JP2500074B2 - Bearing fitting and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing fitting for rotatably supporting a shaft and a method for manufacturing the same, and more particularly, to a flat metal body having a curl portion having a predetermined outer diameter. The present invention relates to a bearing fitting, which is curved from the front surface side to the back surface side, and in which the shaft is relatively rotatably fitted in the curl portion, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Heretofore, as this type of bearing fitting, for example, one which rotatably supports a rod (shaft) connected to a seat unlocking handle provided in a seat slide device of an automobile is known. There is.

Such a bearing metal fitting has a flat metal fitting body,
A curl portion which is fitted to the outer peripheral portion of the rod so as to be rotatable relative to the rod is curved and formed in a substantially C shape. The curl portion is curved and formed to have a predetermined outer diameter with reference to the outer peripheral surface,
The rod is rotatably fitted therein. And
The rod is pivotally operated by the lock release handle attached to the tip of the rod, and the rod is pivoted in one direction to unlock the seat by the seat slide device. The position of the seat can be adjusted.

[0004]

However, since the curl portion of the above-mentioned conventional bearing fitting is simply curved and formed to have a predetermined outer diameter with reference to the outer peripheral surface thereof, the inner diameter of the fitting has a main body. Variation of the plate thickness tolerance occurs, which causes play between the sliding contact surface between the inner peripheral surface of the curl portion and the outer peripheral surface of the rod. As a result, there is a problem that, for example, when the automobile runs on a rough road, the lock release handle at the tip of the rod vibrates greatly, and abnormal noise is generated between the rod and the curl portion of the bearing fitting.

An object of the present invention is to improve the dimensional accuracy of the inner diameter of a curl portion which is curved and formed to have a predetermined outer diameter with reference to the outer peripheral surface so that the inner peripheral surface of the curl portion and the outer peripheral surface of the shaft slide. It is an object of the present invention to provide a bearing fitting capable of eliminating play between contact surfaces and a manufacturing method thereof.

[0006]

According to the bearing fitting of the present invention, a curl portion having a predetermined outer diameter is formed by curving from a front surface side to a back surface side of the metal body in a flat metal body, and the curl is formed. In a bearing fitting in which a shaft is relatively rotatably fitted inside the portion, the inner peripheral surface of the curl portion protrudes inward of the curl portion and extends along the circumferential direction of the curl portion. The bead portion is formed by protrusion molding, and the tolerance of the protrusion molding height of the bead portion from the outer peripheral surface of the curl portion is smaller than the plate thickness tolerance of the curl portion.

In the method of manufacturing a bearing fitting according to the present invention, a curl portion having a predetermined outer diameter is formed by curving from a front surface side to a back surface side of the metal body in a flat plate-shaped metal body, and the inside of the curl portion is formed. In a method for manufacturing a bearing fitting in which a shaft is fitted so as to be rotatable relative to each other, before the curl portion is curved and formed, the metal fitting is formed at a predetermined curl portion forming portion of the fitting main body where the curl portion is curved and formed. A bead portion protruding from the front surface side to the back surface side of the main body and extending along the longitudinal direction of the curl portion molding planned portion is formed by protrusion molding. The protrusion molding height tolerance of the bead portion is smaller than the plate thickness tolerance of the curl portion to be molded.

[0008]

According to the present invention, a bead portion protruding inward is formed on a curl portion curvedly formed to a predetermined outer diameter with reference to the outer peripheral surface, and the bead portion from the outer peripheral surface of the curl portion is formed. By making the tolerance of the protrusion molding height smaller than the plate thickness tolerance of the curl portion, the dimensional accuracy of the inner diameter of the bead portion is increased, and the outer peripheral surface of the shaft is supported by the inner peripheral surface of the bead portion without rattling. .

Further, on the inner peripheral surface of the curl portion, the inner peripheral surface of the bead portion partially has a small diameter, which facilitates the work of inserting the shaft into the curl portion.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The present embodiment is an application example as a rod holder provided in a seat slide device of an automobile.

First, referring to FIG. 1, a seat slide device 1 is provided.
0 is provided with a lower rail 11 fixed on the floor surface in the vehicle and an upper rail 12 to which the bottom surface of the seat is fixed, and these are slidably fitted along their longitudinal direction. There is. On a side portion of the upper rail 12, a rod (shaft) 14 is provided with a rod holder (bearing metal fitting) 1 and a bracket 13 around the axis of the rod 14 as an arrow A ₁
And is rotatably supported in the A ₂ direction. Rod 14
A handle 15 is bent and formed at one end of the above, and a latch plate 16 is welded at the other end thereof. A plurality of lock holes 11 </ b> A that can be fitted to the tip (not shown) of the latch plate 16 are formed on the side portion of the lower rail 11 at equal intervals along the longitudinal direction of the lower rail 11. Then, normally, the rod 14 is rotated in the direction of the arrow A ₁ by the biasing force of the spring 17, and the tip of the latch plate 16 has a lock hole 11A facing it.
And the seats are locked by making both rails 11 and 12 immovable relative to each other. When adjusting the position of the seat, the handle 15 may be operated to rotate the rod 14 in the direction of the arrow A ₂ against the spring 17 to disengage the tip of the latch plate 16 from the lock hole 11A.

The rod holder 1 is manufactured by bending a metal plate as described later. As shown in FIGS. 2 to 4, the two side portions 1A and 1B have a substantially L-shaped cross section. The rivet 18 (see FIG. 1) that is bent into a shape and passes through the hole 1C formed in the one side portion 1A is fixed to the side portion of the upper rail 12,
The rod holder 1 is held on the side portion of the upper rail 12. At the tip of the other side portion 1B, there is a substantially C-shaped curl portion 1
D is curved and formed, and inside the curl portion 1D,
The rod 14 is rotatably fitted. Curl part 1D
Is curved and shaped with its outer peripheral surface as a reference so that its outer diameter D ₁ (see FIG. 5) has a predetermined dimension. The curve forming method will be described later. A bead portion 1E is formed on the inner peripheral surface of the curl portion 1D so as to project inward and extend along the circumferential direction thereof. In this example,
As shown in FIG. 5, the bead portion 1E is formed so as to project in a semi-circular cross section, and as shown in FIG. Is present.

In the bead portion 1E of the curl portion 1D, as shown in FIG. 5, the rod 14 has an inner peripheral surface having an arcuate cross section.
It becomes a sliding contact surface with the outer peripheral surface of and supports the rod 14 rotatably.

By the way, the tolerance of the protrusion molding height H (see FIG. 5) of the bead portion 1E from the outer peripheral surface of the curl portion 1D is smaller than the tolerance of the plate thickness T of the rod holder 1 (see FIG. 5). Has become. Therefore, the outer diameter D of the curl portion 1D
_When the curl portion 1D is curved and formed with the outer peripheral surface as a reference so that ₁ has a predetermined dimension, the inner diameter D ₂ (see FIG. 5) of the bead portion 1E is smaller than the tolerance of the plate thickness T. The tolerance of the height H is set with high accuracy.
For example, when the tolerance of the plate thickness T is ± 0.21 mm, the tolerance of the protrusion forming height H of the bead portion 1E is ± 0.05 mm, so that the inner diameter D ₂ of the bead portion 1E is smaller than that of the latter. It will be determined with a double tolerance of ± 0.10 mm. By the way, just like the above-mentioned conventional,
When the curl portion 1D is curved and the bead portion 1E is not formed, the inner diameter D _{3 of the} curl portion 1D
(See Fig. 5) is ± 0.4 which is twice the large tolerance of the former.
It is determined with a size tolerance of 2 mm, and its accuracy deteriorates, resulting in the problem described above.

[0015] Eventually, the rod holder 1, the inner peripheral surface of the bead portion 1E inner diameter D ₂ is determined with high accuracy, the rod 14
The outer peripheral surface of will be supported without play. Moreover,
On the inner peripheral surface of the curl portion 1D, since the inner peripheral surface of the bead portion 1E has a partially small diameter, the rod 14 can be easily inserted into the curl portion 1D, and the seat slide device 10 can be assembled. Workability is also improved.

Next, a method of manufacturing the rod holder 1 will be described (see FIGS. 6 and 7).

First, a flat plate-shaped metal body W having a rectangular plane shape as shown in FIG. 6A is prepared.

Next, as shown in FIG. 6B, a hole 1C and a bead portion 1E are formed in the main body W by projection. Bead part 1
E projects from the front surface W ₁ side of the main body W toward the back surface W ₂ side and extends along the longitudinal direction of the main body W. Further, the bead portion 1E is projected molded into the back surface W ₂ side surface W ₁ of the body W as a reference surface, the tolerances of the protruding forming height H (see FIG. 5), as described above, the thickness T (See Fig. 5). The hole 1C is formed by punching with a punch and a die, for example, and the bead portion 1E is formed by bending between the upper and lower molds, for example. These moldings may be performed simultaneously.

Next, as shown in FIG. 6 (c), the main body W is bent into a substantially L-shaped cross section to form two side portions 1A and 1B, and the tip of the other side portion 1B is formed. The portion is curved and formed on the back surface W ₂ side of the main body W. The tip portion of the side portion 1B is curved and formed with the same curvature as that of the curl portion 1D described later, and becomes the tip of the curl portion 1D. These moldings can be performed individually or simultaneously between the upper and lower molds, for example.

Next, as shown in FIG. 6 (d), the tip portion of the side portion 1B of the main body W is curved toward the back surface W _{2 of the} main body W to form a curl portion 1D. As described above, the curl portion 1D is curved and formed with the outer peripheral surface (the surface W _{1 of the} main body W) as a reference so that the outer diameter D ₁ (see FIG. 5) has a predetermined dimension. For the curved molding, for example, a lower mold 21 and an upper mold 22 as shown in FIG. 7 can be used. The lower die 21 includes a guide pin 23 that passes through the hole 1C, and the guide pin 23 positions and holds one side portion 1A on the upper surface of the lower die 21, as shown in FIG. On the other hand, a curved surface 22A is formed on the lower surface of the upper die 22. As the upper mold 22 descends, the front surface W _{1 of the} main body W slides on the curved surface 22A, so that the other side portion 1B is gradually curved with respect to the front surface W ₁ and the curl portion 1D. Will be formed.

By forming the curl portion 1D in this way, the rod holder 1 is completed.

[0022]

As described above, according to the present invention, a bead portion protruding inward is formed on a curl portion that is curved and formed to have a predetermined outer diameter with reference to the outer peripheral surface, and the curl portion is formed. The protrusion of the bead from the outer peripheral surface of the bead is smaller than the plate thickness tolerance of the curl, so the dimensional accuracy of the inner diameter of the bead is increased, and the inner peripheral surface of the bead causes the outer circumference of the shaft to The surface can be supported without play.

Moreover, since the inner peripheral surface of the bead portion has a small diameter on the inner peripheral surface of the curl portion, the shaft can be easily inserted into the curl portion.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat slide device including an embodiment of the present invention.

FIG. 2 is a side view of the rod holder shown in FIG.

FIG. 3 is a view on arrow III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along the line VV of FIG. 3;

6 (a), (b), (c) and (d) are shown in FIG.
FIG. 5 is an explanatory view of a manufacturing process of the rod holder shown in FIG.

FIG. 7 is a schematic side view showing an example of a molding die used in the molding stage of FIGS. 6C to 6D.

[Explanation of symbols]

1 Rod Holder (Bearing Metal Fitting) 1A, 1B Side 1C Hole 1D Curl 1E Bead 14 Rod (Shaft) T Plate Thickness H Projection Height D ₁ Outer Diameter W Mold Body W ₁ Front W ₂ Back

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Aihara 1-14-7 Maruyama, Isogo-ku, Yokohama, Kanagawa Oi Manufacturing Co., Ltd.

Claims (2)

(57) [Claims] 1. A curl portion having a predetermined outer diameter is formed on a flat metal body by curving from a front surface side to a back surface side of the metal body, and a shaft is relatively rotatable inside the curl portion. In the bearing fitting fitted to, a bead portion protruding inward of the curl portion and extending along the circumferential direction of the curl portion is formed on the inner peripheral surface of the curl portion by protrusion molding. The tolerance of the protrusion molding height of the bead portion from the outer peripheral surface of the bearing is smaller than the plate thickness tolerance of the curl portion. 2. A curl portion having a predetermined outer diameter is formed on a flat metal body by curving from the front surface side to the back surface side of the metal body, and the shaft is relatively rotatable inside the curl portion. In a method for manufacturing a bearing fitting that fits in, before curling the curl portion, from the front surface side to the back surface side of the fitting main body at the curl portion planned site of the fitting main body where the curl portion is curved A bead portion that protrudes and extends along the longitudinal direction of the portion where the curl portion is to be formed is formed by protrusion. When forming the bead portion by protrusion, the protrusion forming height of the bead portion from the surface side of the metal fitting body is adjusted. A method for manufacturing a bearing fitting, wherein the tolerance is made smaller than the plate thickness tolerance of the curl portion to be formed.