EP1666714B1 - Combustion engine block - Google Patents

Description

The invention relates to a machine housing, in particular a cylinder head for an internal combustion engine, with the features of the preamble of patent claim 1.

She goes from the European patent application EP 1 350 928 A2 out. In this a device for variable actuation of a lift valve of an internal combustion engine is described. This device is arranged in a machine housing, and consists in addition to other components at least a camshaft and a camshaft arranged in parallel to another shaft, an eccentric shaft for lifting height adjustment of the lift valve. The camshaft and the eccentric shaft are each rotatably mounted in the machine housing. A drag lever, which is provided for actuating a lift valve, is mounted on the one hand on a hydraulic base, a hydraulic clearance compensation element and on the other hand on the valve stem of a lift valve. The hydraulic base is supplied by a pressurized lubricant as well as the bearings of the camshaft and eccentric shaft.

A disadvantage of the described embodiment, the high structural complexity to supply all bearings with lubricant. As is well known to those skilled in the art, this is normally done via lubricant spray nozzles or through lubricant bores terminating in the bearings.

The document EP 0 638 706 discloses a similar configuration.

Object of the present invention is to show a simplified lubricant supply for the bearings of a generic machine housing.

This object is achieved in that the machine housing has a wall that emerges in the installed position of the machine housing from a bearing and / or spilled lubricant in the machine housing, wherein another bearing is at least partially disposed in the collected lubricant. The proposed embodiment, the manufacturing costs for a generic machine housing are reduced because the processing of lubricant holes or the use of additional lubricant spray nozzles deleted. Furthermore, the machine housing according to the invention has a reduced lubricant delivery requirement, whereby a smaller lubricant pump can be used. This also leads to lower production costs, and to a reduced fuel consumption of the internal combustion engine.

The embodiment of the invention is suitable in particular for largely parallel to the camshaft arranged waves according to claim 2. For this case, for example, the water emerging from the bearing of the camshaft lubricant can be collected in the geodetically lower trough. In addition, a part of the lubricant splashed during operation of the internal combustion engine, for example, by the cam of the camshaft in the trough is collected.

The proposed embodiment is particularly suitable for variable stroke valve trains with a stroke height adjustment by an eccentric shaft.

Fig. 1

zeigt eine Aufsicht auf ein erfindungsgemäßes Maschinengehäuse mit einer Nockenwelle und einer weiteren Welle,

Fig. 2

zeigt eine Aufsicht auf das erfindungsgemäße Maschinengehäuse ohne Nockenwelle und ohne weitere Welle.

In the following the invention with reference to a preferred embodiment is explained in more detail in two figures.

Fig. 1

shows a plan view of an inventive engine housing with a camshaft and another shaft,

Fig. 2

shows a plan view of the machine housing according to the invention without a camshaft and without another shaft.

Fig. 1 shows the top view of a three-dimensionally illustrated engine housing 1 with a camshaft 2, in the present case, a cylinder head for an internal combustion engine. The view is on a dividing plane 1 'of an in Fig. 2 recognizable bearing 3 another shaft 4 directed. The further shaft 4 has on its outer circumference a gear segment 4 'with an outer toothing 4 ". This gear segment 4' serves to rotate the further shaft 4 during operation of the internal combustion engine, in the present embodiment an eccentric shaft, by means of a worm wheel (not shown) 4 'is arranged in sections in a geodetically deeper depression 6 and protrudes into a lubricant collected in the depression 6. The depression 6 is formed by three outer walls 1 "of the machine housing 1 and a wall 5 which according to the invention is oriented largely vertically in the installed position in the embodiment between two outer walls 1 "extends, represented by a double arrow .. In addition to the gear segment 4 'and a part of the bearing 3 is arranged in the collected in the trough 6 lubricant.

During operation of the internal combustion engine, the depression 6 in the present embodiment is filled up with lubricant sprayed by the valve drive and lubricant injection nozzles. In another embodiment, a further bearing can be arranged geodetically above the trough 6, in which case the trough 6 is additionally filled with lubricating lubricant exiting from this bearing and, depending on the structural design.

In the present embodiment, the further shaft 4, as already briefly noted above, an eccentric shaft for a variable-stroke valve drive, wherein the further shaft 4 is arranged parallel to the camshaft 2. Of course, even more arranged in the machine housing 1 bearings of waves or moving components can be lubricated in the manner of the invention. In further embodiments, the wall 5 may also be cup-shaped, free-standing formed on a bottom surface of the machine housing 1, without having a direct contact with the side walls 1 '. In this case, the trough 6 is formed only by the wall 5 and the bottom surface of the machine housing.

Fig. 2 shows the same structure of Fig. 1 , but without camshaft 2 and without further shaft 4. The same reference numbers apply to the same components.

Owing to the embodiment according to the invention, the manufacturing or manufacturing costs for a generic machine housing are reduced, since no lubricant bores or separate lubricant spray nozzles are necessary for the bearing 3 and / or the external teeth 4 " In addition, the energy requirement of a smaller lubricant pump is lower, which reduces fuel consumption is reduced during operation of the internal combustion engine.

LIST OF REFERENCE NUMBERS

1

machine housing

1'

parting plane

1"

outer wall

2

camshaft

3

camp

4

Another wave

4 '

gear segment

4 '

external teeth

5

wall

6

trough

Claims (3)

1. An engine housing (1), in particular a cylinder head for an internal-combustion, in which a camshaft (2), the bearings (3) of which are acted upon by a lubricant under pressure, and also a further shaft (4) which is rotatably mounted in at least one further bearing (5), wherein the engine housing (1) has a wall (5), characterised in that, in the installed position of the engine housing (1), the wall collects lubricant emerging from a bearing (3) and/or sprayed in the engine housing (1), wherein the further bearing (5) is arranged at least in sections in the collected lubricant.
2. An engine housing according to Claim 1,
   characterised in that the further shaft (4) is a shaft arranged substantially parallel to the camshaft with at least one radial control path.
3. An engine housing according to Claim 1 or 2, characterised in that the further shaft (4) is a control shaft for a variable stroke valve gear.

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