Combustion chamber structure

JP7789590B2Active Publication Date: 2025-12-22HINO MOTORS LTD
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Patent Information

Application Number
JP2022036810
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-03-10
Publication Date
2025-12-22
Estimated Expiration
2042-03-10

AI Technical Summary

Technical Problem

Conventional combustion chamber structures for direct injection diesel engines fail to improve air utilization and promote fuel-air mixing inside the combustion chamber, leading to inefficient combustion and reduced thermal efficiency.

Method used

A combustion chamber structure with a recessed cavity and a protrusion that extends upward from the bottom surface of the cavity, dividing the injected fuel into upper and lower parts, and a protrusion that changes the trajectory of the fuel to enhance air utilization and promote fuel-air mixing.

Benefits of technology

Improves air utilization and promotes fuel-air mixing, resulting in more efficient combustion and increased thermal efficiency.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To improve thermal efficiency by activating combustion.SOLUTION: A combustion chamber structure 100, having a cavity 10 circular in a planar view, recessed downward with respect to a piston top surface 9a, and provided for a direct injection diesel engine 1 where fuel is radially injected from a nozzle 8 at the center of a cylinder ceiling part 11 into the cavity 10 to cause self-ignition, includes a first rising part 102 rising upward from the radial outer end of a bottom face 101 so as to encircle the bottom face 101 of the cavity 10, and a protrusion part 30 provided between the nozzle 8 and the first rising part 102 in the radial direction of the bottom face 101 while extending upward from the bottom face 101 so as to hit fuel spray Fu injected from the nozzle 8 and vertically divide the fuel spray Fu.SELECTED DRAWING: Figure 2
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Citation Information

Patent Citations

  • Direct injection diesel engine premixed combustion method and its device

    CN1395028A

  • JP1974006055A

  • Combustion chamber of direct injection type diesel engine

    JP1992262020A

  • Structure of combustion chamber for diesel engine

    JP1995042558A

  • Combustion chamber for direct injection type diesel engine

    JP1999210468A