JPH0522823U - Bolt fixing structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bolt fixing structure capable of securely embedding and fixing a bolt in a member. In the bolt fixing structure for fixing the bolt 17 to the fixed member 1 by integrally molding the head 19 of the bolt 17 into the embedded portion 23 of the fixed member 1, the bolt 17
It is characterized in that a concave portion 22 is formed in the head portion 19 from the outer peripheral surface toward the inside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing structure for bolts embedded in a fixed member protruding from a vehicle body panel or the like for fixing a fixing member such as a relay block or a fuse box.

[0002]

[Prior Art]

 4 to 6 show a bolt 3 embedded in a fixed member 1 protruding from a vehicle body panel or the like by a conventional bolt fixing structure. In FIG. 5, the bolt 3 is composed of a head portion 5 and a screw portion 7. The head portion 5 has a rectangular first flange portion 9 and a second flange portion 11 smaller than the first flange portion 9. Are formed.

When the head portion 5 of the bolt 3 is embedded in the fixed member 1, the first flange portion 9 and the second flange portion 11 are embedded in the embedded portion 12 of the fixed member 1 as shown in FIG. 5B. R. When fixing the flange portion 13 projecting from a fixing member such as a relay block or fuse box to the fixed member 1 in which the bolt 3 is embedded in this manner, the flange portion 13 is formed as shown in FIG. The threaded portion 7 of the bolt 3 is inserted into the formed through hole 13a, the second flange portion 11 is brought into contact with the peripheral edge of the through hole 13a of the flange portion 13, and the nut 15 is screwed into the threaded portion 7 and tightened.

[0004]

[Problems to be solved by the device]

 However, when an excessive torque is applied to the nut 15 when tightening the nut 15, the first flange portion 9 rotates in the fixed member 1 as shown in FIG. Can not be fixed to.

That is, the corner portion 9a of the rectangular first flange portion 9 breaks the fixed member 1, and the bolt 3 idles. For this reason, the torque is controlled so that excessive torque is not applied, and the nut is not tightened too much, so the range of torque management was narrow.

Therefore, an object of the present invention is to provide a bolt fixing structure capable of securely embedding and fixing a bolt in a member to be fixed.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is characterized in that a recess is formed in the head of the bolt from the outer peripheral surface toward the inside.

[0008]

[Action]

 According to the present invention, since the concave portion is formed from the outer peripheral surface of the bolt toward the inner side, when the embedded portion of the fixed member and the bolt are integrally molded, the fixed member is fixed in the concave portion. Is inserted. When the member to be fixed is inserted into the recessed portion, the volume of the portion that resists the bolt when the bolt tries to idle with respect to the embedded portion of the member to be fixed increases, so the reaction force becomes larger than in the past. Therefore, the idling torque of the embedded portion of the bolt can be improved, and the bolt can be reliably embedded in the fixed member.

[0009]

【Example】

 Next, an embodiment of the bolt fixing structure according to the present invention will be described. 4 to 6, the same components as those of the bolt fixing structure shown in FIGS.

As shown in FIG. 1, the head portion 19 of the bolt 17 of this embodiment has a third flange portion 21 formed under the first flange portion 9. As shown in FIG. 1C, the third flange portion 21 has a recess 22 formed between the adjacent corner portions 19a inward from the outer peripheral surface of the third flange portion 21. The head portion 19 of the bolt 17 is integrally formed with the embedded portion 23 of the fixed member 1. As a result, the fixed member 1 flows into the recess 22 during the integral molding and is molded in this state.

When the bolt 17 is inserted into the through hole 13a of the flange portion 13 and the nut 15 is screwed and tightened, as shown in FIG. 3, the third flange portion 21 rotates in the direction of rotation (direction of arrow a in the figure). Power is given. In this case, since the fixed member 1 is inserted into the concave portion 22 of the third flange portion 21 of the head portion 19 of the present embodiment, when the bolt 17 tries to idle with respect to the embedded portion 23, the bolt 17 resists the bolt 17. Since the volume of the part to be retreated (meshed part in FIG. 3) is larger than that of the conventional repulsive part (meshed part in FIG. 4), the repulsive force becomes large. As a result, the idling torque of the bolt 17 with respect to the embedded portion 23 can be increased. Therefore, the bolt can be securely embedded and fixed in the member.

Further, in the past, the range of torque management was narrow so as not to apply an excessive torque, but according to the present embodiment, the tightening torque of the bolt 17 can be increased, so the range of torque management is increased. It can be set widely.

In the above embodiment, an example in which the third flange portion 21 is provided below the first flange portion 9 and the third flange portion 11 has been shown, but only the third flange portion 21 is provided on the head portion 19. You can turn it off.

[0014]

[Effect of the device]

 As described above, the bolt fixing structure according to the present invention has an excellent effect that the bolt can be securely embedded and fixed in the member.

[Brief description of drawings]

FIG. 1 is a plan view, a front view and a bottom view showing a bolt to which a bolt fixing structure according to the present invention is applied.

FIG. 2 is a cross-sectional view showing a state in which the bolt of this embodiment is embedded in a member.

3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 shows a flange portion of a conventional bolt, IV-IV in FIG.
It is sectional drawing cut | disconnected along the line.

FIG. 5 is a plan view and a front view showing a bolt to which a conventional bolt fixing structure is applied.

FIG. 6 is a cross-sectional view showing a state in which a conventional bolt is embedded in a fixed member and fixed to a panel.

[Explanation of symbols]

 1 Fixed Member 17 Bolt 19 Head 19a Corner 21 Third Flange 22 Recess 23 Embedded

Claims (1)

[Scope of utility model registration request] 1. A bolt fixing structure for fixing a bolt to a fixed member by integrally molding the head of the bolt to an embedded portion of the fixed member, wherein the head of the bolt is directed inward from the outer peripheral surface. A bolt fixing structure characterized in that a recess is formed.