DE242232C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- ■ M 242232 CLASS 46 c. GROUP

GUSTAV MEES in CHARLOTTENBURG.

Cooling device for the exhaust valves of vehicle engines.

Patented in the German Empire on April 7, 1911.

In vehicle engines, it is of great importance that the exhaust valves - both the The valve disc as well as the spindles - in the interests of operational safety, as cold as possible to obtain. The best way to do this is to have the valves cools from the inside out by introducing water into the hollow valves. This cooling method is now already

ίο has long been generally used in large gas engines, however, the transfer of the cooling device that is customary here comes across to vehicle engines to insurmountable difficulties, as it is practical, especially with multi-cylinder engines it is impossible to provide each valve with a cooling water inlet and outlet. The present invention aims to remedy this situation in that the cooling water does not flow in a closed stream through the hollow valve, as in large gas engines, but is introduced drop by drop into it is to evaporate in it on the hot walls and so the cooling to effect.

The accompanying drawing shows a section through the exhaust valve of a vehicle engine. Α is the hollow valve, the spindle b of which is also pierced. The valve seat body is closed at the top r by a ring k, which with the interposition of sealing rings on the one hand through the small mother m on the spindle guide and η at this body against respective annular surfaces on the other hand through the large valve seat nut is pressed. This creates a watertight, sealed chamber 45

which is connected to the cooling water drain pipe p of the cylinder jacket through a small tube u , so that cooling water can penetrate from the drain pipe .p into this valve seat chamber. This initially prevents the valve spring f from burning out, which would rest on the hot wall of the valve seat when the valve was not cooled. Inside this cooling chamber, small bores i X _{1 are made} in the guide of the valve spindle at a certain height, which correspond to one or more bores 0 in the valve spindle itself when the valve is in its lowest position, i.e. when it is fully open. So every time during the short stay of the valve in the lowest position, a small droplet of water from the cooling chamber will penetrate the valve in order to evaporate there on the bottom of the hollow valve disk. The vapor developed then escapes through small bores ν V ₁ in the upper end of the spindle.

The amount of water penetrating into the valve through the bores i and 0 can easily be regulated once and for all by appropriately selecting the size of these bores so that no more water is admitted into the valve than can evaporate therein.

So that in the event that one of the outlet valves happens to be in its lowest position when a multi-cylinder engine is at a standstill, the water cannot gush out through the upper bores ν V _{1 of} the valve spindle, the device can be made that the water supply tube u

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can be shut off by a small tap. It goes without saying that the Cooling water in the valve seat chamber can also be effected in another way, as described, without changing anything in the essence of the invention.

Claims (1)

Patent claim: Cooling device for the exhaust valves of vehicle engines, characterized in that that from a watertight sealed valve seat chamber, which in some way with the cooling water space of the cylinder or with the cooling water drain pipe in communication in which lowest position of the outlet ven tiles through holes in the spindle guide and in the spindle itself water is let into the hollow valve drop by drop and the as a result of the evaporation of this water on the walls of the valve disc, steam developed through holes in the uppermost part the spindle is released into the open. 1 sheet of drawings.