Combined type hollow camshaft and machining process thereof

Abstract

The invention discloses a combined type hollow camshaft. The combined type hollow camshaft comprises a camshaft body, a combined type cam and a signal wheel, wherein the combined type cam and the signal wheel are arranged on the camshaft body. The combined type cam and the signal wheel are provided with assembly holes used for being formed in the camshaft body. The camshaft body is fixedly connected with a cam base circle part of the combined type cam and a tooth missing part of the signal wheel through pin structures. A machining process comprises the following steps that the hollow camshaft body is cast; a blind hole is machined in a corresponding shaft neck of a fastening cam on the camshaft body, a step hole corresponding to the blind hole in the camshaft body is machined in the combined type cam, and a cam rivet is pressed into the corresponding holes in the combined type cam and the camshaft body; a fixed hole is machined in the tooth missing part of the signal wheel, and a blind hole corresponding to the fixed hole is machined in the camshaft body; and a conical pin is pressed into the fixed hole of the signal wheel and the blind hole corresponding to the fixed hole. The machining process difficulty and cost are reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a combined hollow camshaft and its processing technology. Background technique [0002] The engine valve mechanism is one of the core moving mechanisms of the engine; the camshaft is one of the core components of the engine valve mechanism, and the camshaft is the power source for the movement of the components of the valve mechanism. [0003] At present, there are two main types of camshafts on the market: cast camshafts and combined camshafts; cast camshafts are widely used and relatively cheap, but the disadvantages are heavy weight, insufficient cam strength and complicated production process; combined camshafts Shaft, the advantages are light weight, reasonable selection of materials, etc., but the disadvantage is that the cost is high, and the current signal wheel generally adopts the direct press-fit interference fit method, and the press-fit angle of the signal wheel cann...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main types of camshafts on the market: cast camshafts and combined camshafts; cast camshafts are widely used and relatively cheap, but the disadvantages are heavy weight, insufficient cam strength and complicated production process; combined camshafts Shaft, the advantages are light weight, reasonable selection of materials, etc. The disadvantage is that the cost is high, and the current signal wheel generally adopts the direct press-fit interference fit method, and the press-fit angle of the signal wheel cannot be well controlled.

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