Clinching stud bolt

Abstract

[Problem] To provide a clinching stud in which the entire head part can be embedded into a press-fit member. [Solution] A clinching stud bolt 1 fixed to a press-fit member W comprises a head part 2, a shaft part 3 continuously provided with the head part, and a plurality of recessed parts 4 circumferentially formed in a seating surface 2a of the head part. Since the press-fit member W fills the recessed parts 4, the head part 2 can be completely embedded into the press-fit member W, and hence the clinching stud bolt 1 can be fixed in a space-saving manner.

Description

Clinching stud bolt

[0001] The present invention relates to a clinching stud bolt that is used by press-fitting the head of the clinching stud bolt into a pilot hole previously formed in a press-fitted member.

[0002] Conventionally, as a press-fit screw, a clinching stud shown in Patent Document 1 is known. This clinching stud has a head and a shaft portion continuously provided on this head, and a male thread is formed on this shaft portion. Further, six lobe-shaped protrusions are formed on the seating surface of the head in the radial direction, and the protrusions are configured to be embedded in the press-fitted member as the head is seated. Thereby, the relative rotation of the clinching stud is inhibited. Further, an annular groove is formed in the shaft portion at the connection portion with the head, and the press-fitted member that has flowed due to plastic deformation when the protrusion is embedded in the press-fitted member flows into the annular groove. Thereby, the clinching stud is fixed.

[0003] Japanese Utility Model Laid-Open No. 59-34107

[0004] However, in a shape in which protrusions are provided on the seating surface of the head like the above-mentioned clinching stud, the thickness of the head increases, so it is difficult to embed the entire head in the press-fitted member. For this reason, there was a problem that it could not be used in places where space saving was required.

[0005] The present invention was created in view of the above problems, and an object thereof is to provide a clinching stud bolt capable of embedding the entire head in a press-fitted member.

[0006] The above problem can be solved by a clinching stud bolt fixed to a press-fitted member, which is composed of a head, a shaft portion continuously provided on this head, and a plurality of recesses formed on the circumference of the seating surface of the head.

[0007] The recess provided on the seating surface of the head preferably has a circular opening.

[0008] The recess provided on the seating surface of the head preferably includes an opening portion where a part of the inner wall opens to the outer peripheral surface of the head.

[0009] According to the present invention, since the head is configured to have a recess provided on the seating surface and the press-fit member filled into it, the head can be completely embedded in the press-fit member, making it possible to fix it in a space-saving manner.

[0010] This is a perspective view of the clinching stud bolt according to the present invention. This is a bottom view of the clinching stud bolt according to the present invention. This is a cross-sectional view of the clinching stud bolt according to the present invention with a portion cut out. This is a cross-sectional view showing the clinching stud bolt according to the present invention in use.

[0011] The configuration of the clinching stud bolt of the present invention will be described below with reference to the drawings. In Figure 1, 1 is a clinching stud bolt, and is composed of a circular head 2 having a predetermined thickness and a shaft portion 3 connected to the head 2. The portion connecting the head 2 and the shaft portion 3 is formed into a constricted portion 3a. Furthermore, an external thread 3b that can be screwed into an internal thread formed into a nut or the like is integrally molded on the outer circumferential surface of the shaft portion 3.

[0012] A recess 4 is formed in the seating surface 2a of the head 2. This recess 4 is circular in shape and has a tapered inner wall, and is recessed in a mortar-like shape relative to the seating surface 2a of the head.

[0013] Furthermore, as shown in Figure 2, the recesses 4 of the head portion 2 are arranged at equal intervals on the same circumference of the seat surface 2a, meaning that the nine recesses 4 are arranged in a ring shape.

[0014] Furthermore, as shown in Figure 3, the outer circumferential surface of the head 2 is formed as an inclined portion that slopes toward the centerline of the shaft portion 3, and the recess 4 has an open portion 4a in which a part of its inner wall opens to the outer circumferential surface of the head 2. In other words, the open portion 4a of the recess 4 opens to the inclined outer circumferential surface of the head 2.

[0015] Furthermore, as shown in Figure 2, when an action occurs that causes the press-fit member W, which is filled in the recess 4, to move in the radial direction of a circle centered on the seat surface 2a, the edge 4b ​​of the open portion 4a of the recess 4 is configured to catch on the press-fit member W filled in the recess 4, and thus has the function of preventing the press-fit member W from shifting due to this action.

[0016] As shown in Figure 4, in order to fix the clinching stud bolt 1 to the member to be pressed in W, the shaft portion 3 is inserted into a pre-drilled hole in the member to be pressed in W, and then the seating surface 2a of the head portion 2 is pressed onto the surface of the member to be pressed in W, and the head portion 2 is completely embedded until the surface of the head portion 2 and the surface of the member to be pressed in W are on the same plane. At this time, it is preferable that the constricted portion 3a is also completely embedded in the member to be pressed in W.

[0017] According to the clinching stud bolt 1 described above, since the head 2 is provided on the seating surface 2a and the recess 4 is filled with the member to be pressed in W, the head 2 can be completely embedded in the member to be pressed in W, making it possible to fix it in a space-saving manner.

[0018] Furthermore, since the nine recesses 4 are provided independently, each is filled with the press-fitted member W, providing an anti-rotation effect. In particular, by shaping the recesses 4 into a circular form and arranging the centers of all nine recesses 4 on the same circumference, an even greater anti-rotation effect can be achieved.

[0019] Furthermore, a constricted portion 3a is provided at the connection point between the head portion 2 and the shaft portion 3, and when the press-fitted member W is filled into this portion, it exhibits a retaining effect.

[0020] Furthermore, since the recess 4 is provided with an open portion 4a that opens onto the outer circumferential surface of the head 2, it exhibits excellent flow characteristics due to the plastic deformation of the member W when the head 2 is pressed into the member W, making it easy to embed the head 2 and applicable to members W made of various materials.

[0021] Furthermore, the specific configuration of each part of the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the present invention.

[0022] 1. Clinching stud bolt 2. Head 2a. Seat surface 3. Shaft 3a. Narrowed portion 3b. Male thread 4. Recess 4a. Open portion 4b. Edge W. Press-fitted member

Claims

1. A clinching stud bolt for fixing to a press-fit member, characterized by comprising: a head; a shaft portion connected to the head; and a plurality of recesses drilled circumferentially on the seating surface of the head.

2. The clinching stud bolt according to claim 1, characterized in that the recess provided on the seating surface of the head has a circular opening.

3. The clinching stud bolt according to claim 1 or 2, characterized in that the recess provided on the seating surface of the head has an open portion in which a part of its inner wall opens to the outer surface of the head.

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