JP2001171550A - Structure for attaching connecting bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cost and a weight from increasing in accompaniment to increase of the number of part items, while securing breakdown rigidity of a main shaft of a connecting bolt, in this attaching structure having the connecting bolt for attaching to a body member a member engaged with the bolt. SOLUTION: A collar 3 is provided in a periphery of the main shaft 2, the bolt shaft 2 is prevented from being inclined by bringing the collar 3 into contact with an upper face of a bottom of a cross-member 10 of recessed cross-sectional shape having a vertical wall 10b, the bolt 1 is provided to attach to the member 10 an insulator 20 engaged with the bolt shaft 2, and the collar 2 of the bolt 1 is welded to the upper face 10a of the bottom of the cross- member. When a position of the vertical wall 10b is conformed with an outside diameter end edge 21e of the insulator 20 engaged with the bolt shaft 2, strength is secured with respect to a direction of an axial line O along the vertical wall 10b to restrain a phenomenon that the vertical wall 10b is deformed in accompaniment to the inclination of the bolt 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a collar provided around a main shaft of a connecting bolt, which contacts a bottom surface of a vehicle body member having a concave cross section having a vertical wall to prevent inclination of the main shaft. The present invention relates to a mounting structure for mounting a mating member to the vehicle body member.

[0002]

2. Description of the Related Art A conventional connecting bolt mounting structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-212677 shown in FIG. This has a connecting bolt provided with a collar 3 around the main shaft 2, and this connecting bolt is connected to the vertical wall 11.
The bottom upper surface 11 of the vehicle body member 11 having a concave cross section
a, the collar 3 comes into contact with the plate member 40 to prevent the bolt main shaft 2 from tilting, and a member (insulator 25) that engages with the bolt main shaft 2 is engaged. Body member 11
It is attached to.

[0003] However, the plate member 40 has a rigidity of a fastening surface with the collar 3 and a main shaft (hereinafter referred to as a bolt shaft) 2.
A predetermined thickness d for maintaining the bolt shaft 2 by serration fitting as shown by the symbol S while securing the falling rigidity of the bolt shaft 2.
Is required, which causes disadvantages in cost and weight.

As another mounting structure, for example, there is one described in Japanese Patent Laid-Open No. 6-171547 shown in FIG. This is one in which one bolt shaft 2 is splitably connected to two shaft members 2a and 2b, and an insulator 26 that engages with the bolt shaft 2 is attached to the vehicle body member 12.

However, when the bolt shaft 2 is divided, since the collar 3 is directly disposed on the bottom upper surface 12a of the vehicle body member 12, the fastening surface rigidity between the vehicle body member 12 and the collar 3 and the falling rigidity of the bolt shaft 2 are high. Not something. Also,
When the shaft members 2a and 2b are joined by screws, the workability is poor because the screw surface cannot be seen, and the two shaft members 2a and 2b
There is a concern about galling when the is mounted diagonally. In addition, since the outer diameters of the shaft members 2a and 2b are increased by forming the screw holes, inconvenience occurs in cost and weight as in the above-described related art. In addition, it is necessary to remove the tap powder from the screw portion during processing, which causes inconvenience in workability.

[0006]

SUMMARY OF THE INVENTION The problem to be solved by the present invention has been made in view of the above-mentioned facts, and the cost and cost associated with an increase in the number of parts are secured while ensuring the falling rigidity of the main shaft of the connecting bolt. The purpose is to prevent an increase in weight.

[0007]

For this purpose, a connecting bolt mounting structure according to the first invention is provided with a collar around a main shaft, and the collar is provided on a bottom upper surface of a vehicle body member having a concave cross section having a vertical wall. A contact bolt for preventing inclination of the main shaft by contact and attaching a member engaging with the main shaft to the vehicle body member, wherein a collar of the connection bolt is welded to a top surface of a bottom portion of the vehicle body member. Things.

According to a second aspect of the present invention, in the first aspect, the position of the vertical wall of the vehicle body member coincides with the outer diameter edge of the member engaged with the main shaft of the connection bolt. It is characterized by being offset inward in the direction.

In a third aspect of the present invention, in the first or second aspect, a reinforcing member is provided on the vehicle body member, and one end of the reinforcing member is mounted on a vertical wall of the vehicle body member. Further, the other end is attached to the bottom upper surface in which the position of the vertical wall of the vehicle body member coincides with or is radially inwardly offset with respect to the outer diameter edge of the member engaged with the main shaft. It is assumed that.

According to a fourth aspect of the present invention, there is provided a connecting bolt mounting structure according to any one of the first to third aspects, wherein the member engaged with the main shaft is an inner cylinder of an insulator. .

According to a fifth aspect of the present invention, there is provided a connecting bolt mounting structure according to any one of the first to fourth aspects, wherein the connecting bolt is made of manganese boron steel. .

[0012]

According to the first aspect of the present invention, a connecting bolt mounting structure is provided with a collar around a main axis of the connecting bolt, and the collar is brought into contact with a bottom upper surface of a vehicle body member having a concave cross section having a vertical wall. The collar of the connecting bolt is welded to the upper surface of the bottom of the body member. Thus, the member engaged with the main shaft of the connection bolt is attached to the vehicle body member while preventing the inclination of the main shaft of the connection bolt.

In this case, in order to attach the connecting bolt to the vehicle body member, it is not necessary to provide a plate member or the like between the collar provided on the connecting bolt and the upper surface of the bottom of the vehicle member, or to divide the connecting bolt into two parts. .

Therefore, according to the first aspect of the present invention, it is possible to prevent an increase in cost and weight associated with an increase in the number of parts while securing the falling rigidity of the main shaft of the connecting bolt without increasing the number of parts. .

When the position of the vertical wall of the vehicle body member is offset radially outward relative to the outer diameter of the member engaged with the main shaft of the connecting bolt, the offset portion is in the same state as the free end. As a result, the rigidity of the connecting bolt is reduced to prevent deflection of the main shaft. For this reason, when a large torsion occurs in the connecting bolt main shaft, it is necessary to consider that a force is applied in the direction along the vehicle body member vertical wall due to the torsion, and the vehicle body member vertical wall is deformed. Therefore, the second invention, in which the following measures are taken for the first invention, is taken.
An invention or a third invention is proposed.

According to a second aspect of the present invention, in the first aspect, the position of the vertical wall of the vehicle body member coincides with the outer diameter edge of the member engaged with the main shaft of the connecting bolt. It is preferable to offset radially inward.

In this case, since the vertical wall of the vehicle body member is held by a member that engages with the main shaft of the connection bolt, the rigidity of the fastening surface between the collar provided on the connection bolt and the vehicle body member is improved. Therefore, according to the second aspect, the strength of the vehicle body member in the direction along the vertical wall is secured, and the phenomenon that the vertical wall of the vehicle body member is deformed due to the inclination of the connection bolt can be suppressed.

In a third aspect of the present invention, in the first or second aspect, the vehicle body member is provided with a reinforcing member, and one end of the reinforcing member is attached to a vertical wall of the vehicle body member. The other end is attached to the bottom upper surface where the position of the vertical wall of the vehicle body member matches or is radially inwardly offset with respect to the outer diameter edge of the member engaging with the main shaft of the connection bolt. Preferably.

In this case, the vertical wall of the vehicle body member is held by a member engaging with the main shaft of the connection bolt via a reinforcing member, so that the fastening between the collar provided on the connection bolt and the vehicle body member is performed. Surface rigidity is improved. Therefore, according to the third aspect, the strength of the vehicle body member in the direction along the vertical wall is secured, and the phenomenon that the vertical wall of the vehicle body member is deformed due to the inclination of the connection bolt can be suppressed.

According to the fourth aspect of the present invention, there is provided a connecting bolt mounting structure according to any one of the first to third aspects of the present invention.
Since the member engaged with the main shaft of the connection bolt is an inner cylinder of an insulator in which the main shaft of the connection bolt is easily tilted in order to reduce shock and vibration, the effects of the first to third inventions can be effectively achieved. Obtainable.

According to a fifth aspect of the present invention, there is provided a connecting bolt mounting structure according to any one of the first to fourth aspects of the present invention.
Since the connection bolt is made of manganese boron steel, it is possible to easily weld the collar portion to another member while securing the strength of the collar portion of the bolt member.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a suspension member 30 attached to a vehicle body, and an insulator 20 for reducing shock and vibration is attached to an attachment hole H. FIG. 2 shows one embodiment of a connecting bolt mounting structure according to the present invention.
It is sectional drawing shown from the A direction.

In the present embodiment, a suspension member 30 is attached via an insulator 20 to a cross member 10 which is a body member having a concave cross section.

As shown in FIG. 2, the cross member 10 has a concave cross section having a vertical wall 10b, and has a hole through which a connecting bolt 1 described later can be inserted. The connecting bolt 1 is provided with a collar 3 around a main shaft 2 of the connecting bolt 1, and an inner cylinder 21 of an insulator 20 is engaged with the main shaft (hereinafter referred to as a bolt shaft) 2. The insulator 20 includes the inner cylinder 2
An elastic body 23 is interposed between the outer cylinder 22 and the outer cylinder 22, and the outer cylinder 22 has a hole H formed in the suspension member 30.
Attached to.

In this embodiment, the bolt shaft 2 of the connecting bolt 1 is used.
The collar 3 provided around the bottom surface 1 of the cross member 10
0a, and contacts the bottom upper surface 10a of the cross member 10.
Then, the collar 3 of the connecting bolt 1 is welded as shown by the reference symbol W. Thus, the insulator 20 engaged with the bolt shaft 2 of the connecting bolt 1 is attached to the cross member 30 while preventing the bolt shaft 2 of the connecting bolt 1 from tilting.

In this case, the connecting bolt 1 is connected to the cross member 1
7 and 8, the collar 3 provided on the connecting bolt 1 and the bottom upper surface 1 of the cross member 10 are attached.
There is no need to provide a plate member 40 or the like between the shaft members 0a and 0a or to divide the connecting bolt into two shaft members 2a and 2b.

Therefore, according to the present embodiment, without increasing the number of parts, the falling rigidity of the connecting bolt 1 on the bolt shaft 2 is ensured, and increases in cost and weight due to the increase in the number of parts are prevented. be able to.

In the first embodiment, the plate member 40 is omitted. In this case, it is necessary to consider the following problems.

FIG. 3 shows, as a modification of the first embodiment, a structure in which the position of the cross member vertical wall 10b is offset radially outward with respect to the outer diameter edge 21e of the insulator inner cylinder 21. FIG. 4 is a cross-sectional view, and FIG. 4 is a cross-sectional view showing an operation when a twist T occurs around the main shaft 2 in FIG.

When the position of the cross member vertical wall 10b is offset radially outward by ΔCout as shown in FIG. 3, the offset portion is in the same state as the free end, so that the bolt shaft 2 is prevented from twisting. The torsional rigidity is reduced. For this reason, when a large twist T as shown in FIG. 4 is generated around the connecting bolt main shaft 2, a force is applied in the direction along the cross member vertical wall 10 by the twist T, for example,
It is necessary to consider so that the deformation as shown by the area X does not occur.

Therefore, second and third embodiments in which the following measures are taken with respect to the first embodiment are proposed.
FIG. 5 shows a second embodiment of the present invention. In this embodiment, the position of the vertical wall 10b of the cross member is smaller than the position indicated by the broken line in the outer diameter edge 21e of the insulator inner cylinder 21.
Is almost the same as

In this case, since the cross member vertical wall 10b is held by the end surface 21a of the insulator inner cylinder 21,
The fastening surface rigidity between the collar 3 provided on the connection bolt 1 and the bottom upper surface 10a of the cross member 10 is improved. Therefore,
According to the present embodiment, the strength in the direction (bolt axis O) along the cross member vertical wall 10b is secured, and the phenomenon that the cross member vertical wall 10b is deformed due to the inclination of the connection bolt 1 can be suppressed.

In this embodiment, the position of the vertical wall 10b of the cross member is the outer diameter edge 2 of the insulator inner cylinder 21.
1e, but the same effect is obtained even when the position of the vertical wall 10 of the cross member is offset radially inward with respect to the outer diameter edge 21e of the insulator inner cylinder 21. Is obtained.

FIG. 6 shows a third embodiment of the present invention.
This is another example of the second embodiment. In this embodiment, the reinforcing member 5 is provided on the cross member vertical wall 10b, one end 5a of the reinforcing member 5 is attached to the cross member vertical wall 10b, and the other end 5b engages with the connecting bolt main shaft 2. The position of the cross member vertical wall 10b is shifted radially inward by Δ with respect to the outer diameter edge 21e of the insulator inner cylinder 21.
It is attached to the bottom upper surface 10a offset by Cin.

In this case, the cross member vertical wall 10 b is connected to the end face 21 of the insulator inner cylinder 21 via the reinforcing member 5.
Therefore, the rigidity of the fastening surface between the collar 3 provided on the connection bolt 1 and the bottom upper surface 10a of the cross member 10 is improved. Therefore, according to the present embodiment, the strength in the direction (the bolt axis O) along the cross member vertical wall 10b is secured, and the phenomenon that the cross member vertical wall 10b is deformed due to the inclination of the connection bolt 1 is suppressed. it can.

In this embodiment, the position of the vertical wall 10b of the cross member is the outer diameter edge 2 of the insulator inner cylinder 21.
1e is offset radially inward, but the same effect is obtained even when the position of the vertical wall 10b of the cross member coincides with the outer diameter edge 21e of the insulator inner cylinder 21. Is obtained.

In the third embodiment, since the plate member is replaced by the reinforcing member 5, the total number of parts does not increase or decrease as compared with the conventional one, but the reinforcing member 5 is formed into a rod shape which is easy to process and has a relatively light weight. Then, similarly to the first embodiment, it is possible to prevent an increase in cost and weight due to an increase in the number of parts.

By the way, in the first to third embodiments,
Since the member that engages with the bolt shaft 2 is the inner cylinder 21e of the insulator 21 in which the bolt shaft 2 is easily tilted in order to reduce shock and vibration, the effects of the first to third embodiments can be effectively obtained. Can be.

The connecting bolt 1 is preferably made of manganese boron steel. In this case, it is possible to easily weld the collar 3 and other members while securing the strength of the collar 3 provided around the bolt shaft 2.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a suspension member attached to a vehicle body.

FIG. 2 is a cross-sectional view of the first embodiment of the connecting bolt mounting structure according to the present invention, as viewed from the direction of arrows AA in FIG. 1;

FIG. 3 is a cross-sectional view for explaining twisting rigidity related to a position between a cross member vertical wall and an outer diameter edge of an insulator inner cylinder.

FIG. 4 is a cross-sectional view for explaining deformation of a bottom portion of the cross member due to a force applied to a vertical wall of the cross member.

FIG. 5 is a cross-sectional view showing a state where the position of the cross member vertical wall is made to coincide with the outer diameter edge of the insulator inner cylinder in the second embodiment.

FIG. 6 is a cross-sectional view showing a third embodiment, in which a cross member vertical wall is attached to an offset position on a bottom upper surface of a cross member via a reinforcing member.

FIG. 7 is a cross-sectional view showing a conventional connection bolt mounting structure.

FIG. 8 is a cross-sectional view showing another conventional connection bolt mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connecting bolt 2 Bolt shaft (main shaft) 3 Collar 5 Reinforcement member 10 Cross member (vehicle member) 10a Cross member bottom upper surface 10b Cross member vertical wall 20 Insulator (member engaging with main shaft) 21 Insulator inner cylinder 22 Insulator outer cylinder 23 Insulator elastic body 30 Suspension member

Claims (5)

[Claims] A collar is provided around a main shaft, and the collar contacts a top surface of a bottom portion of a vehicle body member having a concave cross section having a vertical wall to prevent inclination of the main shaft, and a member engaging with the main shaft is provided. A connecting bolt for mounting to a vehicle body member, wherein a collar of the connecting bolt is welded to an upper surface of a bottom portion of the vehicle body member. 2. The vehicle body member according to claim 1, wherein a position of a vertical wall of the vehicle body member is aligned with or offset radially inward from an outer diameter edge of a member engaging with a main shaft of the connection bolt. A mounting structure for connecting bolts according to claim 1. 3. A reinforcing member is provided on the vehicle body member, one end of the reinforcing member is attached to a vertical wall of the vehicle body member, and the other end is provided on an outer diameter edge of a member engaged with the main shaft. 3. The connecting bolt mounting structure according to claim 1, wherein the vertical wall of the vehicle body member is mounted on a bottom upper surface in which the positions of the vertical walls coincide or are offset inward in the radial direction. 4. The connecting bolt mounting structure according to claim 1, wherein the member that engages with the main shaft is an inner cylinder of an insulator. 5. The connection bolt mounting structure according to claim 1, wherein the connection bolt is made of manganese boron steel.