JPH0448983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a diaphragm actuator that displaces a drive rod fixed to a diaphragm by fluid pressure acting on the diaphragm. This invention relates to a method and apparatus for attaching a diaphragm actuator to a metal bracket when the diaphragm actuator is made of synthetic resin to reduce weight.

(Prior Art) A diaphragm actuator that displaces a drive rod fixed to a diaphragm by fluid pressure acting on the diaphragm is found, for example, in a diaphragm actuator for controlling idle rotation during the internal combustion period. Conventionally, it has been used in various fields.

In conventionally known diaphragm actuators,
Synthetic resins are increasingly being used as materials to reduce weight.

When a synthetic resin is used in this way, the strength of the synthetic resin is weak compared to the metal bracket that is the mounting member, so there is concern about the reliability of the mounting state.

Therefore, the reliability of the mounting state was improved by using a structure that partially uses metal.

Below, a conventionally known method and device for attaching a diaphragm actuator will be described.

In Fig. 5, one of the casings is a synthetic resin casing 1, the other is a metal casing 2, a screw 3 is fixed to the metal casing 2, and a metal bracket 4 for mounting is fixed to the screw 3. .

In FIG. 6, one of the casings is a synthetic resin casing 5, the other is a metal casing 6, and a metal bracket 7 for mounting is brazed to the metal casing 6.

In the known examples shown in Figures 5 and 6 above, only one side of the casing is made of synthetic resin, so the weight reduction of the device is insufficient compared to a case where the entire casing is made of synthetic resin. It was hot.

On the other hand, in the known example shown in Fig. 7, both casings are made of synthetic resin, which has a sufficient technical effect in terms of weight reduction, but on the other hand, it is disadvantageous in terms of mounting strength. It had become sufficient. That is, in FIG. 7, a metal fitting 9 is insert-molded into one of the synthetic resin casings 8. As shown in FIG. This mounting bracket 9
is attached to a bracket (not shown) or to a part to be fixed.

In the above-mentioned known synthetic resin diaphragm actuator, the mounting bracket 9 is insert molded, so there are restrictions on the shape of the mounting bracket 9 and the insert part of the mounting bracket 9, and a sufficient fixing state cannot always be obtained. Nakatsuta. In particular, there was a risk that the mounting fittings 9 would wobble due to the difference in thermal expansion between the synthetic resin and the metal, and there was also a problem in terms of reliability.

As an improvement on the method and apparatus for attaching each of the diaphragm actuators described above, it is also known that both casings 10 and 11 are made of synthetic resin and fixed with caulking metal fittings 12, as shown in FIG. In this known device, the caulking metal fitting 12 is clamped and held by elastic clamps 13.

However, even this known method has problems in terms of vibration resistance because it is held using a clamp.
In addition, the casing may rotate within the clamp due to vibration, which may cause damage to the tube, malfunction, or interference with other equipment.

(Problems to be Solved by the Invention) As mentioned above, conventionally known diaphragm actuators that are partially made of synthetic resin for weight reduction have insufficient weight reduction effects, and are made entirely of synthetic resin. There are installation problems with the
This resulted in a decrease in reliability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and apparatus for attaching a diaphragm actuator, in which the entire casing is made of synthetic resin, and at the same time, reliability during attachment is improved.

(Means for Solving the Problems) The feature of the present invention is that a caulking metal fitting is fixed to the bracket in advance, and the flange of the synthetic resin casing is caulked with this caulking metal fitting.

As a result, the casing and the bracket are integrated and securely fixed, improving the reliability of the mounting state of the diaphragm actuator.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing one embodiment of the diaphragm actuator of the present invention, and FIG. 2 is a sectional view of the diaphragm actuator of FIG. 1.

One casing 21 is made of synthetic resin, and the other casing 22 is also made of synthetic resin. Flanges 23 and 24 are formed on the outer periphery of the open end portions of both casings 21 and 22, and the diaphragm 25 is attached to these flanges 23 and 24.
Its outer peripheral edge is held by 24. A thick portion 26 is formed on the outer peripheral edge of the diaphragm 25, and the flanges 23 and 24 sandwich this thick portion so as to compress it. Casing 21
is provided with a port 27 for introducing negative pressure, a drive rod 28 is fixed to the diaphragm 25, and a guide 29 on which the drive rod 28 slides is provided in the casing 22. A working chamber 30 is defined by the diaphragm 25 and the casing 21,
An intake passage of an internal combustion engine (not shown) and the working chamber 30 are connected. The metal bracket 31 holds the diaphragm actuator and fixes it in a predetermined position, and has the following configuration.

The bracket 31 is provided with a hole 32 into which the casing 22 is inserted.
A metal caulking member 33 is fixed by welding or brazing. The caulking member 33 has an annular joint 33A joined to the bracket 31.
and a cylindrical tube portion 33B, which is a ring-shaped member, and a plurality of protrusions 33C that protrude inward are partially formed at the end of the tube portion 33B. By this protrusion 33C, both flanges 23, 2
4 is caulked. The bracket 31 is fixed at an appropriate location within the engine room.

A method of attaching the diaphragm actuator of the present invention configured as described above will be explained.

First, the joint portion 33A of the caulking member 33 is fixed to the bracket 31 by welding or brazing. Since this fixing work involves heat,
Although it is impossible to perform welding or brazing after the caulking member 33 caulks and holds the synthetic resin diaphragm actuator, in the present invention, the caulking member 33 is attached before caulking the synthetic resin diaphragm actuator. 33 is fixed by welding or brazing, the synthetic resin diaphragm actuator will not be damaged by heat.

Next, insert the casing 2 into the hole 32 of the bracket 31.
2, and then insert the cylindrical portion 33 of the caulking member 33.
B is caulked inward to form a protrusion 33C, and both flanges 23 and 24 are caulked.

As described above, even if the diaphragm actuator according to the present invention is entirely made of synthetic resin, there will be no problem when fastening it, and reliable holding will be possible.

The shape of the protrusion 33C is not limited to the illustrated embodiment; for example, a waveform may be formed at the end of the cylindrical portion 33B, and only a portion of this waveform may be bent. It also includes a serrated structure.

3 and 4 show other embodiments of the present invention.

In this embodiment, the caulking member 34 is welded or brazed to the bracket 35 at a joint 34A.
and an upwardly rising portion 34B. Both flanges 23 and 24 are caulked by this rising portion 34B.
The number of caulking members 34 is arbitrarily adopted.

(Effects of the Invention) The diaphragm actuator of the present invention configured and attached as described above provides the following technical effects.

Since the entire casing is made of synthetic resin, the weight can be further reduced compared to the conventional case in which part of the casing is made of synthetic resin.

In addition, the conventional partially resin-based structure requires screws, spacers, etc. to connect the metal casing and the bracket, increasing the number of parts, whereas the present invention's fully resin-based structure In the casing, the number of parts can be reduced, making parts management easier and reducing costs.

By performing the welding or brazing process before the caulking process, thermal damage to the synthetic resin casing during the welding or brazing process can be prevented, reducing equipment reliability despite the presence of the hot process. There is no.

Since the diaphragm actuator and the bracket are securely attached, the diaphragm actuator does not fall off or come loose, improving the reliability of the diaphragm actuator.

The difference in thermal expansion between the synthetic resin casing and the metal bracket or the metal caulking member can be sufficiently absorbed by compressing and setting the thick part of the diaphragm, and problems due to the difference in thermal expansion do not occur.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the diaphragm actuator of the present invention, and FIG. 2 is a sectional view of the diaphragm actuator of FIG. 1.
FIG. 3 is a front view showing another embodiment of the diaphragm actuator of the present invention, and FIG. 4 is a sectional view of the diaphragm actuator of FIG. 3.
FIG. 5 is a cross-sectional view of a conventionally known diaphragm actuator partially made of synthetic resin, and FIG. 6 is a cross-sectional view of another conventionally known diaphragm actuator partially made of synthetic resin. FIG. 7 is a sectional view showing a conventionally known diaphragm actuator made entirely of synthetic resin, and FIG. 8 is a sectional view showing another diaphragm actuator made entirely of synthetic resin. 21, 22... Casing, 23, 24... Flange, 25... Diaphragm, 26... Thick part, 27... Port, 28... Drive rod, 29
... Guide, 30 ... Working chamber, 31 ... Bracket, 31, 32 ... Hole, 33 ... Caulking member, 3
3A...Joint part, 33B...Cylinder part, 33C...Protrusion, 34...Caulking member, 34A...Joint part, 3
4B... Rising part, 35... Bracket.

Claims (1)

[Scope of Claims] 1. One casing made of synthetic resin, the other casing also made of synthetic resin, flanges formed on the outer peripheries of open end portions of both casings, and flanges of both casings. a diaphragm whose outer periphery is clamped; a working chamber defined by either the diaphragm and the casing; and a fluid pressure fixed to the diaphragm and communicated with the working chamber. In a method in which a diaphragm actuator consisting of a drive rod that is displaced by a metal bracket is held by a metal bracket, a metal caulking member is welded or brazed to the bracket, and the inner part of the casing is inserted into the hole of the bracket. A method for attaching a diaphragm actuator, characterized in that after inserting either one of the flanges, both flanges are caulked using the caulking member. 2. A patent claim characterized in that the caulking member is a ring member consisting of a joint portion and a cylindrical portion, and both flanges are caulked by a projection partially formed at the end of the cylindrical portion. A method for attaching a diaphragm actuator according to item 1. 3. Claims characterized in that the caulking member is comprised of a claw member consisting of a joint portion and a rising portion that partially protrudes from the bracket, and the two flanges are caulked by the rising portion. A method for attaching the diaphragm actuator according to item 1. 4. One casing made of synthetic resin, the other casing also made of synthetic resin, flanges formed on the outer peripheries of the openings of both casings, and the outer periphery thereof held by the flanges of both casings. a diaphragm; a working chamber defined by one of the diaphragm and the casing; and a drive rod fixed to the diaphragm and displaced by fluid pressure communicated with the working chamber. A device for holding the diaphragm actuator in a metal bracket, comprising: a hole formed in the bracket into which one of the casings is inserted; A mounting device for a diaphragm actuator, comprising a metal caulking member welded or brazed to the diaphragm actuator, and both flanges are caulked by the caulking member. 5. A patent claim characterized in that the caulking member is a ring member consisting of a joint portion and a cylindrical portion, and both flanges are caulked by a projection partially formed at the end of the cylindrical portion. A mounting device for a diaphragm actuator according to item 4. 6. Claims characterized in that the caulking member is comprised of a pawl member consisting of a joint portion partially protruding from the bracket and a rising portion, and the two flanges are caulked by the rising portion. 5. The diaphragm actuator mounting device according to item 4.