JPH0942257A - Drive bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive bolt to easily fasten other member only by driving it in a member to be fastened and generate a strong fastening force. SOLUTION: A drive bolt comprises a head part 1; and a stem part 2 protruding from a seat surface 1a. Teeth 6 are formed in a multistage in the outer periphery of the stem part 2 or a thread is formed in a helical state. The teeth 6 and the thread have a slope 7 inclining from the outer peripheral side toward the inner peripheral side along a drive direction, and the back of the slope 7 has a wall surface 8 formed in a shape wherein during drive, the tip part 9 on the outer peripheral side of a slope is deformable in a direction reverse to a drive direction. A tip part 9 on the outer peripheral side of a slope has a diameter 1 higher than the inside diameter of the hole part 4 of the member 3 to be fastened, and during drive, the tip part is bent to the inner peripheral side, and when drive is completed, the tip part is protruded from the outer peripheral side and engaged with the inner wall 5 of a hole part 4. The seat surface 1a is provided with a flange part, and a spring member through which a drive bolt is energized in a pull-off direction is arranged between the flange part and the shaft part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving bolt for driving another member to a member to be fastened by driving it into a hole provided in the member to be fastened.

[0002]

2. Description of the Related Art Conventionally, when another member such as a cylinder head is fastened to a fastened member such as a cylinder of an internal combustion engine,
A threaded portion is formed on the inner wall of the casting hole provided in the member to be fastened in advance to provide a screw hole, and a bolt is inserted into the fastening member through a through hole provided corresponding to the casting hole. Then, the bolt is screwed into the screw hole. However, when doing the above, it is necessary to perform a complicated process of forming the screw hole in the casting hole to form the screw hole and further screwing a bolt into the screw hole. There is inconvenience.

[0003]

In order to solve such inconvenience, the present invention can easily fasten other members only by driving into the holes provided in the fastened member, and has a strong fastening force. The present invention provides a driving bolt capable of obtaining

[0004]

In order to achieve the above object, the first aspect of the driving bolt of the present invention is to drive another member into the member to be fastened by driving it into a hole provided in the member to be fastened. Is a driving bolt for fastening the head portion and a shaft portion projecting from a seating surface of the head portion and having a diameter smaller than the inner diameter of the hole portion of the member to be fastened, the shaft portion being provided on the outer periphery of the shaft portion. The integrally formed teeth are provided in multiple stages, and the teeth have an inclined surface that inclines from the outer peripheral side to the inner peripheral side along the driving direction, and the tip on the outer peripheral side of the inclined surface when driving on the back surface of the inclined surface. The portion has a wall surface of a shape that is deformable on the opposite side to the driving direction, the tip of the outer peripheral side of the inclined surface has a diameter larger than the inner diameter of the hole of the member to be fastened, and is bent toward the inner peripheral side during driving. After the completion of driving, it projects to the outer peripheral side and the hole of the fastened member Characterized in that it meshes with the inner wall.

The wall surface provided on the back surface of the inclined surface of the tooth is such that when the driving bolt of the present invention is driven, the tip end on the outer peripheral side of the inclined surface is deformable to the side opposite to the driving direction. It is preferable that the tip end on the outer peripheral side of the surface is formed perpendicularly to the axis of the driving bolt, the inclined surface is a first inclined surface, and the first end portion on the outer peripheral side of the first inclined surface is the first inclined surface. More preferably, it is formed as a second inclined surface that is inclined from the outer peripheral side to the inner peripheral side at an angle deeper than the first inclined surface in the same direction as the inclined surface.

The driving bolt according to the first aspect of the present invention is
When the head is hit with a hammer or the like, it is driven into the hole of the member to be fastened via another member. At this time,
The tip of the tooth on the outer peripheral side of the inclined surface has a diameter larger than the inner diameter of the hole of the member to be fastened, but the tip bends to the opposite side in the driving direction at the time of driving, so that the hole is easily inserted into the hole. Be inserted. Then, when the driving is completed, the tip portion which is bent at the time of driving is restored to the original shape. Since the tip end of the tooth on the outer peripheral side of the inclined surface is formed to have a diameter larger than the inner diameter of the hole of the member to be fastened, by returning to the original shape as described above, it bites into the inner wall of the hole. Mesh with.

Therefore, in the driving bolt of the present invention, other members can be easily fastened to the fastened member by merely striking the head and driving it, and further, it bites into the inner wall of the hole and meshes. Since the tips of the teeth on the outer peripheral side of the inclined surface are prevented from coming off, a strong fastening force can be obtained.

A second aspect of the driving bolt of the present invention is a driving bolt for driving another member to the member to be fastened by driving it into a hole provided in the member to be fastened, which is a screwing tool. It comprises a head portion having an engageable engaging portion, and a shaft portion projecting from a seating surface of the head portion and having a diameter smaller than the inner diameter of the hole portion of the member to be fastened, the shaft portion being provided on the outer periphery of the shaft portion. An integrally formed screw thread is provided in a spiral shape, and the screw thread has an inclined surface that inclines from the outer peripheral side to the inner peripheral side along the driving direction, and when driving the back surface of the inclined surface, the outer peripheral surface of the inclined surface is inclined. The tip end on the side has a wall surface that is deformable on the opposite side to the driving direction, and the tip on the outer peripheral side of the inclined surface has a diameter larger than the inner diameter of the hole portion of the member to be fastened, and the inner periphery at the time of driving. Side, and after driving is complete, it projects to the outer peripheral side Characterized in that it meshes with the inner wall of the hole of the member.

As in the case of the teeth of the first aspect, the wall surface provided on the back surface of the inclined surface of the screw thread is driven by the tip end portion on the outer peripheral side of the inclined surface when the driving bolt of the present invention is driven. In order to be deformable to the opposite side in the direction, it is preferable that the tip end on the outer peripheral side of the inclined surface is formed perpendicularly to the axis of the driving bolt, and the inclined surface is the first inclined surface. The first inclined surface is formed as a second inclined surface that inclines from the outer peripheral side to the inner peripheral side at an angle deeper than the first inclined surface in the same direction as the first inclined surface. Is more preferable.

The driving bolt according to the second aspect of the present invention is
First, as in the case of the first aspect, when the head is hit with a hammer or the like, it is driven into the hole of the member to be fastened through another member, but at this time, the thread is the first.
Since it acts in the same manner as the tooth in the case of the driving bolt of the aspect of, the other member can be easily fastened to the fastened member only by the operation of striking the head and driving it, and the inner wall of the hole is A strong fastening force can be obtained because the teeth that bite into and mesh with each other are prevented from coming off by the tip end portions on the outer peripheral side of the inclined surface. Moreover, in the driving bolt according to the second aspect of the present invention, since the screw thread is spirally provided on the outer periphery of the shaft portion, it is provided on the head portion after being driven into the hole portion as described above. By engaging and screwing a screwing tool into the engaged portion, the tip end of the outer peripheral side of the inclined surface of the screw thread bites further into the inner wall of the hole,
A stronger fastening force can be obtained.

Further, the driving bolt of the present invention is, in each of the above aspects, provided with a spring member between the seat surface of the head portion and the shaft portion for urging the driving bolt in the pulling-out direction after the driving is completed. Is characterized by.

According to the driving bolt, the tip end of the tooth or the screw thread on the outer peripheral side of the inclined surface is reliably meshed with the inner wall of the hole by being urged in the pulling direction by the spring member after the driving is completed. In addition, a stronger fastening force can be obtained.

[0013]

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

First, an embodiment of the first aspect of the driving bolt of the present invention will be described.

FIG. 1 (a) is a side view showing an embodiment of a driving bolt of the first aspect of the present invention, and FIG. 1 (b) is FIG.
1A is an explanatory sectional view showing a state where the driving bolt shown in FIG. 1A is driven into a member to be fastened, and FIG. 1C is an enlarged sectional view of a C portion in FIG. 1B. 2 (a) is a side view showing another embodiment of the driving bolt of the first aspect of the present invention, FIG.
FIG. 3B is an explanatory sectional view showing a state where the driving bolt shown in FIG. 2A is driven into a member to be fastened, and FIG.
Is a side view showing still another embodiment of the driving bolt of the first aspect of the present invention, and FIG. 3 (b) is an explanatory cross-sectional view showing a state where the driving bolt shown in FIG. 3 (a) is driven into a member to be fastened. It is a figure.

The driving bolt according to the first aspect of the present invention is
As shown in FIG. 1A, the head portion 1 and a shaft portion 2 that vertically protrudes from a seat surface 1a of the head portion 1 are formed.
As shown in (b), it is formed in a shape similar to the inner wall 5 of the hole 4 of the member 3 to be fastened and having a diameter smaller than the inner diameter of the inner wall 5. FIG.
As shown in (a), teeth 6 integrally formed with the shaft 2 are provided in multiple stages on the outer circumference of the shaft 2, and the teeth 6 are arranged from the outer circumference to the inner circumference along the driving direction. And a second inclined surface 8 inclined from the outer peripheral side to the inner peripheral side at a deeper angle in the same direction as the inclined surface 7 on the back surface of the inclined surface 7, At the intersection of the inclined surfaces 7 and 8, a top portion 9 having a diameter larger than the inner diameter of the inner wall 5 of the hole portion 4 is formed as an outer peripheral end portion of the inclined surface 7.

Further, the top surface 1b of the head portion 1 has a hemispherical shape projecting to the side opposite to the shaft portion 2, and the shaft portion 2 has a guide portion having a diameter smaller than that of the shaft portion 2 in front of the teeth 6. 10 are formed. The guide portion 10 guides the driving bolt into the hole portion 4, and the tip end portion thereof has a taper portion 10a whose diameter is reduced from the outer peripheral side to the inner peripheral side in order to facilitate the guide.
Are formed.

The fastened member 3 is a cylinder of an internal combustion engine or the like made of, for example, an aluminum-based metal which is a relatively soft material, and the hole portion 4 is formed in advance as a cast hole. On the other hand, the driving bolt of the present invention is made of a material harder than the aluminum-based metal such as steel.

The driving bolt shown in FIG. 1 (a) is as shown in FIG.
As shown in (b), another member 11 having a through hole 11a corresponding to the hole 4 of the member to be fastened 3 is overlaid,
The guide portion 10 of the driving bolt is inserted into the hole portion 4 through the through hole 11a, and the head portion 1 is manually operated with a hammer or the like.
Alternatively, it is driven into the hole 4 by hitting it with a mechanical force.

The top portion 9 of the tooth 6 is formed to have a diameter larger than the inner diameter of the inner wall 5 of the hole 4 as described above, but at the time of driving, the inner peripheral side (as shown in phantom in FIG. 1C). Since it bends in the direction opposite to the driving direction), the driving bolt can be easily fitted into the hole 4. Next, when the driving is completed and the driving bolt is fitted into the hole 4, the top 9 returns to its original shape and bulges to the outer peripheral side of the shaft 2 and bites into the inner wall 5 of the hole 4. Mesh with. As a result, the driving bolt is prevented from coming off by the top portions 9 of the teeth 6 that bite into and mesh with the inner wall 5, and a strong fastening force is obtained.

As shown in FIG. 2A, the driving bolt according to the first aspect of the present invention is provided with a flange portion 12 having a larger diameter than the head portion 1 on the seat surface 1a of the head portion 1, and the flange portion A disc spring 13 may be provided between the shaft 12 and the shaft 12 to urge the driving bolt in the pull-out direction after the driving is completed. According to the driving bolt, as shown in FIG. 2B, another member 11 corresponding to the hole 4 of the member 3 to be fastened and having the through hole 11b having a slightly larger diameter than the hole 4 is formed. As in the case of the driving bolt shown in FIG. 1A, the driving bolt is inserted into the hole 4 and the head 1 is struck, so that the driving bolt can be easily driven into the hole 4.

According to the driving bolt shown in FIG. 2 (a),
By the driving, the tops 9 of the teeth 6 bite into the inner wall 5 of the hole 4 and are engaged with each other to prevent the teeth 6 from coming off, and after the driving, the disc spring 13 urges the driving bolts in the pulling-out direction. The top 9 of the inner wall 5
It bites into and engages securely to obtain a stronger fastening force.

Further, the driving bolt according to the first aspect of the present invention, as shown in FIG. 3 (a), has the hole 4a of the member 3 to be fastened.
From the opening to the bottom, the inner walls 5a, 5a facing each other
When the diameter is reduced so that the angle formed by the two becomes θ, the lines A, A connecting the tops 9 of the teeth 6 provided in the multistage are formed on the inner wall 5.
a and 5a are parallel, that is, FIG. 3 (b)
As shown, it is preferable that the angle formed by the lines A, A connecting the top portions 9 on both sides of the side view shaft portion 2 is θ. By doing so, the driving bolt is easily fitted into the hole 4a of the member to be fastened 3, and
A fastening force is generated on the entire surface of the inner wall 5a in conformity with the shape of the hole 4a.

Next, an embodiment of the second aspect of the driving bolt of the present invention will be described.

FIG. 4 (a) is a side view showing an embodiment of the driving bolt of the second aspect of the present invention, and FIG. 4 (b) is FIG.
5 (a) is a plan view of the head of the driving bolt shown in FIG. 4 (a), and FIG. 4 (c) is a plan view of the head of the driving bolt shown in FIG. 4 (a). ) Is a side view showing another embodiment of the driving bolt of the second aspect of the present invention, and FIG. 5 (b) is an explanatory sectional view showing a state in which the driving bolt shown in FIG. 5 (a) is driven into a member to be fastened. Figure, Figure 5
5C is a plan view of the head of the driving bolt shown in FIG.

The driving bolt according to the second aspect of the present invention is
As shown in FIG. 4A, the head 21 and the seat surface 2 of the head 21.
1a and a shaft portion 22 that vertically projects from the shaft portion 22.
Is the inner wall 5 of the hole 4 of the member 3 to be fastened as shown in FIG.
And a diameter smaller than the inner diameter of the inner wall 5. As shown in FIG. 4A, a screw thread 23 integrally formed with the shaft portion 22 is spirally provided on the outer periphery of the shaft portion 22, and the screw thread 23 is formed on the outer periphery along the driving direction. With the first inclined surface 24 inclined from the side to the inner peripheral side,
On the back surface of the inclined surface 24, a second inclined surface 25 inclined in the same direction as the inclined surface 24 and from the outer peripheral side to the inner peripheral side at a deeper angle.
At the intersection of the inclined surfaces 24, 25, a top portion 26 having a diameter larger than the inner diameter of the inner wall 5 of the hole 4 is formed as the outer peripheral side end portion of the inclined surface 24. The top surface 21b of the head portion 21 is a flat surface, and a hexagonal hole portion 27 into which a hexagon wrench as a screwing tool is engaged is provided at the center thereof as shown in FIG. 4 (c). There is.

Further, on the shaft portion 22, the guide portion 10 and the taper portion 10 in the first embodiment are provided in front of the thread 23.
A guide part 28 and a taper part 28a similar to a are formed.

The driving bolt shown in FIG. 4A is the same as that shown in FIG.
As shown in (c), another member 11 having a through hole 11b corresponding to the hole 4 of the member 3 to be fastened is overlapped,
The guide portion 28 of the driving bolt is inserted into the hole portion 4 through the through hole 11a, and the head portion 21 is hammered as described above to be driven into the hole portion 4.

The top portion 26 of the screw thread 23 is formed to have a diameter larger than the inner diameter of the inner wall 5 of the hole portion 4 as described above, but as in the case of the first embodiment shown in FIG. 1 (c). During driving, the driving bolt bends to the inner peripheral side (opposite to the driving direction), the driving bolt is easily fitted into the hole portion 4, and when the driving is completed, the top portion 26 returns to its original shape and the shaft portion 22 To the outer wall of the hole and bite into the inner wall 5 of the hole 4 to engage with it. As a result, the driving bolt is engaged with the inner wall 5 by engaging the top portion 26 of the thread 23.
It prevents it from coming off and provides a strong fastening force.

After the driving is completed, the driving bolt is further engaged with a hexagon wrench (not shown) in the hole 27 shown in FIG. 4 (c) and screwed in as shown in FIG. 4 (b). By doing so, the bite of the top portion 26 of the screw thread 23 meshing with the inner wall 5 of the hole 4 into the inner wall 5 is increased, and a stronger fastening force is obtained.

As shown in FIG. 5 (a), the driving bolt according to the second aspect of the present invention is provided with a flange portion 12 having a larger diameter than the head portion 21 on the seating surface 21a of the head portion 21. A disc spring 13 may be provided between the shaft 12 and the shaft portion 22 to urge the driving bolt in the pull-out direction after the driving is completed. According to the driving bolt, as shown in FIG. 5 (b), the head 21 is easily driven into the hole 4 by striking the head portion 21 in the same manner as in the driving bolt shown in FIG. 4 (a). Next, a hexagon wrench (not shown) is engaged with and screwed into the hole 27 shown in FIG. 5C, whereby the bite of the top portion 26 with respect to the inner wall 5 is increased, and a stronger fastening force is obtained. Moreover, since the coned disc spring 13 urges the driving bolt in the pull-out direction, the top portion 26 of the screw thread 23 that meshes with the inner wall 5 as described above more surely meshes with the inner wall 5 and a stronger fastening. Power is gained.

In each of the embodiments of the second aspect of the present invention, a hole portion 27 into which a hexagon wrench is engaged is provided on the top surface 1b of the head 1 as an engaging portion to be engaged with the screwing tool. However, the shape of the engaging portion is not limited to this, and a minus or plus shaped groove portion for engaging a minus driver or a plus driver may be provided on the top surface 1b. The head 1 may be formed in a hexagonal shape in plan view so that the spanner is engaged with the side surface of the head.

In each of the embodiments of the present invention, the tooth 6 is used.
Alternatively, the back surface of the screw thread 23 is provided with the second inclined surfaces 8 and 25 inclined at a deeper angle than the first inclined surfaces 7 and 24. However, instead of the inclined surfaces 8 and 25, the vertices 9 and 25 are provided. The wall may be formed perpendicular to the axis of the driving bolt.

Further, in each of the embodiments of the present invention, the disc spring 13 is used as the spring member for urging the driving bolt in the pull-out direction, but the spring member is not limited to this, and a spring washer or the like is used. Other springs may be used.

[Brief description of drawings]

FIG. 1 (a) is a side view showing an embodiment of a driving bolt of a first aspect of the present invention, and FIG. 1 (b) is FIG.
FIG. 1A is an explanatory sectional view showing a state where the driving bolt shown in FIG. 1A is driven into a member to be fastened, and FIG. 1C is an enlarged sectional view of a C portion of FIG. 1B.

2 (a) is a side view showing another embodiment of the driving bolt of the first aspect of the present invention, and FIG. 2 (b) is FIG.
Explanatory sectional view showing a state in which the driving bolt shown in (a) is driven into a member to be fastened.

FIG. 3 (a) is a side view showing still another embodiment of the driving bolt of the first aspect of the present invention, and FIG. 3 (b) is a member to which the driving bolt shown in FIG. 3 (a) is fastened. Explanatory sectional view showing a state of being driven into.

FIG. 4 (a) is a side view showing an embodiment of a driving bolt of the second aspect of the present invention, and FIG. 4 (b) is FIG.
FIG. 4A is an explanatory cross-sectional view showing a state where the driving bolt shown in FIG. 4A is driven into a member to be fastened, and FIG. 4C is a plan view of the head of the driving bolt shown in FIG. 4A.

5 (a) is a side view showing another embodiment of the driving bolt of the second aspect of the present invention, and FIG. 5 (b) is FIG.
5A is an explanatory cross-sectional view showing a state where the driving bolt shown in FIG. 5A is driven into a member to be fastened, and FIG. 5C is a plan view of the head of the driving bolt shown in FIG. 5A.

[Explanation of symbols]

1, 21 ... Head, 1a, 21a ... Seating surface, 1b, 21
b ... Top surface, 2, 22 ... Shaft part, 3 ... Fastened member, 4
… Hole part, 5… Inner wall, 6… Tooth, 7,24… Slope,
8, 25 ... Wall surface on the back surface of the inclined surface, 9, 26 ... Tip of the inclined surface outer peripheral portion, 12 ... Flange portion, 13 ... Spring member, 23 ... Screw thread, 27 ... Engaging portion.

Claims (3)

[Claims] 1. A driving bolt for fastening another member to a member to be fastened by driving it into a hole provided in the member to be fastened, the head being projected from a head and a seating surface of the head. A tooth having a diameter smaller than the inner diameter of the hole of the fastening member is provided on the outer periphery of the shaft portion in multiple stages, and the teeth are formed inward from the outer peripheral side along the driving direction. The inclined surface is provided with a slanting surface on the circumferential side, and when the back surface of the slanted surface is driven, a tip end portion of the slanted surface outer peripheral side is provided with a wall surface that is deformable to the opposite side to the driving direction. The tip portion has a diameter larger than the inner diameter of the hole of the member to be fastened, bends toward the inner peripheral side at the time of driving, and bulges to the outer peripheral side after completion of driving and meshes with the inner wall of the hole at the member to be fastened. Characteristic driving bolt. 2. A driving bolt for fastening another member to the member to be fastened by driving it into a hole provided in the member to be fastened, the head having an engaging portion engageable with a screw tool. A screw thread that is formed integrally with the shaft portion and that protrudes vertically from the seat surface of the head portion and that has a shaft portion that has a diameter smaller than the inner diameter of the hole portion of the member to be fastened. And the screw thread has an inclined surface that inclines from the outer peripheral side to the inner peripheral side along the driving direction, and when the rear surface of the inclined surface is driven, the tip end on the outer peripheral side of the inclined surface is opposite to the driving direction. Has a wall surface that can be freely deformed, the tip of the inclined surface on the outer peripheral side has a diameter larger than the inner diameter of the hole of the member to be fastened, bends toward the inner peripheral side at the time of driving, and the outer peripheral side at the completion of driving. It bulges out and is meshed with the inner wall of the hole of the member to be fastened. Drive bolt to be. 3. The driving bolt is provided with a spring member for urging the driving bolt in the pulling-out direction between the seat surface of the head portion and the shaft portion after the driving is completed. Alternatively, the driving bolt according to claim 2.