JPH09195814A - Cylinder head gasket with sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect directly the oscillation generated in a cylinder, by forming a holding hole to the peripheral part of a bore hole of a cylinder head gasket, where a sensor is housed, and drawing out a signal cable from a passage formed on the outer peripheral edge of the cylinder head gasket to the outer side. SOLUTION: A cylinder head gasket 5 is composed by laminating front plates 1 and 2, and middle plates 3 and 4, and a bore hole 6 is formed at the position matched to the cylinder hole of a cylinder block. In this case, a notching 10 is formed to a part positioning to the peripheral edge of the bore 6, at a part of the front plate 1. And a holding hole 11 is formed at the position conforming to a part of the notch 10 at the parts of the middle plates 3 and 4, and a recessed groove 12 to communicate the outer peripheral edge of the middle plate 4 and the holding hole 11 on one side surface of the middle plate 4 and opposing to the middle plate 3. And a sensor 13 to detect a knocking is housed to the holding hole 13, and a cable 14 connected to the sensor 13 is picked out to the outer side of the cylinder head gasket 5, through the recessed groove 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The sensor-equipped cylinder head gasket according to the present invention detects knocking occurring in the cylinder of a gasoline engine by incorporating a knock sensor in the cylinder head gasket.

[0002]

2. Description of the Related Art Knocking, which is abnormal combustion in a cylinder of a gasoline engine, occurs when end gas is ignited before combustion by a plug is spread in the cylinder. When such knocking occurs, a sharp metal sound is generated in the cylinder, which not only makes the occupant uncomfortable, but also the pressure and heat load in the cylinder increase abnormally. For this reason, if knocking continues to occur as it is, it may cause overheating and further damage or seizure of the piston.

For this reason, conventionally, a gasoline engine is provided with a sensor for detecting the occurrence of knocking, which is called a knock sensor. When this sensor detects the occurrence of knocking, the ignition timing of the engine is delayed. ing. Conventionally, such a sensor has been fixed to the cylinder block of the engine. When knocking occurs in the cylinder, a unique vibration (having an engine-specific frequency) accompanying the knocking is transmitted to the cylinder block, and the sensor detects this vibration. Then, based on the signal sent from this sensor, the controller delays the ignition timing of the engine. If the sensor no longer detects knocking, reset (advance) the ignition timing.

[0004]

Conventionally, since a sensor is attached to the cylinder block, the knocking detection accuracy is not always sufficient. That is, when knocking occurs, first, the gas in the cylinder vibrates violently, and this vibration is transmitted to the cylinder block, and the cylinder block vibrates. In the case of the conventional structure, the vibration transmitted to the cylinder block was detected in this way, so there is a slight time lag between the time when knocking occurs and the time when the sensor detects it. Not only that, but it was not possible to detect a small abnormal vibration that occurs in the early stage of knocking. If you can directly detect the vibration of the gas in the cylinder, you can solve these problems all at once.
Conventionally, a structure capable of directly detecting such vibration of gas has not been known. The cylinder head gasket with a sensor of the present invention was invented in view of such circumstances. By realizing a structure in which the vibration of gas generated in the cylinder can be directly detected, the ignition timing is shifted based on knocking. It is to improve the responsiveness at the time of contact.

[0005]

A cylinder head gasket with a sensor according to the present invention is a part of a cylinder head gasket which is sandwiched between an upper surface of a cylinder block and a lower surface of a cylinder head and seals between these surfaces. A holding hole communicating with the inner peripheral edge of the bore hole is formed in the peripheral portion of the bore hole aligned with the cylinder hole opened on the upper surface of the cylinder block. Then, the sensor is housed in the holding hole, and a cable for taking out a detection signal of the sensor is drawn out of the cylinder head gasket through a passage that connects the holding hole and the outer peripheral edge of the cylinder head gasket.

[0006]

According to the cylinder head gasket with a sensor of the present invention constructed as described above, the vibration of the gas generated in the cylinder can be directly detected. Therefore, it is possible to improve the responsiveness when shifting the ignition timing based on, for example, knocking.

[0007]

1 to 9 show an example of an embodiment of the present invention. In this example, the present invention is applied to a so-called metal cylinder head gasket in which a plurality of metal plates are laminated. Cylinder head gasket 5 of this example
Is configured by laminating four metal plates, which are a first surface plate 1, a second surface plate 2, a first intermediate plate 3 and a second intermediate plate 4. A bore hole 6 is formed at a position where these plates 1 to 4 are aligned with each other and a position where they are aligned with a cylinder hole opened on the upper surface of the cylinder block during use. In addition to the bore hole 6, water holes 7, 7 for circulating cooling water, an oil hole for circulating lubricating oil, and a cylinder block at positions where the plates 1 to 4 are aligned with each other. Bolt holes (oil holes and bolt holes are not shown) for inserting bolts for connecting the cylinder head and the cylinder head.

Of the plates 1 to 4, the first surface plate 1 exposed on one surface (the upper surface of FIGS. 2 to 4) of the cylinder head gasket 5 and the other surface (the lower surface of FIGS. 2 to 4) are also exposed. A part of the second surface plate 2 that surrounds the bore hole 6 is formed with a first ridge 8 so that the peripheral portion of the bore hole 6 can be kept airtight. ing. Further, a second ridge 9 is formed at a position surrounding the water holes 7, 7 in a part of the both surface plates 1, 2 so that the cooling water flowing in each of the water holes 7, 7 is cooled. It is designed to prevent leakage. In addition, the second ridge 9 is formed around the water holes 7 and 7,
Each 7 may be formed independently. Further, a U-shaped notch 10 is formed in a portion of the first surface plate 1 located at the peripheral portion of the bore hole 6 in a state of opening to the inner peripheral edge of the bore hole 6. ing. A part of the first protrusion 8 facing the notch 10 is the notch 1
It is diverted outward in the diametrical direction so as to avoid 0. Therefore, when the cylinder head gasket 5 is sandwiched between the upper surface of the cylinder block and the lower surface of the cylinder head, the high temperature combustion gas generated in the cylinder enters the notch 10 without any hindrance. .

On the other hand, the first intermediate plate 3 and the second intermediate plate 4 sandwiched between the both surface plates 1 and 2 have a flat plate shape as a whole without forming a ridge or the like. ing. A circular holding hole is formed at a part of the first intermediate plate 3 and the second intermediate plate 4 at a position around the bore hole 6 and aligned with a part of the notch 10. 11, 1
1 is formed. Further, the outer peripheral edge of the second intermediate plate 4 and the holding surface are provided on the surface of the second intermediate plate 4 facing the first intermediate plate 3 on one surface (the upper surface of FIGS. 2, 4, 5). Hole 11
A recessed groove 12 is formed to communicate with.

Then, a sensor 13 for detecting knocking is housed in the holding holes 11 and 11, and this sensor 13
The cables 14, 14 having one end thereof connected to the cylinder head gasket 5 are taken out through the recessed groove 12. As the cable 14, in addition to ordinary conductors, any member such as an optical fiber capable of transmitting signals can be used.

As shown in FIG. 5, a sealing material 15 such as foamed rubber is attached to a portion of one surface (the lower surface in FIG. 5) of the first intermediate plate 3 facing the groove 12. There is. In a state where one surface of the first intermediate plate 3 and one surface of the second intermediate plate 4 are in close contact with each other, the sealing material 15 is crushed and enters the concave groove 12, and the concave groove 12 The gap between the inner surface and each of the cables 14 and 14 is closed. Therefore,
The high-pressure combustion gas that has entered the holding holes 11, 11 through the notch 10 does not leak through this gap. At the same time, the cooling water flowing in the water holes 7, 7 and the lubricating oil flowing in the oil hole (not shown) are filled with the concave groove 12 described above.
It can be effectively prevented from leaking to the outside through. Particularly, in the case of the illustrated embodiment, the concave groove 12 is arranged at the mating surface portion between the first intermediate plate 3 and the second intermediate plate 4, and the first protrusion 8 and the second protrusion are arranged. Since the strip 9 is brought into contact with the surface of each of the intermediate plates 8 and 9 on which the recessed groove 12 is not formed, even if the recessed groove 12 crosses each of the protruding strips 8 and 9, both of these projections The sealability can be maintained by the Articles 8 and 9.
The first ridges 8 and the second ridges 9 are used instead of being formed on the first face plate 1 and the second face plate 2 (or the first face plate 1 and the second face plate 2). Of the surface plate 2 of),
It can also be formed on one or both of the first intermediate plate 3 and the second intermediate plate 4.

According to the cylinder head gasket with a sensor of the present invention constructed as described above, the vibration of gas generated in the cylinder can be directly detected. Therefore, it is possible to improve the responsiveness when shifting the ignition timing based on the presence or absence of knocking. That is, when knocking occurs in the cylinder and the gas in the cylinder abnormally vibrates, this vibration is transmitted to the sensor 13 held in each of the holding holes 11 through the notch 10. Then, the sensor 13 directly detects the vibration of the gas in the cylinder. Therefore, as compared with the case where the sensor is supported on the cylinder block, the knocking detection accuracy is dramatically improved.

In the above description, the case where the sensor 13 incorporated in the cylinder head gasket 5 is a knock sensor has been described, but the sensor 13 does not necessarily have to be a knock sensor. That is, the present invention can be applied to the assembly of various sensors that detect various abnormal phenomena occurring in the cylinder of the engine.

[0014]

Since the cylinder head gasket with a sensor of the present invention is constructed and operates as described above, it can promptly and reliably detect the occurrence of an abnormal phenomenon such as knocking,
Measures against abnormal phenomena such as adjustment of ignition timing can be performed without delay. As a result, the operating condition of the engine can be controlled more appropriately to prevent overheat and extend the life of the engine.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a cylinder head gasket with a sensor, showing an example of an embodiment of the present invention.

FIG. 2 is an enlarged AA sectional view of FIG.

FIG. 3 is an enlarged sectional view taken along the line BB in FIG.

FIG. 4 is an enlarged sectional view taken along line C-C of FIG.

FIG. 5 is a sectional view similar to FIG. 4, showing the first intermediate plate and the second intermediate plate in a state before being taken out and combined.

FIG. 6 is a plan view of a first face plate.

FIG. 7 is a plan view of a first intermediate plate.

FIG. 8 is a surface view of a second intermediate plate.

FIG. 9 is a plan view of a second face plate.

[Explanation of Codes] 1 First surface plate 2 Second surface plate 3 First intermediate plate 4 Second intermediate plate 5 Cylinder head gasket 6 Bore hole 7 Water hole 8 First protrusion 9 Second protrusion Article 10 Notch 11 Holding hole 12 Groove 13 Sensor 14 Cable 15 Sealing material

Claims (3)

[Claims] 1. A bore hole which is a part of a cylinder head gasket which is sandwiched between an upper surface of a cylinder block and a lower surface of a cylinder head and seals between the both surfaces, and which is aligned with a cylinder hole opened on the upper surface of the cylinder block. A holding hole that communicates with the inner peripheral edge of the bore hole is formed in the peripheral portion of, and a sensor for accommodating the sensor in the holding hole and taking out a detection signal of the sensor is connected to the holding hole and the cylinder head gasket. A cylinder head gasket with a sensor that is pulled out to the outside of the cylinder head gasket through a passage that communicates with the outer peripheral edge. 2. A first metal surface plate exposed on one surface of the cylinder head gasket, a second metal surface plate also exposed on the other surface, the second surface plate and the first surface plate. The first intermediate plate and the second intermediate plate made of metal, respectively, sandwiched between the surface plate and the first intermediate plate and the second intermediate plate, and the first intermediate plate and the second intermediate plate A bore hole formed at a position aligned with each other and at a position aligned with a cylinder hole opened on the upper surface of the cylinder block during use, and a state where a part of the first surface plate is opened at the inner peripheral edge of the bore hole. A notch formed by the above, and a holding formed at a position that is located in the peripheral portion of the bore hole by a part of the first intermediate plate and the second intermediate plate and that is aligned with a part of the notch A hole, which is formed on one surface of the second intermediate plate and which holds the outer peripheral edge of the second intermediate plate and Cylinder with sensor provided with a concave groove communicating with the holding hole, a sensor housed in the holding hole, and a cable connected to the sensor at one end thereof and taken out to the outside of the cylinder head gasket through the concave groove. Head gasket. 3. A state in which a sealing material is attached to a portion of one surface of the first intermediate plate facing the concave groove, and one surface of the first intermediate plate and one surface of the second intermediate plate are in close contact with each other. 3. The sealing material enters into the groove to close the gap between the inner surface of the groove and the cable, and prevents combustion gas in the cylinder hole from leaking through the gap. Cylinder head gasket with sensor.