JPH0430880B2 - - 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, the above-mentioned structure has a structure that instantly stops the brake ring 3 while it is rotating at high speed together with the brake drum 2, so 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 77 is rotated by the spring force of the spring 11 as shown by the arrow B in the figure, thereby tightening the brake band 9 and bringing it into pressure contact with the brake drum 2, thereby removing the brake drum 2 and the dewatering tank. It is called a band brake, and can solve the above-mentioned problems such as generation of impact noise and lack of functional reliability.

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 device, if oil splashed from various parts (not shown) or bearings around the dehydration shaft 1 adheres to the outer surface of the brake drum 2, the reduction in braking force due to the slippage will reduce the actual braking force. The problem was that it appeared as a shortage.

(Problems to be Solved by the Invention) As mentioned above, the conventional idea of simply using a band brake does not 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 splashing from the area around the shaft 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 maintain the necessary braking force even when oil is splashed from around the shaft in a band brake. To provide an excellent dehydrator braking device that can

[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 the dehydration shaft, and a brake band that brakes the brake drum. The brake drum is covered with a cup-shaped drum cover that receives oil scattered from the surrounding area of the shaft and releases the received oil through the inside and to the outside beyond the area where the brake band contacts. It is characterized by consisting of:

(Function) According to the above-mentioned means, the drum cover prevents oil splashed from the peripheral portion of the shaft from adhering to the brake drum.

(Example) An example in which the present invention is applied to a braking device for a washing machine that also serves as a dehydrator will be described below 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 dewatering tank which is also used as a washing tub and is disposed inside the water receiving tank 21, and is attached to the short shaft 27 of the dehydrating shaft 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 drum cover is cup-shaped and has an insertion hole 4 in the center at the bottom.
7, and an oil receiving portion 48 is formed around the insertion hole 47, which is one step lower than other parts. Reference numeral 49 denotes a spring for preventing tank reversal, which is wound around a portion of the lower hollow shaft 29 of the dewatering shaft 26 directly below the brake drum 30, and the oil receiving portion 48 of the drum cover 45 faces this; The bearing 25 is located directly below. On the other hand, a flange portion 50 projecting outward is formed at the upper end of the drum cover 45.
The brake band 42 is located below the flange portion 50 so as not to protrude outward, and is wrapped around the outer periphery of the drum cover 45 via a shoe 51.

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 dehydration tank 3 attached to the dehydration shaft 26 as well as the brake drum 30
Stop 1. 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. The pressure contact with the cover 45 is released, and the brake drum 30 covered with the drum cover 45 and the dehydration tank 31 attached to the dehydration shaft 26 are released.

During the above-described operation, the spring 49 for preventing tank reversal or the bearing 25 located around the dewatering shaft 26, especially in the vicinity of the brake drum 30, is coated and is coated with the bearing 25 due to centrifugal force. In this embodiment, oil such as grease scattered from them is received by the oil receiving portion 48 of the drum cover 45, and subsequently passes through the inside of the drum cover 45 as shown by arrow C in FIG. It reaches the upper end flange part 50 of the cover 45, in other words, it reaches a position beyond the part where the brake band 42 contacts the drum cover 45. The oil that has reached that position is further dispersed outwardly by centrifugal force as shown by arrow D in the figure. Therefore, the oil does not adhere to the area in contact with the brake band 42, and 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 disadvantage 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, as mentioned above, the wear of the braking part due to long-term use can be countered by replacing the drum cover 45 without replacing the brake drum 30 on the brake drum 30 side. It is possible to improve serviceability.

Although one embodiment of the present invention has been described above, the present invention is not limited thereto, and in particular, the present invention as a whole can be applied to other than dehydrating and dehydrating washing machines, for example, to the dehydrating machine side of a two-tub type washing machine. Other modifications may be made as appropriate without departing from the spirit of the invention.

[Effects of the Invention] As is clear from the above description, the dehydrator braking device of the present invention includes a brake drum provided on the dehydration shaft that drives the dehydration tank, and a brake band that brakes the brake drum. In the case of a band brake, the brake drum has a cup shape that receives oil scattered from the surrounding area of the shaft, and passes the received oil through the inside and outwards at a position beyond the area where the brake band contacts. Since the drum cover is attached to the drum cover, it not only solves problems such as impact noise during braking and lack of functional reliability, but also prevents oil from scattering from around the shaft. Even in this case, the necessary braking force can be maintained, reliable braking performance can be obtained, and serviceability can also be improved.

[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...dehydration tank, 42 a brake band, 43 a lever, 45 a drum cover, and 48 an oil receiver.

Claims (1)

[Claims] 1. A band brake is constituted by a brake drum installed on a dehydration shaft that drives a dehydration tank and a brake band that brakes this brake drum, and the brake drum has a cup-shaped part that scatters from the surrounding area of the shaft. A braking device for a dehydrator, characterized in that the drum cover is attached to a drum cover that receives the oil and releases the received oil to the outside at a position beyond the area where the brake band contacts the brake band.