JP6791738B2 - Bolt planting structure and upper support using it, manufacturing method of bolt planting structure - Google Patents

Description

The present invention relates to a bolt planting structure in which a planting bolt is fitted and fixed in a bolt planting hole of a fitting plate member, an upper support having a bolt planting structure, and a method for manufacturing a bolt planting structure.

Conventionally, as a means for planting bolts in plate metal fittings, a bolt planting structure has been used in which a bolt is inserted into a bolt hole formed in the plate metal fitting and the base end of a bolt shaft is fitted and fixed in the bolt hole. Are known. Such a bolt planting structure is applied to, for example, an upper support of a suspension mechanism as in Japanese Patent Application Laid-Open No. 2010-14133 (Patent Document 1). In Patent Document 1, a plate metal fitting constituting an outer metal fitting is used. A structure is disclosed in which bolt holes are formed in the upper metal fittings and the lower metal fittings, and fastening bolts are planted in the bolt holes.

By the way, when the fastening bolt is planted in the plate metal fitting in the inserted state as in Patent Document 1, it is necessary to secure a sufficient pull-out drag force of the fastening bolt. In particular, when it is difficult to secure a sufficient pull-out drag force only by fitting the fastening bolt to the inner peripheral surface of the bolt hole, such as when the plate metal fitting for fixing the fastening bolt is thin, FIG. 8 of Patent Document 1 shows. As shown, by crushing the serrations of the fastening bolt protruding from the bolt hole in the axial direction with a mold to increase the diameter, the plate fitting can be placed between the enlarged diameter portion of the shaft portion of the fastening bolt and the head. It has also been proposed to pinch and secure the pull-out resistance of the fastening bolt.

However, as in Patent Document 1, in order to secure the pull-out drag force of the fastening bolt by crushing the serrations, it is necessary to plastically deform the fastening bolt, so that the degree of freedom in selecting the material and structure for forming the fastening bolt is limited. There was a risk that it would be done.

Japanese Unexamined Patent Publication No. 2010-14133

The present invention has been made in the background of the above circumstances, and the problem to be solved is to make it possible to select the material and structure for forming the planting bolt with a large degree of freedom, and to the fitting plate member of the planting bolt. It is an object of the present invention to provide a bolt planting structure having a novel structure capable of obtaining a large fixing strength.

It is also an object of the present invention to provide an upper support provided with the above-mentioned novel bolt-planting structure and a method for manufacturing the bolt-planting structure for realizing the above-mentioned new bolt-planting structure.

Hereinafter, aspects of the present invention made to solve such problems will be described. The components adopted in each of the following aspects can be adopted in any combination as much as possible.

That is, in the first aspect of the present invention, a bolt planting hole is formed through the fitting plate member, the planting bolt is inserted through the bolt planting hole, and the shaft portion of the planting bolt is the bolt. In the bolt planting structure that is fitted and fixed in the planting hole, the connecting plate member is overlapped and fixed on one surface of the fitting plate member, and the connecting plate member is fixed to the connecting plate member more than the bolt planting hole. inserted with a large diameter of the bolt insertion hole is formed through, the bolt planting設孔and the bolt insertion hole is aligned with one another and connected in series, the implanted bolts in the fitting plate member Around the bolt planting hole, there is a recessed portion in which the fitting plate member is pressed and deformed in the penetrating direction of the bolt planting hole on the surface opposite to the overlapping surface with the connecting plate member. The surface pressure acting on the outer peripheral surface of the shaft portion of the planting bolt and the inner surface of the bolt planting hole in the fitting plate member is increased by the formation of the recessed portion of the planting bolt. While the pull-out resistance is increased , the bolt insertion hole in the connecting plate member is made larger than the outer diameter of the inserted planting bolt, and the recessed portion formed in the fitting plate member. However, it is characterized in that it is located on the outer peripheral side of the bolt insertion hole in the connecting plate member .

According to the bolt planting structure having a structure according to the first aspect, the fitting plate member is formed by forming a recess in the fitting plate member around the bolt planting hole through which the planting bolt is inserted. It deforms so that it bulges toward the inner circumference of the bolt planting hole. As a result, the inner peripheral surface of the bolt planting hole in the fitting plate member is strongly pressed against the outer peripheral surface of the shaft portion of the planting bolt, so that the planting bolt does not need to be plastically worked and the dragging force of the planting bolt is removed. Can be increased. Therefore, it is possible to plant the planting bolt in the fitting plate member with sufficient fixing strength without limiting the forming material and structure of the planting bolt. Further, according to this aspect, for example, when a hole for inserting a planting bolt is formed in the fitting plate member and the connecting plate member before being overlapped with each other, the bolt insertion hole of the connecting plate member is formed in the fitting plate member. By making the diameter larger than that of the bolt planting hole, it is possible to allow an error in the dimensions and relative positions of the fitting plate member and the connecting plate member. Moreover, the structure is such that the planting bolt is fixed to the fitting plate member without being fixed to the connecting plate member, and even when it is difficult to obtain a large fitting area for the fitting plate member of the planting bolt, the recessed portion is formed. Sufficient pull-out resistance of the planting bolt can be secured.

In the second aspect of the present invention, in the bolt planting structure described in the first aspect, the recessed portion has a groove shape extending in the circumferential direction of the bolt planting hole.

According to the second aspect, since the recessed portion is provided so as to extend in the circumferential direction of the bolt planting hole around the bolt planting hole, the inner surface of the hole of the bolt planting hole and the shaft portion of the planting bolt are provided. Since the outer peripheral surface is pressed in a wider range in the circumferential direction by forming the recessed portion, it is possible to obtain a larger pull-out drag force of the planting bolt.

A third aspect of the present invention is the bolt planting structure described in the second aspect, wherein the recessed portion is an annular groove that continuously extends around the entire circumference of the bolt planting hole. It is a thing.

According to the third aspect, since the inner peripheral surface of the bolt planting hole and the outer peripheral surface of the shaft portion of the planting bolt are pressed over the entire circumference by forming the recessed portion, the planting is performed by forming the recessed portion. It is possible to more effectively increase the pull-out drag of the bolt. Moreover, when forming a recessed portion around the bolt planting hole through which the planting bolt is inserted, it is possible to prevent deformation of the fitting plate member in the surface direction due to the formation of the recessed portion in the circumferential direction of the recessed portion. It is efficiently generated on the inner peripheral side, and the pull-out drag force of the planting bolt can be set more effectively.

A fourth aspect of the present invention is the fitting portion of the planting bolt to the bolt planting hole in the shaft portion in the bolt planting structure described in any one of the first to third aspects. Is provided with serrations.

According to the fourth aspect, when a nut or the like is screwed to the planting bolt, the rotation of the planting bolt is prevented by serrations, so that the reaction force against the rotational force acting on the planting bolt is sufficiently sufficient. Obtainable. Further, since the fitting plate member deformed to the inner peripheral side of the bolt planting hole due to the formation of the recessed portion enters the recessed groove of the serration, the rotation of the planting bolt is more advantageously prevented and the contact area is increased. It is also possible to increase the drag force by obtaining a large amount.

In addition, since the deformation of the fitting plate member toward the inner peripheral side of the bolt planting hole due to the formation of the recessed portion is allowed by the concave groove of the serration, the thickness direction of the fitting plate member when the recessed portion is formed. It is possible to prevent the surface of the fitting plate member from rising in a convex shape between the bolt planting hole and the recessed portion by suppressing the deformation to.

A fifth aspect of the present invention is that in the bolt planting structure described in any one of the first to fourth aspects, the inner surface of the wall of the recessed portion on the side of the bolt planting hole is the bolt planting hole. It is inclined with respect to the penetrating direction, and the recessed portion expands toward the opening side.

According to the fifth aspect, for example, when a mold is pressed against the fitting plate member to form a recessed portion, the fitting plate member is more efficiently deformed to the bolt planting hole side due to the formation of the recessed portion. Therefore, the pulling resistance of the planting bolt can be obtained more advantageously.

A sixth aspect of the present invention is that in the bolt planting structure described in any one of the first to fifth aspects, the planting bolt is formed of a material having a hardness larger than that of the fitting plate member. It is something that is.

According to the sixth aspect, by forming the recessed portion in the fitting plate member formed of a material having a hardness smaller than that of the planting bolt, the pull-out drag force of the planting bolt can be relatively easily increased. Further, since plastic deformation of the planting bolt is not required, it is possible to adopt a planting bolt having a high hardness, and it is also possible to prevent deformation such as unintentional bending of the planting bolt.
Further, in the seventh aspect of the present invention, in the bolt planting structure described in any one of the first to sixth aspects, the fitting plate member and the connecting plate member are mutually fixed. The fitting plate member is thinner than the connecting plate member.

An eighth aspect of the present invention is an upper support that is attached to a piston rod of a shock absorber constituting a suspension mechanism and vibration-proofly connects the piston rod to a vehicle body, and is attached to an inner member attached to the piston rod. The vibration-proof main body to which the rubber elastic body of the main body is fixed is housed in an outer member having a hollow structure attached to the vehicle body, and the first plate member and the second plate on which the outer members are superposed with each other are housed. together is configured to include a member, said fitting plate member and the bolt implanted structures described said first plate member and said second plate member is in any one of claims 1 to 7 It is a connecting plate member, and the bolt planting hole is formed through the fitting plate member, and the shaft portion of the planting bolt is inserted into the bolt planting hole, and the bolt planting hole is inserted. The recessed portion is formed around the piston, and the surface pressure acting on the outer peripheral surface of the shaft portion of the planting bolt and the inner surface of the bolt planting hole in the fitting plate member is increased by the formation of the recessed portion. The feature is that the pull-out resistance of the planting bolt is increased.

According to the upper support having a structure according to the eighth aspect, at least one of the first plate member and the second plate member is a fitting plate member of the bolt planting structure according to the present invention. For the first plate member and the second plate member, which are relatively thin to form the outer member of the hollow structure, the planting bolt can be firmly strengthened without requiring plastic deformation of the planting bolt. Can be fixed.

Moreover, since the first plate member and the second plate member are overlapped with each other to form an outer member having a hollow structure, a hole for inserting a planting bolt is formed separately before being overlapped. There is also. In that case, the planting bolt is fitted to only one of the first plate member and the second plate member, but even in such a case, the planting bolt is recessed around the bolt planting hole. By forming the portion, it is possible to set a sufficiently large pull-out drag force of the planting bolt.

A ninth aspect of the present invention is a method for manufacturing a bolt planting structure , wherein a bolt having a diameter larger than that of the bolt planting hole is provided on one surface of a fitting plate member in which the bolt planting hole is formed. The fitting plate member and the connecting plate member are connected in a state in which the connecting plate member having the insertion hole formed is overlapped and the bolt planting hole and the bolt insertion hole are aligned with each other and connected in series. The step of fixing the bolt , the step of inserting the planting bolt into the bolt planting hole and the bolt insertion hole, and after inserting the planting bolt into the bolt planting hole, the fitting plate member is planted with the bolt. The circumference of the bolt planting hole in the fitting plate member is plastically deformed by pressing in the penetrating direction of the bolt planting hole from the surface opposite to the overlapping surface to the connecting plate member around the hole. A recessed portion located on the outer peripheral side of the bolt insertion hole on the surface opposite to the overlapping surface with the connecting plate member is formed on the fitting plate member , and the shaft portion of the planting bolt is formed. It is characterized by having a step of increasing the surface pressure acting on the outer peripheral surface and the inner surface of the bolt planting hole in the fitting plate member.

According to the method for manufacturing a bolt planting structure having a structure according to the ninth aspect, a recess is formed in the fitting plate member in a state where the planting bolt is inserted into the bolt planting hole of the fitting plate member. As a result, the resistance against the removal of the planting bolt can be increased. Moreover, while the fitting plate member is subjected to plastic working to form a recessed portion, it is not necessary to perform plastic working on the planting bolt, and the material and structure for forming the planting bolt can be selected with a great degree of freedom.

A tenth aspect of the present invention is the method for manufacturing a bolt planting structure according to the ninth aspect, in which a mold having a protruding portion protruding toward the fitting plate member is pressed against the fitting plate member. As a result, the fitting plate member has a step of forming the recessed portion corresponding to the protruding portion, and the side surface of the protruding portion on the side of the bolt planting hole is planted with the bolt toward the protruding tip. It is an inclined surface away from the hole.

According to the tenth aspect, the side surface of the protrusion provided on the mold on the bolt planting hole side is an inclined surface, so that the mold is pressed against the fitting plate member in the penetration direction of the bolt planting hole. When the recessed portion corresponding to the protruding portion is formed, the fitting plate member is easily deformed toward the bolt planting hole side due to the inclined surface of the protruding portion, and a larger pull-out resistance force of the planting bolt can be obtained.

According to the present invention, a recess is formed in the fitting plate member around the bolt planting hole through which the planting bolt is inserted, so that the bolt is planted on the outer peripheral surface of the shaft portion of the planting bolt and in the fitting plate member. The surface pressure acting on the inner surface of the hole is increased, and the pull-out drag force of the planting bolt is increased. As a result, the pull-out drag force of the planting bolt can be increased without requiring plastic working of the planting bolt, and the planting bolt can be made sufficiently strong without limiting the forming material and structure of the planting bolt. Can be fixed to the fitting plate member with.

It is sectional drawing which shows the bolt planting structure as the 1st Embodiment of this invention, and is the figure corresponding to the II sectional | cross section of FIG. The plan view of the bolt planting structure shown in FIG. FIG. 1 is a sectional view taken along line III-III of FIG. It is the schematic of the cross section which shows the manufacturing process of the bolt planting structure which concerns on this invention, (a) is the state which inserted the planting bolt into a bolt planting hole and a bolt insertion hole, (b) is a mold. The process of approaching the fitting plate member is shown in (c), in which a mold is pressed around the bolt planting hole to form a recessed portion. FIG. 5 is a cross-sectional view of an upper support having a bolt planting structure shown in FIG. 1, which corresponds to a VV cross section of FIG. The plan view of the upper support shown in FIG. FIG. 5 is a cross-sectional view showing a bolt planting structure as another embodiment of the present invention. FIG. 5 is a cross-sectional view showing a bolt planting structure as another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a bolt planting structure 10 as the first embodiment of the present invention. The bolt planting structure 10 has a structure in which the fitting plate member 12 and the connecting plate member 14 are superposed on each other, and the planting bolt 16 is provided so as to penetrate the fitting plate member 12 and the connecting plate member 14. doing. In the following description, the vertical direction means, in principle, the vertical direction in FIG.

More specifically, the fitting plate member 12 is formed of a metal such as ordinary steel or an aluminum alloy, a synthetic resin reinforced with carbon fibers, or the like, and includes a circular bolt planting hole 18 penetrating in the thickness direction. There is. On the other hand, the connecting plate member 14 is formed of metal, resin, or the like like the fitting plate member 12, and a bolt insertion hole 20 having a diameter larger than that of the bolt planting hole 18 is formed through in the thickness direction.

The fitting plate member 12 and the connecting plate member 14 are overlapped with each other in the thickness direction, and the bolt planting hole 18 of the fitting plate member 12 and the bolt insertion hole 20 of the connecting plate member 14 are positioned with each other in the vertical direction. Are connected in series with. In the present embodiment, the fitting plate member 12 in which the bolt planting hole 18 is formed in advance and the connecting plate member 14 in which the bolt insertion hole 20 is formed are overlapped with each other. Further, when the fitting plate member 12 and the connecting plate member 14 are overlapped with each other in a state where the bolt implantation hole 18 and the bolt insertion hole 20 are mutually positioned, the bolt insertion hole 20 has a larger diameter than the bolt insertion hole 18. Therefore, even if there is a dimensional error in each of the plate members 12 and 14, the entire bolt planting hole 18 is arranged on the vertical projection of the bolt insertion hole 20. ..

Further, a planting bolt 16 is inserted into the bolt planting hole 18 and the bolt insertion hole 20. As shown in FIG. 1, the planting bolt 16 has a male screw formed on the outer peripheral surface of the tip portion of the shaft portion 22, and serrations 26 are provided near the base end portion on the head portion 24 side of the shaft portion 22. ing. The serration 26 is formed by alternately forming a large number of concave grooves and ridges extending linearly in the axial direction of the shaft portion 22 in the circumferential direction, and is provided on the outer peripheral surface of the shaft portion 22 over the entire circumference. Has been done. The planting bolt 16 of the present embodiment is made of a material having a hardness higher than that of the fitting plate member 12, and is made of an alloy steel such as chrome molybdenum steel. The hardness of the planting bolt 16 and the fitting plate member 12 can be specified by a general hardness test such as a shore hardness test or a Vickers hardness test.

The planting bolt 16 is inserted into the bolt planting hole 18 of the fitting plate member 12 and the bolt insertion hole 20 of the connecting plate member 14 from below, and the head 24 of the planting bolt 16 is inserted into the bolt insertion hole 20. It is in contact with the lower surface of the connecting plate member 14 at the peripheral edge of the opening. In the present embodiment, the serration 26 of the planting bolt 16 is press-fitted into the bolt planting hole 18 of the fitting plate member 12, and the planting bolt 16 is inserted into the bolt planting hole 18. It is maintained in a state of being inserted into the bolt planting hole 18 and the bolt insertion hole 20 with a certain amount of pull-out resistance. However, the planting bolt 16 may be inserted into the bolt planting hole 18 in a manner that allows it to be easily inserted and removed without being fitted.

Further, in the shaft portion 22 of the planting bolt 16, the upper portion of the serration 26 inserted into the bolt planting hole 18 is fitted to the fitting plate member 12, while the lower portion of the serration 26 inserted into the bolt insertion hole 20. Is arranged with a gap with respect to the inner surface of the bolt insertion hole 20 without being fitted to the connecting plate member 14. The serration 26 does not protrude above the upper opening of the bolt planting hole 18, and is arranged in a housed state in the inner circumference of the bolt planting hole 18 and the bolt insertion hole 20.

Further, the fitting plate member 12 is formed with a recessed portion 28 around the bolt planting hole 18 into which the planting bolt 16 is inserted. The recessed portion 28 has a groove shape that opens on the upper surface of the fitting plate member 12 and extends in the circumferential direction on the outer peripheral side of the bolt planting hole 18. In particular, in the present embodiment, the outer peripheral side of the bolt planting hole 18 is formed. It is an annular groove that extends continuously over the entire circumference. Further, the recessed portion 28 is provided at a position separated from the bolt planting hole 18 on the outer peripheral side, and an inner peripheral wall portion of the recessed portion 28 is formed between the recessed portion 28 and the bolt planting hole 18. An annular contact portion 30 is formed. Further, the inner surface of the side wall on the inner peripheral side of the recessed portion 28 is a tapered surface 32 that inclines toward the inner peripheral side as it goes upward, and gradually widens in the radial direction as the recessed portion 28 becomes the opening side and goes upward. It is expanding so that it becomes.

The recessed portion 28 is formed by pressing downward on the upper surface of the fitting plate member 12 around the bolt planting hole 18 and downwardly pressing the pressurized portion on the upper surface of the fitting plate member 12 so as to be recessed downward. Has been done. Here, when the recessed portion 28 is formed in the fitting plate member 12, the close contact portion 30 of the fitting plate member 12 is deformed toward the inner peripheral side of the bolt planting hole 18, and the planting bolt 16 is inserted into the bolt. The inner surface of the planting hole 18 is pressed against the outer peripheral surface of the serration 26 of the planting bolt 16. As a result, the surface pressure acting on the inner surface of the hole of the bolt planting hole 18 and the outer peripheral surface of the serration 26 of the planting bolt 16 is increased by the formation of the recess 28, and the surface pressure is increased from the bolt planting hole 18 of the planting bolt 16. The resistance to the omission of the bolt is increasing. The fitting plate member 12 of the present embodiment is slightly raised upward in the close contact portion 30 due to the formation of the concave portion 28, but for example, the upper surface of the close contact portion 30 is depressed while being pressed by a mold or the like. By forming the portion 28, the fitting plate member 12 may be prevented from rising upward in the close contact portion 30.

Further, as shown in FIG. 3, the fitting plate member 12 is deformed so as to enter the concave groove of the serration 26 of the planting bolt 16 by forming the recessed portion 28, and the outer peripheral surface of the serration 26 becomes the entire circumference. It is fitted to the inner surface of the bolt planting hole 18 in the fitting plate member 12. In FIG. 3, the unevenness of the serration 26 is exaggerated for the sake of clarity.

According to the bolt planting structure 10 according to the present embodiment, the recessed portion 28 is formed in the fitting plate member 12, so that the outer peripheral surface of the shaft portion 22 of the planting bolt 16 and the hole of the bolt planting hole 18 are formed. The surface pressure acting on the inner surface is increased, and it is possible to set a large drag against the removal of the planting bolt 16. Therefore, even when the thickness of the fitting plate member 12 is small and the fitting area of the planting bolt 16 with respect to the fitting plate member 12 cannot be sufficiently obtained, the desired pull-out drag force can be set.

In particular, in the present embodiment, in order to allow an error in the relative position between the bolt planting hole 18 of the fitting plate member 12 and the bolt insertion hole 20 of the connecting plate member 14, the bolt insertion hole 20 is the bolt planting hole 18. Since the diameter is larger than that, the planting bolt 16 is fixed only to the fitting plate member 12 without being fixed to the connecting plate member 14. Even with such a structure, by forming the recessed portion 28 in the fitting plate member 12, it is possible to sufficiently secure the pull-out drag force of the planting bolt 16.

Further, in the bolt planting structure 10, in order to improve the pull-out drag force of the planting bolt 16, the fitting plate member 12 is plastically processed to form a recessed portion 28, while the planting bolt 16 needs to be plastically processed. Is not considered. Therefore, the forming material, material, structure, etc. of the planting bolt 16 are not particularly limited and can be designed with a large degree of freedom of selection. Therefore, the durability and dimensional accuracy required for the planting bolt 16 are highly improved. It will be possible to realize.

In particular, by forming the planting bolt 16 with a material having a hardness higher than that of the fitting plate member 12, such as the planting bolt 16 of the present embodiment, it is possible to prevent the planting bolt 16 from being deformed such as unintentional bending. The process of forming the recessed portion 28 in the fitting plate member 12 becomes easy, and the pull-out drag force of the planting bolt 16 can be relatively easily increased.

Further, since the recessed portion 28 formed in the fitting plate member 12 has a groove shape extending in the circumferential direction of the bolt planting hole 18, the inner peripheral surface of the bolt planting hole 18 and the shaft of the planting bolt 16 The outer peripheral surface of the portion 22 is pressed over a wider range in the circumferential direction by the formation of the recessed portion 28, and the pull-out drag force of the planting bolt 16 is increased more effectively.

Further, in the present embodiment, the recessed portion 28 is an annular groove that continuously extends around the entire circumference of the bolt planting hole 18. As a result, when the recessed portion 28 is formed around the bolt planting hole 18 through which the planting bolt 16 is inserted, the deformation of the fitting plate member 12 in the surface direction due to the formation of the recessed portion 28 causes the circumference of the recessed portion 28 to be deformed. It can be prevented from occurring in the direction. As a result, the deformation of the fitting plate member 12 due to the formation of the recessed portion 28 is efficiently generated on the inner peripheral side of the bolt planting hole 18, and the pull-out drag force of the planting bolt 16 due to the formation of the recessed portion 28 is increased. It will be realized even more effectively.

Further, since the serration 26 is provided at the fitting portion of the shaft portion 22 of the planting bolt 16 to the inner surface of the bolt planting hole 18, the inner peripheral side of the bolt planting hole 18 is formed by forming the recessed portion 28. The fitting plate member 12 deformed into the shape enters the concave groove of the serration 26. Therefore, a large contact area between the inner surface of the bolt planting hole 18 and the planting bolt 16 in the fitting plate member 12 can be obtained to increase the pull-out drag force more effectively and prevent the planting bolt 16 from rotating. Etc. are realized.

Moreover, since the deformation of the bolt planting hole 18 of the fitting plate member 12 toward the inner peripheral side due to the formation of the recessed portion 28 is allowed by the concave groove of the serration 26, the fitting plate member 12 is deformed in the thickness direction. It is possible to prevent the surface of the fitting plate member 12 from rising in a convex shape between the bolt planting hole 18 and the recessed portion 28.

Further, since the inner surface of the wall of the recessed portion 28 on the bolt planting hole 18 side is a tapered surface 32 that is inclined with respect to the penetration direction of the bolt planting hole 18, for example, a mold 34 described later is pressed against it. When the recessed portion 28 is formed, the fitting plate member 12 is deformed more efficiently toward the bolt planting hole 18 due to the formation of the recessed portion 28, so that the dragging force of the planting bolt 16 can be obtained more advantageously. be able to.

The bolt planting structure 10 having a structure according to the present embodiment as described above can be obtained, for example, by the manufacturing method shown below. Note that FIG. 4 referred to in the following description is a schematic view for explaining a method of manufacturing a bolt planting structure.

First, the fitting plate member 12 having the bolt planting hole 18 prepared in advance and the connecting plate member 14 having the bolt insertion hole 20 are superposed on each other to form the bolt planting hole 18 and the bolt insertion hole 20. Position them so that they are connected in series. Here, as shown in FIG. 4A, the recessed portion 28 is not formed in the fitting plate member 12. The fitting plate member 12 and the connecting plate member 14 may be fixed to each other by fitting and fixing the planting bolt 16 described later, or may be mutually fixed by means such as welding before or after the insertion of the planting bolt 16. It may be fixed to. The method for manufacturing the fitting plate member 12 and the connecting plate member 14 is not particularly limited, but in the case of metal, for example, it can be obtained by pressing a metal base plate into a predetermined shape. On the other hand, in the case of synthetic resin, it can be obtained by injection molding or the like.

Next, as shown in FIG. 4A, the planting bolt 16 prepared in advance is inserted into the bolt planting hole 18 of the fitting plate member 12 and the bolt insertion hole 20 of the connecting plate member 14. In the present embodiment, the serration 26 of the shaft portion 22 of the planting bolt 16 is inserted into the bolt insertion hole 20 with a gap and is press-fitted into the bolt planting hole 18. The method for manufacturing the planting bolt 16 is not particularly limited, but it can be obtained by, for example, processing a metal wire rod into a predetermined shape by forging.

Next, as shown in FIG. 4B, the mold 34 is moved toward the upper surface of the fitting plate member 12 in the direction of the arrow in the drawing. The mold 34 is made of a material such as alloy steel having a hardness larger than that of the fitting plate member 12, and has a through hole 36 through which the shaft portion 22 of the planting bolt 16 is inserted with a gap. An annular projecting portion 38 projecting downward is formed, and the projecting portion 38 surrounds the outer peripheral side of the through hole 36 and extends in the circumferential direction. Further, the inner peripheral surface of the protruding portion 38 of the mold 34 is an inclined surface that gradually separates from the through hole 36 toward the protruding tip and inclines toward the outer circumference, and the protruding portion 38 gradually widens toward the proximal end side. It is said that.

Then, as shown in FIG. 4C, the mold 34 is pressed against the upper surface of the fitting plate member 12 with the planting bolt 16 inserted into the bolt planting hole 18, and the protruding portion 38 of the mold 34 is pressed. The recessed portion 28 corresponding to the above is formed in the fitting plate member 12. That is, when the protruding portion 38 of the mold 34 is pressed against the fitting plate member 12, the fitting plate member 12 is deformed by the pressing of the protruding portion 38, and the recessed portion 28 is formed in the fitting plate member 12 by plastic deformation. The close contact portion 30 provided on the inner peripheral side of the recessed portion 28 is deformed to the inner peripheral side of the bolt planting hole 18, and the inner surface of the hole of the bolt planting hole 18 is moved to the inner peripheral side of the bolt planting hole 18. It deforms to swell. As a result, the inner surface of the bolt planting hole 18 in the fitting plate member 12 is strongly pressed against the serration 26 of the shaft portion 22 in the planting bolt 16, and the dragging force of the planting bolt 16 due to the increase in surface pressure is increased. Can be planned. When forming the recessed portion 28, the temperature can be appropriately controlled.

In particular, in the present embodiment, the protruding portion 38 is narrowed toward the protruding tip, and the side surface of the protruding portion 38 on the inner peripheral side is inclined with respect to the pressing direction of the mold 34 against the fitting plate member 12. Since it is an inclined surface, when the mold 34 is pressed against the fitting plate member 12, the bolt planting hole 18 side with respect to the contact portion of the fitting plate member 12 with the inner peripheral side surface of the protruding portion 38. The acting component works. As a result, the fitting plate member 12 is deformed toward the inner peripheral side of the bolt planting hole 18, and the inner surface of the bolt planting hole 18 in the fitting plate member 12 is inserted into the bolt planting hole 18. Since the planting bolt 16 is pressed more strongly against the outer peripheral surface of the shaft portion 22, the pull-out drag force of the planting bolt 16 against the fitting plate member 12 is increased.

Next, the mold 34 is displaced so as to be separated from the fitting plate member 12, and the mold 34 is removed to complete the manufacturing process related to the manufacturing method of the bolt planting structure, and the mold 34 is planted in the fitting plate member 12. The bolt planting structure 10 of FIG. 1 in which the bolt 16 is fitted and fixed can be obtained.

By the way, the bolt planting structure 10 according to the present invention shown in FIG. 1 can be applied to, for example, an upper support 40 for an automobile as shown in FIGS. 5 and 6. The upper support 40 is attached to the piston rod 42 of the shock absorber that constitutes the suspension mechanism, and the piston rod 42 is vibration-proof connected to a member on the vehicle body side such as the subframe 44. The upper support 40 to which the bolt planting structure 10 is applied will be described below.

More specifically, the upper support 40 has a structure in which the inner member 46 and the outer member 48 are elastically connected by the main body rubber elastic body 50. In particular, in the present embodiment, the inner member 46 and the intermediate member 52 are the main body. The vibration-proof main body portion 54 elastically connected by the rubber elastic body 50 has a structure accommodated and arranged in the outer member 48 having a hollow structure. In the following description, the vertical direction means the vertical direction in FIG. 5 which is the axial direction unless otherwise specified.

The inner member 46 is made of metal or the like and has a substantially annular plate shape as a whole, and the inner peripheral end portion protrudes downward to be thick. The inner member 46 is connected to the piston rod 42 of the shock absorber inserted into the inner hole by a nut 56 screwed to the piston rod 42.

The intermediate member 52 is made of metal or the like and has a substantially cylindrical shape with a thin wall and a large diameter, and is extrapolated with a gap in the radial direction with respect to the inner member 46.

An annular main body rubber elastic body 50 is arranged between the inner member 46 and the intermediate member 52, and the inner peripheral portion of the main body rubber elastic body 50 is vulcanized and adhered to the inner member 46 and the main body. The outer peripheral surface of the rubber elastic body 50 is vulcanized and adhered to the intermediate member 52. Further, the main body rubber elastic body 50 is also fixed to both sides of the outer peripheral portion of the inner member 46, protrudes to both sides in the vertical direction with respect to the inner member 46, and has a large vertical protrusion dimension from the inner member 46. The formed portion and the reduced portion are provided alternately in the circumferential direction.

The vibration-proof main body portion 54 in which the inner member 46 and the intermediate member 52 are elastically connected by the main body rubber elastic body 50 is attached to the outer member 48. The outer member 48 includes a first plate member 58 having a substantially annular plate shape and a second plate member 60 having a substantially shallow plate shape. Further, the second plate member 60 is provided with a reinforcing flange 62 extending toward the outer peripheral side at the upper end portion, and the reinforcing flange 62 of the second plate member 60 is overlapped with the outer peripheral portion of the first plate member 58. It is fixed by means such as spot or projection welding. However, when the outer member 48 is made of steel or the like, the first plate member 58 and the second plate member 60 can be fixed by welding as described above, but the outer member 48 is made of an aluminum alloy or synthetic resin. In the case of being formed of, for example, the first plate member 58 and the second plate member 60 are fixed by means such as mechanical clinching or caulking.

Then, the first plate member 58 and the second plate member 60 are overlapped and fixed to each other in the vertical direction, and the opening portion of the second plate member 60 is covered with the first plate member 58. A space is formed between the first plate member 58 and the second plate member 60. Then, the intermediate member 52 is press-fitted and fixed to the peripheral wall portion of the second plate member 60, so that the vibration-proof main body portion 54 is accommodated and arranged between the first plate member 58 and the second plate member 60. Is attached to the outer member 48. In the main body rubber elastic body 50, the portion protruding vertically from the outer peripheral portion of the inner member 46 is between the inner member 46 and the first plate member 58, and between the inner member 46 and the second plate member 60. In each of them, they are sandwiched and compressed. As a result, the vibration-proof effect due to the elastic deformation of the main body rubber elastic body 50 is exhibited with respect to the vibration input in the axial direction and the axial perpendicular direction.

Here, the outer peripheral portion of the first plate member 58 is the fitting plate member 12 of the bolt planting structure 10, and the reinforcing flange 62 of the second plate member 60 is the connecting plate member 14 of the bolt planting structure 10. It is said that. Then, three bolt planting holes 18, 18, 18 are formed through the outer peripheral portion of the first plate member 58 as the fitting plate member 12 (see FIG. 6), while the connecting plate member 14 is used. Bolt insertion holes 20, 20, 20 are formed through the reinforcing flange 62 of the second plate member 60 at positions corresponding to the bolt planting holes 18, 18, 18 of the first plate member 58.

Further, as shown in FIG. 5, the planting bolt 16 is inserted from below into the bolt planting hole 18 and the bolt insertion hole 20 which are connected in series in the vertical direction. In the planting bolt 16, serrations 26 provided at the base end portion of the shaft portion 22 are inserted into the bolt insertion holes 20 and the bolt planting holes 18, and the serrations 26 are fitted into the bolt planting holes 18. .. Further, the head 24 of the planting bolt 16 is overlapped with the opening peripheral edge of the bolt insertion hole 20 on the lower surface of the second plate member 60 in a contact state over the entire circumference.

Further, on the outer peripheral side of each bolt planting hole 18 in the first plate member 58, an annular recess 28 is formed in a state where the planting bolt 16 is inserted through the bolt planting hole 18. As a result, the surface pressure acting on the inner surface of the bolt planting hole 18 in the first plate member 58 and the outer peripheral surface of the shaft portion 22 of the planting bolt 16 is increased, and the first plate of the planting bolt 16 is increased. The pull-out drag force against the member 58 is increased. As a result, as shown in FIGS. 5 and 6, the outer member 48 including the first plate member 58 and the second plate member 60 has three planting bolts 16, 16 and 16 with the shaft portion 22 facing upward. These planting bolts 16, 16 and 16 are stably held in a state of being fitted and fixed to the first plate member 58.

Then, a subframe 44 on the vehicle body side is attached to the outer member 48. That is, the subframe 44 is superposed on the upper surface of the first plate member 58 of the outer member 48, and the three planting bolts 16, 16 and 16 of the outer member 48 are formed through the subframe 44 through the bolt holes 64. The subframe 44 is attached to the outer member 48 by screwing the nuts 66 to the planting bolts 16, 16 and 16, respectively. The subframe 44 is virtually shown by a chain double-dashed line in FIG.

According to the upper support 40 having a structure according to the present embodiment, the planting bolt 16 for connecting the outer member 48 and the vehicle subframe 44 or the like has a plate shape that realizes the hollow outer member 48. The first plate member 58 is planted with a sufficiently large pull-out drag by the bolt planting structure 10. Therefore, the vibration-proof connection state of the subframe 44 and the piston rod 42 by the upper support 40 can be stably maintained for a long period of time with excellent reliability.

In particular, since the outer member 48 having a hollow structure is formed by superimposing the first plate member 58 and the second plate member 60, the first plate member 58 and the second plate member 60 are A bolt planting hole 18 and a bolt insertion hole 20 are formed in advance before they are overlapped. In such a case, the bolt insertion hole 20 may have a larger diameter than the bolt insertion hole 18 in order to allow an error in the relative position and size of the bolt planting hole 18 and the bolt insertion hole 20. The planting bolt 16 may not be fitted into the bolt insertion hole 20 of the second plate member 60, but may be fitted only into the bolt planting hole 18 of the first plate member 58. As described above, even if the fitting area of the planting bolt 16 is small, the planting bolt 16 can be provided with excellent reliability by improving the pull-out drag force of the planting bolt 16 by forming the recessed portion 28. It can be fixed to the first plate member 58.

Further, since the subframe 44 is superposed on the upper surface of the outer peripheral portion of the first plate member 58 in which the bolt planting hole 18 is formed in the vehicle-mounted state of the upper support 40, after the recessed portion 28 is formed. It is desirable that the convex portion is not formed on the upper surface of the first plate member 58, or even if it is formed, the protruding dimension can be kept small. In the present embodiment, the recessed groove of the serration 26 is formed in the fitting portion of the planting bolt 16 into the bolt planting hole 18, and the inner surface of the hole of the bolt planting hole 18 is allowed to be deformed into the recessed groove. At the same time, since the bolt insertion hole 20 has a larger diameter than the bolt planting hole 18, downward deformation of the opening peripheral edge portion of the bolt planting hole 18 is allowed. As a result, when the fitting plate member 12 is deformed around the bolt planting hole 18 due to the formation of the recessed portion 28, the amount of upward protrusion deformation is reduced, and the subframe 44 becomes the first plate member 58. It can be stacked in a stable state.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description thereof. For example, in the above-described embodiment, a structure in which the fitting plate member 12 and the connecting plate member 14 are overlapped is exemplified, but the connecting plate member 14 is omitted as in the bolt planting structure 70 shown in FIG. 7, for example. It is also possible to provide only the fitting plate member 12. Further, for example, a structure in which the fitting plate member 12 and a plurality of connecting plate members 14 are overlapped can be adopted.

Further, in the above-described embodiment, the fitting plate member 12 is provided on the tip end side of the shaft portion 22 of the planting bolt 16, and the connecting plate member 14 is provided on the head 24 side of the planting bolt 16. As in the bolt planting structure 80 shown in FIG. 8, the head 24 of the planting bolt 16 is superposed on the lower surface of the fitting plate member 12 in a contact state, and the connecting plate member 14 sandwiches the fitting plate member 12. It may be overlapped on the side opposite to the head 24. In the structure of FIG. 8, the bolt insertion hole 20 is larger than the bolt planting hole 18 so that a protrusion of a mold (not shown) can be inserted between the inner surface of the hole of the bolt insertion hole 20 and the radial direction of the planting bolt 16. The diameter is large, and the recessed portion 28 of the fitting plate member 12 is formed so as to open toward the bolt insertion hole 20.

Further, the planting bolt 16 may be fitted to a plurality of plate members. Specifically, for example, when the planting bolt 16 is inserted into the bolt holes of a plurality of plate members, the insertion portion of the planting bolt 16 into the bolt holes is the inner peripheral surface of each bolt hole of the plurality of plate members. The planting bolt 16 may be more firmly fixed by forming a recessed portion 28 in at least one of the plurality of plate members. Further, it is also possible to provide a plurality of fitting plate members 12 in which the recessed portion 28 is formed and fitted to the planting bolt 16. For example, when two fitting plate members 12, 12 are overlapped and adopted. Inserts the planting bolt 16 into the bolt planting hole 18 of one fitting plate member 12 to form a recessed portion 28, and then inserts the planting bolt 16 into the bolt planting hole 18 of the other fitting plate member 12. The recessed portion 28 may be formed.

Further, the serration 26 provided on the shaft portion 22 of the planting bolt 16 in the above embodiment is not indispensable, and as shown in the bolt planting structure 80 of FIG. 8, fitting of the planting bolt 16 on the shaft portion 22 The outer peripheral surface of the fitting portion to the plywood member 12 may be a cylindrical surface on which serrations (concave grooves and ridges) are not formed.

Further, the specific structure of the planting bolt 16 is not particularly limited. For example, the shaft portion 22 having no head 24 and having a thread formed extends from the serration 26 toward both sides in the axial direction. Planting bolts with the same structure can also be used. When such a planting bolt having no head is adopted, recessed portions 28 may be formed on both sides of the fitting plate member.

Further, the specific shape of the recessed portion shown in the above embodiment is merely an example, and may be, for example, a groove shape extending in the circumferential direction with a length less than one circumference around the bolt planting hole 18. It is possible. Further, by arranging a plurality of grooves having less than one circumference in the circumferential direction around the bolt planting hole 18, it is possible to form a recessed portion that extends intermittently over the entire circumference in the circumferential direction. Furthermore, the recessed portion is not limited to a groove shape extending in the circumferential direction of the bolt planting hole 18, for example, by providing a plurality of circular recesses in a circumferential direction around the bolt planting hole 18. It is also possible to obtain a recess that surrounds the bolt planting hole 18.

10, 70, 80: Bolt planting structure, 12: Fitting plate member, 14: Connecting plate member, 16: Planting bolt, 18: Bolt planting hole, 20: Bolt insertion hole, 22: Shaft, 26: Serration , 28: recessed part, 34: mold, 38: protruding part, 40: upper support, 42: piston rod, 44: subframe (vehicle body), 46: inner member, 48: outer member, 50: main body rubber elasticity Body, 54: Anti-vibration body, 58: First plate member, 60: Second plate member

Claims (10)

A bolt planting hole is formed through the fitting plate member, the planting bolt is inserted through the bolt planting hole, and the shaft portion of the planting bolt is fitted and fixed to the bolt planting hole. In the planting structure
The connecting plate member is overlapped and fixed on one surface of the fitting plate member.
A bolt insertion hole having a diameter larger than that of the bolt planting hole is formed through the connecting plate member, and the bolt planting hole and the bolt insertion hole are aligned with each other and connected in series. Ori
The fit to the periphery of the bolt planting設孔inserted through the implanted bolts in plywood members, in the surface opposite to the overlapping surface to the connecting plate member, the fitting plate member the bolt planting設孔A recessed portion is formed that is pressed and deformed in the penetrating direction of the planting bolt, and the surface pressure acting on the outer peripheral surface of the shaft portion of the planting bolt and the inner surface of the hole of the bolt planting hole in the fitting plate member is the recessed portion. while omission drag enhanced by the formation in the plant setting bolt is made to increase,
The bolt insertion hole in the connecting plate member is made larger than the outer diameter of the inserted planting bolt, and
A bolt planting structure characterized in that the recessed portion formed in the fitting plate member is positioned on the outer peripheral side of the bolt insertion hole in the connecting plate member . The bolt planting structure according to claim 1, wherein the recessed portion has a groove shape extending in the circumferential direction of the bolt planting hole. The bolt planting structure according to claim 2, wherein the recessed portion is an annular groove that continuously extends around the entire circumference of the bolt planting hole. The bolt planting structure according to any one of claims 1 to 3, wherein serrations are provided at a portion of the shaft portion of the planting bolt that fits into the bolt planting hole. Claims 1 to 4 in which the inner surface of the wall of the recessed portion on the side of the bolt planting hole is inclined with respect to the penetrating direction of the bolt planting hole, and the recessed portion is widened toward the opening side. The bolt planting structure according to any one item. The bolt planting structure according to any one of claims 1 to 5 , wherein the planting bolt is made of a material having a hardness larger than that of the fitting plate member. The bolt planting structure according to any one of claims 1 to 6, wherein the fitting plate member is thinner than the connecting plate member. It is an upper support that is attached to the piston rod of the shock absorber that constitutes the suspension mechanism and that is vibration-proof and connected to the vehicle body.
A vibration-proof main body portion in which a main body rubber elastic body is fixed to an inner member attached to the piston rod is housed in an outer member having a hollow structure attached to the vehicle body, and the outer members are superposed on each other. together is configured to include a first plate member and second plate member, said first plate member and said second plate member has a bolt planting according to any one of claims 1 to 7 The fitting plate member and the connecting plate member of the installation structure are formed, the bolt planting hole is formed through the fitting plate member, and the shaft portion of the planting bolt is inserted into the bolt planting hole. At the same time, the recessed portion is formed around the bolt planting hole, and the surface pressure acting on the outer peripheral surface of the shaft portion of the planting bolt and the inner surface of the hole of the bolt planting hole in the fitting plate member. The upper support is characterized in that is enhanced by the formation of the recessed portion and the pull-out drag force of the planting bolt is increased. A connecting plate member having a bolt insertion hole having a diameter larger than that of the bolt planting hole is superposed on one surface of the fitting plate member having the bolt planting hole formed, and the bolt planting hole is formed. A step of fixing the fitting plate member and the connecting plate member in a state where the bolt insertion holes are aligned with each other and connected in series.
The process of inserting a planting bolt into the bolt planting hole and the bolt insertion hole, and
After the planting bolt is inserted into the bolt planting hole, the fitting plate member is placed around the bolt planting hole from a surface opposite to the surface on which the connecting plate member is overlapped. By pressing in the penetrating direction to plastically deform the periphery of the bolt planting hole in the fitting plate member, the surface opposite to the overlapping surface to the connecting plate member is on the outer peripheral side of the bolt insertion hole. A step of forming a recessed portion located in the fitting plate member on the fitting plate member and increasing the surface pressure acting on the outer peripheral surface of the shaft portion of the planting bolt and the inner surface of the bolt planting hole in the fitting plate member. , A method of manufacturing a bolt planting structure, characterized by having. The fitting plate member is provided with a step of forming the recessed portion corresponding to the protruding portion on the fitting plate member by pressing a mold having a protruding portion protruding toward the fitting plate member against the fitting plate member. The method for manufacturing a bolt planting structure according to claim 9, wherein the side surface of the projecting portion on the side of the bolt planting hole is an inclined surface that is separated from the bolt planting hole toward the projecting tip.

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