KR102277840B1 - Pressure sensor - Google Patents

Abstract

The present invention relates to a pressure sensor. In the pressure sensor of the present invention, the housing 10 forms an external appearance. The housing body 12 forms the skeleton of the housing 10 , and an internal space 14 is formed inside the housing 10 . The substrate 60 on which the sensing element 62 is mounted is installed in the inner space 14 . There is a fluid flow path 16 to communicate the sensing element 62 with a desired space. The fluid flow path 16 communicates the internal space 14 of the housing 10 with the outside, that is, a desired space. In order to prevent pressure leakage in the fluid flow path 16 , the external gasket 40 and the internal gasket (50) is provided integrally with the housing body (12). The outer gasket 40 and the inner gasket 50 are integrated with each other. The outer gasket 40 prevents pressure leakage between the outer surface of the housing body 12 and the fixed part where the pressure sensor is installed. The inner gasket 50 prevents leakage between the fluid passage 16 and the sensing element 62 . According to the present invention, the number of parts of the pressure sensor is minimized, the loss of the outer gasket 40 and the inner gasket 50 is prevented, and a repulsive force caused by the outer gasket 40 does not occur.

Description

pressure sensor

The present invention relates to a pressure sensor, and more particularly, to a pressure sensor that is mounted on a fixed part and detects a pressure change due to an impact applied to the fixed part.

2. Description of the Related Art Recently, various sensors are used in automobiles to detect situations around the automobile. For example, there is a pressure sensor that detects an impact applied to a vehicle as a change in pressure and provides data for taking a necessary action. This is to provide data for the operation of airbags to protect the driver and passengers.

Here, there is a fluid flow path connected to the sensing element in order to sense the impact generated in the vehicle as a pressure change. In order to transmit the pressure of the fluid to the sensing element without leaking from the fluid passage, an elastic gasket or seal is used.

However, in the conventional pressure sensor, a configuration for preventing leakage is separately made on the inlet side and the outlet side of the fluid passage. Therefore, the number of parts increases as a whole, and in particular, a double-sided tape is used to fix the leak-preventing configuration installed on the outer surface of the pressure sensor, but there is a problem in that the attachment state is damaged by external force.

And, in the prior art, when the pressure sensor is mounted on a vehicle, the configuration for preventing leakage on the outer surface of the pressure sensor generates a slight repulsive force, and there is also a problem in that the mounting state of the pressure sensor is incomplete.

Republic of Korea Patent Publication No. 10-2005-0009681 Republic of Korea Patent Publication No. 10-2014-0126602

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the related art as described above, and to make an outer gasket and an inner gasket used in a pressure sensor integrally with a housing.

Another object of the present invention is to prevent a repulsive force from being generated when the outer gasket is seated on the surface of the panel.

According to a feature of the present invention for achieving the above object, the present invention is provided with an internal space and a fluid flow path communicating the pressure change of the desired space by communicating the internal space and the desired space, and the housing body is a skeleton a housing forming a housing, a connector part provided on the housing body to perform signal connection between the inside and outside of the housing, and installed on a substrate seated in the inner space of the housing to control the pressure change of the desired space through the fluid flow path A sensing element for detecting and receiving transmission through the housing body, an external gasket made by insert-injecting the housing main body on the outer surface of the housing main body to prevent pressure leakage in the desired space, and on one surface of the sensing element in the inner space of the housing main body It may include an inner gasket integrally formed with the outer gasket to prevent leakage of pressure transmitted to the sensing element by being in close contact with the outer gasket, and the outer gasket is provided with a penetrating bar integrally penetrating the housing body, the penetrating The front end of the bar may be provided with a hook piece that is seated in the hook piece groove on the inner surface of the housing body and is formed to protrude from the outer surface of the through bar.

The outer gasket forms a closed curve and has an inner inclined surface that is seated in close contact with the surface of the fixing part of the vehicle with a predetermined inclination.

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The outer gasket and the inner gasket are connected by a connecting bar. A connecting piece is provided at one end of the inner gasket, and the connecting bar extends from the connecting piece to be connected to the outer gasket.

The inner gasket is made in a shape surrounding the fluid flow path and extends further than the outlet of the fluid flow path to be in close contact with one surface of the sensing element.

Mounting pieces having mounting holes are provided on both sides of the housing body, and are formed to protrude in a direction orthogonal to a direction in which the connector part protrudes.

A pressing rib is formed around the periphery of the mounting hole among the surfaces of one side of the mounting piece, and the pressing rib is formed to be narrower in width toward the tip, and is pressed and compressed when the fastener is fastened.

In the pressure sensor according to the present invention, the following effects can be obtained.

First, in the present invention, since the outer gasket and the inner gasket are integrally provided with each other and integrally with the housing body, it is possible to obtain the effect of reducing the number of parts as a whole, and it is possible to prevent the outer gasket or the inner gasket from falling out during the assembly process. It has the effect of minimizing the defect rate.

And, in the present invention, the inner inclined surface of the outer gasket is seated on the fixing part of the vehicle is configured to be in close contact. Therefore, since the external gasket is seated on the fixing part of the vehicle to prevent leakage and not to create a repulsive force, the installation state of the pressure sensor becomes more stable, so that data acquisition by the pressure sensor is accurate.

1 is a perspective view showing the configuration of a preferred embodiment of the pressure sensor according to the present invention.
Figure 2 is a perspective view of the embodiment shown in Figure 1 viewed from another direction.
3 is an exploded perspective view showing the configuration of an embodiment of the present invention;
Figure 4 is a perspective view showing the inside of the housing constituting the embodiment of the present invention.
Figure 5 is a perspective view showing a state in which there is no inner gasket in the housing constituting the embodiment of the present invention.
Figure 6 is a perspective view showing a state in which there is no external gasket in the housing constituting the embodiment of the present invention.
7 is a perspective view showing the configuration of the inner gasket and the outer gasket constituting the embodiment of the present invention.
Fig. 8 is a front view showing the configuration of a housing constituting an embodiment of the present invention from the front;

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and the essence, order, or order of the component is not limited by the term. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

As shown in the drawings, the housing 10 forms the exterior of the embodiment of the present invention. The housing body 12 forms the skeleton of the housing 10 . The housing body 12 is made of an insulating synthetic resin. An inner space 14 is formed inside the housing body 12 , and the inner space 14 is opened to one side of the housing body 12 . The open inner space 14 is shielded by a cover 58 to be described below.

A fluid flow path 16 is formed to communicate the inner space 14 of the housing body 12 with the outside. The fluid flow path 16 is formed in a cylindrical shape in the inner space 14 . An inlet hood 17 is provided on the outer surface of the housing body 12 connected to the fluid flow path 16 . The inlet hood 17 is formed to protrude from the outer surface of the housing body 12 and is opened to one side to have an inlet 18 of the fluid passage 16 . The fluid is transferred to the fluid passage 16 through the inlet 18 so that a pressure change can be detected by a sensing element 62 to be described below. The outlet 20 of the fluid passage 16 is in the inner space 14 . A sensing element 62 to be described below is located at the outlet 20 .

On the other hand, a plurality of through-holes 22 are formed in the housing body 12 to communicate with the inner space 14 and the outside. A through bar 46 or a connecting bar 56 of the outer gasket 40 to be described below is positioned in the through hole 22 . An outer gasket groove 24 surrounding the periphery of the inlet hood 17 is formed on the outer surface of the housing body 12 . The outer gasket groove 24 is formed as a groove slightly lower than the surface of the housing body 12, and is a portion in which the outer gasket 40, which will be described below, is positioned by insert injection.

A hook piece groove 26 is formed around the through hole 22 in the inner space 14 . The hook piece groove 26 is formed on the surface of the inner space 14 , and a hook piece 48 to be described below is located in the hook piece groove 26 . The hook piece groove 26 is made in a circular shape in this embodiment, which may be made in various shapes. For example, a rectangular shape.

In addition to the hook piece groove 26 , an inner gasket groove 28 is formed on the surface of the inner space 14 . The inner gasket groove 28 is formed around the periphery of the fluid passage 16 . A connecting bar 56 to be described below is positioned in the through hole 22 that is opened into the inner gasket groove 28 .

There are mounting pieces 30 extending to both sides of the housing body 12 . The mounting piece 30 is for fixing the housing 10 to a fixing part of a vehicle, for example, a panel. A mounting hole 32 is formed through the mounting piece 30 . In the mounting piece 30 , there is a pressing rib 34 surrounding the mounting hole 32 on a surface opposite to the part to be seated on the panel. The pressing rib 34 has a triangular cross-sectional shape and is pressed by a fastener for mounting the housing 10 . The pressing rib 34 is made to become narrower toward the tip when viewed in cross section. The pressing rib 34 is compressed to some extent while being pressed by a fastener, for example, a head of a bolt or a nut.

The connector part 36 is formed to protrude from the housing body 12 so as to be perpendicular to the direction in which the mounting piece 30 protrudes. A mating connector (not shown) is coupled to the connector part 36 to transmit power or a signal. A terminal 38 is provided inside the connector part 36 . One end of the terminal 38 is inside the connector part 36, and the other end is mounted on a board 60 to be described below.

An outer gasket 40 is provided on the outer surface of the housing body 12 . The outer gasket 40 is located in the outer gasket groove 24 . The outer gasket 40 is integral with the inner gasket 50 to be described below, and is integrally formed by insert injection into the housing body 12 . Of course, the material of the outer gasket 40 is different from that of the housing body 12, and the outer gasket 40 or the inner gasket 50 is made of a material having relatively good elasticity.

The outer gasket 40 is positioned around the inlet hood 17 and serves to transmit the pressure of the fluid in the fluid passage 16 without leakage. That is, the fixed part is closely attached to the surface of the panel so that the pressure of the fluid is not leaked and the pressure of the fluid is transmitted to the fluid passage 16 through the inlet 18 .

A cross section of the outer gasket 40 has a right-angled triangle shape. That is, in the outer gasket 40 having a closed curve, the surface constituting the inner side of the closed curve becomes the inner inclined surface 42 and corresponds to the hypotenuse of the right triangle constituting the cross section. In addition, the surface constituting the outer side of the closed curve is formed orthogonal to the surface of the housing body 12 as the outer surface 44 . Due to the characteristics of the shape of the outer gasket 40, the inner inclined surface 42 is mainly seated on the surface of the panel, which is a fixed part, to prevent leakage. The width of the cross-section of the outer gasket 40 becomes narrower toward the tip. Due to the inclination of the inner inclined surface 42, the inner inclined surface 42 comes into contact with the fixed part of the panel to prevent leakage. Due to the structural characteristics of the external gasket 40 as described above, when the external gasket 40 is mounted on a fixed part, it can perform a function of preventing leakage without generating a repulsive force.

A plurality of through bars 46 are formed in the outer gasket 40 . The through bar 46 is formed to be positioned in the through hole 22 . A hook piece 48 is formed at the tip of the through bar 46 . The hook piece 48 is positioned in the hook piece groove 26 . The hook piece 48 is formed to protrude from the outer surface of the through bar 46 , so that the hook piece 48 cannot escape through the through hole 22 . In this way, the outer gasket 40 is fixed without being separated from the housing body 12 by the hook piece 48 being hooked on the inside of the housing body 12 . For this purpose, a plurality of the through bar 46 and the hook piece 48 are provided.

The inner gasket 50 is formed to surround the fluid passage 16 , and is formed to surround the edge of the outlet 20 of the fluid passage 16 . The inner gasket 50 is made of the same material as the outer gasket 40 . The inner gasket 50 prevents pressure leakage between the fluid passage 16 and the sensing element 62 to be described below.

Since the inner gasket 50 has a shape surrounding the fluid passage 16 , it has a cylindrical shape in this embodiment. A through hole 52 in which the fluid passage 16 is located is formed in the inner gasket 50 . The tip of the inner gasket 50 is formed to extend slightly more than the outlet 20 of the fluid passage 16 .

The inner gasket 50 is connected to the outer gasket 40 to be integrally formed. To this end, a connecting piece 54 is integrally formed on both ends of one end of the inner gasket 50 , and a connecting bar 56 connects the connecting piece 54 and the outer gasket 40 to each other. Of course, the outer gasket 40 and the inner gasket 50 may be directly connected by the connecting bar 56 without the connecting piece 54 . The connecting piece 54 is formed in the inner gasket groove 28 .

A plurality of reinforcing ribs 57 are formed on the outer surface of the inner gasket 50 in the longitudinal direction. In this embodiment, four reinforcing ribs 57 are formed at regular intervals.

The inner space 14 of the housing body 12 is shielded by a cover 58 . The cover 58 is installed on the housing body 12 to shield the entrance of the inner space 14 . Various structures may be employed for the cover 58 to be mounted and fixed to the housing body 12 . For example, a structure in which the cover 58 is mounted to the housing body 12 or press-fitted through fusion may be utilized.

A substrate 60 is installed in the inner space 14 . The board 60 is a printed circuit board on which the terminal 38 is mounted and the sensing element 62 is mounted thereon. The sensing element 62 performs a function of sensing pressure. In a state in which the sensing element 62 is mounted on the substrate 60, one surface of the sensing element 62 is in close contact with the tip of the inner gasket 50 so that the sensing part of the sensing element 62 communicates with the fluid passage 16 and leaks. to prevent this from happening.

Hereinafter, the manufacturing and use of the pressure sensor according to the present invention having the configuration as described above will be described in detail.

In the pressure sensor of the present invention, after the housing body 12 constituting the housing 10 is injection molded, the housing body 12 is put back into the mold and the outer gasket 40 and the inner gasket ( 50) is integrally formed with the housing body 12. While the outer gasket 40 and the inner gasket 50 are integrally molded into the housing body 12 , the hook piece 48 is in the hook piece groove 26 , and the outer gasket is formed by the connecting bar 56 . As the 40 and the inner gasket 50 are connected to each other, the outer gasket 40 and the inner gasket 50 are firmly fixed so as not to be separated from the housing body 12 .

As described above, in a state in which the outer gasket 40 and the inner gasket 50 are integrally formed with the housing body 12, the substrate 60 on which the sensing element 62 is mounted in the inner space 14 of the housing 10. to install Then, the inner space 14 is shielded from the outside by the cover 58 .

The assembled pressure sensor is mounted to the fixing part by fixing the mounting piece 30 of the housing 10 to the panel, which is the fixing part of the vehicle, by means of a fastener. When the fastener is fastened to the fixing part through the mounting hole 32 of the mounting piece 30, the pressing rib 34 is pressed by the fastener and is securely mounted while being slightly crushed. In this way, the inlet hood 17 of the housing 10 is located in the space to measure the pressure.

At this time, the outer gasket 40 serves to prevent communication between the space and the outside. In particular, the outer gasket 40 is in close contact with the inner inclined surface 42 thereof in contact with the panel. Therefore, since the outer gasket 40 is placed on the fixed part of the vehicle and is in close contact, the repulsive force is not applied to the housing body 12 .

The connector part 36 of the pressure sensor is coupled to a mating connector connected to the control unit of the vehicle. When a counterpart connector is mounted on the connector part 36 and the pressure sensor is connected to the control unit, the pressure sensor is in a state capable of detecting a pressure change.

As such, when the pressure sensor is mounted on the fixed part of the vehicle and an external impact acts on the part corresponding to the vehicle, the pressure in the space communicating with the fluid flow path 16 changes, and the pressure change is applied to the fluid flow path ( 16) is transmitted to the sensing element 62 and sensed. The pressure change sensed through the sensing element 62 is transmitted to the control unit through the counterpart connector and used for subsequent operation.

Meanwhile, in the pressure sensor of the present invention, the outer gasket 40 and the inner gasket 50 are integrated, and the outer gasket 40 and the inner gasket 50 are integrated with the housing body 12 . Accordingly, there is no concern that the operator assembles the pressure sensor in a state in which the outer gasket 40 or the inner gasket 50 is omitted, and the number of parts is reduced as a whole.

And, the pressing rib 34 of the mounting piece 30 is slightly compressed by the fastener, so that there is no need to put a separate part between the fastener and the mounting piece 30, and the pressure sensor is It is more tightly coupled to the fixed part of the

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

For reference, the mounting piece 30 may be removed and the housing 10 may be fixed to the fixing part of the vehicle by using a double-sided tape or a physical structure instead.

Also, the cover 58 may be viewed as an element constituting the housing 10 . For example, the cover 58 may be integrally connected to the housing body 12 through a mold hinge.

Although the outer surface 44 of the outer gasket 40 is orthogonal to the surface of the housing body 12 in the illustrated embodiment, this is not necessarily the case. For example, an acute angle may be formed between the surface of the housing body 12 and the outer surface 44 .

10: housing 12: housing body
14: inner space 16: fluid flow path
17: entrance hood 18: entrance
20: exit 22: through hole
24: outer gasket groove 26: hook side groove
28: inner gasket groove 30: mounting piece
32: mounting hole 34: pressing rib
36: connector part 38: terminal
40: outer gasket 42: inner inclined surface
44: outer side 46: through bar
48: hook piece 50: inner gasket
52: through hole 54: connecting flight
56: connecting bar 57: reinforcing rib
58: cover 60: substrate
62: sensing element

Claims (7)

a housing having an internal space and communicating with the internal space to communicate a pressure change in the desired space, the housing body forming a skeleton;
a connector part provided in the housing body to perform signal connection between the inside and outside of the housing;
a sensing element installed on a substrate seated in the inner space of the housing to receive and detect a pressure change in the desired space through the fluid flow path;
an external gasket made by insert-injecting the housing body into the outer surface of the housing body to prevent pressure leakage in the desired space;
and an inner gasket that is in close contact with one surface of the sensing element in the inner space of the housing body to prevent the pressure transmitted to the sensing element from leaking and is integrally formed with the outer gasket,
The outer gasket is provided with a through bar integrally passing through the housing body, and the tip of the through bar is seated in a hook piece groove on the inner surface of the inner space of the housing body and is formed to protrude from the outer surface of the through bar A pressure sensor is provided.
The pressure sensor according to claim 1, wherein the outer gasket forms a closed curve and has an inner inclined surface that is seated in close contact with the surface of the fixing part of the vehicle with a predetermined inclination.
delete The pressure sensor according to claim 2, wherein the outer gasket and the inner gasket are connected by a connecting bar. A connecting piece is provided at one end of the inner gasket and the connecting bar extends from the connecting piece to be connected to the outer gasket.
[Claim 5] The pressure sensor of claim 4, wherein the inner gasket has a shape surrounding the fluid flow path and extends further than the outlet of the fluid flow path to be in close contact with one surface of the sensing element.
[Claim 6] The method of any one of claims 1, 2, 4, and 5, wherein mounting pieces having mounting holes are provided on both sides of the housing body, and protruding in a direction orthogonal to a direction in which the connector part protrudes. pressure sensor.
[Claim 7] The pressure sensor according to claim 6, wherein a pressing rib is formed around the periphery of the mounting hole on one surface of the mounting piece, and the pressing rib is formed to become narrower in width toward the tip, and is pressed and compressed when the fastener is fastened.

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