Cylinder head arrangement of an internal-combustion engine
AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorsGerhard Koller, Hans-Joachim Esch, Winfried Distelrath, Roland Hauf
Life of this patent
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Abstract
A cylinder head is composed of a basic housing resting on a cylinder block, said housing having gas exchange channels and valves, a bearing housing supporting camshafts and cup tappets, and a cylinder head cover. This cover is made integral with the upper parts of the camshaft bearings. The arrangement has a single separating plane, at which both the basic housing with elevated outside walls and the bearing housing and the cylinder head cover abut. This arrangement has high rigidity and is easy to assemble.
Claims10
Cylinder head arrangement of an internal combustion engine, comprising:
- a basic housing having gas exchange channels and valves controlling the latter, said basic housing being configured to be placed on a cylinder block in use on an assembled engine,
- a bearing housing to support at least one camshaft, said bearing housing having integrally formed lower bearing parts for the at least one camshaft, and
- a cylinder head cover,
- wherein upper bearing parts for the at least one camshaft are made integral with the cylinder head cover, and wherein the cylinder head cover has a flange surface which abuts against both outside walls of the basic housing and against matching surfaces of the bearing housing.
A method of making an internal combustion engine having a cylinder head arrangement including:
- a basic housing having gas exchange channels and valves controlling the latter, said basic housing being configured to be placed on a cylinder block in use on an assembled engine,
- a bearing housing to support at least one camshaft, said bearing housing having integrally formed lower bearing parts for the at least one camshaft, and
- a cylinder head cover,
- wherein upper bearing parts for the at least one camshaft are made integral with the cylinder head cover, and wherein the cylinder head cover has a flange surface which abuts against both outside walls of the basic housing and against matching surfaces of the bearing housing, said method comprising the sequential steps of:
- (i) attaching the basic housing by means of a bolted connection to the cylinder block;
- (ii) connecting the bearing housing by means of two bolted connections with a supporting surface on the basic housing, which bolted connections are arranged for minimizing bending forces introduced to the bearing housing during operation of the valves,
- (iii) machining separating plane surfaces on both the basic housing and bearing housing,
- (iv) connecting the cylinder head cover with the basic housing and bearing housing by bolted connections,
- (v) machining bearing parts for the camshafts,
- (vi) removing the cylinder head cover,
- (vii) inserting the camshafts in the bearing parts in the bearing housing, and
- (viii) reconnecting the cylinder head cover with the basic housing and bearing housing by bolted connections.
Dependencies are inferred from the claim text.