AUTOMOBILE INTERNAL COMBUSTION ENGINE WITH CAMSHAFT-DRIVED HIGH-PRESSURE FUEL PUMP

Abstract

Internal combustion engine of a motor vehicle equipped with a fuel injection system, comprising a camshaft (6) disposed in a closed volume of a cylinder head (2) having a channel (20) supplied with pressurized oil for the lubrication of this camshaft (6), and comprising a high-pressure fuel pump including a cylindrical roller (12) fixed to the end of a sliding pump tappet (14), which bears against a pump cam (10) of the camshaft (6), the cylinder head (2) having an oil jet (30) connected to the lubrication channel (20), which has a calibrated flow control bore (38) directed towards the pump cam (12). Figure 1

Claims

Demands

1. Internal combustion engine of a motor vehicle equipped with a fuel injection system, comprising a camshaft (6) disposed in a closed volume of a cylinder head (2) having a channel (20) supplied with pressurized oil for the lubrication of this camshaft (6), and comprising a high-pressure fuel pump comprising a cylindrical roller (12) fixed to the end of a sliding pump tappet (14), which bears against a pump cam (10) of the camshaft (6), characterized in that the cylinder head (2) has an oil jet (30) connected to the lubrication channel (20), which has a calibrated flow control bore (38) directed towards the pump cam (12).

2. Heat engine according to claim 1, characterized in that the calibrated bore (38) is made over the full length of the oil jet (30).

3. Heat engine according to claim 2, characterized in that the calibrated bore (38) has along the length of the oil jet (30) a part with a local reduction in cross-section.

4. Internal combustion engine according to any one of the preceding claims, characterized in that the oil jet (30) has a thread for screwing into the cylinder head (2).

5. Heat engine according to claim 4, characterized in that the oil jet (30) has a head (36) bearing on a plane of the cylinder head (2), comprising an outer contour allowing a grip by a screwing tool.

6. Internal combustion engine according to any one of the preceding claims, characterized in that the oil jet (30) is equipped with a filter (33) at its oil inlet

7. Heat engine according to any one of the preceding claims, characterized in that the oil jet (30) forms a jet (40) which is directed upwards.

8. Heat engine according to any one of the preceding claims, characterized in that the lubrication channel (20) supplies each of the bearings (26) of the camshaft (6).

9. Motor vehicle comprising a heat engine, characterized in that this heat engine is according to any one of the preceding claims.

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