VALVE IMPULSE FOR AT LEAST TWO AT THE SAME TIME TO OPERATION OF STROKE VALVES FOR THE GAS CHANGE OF AN INTERNAL-COMBUSTION ENGINE

The invention concerns a valve impulse for at least two stroke valves for the gas change of an internal-combustion engine, which can be operated at the same time, after the generic term of the first patent claim.

A such valve impulse is descriptive with US patent specification 1,639,874. With this valve impulse that is valves which can be operated together in the cylinder head of led Tassenstö&szlig for everyone; el intended. The Tassenstöß el are rigidly connected turned to end at their the cam shaft with a yoke. On the yoke a cam of the cam shaft affects central a particularly prepared guideway. In particular by the rigid connection of the Tassenstöß el over the yoke step due to the different temperatures at the yoke and at the cylinder head as well as by different materials for the yoke as well as for the cylinder head with the enterprise of the internal-combustion engine differently groß e thermal expansions, which lead to spannings of the construction units and to operation difficulty of the valve impulse.

With DE-OS a valve impulse is descriptive 42 26 760, with which also for everyone valve a Tassenstö&szlig which can be operated; el is intended and on the even grounds of the Tassenstö&szlig also pointing to the cam shaft; el a crossbar loosely rests upon, only by Formschluß against shifting opposite the Tassenstöß eln is secured and is in all other respects of the cam of the cam shaft in his function situation held. With such an valve impulse spannings cannot occur due to different thermal expansions. Beyond that can in favourable way during such an execution on commercial Tassenstöß el to be fallen back, which can be provided with a hydraulic valve clearance balance mechanism. Such an valve impulse has however due to the sliding friction between cam course and crossbar friction losses, which are detrimental to the efficiency of the internal-combustion engine.

The invention is the basis the task to create a valve impulse with which by a cam from two or more stroke valves can be operated, whereby the cam influences over a role on the stroke valves and with in relation to well-known multi-valve drives with Rollenstöß eln a smaller building expenditure with at the same time small space requirement is necessary.

Erfindungsgemäß this task is solved by the characteristic characteristics of the first patent claim.

In a preferredwise execution form the guidance plate of the first stroke valve is simultaneous contact surface for the Schließ feather/spring of this stroke valve. Thus will a separate spring disc for the first valve dispensable and the partial expenditure for the valve impulse can be reduced in such a way.

The further stroke valves of the common group of stroke valves are provided with actually well-known spring discs, over which the valve stem ends exceed toward to the yoke. The use actually well-known spring disc at the further stroke valves makes an economic building method possible of the valve impulse, by to commercial and/or for other valve impulse designs already existing parts can be fallen back.

A remark example of the invention is below descriptive on the basis a design more near. Show

Fig. 1:

a cut by one erfindungsgemäß EN valve impulse;

Fig. 2:

an opinion from direction A in figure 1.

With the remark example it acts around a valve impulse for the manipulation of a common group of stroke valves, which of two stroke valves 1 and 2 consists, which both Einlaß valves and Auslaß valves of an internal-combustion engine to be can. The first stroke valve 1 is led with its valve stem 3 in a valve guide can 4, which in the cylinder head 5 eingepreß t is. A valve stem sealing 6 prevents the inadvertent penetrating of oil along the valve stem 3. at the valve stem 3 of the valve 1 is circulating slots 7, in which adequate ribs of Ventilkeilen 8 intervene. The Ventilkeile 8 form toward the valve disk 9 tapering cone, over which a kegelige drilling of a guidance plate 10 seizes. The guidance plate 10 is pressed by a valve spring 11, which pushes on the other hand on the cylinder head 5 away, on the Ventilkeile 8, so, daß one axially and radially rigid connection between the guidance plate 10 and the valve stem 3 is creative. The guidance plate 10 has a cylindrical extent 12, which pushes in a cylindrical drilling 13 away of the cylinder head 5 sliding radially. A part of 14 of the valve stem 3 with the valve stem end 15 stands out over the guidance plate 10. On this part of 14 a yoke 16 postponed with a mounting hole 17 with slide fit is. An adjustment device in the upper end of the mounting hole 17, which is exemplarily as adjusting bolt 18 with lock nut 19 designed here, relies on the valve stem end of 15 off. The yoke 16 extends underneath a cam shaft 20 with cams 21 to the valve stem end of 22 of the stroke valve 2 and supports themselves on this likewise with an adjustment device, consisting of an adjusting bolt 23 with lock nut 24 within a drilling 25 of the yoke 16, off.

The stroke valve 2 is led in usual way with its valve stem 26 in a valve guide can 27. A valve stem sealing 28 prevents the inadvertent passing of oil along the valve stem 26. At the upper range of the valve stem 26 a valve retainer 29 is fastened 33 to the valve stem 26 in usual way by means of circulating slots and into these decisive ribs to Ventilkeilen 34. Against this valve retainer 29 a valve spring supports itself off of 30 with one its ends, while the other end at the cylinder head pushes 5 away.

In the yoke 16 a role of 31 is stored between the mounting hole 17 and the drilling 25, thus between the center axles of the two stroke valves 1 and 2, which rests against the course of the cam 21. The cam shaft 20 with the cam 21 turns so, daß the cam course at the role of 31 a movement of the mounting hole 17 away to the drilling 25 makes. The direction of rotation of the cam shaft 20 therefore corresponds to the direction of the arrow 32.

During the enterprise of the internal-combustion engine the cam 21 operates at the same time the two valves 1 and 2, as the cam course on the role 31 runs off toward the arrow 32. The cam collection is passed as Ventilhub over the role 31 to the yoke 16 and from this over the adjusting bolts 18 and/or 23 to the valve stem ends 15 and/or 22 and thus to the valves 1 and/or 2. the valves 1 and 2, those from their valve springs 11 and 30 into Schließ position held are, open then. The yoke 16 is kept safe by the guidance of the mounting hole 17 on the top 14 of the valve stem 3 opposite dumps. The forces additionally affecting thereby the valve stem 3 will transfer 13 in the cylinder head 5 over the guidance plate 10 fastened to the valve stem 3 to the wall of the drilling. The direction of travel of the cam shaft 20 marked by the arrow 32 causes the situation of the yoke 16 stabilizing Kraft at the role of 31 of the yoke 16, so daß a swivelling of the yoke 16 around the mounting hole 17 and/or around the center axle of the valve 1 during the enterprise of the internal-combustion engine does not arise. Also an edge 35 at the drilling 25 seizing over the edges of the valve stem end of 22 of the valve 2 works against such swivelling for the admission of the adjustment device for the valve 2.

The remark example shows a valve impulse for the simultaneous manipulation of two stroke valves by a cam. The invention is however just as suitable to operate e.g. three stroke valves at the same time by the yoke at a valve stem, whose axle center before the cam shaft axle, related to which direction of rotation of the cam shaft runs, in the represented way is led and then over the valve stem ends of the remaining stroke valves extended, whose axle centers behind the cam shaft axle run.

Likewise the invention is not limited to the use from mechanical adjustment devices to adjusting the valve clearance. Are suitable e.g. just as closed hydraulic valve clearance compensating elements, which are taken up then in the appropriate drillings of the yoke.

The valves can also by others than the valve springs shown in the remark example in their Schließ position held its.

The special advantages of the invention are to be seen in it, daß at small building expenditure of a cam from two or several stroke valves of a group of valves opening at the same time to be operated can, the space requirement in the cylinder head for it are only small and a good mechanical efficiency enter.