JPH0354975Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bolt sealing device used in a speed governor of an internal combustion engine.

[Prior Art] Generally, in a speed governor for an internal combustion engine, the maximum speed of the engine is limited by adjusting the screwing amount of a bolt against which a control lever is pressed. However, users sometimes operate the bolt incorrectly, and if this incorrect operation increases the maximum speed limit, excess fuel is supplied, leading to engine trouble. Therefore,
In order to prevent such engine troubles and to make it clear that engine troubles that occur are not covered by the product's warranty, the bolts mentioned above must be sealed. There is.

As such a sealing device, for example, the Jikko 56
-There is one described in Publication No. 42501. As shown in FIG.
has a bolt 2 screwed into it and a cylindrical part 3a,
The bolt 2 is pressed against the mounting part 1.
It consists of a nut 3 that fixes the cap to the mounting part 1, and a cap 4 that is fitted into the cylindrical part 3a so as to cover the bolt 2 and the nut 3. A part of the side wall of the cap 4 is folded back inward. The cap 4 is prevented from being removed by engaging the claw 4a formed with the head 2b of the bolt 2, thereby sealing the bolt 2.

[Problems to be solved by the invention] However, there were cases in which sealing could not be performed with the sealing device having the above configuration. That is, in the above case, the control lever C is pressed against the leg portion 2a of the bolt 2, but as shown in FIG. 8, a member (not shown) on the right side of the figure gets in the way. The leg portion 2a of the bolt 2 may not be able to pass through the mounting portion 1 due to reasons such as the following. In such a case,
There is no choice but to press the control lever C against the head 2b of the bolt 2. When the control lever C is pressed against the head 2a of the bolt 2 and the cap 4 shown in FIG. 7 is covered, the once adjusted position of the control lever C becomes out of alignment. For this reason, the conventional sealing device shown in FIG. 7 could not seal.

[Purpose of the invention] The present invention was made in consideration of the above circumstances, and provides a bolt sealing device that can securely seal even when the control lever is pressed against the head. The purpose is to

[Structure of the invention] In order to achieve the above-mentioned object, the present invention replaces a bolt with a leg screwed into a mounting part with a nut screwed into the leg between the head of the bolt and the mounting part. In the bolt fixing structure in which the bolt is fixed to the mounting part by pressing the bolt against the mounting part, an engaging part formed in a leg between the head of the bolt and the nut; The leg part between the head of the bolt and the nut is fitted so as to cover the engaging part so as to be movable in the axial direction of the leg part, and the outer peripheral side is pressed with one end surface against the nut. The present invention is characterized by comprising a cylindrical body that is immovably fixed to the leg portion in the axial direction by being engaged with the engaging portion by being crimped toward the inner circumferential side. In this case, it is preferable to use a flexible metal such as aluminum as the material for the cylindrical body in view of ease of crimping, but other metals such as steel may be used as long as it can be crimped. Other items may also be used. In addition, the engaging part may be a concave part or a convex part, and the shape is not subject to any restrictions as long as it can prevent the cylinder from moving in the axial direction when the cylinder is tightened. .

[Operation] After adjusting the position of the control lever by adjusting the screwing amount of the bolt, fix the bolt with the nut. Next, with the cylindrical body pressed against the nut, its outer periphery is crimped against the engaging portion of the bolt. Then, the cylindrical body is prevented from moving in the axial direction by the engaging portion. As a result, the nut is pinched between the mounting portion and the cylindrical body, and cannot move in the axial direction.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention, in which a leg portion 12a of a bolt 12 is screwed into a mounting portion 11 formed in a casing of a speed governor or the like. The head 12b of this bolt 12 and the mounting part 1
A nut 13 is screwed into the leg 12b between the bolt 12 and the bolt 12. After adjusting the position of the control lever C pressed against the head 12b by adjusting the screwing amount of the bolt 12, The bolt 12 is fixed by the screw. Such a configuration is similar to the conventional one.

However, in this embodiment, the cylinder 14 is screwed into the leg 12b between the head 12b of the bolt 12 and the nut 13 in advance. This cylinder 14
is pressed against the nut 13 to prevent its movement, and is made of a flexible metal such as aluminum. Further, the cylindrical body 14 is attached to the leg portion 12a of the bolt 12 by the nut 1.
3, four engaging grooves (engaging portions) 15 are formed at locations corresponding to the center portion of the inner periphery of the cylindrical body 14, extending in a direction orthogonal to the axis of the leg portion 12a. Adjacent ones of the engagement grooves 15 are orthogonal to each other, and the bottom surface 15a is formed in a flat shape, so that the cross section of the leg portion 12b in which the engagement grooves 15 are formed is rectangular. In addition, the reference numeral 16 in the figure
is a groove formed in the head 12b of the bolt 12, and serves as a mark for indicating the position of the engagement groove 15.

Next, the bolt 1 is
2, when sealing the cylinder 14 and the nut 1.
5 into bolt 12 in advance, then screw bolt 1
2 into the mounting part 11. After adjusting the position of the control lever C, the bolt 12 is fixed with the nut 13. Next, the cylindrical body 14 is pressed against the nut 13, and in this state, the cylindrical body 14 is tightened. In this case, the outer periphery of the cylinder 14 located on the extension line of the groove 16 was crimped in a direction perpendicular to the bottom surface 15a of the engagement groove 15, and then spaced 90° from the crimped part in the circumferential direction. Tighten the parts.
Then, the crimped portion of the cylinder 15 is inserted into the engagement groove 15.
, and is prevented from moving in the axial direction. As a result, the nut 13 is clamped by the cylindrical body 14 and the mounting portion 11, and cannot be moved.

When crimping, it is desirable to stamp the manufacturer's stamp at the same time to prove that the seal was made by the manufacturer. In this way, even if the user destroys the cylinder 14 and readjusts it, and then tightens another cylinder,
Whether or not readjustment has been performed can be confirmed by the presence or absence of markings.

Next, another embodiment of the present invention will be described.
In the following embodiments, parts similar to those in the above embodiments are denoted by the same reference numerals, and their explanations will be omitted.

The sealing device shown in FIGS. 4 to 6 has an annular engaging protrusion (engaging portion) 17 instead of the engaging groove 15 of the above-described embodiment. In this case, the inner diameter of the cylindrical body 14 is made slightly larger than the outer diameter of the engagement protrusion 17, and it goes without saying that no internal thread is formed on the inner periphery. To seal with this device, parts of the cylinder 14 on both sides of the engagement protrusion 17 are crimped.

[Effects of the invention] As explained above, according to the bolt sealing device according to the invention, the cylinder is movably provided in the leg between the head of the bolt and the nut in the axial direction, and the leg is movable in the axial direction. When the cylindrical body is pressed against the nut and the outer periphery is turned inward and crimped, it engages with the inner periphery of the cylindrical body and prevents the cylindrical body from moving in the axial direction. Since it has an engaging part that can be sealed, it is practical because it can be reliably sealed even with a type that presses the control lever against the head of the bolt, which could not be sealed conventionally. Great effects can be obtained.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a side sectional view thereof, FIG. 2A is a front view of the bolt, FIG. 2B is a side view of the bolt, and FIG. 3A is a side view of the bolt. is a front view of the cylinder, Figure 3B is a side sectional view of the cylinder, and Figure 4 is a front view of the cylinder.
6 to 6 show other embodiments of the present invention, FIG. 4 is a side sectional view thereof, FIG. 5A is a front view of the bolt, FIG. 5B is a side view of the bolt, and FIG. 6A is a side view of the bolt. 6B is a front view of the cylindrical body, FIG. 6B is a side sectional view of the cylindrical body, FIG. 7 is a side sectional view showing an example of a conventional sealing device, and FIG. 8 is a diagram showing that the sealing device shown in FIG. 7 can be applied. It is a side sectional view showing a case where it is not possible. 11... Mounting part, 12... Bolt, 12a...
Legs, 12b... Head, 13... Natsu, 14...
... Cylindrical body, 15... Engagement groove (engagement part), 17... Engagement protrusion (engagement part).

Claims (1)

[Scope of utility model registration request] A bolt whose legs are screwed into the mounting part is fixed to the mounting part by pressing a nut screwed into the leg between the head of the bolt and the mounting part against the mounting part. In the bolt fixing structure, an engaging part is formed in a leg between the head of the bolt and the nut, and an engaging part is formed in the leg between the head of the bolt and the nut. is fitted so as to be movable in the axial direction of the leg so as to cover the leg, and is engaged with the engaging portion by being crimped from the outer circumferential side to the inner circumferential side with one end surface pressed against the nut. A bolt sealing device characterized by comprising a cylindrical body that is fixed to the leg portion immovably in the axial direction by fitting together.