JPH0825405A - Molding bush for resin molding - Google Patents

Abstract

PURPOSE:To obtain the dimensional accuracy of an inner diameter of a bush without releasing and without rotating even when the punching accuracy of a plate material is low by forming uneven parts formed on both end sides of the material at a gap at the end sides of its winding direction, inserting the bush, and intervening resin in the gap at the time of resin molding. CONSTITUTION:A mounting bush 10 is formed of a metal plate material. Uneven parts 11, 12a, 11a, 12a are respectively so formed at both left and right end sides as to be engaged with each other at the time of winding the bush 10 and formed in a hollow cylindrical state. The parts 11, 12, 11a, 12a are overlapped at a contact surface 13 in a vertical direction, and a gap 14 is formed at the end side of a winding direction. The size of the inner diameter can be accurately regulated by its springness. Since resin is cast in the gap 14 at the time of molding, it becomes a release-lock in the vertical direction and a rotation-lock in a mounting hole 3. When a bolt is clamped in the bush 10, its clamping force is rigidly received by the surface 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush for an insert of a resin molded product, and more particularly to a resin mold type motor for controlling intake timing of a vehicle engine, and a resin mold for a resin pump case of a water pump motor device for heating a vehicle. The present invention relates to a mounting bush for a resin molded product, which is preferably used for all resin parts assembled by inserting bolts into mounting bolt through holes of a motor and a resin cover.

[0002]

2. Description of the Related Art Conventionally, when a resin molded product is fixed by screwing or crimping, if the resin is directly fixed, creep occurs. Therefore, a bush is generally inserted to mold the resin molded product, and the creep of the resin molded product, etc. Is being prevented. This type of bush is required to have the basic performance of not crushing, falling out, and turning due to bolt tightening force.
It has a structure that prevents it from turning or coming off. For example, the one used in a water pump for a bath is a bush-shaped one that is cut from a brass rod and has a mesh knurled outer peripheral surface.
As described above, when the outer peripheral surface is subjected to the mesh knurling, there is a problem that the number of processing steps increases and the manufacturing cost increases.

In order to solve this problem, there has been proposed a bush of a resin molded product which is formed by curling a plate material and has at least one groove on its outer peripheral surface (Actual Publication No. Sho 62-4).
(See Japanese Patent No. 5886).

[0004]

In the above-mentioned proposed technique, since the groove is formed on the outer peripheral surface, a man-hour for processing the groove on the outer peripheral surface is required. In addition, it is necessary to make the gap between the seams at both ends when curling the plate material zero, so curling (rolling)
There is a problem that dimensional accuracy at the time of punching is required to secure the inner diameter dimension afterward.

The object of the present invention is to ensure the required performance of a metal bush for reinforcing a bolt hole to be resin-molded by resin molding, that is, the performance of not being crushed by bolt tightening force, not coming off, and not turning. At the same time, it is an object of the present invention to provide a mounting bush for a resin molded product, which can be easily manufactured by press punching and bending, and can obtain inner diameter dimensional accuracy even if dimensional accuracy by press punching is poor.

[0006]

A mounting bush for a resin molded product according to the present invention is a hollow mounting bush integrally molded with a resin molded product for fixing the resin molded product. Is a metal plate with uneven parts that mesh with each other on the left and right sides, and the uneven parts are overlapped in the vertical direction, and the uneven parts are formed with a gap on the leading end side in the winding direction when wound. When the bush is inserted and resin molding is performed, resin is interposed in the gap to be integrally molded.

[0007]

The mounting bush of the resin molded product of the present invention is such that when the uneven portions of the metal plate member provided with the uneven portions which engage with each other on the left and right sides are overlapped in the vertical direction, the uneven portions are wound. Since it is formed with a gap on the leading end side in the winding direction, the resin is interposed in the gap and is integrally molded when the mounting bush is inserted and the resin is molded. By thus flowing the resin into the gap, it serves as a detent as well as a retainer.

Further, since the bolt tightening force is received vertically at the contact surface in the vertical direction at the overlapping position of the uneven portion,
Does not deform with the tightening force of the bolt. Since the gap is formed on the tip side of the uneven portion when the plate material is wound, the spring property of the metal plate material can be utilized to adjust the inner diameter dimension during resin molding. That is, when the plate material is wound and formed, the finished inner diameter should be slightly smaller than the final inner diameter, and at the time of molding, it should match the outer diameter of the insert mold pin that is inserted into the inner diameter of the resin product. Therefore, even if the punching accuracy of the plate material is poor, the inner diameter dimension accuracy of the mounting bush can be obtained by the outer diameter dimension of the insert die pin.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 is a perspective view showing an example of using a bush for mounting a resin molded product in a resin mold type motor, and FIG. 1
3 is a cross-sectional view taken along line AA of FIG. 3, FIG. 3 is a perspective view of a mounting bush of a resin molded product, FIG. 4 is a plan view showing a developed shape before winding processing of FIG. 3, and FIG. 5 is a metal mounting body provided with a mounting female screw. FIG. 6 is a side view including a partial cross-section showing a state in which the motor is attached with bolts, and FIG. 6 is a cross-sectional view showing the bolt attachment portion of FIG.

In this example, a resin mold type motor M will be described as an example of the resin molded product. In the resin mold type motor M of this example, as shown in FIG. 1, a mounting flange 2 is formed on one end side of a resin casing 1.
A mounting hole 3 is formed in the mounting hole 3, and a mounting bush 10 (10a, 10b, 10c) is insert-molded in the mounting hole 3. The mounting bush 10 is integrally molded to fix the resin mold type motor M, which is a resin molded product, and has a hollow cylindrical shape. In addition, in FIG.
Reference numeral 4 is an output shaft of the motor M.

The mounting bush 10 of this embodiment is formed of a metal plate material, and as shown in FIG. 4, the concave and convex portions 1 are formed on the left and right ends in the winding direction from the center to the upper and lower sides.
1, 12, 11a, 12a are formed so that when the mounting bush 10 is wound and formed, they mesh with each other. That is, the plate material is wound to form the hollow cylindrical mounting bush 10, and at this time, the uneven portions 11, 1 at the central position in the winding direction of the mounting bush 10 are formed.
2, 11a, 12a overlap in the contact surface 13 in the vertical direction, and the uneven portions 11, 12, 11
A gap 14 is formed on the leading end side of the windings a and 12a in the winding direction.

Molding using the above-mentioned mounting bush 10 can be carried out as follows. That is, first, a plate material such as SPCC (cold-rolled steel plate) is punched by a punching press die (not shown). As described above, this punching has uneven portions 11 and 12 that mesh with each other on the left and right ends in the winding direction. , 11a, 12a are continuously punched in advance by a punching press die.

Next, the punched plate material is wound by a bending die (not shown) to form the mounting bush 10.
At this time, the uneven portions 11, 12, 11a, 12a are formed with a gap 14 on the leading end side in the winding direction when wound. Therefore, by using a bending die, the finished inner diameter is wound slightly smaller than the final inner diameter, and at the time of molding, it is put into the mounting hole (that is, inner diameter portion which is an insert portion) 3 of the resin mold type motor M which is a resin product, and molding is performed. . At this time, the wound mounting bush 10 can be fixed to the protruding pin (not shown) of the mold that serves as the insert portion, and the outer diameter of the protruding pin can be adjusted. In this way, when the plate material is wound, since the gap 14 is formed on the tip end side of the concavo-convex portions 11, 12, 11a, 12a in the winding direction, the spring property of the metal plate material is utilized, and the inner diameter is used at the time of resin molding. The dimensions can be adjusted, and thus, even when the punching precision of the plate material is poor, the precision of the inner diameter of the mounting bush 10 can be obtained.

Further, the resin flows into the gap 14 formed when the concavo-convex portions 11, 12, 11a and 12a are wound, so that the resin can be prevented from coming off in the vertical direction (FIG. 2) and at the same time the inside of the mounting hole 3 can be prevented. It becomes a detent in. Further, as shown in FIGS. 5 and 6, when the resin molded motor M is mounted on the mounting body (for example, made of metal) 6 by using the bolt 5, the bolt 5 is mounted and fastened in the mounting bush 10. , The contact surface 13 of the concavo-convex portions 11, 12, 11a, 12a at the vertically overlapping positions receives the tightening force of the bolt 5 vertically, so that the mounting can be performed firmly without being deformed by the tightening force of the bolt 5. It will be possible.

7 and 8 show another embodiment according to the present invention. FIG. 7 shows a bush 1 for mounting a resin molded product.
0 is a perspective view, and FIG. 8 is a plan view showing a developed shape before the winding process in FIG. 7. In the present example, parts that perform the same operations as those of the above-described example are assigned the same reference numerals and explanations thereof are omitted.

In the above embodiment, the left and right concavo-convex portions 11, 1
Although the contact surfaces 2, 11a, 12a are in contact with each other at the upper and lower positions, in this example, as shown in FIG. 8, the central protrusion 16 is formed on one of the left and right ends in the winding direction. On the other hand, a recess 17 that engages with the central projection 16 is formed. Then, when wound, as shown in FIG.
6 and the recess 17 are engaged with each other to form the mounting bush 10. Also in this example, a gap 14 is formed at the tip end in the winding direction. Therefore, it is possible to obtain the same effect as that of the above-mentioned embodiment. In this example, the gaps 14 are formed at three places, so that the gap 14 is more easily integrated with the resin casing 1, and the retaining strength and the retaining strength against the tightening of the bolt 5 are increased.

[0018]

As described above, according to the present invention, the concavo-convex portions of the metal plate having the concavo-convex portions on both left and right sides which are meshed with each other are overlapped in the vertical direction and the concavo-convex portion is wound. Since it is formed with a gap on the front end side in the winding direction, when the mounting bush is inserted and the resin is molded, the resin is interposed in the gap and is integrally molded. For this reason, when the resin flows in, it serves as a detent as well as a retainer. Further, the vertical contact surface at the overlapping position of the uneven portion receives the bolt tightening force vertically, so that it is not deformed by the bolt tightening force.

Further, when the plate material is wound, a gap is formed on the tip end side of the concavo-convex portion in the winding direction, so that the springiness of the metal plate material can be utilized to adjust the inner diameter dimension during resin molding. That is, when the plate material is wound and formed, the finished inner diameter should be slightly smaller than the final inner diameter, and at the time of molding, it should match the outer diameter of the insert mold pin that is inserted into the inner diameter of the resin product. Therefore, even if the punching accuracy of the plate material is poor, the inner diameter dimension accuracy of the mounting bush can be obtained by the outer diameter dimension of the insert die pin.

As described above, according to the present invention, the resin-molded resin-molded bush for reinforcing bolt holes for metal attachment does not have to be crushed by the tightening force of the bolt and does not come off. It is possible to provide a bush for mounting a resin molded product that can be easily manufactured by press punching and bending while ensuring the performance that it does not rotate and that can obtain inner diameter dimensional accuracy even if the dimensional accuracy by press punching is poor. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of using a mounting bush of a resin molded product according to the present invention for a resin mold type motor.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of a mounting bush of a resin molded product according to the present invention.

FIG. 4 is a plan view showing a developed shape of FIG. 3 before winding.

FIG. 5 is a side view including a partial cross section showing a state in which a motor is attached to a metal attachment body having an attachment female screw by bolts.

FIG. 6 is a cross-sectional view showing a bolt mounting portion of FIG.

FIG. 7 is a perspective view of a mounting bush of a resin molded product showing another embodiment.

FIG. 8 is a plan view showing a developed shape before the winding process in FIG. 7.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin casing 2 Flange 3 Mounting hole 4 Output shaft 5 Bolt 6 Mounting body 10 (10a, 10b, 10c) Mounting bush 11, 12 Convex portion 11a, 12a Concave 13 Contact surface 14 Gap 16 Center protrusion 17 Recess M Resin mold type motor

Claims (1)

[Claims] 1. A hollow mounting bush integrally formed with a resin molded product for fixing the resin molded product, wherein the bush is made of metal and is provided with concavo-convex portions on both left and right end sides. The uneven portions of the plate material are overlapped in the vertical direction, and the uneven portions are formed with a gap on the leading end side in the winding direction when wound, and when the bush is inserted and resin molding is performed, the resin is not filled in the gap. A bush for mounting a resin molded product, characterized by being interposed and integrally molded.