Daido Metal Company Ltd.

Kenta Kato

Yuki Kawashima

Takeharu Yamamoto

Osamu Ishigo

Yasushi Saito

Masahiro Hirayama

There is provided a bearing apparatus of a crankshaft for an internal combustion engine. The bearing apparatus includes a crankshaft having a plurality of journal portions and a plurality of crank pin portions; a main bearing supporting the crankshaft; and a bearing housing holding the main bearing. The plurality of journal portions include a first journal portion having a lubricating oil passage and a second journal portion not having the lubricating oil passage. The first and second journal portions and are supported by the first and second main bearings and. The bearing housing includes an Al alloy upper housing and an Fe alloy lower housing. The groove depth of the oil groove of the upper half bearing of the second main bearing is one half or less than the groove depth of the oil groove of the upper half bearing of the first main bearing.

Bearing apparatus of crankshaft for internal combustion engine

A main bearing includes first and second half bearings, each having a main cylinder portion and crush relief portions in both circumferential end portions. An oil groove circumferentially extends on an inner circumferential surface only of the first half bearing, one circumferential end portion of the oil groove opens on a circumferential end surface on a front side in a rotation direction, and the other circumferential end portion of the oil groove is positioned in the crush relief portion on a rear side in the rotation direction. The first half bearing includes a transition region between the crush relief portion on the front side in the rotation direction and the main cylinder portion, and the second half bearing includes a transition region between the crush relief portion on the rear side in the rotation direction and the main cylinder portion.

Main bearing for crankshaft of internal combustion engine

A main bearing includes first and second half bearings, each having a main cylinder portion and crush relief portions in both circumferential end portions. An oil groove circumferentially extends on an inner circumferential surface only of the first half bearing, one circumferential end portion of the oil groove opens on a circumferential end surface on a front side in a rotation direction, and the other circumferential end portion of the oil groove is positioned in the main cylinder portion. The first half bearing includes a transition region at least between the crush relief portion on the rear side in the rotation direction and the main cylinder portion, and the second half bearing includes a transition region at least between the crush relief portion on the front side in the rotation direction and the main cylinder portion.

A bearing device includes: a journal part, a main bearing, a cylinder block, and a bearing cap. One half bearing held by the cylinder block includes: a first circumferential oil groove and a second circumferential oil groove being formed at positions opposite to an inlet of an oil passage of the journal part; a separation part separating the first circumferential oil groove and the second circumferential oil groove; and an oil hole penetrating from the first circumferential oil groove to an outer circumferential surface. A length L1 in a circumferential direction of the separation part at a position in the inner circumferential surface of the one half bearing is smaller than a length L2 in the circumferential direction of the inlet of the journal part.

Bearing device

A bearing device includes: a journal part, a main bearing, a cylinder block, and a bearing cap. One half bearing held by the cylinder block includes: a first circumferential oil groove and a second circumferential oil groove being formed at positions opposite to an inlet of an oil passage of the journal part; a separation part separating the first circumferential oil groove and the second circumferential oil groove; and a first oil hole and a second oil hole respectively penetrating from the first circumferential oil groove and the second circumferential oil groove to an outer circumferential surface. The cylinder block includes an oil distribution passage which is formed so as to extend across both the first oil hole and the second oil hole of the one half bearing.

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Inuyama, Japan

Kenta Kato