JPH0787678B2 - Sintered oil-impregnated bearing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sintered oil-impregnated bearing in which a porous meshed portion is formed in an inner peripheral surface portion that receives a lateral pressure from a rotating shaft.

(Prior Art) Generally, for a bearing that receives a lateral pressure load from the rotating shaft,
A predetermined aging process is performed in the initial use stage. By the way, the applicant of the present application has already proposed a structure of a so-called agingless sintered oil-impregnated bearing in order to eliminate the aging step. In the agingless sintered oil-impregnated bearing according to this proposal, in the inner peripheral surface portion supporting the rotating shaft, the portion that receives the lateral pressure from the rotating shaft has a more crushed portion than the other inner peripheral surface portions. Are formed. Note that this agingless sintered oil-impregnated bearing has not been published at the time of filing of the present application.

When this agingless sintered oil-impregnated bearing is actually used, as shown in FIG. 8, the hole 1a of the bearing holder 1 having a predetermined shape is opened from both ends of the hole 1a, for example. The sintered oil-impregnated bearings 2, 2 are respectively press-fitted so that the sintered oil-impregnated bearing 2 is held at a predetermined position inside the bearing holder 1. The rotary shaft (not shown) is supported by the pair of sintered oil-impregnated bearings 2, 2. Although the sintered oil-impregnated bearing 2 shown in FIG. 8 has the structure according to the present invention, the press-fitting to the bearing holder 1 is the same as the conventional one.

When a lateral pressure load is applied to the rotary shaft supported by the agingless sintered oil-impregnated bearing, the lateral pressure from this rotary shaft is favorably supported by the crushed portion of the sintered oil-impregnated bearing, and the initial use From the stage, the loss of the familiar current can be kept small.

(Problems to be Solved by the Invention) However, when using such an agingless sintered oil-impregnated bearing, it is naturally necessary to accurately arrange the crushed portion in the direction in which the lateral pressure from the rotating shaft is received. Therefore, as shown in FIG. 8, when the sintered oil-impregnated bearing 2 is press-fitted into the bearing holder 1, the sintered oil-impregnated bearing 2 must be accurately aligned with the bearing holder 1. Conventionally, the above-mentioned alignment is performed by visually observing the crushed portion of the sintered oil-impregnated bearing 2 by an operator.

However, in practice, it is difficult to visually determine the crushed portion of the sintered oil-impregnated bearing, and the press-fitted position of the sintered oil-impregnated bearing with respect to the bearing holder often shifts. Further, it is impossible to automate the press-fitting process of the bearing because it requires visual judgment.

Therefore, the present invention provides a sintered oil-impregnated bearing in which the blind portions can be arranged easily and accurately in the direction in which the lateral pressure from the rotary shaft is received and the bearing press-fitting process can be easily automated. The purpose is to do.

(Means for Solving the Problems) In order to achieve the above object, the present invention is to mount a rotary shaft on an inner peripheral surface portion provided in a predetermined bearing holder and having a porous structure, In a sintered oil-impregnated bearing having a crushed portion formed by crushing more pores than other inner peripheral surface portions in a portion of the inner peripheral surface portion that receives a lateral pressure from the rotating shaft, a bearing holder is provided on at least one end surface in the axial direction. A guide groove for aligning the mounting position on the side is formed, and the guide groove is a position deviated from a portion communicating with the blind portion and has a predetermined positional relationship with the blind portion. There is.

(Operation) In the means having such a configuration, by disposing the guide groove of the bearing end face portion at a predetermined position, the crushed portion is also arranged at a predetermined position, and therefore the bearing holder Positioning of the bearing is facilitated. Further, at this time, since the guide groove can be automatically detected, the bearing press-fitting process can be easily realized by using the detection signal.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIG. 1, FIG. 2 and FIG. 3, the sintered oil-impregnated bearing 2 is formed in a hollow cylindrical shape, and an inner peripheral surface 3 thereof supports a rotary shaft (not shown). It is like this.

The inner peripheral surface 3 is provided with a porous material, and the porous material is provided with a predetermined graduation, and the degree of crushing of the porous material is changed in the circumferential direction. That is, the inner peripheral surface 3 is provided with a crushed portion 4 formed by crushing more than other portions over a circumferential range of a predetermined angle. This blindfold part 4
Are formed at two positions facing each other so as to receive lateral pressure from a rotary shaft (not shown), and the forming range of each of the blind portions 4 is set to about 60 °.

Further, guide grooves 6, 6 having a V-shaped cross section are formed on both end surfaces 5, 5 of the sintered oil-impregnated bearing 2 in the axial direction. Each of these guide grooves 6 linearly penetrates from the outer peripheral portion to the inner peripheral portion of the end surface 5 in the diametrical direction, and is arranged at a predetermined position deviated from the end surface portion communicating with the blind portion 4. .

Specifically, as shown in FIG. 2 in particular, the guide groove 6 and the blind portion 4 are arranged so as to be orthogonal to each other, and a center line 6a in the extending direction of the guide groove 6 is formed. Is set to be 90 ° with respect to a diameter line 4a passing through the center of the blind portion 4 in the circumferential direction.

The groove depth d of each guide groove 6 (see FIG. 1) is specifically
The groove width t is set to 0.4 mm and the groove width t is set to 1 mm.

Such a guide groove 6 is easily created by changing the punch shape of the molding die. That is, the end surface portion 11a of the ordinary forming punch 11 shown in FIGS. 9 (a) and 9 (b) is formed flat, whereas the end surface portion 11a of FIG. 4 (a), (b), (4) is formed. In the end face portion 21a of the forming punch 21 corresponding to the above-described embodiment shown in c), the protrusion 21 having a V-shaped cross section corresponding to the guide groove 6 is formed.
b is provided.

Returning to FIG. 1 to FIG. 3, both end surfaces of the sintered oil-impregnated bearing 2
Chamfers 7, 7 made of small taper surfaces are formed on the outer peripheral portions of 5, 5, respectively. The axial dimension c of each chamfer 7 is set to be slightly smaller than the groove depth d of the guide groove 6 (d <c).

As shown in FIG. 8, the sintered oil-impregnated bearing 2 in such an embodiment is press-fitted into both ends of the hole 1a of the bearing holder 1 having a predetermined shape, and the bearing holder 1
The sintered oil-impregnated bearing 2 is held at a predetermined position inside. The rotary shaft (not shown) is supported by the pair of sintered oil-impregnated bearings 2, 2.

When press-fitting the sintered oil-impregnated bearing 2 into the bearing holder 1,
The guide groove 6 of the sintered oil-impregnated bearing 2 is arranged at a predetermined position. As a result, the crushed portion 4 of the sintered oil-impregnated bearing 2 is also arranged at a predetermined position. Therefore, the sintered oil-impregnated bearing 2 is positioned with respect to the bearing holder 1, and the crushed portion 4 is subjected to the lateral pressure from the rotary shaft. Will be placed accurately.

Further, at this time, since the guide groove 6 can be automatically detected by a predetermined external detection device, the positioning work in the bearing press-fitting process can be automated based on the detection signal.

In this state where the sintered oil-impregnated bearing 2 is aligned, even if a large lateral pressure is applied to the sintered oil-impregnated bearing 2 from the rotary shaft, the rotary shaft is satisfactorily moved by the crushed portion 4 of the sintered oil-impregnated bearing 2. Supported. At this time, due to the large lateral pressure applied to the crushed portion 4 of the sintered oil-impregnated bearing 2, the oil film at that portion tries to escape to another portion. However, since the guide groove 6 in this embodiment is formed at a position away from the portion communicating with the blind portion 4, the oil film in the blind portion 4 does not flow out through the guide groove 6 to the outside.

Also, the sintered oil-impregnated bearing in the embodiment shown in FIG.
The guide groove 36 of 32 has a U-shaped cross section, and has a groove depth of 0.4 mm and a groove width of 1 mm, as in the first embodiment. Further, the guide groove 46 of the sintered oil-impregnated bearing 42 in the embodiment shown in FIG. 7 is formed in the shape of a round hole, and the guide groove 46 having a hemispherical cross section has a constant shape on both end surfaces 45, 45. Two diametrical lines are formed so as to face each other.

Even in such an embodiment, the same operation and effect as those of the first embodiment can be obtained.

(Effects of the Invention) As described above, according to the present invention, the guide groove having a predetermined positional relationship with the blind portion is formed on the bearing end surface at a position deviated from the portion communicating with the blind portion. When the sintered oil-impregnated bearing is mounted on, the sintered oil-impregnated bearing can be positioned easily and accurately with the guide groove as a reference, and the clogging part is accurately aligned in the direction of receiving the lateral pressure from the rotating shaft. Therefore, the bearing function can be favorably maintained. Further, since the guide groove can be automatically detected, the bearing press-fitting process can be easily automated by the detection signal.

[Brief description of drawings]

FIGS. 1, 2 and 3 are a semi-longitudinal sectional view, a plan view and an external perspective view showing a sintered oil-impregnated bearing according to an embodiment of the present invention, and FIGS. An explanatory plan view and a semi-longitudinal sectional view showing a punch for forming a sintered oil-impregnated bearing according to the present invention, and Fig. 5 is AA in Fig. 4 (a).
A line sectional view, FIG. 6 is a semi-longitudinal sectional view showing a sintered oil-impregnated bearing in another embodiment of the present invention, and FIGS. 7A and 7B are sintering in still another embodiment of the present invention. FIG. 8 is an explanatory plan view and an explanatory longitudinal sectional view showing an oil-impregnated bearing, FIG. 8 is an exploded perspective view showing a bearing mounting state of the bearing, and FIGS. 9 (a) and 9 (b) are general sintered oil-impregnated bearing moldings. It is the plane explanatory view and semi-longitudinal sectional view showing a punch. 1 …… Bearing holder, 2,32,42 …… Sintered oil-impregnated shaft, 4 ……
Blind part, 6,36,46 …… Guide groove.

Claims (1)

[Claims] 1. A sintered oil-impregnated bearing which is mounted in a predetermined bearing holder and supports a rotary shaft at an inner peripheral surface portion having a porous structure, wherein a lateral pressure from the rotary shaft is applied to the inner peripheral surface portion. In the receiving portion, a meshed portion formed by crushing the porous more than other inner peripheral surface portions is formed, and a guide groove for mounting position alignment with the bearing holder is formed on at least one end surface in the axial direction. The bearing holder is characterized in that the guide groove is provided at a position deviated from a portion communicating with the blind portion and has a predetermined positional relationship with the blind portion.