JPH0411667Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The present invention relates to a single-tank dehydrating washing machine that performs washing and dehydration in the same tank, and particularly relates to an improvement of a device for preventing the dehydrating shaft from reversing in its mechanism. It is something.

Conventional technology As shown in Fig. 4, this type of conventional dehydrating washing machine has a washing/dehydrating tank 2 provided inside a water tank 1 for storing water during washing, a pulsator 3 for stirring clothes at the center inner bottom, and a pulsator 3 for stirring clothes on the side wall. It has many small holes for draining water. Reference numeral 5 denotes a bearing box having a mechanism for transmitting the driving force of the motor 6 so as to rotate only the pulsator 3 during washing, and to rotate the washing and dewatering tub 2 during dewatering.
Further, the motor 6 transmits driving force to the bearing box 5 through a belt 7 and a pulley 8.

9 is the drain valve of water tank 1, 10 is the brake arm,
11 is a solenoid that pulls the drain valve 9 and the brake arm 10; 12 is a support plate on which the water tank 1, motor 6, bearing box 5, etc. are arranged; There is. 15 is a balancer installed at the top of the washing and dehydrating tank, 16
is a drain hose.

Inside the bearing box 5 are rotating mechanisms such as a washing shaft for rotationally supporting the pulsator 3 or a dehydration shaft for rotating the washing and dehydration tank 2 for dehydration, as well as bearings for these or for switching the washing and dehydration operation. It is equipped with a clutch mechanism, a brake mechanism to prevent the washing and dehydrating tub from rotating during washing, and a dewatering brake mechanism to stop the washing and dehydrating tub during dehydration.

As shown in FIG. 4, the bearing box portion is provided with a flange 17 fixed to the outer bottom of the washing/dehydration tub 2 and a dehydration shaft 18 fixed thereto, as shown in FIG. It supports the rotating washing shaft 19 of the pulsator 3 described above. Inside the bearing box 5 below the dewatering shaft 18, a motor 6 is installed to obtain a washing rotation diagram.
The dehydration shaft 18 includes a gear reduction device 20 for reducing the rotation speed to an appropriate rotation speed.
Brake drum 2 fitted and crimped to the lower outer periphery of
1, and a gear case 22 containing a gear reduction device 20 together with the brake drum. The lower part of the gear case 22 forms a dewatering drive shaft 24 in which a washing drive shaft 23 is rotatably installed.

The dehydration shaft 18, brake drum 21, gear case 22, and dehydration drive shaft 24 described above have a washing rotation transmission mechanism inside and are also a dehydration shaft system that spins the washing spindle 2 to spin out water. It is rotatably supported by an upper bearing 26 fitted into an upper bearing box 25 and a lower bearing 28 fitted into a lower bearing box 27.

A brake band 30 having a brake shoe 29 fixed to the inner surface is removably wound around the outer periphery of the brake drum 21. One end of the brake band 30 is fixed to the lower bearing box 27, and the other end is pivotally supported by a pin 31 attached to the tip of the brake arm 10. The brake arm 10 is rotatably supported on a shaft 32 mounted on a lower bearing box 27. The brake band 30 is attached to and detached from the brake drum 21 by rotation of the brake arm 10. The brake arm 10 is biased in a predetermined direction by a spring 33 or the like, and the brake band 30 is pressed against the brake drum 21.
are becoming closer to each other.

A washing drive shaft 2 is attached to the lower end of the bearing box 5 during washing.
3 is provided with a clutch mechanism 34 for switching the dehydration drive shaft 24 to rotate during dehydration.

In the above band brake, the brake band 30
Since it has a strong braking force in the winding direction, it can be used as a braking force at the end of one-way rotation (spin-driving rotation) of the washing and spin-drying tub 2. On the other hand, during washing, the pulsator 3 generally rotates in forward and reverse directions;
The clothing inside rotates with the rotation of the pulsator 3 and generates rotational force in the washing and dehydration tank 2 due to contact friction, and this rotational force is transmitted via the dehydration shaft 18 to
The signal is transmitted to the brake drum 21. In this case, as described above, when the brake band 30 rotates in the winding direction, a strong braking force is obtained, so the rotation of the washing/dehydration tub 2 is small, but the rotation in the direction in which the brake band 30 loosens, that is, the anti-dehydration If it is in the rotational direction, the washing and dehydrating tub 2 will rotate. When this rotation occurs, the relative rotational force between the clothes and the washing/dehydrating tub 2 decreases, resulting in a decrease in cleaning power.

In order to solve this problem, the cylindrical part 35 at the upper part of the brake drum 21, which is the connection part to the dehydration shaft 18,
A coil spring 36 that can be loosened in the direction of dehydration is wound around the outer circumference of the clutch to form a spring clutch that can rotate in one direction. This coil spring 3
One end of the brake arm 6 is locked to the aforementioned brake arm shaft 32. Due to the action of this spring clutch, the rotation of the dehydration shaft 18 and the washing/dehydration tub 2 is reduced when the pak sweater 3 rotates in the anti-dehydration rotation direction, thereby preventing a decrease in washing power.

Problems to be solved by the invention In the above configuration, the brake drum 2
1 and the coil spring 36 of the spring clutch are in frictional contact in the spring relaxation direction when the dewatering shaft 18 rotates, resulting in an extremely large loss of torque. The fever is also large. Further, although this sliding portion is coated with grease in order to reduce the friction as much as possible, this may also become depleted due to heat generation, resulting in unstable performance.

Furthermore, in recent years, there has been a trend to increase the number of times the pulsator is reversed to prevent cloth tangling, and as washing machines have become larger, the load has increased, so the safety factor against metal fatigue of the coil spring 36 is extremely small. I'm getting old.

Means for Solving the Problems The dehydrating washing machine of the present invention consists of a part of the brake drum or a connected part in order to prevent the washing and dehydrating tub from rotating in the anti-dehydrating rotation direction as described above. A cylindrical sleeve having greater surface hardness and lower surface roughness and cylindricity than the cylindrical portion is fitted around the outer periphery of the cylindrical portion, and a one-way roller clutch is fitted to the outer periphery of the sleeve. , further accommodated and supported by a clutch housing.

Function With this configuration, the one-way roller clutch can be used as a means for preventing rotation of the dehydration shaft 18 in the anti-dehydration rotation direction, and since the roller clutch and the dehydration shaft come into rolling contact during dehydration, Frictional resistance is low, so shaft torque loss and heat generation are also extremely low. moreover,
Roller clutches are generally resistant to repeated fatigue and can provide a reliable anti-rotation mechanism.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. In FIG. 1, a cylindrical sleeve 50 having an outer circumferential surface with a surface hardness of Hv500 or more and a surface roughness of Rmax 3μ or less is fitted onto the outer circumference of the cylindrical portion 35 at the upper part of the brake drum. The length of this sleeve 50 is approximately 0.1 to 3 mm shorter than the length of the cylindrical portion 35, and its upper end surface is aligned with the upper end surface position of the cylindrical portion 35. or,
After this sleeve 50 is fitted into the cylindrical portion 35, its cylindricity is maintained at 5μ or less.

The dewatering shaft 18 is press-fitted into the cylindrical portion 35.
In this case, since the lower part of the cylindrical part 35 is integrally formed so as to be continuous with the brake wheel 21, the cylindrical part 35 should originally be constant throughout the entire length.
Generally, due to the press-fitting of the dewatering shaft 18, the diameter of the upper part is smaller than the diameter of the brake wheel side (lower part), and the cylindricity after press-fitting the sleeve 50 cannot be satisfied to be 5μ or less. Therefore, the press-fitting allowance for the dewatering shaft 18 in the cylindrical portion 35 is such that the lower part is larger than the upper part to maintain cylindricity.

Reference numeral 42 designates a clutch housing to be fixed with respect to the machine frame, and in this case is fixed to the flat surface of the upper bearing box 25. 43 is a roller clutch fitted into the clutch housing 42, which has a plurality of ratchet grooves 47 as shown in FIG.
are continuously formed on the inner circumferential surface, and one cylindrical roller 48 is rotatably disposed in each ratchet groove 47 to have the same configuration as a roller bearing, and each roller 48 is connected to the brake drum 21. It is adapted to come into contact with the outer peripheral surface of the cylindrical portion 35 . Further, the inside of the roller clutch 43 is coated with grease to prevent noise caused by rotation and to prevent rust.

In the above configuration, when the dehydration drive shaft 24, gear case 22, brake drum 21, and dehydration shaft 18 rotate integrally in the dehydration rotation direction during dehydration, the third
As shown in Figure a, each roller 48 of the roller clutch 43 moves from the shallow surface of the ratchet groove 47 to the deepest part, is released from restraint, and can freely rotate. At this time, since the surface of the sleeve 50 with which each roller 48 is in rolling contact has extremely low surface roughness and cylindricity, no contact noise is generated. In addition, the clothes rotated by the rotation of the pulsator 3 during washing generate rotational force in the washing/dehydration tank 2 due to contact friction, and this tank 2 rotates in the direction in which the brake band 30 loosens, that is, in the anti-dehydration rotation direction. In this case, as shown in FIG. 3b, the roller 48 is attracted to the shallow surface of the ratchet groove 47 and is pressed against the sleeve 50, and by restraining it, the cylindrical portion 35 of the brake drum 21 and the sleeve 50 are pressed against it. The connected dehydration shaft 18, and therefore the washing and dehydration tub 2, do not rotate, thereby preventing the cleaning power from decreasing. At this time, the roller 48 is strongly pressed against the sleeve 50, but since the sleeve 50 has extremely high surface hardness, it is not deformed.

In the embodiment described above, the sleeve serving as the roller bed of the roller clutch is the brake drum 21.
However, depending on the design, this may be attached to the dehydration shaft 18 or the dehydration drive shaft 24.
The same effect can be achieved even if it is provided in any part of the dewatering shaft system connected to the drum, such as a part of the drum.

Effects of the Invention As is clear from the above examples, the present invention has a sleeve with a large surface hardness and a small surface roughness and cylindricity attached to the outer periphery of the cylindrical part of the brake drum.
By fitting a one-way roller clutch thereto, it is possible to realize a reliable and efficient clutch mechanism for preventing rotation of the tub during washing, which has low shaft torque loss and heat generation due to it, and has excellent fatigue strength. Furthermore, the contact noise of the clutch roller can be reduced compared to the case where the one-way clutch is directly attached to the dewatering shaft or cylindrical portion without a sleeve having excellent surface characteristics. Furthermore, simply by increasing the diameter of the sleeve, a roller clutch with a large load capacity can be applied.
It is also possible to realize a washing machine that uses a common deceleration and clutch mechanism.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a rotating mechanism showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the same main part, and Fig. 3 is a roller for preventing anti-spin rotation of the washing and dehydrating tub of the present invention. This figure shows the operating state of the clutch, where a is a cross-sectional view of the roller clutch showing the operating state when the brake drum directly connected to the dehydration shaft rotates clockwise (dehydration rotation), and b is the brake directly connected to the dehydration shaft. A sectional view of the roller clutch showing the operating state when the drum rotates to the left (anti-spin rotation), Fig. 4 is a sectional view of a conventional dehydrating washing machine, and Fig. 5 is a longitudinal sectional view of the rotation mechanism of the conventional example. It is. 21...Brake drum, 35...Cylindrical part, 4
0...Groove portion, 42...Clutch housing, 43
...Roller clutch, 44...Annular rib, 45...
...Rip portion, 46...Partition member, 50...Sleeve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A washing and dehydrating tank in which a pulsator is arranged at the bottom so that it can freely rotate in both directions, and a dewatering device for rotating this washing and dehydrating tank only in one predetermined direction during the dehydration operation. a brake mechanism including a brake drum connected to the dehydration shaft to stop rotation of the washing/dehydration tank in the predetermined one direction, and a brake mechanism including a brake drum connected to the dehydration shaft or a part of the brake drum. A one-way roller clutch is fitted onto the cylindrical portion, which has a sleeve whose outer periphery serves as a roller bed, the surface hardness of which is greater than that of the cylindrical portion, and whose surface roughness and cylindricity are reduced. and the housing of the roller clutch is fixed with respect to the machine frame, so that the roller clutch prevents the washing/dehydrating tub from rotating in the opposite direction to the one direction during washing. Machine. (2) The surface roughness of the sleeve should be Rmax, 3μ or less,
The dehydrating washing machine according to claim (1) of the utility model registration, characterized in that the surface hardness is Hv500 or more. (3) The utility model according to claim 1, characterized in that the cylindrical portion of the brake drum and the dehydration shaft are press-fitted so that the press-fitting allowance is larger on the lower brake wheel side than on the upper part. Dehydrating washing machine.