| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure supply device of an engine capable of simplifying a piping structure, and improving rigidity of a cylinder head.SOLUTION: A vacuum pump 3 is mounted on a cylinder head 1, and a cylinder head internal negative pressure passage 24 for communicating an inlet 15 connected to a pump inlet 27 of the vacuum pump 3 and negative pressure outlets 17, 18 connected to a negative pressure operation apparatus, is formed on a wall of the cylinder head 1. A pipe connecting portion 26 connected to the cylinder head internal negative pressure passage 24 and connecting the negative pressure outlets 17, 18 is disposed outside of a wall portion of the cylinder head 1. In a case when two connection holes 29 of which axes are orthogonal to one communication passage 28, are formed in a direction opposite to each other, ribs constituting outer walls of the communication passage 28 and the connection hole 29 are formed continuously to an outer side of the wall portion of the cylinder head 1, thus rigidity of the cylinder head 1 is improved. |
