JPH0341669Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a dehydrating washing machine.

(b) Conventional technology The dehydrating washing machine as a conventional example was developed in the 1980s.
It is shown in Publication No. 31672 (D06F 37/40),
This will be explained based on FIGS. 2 and 3.

101 is a machine frame, 102 is an outer tank, and 103 is a dewatering/washing tank. 104 is a mounting plate that is elastically suspended from the machine frame 101 by a vibration isolator and a hanging rod;
It supports the outer tank 102. On the lower side of the mounting plate 104 are a dehydration tank 103 and a drive unit 10 for the rotor blade 105.
6 and a motor 107 are attached. motor 107
is connected to the pulley 1 of the drive section 106 via the belt 108.
It is connected to 09. 110 is a clutch device that switches the rotation of the rotary blade 105 and the rotation of the washing tub 103.

FIG. 3 shows the structure of the drive section 106, where 111 is an upper cover of the drive section 106, and 112 is a lower cover thereof. Pulley 109 is fixed to pulley boss 113 with bolts 114. 115 is a dehydration tank shaft, which is connected to the upper cover 1 by an upper bearing 116.
11, and its lower end is fixed to an upper gear case 117 that functions as a brake drum, and a lower gear case 118 is fixed with screws 119 to cover the lower surface of the upper gear case 117. A dehydration drive shaft 120 is installed in the lower gear case 118, and the dehydration drive shaft 120
is lower cover 1 by lower bearing 121.
12, and is connected to a pulley boss 113 via a clutch spring, which will be described later. The dehydration tank shaft 115 and the dehydration drive shaft 120 are hollow cylindrical shafts, and have therein a rotor shaft 123 and a washing drive shaft 124 coaxially supported by bearings 122. 124 is pulley boss 1
It is combined with 13.

A roller clutch 125 is disposed around the dewatering drive shaft 120, which allows rotation only in the negative direction, and prevents rotation of the dehydration tank 103 in the anti-dehydration direction. The roller clutch 125 is connected to the housing 12
6, and the housing 126 is screwed onto the lower cover 112.

The clutch device 110 includes a clutch spring 1
27, a pawl wheel 128 disposed around the clutch spring 127, and a clutch piece 129 that engages and disengages from the pawl wheel 128. That is, when the clutch piece 129 is engaged, the pawl wheel 128 is displaced, and at the same time, the lower end of the clutch spring 127 that is engaged with the pawl wheel 128 is displaced in the expanding direction, thereby reducing the power to the dewatering drive shaft 120. Transmission is released.

Thus, the rotation of the motor 107 is controlled by the belt 108.
is transmitted to the pulley 109 via the clutch device 110, and the washing tub 103 is approximately
It rotates at 900rpm, and the rotor blade 105 rotates at approximately 900rpm during washing.
It rotates at 180r.pm.

Now, in such a conventional washing machine, when the rotation of the motor 107 is transmitted to the dehydration drive shaft 120 and the dehydration tank shaft 115, the upper gear case 117 serving as a brake drum also rotates at the same time.
In such a case, there is a problem in that various lubricating oils used in the gear cases 117, 118 and the upper bearing 116 leak out, scatter due to centrifugal force, and adhere to the brake drum surface, reducing braking performance. Ta.

In addition, the upper gear case 117 generally has scratches on the brake drum surface or poor roundness, which causes problems such as abnormal wear of the brake lining that is pressed against the brake drum and generation of unpleasant noises when the brake lining is pressed against the brake drum. Ta.

Therefore, in order to solve these problems, the present applicant has applied for a system in which the gear case and the brake drum are separated (Japanese Patent Application No. 170536/1986).
(No.), and will be explained below based on FIGS. 4 to 6.

Reference numeral 130 denotes a mounting base, to which the motor 107, a drainage electromagnetic valve to be described later, a drainage valve driving solenoid, etc. are attached, and is fixed to the outer bottom surface of the outer tank 102. An upper bearing case 131 is formed on the mount 130, and the upper bearing 116 is supported by the case 131.

The gear cases 117 and 118 include an outer case 133 in which an internal gear 132 is formed, a sun gear 134 to which the washing drive shaft 124 is connected, and four gears interposed between the internal gear 132 and the sun gear 134. Planetary gear 135... and the planetary gear 135...
A so-called planetary gear device 137 is installed therein, and includes a carrier 136 to which the rotor shaft 123 is connected. The planetary gear device 137 loosely fits its outer peripheral case 133 into the upper gear case 117.

138 is a cylindrical brake drum with a bottom;
The upper end surface is open, and the dehydration drive shaft 120 is installed on the lower surface.
It has an insertion opening 139 through which it is inserted. First, with the dehydration drive shaft 120 inserted into the insertion hole 139, the upper gear case 117 is fitted from the upper end surface thereof, and then the upper gear case 117 is fitted from the upper end surface thereof.
The lower gear case 118 is loosely fitted into a rib 140 formed in an annular shape on the outer periphery of the lower end of the lower gear case 7, and finally the three parts are tightened together from below with bolts 141.

Reference numeral 142 designates a lower bearing case made of sheet metal for supporting the lower bearing 121, and a cylindrical holding portion 143 into which the lower bearing 121 is press-fitted is drawn. The holding portion 143 is narrowed deeper than the thickness of the lower bearing 121. A peripheral wall portion 144 of the lower bearing case 142 extends upward in close opposition to the brake drum 138 and has an upper end 14 thereof.
A flange 14 extending horizontally outward from 4a
5, it is fixed to a fixing part 146 hanging down from the mounting base 130 with a bolt 147.

148 is a steel housing that houses the roller clutch 125;
5 on the outer periphery of the dehydration drive shaft 120.

Reference numeral 149 denotes a belt-shaped brake band wound around the drum surface 138a of the brake drum 138, and a brake shoe 150 that presses against the drum surface 138a is disposed on the inner surface. One end of the brake band 149 is fixed to the peripheral wall 144 of the lower bearing case 142 between parallel openings 151 and 152 with a screw, and the other end 153 is folded into a cylindrical shape. It is bent and pivotally supported at the other end of the brake lever 154.

The brake lever 154 is attached to the mounting base 13
0 is supported by a shaft 155, and is normally supported by a spring 156.
The other end 153 of the brake band 149
The brake band 149 is rotated in the direction of pulling the brake band 149 (the direction of tightening the brake band 149).

The mounting base 130 is provided with a drain valve 157 for discharging the washing water in the outer tub 102 and a drain solenoid 1 for opening and closing the drain valve 157.
58 is attached, and the drain valve 157 and the drain solenoid 158 are connected via a connecting body 159, and when the drain solenoid 158 is energized, the connecting body 159 is pulled, and the drain valve 157 is built in. It is opened against the biasing force of a spring (not shown).

Thus, the other end 16 of the brake lever 154
0 is connected to the connecting body 159, and when the drain solenoid 158 is energized, the spring 156
is rotated clockwise in Fig. 5 against the urging force of
This loosens the brake band 149,
The pressure relationship between the brake shoe 150 and the drum surface 138a is released.

FIG. 6 shows the structure of the clutch device 110 and its vicinity. 161 is a clutch lever, and the clutch piece 129 is attached to the tip 162 of the clutch lever 161. The clutch lever 161 is supported coaxially with the brake lever 154, and is normally urged by a spring 163 to rotate in a direction in which the clutch piece 129 engages with the pawl wheel 128.

At the other end 164 of the clutch lever 161,
A locking piece 165 is formed on the other end of the brake lever 154, and a locking piece 166 is formed on the other end of the brake lever 154.
are formed, and the locked piece 165 and the locked piece 166
is arranged at a position where the brake lever 154 is locked when the drain valve solenoid 158 is energized and the brake lever 154 rotates in a direction in which the brake band 149 is loosened. Therefore, the brake lever 154
When the locking piece 166 rotates, the locking piece 166 locks on the locked piece 165, and the clutch lever 161 rotates about the shaft support as a fulcrum against the biasing force of the spring 163, so that the clutch piece 129 is rotated. Said pawl wheel 1
Leaving from 28.

Therefore, during washing, the drain solenoid 1
58 is cut off and the drain valve 157 is closed, the brake lever 154 and the clutch lever 161 also have their respective springs 156, 16
3, the brake band 149 is tightened to apply the brake to the brake drum 138, and at the same time the clutch piece 129 is
engages with the pawl wheel 128. Therefore, the rotational force of the motor 107 is not transmitted to the dehydration drive shaft 120, and only the rotary blade 105 rotates.

- On the other hand, during dewatering, the drain solenoid 158
is excited and the drain valve 157 is opened, so the movement of the coupling body 159 causes the brake lever 154 to open.
is rotated in the direction in which the brake band 149 is loosened, the brake is released, and at the same time the clutch lever 1
61 rotates, and the clutch piece 129 moves to the pawl wheel 1.
Leaving from 28. Therefore, the rotational force of the motor 107 is transmitted to the dehydration drive shaft 120, and the dehydration tank 103 is rotated.

(c) Problems to be solved by the invention In the conventional washing machine, the oil leaking from the gear device can be blocked by the inner wall of the brake drum 138 to prevent it from adhering to the drum surface 138a.
Due to the shape of the brake drum 138 (bowl shape), when the brake drum 138 rotates at high speed, it may resonate and generate an unpleasant sound (this is especially noticeable when the brake drum 138 is made of sheet metal and is relatively thin). Therefore, it is necessary to attach a member for absorbing resonance noise to the inner surface of the brake drum 138, which increases component costs and work costs.

In addition, due to the squeezing force of the brake band 149,
There is also the problem that the brake drum 138 is deformed, reducing its braking ability.

In view of these problems, the present invention aims to obtain good braking performance over a long period of time in a dehydrating washing machine and to reduce costs.

(d) Means for solving the problem The dehydrating washing machine of the present invention includes a dehydrating tank shaft for supporting the dehydrating tank, a gear case provided at the lower end of the dehydrating tank shaft, and a gear case installed inside the gear case. The apparatus is equipped with a cylindrical brake drum for applying a braking force to the rotation of the dehydration tank shaft, and a press-fitting part for press-fitting into the brake drum is provided in the gear case.

(E) Function: In other words, the brake drum is supported from the inside by press-fitting the gear case against the vibration of the brake drum during dehydration and external pressure on the brake drum, so the brake drum does not resonate and is not easily deformed. .

(f) Embodiments Examples of the present invention will be described based on the drawings. However, the parts whose explanation is omitted have the same structure as the conventional one.

In FIG. 1, the upper gear case 117 includes:
An annular groove 1 is formed along the outer periphery. The bottom of the groove 1 reaches near the lower end of the upper gear case 117, so that the outer periphery has a double wall structure of an inner wall 2 and an outer wall 3. A step portion 4 into which the lower gear case 118 is fitted is formed at the lower end of the upper gear case 117.

The outer diameter of the outer wall 3 is the same as that of the brake drum 1.
Its dimensions are set so as to have a small gap t with the inner diameter of 38, and furthermore, by forming the upper part of the outer wall 3 thickly, a press-fitting part 5 that projects outward is provided. The degree of protrusion of the press-fit portion 5 is set such that the diameter of the upper gear case 117 is slightly larger than the inner diameter of the brake drum 138 at the press-fit portion.

The brake drum 138 is made of sheet metal to increase wear resistance, and the upper gear case 117, which has a complicated shape, is made of aluminum die-casting to facilitate machining.

Further, the upper end of the brake drum 138 is provided with a bent portion 6 to increase its strength, and the drum surface is nitrided to harden the surface.

Then, the outer peripheral case 133 of the planetary gear device 137 is press-fitted into the inner surface of the inner wall 2 from below, and in this state, the upper gear case 117 (outer wall 3) is fitted into the brake drum 138 from above. The upper gear case 117 is then press-fitted into the brake drum 138 at the press-fitting part 5. At the time of this insertion, the lower gear case 11
8 fits into the stepped portion 4 and extends from the outer bottom surface of the brake drum 138,
The lower gear case 118 and the outer peripheral case 133 are tightened together with the screws 7.

With the above configuration, the present embodiment has the following effects.

(a) The press-fit part 5 is provided at the upper part of the outer wall 3, and the lower part is made smaller in diameter than the brake drum 138, so that the blade ram 13 of the upper gear case 117
8 is easy to insert.

(b) Since the upper gear case 117 is press-fitted into the upper end of the brake drum 138, the brake drum 138 does not vibrate and generate resonance noise during dehydration rotation, and in addition, the shaft and the brake drum 13
8, the dimensional accuracy is higher.

(c) Furthermore, since the brake drum 138 can be supported from inside by the upper gear case 117 against external pressure, the brake drum 138 is less likely to deform. Therefore, the tightening force of the brake band 149 can be increased by about 20 kg/cm ² compared to the conventional one (80 kg/cm ² ), and the braking ability is improved accordingly.

(d) By providing the groove 1 on the outer periphery of the upper gear case 117, the press-fitting work becomes easier and the weight can be reduced.
49 The frictional heat generated during tightening can be air cooled from the inside.

FIG. 7 shows a second embodiment, in which the lower end protrusion 8 of the upper gear case 117 is fitted into a fitting hole 9 provided on the bottom surface of the brake drum 138 to further strengthen the rotation prevention. be.

FIG. 8 shows a third embodiment, in which a press-fitting part 10 is also provided at the lower end of the upper gear case 117. Although the ease of inserting the upper gear case 117 is inferior to that in the first embodiment, it is compensated for by providing the inclined guide part 11 in the press-fitting part 10, and since it is supported at two points by the upper and lower press-fitting parts 5 and 10, the upper gear case 117 can be easily inserted. The gear case 117 does not tilt and the brake drum 138
There is also full support from within.

FIG. 9 shows a fourth embodiment, in which the lower part of the brake drum 138 is squeezed to provide a small diameter part 12, and the upper gear case 117 is press-fitted into this small diameter part 12 and the upper end. As a result, the brake drum 1 of the upper gear case 117
38 is easy, and the brake drum 138 can be supported vertically.

(G) Effects of the invention This invention prevents oil from adhering to the drum surface because even if oil leaks from the gear device etc. of a dehydrating washing machine, it is blocked by the inner wall of the brake drum. This can prevent the deterioration of braking ability due to

Furthermore, since the gear case is press-fitted into the brake drum to support the brake drum from the inside, it is possible to prevent the generation of resonance noise of the brake drum during dewatering without the need for a separate member. Since the brake drum is less likely to deform, good braking ability can be maintained over a long period of time.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts of the dehydrating washing machine of the present invention, Fig. 2 is an internal mechanism diagram of a conventional dehydrating washing machine, Fig. 3 is a sectional view of the drive mechanism, and Fig. 4 is Figures equivalent to Figure 3, Figures 5 and 6 in other conventional examples
The figures are respectively a sectional view of the main part in FIG. 4, FIGS. 7 to 9 are views corresponding to FIG. 1 in other embodiments, FIG. The figure is a sectional view taken along the line BO in FIG. 5...Press-fitting part, 103...Dehydration/washing tub (dehydration tank), 115...Dehydration tank shaft, 117...Upper gear case, 118...Lower gear case, 137...
Planetary gear device (gear device), 138...Brake drum.

Claims (1)

[Scope of utility model registration request] A dehydration tank shaft for supporting the dehydration tank shaft, a gear case provided at the lower end of the dehydration tank shaft, a gear device installed inside the gear case, and a cylinder for applying a braking force to the rotation of the dehydration tank shaft. The gear case is inserted into the brake drum, and a press-fitting part is formed protrudingly on the outer circumferential surface of the gear case, and the diameter of the gear case is larger than that of the brake drum at the press-fitting part. A dehydrating washing machine characterized in that the gear case is configured to have a larger inner diameter than the inner diameter of the brake drum, and the press-fitting portion is press-fitted into the inner surface of the brake drum when the gear case is inserted into the brake drum.