is attached near the housing base 1a.
　図２に示すドラム式洗濯機１００の筐体１の内部には、水を溜める外槽１１が備えられている。外槽１１の上部は、外槽１１の姿勢を保持するために、コイルばねで構成された二組の懸架手段８で連結されている。外槽１１の下部は、筐体１に取り付けられた複数の防振ダンパ２４ａ～２４ｄで連結されている。防振ダンパ２４ａ～２４ｄの両端と外槽１１及び筐体１の連結部は、外槽１１の振動方向に対して揺動可能な状態で取り付けられる。 The housing 1 of the drum-type washing machine 100 shown in FIG. 2 is provided with an outer tub 11 for storing water. The upper part of the outer tub 11 is connected by two sets of suspension means 8 consisting of coil springs in order to maintain the position of the outer tub 11. The lower part of the outer tub 11 is connected by a number of vibration dampers 24a-24d attached to the housing 1. The connection parts between both ends of the vibration dampers 24a-24d and the outer tub 11 and housing 1 are attached in a state where they can swing in the vibration direction of the outer tub 11.
　防振ダンパ２４の本数は、２本以上あれば良く、その構成は限定されない。本実施形態では上述のように４本としている。尚、本実施形態では、特にドア２の側を正面としたときに、外槽１１のドア２の側に近い方の位置に設けた防振ダンパ２４ｄの配置形態に特徴を有している。これについては図７Ａ、図７Ｂを用いて説明する。 The number of vibration dampers 24 may be two or more, and the configuration is not limited. In this embodiment, there are four, as described above. Note that this embodiment is characterized by the arrangement of vibration dampers 24d, which are provided in a position closer to the door 2 side of the outer tub 11, when the door 2 side is the front. This will be explained using Figures 7A and 7B.
　外槽１１の内部は、衣類を洗濯するための回転ドラム２１を内包している。外槽１１の後方には、回転ドラム２１を回転させるための電動モータ２２を備えている。電動モータ２２は、回転軸となるシャフト２２ａが外槽１１を貫通し、回転ドラム２１と機械的に結合している。電動モータ２２が回転、駆動されると、回転ドラム２１は、正転（ドラム式洗濯機１００のドア２を正面から見て左回り）、逆転（ドラム式洗濯機１００のドアを正面から見て右回り）の両方向に回転駆動される。 The outer tub 11 contains a rotating drum 21 for washing clothes. An electric motor 22 for rotating the rotating drum 21 is provided at the rear of the outer tub 11. The electric motor 22 has a shaft 22a that serves as the rotation axis, which passes through the outer tub 11 and is mechanically connected to the rotating drum 21. When the electric motor 22 rotates and is driven, the rotating drum 21 is driven to rotate in both forward (counterclockwise when viewed from the front of the door 2 of the drum type washing machine 100) and reverse (clockwise when viewed from the front of the door of the drum type washing machine 100).
　図２に示す回転ドラム２１の回転軸線Ａｚは、ドラム式洗濯機１００のドア２の側の前方から後方に向けて水平、又は奥側が下になるように傾斜している（図２は奥側が下になるように傾斜している）。電動モータ２１には回転速度を検知する回転速度検知装置１０が設けられている。 The rotation axis Az of the rotating drum 21 shown in FIG. 2 is horizontal from the front to the rear on the door 2 side of the drum-type washing machine 100, or is inclined so that the rear side is downwards (FIG. 2 shows the rear side inclined so that the rear side is downwards). The electric motor 21 is provided with a rotation speed detection device 10 that detects the rotation speed.
　回転ドラム２１の内周面には、回転ドラム２１内の洗濯水を外槽１１に排水するための複数個の脱水孔２１ｂや、回転ドラム２１の周方向に間隔をおいて、回転ドラム２１内に投入された衣類を持ち上げるための複数個（図２では１個のみを図示）のバッフル２３が設けられている。バッフル２３は、回転ドラム２１の前後方向に延在している。 The inner circumferential surface of the rotating drum 21 is provided with a number of dewatering holes 21b for draining the washing water in the rotating drum 21 into the outer tub 11, and a number of baffles 23 (only one is shown in FIG. 2) spaced apart around the circumference of the rotating drum 21 for lifting clothes placed in the rotating drum 21. The baffles 23 extend in the front-to-rear direction of the rotating drum 21.
　回転ドラム２１の前端（ドア２の側）には、円筒状の流体バランサ２１ｃが設けられている。外槽１１は、前方を開口部として、後方を閉じた有底の略円筒を形成している。この外槽１１の衣類投入開口部と筺体１の衣類投入開口部は、前後方向に伸縮しやすいベローズ１６により接続される。ベローズ１６は、環状のパッキンであり、ドア２を閉めることで回転ドラム２１を水封する。 A cylindrical fluid balancer 21c is provided at the front end (door 2 side) of the rotating drum 21. The outer tub 11 is roughly cylindrical with an opening at the front and a closed rear, and has a bottom. The clothes insertion opening of the outer tub 11 and the clothes insertion opening of the housing 1 are connected by a bellows 16 that easily expands and contracts in the front-to-rear direction. The bellows 16 is an annular packing that seals the rotating drum 21 against water when the door 2 is closed.
　また、筐体１の衣類投入開口部、外槽１１の衣類投入開口部、回転ドラム２１の衣類投入開口部はそれぞれ連通しており、ドア２を開くことで回転ドラム２１内への衣類の出し入れが可能となる。尚、外槽１１は、衣類投入開口部を含む側と、電動モータ２２の取り付けられる側とに分割することもできる。 The clothing insertion opening of the housing 1, the clothing insertion opening of the outer tub 11, and the clothing insertion opening of the rotating drum 21 are all connected to each other, and opening the door 2 makes it possible to put clothes in and take them out of the rotating drum 21. The outer tub 11 can also be divided into a side that includes the clothing insertion opening and a side where the electric motor 22 is attached.
　外槽１１の下部に備えられた排水口１９は、内部排水ホース１４と接続している。糸くず捕集ボックス１７には、洗濯水を循環させるための循環ポンプ２０が設けられており、循環経路２０aを介して洗濯水を回転ドラム２１内に散布する。外部排水ホース１５には排水弁１５aが設けられ、排水弁１５aを閉じて給水することで外槽１１に水を溜め、排水弁１５aを開いて外槽１１内の水を機外へ排出する。 The drain port 19 provided at the bottom of the outer tub 11 is connected to the internal drain hose 14. The lint collection box 17 is provided with a circulation pump 20 for circulating the wash water, and the wash water is sprayed into the rotating drum 21 via a circulation path 20a. The external drain hose 15 is provided with a drain valve 15a, and water is stored in the outer tub 11 by closing the drain valve 15a and supplying water, and the water in the outer tub 11 is discharged outside the machine by opening the drain valve 15a.
　更に外槽１１の下部には、外槽１１の振動を検知する外槽振動検知部１８が備えられており、外槽１１の振動が予め設定した閾値を超えると、回転ドラム２１の回転を一時停止させ、衣類の偏りを修正して脱水工程のやり直しを行う。振動が閾値以下の場合のみ、回転ドラム２１の回転速度を上昇させ、過大な振動の発生を抑制している。 Furthermore, the lower part of the outer tub 11 is provided with an outer tub vibration detection unit 18 that detects the vibration of the outer tub 11. When the vibration of the outer tub 11 exceeds a preset threshold, the rotation of the rotating drum 21 is temporarily stopped, the clothes are corrected, and the spin-drying process is restarted. Only when the vibration is below the threshold is the rotation speed of the rotating drum 21 increased to prevent excessive vibration.
　次に、上記構成におけるドラム式洗濯機１００の動作を説明する。このように構成されたドラム式洗濯機１００では、まず利用者が電源スイッチ４を押すことで、ドラム式洗濯機１００が起動する。 Next, the operation of the drum type washing machine 100 configured as above will be described. In the drum type washing machine 100 configured as above, the user first presses the power switch 4, which starts the drum type washing machine 100.
　そして、利用者はドア開放取手２ａを引き、ドア２を開いて回転ドラム２１内に衣類を投入する。そして、利用者はドア２を閉じた後、操作スイッチ５を操作することで運転を開始する。 Then, the user pulls the door opening handle 2a to open the door 2 and place the clothes into the rotating drum 21. After closing the door 2, the user operates the operation switch 5 to start operation.
　運転が開始されると、回転ドラム２１が回転して注水前の衣類容量を算出する。衣類容量は、電動モータ２２の回転数と電流値に基づいて算出される。このとき、衣類容量が多い程、電動モータ２２に負荷が加わるため、電流値が大きくなるので、電流値で衣類容量を判定する。そして、衣類容量に基づいて、投入する洗剤量が表示器６に表示される。このとき、算出した衣類容量が多い程、投入する洗剤量も多くなる。利用者は、表示器６の表示を確認して、洗剤容器１２内に所定量の洗剤量を投入して、洗い工程を開始する。 When operation begins, the rotating drum 21 rotates to calculate the laundry volume before water is poured in. The laundry volume is calculated based on the rotation speed and current value of the electric motor 22. At this time, the greater the laundry volume, the greater the load on the electric motor 22, and therefore the greater the current value, so the laundry volume is determined from the current value. Then, the amount of detergent to be added is displayed on the display 6 based on the laundry volume. At this time, the greater the calculated laundry volume, the greater the amount of detergent to be added. The user checks the display 6, pours a specified amount of detergent into the detergent container 12, and starts the washing process.
　洗い工程では、給水弁３２を開いて、給水ホース接続口３０から供給した水を内部給水ホース３１および洗剤容器１２を介して、洗剤と共に外槽１１内に供給する。このとき、算出した衣類容量が多い程、洗い工程での給水量が多くなる。更に、循環ポンプ２０内で未溶解の洗剤と水とが撹拌される。これにより、効率よく洗剤が溶かされ、高濃度の洗剤液が生成される。この動作を所定時間実行した後、回転ドラム２１を正転、停止、逆転、停止を繰り返す洗い動作を所定時間行う。このとき、衣類がバッフル２３によって持ち上げられて落下する動作が繰り返されることで衣類の洗浄を行う。 In the washing process, the water supply valve 32 is opened, and water supplied from the water supply hose connection port 30 is supplied into the outer tub 11 together with detergent via the internal water supply hose 31 and detergent container 12. At this time, the greater the calculated volume of clothes, the greater the amount of water supplied in the washing process. Furthermore, undissolved detergent and water are agitated in the circulation pump 20. This efficiently dissolves the detergent and produces a highly concentrated detergent solution. After this operation is performed for a predetermined time, a washing operation is performed for a predetermined time in which the rotating drum 21 is rotated forward, stopped, reversed, and stopped repeatedly. At this time, the clothes are lifted by the baffle 23 and dropped repeatedly, thereby washing the clothes.
　洗い工程を行った後、脱水工程を行う。脱水工程は、図３を参照にして説明を行う。図３は、脱水工程における回転ドラム２１の回転数の制御パターンを示している。まず、洗い工程終了後に排水弁１５ａを開くことで、外槽１１内の水が排水ホース１４を介して、ドラム式洗濯機１００の外部（機外）に排出される。脱水工程では、回転ドラム２１の回転数を回転ドラム２１の内周面に衣類を広げながら張り付ける低速回転数域（ｔ１～ｔ２）と、外槽１１の共振区間（ｔ２～ｔ３）と、筐体１の共振区間（ｔ３～ｔ４）と、筐体１の共振後区間（ｔ４～ｔ５）とを通過させながら、目標回転数区間（ｔ５～ｔ６）まで上昇させて、衣類に含まれる水分を遠心脱水する。 After the washing process, the spin-drying process is performed. The spin-drying process will be described with reference to FIG. 3. FIG. 3 shows the control pattern of the rotation speed of the rotating drum 21 in the spin-drying process. First, by opening the drain valve 15a after the washing process is completed, the water in the outer tub 11 is drained to the outside (outside the machine) of the drum-type washing machine 100 via the drain hose 14. In the spin-drying process, the rotation speed of the rotating drum 21 is increased to the target rotation speed range (t5-t6) while passing through a low rotation speed range (t1-t2) in which the clothes are spread and attached to the inner surface of the rotating drum 21, a resonance range (t2-t3) of the outer tub 11, a resonance range (t3-t4) of the housing 1, and a post-resonance range (t4-t5) of the housing 1, thereby centrifugally spinning off the moisture contained in the clothes.
　低速回転域では、回転ドラム２１の回転数をω０（例えば５０ｒ／ｍｉｎ）まで上昇させる。このとき、洗い工程で水分を含んだ衣類が回転ドラム２１の回転時にバッフル２３によって持ち上げられ、衣類が落下する際に回転ドラム２１の内周面に広げられる。回転ドラム２１の回転数がω０に到達したら、ω０における衣類の偏りを検知するため、回転ドラム２１をω０でＴ１（例えば１０秒）時間だけ運転する。 In the low-speed rotation range, the rotation speed of the rotating drum 21 is increased to ω 0 (e.g., 50 r/min). At this time, clothes that have absorbed moisture during the washing process are lifted by the baffle 23 as the rotating drum 21 rotates, and as the clothes fall, they are spread out on the inner circumferential surface of the rotating drum 21. When the rotation speed of the rotating drum 21 reaches ω 0 , the rotating drum 21 is operated at ω 0 for a time T1 (e.g., 10 seconds) in order to detect the uneven distribution of the clothes at ω 0 .
　低速回転域の衣類の偏り検知は、回転変動の大きさによって判定する。尚、回転変動は、例えば、回転ドラム２１が１回転する際、衣類を回転ドラム２１の下方から上方に持ち上げる速度（最低速度）と、衣類を回転ドラム２１の上方から下方に下げる速度（最高速度）の差分から求める。回転変動が小さければ小さいほど、衣類の偏りが少ないことが確認できる。ω０の衣類の偏り検知において、回転変動が予め設定した閾値以下であると判定した場合には、回転ドラム２１の回転数をω０からω１（例えば８０ｒ／ｍｉｎ）まで上昇させる。 Detection of uneven distribution of clothes in the low rotation speed range is determined based on the magnitude of rotation fluctuation. The rotation fluctuation is calculated, for example, from the difference between the speed at which clothes are lifted from the bottom of the rotating drum 21 to the top (minimum speed) and the speed at which clothes are lowered from the top of the rotating drum 21 to the bottom (maximum speed) when the rotating drum 21 makes one rotation. The smaller the rotation fluctuation, the less uneven distribution of clothes can be confirmed. When it is determined that the rotation fluctuation is equal to or less than a preset threshold value in detecting uneven distribution of clothes at ω0 , the rotation speed of the rotating drum 21 is increased from ω0 to ω1 (e.g., 80 r/min).
　回転ドラム２１の回転数がω１に到達したら、衣類の偏り検知を行うため、ω１でＴ２（例えば５秒）時間だけ運転する。なお、ω０とω１は、衣類の張り付き具合を検知する回転数となっており、ω０は衣類が回転ドラム２１の内周面に張り付き始める回転数、ω１は衣類が回転ドラム２１の内周面に完全に張り付く回転数となる。 When the rotation speed of the rotating drum 21 reaches ω1 , it is operated at ω1 for a time T2 (e.g., 5 seconds) to detect uneven distribution of the clothes. Note that ω0 and ω1 are rotation speeds for detecting the degree of adhesion of the clothes, with ω0 being the rotation speed at which the clothes start to adhere to the inner circumferential surface of the rotating drum 21 and ω1 being the rotation speed at which the clothes completely adhere to the inner circumferential surface of the rotating drum 21.
　ω１で所定時間運転した後、ω1での衣類の偏り検知において、回転変動が予め設定した閾値以下であると判定した場合には、回転ドラム２１の回転数をω２（例えば４００ｒ／ｍｉｎ）まで上昇させて、外槽１１の共振区間を通過させる。外槽１１の共振区間を通過する際、外槽１１の振動振幅が所定値よりも小さい場合は、回転ドラム２１の回数数をω３（例えば６００ｒ／ｍｉｎ）まで上昇させて、筐体１の共振区間を通過させる。 After operating at ω1 for a predetermined time, if it is determined that the rotational fluctuation is equal to or less than a preset threshold value in the uneven distribution of clothes detection at ω1 , the rotation speed of the rotating drum 21 is increased to ω2 (e.g., 400 r/min) to pass through the resonance zone of the outer tub 11. If the vibration amplitude of the outer tub 11 is smaller than a predetermined value when passing through the resonance zone of the outer tub 11, the rotation speed of the rotating drum 21 is increased to ω3 (e.g., 600 r/min) to pass through the resonance zone of the housing 1.
　筐体１の共振区間を通過する際、外槽１１の振動振幅が所定値よりも小さい場合は、回転ドラム２１の回転数を目標（例えば９００ｒ／ｍｉｎ）まで上昇させる。目標回転数区間では、回転ドラム２１をＴ３（例えば１８０秒）で所定時間運転した後、回転ドラム２１の回転数を０ｒ/ｍｉｎまで低下（ｔ６～ｔ７）させて、脱水工程を終了する。 When passing through the resonance zone of the housing 1, if the vibration amplitude of the outer tub 11 is smaller than a predetermined value, the rotation speed of the rotating drum 21 is increased to a target (e.g., 900 r/min). In the target rotation speed zone, the rotating drum 21 is operated for a predetermined time at T3 (e.g., 180 seconds), and then the rotation speed of the rotating drum 21 is decreased to 0 r/min (t6 to t7) to end the dehydration process.
　脱水工程で、回転ドラム２１の内周面に張り付いた衣類の偏りが大きい場合、回転ドラム２１の回転変動や、外槽１１の振動振幅が閾値よりも大きくなる。そのため、回転ドラム２１の回転数を低下、または回転ドラム２１の回転を停止して、回転ドラム２１の正転と逆転を繰り返すほぐし動作や、注水を行い、衣類の偏りを修正する動作を実行する。 If the clothes stuck to the inner surface of the rotating drum 21 during the dehydration process are unevenly distributed, the rotational fluctuations of the rotating drum 21 and the vibration amplitude of the outer tub 11 will exceed a threshold value. Therefore, the rotation speed of the rotating drum 21 will be reduced or the rotation of the rotating drum 21 will be stopped, and an operation will be performed to correct the uneven distribution of the clothes by repeating forward and reverse rotation of the rotating drum 21 to loosen the clothes or by injecting water.
　次に、脱水工程を行った後、すすぎ工程を行う。このすすぎ工程では、給水弁３２を開いて、給水ホース接続口３０から供給した水道水を給水ホース３１、及び洗剤容器１２を介して、外槽１１内に供給する。また、洗い工程と同様に、算出した衣類容量が多い程、給水量が多くなる。このすすぎ工程では、洗い工程と同様に、回転ドラム２１の正転、停止、逆転、停止の動作を繰り返す。このとき、バッフル２３によって持ち上げられた衣類が落下する攪拌動作を所定時間行う。 Next, after the spin cycle, the rinsing cycle is performed. In this rinsing cycle, the water supply valve 32 is opened and tap water supplied from the water supply hose connection port 30 is supplied into the outer tub 11 via the water supply hose 31 and detergent container 12. As with the washing cycle, the greater the calculated laundry volume, the greater the amount of water supplied. In this rinsing cycle, as with the washing cycle, the rotating drum 21 repeatedly rotates forward, stops, reverses, and stops. At this time, an agitation operation is performed for a predetermined period of time, in which the clothes lifted by the baffle 23 fall.
　その後、上述した脱水工程、及びすすぎ工程を所定回数繰り返し、最終脱水工程に移行する。この最終脱水工程における目標回転数区間における運転時間は、脱水工程より長く設定（例えば３００秒）されている。 Then, the above-mentioned spin-drying process and rinsing process are repeated a predetermined number of times, and the machine moves to the final spin-drying process. The operating time in the target rotation speed range for this final spin-drying process is set longer than that for the spin-drying process (e.g., 300 seconds).
　このように脱水工程では、回転数と衣類の偏りに応じて、複数の共振領域を持ち、ドラム式洗濯機１００の振動が変化する。図４に外槽の共振区間（例えば、１００r/min～４００r/min）における回転ドラム２１の回転数と各方向（上下方向、左右方向、前後方向）の振動位相の推移を示している。 In this way, during the spin-drying process, the vibration of the drum-type washing machine 100 changes across multiple resonance regions depending on the rotation speed and the uneven distribution of clothes. Figure 4 shows the changes in the rotation speed of the rotating drum 21 and the vibration phase in each direction (up and down, left and right, front and back) in the resonance range of the outer tub (e.g., 100 r/min to 400 r/min).
　ここで、(１)上下方向の振動とは、ドラム式洗濯機が家屋の設置床に設置された状態で、ドア２を正面とした平面視において重力方向の振動を意味し、(２)左右方向の振動とは、ドア２を正面とした平面視の重力方向と直交する方向の振動を意味し、(３)前後方向とは、回転ドラム２１の回転軸線Ａｚ（図２参照）が延びる方向で、しかも重心周りの方向の振動を意味している。また、振動位相の基準は、衣類の偏りが外槽１１の最も右側に在る時を「０°」（図５のＸ－Ｘ分割線と交わる右側の部分）としている。 Here, (1) vertical vibration means vibration in the direction of gravity in a plan view with the door 2 facing forward when the drum washing machine is installed on the installation floor of a house, (2) left-right vibration means vibration in a direction perpendicular to the direction of gravity in a plan view with the door 2 facing forward, and (3) front-rear vibration means vibration in the direction in which the rotation axis Az (see Figure 2) of the rotating drum 21 extends, and also in the direction around the center of gravity. In addition, the reference for the vibration phase is "0°" when the clothes are biased to the far right of the outer tub 11 (the right part that intersects with the X-X dividing line in Figure 5).
　図４において、回転ドラム２１の回転数の増加に応じて、各方向の振動位相が推移し、外槽１１の振動モードが変化する。前後方向の振動位相は、外槽１１の共振時（共振回転数Ｎｒｍで表示）に初期位相０°から９０°程度移動し、その後回転ドラム２１の回転数が増加するにつれて初期位相０°から１８０°移動するように推移する。尚、外槽１１の姿勢を支持するための懸架手段８等のばね成分により、左右方向の振動位相より上下方向の振動位相の共振する回転数が高くなる。更に回転ドラム２１の回転数が上昇すると外槽１１の首振り運動による前後方向の共振が生じる。 In Figure 4, as the rotation speed of the rotating drum 21 increases, the vibration phase in each direction shifts, and the vibration mode of the outer tub 11 changes. The vibration phase in the front-to-rear direction shifts from an initial phase of 0° to approximately 90° when the outer tub 11 resonates (shown as resonant rotation speed Nrm), and then shifts from the initial phase of 0° to 180° as the rotation speed of the rotating drum 21 increases. Note that due to spring components such as the suspension means 8 for supporting the posture of the outer tub 11, the rotation speed at which the vertical vibration phase resonates is higher than that of the horizontal vibration phase. Furthermore, as the rotation speed of the rotating drum 21 increases, resonance in the front-to-rear direction occurs due to the swinging motion of the outer tub 11.
　図５は、前後方向の振動の共振モードが生じた際の外槽１１を正面（衣類投入開口部側）から見た振動軌跡を示し、同様に図６は外槽１１を斜視した際の振動軌跡を示している。ここで、図５においては説明の都合から、衣類投入開口部１１ｏｐの中心Ｃを通る上下方向（重力方向）のＹ－Ｙ分割線と、これに直交し中心Ｃを通る左右方向のＸ－Ｘ分割線によって、仮想的に「右上領域」、「右下領域」、「左上領域」、「左下領域」の４領域に分割している。尚、衣類投入開口部１１ｏｐはベローズ１６等の関係部品の表示を省略して表示している。 Figure 5 shows the vibration trajectory when the outer tub 11 is viewed from the front (clothing opening side) when a resonant mode of vibration in the front-to-rear direction occurs, and similarly Figure 6 shows the vibration trajectory when the outer tub 11 is viewed obliquely. Here, for convenience of explanation in Figure 5, the clothing opening 11op is virtually divided into four areas, the "upper right area", "lower right area", "upper left area", and "lower left area", by a Y-Y dividing line in the vertical direction (gravity direction) that passes through the center C of the clothing opening 11op, and an X-X dividing line that is perpendicular to this and passes through the center C in the horizontal direction. Note that the clothing opening 11op is shown without showing related parts such as the bellows 16.
　そして、外槽１１に前後方向の振動の共振モードが生じる回転数Ｎｒｍ（図４参照）では、外槽１１の左右方向の振動位相と上下方向の振動位相の位相差が９０°よりもかなり小さく、例えば、図４では約２５°の位相差である。そのため、回転ドラム２１が正転方向（左回転）で脱水運転を行う場合は、外槽１１の衣類投入開口部１１ｏｐの正面から見て、左下領域から右上領域に跨る、右肩上がりに傾斜した楕円形の振動軌跡で外槽１１が振動する。 At the rotation speed Nrm (see Figure 4) at which the outer tub 11 experiences a resonant mode of vibration in the front-to-rear direction, the phase difference between the left-to-right and up-to-down vibration phases of the outer tub 11 is significantly smaller than 90°; for example, in Figure 4, the phase difference is approximately 25°. Therefore, when the rotating drum 21 performs a spin-dry operation in the forward direction (left rotation), the outer tub 11 vibrates along an elliptical vibration locus that slopes upward to the right, spanning from the lower left region to the upper right region when viewed from the front of the clothing insertion opening 11op of the outer tub 11.
　このように、外槽１１の右上領域と左下領域が大きく首振り振動することが判明した。
外槽１１の前後方向の振動の共振モードでは、図６に示すように、外槽１１の先端側（衣類投入開口部１１ｏｐが形成されている側）の右上領域の右上部分と左下領域の左下部分が大きく前後に振動する首振り振動となる。一方、回転ドラム２１が逆転方向（右回転）で脱水運転を行う場合は、外槽１１の先端側の左上領域の左上部分と右下領域の右下部分が大きく首振り振動することになる。 Thus, it was found that the upper right and lower left areas of the outer tub 11 were subjected to large swinging vibrations.
In the resonance mode of vibration in the front-to-rear direction of the outer tub 11, the upper right part of the upper right region and the lower left part of the lower left region at the front end side (the side where the clothes insertion opening 11op is formed) of the outer tub 11 oscillate widely back and forth, as shown in Fig. 6. On the other hand, when the rotating drum 21 performs a spin-drying operation in the reverse direction (clockwise rotation), the upper left part of the upper left region and the lower right part of the lower right region at the front end side of the outer tub 11 oscillate widely.
　すなわち、外槽１１の前後方向の振動の共振モードでは、回転ドラム２１の回転方向が正転の場合は、右上部分と左下部分が大きく前後に振動する首振り振動となり、回転ドラム２１の回転方向が逆転の場合は、左上部分と右下部分が大きく前後に振動する首振り振動となる。この首振り運動によって、筐体及びドラム式洗濯機の設置床へ伝達される振動の増加を招くことになる。 In other words, in the resonance mode of the vibration in the front-to-back direction of the outer tub 11, when the rotating drum 21 rotates in the forward direction, the upper right and lower left parts vibrate back and forth in a large oscillating vibration, and when the rotating drum 21 rotates in the reverse direction, the upper left and lower right parts vibrate back and forth in a large oscillating vibration. This oscillating motion leads to an increase in the vibration transmitted to the housing and the floor on which the drum washing machine is installed.
　したがって、本実施形態では、この首振り振動を抑制する防振ダンパの配置構成を提案するものである。尚、防振ダンパは摩擦ダンパを使用しているが、オイルを封入したオイルダンパを使用しても良く、更には必要に応じて種々のダンパを使用することもできる。 Therefore, this embodiment proposes a vibration damper arrangement that suppresses this swaying vibration. Although a friction damper is used as the vibration damper, an oil damper filled with oil may also be used, and various other dampers may also be used as required.
　図７Ａ、図７Ｂは、外槽１１の首振り振動を含めて上下方向、左右方向の振動を抑制する防振ダンパ２４（４本使用）の配置構成を示している。ここで、図７Ａは外槽１１の正面の衣類投入開口部１１ｏｐの側から見た構成を示し、図７Ｂは外槽１１を側面から見た構成を示している。また、図７Ａでは、図５と同様に上下方向のＹ－Ｙ分割線と、これに直交する左右方向のＸ－Ｘ分割線を表示している。尚、以下では、回転ドラム２１を正転方向に回転させた場合について説明する。 Figures 7A and 7B show the arrangement of vibration dampers 24 (four dampers used) that suppress vertical and horizontal vibrations, including swaying vibrations, of the outer tub 11. Here, Figure 7A shows the configuration as seen from the side of the clothes insertion opening 11op on the front of the outer tub 11, and Figure 7B shows the configuration as seen from the side of the outer tub 11. Also, Figure 7A shows the Y-Y dividing line in the vertical direction and the X-X dividing line perpendicular to this in the horizontal direction, just like Figure 5. Note that the following will explain the case where the rotating drum 21 is rotated in the forward direction.
　図７Ａ、図７Ｂにおいて、外槽１１の右下領域の右下部分には、外槽１１の軸線（回転軸線Ａｚに相当）に沿って、外槽１１の前後方向に２本の防振ダンパ２４ａ、２４ｂが設けられている。外槽１１は、軸線方向で図７Ｂに示す外槽１１の中央線Ｃｃを境にして、前側領域と後側領域に分けることができる。そして、右前側防振ダンパ２４ａは、外槽１１の前側領域に取り付けられ、同様に右後側防振ダンパ２４ｂは、外槽１１の後側領域に取り付けられている。 In Figures 7A and 7B, two vibration dampers 24a, 24b are provided in the front-to-rear direction of the outer tub 11 along the axis of the outer tub 11 (corresponding to the rotation axis Az) in the lower right part of the lower right region of the outer tub 11. The outer tub 11 can be divided into a front region and a rear region in the axial direction, with the center line Cc of the outer tub 11 shown in Figure 7B as the boundary. The right front vibration damper 24a is attached to the front region of the outer tub 11, and similarly the right rear vibration damper 24b is attached to the rear region of the outer tub 11.
　防振ダンパ２４ａ、２４ｂの外槽１１との取付部（外槽側取付部）１１a、１１ｂと、防振ダンパ２４ａ、２４ｂの筐体１との取付部（筐体側取付部）１a、１ｂには、同じ取付形態で防振ダンパ２４ａ、２４ｂが取り付けられている。つまり、主に左右方向と上下方向の振動に対して防振ダンパ２４ａ、２４ｂが揺動できる状態で取り付けられている。 The vibration dampers 24a, 24b are attached in the same manner to the attachment parts (outer tank side attachment parts) 11a, 11b of the vibration dampers 24a, 24b to the outer tank 11, and to the attachment parts (casing side attachment parts) 1a, 1b of the vibration dampers 24a, 24b to the housing 1. In other words, the vibration dampers 24a, 24b are attached in a state where they can oscillate mainly in response to vibrations in the left-right and up-down directions.
　具体的には、外槽１１の取付部１１a、１１ｂと、筐体1の取付部１a、１ｂは、防振ダンパ２４ａ、２４ｂの両端を挟み込む、外槽１１の軸線に直交する方向に延びる一対のフランジを備えており、この一対のフランジの間に防振ダンパ２４ａ、２４ｂの両端を挟み、ボルトを挿通して固定している。 Specifically, the mounting parts 11a, 11b of the outer tub 11 and the mounting parts 1a, 1b of the housing 1 are provided with a pair of flanges extending in a direction perpendicular to the axis of the outer tub 11, which sandwich both ends of the vibration dampers 24a, 24b. Both ends of the vibration dampers 24a, 24b are sandwiched between the pair of flanges and fixed in place by inserting bolts.
　これによって、防振ダンパ２４ａ、２４ｂは、外槽１１の軸線に直交する平面上で振動に対してボルトを中心に揺動することができる。尚、右前側防振ダンパ２４ａの水平に対する取付角は「θａ」であり、右後側防振ダンパ２４ｂの取付角は「θｂ」であり、「θａ＜θｂ」の関係に設定されている。これらの取付角は、主に左右方向、上下方向の振動の作用方向や大きさによって適切に選択される。 This allows the vibration dampers 24a, 24b to swing about the bolt in response to vibrations on a plane perpendicular to the axis of the outer tub 11. The mounting angle of the right front vibration damper 24a relative to the horizontal is "θa", and the mounting angle of the right rear vibration damper 24b is "θb", with the relationship set to "θa < θb". These mounting angles are appropriately selected depending on the direction and magnitude of the vibrations, mainly in the left-right and up-down directions.
　同様に図７Ａ、図７Ｂにおいて、外槽１１の左下領域の左下部分には、外槽１１の軸線（回転軸線Ａｚに相当）に沿って前後方向に２本の防振ダンパ２４ｃ、２４ｄが設けられられている。そして、図７Ｂに示すように、軸線方向で外槽１１の中央線Ｃｃを境にして、左後側防振ダンパ２４ｃは、外槽１１の後側領域に取り付けられ、左前側防振ダンパ２４ｄは、外槽１１の前側領域に取り付けられている。 Similarly, in Figures 7A and 7B, two vibration dampers 24c, 24d are provided in the front-rear direction along the axis of the outer tub 11 (corresponding to the rotation axis Az) in the lower left part of the lower left region of the outer tub 11. As shown in Figure 7B, the left rear vibration damper 24c is attached to the rear region of the outer tub 11, and the left front vibration damper 24d is attached to the front region of the outer tub 11, with the center line Cc of the outer tub 11 as the boundary in the axial direction.
　左後側防振ダンパ２４ｃの外槽１１との取付部（外槽側取付部）１１ｃと、左後側防振ダンパ２４ｃの筐体１との取付部（筐体側取付部）１ｃは、先に説明した防振ダンパ２４ａ、２４ｂと同じ取付形態で取り付けられている。つまり、主に左右方向と上下方向の振動に対して左後側防振ダンパ２４ｃが揺動できる状態で取り付けられている。 The mounting portion (outer tank side mounting portion) 11c of the left rear vibration damper 24c to the outer tank 11 and the mounting portion (casing side mounting portion) 1c of the left rear vibration damper 24c to the housing 1 are attached in the same manner as the vibration dampers 24a and 24b described above. In other words, the left rear vibration damper 24c is attached in a state where it can oscillate mainly in response to vibrations in the left-right and up-down directions.
　具体的には、外槽１１の取付部１１ｃと、筐体1の取付部１ｃは、防振ダンパ２４ｃの両端を挟み込む、外槽１１の軸線に直交する方向に延びる一対のフランジを備えており、この一対のフランジの間に左後側防振ダンパ２４ｃの両端を挟み、ボルトを挿通して固定している。 Specifically, the mounting part 11c of the outer tub 11 and the mounting part 1c of the housing 1 are provided with a pair of flanges extending in a direction perpendicular to the axis of the outer tub 11, which sandwich both ends of the vibration damper 24c. Both ends of the left rear vibration damper 24c are sandwiched between the pair of flanges and fixed in place by inserting bolts.
　これによって、防振ダンパ２４ｃは、外槽１１の軸線に直交する平面上で振動に対してボルトを中心にして揺動することができる。尚、左後側防振ダンパ２４ｃの取付角は「θｃ」であり、「θａ＜θｂ＜θc」の関係に設定されている。これらの角度は、主に左右方向、上下方向の振動の作用方向や大きさによって適切に選択される。 This allows the vibration damper 24c to swing around the bolt in response to vibrations on a plane perpendicular to the axis of the outer tub 11. The mounting angle of the left rear vibration damper 24c is "θc", and is set to a relationship of "θa < θb < θc". These angles are appropriately selected depending on the direction and magnitude of the vibrations, mainly in the left-right and up-down directions.
　次に、左前側防振ダンパ２４ｄは、左後側防振ダンパ２４ｃに対して取り付け方向が９０°だけ回転された状態で取りけられている。つまり、左前側防振ダンパ２４ｄの外槽１１との取付部（外槽側取付部）１１ｄと、左前側防振ダンパ２４ｄの筐体１との取付部（筐体側取付部）１ｄは、先に説明した防振ダンパ２４ａ～２４ｃの側の外槽１１の側の取付部１１a～１１ｃ、及び筐体１の側の取付部１a～１ｃに対して、９０°だけ回転された状態で取り付けられている。言い換えれば、主に前後方向の首振り振動に対して左前側防振ダンパ２４ｄが揺動できる状態で取り付けられている。 Next, the left front vibration damper 24d is attached with its mounting direction rotated 90° relative to the left rear vibration damper 24c. In other words, the mounting portion (outer tub side mounting portion) 11d of the left front vibration damper 24d to the outer tub 11 and the mounting portion (casing side mounting portion) 1d of the left front vibration damper 24d to the housing 1 are attached in a state rotated 90° relative to the mounting portions 11a-11c on the outer tub 11 side of the vibration dampers 24a-24c described above, and the mounting portions 1a-1c on the housing 1 side. In other words, the left front vibration damper 24d is attached in a state where it can swing mainly in response to swinging vibrations in the front-to-rear direction.
　具体的には、外槽１１の取付部１１ｄと、筐体1の取付部１ｄは、防振ダンパ２４ｄの両端を挟み込む、外槽１１の軸線の方向に延びる一対のフランジを備えており、この一対のフランジの間に防振ダンパ２４ｄの両端を挟み、ボルトを挿通して固定している。これによって、左前側防振ダンパ２４ｄは、外槽１１の軸線に沿った平面上で、首振り振動に対してボルトを中心にして揺動することができる。 Specifically, the mounting part 11d of the outer tub 11 and the mounting part 1d of the housing 1 are provided with a pair of flanges extending in the axial direction of the outer tub 11 that sandwich both ends of the vibration damper 24d. Both ends of the vibration damper 24d are sandwiched between the pair of flanges and fixed by inserting a bolt. This allows the left front vibration damper 24d to swing around the bolt in response to the swaying vibration on a plane along the axis of the outer tub 11.
　ここで、外槽１１の側の取付部１１ｄと筐体１の側の取付部１ｄの配置位置は次の通りである。図７Ｂにあるように、外槽１１の取付部１１dは、外槽１１の前側領域の衣類投入開口部１１ｏｐの側に寄せて配置され、筐体１の取付部１ｄは、取付部１１ｄに比べて外槽１１の衣類投入開口部１１ｏｐより離れた位置に配置されている。この時の左前側防振ダンパ２４ｄの取付角は「θｄ」であり、この角度は、前後方向の振動の作用方向や大きさによって適切に選択される。 Here, the mounting portion 11d on the outer tub 11 side and the mounting portion 1d on the housing 1 side are positioned as follows. As shown in FIG. 7B, the mounting portion 11d of the outer tub 11 is positioned closer to the clothing insertion opening 11op in the front area of the outer tub 11, and the mounting portion 1d of the housing 1 is positioned farther away from the clothing insertion opening 11op of the outer tub 11 than the mounting portion 11d. At this time, the mounting angle of the left front vibration damper 24d is "θd", and this angle is appropriately selected depending on the direction and magnitude of the vibration in the front-rear direction.
　図５、図６で説明した通り、外槽１１の前後方向の振動の共振モードでは、外槽１１の右上部分と左下部分が大きく首振り振動する。そのため、外槽１１の軸線に沿って前後方向に傾斜した左前防振ダンパ２４ｄは、外槽１１の右下に配置するよりも左下に配置した方が外槽１１の首振り運動に対して、十分な減衰力を付与して前後方向の振動を抑制することができる。 As explained in Figures 5 and 6, in the resonance mode of the outer tub 11's forward/rearward vibration, the upper right and lower left parts of the outer tub 11 swing and vibrate greatly. Therefore, the left front vibration damper 24d, which is inclined in the forward/rearward direction along the axis of the outer tub 11, can provide sufficient damping force to the swinging motion of the outer tub 11 and suppress forward/rearward vibration by being placed at the lower left rather than the lower right of the outer tub 11.
　次に、図７Ａ、図７Ｂに示す防振ダンパ２４ａ～２４ｄの配置構成による設置床への振動伝達の影響について説明する。尚、防振ダンパ２４ａ～２４ｄのダンピング減衰性能は、どの配置位置においても同じ減衰性能とされている。 Next, we will explain the effect of vibration transmission to the installation floor due to the arrangement of the vibration dampers 24a to 24d shown in Figures 7A and 7B. Note that the damping performance of the vibration dampers 24a to 24d is the same regardless of the arrangement position.
　図３に示しているように、外槽１１の共振区間よりも高い回転数では、筐体１の共振区間（例えば、４５０r/min）が存在しているので、設置床への伝達力が上昇し、その後、回転数が上昇するにつれて設置床への伝達力が減少して振動が収束する。高速回転数領域においては、外槽１１の振動は防振ダンパ２４ａ～２４ｄの配置構成に依らず、一定の値に収束していく傾向にある。このため、外槽１１から設置床に伝達される振動は、防振ダンパ２４ａ～２４ｄ２４の減衰性能に依存し、防振ダンパ２４ａ～２４ｄの配置構成によらず同等の値に収束する。 As shown in Figure 3, at rotation speeds higher than the resonance range of the outer tub 11, the resonance range of the housing 1 (e.g., 450 r/min) exists, so the force transmitted to the installation floor increases, and then as the rotation speed increases, the force transmitted to the installation floor decreases and the vibration converges. In the high rotation speed range, the vibration of the outer tub 11 tends to converge to a constant value regardless of the arrangement of the vibration dampers 24a to 24d. For this reason, the vibration transmitted from the outer tub 11 to the installation floor depends on the damping performance of the vibration dampers 24a to 24d24, and converges to the same value regardless of the arrangement of the vibration dampers 24a to 24d.
　したがって、本実施形態で説明した防振ダンパ２４ａ～２４ｄ２の配置構成を用いることで、外槽１１の上下方向、左右方向に加えて前後方向の振動を効果的に抑制でき、更に設置床へと伝達される振動を効果的に抑制することができる。 Therefore, by using the arrangement of the vibration dampers 24a to 24d2 described in this embodiment, vibrations in the front-back direction as well as the up-down and left-right directions of the outer tank 11 can be effectively suppressed, and vibrations transmitted to the installation floor can also be effectively suppressed.
　次に、外槽１１の軸線に沿って前後方向に傾斜した左前側防振ダンパ２４ｄの配置について説明する。本実施形態では、電動モータ２２が外槽１１の後方に備えられることから、重心位置１１ｇが、外槽１１の中央線Ｃｃの後方に存在する場合について説明する。尚、一般的に電動モータ２２は、図２にあるように外槽１１の衣類投入開口部１１ｏｐの反対側に配置されている。 Next, the positioning of the left front vibration damper 24d, which is inclined in the front-rear direction along the axis of the outer tub 11, will be described. In this embodiment, since the electric motor 22 is provided at the rear of the outer tub 11, the center of gravity 11g is described as being located at the rear of the center line Cc of the outer tub 11. Generally, the electric motor 22 is located on the opposite side of the clothes insertion opening 11op of the outer tub 11, as shown in FIG. 2.
　外槽１１の首振り振動は、重心位置１１ｇよりも遠い位置（衣類投入開口部側）の方が大きく振動するため、外槽１１の後方よりも前方が大きく首振り振動が生じる。更に、衣類の偏りが回転ドラム２１の前方（衣類投入開口部側）にある場合は、後方（電動モータ側）にある場合と比較して、同じ条件ならば首振り振動の回転中心に対するモーメントアームが大きく首振り振動も大きくなることから、外槽１１との取付部１１ｄは前方（衣類投入開口部側）に取り付ける方が良い。 The oscillating vibration of the outer tub 11 is greater at positions farther away from the center of gravity 11g (closer to the clothing insertion opening), so the oscillating vibration is greater at the front than at the rear of the outer tub 11. Furthermore, when the clothes are biased towards the front of the rotating drum 21 (closer to the clothing insertion opening), the moment arm with respect to the center of rotation of the oscillating vibration is larger and the oscillating vibration is greater than when the clothes are biased towards the rear (closer to the electric motor) under the same conditions, so it is better to attach the attachment part 11d to the outer tub 11 at the front (closer to the clothing insertion opening).
　図８Ａ、図８Ｂは、外槽１１と左前側防振ダンパ２４ｄの配置位置の関係を示している。外槽１１の重心位置１１ｇに対して、取付部１１ｄを衣類投入開口部１１ｏｐに近づけた場合と、取付部１１ｄを外槽１１の重心位置１１ｇに近づけた場合と、近くに設けた場合について説明する。 Figures 8A and 8B show the relative positions of the outer tub 11 and the left front vibration damper 24d. We will explain the cases where the attachment part 11d is closer to the clothes insertion opening 11op relative to the center of gravity 11g of the outer tub 11, the cases where the attachment part 11d is closer to the center of gravity 11g of the outer tub 11, and the cases where it is located nearby.
　図８Ａに示すように、衣類投入開口部１１ｏｐに近づけて取付部１１ｄを設けた場合では、外槽１１の首振り振動の大きさに応じて左前側防振ダンパ２４ｄのストロークｄｘが大きくなり、減衰性能を発揮するため、効果的に外槽１１の首振り振動を抑制することができる。 As shown in FIG. 8A, when the mounting part 11d is provided close to the clothing insertion opening 11op, the stroke dx of the left front vibration damper 24d increases according to the magnitude of the oscillating vibration of the outer tub 11, and the damping performance is exerted, so that the oscillating vibration of the outer tub 11 can be effectively suppressed.
　一方、図８Ｂに示すように、重心位置１１ｇに近づけて取付部１１ｄを設けた場合では、図８Ａに比べてストロークｄｘが小さくなることに加えて、筐体１の取付部１ｄを中心に左前側防振ダンパ２４ｄが回転してしまい、外槽１１の首振り運動に対して減衰力を付与しにくいことから、図８Ａの配置位置に比べて減衰性能を十分に付与することはできない。もちろん、図８Ｂにおいても首振り運動を抑制することが可能であり、あくまでも相対的な比較である。 On the other hand, as shown in Figure 8B, when the mounting part 11d is provided closer to the center of gravity position 11g, not only is the stroke dx smaller than in Figure 8A, but the left front vibration damper 24d rotates around the mounting part 1d of the housing 1, making it difficult to provide a damping force against the oscillating motion of the outer tub 11, and therefore it is not possible to provide sufficient damping performance compared to the arrangement position in Figure 8A. Of course, it is also possible to suppress the oscillating motion in Figure 8B, so this is merely a relative comparison.
　このように、左前側防振ダンパ２４ｄの取付部１１ｄは、できるだけ衣類投入開口部１１ｏｐに近づけて設けた方が、更に効果的に外槽１１の首振り振動を抑制することができる。本実施形態における左前側防振ダンパ２４ｄの取付部１１ｄは、外槽11の前側領域の中央付近から外槽１１の衣類投入開口部１１ｏｐまでの間に配置しているが、最も好ましいのは衣類投入開口部１１ｏｐである。 In this way, the mounting portion 11d of the left front vibration damper 24d can be more effectively suppressed by locating it as close as possible to the clothing insertion opening 11op. In this embodiment, the mounting portion 11d of the left front vibration damper 24d is located between near the center of the front area of the outer tub 11 and the clothing insertion opening 11op of the outer tub 11, but most preferably at the clothing insertion opening 11op.
　ここで、左前側防振ダンパ２４ｄは、外槽１１の取付部１１ｄが外槽１１の後側、筐体１の取付部部１ｄが外槽１１の前側となるように取り付けた場合では、左前側防振ダンパ２４ｄは、主に取付接続部１１ｄを中心とした回転が生じ、首振り運動に対して減衰力を付与し難くなるので、図８Ａ、図８Ｂのように、外槽１１の取付部１１ｄが前側、筐体１の取付部１ｄが後側となるように、左前側防振ダンパ２４ｄを取り付ける方が望ましい。 If the left front vibration damper 24d is attached so that the mounting part 11d of the outer tub 11 is at the rear side of the outer tub 11 and the mounting part 1d of the housing 1 is at the front side of the outer tub 11, the left front vibration damper 24d will rotate mainly around the mounting connection part 11d, making it difficult to apply damping force to the oscillating movement. Therefore, it is preferable to attach the left front vibration damper 24d so that the mounting part 11d of the outer tub 11 is at the front side and the mounting part 1d of the housing 1 is at the rear side, as shown in Figures 8A and 8B.
　また、外槽１１に錘を取り付ける構成が採用された場合は、外槽１１の重心位置１１ｇが、外槽１１の中央線Ｃｃの前側に存在することがある。この場合は、図７Ｂに示されている左前側防振ダンパ２４ｄは、左後側防振ダンパ２４ｃに置き換わり、左後側防振ダンパ２４ｃは、左前側防振ダンパ２４ｄに置き換わることになる。また、この場合は、左前側防振ダンパ２４ｄの傾きの方向は逆方向となる。 Furthermore, if a configuration is adopted in which a weight is attached to the outer tub 11, the center of gravity 11g of the outer tub 11 may be located in front of the center line Cc of the outer tub 11. In this case, the left front vibration damper 24d shown in FIG. 7B is replaced with the left rear vibration damper 24c, and the left rear vibration damper 24c is replaced with the left front vibration damper 24d. In this case, the inclination direction of the left front vibration damper 24d is also reversed.
　次に、図７Ａに示す左右方向に傾斜させて取り付けた防振ダンパ２４ａ～２４ｃについて説明する。 Next, we will explain the vibration dampers 24a to 24c that are installed with an inclination in the left-right direction as shown in Figure 7A.
　外槽１１の衣類投入開口部１１ｏｐを正面から見た平面視において、防振ダンパ２４ａ～２４ｃは、それぞれ左右方向に角度θa～θcに傾斜した姿勢（水平面を０°とする）で取り付けられることで、主に左右方向と上下方向の共振による振動を抑制することができる。 In a plan view of the front of the clothing insertion opening 11op of the outer tub 11, the vibration dampers 24a to 24c are installed with inclinations at angles θa to θc in the left-right direction (the horizontal plane is 0°), which makes it possible to suppress vibrations caused by resonance mainly in the left-right and up-down directions.
　防振ダンパ２４ｃは外槽１１の左側に備えられ、防振ダンパ２４ａと防振ダンパ２４ｂは右側に備えられ、外槽１１を支持する構成となっている。上述の通り、外槽１１の右下領域よりも左下領域が大きく振動するため、防振ダンパ２４の減衰力は右下側よりも左下側をより強くする方が望ましい。 Anti-vibration damper 24c is provided on the left side of outer tub 11, and anti-vibration dampers 24a and 24b are provided on the right side, and are configured to support outer tub 11. As mentioned above, the lower left region of outer tub 11 vibrates more than the lower right region, so it is desirable to make the damping force of anti-vibration damper 24 stronger on the lower left side than on the lower right side.
　図５で説明した通り、外槽１１の前後方向の共振モードの回転数付近では、右肩上がりに傾斜した楕円形の振動軌跡で首振り振動するため、外槽１１のＹ-Ｙ分割線の右側は、左右方向の振動より上下方向の振動が大きくなる。そのため、外槽１１のＹ-Ｙ分割線の右側に配置される防振ダンパ２４ａ、防振ダンパ２４ｂの姿勢角度θaとθｂのどちらか一方は「４５°以上に傾斜させると、更に上下方向の振動を抑制することができる。 As explained in Figure 5, when the outer tub 11 is near the rotation speed of the front-to-rear resonance mode, it oscillates along an elliptical vibration locus that slopes upward to the right, so that on the right side of the Y-Y dividing line of the outer tub 11, the vertical vibration is greater than the left-to-right vibration. Therefore, if either one of the attitude angles θa and θb of the anti-vibration dampers 24a and 24b, which are located on the right side of the Y-Y dividing line of the outer tub 11, is tilted by 45° or more, the vertical vibration can be further suppressed.
　以上に説明した防振ダンパ２４の配置は一例であって、これに限定されるべきものではない。例えば、前後方向に傾斜した左前側防振ダンパ２４ｄは１本ではなく、複数の防振ダンパ２４ｄを備えていても良い。また、左後側防振ダンパ２４ｃも、前後に傾斜させて取り付けることで前後方向の振動の減衰力を増やすことができ、首振り振動をさらに抑制する構成となる。 The above-described arrangement of the vibration dampers 24 is an example and should not be considered limiting. For example, the front left vibration damper 24d inclined in the front-to-rear direction may be provided with multiple vibration dampers 24d rather than a single one. In addition, the rear left vibration damper 24c may also be installed with an incline in the front-to-rear direction to increase the damping force of vibration in the front-to-rear direction, resulting in a configuration that further suppresses swaying vibration.
　ここで、上述した実施形態では、回転ドラム２１が正転（左回転）する例を説明したが、ドラム２１が逆転（右回転）する場合は、本実施例の防振ダンパの配置に対して左右方向の関係が逆になるようにすれば良く、前後方向の振動を抑制する左前側防振ダンパ２４ｄを右下領域に配置すれば良い。 In the above embodiment, an example was described in which the rotating drum 21 rotates forward (left), but if the drum 21 rotates in the reverse direction (right), the left-right relationship should be reversed with respect to the arrangement of the vibration dampers in this embodiment, and the left front vibration damper 24d, which suppresses vibrations in the front-to-rear direction, should be placed in the lower right area.
　尚、本発明は上記したいくつかの実施形態に限定されるものではなく、様々な変形例が含まれる。上記の実施形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、ある実施形態の構成に他の実施形態の構成を加えることも可能である。各実施形態の構成について、他の構成の追加、削除、置換をすることも可能である。 The present invention is not limited to the above-mentioned embodiments, but includes various modified examples. The above-mentioned embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace other configurations with respect to the configuration of each embodiment.
　１…筐体、１ａ～1ｄ…筐体と防振ダンパの取付部、１１…外槽、１１ａ～１１ｄ…外槽と防振ダンパの取付部、１１ｏｐ…外槽の衣類投入開口部、２１…回転ドラム、２４ａ～２４ｄ…防振ダンパ、１００…ドラム式洗濯機 1...Housing, 1a-1d...Mounting parts of the housing and the vibration damper, 11...Outer tub, 11a-11d...Mounting parts of the outer tub and the vibration damper, 11op...Clothes insertion opening of the outer tub, 21...Rotary drum, 24a-24d...Vibration damper, 100...Drum-type washing machine

Claims (5)

  1. 　筐体と、前記筐体内に支持され内部に洗濯水を貯留可能な外槽と、前記外槽に内包され電動モータで回転される回転ドラムと、前記外槽の下部と前記筐体の底部とを連結する複数の防振ダンパを備えたドラム式洗濯機であって、
    　前記ドラム式洗濯機が設置床に設置された状態で前記外槽の衣類投入開口部を正面から見た平面視において、前記衣類投入開口部の中心を通る重力方向の分割線を仮想的に設定したとき、前記複数の防振ダンパの少なくとも一つの防振ダンパは、
    　前記回転ドラムの脱水運転時の回転方向が左回転の場合は、前記分割線の左側の領域に設置され、前記回転ドラムの脱水運転時の回転方向が、右回転の場合は前記分割線の右側の領域に設置され、
    　更に、前記一つの防振ダンパと前記外槽との外槽側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部の側に寄せて配置され、前記一つの防振ダンパと前記筐体との筐体側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部から前記外槽側取付部より離れて配置されている
    ことを特徴とするドラム式洗濯機。     A drum-type washing machine including a housing, an outer tub supported within the housing and capable of storing wash water therein, a rotary drum contained within the outer tub and rotated by an electric motor, and a plurality of vibration dampers connecting a lower portion of the outer tub to a bottom of the housing,
    When the drum-type washing machine is installed on an installation floor and the clothes insertion opening of the outer tub is viewed from the front in a plan view, a gravity direction dividing line passing through the center of the clothes insertion opening is virtually set. At least one of the plurality of vibration dampers is
    When the rotation direction of the rotating drum during the dehydration operation is counterclockwise, the rotating drum is installed in the area to the left of the dividing line, and when the rotation direction of the rotating drum during the dehydration operation is clockwise, the rotating drum is installed in the area to the right of the dividing line,
    Further, the drum-type washing machine is characterized in that an outer-tub side mounting portion between the one vibration damper and the outer tub is positioned closer to the clothing insertion opening when viewed in the axial direction of the outer tub, and a housing side mounting portion between the one vibration damper and the housing is positioned farther from the clothing insertion opening than the outer-tub side mounting portion when viewed in the axial direction of the outer tub.
  2. 　請求項１に記載のドラム式洗濯機であって、
    　前記外槽の軸線方向で見て、前記筐体側取付部は、前記外槽側取付部より前記外槽の重心に近づけて配置されている
    ことを特徴とするドラム式洗濯機。     The drum type washing machine according to claim 1,
    A drum-type washing machine, characterized in that, when viewed in the axial direction of the outer tub, the housing-side mounting portion is arranged closer to the center of gravity of the outer tub than the outer tub-side mounting portion.
  3. 　請求項１、又は請求項２に記載のドラム式洗濯機であって、
    　前記一つの防振ダンパとは別の他の一つの防振ダンパは、前記回転ドラムの脱水運転時の回転方向が左回転の場合は、前記分割線の右側の領域に設置され、前記回転ドラムの脱水運転時の回転方向が、右回転の場合は前記分割線の左側の領域に設置され、
    　更に、前記他の一つの防振ダンパは、前記外槽の軸線方向に直交する方向で、前記外槽との前記外槽側取付部と前記筐体との前記筐体側取付部の間に設置され、しかもその取付角度が４５°以上に設定されている
    ことを特徴とするドラム式洗濯機。     The drum type washing machine according to claim 1 or 2,
    Another vibration damper different from the one vibration damper is installed in an area to the right of the dividing line when the rotation direction of the rotating drum during a dehydration operation is counterclockwise, and is installed in an area to the left of the dividing line when the rotation direction of the rotating drum during a dehydration operation is clockwise,
    Furthermore, the other vibration damper is installed between the outer tub side mounting portion with the outer tub and the housing side mounting portion with the housing in a direction perpendicular to the axial direction of the outer tub, and the mounting angle is set to 45° or more.
  4. 　筐体と、前記筐体内に支持され内部に洗濯水を貯留可能な外槽と、前記外槽に内包され電動モータで回転される回転ドラムと、前記外槽の下部と前記筐体の底部とを連結する４本の防振ダンパを備えたドラム式洗濯機であって、
    　前記ドラム式洗濯機が設置床に設置された状態で前記外槽の衣類投入開口部を正面から見た平面視において、前記衣類投入開口部の中心を通る重力方向の分割線を仮想的に設定したとき、
    　４本の前記防振ダンパは、前記分割線を境にして右側の領域に前記外槽の軸線方向に沿って第１防振ダンパと第２防振ダンパが設置され、前記分割線を境にして左側の領域に前記外槽の軸線方向に沿って第３防振ダンパと第４防振ダンパが設置されると共に、前記第１防振ダンパと前記第４防振ダンパは前記衣類投入開口部の側に寄せて配置され、
    　前記回転ドラムの脱水運転時の回転方向が左回転の場合は、前記第４防振ダンパと前記外槽との外槽側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部の側に寄せて配置され、前記第４防振ダンパと前記筐体との筐体側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部から前記外槽側取付部より離れて配置され、
    　前記第１防振ダンパ、前記第２防振ダンパ、及び前記第３防振ダンパは、前記外槽の軸線方向に直交する方向で、前記外槽との前記外槽側取付部と前記筐体との前記筐体側取付部の間に設置され、
    　前記回転ドラムの脱水運転時の回転方向が右回転の場合は、前記第１防振ダンパと前記外槽との外槽側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部の側に寄せて配置され、前記第１防振ダンパと前記筐体との筐体側取付部は、前記外槽の軸線方向で見て、前記衣類投入開口部から前記外槽側取付部より離れて配置され、
    　前記第２防振ダンパ、前記第３防振ダンパ、及び前記第４防振ダンパは、前記外槽の軸線方向に直交する方向で、前記外槽の前記外槽側取付部と前記筐体の前記筐体側取付部の間に設置されている、
    ことを特徴とするドラム式洗濯機。     A drum-type washing machine including a housing, an outer tub supported within the housing and capable of storing wash water therein, a rotary drum contained within the outer tub and rotated by an electric motor, and four vibration dampers connecting a lower portion of the outer tub to a bottom of the housing,
    When the drum type washing machine is installed on an installation floor and the clothes insertion opening of the outer tub is viewed from the front in a plan view, a division line in the gravity direction passing through the center of the clothes insertion opening is virtually set,
    The four vibration dampers are arranged such that a first vibration damper and a second vibration damper are arranged along the axial direction of the outer tub in the area on the right side of the dividing line, and a third vibration damper and a fourth vibration damper are arranged along the axial direction of the outer tub in the area on the left side of the dividing line, and the first vibration damper and the fourth vibration damper are arranged close to the clothes insertion opening,
    When the rotation direction of the rotating drum during the dehydration operation is counterclockwise, an outer-tub side mounting portion between the fourth vibration damper and the outer tub is disposed closer to the clothing insertion opening when viewed in the axial direction of the outer tub, and a housing side mounting portion between the fourth vibration damper and the housing is disposed farther from the clothing insertion opening than the outer-tub side mounting portion when viewed in the axial direction of the outer tub.
    the first vibration damper, the second vibration damper, and the third vibration damper are installed between the outer tank side mounting portion with the outer tank and the housing side mounting portion with the housing in a direction perpendicular to the axial direction of the outer tank,
    When the rotation direction of the rotating drum during the dehydration operation is clockwise, an outer-tub side mounting portion between the first vibration damper and the outer tub is disposed closer to the clothing insertion opening when viewed in the axial direction of the outer tub, and a housing side mounting portion between the first vibration damper and the housing is disposed farther away from the clothing insertion opening than the outer-tub side mounting portion when viewed in the axial direction of the outer tub.
    The second vibration damper, the third vibration damper, and the fourth vibration damper are installed between the outer tank side mounting portion of the outer tank and the housing side mounting portion of the housing in a direction perpendicular to the axial direction of the outer tank.
    A drum type washing machine characterized by the above.
  5. 　請求項４に記載のドラム式洗濯機であって、
    　前記回転ドラムが左回転の場合においては、前記分割線に直交する方向を基準とした前記第１防振ダンパ、前記第２防振ダンパ、及び前記第３防振ダンパの取付角がそれぞれ異なっている
    ことを特徴とするドラム式洗濯機。     The drum type washing machine according to claim 4,
    A drum-type washing machine characterized in that, when the rotating drum rotates counterclockwise, the mounting angles of the first vibration damper, the second vibration damper, and the third vibration damper based on the direction perpendicular to the dividing line are each different.
PCT/JP2023/023895 2022-10-28 2023-06-28 Drum washing machine WO2024089938A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028290A (en) * 2007-07-27 2009-02-12 Panasonic Corp Washing machine
US20110023554A1 (en) * 2009-07-31 2011-02-03 Bsh Home Appliances Corporation Damping system for a household appliance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028290A (en) * 2007-07-27 2009-02-12 Panasonic Corp Washing machine
US20110023554A1 (en) * 2009-07-31 2011-02-03 Bsh Home Appliances Corporation Damping system for a household appliance

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