# US 2017/0284530 A1 · Sprocket structure of engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0284530 A1 - Document ID: US20170284530A1 - Status: Published application - Kind: A1 - Application number: 15/285,220 - Filed: 2016-10-04 - Published: 2017-10-05 - Earliest claimed: 2016-03-29 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Jae Kyun Lee; Jae Kyu Lee - Web page: https://patentgrep.com/patent/US20170284530A1 ## CPC - F16H 55/12: with body or rim assembled out of detachable parts - F01L 1/02: Valve drive (transmitting-gear between valve drive and valve F01L1/12) - F01L 1/024: {Belt drive} - F02B 67/06: driven by means of chains, belts, or like endless members - F16H 7/023: {with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley} - F16H 9/26: with members having orbital motion - F16H 55/171: {Toothed belt pulleys} - F16H 55/566: {only adjustable when pulley is stationary} - F16H: GEARING - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) ## Abstract The present disclosure provides a sprocket structure of an engine including a crank sprocket provided in a cylinder block of an engine and driven by a crank shaft, a high pressure pump sprocket configured to receive rotational force from the crank sprocket through a timing belt, and a cam sprocket having an interior installed on a camshaft and an exterior rotatably coupled to the timing belt so as to be driven. Since a tensioner is fixed in a state in which tension is applied to the timing belt through jigs of the crank sprocket and the high pressure pump sprocket and the cam sprocket having a dual-structure, loss of tension is reduced, thus minimizing occurrence of an error of the timing belt to enhance quality of a product. ## Claims ### Claim 1 A sprocket structure of an engine, the sprocket structure comprising: a crank sprocket provided in a cylinder block of the engine and driven by a crank shaft; a high pressure pump sprocket configured to receive rotational force from the crank sprocket through a timing belt; and a cam sprocket having an inner sprocket installed on a camshaft and an outer sprocket rotatably coupled to the timing belt so as to be driven. ### Claim 2 (depends on 1) The sprocket structure according to claim 1, wherein the cam sprocket includes: the outer sprocket formed on an outer side of the cam sprocket and provided to be freely rotated by the timing belt; and the inner sprocket provided on an inner side of the outer sprocket and directly connected to the camshaft to fix timing, wherein the cam sprocket applies tension to the timing belt. ### Claim 3 (depends on 1) The sprocket structure according to claim 1, wherein the crank sprocket includes a crank jig inserted into the center thereof to fix a position of the crank sprocket with respect to the crank shaft and to rotate the crank sprocket. ### Claim 4 (depends on 1) The sprocket structure according to claim 1, wherein the high pressure pump sprocket includes a high pressure pump jig inserted into the center thereof to fix a position of the high pressure pump sprocket with respect to a shaft of a high pressure pump configured to rotate the high pressure pump sprocket. ### Claim 5 (depends on 2) The sprocket structure according to claim 2, wherein the inner sprocket is fastened to the outer sprocket by a bolt. ### Claim 6 (depends on 5) The sprocket structure according to claim 5, wherein a plurality of fastening portions are formed on an inner circumferential surface of the outer sprocket to which the inner sprocket is fastened and fixed by the bolt. ### Claim 7 (depends on 2) The sprocket structure according to claim 2, wherein a coupling hole is formed at a center of the inner sprocket to which the camshaft is fixed and coupled. ### Claim 8 (depends on 1) The sprocket structure according to claim 1, wherein a plurality of tensioners fixing tension are provided on an outer side of the timing belt. ### Claim 9 A sprocket structure of an engine, the sprocket structure comprising: a crank sprocket provided in a cylinder block of the engine, driven by a crankshaft, the crank sprocket having a crank jig inserted into a center thereof to fix the crankshaft and to allow only an outer portion of the crank sprocket to be rotated; a high pressure pump sprocket configured to receive rotational force from the crank sprocket through a timing belt, the high pressure pump sprocket having a high pressure pump jig inserted into a center thereof to fix a shaft of a high pressure pump to allow only an outer portion of the high pressure pump sprocket to be rotated; and a cam sprocket having an outer sprocket formed on an outer side of the cam sprocket and that is freely rotated by the timing belt and an inner sprocket provided within the outer sprocket and directly connected to a camshaft to fix timing and to apply tension to the timing belt. ### Claim 10 (depends on 9) The sprocket structure according to claim 9, wherein a plurality of fastening portions are formed on an inner circumferential surface of the outer sprocket to which the inner sprocket is fastened and fixed by a bolt, and wherein a coupling hole is formed at a center of the inner sprocket to which the camshaft is fixed and coupled.