JPS6317430Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a power transmission device for a washing machine or the like used in a general household.

Conventional configuration and its problems FIG. 1 shows a conventional power transmission device.

In the figure, a pulsator rotatably supported by a bearing 3 is mounted on the bottom of a washing tub 2 housed in an outer box 1 of a washing machine, and is decelerated by a motor pulley 6, a belt 7, and an impeller pulley 8 attached to a drive motor 5. It is common to drive. However, with this configuration, if the reduction ratio is increased to reduce the torque of the drive motor and to improve the cleaning performance, the contact angle of the motor pulley 6 with the belt 7 becomes smaller due to the large reduction ratio, resulting in slipping. Therefore, sufficient power was not transmitted, and a sufficient reduction ratio could not be obtained by one-stage reduction of the motor pulley 6 and impeller pulley 8.

Purpose of the invention The purpose of the present invention is to eliminate such conventional drawbacks, to achieve stable power transmission even at a large reduction ratio, to reduce costs and improve performance.

Structure of the invention The present invention includes a motor pulley attached to the shaft of a drive motor to engage a belt, and a fixture rotatably supported on the shaft of the drive motor, one leg being short and the other long. An inverted U-shaped elastic body is provided, a short leg of the elastic body is rotatably supported on the fixture, and a roller rotatably supported by the elastic body is brought into contact with the belt. shall be.

DESCRIPTION OF EMBODIMENTS An embodiment of a power transmission device (hereinafter simply referred to as a device) for a washing machine or the like according to the present invention will be described based on the accompanying drawings.

FIG. 2 is an enlarged vertical cross-sectional view of the main parts of the device of the present invention, and FIGS. 3 and 4 are plan views of the main parts when the drive motor rotates in the A direction and the B direction.

In the figure, the same reference numerals as in FIG. 1 indicate the same parts and parts.

The motor pulley 6 is attached to the shaft 5a of the drive motor 5 with bolts 9 and nuts 10, and is attached to a mounting tool 11.
is rotatably supported on the shaft 5a by a retaining ring 12. 13 is an elastic body, one end of which is attached to the fixture 11, and a roller 14 that rotates in contact with the belt 7 is attached to the other end by a protrusion 15 and a washer 16.

3 shows the position of the roller 14 when the drive motor 5 rotates in the A direction, and FIG. 4 shows the position of the roller 14 when the drive motor 5 rotates in the B direction.

The operation of the device of the present invention will be explained.

Power is supplied to the drive motor 5, and the drive motor 5
When the belt 7 rotates in the direction A, tension is generated on the retracting side 7a of the belt 7 that engages with the motor pulley 6 attached to the shaft 5a of the drive motor 5, and the opposite side 7b tends to be loosened, but the roller that comes into contact with the belt 7 14 rotates to the X position together with the fixture 11, and the elastic body 13 suppresses outward displacement due to loosening of the belt 7, thereby preventing a reduction in the contact angle.
Similarly, when the drive motor 5 rotates in the B direction as shown in FIG. 4, it is possible to prevent the contact angle from decreasing at the Y position.

Note that the X and Y positions are positions where the outward force of the belt 7 and the drag force of the elastic body 13 are balanced, and by increasing the elastic force of the elastic body 13, the contact angle is larger than the theoretical contact angle when the roller 14 is not installed. You can get the horn.

Effects of the invention As is clear from the examples of the invention, even if the reduction ratio is increased, the contact angle can be prevented from decreasing due to the outward direction of the slack side of the belt, and the contact angle can be further increased. By increasing the reduction ratio, the torque of the drive motor can be reduced, thereby reducing costs, and by rotating the pulsator at a low speed, it is possible to achieve a uniform cleaning effect and reduce damage to the fabric, etc. produces the effect of

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the overall structure of a conventional power transmission device for a washing machine, Fig. 2 is an enlarged sectional view of the main parts of the device of the present invention, and Figs. 3 and 4 show the operation of Fig. 2. A plan view is shown. 5: Motor, 5a: Motor shaft, 6: Motor pulley, 7: Belt, 11: Mounting tool, 12: Retaining ring,
13: Elastic body, 14: Roller, 15: Projection, 1
6: Washer.

Claims (1)

[Scope of utility model registration request] A motor pulley is attached to the shaft of the drive motor, and a belt is engaged with the shaft, a fixture is rotatably supported on the shaft of the drive motor, and an inverted U-shaped elastic body consisting of a short leg on one side and a long leg on the other side is provided. A power transmission device for a washing machine or the like, wherein a short leg of the elastic body is rotatably supported on the fixture, and a roller rotatably supported by the elastic body is brought into contact with the belt.