JP4296658B2 - Washing machine drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a washing machine drive device including a gear case that incorporates a speed reduction mechanism that reduces the rotational speed of a motor.
[0002]
[Prior art]
Conventionally, a washing machine equipped with this type of driving device has been configured as shown in FIGS. Hereinafter, the configuration will be described.
[0003]
As shown in FIG. 4, the washing machine main body 1 is provided with a water receiving tub 3 suspended by a suspension 2 so as to prevent dehydration vibration, and the washing / dehydrating tub 4 is rotated in the water receiving tub 3. An agitating blade 5 for agitating the laundry is rotatably disposed at the inner bottom of the washing / dehydrating tub 4.
[0004]
As shown in FIG. 5, the washing and dewatering tub 4 is provided at the upper end of the dewatering shaft 7 so as to be on the same axis as the dewatering shaft 7 supported by the bearing 6 provided at the bottom of the water receiving tub 3. The stirring blade 5 is fixed to the upper end portion of the washing shaft 9 that is disposed in the hollow portion of the dewatering shaft 7 so as to be coaxial with the dewatering shaft 7 and is supported by the bearing 8 provided in the hollow portion of the dewatering shaft 7. It is fixed. The lower end of the washing shaft 9 is connected to the output side of the speed reduction mechanism 10.
[0005]
The motor bracket 11 is formed in a cup shape and is attached to a gear case 12 including the speed reduction mechanism 10 with an opening facing downward, and a stator 14 that applies a rotating magnetic field to the rotor 13 is press-fitted into the motor bracket 11. A motor 15 is configured with the rotor 13 opposed to the motor 14, and the speed reduction mechanism 10 and the motor 15 are disposed on the same axis.
[0006]
The rotor 13 is configured by disposing a magnet 17 on a bottomed cylindrical rotor member 16, and a fitting hole 18 is provided in the center of the bottom of the rotor member 16. The mechanism input shaft 19 is fitted.
[0007]
The clutch mechanism 20 switches the rotation of the motor 15 to either the dewatering shaft 7 or the washing shaft 9. The clutch mechanism 20 is provided with a spring clutch 20 a in a space provided inside the rotor 13 and a clutch drive that drives the spring clutch 20 a outside. Means 20b is provided.
[0008]
The operation in the above configuration will be described. In the washing and rinsing stroke, the clutch driving means 20b of the clutch mechanism 20 releases the spring clutch 20a so that the rotational force cannot be transmitted to the dewatering shaft 7. The power of the motor 15 is only transmitted to the stirring blade 5 via the washing shaft 9, and gives mechanical force to the laundry in the washing and dewatering tub 4. In this way, washing and rinsing of the laundry stored in the washing / dehydrating tank 4 proceeds.
[0009]
When the washing process is finished, the dehydration process is started. In this dehydration process, the water in the washing / dehydration tub 4 is drained, and the clutch driving means 20b of the clutch mechanism 20 drives the spring clutch 20a, thereby applying a rotational force to the dehydrating shaft 7. It is assumed that it can be transmitted. As for the power of the motor 15, the speed reduction mechanism input shaft 19 and the dewatering shaft 7 are connected, and the washing and dewatering tub 4 rotates.
[0010]
As the washing and dewatering tub 4 rotates, the moisture of the laundry that has finished washing and rinsing is squeezed into the water receiving tub 3 from the holes provided on the side surface of the washing and dewatering tub 4 by centrifugal force. Thus, the laundry is automatically dehydrated. In this way, the laundry put into the washing / dehydrating tub 4 automatically finishes the washing, rinsing and dehydrating steps.
[0011]
[Problems to be solved by the invention]
In such a conventional configuration, when the rotation of the motor 15 is applied to the washing shaft 9 via the speed reduction mechanism input shaft 19 and the speed reduction mechanism 10, the insulation of the coil of the motor 15 and the speed reduction mechanism input shaft 19 is not sufficient. Had a safety problem.
[0012]
Further, as a solution, in order to insulate the contact surface between the motor bracket 11 and the gear case 12, the contact surface between the motor bracket 11 and the gear case 12 is formed by a resin mold. However, this configuration has a problem in that when water is applied to the coil, the insulation is deteriorated and the safety is lowered.
[0013]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and has an object to ensure insulation between a coil and a rotating shaft, prevent deterioration of insulation due to water intrusion, and firmly attach a motor.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention incorporates a speed reduction mechanism input shaft and a dehydrating shaft provided on the same axis inside, and reduces the speed of the speed reduction mechanism input shaft and transmits the speed reduction to the stirring blade. A gear case with a built-in motor is installed in the lower part of the washing and dehydrating tub, a shell molded with a resin mold, a rotor arranged with a magnet facing the stator inside the shell, a spring clutch and a spring clutch. A clutch drive means for driving to release, and a clutch mechanism for switching the rotation of the rotor to only one of the speed reduction mechanism input shaft and the dehydration shaft and the speed reduction mechanism input shaft. , configured to be positioned on the same axis, the shell is formed into a cup shape, they rely have been bottom molding the opening with resin down to the bottom of the formic Yakesu Via a ring or horseshoe shape of the sheet metal member from the opening portion side attached to the bottom surface of the gear case at a plurality of screws Rutotomoni, rotor is formed a bottom bottomed cylindrical shape with a bottom, the bottom center deceleration mechanism input It is configured to be rotatable with respect to the outer shell by being attached to the lower end of the shaft using a screw, the spring clutch is located in a space provided inside the rotor, and the clutch driving means is located outside the outer shell. It is configured.
[0015]
Thereby, insulation of a coil and a rotating shaft can be ensured, the deterioration of the insulation property by the penetration | invasion of water can be prevented, a motor can be attached firmly, and the height of a height direction can be made low.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention incorporates a reduction mechanism input shaft and a dehydration shaft provided in the lower part of the washing tub / dehydration tub and on the same axis, and rotation of the reduction mechanism input shaft. A gear case with a built-in speed reduction mechanism that reduces the number and transmits it to the stirring blades, an outer case in which a stator is molded with resin, and a rotor that is provided inside the outer case and that is provided with a magnet facing the stator. , and a clutch mechanism for switching the rotation of the rotor consists of a clutch driving means for releasing the drive spring clutch the spring clutch to one of said speed reduction mechanism input shaft and the dewatering shaft said reduction mechanism input shaft only, the rotor The rotation shaft, the speed reduction mechanism input shaft and the dehydrating shaft are configured to be located on the same axis, and the outer shell is formed in a cup shape, and the opening portion Attached a bottom which is molded with resin to below the bottom surface of the gear case at a plurality of screws through the ring or horseshoe sheet metal member from the opening side against the bottom surface of the gear case Rutotomoni, said rotor The bottom is formed in a bottomed cylindrical shape, and the center of the bottom is attached to the lower end of the input shaft of the speed reduction mechanism using a screw so that it can rotate with respect to the outer shell, and the spring clutch The clutch driving means is located in a space provided inside the rotor, and is configured to be located outside the outer shell, so that insulation between the coil and the rotating shaft can be secured, and insulation due to water intrusion It is possible to prevent the deterioration of the steel plate, improve safety, and when attaching the motor to the gear case, a ring or horseshoe-shaped sheet metal member is formed on the outer shell made of resin. By attaching and tightening the screw, the outer shell can be prevented from cracking with the force of tightening the screw, the motor can be firmly mounted, and the height in the height direction should be lowered Can do.
[0017]
According to a second aspect of the present invention, in the first aspect of the present invention, a rotational speed detection device that detects the rotational speed of the rotor is attached to an upper portion of the outer shell, and at least a detection unit of the rotational speed detection device is installed in the outer shell. It is arranged facing the inner peripheral surface of the rotor, and by arranging at least the detection part of the rotation speed detection device within the outer shell of the motor, it is possible to secure an insulation distance from the gear case, and safety Can be secured.
[0018]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0019]
Example 1
As shown in FIG. 1, the outer shell 21 is formed in a cup shape by molding a stator 22 with resin, and a rotor 24 is opposed to the stator 22 to constitute a motor 24. The gear case 12 and the motor 24 are arranged on the same axis with the opening of the outer shell 21 facing down, and the motor 24 is attached to the gear case 12.
[0020]
At this time, as shown in FIG. 2, a horseshoe-shaped sheet metal member 25 is applied to the opposite side of the surface of the outer shell 21 that contacts the gear case 12, and the motor 24 is attached to the gear case 12 with screws 26.
[0021]
The rotor 23 is configured by disposing a magnet 28 on a bottomed cylindrical rotor member 27, and a fitting hole 29 is provided in the center of the bottom of the rotor member 27. The mechanism input shaft 19 is fitted. Other configurations are the same as those of the conventional example.
[0022]
The operation in the above configuration will be described. In the washing and rinsing stroke, the clutch driving means 20b of the clutch mechanism 20 releases the spring clutch 20a so that the rotational force cannot be transmitted to the dewatering shaft 7. The power of the motor 24 is only transmitted to the agitation blade 5 via the washing shaft 9, and mechanical force is applied to the laundry in the washing / dehydrating tub 4. In this way, washing and rinsing of the laundry stored in the washing / dehydrating tank 4 proceeds.
[0023]
When the washing process is finished, the dehydration process is started. In this dehydration process, the water in the washing / dehydration tub 4 is drained, and the clutch driving means 20b of the clutch mechanism 20 drives the spring clutch 20a, thereby applying a rotational force to the dehydrating shaft 7. It is assumed that it can be transmitted. The power of the motor 24 is connected to the speed reduction mechanism input shaft 19 and the dewatering shaft 7, and the washing and dewatering tub 4 rotates.
[0024]
As the washing and dewatering tub 4 rotates, the moisture of the laundry that has finished washing and rinsing is squeezed into the water receiving tub 3 from the holes provided on the side surface of the washing and dewatering tub 4 by centrifugal force. Thus, the laundry is automatically dehydrated. In this way, the laundry put into the washing and dewatering tub 4 is automatically washed, rinsed, and the dehydration process is completed.
[0025]
Here, since the motor 24 has the outer shell 21 in which the stator 22 is molded by resin, insulation from the rotor 23 and the speed reduction mechanism input shaft 19 can be secured, and the outer shell 21 is cup-shaped. Since the gear case 12 and the motor 24 are arranged on the same axis with the opening of the outer shell 21 facing down, water does not enter the motor 24, and the insulation is deteriorated due to water intrusion. Can be prevented and safety can be improved.
[0026]
Further, when the motor 24 is attached to the gear case 12, the horseshoe-shaped sheet metal member 25 is applied to the outer shell 21 formed of resin, and the screw 26 is fastened and attached. Therefore, when the screw 26 is fastened, the screw 26 is locally attached. The sheet metal member 25 can disperse the force, and even when the outer shell 21 is formed with a thin wall thickness, the outer shell 21 can be prevented from breaking and the motor 24 can be firmly attached. Moreover, since the thickness of the outer shell 21 can be reduced, the cost can be reduced and the height in the height direction can be reduced.
[0027]
In the present embodiment, the sheet metal member 25 is formed in a horseshoe shape, but the same effect can be obtained even in a ring shape.
[0028]
(Example 2)
As shown in FIG. 3, the outer shell 21a is formed in a cup shape by molding a stator 22a with resin, and a rotor 24a is opposed to the stator 22a to constitute a motor 24a. The gear case 12 and the motor 24a are arranged on the same axis with the opening of the outer casing 21a facing down, and the motor 24a is attached to the gear case 12.
[0029]
The rotational speed detection device 30 detects the rotational speed of the motor 24a. The rotational speed detection device 30 is attached to the upper part of the motor 24a and is provided with a detection unit 31 composed of a Hall IC or the like facing the rotor 23a. It arrange | positions in the outer shell 21a. Other configurations are the same as those of the first embodiment.
[0030]
Describing the operation in the above configuration, since the detection unit 31 configured by a Hall IC or the like is opposed to the rotor 23a, the lead portion is upward and the length of the lead portion becomes unstable. For this reason, even if the rotation speed detection device 30 including the detection unit 31 is coated with resin and covered with insulation, the lead portion may be exposed.
[0031]
Even in this case, by disposing the detection unit 31 in the outer casing 21a of the motor 24a, an insulation distance from the gear case 12 can be ensured, and safety can be ensured.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, the decelerating mechanism input shaft and the dehydrating shaft that are provided in the lower portion of the washing tub / dehydrating tub and are provided on the same axis are incorporated. A gear case with a built-in reduction mechanism that reduces the rotational speed of the input shaft of the reduction mechanism and transmits it to the stirring blades, an outer case in which a stator is molded with resin, and a magnet that is provided inside the outer case and faces the stator. A clutch mechanism comprising a configured rotor and a spring clutch and clutch driving means for releasing the spring clutch to switch the rotation of the rotor to only one of the speed reduction mechanism input shaft, the dehydration shaft and the speed reduction mechanism input shaft The rotation shaft of the rotor, the speed reduction mechanism input shaft and the dehydrating shaft are configured to be located on the same axis, and the outer shell is cup-shaped. Is formed, is attached at a plurality of screws to the bottom surface of the gear case through a ring or horseshoe shape of the sheet metal member from the opening side against the bottom surface of the to bottom surface molded with resin in the lower openings wherein the gear case In addition, the rotor is formed in a bottomed cylindrical shape with the bottom portion down, and the center of the bottom portion is attached to the lower end of the speed reduction mechanism input shaft using a screw, so that the rotor can rotate with respect to the outer shell. The spring clutch is located in a space provided in the rotor, and the clutch driving means is located outside the outer shell. Insulation deterioration due to intrusion can be prevented, safety can be improved, and when attaching the motor to the gear case, a ring or horseshoe is attached to the outer shell made of resin By attaching and fixing the screw with the sheet metal member, the partial load applied by the screw can be dispersed, so the strength of the mounting surface can be increased, and the outer shell cracks with the force at the time of screw tightening This can be prevented, the motor can be firmly attached, and the height in the height direction can be reduced.
[0033]
According to the second aspect of the present invention, a rotational speed detection device that detects the rotational speed of the rotor is attached to the upper part of the outer shell, and at least the detection part of the rotational speed detection device is attached to the inner peripheral surface of the rotor in the outer shell. Since they are arranged to face each other, at least the detection part of the rotation speed detection device is arranged in the outer shell of the motor, so that an insulation distance from the gear case can be ensured and safety can be ensured.
[Brief description of the drawings]
FIG. 1 is a partially cutaway cross-sectional view of a washing machine drive device according to a first embodiment of the present invention. FIG. 2 is a bottom view of a sheet metal member of the washing machine drive device. FIG. 4 is a partially cutaway sectional view of a washing machine drive device of the embodiment of the present invention. FIG. 4 is a sectional view of a washing machine equipped with a conventional washing machine drive device. FIG. 5 is a partially cutaway view of the washing machine drive device. Sectional view [Explanation of symbols]
4 Washing and Dehydrating Tank 10 Reduction Mechanism 12 Gear Case 19 Reduction Mechanism Input Shaft 21 Outer 24 Motor 25 Sheet Metal Member

Claims (2)

A speed reduction mechanism which is provided in the lower part of the washing tub / dehydration tub and has a speed reduction mechanism input shaft and a dewatering speed shaft provided on the same axis and transmits the speed reduction speed of the speed reduction mechanism input shaft to the stirring blade A gear case incorporating a stator, a shell molded with a stator made of resin, a rotor provided inside the shell and having a magnet disposed facing the stator, a spring clutch and a clutch for driving to release the spring clutch a clutch mechanism for switching the rotation of the rotor consists of a drive unit to one of said speed reduction mechanism input shaft and the dewatering shaft said reduction mechanism input shaft only, the a rotational axis of the rotor speed reduction mechanism input shaft and the dewatering shaft Is configured so as to be positioned on the same axis, and the outer shell is formed in a cup shape and has a bottom surface molded with resin with the opening facing down. Mounted against the bottom of the serial gear case through a ring or horseshoe shape of the sheet metal member from the opening side at the plurality of screws to the bottom surface of the gear case Rutotomoni, the rotor is a bottomed cylindrical shape with the bottom down The bottom center is attached to the lower end of the speed reduction mechanism input shaft with a screw so that it can rotate with respect to the outer shell, and the spring clutch is installed in a space provided inside the rotor. The washing machine drive device is configured to be positioned and the clutch drive means is located outside the outer shell.   2. The washing machine according to claim 1, wherein a rotation speed detection device for detecting the rotation speed of the rotor is attached to an upper portion of the outer shell, and at least a detection portion of the rotation speed detection device is arranged to face an inner peripheral surface of the rotor in the outer shell. Drive device.

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