Integrated exhaust manifold cooling jacket

Abstract

The present disclosure provides an integrated exhaust manifold cooling jacket. A system for an integrated exhaust manifold cylinder head is provided. In one example, an exhaust manifold for a vehicle includes: a plurality of exhaust runners coupling a plurality of cylinder exhaust outlet ports to an exhaust outlet port, the plurality of exhaust runners forming at least a first exhaust passage and a second exhaust passage at the exhaust outlet port; an upper cooling jacket positioned vertically above the first exhaust passage; a lower cooling jacket positioned vertically below the second exhaust passage; and a central cooling jacket positioned vertically below the first exhaust passage and vertically above the second exhaust passage.

Description

technical field [0001] The present specification relates generally to a cylinder head for a vehicle, and more particularly, to a cylinder head including an integrated exhaust manifold with a central cooling jacket. Background technique [0002] Exhaust manifolds for internal combustion engines can be exposed to high thermal loads. Exhaust manifolds integrated into the cylinder head, referred to as integrated exhaust manifold (IEM) cylinder heads, can be subject to particularly high thermal loads due to the heat transfer characteristics of the integrated design. For example, an IEM cylinder head may include an exhaust outlet port with one or more exhaust passages that is subjected to high thermal loads during operation of the vehicle. [0003] By incorporating a cooling jacket into the cylinder head, the thermal load on the integrated exhaust manifold and adjacent components can be reduced. The cooling jacket in which the coolant core is formed may reduce thermal stress on ...

AI Technical Summary

Problems solved by technology

Additionally, these temperatures will result in difficult seals, prone to cracking and transfer of excessive temperatures to the turbocharger flange

Additionally, stacked exhaust paths present challenges for coolant vapor management, as it is difficult to degas packages leading to all cooling jackets through a single degas port

If the vapor cannot be removed with the flow of the coolant, the resulting vapor entrapment can lead to localized boiling

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