JPH0523193Y2 - - Google Patents

Description

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

(B) Conventional Technology Conventionally, as a braking device for a washing machine, a brake band has been used, in which a brake shoe is attached to the outer periphery of a brake drum fixed to the drive shaft of a washing and dehydrating tank, and a brake shoe is attached to the contact surface with the drum. There is a device that brakes the drive shaft by attaching and detaching the brake band to the brake drum.

For such a braking device, for example,
- As shown in Publication No. 18788, one end of the brake band is fixed to the case housing the brake drum, and the other end is connected to one end of the operating stick rotatably supported, and the brake band is The operating rod is biased by a spring or the like so that the lever comes into close contact with the brake drum. Then, push the other end of the operating stick (hereinafter referred to as the working end) to rotate the operating stick against the bias and move the brake band.
Braking is released by separating the brake shoe from the brake drum.

In such a braking device, even if the brake shoe wears out and decreases, the biasing force causes the shoe to come into close contact with the brake drum, but this causes the connection position between the brake band and the operating stick to move, Along with this, the position of the working end also moves. Therefore, if the operating member is moved to push the operating end, if the operating end moves and hits the operating member as described above, the biasing force will no longer work, and the device will braking force will decrease. In order to prevent this, the operating member should be kept far away from the operating end in advance in consideration of the movement of the operating end as described above, but if this is done, the movement stroke of the operating member will have to be long. It will stop happening. Furthermore, as the brake shoe wears down, it becomes necessary to rotate the operating stick by a large amount from the disengaged position until it comes into close contact with the brake drum. That is, the time required for braking to be applied varies depending on the degree of wear of the shoe. Therefore, it has been difficult to obtain stable braking performance.

On the other hand, there is also a braking device as shown in Utility Model Application Publication No. 57-119680, which is shown in Figures 6 to 8.
This will be explained based on the diagram.

A mounting base 53 having a cross-section shape is screwed onto the bottom of an outer tank 52 in which a washing and dehydration tank 51 (hereinafter referred to as a dehydration tank) is installed. , hemispherical catch seat 55 of the hanging rod 54,
55 are integrally formed. Further, similar seats 56, 56 are integrally molded on the lower side wall of the outer tank 52 in a direction perpendicular to the line connecting the seats 55, 55, and the lower end surface of these seats 55, 56 and the hanging rod 54. A hemispherical body 57 and a compression spring 58 are interposed in the
The outer tank 52 is elastically suspended and supported within a machine frame (not shown) by a hanging rod 54. Flange portions 59, 59 are bent at both ends of the mounting base 53 in the non-longitudinal direction, and an upper bearing 61 that pivotally supports the drive shaft 60 of the dehydration tank 51 is provided at the center of the mounting base 53. A case 62 is integrally molded. Case 64 of the lower bearing 63 of the drive shaft 60
are screwed onto the flange portions 59, 59. The flange portions 59, 59 further include a motor 65, a drain valve 66, and a connecting rod 67 for connecting the drain valve 66.
A solenoid 68 that opens and closes via the screw is screwed onto the solenoid 68. Reference numeral 69 denotes a rotary blade, a blade shaft 70 of which passes through the inside of the drive shaft 60, a pulley 71 is fixed to the lower end, and this pulley 71 and a pulley 73 fixed to a motor shaft 72 are connected via a belt 74. There is. 75 is a clutch that controls the transmission of power to the drive shaft 60.

A brake drum 76 is fixed to the drive shaft 60, and a brake band 77 having a brake shoe attached to the inside is pressed against the outer periphery of the drum 76 by its own elasticity. One end of the brake band 77 is a bent piece bent outward. Reference numeral 78 denotes a brake lever, which is pivotally supported by a support shaft hanging from a lever mounting flange 79 bent on the lower bearing case 64, and the bent piece is fitted into one end of the lever 78 during braking. An angular through hole 80 into which the hole fits is formed, and the drain valve 6 is formed at the other end.
The brake drum 7 is engaged with a protrusion 81 provided on a connecting rod 67 that operates the brake drum
6 side, and the bent piece is fitted into the through hole 80. Then, during dehydration, the brake lever 78 is rotated via the connecting rod 67 by the excitation of the solenoid 68 against the bias of the spring 82, and the bent piece is removed from the through hole 80.

When the dewatering is finished, the excitation of the solenoid 68 is cut off, the drain valve 66 is closed, the brake lever 78 is rotated by the spring 82, and the bent piece at one end of the brake band 77 is inserted into the through hole 80.
It fits into the stopper 83 and applies a brake to the brake drum 76, that is, the drive shaft 60.

In such a braking device, even if the brake shoe is worn out due to repeated braking operations, the brake band 77 presses the brake shoe against the brake drum 76 by its own elasticity. The state of the brake band 77 does not change, and the interlocking state of each component for operating the device does not change. Therefore, the same braking operation can be performed at all times without being affected by wear of the brake shoe, and stable braking performance can be achieved.

However, when the brake lever 78 is engaged with the brake band 77, a large impact noise is generated, and this becomes the main noise source of the washing machine.

(c) Problems to be solved by the invention The present invention provides a braking device for a dehydrating washing machine that can provide stable braking performance and has low operating noise.

(d) Means for Solving the Problems The braking device of the dehydrating washing machine of the present invention comprises a brake drum fixed to the drive shaft of the washing/dehydrating tank, a brake band elastically crimped to the brake drum, and A brake shoe attached to a crimping surface of a brake band with the brake drum, a clutch boss to which the drive shaft is loosely fitted, and a brake clutch spring wound around the clutch boss and having one end fixed to a mounting base. , an operating member for operating the other end of the clutch spring in an expanding direction and a tightening direction, and a connecting member for connecting the brake band and the clutch boss.

(E) Effect: That is, while the dewatering tank is rotating, the brake drum, brake band, connecting member, and clutch boss rotate together with the drive shaft. By operating the brake clutch spring in the tightening direction, the clutch spring is tightened and the clutch boss is fixed, and accordingly, the connecting member and the brake band are fixed, and the brake drum and brake shoe, which are about to rotate, are fixed. A frictional force is generated between the two, and a braking force is applied to the drive shaft.

In addition, even if the brake shoe wears out, the brake band's own elasticity presses the brake shoe against the brake drum, so the condition of the brake band does not change and each component in the device There is no change in the state of association.

(F) Embodiments Examples of the present invention will be described based on the drawings.
However, the same reference numerals are given to the same parts as in the conventional example, and the description thereof will be omitted.

A brake drum 1 is fixed to the drive shaft 60 with a screw 2. At this time, grooves 4 are formed in the vertical direction on the inner surface of the screw hole 3 of the brake drum 1 as shown in FIG. 3A and 3B. That is, in order to ensure secure screwing, the screw 2 is tapered and the tip of the screw 2 is recessed into the surface of the drive shaft 70. Conventionally, the area around this recessed part is The brake drum 1 bulges out, and this bulge gets caught when removing the brake drum 1 during repair, making it impossible to perform the work. Therefore, by providing the groove 4, this catch is released.

A brake band 77 having a brake shoe 5 is elastically crimped around the brake drum 1 as in the conventional case.

6 is a cylindrical clutch boss that fits loosely on the drive shaft 60, 7 is a cross-sectional connecting member, and a hole 8 having the same diameter as the inner diameter of the clutch boss 6 is provided at the center of the upper surface.
Slits 9, 9 are formed on both sides, and the periphery of the hole 8 is depressed downward. And, Figure 4 A,
As shown in b, the clutch boss 6 is connected to the connecting member 7.
Weld to the periphery of hole 8. At this time, by forming an inwardly inclined surface 10 on the mouth edge of the clutch boss 6 as shown in FIG.
The press-fitting work of the oil-less metal 12 interposed between the 0 and 0 becomes easy.

Thus, the clutch boss 6 is attached to the drive shaft 60.
(connecting member 7) and the brake drum 1 from below, and bend the piece 1 at one end of the brake band 77.
3 into the slit 9 of the connecting member 7,
Fix the brake drum 1 with screws.

Next, 14 is a brake clutch spring wound (left-handed) around the clutch boss 6, its lower end 15 is fixed to the mounting base 53 with a pin 16, and its upper end 17 is fixed to the connecting rod 67. It is inserted into an upwardly directed concave groove 19 formed at one end of the operating lever 18 .

Reference numeral 20 denotes a clutch spring for preventing reverse rotation of the dehydration tank 51, which is wound around the brake drum 1 in the opposite direction (clockwise) to the clutch spring 14, and whose lower end 21 is wound around the case 64 of the lower bearing 63. Fixed.

Note that 22 is a clutch piece that engages and disengages from the clutch 75 in conjunction with the connecting rod 67, and when engaged, the transmission of power to the drive shaft 60 is released.

The operation will be explained based on this configuration. Note that some parts are omitted in FIG. 2 for convenience of explanation.

During dewatering, the solenoid 68 is energized, the connecting rod 67 is pulled in the direction of the arrow in FIG. 2, and the drain valve 66 is opened. At the same time, the clutch piece 2
2 is disengaged from the clutch 75, power is transmitted to the drive shaft 60, and the operating lever 18 operates the upper end 17 of the clutch spring 14 as shown by the dotted line in FIG. The dehydration tank 52) rotates to the left (counterclockwise in FIG. 2).

Next, when the dewatering is completed, the excitation of the solenoid 68 is cut off, and the drain valve 66 is closed. At the same time, the clutch piece 22 engages with the clutch 75, power transmission to the drive shaft 60 is cut off, and the operating lever 18 moves the upper end 17 of the clutch spring 14 in the tightening direction (in the solid line position in FIG. 2). ).

As the clutch boss 6 rotates, the clutch spring 14 tightens more strongly, thereby locking the clutch boss 6 from rotating. Therefore, the connecting member 7 is also in a fixed state, and since the connecting member 7 and the brake band 77 are in a locked state, this is also in a fixed state. In this way, a frictional force is generated between the brake shoe 5 and the rotating brake drum 1, and the drive shaft 60
The brake is applied to stop the dehydration tank 52.

Now, during washing, only the drive shaft 70 rotates, so the rotary blades 69 are reversed left and right. At this time, the dehydration tank 52 is
The clutch spring 14 also tries to rotate, but when it rotates to the left, the clutch spring 14 tightens.
The braking force as described above is activated to prevent rotation of the dehydration tank 52. Furthermore, when rotating in the clockwise direction, the clutch spring 14 does not act because the direction is in which the clutch spring 14 expands, but the clutch spring 20 wound around the brake drum 1 does not act.
As a result, the brake drum 1 is locked and rotation of the dewatering tank 52 is prevented.

As described above, this embodiment performs a very quiet braking operation. Moreover, the connecting member 7
Since the center of the upper surface protrudes toward the brake drum 1 side, the welded portion 11 with the clutch boss 6
The distance between the locking part (slit 9) of the brake band 77 becomes shorter, the pressure applied to the welded part 11 and the clutch boss 6 is alleviated, the durability is increased, and the degree of wear of the oil-less metal 12 is also reduced. Ru. Furthermore, since the distance between the welded part 11 and the wound part of the clutch spring 14 (FIG. 4, part a) is further away, it is difficult for the heat during welding to be transmitted to the wound part, and the hardness of the wound part is lower than this. Accidents such as drops due to heat can also be reduced.

(g) Effects of the invention According to the braking device for the dehydrating washing machine of the invention, even if the brake shoe is worn out, the brake band can press the brake shoe against the brake drum due to its own elasticity. The state of the device does not change, and the state of connection of each component within the device does not change. Therefore, since the same braking operation can be performed at all times, stable braking performance can be obtained.

In addition, since the brake band is fixed by tightening the brake clutch spring, the operating noise of the device can be reduced and the user will not feel uncomfortable.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main part of the braking device of the dehydrating washing machine according to the present invention, Fig. 2 is a bottom view of the same, Fig. 3 A is a cross-sectional view of the main part of the brake drum, and Fig. 3 B is another embodiment. 4A is a perspective view of the connecting member, FIG. 4B is a sectional view of the same side, and FIG.
Figures A and B are enlarged sectional views of the same essential parts, Fig. 6 is a sectional view of the essential parts of a conventional dehydrating washing machine, Fig. 7 is a perspective view of the same brake lever, and Fig. 8 is a bottom view of the same. DESCRIPTION OF SYMBOLS 1... Brake drum, 5... Brake shoe, 6... Clutch boss, 7... Connection member, 14
... Brake clutch spring, 18 ... Operation lever (operation member), 60 ... Drive shaft, 77 ...
...brake band.

Claims (1)

[Scope of utility model registration request] A brake drum fixed to the drive shaft of the washing/dehydration tank, a brake band elastically crimped to the brake drum, a brake shoe attached to the crimped surface of the brake band with the brake drum, and the drive shaft. a clutch boss into which is loosely fitted, a brake clutch spring that is wound around the clutch boss and has one end fixed to a mounting base, and an operating member that operates the other end of the clutch spring in an expanding direction and a tightening direction; A braking device for a dehydrating washing machine, comprising a connecting member connecting the brake band and the clutch boss.