JPH0192556A - Cylinder head gasket for inspection - Google Patents

Abstract

PURPOSE:To provide a gasket enabling the condition of pressure, temperature or the like applied thereto to be easily measured, by forming soft metal layers on both surfaces of a sheet-like metal core to provide a sheet material provided with a hole similar to usual one. CONSTITUTION:This inspection gasket is constituted from a sheet material 11 formed on both surfaces of a sheet-like metal core 2 of iron plate or metal guaze having hooks with soft metal layers 10, 10 of lead, aluminum or the like. This sheet material 11 similarly to usual cylinder head gaskets 1 is provided with bores 5 aligned with openings on the top of cylinders, small circular holes 6 for inserting fastening bolts and through holes 7 for letting lubricating oil and cooling water flow therethrough. In inspection, an engine is run with the inspection gasket being sandwiched between a cylinder block and a cylinder head. Then, an amount of crushed soft metal layer 10 is then measured to detect temperature and press force applied to each portion.

Description

Detailed Description of the Invention a. Object of the Invention (Field of Industrial Application) The cylinder head gasket for inspection according to the present invention is sandwiched between the upper surface of the cylinder block of an engine and the lower surface of the cylinder head, and is airtight between both surfaces. It is used in place of the cylinder head gasket to maintain fluid tightness, and is used to detect weak parts of the cylinder head gasket or engine.

(Prior Art) A cylinder head gasket for maintaining airtightness and liquidtightness between the upper surface of a cylinder block and the lower surface of a cylinder head of an engine is constructed, for example, as shown in FIG. 2.

This cylinder head gasket 1 has an inorganic material such as asbestos on both sides of a metal plate-shaped core material 2 such as an iron plate with hooks.
Alternatively, gasket material 3.3 mainly composed of carbon or the like is laminated to form a gasket sheet 4, and this gasket sheet 4 has a circular bore hole 5.5 matching the opening shape of the top of the cylinder, and the cylinder head is connected to the cylinder block. It consists of a small circular hole 6.6 through which a bolt for fixing is inserted, and a through hole 7.7 through which cooling water and lubricating oil pass. Reference numeral 8 denotes a grommet made of a thin metal plate attached to the inner peripheral edge of each bore hole 3.3, and in the illustrated example, the adjacent bore hole 5.5
The grommets 8.8 mounted on the grommets 8.8 are connected to each other via a connecting portion 9.9.

Each grommet 8.8 is connected to each bore hole 5 as shown in FIG.
．． 5, the compression resistance (strength against compression force) of the cylinder head gasket 1 at this peripheral edge is greater than other parts, and this cylinder head gasket 1 is attached to the cylinder head gasket 1. When a strong pressure is applied between the upper surface of the block and the lower surface of the cylinder head, the pressing force generated within the cylinder is particularly large at the peripheral edge of each bore hole 5.5, which requires a particularly high degree of airtightness. This is intended to prevent high-pressure combustion gas from leaking to the outside.

Although not shown in the drawings, in order to further ensure airtightness around the bore hole, a grommet 8 is attached to the inner peripheral edge of the bore hole 5.5 formed in the gasket sheet 4, and a grommet 8 attached to this inner peripheral edge. In some cases, an endless annular wire ring with a circular cross section is interposed between the inner peripheral surface of the wire and the inner circumferential surface of the wire.

Furthermore, eyelets similar to grommets are installed on the peripheral edges of the through holes 7.7 through which lubricating oil and cooling water flow, and each through hole 7.7
The liquid-tightness of the peripheral portion is ensured, or the gasket material 3 constituting the gasket sheet 4 is prevented from being mixed into lubricating oil or cooling water.

(Problems to be Solved by the Invention) However, when the cylinder head gasket 1 is strongly clamped between the upper surface of the cylinder block and the lower surface of the cylinder head, the conditions are not the same over the entire surface of the cylinder head gasket 1. It is inevitable that conditions such as temperature and pressing force will differ for each part.

Therefore, it is preferable to appropriately select the material or thickness of the cylinder head gasket 1 for each engine in order to maintain good airtightness and liquid tightness between the upper surface of the cylinder block and the lower surface of the cylinder head. Conventionally, it has been difficult to measure conditions such as the pressure and temperature applied to the cylinder head gasket 1, which is held between the top surface of the cylinder block and the bottom surface of the cylinder head, and it has been difficult to measure the conditions such as the pressure and temperature applied to the cylinder head gasket 1, which is difficult to measure when selecting the gasket material 3 that makes up the cylinder head gasket 1 and the cylinder head gasket 1. head gasket 1
Determination of the thickness of the material had to be done based on intuition or trial and error, and it was not always possible to find the optimum conditions.

Also, when an engine is operating, it is unavoidable that the temperature and degree of temperature rise will differ for each part of the cylinder block and cylinder head, but if the temperature difference between each part is too large,
Various inconveniences may occur, such as deterioration of the durability of various parts of the engine, and the design of the engine must be changed, such as by changing the arrangement of the water jacket. It was difficult to perform this on parts that are not exposed to the surface during engine operation, such as the peripheral edge of the bore hole 5.5.

The inspection cylinder head gasket of the present invention eliminates the above-mentioned disadvantages.

b1 Structure of the Invention (Means for Solving Problems) As shown in FIG. 1, the inspection cylinder head gasket of the present invention has a core material 2 made of metal and a thin plate, such as an iron plate with a hook or a wire mesh. A sheet material 11 is formed by forming layers 10.10 of soft metal such as lead or aluminum on both sides of the cylinder head gasket 10, and a layer 10.10 of a soft metal such as lead or aluminum is formed on both sides of the sheet material 11. A bore hole 5.5 that matches the opening shape, a small circular hole 6.6 for inserting the bolt to fix the cylinder head to the cylinder block, and a through hole 7.7 for passing lubricating oil and cooling water are drilled. It consists of things to do.

Grommets 8.8 or eyelets may be attached to the periphery of the bore hole 5.5 and the periphery of the through hole 7.7, as in the case of a normal cylinder head gasket 1, but depending on the conditions of use (
Depending on the object to be inspected, the grommet 8.8 or eyelet may be omitted, and instead the thickness of the grommet 8.8 or eyelet may be made slightly thicker around the bore hole 5.5 or through hole 7.7 than in other areas. It is also possible to make it thicker.

Moreover, a wiring is attached to the inside of the grommet 8.8 as necessary.

(Function) When performing measurement work to obtain the optimum combination of engine and cylinder head gasket using the cylinder head gasket for inspection of the present invention configured as described above, the upper surface of the cylinder block and the lower surface of the cylinder head In place of the normal cylinder head gasket 1 as shown in FIG. 2, a cylinder head gasket for inspection of the present invention is sandwiched between the cylinder head gasket 1 and the cylinder head gasket 1 shown in FIG. 2, and the engine is operated for a predetermined period of time.

Since the surface of the inspection cylinder head gasket of the present invention is made of lead, which is a soft metal with a low melting point, the inspection cylinder head gasket is sandwiched between the top surface of the cylinder block and the bottom surface of the cylinder head. When the engine is operated, the soft metal layer 10.10 forming the surface of the cylinder head gasket for inspection is crushed (
The amount by which the soft metal layer 10.10 is crushed in this way varies depending on the temperature and pressing force applied to each part.

In other words, the higher the temperature of the upper surface of the cylinder block or the lower surface of the cylinder head, or the stronger the pressing force, the greater the amount of soft metal layer 10.10 crushed. If you take out the cylinder head gasket for inspection of the present invention that has been clamped between the lower surface and exposed to the heat associated with engine operation, measure the thickness of each part, and compare it with the thickness before clamping, it will be possible to determine whether the cylinder head is It can be used as a reference when designing gaskets and engines.

In addition, a grommet 8 is attached to the periphery of the bore hole 5.5 and the through hole 7.7.
．． If grommet 8.8 or eyelet is installed, it is convenient for measuring the parts where the strength of the cylinder head gasket is weakened.If grommet 8.8 or eyelet is not installed, it is convenient to measure the weak parts of the engine itself such as detecting heat spots. This is convenient when measuring parts.

In addition, using lead as the material constituting the soft metal layer 10.10 is suitable for inspecting parts with relatively small pressing force, and using aluminum is suitable for inspecting parts with relatively small pressing force. This is suitable for inspecting large areas. Furthermore, depending on the magnitude of the pressing force or the content to be inspected, the soft metal constituting the layer 10.10 of the cylinder head gasket for vehicle inspection may be lead, aluminum, or It is also possible to make them different.

C9 Effects of the Invention The inspection cylinder head gasket of the present invention is configured and operates as described above, so that the design of cylinder head gaskets and engines, which had conventionally been based on intuition and execution error, can now be designed based on measured values. This will make it easier to design the optimal cylinder head gasket and engine under given conditions.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an inspection cylinder head gasket of the present invention, FIG. 2 is a plan view showing an example of a normal cylinder head gasket, and FIG. 3 is an enlarged AA sectional view of FIG. 2. . 1 Nijilinda gasket, 2: Core material, 3: Gasket material, 4: Gasket sheet, 5: Bore hole, 6: Small circular hole, 7: Through hole, 8: Grommet, 9: Connection part, 10:
Soft metal layer, 11: sheet material. Patent applicant: Japan Line Co., Ltd. Agent: Kinzo Koyama (and one other person) Figure 3

Claims (1)

[Claims] (1) A sheet material with soft metal layers formed on both sides of a thin metal core material is provided with a bore hole that matches the opening shape of the top of the cylinder, and a cylinder head is attached to the cylinder block. A cylinder head gasket for inspection that has small holes for inserting fixing bolts and through holes for passing lubricating oil and cooling water. (2) The cylinder head gasket for inspection according to claim 1, wherein the soft metal is lead. (3) The cylinder head gasket for inspection according to claim 1, wherein the soft metal is aluminum. (4) Claim 1, wherein the soft metal layer is divided into an aluminum part and a lead part in the plane direction.
Cylinder head gasket for inspection.