JPH0319354Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a washing machine, and particularly to a mechanism for reducing the rotational speed of a rotary blade (washing blade) of a fully automatic washing machine or the like.

<Prior art> In conventional fully automatic washing machines, a dehydration tank and a rotor (impeller) are coaxially combined, and only the rotor is rotated by a combination of a motor's forward and reverse rotation and a planetary gear. to perform the washing action, or
The rotary blades and dehydration tank were rotated at high speed at the same time to perform dehydration.

That is, in a conventional washing machine, as shown in FIG. 5, only the rotor of the driven shaft 2 is transmitted from the pinion 3 of the drive shaft 1 on the drive source side to the planetary gear 4 pivotally supported on the arm on the driven shaft 2 side. Turn it to perform the washing operation (at this time, the housing 5 is stopped). During dewatering, the motor is reversed, and the entire housing 5 is rotated via the spring clutch (the drive shaft 1 and the driven shaft 2 are also rotated together), and the dewatering operation is performed by rotating together with the dehydration tank directly connected to the housing 5. I was doing it. Note that 6 in the figure is a ring gear formed on the inner circumferential wall of the housing 5.

The relationship between the rotation speed N1 of the drive shaft 1 and the rotation speed N2 of the driven shaft 2 was N1=(1+T6/T3)N2. Here, T3 is the number of teeth of pinion 3, T6
is the number of teeth of the ring gear 6, and the reduction ratio of the conventional reduction gear was about 5:1.

As a basic function of a washing machine, there is a demand for the rotation speed of the rotor blade to be lowered during washing because it is evaluated as having less fabric staining, but on the other hand, there is a requirement that the rotation speed of the rotor blade cannot be lowered during spin-drying due to the dehydration performance. There is. In order to further increase the conventional reduction ratio (5:1), it is necessary to increase the size of the gear housing itself, which requires major design changes and a new mold. Furthermore, such a design change would result in a loss of dimensional compatibility with existing ones.

<Purpose> In view of the above, the present invention is capable of changing the reduction ratio from 5:1 to 6 to 9:1 by changing the internal structure without drastically changing the external dimensions, thereby reducing the rotational speed of the rotor blade. Another object of the present invention is to provide a washing machine in which the spin speed can be kept unchanged.

<Example> An example of the present invention will be described below based on FIGS. 1 to 4. The washing machine according to the present invention has the following features:
An outer tub 11 stretched over a washing machine main body 10, a washing/dehydrating tub 14 with a large number of pores 13, which is rotatably installed in the outer tub 11 around a drive shaft sleeve 12;
A washing rotor 16 rotatably supported in the washing and dehydrating tank 14 via a driven shaft 15, a speed reduction device 18 that reduces the power from the drive source from the drive shaft 17 and transmits it to the driven shaft 15; a housing 20 having a speed reducer 18 therein and fixed to the bottom of the washing/dehydrating tub 14 and transmitting power from the drive source to the washing/dehydrating tub 14 via a spring clutch 19;
The reduction gear device 18 includes the drive shaft 17
a pinion 21 fixed to the pinion 21, a large gear 22 that rotates while meshing with the pinion 21, and the driven shaft 15.
a gear holder 23 which is externally fitted and fixed to and rotatably holds the large gear 22; a planetary gear 24 which is rotatably held by the gear holder 23; Planetary gear 24
and a ring gear 25 that meshes with the ring gear 25.

a transmission device 26 that transmits power to the drive shaft 17;
A first pulley 28 is fitted onto the motor shaft of a motor 27 as a drive source installed at the bottom of the washing machine main body 10, a second pulley 29 is screwed onto the lower end of the drive shaft 17, and both It consists of a transmission belt 30 wrapped around pulleys 28 and 29.

The drive shaft 17 is rotatably fitted and supported in the drive shaft sleeve 12, and the drive shaft sleeve 12 and the second pulley 2
A cylindrical transmission body 31 is interposed between the transmission body 9 and the transmission body 9, and the drive shaft 17 is fitted into the square central hole 32 of the transmission body 31 so as to be able to rotate integrally therewith.

The transmission body 31 and the drive shaft bushing 12
A coiled spring clutch 19 is fitted onto the outside,
Further, a ratchet gear 34 is loosely fitted to the outer circumference thereof, and a plurality of grooves 36 are formed in the central hole 35 of the ratchet gear 34 along the axial direction. and,
The lower end 19a (second pulley 29 side) of the spring clutch 19 is engaged with the lower end of the groove 36,
Further, the upper end 19b of the spring clutch 19 is fixed to the drive shaft bushing 12.

The transmission body 31, the spring clutch 19, the ratchet gear 34, and the L-shaped stopper piece 37 that engages with and separates from the ratchet gear 34 constitute a means for transmitting power to the housing 20, and this means transmits the motor 27 in the normal rotation direction. As a result, the spring clutch 19 is separated from the outer peripheral surface of the transmission body 31 and the drive shaft bushing 12, and the motor 27
Due to the reverse rotation, the transmission body 31 and the drive shaft bushing 1
It is configured to come into pressure contact with the outer circumferential surface of No. 2.

The housing 20 includes a lower case 20A that is externally fitted and fixed to the drive shaft sleeve 12, and a lower case 20A that is externally fitted and fixed to the drive shaft sleeve 12, and
The upper case 2 is externally fitted and fixed to the driven bearing sleeve 38 of No. 5.
Both cases 20A and 20B are fixed with bolts 39. A brake band 40 and a stopper band 44 are attached to the outer peripheral surface of the lower case 20A. Further, there is a gap S between the inner peripheral surface of the lower case 20A and the lower surface of the upper case 20B.
An annular wall 41 is formed, and the ring gear 25 is formed on the inner peripheral surface of the annular wall 41.

The brake device 42 that controls the rotation of the housing 20 is controlled by a control device (or timer).
A solenoid 43 that turns ON and OFF, the L-shaped stopper piece 37 that moves left and right as the solenoid 43 turns on and off, and a pressing force that is fixed to the stopper piece 37 and presses against and separates the brake band 40 and stopper band 44 of the housing 20. Piece 44
a and the stopper piece 37 to the brake band 40.
It is composed of a spring 45 that biases the spring 45 toward the side.

The gear holder 23 has a central portion screwed onto the driven shaft 15 via a bolt 46, and a shaft 47 is freely rotatable via a bush 48 on three arms 23a extending radially from the central portion. is supported by
The large gear 22 is fixed to the lower end of the shaft 47, and the planetary gear 24 is fixed to the upper end of the shaft 47.

Then, the driven shaft 15 and the drive shaft 1 of the reduction gear 18
The following relationship holds true for the rotation speed of 7.

N1=(1+T ₂₅ T ₂₂ /T ₂₁ T ₂₄ )N2 Here, N1 is the rotation speed of the drive shaft 17, N2 is the rotation speed of the driven shaft 15, T ₂₁ is the number of teeth of the pinion 21, T ₂₂
is the number of teeth of the large gear 22, _T24 is the number of teeth of the planetary gear 24, and _T25 is the number of teeth of the ring gear 25.

In the above configuration, when the motor 27 rotates forward,
The rotation of the pulley 29 causes the drive shaft 17 to rotate, and the pinion 21 to rotate. At this time, the ratchet gear 34
The rotation of the spring clutch 19 is stopped by a stopper piece 37, and the lower end 19a of the spring clutch 19 has a groove 35 of the ratchet gear 34, which loosens (slips) when the motor 27 rotates forward, so that the transmission body 31 rotates. is not transmitted to the drive shaft sleeve 12.
At this time, the housing 20 is prevented from rotating because the brake band 40 and the stopper band 44 are pressed by the stopper piece 37.

The pinion 21 is reduced by one step by the large gear 22,
The large gear 22 rotates a planetary gear 24 via a shaft 47, and since the planetary gear 24 meshes with a ring gear 25 (outer gear) machined in the housing 20, it freely rotates while meshing with the ring gear 25. Since the shaft 47 is supported by the gear holder 23, the rotational force of the planetary gear 24 is transmitted from the gear holder 23 to the driven shaft 15, causing the driven shaft 15 to rotate. Therefore, the rotary blade 16 at the tip of the driven shaft 15 rotates at a constant reduction ratio, thereby achieving a washing action.

When dewatering, reverse the motor 27 and turn the solenoid 4
3 is turned ON, the stopper piece 37 is drawn toward the solenoid side, and the stopper band 44 and brake band 40 are loosened, so that the housing can freely rotate, and the ratchet gear 34
It also starts to spin idly. There is a slight gap between the outer peripheral surfaces of the transmitting body 31 and the drive shaft sleeve 12 and the inner diameter of the spring itself of the spring clutch 19, and by reversing the rotation, the rotational force from the transmitting body 31 is transmitted to the spring clutch 19, and the spring clutch 1
In order to wind 9 so as to work in the tightening direction, the transmitter 31
and the drive shaft bushing 12 are fixed by a spring. Therefore, the pulley 29, the drive shaft 17 and the drive shaft sleeve 12 rotate together, the housing 20 integral with the drive shaft sleeve 12 rotates, and the housing 2
The dehydration tank integrated into 0 will rotate.

Further, since the drive shaft receiver 12 and the drive shaft 17 rotate integrally and the housing 20 rotates, the reduction gear 18, which has a large reduction ratio and a large engagement between gears, rotates integrally with the housing 20. Become. That is, during dehydration, both rotate at high speed as a unit to perform the dehydration action.

Note that the forward and reverse operations of the solenoid 43 and the motor 27 are linked by a control device (not shown), and washing or dehydration is performed depending on whether they are connected via the planetary gear 24 or directly. In addition, the gap S between the annular wall 41 of the ring gear 25 that meshes with the planetary gear 24 and the housing 20 serves to prevent meshing noise from being transmitted directly to the housing 20, and thus also helps reduce gear noise.

In this way, by combining simple gears, it is possible to obtain washing effects that meet recent needs.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects> As is clear from the above explanation, the present invention consists of a washing rotor blade rotatably supported in a washing/dehydration tank through a driven shaft, and a washing rotor blade rotatably supported in a washing/dehydration tank via a driven shaft, and a driving shaft that decelerates the power from a drive source. and a housing that houses the speed reducer and is fixed to the bottom of the washing and dehydrating tank so as to transmit the power of the driving source to the washing and dehydrating tank. A pinion fixed to a shaft, a large gear that rotates in mesh with the pinion, a planetary gear coaxially supported so as to be able to rotate integrally with the large gear, and a planetary gear that is externally fixed to the driven shaft and is connected to the large gear. The gear holding body rotatably holds the planetary gear, and a ring gear is formed on the inner peripheral surface of the housing and meshes with the planetary gear.

Therefore, according to the present invention, the large gear meshing with the pinion reduces the speed by one step, and the planetary gear, which is coaxially supported with the large gear, rotates and revolves around the ring gear, resulting in further deceleration. Compared to conventional reduction gears, the reduction ratio can be significantly increased from the conventional reduction ratio of 5:1 to 6:1 or 9:1 without changing the external dimensions of the housing, which reduces rotation during washing. It has the advantage of being able to reduce the rotational speed of the blades.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a fully automatic washing machine showing an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of the gear unit of the reduction gear, Fig. 3 is a sectional view of the gear unit of the present invention, and Fig. 4 3 is a sectional view taken along the line AA in FIG. 3, and FIG. 5 is a partially cutaway perspective view of a conventional speed reduction device. 10...Washing machine main body, 11...Outer tub, 12...
Drive shaft bushing, 13... Pore, 14... Washing and dehydrating tank, 15... Driven shaft, 16... Washing rotor, 17
... Drive shaft, 18 ... Reduction device, 19 ... Spring clutch, 20 ... Housing, 21 ... Pinion, 22 ... Large gear, 23 ... Gear holder,
24... Planet gear, 25... Ring gear.

Claims (1)

[Scope of utility model registration request] a washing rotor rotatably supported in a washing and dehydrating tank through a driven shaft; a speed reduction device that reduces power from a drive source from the drive shaft and transmits it to the driven shaft; a housing fixed to the bottom of the washing and dehydrating tank so as to transmit power of a drive source to the washing and dehydrating tank; a large gear, a planetary gear coaxially supported so as to be able to rotate integrally with the large gear, a gear holder that is externally fitted and fixed to the driven shaft and rotatably holds the large gear and the planetary gear; A washing machine comprising a ring gear formed on an inner peripheral surface of a housing and meshing with the planetary gear.