JPS59133014A - Structure of connection of resin and metal parts - Google Patents

Abstract

PURPOSE:To fusion-solidify resin and metal parts by employing induction heating for solidifying the metal part enclosed with the resin part in such a manner as to allow the heat to be generated only on the surface thereof. CONSTITUTION:A fusion accelerating portion 12 comprising, for instance, apertures, grooves and projections is provided in a portion where conductive metal and thermoplastic parts are joined together, wherease the metal part is combined with the resin one in such a way that the former is enclosed with the latter. The combination of both parts is passed through an induction magnetic field to fusion-sodify them by induction heating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is inspired by the combination fA structure of resin parts and metal parts,
A conductive metal part is surrounded by a thermally plastic resin part, which is then bath-fused and fixed by induction heating.

An example of a device having a structure in which a metal component is surrounded by a resin component is a parking brake device for an automobile as shown in FIG.

f, f, grip (2) on the brake lever (1)
A part to fix the release button (4) to the release bond (3), a part to fix the protector (7) to the outer tube (6) of the flexible cable (5), a part to fix the protector (7) to the outer tube (6) of the flexible cable (5), It has a structure such as a part where the end (9]) of the waterproof boot (9) is fitted onto the inner cable (8) of 5).

Conventionally, when a resin part and a metal part are fixed to each other in a portion having the above structure, fixing means such as crushing, screwing, adhesion, etc. have been used.

However, with such conventional structures, press-fitting takes time and effort, and the resin parts expand depending on the temperature conditions during use, so there is a risk of loosening unless the resin parts are press-fitted very tightly. It is also difficult to maintain the integrity of the fit, and with screws, the screwing process is time-consuming, and if measures are not taken to prevent rotation, there is a risk of the mating being reversed due to vibration, etc., loosening or coming off. However, there are problems in that the adhesive application process is time-consuming and the adhesive costs a lot of money.On the other hand, since the heat-flexible resin part melts in a bath when heated, it is difficult to heat the metal parts. I would like to solidify the joining area with a bath melt, but in the structure described above, the metal parts are surrounded by resin parts, so if I heat them from the outside, there is a risk of damaging the resin parts, so I do not want to heat only the metal parts. Depending on the structure, it may be possible to assemble resin parts after doing so, but this requires special ingenuity in positioning and other jigs, and it is not possible to combine resin parts such as the above-mentioned parking brake system, which is completed by assembling a large number of parts. There were problems in that there were many constraints on the process, the degree of freedom in process organization was lost, and rationalization became difficult.

By the way, as shown in FIGS. 2 to 4, an induction heating method is generally known in which metal is heated by placing it in an induced magnetic field, and the principle thereof will be explained with reference to FIGS. 2 and 3.
When an induction coil (B) is wound around a conductive metal heated object (A) and an alternating current is passed through it, an induced magnetic field as shown in the broken line in Figure 2 is generated, and as a result, as shown in Figure 3. An induced current (C) flows on the surface of the object to be heated (Al), generating Zeel heat. The higher the frequency of the alternating current, the closer the induced current (C) is to the bottom surface, and the lower the frequency, the deeper the induced current (C) is generated.

Further, more heat is generated in magnetic metals such as iron and nickel chromium than in non-magnetic metals and metals such as silver, copper, and aluminum. An example of an induction heating device is shown in FIG. 4, where coils (D 1), (D I
) is fixedly installed.1. A workpiece supply table (D2) is provided between them, and the coils (Di) and (Di) are integrally passed through an induced current to generate an induced current. , power is supplied from another power generation device.

The present invention has been made by focusing on the above-mentioned conventional problems, and uses induction heating to generate heat only on the surface of metal parts, and has a configuration in which heat is effectively generated between resin parts and metal parts. The object of the present invention is to solve the above-mentioned gap-melting point problem by providing a resin part and a metal part so that they can be melted and fixed after being combined.

In order to achieve this object, in the present invention, a melting promotion part is provided at the joint portion of the metal part and the resin part, and the combined parts are passed through an induced magnetic field and melted and fixed by induction heating.

Hereinafter, various embodiments of the present invention will be described based on the drawings. Note that similar parts in each embodiment are designated by the same reference numerals, and redundant explanation will be omitted.

5 and 6 show a first embodiment of the present invention, in which a grip (2), which is a thermoplastic resin part, is attached to a brake lever (1), which is a conductive metal part.

In the past, it was common to use press-fitting or adhesive to fix the external fitting, but in the case of press-fitting, dimensional accuracy is required for singing, and if the press-fitting is too strong, the grip (2) will break, and if it is too weak, it will fall out. Even if it does not break during assembly, it may crack or change shape due to residual stress, and press-fitting is not easy, and in the case of gluing, pretreatment such as degreasing and cleaning is required before applying the adhesive to prevent it from protruding. The workability is very poor, as it is necessary to control the amount applied and the time it is allowed to stand in order to obtain adhesive strength, and in addition, it is necessary to select an adhesive that is compatible with the material of Glisive (2). There are many problems, such as the need to store and manage the adhesive itself in a stable environment, which can be extremely expensive in some cases. It is.

A grip (2) made of thermoplastic resin made of a slightly soft material such as vinyl chloride, urethane, or foamed material is fitted onto the end circle of the brake lever (1) made of conductive metal. The fitting hole (2υ) of the grip (2) is adapted to be lightly press-fitted into the end circle of the brake lever (1).

The end circle of the brake lever (1) has two through holes U21. ttz+ is drilled.

To attach the grip (2) to the brake lever (1), the grip (2) is fitted onto the end circle of the brake lever (1) and positioned, and then both parts are heated with an induction heating device. . The operating current of the induction heating device uses a high frequency. Then, the surface of the end circle of the brake lever (1) is locally heated, and the through hole u21. The area near u21 is particularly strongly heated to promote melting. When both parts are subjected to an induction heating device for a predetermined period of time, the inner surface of the fitting hole round of the grip (2) that is in contact with the end round melts, and as shown in FIG. melts and fits in, and when it cools down, the grip knob (2) is attached to the end α of the brake lever (1).
It is firmly fixed to υ.

In this way, the surface side of the brake lever (1) is locally heated by induction heating to melt and fix the grip (2), so it is usually difficult to heat the brake lever (1) from inside. You can get the same results as if you were heating it from the inside.

Moreover, even if other parts are present inside the brake lever (1), they are heated without any adverse effects.

In addition, if a part of the outer periphery of the through hole a is removed, the fixation can be made more securely.

7 to 9 show a second embodiment, in which a split groove (13
), and a widened part u4λI is provided in a part thereof, and the grip (2) has a protrusion (2) that fits into the groove (13). The Uυ should be lightly press-fitted, or the protrusions should be press-fitted into the grooves (13).

The procedure for assembling the grip (2) is the same as in the first embodiment, but as shown in FIGS. 8 and 9, the protrusions (near the two ridges are melted and welded to the split grooves (13). (
2) into the end of the brake lever (1), the protrusion (2 ribs) will fit into the split groove (13), so the grip (2)
It has the advantage that it does not get twisted and attached.

Figure 10 shows the third embodiment, in which the brake lever (
1) has a knurling (I) on the end (11) as a melting promotion part.
5) is formed on the outer periphery, and a grip (
In 2), the inner surfaces of the mating mating members are melted and fixed to mesh with each other.

11 and 12 show a fourth embodiment, in which a ring-shaped groove (16) is formed as a melting promotion part in the end (11) of the brake lever (1). As shown, the resin melts and flows into the groove (16) and is fused and fixed so that the grip (2) does not come off.

13 to 15 show a fifth embodiment, in which a protrusion (I7) is formed on the end circle of the brake lever (1) as a melting promotion part.
) with a protrusion (L), as shown in Figure 14.
When the fitting hole (21) of the grip (2) rides on the grip (2J
It was designed so that it would penetrate into the body.

16 to 18 show a sixth embodiment, in which a protrusion C is formed as a melting promotion part on the inner surface of the fitting hole Cυ of the grip (2).
1! □□□ is formed, and as shown in Fig. 17, when the grip (2) is temporarily fixed, the protrusion (23) is attached to the end a1.
), but when melted, as shown in FIG. 18, the protrusions and striations (C) are melted in the bath and spread out, increasing the adhesion.

Figures 19 to 21 show a seventh embodiment, in which the end (11) of the brake lever (1) is cut in the direction in which the grip (2) is hooked relative to the direction in which the grip (2) is pulled out. Starting α
As shown in Fig. 20, when the grip (2) is inserted into the end 0υ, the inner surface of the fitting hole (21) is cut out and it rides on the lll0 and is temporarily fixed so that it does not come off. When the grip (2) is melted in a bath, as shown in FIG. 21, the cut and raised stakes bite into the inner surface of the fitting element μ21), thereby firmly fixing the grip (2).

Note that the melting promoting parts in each of the above embodiments may be used in combination.

FIG. 22 shows the eighth embodiment, in which the release rod (
3) shows the case where the release button (4) is fixed.

Conventionally, when fixing the release button (4), the end C31) of the release rod (3) is integrally molded with resin to form the shape of the release button (4), or the end C31) of the release rod (3) is molded integrally with resin. ) to the bolt and release button (4)
Previously, a female screw hole was formed and screwed into the release button (4), but with the one that is integrally molded with resin, a mold is required to create the outer shape of the release button (4), and the release rod (3) can be integrally molded according to the length and other specifications. Many types of equipment and molds are required, the equipment and processes become complicated, and the mold structure becomes complicated due to the integral molding of the center, which creates cavities and shapes, resulting in cost and technical problems. There are many problems with the screw-in type: the end of the release rod (3) (3) and the release button (4) must be threaded, and in addition, the release button (4) tends to loosen, so It required a double nut structure to prevent loosening, and it was troublesome to have to rotate the IJ-IJ-spot button (4) when installing and moving it around. Moreover, when the length of the release rod (3) is set in various ways, it is troublesome to manage it.

Therefore, in this embodiment, the end of the release rod (3) (
31) to form a circumferential groove (3 grooves) as a melting promotion part, and attach a separately molded resin IJ button (4) to the end (
311 and then melted and fixed by induction heating.

According to this embodiment, the release button (4) is securely fixed and there is no risk of loosening unlike when it is screwed.
Moreover, the release button (4) can be connected to the release rod (3).
), no mold jig is required, the installation is easy, and the release button (4) and release rod (3) are easy to install.
) and can be set separately (4)
If there is a difference in specifications due to the combination of the release rod (3) and the release rod (3), this can be easily managed and is effective in terms of parts management.

FIG. 23 shows a ninth embodiment, in which a flexible cable (5
) shows the case where the protector (7) is fixed to the outer cylinder (6).

Conventionally, in order to secure the protector (force), there have been cases of adhesion and cases of caulking from the outside of the protector (7) with another caulking ring. It has the same disadvantages as crimping, which requires a separate crimping ring and requires a long flexible cable (5.
), it took a considerable amount of effort and man-hours to fit the caulking ring to the part to be caulked, move it to the area to be caulked, and caulk it.

Therefore, in this embodiment, it was decided to melt and fix the protector by induction heating.

The outer cylinder (6) of the flexible cable (5) is a main cylinder (6υ) made by spirally winding a band-shaped metal and coated with resin liquid rjt (
li2) is covered. Although there may be no resin coating (621), if this outer cylinder (6) is sheathed with a cylindrical protector (force), the protector (force is resin liquid 'IL (62
) will surround the main cylinder (Gυ), and the protector (7), which is a resin part, will be indirectly joined to the main cylinder (61), which is a metal part.Since the main cylinder (6υ) is spiral-shaped, , the boundary grooves of each strip of metal naturally serve as melting accelerators.

When the protector (7) is placed on the outer cylinder (6) and then heated by induction, the surface side of the main cylinder (6υ) generates heat, which causes the resin coating (621) to melt, and then the inner peripheral surface of the protector (7) to melt. Resin coating f62) ,,!: Nibrotifta 7
) is melted and fixed to main pipe town).

Next, a tenth embodiment will be described with reference to FIG.

In other words, this is a case where the end (9υ) of the waterproof clip 9) is fixed to the inner cable (8) of the flexible cable (5).

The waterproof boot (9) has a main body formed of a bellows (92),
Even if the end (91j) is in sync with the movement of the inner cable (8), the bellows (9)
2) can absorb the displacement, and the other end shaft is fitted into the end fitting (631) of the outer cylinder (6).

Conventionally, when fixing the end (9υ) of the waterproof boot (9) to the inner rope (8), the fit was done with elastic force or caulked with a cinch ring, but However, since the inner cable (8) is usually a bundle of thin steel wires, unevenness is created between the steel wires adjacent to the surface, and water easily enters between them. As mentioned above, the workability was poor and there was a risk of damaging the inner cable (8).

Therefore, in this embodiment, the inner cable (8) and the waterproof boots (9) are
) and the end (9]) are melted and fixed by induction heating, and the unevenness between the /1II4 wires naturally forms a melting promotion part.

According to this embodiment, since the end portion (9υ) of the waterproof boot (9) melts, it flows into the unevenness on the surface of the inner cable (8) and closes it, making it extremely effectively watertight. There is no risk of damaging the inner cable (8), and the workability is good.

In the joint structure of the resin part and metal part according to the present invention, only the surface side of the metal part is heated by induction heating to melt and fix the parts on the surface of the joint part, and the part to be joined is heated by induction heating. Since processing can be performed without direct contact, even when a metal part is surrounded by a resin part, it can be easily processed, and furthermore, the joint part automatically conforms to the shape by melting. Further, it is possible to process without adversely affecting the internal structure, and the connection is ensured, the processing workability is improved, and the degree of freedom in process organization is increased.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an automobile brake system, Figs. 2 and 3 are diagrams explaining the principle of induction heating, and Fig. 4 is a front view showing an example of an induction heating device. , FIG. 5 and FIG. 6 show an embodiment of the present invention, showing the attachment relationship between the brake lever and the grip, FIG. 5 is an exploded perspective view, FIG. 6 is a partial vertical sectional view, and FIGS. FIG. 21 similarly shows an embodiment related to the attachment relationship between the brake and the grip, FIGS. 7 to 9 show the g2 embodiment, FIG. 7 is an exploded perspective view, and FIG. 8 is an exploded perspective view. FIG. 9 is a cross-sectional view of the bonded state before melting, FIG. 10 is an exploded perspective view of the third embodiment of 6J, FIG. FIG. 12 is an exploded perspective view, FIG. 12 is a partial cross-sectional view, FIGS. 13 to 15 show the fifth embodiment, FIG. 13 is an exploded perspective view, and FIG. Similarly, FIG. 15 shows the example after bath melting, FIG. 16 to FIG. 18 show the sixth center example, FIG. 16 is an exploded perspective view, and FIG. Figure 18 similarly shows the example after bath melting, Figures 19 to 21 show an example of the 7th center, Figure 19 is an exploded perspective view, East Figure 20 is a partial continuation of Sho 1 before melting, and Figure 21 The figure also shows the second phase after bath melting.
Figure 2 shows the release rod and IJ I.
FIG. 23 is a partially cutaway front view showing the fixed state with the J-spot tongue, and FIG. 23 shows the ninth embodiment, and is a partial vertical sectional view of the fixed state between the protector and the flexible cable. (1)...Brake lever (2)...Grip (3)...Release rod (4)...Release button (5)...Flexible cable (6)
...Outer cylinder (force...protector (8)...
Inner cable (9)...Waterproof boots Aki 2

Claims (1)

[Claims] This is a joining structure of a thermoplastic resin part and a conductive metal part surrounded by the resin part, in which a melting promoting part is provided at the joint part of the metal part and the resin part, and the combined parts are guided ( A bonding structure of a resin part and a metal part, which is characterized by being melted and fixed by passing through the water and being heated by induction.