| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a booming noise in a cabin of a vehicle to eliminate unpleasant feeling to an occupant, by simple structure. SOLUTION: A stepped part 1 is formed in a junction part 4 for joining a rear end part of a roof panel 8 of a cab 7 and an upper edge of a back panel 9. The first spot welding part 6a and the second spot welding part 6b are driven respectively in the first junction 4a and the second junction 4b to fix the roof panel 8 and the back panel 9, and the stepped part 1 is provided in the junction part 4 to enhance rigidity of the junction part 4. A vibration mode of the back panel 9 around the junction part 4 as a base point is varied to reduce or eliminate the booming noise as a result thereof. |
