JP3552893B2 - Sintered oil-impregnated bearing - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sintered oil-impregnated bearing that is easy to attach to a thin plate member and is suitable for, for example, an acoustic device, a small motor, and a case where the mounting portion of the bearing is formed of a thin plate.
[0002]
[Prior art]
The shape of the sintered oil-impregnated bearing is basically a straight cylinder, and the mounting to the equipment is usually provided with mounting holes of the required depth in the housing of the equipment, and means for press-fitting and fixing the bearings into these holes. Is used.
[0003]
[Problems to be solved by the invention]
However, this is a case where the thickness of the housing portion is sufficiently large, for example, a cast material, and when the housing portion is formed of a plate material such as a metal or a synthetic resin, the thickness of the mounting hole is small. However, the press-fitted bearing cannot be supported by the inner surface of the hole. In such a case, it is conceivable to join a cylindrical member for supporting the bearing to the mounting hole, but the number of parts and the number of manufacturing steps are increased, and the cost on the device side is increased.
[0004]
Therefore, an object of the present invention is to provide a sintered oil-impregnated bearing that can be mounted on a device side without modification and that can be used even when the thickness of the mounting hole is slightly different. .
[0005]
[Means for Solving the Problems]
As shown in FIG. 1, a flange 20 is provided at one end of the sintered oil-impregnated bearing 10, and a bank 30 is provided concentrically with the bearing 10 on the same side of the flange as the bearing 10. This ridge 30 is for clamping the plate 40 of the device between the flange 20 (to be precise, the periphery of the mounting hole), and therefore, the ridge 30 has a vertical outer periphery and a mounting plate. The outer diameter is set to fit the hole.
[0006]
The height of the bank is not uniform over the entire circumference, and high portions 31 and low portions 32 are provided alternately. This is the gist of the present invention, which can be widely used even when the thickness of the mounting portion is different. It is preferable that the high portion 31 and the low portion 32 are arranged at least three places at equal intervals over the entire circumference in order to make the mounting strength uniform.
[0007]
If the inner periphery of the embankment is an inclined surface and a recess 33 is provided at the boundary between the high portion 31 and the low portion 32, the caulking operation becomes easy. When such a shape is formed by machining, a large number of man-hours are required. However, in the case of powder metallurgy, it is easy to form the required irregularities on a molding die (in this case, a lower punch) so that it can be easily formed. It can be integrally molded. Although a bronze-based alloy having an effective porosity of about 10 to 30% by volume is often used for a sintered oil-impregnated bearing, the present invention is basically not related to the material, and may be any iron-based, aluminum-based, or any other sintered alloy. Applicable to binding gold.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
When this bearing is inserted into the mounting hole, the flange 20 comes into contact with the lower surface of the plate to prevent it from falling off. On the upper surface of the plate, if the thickness of the plate is larger than the height of the low portion 32, only the high portion 31 On the other hand, when it is small, both the high part 31 and the low part 32 show faces. Then, the bearing is firmly fixed to the plate material by pressing the exposed portion (hereinafter, referred to as a swaging allowance) with a swaging jig or the like to plastically deform outward.
[0009]
By the way, if the crimping allowance is too small, it cannot be caulked sufficiently.On the other hand, if it is too large, the amount of plastic deformation at the time of caulking will be excessive, causing cracks and other defects. It is limited to a certain narrow range. Conventionally, there has been an example in which a bank with a uniform height is provided around the entire circumference. However, in this method, it is almost impossible to apply a bearing designed according to a certain plate thickness to equipment having a different plate thickness. Even if the diameter and the length of the bearing were the same, when the plate thickness was different, a bearing with different specifications had to be prepared each time.
[0010]
This means that at the bearing manufacturing stage, there are problems such as multi-product production using dedicated molding dies and sizing dies for each specification and the accompanying increase in costs. Means that there is a problem such as an increase in the number of parts to be handled and an associated misuse in the assembling process. However, in the case of the present invention, at least one of the high portion and the low portion of the embankment has a high versatility with respect to a change in plate thickness in order to generate a sufficient caulking effect, and as a result, the number of parts is reduced, standardization of equipment design, etc. Effect is brought about.
[0011]
(Example) A flanged sintered oil-impregnated bearing having the shape shown in Fig. 1 and having three high portions 31 and low portions 32 of the bank 30 alternately arranged at three locations, the entire circumference of which is equally divided into six, was prepared. FIG. 2 shows a state in which the bearing 10 is inserted from below into a mounting hole 41 provided at a predetermined position of a plate material 40 of the device. (B) of the same figure shows a case where the plate material is thick and only the high portion 31 of the levee protrudes from the upper surface thereof, and (c) shows a case where the plate material is thin and both the high portion 31 and the low portion 32 of the levee protrude. Shows the case.
[0012]
In this state, when the flange portion of the bearing is supported from below and the bank is pressed from above by a caulking jig, the caulking margin is plastically deformed, and the state shown in FIG. 3 is obtained. (A) corresponds to (b) of FIG. 2, in which the lower portion 32 of the embankment remains in the mounting hole, and the higher portion 31 functions as a swaging margin, and the plate is sandwiched between the flange 20 and the swaging. It is fixed.
[0013]
On the other hand, (b) of FIG. 3 corresponds to (c) of FIG. 2. In this case, the high portion and the low portion of the embankment are caulked, but the caulking strength is mainly carried by the low portion 32. Even if a crack or the like occurs in the swaged portion 31, there is no particular problem. Needless to say, the high portion 31 also contributes to the swaging strength if the swaging allowance is within an appropriate range. If there is no problem in the configuration of the device, only the low portion 32 may be pressed and caulked with a caulking jig, and the high portion 31 may be left as it is.
[0014]
In this way, even if the thickness of the plate material is different, or even if the thickness of the same device is different depending on the part, the thickness of each plate is suitable for the high part of the embankment and According to the present invention, it is not necessary to prepare a variety of products having different specifications as long as the bearings are between the two types.
[0015]
【The invention's effect】
As described in detail above, according to the present invention, it is not necessary to particularly take any action on the device side when mounting the sintered oil-impregnated bearing, and it is only necessary to provide a predetermined mounting hole in the plate material of the device. Furthermore, even when the thickness of the plate material is different, since it is caulked at at least one of the high portion and the low portion of the embankment, it has high versatility with respect to the change in the thickness of the mounting portion, and as a result, the number of parts is reduced, and the equipment is reduced. Beneficial effects such as standardization of design can be obtained.
[Brief description of the drawings]
FIG. 1 is a view illustrating the appearance of a sintered oil-impregnated bearing according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating a state where the bearing of the present invention is inserted into a mounting hole of a plate material.
FIG. 3 is a cross-sectional view showing a state where the bearing is caulked and fixed to a plate material from the state of FIG. 2;
[Explanation of symbols]
10 ... sintered oil-impregnated bearing, 20 ... flange, 30 ... (for caulking) embankment,
31 ... high part (of the embankment) 32 ... low part (of the embankment) 33 ... dent,
40: plate material, 41: mounting hole.

Claims (2)

A sliding bearing to be attached to a thin plate portion of a device, wherein a flange 20 is formed at the lower end of a cylindrical bearing 10 and a ridge 30 for caulking is formed integrally therewith concentrically with the bearing. 31 and the lower portion 32 are alternately arranged on the entire circumference, and the outer diameter of the embankment is set to a size that fits into the mounting hole of the plate material. A sintered oil-impregnated bearing having a high versatility with respect to a change in the thickness of the mounting portion, wherein at least one of the bearings is set to be larger than the thickness of the mounting portion. A flange 20 is formed at the lower end of the cylindrical bearing 10, and a ridge 30 for caulking is formed integrally therewith concentrically with the bearing, and the ridge 30 alternates with a high portion 31 and a low portion 32 over the entire circumference. Using a sintered oil-impregnated bearing that is evenly arranged and whose outer diameter is set to a size that fits into the mounting hole of the plate, insert this bearing into the mounting hole of the plate and attach a flange to the lower surface of the plate. The thin plate of the device, wherein the plate is sandwiched between flanges and fixed by caulking at least one of the high portion 31 and the low portion 32 of the bank exposed from the upper surface of the plate. How to attach a sintered oil-impregnated bearing to the part.

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