| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder head bolt fastening structure intended to obtain constantly generally fixed axial force after fastening.SOLUTION: Provided is a structure for fastening a cylinder head 1 to an engine case 2 that includes a cylinder 3 and a crankcase 4 by engaging a cylinder head bolt 8 inserted into the cylinder head 1 with the engine case 2. A flat washer 11 and a spring member 10 superimposed on the flat washer 11 and developing spring force in an axial direction are arranged between a rotation operation part 8a provided on a head 80 of the cylinder head bolt 8 and an upper surface of the cylinder head 1. Frictional resistance between the rotation operation part 8a of the cylinder head bolt 8 and the spring member 10 is set lower than those between the spring member 10 and the flat washer 11, and between the flat washer 11 and a bearing surface 1b of the cylinder head 1. |
