JPH0617702A - Cylinder head gasket for internal combustion engine - Google Patents

Abstract

PURPOSE: To provide a cylinder head gasket held on a temperature-sensing member that can measure as accurate as possible an engine temperature in, particularly, a critical load region. CONSTITUTION: In a cylinder head gasket 1 of an internal combustion engine, one or more supports 5 arranged in a region to which a load is applied during operation are formed as temperature-sensing members particularly in a wave region 4 between two adjacent combustion chamber openings 2, and in a critical load location thereof, a temperature of the engine is monitored and controlled so as to ensure prevention of the engine from harmful overheating by supplying a coolant.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to two or more combustion chamber openings juxtaposed in series and a support or sheet metal which is mounted on a gasket in a critical area as a means used to increase the sealing pressure. The present invention relates to a cylinder head gasket of an internal combustion engine including:

[0002]

In a cylinder head gasket for an internal combustion engine having combustion chamber openings juxtaposed in series,
The most loaded gasket areas, in particular the web areas between adjacent combustion chamber openings, are reinforced with supports on one or both sides of the polymeric material or with a metal plate mounted on them, the sealing pressure in these areas thus being It is known to increase the sealing effect. Correspondingly, the engine block or the members of the cylinder head that rest on the reinforced area of the cylinder head gasket are exposed to heavy loads, in particular the web area of the heavily loaded engine block between two combustion cylinders is overheated. It's easy to do.

At the same time, the temperature sensing member constantly measures the temperature in order to monitor the combustion process in the cylinders of the internal combustion engine and thus to detect the irregularity of the combustion process produced by knocking during engine operation. It is also known to electronically analyze for control of the combustion process.

In this case, for example, West German Laid-Open Patent Publication No. 2
According to No. 932386, a temperature sensing member is provided in a hole in the cylinder wall of a combustion cylinder and is described in West German Patent No. 30.
According to 06603, since the thermocouple is provided just below the metal frame of the cylinder head gasket at the edge of the combustion chamber, irregularities in the combustion process are detected and compensated individually for each cylinder. be able to.

[0005]

However, in such an arrangement, the temperature-sensing members must be provided in the combustion chamber cylinder with little protection, so that they are exposed to large temperature changes. , Consumes relatively quickly. Further, depending on the arrangement configuration in which the temperature sensing member is provided at the edge of the combustion chamber, it is possible to measure and monitor only the combustion progress, but it is impossible to overheat the engine.

The object of the present invention is to provide a cylinder head gasket according to the preamble of the main claim, which carries a temperature-sensing member which enables the engine temperature to be measured as accurately as possible, especially in critical load areas. Through the measured temperature, the coolant supply, and thus the engine cooling, should be able to be adjusted to a temperature as constant as possible, especially in critical areas. It should be possible to equip the cylinder head gasket with a temperature-sensing member as simply and inexpensively as possible without the functional properties of the gasket being significantly impaired.

[0007]

SUMMARY OF THE INVENTION For this purpose, at least one of the supports is formed as a temperature-sensing member, the temperature-sensing member having an outwardly extending lead wire and a ground wire. This is achieved by the cylinder head gasket described in the preamble of the main claim.

Moreover, at least one of the web plates in the web area of the cylinder head gasket between the combustion chamber openings is formed as a temperature sensing element as a support on the cylinder head gasket which increases the sealing pressure. Is convenient.

The temperature sensing member is a thermocouple by being made up of two or more metal plates made of various members forming a thermocouple, electrically insulated from each other and connected to each other at their contact points. You can Similarly, the support formed as a temperature sensing member can be an electrical resistance thermometer by being made of a metal whose electrical resistance varies with temperature.

In this case, in the present invention, the support or the metal plate used as the temperature sensing member can also be divided into two halves which are spaced apart from one another, the gap being the original temperature. The sensing member is mounted protected from harmful external influences. Further, the temperature sensing member is electrically insulated from the outside. This can be done by encapsulating in an insulating foil or embedding it in an injected resin material. The connecting wire extending from the temperature sensing member is an insulated wire or a conductive path formed by applying a screen printing to a conductive material.

According to the invention, it is now possible to measure the engine temperature during engine operation by means of a simple and economically feasible measure and to control the coolant supply for cooling in accordance with the measurement results, especially in the critical load area. Is. This has the advantage that the refrigerant supply is interrupted until the critical temperature is reached in the hottest engine zone, especially during the warm-up phase. The engine is protected from overheating and at the same time is protected from destruction by it.

By virtue of the fact that the temperature-sensing member preferably consists of a support originally provided on the gasket, no new component is used on the cylinder head gasket, the functional properties of the gasket being impaired at best by the construction according to the invention. I can't. Also, the gasket itself can be made easily and economically.

The measurement results can be sent from the measuring point via lead wires, optionally directly to an electronic analysis device, from which the coolant flow for the temperature control of the engine can be controlled.

In principle, in particular for relatively small cylinder head gaskets, it is sufficient to attach only one temperature-sensing member to one of the gasket's web sections.

However, in accordance with the present invention, a plurality of temperature sensing members can be disposed on a single cylinder head gasket, depending on the application, at some or all web areas of the gasket, or at other critical locations. It is also possible to provide a temperature sensing member. If needed,
The coolant flow can be individually guided directly to the critical measuring point.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to five drawings.

FIG. 1 shows a cylinder head gasket 1 having four combustion chamber openings 2 juxtaposed side by side in series and an opening 3 for fixing screws, refrigerant and lubricant. In the web area 4 of the gasket 1 between the combustion chamber openings 2 a web plate 5 is arranged for increasing the sealing pressure. At the same time, these web plates are formed as the temperature-sensing member 5 and have the junction between the lead wire 6 and the ground wire 7.

2 and 3, the web plate 5 is formed as a thermocouple. The thermocouple, according to the sectional view shown in FIG. 3, is made of various metals forming the thermocouple,
It is composed of two metal plates 8 and 9 which are vertically stacked. These metal plates are connected to each other at a connection point 10 by soldering. These metal plates are electrically insulated from each other and to the outside by an insulating foil 11 placed on the middle and both sides. Since the upper metal plate 8 is connected to the lead wire 6 and the lower metal plate 9 is connected to the ground wire 7, the temperature can be electrically measured and analyzed through the generated electromotive force.

In the plan view of FIG. 4, the web plate 5 is divided into two web plate halves 5a, 5b which are spaced apart from each other, and in the gap between the two web plate halves 5a, 5b. , A commercially available thermocouple 12 having a lead wire 6'and a ground wire 7'is provided. In this way, the thermocouple 12 is protected against mechanical overload, while only the web plate halves 5a, 5b provide a measure to increase the sealing pressure.

In FIG. 5, the temperature sensing member 13 is an electric resistance thermometer, and is composed of a metal wire 13 extending in a U shape whose resistance changes depending on temperature. The end of the metal wire 13 is connected to the lead wire 6 ″ and the ground wire 7 ″,
In the gap between the two web plate halves 5a ', 5b',
It is arranged similarly to the thermocouple 12 of FIG.

[Brief description of drawings]

FIG. 1 is a plan view of a cylinder head gasket equipped according to the present invention.

FIG. 2 is a plan view of a thermocouple used.

3 is a cross-sectional view of the thermocouple of FIG.

FIG. 4 is a plan view of another used thermocouple.

FIG. 5 is a plan view of an electric resistance thermometer used.

[Explanation of symbols]

 1 Cylinder Head Gasket 2 Combustion Material Openings 5, 12, 13 Supports 5a, 5b Metal Plate Half Piece 6 Lead Wire 7 Ground Wire

Claims (5)

[Claims] 1. An internal combustion engine with two or more combustion chamber openings juxtaposed in series, and a support lying on one or both sides in the critical load zone as a means used to increase the sealing pressure. In the cylinder head gasket, at least one of the supports (5, 12, 13) is formed as a temperature sensing member (5, 12, 13), and this temperature sensing member (5, 12, 13) Has a lead wire (6) and an earth wire (7) extending outwardly. 2. At least one of the supports used to increase the sealing pressure has two combustion chamber openings (2).
A cylinder head gasket according to claim 1, wherein the cylinder head gasket is formed as a temperature sensing member in the web area between. 3. At least one or more of the means (5) used to increase the sealing pressure is divided into two metal plate halves (5a, 5b) spaced apart from one another. And the original temperature sensing member (1
Cylinder head gasket according to claim 1 or 2, wherein (2, 13) are provided in the gap between the two metal plate halves (5a, 5b). 4. The cylinder head gasket according to claim 1, wherein the temperature sensing member (5, 12) is a thermocouple. 5. The cylinder head gasket according to claim 1, wherein the temperature sensing member (5, 12) is an electric resistance thermometer.