JPH0246863Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brake drum for a dehydrator in a washing machine.

[Conventional technology]

In a two-tub type washing machine, as shown in Fig. 3, a dewatering basket 2 is arranged in a dehydrating tank 1, and a dehydrating motor 3 is provided below the dehydrating tank 1, and the rotating shaft 4 of the dehydrating basket 2 and the dehydrating motor are connected to each other. 3 is connected to the motor shaft 5 by a joint 6.

Further, a wire 8 with a brake shoe 7 attached to its tip is connected to a dehydration lid 9, so that the brake shoe 7 faces the joint 6.

This joint 6 also serves as the brake drum of the dewatering basket 2, and a metal cylindrical body 21 is fitted onto the brake drum body 20 made of synthetic resin to obtain sufficient frictional force and to make it replaceable. However, conventionally, as shown in FIG. 4, the brake drum main body 20 has a cylindrical part 20a into which the rotating shaft 4 and the motor shaft 5 are inserted, protruding from the upper surface part 20b, and the upper surface part 20b has a cylindrical part 20a extending from the center. Elongated insertion holes 22 are bored in parallel to the left and right at the front, rear, left and right positions, and downward bent protrusions 23 are formed in the cylindrical body 21 at positions that match the elongated insertion holes 22.

In this way, the bent protrusion 23 is inserted into the elongated insertion hole 22 of the brake drum body 20, the tip of the protrusion 23 is further bent, and the cylindrical body 21 is fixed to the brake drum body 20, and the cylindrical body 21 is fixed to the cylindrical body part 20a of the brake drum body 20. The rotating shaft 4 and motor shaft 5 of the dehydrating basket 2 are inserted from the upper and lower open ends, respectively, to connect the dehydrating basket 2 and the dehydrating motor 3.

When the dewatering motor 3 is energized under operation control by a timer, its rotation is transmitted to the rotary shaft 4 via the motor shaft 5 and the brake drum body 20, and the dehydrating basket 2 is rotated.

To stop the rotation of the dehydration basket during two rotations, open the dehydration lid 9, and the wire 8 will open in conjunction with this.
As a result, the brake shoe 7 comes into pressure contact with the circumferential surface of the cylindrical body 21, and the frictional force applies braking to the rotation of the cylindrical body 21 and the brake drum body 20 integrated therewith, thereby ensuring safety.

[Problem that the invention attempts to solve]

However, in the structure of the cylindrical body 21 combined with the conventional brake drum body 20, when braking is applied to these rotations, a braking force F is applied to the circumferential surface of the cylindrical body 21 in the tangential direction, but the protrusion 23 is a point to be inserted into the insertion hole 22, and a brake force F ₁ is applied to one end slightly outwardly from the brake force F.
acts, and a braking force _F2 acts on the other end further outward than the braking force _F1 , and the relationship between the magnitudes of these forces F, _F1 , and _F2 is _F1 >
F ₂ >F, and both direction and magnitude are different.

Therefore, in addition to shearing force, torsional force acts on the protruding piece 23, and as a result, the protruding piece 23 is easily damaged.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
An object of the present invention is to provide a brake drum for a washing machine that can prevent damage to protruding pieces of a cylindrical body and improve durability.

[Means for solving problems]

In order to achieve the above object, the present invention covers the brake drum body with a metal cylinder by inserting a bent protrusion formed on a metal cylinder into an elongated insertion hole bored on the upper surface of the brake drum body of a dehydrator. When fitting, the elongated insertion hole is appropriately bored radially in the same direction as the tangential direction of the brake drum body, and a bent protrusion is formed on the metal cylinder body toward the center so as to match the elongated insertion hole. The bent protrusion is then engaged with the elongated insertion hole.

[Effect]

According to the present invention, a braking force acting in the same direction as the braking force acting on the outer periphery of the cylindrical body is applied to both ends of the protruding piece, so only shearing force is generated on the protruding piece, no torsion force is applied, and the protruding piece is damaged. Never.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a plan view of the brake drum of the present invention, and Fig. 2 is a vertical sectional front view of the same.The overall structure of the washing machine to which the brake drum of the present invention is attached is the same as that explained in Fig. 3, so the details are as follows. Further explanation will be omitted.

The joint 6 is composed of a brake drum body 10 and a cylindrical body 11 fitted thereto, and the rotation axis of the dehydration basket 2 is located at the center of the upper surface 10b of the brake drum body 10, which is integrally molded of synthetic resin or the like. 4 and the motor shaft 5 of the dehydration motor 3 are inserted into the cylindrical body part 10a, which is similar to the conventional example. A suitable number (four in the illustrated example) are arranged radially and at equal intervals from the center of the main body 10 so as to surround the main body 10a, and the longitudinal direction of the elongated holes 12 is parallel to the brake drum main body 1.
Position it so that it is always parallel to the tangential direction of 0.
Note that 10c in the figure is a partition plate that partitions the insertion holes 13 and 14 of the rotating shaft 4 and the motor shaft 5, respectively.

Further, the cylindrical body 11 serves as a friction surface with the brake shoe 7 and is formed of metal.
A downwardly bent projecting piece 15 is formed at a position that matches the elongated hole 12 when fitted.

In this way, the protruding piece 15 of the cylindrical body 11 is inserted into the elongated hole 12 bored in the upper surface portion 10b of the brake drum main body 10, and the tip of the protruding piece 15 is further bent outward, and the brake drum main body 10 is
The cylindrical body 11 is fitted onto the cylindrical body 11.

Then, the cylindrical body portion 10 of the brake drum body 10
The rotating shaft 4 of the dehydrating basket 2 and the motor shaft 5 of the dehydrating motor 3 are inserted into the insertion holes 13 and 14 of a, respectively, until they abut against the partition plate 10c, thereby connecting the dehydrating motor 3 and the dehydrating basket 2.

Next, to explain the usage and operation, when the dehydration motor 3 is energized, the motor shaft 5 rotates.
The rotation is transmitted to the rotating shaft 4 of the dewatering basket 2 via the brake drum body 10, the dehydrating basket 2 rotates, and dewatering work is performed.

By the way, in order to stop the rotation of the dehydrating basket while it is rotating twice, the dehydrating lid 9 is opened, and the brake shoe 7 is pressed against the circumferential surface of the cylindrical body 11 by the action of the wire 8, and the cylinder is rotated due to the frictional force. Braking is applied to the rotation of the brake drum body 10 which rotates integrally with the body 11 and the protruding piece 15.

At this time, a braking force F is applied to the circumferential surface of the cylindrical body 11 in the tangential direction due to the pressure contact of the brake shoe 7, and as a result, a braking force F ₃ is also applied to the protruding piece 15.
acts to apply braking to the brake drum body 10, but the braking force _F3 acting on both ends of the insertion point of the projection piece 15 is in the same direction as the braking force F since the longitudinal direction of the elongated hole 12 is parallel to the tangential direction. The direction is tangential, and no torsional force acts on the protruding piece 15 portion.

The braking force F due to the friction thus applied to the circumferential surface of the cylindrical body 11 is transmitted to the brake drum body 10 via the protrusion 15, and further transmitted from the rotary shaft 4 to the dewatering basket 2 to stop its rotation.

[Effect of idea]

As described above, in the brake drum of the present invention, a cylindrical body is fitted onto the brake drum body that connects the rotating shafts of the dehydration basket and the dehydration motor, and a brake shoe is pressed against the circumferential surface of this cylindrical body to generate friction. When applying braking, no torsional force is applied to the protruding part of the cylindrical body that transmits the braking force to the brake drum body, which prevents the protruding part from being damaged and improves durability. Also,
Since the brake drum can be made thinner, materials can be saved and manufacturing becomes easier.

Furthermore, braking efficiency is improved because the braking force applied to the cylindrical body is smoothly transmitted to the drum body.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the brake drum of a washing machine of the present invention, Fig. 2 is a longitudinal sectional front view of the same, Fig. 3 is a longitudinal sectional side view showing the general structure of a two-tub washing machine, and Fig. 4. 5 is an exploded perspective view showing a conventional example of a brake drum, and FIG. 5 is a plan view of the same. 1... Dehydration tank, 2... Dehydration basket, 3...
Dehydration motor, 4...rotating shaft, 5...motor shaft, 6...coupling, 7...brake shoe, 8...
Wire, 9... Dehydration lid, 10... Brake drum body, 10a... Cylindrical body part, 10b... Main body top part, 10c... Partition plate, 11... Metal cylindrical body, 1
2... Elongated hole, 13, 14... Insertion hole, 15...
Projection piece, 20... Brake drum body, 20a...
Cylindrical body part, 20b...Top surface part, 21...Cylindrical body, 2
2...Elongated insertion hole, 23...Protrusion piece.

Claims (1)

[Scope of utility model registration request] When fitting the metal cylindrical body onto the brake drum body by inserting the bent protrusion formed on the metal cylindrical body into the elongated insertion hole drilled on the upper surface of the brake drum body of the dehydrator, the elongated insertion hole is A radial hole is formed in the same direction as the tangential direction of the brake drum main body, and a bent protrusion is formed on the metal cylinder body toward the center so as to match the elongated insertion hole. A brake drum for a washing machine, characterized in that the brake drum is engaged with an elongated insertion hole.