JPS6115303Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a split type bearing.

For example, a split-type bearing as shown in FIG. 1 is used in the main bearing of an internal combustion engine. As shown in the figure, this bearing is composed of a bearing shell B that is cast integrally with a cylinder block A, and a bearing cap D that is tightened and fixed to this bearing shell B with bolts C. The bearing metal E is held by the bearing cap D and the bearing cap D. However, if the bearing cap D is made of aluminum alloy casting or the like in order to reduce the weight of the engine, for example, the desired strength cannot be obtained unless the volume is sufficiently increased, and the intended purpose cannot be achieved.

In addition, when assembling a bearing cap D made of aluminum alloy casting to a bearing shell B made of cast iron, the center of the tool shifts toward the soft bearing cap D side when machining the bearing hole, resulting in poor bearing center accuracy. may worsen.

This invention was made in view of the above, and
To provide a split-type bearing in which the bearing cap is made of a metal material that is lighter and softer than the bearing body, thereby reducing the weight of the bearing while maintaining sufficient strength and bearing accuracy, and in which the bearing hole is easily machined. purpose.

The present invention will be described below with reference to the embodiments shown in FIGS. 2 to 8.

In FIG. 2, the bearing shell 1 is connected to the cylinder block 2.
It is cast in one piece with cast iron. The bearing cap 4, which is tightened and fixed to the bearing shell 1 with bolts 3, is made of aluminum alloy casting, etc., but a cast iron liner is provided on its inner peripheral surface, that is, the part that is co-processed with the bearing shell 1. 5 is incorporated. A bearing metal 6 is held by the bearing shell 1 and the bearing cap 4.

That is, the main body of the bearing cap 4 is made of aluminum alloy casting to reduce its weight, and the bearing cap 4 is reinforced with a cast iron liner 5 cast into the inner peripheral surface of the cap 4. At the same time, the metal properties of the parts co-processed with the bearing shell 1 are made to be the same or similar to those of the bearing shell 1.

Therefore, since the strength of the bearing cap 4 is ensured without making it excessively large, it can be made lighter than a conventional bearing cap made only of cast iron. Additionally, a bearing cap 4 is co-processed with the bearing shell 1.
Since a liner 5 made of the same metal material as the bearing shell 1 is cast into the inner circumferential surface of the bearing shell 1, there is no risk that the center of the tool will shift toward the bearing cap 4 when machining the bearing hole, and the machining process will be smooth. High accuracy can be maintained.

When casting the liner 5, dovetail-shaped protrusions 5' are formed on the outer peripheral surface of the liner 5 as shown in FIG.
The liner 5 may be provided to maintain sufficient bonding strength between the liner 5 and the bearing cap 4, and as shown in FIG.
The strength of the cap 4 and the contact surface rigidity of the tightening surface may be increased by extending the cap 4.

Furthermore, the bearing cap 4 does not need to be constructed as a single unit; for example, when a large number of bearing caps are arranged in parallel at a predetermined interval, such as in the main bearing of an internal combustion engine, a ladder is used as shown in FIG. The liner 5 can be cast into each required location of the shaped bearing cap 4, or as shown in FIG. It may be improved.

As explained above, according to the split type bearing according to the present invention, the bearing cap is made of a metal material that is lighter than the bearing shell, and the inner peripheral surface of the liner is made of the same kind of metal material as the bearing shell. Since the liner is cast into the inner circumferential surface of the bearing cap in an exposed state, the liner not only reinforces the bearing cap, but also prevents the center of the tool from shifting during co-machining. Therefore, the weight of the bearing cap can be reduced while ensuring the strength of the bearing cap and the accuracy of hole machining, so that the weight of the split type bearing can be sufficiently reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional split-type bearing, FIG. 2 is a front view showing an example of a split-type bearing according to the present invention, and FIG. 3 is a sectional view taken along line A-A in FIG.
FIG. 4 is a perspective view of the bearing cap, FIG. 5 is a perspective view of the liner, FIG. 6 is a front view of another embodiment, and FIGS. 7 and 8 are perspective views showing modified examples of the bearing cap. . 1...bearing shell, 4...bearing cap, 5...liner, 6...bearing metal.

Claims (1)

[Scope of utility model registration request] In a split type bearing in which the bearing metal is held between the bearing shell and the bearing cap, the bearing cap is made of a metal material with a smaller specific gravity than the bearing shell, and the liner is made of the same type of metal material as the bearing shell. A split type bearing, characterized in that the inner circumferential surface thereof is cast into the inner circumferential surface of the bearing cap with the inner circumferential surface exposed.