# US 2010/0166351 A1 · Split-type sliding bearing for crankshaft in internal combustion engine and split-type sliding bearing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0166351 A1 - Document ID: US20100166351A1 - Status: Published application - Kind: A1 - Application number: 12/647,160 - Filed: 2009-12-24 - Published: 2010-07-01 - Earliest claimed: 2008-12-26 - Assignees: Daido Metal Company Ltd. - Inventors: Aisuke KUWABARA; Osamu Ishigo; Yasushi SAITO - Web page: https://patentgrep.com/patent/US20100166351A1 ## CPC - F16C 9/02: Crankshaft bearings - F16C 17/02: for radial load only - F16C 33/10: Construction relative to lubrication {(lubrication in general F16N)} - F16C 33/046: {divided or split, e.g. half-bearings or rolled sleeves} - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract Disclosed is a split-type sliding bearing for a crankshaft in an internal combustion engine, which is incorporated in a split-type bearing housing. The sliding bearing consists of a pair of semi-cylindrical bearing bodies (i.e. a first and a second semi-cylindrical bearing bodies) which are combined with each other to form a cylindrical body. The bearing housing has a cylindrical bearing retaining bore and consists of a pair of housing halves. One of the housing halves has a relatively lower stiffness, and the other has a relatively higher stiffness. The first bearing body is held by the housing half having a relatively lower stiffness. The second bearing body is held by the housing half having a relatively higher stiffness. The first and second bearing bodies have an equal outer diameter to each other, and both of the circumferential end parts of the first bearing body have a larger thickness than those of the second bearing body prior to incorporation into the housing halves. ## Claims ### Claim 1 A split-type sliding bearing for a crankshaft in an internal combustion engine, consisting of a pair of semi-cylindrical bearing bodies which are combined with each other to form a cylindrical body, and which are incorporated in a split-type bearing housing, having a cylindrical bearing retaining bore and consisting of a pair of housing halves each corresponding to the respective semi-cylindrical bearing body when the semi-cylindrical bearing bodies are incorporated in the cylindrical bearing retaining bore, wherein the split-type bearing housing consists of one housing half having a relatively lower stiffness, and another housing half having a relatively higher stiffness, wherein the former housing half supports one of the pair of semi-cylindrical bearing bodies, which is of a first semi-cylindrical bearing body, and the latter housing half supports the remainder of the pair of semi-cylindrical bearing bodies, which is of a second semi-cylindrical bearing body, and wherein the first and second semi-cylindrical bearing bodies have the following dimensional relationship before they are incorporated in the bearing housing consisting of the pair of the housing halves: (1) the first and second semi-cylindrical bearing bodies have an equal outer diameter, and (2) both of the circumferential end parts of the first semi-cylindrical bearing body have a larger thickness than those of the second semi-cylindrical bearing body, whereby the inner surfaces of the first and second semi-cylindrical bodies are in alignment with each other at those abutting circumferential end faces when the pair of housing halves are combined with each other by fastening bolts after the first and second semi-cylindrical bearing bodies are incorporated therein, even though differential steps arise between abutting end faces of the housing halves by a deformation difference between both of the housing halves due to a difference in stiffness. ### Claim 2 (depends on 1) The split-type sliding bearing according to claim 1, wherein the first semi-cylindrical bearing body has a uniform thickness throughout the entire circumferential length thereof. ### Claim 3 (depends on 1) The split-type sliding bearing according to claim 1, wherein the first semi-cylindrical bearing body has a thickness increasing from a circumferential midsection toward the abutting circumferential end faces of the first cylindrical bearing body. ### Claim 4 (depends on 1) The split-type sliding bearing according to claim 1, wherein the second semi-cylindrical bearing body has a uniform thickness throughout the entire circumferential length thereof. ### Claim 5 (depends on 1) The split-type sliding bearing according to claim 1, wherein the second cylindrical bearing body has a thickness decreasing from a circumferential midsection toward the abutting circumferential end faces of the second cylindrical bearing body. ### Claim 6 (depends on 1) The split-type sliding bearing according to claim 1, wherein at least the second semi-cylindrical bearing body is provided with a number of circumferential grooves formed on the inner surface of the second semi-cylindrical bearing body, and the circumferential grooves have a depth of from not less than 5 μm to not more than 20 μm in circumferential end regions including both circumferential ends. ### Claim 7 (depends on 6) The split-type sliding bearing according to claim 6, wherein each of the circumferential end regions in the inner surface of the second semi-cylindrical bearing body has a range defined by a circumferential length corresponding to a circumferential angle of at least 10° but up to 50°, which is measured from the respective circumferential end of the second semi-cylindrical bearing body as a starting point. ### Claim 8 (depends on 7) The split-type sliding bearing according to claim 7, wherein the inner surface of the second semi-cylindrical bearing body has a surface roughness of not more than 3.2 μm Rz except for the end regions each defined by the circumferential length corresponding to the circumferential angle. ### Claim 9 (depends on 6) A split-type sliding bearing according to claim 6, wherein the circumferential grooves in the second semi-cylindrical bearing body have a pitch of 0.3 mm to 1.5 mm. ### Claim 10 (depends on 6) The split-type sliding bearing according to claim 6, wherein a depth of the circumferential grooves formed in the inner surface of the second semi-cylindrical bearing body is not less than a size of differential steps occurred between the circumferential abutting end faces of the first and second semi-cylindrical bearing bodies. ### Claim 11 (depends on 6) A split-type sliding bearing according to claim 6, wherein the first semi-cylindrical bearing body is provided with a number of circumferential grooves formed on the inner surface of the first semi-cylindrical bearing body, and the circumferential grooves have a depth of from not less than 5 μm to not more than 20 μm in circumferential end regions including both circumferential ends. ### Claim 12 (depends on 11) The split-type sliding bearing according to claim 11, wherein each of the circumferential end regions in the inner surface of the first semi-cylindrical bearing body has a range defined by a circumferential length corresponding to a circumferential angle of at least 10° but up to 50°, which is measured from the respective circumferential end of the first semi-cylindrical bearing body as a starting point. ### Claim 13 (depends on 12) The split-type sliding bearing according to claim 12, wherein the inner surface of the first semi-cylindrical bearing body has a surface roughness of not more than 3.2 μm Rz except for the end regions each defined by the circumferential length corresponding to the circumferential angle. ### Claim 14 (depends on 11) The split-type sliding bearing according to claim 11, wherein the circumferential grooves in the first semi-cylindrical bearing body have a pitch of 0.3 mm to 1.5 mm. ### Claim 15 A split-type sliding bearing device for a crankshaft in an internal combustion engine, comprising: a split-type sliding bearing for a crankshaft in an internal combustion engine, consisting of a pair of semi-cylindrical bearing bodies which are combined with each other to form a cylindrical body, and a split-type bearing housing, having a cylindrical bearing retaining bore and consisting of a pair of housing halves each corresponding to the respective semi-cylindrical bearing body when the semi-cylindrical bearing bodies are incorporated in the cylindrical bearing retaining bore, wherein the split-type bearing housing consists of one housing half having a relatively lower stiffness, and another housing half having a relatively higher stiffness, wherein the former housing half supports one of the pair of semi-cylindrical bearing bodies, which is of a first semi-cylindrical bearing body, and the latter housing half supports the remainder of the pair of semi-cylindrical bearing bodies, which is of a second semi-cylindrical bearing body, and wherein the first and second semi-cylindrical bearing bodies have the following dimensional relationship before they are incorporated in the bearing housing consisting of the pair of the housing halves: (1) the first and second semi-cylindrical bearing bodies have an equal outer diameter, and (2) both of the circumferential end parts of the first semi-cylindrical bearing body have a larger thickness than those of the second semi-cylindrical bearing body, whereby the inner surfaces of the first and second semi-cylindrical bodies are in alignment with each other at those abutting circumferential end faces when the pair of housing halves are combined with each other by fastening bolts after the first and second semi-cylindrical bearing bodies are incorporated therein, even though differential steps arise between abutting end faces of the housing halves by a deformation difference between both of the housing halves due to a difference in stiffness. ### Claim 16 (depends on 15) The split-type sliding bearing device according to claim 15, wherein the first semi-cylindrical bearing body has a uniform thickness throughout the entire circumferential length thereof. ### Claim 17 (depends on 15) The split-type sliding bearing device according to claim 15, wherein the first semi-cylindrical bearing body has a thickness increasing from a circumferential midsection toward the abutting circumferential end faces of the first cylindrical bearing body. ### Claim 18 (depends on 15) The split-type sliding bearing device according to claim 15, wherein the second semi-cylindrical bearing body has a uniform thickness throughout the entire circumferential length thereof. ### Claim 19 (depends on 15) The split-type sliding bearing device according to claim 15, wherein the second cylindrical bearing body has a thickness decreasing from a circumferential midsection toward the abutting circumferential end faces of the second cylindrical bearing body. ### Claim 20 (depends on 15) The split-type sliding bearing device according to claim 15, wherein at least the second semi-cylindrical bearing body is provided with a number of circumferential grooves formed on the inner surface of the second semi-cylindrical bearing body, and the circumferential grooves have a depth of from not less than 5 μm to not more than 20 μm in circumferential end regions including both circumferential ends. ### Claim 21 (depends on 20) The split-type sliding bearing device according to claim 20, wherein each of the circumferential end regions in the inner surface of the second semi-cylindrical bearing body has a range defined by a circumferential length corresponding to a circumferential angle of at least 10° but up to 50°, which is measured from the respective circumferential end of the second semi-cylindrical bearing body as a starting point. ### Claim 22 (depends on 21) The split-type sliding bearing device according to claim 21, wherein the inner surface of the second semi-cylindrical bearing body has a surface roughness of not more than 3.2 μm Rz except for the end regions each defined by the circumferential length corresponding to the circumferential angle. ### Claim 23 (depends on 20) The split-type sliding bearing device according to claim 20, wherein the circumferential grooves in the second semi-cylindrical bearing body have a pitch of 0.3 mm to 1.5 mm. ### Claim 24 (depends on 20) The split-type sliding bearing device according to claim 20, wherein a depth of the circumferential grooves formed in the inner surface of the second semi-cylindrical bearing body is not less than a size of differential steps occurred between the circumferential abutting end faces of the first and second semi-cylindrical bearing bodies. ### Claim 25 (depends on 20) The split-type sliding bearing device according to claim 20, wherein the first semi-cylindrical bearing body is provided with a number of circumferential grooves formed on the inner surface of the first semi-cylindrical bearing body, and the circumferential grooves have a depth of from not less than 5 μm to not more than 20 μm in circumferential end regions including both circumferential ends. ### Claim 26 (depends on 25) The split-type sliding bearing device according to claim 25, wherein each of the circumferential end regions in the inner surface of the first semi-cylindrical bearing body has a range defined by a circumferential length corresponding to a circumferential angle of at least 10° but up to 50°, which is measured from the respective circumferential end of the first semi-cylindrical bearing body as a starting point. ### Claim 27 (depends on 26) The split-type sliding bearing according to claim 26, wherein the inner surface of the first semi-cylindrical bearing body has a surface roughness of not more than 3.2 μm Rz except for the end regions each defined by the circumferential length corresponding to the circumferential angle. ### Claim 28 (depends on 25) The split-type sliding bearing device according to claim 25, wherein the circumferential grooves in the first semi-cylindrical bearing body have a pitch of 0.3 mm to 1.5 mm.