JPH0332805Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a diaphragm actuator.

<Prior Art> Conventionally, diaphragm actuators have been widely used as actuators for control devices in automobiles, which provide reciprocating motion to a rod connected to a diaphragm using the suction force of negative intake pressure, for example. A round steel bar with a circular cross section is used as the rod of this type of actuator, and is fixed by caulking to the center of a diaphragm made of an elastomer material via a metal plate retainer. The rod protrudes from an insertion hole drilled in the center of the cover, which protects the diaphragm and functions as a rod extension stopper by colliding with the diaphragm's retainer, and this hole has a relatively large clearance. He is accepting rods loosely.

When caulking the rod member and the diaphragm, fixation and positioning are performed using a connecting hole with another link member, which is drilled in the working end of the rod member.

<Problems to be solved by the invention> However, since the dimensions of the rods vary widely, it is difficult to share jigs and tools, and the connecting hole and the diaphragm mounting end are located at both ends of the rod. The distance was also long, and it was difficult to obtain a predetermined dimensional accuracy. Moreover, in order to provide a connecting hole in a round bar, a separate process is required to flatten the connecting end by pressing, and the process tends to be complicated. In particular, when the rod must be bent due to the mounting position, the above-mentioned problem has a very large effect.

In view of these shortcomings of the prior art, the main purpose of the present invention is to provide an improved method that allows the common use of jigs and tools for fixing the diaphragm to the rod, and also simplifies the manufacturing process. An object of the present invention is to provide a diaphragm type actuator equipped with a rod.

<Means for Solving the Problems> According to the present invention, such an object is a diaphragm actuator having a diaphragm that responds to fluid pressure and a rod member that is connected to the diaphragm and performs reciprocating motion. This is achieved by providing a diaphragm actuator characterized in that the rod member is made of a plate material, and a hole is bored in the plate material near a connecting portion with the diaphragm.

<Function> By using the rod member as a plate material in this way, it can be manufactured by stamping, for example, so that the manufacturing process can be simplified. In addition, by providing an engagement hole for the jigs and tools near the diaphragm attachment part, the distance between the diaphragm attachment part and the engagement hole can be kept constant regardless of the overall length of the rod, making it possible to use common jigs and tools. becomes.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

In FIG. 1, a diaphragm actuator 3 is connected to an automatic choke device 2 consisting of a thermostat connected to a choke valve of a carburetor body 1 via a cam (not shown). The rod 4 of the diaphragm actuator 3 is bent with its axis offset upward to avoid interference due to the mounting positional relationship of each part. This actuator 3 is operated when the automatic yoke is released.

Further, a diaphragm actuator 7 is connected to the throttle valve shaft 5 via a lever 6. This actuator is an actuator for a dart pot, for example, for suppressing sudden closing of the throttle valve during deceleration.

As clearly shown in FIG. 2, the diaphragm actuator 3 for releasing the automatic yoke includes a diaphragm 23 held between a bowl-shaped housing 21 and a truncated cone-shaped cover 22.
Accordingly, a negative pressure chamber 24 is defined inside the housing 21.

A rod 4 is fixed to the center of the diaphragm 23 by caulking via disc-shaped retainers 25 arranged on both sides of the diaphragm, and the rod extends outward from the center hole of the cover 22. . Further, one retainer 25 facing the inside of the negative pressure chamber 24 and a coil spring 2 are provided on the inner surface of the housing 21.
6 is interposed to urge the diaphragm in a direction to expand the volume of the negative pressure chamber 24.

The rod 4 is formed by punching from a flat plate material, and is curved so that its axis is offset upward in FIG. 2 from the center of the diaphragm 23. An engagement hole 27 is provided at a suitable location near the caulking portion of the rod 4 with the diaphragm 23.
A connecting hole 28 is bored at the free end to be connected to a lever member or the like for transmitting the operating force.

These holes 27 and 28 can be bored simultaneously when the rod 4 is punched and formed, and if the distance between the engagement hole 27 and the diaphragm attachment end is set constant, the diaphragm 23 can be caulked. By sharing the same fixing jig, it is possible to perform caulking work on diaphragms with various rod sizes.

<Effects of the invention> As described above, according to the invention, it is possible to greatly simplify the manufacturing process by simply using plate materials instead of rod members, and it is possible to share jigs, which has a great effect on cost reduction. play. Moreover, it can be bent into a complicated shape extremely easily, which has the secondary effect of reducing design constraints.

[Brief explanation of the drawing]

FIG. 1 is a side view of a carburetor to which a diaphragm actuator according to the present invention is applied. FIG. 2 is a partially sectional side view of one embodiment of the present invention. 1... Carburetor main body, 2... Automatic chiyoke device,
3...Diaphragm actuator, 4...Rod, 5...Throttle valve shaft, 6...Lever, 7...
...Diaphragm actuator, 21...Housing, 22...Cover, 23...Diaphragm,
24...Negative pressure chamber, 25...Retainer, 26...Coil spring, 27...Engagement hole, 28...Connection hole.

Claims (1)

[Claims for Utility Model Registration] A diaphragm actuator comprising a diaphragm that responds to fluid pressure and a rod member that is connected to the diaphragm and performs reciprocating motion, wherein the rod member is made of a plate material, and the rod member is made of a plate material, and the rod member is made of a plate material. A diaphragm actuator characterized in that a hole is bored near a connecting portion with a diaphragm.