JPH05137885A - Vibration proof structure of washing machine - Google Patents

Abstract

PURPOSE:To provide the vibration-proof structure of a washing machine which surely suppresses the vibration at a resonance point, even with the simple constitution. CONSTITUTION:A washing drum 3 is connection-supported on a washing machine frame 1 by a supporting spring 8, and plural pairs of crank links 16 which are supported in turnable manner through a leaf spring 11 on the washing drum 3 and the washing machine frame 1 are provided, and the turning edge parts of the crank links 16 in pair are offset in the turning shaft direction, and a joint pin 20 which connects the turning edge parts of the crank links 16 in turnable manner is provided, and a double crank link mechanism 9 is constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration structure for isolating and supporting a washing drum of a washing machine.

[0002]

2. Description of the Related Art In a washing machine having a horizontal washing drum, the vibration of the washing drum is prevented from being transmitted to the outside.
The washing drum is supported by the spring in a state of being suspended by a spring with respect to the washing machine frame, but in order to prevent a large vibration when the number of revolutions passes through the resonance point after startup such as during dehydration operation, It also has a damper.

However, the damper which suppresses the vibration (amplitude, displacement) at the resonance point in the relatively low rotation range increases the vibration transmissibility by the friction in the high rotation range which is the steady state of the dehydration operation. However, the vibration during dehydration is relatively increased.

Therefore, Japanese Patent Application No. 3-355 filed by the present applicant.
No. 73, etc. proposed a free lock damper that suppresses the vibration of the washing drum only near the resonance point and does not restrain the movement of the washing drum in other rotation regions.

This utilizes an electromagnetic solenoid to energize the electromagnetic solenoid near the resonance point to brake the vibration of the washing drum and suppress the motion. In the spin-drying rotation range, the energization is cut off to suppress vibration. The function as a damper is not exerted, but the washing drum is set in a free state to enhance vibration insulation.

[0006]

However, in this case, the structure of the free lock damper is complicated, the weight is heavy due to the electromagnetic solenoid, etc., and the means for detecting the number of rotations of the washing machine and the electromagnetic means based on the number of rotations are used. There has also been a problem in that a controller for controlling energization of a solenoid and a control device such as a relay operated by a signal from the controller are newly required.

Focusing on the above problems, the present invention provides a vibration isolating structure for a washing machine which does not require a control device or the like and has a simple structure and can reliably suppress vibration at a resonance point. The purpose is to

[0008]

SUMMARY OF THE INVENTION The present invention provides a vibration isolating structure for a washing machine in which a washing drum is connected and supported by a washing machine frame via a support spring, and the washing drum and the washing machine frame are rotated by a leaf spring. A plurality of pairs of crank links that are movably connected to each other are provided, the rotating ends of each pair of crank links are offset in the rotating shaft direction, and the rotating ends of each crank link are rotated with respect to each other via a coupling pin. A double crank link mechanism is movably connected to form a plurality of double crank link mechanisms around the washing drum.

[0009]

When the washing drum supported by the support springs tries to oscillate greatly near the resonance point, one of the double crank link mechanisms is maximally extended, and the displacement of the washing drum is restricted.

When the double crank link mechanism is fully extended, the leaf springs coupled thereto are elastically deformed by a tensile load to absorb impact energy, and the elastic deformation of the leaf springs causes a twist in the sliding portion of each crank link. Occurs,
The frictional resistance serves as a friction damper that absorbs vibration energy.

On the other hand, in the high rotation frequency range beyond the resonance point, the drum displacement becomes small, the tensile load is not applied to each leaf spring, and the friction of the double crank link mechanism is also kept small. It can be suppressed to a small value similar to the case where the washing drum is supported only by itself, and good insulation of vibration can be maintained.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, reference numeral 1 denotes a washing machine frame, in which a washing drum 3 is supported in a horizontal state. A washing tub 2 which is rotationally driven by a motor 4 is disposed inside the washing drum 3, and the washing tub 2 rotates at different rotation speeds during normal washing and during dehydration. In addition,
The motor 4 is attached to the outside of the lower surface of the washing drum 3, and the rotation is transmitted to the pulley 7 attached to the rotating shaft of the washing tub 2 by the pulley 5 attached to the rotating shaft and the belt 6.

The washing drum 3 is lifted from the diagonally upper side by the pair of support springs 8 on the left and right sides of the frame 1, and the displacement at resonance is regulated by the double crank link mechanism 9 arranged on the left and right sides. It

As shown in FIGS. 3 and 4, in the double crank link mechanism 9, a pair of crank links 16 are rotatably coupled via coupling pins 20, and each crank link 16 is connected.
The rotating end portions of are connected to the frame 1 and the washing drum 3 via a pair of leaf springs 11, respectively.

Each leaf spring 11 is bent in an L shape and has a base plate portion 11A joined to the bracket 22 of the frame 1 or the washing drum 3 and a projecting plate portion 11B joined to the rotating end portion of each crank link 16. ..

The leaf springs 11 provided so as to sandwich the common double crank link mechanism 9 are symmetrically arranged so that the base plate portion 11A and the protruding plate portion 11B face each other.

Each leaf spring 11 has a hole 13 in its substrate portion 11A.
Are formed and fastened to the frame 1 and the washing drum 3 via the bolts 12 penetrating the holes 13.

A hole 15 is formed in the projecting plate portion 11B of each leaf spring 11, and a tubular collar 14 is caulked and fixed in the hole 15. Inside each collar 14 is a cylindrical bush 1 with a collar
7 is press-fitted.

Each crank link 16 is rotatably fitted to each collar 14 via each bush 17 and has a shaft portion 16A.
And an arm portion 16B orthogonal to the shaft portion 16A, and a hole 18 parallel to the shaft portion 16A is provided on the rotation tip side of each arm portion 16B.
Is formed.

The arm portion 16B of each crank link 16 is offset in the direction of the rotation axis, and the bush 19 is inserted into each hole 18.
The coupling pin 20 is fitted via the. Each crank link 1
Bush 19 is press-fitted into each hole 18 of 6
Both ends of the coupling pin 20 are rotatably fitted to each other.

Next, the operation will be described.

In the drum type washing machine, the washing drum 3
Due to the unbalanced mass due to the unevenness of the laundry inside, the vibration is generated with the rotation of the washing tub 2 especially during the spin-drying rotation, and this vibration is transmitted to the washing machine frame 1.

The washing drum 3 moves up and down near the resonance point,
When the washing drum 3 is largely displaced to the left or right, one of the double crank link mechanisms 9 located on the left and right of the washing drum 3 is maximally extended to maximize its rotation radius, and further displacement is restricted.

FIG. 5 shows the locus of the drum 3. The displacements in the horizontal and vertical directions are both small, and the drum 3 rotates without coming into contact with the washing machine frame 1 or the like. On the other hand, when the drum 3 and the frame 1 are provided with a single single crank, the displacement in the up-down direction becomes much larger than the displacement in the left-right direction of the drum 3.

When the washing drum 3 is supported only by the support spring 8 as shown in FIG. 6, the vibration transmissibility becomes infinite at the resonance rotation frequency, and the washing drum 3 becomes unrotatable. When the resonance of the washing drum 3 is suppressed by the 11 and the double crank link mechanism 9, the vibration transmissibility can be suppressed to be small near the resonance point, and the motor 4 and the washing tub 2 can continue to rotate smoothly.

That is, the washing drum 3 near the resonance point
When a large amount is to be displaced up and down and left and right, one of the double crank link mechanisms 9 located on the left and right of the washing drum 3 is maximally extended. Each leaf spring 11 is elastically deformed by the tensile load F acting on each leaf spring 11 via each bolt 12 when the double crank link mechanism 9 is fully extended, and absorbs impact energy. Further, when the leaf spring 11 is flexibly deformed as shown by the arrow in FIG. 3, the coupling pin 20 is inclined with respect to the joint surface of the base plate portion 11A of the leaf spring 11, and between the coupling pin 20 and each bush 19, and each. A twist occurs in the shaft portion 16A of the crank link 16 and the bush 17, and the frictional resistance generated in each sliding portion serves as a friction damper that absorbs vibration energy.

On the other hand, in a high rotation frequency range beyond the resonance point, the drum displacement becomes small, a tensile load is not applied to each leaf spring 11, and the friction of the double crank link mechanism 9 is also suppressed to a small value, so that the vibration transmissibility is reduced. The value can be suppressed to a small value similar to the case where the drum 3 is supported only by the support spring 8, and good insulation of vibration can be maintained.

In this way, the leaf spring 11 and the double crank link mechanism 9 have a simple structure, but the drum 3
It exerts a preferable vibration damping effect on the washing machine over the entire rotation frequency.

When the double crank link mechanism 9 is fully extended and the tensile force F acts on each leaf spring 11, the projecting plate portions 11B sandwiching each double crank link mechanism 9 tend to bend in the direction in which they approach each other. For each crank link 1
6 are pressed against each other, and the connecting pin 20 is attached to each bush 1
9 is prevented from coming off.

In this embodiment, a pair of double crank link mechanisms 9 are arranged around the washing drum 3, but
One or more double crank link mechanisms 9 may be arranged around the washing drum 3.

In this embodiment, the horizontal drum type is explained, but the present invention can be applied to the vertical drum type.

[0033]

As described above, according to the present invention, in a vibration isolating structure for a washing machine, a plurality of pairs of crank links rotatably supported by a washing drum and a washing machine frame via leaf springs are provided. The double crank link mechanism is configured with a connecting pin that offsets the rotating ends of the respective crank links in the direction of the rotating shaft and includes the connecting pins that rotatably connect the rotating ends of the respective crank links. It is possible to provide a washing machine having excellent quietness while suppressing large vibration of the washing drum near the resonance point while maintaining good insulation properties of the vibration in the area other than the resonance point.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a washing machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view of a leaf spring and a double crank link mechanism of the same.

FIG. 4 is a side view of the leaf spring and the double crank link mechanism.

FIG. 5 is a diagram similarly showing the loci of the double crank link mechanism and the washing drum.

FIG. 6 is a diagram showing a vibration characteristic of the washing machine.

[Explanation of symbols]

 1 Washer Frame 3 Washing Drum 8 Support Spring 9 Double Crank Link Mechanism 11 Leaf Spring 16 Crank Link 20 Coupling Pin

Claims (1)

[Claims] 1. A vibration isolation structure for a washing machine, wherein a washing drum is connected to and supported by a washing machine frame via a support spring, and a plurality of pairs are rotatably connected to the washing drum and the washing machine frame via leaf springs. Double crank by connecting the turning ends of the pair of crank links to each other in the turning axis direction and rotatably connecting the turning ends of the crank links to each other via coupling pins. An anti-vibration structure for a washing machine, comprising a link mechanism and a plurality of double crank link mechanisms arranged around a washing drum.