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Gas exchange valve arrangement

A technology of ventilation valve and valve seat, applied in the direction of valve device, lift valve, engine components, etc., can solve the problem of unsuitable combustion residue and other problems, and achieve the effect of preventing burn through

Inactive Publication Date: 2008-08-13
MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore this device is not suitable for breaking up deposited combustion residues

Method used

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  • Gas exchange valve arrangement

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Embodiment Construction

[0019] The field of application of the present invention is an internal combustion engine with a gas exchange valve, especially a two-stroke large diesel engine with a large exhaust valve device on its cylinder head. The basic structure and mode of operation of such engines are well known and therefore do not require any further detailed description herein.

[0020] The gas exchange valve device shown in Figure 1 may be an exhaust valve device of the aforementioned type, which has a valve seat 3 mounted on a fixed member 1, in the example of the aforementioned two-stroke large diesel engine, is Equipped on the cylinder head and arranged at the inlet of the associated gas channel 2, in the preceding example at the inlet of the exhaust gas channel, so as to surround the inlet, while the gas exchange valve device also includes a valve 4. The valve member 4 is movable relative to the valve seat and has a valve disc 6 arranged at the lower end of the shaft 5, which cooperates with ...

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Abstract

The invention relates to a gas exchange valve arrangement for internal combustion engines, especially two-stroke high diesel engines, comprising a valve seat (3) encompassing a stationary associated flow channel (2) and a valve part (4) which can move in relation thereto and which is provided with a valve head (6) which can be placed in a sealing position on the valve seat (3). The inventive gas exchange valve is characterized by a long service life obtained by providing at least one ring-shaped narrow sealing surface (10) in the region of at least one of the mutually dependent conical surfaces (7,8) of the valve seat (3) and the valve head (6), which Is defined on at least one side by a ring-shaped material recess (11,11a).

Description

technical field [0001] The invention relates to a gas exchange valve device for an internal combustion engine, especially for a two-stroke large diesel engine. Background technique [0002] Experience has shown that the vent valves used hitherto have only a very limited lifetime. This is all due to the high susceptibility of this known device to erosion due to burn-through. Burnthrough tends to occur in gaps pressed into the sealing surfaces formed by combustion residues that collect between the sealing surfaces. If several such gaps are produced and connected together, the result is a small passage between the combustion chamber and the gas channel, through which the gases generated in the combustion chamber can flow in a strong The jet exits the combustion chamber in the form of a jet. Due to the high ignition pressure, the gas jet reaches a high velocity. Combined with relatively high temperatures, the result is a cutting jet effect which leads to rapid destruction. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/22F01L3/00
CPCF01L3/22F02F2007/0097F01L2820/01
Inventor 芬恩·Q·延森
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND