JP2004286057A - Structure for bolt fastening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for bolt fastening, which structure can surely lock and position the bolt while preventing embrittlement of the bolt by omitting welding of the bolt to a setting plate, and can minimize machining work for a member to be fastened and can reduce a cost. <P>SOLUTION: A locking portion 5c is protrusively provided on a required position in the peripheral direction of a flange portion 5b integrally formed with a head portion 5a of the bolt 5. In addition, a locking groove portion 9, into which the rotation stopper portion 5c can be fitted, is formed at an edge portion of a bolt hole of a rear axle housing 1 used as a member to be fastened. A plurality of bolts 5 are coupled with each other beforehand via a connecting plate 10 arranged over the bolts 5 such that the locking portion 5c is fitted into the locking groove portion 9 when the bolts 5 are inserted into a plurality of the bolt holes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bolt fastening structure in which a bolt is inserted into a plurality of bolt holes formed in a member to be fastened and a nut is fastened.
[0002]
[Prior art]
Generally, in vehicles such as trucks, various members are fastened using bolts and nuts.
[0003]
FIG. 6 shows an example in which an air suspension support beam is attached to a rear axle housing as a member to be fastened in the bolt fastening structure, where 1 is a rear axle housing, and 2 is an air suspension support beam. By inserting a bolt 5 into a bolt hole 3 drilled in the rear axle housing 1 and a bolt hole 4 drilled in the air suspension support beam 2 and tightening the nut 6, the rear axle housing 1, the air suspension support beam 2 Are integrated.
[0004]
When the rear axle housing 1 and the air suspension support beam 2 are fastened by the bolts 5 as described above, a large torque is required to tighten the nuts 6 with respect to the bolts 5. Become.
[0005]
Normally, when tightening the nut 6 with respect to the bolt 5, the head 5a of the bolt 5 should be pressed with a tool such as a socket wrench, but the bolt hole 3 of the rear axle housing 1 has extra space in space. In many cases, it is difficult to use the tool as described above because the tool is provided at a position where no tool is provided.
[0006]
Therefore, conventionally, for example, as shown in FIG. 7, a plurality of insertion holes 8 having the same diameter as the bolt holes 3 are formed in the setting plate 7 at intervals equal to the interval W between the bolt holes 3 (see the example in FIG. In this case, two bolts are inserted into the through holes 8 of the setting plate 7, and the outer periphery of the flange portion 5b formed under the head 5a is welded to the setting plate 7 in advance. It has been considered that the bolts 5 connected by the setting plate 7 are inserted into the bolt holes 3 and 4 to tighten the nuts 6.
[0007]
Although slightly different from the bolt fastening structure shown in FIGS. 6 and 7, two nuts are fixed to the setting plate in advance, and the bolts are tightened to the nuts, so that the member to be fastened is tightened. For example, Japanese Patent Application Laid-Open Publication No. HEI 10-163566 discloses an example in which bolts are used.
[0008]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-16351
[Problems to be solved by the invention]
By the way, high strength is required for the bolt 5 for fastening the rear axle housing 1 and the air suspension support beam 2, but when the bolt 5 is welded to the setting plate 7 as shown in FIG. 5 was likely to be embrittled, which was not very preferable.
[0010]
Further, when there is a projection between the bolt holes 3 of the rear axle housing 1, the setting plate 7 cannot be used. Therefore, the periphery of the bolt holes 3 needs to be flattened over a wide area over the entire surface. As a result, there is a problem that the trouble of processing is increased and the cost is increased.
[0011]
The present invention has been made in view of the above circumstances, and can prevent the embrittlement of the bolt without welding the bolt to the setting plate, and can surely perform the positioning and the rotation stop of the bolt. It is an object of the present invention to provide a bolt fastening structure that can minimize the cost and reduce the cost.
[0012]
[Means for Solving the Problems]
The present invention relates to a bolt fastening structure in which a bolt is inserted into a plurality of bolt holes formed in a member to be fastened and a nut is tightened.
A detent portion is projected from a required portion in a circumferential direction of a flange portion formed integrally with the head of the bolt, and a detent groove portion capable of fitting the detent portion to an edge of a bolt hole of a member to be fastened. Is formed, and the plurality of bolts are connected in advance via a connection plate that is bridged between the heads of the bolts so that the detent portions fit into the detent grooves when the bolts are inserted into the plurality of bolt holes. The present invention relates to a bolt fastening structure which is characterized in that:
[0013]
According to the above means, the following effects can be obtained.
[0014]
When a bolt connected in advance through a connection plate is inserted into the plurality of bolt holes of the member to be fastened, the detent grooves of the bolt flanges fit into the detent grooves formed at the edges of the bolt holes. Therefore, when the bolt is tightened in this state, if the nut is tightened, the detent is fitted into the detent groove, and the bolt turns. This makes it possible to securely tighten the nut with a large torque.
[0015]
As a result, even when a high strength is required for the bolt for fastening the member to be fastened, unlike the conventional case where the bolt is welded to the setting plate, there is no possibility that the bolt becomes brittle, Further, since it is sufficient to form only the edge of the bolt hole of the member to be fastened to form the detent groove, it is possible to cope with a case where there is a protrusion between the bolt holes of the member to be fastened. The periphery of the bolt hole does not have to be flattened over a wide area over the entire surface, which reduces the processing labor and costs.
[0016]
In the bolt fastening structure, a rivet projection protruded from the top surface of the bolt head is fitted with a coupling hole formed in the connection plate, and the rivet projection is crushed and tightened, so that the rivet projection is tightened. Preferably, the connecting plate is fixed.
[0017]
Further, in the bolt fastening structure, a plurality of fixing flange surfaces each having a coupling hole formed therein and fixed to the top surface of the bolt, connecting the fixing flange surfaces to each other, and rising from the top surface of the bolt head. The connecting plate can be constituted by the connecting portion extending as described above.
[0018]
Furthermore, in the bolt fastening structure, the member to be fastened may be a rear axle housing to which an air suspension support beam is attached.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
1 to 3 show an example of the embodiment of the present invention. In the drawings, portions denoted by the same reference numerals as those in FIGS. 6 and 7 represent the same components, and are integrated with the head 5a of the bolt 5. A detent part 5c is projected from a required portion in the circumferential direction of the flange part 5b formed at the same time, and the detent part is provided at an edge of the bolt hole 3 (see FIG. 6) of the rear axle housing 1 as a member to be fastened. 5c is formed so that the detent groove 9 can be fitted therein, and the detent groove 5c is fitted into the detent groove 9 when the bolt 5 is inserted into a plurality of (two in the example in the figure) bolt holes 3. The bolts (two bolts in the example in the drawing) are connected in advance via a connection plate 10 that is bridged between the bolts 5.
[0021]
In the case of the illustrated example, a coupling hole 10a formed in the connection plate 10 is fitted into a rivet protrusion 5d projecting from the top surface of the head 5a of the bolt 5, and the rivet protrusion 5d is crushed and tightened. The connecting plate 10 is fixed to the head 5a of the bolt 5. The rivet protrusion 5d may be squashed into a flat surface as shown in FIG. 4 or mortar as shown in FIG. It goes without saying that the surface may be crushed so as to form a surface.
[0022]
The connecting plate 10 has a plurality of fixing flange surfaces 10b having connection holes 10a formed therein and fixed to the top surface of the head 5a of the bolt 5, connecting the fixing flange surfaces 10b to each other, and And a connecting portion 10c extending from the top surface of the portion 5a.
[0023]
Next, the operation of the above illustrated example will be described.
[0024]
When the bolts 5 connected in advance through the connection plate 10 are inserted into the plurality of bolt holes 3 of the rear axle housing 1 as a member to be fastened, the bolts 5 are inserted into the detent grooves 9 formed at the edges of the bolt holes 3. Since the rotation preventing portion 5c of the flange portion 5b of the bolt 5 is fitted, the bolt 5 can be reliably positioned. In this state, if the nut 6 is tightened to the bolt 5, the rotation preventing portion Since 5c is fitted in the detent groove 9, the bolt 5 does not turn, and the nut 6 can be securely tightened with a large torque.
[0025]
As a result, even when high strength is required for the bolt 5 for fastening the rear axle housing 1 as the member to be fastened and the air suspension support beam 2, as shown in FIG. Unlike the case where the bolts 5 are welded, there is no possibility that the bolts 5 are embrittled, and only the edges of the bolt holes 3 of the rear axle housing 1 as the members to be fastened are formed to form the detent grooves 9. For this reason, it is possible to cope with a case where there is a protrusion between the bolt holes 3 of the rear axle housing 1, and the periphery of the bolt hole 3 does not have to be flattened over a wide area over the entire surface. In addition, the processing labor is reduced, and the cost is reduced.
[0026]
Thus, it is possible to reliably prevent the bolt 5 from rotating and to position the bolt 5 without welding the bolt 5 to the setting plate 7 without welding the bolt 5, and to process the rear axle housing 1 as a member to be fastened. Work can be minimized and cost can be reduced.
[0027]
It should be noted that the bolt fastening structure of the present invention is not limited to the illustrated example described above. If there are two or more bolt holes 3, the corresponding two or more bolts 5 are connected via the connection plate 10. It goes without saying that various changes can be made without departing from the gist of the present invention, such as the connection may be made in advance.
[0028]
【The invention's effect】
As described above, according to the bolt fastening structure of the present invention, the bolt can be reliably prevented from rotating and positioned while preventing embrittlement without welding the bolt to the setting plate. An excellent effect of minimizing the processing time of the fastening member and reducing the cost can be achieved.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of an embodiment of the present invention.
FIG. 2 is a plan view of an example of an embodiment of the present invention.
FIG. 3 is a side view of a bolt according to an example of the embodiment of the present invention.
FIG. 4 is an enlarged side view of a main part showing a modified example of how a rivet projection protruding from a top surface of a bolt head is crushed in an example of an embodiment of the present invention.
FIG. 5 is an enlarged side view of a main part showing another modified example of how a rivet protrusion protruding from a top surface of a bolt head is crushed in an example of an embodiment of the present invention.
FIG. 6 is a perspective view showing an example in which an air suspension support beam is attached to a rear axle housing as a member to be fastened in the bolt fastening structure.
FIG. 7 is a side view showing an example of a conventional structure in which bolts are connected as detents.
[Explanation of symbols]
1 rear axle housing (member to be fastened)
2 Air suspension support beam (member to be fastened)
3 Bolt Hole 4 Bolt Hole 5 Bolt 5a Head 5b Flange 5c Detent 5d Rivet Projection 6 Nut 9 Detent Groove 10 Connection Plate 10a Connection Hole 10b Fixed Flange Surface 10c Connection

Claims (4)

In a bolt fastening structure in which a bolt is inserted into a plurality of bolt holes formed in a member to be fastened and a nut is tightened,
A detent portion is provided at a required position in a circumferential direction of a flange portion formed integrally with the head of the bolt, and a detent groove portion in which the detent portion can be fitted to an edge of a bolt hole of a member to be fastened. Is formed, and the plurality of bolts are connected in advance via a connecting plate that is bridged between the heads of the bolts so that the detents fit into the detent grooves when the bolts are inserted into the plurality of bolt holes. A bolt fastening structure characterized in that: A connection hole formed in the connection plate is fitted into a rivet protrusion projecting from the top surface of the bolt, and the connection plate is fixed to the bolt head by crushing and tightening the rivet protrusion. The bolt fastening structure according to claim 1. A connecting plate comprising: a plurality of fixing flange surfaces having connection holes formed therein and fixed to the top surface of the bolt; and a connecting portion connecting the fixing flange surfaces to each other and extending so as to rise from the top surface of the bolt. The bolt fastening structure according to claim 2, wherein: The bolt fastening structure according to any one of claims 1 to 3, wherein the member to be fastened is a rear axle housing to which an air suspension support beam is attached.

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