Cylinder head and engine

1. A cylinder head of an engine, comprising:

an exhaust port configured to lead out exhaust gas from combustion chamber;

an intake port configured to introduce fresh air into the combustion chamber; and

an EGR gas passage in which EGR gas flows,

wherein exhaust outlets of the exhaust port and an EGR gas inlet of the EGR gas passage are located on a first side surface of the cylinder head and,

a fresh air inlet communicated to the intake port and an EGR gas outlet of the EGR gas passage are located on a second side surface which is a side opposite to the first side surface.

2. The cylinder head of an engine according to claim 1 ,

wherein the first side surface and the second side surface are flat,

the exhaust outlets of the exhaust port and the EGR gas inlet of the EGR gas passage are arranged side-by-side on the first side surface of the cylinder head and,

the fresh air inlet and the EGR gas outlet of the EGR gas passage are arranged side-by-side on the second side surface.

3. The cylinder head of an engine according to claim 1 , further comprising:

a cooling water passage provided inside the cylinder head,

a cooling water outlet defined as an opening and formed at an upper surface of the cylinder head.

4. The cylinder head according to claim 3 , further comprising:

a water jacket configured to cool the combustion chamber with cooling water,

wherein the cooling water outlet pipe communicates with the water jacket.