JPS6324307Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tubular part connecting device using an O-ring for airtightly fitting and connecting a small diameter tubular opening to a large diameter tubular opening.

One of the tubular openings of the two devices is formed with a large diameter,
When the other is formed to have a small diameter and the two are fitted and connected while keeping them airtight, conventionally the diameter difference between the two large and small diameter tubular openings is small, so the axes of both tubular openings are perfectly aligned. However, if there is a misalignment, such as the axes of both tubular openings being slightly different from each other, fitting becomes difficult.

In particular, if the mounting angles of both devices, one with a large-diameter tubular opening and the other with a small-diameter tubular opening, cannot be adjusted, it will be impossible for the two tubular openings to fit together.

For example, V shown in a plan view as an example in FIG.
Intake manifold 2, 2 of multi-cylinder internal combustion engine 1
On the other hand, the duct part 4 for supplying air from the compressor 3a of the exhaust supercharger 3 has a large diameter tubular opening, and the fixed duct 6 has a small diameter part on the side of the intercooler 5 provided in front of the intake manifolds 2, 2. When the duct 6 is fitted into and connected to the duct part 4 as a pipe opening part, the intercooler 5 is fixed to the internal combustion engine 1, and the exhaust supercharger 3 is also fixed in a fixed position. The direction of the axes of the duct 4 and the duct 6 cannot be changed, and the duct part 4 and the duct 6 are made of heat-resistant metal, for example, cast aluminum, and the duct part 4 and the duct 6 need to be connected airtightly. Considering that two O-rings 7 are used with a required spacing in the axial direction, if the duct parts 4 and 6 have a small diameter difference and their axes are misaligned, it will be difficult to fit them together, and they may not be able to fit together. It was possible that something would happen.

As mentioned above, the present invention is extremely easy to maintain airtightness between the large diameter tubular opening and the small diameter tubular opening, which cannot change the direction of their axes and must be connected in an airtight manner. The diameter difference between two large and small diameter tubular openings that are fitted and connected to each other is formed to be large, and an axis line is formed on the outer circumferential surface of the smaller diameter tubular opening of both tubular openings. Two circumferential grooves are provided with a small distance in the direction, and the gap between the two circumferential grooves is larger than the outer diameter of the small diameter tubular opening.
An annular partition having an outer diameter equal to or slightly smaller than the inner diameter of the large-diameter tubular opening and having a tip engaging portion;
The tubular part connecting device uses O-rings, in which O-rings each having an outer diameter larger than the inner diameter of the large-diameter tubular opening under no load are inserted into the circumferential groove.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a main part of the present invention in a partially enlarged vertical sectional view. The duct 6 as a small-diameter tubular opening that is fitted and connected to the duct portion 4 as a large-diameter tubular opening has a large diameter difference from each other, and the opening end surface 6a of the duct 6 is
Two circumferential grooves 8, 8 are provided at predetermined positions close to.

The interval between the circumferential grooves 8, 8 should be as small as possible, preferably within 5 mm, for example.

O-rings 7, 7 are fitted into the circumferential grooves 8, 8, respectively.

On the other hand, the outer diameter D ₁ of the tip engaging portion 9a of the annular partition wall 9 formed between the circumferential grooves 8 and 8 is the outer diameter of the duct 6.
It is larger than D ₂ , smaller than the outer diameter of the O-rings 7 , 7 under no load, and has an outer diameter that is the same as or slightly smaller than the inner diameter D ₃ of the duct portion 4 .

Although the distal end engaging portion 9a of the annular partition wall portion 9 has a convex semicircular cross-section in this embodiment, it may be formed into a double-edged or single-edged knife edge shape.

Since the device of the present invention is configured as described above, when the exhaust supercharger 3 having the duct portion 4 and the internal combustion engine 1 having the duct 6 are fitted and connected to each other in a fixed fixed state, the structure shown in FIG. Like duct part 4
Even if the axes of the duct 6 intersect with each other, the annular partition wall 9 enters the duct part 4 and the duct 6 tilts with the tip engaging part 9a as a fulcrum, and at the same time the two O-rings 7, 7 are securely connected. Then, the gap caused by the difference in diameter between the duct portion 4 and the duct 6 is closed, and a perfect sealing state is obtained.

As is clear from the above explanation, in this case, the two large and small diameter tubular openings that fit and connect each other are tubular openings with a large diameter difference, so even if there is misalignment or positional deviation, as long as it is not too extreme, both At this time, there is no problem with the stability of the small diameter tubular opening which tilts within the large diameter tubular opening with the tip engagement part of the annular partition between the two O-rings serving as a fulcrum. Since the two O-rings maintain airtightness, this has the excellent advantage of providing a fitting connection with reliable sealing ability against normal pressure.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an example of connecting an intercooler side duct and an exhaust supercharger side duct of an internal combustion engine as an example of connecting two large and small diameter tubular openings, and Fig. 2 is a plan view of the present invention. FIG. 3 is an enlarged vertical cross-sectional view showing only half of an embodiment of the device, and FIG. 3 is an enlarged vertical cross-sectional view showing an embodiment of the present device in which tubular mouth portions of large and small diameters 2 which are shifted in position are connected. 4...Duct part, 6...Duct, 7...O-ring, 8...Peripheral groove, 9...Annular partition part, 9a...Tip engaging part, _D1 ...Flame outer diameter, _D2 ... ...outer diameter of the duct 6 as a small-diameter tubular opening, D ₃ ...inner diameter of the duct portion 4 as a large-diameter tubular opening.

Claims (1)

[Scope of utility model registration request] The diameter difference between the two large and small diameter tubular openings that fit and connect with each other is formed to be large, and further, among both the tubular openings,
Two circumferential grooves are provided on the outer circumferential surface of the small-diameter tubular opening with a small distance in the axial direction, and a groove with a diameter larger than the outer diameter of the small-diameter tubular opening is provided between the two circumferential grooves. An annular partition having an outer diameter equal to or slightly smaller than the inner diameter of the tubular opening and having a tip engaging portion, and in the circumferential groove,
A tubular part connecting device using an O-ring, the O-ring having an outer diameter larger than the inner diameter of the large-diameter tubular opening when no load is applied.