JPH09122382A - Electric washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To homogenize the pressing force of a brake device mounted in a clutch mechanism part to control rotation of a washing and dewatering machine and to stabilize the braking performance by setting an almost circular flat plate between an almost circular brake disc and a brake pad mounted to press the brake disc. SOLUTION: A brake device mounted in a clutch mechanism part comprises a brake disc 114, a flat plate 151, a brake pad 118, a solenoid 123, etc. The flat plate 151 has three setting holes, is fixed to a lower case 121 integrated with the brake pad 118 by three brake pushing springs 119 and bolts 120 for springs, and presses both sides of a lining 115 of the brake disk 114 together with the lower case 121. When the brake is actuated, since the flat plate 151 is newly added to reinforce the brake pad 118, deformation of the brake pad 118 is suppressed and a sliding face with the brake disk is homogenized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric washing machine having a clutch mechanism portion of the electric washing machine provided with a brake device for stabilizing brake operation.

[0002]

2. Description of the Related Art A conventional washing machine drive unit includes a clutch unit for switching between washing and dehydrating operations by loosening and tightening a coil spring, a speed reducing unit for lowering the rotation speed of a stirring blade during washing, and a washing and dehydrating unit. It consists of a brake device that controls the rotation of the washing and dehydrating tub when stopped. The brake device is
A circular brake plate having ring-shaped linings on both sides, one on the outer surface of the bearing housing that holds the bearing, and the other on a substantially circular brake contact plate having a substantially U-shaped cross section. It is held in a state of being constantly pressed.

When a braking operation is required, power is transmitted to the brake plate by external switching, and the braking operation is performed by the sliding resistance of the lining. The brake contact plate is made of steel plate with a thickness of t2.0 to t2.3mm and is 3
It has a spring mounting part at each place, and the push spring has a dehydration capacity of 6 to 7 kg and a dehydration rotation speed of 1000 to 1100 r / m.
In the fully automatic washing machine of in, the dehydration stop time is 8 to 1 at the rated load.
The dynamic torque is 90 to 110 in order to achieve 0 seconds.
Since kgcm is required, the pressing force of one push spring is about 40 kg.

[0004]

SUMMARY OF THE INVENTION However,
In the conventional brake device, only the part pressed against the three push springs hits strongly, it is difficult to make the pressing force uniform, the braking force becomes unstable, and when the rated capacity is further increased or the rotation speed is increased. When trying to do so, there is a problem that stable braking performance cannot be obtained simply by increasing the pressing force of the pressing spring.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric washing machine having a clutch device of the electric washing machine provided with a brake device capable of uniformly pressing the brake plate and stabilizing the braking performance. .

[0006]

In order to achieve the above object, the present invention is a brake device provided in a clutch mechanism portion for controlling the rotation of a washing / dehydrating tub to switch between washing and spinning. One surface of a substantially disc-shaped brake plate having a substantially ring-shaped lining on both surfaces for braking the rotation of the dehydration tank is provided on the surface of the lower case of the clutch mechanism section,
The other surface is constantly pressed against the surface of a substantially disk-shaped brake contact plate that can be fixed to the lower case with a plurality of springs, and the rotation of the washing / dehydrating tank is applied to the brake plate by the clutch device of the clutch mechanism section. In an electric washing machine having a braking device that transmits the rotational movement of the brake plate to perform the braking operation of the rotation, between a surface of the brake contact plate and a lining surface of the brake plate on the brake contact plate side. In addition, a substantially disk-shaped flat plate that is removable and that can be fixed to the lower case by being superposed on the brake contact plate is provided.

According to the present invention, a substantially disk-shaped flat plate that is removable and can be fixed to the lower case by being superposed on the brake contact plate is provided on the surface of the brake contact plate and on the brake contact plate side of the brake plate. Provided between the lining surface and. Compared to the brake contact plate, the substantially disk-shaped flat plate does not need to have a rising portion for fixing the solenoid that switches between washing and dehydration, and thus the surface accuracy is easy and the sliding surface with the brake plate is uniform. Further, by making the flat plate a steel plate, the rigidity of the sliding surface with respect to the brake plate can be increased and the deformation of the brake contact plate can be suppressed. Further, even in a washing machine having different washing capacities, a flat plate is provided for a small capacity and a flat plate is provided for a large capacity, so that a washing machine with different washing capacities can be used while sharing the brake pad.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An electric washing machine according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a vertical cross section of an electric washing machine according to an embodiment of the present invention. There is a box-shaped outer frame 1 made of steel plate,
An outer tub 4 made of synthetic resin is vibration-supported therein by a suspension rod 2 and a vibration-proof spring 3. A rib 4a for attaching the suspension rod 2 and the vibration-proof spring 3 is formed on a side wall of the outer tub 4, and a washing and dehydrating tub 5 having a substantially circular cross-section is provided in the outer tub 4. .

A large number of dehydration holes 5a are provided on the side wall of the washing / dehydrating tub 5. At the center of the inner bottom of the washing / dehydrating tub 5, there is formed a recess 5c for mounting a large-sized rotary blade 7 described later. At the upper end of the outer tub 4, a synthetic resin tub cover 8 is fixed between the outer tub 4 and the washing / dehydrating tub 5 in order to prevent the laundry from falling.

At the outer bottom of the outer tub 4, a drainage device 9 and a drive unit 1 for rotating the rotor 7 and the washing / dehydrating tub 5.
0 and 0 are attached via a support plate 11 made of a steel plate. As shown in FIG. 2, the support fitting 11 has a substantially box shape, and is fixed to the outer bottom portion of the outer tub 4 by a screw or the like.

The drainage device 9 includes a drainage valve 12 connected to the inner bottom portion of the outer tub 4, and a drainage hose 1 connected to the drainage valve 12.
3 is provided. The drain valve 12 is opened and closed by a lever 12b operated by a small cycle motor 12a. As shown in FIG. 2, the drain valve 12 is attached to the support fitting 11 with a screw 12c. Drainage hose 13
Extend outside the outer frame 1 through the lower side wall of the outer frame 1 or through the hole 14 provided in the PP base 301.

As shown in FIG. 1, the drive section 10 includes a washing machine motor 15, a clutch mechanism section 16, and a transmission mechanism section 1 for transmitting the rotation of the washing machine motor 15 to the clutch mechanism 16.
7 is provided. As shown in FIG. 4, a brake device 18 for stopping the rotation of the washing / dehydrating tub 5 and a speed reducing mechanism for decelerating the rotation of the washing machine motor 15 and transmitting the rotation to the rotor 7 are provided inside the clutch mechanism portion 16. It is provided. As shown in FIG. 2, the washing machine motor 15 is fixed to the support fitting 11 by screws 15a.

As shown in FIG. 2, the transmission mechanism portion 17 has a first pulley 17a fixed to the rotary shaft of the washing machine motor 15.
And a second pulley 17 arranged below the clutch mechanism 16.
b, and a belt 17c wound around the first pulley 17a and the second pulley 17b.

Clutch mechanism 16 including a braking device 18
Will be described in detail with reference to FIGS.

FIG. 3 shows a longitudinal section of the clutch mechanism portion 16, and FIG. 4 shows a perspective development of the clutch mechanism portion 16. The upper case 101 of the clutch mechanism 16 is the upper bearing 1
02 is press-fitted to the outer peripheral portion, and the inner peripheral portion of the upper bearing 102 and the hollow shaft 103 are also press-fitted to support the hollow shaft 103. The spring hook pin 104 is fixed to the upper case 101 by means such as caulking.

The coil spring 105 prevents the washing / dehydrating tub 5 from rotating during washing, and when the washing / dehydrating tub 5 is viewed from the clothing inlet 20a side, it is tightened to the left when it is rotated. , Is wound around the hollow shaft 103 so as to be on the loose side with respect to right rotation. One of the ends of the coil spring 105 is fixed to the spring hook pin 104,
When the coil spring 105 is on the tight side, the rotation of the washing / dehydrating tub 5 is locked.

The hollow shaft 103 is press-fitted with a gear drum 147 having a speed reducing mechanism inside, and the gear drum 147 is fixed to the lower shaft 125 with a screw. At the time of dehydration, the lower shaft 125, the gear drum 147, and the hollow shaft 10 are provided.
3 rotates integrally and gives a rotating force to the washing and dehydrating tub 5.

The lower case 121 is press-fitted to the outer peripheral portion of the lower bearing 106, and the inner peripheral portion of the lower bearing 106 and the shaft 125 are axially supported with a gap, and the step portion 110 of the lower shaft 125 is supported. Since the inner peripheral portion of the lower bearing 106 is locked, the lower bearing 106 receives a load in the thrust direction.

The clearance fit between the lower shaft 125 and the lower bearing 106 is such that when the upper case 101 and the lower case 121 are assembled, the step portion 110 of the lower shaft 125 is attached to the lower bearing 1.
The upper bearing 102 and the hollow shaft 103 are press-fitted with each other while being received by the lower shaft 125 and the gear drum 14.
7. The clearance between the upper and lower bearings 102 and 106 and the built-in dimension in which the hollow shaft 103 is integrated is adjusted by the gear drum 147.
The adjustment is made by the gap between the tip of the upper bearing 102 and the upper bearing 102.

The brake device 18 includes a brake plate 114,
Lining 115, flat plate 151, brake contact plate 11
8, a brake pushing spring 119, a spring bolt 120, and a lower arm portion 1 that is integrally extended with the brake contact plate 118.
22 and solenoid 123.

The brake plate 114 integrally has a lining 115 on both sides of the outer circumference by adhesion or synthetic resin. The brake plate 114 is in play with the boss (1) 116 at a play portion 117. Further, of both surfaces of the lining 115 of the brake plate 114, one is in contact with the flat plate 151 made of a steel plate and having a substantially disc shape, and the other is in contact with the lower case 121.

The flat plate 151 made of steel and having a substantially disc shape is
It has three mounting holes and is fixed to the lower case 121 integrally with the brake contact plate 118 by three brake push springs 119 and spring bolts 120, and both sides of the lining 115 of the brake plate 114 are fixed. It is pressed against the lower case 121. The lower arm portion 122, which extends integrally from the brake contact plate 118, has a solenoid 12
3 is locked.

The inner boss 124 has a lower shaft 125.
Is engaged with the spline portion 126. Inner boss 1
24 has an inverted U-shaped spring engaging portion 127, and the engaging portion 1
A bent portion 131 of the clutch spring (1) 128 is engaged with 27. Inner boss 116, inner boss 12
A clutch spring (1) 128 is engaged with the outer periphery of the No. 4. This clutch spring (1) 128 is attached to the inner boss 1
16. The inner boss 124 is engaged with the inner boss 124 without any interference. The spring collar 130 is provided on the outer circumference of the clutch (1) 128, and the operation band 1 is provided on the outer circumference.
37 is wrapped around. The surface of the operation band 137 is attached with synthetic fibers or the like by electrostatic flocking or the like.
And stabilizes the sliding torque of the spring collar 130.
There is a spring engagement groove 133 at the bottom of the spring collar 130,
It engages with the engaging portion 135 of the clutch spring (2) 129, and has a plurality of spring engaging grooves 134 on the upper portion of the spring collar 130.

This is because when the spring collar 130 is installed,
Spring engagement grooves 134 are provided at 15 ° intervals so that it is not necessary to position the rising portions of the engaging portion 135 of the clutch spring (2) 129 and the engaging portion 136 of the clutch spring (1) 128.
The workability is improved by engaging with the groove that abuts on the engaging portion 136 of the clutch spring.

The clutch spring (2) 129 is engaged with the inner boss 124 and the pulley boss 138 with a slight tightening margin, and the upper end thereof is axially raised to engage with the elongated hole 139 of the inner boss 124. And clutch spring (2) 1
Prevent 29 slips.

Next, the operation of the clutch mechanism 16 will be described.

During washing, first, when the second pulley 176 rotates in the Q direction, the clutch spring (1) 128 is in the loosening direction, so that power is not transmitted, and the rotation of the second pulley 176 rotates with the gear shaft 141. , The reduction gear 142 and the splash shaft 143 are transmitted to the rotor 7.

At this time, the washing / dehydrating tub 5 also tries to rotate due to inertia, but the washing / dehydrating tub 5 has a flange 14 at the bottom thereof.
Since it is fixed to the hollow shaft 103 by means of a set screw 145 through 4, the coil spring 105 is tightened in the tightening direction to prevent rotation.

When the second pulley 176 rotates in the R direction, the clutch spring (1) 128 is in the tightening direction, but the plunger 123a of the solenoid 123 and the rising portion 137a of the operating band 137 engage with each other, and the spring collar Thirteen
Lock 0. At this time, the engaging portion 135 of the clutch spring (2) 129 has the spring engaging groove 133 of the spring collar 130.
Is locked to the end portion 130a of the stirring blade, and the spring is loosened.
Is transmitted to

At this time, the coil spring 105 does not operate because it is in the loosening direction, but the lower shaft 125 that is integrally connected to the hollow shaft 103 and the inner boss 124 through the spline portion 126 are also washed and removed. Aquarium 5
The rotational force of is transmitted.

Further, at this time, the clutch spring (1) 128
Bending portion 131 and spring engaging portion 1 of inner boss 124
Since 27 is engaged, the clutch spring (1) 128 is wound around the outer circumferences of the inner boss 124 and the inner boss 116, is transmitted to the brake plate 114 via the loosened portion 117 of the inner boss 116, and the lining 115 slides. Rotation is prevented by resistance.

The sliding resistance of the lining 115, that is, the braking torque is used to prevent the washing / dehydrating tub 5 from rotating rightward (when viewed from above) during washing, and to apply the braking for dewatering to be described next to the washing / dehydrating tub. Has the role of stopping the rotation of 5.

At the time of dehydration, first, the solenoid 123 is energized to suck the plunger 123a, and the operating band 13
7 is released and the spring collar 130 is freed. At this time, by rotating the second pulley 17b in the R direction, the clutch spring (1) 128 becomes the closing direction, and the rotation is transmitted to the lower shaft 125, the gear drum 147, and the hollow shaft 103 via the pulley boss 138 and the inner boss 124. Rotate the washing / dehydrating tank 5 at high speed.

At this time, the clutch spring (2) 129 rotates integrally with the inner boss 124 and the spring collar 130, but since the clutch spring (2) 129 is engaged without any interference, it does not wind around the inner boss 116 and brakes. Does not work. Also,
The coil spring 105 is in the loosening direction and the hollow shaft 103.
Does not prevent the rotation of.

When braking, first the solenoid 12
By stopping the energization of No. 3, the plunger 123a
Projects and locks the rising portion 137a of the operating band 137 that is rotating at high speed. At this time, slip occurs between the operation band 137 and the spring collar 130, and the spring collar 1
The rotation of 30 does not stop immediately. However, operation band 1
The sliding resistance between 37 and the spring collar 130 causes the clutch spring (2) 129 to wind and the brake to operate.

The brake performance is the brake push spring 119.
It can be adjusted by the pressing force and the presence or absence of the flat plate 151. Normally, even without the flat plate 151, the brake pad 118
Is made of a steel plate having a plate thickness of t2.0 to t2.3 mm, and the brake torque can be adjusted to some extent by increasing the spring force of the three brake pressing springs 119.

However, the dehydration capacity is 7 kg or more, or the dehydration rotation speed is 1000 r / min to 1100 r / min.
In the above case, the brake torque, that is, the dynamic torque is required to be 100 to 150 kgcm. In this case, in order to increase the dynamic torque to 100 to 150 kgcm, even if only the spring force is simply increased, only the portions pressed against the three brake pressing springs 119 hit strongly, so the brake contact plate 118 is deformed, The pressing force is not uniform and causes abnormal wear and noise. As a countermeasure in this case, a substantially disk-shaped flat plate 151 is added to reinforce the brake contact plate 118.

Compared to the brake contact plate 118, the substantially disk-shaped flat plate 151 does not need to extend the lower arm portion 122 for fixing the solenoid 123, so that it is less deformed, and therefore the surface accuracy is easier, and the brake plate 114 is easier. The sliding surface with and becomes uniform.

Further, the plate thickness of the flat plate 151 is t2.0 to t2.
By making the steel plate of 3 mm, the rigidity of the sliding surface with the brake plate 114 can be increased and the deformation of the brake contact plate 118 can be suppressed.

Instead of adding the flat plate 151, a method of increasing the plate thickness of the brake contact plate 118 itself to t4.0 to t5.0 mm can be considered, but the lower arm portion 122 described above is used.
May be difficult to integrally provide, and the provision of the lower arm portion 122 may cause problems such as deterioration in surface accuracy of the sliding surface with the brake plate 114.

Further, the flat plate 151 is used as the brake contact plate 11
When 8 is reinforced, any electric washing machine having a different washing capacity can be used. That is, the flat plate 151 is not provided for a small capacity, and the flat plate 1 is provided for a large capacity.
By adding 51, it is possible to correspond to any electric washing machine having a different washing capacity while the brake pad 118 remains in service.

[0043]

According to the present invention, by providing a substantially disk-shaped flat plate between the substantially disk-shaped brake plate and the brake abutment plate provided to press the brake plate, the pressing force becomes uniform. , The braking performance is stable, and thus the reliability of the electric washing machine can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an electric washing machine according to an embodiment of the present invention.

FIG. 2 is a plan view from the bottom of the electric washing machine of FIG.

3 is a vertical cross-sectional view of the clutch mechanism portion of FIG.

FIG. 4 is a perspective development view of the clutch mechanism portion of FIG. 1.

[Explanation of symbols]

18 ... Brake device, 114 ... Brake plate, 115 ... Lining, 118 ... Brake contact plate, 119 ... Brake pressing spring, 119 ... Brake pressing spring, 120 ... Spring bolt, 151 ... Flat plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazutoshi Katane 1-1-1 Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Electric Appliance Division

Claims (4)

[Claims] 1. A brake device provided in a clutch mechanism section for controlling the rotation of a washing / dehydrating tub to switch between washing and dewatering, wherein a substantially ring-shaped lining for braking the rotation of the washing / dehydrating tub is provided on both sides. One side of the substantially disc-shaped brake plate has a surface of the lower case of the clutch mechanism portion, and the other side of the substantially disc-shaped brake contact plate that can be fixed to the lower case by a plurality of springs. An electric washing machine having a brake device which is constantly in pressure contact with the clutch device of the clutch mechanism section to transmit the rotation of the washing / dehydrating tub to the brake plate, and which brakes the rotation by sliding the brake plate. , Between the surface of the brake pad and the lining surface of the brake plate on the side of the brake pad, removable,
An electric washing machine comprising a substantially disk-shaped flat plate that can be fixed to the lower case by overlapping with the brake contact plate. 2. The electric washing machine according to claim 1, wherein the flat plate is attached and detached according to a washing capacity of the washing machine. 3. The electric washing machine according to claim 1 or 2, wherein the flat plate is attached when the washing capacity is large and is removed when the washing capacity is small. 4. The electric washing machine according to claim 1, wherein the lining is integrally provided on the brake plate with a synthetic resin.