JP3118041B2 - Anti-vibration structure of washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping structure for supporting a washing drum of a washing machine in a vibration damping manner.

[0002]

2. Description of the Related Art In a washing machine having a horizontal washing drum, the vibration of the washing drum is not transmitted to the outside.
The washing drum is supported by a spring suspended from the washing machine frame.However, when the rotation speed passes through the resonance point after startup, such as at the time of dehydration operation, to prevent large vibrations, It has a damper.

However, a damper that suppresses vibration (amplitude and displacement) at a resonance point in a relatively low rotation region increases the vibration transmission rate due to friction in a high rotation region that is a steady region of dehydration operation. As a result, vibration during dehydration is relatively increased.

Accordingly, the applicant of the present invention has filed Japanese Patent Application No. 3-355.
No. 73 proposes a free lock damper that suppresses the vibration of the washing drum only near the resonance point and does not restrict the movement of the washing drum in other rotation ranges.

[0005] This is to use an electromagnetic solenoid to energize the electromagnetic solenoid near the resonance point to brake the vibration of the washing drum and suppress the movement. The function as a damper is not exhibited, but the state is free from the washing drum so as to increase the vibration insulation.

[0006]

However, in this case, the structure of the free-lock damper is complicated, the weight is increased by an electromagnetic solenoid or the like, and a means for detecting the number of rotations of the washing machine is provided. There have also been problems such as the necessity of a new control device such as a controller for controlling energization of the solenoid and a relay operated by a signal from the controller.

The present invention, which focuses on the above problems, provides a vibration-proof structure of 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 damping structure for a washing machine in which a washing drum is connected to and supported by a washing machine frame via a support spring. A plurality of pairs of crank links that are movably connected to each other, the rotating ends of the paired crank links are offset in the direction of the rotating axis, and the rotating ends of the crank links are rotated to each other via a connecting pin. A double crank link mechanism is configured to be movably connected, and a plurality of double crank link mechanisms are disposed around the washing drum.

[0009]

When the washing drum supported by the support springs swings greatly near the resonance point, one of the double crank link mechanisms is extended most, and the displacement of the washing drum is regulated.

When the double crank link mechanism is fully extended, each leaf spring coupled thereto is elastically deformed by a tensile load to absorb impact energy, and the elastic deformation of the leaf spring causes undulations on sliding portions of each crank link. Occurs
The frictional resistance functions as a friction damper for absorbing vibration energy.

On the other hand, in a high rotation frequency region beyond the resonance point, the drum displacement becomes small, and no tension load is applied to each leaf spring, and the friction of the double crank link mechanism is suppressed to a small value. Only the same value as when the washing drum is supported can be suppressed to only a small value, and good vibration insulation 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 rotated by a motor 4 is arranged 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 mounted outside the lower surface of the washing drum 3, and rotation is transmitted to a pulley 7 attached to a rotating shaft of the washing tub 2 by a pulley 5 and a belt 6 attached to a rotating shaft.

The washing drum 3 is suspended from the upper part of the frame 1 by a pair of support springs 8 from obliquely above, and the displacement at the time of resonance is regulated by a double crank link mechanism 9 also arranged on the left and right sides. You.

As shown in FIGS. 3 and 4, the double crank link mechanism 9 has a pair of crank links 16 rotatably connected via connecting pins 20.
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 board portion 11A joined to the bracket 22 of the frame 1 or the washing drum 3, and a protruding plate portion 11B joined to the rotating end of each crank link 16. .

The leaf springs 11 provided so as to sandwich the common double crank link mechanism 9 are symmetrically arranged such that the respective board portions 11A and the protruding plate portions 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 passing through the holes 13 respectively.

A hole 15 is formed in the protruding plate portion 11B of each leaf spring 11, and a cylindrical collar 14 is fixed to the hole 15 by caulking. Each collar 14 has 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 an arm portion 16B orthogonal to the shaft portion 16A, and a hole 18 parallel to the shaft portion 16A is provided at the tip end of rotation 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
The coupling pin 20 is fitted via the. Each crank link 1
The bush 19 is press-fitted into each hole 18 of the
The two 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 tub, vibration is generated accompanying the rotation of the washing tub 2 particularly during the spin-drying operation, and this vibration is transmitted to the washing machine frame 1.

The washing drum 3 moves up and down near the resonance point,
If the washing drum 3 is to be largely displaced left and right, one of the double crank link mechanisms 9 located on the left and right of the washing drum 3 is fully extended, and the turning radius is maximized, and further displacement is restricted.

FIG. 5 shows the trajectory of the drum 3. The displacement in both the left and right directions and the vertical direction can be suppressed to a small value, and the drum 3 rotates without contacting the washing machine frame 1 and the like. On the other hand, when the drum 3 and the frame 1 are interposed with a single single crank, the vertical displacement becomes much larger than the horizontal displacement 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 cannot rotate. 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 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
If one of the double crank link mechanisms 9 located on the left and right sides of the washing drum 3 is to be displaced to the greatest extent vertically or horizontally, one of the double crank link mechanisms 9 is fully extended. Each leaf spring 11 is elastically deformed by a tensile load F acting on each leaf spring 11 via each bolt 12 when the double crank link mechanism 9 is fully extended, thereby absorbing impact energy. Further, as the leaf spring 11 bends and deforms as shown by the arrow in FIG. 3, the coupling pin 20 is inclined with respect to the joining surface of the board portion 11A of the leaf spring 11, and between the coupling pin 20 and each bush 19, and Stiffness is generated in the shaft portion 16A of the crank link 16 and the bush 17, and a function of a friction damper that absorbs vibration energy by frictional resistance generated in each sliding portion is performed.

On the other hand, in the high rotation frequency region beyond the resonance point, the displacement of the drum becomes small, the tensile load is not applied to each leaf spring 11, and the friction of the double crank link mechanism 9 is suppressed to a small value. The value is reduced to the same small value as when the drum 3 is supported only by the support spring 8, and the vibration insulation can be kept good.

As described above, the leaf spring 11 and the double crank link mechanism 9 have a simple structure,
A preferable vibration damping action is exerted on the washing machine over the entire rotation frequency range.

When the double crank link mechanism 9 is fully extended and a 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 directions approaching each other. Therefore, each crank link 1
6 are pressed against each other, and the connecting pin 20 is connected to each bush 1.
9 is prevented from coming off.

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

In this embodiment, the horizontal drum type has been described, but the present invention can also be applied to a vertical drum type.

[0033]

As described above, the present invention provides a vibration isolating structure for a washing machine, comprising a plurality of pairs of crank links rotatably supported by a washing drum and a washing machine frame via leaf springs. The double crank link mechanism comprises a connecting pin that offsets the rotating end of each crank link in the direction of the rotating axis and connects the rotating ends of each crank link to be rotatable with each other. In spite of the configuration, it is possible to provide a washing machine excellent in quietness, while suppressing large vibration of the washing drum near the resonance point and maintaining good insulation of vibration in a region other than the resonance point.

[Brief description of the 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.

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

FIG. 5 is a diagram showing trajectories of a double crank link mechanism and a washing drum.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine frame 3 Washing drum 8 Support spring 9 Double crank link mechanism 11 Leaf spring 16 Crank link 20 Connecting pin

Claims (1)

(57) [Claims] In a vibration isolating structure of a washing machine in which a washing drum is connected to and supported by a washing machine frame via a support spring, a plurality of pairs are rotatably connected to the washing drum and the washing machine frame via a leaf spring. The crank ends of each pair of the crank links are offset in the direction of the rotation axis, and the rotation ends of the respective crank links are rotatably connected 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.