JPS60131046A - Cooler of motor for washing machine - Google Patents

Abstract

PURPOSE:To sufficiently cool a motor which has many ON and OFF times by coupling a cooling fan through a one-way clutch to the rotational shaft of the motor. CONSTITUTION:A drive pulley and an insert 21 coupled integrally with the pulley are secured to a rotational shaft 11 by a screw 18 to rotate normally or reversely in accordance with the rotating direction of a motor 10. A cooling fan 14 is coupled with the insert 21 by a one-way clutch 23, and a rotary force of the shaft 11 is transmitted through the insert 21. The fan 14 and the insert 21 are coupled only when the motor 10 is rotated normally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a motor cooling device for a washing machine used in general households. FIG. 1 shows the general structure of a conventional washing machine. In the figure, l is a washing/dehydration tank, 2 is a stirring blade installed at the bottom, and 8
is a water tank. 4 is a board provided at the bottom of the water tank 3;
Motor 10 is fixed to substrate 4 via bracket 5. Reference numeral 11 denotes a rotating shaft of a motor 10, to which a cooling shaft 6 and a driving pulley 7 are attached.

Reference numeral 8 is a mechanical case that houses a reducer etc. that controls the rotation of the stirring blade 2, and has a driven pulley 9 that is connected to the drive pulley 7 by a bell (12), and the rotation of the motor 10 is transmitted to the driven pulley 9 by the drive pulley 7. be done.

By the way, the stirring blades of recent washing machines have become larger, and many of them shorten the reversal time to make the water flow more gradual.As a result, the on-time of the motor when reversing is shortened.
The number of revolutions is extremely low, from a few times to a few times.
On the other hand, the number of on/off cycles has increased. On the other hand, in the conventional structure, the cooling fan 6 is connected to the rotating shaft 1 of the motor.
Since it is fixed at 1, there is a cooling effect when the rotation is forward, but no cooling is performed when the rotation is reverse. Therefore, when the motor is turned on for a short time and the number of on/off cycles is large during reversal, the cooling fan 6 will rotate in the normal direction for a short period of time, and the number of rotation changes in the forward and reverse directions will increase. In such a state, the motor is not cooled sufficiently, causing accidents such as burnout of the motor and seizure of the metal.

The present invention is intended to solve this problem, and an object of the present invention is to provide a motor cooling device that has a short on time and can sufficiently cool a washing machine motor that is turned on and off many times. It is something to do.

[Configuration of the Invention] The washing machine motor cooling device of the present invention has the following features:
A cooling fan loosely inserted into the rotating shaft of the motor, a drive pulley having a dish-shaped recess and fixed to the rotating shaft of the motor, and an insert press-fitted into the dish-shaped recess and integrally coupled with the drive pulley. The insert and the cooling fan are coupled to each other by a clutch that transmits rotation of the rotating shaft only in one direction.

An embodiment of the present invention will be described with reference to an assembled view in FIG. 2 and an exploded view in FIG. 8. 13 is a stop ring fitted into the base of the rotating shaft 11 of the motor 10. 4 is a cooling fan and has a cylindrical bearing portion 15 that is loosely inserted into the rotating shaft 11. 16 is a dish-shaped drive pulley with a rotating shaft, 11 is a screw 18
It has a cylindrical bearing part 17 which is rotated by.

Reference numeral 20 denotes an insert that is press-fitted into the dish-shaped recess 19 of the drive pulley 16 and is integrally connected to the cylindrical bearing portion 21.
has. 28 is a one-way clutch made of a spring or the like that connects the bearing part 15 of the cooling fan and the bearing part 21 of the insert, and its pawl 24 is connected to the groove 2 provided in the insert 21.
Lock at 2.

Next, its effect will be explained. The drive pulley 19 and the insert 21 integrally connected thereto are fixed to the rotating shaft 11 by the screw 18, so that they rotate in forward and reverse directions according to the rotational direction of the motor 10. The cooling fan 14 is connected to the inserter 21 by a one-way clutch 28, and the rotational force of the rotating shaft 11 is transmitted through the insert 21, so the cooling fan 14 is activated only when the clutch 23 is rotated in the forward direction.
If you set it to combine and insert 21,
The cooling fan 14 is connected to the clutch 23 when the motor 10 is reversed.
The direction of rotation becomes free. Note that the direction of rotation during dehydration, in which the motor 10 is on for a long time, is defined as forward rotation.

[Effects of the Invention] As described above, in the present invention, the cooling fan 14 is configured so that the rotational force is transmitted through the one-way clutch 28 without being directly fixed to the rotating shaft 11 of the motor lo. Therefore, it is driven only when the motor rotates in the forward direction, and the direction of rotation can be freely controlled when the motor rotates in the reverse direction. Therefore, when the motor repeats on-on during reverse rotation, it is driven when the forward rotation is on, and when it is off, it continues to rotate due to inertia, and even when the motor turns on the reverse rotation, the brake is not applied. Conventional cooling fans were directly fixed to the rotating shaft of the motor, which could result in insufficient cooling of the motor in washing machines that frequently rotated, but the device of the present invention solves this problem and improves the efficiency of washing machines. It has an excellent effect on improving safety.

[Brief explanation of the drawing]

Fig. 1: A diagram showing a washing machine equipped with a conventional cooling device. Fig. 2: A diagram showing an embodiment of the cooling device of the present invention. Fig. 8: An exploded view of the cooling device of Fig. 2. 10...Motor, DESCRIPTION OF SYMBOLS 11... Rotating shaft, 12... Belt, 18... Stop ring, ■4... Cooling fan, 15... Bearing part, 16... Drive pulley, 17...
...Bearing part, 18...Screw, 19...Dish-shaped recess, 2
011. Insert, 21...Bearing part, 22...Groove, 28...One-way clutch, 24...Claw Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A cooling fan loosely inserted into the rotating shaft of the motor, a drive pulley having a dish-shaped recess and fixed to the rotating shaft of the motor, and an insert press-fitted into the dish-shaped recess and integrally coupled with the drive pulley. A cooling device for a washing machine motor, wherein the insert and the cooling fan are connected by a clutch that transmits rotation of a rotating shaft only in one direction.