Assembly tooling for camshafts

Abstract

The invention discloses an assembly tool for a camshaft. The assembly tool comprises a base (5), supporting parts, a pressing part (2), a press-fitting part (3) and a power drive part (4), wherein the power drive part (4) is connected to one end of the base (5); the power output end of the power drive part (4) is connected to the press-fitting part (3); the press-fitting part (3) is in sliding connection to the base (5); the quantity of the supporting parts is multiple groups, wherein the supporting surfaces at the upper ends of one group of supporting parts are inner concave arc surfaces which are fitted with a selected reference surface, during design, of the cam shaft (1); the pressing surface of the pressing part (2) is an acting surface which abuts against a basic shaft surface (1-3) positioned on the end part of the cam shaft (1); and the part, below the pressing surface, is opposite to the supporting surface of the supporting part. After adopting the structure, a stress surface and the reference surface on the cam shaft are separated, so that stress balance of the whole cam shaft is guaranteed, and therefore, subsequent assembly and normal work of the assembly tool are guaranteed.

Description

technical field [0001] The invention relates to the technical field of camshafts, in particular to a camshaft assembly tool. Background technique [0002] The traditional manufacturing method of the camshaft is mainly integral forging or casting, and the cam and the shaft are integrated. Therefore, this kind of camshaft has the following disadvantages: due to the numerous machining processes behind the camshaft, the machining allowance is large, which will As a result, the entire camshaft is heavy and wastes a lot of material, making it inconvenient to manufacture. The assembled camshaft is more commonly used now, and its key technology is the connection method between the cam sleeve and the shaft. The existing manufacturing methods include steel pipe internal expansion method, internal hydraulic method, thermal sleeve method, powder metallurgy method and knurling connection method, etc. However, for some special camshafts, such as some exhaust camshafts, it needs to press...

AI Technical Summary

Problems solved by technology

[0002] The traditional manufacturing method of the camshaft is mainly integral forging or casting, and the cam and the shaft are integrated. Therefore, this kind of camshaft has the following disadvantages: due to the numerous machining processes behind the camshaft, the machining allowance is large, which will As a result, the entire camshaft is heavy and wastes a lot of materials, making it difficult to manufacture

However, for some special camshafts, such as some exhaust camshafts, it needs to press-fit some other irregular parts at the end of the camshaft, such as signal wheels, square cams, steel balls, etc. Therefore, this Compared with the traditional camshaft structure, the camshaft structure has a much more complex shape

If the traditional press-fitting tool is used, the problem it has is: since the datum plane of the camshaft is set at the design stage of the camshaft, in the traditional camshaft press-fitting tool, the cast belt The camshaft with multiple cams is placed on the bracket, and the pressing force is applied at the reference surface, so that the reference surface and the force-bearing surface are at the same position, in other words, before the press-fitting, the force is applied on the reference surface, The forces on the entire camshaft are balanced

However, the press-fitting of the above-mentioned irregular parts is usually carried out at the end of the camshaft. Therefore, after one end of the camshaft is stressed, the force is transmitted to the entire camshaft. Deviating angles are prone to occur, and these angular forces break the force balance of the entire camshaft, and except for the pressing force at the reference plane, other places are prone to deformation due to unbalanced forces. Once the camshaft The deformation will seriously affect its subsequent assembly and normal work. Therefore, the traditional press-fitting tooling is not suitable for the press-fitting of these camshafts with special parts.

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