DE895675C - Slide control for internal combustion engines - Google Patents

Description

Slider Controls for Internal Combustion Engines The invention relates to on slide controls for internal combustion engines and in particular on those with cylindrical rotary valve.

There are slide controls for internal combustion engines in different Types known. Except for the sleeve-shaped valves in the engine cylinders used, guided in these, are rotary valves mounted in the cylinder head has been developed in the most varied of embodiments.

In addition to spherical, shell-like, rotatable around the cylinder axis Slides have become known as ball slides, flat slides and also roller slides.

All of these valves have considerable structural difficulties in common, which are caused by the fact that this slide in the cylinder head in the zone higher Temperature and have to work. You should be partially contradicting each other Meet demands.

Rotating at a relatively high speed, they must move easily but keep it as tight as possible. One thing demands sufficient Running game, the other not a game if possible.

To meet these demands offers with consideration for the high temperatures in which the slides have to work because of the high thermal expansion of the material that has to be accepted and which still depends on the used Material for the slide and the cylinder head is different, extraordinary Trouble.

Although the control of the motor by means of a slide has considerable advantages on the infill side and thus with regard to the power output of the motor, this control has proven itself mainly because of the difficulties described hardly noticeably introduced.

In addition, there is also a satisfactory solution to the question of a sufficient cooling of the slide, through which a better control of the mentioned Claims would be possible, mostly failing due to structural reasons.

Directly connected with this is that the lubrication Difficult to achieve because of its high velocity and temperature is, a circumstance which therefore represents one more reason for the fact that one has hitherto such Controls little applied.

The invention has set itself the task of a slide control to make with roller-like rotary valve so that the disadvantages outlined be avoided.

According to the invention, this problem is solved primarily by that they have a roller-like rotary valve mounted in the cylinder head transversely to the cylinder axis provides for two control channels located symmetrically to the slide axis for each motor cylinder has, each of which during half a turn of the slide in the immediate Alternating sequence serves as inlet and outlet channel.

As a result of this configuration, this rotary valve runs extremely slowly, namely at 1/4, the speed of the crankshaft. This slow circulation of the slide according to the invention allows a much easier control of all issues related to its storage and the thermal expansion that occurs. Appropriately here is a slide roller made of gray cast iron with a Sheath made of special bronze related.

In order to achieve a good filling of the cylinder, according to the invention in front of the main channel controlled by the slide and leading to the cylinder there is a slit upstream and - to achieve sufficient opening angles - the Ui inlet control Seen in the direction of rotation, the rear control edge or, in the case of exhaust control, the front control edge each Slide channel pulled forward or back.

In the case of in-line engines, the rotary valve can be designed as a one-piece, parallel to the crankshaft axis mounted cylinder body formed or, for reasons the thermal expansion, from individual slides per cylinder, the non-positive, for example via a toothing, are coupled to each other, be put together.

The seal between the cylinders takes place according to the invention in in each case by a resilient sealing ring between the cylinder head parts of the individual cylinders.

The rotary valve according to the invention enables intensive cooling, in that cooling air is blown through -in it provided longitudinal channels can. In the case of a vehicle engine, this can be done in the simplest way by means of the cooling fan be done by the cooling air in a provided at the front end of the slide Pressure funnel. The Künliquidli: .eit in the cooling jacket of the cylinder is after of the invention expediently in countercurrent to the cooling air through the cylinder head cooling jacket out, whereby the heat dissipation can be improved.

Due to this good cooling, the slide wind makes it possible for one hone compression ratio to use low octane fuel. in the rest; this lowers the temperature of the mixture, reducing the weight of the filling and thus the engine output is increased.

The guidance and sealing of the rotary valve in relation to the combustion chamber of the cylinder takes place according to the invention. through wall parts: the cylinder head, which are resilient with the wall thickness decreasing towards the main channel from the combustion pressure to be pressed against the slide.

The low rotational speed of the slide and its good Cooling also allow a perfect solution of its lubrication.

According to the invention, this happens via a branch line of the pressure circulation lubrication of the engine, in which a pressure reducing valve is switched on and the sm cylinder head on -the running surface of the slide opens into a resilient ball valve.

The slide pushes with its circumferential surface as it rotates. H. with the rounded rear control edge of its control channels, the ball of this Valve back, so that then oil on its running surface, which with oil distribution grooves is provided, flows. This prevents oil from entering the control channels splashes and thus gets into the combustion chamber, where it would otherwise be disadvantageous Carbon residue would form.

In the drawing .is the rotary valve control according to the invention in an embodiment shown, namely Fig. i illustrates a cross section through the cylinder head of an internal combustion engine with the rotary valve control according to the invention, 2 shows the inventive design of the lubrication of the rotary valve and Fi.g. 3 an in-line motor equipped with the rotary valve control according to the invention with partially cut lengthways cylinder head.

As can be seen from Fig. I, the invention is a Roller-like rotary valve mounted in the cylinder head transversely to the cylinder axis. To : According to the invention, this rotary slide valve i has two symmetrically located to the slide axis Control channels 2 and 3 open, each of which during half a turn of the slide once the inlet channel q. and then the outlet channel 5 via the main channel 6 with the cylinder 7 connects: the main channel 6 is a pre-slot 8 to achieve a with good filling. To achieve a sufficient opening angle, According to the invention, the rear control edge seen in the direction of rotation at inlet control g or with outlet control front control edge io of each slide channel after or. preferred. The cylinder head has wall parts 22 on, whose Wall thickness to the main channel 6 decreases, so that it is resilient due to the combustion pressure are pressed against the slide and thereby the rotary slide against. the combustion chamber seal.

The slide is lubricated according to the invention by a Branch line i i of the main pressure oil circuit of the engine. In this branch line A pressure reducing valve 12 of the usual design is used to regulate the amount of lubricant interposed (shown in Fig: 2 as a piston valve). The oil comes after this valve via a riser 13 to a control valve 1q., For example a spring loaded ball valve. According to the invention, this valve arranged so that its control member, for example the ball 15, from the passing Slide wall 16 is pressed so that the oil on the slide wall where it is expediently distributed by helical hats. The valve closes automatically when a control channel of the slider slides past.

In an in-line engine, as shown in Figure 3, the inventive Rotary valve designed as a one-piece, cylindrical body 21 or made of be composed of individual Dre'hschielbern per cylinder, the force-fit, for example by means of toothing, are coupled to one another. The seal between the individual cylinders takes place by means of resilient rings 17. For cooling, after the invention blown cooling air through the continuous hollow rotary valve, what This is best done with vehicle engines using the existing i8 cooling fan. To increase the amount of air blown through, a funnel i9 on the be provided at the front end of the slide. To further improve the cooling According to the invention, the liquid cooling of the cylinder head runs in the cooling jacket 2o in countercurrent to the cooling air in the rotary valve.

Claims (7)

PATENT CLAIMS: i. Slide control for internal combustion engines with Roller-type rotary valve mounted in the cylinder head transversely to the cylinder axis, characterized in that the rotary valve (i) per motor cylinder two symmetrical to the slide axis located control channels (2 and 3), each of which during half a turn of the slide in direct alternation as inlet and. serves as an outlet channel. 2. Slide control according to claim i, characterized in that that the main channel (6) leading to the cylinder (7) and controlled by the slide (i) a pre-slot (8) is upstream and seen in the direction of rotation when the inlet is controlled rear (9) or, in the case of exhaust control, front control edge (io) of each control channel is advanced or advanced. 3. Slide control according to claims i and 2 for In-line engines, characterized in that the rotary valve (i) is a one-story, cylinder body (21) mounted in the cylinder head parallel to the crankshaft axis or individual non-positively, for example by means of toothing, coupled to one another Find rotary valve per cylinder use. q .. Slide control according to the claims i to 3, characterized in that the sealing of the slide or slides according to outside or between the individual cylinders by means of spring, sealing rings (17) he follows. 5. Slide control according to .den claims i to q., Characterized in that that the or each cylindrical rotary valve traversed by longitudinal cooling channels through the cooling air, for example through the cooling air fan (18) of the vehicle radiator, is blown through, while the cooling jacket (2o) of the cylinder head in countercurrent is acted upon by coolant. 6. slide control according to claims i to 5, characterized in that (that the cylindrical rotary valve (i) against the Combustion chamber guided and sealed by wall parts (22) of the cylinder head is that with the main channel (6) decreasing wall thickness due to the combustion pressure be pressed resiliently against the slide. 7. Slide control according to the claims i to 5, characterized in that the lubrication of the rotary valve with the interposition a pressure reducing valve (12) through a branch line (ii) from the main oil circuit : the engine is switched off, the oil outlet opening through a controllable valve (1q.), For example ball valve, is completed, its control element, for example the ball (15), through the sliding slide wall (16) is pushed back. B. slide control according to claim 7, characterized in that the oil through helical Oil grooves on the slide wall (16) is distributed.