JPH05601Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for disposing a metal gasket in a joint structure such as a thermostat disposed part in a cooling water passage of an engine.

[Prior Art] Conventionally, for example, in a multi-cylinder engine, cooling water flows from a radiator through a pump and then through a water jacket in the cylinder block of the engine.
Furthermore, the cooling water passes through the intake manifold and returns to the radiator again, but at the joint between the passage formed in the intake manifold and the water outlet fitting in the cooling water passage through which the cooling water passes. is equipped with a wax-type thermostat (a valve that closes when the cooling water temperature is low and opens when the temperature rises).

A detailed explanation of how to install this thermostat is shown in FIG. 11. That is, as shown in FIG. 11, the intake manifold part 1 in which the opening of the cooling water passage part is formed and the water outlet fitting 2 are arranged so that their flanges face each other and the openings are aligned. Further, an annular recessed step 1A is formed at the opening edge of the intake manifold portion 1 on the surface facing the water outlet fitting 2. The flange portion of the thermostat 3 is fitted into it. As a result, the thermostat 3 is installed so as to be mounted in the cooling water passage.

After the thermostat 3 is fitted and installed, a soft sealing gasket 4' is interposed between the opposing surfaces of the intake manifold part 1 and the water outlet fitting 2, and then
By tightening the intake manifold part 1 and the water outlet fitting 2 with bolts, the thermostat 3 and the soft gasket 4' are held between the intake manifold part 1 and the water outlet fitting 2. . In this way, the joint of the thermostat 3 is sealed.

Note that the soft gasket refers to a gasket that uses an asbestos-based joint sheet as a base material, and has resin printed and adhered to a portion of both sides of the joint sheet.

[Problem to be solved by the invention] By the way, in the joint portion as described above, the step height of the recessed step portion 1A and the plate thickness of the thermostat 3 may differ, and in such a case, the soft gasket 4' This level difference is absorbed by the elasticity of the material.

However, since the soft gasket 4' is printed on both sides, there is a problem in that the cost is high.

Therefore, it may be possible to use metal gaskets for the above joints, which can reduce costs.
If a metal gasket is simply used at the joint, the difference in level cannot be sufficiently absorbed. For this reason, there is a problem that the thermostat 3 may become loose or may not be able to perform a sufficient sealing function.

Note that this problem is not limited to the arrangement joint of the thermostat as described above, but also occurs in the first member of the first member and the second member, which are arranged facing each other so as to align the respective holes. A recessed step is formed on the side edge of the hole on the surface facing the second member, and the end of the third member disposed to be mounted in the hole is fitted into the recessed step. By tightening the member and the second member, the first member and the second member
This occurs in a similar manner in a joint structure in which members are sandwiched.

The present invention was developed in view of these problems, and even if a metal gasket is used in the joint structure as described above, it will still provide a sufficient sealing function and will not fit into the recessed step of the first member. It is an object of the present invention to provide a metal gasket arrangement structure for a joint structure part in which a third member fitted into the joint structure is also prevented from wobbling.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the metal gasket arrangement structure of the joint structure of the present invention includes a first member and a first member disposed facing each other so as to align each hole. the second member in the first member of the second member;
A recessed step is formed on the side edge of the hole on the surface facing the member, and the end of the third member disposed to be mounted in the hole is fitted into the recessed step. By tightening the first member and the second member of
In the joint structure in which the third member is held between the first member and the second member, an opening approximately the same size as the hole is formed between the opposing surfaces of the first member and the second member. A metal gasket having a metal gasket is disposed such that its opening is aligned with the hole, and a bead for pressing an end of the third member is formed along the periphery of the opening of the metal gasket. , the bead is made up of a plurality of bead parts by partially cutting out appropriate places in the circumferential direction, and after the first member and the second member are tightened, the bead part is formed at the end of the third member. It is characterized by being configured to press.

[Operation] In the metal gasket arrangement structure of the joint structure of the present invention described above, the end of the third member is fitted into the recessed step of the first member, and then the opposing surfaces of the first member and the second member are fitted. A metal gasket is placed in between, and then
By tightening the first member and the second member, when the tightening is finished, the bead portion formed by partially cutting out the bead of the metal gasket presses the end of the third member.

[Example] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. Figures 1 to 5 show the metal gasket arrangement structure of the joint structure part as the first embodiment of the present invention. 2 is a partial sectional view showing the condition before the joint is tightened, FIG. 3 is a plan view of the metal gasket, and FIG. 4 is the figure 3. FIG. 5 is a sectional view taken along the - arrow in FIG. 3, and in FIGS. 1 and 2, the same reference numerals as in FIG.

Now, also in the case of the first embodiment, regarding the arrangement structure of the metal gasket at the joint structure between the passage part formed in the intake manifold and the water outlet fitting among the cooling water passages in the multi-cylinder engine. It is something. That is, the first,
As shown in Figure 2, an intake manifold portion (first member) 1 in which an opening for the cooling water passage portion is formed and a water outlet fitting (second member)
2 are arranged so that their flanges face each other and the respective opening holes are aligned, and a hole-side edge of the surface of the intake manifold portion 1 facing the water outlet fitting 2 is An annular recessed step 1A is formed, and in this recessed step 1A,
The flange portion of the thermostat 3 is fitted into it. This causes thermostat 3
is installed in the cooling water passage.

In this case, the step height s of the recessed step portion 1A and the plate thickness t of the thermostat 3 are different, and the recessed step portion 1A
The step height s is considerably larger than the plate thickness t of the thermostat 3.

Further, after the thermostat 3 is fitted, a sealing metal gasket 4 is installed between the opposing surfaces of the intake manifold portion 1 and the water outlet fitting 2, which has an opening 4B approximately the same size as the hole of the cooling passage. In this metal gasket 4, as shown in FIG. A stepped bead portion 400 is formed for holding down. That is, a stepped bead 40 for pressing the flange portion of the thermostat 3 is formed along the opening periphery of the metal gasket 4, and the stepped bead 40 is partially cut out at an appropriate position in the circumferential direction to form a plurality of grooves. It is composed of a stepped bead portion 400.

In this case, since the step height s of the recessed step portion 1A is considerably larger than the plate thickness t of the thermostat 3,
Each bead portion 400 is configured as a bead portion 400 with a high height (dimension).

Furthermore, as shown in Fig. 2, when the intake manifold portion 1 and the water outlet fitting 2 are tightened with bolts, the edge of the opening 4B of the metal gasket 4 will warp due to the original bending shape. , each step bead portion 400 is deformed so that these step bead portions 400 press against the flange portion of the thermostat 3.

In addition, as shown in FIGS. 3 to 5, another stepped bead 41 is formed at a slightly outer side of these stepped bead portions 400 and even the stepped bead 40, and the bent portion 41a on the outside of this stepped bead 41 serves as an air intake. The stepped bead 41 is in contact with the manifold portion 1, and the inner bent portion 41b of the step bead 41 is in contact with the water outlet fitting 2.

Therefore, the shape of this metal gasket 4 is
As shown in FIG.
The cross section of the metal gasket 4 taken along the arrow - in FIG. 3 is as shown in FIG. 5. In addition, the code|symbol 4A in FIGS. 3-5 is a bolt hole.

With the above configuration, the flange portion of the thermostat 3 is fitted into the recessed step portion 1A of the intake manifold portion 1, and then the metal gasket 4 is disposed between the opposing surfaces of the intake manifold portion 1 and the water outlet fitting 2. Then, the step bead 40 of this metal gasket 4 and each step bead portion 4
00 faces the flange portion of the thermostat 3. The bent portion 41a of the other step bead 41 of the metal gasket 4 abuts the intake manifold portion 1, and the other bent portion 41b abuts the water outlet fitting 2.

After that, when these intake manifold part 1 and water outlet fitting 2 are tightened with bolts, as shown in Fig. 2, the edge of the opening 4B of the metal gasket 4 will be bent due to the original bending shape. Each step bead part 4 so that it curves up.
00 deforms and presses the flange portion of the thermostat 3 with each stepped bead portion 400.

In this case, the step height s of the recessed step portion 1A is considerably larger than the plate thickness t of the thermostat 3, but even in this case, since the bead 40 is partially cut out, the height (dimension) A bead 40 having a high bead portion 400 can be easily made.

Furthermore, due to this tightening, other stepped beads 4
1 is also modified to provide a seal between the intake manifold section 1 and the water outlet fitting 2.

As a result, when the intake manifold part 1 and the water outlet fitting 2 are tightened, each stage bead part 40 of the metal gasket 4 is tightened.
While pressing down the thermostat 3 at 0, the other step bead 41 exerts a sufficient water-resistant sealing function at the joint part in the thermostat installation part.

6 to 10 show the metal gasket arrangement structure of the joint structure as a second embodiment of the present invention, FIG. 6 is a partial cross-sectional view showing the state before the joint is tightened, and FIG. 7 8 is a plan view of the metal gasket, FIG. 9 is a sectional view taken along the - arrow in FIG. 8, and FIG. It is a sectional view, and in FIGS. 6 to 10, the same reference numerals as in FIGS. 1 to 5 and 11 indicate the same parts.

Now, in this second embodiment, as shown in FIGS. 6 and 7, the step height s of the recessed step portion 1A and the thermostat 3
This is a case where the plate thickness t of the thermostat 3 does not differ much, and the step height s of the recessed step portion 1A is slightly larger than the plate thickness t of the thermostat 3. Therefore, as shown in Figs. The height (dimension) of each bead portion 400' of the bead 40' of the butt 4 is constructed so that it does not become very high.

Then, the metal gasket 4 is inserted between the intake manifold part 1 and the water outlet fitting 2, and the intake manifold part 1 and the water outlet fitting 2 are bolted together as shown in FIG. When tightened, each step bead portion 400' is deformed so that the edge of the opening 4B of the metal gasket 4 is warped due to the original bending shape.
0', the flange portion of the thermostat 3 is pressed.

In this case, although the step height s of the recessed step portion 1A and the plate thickness t of the thermostat 3 are approximately the same, the bead is partially cut out to form a plurality of bead portions 400'. Rigidity can be reduced, and as a result, sufficient linear seal pressure (surface pressure) can be ensured.

Note that the structure is not limited to a stepped bead partially cut out as in each of the above-mentioned embodiments, but a round bead with a rounded cross-sectional shape may be partially cut out to have a plurality of round bead parts. .

Further, the present invention is not limited to the arrangement joint part of the thermostat as described above, but also applies to A recessed step is formed on the side edge of the hole on the surface facing the second member, and the end of the third member disposed to be mounted in the hole is fitted into the recessed step. The present invention can be similarly applied to the case where a metal gasket is disposed in a joint structure in which a third member is sandwiched between the first member and the second member by tightening the member and the second member. .

[Effects of the invention] As detailed above, according to the metal gasket arrangement structure of the joint structure of the invention, the first member and the second member are arranged facing each other so that the respective holes are aligned. the second member in the first member of the
A recessed step is formed on the side edge of the hole on the surface facing the member, and the end of the third member disposed to be mounted in the hole is fitted into the recessed step. By tightening the first member and the second member of
In the joint structure in which the third member is held between the first member and the second member, an opening approximately the same size as the hole is formed between the opposing surfaces of the first member and the second member. A metal gasket having a metal gasket is disposed such that its opening is aligned with the hole, and a bead for pressing an end of the third member is formed along the periphery of the opening of the metal gasket. , the bead is made up of a plurality of bead parts by partially cutting out appropriate places in the circumferential direction, and after the first member and the second member are tightened, the bead part is formed at the end of the third member. Even if the metal gasket is used in the above-mentioned joint structure, especially where the step height of the recessed step is considerably larger than the end plate thickness of the third member, There is an advantage that the third member fitted into the recessed part of the first member can be prevented from wobbling while exhibiting a sufficient sealing function, and the step height of the recessed part and the plate thickness of the thermostat are Even if there is no difference, there is an advantage that the rigidity of the bead can be reduced and sufficient linear sealing pressure (surface pressure) can be ensured.

[Brief explanation of the drawing]

Figures 1 to 5 show the metal gasket arrangement structure of the joint structure as the first embodiment of the present invention. Figure 1 is a partial cross-sectional view showing the state before the joint is tightened, and Figure 2 is a partial cross-sectional view of the joint before tightening. 3 is a plan view of the metal gasket, FIG. 4 is a sectional view taken along the − arrow in FIG. 3, and FIG. 5 is a sectional view taken along the − arrow in FIG. A sectional view,
6 to 10 show the metal gasket arrangement structure of the joint structure as a second embodiment of the present invention, FIG. 6 is a partial cross-sectional view showing the state before the joint is tightened, and FIG. 7 8 is a plan view of the metal gasket, FIG. 9 is a sectional view taken along the - arrow in FIG. 8, and FIG. FIG. 11 is a partial sectional view showing a conventional gasket arrangement structure of a joint structure. 1...Intake manifold part (first member), 1A
... Concave step, 2 ... Water outlet fitting (second member), 3 ... Thermostat (third member), 4 ... Metal gasket, 4A ... Bolt hole, 4B ... Opening, 40 ,40',41...
Step bead, 400, 400'...Step bead part.

Claims (1)

[Scope of utility model registration request] A recessed step is formed on the side edge of the hole on the first member of the first member and the second member, which are arranged facing each other so as to align the respective holes. Then, by fitting the end of the third member disposed to be mounted in the hole into the recess and tightening the first member and the second member, the first member and a joint structure in which the third member is held between the second member, a metal gasket having an opening approximately the same size as the hole between the opposing surfaces of the first member and the second member. A bead for pressing the end of the third member is formed along the periphery of the opening of the metal gasket, and the bead is arranged so that its opening is aligned with the hole. A plurality of bead parts are formed by partially cutting out appropriate places in the direction, and the bead part is configured to press the end of the third member after the first member and the second member are tightened. It is characterized by having been. Metal gasket arrangement structure of joint structure.