DD152390A1 - CYLINDER HEAD FOR INTERNAL COMBUSTION ENGINES - Google Patents

Abstract

The invention preferably relates to reciprocating internal combustion engines. The aim of the invention is to prevent cracking. Occurring in the valve web section temperature peaks have been dominated in general by the arrangement of heat protection plates (armor). The task - thermal relief of Ventilstegpartie - is solved according to the invention by the evaporation zone in the region of the valve land, the condensation zone of a heat pipe are arranged in the coolant chamber and thus the heat can be dissipated by conduction intensive to the coolant. Field of application are cylinder heads of reciprocating internal combustion engines in water- or air-cooled design.

Description

a) Title: Cylinder head for internal combustion engines

The invention relates to a cylinder head for Hubkolbenverbrennungsniotoren with intensive cooling.

b) Application reciprocating internal combustion engine !!

c) Characteristic of known technical solutions

In high-performance combustion engines, it is problematic to make the heat-dissipating surface in the region of the valve web sufficiently large and at the same time to avoid accumulation of material. Special measures have already been taken in the valve web of a cylinder head for the stated purpose.

In a known solution DD 116 658 (MAiI) F 02 F 1/24, for example, waived the valve land and replaced the thermally highly charged lot by enlarged valve seat rings. A disadvantage is the accumulation of heat due to poor heat transfer.

Another solution (DE 2 459 186 - KHD - F 02 F 1/42) consists in the arrangement of a heat shield plate in which the valve seat rings are arranged, which armor the valve web section. The disadvantage is the relatively high technological complexity.

d) Object of the invention

The aim is not to unduly exceed the heat resistance of the material and to prevent cracking in the valve web. , .

e) Object of the invention

The object of the invention is to heat-release the cylinder head bottom, in particular the valve web part.

overload "

f) essence of the invention.

According to the invention, this object is achieved in that the heat transfer from the valve web section to the cooling medium by the arrangement of a heat pipe (heat pipe) or more heat pipes is intensified. For this purpose, one uses the free, accessible space of the cylinder web section or the immediately adjacent space and sets the heat pipe in aen. Cylinder head floor or »in the cylinder head lower part, preferably vertically. The exchanging heat surface can be increased by an upright ribbed pipe. Possible vibration fractures can be prevented by restraining the Y-pipe in the cylinder head shell. "For thermal relief of the injection nozzle, it is also possible to place a heat pipe in a double-walled design around the injection nozzle and to work it into the cylinder head floor, with the nozzle needle being carried to the combustion chamber

As a result, from the thermally highly charged area between the inlet and outlet valve a good heat dissipation 'drove to the coolant, resulting in a reduced valve stem temperature results.

g) embodiment

Reference to exemplary embodiments of a water-cooled engine, the invention will be explained in more detail. '

FIG. 1

In the example, with removed Verschuußteil 1 from the cylinder head top 2 in the direction of the cylinder head bottom 3 a Paßsitz blind hole introduced in the valve web 4, in which the heat pipe 5 is inserted * The evaporation zone of the heat pipe 5 has due to the snug fit metallic contact with the hot valve web. 4 »Whereby the heat from the valve bar 4 i &

OO ^ l Ω

Y / poor ear 5 can flow. The heat taken up in the valve web 4 by the heat pipe 5 is released from the part of the heat pipe 5 projecting into the coolant space δ to the coolant.

With a corresponding material of the jacket of the heat pipe, the pipe can also be cast in, which reduces the amount of mechanical processing and improves contact.

Pigur 2

In a further embodiment of the above example, the Y / ear tube 5 in the region of the coolant chamber 6 has a surface-enlarging metallic body 7 connected to the heat pipe 5 in order to intensify the heat release to the coolant.

Pigur 3

In an embodiment of the example according to Pigur 1, the closure member 1 ^f is designed so that it assumes a leadership of the heat pipe 5, whereby the heat pipe is now clamped at both ends and vibration fractures of the heat pipe 5 are avoided ·

Pigur 4

In another example, the heat pipe 5 is formed as a hollow-walled pipe, which is arranged in the cylinder head bottom 4 'in Wdhe the valve web 4 and Zc B, can serve in diesel engines for receiving the Sinspritzventils 8

9 0 Qi -iU OH -; ν - - /. s

Claims (3)

Erfindungsanspräche · Cylinder head for reciprocating internal combustion engines with intensive cooling, characterized in 'that in the cylinder head floor (4'), preferably in the Ventilstegpartie (4), a heat pipe (5) is arranged. 2 cylinder head for reciprocating internal combustion engines according to item 1 with intensive cooling characterized in that in the cylinder head bottom (4 ^f )> in particular in the Ventilstegpartie (4) a heat pipe (5) is arranged in the form of a hollow-walled tube. 3 # Cylinder head according to the points 1 and 2, characterized in that through the inner opening of the heat pipe (5), the injection valve is passed through diesel engines. Kterm. JLSsiteri drawings