JPH0696071B2 - Washing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a washing machine.

(B) Conventional Technology Conventionally, various washing machines have been proposed in which the rotational force of a drive motor is transmitted to a rotary vane and a washing / dehydrating tub via a clutch mechanism. Proposed in No. 61-103496. Hereinafter, description will be given with reference to FIGS. 2 and 3.

FIG. 2 shows a general washing machine, 1 is a machine casing, 2 is a machine casing 1
An operation part provided in the upper rear part of the machine, 3 is an outer tub provided in the machine casing 1, 4 is an inner tub provided in the outer tub 3, and has a dewatering hole 5 ... Reference numeral 6 is a rotary blade disposed at the bottom of the inner tub 4, and 7 is a drive motor, which is connected to the inner tub 4 and the rotary blade 6 via a power transmission mechanism 8. At times, both the inner tank 4 and the rotary blade 6 are rotated at high speed in one direction. Reference numeral 9 is a drain port provided at the bottom of the outer tub 3, 10 is a drainage solenoid valve, 11 is a drain hose, and 12 is an air trap provided at one corner of the bottom of the outer tub 3, and pressure is applied to the water level sensor 13 in the operation unit 2. It communicates via a hose 14. Reference numeral 15 is a water supply solenoid valve provided in the water supply passage 16.

FIG. 3 is a detailed explanatory view of the drive unit, in which the bottom of the outer tank 3 is -Shaped mounting base 17 is screwed onto both ends of the mounting base 17 protruding from the outer tub 3, and a hemispherical-shaped seat for a suspension rod (not shown)
18,18 are formed integrally. Further, a similar seat is integrally formed in the lower part of the side wall of the outer tub 3 in a direction perpendicular to the line connecting the seats 18, 18, and a hemispherical body and a compression spring ( Both are not shown), and the outer tub 3 is elastically suspended and supported in the machine frame by a suspension rod. At both ends in the opposite longitudinal direction of the mounting base 17, flange portions 19, 1
9 is bent, and the inner tank 4 is provided at the center of the mount 17.
The case 22 of the upper bearing 21 that supports the drive shaft 20 is integrally formed. Lower bearing 23 of the drive shaft 20
The case 24 is screwed to the flange portions 19, 19. The flanges 19 and 19 further include a motor 7 and a drain valve 1
A solenoid 25 that opens and closes the drain valve 10 and the drain valve 10 via a connecting rod 26 is screwed.

A blade shaft 27 of the rotary blade 6 penetrates through the drive shaft 20, and a pulley 28 is fixed to a lower end thereof. The pulley 28 and a pulley 29 fixed to a motor shaft are connected via a belt 30. Reference numeral 31 is a clutch that controls the transmission of power to the drive shaft 20.

Reference numeral 32 is a brake drum, which is fixed to the drive shaft 20 with a screw 33. A brake band 35 having a brake shoe 34 on its inner surface is elastically fitted to the brake drum 32.

Reference numeral 36 is a cylindrical clutch boss, 37 is a brake ring having an inverted U-shaped cross section, slits 38 are formed on both side surfaces, and a hole having the same diameter as the inner diameter of the clutch boss 36 is provided at the center of the upper surface. The clutch boss 37 is welded to the peripheral edge of the.

Then, the clutch boss 36 (brake ring 37) and the brake drum 32 are inserted into the drive shaft 20 from below, the one-end bent piece 39 of the brake band 35 is fitted into the slit 38 of the brake ring 37, and then the brake is applied. Fix the drum 32 with screws.

Next, 40 is a clutch spring wound (left-handed) around the clutch boss 36, and its lower end 41 is at the mounting base 17
It is fixed by a pin 42, and the upper end 43 is inserted into an upward recessed groove 45 formed at one end of an operating lever 44 fixed to the connecting rod 26.

Reference numeral 46 is a clutch spring for preventing reverse rotation of the inner tank 4, and the clutch spring 40 is attached to the brake drum 32.
And the lower end 47 is fixed to the case 24 of the lower bearing 23.

Further, 48 is a clutch piece that is engaged / disengaged with a ratchet wheel 49 of the clutch 31 in conjunction with the connecting rod 26, and when engaged, displaces the ratchet wheel 49 and simultaneously engages with the ratchet wheel 49. By displacing one end of the worn clutch spring 50 in the expansion direction, the transmission of power to the drive shaft 20 is released.

Thus, at the time of dehydration, the solenoid 25 is excited, the connecting rod 26 is pulled in the depth direction in FIG. 3, and the drain valve 10 is opened. At the same time, the clutch piece 48 is disengaged from the clutch 31, power is transmitted to the drive shaft 20, and the operating lever 44 displaces the upper end 43 of the clutch spring 40 in the expanding direction, so that the drive shaft 20 (internal The tank 4) rotates counterclockwise.

Next, at the end of dehydration, the excitation of the solenoid 25 is cut off,
The drain valve 10 closes. At the same time, the clutch piece 48 engages with the clutch 31, the transmission of power to the drive shaft 20 is cut off, and the operating lever 44 moves the clutch spring 40.
The upper end 43 of the is displaced in the tightening direction (the front direction in FIG. 3).

Then, as the clutch boss 36 rotates, the clutch spring 40 is further tightened to lock the rotation of the clutch boss 36. Therefore, the brake ring 37 is also in the fixed state, and the brake ring 37 and the brake band 35 are in the locked state, which is also in the fixed state. In this way, a frictional force is generated between the brake shoe 34 and the rotating brake drum 32, the drive shaft 20 is braked, and the inner tank 4 is stopped.

Now, during washing, since only the drive shaft 20 rotates, the rotary blades 6 are flipped left and right. At this time, the inner tub 4 also tries to rotate due to the reaction of rotation of the rotary blades 6, but the clutch spring 40 is closed in the leftward rotation, so that the braking force acts as described above and the inner tub 4 rotates. Is blocked. Also, when rotating to the right, the clutch spring
Because the clutch spring 40 is in the direction of expanding 40,
However, since the clutch spring 46 wound around the brake drum 32 is tightened, the brake drum 32 is locked and rotation of the inner tank 4 is prevented.

In such a washing machine, the braking noise during braking is very low, but the clutch spring for preventing the reverse rotation is used.
Frequent accidents occur when 46 is cut or its fixed end is damaged. Therefore, in place of the clutch spring 46, a roller clutch that can rotate only in one direction is used, as disclosed in Japanese Utility Model Publication No. 60-31672.

The one-way rotation roller clutch 51, as shown in FIG. 4, when the drive shaft 20 rotates in the dehydration direction (FIG. 4A),
Each roller 52 of the roller clutch 51 has a ratchet groove 53 ...
Is released from its bound state and can rotate freely, and due to the influence of the washing water flow, etc., the inner tub 4 (driving shaft 20) at the time of washing
When it tries to rotate in the direction opposite to the dehydration direction (Fig. 4B), each roller 52 of the roller clutch 51 is in the ratchet groove.
It is caught by 53 and prevents the drive shaft 20 from rotating.

(C) Problems to be Solved by the Invention In the washing machine in which the drive shaft 20 is equipped with the roller clutch 51 as described above, the upper and lower bearings 21,
In addition to 23, the roller clutch 51 is fixed and exists.

Thus, the core of the roller clutch 51 is the upper and lower bearings 21, 23.
If it does not match the core of the drive shaft (core of drive shaft 20), the roller clutch
Not only does 51 rub against the drive shaft 20 undesirably, smooth rotation of the drive shaft 20 is hindered, but also the roller clutch 51 wears undesirably and eventually the reverse rotation preventing ability cannot be exerted.

It is extremely difficult to align the core of the roller clutch 51 with the cores of the upper and lower bearings 21 and 23 when fixing the roller clutch 51.For example, as shown in JP-B-60-31672, the roller clutch housing is screwed. In the case of tightening and fixing, the roller clutch moves during this tightening and the core is apt to move.

In view of such problems, the present invention undesirably rubs the roller clutch for preventing reverse rotation of dehydration during washing from the drive shaft,
An object of the present invention is to provide a washing machine capable of significantly suppressing with a simple configuration that smooth rotation of the drive shaft is hindered or the roller clutch is undesirably worn and eventually cannot exhibit the reverse rotation preventing ability. is there.

(D) Means for Solving the Problems The present invention relates to a washing machine that transmits the rotational force of a drive motor to a washing and dehydrating tub through a clutch mechanism, and a bearing that rotatably supports a drive shaft of the dehydrating tub. A roller clutch for one-way rotation, which is arranged on the outer periphery of the drive shaft of the dehydration tank and restricts rotation of the dehydration tank in the reverse rotation direction, a housing in which the roller clutch is installed, and a horizontal direction formed from the housing. A flange, a mounting hole formed in the flange, a bolt penetrating the mounting hole and fixed to the case of the bearing, and the bolt formed between the bolt and the inner peripheral edge of the mounting hole. Is provided with a gap that moves in the radial direction of the drive shaft.

Further, it is interposed between the inner peripheral edge of the mounting hole and the bolt, and the vibration noise is suppressed by preventing the bolt from directly contacting the inner peripheral edge of the mounting hole when the housing moves through the gap. It is provided with a sound deadening member.

Further, the housing is composed of an accommodating body that houses the roller clutch and a resin holding member that surrounds and holds the accommodating body, and the flange is integrally formed from this holding member.

(E) Action By providing a gap between the inner peripheral edge of the mounting hole of the housing and the bolt and giving a certain amount of movement to the movement of the housing, the roller clutch itself can freely move in the radial direction within this range, The roller clutch does not rub against the drive shaft undesirably, ensuring smooth rotation of the drive shaft.

Furthermore, the noise reduction member interposed between the inner peripheral edge of the mounting hole and the bolt suppresses the vibration noise generated when the housing moves within a comfortable range.

Furthermore, by making the flange made of resin, the vibration noise can be suppressed without using a sound deadening member.

(F) Example An example of the present invention will be described with reference to FIG. However, the same parts as those in the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

Reference numeral 54 denotes a steel housing that internally houses the roller clutch 51, and holds the roller clutch 51 on the outer periphery of the drive shaft 20. A flange 55 is formed in the horizontal direction on the outer periphery of the housing 54, and the flange 55 has three
Mounting holes 56 are opened at the points. 57 ... is the mounting hole 56
A bolt that penetrates through and is fixed to the lower bearing case 24. The bolts 57 ... Insert the head 57a having a larger diameter than the mounting holes 56, and the mounting holes 56 ...
... A shaft portion 57b having a smaller diameter and the lower bearing case 24
And a threaded portion 57c that penetrates the inside of the screw hole of
On the back side of the lower bearing case 24, the nuts 58 are tightened and fixed.

59 ... is made of resin or rubber (polyurethane rubber, etc.) interposed between the mounting holes 56 ... and the lower bearing case 24.
It is a ring-shaped special washer such as polyacetal resin, the outer diameter of which is larger than the diameter of the mounting holes 56 ... And the inner diameter matches the shaft diameter of the shaft portion 57b. 60 ... is the mounting hole 56 ...
Is a cylindrical thrust collar (silencing member) interposed between the shaft 57b and the shaft portion 57b, and is made of the same material as the special washer 59, and the inner peripheral edge of the mounting hole 56 before insertion of the bolt 57. Is formed on the upper end of the tubular portion 61 by the elastic force of the tubular portion 61, and the tubular portion 61 is closely contacted with the upper surface of the flange 55.
It is composed of a collar portion 62 that regulates the deviation of the gap.

The inner diameter of the cylinder portion 61 of the thrust collar 60 is larger than the shaft diameter of the shaft portion 57b, and the radial gap C ₁ (about 0.5 mm to ₁ mm) between the thrust collar 60 and the shaft portion 57b. To form. Further, the axial length of the shaft portion 57b is set to be an axial gap C ₂ (0.2) between the thrust collar 60 and the head portion 57a.
mm to 0.8 mm). The special washer 59 and the thrust collar 60 may be integrally formed.

63 is an oil seal press-fitted between the inner surface of the upper end of the housing 54 and the drive shaft 20.
Prevents water droplets, sand, dust, or grease different from the grease used in the roller clutch 51 (used in the clutch spring 40) from entering the roller clutch 51. There is.

Thus, when the drive shaft 20 rotates, the roller clutch 51
The housing 54 moves in the range of the gaps C ₁ and C ₂ and automatically aligns the roller clutch 51 with the upper and lower bearings 21 and 23. The vibration of the housing 54 generated by the housing 54 by the provision of the clearance C _1, C ₂ is moved between the gap C _1, C ₂ corresponds to the bolt 57 ... and the lower bearing case 24 The sound is silenced by the special washer 59 and the thrust collar 60 made of an elastic material. Further, even if rust occurs on the surface of the housing 54 due to the existence of the gaps C ₁ and C ₂ , there is no fear that the mounting state of the housing 54 will be displaced due to this rust. Since the gaps C ₁ and C ₂ are filled with grease, there is no fear of rusting the bolt 57.

FIG. 5 shows another embodiment in which a radial gap C ₁ is formed between the thrust collar 60 and the mounting hole 56.

Further, in FIG. 1, by forming a gap between the thrust collar 60 and the special washer 59, the frictional resistance when the housing 54 is moved in the radial direction is reduced, which facilitates the movement. .

The present embodiment is intended for self-alignment of the roller clutch 51, and if the vibration noise of the housing 54 is not taken into consideration, the sixth embodiment
An embodiment as shown is also conceivable. Also, in the figure,
If the housing 54 is made of cast iron such as aluminum die cast and the gaps C ₁ and C ₂ are made minute (0.1 mm to 0.3 mm), the vibration noise is extremely reduced.

7 and 8 show a fourth embodiment, which will be described below.

Reference numeral 64 denotes a resin holding member that surrounds and holds the housing 65 (container), and a brim 67 (flange) provided with a mounting hole 66 for attaching to the lower bearing case 24 is extended in three directions. ing. Like the mounting holes 56 of the first embodiment, the mounting holes 66 are sized so as to form radial and axial gaps C ₁ and C ₂ with the bolts 57. It is set. The holding member 64 and the housing 65 have an uneven portion for spline (serration) connection with each other.
68 and 69 are formed on the respective coupling surfaces, and the housing 65 is press-fitted into the holding member 64 or inserted at the time of molding the holding member 64 to fix the two members.

In the fourth embodiment, since the holding member 64 is made of resin, the vibration noise of the housing can be absorbed without using a separate member such as the special washer 59 and the thrust collar 60 of the first embodiment. it can. Further, the cost is lower than that of providing the flange 55 on the steel housing 54.

Incidentally, in the fourth embodiment, the holding member 64 also belongs to the concept of the housing of the present invention.

(G) Effect of the Invention According to the configuration of the washing machine of the present invention, by providing a gap between the inner peripheral edge of the mounting hole of the housing and the bolt, the movement of the housing can be given some leeway, and the roller clutch is provided. It is possible for itself to move freely in the radial direction within this range. Therefore, the roller clutch does not rub against the drive shaft undesirably, the smooth rotation of the drive shaft is ensured, and it is possible to prevent the roller clutch from being undesirably worn and eventually failing to exhibit the reverse rotation preventing ability. .

In addition, as a structure that allows the roller clutch to move in the radial direction, it is only necessary to provide a gap between the inner peripheral edge of the mounting hole of the housing and the bolt, and the structure can be simplified.

Further, the noise damping member interposed between the inner peripheral edge of the mounting hole and the bolt suppresses the vibration noise generated when the housing moves within the space.

Furthermore, by making the flange made of resin, the vibration noise can be suppressed without using a sound deadening member.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part of a washing machine of the present invention, FIG. 2 is an internal mechanism diagram showing a cross-section of an essential part of a conventional washing machine, FIG. B is an operation explanatory view of the roller clutch, FIGS. 5 and 6 are equivalent to FIG. 1 in the second and third embodiments, and FIG. 7 is equivalent to FIG. 1 in the fourth embodiment. 8 and 9 are sectional views taken along the line AA '. 4 ... Inner tank (washing / dehydrating tank), 6 ... Rotor blades, 7 ... Drive motor, 20 ... Drive shaft, 24 ... Lower bearing case, 31 ... Clutch, 51 ... Roller clutch, 54 , 65 ...
… Housing, 56 …… Mounting hole, 64 …… Holding member, C ₁ , C ₂
……gap.

Claims (3)

[Claims] 1. A washing machine for transmitting a rotational force of a drive motor to a washing and dehydrating tub through a clutch mechanism, and a bearing for rotatably supporting a drive shaft of the dehydrating tub and an outer periphery of the drive shaft of the dehydrating tub. A roller clutch for one-way rotation, which restricts rotation of the dehydration tank in the reverse rotation direction, a housing in which the roller clutch is installed, a flange formed in a horizontal direction from the housing, and a flange formed in the flange. Is formed between the bolt and the inner peripheral edge of the mounting hole, and the housing moves in the radial direction of the drive shaft. A washing machine characterized by having a gap. 2. The vibration is interposed between the inner peripheral edge of the mounting hole and the bolt so that the bolt does not directly contact the inner peripheral edge of the mounting hole when the housing moves through the gap. The washing machine according to claim 1, further comprising a sound deadening member for suppressing sound. 3. The housing is composed of a housing body containing the roller clutch and a resin holding member surrounding and holding the housing clutch, and the flange is integrally formed from the holding member. The washing machine according to claim 1.