Daido Metal Company Ltd.

Atsushi Okado

Osamu Ishigo

Masaaki Sakamoto

Arihiro Kimura

Keiko Kitahara, Legal Representative

Tomohiro Ukai

Koji Kuroda

Katsumi Asai

Disclosed is a sliding bearing for an internal combustion engine for supporting a crankshaft including a pair of semi-cylindrical bearings combined with each other into a cylindrical body. Each of inner circumferential surfaces of the respective semi-cylindrical bearings includes first and second curved surfaces following two kinds of arcs with different curvatures. The first curved surface is in a region including a circumferential central portion of the inner circumferential surface. The second curved surfaces are in remaining two regions of the inner circumferential surface. The circumferential oil groove and the axial groove communicate with each other. The circumferential grooves of the second curved surfaces and the axial groove communicate with each other. The groove bottoms of the circumferential grooves of the second curved surfaces are displaced to a side of the bearing inner circumferential surface from a groove bottom of the axial groove.

Sliding bearing for internal combustion engine

A connecting rod bearing in which a semi-cylindrical bearing has an inner circumferential groove that extends from an abutting end with respect to another semi-cylindrical bearing toward a circumferential center part of the semi-cylindrical bearing, and is in alignment with an outlet port of a lubricant oil passage, the abutting end being oriented toward the same direction as a direction of relative rotation of the crankpin with respect to the connecting rod bearing. The dimension are sized such that the connecting rod bearing is capable of preventing large size foreign substances from entering into the clearance defined along the inner surface of the connecting rod bearing even though foreign substances, accompanied in the lubricant oil which is fed to the connecting rod bearing from a cylinder block of an internal combustion engine through the journal portion of a crankshaft, is not caused to discharge from the connecting rod bearing.

Connecting rod bearing in internal combustion engine

Disclosed is a sliding bearing consisting of a pair of semi-cylindrical bearings for supporting a crankshaft or a crank pin in an internal combustion engine. The sliding bearing is incorporated in a split-type bearing housing. One of the semi-cylindrical bearings being incorporated in at least one of the pair of housing halves, which one housing half has a relatively higher stiffness, is provided with a number of circumferential grooves on an inner surface of the semi-cylindrical bearing so as to extend circumferentially along the inner surface of the semi-cylindrical bearing. The circumferential grooves existing at least one circumferential end region of the inner surface of the semi-cylindrical bearing have a depth of not less than 10 &#x3bc;m, the circumferential end region including a circumferential bearing end face orientating a direction opposite to the rotation direction of the shaft or pin.

Sliding bearing for internal combustion engine and sliding bearing device

A connecting rod bearing is constituted of a pair of semi-cylindrical bearings I and II. In a state in which the semi-cylindrical bearings are assembled into a cylindrical shape, along two contact surfaces C of circumferential end surfaces, first axial oil grooves E are formed to be located at a central portion in a bearing width direction, and second axial oil grooves F are formed to be located at both sides in the bearing width direction of each of the first axial oil grooves E. One of the first axial oil grooves E and two of the second axial oil grooves F are in relation to communicate with each other. The first axial oil groove E is formed in the range of the wall thickness decreasing region surface A.

Bearing for connecting rod of internal combustion engine

Disclosed is a connecting rod bearing for crankshafts having a pair of semi-cylindrical bearings. Circumferential grooves (CG) on the bearing inner surface extend from each circumferential end toward the circumferential center within a maximum circumferential angle of 45 degrees and divide reduced wall thickness region into two sections. Axial grooves communicating with the CG are provided along abutted ends of the bearings. Circumferential length of the CG is larger than that of the reduced region. Depth of the CG becomes gradually smaller from the end toward the center. Width of the CG is not smaller than one-quarter of a diameter of lubricant-oil outlet of internal lubricant-oil passage in a crankpin and less than the diameter. Cross-sectional area of the CG is larger than that of the axial grooves at a connection portion thereof.

Connecting rod bearing for internal combustion engines and connecting rod bearing device

A sliding bearing has a pair of semi-cylindrical bearings assembled together to form a cylindrical configuration. At least one of the semi-cylindrical bearings is provided with an inner surface circumferentially extending oil groove extending a central portion of the circumferential length of the semi-cylindrical bearing. A bottom surface of the oil groove has an ups and downs form consisting of a plurality of ridges and valleys, which sinusoidally undulate consecutively without a flat portion therebetween. The dimensional relationship between a typical ridge and the adjacent valleys is defined by the formula h&#x3c;0.15H where H indicates the groove depth and h indicates an elevation difference of the ups and downs of the bottom surface, namely a height of the ridges where h is preferably not less than 10 &#x3bc;m.

Sliding bearing for internal combustion engines

There is provided a sliding bearing, which can continuously enhance conformability even when deformation by high oil film pressure in the vicinity of a central part of the sliding bearing occurs. The sliding bearing includes crownings which are each formed in an inclined shape toward an outer peripheral surface from an inner peripheral surface, at end parts in an axial direction, of an inner peripheral surface of a sliding bearing, so that even when the region in the vicinity of the central part of the sliding bearingreceives the oil film pressure and deforms in the recessed shape so as for both the end parts in the axial direction to locally contact a shaft, conformability can be enhanced not only at an early stage of use of the sliding bearing but also continuously by relief by the crownings.

Sliding bearing

A plain bearing comprising a housing and two plain bearing halves forming a cylindrical shape in combination and fixed in the housing. Each of the plain bearing halves has crush reliefs formed at both ends of an inner circumferential surface thereof in a circumferential direction, an oil groove formed on the inner circumferential surface thereof and extending in the circumferential direction, a central crown portion at substantially central position in the circumferential direction and in communication with the oil groove, and inflow preventing portions formed between the crush reliefs and the oil groove.

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Inuyama, Japan

Atsushi Okado