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Combustion chamber structure of direct injection type diesel engine

A technology for combustion chambers and diesel engines, applied to combustion engines, mechanical equipment, engine components, etc., to achieve good fuel atomization and diffusion effects

Inactive Publication Date: 2009-03-04
HINO MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A region where fuel concentrates is formed locally, which easily leads to the generation of black smoke

Method used

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  • Combustion chamber structure of direct injection type diesel engine
  • Combustion chamber structure of direct injection type diesel engine
  • Combustion chamber structure of direct injection type diesel engine

Examples

Experimental program
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Embodiment Construction

[0024]

Embodiments of the present invention are explained below with reference to the drawings.

Figures 13-27 An example of the present invention is shown. and figure 1 and figure 2 The same reference numerals denote the same components.

[0025]

About the above reference figure 1 The illustrated direct-injection diesel engine 1, in this embodiment, as Figure 13 As shown, the outer peripheral portion of the opening of the recessed portion 10 provided on the top surface of the piston 9 is provided with a step-shaped cut-out portion 24 that is recessed relative to the top surface of the piston 9 . The outer peripheral portion of the bottom surface of the digging portion 24 rises radially outward along a gentle curved surface to form the top surface of the piston 9, and forms an inlet lip 11 at the next step of the piston 9 top surface, and the inlet lip 11 is formed by The inner peripheral portion of the cut-out portion 24 and the combustion chamber wall surface 12...

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PUM

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Abstract

Combustion chamber structure of a direct injection type diesel engine arranged such that generation of black smoke or degradation in fuel efficiency can be avoided as much as possible even if the recirculation quantity of exhaust gas is increased. In the direct injection diesel engine having a cavity (10) provided in the top surface of the piston (9) to constitute the majority of the combustion chamber and injecting fuel radially from the center of the ceiling portion of a cylinder toward the inner circumferential surface of the cavity (10) to cause it to self-ignite, a bored portion (24) recessed from the top surface of the piston (9) to form a step difference is provided in the outer circumferential part of the opening of the cavity (10). Outer circumferential part of the bottom face of the bored portion (24) ascends to describe a gentle curved surface toward the radial outside and reaches the top surface of the piston (9). An inlet lip (11) is formed at a position lower by one step than the top surface of the piston (9) by the inner circumferential portion of the bottom face of the bored portion (24) and the combustion chamber wall face portion (12) rising from the bottom face of the cavity (10).

Description

technical field [0001] The invention relates to a combustion chamber structure of a direct-injection diesel engine. Background technique [0002] Historically, the so-called exhaust gas recirculation (EGR) device has been used in some automobile diesel engines to draw part of the exhaust gas back to the intake side from the exhaust side, and the exhaust gas drawn back in the intake side can suppress the combustion of fuel in the diesel engine And reduce the combustion temperature, thereby reducing the generation of NOx. [0003] figure 1 It shows an example of a diesel engine equipped with an exhaust gas recirculation device. For the diesel engine 1 shown in the figure, the exhaust passage 3 flowing through the exhaust gas 2 and the intake passage 4 are connected by an EGR pipe 5. The EGR pipe 5 is provided in the middle The EGR valve 6 sends part of the exhaust gas 2 and the intake air 7 into the cylinder of the diesel engine 1 for recirculation, so as to reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B23/06F02F3/26
CPCY02T10/125F02B23/0696F02B23/0672F02B23/0693F02B2275/40Y02T10/12F02B23/06F02F3/26
Inventor 饭洼将太郎中岛大足立祐辅下川清广
Owner HINO MOTORS LTD
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