Timing case for a cylinder head of internal combustion engines h

Details Timing case for a cylinder head of internal combustion engines h Timing case for a cylinder head of internal combustion engines h

1986-06-12

1987-12-08

Feinberg, Craig A.

Internal-combustion engines

Poppet valve operating mechanism

Lubrication

123 906, 123193H, 123196R, F01M 106

Patent

active

047112034

DESCRIPTION:

BRIEF SUMMARY
This invention is based on DE-C No. 23 42 530 wherein a timing case is provided for a cylinder head of an internal combustion engine having gas changing valves arranged essentially in parallel to one another that are actuated by separate cams on a joint cam shaft disposed in the timing case, by way of tappets that are guided in breakthroughs of the timing case, said breakthroughs being arranged adjacently while leaving a web, and the web, on the side of the cam shaft, being connected with the bottom part of a divided cam shaft bearing, the width of the cam shaft bearing, in the area of the smallest wall thickness of the web, exceeding the smallest wall thickness.
In the case of this known construction, the timing case is constructed in one piece with the cylinder head. In the case of this cylinder head, also at least two identical parallel gas changing valves are provided. The relatively short mutual distance of the parallel valves, on the one hand, and the endeavor provide to relatively large diameters for the bucket tappets, on the other hand, results in a relatively narrow web between the adjacent breakthroughs for guiding of the bucket tappets. In the case of a camshaft bearing that is arranged approximately in the center between the axes of identical valves of a combustion chamber and has a detachably fastened bearing bracket, the bottom part of the bearing that forms one piece with the timing case, when the breakthroughs are made that serve for the guiding of the bucket tappets, is cut at both opposite front sides to the wall thickness of the web. In order to eliminate the disadvantage of the friction bearing surface for a camshaft bearing collar that is reduced by the cutting of the bottom part of the bearing, this camshaft bearing is equipped with bearing bushes for the development of a perfect hydrodynamic lubricating film.
These bearing bushes represent additional structural elements, the cost of which increases with the number of cylinders and the number of camshafts of an internal-combustion engine. Since, in addition, when the cylindrical breakthroughs are made, on the one hand, and the bearing bore, on the other hand, the contours of cylinders penetrating one another at a right angle are made by cutting, there in the area of the intersections a working sequence with an interrupted cut. Therefore, at least in the case of the making of several aligned camshaft bearing bores that comply with the contour, an increased cost with respect to manufacturing is required.
The invention is based on the objective of indicating, for a timing case according to the prior art device as previously described having a camshaft bearing arranged between narrowly adjacent breakthroughs, a development in the case of which contours of cylinders penetrating one another at a right angle of camshaft bearing bores as well as breakthroughs and thus a machining of such intersections are avoided.
This objective is achieved in a timing case wherein the timing case is developed separate from the cylinder head, and wherein the breakthroughs disposed transversely with respect to the cam shaft bearing and approximately in the area of the smallest wall thickness of the web at a predetermined distance from the bearing surface in the bottom part of the bearing in such a way that on both sides of the web a bearing wall remains at the bottom part of the bearing that has the bearing surface, the bearing wall being integral with the web. By means of the first characteristic of the timing case constructed separately from the cylinder head, the breakthroughs serving for the guiding of the bucket tappets can advantageously by machined from the side facing away from the camshaft bearing. By means of this machining direction of the breakthroughs, it is in a further advantageous way, possible to construct the timing case according to other characteristics of the characterizing part. Accordingly, the bottom part of the camshaft bearing is cut by means of the narrowly adjacent breakthroughs, but these cuts end at a predetermined distance from

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