Cylinder Crankcase Having at Least One Riser Duct and Internal Combustion Engine Comprising a Cylinder Crankcase

Abstract

A cylinder crankcase for an internal combustion engine includes at least one riser duct. The cylinder crankcase comprises at least one additional riser duct, which is configured to exchange oil between the main oil gallery and the cylinder head. The cylinder crankcase also comprises a connecting duct, via which the at least one riser duct and the at least one additional riser duct are connected in an oil-conducting fashion.

Claims

1.-10. (canceled)

11. A cylinder crankcase for an internal combustion engine comprising: at least one riser duct which is configured to exchange oil between a main oil gallery of the cylinder crankcase and a cylinder head of the internal combustion engine, wherein the cylinder crankcase comprises at least one additional riser duct, which is configured to exchange oil between the main oil gallery and the cylinder head, and a connecting duct, via which the at least one riser duct and the at least one additional riser duct are connected in an oil-conducting fashion.

12. The cylinder crankcase according to claim 11, wherein the at least one riser duct and the at least one additional riser duct are oriented at least parallel to one another.

13. The cylinder crankcase according to claim 12, wherein the at least one riser duct and/or the at least one additional riser duct opens into the connecting duct.

14. The cylinder crankcase according to claim 13, wherein the at least one riser duct and/or the at least one additional riser duct ends at a top surface of the cylinder crankcase, which top surface faces toward the cylinder crankcase during the intended use of the cylinder crankcase and of the cylinder head.

15. The cylinder crankcase according to claim 14, wherein the at least one riser duct is arranged at a first side of the cylinder crankcase, and the at least one additional riser duct is arranged at a second side, situated opposite the first side, of the cylinder crankcase.

16. The cylinder crankcase according to claim 15, wherein the first side is configured as an inlet side, and the second side is configured as an outlet side.

17. The cylinder crankcase according to claim 15, wherein the connecting duct passes through an outer wall of the cylinder crankcase on the first side.

18. The cylinder crankcase according to claim 17, wherein an escape of oil via the connecting duct is prevented on the second side.

19. The cylinder crankcase according to claim 18, wherein the connecting duct is closed on the first side and/or on the second side with respect to surroundings of the cylinder crankcase via a plug or a sensor.

20. An internal combustion engine comprising: the cylinder crankcase according to claim 19.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 shows a schematic perspective view of a subregion, illustrated partially in section, of an internal combustion engine which comprises a cylinder crankcase and a cylinder head that is connected in oil-tight fashion to the cylinder crankcase at a top surface of the cylinder crankcase, wherein the cylinder crankcase comprises a riser duct and an additional riser duct which are configured for the exchange of oil between a main oil gallery of the cylinder crankcase and the cylinder head and which are connected to one another via a connecting duct; and

[0023] FIG. 2 shows a further schematic perspective view of the subregion of the internal combustion engine.

DETAILED DESCRIPTION

[0024] FIG. 1 and FIG. 2 show, in each case in a schematic illustration, respective subregions of an internal combustion engine 100 having a cylinder crankcase 10 and having a cylinder head 50. The internal combustion engine 100 is in this case arranged in a motor vehicle K and serves for the propulsion thereof. In other words, the motor vehicle K comprises the internal combustion engine 100.

[0025] During the intended use of the cylinder head 50 and of the cylinder crankcase 10, the cylinder head 50 is arranged sealingly on a top surface 12 of the cylinder crankcase 10 and/or is in contact with and screwed to the cylinder crankcase 10. A cylinder head seal (not shown in any more detail here) of the internal combustion engine 100 serves for the sealing between the cylinder head 50 and the cylinder crankcase 10.

[0026] The cylinder crankcase 10 comprises a riser duct 20, which is configured for the exchange of oil between a main oil gallery (not shown in any more detail here) of the cylinder crankcase 10 and the cylinder head 50.

[0027] Furthermore, the cylinder crankcase 10 comprises an additional riser duct 30, which is likewise configured for the exchange of oil between the main oil gallery and the cylinder head 50. The cylinder crankcase 10 furthermore comprises a connecting duct 40, by means of which the riser duct 20 and the additional riser duct 30 are connected in oil-conducting fashion. The riser duct 20 and the additional riser duct 30 are in the present case oriented parallel to one another.

[0028] The riser duct 20 and the additional riser duct 30 are in this case oriented parallel to the direction of gravitational force, that is to say in other words parallel to a direction in which gravitational force acts. Accordingly, in the present case, a respective central axis of the respective riser ducts 20, 30 runs parallel to the direction of gravitational force.

[0029] In the present case, the riser duct 20 and the additional riser duct 30 open directly into the connecting duct 40.

[0030] The riser duct 20 and the additional riser duct 30 furthermore end at the top surface 12 of the cylinder crankcase 10, which top surface faces toward the cylinder crankcase 10 during the intended use of the cylinder crankcase 10 and of the cylinder head 50. The riser duct 20 has a transfer point 22 which is configured as an opening of circular or elliptical cross section and via which the oil can be conducted to components, in particular components arranged at an inlet side, which may be arranged on the cylinder head 50. By contrast, the additional riser duct 30 has a transfer point 32 which is configured as an opening of circular or elliptical cross section and via which the oil can be conducted to further components, in particular components arranged at an outlet side, which may be arranged on the cylinder head 50. In the present case, the transfer points 22, 32 are configured as circular openings and can thus be sealed off particularly easily by means of the cylinder head seal in order to prevent an undesired escape of oil (leakage) to surroundings U of the cylinder crankcase 10 and thus of the internal combustion engine 100.

[0031] It can furthermore be seen from FIG. 1 and FIG. 2 that the connecting duct 40 is oriented in a transverse extent direction y, indicated by an arrow, of the cylinder crankcase 10. Accordingly, the connecting duct 40 is oriented perpendicular to a longitudinal extent direction x, illustrated by a further arrow, of the cylinder crankcase 10. Furthermore, FIG. 1 and FIG. 2 show that, in a transverse extent direction y, the riser duct 20 and the additional riser duct 30 have a spacing greater than a respective diameter of respective cylinder bores arranged on the cylinder crankcase 10. In this way, any structural weakening of the cylinder crankcase 10 in the region of the cylinder bores as a result of the riser ducts 20, 30 can be kept particularly minor.

[0032] The riser duct 20 is arranged at a first side 14, configured as an inlet side, of the cylinder crankcase 10, whereas the additional riser duct 30 is arranged at a second side 16, situated opposite the first side 14 in a transverse extent direction y and configured as an outlet side, of the cylinder crankcase 10. Here, the “inlet side” corresponds to the side at which gas exchange valves of the internal combustion engine 100 that are configured as respective inlet valves are arranged, whereas the “outlet side” corresponds to the side at which gas exchange valves of the internal combustion engine 100 that are configured as respective outlet valves are arranged. By means of the gas exchange valves, a charge exchange can be performed at respective combustion chambers of the internal combustion engine 100, that is to say, in other words, fresh air and exhaust gas can be intermittently supplied to the respective combustion chambers and discharged from the respective combustion chambers respectively.

[0033] The connecting duct 40 passes through an outer wall 18 of the cylinder crankcase 10 on the first side 14. An escape of oil via the connecting duct 40 to the surroundings U of the cylinder crankcase 10 and of the internal combustion engine 100 is prevented on the first side 14, and additionally or alternatively on the second side 16, by virtue of the connecting duct 40 being closed on the first side 14 and additionally or alternatively on the second side 16 with respect to the surroundings U by way of a respective closure element 60, which may be configured for example as a plug or as a sensor, in particular oil pressure sensor.

[0034] In the present cylinder crankcase 10, the connecting duct 40 is configured as a transverse bore which runs in a transverse extent direction y and which may be configured in particular as a blind bore and which extends at least from the riser duct 20, which is connected to a main oil duct of the internal combustion engine 100, at least to the additional riser duct 30. The connecting duct 40 (transverse bore) supplies oil to the additional riser duct 30, which may also be referred to as the second riser duct, within the cylinder crankcase 10, wherein the oil can be guided to the cylinder head 50 counter to gravitational force both by way of the riser duct 20 and by way of the additional riser duct 30. By means of the two riser ducts 20, 30, which in the present case are parallel, it is possible to realize a separate supply of oil to an inlet-side valve drive, an outlet-side valve drive and a hydraulic chain tensioner of the internal combustion engine 100, or possibly further outlet-side consumers of the internal combustion engine 100. The transfer points 22, 32 between the cylinder crankcase 10 and the cylinder head 50 are in the present case configured as circular openings and can thus be particularly easily sealed off by means of the cylinder head seal.

LIST OF REFERENCE DESIGNATIONS

[0035] 10 Cylinder crankcase [0036] 12 Top surface [0037] 14 First side [0038] 16 Second side [0039] 18 Outer wall [0040] 20 Riser duct [0041] 22 Transfer point [0042] 30 Additional riser duct [0043] 32 Transfer point [0044] 40 Connecting duct [0045] 50 Cylinder head [0046] 60 Closure element [0047] 100 Internal combustion engine [0048] K Motor vehicle [0049] U Surroundings [0050] x Longitudinal extent direction [0051] y Transverse extent direction