JPH0321738Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to a clutch bearing that regulates the rotation of the washing tub of a single-tub electric washing machine. [Prior Art] A single-tub electric washing machine performs washing and dehydration continuously in the same tank. Normally, during washing and rinsing, only the pulsator installed at the bottom of the washing tub rotates at a low speed. Clothes are massaged and washed, and when dehydrating, the pulsator and washing tub rotate together at high speed to centrifugally dehydrate the clothes. Such single-tub electric washing machines are designed so that rotation is transmitted to the pulsator and washing tub from the same drive shaft, but the pulsator rotates during washing and rinsing, when the washing tub should normally be stopped. There is a risk that the washing tubs will rotate together. Therefore, in order to regulate the rotation of the washing tub, a clutch bearing having a built-in needle one-way bearing, for example, is usually incorporated into the rotational driving portion of the washing tub. The clutch bearing shown in FIG. 4 is commonly used as the clutch bearing. That is, this clutch bearing 1 includes a boss portion 1a having a through hole 3 into which a needle one-way bearing 2 can be fitted;
It consists of a circular base part 1b, and three bearing fixing holes 4 for fixing the clutch bearing 1 are equally bored concentrically in the base part 1b. The clutch bearing 1, as shown in FIG.
It is externally fitted via a needle one-way bearing 2 to a cylindrical portion 13a of an outer cylinder 13 provided outside a main shaft 12 that rotates a washing tub 10 and a pulsator 11 of an electric washing machine. A one-way spring clutch 1 is provided on the outside of the lower end of the outer cylinder 13.
4 is attached, and when the pulley 20 is rotated in the direction in which the one-way spring clutch 14 is tightened, the pulley 20 and the outer cylinder 13 become integral, and together with the main shaft 12,
The outer cylinder 13 is also adapted to rotate. The rotation of the outer cylinder 13 is transmitted to the gear case 15, and the guide shaft 16 is inserted into the upper end of the gear case 15.
The washing tub 10 fixed to the upper end thereof is rotated through. This rotation is used during dehydration. Further, the rotation of the main shaft 12 is controlled by the planetary gear group 1.
7, and rotates a pulsator shaft 19 which is disposed coaxially with the main shaft 12 and splined to a lid 18 which fixes the rotating shaft of the planetary gear group 17. Pulsator shaft 1
A pulsator 11 is attached to the upper end of the washing machine 9, and this rotates to create a water flow during washing and rinsing. In the rotation drive mechanism described above, if the direction of rotation of the pulsator 11 is constant during washing and rinsing, in order to fix the washing tub 10 and rotate only the pulsator 11, use the one-way spring clutch 14 described above.
It is sufficient to set the operation so that it is released in this direction of rotation. However, in order to create a reverse water flow that periodically repeats clockwise and counterclockwise rotations, the main shaft 12 must be periodically reversed. At this time, if the rotation direction is reversed so that the one-way spring clutch 14 is tightened, the outer cylinder 13 will rotate together with the main shaft 12, so in this case, the clutch bearing 1 fitted onto the outer cylinder 13 will rotate. Regardless of the operation of the spring clutch 14, the rotation of the outer cylinder 13 is restricted. That is, the needle one-way bearing built into the clutch bearing 1 is set so as not to rotate in the direction of rotation in which the one-way spring clutch 14 is tightened, and prevents the outer cylinder 13 from rotating together. Therefore, in an electric washing machine capable of creating a reverse water flow, the washing tub 10 does not rotate together during washing and rinsing, and can be operated with peace of mind. [Problem to be solved by the invention] However, the rotation speed given to the pulley 20 is usually 800 to 900 rpm, and this rotation is applied to the clutch bearing 1 that regulates the rotation of the outer cylinder 13 to which it is directly transmitted. The torque becomes extremely large. That is, in FIG. 4, in order to restrict the outer cylinder 13 that is about to rotate in the direction of arrow A as the rotation of the main shaft 12 is changed, the hatched portion of the bearing fixing hole 4 of the clutch bearing 1 is Excessive force is applied. In particular, this clutch bearing 1
As can be seen from Fig. 5, the outer cylinder 13 into which the outer cylinder 13 is fitted is supported with sufficient margin between the two ball bearings 21 and 22 to prevent excessive force from being applied even if the axis is slightly misaligned. , the clutch bearing 1 fitted therewith must also have a margin to absorb some looseness. Therefore, the bearing fixing hole 4 of the clutch bearing 1 is made considerably larger than the bearing fixing screw. Therefore, when the outer cylinder 13 rotates, the bearing fixing screw constantly moves rattling within the bearing fixing hole 4, and this movement acts as a large torque around the bearing fixing hole 4. Therefore, if the clutch bearing 1 is thin, deformation occurs around the bearing fixing hole 4, and the clutch bearing 1 is not fixed properly.
This may cause damage to the outer cylinder 13 and the like. For this reason, the conventional clutch bearing 1 cannot deviate from the idea that it has to be thick, and the bearing fixing hole 4 is formed by cutting or the like on the thick base 1b. It was hot. Therefore, since the clutch bearing 1 is thick, the part itself becomes heavy.
As a result, the whole electric washing machine using this becomes heavy, which is undesirable. Further, the clutch bearing 1 has three bearing fixing holes 4,
Although it is formed by cutting, if this cutting is to be carried out, it is necessary to perform several steps using a cold working method, which requires a great deal of labor. Furthermore, since the entire structure is thick, a processing press of 800 tons or more is required, resulting in a high cost product. Therefore, as an improved version, as shown in Figure 6,
The overall wall thickness is slightly thinner, and there are 4 bearing fixing holes.
It has been proposed to have two pieces and cut out the extra base, but the reality is that this has not solved the problem. This invention was devised in view of the above circumstances, and its purpose is to provide a clutch bearing for an electric washing machine that is lightweight and inexpensive. [Means for solving the problem] In order to achieve the above object, the clutch bearing for an electric washing machine of this invention includes a base and a needle one-way bearing that is provided in the center of the base and fitted inside the base. In the clutch bearing for an electric washing machine, the clutch bearing is composed of a through hole and two or more bearing fixing holes provided around the base, the base is formed of a thin iron plate, and the edge of the through hole is The bearing is formed into a protruding cylindrical shape by drawing, and the edge of each of the bearing fixing holes is formed into a protruding cylindrical shape by burring. [Operation] In other words, this invention uses a thin iron plate material as the base, and by drawing a through hole into which the needle one-way bearing can fit, the edge of the hole protrudes from the base in a cylindrical shape. At the same time, the bearing fixing hole is formed by burring so that its edge protrudes from the base in a cylindrical shape. In this way, each cylindrical portion has a very high strength even though it is thin, so that the torque applied to each hole can be dispersed, and the strength against torque is significantly improved. Therefore, even if the overall thickness is reduced, there is no need to worry about strength, and a significant weight reduction can be achieved. In this invention, "thin" means that the thickness is less than 4 mm. Next, this invention will be explained based on examples. [Embodiment] FIG. 1 shows an embodiment of this invention. This clutch bearing 30 consists of a boss part 32 having a through hole 31, and a base part 34 having two bearing fixing holes 33, 33a whose outer peripheral edge protrudes in a cylindrical shape. Inside the through hole 31, as shown in the figure, a needle one-way bearing 2 is provided.
can be fitted. This clutch bearing 30 can be manufactured, for example, as follows. In other words, we first prepare a steel sheet metal with a thickness of 2 mm, and then process it automatically using a 150-ton press using a progressive die.
A hole 35 with a projection as shown in FIG. 2B is obtained by drawing, and then holes 36, 36a with projections as shown in FIG. 2B are formed on both sides of the hole 35 with a projection by burring. This continuous process is completed in about 1.2 seconds. Then, by finishing the upper end surface and inner peripheral surface of the protruded hole 35, a through hole 31 for the needle one-way bearing 2 (see FIG. 1) is obtained. Although the through hole 31 is thin, it has very high strength. In addition, the above-mentioned projection hole 3
Bearing fixing holes 33, 33a (see FIG. 1) are obtained by finishing the upper end surfaces and inner circumferential surfaces of the bearings 6, 36a. Then, the desired clutch bearing 30 can be obtained by forming the outer shape of the sheet metal into a predetermined shape. The clutch bearing 30 obtained in this way is
Even though the base 34 is made of thin sheet metal, the edges of the bearing fixing holes 33, 33a protrude from the base 34 in a cylindrical shape, dispersing the torque applied to the holes. High durability against torque. Therefore, it is extremely lightweight and highly durable. By the way, the example product shown in FIG. 1 has the following differences compared to conventional product 1 shown in FIG. 4 and conventional product 2 shown in FIG.
It has excellent properties as shown in the table below. Note that the comparison example products and comparative example products are both used in the same type of single-tub electric washing machine. In addition, as a comparative example product, a first
A simple through hole corresponding to the through hole 31 in the figure was made, and two through holes corresponding to the bearing fixing holes 33 and 33a in FIG. 1 were made around the through hole.

[Effect of idea]

As mentioned above, the clutch bearing for electric washing machines of this invention has a thin base, but the edge of each bearing fixing hole protrudes into a cylindrical shape to reinforce the hole. It has the excellent characteristics of being lightweight and durable. In addition, the through hole into which the needle one-way bearing fits is formed into a protruding cylindrical shape by drawing, so even though this cylindrical part is thin, it is extremely strong and stably holds the needle one-way bearing. can do. Therefore, an electric washing machine using this clutch bearing is lighter in weight than conventional ones, has a longer lifespan in its driving section, and is a better product.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of this invention, Figs. 2 a and b are longitudinal sectional views explaining the manufacturing process, Fig. 3 is a longitudinal sectional view showing another embodiment, and Fig. 4 is a longitudinal sectional view showing another embodiment. FIG. 5 is a perspective view showing a conventional product, FIG. 5 is a longitudinal sectional view showing its usage, and FIG. 6 is a perspective view showing another conventional product. 31... Through hole, 33, 33a... Bearing fixing hole, 34... Base portion, 40... Bush.

Claims (1)

[Scope of claim for utility model registration] (1) A base, a through hole provided in the center of the base into which a needle one-way bearing can be fitted, and two or more bearings provided around the base. In a clutch bearing for an electric washing machine comprising a fixing hole, the base is formed of a thin iron plate,
An electric washing machine characterized in that an edge of the through-hole is formed to project into a cylindrical shape by drawing, and an edge of each of the bearing fixing holes is formed to project into a cylindrical shape by burring. clutch bearing. (2) The clutch bearing for an electric washing machine according to claim 1, wherein a cylindrical sliding member is fitted inside each of the bearing fixing holes.