JPH0348444Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to the improvement of diaphragms used, for example, in automobile fuel pumps.

(Prior Art) As shown in FIG. 1, a conventional diaphragm A consists of a circular rubber flexible plate 1 and a metal retainer 2 stacked on top of each other, and a receiving seat 3 having approximately the same diameter as the flat part of the retainer 2. It has a configuration in which it is fixed with a rivet 5 having a caulking head 4. And the diaphragm part B is
This diaphragm A is fixed to a fixed part 6 with a diaphragm cover 7 sandwiching the peripheral edge of the flexible plate 1, and a return spring interposed between the ceiling part 8 of the diaphragm cover 7 and the retainer 2. 9, an O-ring 14 is interposed between the head 13 of the bolt 12 which passes through the central opening 10 of the ceiling 8 and is screwed into the protrusion 11 of the rivet 5 and the ceiling 8. The central opening 10 can be opened and closed.

This diaphragm portion B has a structure in which the central opening 10 of the ceiling portion 8 of the diaphragm cover 7 is closed when the flexible plate 1 is flat, and opens when the flexible plate 1 is convex toward the ceiling. The intrusion of foreign substances such as water and dirt into the chamber 15 formed by the cover 7 and the flexible plate 1 is greatly reduced, and pressure fluctuations on the flexible plate 1 caused by temperature changes in the chamber 15 are reduced. It has the advantage that it can be reduced. However, since the flexible plate 1 and the retainer 2 are clamped and fixed between the receiving seat 3 of the rivet 5 and the caulking head 4, if the clamping force at this time is insufficient, the flexible plate 1 will move from one side to the other. The fluid will leak, and on the other hand, if the clamping force is strong, the flexible plate 1 will be stretched and the flexible plate 1 will become wavy.
There is a risk that the flexible plate 1 will be damaged due to repeated or alternating loads. In addition, there are slight variations in the thickness of the flexible plate 1 and the thickness of the retainer 2, and caulking is a process that is difficult to be consistent, so in order to avoid the above problems, extreme care must be taken during the work. There are various problems such as having to pay. Furthermore, there is a risk that the bolt 12 for opening and closing the central opening 10 of the ceiling part 8 of the diaphragm cover 7 may loosen due to the operation of the diaphragm, and there are many parts required to prevent the bolt from loosening, making the installation work complicated. There is also.

(Purpose of the invention) This invention provides a diaphragm applied to the diaphragm part having the above structure, which eliminates the above-mentioned problems and drawbacks of the diaphragm part, has no fear of leakage, and is easy to assemble. The purpose is to

(Structure of the invention) The diaphragm according to this invention includes a flexible plate, a protrusion provided on both sides of the flexible plate through narrow diameter parts, a knob provided on one of the protrusions, and the other of the protrusion. an extension part provided at the end of the extension part, a protrusion valve part provided at the tip of the extension part to open and close the ceiling opening of the diaphragm cover by the movement of the flexible plate, and a knob part provided on the protrusion valve part. The protrusion valve part and the protrusion have a diameter larger than the outer diameter of the narrow diameter part and are integrally formed of a flexible material, and are stretched in the direction of extension of the extension part by the knob part to have a small diameter. The retainer that has passed through the part is positioned in the narrow diameter part, and the retainer is held by the protruding part.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

Embodiment 1 FIG. 2 is a sectional view of a fuel pump showing an embodiment of this invention, in which 21 is a fuel pump case;
2 is a permanent magnet, 23 is a rotatable armature, 24 is a rotor connected to armature 23, 25 is a fuel suction port, 26 is a fuel discharge port, and 27 is a damper. The diaphragm A' constituting this damper 27 includes a diaphragm main body 30 and a diaphragm main body 30.
The retainers 3 provided on both sides of the flexible plate 31 of
2, 33, the diaphragm main body 30
is a protrusion 35 on the center of one side of the flexible plate 31 (the surface facing the diaphragm cover 34 when the diaphragm part B' is configured), and a protrusion 35 extending from the protrusion 35 in a direction away from the flexible plate 31. Extension part 3
6, a protruding valve part 38 which is provided following the extension part 36 and is located outside the ceiling opening 37 of the diaphragm cover 34 and opens and closes the ceiling opening 37 by the movement of the flexible plate 31; It has a knob part 39 extending further away from the flexible plate 31 from the part 38, and on the other side, an auxiliary protrusion 40 and an auxiliary protrusion 40 extending continuously from the auxiliary protrusion 40 at a symmetrical position with respect to the flexible plate 31. It has a knob part 41 that is
It is integrally molded from a rubber material such as NBR (neoprene-butadiene rubber).

Then, the diameters of the respective connection points between the flexible plate 31, the protruding portion 35, and the auxiliary protruding portion 40 are made smaller than the outer diameters of the protruding portions 35 and 40, and the retainer 3
The narrow diameter portions 42 and 43 are approximately equal to or slightly larger than the diameters of the insertion holes 44 and 45 of the protruding portions 3 and 3.
5. When the diameters of the protruding valve part 38 and the auxiliary protruding part 40 are extended by pinching and pulling the knob part 39 or 41, respectively, the retainer 32 ,3
The extension portion 36 and the knob portions 39 and 41 are sized to allow passage through the insertion holes 44 and 45 of No. 3, respectively.
are cylindrical in shape and have a diameter that allows them to pass through the insertion hole 44 or 45, respectively.

As a specific example, the insertion holes 44 and 45 of the retainers 32 and 33 have a diameter of 3 mm, and the protrusion 3
5. The diameter of the protruding valve part 38 and auxiliary protruding part 40 is 4 mm.
and the diameter of the extension part 36 and the knob parts 39, 41.
It was set to 1.5mm.

The diaphragm portion B' of this embodiment is assembled in the following order.

First, insert the knob 39 of the diaphragm main body 30 into the insertion hole 44 of the retainer 32, and then
By grasping and pulling the protruding valve portion 38 with your hand,
Push the retainer 32 in the direction of the flexible plate 31 while stretching it to pass the protruding valve part 38, and similarly pass the protruding part 35 to move the retainer 32 to the connection point between the flexible plate 31 and the protruding part 35. The narrow diameter portion 42 is
and is held by the protrusion 35. Next, in the same manner on the opposite side, the grip portion 41 is grasped and pulled to allow the retainer 33 to pass through the protrusion 40 and sit on the narrow diameter portion 43, and is held by the protrusion 40. The tab portion 39 of the diaphragm A' thus assembled is inserted into the ceiling opening 37 of the diaphragm cover 34, and the tab portion 39 is pulled to allow the protruding valve portion 38 to pass through the ceiling opening 37. Moreover, the return spring 46 is installed in a predetermined position before this. Next, the peripheral part of the flexible plate 31 is attached to the fixed part 4.
Place the diaphragm cover 34 on the specified location of 7.
The diaphragm part is assembled by bending the end part inward as shown in the figure, and at this time the protruding valve part 38 closes the ceiling opening 37 of the diaphragm cover 34 from the outside,
It is seated in the ceiling opening 37. And the flexible plate 31
When the valve bulges toward the ceiling of the diaphragm cover 34, the protruding valve portion 38 separates from the ceiling opening 37, and the interior and exterior of the diaphragm cover 34 communicate with each other.

Embodiment 2 FIG. 3 shows a diaphragm portion B'' of another embodiment having the diaphragm of this invention.

The difference between this second embodiment and the first embodiment is that the protruding valve portion 38 is located inside the ceiling opening 37' of the diaphragm cover 34'.
7' is configured to open and close.

Embodiment 3 FIG. 4 is a diagram showing still another embodiment of this invention, and in both of the embodiments described above, the protruding portion 35, the protruding valve portion 38, and the auxiliary protruding portion 40 were approximately spherical. In this embodiment, a case is shown in which each of them has an approximately conical shape, and the protrusion 3
5. The shapes of the protruding valve portion 38 and the auxiliary protruding portion 40 are not particularly limited as long as their respective functions are not impaired.

(Effects of the invention) As is clear from the above description, the diaphragm of this invention has a flexible plate and a protrusion provided on both sides of the flexible plate through the narrow diameter portions, and one of the protrusions. an extension part provided on the other side of the protrusion part; a protrusion valve part provided at the tip of the extension part to open and close the ceiling opening of the diaphragm cover by movement of the flexible plate; and the protrusion valve part; The provided knob portion is formed integrally with a flexible material so that the outer diameter of the protruding portion is larger than the outer diameter of the narrow diameter portion, and the knob portion is extended in the direction of extension of the extension portion. Since the retainer that has passed through the protruding valve part and the protruding part, which has a small diameter, is positioned in the small diameter part and the retainer is held by the protruding part, no leakage occurs from the flexible plate. In addition, since the valve part is molded integrally with these through the extension part, there is no need to assemble the valve part.
Moreover, there is no possibility that the valve part will come off. Furthermore, by setting the sizes of the extension part and the valve part to optimal conditions and pinching the knob part, it is possible to significantly improve the ease of assembly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional diaphragm, FIG. 2 is a sectional view showing a fuel tank to which a diaphragm according to an embodiment of the invention is applied, and FIG. FIG. 4 is a cross-sectional view showing the essential parts of a diaphragm of still another embodiment. 30...Diaphragm main body, 31...Flexible plate,
32, 33...Retainer, 34...Diaphragm cover, 35, 40...Protrusion part, 36...Extension part, 37...Ceiling opening, 38...Protrusion valve part, 3
9, 41...Knob portion, 42, 43...Small diameter portion.

Claims (1)

[Scope of utility model registration request] A flexible plate, a protrusion provided on both sides of the flexible plate through narrow diameter portions, a knob provided on one of the protrusions, an extension provided on the other side of the protrusion, and a tip of the extension. a protruding valve part provided on the diaphragm cover for opening and closing the ceiling opening of the diaphragm cover by movement of the flexible plate; and a knob part provided on the protruding valve part, the outer diameter of the protruding part being larger than the outer diameter of the narrow diameter part. A retainer that has a large shape and is integrally formed of a flexible material and that has passed through the protruding valve part and the protruding part, which is stretched in the direction of extension of the extension part by the knob part and has a small diameter, is attached to the small diameter part. A diaphragm, characterized in that the retainer is held by the protruding portion when the retainer is positioned.