JP2002200391A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine interrupting the vibration transmission force occurring at a spin-drying operation and reducing the vibration to a floor with a simple structure. SOLUTION: A suspension spring mechanism suspending an outer tub 2 from the upper section of a frame 3 is formed with suspension springs 4 suspending the outer tub 2 and pantograph-shaped link mechanisms 20 arranged around the suspension springs 4 to perform a pantograph operation as the suspension springs 4 are expanded and shrunk. An additional inertial body 15 is attached on a rod 12a constituting the link members of each link mechanism 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducer for a washing machine such as a drum type washing and drying machine.

[0002]

2. Description of the Related Art A conventional drum type washing machine has a structure in which an outer tub is supported by a suspension spring from an upper portion of a frame and a damper from a lower portion of the frame. During the dehydration operation, the centrifugal force of the laundry stuck to the inner tub that is rotating at a high speed inside the outer tub becomes the excitation force, vibrates the outer tub, and a suspension spring that supports the outer tub and A large vibration transmission force is applied to the floor via the damper.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 6-154472, there has been proposed a device having a damper for changing a frictional force depending on the size of a stroke.

Japanese Patent Application Laid-Open No. Hei 9-177775 discloses a vibration isolating connection mechanism for isolating vibration to the floor, as shown in FIG. A mechanism using an additional inertial body has been proposed.

[0005]

However, the above-mentioned Japanese Patent Application Laid-Open No.
In the washing machine described in 154472, the damper force at the time of the small amplitude stroke during the spin-drying operation is reduced, and the vibration transmission force by the damper becomes smaller than before, but the vibration transmission force by the spring is not reduced. However, it is difficult to sufficiently reduce the vibration transmission force to the floor.

In addition, the vibration isolation connection mechanism described in Japanese Patent Application Laid-Open No. Hei 9-177875 requires a rack, a pinion, and a casing for fixing the rotation shaft of the pinion, and the configuration is complicated.

[0007] In the vibration isolation connection mechanism described in FIG. 9 of Japanese Patent Application Laid-Open No. Hei 9-177775, one end of a link mechanism in which two rods are rotatably connected is connected to a vibration side structure B (or a vibration side structure). A connection mechanism rotatably connected to the body B) and allowing a rotation shaft connecting the rods of the link mechanism to be linearly movable to the vibration-side structure A (or the vibration-side structure A); This is a mechanism for rotatably connecting the other end of the link mechanism to the additional inertial body. Therefore, a guide member for connecting the rotating shafts connecting the rods so as to be movable in a straight line is required, and the configuration becomes complicated. In addition, unnecessary frictional force is generated with respect to the linear motion of the rotating shaft, and the additional inertial body protrudes outside the frame, resulting in a spatial problem.

It is an object of the present invention to provide a washing machine which has a simple structure, and which interrupts a vibration transmitting force generated at the time of a spin-drying operation to reduce vibration to the floor.

[0009]

In order to achieve the above object, a feature of the washing machine according to the present invention is that a suspension spring mechanism for suspending and supporting an outer tub by suspending from an upper portion of a frame includes a suspension spring, A pantograph-shaped link mechanism that is arranged around the suspension spring and performs a pantograph operation in accordance with expansion and contraction of the suspension spring is provided, and an additional inertia member is provided on a rod constituting a link member of the link mechanism.

Specifically, the present invention provides the following washing machines.

The present invention provides a frame, an outer tub for holding water during washing, a suspension spring mechanism for suspending and supporting the outer tub from above the frame, and holding the outer tub from below the frame. In a washing machine having a damper, the suspension spring mechanism includes a suspension spring that suspends the outer tub,
A pantograph-shaped link mechanism disposed around the suspension spring and performing a pantograph operation in accordance with expansion and contraction of the suspension spring, wherein the link mechanism is formed by rotatably connecting two rods to each other. A link member disposed substantially symmetrically with respect to the direction of expansion and contraction of the spring, and an additional inertia member provided on the rod, both ends of each of the link members are rotatably connected to the outer tub and the frame. A washing machine is provided.

[0012] Preferably, a beam is provided at the root of both hooks of the suspension spring, and both ends of each link member are rotatably supported by the beam.

[0013] Preferably, a connecting rod rotatably connected to the outer tub and the suspension spring mechanism is provided between the outer tub and the suspension spring mechanism.

The present invention also relates to a washing machine having a frame, an outer tub for holding water during washing, and a suspension spring mechanism for suspending and supporting the outer tub from above the frame. Has a suspension spring that suspends the outer tub, and a pantograph-shaped link mechanism that is arranged around the suspension spring and performs a pantograph operation in accordance with expansion and contraction of the suspension spring. The link mechanism includes two rods. And a link member formed so as to be rotatable with each other and arranged substantially symmetrically with respect to the direction of expansion and contraction of the suspension spring. A washing machine comprising: a supporting beam; an additional inertia member provided on the rod; and a variable damper rotatably provided on the beam and suppressing movement of the rod. Subjected to.

Preferably, the variable damper includes a pin provided on the rod, a U-shaped rotator formed so as to sandwich the pin with a gap from the pin, and provided on the beam. A rotating shaft that rotatably supports the rotating body, and when the rod largely swings with the expansion and contraction of the suspension spring, the pin is applied to the inside of the U-shape to increase the size of the rod. It is configured to suppress swinging.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a washing machine according to an embodiment of the present invention will be described with reference to the drawings.

First, the configuration of a vibration system of a general drum type washing machine will be described with reference to FIG.

As shown in FIG. 12, a porous inner tub 1 containing laundry and rotating about a horizontal axis is supported by a bearing.
The outer tub 2 that holds water during washing includes a plurality of suspension springs 4 from the upper part of the frame 3 and a friction damper 5 from the lower part of the frame 3.
And the frame 3 supports the bellows 11 from the front.

The driving force of the motor 6 attached to the lower part of the outer tub 2 is transmitted by the belt 7 and the pulley 8 to rotate the inner tub 1. The vibration source of the outer tub 2 is the centrifugal force generated by the unbalanced laundry in the inner tub 1, and is transmitted through a bearing that rigidly supports the inner tub 1. The vibration of the outer tub 2 is transmitted to the frame 3 by the suspension spring 4, the damper 5 and the bellows 11, and finally transmitted to the floor 10 through the legs 9.

The washing machine of the present invention includes a suspension spring 4 connecting the outer tub 2 and the frame 3, and an inertial body provided around the suspension spring 4 and operated by the relative movement between the outer tub 2 and the frame 3. The suspension spring mechanism is configured to suppress a large vibration transmitting force during the dewatering operation.

FIG. 1 is a sectional view of a drum type washing machine according to an embodiment of the present invention as viewed from a side. FIG.
FIG. 2 is an enlarged view of a suspension spring mechanism of the washing machine in FIG. 1.

As shown in FIGS. 1 and 2, the suspension spring mechanism includes a suspension spring 4 supporting the outer tub 2 from above the frame 3 and a suspension spring 4 arranged around the suspension spring 4 for expansion and contraction of the suspension spring 4. Accordingly, a link mechanism 20 having a pantograph shape for performing a pantograph operation is provided.

The link mechanism 20 is arranged so as to be substantially symmetrical with respect to the direction in which the suspension spring 4 expands and contracts, and rotates the link member connecting the two rods 12a and 12b rotatably about the rotation shaft 14 to some extent. In this state, one end is connected to the connection point 17 a of the frame 3 and the other end is connected to the connection point 17 of the outer tank 2.
7b are rotatably connected to each other, and an additional inertia body 15 is provided on the rod 12a.

The rod 1 depends on the distance between the connection points 17a and 17b between the frame 3 of the link mechanism 20 and the outer tub 2.
The attachment angle formed between the frame 2a and the frame 3 and between the rod 12b and the outer tub 2 changes, and the two additional inertia bodies 15 perform an operation of expanding or contracting.

The inertial force accompanying the operation of the additional inertial body 15 cancels out the expansion and contraction force of the spring generated by the relative vertical movement between the outer tub 2 and the frame 3, and can interrupt the transmission of vibration to the frame 3. .

Further, by arranging the two additional inertia bodies 15 symmetrically with respect to the suspension spring 4, the inertial force accompanying the operation of the additional inertia bodies 15 acts symmetrically on the frame 3 to rotate the frame 3. The power will be countered.

That is, by arranging the rods 12a and 12b and the additional inertia body 15 symmetrically with respect to the suspension spring 4, and forming a pantograph-shaped link mechanism 20 having the additional inertia body 15, the distance between the suspension spring 4 Vibration isolation can be easily and effectively performed with a compact configuration that can be accommodated in the above manner.

In the embodiment of the present embodiment, the outer tank 2
Is shown in the case where the number of the suspension springs 4 is four, but the suspension spring mechanism is similarly applied to each suspension spring 4 when the number of the suspension springs 4 is supported by three or two. it can.

FIGS. 3 and 4 show a swirl-type washing machine according to another embodiment of the present invention. FIG. 3 shows the inside of the washing machine from the side, and FIG. 4 shows the washing machine from the top.

In the washing machine having the outer tub 2 supported by the hanging rods 40 and the springs 4 from the frame 3, a pantograph link mechanism having an additional inertia body 15 is arranged on the springs 4. The vibration of the outer tub 2 expands and contracts a spring 41 below a bracket 42 provided on the outer tub 2, and gives a reaction force to a spring receiver 43 provided on the suspension rod 40. By connecting to the bracket 42 and the spring receiver 43 by a pantograph-shaped link mechanism having the additional inertial body 15,
The transmission of vibration to the spring receiver 43 is suppressed, and the suspension rod 40,
Vibration to the floor transmitted through the frame 3 and the rubber legs 9 is suppressed.

FIG. 5 shows still another embodiment of the present invention, and shows only the structure of the suspension spring mechanism.

As shown in FIG. 5, beams 16a, 16b are fixed to the roots of both hooks 19a, 19b of the suspension spring 4, and two rods 12a, 12b are provided between the beams 16a, 16b.
b is rotatably connected to a rotation member 14 around a rotation axis 14, and one end thereof is connected to a beam 16 a
And the other end is rotatably connected to the beam 16b, and an additional inertia body 15 is provided at the tip of the rod 12a. As described above, by integrating the suspension spring 4 and the pantograph-shaped link mechanism having the additional inertia body 15, handling is easy when the suspension spring mechanism is attached to the frame 3 and the outer tub 2.

The breaking characteristics of the pantograph-shaped link mechanism having the additional inertial body shown in FIGS. 1 and 2 will be analyzed and explained based on the vibration system model shown in FIG.

In FIG. 6, a vibrating body 21 (mass MD) is connected to a vibrating body 21 of mass MF via a spring 22 having an elastic coefficient K and a pantograph-shaped link mechanism having an additional inertia body according to the present invention. 23 (frame), the vibrating body 23 is supported on a floor 25 by a spring 24 (leg) having an elastic coefficient KF, and the vibrating bodies 21 and 23 have one degree of freedom of movement and operate only in the vertical direction.

The rod 27a of length lA constituting the link mechanism is provided with two additional inertia bodies 26 having a mass of m / 2 at the tip thereof.
b and rotatably connected.

If the connection distance of the link mechanism is x, the lateral movement distance of the additional inertia body is y, and the connection distance in the equilibrium state where the spring force and the gravitational force of the vibrating body 21 are balanced is xO, this equilibrium state is obtained. Considering a small change from, the change amount of y with respect to the change amount of x, A = dy / dx, is expressed by the following equation
Becomes

[0037]

(Equation 1) Further, here, using (Equation 1), the equivalent inertia ms of the additional inertial body is defined as the following equation (Equation 2).

[0038]

(Equation 2) When the equivalent inertia ms, the displacement of the vibrating body 21 is x1, the displacement of the vibrating body 23 is x2, and the exciting force to the vibrating body 21 is F, the equation of motion for the vibrating bodies 21 and 23 in FIG.
(Equation 3)

[0039]

(Equation 3) From the equation of motion shown in (Equation 3), the excitation angular frequency is expressed as ω [rad /
s] leads to the transfer characteristic | X2 / X1 | from x1 to x2.
The following equation (Equation 4) is obtained.

[0040]

(Equation 4) The cutoff angular frequency ωS [rad / at which the transfer characteristic shown in (Equation 4) becomes 0
s] is given by the following equation (Equation 5).

[0041]

(Equation 5) When the transfer characteristic is 0, the vibration of the vibrating body 21 vibrated at the frequency represented by (Equation 5) is not transmitted to the vibrating body 23, and the vibration transmitting force to the floor is also 0.

Therefore, by setting the angular frequency (vibration cutoff frequency) at which the vibration transmission characteristic becomes 0 to be close to the rotational angular frequency during the spin-drying operation of the drum type washing machine, the rotational angular frequency during the spin-drying operation is set. The vibration of the outer tub, which is vibrated by the above, is hardly transmitted to the frame, and reduces the vibration transmitting force to the floor.

Here, as an analysis example, the horizontal axis represents the dimensionless angular frequency and the vertical axis represents the vibration transmissibility, and the relationship between the excitation angular frequency and the vibration transmissibility depending on the presence or absence of the vibration isolation connection mechanism of the present invention is shown. FIG. When the vibration cutoff connection mechanism shown in FIG. 7 is provided, the dimensionless angular frequency ω / ωS is 1.0, that is, when the excitation angular frequency is the angular frequency ωS shown in (Expression 5), the vibration transmissibility is very high. It turns out that it becomes small.

Accordingly, the configuration of the pantograph-shaped link mechanism having the additional inertia body, that is, the magnitude of the additional inertia,
The breaking angle frequency shown in (Formula 5) determined by the magnitude of elasticity supporting the outer tank, the length of the rod forming the link mechanism, the distance to the additional inertia body, and the connection distance of the breaking connection mechanism in the equilibrium state The vibration of the vibrating body 23 (frame) is suppressed by setting ωS to around the rotation angular frequency of the inner tub that rotates by enclosing the laundry inside the outer tub during the spin-drying operation. Can be reduced.

FIG. 8 shows still another embodiment of the present invention, and is a front view showing a cross section of a drum type washing machine to which a pantograph-shaped link mechanism having an additional inertia body is connected.

A connecting rod 18 rotatably connected to one connecting end of the link mechanism 20 is provided, and the other end of the link mechanism 20 is rotatably connected to the frame 3 and the other end of the connecting rod 18 is rotatably connected to the outer tub 2. It is a washing machine.

The pantograph-shaped link mechanism 20 having the additional inertia body 15 performs a rigid pendulum motion in response to the horizontal vibration of the outer tub 2, and an inertia force acts at a connection point 17 a with the frame 3. . The inertial force causes the frame 3 to vibrate and acts to give a vibration transmitting force to the floor.

Therefore, by providing the connecting rod 18, the link mechanism 20 does not directly receive the lateral vibration of the outer tub 2,
The lateral vibration of the outer tub 2 can be isolated. Therefore, the lateral vibration of the link mechanism 20 itself is reduced, and the inertial force acting on the connection point 17a described above can be reduced.
Vibration transmission force to the floor can be reduced.

Further, the connection point 17b with the connecting rod 18 that gives vibration to the link mechanism 20 is connected to the link mechanism 20.
By selecting near the center of the impact corresponding to the upper connection point 17a, the component of the force transmitted from the connection point 17a to the frame 3 orthogonal to the axis of the link mechanism 20 can be reduced.

FIG. 9 shows still another embodiment of the present invention, in which a pantograph-shaped link mechanism having an additional inertia body is arranged in the suspension spring 4, and the operation of a rod forming the link mechanism is controlled. A variable damper 30 is provided.

FIG. 10 shows the variable damper 3 shown in FIG.
FIG. 2 is a cross-sectional view of a portion constituting 0 as viewed from the side. 9 and 10, the pin 31
The rotating body 33 attached to the rod 12a and cut so as to sandwich the pin 31 is rotatably connected to the rotating shaft 32 of the beam 16a.

The width of the cut of the rotating body 33 is larger than the diameter of the pin 31, and the rotating body 33 has a play with the rod 12.
The rotation operation follows the operation of a. The rotational friction force between the rotating body 33 and the beam 16a is set to a value sufficiently larger than the rotational friction force of the rod 12a.

Thus, when the displacement vibration of the outer tank 2 is large, the deformation of the pantograph shape is also large, and the rod 1
The vibration of the pin 31 accompanying the operation of 2a is not contained within the play of the cut in the rotating body 33 and tends to increase,
The vibration is suppressed by receiving the frictional force between the rotating body 33 and the beam 16a.

When the displacement vibration of the outer tub 2 is small,
The deformation of the pantograph shape is also small, and most of the vibration of the pin 31 due to the operation of the rod 12a is settled within the play of the notch in the rotating body 33, and the rotating body 33 is hardly rotated. The generation of acting force is suppressed, and the transmission force to the floor is reduced.

During the dewatering operation, the displacement amplitude of the outer tub 2 is small, so that the variable damper 30 is not affected by the operation of the rod forming the pantograph-shaped link mechanism 20 having the additional inertia body 15.
The transmission force to the floor can be suppressed by suppressing the generation of the frictional force by disposing.

FIG. 11 is a sectional view of a drum type washing machine to which the suspension spring mechanism shown in FIG. 9 is applied. A pantograph-shaped link mechanism 20 having a variable damper 30 and an additional inertia body 15 allows a friction damper 5 (not shown) supported at a lower portion of the outer tub 2 to be removed. Can be wider.

[0057]

According to the present invention, the vibration transmitting force generated during the spin-drying operation is interrupted with a simple structure, and the vibration to the floor is reduced, so that the washing machine can be made quieter and more compact. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a drum type washing machine according to an embodiment of the present invention as viewed from a side.

FIG. 2 is an enlarged view of a suspension spring mechanism of the washing machine of FIG.

FIG. 3 is a cross-sectional view of a spiral washing machine according to another embodiment of the present invention, as viewed from a side.

FIG. 4 is a top view of the washing machine of FIG. 3;

FIG. 5 is an enlarged view of a suspension spring mechanism of a drum type washing machine according to still another embodiment of the present invention.

FIG. 6 is a vibration analysis model diagram.

FIG. 7 is a diagram showing a vibration transmission characteristic of the washing machine.

FIG. 8 is a cross-sectional view of a drum type washing machine according to still another embodiment of the present invention as viewed from the front.

FIG. 9 is an enlarged view of a suspension spring mechanism of a drum type washing machine according to still another embodiment of the present invention, and is a view in which a variable damper is provided.

10 is a cross-sectional view of the variable damper 30 of the suspension spring mechanism of FIG. 9 as viewed from a side.

11 is a sectional view of a drum type washing machine to which the suspension spring mechanism of FIG. 8 is applied.

FIG. 12 is a sectional view of a general drum type washing machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inner tank, 2 ... Outer tank, 3 ... Frame, 4 ... Suspension spring, 5
... friction dampers, 12a, 12b ... rods, 14 ... rotating shafts, 15 ... additional inertia bodies, 16a, 16b ... beams, 17a, 1
7b: connection point, 18: connecting rod, 19a, 19b: hook, 20: link mechanism, 30: variable damper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 BA04 DD01 3J048 AA02 AD07 AD11 AD12 BC02 BF04 BF10 BF12 DA07 EA07

Claims (5)

[Claims] 1. A frame, an outer tub for holding water during washing, a suspension spring mechanism for suspending and supporting the outer tub from above the frame, and a damper for holding the outer tub from below the frame. Wherein the suspension spring mechanism has a suspension spring that suspends the outer tub, and a pantograph-shaped link mechanism that is arranged around the suspension spring and performs a pantograph operation in accordance with expansion and contraction of the suspension spring. The link mechanism includes a link member formed by connecting two rods so as to be rotatable with each other and arranged substantially symmetrically with respect to a direction in which the suspension spring extends and contracts, and an additional inertia member provided on the rod. A washing machine, wherein both ends of each of the link members are rotatably connected to the outer tub and the frame. 2. The washing machine according to claim 1, wherein a beam is provided at a root portion of both hooks of the suspension spring, and both ends of each link member are rotatably supported by the beam. 3. The connecting rod according to claim 1, wherein a connecting rod rotatably connected to the outer tub and the suspension spring mechanism is provided between the outer tub and the suspension spring mechanism. Washing machine. 4. A washing machine having a frame, an outer tub for holding water during washing, and a suspension spring mechanism for suspending and supporting the outer tub from above the frame, wherein the suspension spring mechanism comprises A suspension spring for suspending the tank, and a pantograph-shaped link mechanism disposed around the suspension spring and performing a pantograph operation in accordance with expansion and contraction of the suspension spring, wherein the link mechanism can rotate the two rods with each other. A link member formed to be connected to the suspension spring and arranged substantially symmetrically with respect to the direction of expansion and contraction of the suspension spring, and a beam provided at the root of both hooks of the suspension spring and rotatably supporting both ends of each link member. A washing machine comprising: an additional inertial body provided on the rod; and a variable damper rotatably provided on the beam to suppress movement of the rod. 5. The variable damper according to claim 4, wherein the variable damper includes a pin provided on the rod, and a U-shaped rotating body formed to sandwich the pin with a gap with respect to the pin. A rotating shaft provided on the beam to rotatably support the rotating body, and when the rod largely swings with expansion and contraction of the suspension spring, the pin is applied to the inside of the U-shape. A washing machine configured to suppress large swing of the rod.