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Internal combustion engine

An internal combustion engine and actuator technology, applied to engine components, machines/engines, mechanical equipment, etc., can solve the problems of complicated installation and limited flexibility, and achieve the effect of simplifying assembly, simplifying processing, and reducing structural tolerances

Inactive Publication Date: 2012-03-14
DR ING H C F PORSCHE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously known installations of valve timing mechanisms with a sliding cam assembly are complex and lead to limited flexibility

Method used

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  • Internal combustion engine
  • Internal combustion engine
  • Internal combustion engine

Examples

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Embodiment Construction

[0019] figure 1 Shown is an opposed-cylinder internal combustion engine 1 formed of two banks of cylinders 1a and 1b arranged horizontally. The internal combustion engine 1 comprises a crankcase 2 and a cylinder head 3 per bank of cylinders 1 a and 1 b , which is delimited on the outside by a cylinder head cover 4 . The cylinder head 3 is assembled from a cylinder head lower part 5 and a camshaft housing 6 .

[0020] Such as figure 2 As mentioned, an intake camshaft 7 and an exhaust camshaft 8 are mounted in the camshaft housing 6 for controlling the gas exchange valves of the internal combustion engine 1 . According to the invention, the camshaft housing 6 is attached as a pre-assembled unit to the cylinder head lower part 5 and is screwed to the latter. After the camshaft housing 6 is mounted on the cylinder head lower part 5 , the cylinder head cover 4 is attached to the camshaft housing 6 . A plurality of bolts 12 are provided for fastening the cylinder head cover 4 t...

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Abstract

Disclosed herein is an internal combustion engine having a plurality of cylinders, a crankcase, a cylinder head and a cylinder-head cover, the cylinder head being formed from a cylinder-head lower part and a camshaft housing which is positioned between the cylinder-head cover and the cylinder-head lower part, and at least one camshaft and one sliding cam which can be displaced axially on the camshaft and has a slotted-guide section being provided for actuating gas exchange valves of the internal combustion engine, an actuator with an actuable pin being provided for bringing about an axial displacement of the sliding cam. The camshaft and the sliding cam are positioned in the camshaft housing. The camshaft, which is mounted rotatably for valve actuation, is arranged with the axially displaceable sliding cam in the camshaft housing in such a way that they can be attached to the cylinder-head lower part as one preassembled unit.

Description

technical field [0001] The invention relates to an internal combustion engine having a plurality of cylinders. Background technique [0002] In modern internal combustion engines, the variable valve timing mechanism is used to optimize the charging movement in the combustion chamber. Through the variable valve timing mechanism, different valve strokes can be set for multiple gas exchange valves of the internal combustion engine. DE 19611541 C1 already discloses a valve timing mechanism of an internal combustion engine by which it is possible to actuate one gas exchange valve by means of several different lifting cams. For this, a sliding cam with cam surfaces is mounted on the camshaft in a non-rotatable but axially displaceable manner, the sliding cam has a lifting profile, an actuating element engages in the form of a pin on the camshaft. In this lifting profile, the axial displacement of the cam is generated. As a result of the axial displacement of the cams, different ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L13/00F01L1/047F01L9/04F01L9/10F01L9/20
CPCF01L1/053F01L13/0042F01L1/047F02F1/24F01L13/00
Inventor F·伊金尔J·格林贝格尔
Owner DR ING H C F PORSCHE AG
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