DE2759571C2 - Cast core for manufacturing an intake manifold for internal combustion engines. - Google Patents

Description

The core division shown and described can also be used for Use the manufacture of manifold assemblies simply by omitting one or two outer single intake manifolds for 5- and 4-cylinder in-line internal combustion engines is modified. Both the course of the individual intake manifolds and the Position of the distribution chamber in relation to the connection ends the respective spatial Depending on requirements, it can be varied to a large extent.

Claims (2)

Claim: Cast core for manufacturing an intake manifold for 4- up to 6-cylinder in-line internal combustion engines, - whereby the intake manifold has a distribution chamber has, of which about in one plane in pairs opposite starting sections start from individual suction pipes of essentially the same length, the curved one against the other have overlapping intermediate sections as well as final sections, which in turn have connection ends which can be connected to the inlet ducts of the machine, the end sections approximately in the same direction parallel to each other and approximately at right angles to the starting sections extend, and wherein the distribution chamber approximately centrally across the end sections is arranged, - and the core core sections for a distribution chamber and for individual suction pipes has, characterized in - that the core sections for two each other suction pipes (3, 8; 4, 7; 5, 6) each with a core section for the part of the distribution chamber in between (2) each form a separate one-piece core part (71, 72, 73) and - that the Core parts (71, 72, 73) on separating surfaces of their core sections for the distribution chamber (2) are connected to one another in a secured position. The invention relates to a casting core for producing a Intake manifold of the form described in the preamble of the claim. The manufacture of a core for a casting with such an intricate one Form requires a lot of work and is therefore expensive. The invention is based on the object of a casting core in question standing type that is easy and inexpensive to manufacture. This task is solved by a core with the characteristic Features of the claim. The core parts for the distribution chamber can easily be joined together align and connect, advantageously allowing relatively large connecting surfaces are. In the following the invention is based on an exemplary embodiment explained in more detail. It shows F i g. 1 an intake manifold for a 6-cylinder in-line internal combustion engine with the core required for their production in a section along the line 1-1 the F i g. 2, fig. 2 is a front view and FIG. 3 is a plan view of the intake manifold according to Fig. l. To illustrate the intricate shape of the core from which difficulties inevitably arise in the core production, is initially an intake manifold 1 for a 6-cylinder in-line injection engine, not shown described for whose manufacture the cast core is required. The intake manifold 1 essentially consists of a distribution chamber 2 and six individual suction pipes 3, 4, 5, 6, 7 and 8. Initial sections of the same length Individual suction pipes go parallel in a plane 9 and opposite one another in pairs from the distribution chamber 2. The individual suction pipes 3 to 8 are then to their Beginning sections curved, overlap each other and have end sections 10, It, 12, 13, 14 and 15. The final sections 10 to 15 extend in the same direction parallel to each other and at right angles approximately in a parallel plane 16 to that of the distribution chamber 2 outgoing initial sections and are by means of their connecting ends 17, 18, 19, 20, 21 and 22 with inlet channels of an internal combustion engine, not shown connectable. The distribution chamber 2 is arranged transversely from the end sections 10 to 15. Curved sections of the individual suction pipes 3 to 8 run in such a way that the two on the side of the connection ends 16 to 21 of the distribution chamber 2 outgoing individual suction pipes 5 and 6, the two inner terminal ends 19 and 20 are assigned, while the both on the side opposite the connection ends 17 to 22 of the distribution chamber 2 outgoing individual suction pipes 3 and 8, the two outer connection ends 17 and 22 assigned. The two between the named individual intake manifolds 3 and 5 or 6 and 8 further individual suction pipes 4 and 7 proceeding from the distribution chamber 2 into those lying between the inner and outer connection ends 17 and 19 or 20 and 22 Connecting ends 18 and 21 over. The curved portions of the terminal ends 18 to 21 connected individual suction pipes 4 to 7 are first from the connection ends 17 to 22 away and then curved towards these. The intake manifold 1 can be produced as a one-piece casting and designed so that it is relatively easy and simple on the outside and free of undercuts can be shaped. A corresponding design of the cast core 70 is required for this necessary. The in F i g. 1 shown in dash-dotted and dash-dotted / hatched lines Cast core 70 for casting the intake manifold 1 consists of three one-piece core parts 71, 72, 73, which interlock in the area of the distribution chamber 2 and / or are flat are connected to each other. Each of these core parts 71, 72, 73 consists of one Core section for the distribution chamber 2 and two core sections for two each other opposite from the distribution chamber 2 outgoing individual suction pipes 5 and 6, 4 and 7 or 3 and 8. By this division, the core 70 can be relatively simple and inexpensively with a dimensionally accurate connection of the individual core parts 71 to 73. In addition, there is a possible formation of cast skin or burrs at the core connection points in the distribution chamber 2, where the flow through cast skins or ridges is not disadvantageous being affected.