JP3415742B2 - pressure switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure switch which is used in, for example, an automobile or the like, and which is turned on / off at a pressure such as a negative pressure or a positive pressure.

[0002]

2. Description of the Related Art A first body and a second body are fitted and mounted with an outer peripheral portion of a diaphragm sandwiched therebetween, and the diaphragm separates two pressure action chambers inside the first body and the second body. A pressure switch is known in which a fixed contact is provided on the first body of the working chamber, and a movable contact is provided on the diaphragm so as to come into contact with or separate from the fixed contact due to a difference in internal pressure between the two pressure working chambers.

[0003]

However, in the above-mentioned conventional pressure switch, the first and second bodies are made of metal so as to be attached to the vehicle body side member and ground the body.
Since it is necessary to crimp the first and second bodies to secure the diaphragm, not only the assembly equipment is required, but the cost is disadvantageous, and also the weight is disadvantageous. I will end up.

For this reason, for example, as shown in FIG. 4, the first and second bodies 41 and 46 are molded from a synthetic resin material, and the first and second bodies 41 and 46 are fitted to each other and the It is conceivable that the convex portion 45 and the concave portion 48 of the fitting portion are engaged with each other so that they can be assembled with one touch.

Specifically, a receiving hole 42 is formed in one end of the first body 41, a connector lock portion 43 for engaging an external connector (not shown) is provided on the outer peripheral surface of the one end, and the other end is formed. A tubular fitting portion 44 is formed on the
A plurality of convex portions 45 are provided on the outer peripheral surface of the so as to be radially evenly arranged in the circumferential direction.

The second body 46 has a cylindrical fitting portion 4 at one end.
7 are formed, and a plurality of concave portions 48 are equally divided in the circumferential direction on the inner peripheral surface of the fitting portion 47 so as to correspond to the convex portions 45 of the first body 1.

The diaphragm 49 is formed of an insulating rubber into a shape to be housed inside the fitting portion 47 of the second body 46, and has two fixing members (not shown) for the positive electrode and the negative electrode on the upper surface of the central portion thereof. Cup-shaped movable contact 50 that contacts and separates from the contact
Is fixed, and the first and second bodies 41 and 46 are fitted by sandwiching the peripheral edge of the diaphragm 49, and the convex portion 45 and the concave portion 48 are engaged with each other for one-touch assembly.

However, when the first and second bodies 41, 46 are made of resin in this way, the first portion provided with the convex portion 45 is formed.
When molding the body 41, as shown in FIG. 5, the molding dies 51 and 52 of the first body 41 are connected to the connector lock portion 43.
Corresponding to, it is necessary to divide the mold in the left-right direction indicated by arrows X1 and X2 so that the mold can be opened.

Further, in order to uniformly compress the outer peripheral portion of the diaphragm 49 by the fitting portions 44 and 47 of the first and second bodies 41 and 46 to ensure airtightness, for example, six convex portions 45 are radially formed. When the molds 51, 52 are evenly arranged in the circumferential direction,
When the molds 51 and 52 are opened, the corners 45a, 45b and 45, which become undercuts when the molding dies 51 and 52 are opened, are formed on the projections 45 other than the projections 45 located on the divided surfaces 53 and 54 when the molds are opened.
Since c and 45d are generated, the die cannot be die-cut, and it cannot be adopted suddenly.

Therefore, according to the present invention, it is possible to reduce the weight of the first body and the second body by using a resin and to perform one-touch assembly, and to cause a slight problem in the moldability of the first and second bodies. There is no pressure switch to try to provide.

[0011]

According to a first aspect of the present invention, a first body and a second body made of a synthetic resin material are coaxially fitted and mounted with an outer peripheral portion of the diaphragm interposed therebetween, and the diaphragm A first pressure action chamber and a second pressure action chamber are separated from each other inside the first body and the second body, and the first pressure action chamber has a first pressure action chamber.
The structure is such that the body is provided with two fixed contacts for the positive electrode and the negative electrode, and the diaphragm is provided with a movable contact that comes into contact with or separates from the fixed contacts due to the pressure difference between the internal pressures of the first and second pressure action chambers. In addition, a plurality of convex portions that engage with the concave portions provided in the fitting portion of the second body are radially arranged equally on the outer peripheral surface of the fitting portion of the first body in the circumferential direction. It is characterized in that, on both sides in the circumferential direction, there is formed a draft for a mold that is divided so that the mold can be opened in one direction so that the mold can be removed when the mold is opened.

According to the first aspect of the invention, the first body is provided with two fixed contacts for the positive electrode and the negative electrode which come into contact with and separate from the movable contact attached to the diaphragm, and the fixed body is provided on the second body side of the diaphragm. Since conduction is not required, the number of control points for conduction can be reduced, and since the first and second bodies are made of synthetic resin, the moldability is good and the cost is obtained, and the weight is light. Can be realized.

Further, by fitting the first body and the second body and engaging the convex portion of the first body with the concave portion of the second body, the outer peripheral portion of the diaphragm is sandwiched between the first body and the second body. Since the body can be assembled with one touch, the assembling performance can be further improved.

Further, since a plurality of convex portions of the first body are formed on both sides in the circumferential direction with respect to the die cutting from the molding die, the convex portions are radially formed on the outer peripheral surface of the first body. However, even if it is protruding, it will not hinder the die cutting at the time of die molding.

Furthermore, since the convex portions of the first body are radially evenly arranged in the circumferential direction so as to engage with the concave portions of the second body, the outer circumference of the diaphragm is formed by the first and second bodies. Since the entire circumference of the portion can be uniformly compressed and sandwiched, the airtightness of these fitting portions of the first and second bodies can be improved.

According to a second aspect of the present invention, the areas of the plurality of convex portions according to the first aspect are the same.

According to the second aspect of the present invention, since the plurality of convex portions 5 are formed to have the same area, the convex portions and the concave portions are engaged with each other to fit the fitting portions of the first and second bodies. When the outer peripheral part of the diaphragm is compressed and sandwiched by, the reaction force due to the restoring elasticity from the diaphragm can be evenly carried by the engaging part of each convex part and concave part, and the fitting of the first and second bodies The airtightness of the part can be further improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment, and FIG. 1 shows a first embodiment.
The cross section which cut | disconnected the fitting part 4 of the body 1 and its shaping | molding molds 14 and 15 along a horizontal direction is shown, and FIG. 2 shows the external appearance of the 1st and 2nd bodies 1 and 6 and the diaphragm 9. Reference numeral 3 shows a cross section of the pressure switch cut along the vertical direction.

As shown in FIG. 2, the first body 1 is made of an insulating synthetic resin material, and a connector lock portion 3 is provided on the outer peripheral surface of one end portion in which the accommodation hole 2 is formed, and the other end portion is provided. On the outer peripheral surface of the formed tubular fitting portion 4, a plurality of convex portions 5 are radially arranged and equally divided in the circumferential direction.

The second body 6 is formed of an insulating synthetic resin material, and a plurality of recesses 8 are formed in a cylindrical fitting portion 7 formed at one end of the second body 6 so as to correspond to the protrusions 5 of the first body 1. Penetration is performed by equally arranging in the circumferential direction.

The diaphragm 9 is formed of an insulating rubber into a shape to be accommodated inside the fitting portion 7 of the second body 6, and the cup-shaped movable contact 10 is fixed to the upper surface of the central portion thereof.

In the case of this embodiment, the movable contact 10 has a plurality of contact portions 11, 12 and 13 projecting upward from the peripheral edge.

As shown in FIG. 1, on both sides 5a and 5b in the circumferential direction of the convex portion 5 of the first body 1, the mold can be opened in the left and right directions corresponding to the connector lock portions 3 by the arrows X1 and X2. The mold 1 for the molds 14 and 15 divided into
A draft angle is formed so that the molds 4 and 15 can be opened when the molds are opened.

For example, in this embodiment, the molding dies 14 and 15 are used.
With respect to the dividing surfaces 16 and 17 of 6 as the center, six convex portions 5 are formed at an equal angle of 60 degrees, and both side portions 5a and 5b in the circumferential direction of the convex portions 5 are formed at 60 degrees. A draft is formed as an inclined surface having a included angle.

As shown in FIG. 3, the fitting portion 4 of the first body 1 is internally fitted to the fitting portion 7 of the second body 6, and the fitting portion 4 and the fitting portion 4 of the second body 6 form the diaphragm 9. By compressing and sandwiching the outer peripheral portion and engaging the convex portion 5 of the first body 1 with the concave portion 8 of the second body 6, the first and second bodies 1 and 6 are fixed while maintaining airtightness. There is.

As a result, the first body 1 and the diaphragm 9 form a first pressure acting chamber 18, and the diaphragm 9 and the second body 6 form a second pressure acting chamber 19.

In the first pressure working chamber 18, the diaphragm 9
And the fixed contact 20 for the positive electrode and the fixed contact 21 for the negative electrode, which are provided in parallel on the upper wall surface of the recess forming the first pressure action chamber 18 of the first body 1, are arranged so as to face each other. is there.

The movable contact 10 corresponds to one of the contact portions 11 and the fixed contact 20 for the positive electrode, and the other contact portion 12 of the movable contact 10 corresponds to the fixed contact 21 for the negative electrode.

The first body 1 has a fixed contact 20 for the positive electrode.
A further extended positive electrode terminal 22 and a negative electrode terminal 23 extended from the negative electrode fixed contact 21 are embedded.

When an external connector (not shown) is inserted into the housing hole 2 of the first body 1, the positive electrode 24 and the negative electrode 25 of the electric circuit are connected to the positive electrode terminal 22 protruding from the bottom of the housing hole 2 by the external connector. While being connected to the negative electrode terminal 23, the external connector is engaged and fixed to the connector lock portion 3 (see FIG. 1) of the first body 1.

A switch spring 26 is housed in the center of the second body 6.

The upper end of the switch spring 26 abuts a synthetic resin spring seat 27 which is caulked and fixed to the side surface of the diaphragm 9 on the side of the second pressure chamber 19 together with the movable contact 10, and the lower end thereof is in contact with the second body 6. A screw 28 made of synthetic resin, which is screwed in the central part of the
The movable contact 10 and the diaphragm 9 are urged toward the positive electrode fixed contact 20 and the negative electrode fixed contact 21 by the spring force adjusted by the fastening amount of 8.

A communication hole 31 is formed in the first body 1 to connect the first pressure acting chamber 18 to an annular atmospheric pressure side passage 30 formed by the first body 1 and a cover 29 fitted and fitted to the outside of the first body 1.
Has been formed.

A seal member 32 is attached to the outside of the second body 6 to maintain airtightness when the second body 6 is attached to a vehicle body side member (not shown).

In the state where the central passage 33 of the second body 6 attached to the vehicle body side member is connected to the vacuum passage (not shown) on the side where the pressure is detected, the internal negative pressure value of the second pressure action chamber 19 is increased. Is lower than a predetermined pressure value, the contact portions 11 and 12 of the movable contact 10 contact the positive electrode fixed contact 20 and the negative electrode fixed contact 21 due to the elasticity of the switch spring 26, so that the pressure switch is turned on. While closing the electric circuit, when the internal negative pressure value of the second pressure action chamber 19 is higher than the predetermined pressure value, the diaphragm 9 acts so that the contact portions 11 and 12 of the movable contact 10 are the springs of the switch spring 26. By separating the fixed contact 20 for the positive electrode and the fixed contact 21 for the negative electrode from each other against the force, the pressure switch is turned off to open the electric circuit.

According to the structure of the above embodiment, the first body 1 is in contact with the movable contact 10 attached to the diaphragm 9.
Since the positive electrode fixed contact 20 and the negative electrode fixed contact 21 which are separated from each other are not required to make conduction on the second body 6 side of the diaphragm 9, it is of course possible to reduce the management points for conduction. Since the first body 1 and the second body 6 are made of synthetic resin, the moldability is good, the cost is advantageously obtained, and the weight can be reduced.

Further, the fitting portions 4 and 7 of the first body 1 and the second body 6 are fitted to each other, and the convex portion 5 of the first body 1 is fitted to the second body 6.
By engaging with the concave portion 8 of the diaphragm 9, the outer peripheral portion of the diaphragm 9 can be sandwiched and the first and second bodies 1 and 6 can be assembled with one touch, so that the assembling property can be further improved.

Further, as shown in FIG. 1, on both side portions 5a, 5b in the circumferential direction of the plurality of convex portions 5 of the first body 1, in the left-right direction indicated by arrows X1, X2 corresponding to the connector lock portion 3. Since the drafts that can be removed from the molds 14 and 15 when the molds 14 and 15 are opened are formed on the molds 14 and 15 that are divided so that the molds can be opened. Even if they are projected radially on the mold 14,
The molding of the first body 1 can be easily carried out without causing any difficulty in the molding during the molding of the first body 1.

Further, the plurality of convex portions 5 of the first body 1 are provided radially evenly in the circumferential direction, and the second body 6 is provided.
Since the first and second bodies 1 and 6 can be evenly compressed over the entire outer peripheral portion of the diaphragm 9 so as to be sandwiched by the first and second bodies 1 and 6, these first and second bodies 1 and 6 can be engaged. The airtightness of the fitting portions 4 and 7 of the two bodies 1 and 6 can be improved.

Particularly, since the respective convex portions 5 are formed to have the same area, the convex portions 5 and the concave portions 8 are engaged with each other to form the first and second concave portions.
When the outer peripheral portion of the diaphragm 9 is compressed and sandwiched by the fitting portions 4 and 7 of the bodies 1 and 6, the reaction force due to the restoring elasticity from the diaphragm 9 is made uniform at the engaging portions of the convex portions 5 and the concave portions 8. Thus, the airtightness of the fitting portions 4 and 7 of the first and second bodies 1 and 6 can be further improved.

The recess 8 of the second body 6 can be easily molded by a known slide core provided in the mold.

Further, in the above embodiment, the first body 1 is provided with six convex portions 5, but the number of the convex portions 5 is not limited.

[0044]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the first body is provided with two fixed contacts for the positive electrode and the negative electrode which come into contact with and separate from the movable contact attached to the diaphragm, thereby eliminating the need for conduction on the second body side of the diaphragm. Therefore, the number of management points for conduction is reduced, and therefore, the electrical conduction structure can be simplified, and the number of conduction portions can be reduced to reduce the cost.

Further, since the first body and the second body are made of synthetic resin, the moldability of these first and second bodies is good, the cost is advantageously obtained, and the weight can be reduced.

By fitting the first body and the second body and engaging the convex portion of the first body with the concave portion of the second body, the outer peripheral portion of the diaphragm is sandwiched between the first body and the second body. Since the body can be assembled with one touch, the assembling performance can be further improved.

Further, since a draft is formed on both sides in the circumferential direction of the plurality of convex portions of the first body for the die cutting from the molding die, the convex portions are radially formed on the outer peripheral surface of the first body. However, even if it is protruding, it will not hinder the die cutting at the time of die molding.

Further, since the convex portions of the first body are radially evenly arranged in the circumferential direction so as to engage with the concave portions of the second body, the outer circumference of the diaphragm is formed by the first and second bodies. Since the entire circumference of the parts can be uniformly compressed and sandwiched, the airtightness of the fitting parts of the first and second bodies can be improved.

According to the second aspect, since the plurality of protrusions 5 are formed to have the same area, the protrusions and the recesses are engaged with each other so that the fitting portions of the first and second bodies form the diaphragm. When the outer peripheral portion is compressed and sandwiched, the reaction force due to the restoring elasticity from the diaphragm can be evenly applied to the engaging portion between each convex portion and the concave portion,
The airtightness of the fitting portions of the first and second bodies can be further improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fitting part and a molding die of a first body according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing first and second bodies and a diaphragm of the same embodiment.

FIG. 3 is a cross-sectional view showing the pressure switch of the same embodiment.

FIG. 4 is an exploded perspective view showing first and second bodies and a diaphragm considered in the process of reaching the present invention.

5 is a cross-sectional view showing a first body and a molding die shown in FIG.

[Explanation of symbols]

1st body 4 Fitting part 5 convex 6 second body 7 Fitting part 8 recess 9 diaphragm 10 movable contacts 18 First pressure chamber 19 Second pressure chamber 20 Fixed contact for positive electrode 21 Fixed contact for negative electrode

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Claims (2)

(57) [Claims] 1. A first body and a second body made of a synthetic resin material are coaxially fitted and mounted so as to sandwich an outer peripheral portion of the diaphragm, and the first body is provided inside the first body and the second body by the diaphragm. The pressure action chamber and the second pressure action chamber are separated from each other, and
Two fixed contacts for the positive electrode and the negative electrode are provided on the first body of the pressure action chamber, and a movable contact that comes into contact with or separates from the fixed contact by the differential pressure of the internal pressure of the first and second pressure action chambers on the diaphragm. And a plurality of convex portions that engage with the concave portions provided in the fitting portion of the second body are radially arranged equally on the outer peripheral surface of the fitting portion of the first body in the circumferential direction. At the same time, a pressure switch is provided on both sides in the circumferential direction of the convex portion, with respect to a mold that is divided so as to be mold-openable in one direction, and a draft angle that can be removed when the mold is opened. . 2. The pressure switch according to claim 1, wherein the plurality of convex portions have the same area.