JPH08212889A - Connector for pressure switch - Google Patents

Abstract

PURPOSE: To reduce the number of part for dust prevention and water proof without loosing dust preventing and water proofing functions and to reduce the number of process for assembling. CONSTITUTION: An air hole 9 for allowing an atmospheric chamber 7 to communicate with the outside air is formed on a pressure switch 1. A housing chamber 14 having a terminal 10 for outputting a signal showing the on/off of the pressure switch 1 and an engaging chamber 15 having an engaging projection 18 are formed on the head part of the pressure switch 1. A connector 21 is connected to the head part. The connector 21 has a body 21a and a protecting ring 23 which are integrally molded. The body 21a has a connecting terminal and an engaging claw B, and at connection, the connecting terminal is connected to the terminal 10 in the housing chamber 13, and the engaging claw B is engaged with the engaging projection in the engaging chamber 15. At this connection, the cylindrically formed protecting ring 23 covers the circumference of the air hole 9 to protect the air hole 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure switch connector, and more particularly to a connector having a dustproof and waterproof function for a vent hole communicating with an atmosphere chamber.

[0002]

2. Description of the Related Art FIG. 3 shows a sectional view of a conventional pressure switch. In this pressure switch 50, an inner housing 52 made of glass-containing PBT (polybutylene terephthalanol) is connected to a stainless steel body 51. A diaphragm 53 is sandwiched between the body 51 and the housing 52. A movable contact 54 is provided on the diaphragm 53, and a fixed contact 55 is fixed to the body 51.

The introduction hole 5 formed in the body 51
When the pressure fluid to be detected is introduced from 6 and the pressure of the fluid becomes equal to or higher than a predetermined pressure, the diaphragm 53 moves against the biasing force of the spring 58 arranged in the atmosphere chamber 57 formed in the inner housing 52. To do. By this movement, the movable contact 54 and the fixed contact 55 are separated from each other. The terminal 59 formed on the base end portion of the inner housing 52 based on this separation outputs an off-state signal based on the separation as a pressure detection signal. Terminal 59
It is connected to a terminal of a connector 61 connected to the base end of the inner housing 52, and the pressure detection signal is output to the control device.

By the way, the inner housing 52 includes
A ventilation hole 62 that connects the atmosphere chamber 57 and the outside air is formed. The ventilation holes 62 allow air to flow in and out of the atmosphere chamber 57 based on the movement of the diaphragm 53, thereby enabling the movement of the diaphragm 53.

Therefore, if the ventilation hole 62 is clogged with dust or the like, the diaphragm 53 cannot move and the pressure switch 50 does not function. In particular, since air flows in and out of the ventilation holes 62, dust and the like are likely to adhere to the ventilation holes 62, which is easy. Therefore, in order to prevent this, a dustproof / waterproof ring 63 is provided. The ring 63 is made of PBT and is fitted to the inner housing 52 so as to cover the periphery thereof. The ring 63 covers the ventilation hole 62 formed in the housing 52 so as to prevent dust and the like from adhering thereto.

[0006]

In the pressure switch 50, since the dustproof / waterproof ring 63 is provided on the housing 52 for prevention, the number of parts has been increased. Further, since the dustproof / waterproof ring 63 is required to be assembled, the number of steps in the process of assembling the pressure switch is increased.

The present invention has been made to solve the above problems, and an object thereof is to reduce the number of parts for dustproofing / waterproofing without impairing the dustproofing / waterproofing function and to assemble It is an object of the present invention to provide a pressure switch connector capable of reducing the number of steps.

[0008]

In order to solve the above problems, the invention according to claim 1 is connected to a pressure switch,
In a pressure switch connector that transmits a signal from the pressure switch, a protective member for protecting a vent hole for communicating an atmosphere chamber formed in the pressure switch with the outside air is integrally formed with a connector body. To do.

The invention according to claim 2 is, in the invention according to claim 1, characterized in that the protective member is a protective ring for covering the periphery of the pressure switch. According to a third aspect of the present invention, in the first or second aspect of the present invention, the connector body is provided with an engagement portion capable of engaging with a pressure switch, and the engagement portion has a pressure when being connected to the pressure switch. The main point is to engage with the switch.

[0010]

Therefore, according to the first aspect of the present invention, only by connecting the pressure switch connector to the pressure switch, the protective member integrally formed with the pressure switch connector protects the vent hole of the pressure switch. Therefore, the number of parts for dustproofing / waterproofing for protecting the vent hole is reduced, and the man-hour for connecting the connector to the pressure switch is also reduced.

According to the second aspect of the present invention, the protection ring covers the periphery of the pressure switch only by connecting the pressure switch connector to the pressure switch, and the ventilation ring and the atmosphere are shielded by the protection ring. Protect the ventilation holes.

According to the third aspect of the invention, the pressure switch and the pressure switch connector can be easily connected by simply engaging the engagement portion of the pressure switch connector with the pressure switch.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention is shown in FIG.
It will be described with reference to FIG. As shown in FIG. 1, the pressure switch 1 includes a body 2 made of stainless steel and a PBT containing glass.
The inner housing 3 is formed of (polybutylene terephthalanol), and the inner housing 3 is connected to the body 2 and inside the body 2. Body 2
A diaphragm 4 is sandwiched between the inner housing 3 and the inner housing 3.

The body 2 is formed with an introduction hole 5 for introducing the working oil as the pressure fluid to be detected into the body 2. A fixed contact 6 is attached to a position corresponding to the introduction hole 5 inside the body 2, and a fixed contact 6 is formed with a through hole 6a. Then, the hydraulic oil introduced from the introduction hole 5 is introduced into the body 2 through the through hole 6a.

An atmosphere chamber 7 is formed in the inner housing 3. A spring 8 is arranged in the atmosphere chamber 7. A vent hole 9 is formed in a side portion of the inner housing 3 to connect the atmosphere chamber 7 and the outside air. The atmosphere chamber 7 of the inner housing 3 is provided with a terminal 10 whose one end projects to the outside. The terminal 10 and one end of the spring 8 are in contact with each other in the atmosphere chamber 7.

A movable contact 11 is attached to the diaphragm 4. The movable contact 11 is connected to the other end of the spring 8 via the inner plate 12. The fixed contact 6, the spring 8, the inner plate 12, and the movable contact 11 are made of a conductor such as copper.

The movable contact 11 is constantly pressed to the fixed contact 6 side by the urging force of the spring 8, contacts the fixed contact 6, and is electrically connected to the fixed contact 6. That is, when the hydraulic oil is not introduced from the introduction hole 5, or even when the hydraulic oil is introduced from the introduction hole 5 and presses the diaphragm 4 against the biasing force of the spring 8, the introduced hydraulic oil is introduced. When the pressure is less than the specified pressure defined by the spring 8, the movable contact 11 is in contact with the fixed contact 6. In this case, the fixed contact 6 and the terminal 10 are electrically connected, and the pressure switch 1 is turned on. Then, the pressure switch 1 outputs an ON signal (12V, 0.3A) from the terminal 10.

On the other hand, when the pressure of the introduced hydraulic oil exceeds the specified pressure, the movable contact 11, the diaphragm 4 and the inner plate 12 move to the spring 8 side. That is, the movable contact 11 and the fixed contact 6 are separated from each other. Then, the pressure switch 1 is turned off and the on signal is not output from the terminal 10.

As shown in FIGS. 1 and 2, the head portion of the pressure switch 1 serves as a connecting portion 13 for connecting a connector 21 for transmitting a signal output from the terminal 10 to an external device. This connecting portion 13 is the terminal 1
A storage chamber 14 storing 0 and an engagement chamber 15 are provided, and the storage chamber 14 and the engagement chamber 15 are separated by an inner wall 16.
Further, the outer wall 17 of the engagement chamber 15 has an engagement protrusion 18 formed by forming an opening 17a in the outer wall 17.

The connector 21 comprises a connector body 21a for transmitting a signal from the pressure switch 1 and a protective ring 23 as a protective member for protecting the vent hole 9 communicating with the atmosphere chamber 7. This connector body 2
1a and the protection ring 23 are integrally formed of the same material (PBT).

An engaging claw B as an engaging portion is formed on the connector body 21a. The engaging claw B includes an elastic arm B1 and an engaging recess B2. When the connector 21 is pushed into the pressure switch 1 as shown by the arrow in FIG.
The connection terminal is connected to the terminal 10. Further, the arm B1 is pushed into the engagement chamber 14 while flexing, and the engagement projection 18 is fitted into the engagement recess B2 in due course, and the engagement projection 18 and the engagement claw B are engaged with each other, so that the connector 2
1 and the pressure switch 1 are connected. On the other hand, connector 2
When removing 1 from the pressure switch 1, the pressing portion B3 of the engagement claw B is pressed inward, the arm portion B1 is bent inward by a finger or the like, and the engagement protrusion 18 and the engagement recess B2 are engaged. The connector 21 is detached by pulling out the connector 21 in the state of releasing.

When an ON signal is output from the terminal 10 in a state where the connector 21 and the pressure switch 1 are connected, the connector 21 outputs the signal from the cord 22 and the signal from the terminal 21 is turned off. When,
The connector 21 outputs the signal from the cord 22. Then, these signals are transmitted by the code 22 and output to, for example, a control device for controlling hydraulic oil.

The protection ring 23 has a cylindrical shape with a circular cross section, extends from the main body 21a, and surrounds the outer circumference of the pressure switch 1 where the vent hole 9 is located. Further, the protection ring 23 is formed so as to widen toward the front end, and the front end portion is in contact with the body 2. A guide portion 23a having a large inner diameter is provided at the tip of the protection ring 23 so that the side surface of the body 2 can be more easily contacted.

Thus, the pressure switch 1 and the connector 21 are
At the time of connection with, the ventilation hole 9 is shielded from the atmosphere by the protection ring 23, and the space 24 is formed by the body 2, the inner housing 3, and the protection ring 23. Further, at the time of this connection, a slight gap is formed between the protective ring 23 and the body 2 without being completely sealed. Therefore, air can flow in and out of the space 24 and the atmosphere outside the space 24, but since the gap is very narrow, dust, water drops, oil drops, etc. contained in the air enter the space 24. Can not. Therefore, the air in the space 24 is always kept clean.

In this pressure switch 1, the diaphragm 4 moves based on the pressure of the introduced hydraulic oil, and the pressure switch 1 is turned on / off. When the diaphragm 4 moves, the volume in the atmosphere chamber 7 changes, and based on the change, air flows in and out through the ventilation hole 9. Further, when a temperature change occurs in the atmosphere chamber 7 or the like and a pressure change occurs in the atmosphere chamber 7, a pressure difference occurs between the atmosphere chamber 7 and the space 23.
Air flows in and out through the vent hole 9 based on the difference.

The breathing action of the vent hole 9 due to the inflow and outflow of air from the vent hole 9 is such that the vent hole 9 is shielded by the protective ring 23, so that the clean air accumulated in the space 24 is maintained. Between and. Therefore, the dust or the like does not mix into the atmosphere chamber 7 and has a dustproof / waterproof function. The dustproof / waterproof function can prevent the vent hole 9 from being clogged by the dust or the like, so that the normal pressure is applied. The sensor 1 can be operated. Moreover, in this shielded state, a slight gap is formed between the protective ring 23 and the body 2, and only air flows in and out through the gap. Therefore, dust, water drops, and the like cannot enter the space 24, and the dustproof and waterproof effects can be further increased.

Further, since the connector 21 is provided with the protective ring 23, the vent hole 9 can be easily covered and protected by simply connecting the connector 21 to the pressure sensor 1. Therefore, the number of parts for dustproofing / waterproofing can be reduced, and the number of assembly steps for dustproofing / waterproofing can be reduced. Moreover, the connector body 21a and the protection ring 2
Since 3 and 1 are integrally molded, the number of parts of the connector 21 itself can be reduced, and the number of manufacturing steps of the connector 21 can be reduced.

Further, since the guide portion 23a is formed at the tip of the protective ring 23, the body 2 and the protective ring 2 are formed.
The contact with 3 is improved, the space 24 can be shielded more reliably, and the vent hole 9 can be protected.

The present invention is not limited to the above-mentioned embodiments, but can be carried out as follows with appropriate modifications without departing from the spirit of the invention. (1) In the above-described embodiment, the diaphragm 4 may be replaced with a connector connected to a pressure switch for detecting pressure with a pressure sensor made of a semiconductor.

(2) In the above embodiment, the connector 21 and the pressure switch 1 may be connected by engaging the engaging portion with the protective ring 23 and the body 2. in this case,
For example, a protrusion is provided as an engaging portion at the tip of the protection ring 23, and a recess is provided as an engaging portion in the body 2, and the pressure switch 1 and the connector 21 are connected by the engagement of the protrusion and the recess. . In this case, since the protection ring 23 and the body 2 are connected, the degree of shielding by the protection ring 23 can be improved.

The technical ideas other than the claims which can be understood from the above-described embodiments will be described below together with their effects. (1) In the invention according to claim 3, a connector for a pressure switch in which a guide portion 29a is formed at the tip of the protection ring 29. With this connector, the protection ring 2 can be more reliably
It can be shielded by 9, and the vent hole 9 can be protected.

[0032]

As described above in detail, according to the invention of claim 1, the number of parts for waterproofing / dustproofing can be reduced without impairing the function of dustproofing / waterproofing, and the number of assembly steps can be reduced. Can be reduced.

According to the second aspect of the present invention, ventilation is performed between the space shielded by the protection ring and the ventilation hole, so that dust, water droplets, etc. are less likely to enter, and the dustproof / waterproof function is further enhanced. be able to.

According to the third aspect of the invention, the pressure switch and the pressure switch connector can be easily connected only by engaging the engagement portion of the pressure switch connector with the pressure switch.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state before connecting a pressure sensor and a connector.

FIG. 2 is a partially cutaway cross-sectional view showing a pressure sensor and a connector.

FIG. 3 is an explanatory diagram showing a state before connection of a pressure sensor and a connector in a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pressure switch, 7 ... Atmosphere chamber, 9 ... Vent hole, 21 ... Connector, 21a ... Connector main body, 23 ... Protective ring as a protective member, B ... Engaging claw as an engaging part.

Claims (3)

[Claims] 1. A pressure switch connector, which is connected to a pressure switch and transmits a signal from the pressure switch, comprising a protective member for protecting a vent hole for communicating an atmosphere chamber formed in the pressure switch with outside air. A pressure switch connector integrally molded with the connector body. 2. The pressure switch connector according to claim 1, wherein the protection member is a protection ring that covers the periphery of the pressure switch. 3. The pressure according to claim 1, wherein the connector main body is provided with an engagement portion capable of engaging with the pressure switch, and the engagement portion engages with the pressure switch when connected to the pressure switch. Switch connector.