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Combusion engine with valve pockets

A technology for internal combustion engines and seat rings, applied in the direction of internal combustion piston engines, combustion engines, mechanical equipment, etc., can solve the problems of negative impact on thermal efficiency, impact on combustion efficiency, impact on combustion form, etc., and achieve large mass flow, good flushing and residual gas removal , the effect of good flushing operation

Active Publication Date: 2019-04-16
MAN NUTZFAHRZEUGE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for race holes, e.g. the compression ratio is reduced, which has a negative impact on thermal efficiency
In addition, the seat ring hole also greatly affects the combustion form, and thus affects the combustion efficiency

Method used

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  • Combusion engine with valve pockets
  • Combusion engine with valve pockets
  • Combusion engine with valve pockets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] The embodiments shown in the figures are at least partly identical, such that similar or identical parts are identified with the same reference numerals, and for their explanation also reference is made to the description of the other embodiments or figures, in order to Avoid repetition.

[0046] figure 1 One cylinder 12 of internal combustion engine 10 is shown. The internal combustion engine 10 is a four-stroke internal combustion engine, in particular a four-stroke diesel internal combustion engine or a four-stroke gasoline internal combustion engine. Preferably the internal combustion engine 10 is incorporated in a commercial vehicle, such as a van or a bus, for example for driving the commercial vehicle.

[0047] The cylinder 12 has a plurality of intake valves 14 (in figure 1 Only one is shown in ), multiple exhaust valves 16 (in figure 1 Only one is shown in ), a combustion chamber 18 and a piston 20 .

[0048] The intake valve 14 connects the combustion cha...

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PUM

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Abstract

An internal combustion engine (10) for a vehicle is provided, having at least one cylinder (12) with a first gas exchange inlet valve (14A), a second gas exchange inlet valve (14B), a first gas exchange outlet valve (16A), a second gas exchange outlet valve (16B), and a piston (20) with a piston crown (16; 12; 226) which has a plurality of valve seat pockets (30, 32, 34, 36). In each case one valve seat pocket (30, 32, 34, 36) is provided for the first gas exchange inlet valve (14A), the second gas exchange inlet valve (16B), the first gas exchange outlet valve (16A) and the second gas exchange outlet valve (16B), and the plurality of valve seat pockets (30, 32, 34, 36) have at least partially different depths. Alternatively, one valve seat pocket (14A) is provided for the first gas exchange inlet valve (14A) and the first gas exchange outlet valve (16A), and no valve seat pocket is provided for the second gas exchange inlet valve (14B) and / or for the second gas exchange outlet valve (16B).

Description

technical field [0001] The invention relates to an internal combustion engine having a piston with a plurality of race bores. Background technique [0002] It is known that the piston crown of a piston of an internal combustion engine is provided with a seat ring bore for a gas exchange valve. [0003] For example, DE 10 2007 027 787 A1 discloses an internal combustion engine in which a seat ring hole is formed in the end face of the piston, which seat ring hole faces the gas exchange valve. [0004] It is also known to actuate the intake and exhaust valves with a valve overlap. Valve overlap refers to the period of time between when the intake valves begin to open and when the exhaust valves end when they close. [0005] For example, in order to be able to achieve a large valve overlap in a diesel engine, a race hole must be provided in the piston. Valve overlap is used to optimize gas exchange and thus overall engine efficiency. With a positive pressure difference betw...

Claims

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Application Information

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IPC IPC(8): F02F3/28F02B23/00
CPCF02B23/00F02F3/28F02B23/06F02D13/0257F02D13/0261F02B29/086Y02T10/12F01L1/34F01L3/22F02F1/4214
Inventor 多米尼克·雷纳托马斯·玛丽斯澈威思科
Owner MAN NUTZFAHRZEUGE AG
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