JPS6039534Y2 - Seal/locking bolt - Google Patents

Description

[Detailed description of the invention] The present invention relates to a seal/loosening bolt, in which a concave portion surrounding the bolt axis is formed on the fastening seat surface of the bolt head, and an elastic/flexible seal is formed in this concave portion. A sealing effect and a loosening preventing effect are achieved by fitting the rings and making the outer circumferential wall surface of the seal ring protrude from the fastening seat surface at an angle in the centripetal direction.

A seal ring is usually provided on the nut seating surface to ensure a sealing effect and a loosening prevention effect.

With this means, the sealing effect is exclusively in the radial direction, and no effect in the axial direction can be expected.

Further, the anti-sagging effect was also weak.

Furthermore, in screw fastening devices that require more attention than head bolts and nuts, if you only expect a sealing effect on the nut bearing surface, you will be subject to restrictions on the fastening part, and it is also necessary to expect a sealing effect on the bolt head bearing surface as well. Of course, it is desirable to do so.

In view of the above-mentioned circumstances, the inventors of the present invention aimed to provide a bolt that can achieve a sealing effect especially on the bolt head side. A link-shaped protrusion with a sharp tip is provided around the entire periphery of the concave portion and protrudes in the axial direction, and the concave portion is provided with an elastic
A flexible seal ring is fitted, and the outer circumferential seat surface of the seal ring is inclined in a centripetal direction from the fastening seat surface and protrudes from the ring-shaped protrusion, and the seal ring is fitted into the front-filled recess. The bolt is filled and enters the bolt insertion hole to create a volume that can be filled, and extends radially outward toward the fastening seat side to become a volume that can be inserted as an annular collar, and extends toward the fastening seat surface. They succeeded in developing a seal/locking bolt characterized in that the annular flange is cut by the ring-shaped protrusion and the annular flange is interposed radially outward from the cut portion.

Hereinafter, some preferred embodiments of the present invention will be described in detail with reference to the drawings.

In the first embodiment illustrated in FIG. 1, reference numeral 1 denotes a head bolt, a metal head body 3 is provided with a shaft portion 2 having a screw 2A at its center, and the body 3 is parallel to the axis of the shaft portion 2. It has six twisting surfaces 4.

Of course, the bolt head 3 may be provided with no twisting surface 4, and its shape is arbitrary.

Furthermore, a concave portion 5 is formed on the seat surface 7 of the main body 3 and is concentric with the axis of the shaft portion 2, and a peripheral wall 6 of the concave portion 5 is a straight surface parallel to the axis of the bolt.

At the boundary between the seat surface 7 of the main body 3 and the peripheral wall 6 of the concave portion 5, an annular protrusion 8 is formed continuously in the downward direction, and a seal ring 9 fitted in the concave portion 5 pushes the protrusion 8 radially inward. By tightening it, it is firmly fitted and fixed so that it will not come off at least.

The outer peripheral wall of the annular projection 8 is formed into an inclined surface in the centripetal direction, and the projection 8 has a sharp point in the projecting direction.

The seal ring 9 fitted into the recess 5 is made of a relatively hard, elastic, flexible material such as nylon, polyethylene, rubber, synthetic rubber, aluminum, or lead, and is made of high-pressure polyethylene in the illustrated example. There is.

The inner circumferential wall surface 10 of the seal ring 9 is formed into a straight surface parallel to the nut axis, and one end surface of the ring 9 is fitted into the recessed portion 5, and is fixed by caulking the protrusion 8 in the embodiment. .

Of course, the fitting and fixing may be performed using an adhesive.

The fitting outer circumferential surface of the seal ring 9 is a straight surface, and the inner circumferential wall surface 10 of the ring 9 is shaped like a shaft 2 of the bolt 1.
The entire surface is concentrically surrounded, and the outer circumferential wall surface 11 of the portion protruding from the projection 8 is inclined in the centripetal direction, and in the first embodiment, the protruding portion of the outer circumferential wall surface 11 is an arcuate surface.

When the ring 9 is made of resin or rubber, the diameter of the straight inner circumferential wall surface 10 of the seal ring 9 may be made equal to or smaller than the diameter of the shaft portion 2 of the bolt 1. good.

When the seal ring 9 is made of extensible material such as aluminum or lead, the diameter of its inner peripheral wall surface 10 is formed to be equal to or larger than the diameter of the bolt shaft portion 2.

Referring to FIG. 2 and Table 1 below, a bolt 1 of type 1 in the JIS standard is illustrated.

Note that it is sufficient that h and 7M are in the range of 15 to 30%.

A seal ring 9 is fitted and fixed in correspondence with the recessed part 5 of the bolt 1 shown in FIG. 2 and Table 1, and the shape of the seal ring 9 is shown in FIG. 3 and Table 2 below. The details are as follows.

Note that it is sufficient that the amount of ring protrusion from the fastening seat surface 7 is in the range of 50 to 60%.

The first seal ring 9 is fitted into the recess 5 of the seat surface 7.
The headed bolt 1 according to the embodiment is twisted and tightened with the nut 12 illustrated in FIGS.
．． 15 to seal the seat surface 7 and prevent it from loosening.

In FIGS. 4 to 7, reference numeral 16 denotes a bolt insertion hole, through which the shaft portion 2 of the headed bolt 1 is passed, and the nut 12 is screwed onto the threaded portion 2A thereof in the twisting direction.

A seal ring 7 is attached to the concave portion 5 formed on the seat surface 7 of the bolt 1.
are fitted, the ring 7 protrudes from the seat surface 7, and
Since the outer circumferential wall surface 11 of the ring 7 is inclined in the centripetal direction, the protruding end of the ring 7 corresponds to the hole line of the bolt insertion hole 16 and enters slightly, as shown in FIG.

Therefore, by twisting the nut 12 in the fastening direction, the bolt 1 will be pulled in the axial direction, and the seal ring 9 will be pulled in.
will be subjected to compressive deformation force.

Due to this compressive deformation force, the portion of the fastening seat surface 7 that protrudes from the seat surface 7 is crushed so as to flow in and out in the radial direction, but the outer circumferential wall surface 11 of the protrusion is inclined in the centripetal direction. Based on this, the amount of flow inward in the radial direction becomes large, enters the bolt insertion hole 16, and is buried in the entire hole edge of the bolt insertion hole 16 itself, as shown in the enlarged arrow in FIG. In the outward direction, the flow is regulated by the peripheral wall 6 of the concave portion 5, the protrusion 8, etc., so that it flows slightly in the shape of a brim.

As the amount of twist of the nut 12 increases, the flow increases, and at the end of fastening when the protrusion 8 comes into contact with the material to be fastened 14, the seal ring 9 moves between the protrusion 8 and the concave portion 5.
The peripheral wall of the ring 9 prevents the shape from restoring outward in the radial direction, and the elastic force of the ring 9 causes the seat surface C to achieve a sealing effect in the radial direction as shown in FIG. Due to its elastic force, it tightly engages and contacts the hole wall as shown by the symbol E and the shaft portion 2 as shown by the symbol E to achieve a sealing effect inside and outside in the axial direction, and the symbol shown in FIG. The annular collar 18 is cut at the protrusion 8.

FIG. 8 shows a second embodiment of the present invention, in which the recessed portion 5 is formed into a dovetail groove shape. It is forcibly fitted into the portion 5 to further prevent it from falling out.

FIG. 9 shows a third embodiment of the present invention, in which an entry guide portion 9B having a diameter equal to or slightly smaller than the diameter of the bolt insertion hole 16 is provided at the tip of the ring 9 via a stepped portion 9A. With this configuration, the ring 9 can be inserted into the bolt insertion hole 16 more smoothly and accurately.

Furthermore, in the example shown in FIG. 10, a concave portion is also provided on the seat surface of the nut 12, into which a bowing ring 9 similar to that described above is fitted. According to this, both the nut 12 and the bolt head are provided with a concave portion. It can be expected to have a sealing effect and a loosening effect.

Furthermore, although not shown, the concave portion 5 of the bolt seat surface 7 may be polygonal in addition to the circular shape shown in the figure, and when it is polygonal, the fitting portion of the ring 9 will of course be similar to the polygonal shape. .

Further, in order to form the concave portion 5 on the bolt seat surface 7, the annular protrusion 8 is made to protrude larger than the seat surface 7, that is, the annular protrusion 8 is made to protrude integrally by the depth of the illustrated concave portion 5, and the portion surrounded by this protrusion is It may also be a concave portion.

According to the present invention, since the elastic and flexible seal ring 9 is fitted into the concave portion 5 formed on the seat surface 7 of the bolt head,
If the bolt 1 is screwed together with the nut 12, there is an advantage that a sealing effect by the seal ring 9 can be expected on the bolt seat surface 7 side.

Furthermore, since the seal ring 9 is tilted in the centripetal direction from the seat surface 7 and its outer peripheral wall surface 11 protrudes, the protruding portion of the ring 9 is always subjected to a radially inward elastic deformation force when screwed. It is compressed, and finally enters the bolt insertion hole 16, and the sealing engagement surface is formed at this part 17 by elastic force.
It has the advantage that it fills up the seat surface C and can also be expected to seal the seat surface C.

In addition, the seal ring has enough volume to be formed radially outward as an annular collar on the recessed portion, bolt insertion hole, and fastening seat surface side, thereby allowing the outer periphery of the bolt and the inner periphery of the hole to Not only can a sealing effect be exerted on the fastening seat side, but also a sealing effect in the radial direction can be exerted on the fastening seat side.
The annular flange is cut with a ring-shaped protrusion, and the annular flange is interposed radially outward from the cut part, so while the fastening is strong, the annular flange can also prevent the ring-shaped protrusion from deteriorating over time. can.

[Brief explanation of the drawing]

FIG. 1 is an abbreviated sectional view showing the first embodiment of the present invention, FIGS. 2 1 and 2 are a sectional view and a bottom view showing the bolt before ring fitting,
3. Figures 1 and 2 are sectional views and bottom views of the seal ring. Figures 4 to 7 are process sectional views showing examples of how the invention is used. Figure 8 is an abbreviated sectional view of the second embodiment of the invention. , FIG. 9 is an abbreviated cross-sectional view of a third embodiment of the present invention, and FIG. 10 is a completed fastening cross-sectional view showing another useful example of the use of the present invention. 1... Bolt, 2... Shaft, 3...
...Head body, 5...Recessed part, 7...
Seat surface, 9... Seal ring, 11...
Outer wall surface (projection).

Claims (1)

[Scope of utility model registration request] A concave portion concentric with the bolt axis is provided on the fastening seat surface of the bolt head, and a ring-shaped projection with a sharp tip protruding in the axial direction is provided around the entire periphery of the concave portion. A seal ring is fitted into the seal ring, and the outer circumferential seat surface of the seal ring is inclined in a centripetal direction from the fastening seat surface and protrudes from the ring-shaped projection, and the seal ring is filled in the recessed part and An annular flange that enters into the bolt insertion hole and has a volume that can be filled, and that extends radially outward toward the fastening seat side to have a volume that can be inserted as an annular collar, and that extends toward the fastening seat side. is cut by the ring-shaped protrusion, and an annular collar is interposed radially outward from the cut portion.