JPH02102696A - washing machine speed reducer - Google Patents

Abstract

PURPOSE:To constitute large reduction gear ratio with compact reduction structure by forming the other diameter of a first planetary gear smaller than the outer diameter of a second planetary gear and forming a first housing part to house the first planetary gear in a casing and a second housing part having a diameter, which is larger than that of the first housing part, in an upper part. CONSTITUTION:A sun gear 22 of a first decelerating device is fixed to an output shaft 14 of a motor 3 and first planet gears 23 engaged with the gear 22 are arranged in the inner peripheral side of a first internal gear 24. A shaft supporter 27 to fix the upper side of a rotary shaft 25 goes to be a sun gear 42 of a second planetary gear reduction gearing, samely as a first planetary reduction gearing, a rotary shaft 29 of a second planetary gear 28 is held by shaft supporters 30 and 31 from upper and lower directions. The first planetary reduction internal gear 24 is formed smaller than the diameter of the second internal gear 29 and when the gear 24 is integrated into a casing 34, it is easy to insert the gear. Then, the gear module of the first planetary reduction gearing is in the side of the motor 3. Since the transmission force of a torque is smaller than that of the second planet decelerating part, the device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deceleration device for a washer that decelerates and transmits the rotation of an electric motor to rotary blades that agitate clothes.

Conventional technology FIG. 4 shows the groove configuration of a conventional speed reduction device for a washing machine.

That is, the rotary blades 2 are rotatably arranged at the inner bottom of the washing tub 1. In addition, the rotational force of the electric motor 3 is decelerated by a belt 6 between the pulley 4 and the impeller pulley 5, and the rotation of the impeller pulley 5 is further decelerated by an internal gear 8 such as a sun gear, and the output shaft 9 of the internal gear 8 is rotor blade 2
It is equipped with a deceleration device that connects and transmits data. There is a system in which the rotor blade 2 is directly driven by only the deceleration of the belt 6 between the pulley 4 and the impeller pulley 5 shown in the figure, but the pulley 4. In the reduction of the belt 6 using only the impeller pulley 6, there is a limit to the reduction ratio, and most of the reduction is due to the slip of the belt 6. Considering the output of the motive 3, it is a standard reduction. In the method of washing by rotating the rotary blade 2 at low speed,
In addition to the deceleration of the belt 6, a gear reduction section consisting of a sun gear 7 and an internal gear 8 is provided to achieve higher deceleration.

Problems to be Solved by the Invention However, such a configuration requires a gear reduction part and its outer box 11, and also needs to be stored in a narrow space between the bottom of the washing tub 1 and the underframe part 13 at the bottom of the main body 12. Yes, it was not suitable for smaller washing machines. Naturally, this also increases the cost.

Furthermore, in the method of decelerating the belt 6, the shaft 14 of the electric motor 3
．． The force of the belt 6 is applied in a direction perpendicular to the axis 1o of the impeller pulley 6, and the force tends to cause displacement between both axes.
Particularly in the recent large-capacity washing machines, torque transmission loss tends to occur, and in order to prevent this, bolts 15 are used to attach the electric motor 3 to the underframe 13. It was necessary to strengthen the vibration isolating rubber 16 and mechanically suppress the lateral displacement of the washing tub 1, but as a result, the vibrations of the electric motor 3 and other components were easily transmitted to the washing machine body, resulting in a high-pitched noise. there were. Further, the tension of the belt 6 exerts a large force on the shaft of the rotor 2 and the boss portion 17 to which the outer case 11 is attached, causing deformation.

Therefore, the first object of the present invention is to provide a high-efficiency reduction gear that does not use a belt reduction device and has a 111-inch structure that can be integrated with an electric motor by configuring a large reduction ratio (deceleration ratio) with a small reduction structure. The purpose is

A second purpose is to reduce the sound of meshing teeth generated from the speed reducer to reduce noise.

Means for Solving the Problems and In order to achieve the above-mentioned first objective, the first technical means of the present invention is a first system that inputs rotation from an output shaft of an electric motor.
a planetary gear, a sun gear of a second planetary gear into which the output of the first planetary gear is input, and a casing that houses the first planetary gear and the second planetary gear; The outer diameter of the gear is smaller than the outer diameter of the second planetary gear, and the casing has a first storage part for storing the first planetary gear, and a first storage part with a diameter larger than the first storage part on the upper part. This is a configuration in which a second storage section is formed.

In addition, in order to achieve the second object, the second technical means of the present invention is that each of the two planetary gears is a helical gear, and the helix angles of the teeth are in opposite directions. l? It is complete.

Effects According to the first technical means described above, it is possible to attach a reduction gear with a large reduction ratio on the electric motor, so by attaching the electric motor under the axis of the rotor blade, there is no frictional conduction from belts, etc., and slips etc. It is possible to provide a speed reduction device that does not cause this phenomenon. Therefore, efficient output is obtained, and there is no radial force on the shaft other than the thrust force at the top and center of the shaft, which solves the problem of strength at the bottom of the washing tub. The vibration structure also suppresses vibration transmission to the 9-frame frame with a light holding force, and can also reduce radial vibration.

In addition, the high speed and low torque from the output shaft of the electric motor is received by the first planetary gear with a small diameter, and the low speed and high torque from this first planetary gear is received by the second planetary gear with a large diameter. It can withstand sufficient strength. Furthermore, in assembling the speed reducer, the first and second planetary gears may be attached to the casing in this order, thereby improving the ease of assembly.

′! ! According to the second technical means, the first and second planetary gears are helical gears to increase the meshing ratio of the teeth of the gears to reduce noise. By arranging the tooth traces of the planetary gears in opposite directions, the forces in the strut direction caused by the rotation of the helical gear can be canceled out and the movement in the strut direction can be suppressed.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2.

As shown in the figure, a shaft 19 is connected to the rotating shaft of a large rotary blade placed at the bottom of the washing tub, and this shaft 19 is inserted into a bearing fixed to the bottom of the washing tub with a nut. An electric motor 3 is fixed to the underframe at the bottom of the main body with bolts via anti-vibration rubber, and the axes of the electric motor 3 and the rotary blade 2 are the same. The sun gear 22 of the first reduction gear is fixed to the output shaft 14 of the electric motor 3, and several first planetary gears 23 meshing with it are fixed to the output shaft 14 of the electric motor 3.
It is arranged on the inner peripheral side of the internal gear 24.

26 is a rotating shaft of the planetary gear 23, and 28 is a shaft supporter thereof, which fixes the rotating shaft 26 from the lower part. Similarly, a shaft supporter 27 that fixes the upper side of the rotating shaft 26 serves as a sun gear 42 of a second planetary gear reduction device, 28 is a second planetary gear, and 29 is a second internal gear. Similar to the first planetary reduction gear, the rotation shaft 29 of the second planetary gear 28
It has shaft supports 30 and 31 that hold it from above and below, and an output shaft 32 is locked to the upper shaft supporter 31. 3
3 is a metal rotary bearing for the output shaft 320. The first internal gear 24 and the second internal gear 29 are housed in the casing 34. This casing 34 is fixed to the electric motor 3. Further, an oil seal 36 for preventing oil leakage is installed between the casing 34 and the output shaft 14 of the electric motor 3 in order to seal oil etc. into the casing 34 and ensure smooth rotation.
4 has a lid 36 on the top. Output shaft 3 of the above reduction gear
2 may be integrated with the rotating shaft 19 of the rotary blade 2.

In this embodiment, couplings 40 are provided between both shafts,
It is fixed to both shafts 19 and 32 with nuts 37, and a locking rubber 38 is interposed between both couplings 40 to transmit rotation. In this configuration, the first planetary reduction internal gear 24 is configured to have a smaller diameter than the second internal gear 29, which makes it easier to insert the gear upward when it is assembled into the casing 34. In addition, since the gear module of the first planetary reduction device is on the motor 3 side and the torque transmission force is smaller than that of the second planetary reduction device, it can be made smaller. The planetary reduction section has already been reduced by the first planetary reduction, and the torque amount increases by the proportion of the speed reduction in the continuous section, making the gear module larger.

Next, another embodiment of the present invention is shown in FIG. That is,
The first planetary gear 23 and the second planetary gear 28 have helical teeth, and the tooth lines are arranged in opposite directions.

In the above configuration, when the electric motor 3 rotates clockwise as indicated by the arrow, the first
The second planetary gear 23 has an upward thrust, but the second planetary gear 28 has a downward thrust, canceling each other out. By making the gear tooth profile helical, the meshing ratio of the gears is higher than that of spur gears, and continuous meshing can be achieved, resulting in a low-noise reduction mechanism. It is possible to arrange a speed reduction device having a ratio, eliminates the need for speed reduction using a belt or an impeller pulley, and also eliminates the need for belt tension management such as belt speed reduction.

In this embodiment, each of the internal gears 24 and 29 is constructed separately from the casing 34, but it is also possible to integrate them, but especially when forming a helical gear, they may be constructed separately. It is advantageous in terms of manufacturing and assembly. In the figure, numeral 39 is a retaining ring for preventing the output shaft from being pulled out, and numeral 41 is a serration eye for connection between the output shaft 32 and the shaft supporter 31.

Effects of the Invention As is clear from the above embodiments, according to the present invention, by providing a reduction gear with a large reduction ratio on the electric motor, it can be directly connected to the lower part of the rotor blade, eliminating the need for belt reduction, etc., and reducing rotation due to slip etc. There is no loss or slip due to variations in the distance between the two pulleys of the bell 1-, and a constant rotational force can be transmitted, and there is no deformation of the washing tub due to tension from a belt, etc., and it can provide cleaning performance. .

Furthermore, the diameters of the first and second planetary gears are made smaller on the motor output shaft side to improve strength. In addition, as a helical gear, we have achieved low noise, and the movement in the strut direction due to the use of a helical gear has been eliminated by making the tooth traces of the first and second planetary gears in opposite directions. , which enables stable power transmission with low sudden noise.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a planetary gear reduction device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is an exploded perspective view of a planetary gear reduction device according to another embodiment of the invention. FIG. 4 is a sectional view of a main part of a conventional washing machine.

Claims (2)

[Claims] (1) A first planetary gear that inputs rotation from the output shaft of the electric motor, a sun gear of a second planetary gear that inputs the output of the first planetary gear, and the first planetary gear and the second planetary gear. and a casing for storing a gear, the outer diameter of the first planetary gear being smaller than the outer diameter of the second planetary gear,
The casing includes a first planetary gear that accommodates the first planetary gear.
A speed reduction device for a washing machine, comprising a storage section and a second storage section having a larger diameter than the first storage section above the storage section. (2) The first planetary gear and the second planetary gear are both helical gears, and the gear tooth traces of the first and second planetary gears are formed in opposite directions. Washing machine speed reducer.