ISO 2974:2013 pdf free
ISO 2974:2013 pdf free.Diesel engines一60 degree female cones for high-pressure fuel injection components
The following figures indicate the requirements for the 60° female cones at fuel injectors, CR-injectors,fuel injection pumps, high-pressure supply pumps, and rails to allow interchangeability for high-pressure fuel injection pipe assemblies according to ISO 13296:
一Figures 1, 2, 3, and 4 for integral female cones;
一Figures 5, 6, and 7 for fabricated female cones.
The 60° female cone and its relationship to the external thread shall meet the requirements of Figure 1 (integral female cones) or Figure 5 (fabricated female cones). However, for integral female cones,variations at the smaller end of the female cone as shown in Figure 3 are acceptable.
Dimensions and tolerances are given in Table 1 (integral female cones) and Table 2 (fabricated female cones). Unspecified details are left to the manufacturer’s choice.
With reference dimension T in Figures 1, 2, 5, and 6, the external thread may be either with or without undercut. However, it shall be possible to screw the GO-gauge for the thread up to the plane specified by dimension T.
Figure 4 and Figure 7 show the assemblies with pipe end connections for the integral and fabricated female cone types, respectively.
The specification of material and heat treatment shall be made according to the intended use. To ensure tightness of the joint between the connection end of the high-pressure pipe and the female cone of the mating part of pump, injector, or rail for the initial assembly as well as for repeated assemblies, the necessary plastic deformation shall take place at the sealing face of the high-pressure pipe.
For this purpose, the minimum hardness of the female cone should be a minimum of 50HV harder than the maximum hardness of the pipe connection end. However, it shall be proven that the pipe sealing cone with its plastic deformation caused by assembly, in combination with the minimum preload, ensures the tightness of the joint for the initial and repeated assembly processes over the product’s useful life.ISO 2974 pdf download.
