JPH0232941Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The eyelet according to this invention is, for example, sandwiched between the upper surface of the cylinder block of an internal combustion engine and the lower surface of the cylinder head, and is used to maintain airtightness between both surfaces. It is attached to the inner periphery of the water hole or oil hole of the cylinder head gasket to maintain liquid tightness, and is used to maintain water and oil tightness around the periphery of each hole, or to prevent water or oil flowing inside each hole. It is used to narrow down the flow path.

(Prior Art) For example, a cylinder head gasket 1 as shown in FIG. 6 is used to maintain airtightness and liquidtightness between the upper surface of a cylinder block and the lower surface of a cylinder head of an engine. Such a cylinder head gasket 1 has a circular bore hole 3 that matches the opening shape of the top of the cylinder and has a grommet 2 made of a thin metal plate attached to the peripheral edge thereof, and a bore hole 3 for fixing the cylinder head to the cylinder block. Small circular holes 4, 4 for inserting bolts, and through holes 5, 5 for passing cooling water and lubricating oil are provided.

In such a cylinder head gasket, an eyelet 6 as shown in FIG. When the gasket 1 is strongly pressed, it prevents the gas from flowing in the inner circumferential direction of the through holes 5, 5 and reducing the inner diameter of each through hole 5, 5, and also prevents the gas from flowing around the through holes 5, 5. It is designed to maintain liquid tightness.

In addition, through holes 5 are provided to adjust the flow rate of lubricating oil, etc.
In some cases, an orifice-like aperture is provided inside. As such a diaphragm structure,
No. 32151 discloses a structure as shown in FIG. 11. That is, sealing materials 8, 8 are annularly provided on the upper and lower surfaces of a circular plate 7 having an outer diameter that matches the inner diameter of the through hole 5, and a liquid such as lubricating oil or cooling water is placed in the center of the circular plate. The flow rate is restricted by the throttle hole 9 of.

Furthermore, as a structure for adjusting the flow rate of lubricating oil, etc., structures as shown in FIGS. 12 and 13 have been considered. Among these, the structure shown in Figure 12 is
An eyelet 6 attached to the inner peripheral edge of the through hole 5 has a horizontal W-shaped cross section, and a circular plate 7 having an aperture hole 9 at the center is supported at the center of the inner peripheral surface of the eyelet 6. Also, the first
In the structure shown in FIG. 3, the peripheral portions of two annular plates 10, 10 having a larger diameter than the through hole 5 sandwich the area around the through hole of the gasket, and the central hole of both annular plates 10, 10 is Both ends of the circular tube 12 inserted through the tubes 11 and 11 are expanded, and the circular plates 10 and 10 are attached to the gasket, and the circular tube 12 narrows the liquid flow path.

(Problems to be Solved by the Invention) However, in the conventional eyelet and liquid flow channel constriction structures constructed as described above, the following disadvantages occur.

That is, when attaching the eyelet 6 having a horizontal U-shaped cross section as shown in FIG. The cylindrical portion 13 is inserted into the hole 5.
A is an inverted truncated conical diameter expander 1 as shown in FIG.
4 to expand the diameter into a flat shape, and then press between a flat upper die 15 and a lower die 16 as shown in FIG. 10 to form an eyelet 6 with a horizontal U-shaped cross section as shown in FIG. 7. Therefore, the number of man-hours required to attach the eyelet 6 is large, making the production of the cylinder head gasket 1 troublesome.

In addition, when narrowing the flow path inside the through hole 5 as shown in FIGS. 11 to 13, for example, in the structure shown in FIG. This necessitates a step of removing the seal, which makes the ring plate 7 provided with the sealing material 8 expensive, and the cylinder head gasket also expensive. Furthermore, in the case of the structures shown in FIGS. 12 and 13, the assembly work is troublesome and it is difficult to stabilize the quality.

The eyelet of the present invention eliminates the above-mentioned disadvantages.

b. Structure of the invention (means for solving the problem) The eyelet of the invention is constructed by caulking together a pair of halves, each of which has an outer diameter larger than the inner diameter of the through hole to which it is attached.

The first half has a substantially hat-like overall shape, and has a cylindrical portion on the inner peripheral edge of a ring-shaped base plate with a larger diameter than the through hole, and a cylindrical portion that is connected to the base portion of the cylindrical portion. A plate portion having a through hole in the center is provided at the opposite end.

On the other hand, the second half piece has a base plate substantially similar to the first half piece, and a fitting cylindrical part that fits externally into the cylindrical part of the first half piece is provided on the inner peripheral edge of the base plate part. There is.

The first and second halves described above are joined together with the fitting cylindrical part of the second half fitted onto the cylindrical part of the first half, and pressed in a direction that brings the base parts of both halves closer to each other. , the peripheral edge of the through hole is sandwiched from both sides by the substrate parts of both halves.

(Example) Next, the present invention will be explained in more detail by explaining the illustrated embodiment.

FIG. 1 shows a first embodiment of the invention. The eyelet 17 shown in this embodiment is attached to the inner peripheral edge of the through hole 5 of the cylinder head gasket 1 to restrict the flow path for the lubricating oil inside the through hole 5.

This eyelet 17 is connected to the first and second halves 18 and 19.
The cylindrical portion 20 formed on the first half piece 18 and the fitting cylindrical portion 21 formed on the second half piece 19 are connected by fitting into each other.

Among them, the first half piece 1 having a substantially hat-like shape
Reference numeral 8 denotes a tube portion 2 from an inner peripheral edge of a circular base portion 22 having a larger diameter than the inner diameter of the through hole 5 in which the eyelet 17 is to be attached.
One end of 0 is continuous. This cylindrical portion 20 has a small diameter closer to the substrate portion 22 and is inclined so that the diameter increases as it moves away from the substrate portion 22, and the outer peripheral edge of the plate portion 23 is continuous with the end opposite to the substrate portion 22. I'm letting you do it. A small-diameter through hole 24 is provided in the center of the plate portion 23 to allow lubricating oil to flow therethrough.

On the other hand, the second half piece 19 has a fitting cylinder part 21 continuous from the inner peripheral edge of the base plate part 25 similar to the first half piece 18 described above. The inner diameter of the distal end portion (the end opposite to the base plate portion 25) of this fitting cylindrical portion 21 is smaller than the maximum outer diameter of the cylindrical portion 20 of the first half 18, and the proximal end of this cylindrical portion 20 (the end closer to the substrate portion 22) is equal in outer diameter in the fitted state.

Both first and second halves 1 formed as described above
Reference numerals 8 and 19 designate base portions 22 and 25 of both halves 18 and 19 by externally fitting the distal end portion of the fitting tube portion 21 of the second half piece 19 onto the base end portion of the tube portion 20 of the first half piece 18. Both halves 18, 1 are pressed in the direction of bringing them closer together.
The peripheral edge of the through hole 5 of the cylinder head gasket 1 is held between the base plate parts 22 and 25 of 9 to form an eyelet 17 that covers the inner peripheral edge of the through hole 5. The lubricating oil flowing inside the through hole 5 flows through the through hole 24 in the center of the plate portion 23 of the first half piece 18, so if the inner diameter of this through hole 24 is appropriately determined, the flow rate of the lubricating oil can be adjusted. can be adjusted. In this case, if there is no need to reduce the area of the passage, the through hole 24 is opened to fill the entire plate part 23, as in the second embodiment shown in FIG.

In order to combine the first and second half pieces 18 and 19 to form the eyelet 17 that covers the inner peripheral edge of the through hole 5, as shown in FIG. 20 and the fitting cylindrical portion 21 of the second half piece 19 are inserted into the through hole 5 of the cylinder head gasket 1 from opposite directions, and the cylindrical portions 20 and 21 are lightly fitted. Next, both halves 1 are separated by a press device.
8 and 19 from above and below to plastically deform the cylindrical portion 20 and the fitting cylindrical portion 21, thereby forming the two halves 18, 19.
19 are firmly connected, and the outer peripheral edge of the through hole 5 is strongly clamped by the substrate parts 22 and 25 of both halves 18 and 19.

Next, FIGS. 4 and 5 show a third embodiment of the present invention. In this embodiment, the cylindrical portion 20 of the first half piece 18
The fitting cylindrical portion 2 of the second half piece 19 that fits with the base end of the
1 has a different tip shape from that of the first embodiment described above. That is, in the first embodiment described above, the tip of the fitting cylinder portion 21 was curved from the outside to the inside, whereas in the third embodiment shown in FIG. , on the contrary, is curved from the inside to the outside, and the outer circumferential surface of the cylindrical portion 20 and the inner circumferential surface of the fitting cylindrical portion 21 are brought into contact over a wide area. Even when forming the structure of the third embodiment, as shown in FIG.
After lightly fitting the two halves 18 and 19, the two cylindrical parts 20 and 21 are bent so as to engage with each other.

In any of the embodiments, depending on the type of seat, in order to prevent lubricating oil etc. from leaking between the two halves 18 and 19,
A sealant (including adhesive) may be applied between the contact surfaces of 9.

c. Effects of the invention Since the eyelet of the present invention is constructed as described above, the work of attaching it to the inner peripheral edge of the through hole can be done in one movement, and the eyelet attaching process can be simplified. Moreover, stable quality can be obtained even when the passage area is reduced. Furthermore, even if the diameter of the through hole to be fitted is small, the width of the eyelet can be freely increased.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is a sectional view showing the second embodiment of the invention, Fig. 3 is a sectional view showing a state in the middle of installing the eyelet, and Fig. 4 is a sectional view of the second embodiment of the invention. 5 is a sectional view showing the third embodiment, FIG. 5 is a sectional view showing the state in the middle of installation, FIG. 6 is a plan view of the cylinder head gasket, FIG. 7 is a sectional view of the conventional eyelet, and FIG. 8 is a sectional view showing the third embodiment. Figures 1 to 10 are cross-sectional views showing the state in which the eyelet is installed in the order of strokes, and Figures 11 to 13 are cross-sectional views showing three examples of structures for constricting the flow path. 1... Cylinder head gasket, 2... Grommet, 3... Bore hole, 4... Small circular hole, 5... Through hole, 6... Eyelet, 7... Circular plate, 8... Sealing material, 9... Throttle hole, 10... Circular plate, 11... Center hole, 12... Circular tube, 13... Metal fitting, 13a...
Cylindrical part, 14... Expanded diameter part, 15... Upper mold, 16...
...lower mold, 17...eyelet, 18...first half piece, 1
9...Second half piece, 20...Cylinder part, 21...Fitting cylinder part, 22...Base part, 23...Plate part, 24...
Through hole, 25... board part.

Claims (1)

[Scope of utility model registration request] A ring-shaped base plate having a substantially hat-like shape, an outer periphery of which has a larger diameter than the through-hole in which the eyelet is to be attached, and an inner periphery of which has a smaller diameter than the through-hole; a first half consisting of a cylindrical portion provided therein, a plate portion connected to the cylindrical portion and having a through hole in the center; a substrate portion substantially similar to the substrate portion of the first half; a second half consisting of a fitting cylindrical part continuous from the inner circumferential edge of the substrate part, and the fitting cylindrical part of the second half is externally fitted into the cylindrical part of the first half to form the board part of both halves. The eyelet is pressed in the direction of bringing the two halves closer together, and the periphery of the through hole is held between the base parts of both halves.