WO2017111760A1

WO2017111760A1 - Multilayered engine design

Info

Publication number: WO2017111760A1
Application number: PCT/TR2016/050528
Authority: WO
Inventors: Deniz Can UNAL; Arda YALCIN; Demirhan MANAV
Original assignee: Ford Otomotiv Sanayi A.S.
Priority date: 2015-12-23
Filing date: 2016-12-23
Publication date: 2017-06-29
Also published as: TR201516709A2

Abstract

The present invention relates to a multilayered engine design (1), which enables the parts subjected to high temperature in internal combustion engines to be cooled in an effective way, essentially comprising at least one main metal (6) which forms the structures such as cylinder block (3) and cylinder head (2), at least one combustion chamber (7) wherein the burning of the fuel is realized, at least one water jacket (4) which is provided in the main metal (6), and which is in form of a channel through which the engine coolant passes, and at least one interlayer (5) which covers the walls of the water jacket (4) and increases its heat transfer.

Description

MULTILAYERED ENGINE DESIGN

DESCRIPTION

Field of the Invention

The present invention relates to a superior multilayered engine design which improves the rate of cooling applied on the inner surface of the water jacket in order to effectively cool the parts such as cylinder block and cylinder head that are subjected to high temperature and material fatigue in internal combustion engines.

Background of the Invention

In internal combustion engines, the fuel is mixed with the air that is sucked in the combustion chamber which is the volume between the cylinder head, cylinder block and the piston, and it is burnt there, therefore the energy is converted into kinetic energy. A great amount of heat is released during burning of the fuel, and this heat is required to be removed from the medium. The parts such as cylinder head and the cylinder block forming the combustion chamber are directly subjected to the high temperature generated during combustion. One of the most important problems experienced by these parts that are generally produced by using cast iron or aluminum is the breaks or cracks due to thermos -mechanic fatigue originating from high and variable temperature. In order to prevent the high temperature generated as a result of combustion in internal combustion engines from damaging the engine parts such as cylinder head or cylinder block, the heat is discharged by passing a coolant from a space called water jacket in these parts. The heat transition in the combustion chamber minimizes the negative effects of the high temperatures generated as a result of combustion on the said parts with the coolant flowing at high speed through the water jacket. The water jacket is formed by removing the cores used during casting process from the parts after casting. The dimensions of the water jacket are limited due to the wall thickness determined so that the said parts preserve their strength against engine operating conditions. For this reason, in several cases when the engine operates at high speed and under high load, the circulation of the coolant in the said parts is not sufficient, and serious engine failures can occur as a result of experiencing deteriorations in mechanic features of the parts with thermo- mechanic breaks and/or cracks. Today, one of the important matters which is studied by the engine development engineers is the solution developed for this problem.

United States Patent document no US7798108, an application known in the state of the art, discloses an internal combustion engine having a water jacket. The cooling of the engine is provided by passing coolant through the jacket surrounding the cylinders.

The Objective of the Invention The objective of the present invention is to provide a water jacket design in a superior multilayered structure which enables parts such as cylinder head and cylinder block which are among the critical parts of the engine in internal combustion engines to be cooled more effectively. Another objective of the present invention is to improve heat transfer of the combustion heat to the coolant with a layer the heat transfer coefficient of which is quite high and added between the present water jacket and the main metal.

A further objective of the present invention is to prevent the metal temperature of the main material to get close to the upper limit, and increase and accelerate the heat transfer to the cooling system. Detailed Description of the Invention

A multilayered engine design developed to fulfill the objectives of the present invention is illustrated in the accompanying figures, in which:

Figure 1 is the view of an inventive multilayered engine design.

Figure 2 is the cross-sectional view of an inventive multilayered design.

The components shown in the figures are each given reference numbers as follows:

1. Multilayered engine design

2. Cylinder head

3. Cylinder block

4. Water jacket

5. Interlayer

6. Main metal

7. Combustion chamber

A multilayered engine design, which enables the parts subjected to high temperature in internal combustion engines to be cooled in an effective way, essentially comprises

at least one main metal (6) which forms the structures such as cylinder block

(3) and cylinder head (2),

at least one combustion chamber (7) wherein the burning of the fuel is realized, at least one water jacket (4) which is provided in the main metal (6), and which is in form of a channel through which the engine coolant passes, at least one interlay er (5) which covers the walls of the water jacket (4) and increases the heat transfer.

The material of the interlayer (5) which is applied has a higher heat transfer coefficient than the material of the main metal (6). A metal with high heat transfer coefficient such as copper is used for the interlayer (5) developed in a preferred embodiment of the invention. The use of metal for interlayer (5) material is required so that thermal expansion difference do not occur between the main metal (6) and the interlayer (5).

In a preferred embodiment of the invention, the interlayer (5) is manufactured by being applied between the water jacket (4) and the main metal (6) with cold plasma method after the main metal (6) is manufactured by casting.

By means of the invention which is developed, heat transfer of the combustion heat to the coolant is improved with a layer the heat transfer coefficient of which is quite high and added between the present water jacket and the main metal. The heat transfer coefficient of the material used in the interlayer (5) that is developed is quite higher than the heat transfer coefficient of the main metal (6) of the said parts. The multilayered structure which is obtained prevents the temperature of the main metal (6) to reach the upper limit by this means, and it increases and accelerates the heat transfer to the cooling. By this means, the water jacket (4) provided in the inventive multilayered engine design increases and accelerates the transfer of the heat generated with combustion to the cooling system, and thus it prevents the problems such as breaks, cracks and/or deterioration in mechanical features that can occur due to high and variant temperature in the said engine parts. The thickness of the interlayer (5) added in the application with high heat transfer coefficient is limited to the wall thickness that is required to provide fatigue strength required between the main metal (6) and the water jacket (4). In the application of the said interlayer (5), the thickness of the water jacket (4) is kept fixed. For this reason, the water jacket (4) core during casting process is manufactured as large as the thickness to be used for the interlayer (5). In order to form the interlayer (5) after casting process, the interlayer material with high heat transfer coefficient is coated inside the water jacket (4) with cold plasma method, and an environment which increases and accelerates the heat transfer between the water jacket (4) and the combustion chamber (7) is obtained.

Claims

A multilayered engine design (1), which enables the parts subjected to high temperature in internal combustion engines to be cooled in an effective way, essentially comprising

at least one main metal (6) which forms the structures such as cylinder block (3) and cylinder head (2),

at least one combustion chamber (7) wherein the burning of the fuel is realized,

at least one water jacket (4) which is provided in the main metal (6), and which is in form of a channel through which the engine coolant passes, and characterized by

at least one interlayer (5) which covers the walls of the water jacket (4) and increases the heat transfer.

A multilayered engine design (1) according to claim 1, characterized by interlayer (5) which is manufactured from a material having a heat transfer coefficient higher than the material of the main metal (6).

A multilayered engine design (1) according to claim 1, characterized by interlayer (5) which is manufactured by being applied between the water jacket (4) and the main metal (6) with cold plasma method after the main metal (6) is manufactured by casting.