JP2001304208A - Bolt, and mounting structure for instrument panel reinforcement using the bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt to reliably fasten two members having variations in spacing, while absorbing the spacing and to provide the mounting structure of instrument panel reinforcement using the bolt. SOLUTION: A collar bolt is mounted on a shaft part 3 of a bolt body 1, threadedly engaged with an internal thread 21 of a second member 20such that the bolt can be separated by a given load. A thread part 7 threadedly engaged with an internal thread 11 is formed at the upper part of the outer peripheral surface of the collar bolt 6. This bolt is stopped in a position where the lower end of the collar bolt 6 buts against a second member 20, by further rotating the bolt body 1, the bolt body 1 is separated away from the collar bolt 6 and fastened against the internal thread 21 of the second member 20. By using the bolt, the inner panel reinforcement is fastened directly against the body by the bolt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt which can fasten two members while absorbing variations in dimensional accuracy, and a mounting structure of an instrument panel reinforcement using the bolt.

[0002]

2. Description of the Related Art As shown in FIG. 10, for example, when bolting both ends of a long member called an instrument panel reinforcement 52 to an end face of a body 51 of an automobile, a press of the body 51 and the instrument panel reinforcement 52 is performed. Due to the variation in the assembly accuracy, the bolt assembly position varies between the body 51 and the instrument panel reinforcement 52. Therefore, conventionally, an adjustment member 53 having an L-shaped horizontal section is interposed on one side of the instrument panel reinforcement 52, and the relative position between the adjustment member 53 and the instrument panel reinforcement 52 is determined by using a long hole 54 of the adjustment member 53. The bolt was tightened to the body 51 while adjusting the position. However, when such an adjusting member 53 is used, there is a problem that the number of parts increases and the number of bolts to be fastened also as compared with a case where the instrument panel reinforcement 52 is directly bolted.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a bolt capable of securely tightening two members having a dimensional accuracy variation while absorbing the variation. The present invention has been made to provide a mounting structure for instrument panel reinforcements using bolts.

[0004]

A bolt according to the present invention, which has been made to solve the above-mentioned problem, comprises a cylindrical collar bolt having a threaded portion formed on an outer peripheral surface thereof and screwed to a first member.
It is characterized in that it is attached to a shaft portion of a bolt body screwed to the second member so as to be detached with a predetermined torque and has a position adjusting function. In addition, it is preferable to adopt a structure in which a color bolt is attached to a serration portion formed on a shaft portion of the bolt body via a resin portion, or a color bolt is attached to a middle flange formed on the shaft portion of the bolt body. It is preferable to form a spiral lead on the inner surface of the collar bolt so that the bolt body can be smoothly detached from the collar bolt and the collar bolt can be removed from the first member.

[0005] At the joint between the lead portion on the inner surface of the collar bolt and the resin portion or the middle flange portion on the bolt body side, a thread including a portion different in pitch or thread shape from other threads is formed. A predetermined frictional force can be obtained. In addition, it is preferable to form a threadless portion for transmitting high torque from the bolt body at the time of removing the collar bolt, at the upper end of the lead portion on the inner surface of the collar bolt.

[0006] Further, the mounting structure of the instrument panel reinforcement of the present invention, which has been made to solve the above-mentioned problem, comprises:
The above-mentioned bolt is used to directly bolt an instrument panel reinforcement or a modularized unit including an instrument panel reinforcement to a body.

As will be described below, the bolt of the present invention absorbs variations in the relative positions of the first member and the second member by using the color bolt simply by screwing the bolt body into the first member. The member and the second member can be securely fastened. For this reason, according to the mounting structure of the instrument panel reinforcement using the bolt of the present invention, the instrument panel reinforcement can be directly bolted to the body of the automobile without using a conventional adjusting member,
It is possible to improve the assembly workability and reduce the cost.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a bolt body having a flanged head portion 2, and a screw portion 4 is formed at the tip of a shaft portion 3. The screw portion 4 is formed on the second member 20 and is screwed to the screw portion 21. A serration portion 5 is formed at an intermediate position between the screw portion 4 and the head portion 2 of the shaft portion 3. As shown in FIG. 2, a middle flange 13 with a lead 12 may be provided instead of the serration 5.

Reference numeral 6 denotes a cylindrical collar bolt, which is formed on the first member 10 at the upper portion of the outer peripheral surface thereof, and is formed with a threaded portion 11.
Is formed. The collar bolt 6 is attached to the serration portion 5 of the bolt body 1 or to the middle flange portion 13 with the lead portion 12. The attachment can be transmitted up to a predetermined torque. The main body 1 can be detached from the serration portion 5 or the middle flange portion 13 with the lead portion 12. In the example of FIG. 1, a resin portion 8 is insert-molded between the center of the collar bolt 6 and the serration portion 5, and in the example of FIG. The portion 13 is joined by a predetermined frictional force, and when the torque exceeds a predetermined torque, the resin portion 8
Are detached from the serration section 5. However, the joining portion between the collar bolt 6 and the bolt body 1 does not necessarily need to be provided with the resin portion 8 or the middle flange portion 13. Can also be adopted.

The operation of the bolt according to the present invention will be described below with reference to FIGS. In these figures, the first member 10
Is a body, and the second member 20 is a member such as an instrument panel reinforcement. The female thread 11 of the first member 10 and the female thread 21 of the second member 20 are nuts, respectively. The distance s between the first member 10 and the second member 20 includes variations, and the relative positions of the central axis 22 of the female thread 11 and the central axis 23 of the female thread 21 vary.

First, as shown in FIG. 3, the collar bolt 6 of the bolt of the present invention is inserted into the female thread portion 11 of the first member 10 and the head 2 of the bolt main body 1 is rotated by a tool to rotate the collar bolt 6. The screw 7 is screwed into the female thread 11 of the first member 10. In this state, since the collar bolt 6 does not receive a large resistance, torque is transmitted from the bolt body 1 to the collar bolt 6, and the collar bolt 6 rotates together with the bolt body 1 as shown in FIG. Part 11
Going screwed.

In this manner, when the collar bolt 6 advances inside the female thread portion 11 of the first member 10 and the lower end thereof contacts the upper surface of the second member 20 as shown in FIG.
Stops at that position because it cannot proceed any further. The stop position of the collar bolt 6 changes according to the distance s between the first member 10 and the second member 20. When the bolt body 1 is further rotated from this state, a large torque acts between the collar bolt 6 and the bolt body 1.
The resin portion 8 is separated from the lead portion 12 of the collar bolt 6 and advances to a position where only the bolt body 1 contacts the second member 20 as shown in FIG.

Then, the bolt body 1 is further rotated from this state, and the screw portion 4 of the bolt body 1 is screwed to the screw portion 21 because it is formed on the second member 20. At that time, the female thread 1
Although the relative position between the central shaft 22 of the first screw shaft 1 and the central shaft 23 of the female screw portion 21 may be shifted, due to the play provided between the outer diameter of the resin portion 8 and the inner diameter of the collar bolt 6 as shown in FIG. The center axis 23 of the screw portion 21 and the center axis of the bolt body 1 can be matched. As a result, as shown in FIG. 6, the bolt main body 1 is tightened to a position where the head 2 presses the first member 10, and the fastening of the first member 10 and the second member 20 is completed. At this time, the first member 10 and the second member 2
The distance s from zero is kept constant by the collar bolt 6, and the fastening by the bolt body 1 can be performed reliably.

As described above, when the bolt of the present invention is used, the first member 10 and the second member 20 are fastened by the bolt body 1 with the collar bolt 6 interposed therebetween. 6 changes the stop position in accordance with the distance s between the first member 10 and the second member 20, absorbs the variation in the distance s, and removes the bolt body 1 from the collar bolt 6 and the bolt body 1 The gap between the central axis 22 of the female thread 11 and the central axis 23 of the female thread 21 is absorbed by the play therebetween. For this reason, even if the distance s and the relative position between the center shafts 22 and 23 vary, the first member 10 and the second member 20 can be securely bolted.

As described above, the bolt according to the present invention has the first member 1
Since it has a function of absorbing a variation in the relative position between the 0 and the second member 20, the instrument panel reinforcement or the modularized unit 30 including the instrument panel reinforcement is bolted to the body 51 as shown in FIG. If used in such a case, it is possible to directly bolt the two together without using another adjusting member as in the related art.

If the spiral lead 12 is formed on the inner surface of the collar bolt 6, the bolt body 1 can be smoothly detached from the collar bolt 6, and the lead 12 can be fitted again. The combination is further preferable because the collar bolt 6 can be removed from the first member 10.

FIG. 8 shows another embodiment of the present invention, in which a connecting portion between a lead portion 12 on the inner surface of a collar bolt 6 and a resin portion 8 or a middle flange portion 13 on the bolt body 1 side has another portion. The thread is formed by forming a thread including portions having different pitches or thread shapes.

That is, FIG. 8B is an enlarged sectional view of a portion surrounded by a circle in FIG. 8A, and a part of the thread of the middle flange portion 13 is formed in a thread shape with other threads. There are different things. As shown in the figure, by increasing the thread angle or crushing the tip of the thread to form a trapezoid, the thread is formed on the lead portion 12 on the inner surface of the collar bolt 6 and is forcibly engaged with the thread portion and the hatched portion. It becomes the structure which transmits torque.

As shown in FIG. 8C, a part of the thread may include a part having a different pitch from other threads. If such an irregular pitch portion is formed, a structure is formed in which the thread is forcibly engaged with the thread of the other party and a predetermined torque is transmitted. In addition, even if a screw thread having a different screw thread shape or pitch is formed on the side of the collar bolt 6, the resin portion 8
Alternatively, it may be formed on the middle flange portion 13 side.

In the structure shown in FIG. 8, a predetermined torque is transmitted from the bolt body 1 to the collar bolt 6, and the bolt body 1 is further rotated in a state where the collar bolt 6 is in contact with the second member 20. Accordingly, when a load exceeding the predetermined torque acts on the meshing portion, the coupling between the two can be released.

As described above, the coupling between the bolt body 1 and the collar bolt 6 may be released with a predetermined torque at the time of fastening.
Similarly, when separating the first member 10 from the first member 10, it is desirable that the torque be transmitted from the bolt body 1 to the collar bolt 6 reliably. To ensure this torque transmission, a threadless portion 14 can be formed at the upper end of the lead portion 12 on the inner surface of the collar bolt 6 as shown in FIG.

Since the inner diameter d of the threadless portion 14 is formed in the lead portion 12, it is smaller than the root diameter D of the screw. As a result, when the bolt body 1 is reversed when the collar bolt 6 is removed and the resin portion 8 or the middle flange portion 13 hits the threadless portion 14, the bolt body 1 cannot proceed any further and the color bolt 6 High torque can be transmitted. When the torque reaches a value sufficient to release the screwing between the collar bolt 6 and the first member 10, the collar bolt 6 is removed together with the bolt body 1.

[0023]

As described above, since the bolt of the present invention is provided with the collar bolt capable of absorbing the variation in the relative position between the first member and the second member, the bolt body is simply screwed in. Only by this, the first member and the second member can be securely fastened and detached. Further, according to the mounting structure of the instrument panel reinforcement of the present invention, the instrument panel reinforcement can be directly bolted to the body without using an adjusting member, thereby improving assembling workability and reducing costs. There are advantages that can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a bolt of the present invention.

FIG. 2 is a sectional view showing another embodiment of the bolt of the present invention.

FIG. 3 is a cross-sectional view showing a state where a collar bolt is inserted into a first member.

FIG. 4 is a cross-sectional view illustrating a state in which a lower end of a collar bolt has contacted a second member.

FIG. 5 is a cross-sectional view showing a state where a bolt body is separated from a collar bolt.

FIG. 6 is a cross-sectional view showing a state where the bolt body is screwed into a second member.

FIG. 7 is a perspective view showing a mounting structure of the instrument panel reinforcement of the present invention.

FIG. 8 is a cross-sectional view showing another embodiment of the present invention;
(A) is an overall sectional view, (B) is an enlarged sectional view when a part of the thread shape is changed, and (C) is an enlarged sectional view when a part of the thread pitch is changed.

FIG. 9 is a sectional view showing still another embodiment of the present invention.

FIG. 10 is a perspective view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bolt main body 2 Head 3 Shaft part 4 Screw part 5 Serration part 6 Color bolt 7 Screw part 8 Resin part 10 First member 11 Female thread part 12 Lead part 13 Middle flange part 14 No screw part 20 Second member 21 Female thread 22 Central axis of female thread 11 23 Central axis of female thread 21 30 Modularized unit including instrument panel reinforcement 51 Body 52 Instrument panel reinforcement 53 Adjusting member 54 Slot

Continued on the front page (72) Inventor Shuji Ito 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture Inside the Oguchi Plant of Aoyama Seisakusho Co., Ltd. (72) Inventor Ryuji Utsuno 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture (72) Inventor Masato Yabuoshi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation

Claims (7)

[Claims] 1. A cylindrical collar bolt having a threaded portion screwed to a first member on an outer peripheral surface is detached from a shaft portion of a bolt body screwed to a second member by a predetermined load. A bolt with a position adjustment function. 2. The bolt according to claim 1, wherein the collar bolt is attached to a serration formed on a shaft of the bolt body via a resin part. 3. The bolt according to claim 1, wherein the collar bolt is attached to a middle flange formed on a shaft of the bolt body. 4. A spiral lead portion is formed on the inner surface of the collar bolt so that the bolt body can be smoothly removed from the collar bolt and the collar bolt can be removed from the first member. 3. The bolt according to any one of 3. 5. A thread including a portion having a different pitch or thread shape from other threads is formed at a joint between the lead portion on the inner surface of the collar bolt and the resin portion or the middle flange portion on the bolt body side. The bolt according to claim 4. 6. An upper end of a lead portion on an inner surface of a color bolt,
The bolt according to claim 4 or 5, wherein a screwless portion for transmitting high torque from the bolt body when removing the collar bolt is formed. 7. A bolt unit according to claim 1, wherein the instrument panel reinforcement or the modularized unit including the instrument panel reinforcement is directly bolted to the body. Mounting structure for instrument panel reinforcement.