JPH08326731A - Sealing device for bolt - Google Patents

Abstract

PURPOSE: To provide a sealing device for a bolt where the structure of sealing is hard to become clear and the discharge of sealing is difficult, and also reuse is possible at the time of sealing. CONSTITUTION: A bolt 11 is screwed in a pump housing 14, and this bolt 11 is tightened to the pump housing 14 with a fastening nut 15. A sealing member 16 covers the periphery of the fastening nut 15. A pin 17 is press-fit in a shaft 13, being driven into an insertion hole 13b from one insertion hole 16b. The axial length of the pin 17 is set to be shorter than the inside diameter of the second engaging part 16c and besides to be longer than the inside diameter of an internal thread part 16b, so the sealing member 16 becomes impossible to be taken out of the bolt 11 by being locked to the pin 17. It is very difficult for a user who does not know the structure of a sealing device to cancel this sealing condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt sealing device, and more particularly to a bolt sealing device for positioning various stoppers of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as a bolt sealing device for positioning various stoppers of an internal combustion engine, holes are formed in a bolt to be sealed and a housing in which the bolt is mounted, and the wires passed through these holes are covered with lead or the like. A sealing device for tightly sealing is known.

However, in such sealing with a wire, since the location of the sealed bolt is clear and the wire can be easily cut, a general user can easily adjust the tightening of the bolt. The position of the stopper can be changed. For example, if the user releases the seal of the bolt that regulates the maximum opening of the adjusting lever of the fuel injection pump, and the maximum opening of the adjusting lever is set to an opening exceeding the manufacturer's guaranteed range, Problems such as emission of harmful substances occur. Originally, the bolt sealing device is for ensuring the range of product guarantee by the manufacturer, and should not be easily released by the user. In addition, the bolts must be able to be easily resealed after the bolts are unsealed for maintenance and the stopper position is adjusted.

In the bolt sealing device disclosed in Japanese Utility Model Publication No. 56-42501, the bolt and a tightening nut for tightening and fixing the bolt to a mounting portion are surrounded by a sealing cap, and the sealing cap is attached to the bolt head. A mating support portion is provided. For this reason, sealing can be easily completed simply by covering the bolt and the tightening nut with the sealing cap.
There is an effect that the location of the sealed bolt cannot be easily identified by the user.

[0005]

[Problems to be Solved by the Invention]
In the bolt sealing device disclosed in Japanese Patent Laid-Open No. 6-42501, it is necessary to break the sealing cap in order to readjust the sealed bolt. Therefore, there is a problem that another sealing cap is required for resealing after adjusting the tightening of the bolt.

The present invention has been made in order to solve such a problem, and provides a bolt sealing device in which the sealing structure is difficult to be identified, the sealing is difficult to release, and the bolt can be reused at the time of resealing. With the goal.

[0007]

In order to achieve the above object, a bolt sealing device according to claim 1 of the present invention comprises a bolt which is screwed to an attachment portion and fixed to the attachment portion by a tightening nut. A sealing device for sealing, which has a first insertion hole penetrating in a radial direction and formed in a lid shape capable of covering the head and a bolt formed of a shaft portion screw-connected to the mounting portion. A sealing member in which the first insertion hole is located closer to the mounting portion than the head is in a state of covering the bolt, the sealing member covers the bolt, and the first insertion hole is It is inserted from the first insertion hole so as not to be exposed to the outside from the sealing member in a state in which it is located closer to the mounting portion than the head, and is detachable to at least one of the bolt and the sealing member. Installed from the bolt A pin member for restricting the movement of the sealing member in the Rihazusu direction, characterized in that it comprises a.

A bolt sealing device according to a second aspect of the present invention is the bolt sealing device according to the first aspect, wherein the pin member is attached to the sealing member and the pin member is locked to the head portion. This restricts the movement of the sealing member in the direction of removing the bolt from the bolt. The bolt sealing device according to claim 3 of the present invention is the bolt sealing device according to claim 1 or 2, wherein the bolt has a second insertion hole penetrating the shaft portion, and the sealing member. Has a small inner diameter portion from the opening side, and a large inner diameter portion in which the inner diameter is larger than the small inner diameter portion and in which the first insertion hole is formed, and the axial length of the pin member is the inner diameter of the small inner diameter portion. Longer than the inner diameter of the large inner diameter portion,
The first insertion hole and the second insertion hole are aligned on the same straight line in a state where the sealing member covers the bolt and the first insertion hole is located closer to the mounting portion than the head portion. In this state, the pin member inserted into the second insertion hole from the first insertion hole is attached to the shaft portion in the space of the large inner diameter portion, and the small inner diameter portion is the pin. The movement of the sealing member in the direction of removing from the bolt is restricted by being locked to the member.

[0009]

According to the sealing device of the present invention,
The bolt is covered by a lid-shaped sealing member, and a pin member is detachably attached to at least one of the bolt and the sealing member so as not to be exposed to the outside from the sealing member, and the bolt is sealed. . As a result, it becomes difficult to identify the presence of the pin member from the outside of the sealing member, and it is difficult to understand the sealing structure.

Further, since the sealing member can be easily removed from the bolt by removing the pin member, the used sealing member and pin member can be reused when the bolt is resealed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show a bolt sealing device according to a first embodiment of the present invention. The first embodiment is an example in which the bolt sealing device of the present invention is applied to a stopper that regulates the maximum opening position of the adjusting lever of a governor in a fuel injection pump of a diesel engine.

As shown in FIG. 1, a bolt 11 is screwed to a pump housing 14 which is a mounting portion, and the bolt 1
1 is fastened and fixed to the pump housing 14 with a tightening nut 15. The sealing member 16 covers around the bolt 11 and the tightening nut 15. In the state shown in FIG. 1, the sealing member 16 is rotatable around the bolt 11.

As shown in FIG. 2, the bolt 11 has a head 12
And a shaft portion 13, and a male screw portion 12a and a male screw portion 13a are formed on the head portion and the shaft portion 13, respectively. A groove 12b into which a tool is fitted when the bolt is turned is formed on the end surface of the head 12. Head 1 of shaft 13
In the vicinity of the second side, an insertion hole 13b that is a second insertion hole that passes through the shaft center of the bolt 11 and penetrates the shaft portion 13 in the radial direction is formed. A female screw portion (not shown) is formed on the pump housing 14, and by adjusting the tightening amount of the bolt 11 into the pump housing 14, the protrusion amount of the shaft portion 13 into the pump housing 14 on the side opposite to the head portion 12 side. Is determined.

As shown in FIG. 3, the tightening nut 15 comprises a hexagonal portion 15a and a cylindrical portion 15b, which are integrally formed. It is possible to prevent the bolt 11 from loosening by tightening the bolt 11 having the determined protrusion amount into the pump housing 14 with the tightening nut 15 to the pump housing 14. In the present invention, it is also possible to separately form the hexagonal portion and the cylindrical portion.

As shown in FIG. 4, the sealing member 16 is formed in a cylindrical shape with a bottom, and the inner peripheral wall of the sealing member 16 has a first fitting portion 16a from the opening side and a female screw portion which is a small inner diameter portion. 1
6b, a second fitting portion 16c which is a large inner diameter portion is formed. The side wall of the sealing member 16 forming the second fitting portion 16c is provided on the female screw portion 16b side of the second fitting portion 16c.
Two insertion holes 16d, which are first insertion holes and pass through the center of the axis in the radial direction, are formed. First fitting portion 16a
The inner diameter of is formed to be slightly larger than the outer diameter of the cylindrical portion 15b. The female screw portion 16b can be screwed to the male screw portion 12a formed on the head 12. The inner diameter of the second fitting portion 16c is formed to be larger than the outer diameter of the head portion 12.

Next, the procedure for sealing the bolt will be described with reference to FIG. The tightening nut 15 is previously tightened on the shaft portion 13 side of the bolt 11, and the bolt 11 is tightened in the pump housing 14. When the end portion of the shaft portion 13 on the side opposite to the head portion 12 is projected into the pump housing 14 by a predetermined amount, the tightening nut 15 is tightened to fix the bolt 11 to the pump housing 14. This prevents the bolt 11 from loosening.

The opening side of the sealing member 16 is inserted from the head 12 side of the bolt 11. The female screw portion 16b is the male screw portion 12a.
When it is locked at, the sealing member 16 is rotated. Sealing member 16
By continuing to turn, the threaded connection between the female screw portion 16b and the male screw portion 12a is released, so that the sealing member 16 can be further inserted toward the pump housing 14. At this time, the insertion hole 16d passes through the head 12 in the insertion direction.

The insertion hole 13b of the bolt 11 and the sealing member 16
The insertion hole 16d is aligned with the insertion hole 16d and the pin 17, which is a pin member, is tapped from one insertion hole 16b toward the insertion hole 13b of the shaft portion 13. The diameter of the pin 17 is the insertion hole 1
It is smaller than the inner diameter of 6d and is set to be press fit into the insertion hole 13b. The axial length of the pin 17 is set to be shorter than the inner diameter of the second fitting portion 16c and longer than the inner diameter of the female screw portion 16b. Therefore, when the pin 17 passes through one of the insertion holes 16d and is press-fitted into the shaft portion 13 to be attached to the shaft portion 13 within the space of the second fitting portion 16c,
Since the axial length of the pin 17 is longer than the inner diameter of the female screw portion 16b, the sealing member 16 is locked by the pin 17 and cannot be removed from the bolt. This completes the sealing of the bolt 11.

When a general user who does not know the sealing structure sees the state in which the bolt 11 is sealed by the sealing member 16 as shown in FIG. 1, the bolt 11 which determines the opening degree of the adjusting lever is the sealing member. It is impossible to determine that it is covered by 16. In addition, even if the bolt 1
Insertion hole 1
6d and the insertion hole 13b are not necessarily aligned on the same straight line, and various parts are arranged in the engine room around the sealing member 16, so that the sealing member 16 from the bolt 11 is It is difficult to visually recognize the presence of the pin 17 that restricts removal from the outside. It is very difficult for a user who does not know the structure of the sealing device of the first embodiment to release the sealed state.

When adjusting the tightening amount of the bolt 11 in a maintenance factory, etc., the tool used when the insertion hole 13b and the insertion hole 16d are aligned on the same straight line and the pin 17 is press-fitted into the shaft portion 13 Then, the pin 17 is knocked out from the shaft portion 13. Thereby, the sealing member 16 can be removed from the bolt 11. After adjusting the tightening amount of the bolt 11, the bolt 11 can be resealed by using the sealing member 16 and the pin 17 which have been sealed.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
Shown in The same components as those in the first embodiment are designated by the same reference numerals. The pin 18 is press-fitted into the one insertion hole 16d so as not to be exposed to the outside of the sealing member 16, and does not reach the shaft portion 13. Although the sealing member 16 is rotatable around the bolt 11,
Since the pin 18 is locked to the head portion 12 when trying to remove, the sealing member 16 cannot be removed.

In order to knock out the pin 18 from the sealing member 16, a needle-shaped tool which can pass through the insertion hole 16d and the insertion hole 13b from an insertion hole 16d different from the insertion hole 16d in which the pin 18 is inserted is used. Insert the pin 18 into the insertion hole 16
Knock out from d. It is difficult for a general user who does not know the sealing structure of the second embodiment to release the sealing structure of the second embodiment.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention.
And shown in FIG. The same components as those in the first embodiment are designated by the same reference numerals. The head 21 of the bolt 20 is provided with notches 21a on both sides in the radial direction. On the inner peripheral wall of the sealing member 23, the first fitting portion 23a and the first fitting portion 2 are provided from the opening side.
A second fitting portion 23b having a smaller diameter than 3a is formed.
On the first fitting portion 23a side of the second fitting portion 23b, a locking portion 23c which has substantially the same cross-sectional shape as the head portion 21 and can pass through the head portion 21 when the sealing member 23 is inserted into the bolt 20. Are formed. Sealing member 2 forming this locking portion 23c
Insertion hole 2 that penetrates the side wall of 3 in the radial direction off the axis center
3d is formed.

When the sealing member 23 is inserted into the bolt 20, the locking portion 23c passes through the head portion 21 and the insertion hole 23d is located closer to the pump housing 14 than the head portion 21, the pin 24 is inserted into the insertion hole 23d. When the pin 24 is press-fitted, the pin 24 is locked to the head 21, so that the sealing member 23 cannot be removed from the bolt 20. In the state shown in FIGS. 6 and 7 in which the bolt 20 is sealed by the sealing member 23, the sealing member 23 is rotatable around the bolt 20.

It is difficult for a general user who does not know the sealing structure of the third embodiment to release the sealing structure of the third embodiment. In the third embodiment, the head 21 of the bolt 20 is provided with the notch 21 a, and the head 21 is provided on the inner peripheral wall of the sealing member 23.
Although the locking portion 23c capable of passing through is provided, in the present invention, both the head portion of the bolt and the inner peripheral wall of the sealing member can be formed in a circular shape. Further, in the present invention, it is also possible to restrict the removal of the sealing member from the bolt by cutting out the periphery of the shaft portion of the bolt and fitting the pin member into the notch.

In the embodiment of the present invention described above, the sealing member is formed into a cylindrical shape with a bottom. However, in the present invention, if the sealing structure that hides the bolt is a lid-like shape that cannot be seen from the outside, it is sealed. The stop member can be constructed in any shape.

[Brief description of drawings]

FIG. 1 is a sectional view showing a bolt sealing device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a bolt of the first embodiment.

FIG. 3 is a perspective view showing a tightening nut of the first embodiment.

FIG. 4 is a perspective half sectional view showing a sealing member of the first embodiment.

FIG. 5 is a sectional view showing a bolt sealing device according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a bolt sealing device according to a third embodiment of the present invention.

7 is a sectional view taken along line VII-VII of FIG.

[Explanation of symbols]

 11 Bolts 12 Head 13 Shaft 13b Insertion Hole (Second Insertion Hole) 14 Pump Housing (Mounting Part) 15 Tightening Nut 16 Sealing Member 16b Female Thread Part (Small Inner Diameter Part) 16c Second Fitting Part (Large Inner Diameter) Part) 16d insertion hole (first insertion hole) 17 pin (pin member) 18 pin (pin member) 20 bolt 23 sealing member 23d insertion hole 24 pin (pin member)

Claims (3)

[Claims] 1. A sealing device which is screwed to a mounting portion and seals a bolt fixed to the mounting portion with a tightening nut, the bolt comprising a head portion and a shaft portion screwed to the mounting portion. Has a first insertion hole penetrating in the radial direction and can cover the bolt, and in the state where the bolt is covered, the first insertion hole is closer to the mounting portion than the head. A sealing member located at, the sealing member covers the bolt, and the first insertion hole is located closer to the mounting portion than the head, so as not to be exposed to the outside from the sealing member. A pin member that is inserted through the first insertion hole, is detachably attached to at least one of the bolt and the sealing member, and restricts movement of the sealing member in a direction of removing from the bolt. Characterized by Bolt sealing device. 2. The pin member is attached to the sealing member, and the pin member is locked to the head,
The bolt sealing device according to claim 1, wherein movement of the sealing member in a direction of removing from the bolt is restricted. 3. The second bolt penetrates the shaft portion.
And a sealing member having a small inner diameter portion from the opening side and a large inner diameter portion having an inner diameter larger than that of the small inner diameter portion and in which the first insertion hole is formed, Has a shaft length longer than the inner diameter of the small inner diameter portion and shorter than the inner diameter of the large inner diameter portion, the sealing member covers the bolt, and the first insertion hole is attached to the head portion more than the head portion. The first insertion hole and the second insertion hole can be aligned on the same straight line in the state of being located on the side of the section, and in this state, the first insertion hole and the second insertion hole are inserted into the second insertion hole from the first insertion hole. The pin member is attached to the shaft portion in the space of the large inner diameter portion, and the small inner diameter portion is locked to the pin member, thereby restricting the movement of the sealing member in the direction of removing from the bolt. The bolt sealing device according to claim 1 or 2, wherein: