JP5828265B2 - Plain bearing - Google Patents

Description

  The present invention relates to a sliding bearing, and more particularly to a sliding bearing having an oil hole.

Conventionally, a plain bearing provided with an oil hole is well known (for example, Patent Document 1). The oil hole is formed by bending a flat bearing material into a semi-cylindrical shape and then drilling a through hole with the punch or drill in the curved slide bearing material.
Then, the lubricating oil supplied from the outer peripheral surface side of the slide bearing is supplied to the inner peripheral surface side through the oil hole, and the lubricating oil is supplied to the rotating shaft pivotally supported by the inner peripheral surface. .

JP 2008-151297 A

In order to increase the amount of oil supplied and increase the cooling effect, it is desirable to increase the hole diameter (flow passage area). However, if the hole diameter is increased, the sliding area with the rotating shaft decreases. This is undesirable because it reduces the load capacity.
In other words, conventionally, there is a trade-off relationship between increasing the load capacity of the sliding bearing by the oil hole and enhancing the cooling effect, and it has been difficult to satisfy both at the same time.
In view of such circumstances, the present invention provides a slide bearing capable of simultaneously achieving an increase in load capacity and an increase in cooling effect of the slide bearing.

That is, the present invention is, e Bei the oil hole penetrating the outer circumferential surface and the inner circumferential surface of the sliding bearing which is supported in the housing, so that the lubricating oil is circulated to the inner peripheral surface from the outer surface side of the oil hole In the plain bearing
The oil hole is formed in an elliptical shape in which the axial direction of the plain bearing has a major axis, and is formed in a tapered shape that gradually expands from an opening on the inner peripheral surface side to an opening on the outer peripheral surface side. the opening area of the outer peripheral surface side of the oil hole is characterized in that it is set larger than the opening area of the inner peripheral surface side.

According to the above configuration, the oil hole has a tapered shape that gradually expands from the opening on the inner peripheral surface side to the opening on the outer peripheral surface side, and the opening area on the outer peripheral surface side is larger than the opening area on the inner peripheral surface side. Therefore, when compared with a conventional oil hole in which the opening area on the outer peripheral surface side is the same as the opening area on the inner peripheral surface side, the amount of lubricating oil supplied can be increased, thereby cooling capacity Can be increased.
On the other hand, when the amount of lubricating oil supplied is the same as that of the conventional product, the opening area on the inner peripheral surface side can be made smaller than that of the conventional product, so that the sliding area can be increased accordingly. Therefore, in this case, the load capacity of the slide bearing can be increased while keeping the cooling effect equal to that of the conventional product. Moreover, since the oil hole has an elliptical shape in which the axial direction of the slide bearing has a long diameter, the lubricating oil flowing out from the oil hole is easily supplied to both ends in the axial direction of the slide bearing. The load capacity can be increased.
As described above, according to the above configuration, either or both of the amount of oil supplied and the sliding area can be increased as compared with the conventional product. Therefore, depending on the setting method, the load capacity of the slide bearing can be increased. And increase in cooling effect can be achieved at the same time.

The side view which shows the Example of this invention. The top view of FIG. The expanded sectional view which follows the III-III line of FIG.

The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 and 2, the slide bearing 1 has a semi-cylindrical shape, and although not shown, both ends of the two slide bearings 1 are brought together to form a cylindrical shape. By doing so, a rotating shaft such as a crankshaft can be supported on the inner peripheral surface 1a.
The slide bearing 1 is provided with an oil hole 2, and the oil hole 2 is formed so as to penetrate the inner peripheral surface 1 a and the outer peripheral surface 1 b of the slide bearing 1.
In this embodiment, the oil hole 2 is formed in an elliptical shape (see FIG. 2) such that the axial direction of the slide bearing 1 has a long diameter, and as shown in FIG. The opening area Sb on the outer peripheral surface 1b side is set to be larger than the opening area Sa.
Such machining can be formed, for example, by moving the drill in the axial direction using a conical drill. The cone angle of the conical drill at this time, that is, the expansion angle of the oil hole 2 is preferably in the range of 5 to 30 degrees, and according to this, depending on the thickness of the slide bearing 1, the outer peripheral surface 1b side As for the size of the opening, the size of the ellipse in the major axis direction and the minor axis direction (sliding direction) may be about 0.1 to 0.3 mm larger than the opening on the inner peripheral surface 1a side. desirable. The elliptical oil hole 2 has a major axis that is about 1.5 times as large as the minor axis.

The sliding bearing 1 is supported by a housing 3 as shown in FIG. 3, and a lubricating oil passage 4 for supplying lubricating oil to the oil hole 2 is formed in the housing 3. The lubricating oil passage 4 is normally formed with a larger diameter than the oil hole 2, and in this way, a stepped portion 2 a is often formed at a continuous portion between the oil hole 2 and the lubricating oil passage 4.
In addition, although chamfering is given to each of the opening edge part on the inner peripheral surface 1a side of the oil hole 2 and the opening edge part on the outer peripheral surface 1b side, those chamfers are omitted in the drawing. .

In the above configuration, the lubricating oil supplied from the lubricating oil passage 4 flows through the oil hole 2 and is supplied to the inner peripheral surface 1 a of the slide bearing 1.
At this time, since the opening area Sb on the outer peripheral surface 1b side of the plain bearing 1 is larger than the opening area Sa on the inner peripheral surface 1a side, compared with the conventional product in which the opening areas Sa and Sb are set to be the same. Thus, the amount of oil supplied to the inner peripheral surface 1a of the slide bearing 1 can be increased.
Therefore, the cooling effect can be enhanced by increasing the amount of oil supplied compared to the conventional product. Since the opening area Sa on the inner peripheral surface 1a side is the same as that of the conventional product, the sliding area is not reduced, so that the load capacity of the slide bearing 1 can be prevented from being lowered.

In this embodiment, the amount of oil supplied to the inner peripheral surface 1a of the slide bearing 1 can be increased as compared with the conventional product. However, the oil supplied to the inner peripheral surface 1a of the slide bearing 1 is temporarily assumed. When the amount is the same as that of the conventional product, the opening area Sa on the inner peripheral surface 1a side can be made smaller than that of the conventional product.
In this case, since the sliding area can be increased as compared with the conventional product, the load capacity of the slide bearing 1 can be increased while keeping the cooling effect equivalent to that of the conventional product.
As described above, in this embodiment, the opening area Sb on the outer peripheral surface 1b side of the slide bearing 1 is set larger than the opening area Sa on the inner peripheral surface 1a side, so that the sizes thereof are set appropriately. Therefore, compared with the conventional product, either or both of the supply oil amount and the sliding area can be increased. Therefore, depending on the setting method, the load capacity of the slide bearing and the cooling effect are increased. Can be achieved at the same time.

Further, in the present embodiment, the oil hole 2 is formed in an elliptical shape so that the axial direction of the slide bearing 1 is the long axis, so that the oil hole 2 is compared with a round oil hole indicated by an imaginary line in FIG. Thus, both end portions on the long axis side of the oil hole 2 are close to both side portions 1c of the slide bearing 1.
As a result, the lubricating oil flowing out from the oil hole 2 is applied to both side portions 1c of the slide bearing 1 as shown by the solid line arrow in FIG. It becomes easy to be supplied.
The axis of a rotating shaft such as a crankshaft is not always rotated in a parallel state with respect to the inner peripheral surface 1a of the slide bearing 1, but is often rotated slightly tilted. A large load is applied to both side portions 1c of the slide bearing 1. However, since the lubricating oil flowing out from the oil hole 2 of the present embodiment is easily supplied to the both side portions 1c of the slide bearing 1, the load capacity of that portion can be increased.

Further, as described above, the stepped portion 2a is often formed in the continuous portion between the oil hole 2 and the lubricating oil passage 4, but in this embodiment, the opening area Sb on the outer peripheral surface 1b side of the slide bearing 1 is set to the inner periphery. Since the opening area Sa on the side of the surface 1a is set larger, the degree of the stepped portion 2a is made smaller than when both areas are set the same as in the oil hole shown by the imaginary line in FIG. Can do.
As a result, the flow of the lubricating oil flowing from the lubricating oil passage 4 to the oil hole 2 can be made relatively smooth to prevent pressure loss, and the oil is also supplied from the oil hole 2 to the inner peripheral surface 1a of the slide bearing 1. It is possible to increase the amount of lubricating oil supplied.

In addition, although not shown in figure , the said oil hole 2 may be connected to the oil groove formed in the internal peripheral surface 1a of the slide bearing 1 along the circumferential direction.

DESCRIPTION OF SYMBOLS 1 Slide bearing 1a Inner peripheral surface 1b Outer peripheral surface 1c Side part 2 Oil hole 2a Step part 3 Housing 4 Lubricating oil passage Sa, Sb Opening area

Claims (2)

E Bei the oil hole penetrating the outer circumferential surface and the inner circumferential surface of the sliding bearing which is supported in the housing, the sliding bearing lubricating oil from the outer peripheral surface of the oil holes to the inner peripheral surface is adapted to be circulated In
The oil hole is formed in an elliptical shape in which the axial direction of the plain bearing has a major axis, and is formed in a tapered shape that gradually expands from an opening on the inner peripheral surface side to an opening on the outer peripheral surface side. sliding bearings, characterized in that the opening area of the outer peripheral surface side is set larger than the opening area of the inner peripheral surface side of the oil hole. The sliding bearing according to claim 1 , wherein an angle at which the oil hole expands in a tapered shape is 5 to 30 degrees.

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