# US 2012/0073533 A1 · Camshaft device, engine with same, and method for manufacturing camshaft device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2012/0073533 A1 - Document ID: US20120073533A1 - Status: Published application - Kind: A1 - Application number: 13/322,493 - Filed: 2010-05-19 - Published: 2012-03-29 - Earliest claimed: 2009-06-18 - Assignees: Jtekt Corporation - Inventors: Kazuki Hamada; Hiroshi Ueno; Isao Usuki; Kunio Yanai; Hironori Hiraoka; Kotaro Yamashita; Hiroshi Satou; Takaaki Ikeda; Ryo Oonishi - Web page: https://patentgrep.com/patent/US20120073533A1 ## CPC - F01L 1/053: overhead type - F01L 2001/0476: {Camshaft bearings} - F01L 2001/0537: {Double overhead camshafts [DOHC]} - Y10T 29/49293: Camshaft making - Y10T 74/2101: Cams - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A camshaft device (10) includes a camshaft (11) onto which a cam (18) is fitted; a plurality of rolling bearings (12) that are fitted at intervals in an axial direction onto this camshaft (11); and a support frame (13) that is mounted on a cylinder head (15) of an engine, and that has a plurality of bearing holes (25) which are formed on the same axis and into which the rolling bearings (12) fitted, and that rotatably supports the camshaft (11) via the rolling bearings (12) that are fitted into the bearing holes (25). The support frame (13) is formed by connecting a plurality of split bodies (27), (28) together, and the plurality of split bodies (27), (28) includes a first split body (27) on which a plurality of first concave portions (29) that form half of the bearing holes (25) is integrally formed, and a second split body (28) on which a plurality of second concave portions (30) that form the other half of the bearing holes (25) is integrally formed. ## Claims ### Claim 1 A camshaft device comprising: a camshaft onto which a cam is fitted; a plurality of rolling bearings that are fitted at intervals in an axial direction onto this camshaft; and a support frame that is mounted on a cylinder head of an engine, and that has a plurality of bearing holes which are formed on a same axis and into which the rolling bearings are fitted, and that rotatably supports the camshaft via the rolling bearings that are fitted into the bearing holes, wherein the support frame is formed by connecting a plurality of split bodies together; and the plurality of split bodies includes a first split body on which a plurality of first concave portions that form half of the bearing holes is integrally formed, and a second split body on which a plurality of second concave portions that form the other half of the bearing holes is integrally formed. ### Claim 2 (depends on 1) The camshaft device according to claim 1, comprising: positioning means for positioning the first split body and the second split body such that the first concave portions and the second concave portions are aligned with each other; and a plurality of connecting means for connecting together the first split body and the second split body that are positioned by the positioning means. ### Claim 3 (depends on 2) The camshaft device according to claim 2, wherein at least one or all of the plurality of connecting means are arranged in positions that are away in the axial direction from the bearing holes. ### Claim 4 (depends on 2) The camshaft device according to claim 2, wherein: the connecting means includes a bolt; a bolt inserting hole into which the bolt is inserted is formed in the support frame; and a tubular body that is more rigid than the support frame and that receives at least a portion of fastening power of the bolt is fixed inside this bolt inserting hole. ### Claim 5 (depends on 1) The camshaft device according to claim 1, wherein: the support frame has a pair of side wall portions arranged along an axis of the camshaft with the camshaft interposed therebetween, and a plurality of support wall portions that are extended between the pair of side wall portions, and that are arranged at intervals in the axial direction of the camshaft; and the bearing holes are formed in the support wall portions. ### Claim 6 (depends on 5) The camshaft device according to claim 5, wherein: connecting means for connecting the first and second split bodies together are provided in the side wall portions; and material removed portions that reduce rigidity of the support frame are formed between the connecting means and the bearing holes. ### Claim 7 (depends on 1) The camshaft device according to claim 1, wherein the support frame is split into upper and lower portions. ### Claim 8 (depends on 1) The camshaft device according to claim 1, wherein the support frame is split into portions in a lateral direction. ### Claim 9 (depends on 1) An engine in which the camshaft device according to claim 1 is connected to an upper surface portion of a cylinder case. ### Claim 10 (depends on 1) A method for manufacturing the camshaft device according to claim 1, comprising: a step of temporarily fitting together the positioned first split body and second split body on which the first and second concave portions, respectively, have not been formed; a step of forming the plurality of bearing holes, on a same axis, in the temporarily fitted first split body and second split body; and a step of, after separating the first and second split bodies, repositioning and connecting the first and second split bodies while fitting the rolling bearings that are fitted on the camshaft into the first and second concave portions formed in the first and second split bodies, respectively.