Analysis of Spline Driven Gear Shaft Forgings

Analysis of spline driven gear shaft forgings

Core Tip: 1. The material requirements show the forging diagram of the spline driving gear in a certain 9O motorcycle gearbox. The forging material is required to be 20CrMo alloy structural steel, with the national standard of GB3077, and its main chemical composition.

1. The material requirements show the forging diagram of the spline driving gear in a certain 9O motorcycle gearbox. The forging material is required to be 20CrMo alloy structural steel, with a national standard of GB3077 and its main chemical composition.

2. The geometric shape can be seen from the middle that it consists of three parts. The upper part consists of three convex blocks with approximately circular fan-shaped cross-sections and two semicircles, the middle part is a symmetrical cylindrical stepped body, and the lower part consists of four convex blocks with approximately circular fan-shaped cross-sections. Among them, the forming of the upper and lower convex blocks and the stability of the process are the key and difficult points in the design of forming technology.

3. The dimensional accuracy of gear forgings requires that any unspecified dimensional tolerances be calculated according to IT13 level. At the same time, it is required that, except for the outer diameter of 42mm and the length of the protrusions in the upper and lower parts that need to be forged and cut, the dimensions and shapes of all other parts are non machined mating surfaces, and no slope is allowed. This has become one of the key points in the design of forging process technology.