JP3224354B2 - Mounting structure of 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 for fixing a pressure switch which is used in an automobile or the like and which is turned on / off by a pressure such as a negative pressure or a positive pressure to a mating member such as a tank. Regarding the structure.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional pressure switch mounting structure, in which a taper screw 52 of a switch side mounting portion 51 provided at an end of a pressure switch 50 is used.
The sealant (not shown) is applied to the threaded portions of the tapered screw holes 55 of the mating attachment portion 54 provided on the mating member such as a tank for attaching the sealing member, and the fastening is performed.

[0003]

However, in the conventional mounting structure of the pressure switch 50, the switch-side mounting portion 51 must be rotated many times by a special tool until it stops, and the application and drying of the sealant are performed. Was also required, and the installation work was troublesome.

Accordingly, the present invention provides a pressure switch mounting structure which does not require a special tool and a sealant and can easily fix the pressure switch to a counterpart member while maintaining airtightness by a rotation operation within one rotation. It is something to offer.

[0005]

According to a first aspect of the present invention, a cylindrical switch-side mounting portion made of a synthetic resin material provided at an end of a pressure switch is attached to a mating member for mounting the pressure switch. A pressure switch mounting structure, which is inserted into the cylindrical counterpart mounting portion provided in the axial direction, and is then fitted within the peripheral direction by being rotated within one rotation in a circumferential direction, wherein the switch side mounting portion and the mating side mounting portion are provided. A ring seal that is compressed and closely contacted by being inserted in the axial direction is provided between the mating surfaces of the switch and the switch side mounting portion or the mating side mounting portion. The other fitting surface, a recessed longitudinal groove for receiving the fitting projection by insertion in the axial direction, and a recessed lateral groove for receiving the fitting projection by rotation in the circumferential direction and restricting movement in the axial direction, A locking projection is provided for engaging the locking recess and restricting rotation in the circumferential direction. It is characterized in.

According to the first aspect of the present invention, the fitting protrusion and the retractable vertical groove are aligned, and the switch-side mounting portion is inserted into the mating-side mounting portion in the axial direction. The ring seal is drawn into the bottom side of the groove, and the ring seal is compressed between the fitting surfaces of the switch-side mounting portion and the mating-side mounting portion so as to be in close contact with each other to maintain airtightness.

[0007] By rotating the switch-side mounting portion in the circumferential direction with respect to the mating side mounting portion, the fitting protrusion is pulled into the drawing horizontal groove from the drawing vertical groove, and the switch-side mounting portion with respect to the mating side mounting portion. The movement in the axial direction can be restricted.

The rotation of the switch-side mounting portion allows the locking projection to engage with the locking concave portion, thereby restricting the rotation of the switch-side mounting portion in the circumferential direction.

[0009] Thus, the pressure switch can be easily fixed to the mating member with airtightness by a rotation operation within one rotation without the need for a special tool and a sealant.

According to a second aspect of the present invention, a contact projection is provided on one of the fitting surfaces of the switch-side mounting portion or the mating-side mounting portion according to the first aspect, and the other is axially inserted and circumferentially inserted. A notch portion for receiving the contact protrusion when rotating to the side, and a stopper for receiving the contact protrusion when the engaging concave portion and the engaging convex portion engage to prevent further rotation in the circumferential direction. It is characterized by:

According to the second aspect of the present invention, the stopper receives the contact protrusion when the locking concave portion and the locking convex portion engage with each other, and prevents further rotation in the circumferential direction.
By preventing excessive rotation of the switch-side mounting portion, the locking concave portion and the locking convex portion can be appropriately engaged at a predetermined position.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 5 show a first embodiment. FIG. 1 shows an external view of an exploded view of a switch-side mounting portion and a mating-side mounting portion. FIG. 2 shows a switch-side mounting portion and a mating-side mounting portion. FIG. 3 shows a plane in which a switch-side mounting portion and a mating-side mounting portion are inserted in the axial direction, and FIG. 4 shows a switch-side mounting portion and a mating-side mounting portion which are rotated and fitted in the circumferential direction. FIG. 5 shows a cross-section of the pressure switch in which the switch-side mounting portion and the mating-side mounting portion are fitted and mounted, and cut along the longitudinal direction.

As shown in FIGS.
Has a first body 2 made of a synthetic resin and a second body 3 made of a synthetic resin, and a tubular switch-side mounting portion 4 integrally provided at an end of the second body 3 is connected to a pressure switch 1. After being inserted in the axial direction X into the cylindrical counterpart mounting portion 6 provided integrally with the counterpart member 5 such as a tank for mounting the rotator, the fitting is rotated within one rotation in the circumferential direction Y and fitted. And fix it.

In the case of this embodiment, the mating mounting portion 6 is
An annular projection 7 is formed so as to be circumscribed on the outer peripheral surface of the switch-side mounting portion 4 from the inner peripheral surface as the fitting surface.
The first fitting projection 8 and the second fitting projection 9 are formed so as to face each other in the diametrical direction from the inner peripheral surface of the second fitting projection 9, and the locking recess 10 is formed on the inner peripheral surface of the second fitting projection 9. ing.

Further, on the inner peripheral surface of the mating side attaching portion 6, a contact projection 11 is provided at a predetermined distance inward of the annular projection 7 in the axial direction X and shifted from the first fitting projection 8 in the circumferential direction. It is protruding in a state where it is set.

An opening 12 on the tip side of the annular projection 7 of the mating side mounting portion 6 is provided with an O-ring 13 as a seal ring externally mounted on the side of the second body 3 of the switch side mounting portion 4.
And a diameter larger than the outer diameter of the seal retainer 14 provided on the switch-side mounting portion 4 for preventing the O-ring 13 from coming off.

On the outer peripheral surface of the switch-side mounting portion 4, a notch portion 15, a drawing vertical groove 16, a drawing horizontal groove 17, a holding ridge 18, a housing vertical groove 19, a housing horizontal groove 20, a locking protrusion 21 and a stopper 2 are provided.
It is equipped with 2.

The notch 15 is formed in a semicircular shape capable of receiving the contact projection 11 when the switch-side mounting portion 4 is inserted into the mating-side mounting portion 6 in the direction of the arrow X and rotated in the circumferential direction Y. I have.

The retractable vertical groove 16 is formed to have a width capable of receiving the first fitting projection 8 from one end in the circumferential direction of the notch 15 when the switch-side mounting portion 4 is inserted into the mating mounting portion 6 in the axial direction X. I have.

The retractable lateral groove 17 receives the first fitting projection 8 from the retractable vertical groove 16 by the rotation of the switch-side mounting portion 4 in the circumferential direction Y with respect to the counterpart mounting portion 6, and regulates the movement in the axial direction X. It is formed in width.

The pinching ridge 18 has a notch 15 and a retractable vertical groove 16.
And the recessed lateral groove 17 are formed.

The accommodation vertical groove 19 is formed by inserting the switch-side mounting portion 4 into the mating-side mounting portion 6 in the axial direction X.
Is formed in a width capable of receiving

The accommodation lateral groove 20 is formed to have a width capable of receiving the second fitting projection 9 from the accommodation longitudinal groove 19 by the rotation of the switch side attachment part 4 in the circumferential direction Y with respect to the counterpart attachment part 6.

The locking projection 21 is provided at the end of the lateral groove 20 so as to engage with the locking recess 10 so as to regulate the rotation in the circumferential direction Y.

The stopper 22 receives the contact projection 11 when the locking concave portion 10 and the locking convex portion 21 are engaged with each other at the other end of the notch portion 15 and can prevent further rotation in the circumferential direction Y. It is like that.

As shown in FIG. 5, the first switch of the pressure switch 1
Between the body 2 and the second body 3, a first pressure action chamber 2 is provided.
A rubber diaphragm 25 having insulating properties and separating the third pressure action chamber 24 from the third pressure action chamber 24 is provided.

The first pressure action chamber 23 has a fixed contact 2 for the positive electrode.
6, a fixed contact 27 for the negative electrode and a movable contact 28 are arranged.

The first body 2 is fitted and mounted on the second body 3 with the outer periphery of the diaphragm 25 interposed therebetween.

In the first body 2, a positive terminal 29 extending from the positive fixed contact 26 and a negative terminal 30 extending from the negative fixed contact 27 are buried. An accommodating hole 33 for inserting and mounting an external connector (not shown) having an electrode 31 and an anode 32 is formed.

When an external connector is inserted into the accommodation hole 33, the external connector is connected to the positive terminal 29 and the negative terminal 30 that protrude inside from the bottom of the accommodation hole 33.

In the first pressure action chamber 23, the fixed contact 26 for the positive electrode and the fixed contact 27 for the negative electrode, which are juxtaposed on the upper wall surface of the recess forming the first pressure action chamber 23 of the first body 2, Cup-shaped movable contact 2 fixed at the center
8 are arranged to face each other.

The movable contact 28 has a through hole 3 formed therein.
4, a locking portion 35 integrally projecting from the side surface of the diaphragm 25 on the side of the first pressure working chamber 23 is inserted into and engaged with the diaphragm 25 and attached to the diaphragm 25.

One contact portion 36 of the movable contact 28 corresponds to the fixed contact 26 for the positive electrode, and another contact portion 37 of the movable contact 28 corresponds to the fixed contact 27 for the negative electrode.

A switch spring 38 is provided at the center of the second body 3.

The switch spring 38 has an upper end fitted and mounted on a spring seat 39 integrally projecting from the lower surface of the diaphragm 25, and a lower end screwed so as to form a central passage 40 in the center of the second body 3. The movable contact 28 comes into contact with the fixed contact 26 for the positive electrode and the fixed contact 27 for the negative electrode by applying the spring force adjusted by the fastening amount of the screw 41 to the movable contact 28. I'm going.

The first body 2 has a communication hole 44 for connecting the first pressure action chamber 23 to an annular atmospheric pressure side passage 43 formed by the first body 2 and a cover 42 fitted on the outside of the first body 2.
Is formed.

According to the structure of the above embodiment, FIGS.
In the above, the position of the first fitting projection 8 of the mating side mounting portion 6 and one end of the notch 15 of the switch side mounting portion 4 are aligned, and the second fitting projection 9 of the mating side mounting portion 6 and the switch side mounting portion 4 are aligned. Position with the accommodation vertical groove 19.

By inserting the switch-side mounting portion 4 into the mating side mounting portion 6 in the axial direction X, the annular projection 7 of the mating side mounting portion 6 is inserted into the switch side mounting portion 4 as shown in FIG. The first fitting projections 8 are brought into contact with each other, and the first fitting projections 8 are pulled into the drawing vertical grooves 16 from the cutouts 15, and the second fitting projections 9 are pushed into the bottoms of the accommodation vertical grooves 19.

In parallel with this, as shown in FIG. 5, the opening 12 at the distal end of the mating attachment 6 compresses the O-ring 13, and the O-ring 13 compresses the opening at the tip of the mating attachment 6. Part 1
2 and the end face of the second body 3 are in close contact with each other, so that the airtightness between the switch-side mounting portion 4 and the mating-side mounting portion 6 can be maintained.

Next, by rotating the switch-side mounting portion 4 with respect to the mating-side mounting portion 6 in the circumferential direction Y, the first fitting projection 8 is retracted from the retracted vertical groove 16 as shown in FIG. The second fitting projection 9 is drawn into the housing lateral groove 20 from the housing vertical groove 19 while being drawn into the lateral groove 19, thereby restricting the movement of the switch-side mounting portion 4 in the axial direction X with respect to the counterpart mounting portion 6. it can.

By the rotation operation of the switch-side mounting portion 4, as shown in FIG. 4, the locking projection 21 of the switch-side mounting portion 4 becomes a part of the second fitting projection 9 of the mating-side mounting portion 6. , And the rotation of the switch-side mounting portion 4 in the circumferential direction Y is regulated, and at the same time, the stopper 22 of the switch-side mounting portion 4 is brought into contact with the contact projection of the mating-side mounting portion 6. 11 can be prevented from rotating further in the circumferential direction Y by contacting the switch side mounting portion 4 in the circumferential direction Y.

That is, by preventing the switch side mounting portion 4 from turning too far, the locking concave portion 10 and the locking convex portion 21 can be properly engaged at a predetermined position.

As a result, as shown in FIG. 5, the central passage 40 of the pressure switch 1 is connected to the vacuum passage 45 of the counterpart member 5 on the side for detecting the pressure while maintaining airtightness.

In this state, if the internal negative pressure value of the second pressure action chamber 24 is lower than the predetermined pressure value, the movable contact 28
The contact portions 36 and 16 contact the fixed contact 26 for the positive electrode and the fixed contact 27 for the negative electrode due to the elasticity of the switch spring 38, and the pressure switch 1 is turned on to close the electric circuit.

Conversely, when the internal negative pressure value in the second pressure action chamber 24 is higher than the predetermined pressure value, the contact portions 36 and 16 of the movable contact 28 resist the spring force of the switch spring 38 by the action of the diaphragm 25. Then, the pressure switch 1 is turned off and the electric circuit can be opened by further separating the fixed contact 26 for the positive electrode and the fixed contact 27 for the negative electrode.

In the above embodiment, the locking recess 10 provided in the second fitting projection 9 was engaged with the locking projection 21 provided in the accommodation lateral groove 20, but the locking recess 10 was fitted in the first fitting projection 8. A locking projection 21 is provided on the end side of the recessed lateral groove 17, and the locking recess 10 and the locking projection 21 are engaged with each other to restrict the rotation of the switch-side mounting portion 4 in the circumferential direction Y. Has the same effect.

In the above embodiment, the switch-side mounting portion 4 is provided.
Are formed so as to be fitted into the mating side mounting portion 6. However, the switch side mounting portion 4 is provided with the annular protrusion 7, the first fitting protrusion 8, the second fitting protrusion 9, the locking recess 10, and the contact protrusion 11. O-ring 13, seal holder 14, notch 1
5, retractable longitudinal groove 16, retractable lateral groove 17, holding ridge 18, accommodating longitudinal groove 19, accommodating lateral groove 20, locking convex portion 21, and stopper 22
And the switch-side mounting portion 4 is externally fitted to the mating-side mounting portion 6.

[0049]

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

According to the first aspect, the positions of the fitting projection and the drawing vertical groove are aligned, the switch-side mounting portion is axially inserted into the mating mounting portion, and the switch-side mounting portion is mated to the mating mounting portion. By rotating in the circumferential direction with respect to the part, the pressure switch can be easily fixed to the mating member with airtightness by a rotation operation within one rotation without using a dedicated tool or a sealant.

According to the second aspect, the stopper receives the contact projection when the locking concave portion and the locking convex portion engage with each other, and prevents further rotation in the circumferential direction. By preventing excessive rotation of the portion, the locking concave portion and the locking convex portion can be appropriately engaged at a predetermined position.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a schematic view showing a disassembled state of the embodiment in a plan view.

FIG. 3 is a schematic plan view showing a state in which the embodiment is inserted in the axial direction.

FIG. 4 is a schematic plan view showing a state in which the embodiment is fixed by rotation in a circumferential direction.

FIG. 5 is a sectional view of the pressure switch attached to the counterpart member of the embodiment.

FIG. 6 is a schematic view showing a conventional pressure switch mounting structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pressure switch 4 switch-side mounting portion 5 mating-side member 6 mating-side mounting portion 8 first fitting protrusion (fitting protrusion) 9 second fitting protrusion (fitting protrusion) 10 locking recess 11 contact protrusion 15 notch 16 Leading longitudinal groove 17 Leading lateral groove 21 Locking projection 22 Stopper X Axial direction Y Circumferential direction

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 9/00-9/28 H01H 35/34

Claims (2)

(57) [Claims] 1. A cylindrical switch-side mounting portion made of a synthetic resin material provided at an end of a pressure switch, and a cylindrical counterpart mounting portion provided on a counterpart member for mounting the pressure switch, A pressure switch mounting structure which is fitted within a rotation in the circumferential direction within one rotation after being inserted in the axial direction, wherein the pressure switch is inserted between the mating surfaces of the switch side mounting portion and the mating side mounting portion in the axial direction. In addition to providing a ring seal that is compressed and tightly contacted with one another, a fitting protrusion and a locking recess are provided on one fitting surface of the switch-side mounting portion or the mating-side mounting portion, and the other A retractable vertical groove for receiving the fitting protrusion upon insertion,
A recessed lateral groove for receiving the fitting projection by rotation in the circumferential direction and restricting movement in the axial direction, and a locking projection for engaging the locking recess and restricting rotation in the circumferential direction are provided. A pressure switch mounting structure characterized by the following. 2. A notch for receiving an abutting projection on one of the fitting surfaces of the switch-side mounting portion or the mating-side mounting portion, and receiving the abutting projection during insertion in the axial direction and rotation in the circumferential direction. 2. The pressure switch according to claim 1, further comprising a stopper for receiving the contact protrusion when the engaging concave portion and the engaging convex portion engage with each other and preventing further rotation in the circumferential direction. Mounting structure.