DE19621987A1 - Cylinder head for IC-engine - Google Patents

Abstract

The cylinder head has an inner cavity (2) for coolant defined by a sealed casing (1) having charge inlet and exhaust discharge ducts (3,4) and provision for the valves and ignition system. The charge inlet and exhaust gas outlet ducts are formed as preformed flow guide tubes (5,6)extending through the casing, which with their ends (7) metallically bonded into the wall of the cylinder head material. The ends of the ducts can have flanges (8) which project into the metal of the casing.

Description

The invention relates to a cylinder head for burning motors, consisting of an interior for the Cooling medium guide, open on the water side with abge the coolant-carrying interior of the engine block seals connectable housing with fuel inlet and outlet gas outlet channels and training for the arrangement of Ven parts and ignition devices.

Cylinder heads of the type mentioned are well known serve to complete the containing the actual cylinder tendency engine blocks and are usually made of gray cast iron or Aluminum formed. Due to the requirement of in the Re gel curved fuel inlet and exhaust outlet let channels, at the openings on the outside of the cylinder head ent speaking supply and discharge lines are connected, there are correspondingly complicated core designs with correspondingly complex preparatory work for the cylinder head casting, since later in the water-bearing In core representing additional space for the feed and Drainage channels must be arranged and also weight that is sufficiently thick Wall thicknesses must be taken into account.

The invention has for its object cylinder heads to improve the type mentioned in that at ge  lower core material costs ver their manufacturability is simple, constructive in order to save weight smallest possible wall thicknesses for the inlet and outlet ducts are foreseeable, other than the cylinder block mate rial can be used for the channel walls and from the front in an optimal surface quality for the Given the flow of media flowing through the channels is.

This task is with a cylinder head of the beginning named type according to the invention solved in that the Fuel inlet and exhaust gas outlet channels in the form of the Intermediate, prefabricated pipe sections trained and their ends in corresponding Wall areas of the material forming the cylinder head me are involved.

The end edges of the in the cylinder head material is metal-bound Lei pieces in the form of more or less strong elbow trained, and further are the line pieces from tube blanks deformed under hydrostatic pressure or formed from investment casting.

Apart from the fact that the pipe sections are also in the investment casting processes can be made to be very smooth to achieve nenwalls on the pipe sections, so the pipe sections initially completely independent of the Zylin derkopf be made, and connected to the  Advantage, on the one hand, the wall thicknesses as thick as necessary, but to be as thin as possible and others partly regardless of the material from which the cylinder head is to be formed, specifically for the line sections Ma material with the most optimal properties for the present to be able to choose the appropriate purpose.

The cores required to train the lei cavities in the casting of the cylinder heads are eliminated, d. that is, the line pieces form themselves to a certain extent "Lost cores" when casting the cylinder heads. Spacing Measures to keep the cores at the core are ent honest.

The prefabricated pipe sections are simply in the Large core to form the interior of the cylinder head the core production is integrated precisely, whereby le diglich the preferably bent ends of the line pieces by the required integration dimension from the be protruding areas of the core so that these protruding ends in the cast metal when casting the Zy be included.

Since the pipe sections with respect to their wall thickness, such as ge says as thick as necessary, but as thin as possible can be used and this guarantees no voids show - in investment casting is in this regard Because of the prefabrication, a preliminary test is possible - that is Whole also in the area of interest here with a Ge  weight savings up to about 70% associated with this Order of magnitude is of interest, since in mo whose engine construction endeavors to save every gram.

The cylinder head according to the invention is described below a very simplified representation of execution play explained in more detail.

It shows schematically

Fig. 1 is a vertical section through the cylinder head;

Fig. 2 is a horizontal section through the cylinder head (four-valve per cylinder) and

Fig. 3 in perspective and simplifies the necessary core.

The cylinder head for internal combustion engines still consists of a in the interior 2 for the Kühlmediumsfüh tion, water side open to the coolant-surrounding interior of the engine block (not Darge provides) sealed connectable housing 1 with fuel inlet and exhaust gas outlet channels 3 , 4 and training A for the arrangement of valves and ignition devices.

Oriented to the embodiments of FIGS. 1, 2, which only show the cylinder head part arranged over a cylinder of the engine block, it is now essential for this that the fuel inlet and exhaust ports 3 , 4 in the form of the interior 2 pass through the, prefabricated pipe sections 5 , 6 are formed and these are bound with their ends 7 in corresponding wall areas W of the material forming the cylinder head.

The ends 7 of the pipe sections 5 , 6 integrated into the wall areas by casting are embedded in the wall areas W in the form of more or less strong elbows 8 , as shown, for example. The pipe sections 5 , 6 themselves are preferably formed from the corresponding molding tools inserted pipe blanks, the final shape obtained in the ge closed molds including Abkröpfun conditions 8 under high hydrostatic internal pressure. With this prefabricated, ideally smooth-walled shape, these line pieces 5 , 6 are used to a certain extent as cores in the core, which is removed after casting from the cast cylinder and leaves the water-bearing interior 2 in the cylinder head.

The core K to be inserted into the casting mold and equipped with the line pieces 5 , 6 is shown in a highly schematic manner in FIG. 3, from which only the ends 7 provided with the crankings 8 protrude. Insofar as openings are to be taken into account for the later valve stem penetrations in the range B of the cylinder head, these areas are shown in dashed lines on the line sections 5 , 6 or openings provided on the line sections 5 , 6 with sealing membranes from suitable elements are provided from the outset Material closed so that when pouring the cylinder head no liquid metal in the channels 3 , 4 gelan gene.

Claims (4)

1.Cylinder head for internal combustion engines, consisting of an interior ( 2 ) for the coolant guide, the water side open to the coolant-encompassing interior of the engine block sealed connectable housing ( 1 ) with fuel inlet and exhaust gas outlet channels ( 3 , 4 ) and training for arrangement of valves and ignition devices, characterized in that the fuel inlet and the exhaust outlet ducts ( 3 , 4 ) are designed in the form of prefabricated pipe sections ( 5 , 6 ) which penetrate the interior ( 2 ) and areas with their ends ( 7 ) in corresponding wall areas of the material forming the cylinder head are metallically bound. 2. Cylinder head according to claim 1, characterized in that the ends ( 7 ) of the pipe pieces ( 5 , 6 ) which are metallically integrated in the cylinder head material are designed in the form of more or less strong bends ( 8 ). 3. Cylinder head according to claim 1 or 2, characterized in that the line pieces ( 5 , 6 ) are formed from investment casting. 4. Cylinder head according to claim 1 or 2, characterized in that the line pieces ( 5 , 6 ) are formed from tube blanks deformed under hydrostatic pressure.