JPH03234972A - Sealing method of cylindrical body - Google Patents

Abstract

PURPOSE:To improve the work efficiency by forming a tapered surface contacting to the whole periphery of an O ring at least on one side at the inner circumferential edge at the upper side of an installing hole in the opposite member, or at the inner circumferential edge on the lower side of a pressing member, as well as forming the inner diameter of the O ring larger than the outer diameter of the outer wall of a cylindrical body. CONSTITUTION:While a body 11 is arranged to the inserting hole 15 of an examination jig 14, a pressing member 17 is pushed downward by a circular projection 11a formed to the body 11, and an O ring 16 arranged to a tapered surface 15a at the upper side of the installing hole 15 is pressed by the pressing member 17. As a result, the whole circumference of the O ring 16 is pressed by the tapered surface 15a of the jig 14 and the tapered surface 17b of a member 17, the diameter of the O ring 16 whose inner diameter D2 is made larger than the outer diameter D1 of the outer wall 12 is compressed to pressure- contact the O ring 16 to the outer wall 12 of the body 11, and the outer wall 12 and the jig 14 are sealed. And a pressured air is poured to flow in from a leak tester 10, to examine the airtightness between the body 11 and a sheet 13 which is pressed in.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to a mating member disposed on the outer circumferential side of a cylindrical body and an outer wall of the cylindrical body, or inserted into the inner circumferential side of the cylindrical body. An O-ring is disposed between the mating member and the inner wall of the cylindrical body, and a pressing member that presses the O-ring is used to connect the outer wall of the cylindrical body and the mating member, or the inner wall of the cylindrical body and the mating member, Regarding how to seal each.

Specifically, in order to inspect the sealing state between a cylindrical body of an object to be inspected (for example, a fuel injection valve) and a seat press-fitted into the body, the body on which the seat is disposed is used as a mating member. The present invention relates to a method for achieving good sealing between a body and an inspection jig when performing an inspection using the inspection jig.

<Conventional technology and its problems> Conventionally, for example, in a fuel injection valve, as shown in FIG.
It is necessary to test the airtightness between the sheet 3 press-fitted into the cylindrical body 1 and the body 1, and the test is carried out using an inspection jig 4 connected to a leak tester 10.
(See Publication No. 9-170245).

This inspection jig 4 is provided with a mounting hole 5 that communicates with the leak tester 10 and into which the body 1 is inserted, and serves as a mating member for the body 1. An O-ring 6 that is pressed against the outer wall 2 is provided.

At the time of inspection, the body 1 is attached to the mounting hole 5 of the inspection jig 4.
An O-ring 6 was placed in pressure contact around the outer wall 2, and pressurized air was flowed in from a leak tester 10 to test the airtightness between the body 1 and the press-fitted seat 3.

However, if there is a leak in the seal between the outer wall 2 of the body 1 and the inspection jig 4, the air tightness test between the tenon 1 and the seat 3 cannot be properly performed. It is configured to be smaller than the diameter.

Therefore, it takes time and effort to place the inspection jig 4 of the body 1 into the mounting hole 5, resulting in poor workability. 6 was removed while still attached, making it impossible to efficiently perform an airtight inspection on a large number of bodies 1.

Furthermore, when the body 1 is placed in the mounting hole 5, the O-ring 6 is strongly rubbed against the outer wall 2 of the body 1, and this friction causes the O-ring 6 to deteriorate more quickly.

Furthermore, the sealing force of the body 1 to the outer wall 2 is 0.
The inner diameter of the ring 6 is constant, and the sealing force cannot be freely adjusted.

This invention solves the above-mentioned problem, and when sealing a cylindrical body such as the body of a fuel injector using an O-ring, when the cylindrical body is placed relative to or removed from a mating member. The purpose of the present invention is to provide a method for sealing a cylindrical body, which can improve workability, suppress progress of deterioration of the O-ring, and further change the sealing force of the O-ring against the cylindrical body. do.

Means for Solving the Problems> A first method for sealing a cylindrical body according to the present invention includes a cylindrical body disposed in a mounting hole formed in a mating member, and a seal between the outer wall of the cylindrical body and the mating member. A method of sealing the outer wall and a mating member by disposing an O-ring on the outer wall and using a pressing member that presses the O-ring (method for sealing an outer wall of a cylindrical body), wherein the inner diameter of the O-ring is larger than the inner diameter of the outer wall. a tapered surface that abuts the entire circumference of the O-ring is formed on at least one of the upper inner circumferential edge of the mounting hole in the mating member and the lower inner circumferential edge of the pressing member; disposing the O-ring on the inner peripheral edge of the upper part of the mounting hole in the mating member, disposing the cylindrical body in the mounting hole of the mating member, and pressing the O-ring toward the mating member by the pressing member; The O-ring is pressed against the outer wall via the tapered surface to seal the outer wall and a mating member.

Further, in the sealing method for a cylindrical body according to the present invention, secondly, a mating member is inserted into the cylindrical body, an O-ring is disposed between the inner wall of the cylindrical body and the mating member, and the O-ring is pressed. A method of sealing the inner wall and a mating member using a pressing member (inner wall sealing method of a cylindrical body), wherein the outer diameter of the O-ring is smaller than the inner diameter of the inner wall, and the outer diameter of the O-ring is smaller than the inner diameter of the inner wall. A tapered surface that abuts the entire circumference of the O-ring is formed on at least one of the outer circumferential edge of the upper part and the outer circumferential edge of the lower part of the pressing member, and the O-ring is disposed on the outer circumferential edge of the upper part of the mating member, and arranging the cylindrical body on the mating member so as to insert the mating member into the cylindrical body, pressing the O-ring toward the mating member with the pressing member,
The O-ring is pressed against the inner wall via the tapered surface to seal the inner wall and a mating member.

<Operations and Effects of the Invention> In the method for sealing the outer wall of a cylindrical body according to the present invention, the cylindrical body is placed in the mounting hole of a mating member, and the O-ring disposed on the upper periphery of the mounting hole is pressed by a pressing member. if,
The entire circumference of the O-ring is pressed by the tapered surface formed on at least one of the inner circumferential edge of the upper part of the mounting hole in the mating member and the inner circumferential edge of the lower part of the pressing member, and the inner diameter is made smaller than the outer diameter of the outer wall of the cylindrical body. The enlarged O-ring is reduced in diameter and pressed against the outer wall of the cylindrical body, thereby making it possible to seal the outer wall of the cylindrical body and the mating member.

Therefore, since the inner diameter of the O-ring is initially larger than the outer diameter of the outer wall of the cylindrical body, it is easy to place the cylindrical body into the mounting hole of the mating member, and when the cylindrical body is removed, the pressing member When the pressing force is released, the diameter of the O-ring expands to its original size and the cylindrical body can be easily removed from the mating member.

In addition, when the cylindrical body is placed in or removed from the mounting hole of the mating member, the O-ring has an inner diameter larger than the outer diameter of the outer wall of the cylindrical body, so it does not rub strongly against the outer wall of the cylindrical body. It is possible to suppress the progress of deterioration of the O-ring.

Furthermore, if the pressing force of the pressing member is increased, the entire circumference of the O-ring is further increased due to the tapered surface formed on at least one of the upper inner peripheral edge of the mounting hole in the mating member and the lower inner peripheral edge of the pressing member. Since it is pressed, the sealing force of the O-ring can be increased in accordance with the pressing force of the pressing member, and can be freely adjusted by the pressing force of the pressing member.

Further, in the method for sealing the inner wall of a cylindrical body according to the present invention, the cylindrical body is placed on the mating member so that the mating member is inserted into the cylindrical body, and the O-ring disposed on the outer periphery of the upper part of the mating member is pressed. When pressed by the member, the entire circumference of the O-ring is pressed by the tapered surface formed on at least one of the upper outer circumferential edge of the mating member and the lower outer circumferential edge of the pressing member, and the outer diameter is pressed against the inner wall of the cylindrical body. The O-ring, which has an inner diameter smaller than the inner diameter of the cylindrical body, is expanded in diameter and pressed against the inner wall of the cylindrical body, thereby making it possible to seal the inner wall of the cylindrical body and the mating member.

Therefore, since the outer diameter of the O-ring is initially smaller than the inner diameter of the inner wall of the cylindrical body, it becomes easier to position the cylindrical body relative to the mating member, and when the cylindrical body is removed, the pressing member When the pressing force is released, the diameter of the O-ring is reduced to its original size, and the cylindrical body can be easily removed from the mating member.

In addition, when placing or removing the cylindrical body from a mating member, the outer diameter of the 0 ring is smaller than the inner diameter of the inner wall of the cylindrical body, so that it does not rub strongly against the inner wall of the cylindrical body. Progress of deterioration of the ring can be suppressed.

Furthermore, if the pressing force of the pressing member is increased, the entire circumference of the O-ring is further pressed by the tapered surface formed on at least one of the upper outer peripheral edge of the mating member and the lower outer peripheral edge of the pressing member. Therefore, the sealing force of the O-ring can be increased in accordance with the pressing force of the pressing member, and can be freely adjusted by the pressing force of the pressing member.

Therefore, in the present invention, when an O-ring is used to seal the outer wall or inner wall of a cylindrical body such as the body of a fuel injection valve, workability when arranging or removing the cylindrical body from a mating member is improved. and also 0
It is possible to suppress the progress of deterioration of the ring, and furthermore, it is possible to suppress the progress of deterioration of the ring. The sealing force of the link can be changed arbitrarily.

Note that the sealing method of the present invention is particularly effective when end face sealing cannot be performed, such as when the area of the end face of the cylindrical body is small.

<Example> Embodiments of the present invention will be described below based on the drawings.

The first embodiment shown in FIG. 1 is a method for sealing the outer wall of a cylindrical body, in which the cylindrical body is used as the body 11 of a fuel injection valve, and the mating member is an airtight test between the body 11 and a seat 13 press-fitted into the body 11. This is an inspection jig 14 for performing the following.

The inspection jig 14 has a circular opening into which the body 11 is inserted, and a mounting hole 15 that communicates with the leak tester 1o.

A tapered surface 15a is formed on the inner peripheral edge of the upper part of the mounting hole 15 over the entire circumference.
An O-ring 16 is placed on the O-ring 5a, which has an inner diameter D2 larger than the outer diameter DI of the outer wall 12 at the lower part of the body 11 by about 0.2 to 0.8 mm.

Further, above the inspection jig 14, a pressing member 17 is provided which has an insertion hole 17a having an inner diameter substantially equal to that of the mounting hole 15.

A cheek R surface 17b is formed on the inner peripheral edge of the lower part of the insertion hole 17a of the pressing member 17 over the entire circumference thereof.

Further, this pressing member 17 utilizes a predetermined number of fixing bolts 18 screwed to the inspection jig 14 and a compression coil spring 19 disposed around each fixing bolt 18. 14, is urged upward and held with its separation distance regulated.

Next, an airtight test of the body 11 and the seat 13 will be described using the test jig 14 of the first embodiment.

First, the body j1 is placed in the mounting hole 15 of the inspection jig 14, and the pressing member 17 is pushed downward by the circular protrusion 11a formed on the body 11.
The O-ring 16 disposed on the upper tapered surface 15a of the mounting hole 15 is pressed by the pressing member 17.

Then, as shown in FIG. 2, the entire circumference of the O-ring 16 is pressed by the tapered surface 15a of the inspection jig 14 and the tapered surface 17b of the pressing member 17, making the inner diameter D2 larger than the outer diameter D1 of the outer wall 12. The O-ring 16 is reduced in diameter and pressed against the outer wall 12 of the body 11, and can seal the outer wall 12 of the body 11 and the inspection jig 14.

Then, pressurized air is introduced from the leak tester 10,
The airtightness between the body 11 and the press-fitted sheet 13 is inspected.

Therefore, since the inner diameter D2 of the O-ring 16 is initially larger than the outer diameter D1 of the outer wall 12 of the body 11, the work of arranging the body 11 into the mounting hole 15 of the inspection jig 14 is facilitated, and the body 11 is When removing it, by releasing the pressing force of the pressing member 7, the diameter of the O-ring 16 expands to its original size 2 and the body 11 can be easily removed from the inspection jig 14.

Further, when the body 11 is placed in or removed from the mounting hole 15 of the inspection jig 14, the O-ring 16 has an inner diameter D2 larger than an outer diameter D1 of the outer wall 12 of the body 11, and the outer wall of the body 11 12 and will not be rubbed too hard,
Progress of deterioration of the O-ring 16 can be suppressed.

Furthermore, if the pressing force for pushing down the pressing member 17 is increased, the tapered surface 15a of the inspection jig 14 and the pressing member 17 can be
Since the entire circumference of the O-ring 16 is further pressed by the O-ring 17b, the sealing force of the O-ring 16 can be increased in accordance with the pressing force of the pressing member 17. Can be adjusted.

In the case of the embodiment, the radially inward force of the O-ring 16 increases the pressing force of the pressing member 17 by f, as shown in FIG.
In this case, f tan θ. Therefore, as in the embodiment, the angle θ of the tapered surfaces 15a and 17b is Oo〈θ〈
The angle may be within the range of 90°, but preferably 45°, so that the force of the pressing force f can be used efficiently.

Further, in the embodiment, the tapered surfaces 15a and 17b are provided on the inspection jig 14 and the pressing member 17, but of course,
- May be set only for titer. At that time, for example, as shown in FIG. 3, the tapered surface f5 is formed only on the inspection jig 14 side.
a, the O-ring 16 is provided on the pressing member 17 side.
It is also possible to provide an annular four part 1f b into which the four parts 1 and 1 are fitted.

Further, in the embodiment, the pressing member 17 is held in the inspection jig 14 using the fixing bolt 18 and the coil spring 19, but as shown in FIG. The O-ring 16 may be configured to be screwed onto the inner periphery of the cylindrical member 24 extending from the tool 14 to be held there, and the pressing force of the O-ring 16 may be adjusted by rotating the pressing member 27 in the horizontal direction.

Furthermore, even if the pressing members 17 and 27 are not configured as illustrated, for example, a tapered surface 15a may be formed on the inspection jig 14 side.
is formed, the protrusion 11a of the body 11 is
By using the ring 16 as a pressing member for pressing, it is not necessary to provide the pressing members 17 and 27 as illustrated.

The second embodiment shown in FIG. 5 is a method for sealing the inner wall of a cylindrical body, in which the cylindrical body is used as the body 11 of a fuel injection valve, and an airtight test is performed between the body 11 as a mating member and a seat 13 press-fitted into the body 11. This is an inspection jig 34 for performing the following.

The inspection jig 34 includes an insertion hole 34a connected to the leak tester 10, and also includes a cylindrical protrusion 35 on the top to which the body 11 can be mounted.

A tapered surface 35a is formed on the outer peripheral edge of the upper part of the protrusion 35 over the entire circumference. An O-ring 36 is placed on the tapered surface 35a to make the outer diameter D4 smaller than the inner diameter D3 of the inner wall 22 at the lower part of the body 11 by about 0.2 to 0.8 mm.

Further, a cylindrical head 37a of the pressing member 37 is disposed above the inspection jig 34, and the head 37a has an outer diameter approximately equal to the outer diameter of the upper part of the protrusion 35. . A shaft portion 37c is formed at the lower part of the head 37a, and the shaft portion 37c is inserted into the insertion hole 35b of the protrusion 35 so as to be movable up and down. Further, inside the pressing member 37, a ventilation hole 37d is formed which serves as a flow path for pressurized air during inspection.

A tapered surface 37b is formed on the outer peripheral edge of the lower part of the head 37a of the pressing member 37 over the entire circumference.

Further, in this pressing member 37, a rod 38a of an air cylinder 38 is connected to the lower part of the shaft portion 37c.

Next, an airtight inspection of the body 11 and the seat 13 will be described using the inspection jig 34 of the second embodiment.

First, the body 11 is placed on the protrusion 35 of the inspection jig 34 so that the inspection jig 34 is inserted into the body 11, and the rod 38a of the air cylinder 38 connected to the shaft 37c is moved downward. The head 37a of the pressing member 37 presses the O-ring 36 disposed on the top surface 35a of the protrusion 35 in the inspection jig 34.

Then, as shown in FIG. 6, the entire circumference of the O-ring 36 is pressed by the tapered surface 35a of the inspection jig 34 and the tapered surface 37b of the pressing member 37, making the outer diameter D4 smaller than the inner diameter D3 of the inner wall 22. The O-ring 36 is expanded in diameter and pressed against the inner wall 22 of the body 11, and can seal the inner wall 22 of the body 11 and the inspection jig 34.

Then, pressurized air is introduced from the leak tester 10,
The airtightness between the body 11 and the press-fitted sheet 13 is inspected.

Therefore, since the outer diameter D4 of the O-ring 36 is initially smaller than the inner diameter D3 of the inner wall 22 of the body 11, it becomes easy to place the body 11 on the inspection jig 34, and when removing the body 11, If the pressing force of the pressing member 37 is released, the diameter of the O-ring 36 is reduced to its original size, and the body 11 can be easily removed from the inspection jig 34. When the O-ring 36 is placed in or removed from the section 35, the outer diameter D4 of the O-ring 36 is smaller than the inner diameter D3 of the inner wall 22 of the body 11, so that the O-ring 36 is not rubbed strongly against the inner wall 22 of the body 11. The progress of deterioration can be suppressed.

Furthermore, if the pressing force for pushing down the pressing member 37 is increased, the tapered surface 35a of the inspection jig 34 and the pressing member 37 can be
37b further presses the entire circumference of the O-ring 36, the sealing force of the O-ring 36 can be increased in accordance with the pressing force of the pressing member 37, and the sealing force of the O-ring 36 can be freely increased by the pressing force of the pressing member 37. Adjust - be able to.

In this second embodiment, the tapered surfaces 35a and 37b are provided on the inspection jig 34 and the pressing member 37, but of course they may be provided only on the − titer.

Further, in this second embodiment, the pressing member 37 is moved by a moving means such as an air cylinder 38, but for example, an annular protrusion 1 is formed on the inner wall 22 of the body 11.
1b (see the two-dot chain line in FIG. 5), the pressing member 37 may be pressed by pressing down the entire body 11 using this projection fib. Furthermore, the inspection jig 34
When the tapered surface 35a is formed on the side, if the protruding portion 11b is used as a pressing member for pressing the O-ring 36, it is not necessary to provide the pressing member 37 and the air cylinder 38 as illustrated.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the state before sealing of the first embodiment of the present invention, Fig. 2 is a cross-sectional view showing the sealed state of the same embodiment, and Fig. 3 is a cross-sectional view showing another aspect of the same embodiment. Fig. 4 is a sectional view showing still another aspect of the same embodiment, Fig. 5 is a sectional view showing the state before sealing of the second embodiment, and Fig. 6 is a sectional view showing the sealed state of the same embodiment. 7 are sectional views showing the conventional method. 9 11... (Cylindrical body) Body 12... Outer wall, 22... Inner wall, 14, 34... (Mating member) Inspection jig, 15... Mounting hole, 16, 36... 0 Ring, 17/37...pressing member. 0 Patent Applicant Aisan Kogyo Co., Ltd. Figure 2 Figure 5 Figure 5 Figure 5 (23 and 5)

Claims (1)

[Claims] 1. A cylindrical body is disposed in a mounting hole formed in a mating member,
A method of sealing the outer wall and the mating member by disposing an O-ring between the outer wall of the cylindrical body and the mating member and using a pressing member that presses the O-ring, the inner diameter of the O-ring is formed to be larger than the outer diameter of the outer wall, and at least one of the inner circumferential edge of the upper part of the mounting hole in the mating member and the inner circumferential edge of the lower part of the pressing member has a tapered surface that abuts the entire circumference of the O-ring. The O-ring is arranged on the inner peripheral edge of the upper part of the mounting hole in the mating member, the cylindrical body is arranged in the mounting hole of the mating member, and the O-ring is pressed against the mating member by the pressing member. A method for sealing a cylindrical body, characterized in that the O-ring is pressed against the outer wall through the tapered surface to seal the outer wall and a mating member. 2. A mating member is inserted into the cylindrical body, and an O-ring is disposed between the inner wall of the cylindrical body and the mating member, and the O-ring is disposed between the inner wall of the cylindrical body and the mating member.
A method of sealing the inner wall and a mating member using a pressing member that presses a ring, the outer diameter of the O-ring being smaller than the inner diameter of the inner wall, and the outer peripheral edge of the upper part of the mating member A tapered surface that contacts the entire circumference of the O-ring is formed on at least one of the outer peripheral edge of the lower part of the pressing member, and the O-ring is disposed on the outer peripheral edge of the upper part of the counterpart member, and arranging the cylindrical body on the mating member so as to insert the mating member, and pressing the O-ring toward the mating member with the pressing member;
A method for sealing a cylindrical body, characterized in that the O-ring is pressed against the inner wall via the tapered surface to seal the inner wall and a mating member.