liquid-cooled internal combustion engine

The engine design addresses inadequate heat dissipation in high-power engines by using a dual block cooling jacket system with a top-down coolant flow, ensuring uniform and efficient cooling of critical areas.

JP7884013B2Active Publication Date: 2026-07-02AVL LIST GMBH
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
AVL LIST GMBH
Filing Date
2022-03-15
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Conventional liquid-cooled internal combustion engines do not adequately dissipate heat from high-temperature load regions, particularly in high-power engines, necessitating improved cooling solutions with minimal manufacturing effort.

Method used

The engine design incorporates a first and second block cooling jacket positioned on opposite sides of the cylinder liner, connected by a third flow transfer, with coolant flowing through these jackets and chambers in a top-down manner, ensuring efficient heat dissipation via multiple passages aligned laterally to the longitudinal engine surface.

Benefits of technology

This configuration achieves uniform and efficient cooling of both the cylinder head and cylinder block, particularly in high-heat-load regions, enhancing thermal management with a compact and effective cooling system.

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Abstract

The present invention relates to a cylinder head (2) with a top-down cooling concept, comprising a head cooling chamber (15) comprising a first head portion cooling chamber (16) spaced apart from a fire deck (4) and a second head portion cooling chamber (17) adjacent to said fire deck (4) of a cylinder head (2) and spaced apart from said first head portion cooling chamber (16) by an intermediate deck (18), wherein said first head portion cooling chamber (16) and said second head portion cooling chamber (17) are connected to a central conduit (18) by a flow passage (21) in said intermediate deck (18). the cylinder head (2) being fluidly interconnected in the region of the components (19) of the cylinder block (3), a main feed passage (32) arranged in the cylinder block (3) and connected to the first head section cooling chamber (16) by a first passage (34) in the fire deck (4) of the cylinder head (2) and by a supply passage (35), and a block cooling jacket (41) fluidly connected to the second head section cooling chamber (17) by a second passage (36) in the fire deck (4) of the cylinder head (2). According to the present invention, for improved cooling, the block cooling jacket (41) comprises a first block portion cooling jacket (29) in the vicinity of the fire deck (4) and communicating with the second flow passage (36), and a second block portion cooling jacket (30) spaced apart from the first block portion cooling jacket (29) and remote from the fire deck (4), the first block cooling jacket (29) being fluidly connected to the second block portion cooling jacket (30) by a third flow passage (37) diametrically opposed to the second flow passage (36), and the second block portion cooling jacket (30) being connected to a main discharge flow passage (33) located in the cylinder block (2).
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