Camshaft and manufacturing method thereof

Abstract

The invention provides a camshaft and a manufacturing method thereof. The camshaft comprises a mandrel, a cam and a transmission unit. The mandrel is provided with a shaft hole extending in the axialdirection. A matched section is arranged on the mandrel, and key teeth and key grooves are annularly and alternately arranged on the peripheral face of the matched section. The cam and the transmission unit sleeve the matched section of the mandrel, the inner circumferential face contours of the cam and the transmission unit are consistent with the peripheral face contour of the matched section, and the cam, the transmission unit and the mandrel are expanded and fixed. According to the camshaft and the manufacturing method thereof, when the mandrel is matched with the cam and the transmissionunit, precise positioning can be achieved, and the mandrel is fixedly connected with the cam and the transmission unit in an anti-rotation mode. The structure and manufacturing process of an existingcamshaft can be simplified, the time consumed by the camshaft manufacturing process can be shortened, cost can be reduced, and meanwhile large enough transfer torque is guaranteed.

Description

technical field [0001] The invention relates to the field of automobile engines, in particular to a camshaft and a manufacturing method thereof. Background technique [0002] The camshaft is one of the key transmission components of the automobile engine, which directly affects the performance of the engine. At present, the methods of manufacturing camshafts include: traditional integral casting method, forging method, and combined method of manufacturing camshafts. Among them, the use of casting and forging methods to manufacture camshafts has many disadvantages. For example, it is impossible to design and utilize the maximum performance of various parts of the camshaft, and the performance requirements of the cam, journal, mandrel, transmission unit, etc. It is very different. If a single material is used, the performance of each part cannot be maximized. The entire manufacturing process is complicated and requires a large number of mechanical processing procedures. The p...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a camshaft and its manufacturing method, which is used to solve the problem that the camshaft, the transmission unit and the mandrel cannot be accurately positioned during the production process of the camshaft in the prior art. problems and the problem of insufficient torsional strength after combination

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