JPH0864092A - High pressure pressure switch - Google Patents

Abstract

PURPOSE: To obtain a high pressure pressure switch realizing a long service life, by making it possible to maintain the function of a switch, even though a permanent set is generated to a metallic sheet at the operation shaft side, of the laminated metallic sheets to compose a pressure sensitive reversal plate. CONSTITUTION: The reversal operation of a pressure sensitive reversal plate 4a formed by laminating metallic sheets, of a pressure reaction plate 4 provided in a switch main body tube 1, is transmitted to a switch 14 provided in a switch case 7 through an operating shaft 5. Of the laminated metallic sheets to compose the pressure sensitive plate of the pressure reaction plate 4, at least to one sheet at the side where the lower end of the operating shaft 5 is abutted, a hole 41 is formed, through which the lower end of the operating shaft 5 is to be abutted to the metallic sheets with no hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure switch, and more particularly to, for example, a vehicle power steering system,
It is applied as a pressure control switch for the hydraulic unit of a braking system, which generates a signal when the pressure exceeds a certain limit, interrupts the rise of pressure, and generates a signal when the pressure falls below a certain limit. The present invention relates to a diaphragm type high pressure switch having a function of raising the pressure.

[0002]

2. Description of the Related Art Conventionally, as this type of high pressure switch, for example, one shown in FIG. 4 disclosed in Japanese Utility Model Laid-Open No. 6-13036 is known. In the figure, 1
Is a metal switch body cylinder, one side of which is connected to a connection cylinder 3 having a fluid introduction hole 3a via a pressure resistant wall 2, and the pressure resistant wall is supported on the outside by an O-ring accommodating annular groove 2a. The base 2b is formed. A skirt portion 1b extending in the axial direction is provided on the other side of the switch body cylinder 1.

The pressure responsive plate 4 has a pressure sensitive reversal plate 4a which is formed by laminating a predetermined number of thin metal plates so as to obtain a high operating pressure. As shown in FIG. 5, each metal thin plate 4a ₁ forming the pressure-sensitive reversal plate 4a has a spherical concave portion 4a ₁₁ having a large radius of curvature formed in the central portion thereof and has a flat outer peripheral portion. It is formed into a shape. A pressure-sensitive reversal plate 4a formed by laminating a predetermined number of such disc-shaped metal thin plates is sandwiched between a metal upper cover 4b and a metal lower cover 4c having the same diameter from above and below, and its outer peripheral portion. Are integrated by welding. The upper cover 4b has an operating shaft 5 driven by reversing the pressure-sensitive reversing plate 4a.
Through hole 4b ₁ is formed, and the lower cover 4c has a large diameter that allows the reversing operation portion 4a ′ of the pressure sensitive reversing plate 4a formed by the spherical recess 4a ₁₁ of the metal thin plate to enter. Through hole 4c ₁ is formed.

A through hole 6a for inserting and guiding the actuating shaft 5 is formed at the center of the metal pressure-proof reinforcing plate 6, and a position regulating member for abutting the upper cover 4b around the through hole 6a is formed on the upper cover 4b side. An annular base portion 6b and an O-ring accommodating annular groove 6c on the outside thereof are formed, and a skirt portion 6g is provided on the switch case 7 side outside the thick-walled reinforcing portion 6d via an O-ring accommodating annular groove 6e and a supporting base portion 6f. It is formed extending in the direction.

The cup-shaped switch case 7 made of synthetic resin is provided with electric signal terminals 8 and 9 penetrating the upper plate portion, and is provided with a fixed contact 10 connected to one terminal 8.
A movable contact 12 is provided at the tip of a movable spring 11 extending from the other terminal 9, and the fixed contact 10 and the movable contact 12 constitute a switch 14.

In the above structure, the pressure sensitive plate 4 which is a polymer composed of the pressure sensitive reversing plate 4a, the upper cover 4b and the lower cover 4c, which are integrally welded to the outer peripheral portion in advance and are integrated, is housed. Upper cover 4b
The pressure resistant reinforcing plate 6 is superposed on the upper side, and the free end of the skirt portion 1b is swaged onto the tapered engagement part 6h of the pressure resistant reinforcing plate 6 to firmly fix them.

Next, the operating shaft 5 is inserted into the through hole 6a, the switch case 7 is placed on the pressure-proof reinforcing plate 6, and the free end of the skirt portion 6g is swaged to the engaging portion 7a so that the switch case 7 is secured. Fix it. In the above assembly process,
The O-ring 13 is mounted in advance in each O-ring receiving annular groove.

In the above-mentioned assembled state, the O-ring is in close contact with the periphery of the through hole of the lower cover 4c so that the switch body cylinder 1 receives the differential pressure. The reinforcing plate 6 has sufficient strength to withstand high pressure due to the thick-walled reinforcing portion 6d, and further, the position controlling annular base portion 6b around the through hole 6a of the pressure reinforcing plate 6 has a through hole 4b ₁ in the upper cover 4b.
Since precisely abut the periphery of the breakdown voltage with reliably prevent deformation of the upper cover 5, in this case, through-holes 4c ₁ of the lower cover 4c permits the entry of inversion operation portion 4a ₁ of the pressure responsive plate 4 Since the thick-walled reinforcing portion 6d of the reinforcing plate 6 is configured to enter the switch case 7, it is possible to make the whole compact. Incidentally, an example of the dimensions of the pressure response plate 4 is as follows: the diameter A is 21 mm, the thickness D is 4.971 mm, the thickness d of each cover is 1 mm, and the thickness t of each metal thin plate is 0.127 mm. .

As described above, in the high pressure switch which transmits the operation of the pressure responsive plate 4 provided in the switch body cylinder 1 to the switch 14 provided in the switch case 7 through the operating shaft 5, the switch body cylinder 1 A connection cylinder 3 having a fluid introduction hole 3a is provided on one side of the pressure resistance wall 2, and a lower cover 4 is sequentially arranged on the pressure resistance wall 2 in the switch body cylinder 1.
c, the pressure-sensitive reversing plate 4a, the pressure responsive plate 4 including the upper cover 4b and the pressure-proof reinforcing plate 6 are superposed and fixed, and the switch case 7 is superposed and fixed on the pressure-proof reinforcing plate 6, and the upper cover 4b and the pressure-proof reinforcing plate are fixed. Through holes 4b ₁ and 6a for inserting the actuating shaft 5 are formed in the plate 6, and the through hole 6a of the pressure-proof reinforcing plate 6 is formed.
The position-regulating annular base portion 6b formed on the periphery of the upper cover 4b abuts on the periphery of the through hole 4b ₁ of the upper cover 4b, and an O-ring seals between the periphery of the through hole 4c ₁ of the lower cover 4c and the pressure resistant wall 2. And the thick-walled reinforcement portion 6 formed on the pressure-resistant reinforcement plate 6.
Since d is located inside the switch case 7, it has a sufficient pressure resistant structure and can maintain accurate operation in a high pressure state, and it is compact in size. This is effective for mounting in a very limited space in a vehicle.

In the above-mentioned structure, the pressure-sensitive reversing plate 4a of the pressure responsive plate 4 has its reversing operation portion 4a ₁ inserted into the through hole 4c ₁ of the lower cover 4c, as shown in FIG. 6 (a). A gap g is formed between the molded upper cover 4b and the upper cover 4b serving as a stopper. Then, when the fluid pressure is applied to the reversing operation portion 4a ₁ of the pressure-sensitive reversing plate 4a from the lower cover 4c side and the pressure becomes equal to or higher than a predetermined working pressure, the reversing operation portion 4a ₁ of the pressure-sensitive reversing plate 4a.
6B loses this pressure and instantly reverses to a state in which its upper surface abuts the lower surface of the upper cover 4b, as shown in FIG. 6B. In such a state, the pressure-sensitive reversing plate 4
The reversing operation portion 4 ₁ of a has worked restoring force for restoring the in FIG. 6 (a), when fluid pressure is applied to the inverting operation portion 4a ₁ of the pressure-sensitive inversion plate 4a falls below a predetermined value, the pressure sensitive The reversal actuating portion 4a ₁ of the reversal plate 4a is re-reversed to restore the state of FIG. 6 (a).

As described above, the pressure sensitive reversal plate 4 of the pressure responsive plate 4
When a is reversed as shown in FIGS. 6 (a) and 6 (b) by the action of a fluid pressure higher than a predetermined value, this causes the operating shaft 5
Is raised to turn off the switch 14, and when the pressure falls below the operating pressure, the state is restored from (b) to (a), whereby the operating shaft 5 is lowered and the switch 14 is turned on.

[0012]

However, the reversing operation of the pressure-sensitive reversing plate 4a as described above is, for example, 2,000,000 to 300.
When it is repeated ten thousand times, as shown in FIG. 6C, some of the thin metal plates constituting the pressure-sensitive reversal plate 4a are lifted up on the side of the operating shaft 5. This is the pressure-sensitive reversal plate 4
It is considered that every time the reversing operation part 4a _{1 of a} is reversed, the upper surface thereof abuts the lower surface of the upper cover 4b, and a large impact is applied to the lower surface to cause sagging. In any case, when such a state occurs, the reference surface of the reversing operation portion 4a ₁ of the pressure-sensitive reversing plate 4a with which the lower end of the operating shaft 5 is abutted becomes high, and the switch 14 does not function normally. There was a problem.

Now, referring to FIG. 7 (a) showing the switching operation, with the fluid pressure acting on the pressure-sensitive operating plate 4a as the horizontal axis and the movement amount of the operating shaft 5 as the vertical axis, referring to FIG. The normal operation that has not occurred will be described. In FIG. 7 (a), when the fluid pressure rises to the reversal pressure F ₁ , the pressure sensitive reversal plate 4a reverses and the operating shaft 5 moves across the switch switching position to move from the on region to the off region. When the pressure drops to the return pressure F ₂ , the pressure-sensitive reversal plate 4a is restored and the operating shaft 5 moves from the OFF region to the ON region across the switch switching position, so that there is so-called hysteresis. Switching operation without chattering is possible.

However, when the metal thin plate is settled, the actuating shaft 5 is located at a position higher than the metal thin plate by the floating amount, so that the fluid pressure is the reversal pressure F as shown in FIG. 7B. ₁
When it rises up, the actuating shaft 5 moves from the ON region to the OFF region across the switch position, and when the liquid pressure changes across the switch position, the switch 14 turns ON-. The so-called chattering operation that turns off is started,
The switch 14 will not function normally.

Therefore, in view of the above-mentioned conventional problems, the present invention makes the function of the switch normal even if the set metal laminated thin plates constituting the pressure-sensitive reversal plate are depressed on the operating shaft side. The purpose of the present invention is to provide a high-pressure pressure switch that can be maintained for a long life.

[0016]

In order to achieve the above object, a high-pressure pressure switch according to the present invention is a pressure-sensitive reversal plate formed by laminating metal thin plates of a pressure-responsive plate provided inside a switch body cylinder. In a high-pressure pressure switch for transmitting the reversing operation of (1) to the switch provided in the switch case via the actuating shaft, one of the laminated metal thin plates constituting the pressure-sensitive reversing plate on which the lower end of the actuating shaft abuts A hole is made in at least one metal thin plate, and the lower end of the operating shaft is brought into contact with the holeless metal thin plate through the hole.

In order to achieve the above-mentioned object, the high pressure switch made according to the present invention also includes a connection cylinder having a fluid introduction hole through a pressure resistant wall on one side of the switch body cylinder, and the connection cylinder having the fluid introduction hole is provided in the switch body cylinder. Lower cover, pressure sensitive reversal plate formed by laminating thin metal plates, pressure responsive plate composed of upper cover and pressure reinforcing plate are polymerized and fixed, and switch case is stacked on the pressure reinforcing plate. The upper cover and the pressure-proof reinforcing plate are formed with through-holes for the operating shaft, and the position-regulating annular base portion formed around the through-holes of the pressure-proof reinforcing plate is provided around the through-hole of the upper cover. The O-ring between the periphery of the through hole of the lower cover and the pressure-resistant wall so that the thick-walled reinforcing portion formed on the pressure-resistant reinforcing plate is located inside the switch case. A high pressure switch for transmitting a reversing operation of the pressure-sensitive reversing plate to a switch provided in the switch case via the operating shaft, wherein a lower end of the operating shaft of the laminated metal thin plates constituting the pressure-sensitive reversing plate. A hole is formed in at least one thin metal plate on the side where the contact is made, and the lower end of the operating shaft is brought into contact with the thin metal plate without holes through the hole.

[0018]

In the above structure, the pressure-sensitive reversal plate of the pressure-responsive plate formed by laminating the metal thin plates repeats its reversing operation, so that the metal thin plate on the side where the operating shaft abuts rises up. Even if there is, a hole is made in at least one metal thin plate on the side where the lower end of the operating shaft comes into contact, and the lower end of the operating shaft is brought into contact with the metal thin plate without holes through this hole. Therefore, the floating of the perforated metal thin plate does not affect the position of the operating shaft.

Further, with the above construction, it is possible to have a sufficient pressure resistant structure and to maintain accurate operation in a high pressure state, and to make it compact.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a high pressure switch according to the present invention. In FIG. 1, parts equivalent to those of the conventional one described with reference to FIG. 4 are designated by the same reference numerals, and detailed description thereof will be given. Omit it. The high-pressure pressure switch made according to the present invention shown in FIG. 1 includes two thin metal plates constituting the pressure-sensitive reversal plate 4a on the side of the operating shaft 5 and slightly larger than the diameter of the operating shaft 5. It is the same as that of FIG. 4 except that a diameter hole 41 is opened.

In the above structure, the switch body cylinder 1
Fluid introduction hole of the connecting cylinder 3 provided on one side through the pressure resistant wall 2
3a, the fluid pressure is the reversal operation part of the pressure-sensitive reversal plate 4a.
4a ₁Is indicated by an arrow in FIG. 2 (a) from the side of the lower cover 4c.
The pressure exceeds the specified operating pressure.
And the reversing operation portion 4a of the pressure-sensitive reversing plate 4a.₁Is negative for this pressure
In a moment, the top surface of the
Reverse to the state where it abuts the lower surface of the cover 4b.
It In such a state, the reversing operation portion 4 of the pressure-sensitive reversing plate 4a is
₁Has a restoring force that restores the state of Fig. 2 (a).
The pressure-sensitive reversing plate 4a₁Have joined
When the fluid pressure drops below a predetermined level, the pressure-sensitive reversal plate 4a is not reversed
Rolling operation part 4a₁Is re-inverted and restored to the state of FIG.
Become so.

As described above, the pressure-sensitive reversal plate 4 of the pressure responsive plate 4
When a is reversed as shown in FIGS. 2 (a) and 2 (b) by the action of a fluid pressure above a predetermined level, this causes the operating shaft 5
Is raised to turn off the switch 14, and when the pressure falls below the working pressure, the state returns from (b) to (a), whereby the working shaft 5 is lowered and the switch 14 is turned on.
Then, the reversing operation of the pressure-sensitive reversing plate 4a is, for example, 2,000,000 to
When it is repeated 3 million times, as shown in FIG.
Two of the metal thin plates forming the pressure-sensitive reversing plate 4a on the side of the operating shaft 5 float up, but almost no floating occurs on the third metal thin plate with which the lower end of the operating shaft 5 abuts. It does not appear. A hole 41 is formed in the two floating metal thin plates, and the lower end of the actuating shaft 5 is in contact with the third metal thin plate, so that the actuating shaft 5 is initially shown in FIG. Will be maintained at the height of the reference plane of the
The switch 14 can function normally even if it is repeated 3 times.

The rise side working pressure of the pressure-sensitive reversing plate 4a in the case where a hole in the metal sheet as described above (kgf / cm ^2), the descending side working pressure (kgf / cm ²⁾ and the pressure difference (DIFF) The table below shows the case where the number of metal thin plates with holes is 0, 1, and 2 respectively. The table below shows that the holes in the metal thin plates reduce the spring force and increase. It can be seen that the side working pressure becomes low, but the down side working pressure does not decrease so much, and as a result, the pressure difference (DIFF) becomes small. Therefore, in actual use, the number of thin metal plates and the number of perforated thin metal plates may be selected in consideration of these factors.

[Table 1]

Also, with the surface of the thin metal plate against which the lower end of the operating shaft 5 abuts when the reversing operation of the pressure-sensitive reversing plate 4a is 0 times as a reference surface, a reference that changes according to the number of times of the reversing operation. When the rise value of the surface was plotted for the cases where the number of holes was 0 and 2, the result was as shown in the graph of FIG. As is clear from the graph, when the number of reversals is around 5 million times, the rise value when the number of holes is 2 is about 1/0 when the number of holes is 0.
It is 3.

In the above-mentioned embodiment, the pressure-sensitive reversing plate 4a is composed of 18 thin metal plates without holes and 2 thin metal plates with holes. However, the present invention is not limited to this. , A combination of other numbers can also be used effectively.
In any case, by lifting a hole in at least one of the metal thin plates on the side where the lower end of the operating shaft is abutted, which causes the floating by the reversing operation, the floating amount of the metal thin plate is raised. Will be able to prevent.

Although the high pressure switch shown in the drawing is a normally closed switch, it is obvious that it can be constructed as a normally open switch.

[0027]

As described above, according to the present invention, a hole is made in at least one metal thin plate on the side where the lower end of the actuating shaft abuts, and the lower end of the actuating shaft is passed through this hole to form a metal without holes. The thin metal plate is brought into contact with the thin metal plate so that even if the metal thin plate on the operating shaft side is depressed, the floating of the perforated thin metal plate does not affect the position of the operating shaft. , The function of the switch is normally maintained, the life is extended, and it has a sufficient pressure resistance structure to maintain accurate operation under high pressure condition, and it is compact in size. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a high pressure switch according to the present invention.

FIG. 2 is a cross-sectional view for explaining the action of enlarging a part of FIG.

FIG. 3 is a graph showing the effect of the present invention in comparison with the related art.

FIG. 4 is a sectional view showing an example of a conventional high pressure switch.

5 is a plan view showing the thin metal plate in FIG. 4. FIG.

FIG. 6 is a cross-sectional view for explaining a conventional problem in which a part of FIG. 4 is enlarged.

FIG. 7 is a diagram for explaining a switching operation of the high pressure switch of FIG.

[Explanation of symbols]

1 Switch Body 2 Pressure Bar 3 Connection Tube 3a Fluid Inlet 4 Pressure Response Plate 41 Hole 4a Pressure Sensitive Reversing Plate 4b Upper Cover 4b ₁ Through Hole 4c Lower Cover 4c ₁ Through Hole 5 Working Axis 6 Pressure Reinforcing Plate 6a Through Hole 6d Thick wall reinforcement 7 Switch case 14 Switch

Front page continuation (72) Inventor Hirotaka Liyama 1311 Aobadai, Tokorozawa, Saitama Prefecture Sagimiya Seisakusho Co., Ltd.

Claims (2)

[Claims] 1. A high pressure for transmitting a reversing operation of a pressure-sensitive reversing plate formed by laminating metal thin plates of a pressure responsive plate provided in a switch main body cylinder to a switch provided in a switch case through an actuating shaft. In the switch, at least one metal thin plate of the laminated metal thin plates constituting the pressure-sensitive reversal plate on the side where the lower end of the operating shaft is abutted is bored, and the lower end of the operating shaft is passed through the hole. A high-pressure pressure switch characterized by being brought into contact with a thin metal plate without holes. 2. A connection cylinder having a fluid introduction hole is provided on one side of the switch body cylinder through a pressure resistant wall, and a lower cover and a metal thin plate are sequentially laminated on the pressure resistant wall in the switch body cylinder. The pressure-sensitive reversing plate, the pressure responsive plate composed of the upper cover, and the pressure-proof reinforcing plate are superposed and fixed, and the switch case is overlaid and fixed on the pressure-proof reinforcing plate, and the upper cover and the pressure-proof reinforcing plate are fixed to the operating shaft. A through hole is formed, and a position-regulating annular base portion formed around the through hole of the pressure-proof reinforcing plate abuts around the through hole of the upper cover, and the periphery of the through hole of the lower cover and the pressure wall. Is sealed with an O-ring between them and the thick-walled reinforcing portion formed on the pressure-proof reinforcing plate is positioned inside the switch case, and the reversing operation of the pressure-sensitive reversing plate is performed through the operating shaft to the switch. In the case In a high pressure switch for transmitting to a switch provided in, a hole is formed in at least one metal thin plate on the side where the lower end of the operating shaft comes into contact among the laminated metal thin plates that constitute the pressure sensitive reversal plate, A high-pressure pressure switch, wherein the lower end of the actuating shaft is brought into contact with a thin metal plate without a hole through the hole.