JPH0431720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a braking device for a dehydrator comprising a band brake.

(Prior Art) Conventionally, as a braking device for this type of dehydrator, the one shown in FIG. 2 has been used. In this system, a brake ring 3 is tightly wound around a brake drum 2 provided on a dehydration shaft 1 by its own elastic force. Based on this, the brake ring 3 is locked by the lever 6 which is rotated as shown by arrow A in the figure by the spring force of the spring 5, thereby generating a frictional braking force between the brake ring 3 and the brake drum 2. , the dehydration tank which rotates integrally with the dehydration shaft 1 is stopped.

However, in the above-described structure, since the brake ring 3 is instantly stopped while it is rotating at high speed together with the brake drum 2, there is a problem that a large impact noise is generated during braking, and the lever 3 If the strength is insufficient, there is a risk that the lever 3 may be damaged and the brake device may become inoperable.

Therefore, it has been considered to use a braking device shown in FIG. 3 instead of the above-mentioned braking device. This involves wrapping a brake band 9 around the brake drum 2, with one end attached to the fulcrum shaft 8 of the lever 7, and the other end of the brake band 9 attached to the lever 7.
It is attached to the tip of the electromagnet 1 during braking.
0, the lever 7 is rotated as shown by arrow B in the figure by the spring force of the spring 11,
This tightens the brake band 9 and brings it into pressure contact with the brake drum 2, thereby stopping the brake drum 2 and the dehydration tank. This is called a band brake, and reduces the generation of impact noise as described above as well as functional reliability. This can solve problems such as the lack of.

Incidentally, in this case, the magnitude of the braking force is determined by the magnitude of the clamping force of the brake band 9 against the brake drum 2, and the magnitude of the clamping force is determined by the magnitude of the spring force of the spring 11. However, it is not possible to increase the spring force of the spring 11 due to the relationship with the electromagnet 10 (if the spring force of the spring 11 is increased, the electromagnet 10 that attracts the lever 7 against the spring force will also become correspondingly stronger). Therefore, the tightening force of the brake band 9 against the brake drum 2 is suppressed to a certain extent, and the braking force is not sufficiently large. Therefore, in this product, if oil such as grease dripping from various parts such as bearings above the brake band 9 adheres to the inner surface of the brake band 9, the braking force will decrease due to slipping, resulting in an actual lack of braking force. The problem was that it appeared as

(Problems to be Solved by the Invention) As mentioned above, the conventional idea of simply using a band brake can solve the problems such as generation of impact noise during braking and lack of functional reliability. However, there was a problem in that the influence of oil dripping from various parts above the brake band was large, making it impossible to obtain the actually necessary braking force.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide necessary control for oil dripping from various parts above the brake band in a band brake. An object of the present invention is to provide an excellent braking device for a dehydrator that can maintain power.

[Structure of the Invention] (Means for Solving the Problems) The braking device for a dehydrator of the present invention includes a brake drum provided on a dehydration shaft that drives a dehydration tank, and a brake band that brakes this brake drum. This is characterized in that the brake drum is provided with an eaves portion that covers the brake band from above and projects outward from it.

(Operation) According to the above means, the eaves block oil dripping from various parts above the brake band, and prevent it from adhering to the inner surface of the brake band.

(Example) Hereinafter, an example in which the present invention is applied to a braking device for a washing machine with a dehydrating function will be described with reference to FIG.

In the figure, numeral 21 denotes a water tank, which is supported by an elastic suspension mechanism (also not shown) inside an outer box (not shown). 22 is exclusively the water tank 21
An upper housing 23 is located below the water receiving tank 21 and is attached to the bottom center of the water tank 21.
A bearing 24 is fitted into the upper housing 22, and a bearing 25 is fitted into the lower housing 23. 26 is a dehydration shaft rotatably supported by both housings 22 and 23 by bearings 24 and 25, and this has a hollow short shaft 27 at its upper end.
The upper hollow shaft 28 and the lower hollow shaft 29, each of which is fitted with The lower hollow shaft 29 is connected to the upper hollow shaft 28 by fixing its lower end to the disk portion 29a at the upper end of the lower hollow shaft 29. 31
2 is a dehydration tank which is disposed inside the water receiving tank 21 and is also used as a washing tub, and is attached to the short shaft 27 of the dehydration tank 26. A stirring blade 32 is disposed at the inner bottom of this dehydration tank 31, and this is connected to the upper hollow shaft 2 of the dehydration shaft 26.
It is attached to the upper end of a washing shaft 34 which is rotatably inserted and supported through a bearing 33 at 8. Reference numeral 35 denotes a drive shaft rotatably inserted into and supported by the lower hollow shaft 29 of the dewatering shaft 26 via a bearing 36, and a pulley 38 integrated with a boss shaft 37 is fitted into the lower half of this drive shaft. The pulley 38 is connected to a pulley of a motor (not shown) via a belt 39. A well-known planetary gear mechanism 4 is installed in the brake drum 30 to transmit the rotational force of the motor to the washing shaft 34 during washing.
0 is arranged, and also the boss shaft 37 and the lower hollow shaft 2
A clutch spring 41 is wound between the clutch spring 41 and the dewatering shaft 26 for transmitting the rotational force of the motor to the dewatering shaft 26 during dewatering. Reference numeral 42 denotes a brake band for braking the brake drum 30, which corresponds to the brake band 9 shown in FIG. The other end is attached to the tip of the lever 43. A spring corresponding to the spring 11 shown in FIG. 3 is attached to the base end (not shown) of the lever 43, and an electromagnetic plunger corresponding to the electromagnet 10 shown in the same figure is connected on the opposite side. .

45 is a bolt 4 which is fitted to the brake drum 30
6 to stop the brake drum 30.
The brake band 42 is wrapped around the outer periphery of the drum cover with a shoe 47 interposed therebetween. Further, an insertion hole 48 for assembling is formed in the center of the bottom of the drum cover 45, and an oil receiver 49 is formed around the insertion hole 48, which is one step lower than other parts. 50 is the dehydration shaft 26
A spring for preventing tank reversal is wound around a portion of the lower hollow shaft 29 directly below the brake drum 30, and the oil receiving portion 49 of the drum cover 45 faces this, and the bearing 25 is directly below the spring. is located. On the other hand, in the upper peripheral part of the brake drum 30,
By the flange part of the upper edge of the drum cover 45,
A canopy part 51 is provided, which covers the brake band 42 from above and projects outward from it, with an outer peripheral edge part 51a directed downward.

Now, in the case of the device configured as described above, its operation is the same as that shown in FIG. Based on the power cut, the lever 43 is rotated by the spring force of a spring (not shown) corresponding to the spring 11, thereby tightening the brake band 42 and bringing it into pressure contact with the drum cover 45, and attaching the drum cover 45. The brake drum 30 and the dehydration tank 31 attached to the dehydration shaft 26 are stopped. On the other hand, when the brake is released (during dehydration), the electromagnet is energized and the lever 43 is rotated in the opposite direction to that described above against the spring force, thereby loosening the brake band 42 and releasing the drum. Released from pressure against the cover 45,
Brake drum 3 covered with the drum cover 45
In turn, the dehydration tank 31 attached to the dehydration shaft 26 is released.

During the above-described operation, oil such as grease applied to various parts such as the bearing 24 above the brake band 42 and dripping from them is removed from the brake drum 30 in the case of this configuration.
The eaves portion 51 provided on the brake band 42 prevents it from adhering to the inner surface of the brake band 42. In this way, even in the case of a band brake structure in which the braking force cannot be increased sufficiently, the actually necessary braking force can be maintained. Although the braking device having the band brake structure has the problem of not being able to sufficiently increase the braking force as described above, this can be compensated for by increasing the braking time, so that the braking effect is not insufficient.

In addition, especially in the case of the structure described above, the eaves portion 51
Since the outer periphery of the brake band 42 is configured to be directed downward, the oil received by the eaves 51 can be dripped from the outer periphery that is oriented downward, making it more reliable that the oil adheres to the inner surface of the brake band 42. Since it is possible to prevent this from happening, it is possible to obtain an even better effect in maintaining the necessary braking force.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and is particularly applicable as a whole to a dehydrator side of a dual-tub washing machine, for example, to a dehydrator side of a dual-tub washing machine. It may be implemented with appropriate changes within the scope.

[Effects of the Invention] As is clear from the above description, according to the dehydrator braking device of the present invention, the brake drum provided on the dehydration shaft that drives the dehydration tank, the brake band that brakes this brake drum, In what constitutes a band brake, the brake drum includes:
Since a canopy part is provided that covers the brake band from above and projects outward from it, it is possible to solve problems such as generation of impact noise during braking and lack of functional reliability. In addition, the necessary braking force can be maintained even in the face of oil dripping from various parts above the brake band, resulting in the excellent effect of being able to obtain reliable braking performance. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the main parts showing an embodiment of the present invention, FIG. 2 is a schematic plan view of a conventional braking device, and FIG. 3 is a schematic plan view of a braking device having a band brake structure. In the figure, 26 is a dehydration shaft, 30 is a brake drum,
31 is a dehydration tank, 42 is a brake band, 51 is an eaves portion, and 51a is an outer peripheral edge of the eaves portion.

Claims (1)

[Scope of Claims] 1. A band brake is constituted by a brake drum provided on a dehydration shaft that drives a dehydration tank and a brake band that brakes this brake drum, and the brake band is attached to the brake drum. A braking device for a dehydrator, characterized in that a canopy part is provided that covers the canopy from above and projects outward from the canopy part. 2. The braking device for a dehydrator according to claim 1, wherein the eave portion has an outer peripheral edge directed downward.