ND_2型内燃机车的柴油机气缸头中部,安装喷油嘴处镶有紫铜套管,以便通过冷却水腔的循环水带走该部位的热量。为了保证由紫铜套管和气缸头体组成的冷却水腔的严格密封,在气缸头体与紫铜套管接触的上下两个圆柱面上,各设两条槽,并要求紫铜套管经挤压后能与槽形密贴镶嵌(参阅图1)。 In the middle of the diesel engine cylinder head of an ND 2 diesel locomotive, a copper sleeve is installed at the fuel injection nozzle so as to take away the heat of the site through the circulating water in the cooling water chamber. In order to ensure the tight seal of the cooling water chamber composed of the copper sleeve and the cylinder head body, two grooves are respectively arranged on the upper and lower two cylindrical surfaces of the cylinder head body in contact with the copper sleeve, and the copper sleeve is required to be extruded After the groove can be inlaid with mosaic (see Figure 1).