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Valve drive for an internal combustion engine

A valve mechanism, internal combustion engine cylinder technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of disturbing acoustic effects, expensive production, complexity, etc., to reduce manufacturing costs, minimize friction, and avoid acoustic problems Effect

Active Publication Date: 2020-02-04
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Disadvantages of the above-mentioned valve train are its complex and expensive production as well as disturbing acoustic effects based on axial meshing with tolerances during operation of the internal combustion engine

Method used

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  • Valve drive for an internal combustion engine
  • Valve drive for an internal combustion engine
  • Valve drive for an internal combustion engine

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Embodiment Construction

[0030] below in Figures 1 to 5 The same reference numerals are used for the same parts.

[0031] figure 1 A plan view of a valve train 1 for a cylinder head of an internal combustion engine according to the invention is shown. Cylinder heads without reference numerals are shown without valve caps, so that the valve train 1 can be seen. The valve train 1 is arranged on the intake side and is provided for two cylinders with four identically acting figure 2 The ventilation valve shown in.

[0032] The valve train 1 according to the invention has a first camshaft 4 which is mounted rotatably in first and second camshaft bearings 2 , 3 and in a further camshaft bearing not shown with reference numerals. On the exhaust side, there is a second camshaft, which has no reference numerals. In the present exemplary embodiment, the first camshaft 4 has four cams 5 for four gas exchange valves (not shown) of the two cylinders of the internal combustion engine, of which only one cam 5...

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Abstract

The invention relates to a valve drive for a cylinder head of an internal combustion engine, comprising a first camshaft which is rotatably mounted in a first and a second camshaft bearing and which comprises at least one cam with a first cam curve and a second cam curve that differs from the first cam curve, wherein a gas exchange valve can be actuated by the first or the second cam curve, a camshaft section is provided, by means of which the cam can be moved by an adjusting means such that the gas exchange valve can be actuated either via the first or the second cam curve, the first camshaftand the cam have a fixed position relative to each other, the first camshaft can be axially moved in the first and the second camshaft bearing, and an axial lock is provided for the camshaft. By means of the valve drive design according to the invention, a substantial reduction of production costs is achieved compared to the prior art and undesired toothing noises are prevented. Additionally, thecamshaft is axially locked depending on which cam curve is interacting with the gas exchange valve.

Description

technical field [0001] The invention relates to a valve train for a cylinder head of an internal combustion engine having the features of the preamble of claim 1 . Background technique [0002] For the technical background see, for example, European patent application EP 0 595 060 A1. From this patent application a valve train of an internal combustion engine is known which has a pretensioned sliding cam which is axially displaceable on a camshaft. The sliding cam in the first position can be moved into the second position, in which the sliding cam acts on the intake valve with a first lift curve (Erhebungskurve) and in the second position with a second lift The curve acts on the intake valves. In the first position, the sliding cam rests positively against the stop of the transmission element connected between the intake valve and the sliding cam, as long as the sliding cam is rotated by one section in the stop region. When the base circle of the sliding cam is reached, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L13/00F01L1/047
CPCF01L1/047F01L13/0036F01L2001/0476F01L2013/0052F01L1/053F01L1/185F01L2001/0471
Inventor G·艾默斯伯格D·克诺尔R·克拉夫特R·施密德T·施泰因勒
Owner BAYERISCHE MOTOREN WERKE AG
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