JPH0331274Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a centrifugal dehydrator for general household use, and particularly relates to the structure of the bearing metal and the buffer rubber.

BACKGROUND ART Conventionally, a bellows used as a water-sealing bearing mechanism for this type of centrifugal dehydrator has a structure shown in FIG. That is, 1 is a dehydration basket, 2
is a dehydration shaft on which dehydration basket 1 is mounted and supported, and 3
is a buffer rubber consisting of a central shaft bearing part 3A, a relay bellows part 3B at the upper end, and an outer ring part 3C. An inner ring 5 is inserted and integrally molded, and a bearing metal 6 is press-fitted onto the inner surface except for the seal portion 4 at the upper end. The outer ring portion 3C of the buffer rubber 3 is fixed to the bottom 8 of the dehydration tank with a mounting plate 7 in a water-sealed manner, thereby holding the dehydration shaft 2, which transmits the rotational force of the motor to the dehydration basket 1, in a water-sealed manner. ing. That is, the cushioning rubber 3 serves as a water seal and intermediate vibration isolation.

Problems that the invention attempts to solve However, with this structure, the cushioning rubber 3
Since the lower end of the bearing metal 6 press-fitted into the central shaft bearing part 3A of the spindle basket 1 is exposed downward, the spindle basket 1 may swing when started due to unbalance of the clothes etc. placed in the spindle basket 1, or If the movement continues, the motor generates abnormal heat, and this heat is transmitted to the bearing metal 6 via the motor shaft and the dehydration shaft 2. Normally, a sintered oil-impregnated bearing is used as the bearing metal 6, and oil is supplied and absorbed by the rotation of the dehydration shaft 2. However, if the bearing metal experiences an abnormal temperature rise, the impregnated oil or Grease, etc. applied to the water seal part will flow out and be transmitted to the dewatering shaft 2, and the oil will adhere to the brake mechanism connected below, which weakens the braking force of the brake and may lead to a dangerous situation. bearing metal 6
This is dangerous because the dehydrating basket 1 may repeatedly fail to rotate due to seizure with the dehydrating shaft 2 due to lack of oil, and the motor may repeatedly generate abnormal heat.
In the case of a washing machine of the dehydration/rinse type in which dehydration is automatically repeated, there is an increasing possibility that the above-mentioned condition will occur repeatedly due to failure to start the dehydration while the user is away from the washing machine. Further, since a separate manufacturing process of press-fitting the bearing metal 4 after integrally molding the inner ring 3 is required, a new configuration is becoming necessary from the viewpoint of improving productivity.

This invention eliminates the above-mentioned problems and maintains good dewatering and braking operations, as well as eliminating the inner ring that was essential for press-fitting the bearing metal, and using a cushioning rubber designed to save component parts and reduce costs. The purpose is to provide a dehydration device equipped with a.

Means for Solving the Problems In order to solve the above problems, the present invention integrally molds the bearing metal with the cushioning rubber, and the inner diameter of the bearing metal is extended from the lower end of the cushioning rubber that holds the lower end of the bearing metal to the outside of the dewatering shaft. A conical horn-shaped elastic piece smaller than the diameter is made to protrude downward, and its lower end (inner end) edge is brought into close contact with the dehydration shaft.

Function According to this structure of the buffer rubber, oil that flows out without being absorbed from the bearing metal due to an abnormal temperature rise in the bearing metal due to a failure to start the motor, etc., is absorbed by the lower end of the bearing metal because it is integrally molded. In addition to being protected from exposure to
As a result of being temporarily held by the sealing relationship between the horn-shaped elastic piece and the dehydration shaft, it is prevented from entering the lower brake mechanism that is transmitted through the dehydration shaft, and when the motor starts normally, the temporary The oil retained in the bearing is reabsorbed into the bearing metal. Furthermore, by eliminating the inner ring and integrally molding the bearing metal with the buffer rubber, the step of press-fitting it into the center of the buffer rubber is no longer necessary.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIG. 2 shows an outline of the structure of a washing machine including a centrifugal dehydrator according to an embodiment. In the figure, a washing tank (not shown) and a water tank 11 having a dehydration tank 10 are attached to the outer frame 9, and the top A panel box 12 accommodating a lid switch (not shown) and an operation plate 14 on which a printed circuit board 13 is attached are fixed. Reference numeral 15 designates a rotatably supported upper lid, and reference numeral 16 designates a dehydration hatch for covering the opening at the upper end of the dehydration tank 10, to which an inner lid 17 is attached. 18 is a cylindrical dewatering basket made of iron plate or the like, and a plurality of water holes 19 are provided in the side wall.
is provided. On the other hand, the rotational force of the motor 22, which is elastically supported by a suspension structure 21 that is partially erected on a pedestal 20 mounted below the outer frame 9, is dewatered via a brake wheel 23, a dewatering shaft 24, and a coupling 25. The signal is transmitted to the car 18. 2
Reference numeral 6 denotes a buffer rubber which is located approximately in the middle of the dehydration shaft, and has a water seal portion 27 that is slidably close to the periphery of the shaft integrally molded, and a bearing metal 28 made of sintered oil-impregnated metal is integrally molded; It is fixed to the bottom of the water tank 10 with a mounting plate 29 in a water-sealable manner, and holds the dehydration shaft 24 in a water-sealable manner. 30 is a brake mounting plate attached to the upper part of the motor 22, which is energized and held by a spring (not shown), and has a brake shoe 31.
is held rotatably. The sadou lever 33 and the inner wire 3 are opened and closed by the opening and closing operation of the upper lid 15
4, the brake plate 32 is interlocked with the drum 23 to apply the brake.

A first embodiment of the invention adopted in the above washing machine structure is shown in FIG. In FIG. 1, water seal portion 27 of buffer rubber 26
is integrally formed with the buffer rubber 26 inside a bowl-shaped outer ring 35 formed at the upper end of the bearing metal 28, and a lip 36 protruding inward is formed in the middle part of this water seal part 27. The lip 36 is pressed inward by the ring spring 37, and the dewatering shaft 2
4 in a seal-like manner to prevent water from leaking from this circumferential portion. The bearing metal 28 has a plurality of anti-rotation protrusions 3
8 protruding from the outer peripheral wall, and the buffer rubber 26 as described above.
It is integrally molded with. Buffer rubber 26
The fixed part of the bearing metal 28 is made thick, and the dehydration shaft 24
From the lower end of the buffer rubber 26 that surrounds the lower end of the bearing metal 28, an annular elastic piece 39 whose tip is smaller than the outer diameter of the dewatering shaft 24 is integrated. It protrudes and seals around one circumferential portion of the dewatering shaft 24 to prevent oil leakage from this circumferential portion.

In the above configuration, for example, the motor 22
If the engine repeatedly generates abnormal heat while continuing to rotate at low speed, the heat will be transmitted through the brake wheel 23 and the dehydration shaft 24 shown in Figure 2 and reach the bearing metal, resulting in an abnormally high temperature and the impregnated oil. The water flows out along the dehydration shaft 24 without being collected in the pores of the sintered surface. However, since this spilled oil is sealed by the annular elastic piece 39 from the portion of the dehydration shaft 24 below, it is temporarily held between the annular elastic piece 39 and the corresponding portion of the dehydration shaft 24. . Therefore, when the motor 22 returns to normal rotation, the leaked oil moves up the dehydration shaft 24 due to its rotational force and is absorbed into the pores in the sintered surface of the bearing metal 28, again contributing to smooth bearing lubrication. . That is, by reducing oil leakage from the bearing metal 28, seizing between the bearing metal 28 and the dehydration shaft 24 due to lack of oil is eliminated, and the leaked oil is transmitted through the dehydration shaft 24 to the surface of the brake wheel 23. By preventing the reduction of the braking effect due to adhesion to
It is possible to maintain safe and good rotation and brake function of the dewatering basket. In addition, the presence of a plurality of anti-rotation protrusions 38 on the outer wall of the bearing metal 28 that is integrally molded with the buffer rubber, the thickening of the fixing portion of the bearing metal 28, and the fact that the outer wall of the water seal portion 27 has a large number of anti-rotation protrusions 38, The upper end outer ring 35 of the metal 28 provides reinforcement and support for the bearing metal 28.
Since it can fulfill the function of the inner ring 3 shown in the conventional example, the inner ring 3 can be abolished.
Moreover, since the conventional process of press-fitting the bearing metal 4 is not necessary, the buffer rubber 26 can be manufactured at low cost and has a simple structure.

Next, FIGS. 3 and 4 show other embodiments, and in FIG. 3, a cushioning rubber 26 is attached to the lower end of the bearing metal 28 which is integrally molded with the cushioning rubber 26.
A ring-shaped or comb-shaped protrusion 40 of a size that is fitted inside the lower end of the dehydration shaft 2 is provided to protrude downward.
The aforementioned protrusion 40 improves the ability of the buffer rubber 26 to be held against the bearing metal 28, which moves following the whirling movement of the rubber cushion 4.

In addition, FIG. 4 shows a bearing metal 4 attached to a cushioning rubber 42 in which an inner ring 41 is integrally molded, similar to the conventional example.
A thin elastic piece 44 having a substantially conical outer shape with a tip diameter sufficiently smaller than the lower end holding the bearing metal 43 of the buffer rubber 42.
It is a series of . In this structure, when press-fitting the bearing metal 43, press-fit the bearing metal 43 while pushing and expanding the thin elastic piece 44 with a jig (not shown) or the like beyond the outer diameter of the bearing metal 43, and then press-fit the bearing metal 43 into the dewatering shaft. After inserting the dewatering shaft 45 into the bearing metal 43, the thin elastic piece 44 is released from the jig etc. to restore and reduce the outer diameter in order to seal the dewatering shaft 45 with water. By simply changing the shape of the lower end of the buffer rubber 42, it is possible to provide a sealing function against the outflow of oil impregnated in the bearing metal 43.

Effects of the invention As is clear from the above embodiments, by integrally molding the bearing metal with the buffer rubber and by providing an annular elastic piece protruding from the lower end of the buffer rubber that holds the lower end of the bearing metal, By preventing seizure of the bearing metal and dehydration shaft due to oil leakage, and reduction in rotational braking force of the dehydration basket due to oil adhesion to the brake mechanism, it is possible to provide a safe and smooth centrifugal dehydration machine. .

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of an embodiment of the present invention, Fig. 2 is a cross-sectional view of a centrifugal dehydrator in an embodiment of the present invention,
FIG. 3 is a sectional view of a main part of another embodiment, FIG. 4 is a sectional view of a main part showing a modification of the present invention, and FIG. 5 is a sectional view of a main part of a conventional centrifugal dehydrator. 18...Dehydration basket, 24...Dehydration shaft, 26...
Buffer rubber, 27...Water seal portion, 28...
... Bearing metal, 35 ... Outer ring, 39 ... Annular elastic piece.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A buffer rubber made of a bellows-like elastic body is provided that fits approximately in the middle of a dehydration shaft that connects a dehydration cage and a motor, and a bearing metal is attached to the central bearing part of the buffer rubber. At the same time, a water seal part is integrally molded on the upper end of the central shaft bearing, and an annular elastic piece whose tip has an inner diameter smaller than the outer diameter of the dehydration shaft is attached to the lower end of the central shaft bearing of the buffer rubber that surrounds the lower end of the bearing metal. A centrifugal dehydrator characterized in that the tip of the annular elastic piece is brought into seal-like circumferential contact with the dehydration shaft by protruding further downward. (2) A bearing metal is integrally molded on the central bearing part of the buffer rubber, and the water seal part is molded inside an integral bowl-shaped outer ring that protrudes from the upper end of the bearing metal and has a substantially L-shaped cross section. A centrifugal dehydrator according to claim (1) of the utility model registration, characterized in that it is integrally molded with a buffer rubber.