JPS59535Y2 - Fluid passage sealing device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a structure for an internal combustion engine or the like having a portion in which a fluid passage is provided across two members and the two members are joined by bringing their mating surfaces into close contact. This invention relates to a sealing device for a fluid passage provided in the mating surface portion to prevent fluid from leaking from the mating surface.

In horizontally opposed engines, separate left and right crankcases are used to lower the height of the engine, reduce the volume occupied in the engine compartment of the car, and obtain advantages such as compactness, improved maintainability, and reduced number of parts. Some types have a cooling water passage formed in the crankcase that separates the flow into the crankcase.

In such an internal combustion engine, there is a risk that the cooling water flowing through the cooling water passage from the mating surfaces of the left and right crankcases may leak outside or into the crank chamber, so it is necessary to securely seal the engine.

In this case, it is inappropriate to interpose a gasket made of an elastic material between the left and right crankcases because variation in thickness is not allowed when joining the left and right crankcases.

By the way, examples of prior art related to solving this inappropriate point include, for example, Utility Model Application Laid-Open No. 51-122244.
According to this, a seal ring is fitted into a groove formed along the peripheral wall of the liquid chamber, and a backup of approximately the same width as the seal ring is fitted on the inner peripheral surface of the ring. Although the member in one direction and the member in the other direction are fastened together, there is a drawback in that it is difficult to align their mating surfaces.

The present invention was developed in view of the above-mentioned circumstances, and involves providing a passage for fluid such as cooling water across two members, such as the left and right crankcases of a horizontally opposed engine, and bringing the two members into close contact with their mating surfaces. In addition to not having the above-mentioned drawbacks, a product having parts that are joined together can reliably prevent leakage of cooling water from the mating surfaces of two members without obstructing fluid flow. It is an object of the present invention to provide a fluid passage sealing device that can increase surface pressure, is easy to process, and has a simple configuration.

In order to achieve the above object, the fluid passage sealing device of the present invention provides a fluid passage sealing device for a structure such as an internal combustion engine as described above, in which a seal is placed around the cooling water passage wall at the mating surface of at least one of the two members. A groove is formed along the groove, a seal ring made of an elastic material is fitted into the groove, and a ring is formed on the inner peripheral surface of the seal ring to prevent the tongue from bulging toward the cooling water passage. A backup member having a shaped cross section and protruding to both sides of the ring is fitted, and the protruding portion is positioned along the periphery of the fluid passage wall on both sides of the groove of the two members. The seal ring is fitted into the backup member fitting groove formed by the two members, and the seal ring is elastically deformed and tightened by the two members.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

FIG. 1 and FIG. 2 schematically show a cooling system for a horizontally opposed engine as an example to which the present invention is applied.

In these figures, reference numeral 1 denotes an internal combustion engine body, and this engine body 1 is provided with left and right crankcases 4 and 5 integrally with separate cylinder blocks 2 and 3 that are divided into left and right parts.
A cylinder head 6.7 is fixed to the cylinder blocks 2, 3, and a cooling water passage 8 is formed inside each member.

A radiator 9 provided outside the engine body 1 connects to the crankshaft 1.
The cooling water passage 8 is connected to the suction side of a water pump 11 driven by a driving force from zero, and the cooling water passage 8 is connected to the discharge side of this pump 11. As shown in FIG.
The water is returned to the radiator 9 through a main recirculation passage 15 having a main recirculation passage 15, and is also returned to the suction side of the pump 11 through a bypass recirculation passage 16.

The cooling water passages 8a in the crankcases 4 and 5 are branched left and right from within one crankcase 5 and guided to the main and bypass return passages 15 and 16 sides of the cooling water passage 13 in the intake manifold, respectively. It has become.

The above configuration is the same as the cooling system of a conventional horizontally opposed engine.

In FIGS. 1 and 2, reference numeral 12 is a carburetor, 17 is a cylinder bore, 18 is a piston, and 19 is a connecting rod.

the cylinder blocks 2, 3 and the crankcase 4,
5 are fastened and connected to each other so that their mating surfaces are brought into close contact.

The cooling water passage 8 is formed across the left and right crankcases 4 and 5, and a sealing device is provided on the mating surface A of these, as shown in detail in FIGS. 3 and 4.

In this sealing device, a groove 22 for fitting a seal ring 21 (described later) is formed along the periphery of a cooling water passage wall 20 on a mating surface portion of one crankcase 5, and a backup member (described later) is formed on both sides of this groove 22. 23 fitting groove 24.2
5 is the cooling water passage wall 20.26 of both crankcases 4 and 5.
is formed around the periphery of the

The seal ring 21 has a fitting groove 2 made of an elastic material.
2, the backup member 23 is made of a substantially cylindrical metal plate with a cut-off portion 27 extending over its entire length in a part of the circumferential direction, and is fitted to the inner circumferential surface of the seal ring 21 through the cut-off portion 27. The protruding portions 23a, 23a from the seal ring 21 are fitted into the backup member fitting grooves 24 and 25.

Furthermore, although the seal ring 21 is elastically deformed due to the tightening of both crankcases 4 and 5, the inner peripheral surface of this ring 21 is supported by the backup member 23 to prevent it from bulging into the cooling water passage 8. has been done.

Note that the backup member 23 includes the protruding portion 23a,
23a and at least one of both end walls of the fitting groove 24.25, the length is such that a gap is formed when the mating surface of the crankcase 4.5 is brought into close contact with the mating surface of the crankcase 4.5. Both crankcases 4 and 5 are tightened by the pressure, and a predetermined amount of elastic deformation is given to the seal ring 21.

The cooling water passages 8a in the crankcases 4 and 5 are formed in a horizontally oblong cross-sectional shape with a reduced height, and a seal ring 21 and a backup member 2 are formed in a similar cross-sectional shape.
3 is also formed.

In the sealing device configured as described above, the mating surface of one crankcase 5 in which the seal ring 21 is fitted into the groove 22 has 1. Since the other crankcase 4 is guided and approached while its fitting groove 24 is fitted to the protruding portion 23a of the backup member 23 from the seal ring 21, the mating surfaces of these crankcases 4 can be aligned. It becomes easier to remove.

When these crankcases are tightened, the seal ring 21 is also tightened and elastically deformed, thereby reliably preventing the cooling water flowing through the cooling water passage 8a from leaking from the mating surfaces of both crankcases 4.5.

A backup member 23 is provided on the inner peripheral surface of the seal ring 21 to prevent the seal ring 21 from protruding into the cold sacred tree passage 8a during assembly or use, so that the flow of cooling water is not obstructed. .

Since the fitting groove 22 of the seal ring 21 is formed along the circumference of the cooling water passage wall 20, the fitting groove 22 is formed on the mating surface of the crankcase, spaced apart from the cooling water passage and concentrically with this passage. The fitting groove 22
It is easy to process.

In particular, in this embodiment, since the cooling water passage 8a is formed in the crankcases 4 and 5 with a horizontally oblong circular cross section of low height, the end mill e is shifted in the lateral direction, as is clear from FIG. However, it is extremely difficult to machine the fitting groove apart from the cooling water passage as described above, and the one in this example is horizontally long. A cooling water channel of circular cross section is particularly advantageous.

Note that this advantage is applicable to the cooling water passage 8a applicable to the present invention.
It can also be obtained when the cross section of is non-perfectly round, such as an ellipse or an oval shape.

In the present invention, the fitting groove of the seal ring 21 may be provided facing both crankcases 4 and 5.

In addition, in this example, since a cutoff portion 27 is provided in a part of the circumferential direction of the backup member 23 over the entire length thereof, by elastically deforming the backup member 23 and reducing its diameter,
This member 23 can be easily assembled.

In addition, in the present invention, the backup member 23 and the seal ring 21 may be fixed together by appropriate means.

The present invention can also be applied to a device for sealing a fluid passage in a mating surface of two members other than internal combustion engines.

As explained above, the fluid passage sealing device of the present invention is
The mating surfaces of the two members can be easily aligned, and water leakage from the mating surfaces of the fluid passage provided across the mating surfaces can be reliably prevented without impeding fluid flow.
Furthermore, it has the advantage of being easy to process and having a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an example of the configuration of a cooling system in a horizontally opposed engine; Fig. 2 is a schematic front view of the same;
4 is a sectional side view showing an embodiment of the present invention, FIG. 4 is a sectional view taken along the line XX--IV in FIG. 3, and FIG. DESCRIPTION OF SYMBOLS 1... Internal combustion engine main body, 2, 3... Cylinder block, 4.5... Crank case, 6, 7... Cylinder head, 8, 8a... Cooling water passage, 9... Radiator, 10... Crankshaft, 11... Water pump, 12... Carburetor, 13... Cooling water passage, 14...
・Thermostat, 15 ・Main reflux passage, 16
...Bypass reflux passage, 17...Cylinder bore, 1
8... Piston, 19... Connecting rod, 20.26
...Cooling water passage wall, 21...Seal ring, 22.
...Seal ring fitting groove, 23...Backup member, 23a...Protrusion part, 24.25...Backup member fitting groove, 27...Separation part, A...
Matching surface part, e...end mill.

Claims (1)

[Scope of utility model registration request] A fluid passageway is provided across two members, and the two members are joined by bringing their mating surfaces into close contact with each other, wherein the mating surface portion of at least one of the two members,
A concave groove is formed along the periphery of the fluid passage wall, a seal ring made of an elastic material is fitted into this concave groove, and a seal ring made of an elastic material is fitted on the inner peripheral surface of the seal ring to prevent the ring from bulging toward the fluid passage side. having a substantially ring-shaped cross section and projecting to both sides of the ring, these projecting portions are positioned on both sides of the groove of the two members to form the fluid passageway. A sealing device for a fluid passage, characterized in that the seal ring is fitted into a backup member fitting groove formed along the periphery of a wall, and the seal ring is elastically deformed and tightened by the two members.