Daido Metal Co.

Inuyama, Japan

Daido Metal Co.

Inuyama, Japan
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Patent
Daido Metal Co. | Date: 2017-05-31

There is provided a bearing apparatus of a crankshaft for an internal combustion engine that can promptly supply oil into a bearing clearance at start and can minimize the amount of oil supply during regular operation. The bearing apparatus (1) of a crankshaft for an internal combustion engine 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 (61) having a lubricating oil passage and a second journal portion (62) not having the lubricating oil passage. The first and second journal portions (61) and (62) are supported by the first and second main bearings (41) and (42). The bearing housing (8) includes an A1 alloy upper housing (81) and an Fe alloy lower housing (82). The groove depth (D2) of the oil groove (42G) of the upper half bearing (42U) of the second main bearing (42) is one half or less than the groove depth (D1) of the oil groove (4 1 G) of the upper half bearing (41U) of the first main bearing (41).


Patent
Daido Metal Co. | Date: 2016-11-22

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.


Patent
Daido Metal Co. | Date: 2016-11-28

A leveling plate including a main body and an end protrusion. The end protrusion is provided at both ends in a longer side direction of the main body, and protrudes from the main body in a thickness direction, the end protrusion having an end circumferential surface whose central axis extends in parallel with a shorter side direction of the main body.


Patent
Daido Metal Co. | Date: 2017-08-16

A sliding member (1) includes: a back metal layer (2); optionally a porous metal layer (6); and a sliding layer (3). The sliding layer includes: a synthetic resin matrix (4); graphite particles (5) dispersed in the matrix (4) having a volume ratio of 5-50 % of the sliding layer; optionally 1-20 volume % of one or more solid lubricants; and optionally 1-10 volume % of one or more fillers. The graphite particles are composed of spheroidal particle (51) and flake-like particles (52) having a volume ratio of 10-40 % of total graphite particles (5). The spheroidal particles have a cross-sectional structure with a plurality of AB planes laminated along a curved surface. The flake-like particles have a cross-sectional structure with the AB planes laminated in a thickness direction. The spheroidal particles have an average particle size of 3-50 m, and the flake-like particles have that of 1-25 m.


Patent
Daido Metal Co. | Date: 2016-08-25

The invention provides a bearing device, including a crankshaft, a pair of half bearings each having crush reliefs adjacent to both circumferential ends thereof, a bearing housing having a retaining hole, and one half thrust bearing arranged adjacent to the retaining hole. Each half thrust bearing is configured at least by a bearing alloy layer and a resin slide layer which constitutes a slide surface receiving an axial force of the crankshaft, and thrust reliefs adjacent to both circumferential end portions of the sliding surface so that its wall thickness is made thinner toward the circumferential end surface. A thrust relief length at an inner end portion of the thrust relief positioned on a rear side in the crankshaft rotational direction is formed to be larger than a thrust relief length at an inner end portion of the thrust relief positioned on a front side.


The invention provides a thrust bearing, including a pair of half thrust bearings. Each half thrust bearing includes a bearing alloy layer and a resin slide layer, or a back metal layer, a bearing alloy layer and a resin slide layer. The resin slide layer constitutes a slide surface receiving an axial force of a crankshaft. Each half thrust bearing include thrust reliefs formed adjacent to both circumferential end portions of the sliding surface so that a wall thickness is thinner toward the circumferential end surface. A thrust relief length at an inner end portion of the thrust relief positioned on a rear side of one of the half thrust bearings in a rotational direction is larger than a thrust relief length at an inner end portion of the thrust relief positioned on a front side of the other of the half thrust bearing in the rotational direction.


There is provided a half thrust bearing (8) having a semicircular-ring shape for a crankshaft of an internal combustion engine, including a back metal layer (84) and a bearing alloy layer (85) having a slide surface (81) on which thrust reliefs (82) are formed adjacently to both circumferential end surfaces (83) so that a wall thickness of the half thrust bearing becomes thinner from the slide surface toward the circumferential end surfaces. A thrust relief length (L1) of each thrust relief extends over a circumferential angle (1) from the circumferential end surface toward a circumferential central portion, and is constant between an inside end portion and an outside end portion in a radial direction of the half thrust bearing. A flat surface of each thrust relief includes a first region (86) on the circumferential end surface side and a second region (87) on the circumferential central portion side.


There is provided a half thrust bearing having a semicircular-ring shape for a crankshaft of an internal combustion engine, including a back metal layer and a bearing alloy layer having a slide surface on which thrust reliefs are formed adjacently to both circumferential end surfaces so that a wall thickness of the half thrust bearing becomes thinner from the slide surface toward the circumferential end surfaces. A thrust relief length L1 of each thrust relief extends over a circumferential angle 1 from the circumferential end surface toward a circumferential central portion, and is constant between an inside end portion and an outside end portion in a radial direction of the half thrust bearing. A flat surface of each thrust relief includes a first region on the circumferential end surface side and a second region on the circumferential central portion side.


Patent
Daido Metal Co. | Date: 2016-06-30

The present invention provides a half thrust bearing in a semicircular ring shape for receiving an axial force of the crankshaft of the internal combustion engine, that include a back metal layer, a bearing alloy layer and a resin slide layer, or a bearing alloy layer and a resin slide layer. The resin slide layer constitutes a slide surface receiving the axial force, and the half thrust bearing includes thrust reliefs formed on a side receiving the axial force and adjacent to both circumferential end portions thereof so that a wall thickness of the half thrust bearing becomes thinner toward the circumferential end portions. At least the thrust relief on a rear side in a rotational direction of the crankshaft has a thrust relief length which becomes larger toward an outer end portion from an inner end portion in a radial direction of the half thrust bearing.


Patent
Daido Metal Co. | Date: 2016-08-10

A main bearing (4) includes first and second half bearings (41, 42), each having a main cylinder portion and crush relief portions in both circumferential end portions. An oil groove (41a) 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.

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