JP2010243428A - Fluid pressure measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid pressure measuring apparatus capable of easily positioning a control substrate and a probe and easily executing assembly work even with the presence of errors when a plurality of parts are to be assembled. <P>SOLUTION: In the fluid pressure measuring apparatus, a joint 1 is provided with a detection part 2. The control substrate 6 for controlling signals detected by the detection part 2 is mounted to a spacer 7. The spacer 7 is mounted to the joint 1. A holder 4 is supported by the spacer 7. The holder 4 is freely retractably provided with the probe 5 electrically connected to the control substrate 6. A tubular case 3 having a shoulder part 32 for preventing the coming-off of the holder 4 is fixed to the joint 1. An elastic gasket 8 is provided between the case 3 and the holder 4. Even with the presence of size errors in the case 3, a serially connected joint 1, the spacer 7 and the holder 4, the elastic gasket 8 provided for the case 3 and interposed between the shoulder part 32 and the holder 4 is elastically deformed according to size errors accumulated by the spacer 7, the holder 4, etc. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluid pressure measuring device, for example, a fluid pressure measuring device for a brake device.

  Brake systems are installed in automobiles and other vehicles. As a brake device used in this brake system, a pressure sensor for measuring a brake pressure and a control electronic device for evaluating a measured value are provided, and the control electronic device is attached to a casing that covers the pressure sensor. The electrical connection between the pressure sensor and the control electronics is made by a spring contact pin, one end of this spring contact pin is pressed and supported by the contact surface on the pressure sensor side, and the other end of the spring contact pin is controlled There is a conventional example that is pressed and supported by a contact surface on the electronic device side (Patent Document 1).

In the brake device disclosed in Patent Document 1, a spring contact pin is inserted into a guide formed on an insulating member, and the insulating member is fixed by caulking in a bottomed cylindrical capsule that concentrically surrounds the pressure sensor. ing.
The open end of the capsule is fixed to the flange of the pressure sensor, and an injection molding part is attached to this flange, and this injection molding part is formed on the printed wiring board on which the pressure sensor side contact surface is formed. Connected through.

Japanese translation of PCT publication No. 2002-542107

In the conventional example shown in Patent Document 1, since the insulating member is fixed to the capsule by caulking, in order to assemble the measuring device, first, the spring contact pin is inserted into the insulating member, and the insulating member is accommodated in the capsule. The capsule and the insulating member are caulked and the capsule is fixed to the pressure sensor. On the other hand, the flange of the pressure sensor, the injection molding part, the receiving needle-like part and the printed wiring board are assembled in series.
However, these members are not necessarily manufactured as designed, and if this error exists for each member, the error will be accumulated when these members are assembled. As a result, the positioning of the contact surface of the printed wiring board and the spring contact pin becomes complicated with such an assembly error.

  An object of the present invention is to provide a fluid pressure measuring device that can easily perform the assembly work by easily positioning the control board and the probe even if there is an assembly error when assembling a plurality of parts. .

  The fluid pressure measurement device of the present invention includes a joint in which an introduction hole for introducing a fluid to be detected is formed, a detection unit that is provided in the joint and detects the pressure of the introduced fluid, and is detected by the detection unit. A control board for controlling the signal, a spacer attached to the control board and supported by the joint, a holder supported by the spacer, and a holder that can be moved forward and backward, and electrically connected to the control board. And a cylindrical case in which a retaining portion for retaining the holder is formed at one end and the other end is fixed to the joint, and an elasticity provided between the case and the holder And a gasket.

In the present invention having this configuration, a spacer is supported by a joint provided with a detection unit in advance, and a control board is attached to the spacer. Further, the probe is provided on the holder, and the holder is supported by the spacer so that the probe and the control board are electrically connected. Then, the case is pressed against the joint in a state where the elastic gasket is disposed between the holder and the retaining portion of the case, and the fluid pressure measuring device is assembled by fixing the end of the case to the joint.
Therefore, in the present invention, there are errors in the case, the joint connected in series, the spacer, and the holder, and even if these errors are accumulated, an elastic gasket is provided between the retaining portion of the case and the holder. Since it is interposed, the elastic gasket is elastically deformed according to the accumulated error.
Therefore, in the present invention, even if there is an error in the case, joint, spacer, and holder, the elastic gasket absorbs the error during assembly, and the relative position between the control board and the probe does not change. Work can be done easily.

Here, in the present invention, it is preferable that the spacer includes an end surface portion that supports the holder and a step portion that is disposed adjacent to the end surface portion.
In the present invention having this configuration, the spacer and the holder can be easily positioned by forming a step in the spacer.

The holder preferably has a configuration in which the length of the portion supported by the end surface portion is different from the length of the portion supported by the step portion.
In the present invention having this configuration, since the holders are partially different in length, it is possible to prevent an error in the mounting posture of the holder.

Preferably, the case includes a cylindrical main body and a shoulder formed by bending from one end of the cylindrical main body toward the axial center, and the shoulder is the retaining portion.
In the present invention having this configuration, since the elastic gasket is interposed between the holder inserted into the cylindrical main body and the shoulder, the assembly error in the axial direction between the holder and the case is absorbed by the elastic gasket. As a result, the assembly work of the entire apparatus becomes easy.

The control board includes a first board disposed close to the detection unit and a second board that contacts the tip of the probe, and the first board and the second board are electrically connected to each other by a conductive pin. In addition, a configuration that is positioned at a predetermined interval is preferable.
In the present invention having this configuration, the control board is divided into the first board and the second board, and these are arranged along the axial direction of the case, so that the apparatus can be downsized in the radial direction of the case. Can do. Therefore, it becomes possible to install the fluid pressure measuring device on the attached portion having a small area. In addition, since the first substrate and the second substrate are energized to each other with the conductive pins, the two substrates can be effectively used as the control substrate.

Preferably, the holder is provided with a ground terminal connected to the control board.
In the present invention having this configuration, since the control board can be grounded through the ground terminal, noise from the wiring can be released to the ground, and noise resistance can be improved.
On the other hand, in the present invention, it is possible to adopt a configuration in which the spacer is made of metal and is electrically connected to the joint, and the spacer and the control board are electrically connected.
In this invention of this structure, noise resistance can be improved without providing a ground terminal.

Sectional drawing of the fluid pressure measuring device concerning one Embodiment of this invention. The perspective view which fractured | ruptured a part of fluid pressure measuring device concerning the said embodiment. (A) is a perspective view which shows the holder with which the 2nd board | substrate was attached, (B) is the side view. The perspective view of a case. (A) is a perspective view which shows the spacer with which the 1st board | substrate was attached, (B) is the side view. The perspective view of a 2nd board | substrate. (A) is a perspective view which shows a ground terminal, (B) is a perspective view of the holder to which the ground terminal was attached. Sectional drawing of the fluid pressure measuring device concerning the modification of this invention.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a fluid pressure measuring device according to the present embodiment, and FIG. 2 is a perspective view with a part thereof broken.
1 and 2, the present embodiment is a fluid measuring device used in a brake device for automobiles and other vehicles.
The fluid measuring device includes a joint 1 installed in a mounted portion of a brake device, a detection unit 2 provided in the joint 1, a substantially cylindrical shape that covers the detection unit 2 and has an open end joined to the joint 1. The case 3, the holder 4 disposed so that a part of the case 3 is exposed, the four probes 5 provided in the holder 4 so as to be able to advance and retreat, and the probes 5 are electrically connected. A control board 6 having a first board 61 and a second board 62, a spacer 7 for attaching the control board 6, an elastic gasket 8 provided between the case 3 and the holder 4, and a ground terminal provided on the holder 4 9.

The joint 1 includes a shaft portion 11 in which an introduction hole 1A for introducing a fluid to be detected is formed, and a flange portion 12 formed to extend in the radial direction from the central portion of the shaft portion 11. The shaft portion 11 has a structure in which one end portion is attached to an attached portion (not shown) by an O-ring seal, press-fitting, or the like, and the other end portion is a step portion joined to the detection unit 2.
In the detection unit 2, a cylindrical part 21 joined to the other end of the joint 1 by welding or the like, and a disk-shaped diaphragm part 22 formed on one end side of the cylindrical part 21 are integrally formed. The diaphragm portion 22 is provided with a strain gauge or the like (not shown) to detect the pressure of the introduced fluid.

The case 3 is a metal member that includes a cylindrical main body 31 and a shoulder portion 32 that is bent from one end of the cylindrical main body 31 toward the axial center. The shoulder portion 32 prevents the holder 4 from coming off. It is used as a retaining part.
The other end of the cylindrical main body 31 is joined to an engaging step 12 </ b> A formed on the flange portion 12 of the joint 1.

The structure of the holder 4 is shown in FIG.
In FIG. 3, the holder 4 is a synthetic resin part that includes a support portion 41 and a holding portion 42 that is formed integrally with the support portion 41 and holds the probe 5.
The support portion 41 has a structure in which one end portions of the first support portion 411 and the second support portion 412 are joined to the disc-like portion 413, and the first support portion 411 sandwiches the center of the disc-like portion 413. Two places are formed. The first support portion 411 is supported by the spacer 7.
The second support portion 412 is formed at two positions across the center of the disk-shaped portion 413 at a position where the first support portion 411 is not formed. The first support part 411 and the second support part 412 are arranged at a predetermined distance from each other.

As for the cross section along the radial direction, the two 1st support parts 411 are formed in the outer side in circular arc shape, and the inner side is formed in linear form, respectively. A protrusion 411A is formed inside the first support portion 411. One of the two first support portions 411 is longer in the axial direction than the other.
As for the cross section along the radial direction of the 2nd support part 412, the inner side and the outer side are each formed in circular arc shape. The second support portion 412 is formed with a rectangular window 412A. A claw portion 412B for locking the second substrate 62 is formed in the second support portion 412 in the vicinity of the window 412A.
The holding portion 42 is formed in a substantially columnar shape, and its outer dimension is smaller than the inner periphery of the shoulder portion 32 of the case 3, and most of the portion protrudes from the case 3. A guide hole 42A for inserting the probe 5 is formed in the holding portion 42 along the axial direction of the holder 4, and the guide hole 42A has a step 42B for preventing the probe 5 from coming off. Is formed.

The planar shape of the holding portion 42 is obtained by forming a linear notch in a part of a circle, and the planar shape of the shoulder portion 32 of the case 3 is formed in accordance with the planar shape (see FIG. 2 and FIG. 2). (See FIG. 4). That is, the inner peripheral shape of the shoulder portion 32 is formed by an arc portion and a straight portion.
The outer peripheral dimension of the support part 41 is formed larger than the outer peripheral dimension of the holding part 42, and therefore, a stepped part 4 </ b> A is formed at the connection part between the support part 41 and the holding part 42.
A ring-shaped elastic gasket 8 is interposed between the stepped portion 4 </ b> A and the shoulder portion 32 of the case 3.

As shown in FIGS. 1 and 2, the probe 5 is housed between a large-diameter portion 51 and a small-diameter portion 52 each having a bottomed cylindrical shape with one end opened, and between the large-diameter portion 51 and the small-diameter portion 52. A capsule-like conductive member provided with a coil spring 53.
The outer periphery of the large diameter portion 51 is slidable in the guide hole 42A of the holder 4, and the step portion 51A of the large diameter portion 51 can be locked to the step 42B formed in the middle of the guide hole 42A. .
The outer peripheral portion of the small diameter portion 52 is slidably provided on the inner peripheral portion of the large diameter portion 51. A claw portion 51 </ b> B for preventing the small diameter portion 52 from coming off is formed at the opening end of the large diameter portion 51.
The tip of the small diameter portion 52 is brought into contact with the second substrate 62 by the biasing force of the coil spring 53.

The control board 6 controls a signal detected by the detection unit 2, the first board 61 constituting the control board 6 is disposed in proximity to the detection unit 2, and the second board 62 is connected to the first board 61. Oppositely arranged at a predetermined interval, and has a surface with which the tip of the probe 5 abuts.
The first substrate 61 and the second substrate 62 are energized with each other via a plurality of (three shown in FIG. 1) conductive pins 63.
These conductive pins 63 have bulging portions for positioning the first substrate 61 and the second substrate 62 at both ends thereof.

The configuration of the first substrate 61 is shown in FIG. 5A is a perspective view showing a spacer to which the first substrate is attached, and FIG. 5B is a side view thereof.
In FIG. 5, the first substrate 61 is a substantially disk-shaped member having straight portions 61 </ b> A formed at positions facing each other and an arc portion 61 </ b> B connecting the ends of the straight portions 61 </ b> A. A circular window 61C for exposing the diaphragm portion 22 of the detection unit 2 is formed at the center of the first substrate 61, and one end of the conductive pin 63 is press-fitted or positioned at a position facing each other across the window 61C. A total of six through-holes 64 that are electrically connected by soldering are formed. A positioning hole 61D for positioning with the spacer 7 is formed in the peripheral portion of the first substrate 61 at a position facing each other across the window 61C.
A plurality of Au pads 65 are formed on the first substrate 61, and the Au pads 65 and the Au pads 23 formed on the surface of the diaphragm portion 22 are electrically connected by wire bonding. The material of the bonding wire may be Au or Al.

In FIG. 3, the second substrate 62 includes a linear portion 62 </ b> A that contacts the inner flat surface portion of the first support portion 411, and ends of these linear portions 62 </ b> A and the inner arc surface of the second support portion 412. It is a substantially disk-shaped member having an arc portion 62B that abuts. The second substrate 62 is prevented from rotating by the linear portion 62A of the second substrate 62 coming into contact with the inner plane portion of the first support portion 411. The straight portion 62 </ b> A has a recess 62 </ b> C that engages with the protrusion 411 </ b> A of the holder 4. Protrusions 411B that support the corners of the linear part 62A are formed on the first support part 411.
A large electronic component 6A is provided at the center of the second substrate 62, and a plurality of small electronic components 6B are arranged around the electronic component 6A.
A plurality of through holes 64 in which the other end portions of the conductive pins 63 are electrically connected by press-fitting or soldering are arranged in two rows at positions facing each other across the large electronic component 6A of the second substrate 62. Are arranged.

FIG. 6 is a perspective view of the second substrate 62 as viewed from the surface in contact with the probe 5, and the second substrate 62 is viewed from the surface opposite to the surface of the second substrate 62 shown in FIG. 3.
In FIG. 6, a plurality of electronic components 6 </ b> C are arranged on the second substrate 62, and a contact pad 66 that contacts the distal end portion of the probe 5 apart from the arrangement position of these electronic components 6 </ b> C is formed. A ground pad 67 is formed apart from the component 6C.

1, 2, and 5, the spacer 7 has a substantially disc-shaped end surface portion 7 </ b> A to which the first substrate 61 is fixed, and one end portion is provided on the outer peripheral edge portion of the end surface portion 7 </ b> A and the joint 1 It is a metal cap-like member having a cylindrical part 7B to be supported and a step part 7C provided between the cylindrical part 7B and the end face part 7A.
A projection 7A1 that engages with a positioning hole 61D formed in the first substrate 61 is formed on the end surface portion 7A. The end surface portion 7A and the first substrate 61 may be fixed by soldering the protrusion 7A1 and the positioning hole 61D, providing a pad on the lower surface of the first substrate 61, applying a solder paste or a conductive adhesive, and reflowing. It may be electrically connected to the spacer 7 by treatment or heat treatment. Since the first substrate 61 and the spacer 7 are electrically connected and can be grounded, in this case, the ground terminal 9 can be dispensed with.

The cylindrical portion 7 </ b> B has a cylindrical shape whose outer peripheral edge substantially coincides with the outer peripheral edge of the first substrate 61. The cylindrical portion 7B is fixed by laser welding with an open end engaged with an engaging step 12A formed on the flange portion 12 of the joint 1.
The stepped portion 7C has a plane portion 7C1 that is a plane orthogonal to the axis of the cylindrical portion 7B and a vertical portion 7C2 that is orthogonal to the plane portion 7C1. The flat surface portion 7C1 has a region composed of a straight line in contact with the vertical portion 7C2 and an arc in contact with the outer periphery of the cylindrical portion 7B, and the edge portion of the first support portion 411 having a long length is supported. .
The vertical portion 7C2 is formed so that the position on the plane coincides with the straight portion 61A of the first substrate 61, and the vertical portion 7C2 faces the inner plane portion of the first support portion 411 having a long length.
At a position facing the stepped portion 7C across the center of the end surface portion 7A, there is a region exposed from the straight portion 61A of the first substrate 61, and this region has a short length of the first support portion 411. The edge is supported.

As shown in FIGS. 1 and 2, the elastic gasket 8 is formed in a ring shape, the inner diameter dimension thereof is substantially the same as the outer circumference dimension of the holding portion 42, and the outer diameter dimension thereof is the cylindrical main body 31 of the case 3. Is substantially the same as the inner diameter dimension of. The cross-sectional shape of the elastic gasket 8 is a substantially rectangular shape. The outer peripheral side corner of the elastic gasket 8 is formed so as to fit the inner peripheral surface of the cylindrical main body 31 of the case 3 and the shoulder 32.
As the elastic gasket 8, various materials such as rubber can be adopted as long as they are elastically deformable.

A specific structure of the ground terminal 9 is shown in FIG.
FIG. 7A is a perspective view of the ground terminal 9, and FIG. 7B is a perspective view showing a state in which the ground terminal 9 is attached to the holder 4.
In FIG. 7, the ground terminal 9 includes a flat plate portion 9 </ b> A disposed to face the inner surface of the holding portion 42 of the holder 4, and a plurality of wing-like portions 9 </ b> B provided on the flat plate portion 9 </ b> A so as to be bent. It is a metal plate.
An engagement hole 9A1 that engages with an engagement protrusion 42C formed on the inner surface of the holding portion 42 is formed at the center of the flat plate portion 9A, and the probe 5 is inserted around the engagement hole 9A1. A hole 9A2 is formed. The insertion hole 9A2 has a circular shape larger than the outer diameter of the probe 5 so as not to interfere with the probe 5. The flat plate portion 9A may be bonded and fixed to the holding portion 42 with an adhesive if necessary.
A part of the plurality of wing portions 9B is bent in a substantially U shape with respect to the flat plate portion 9A, and the rest is bent at a substantially right angle with respect to the flat plate portion 9A. The wing-like portion 9B bent into a substantially U shape has a wing-like portion 9B bent at a substantially right angle, with the bent tip portion 9B1 contacting the ground pad 67 of the second substrate 62. When the tip end portion 9B2 comes into contact with the inner peripheral portion of the case 3, the control board 6 can be grounded.

A procedure for assembling the fluid pressure measuring device of this embodiment will be described.
First, the probe 5 is provided on the holding portion 42 of the holder 4, and the ground terminal 9 is attached to the holding portion 42. On the other hand, the detector 2 is joined to the joint 1 by welding, and a spacer 7 is attached to the joint 1, and a first substrate 61 is attached to the spacer 7. In this state, the diaphragm portion 22 of the detection unit 2 is exposed from the window 61 </ b> C of the first substrate 61.
Then, an Au pad 65 provided in advance on the first substrate 61 and an Au pad 23 provided in advance on the diaphragm portion 22 are wire-bonded, and one end portions of a plurality of conductive pins 63 are attached to the first substrate 61. The other end of the conductive pin 63 is attached to the second substrate 62. Note that the conductive pins 63 are attached to the first substrate 61 and the second substrate 62 by an appropriate means such as press fitting or soldering.

The two first support portions 411 of the holder 4 are supported on the end surface portion 7A and the stepped portion 7C of the spacer 7 so as to accommodate the first substrate 61 and the second substrate 62, respectively. As a result, the tip of the probe 5 comes into contact with the contact pad 66 of the second substrate 62, and the tip 9B1 of the wing portion 9B of the ground terminal 9 comes into contact with the ground pad 67 of the second substrate 62. Become.
Thereafter, the elastic gasket 8 is disposed on the stepped portion 4A of the holder 4, and in this state, the case 3 is pressed toward the joint 1 so as to accommodate the holder 4 and the spacer 7. Thereby, the elastic gasket 8 disposed between the shoulder portion 32 of the case 3 and the stepped portion 4 </ b> A of the holder 4 is elastically deformed, and the open end of the case 3 comes into contact with the joint 1. Further, the open end of the case 3 is fixed to the joint 1 by welding.

Therefore, in the present embodiment, the following operational effects can be achieved.
(1) The detection unit 2 is provided in the joint 1, the control board 6 for controlling the signal detected by the detection unit 2 is attached to the spacer 7, the spacer 7 is attached to the joint 1, and the holder 4 is supported by the spacer 7. The holder 5 is provided with a probe 5 electrically connected to the control board 6 so as to be able to advance and retreat, and a cylindrical case 3 having a shoulder 32 for preventing the holder 4 from being detached is fixed to the joint 1. An elastic gasket 8 is provided between the holder 4 and the holder 4. Therefore, even if there is a dimensional error in the case 3, the joint 1 connected in series, the spacer 7, and the holder 4, the elastic gasket 8 is interposed between the shoulder portion 32 provided in the case 3 and the holder 4. Therefore, the elastic gasket 8 is elastically deformed in accordance with the dimensional error accumulated by the spacer 7 and the holder 4, etc., and the relative position between the control board 6 and the probe 5 does not change, and the assembly is performed. Can be easily performed.

(2) Since the spacer 7 includes the end surface portion 7A for supporting the holder 4 and the step portion 7C disposed adjacent to the end surface portion 7A, the spacer 7 and the holder 4 can be easily positioned. .

(3) Since the holder 4 is different in the length of the first support part 411 supported by the end face part 7A and the first support part 411 supported by the step part 7C, the mounting attitude of the holder 4 to the spacer 7 If this is wrong, the holder 4 is not supported by the spacer 7 at an appropriate position, so that the mistake is immediately identified. Therefore, it is possible to prevent an error in the mounting posture of the holder 4 to the spacer 7 or to correct it immediately even if it is wrong.

(4) Since the case 3 includes the cylindrical main body 31 and the shoulder 32 is formed from one end of the cylindrical main body 31 toward the axial center, the holder 4 inserted into the cylindrical main body 31 and the shoulder The elastic gasket 8 is interposed between them. Therefore, the assembly error in the axial direction between the holder 4 and the case 3 is absorbed by the elastic gasket 8, and the assembly work of the entire apparatus is facilitated.

(5) The control board 6 includes a first board 61 disposed close to the detection unit 2 and a second board 62 that contacts the tip of the probe 5. The first substrate 61 and the second substrate 62 are energized to each other by the conductive pins 63 and are positioned at a predetermined interval. Therefore, since the first substrate 61 and the second substrate 62 are arranged along the axial direction of the case 3, it is possible to reduce the size of the device in the radial direction of the case 3. Therefore, it is possible to install the fluid pressure measuring device on the mounted portion having a small area.

(6) Since the ground terminal 9 connected to the second substrate 62 is attached to the holder 4, the control substrate 6 can be grounded through the ground terminal 9. Therefore, noise from the wiring can be released to the ground, and noise resistance can be improved.
(7) The ground terminal 9 includes a flat plate portion 9A attached to the inner surface of the holding portion 42 of the holder 4 and a plurality of wing-like portions 9B provided on the flat plate portion 9A so as to be foldable. A portion of the shape portion 9B is bent in a substantially U shape with respect to the flat plate portion 9A and comes into contact with the ground pad 67 of the second substrate 62, and the remaining wing shape portion 9B is formed on the inner peripheral portion of the case 3. It was set as the structure which contacts. Therefore, the ground terminal 9 can be made compact to reduce the size of the apparatus.

(8) Since the engagement hole 9A1 that engages with the engagement protrusion 42C formed on the inner surface of the holding portion 42 is formed at the center of the flat plate portion 9A, the positioning of the ground terminal 9 to the holder 4 is easy. As a result, the entire apparatus can be quickly assembled.
(9) Since the inner side surface of the first support portion 411 of the holder 4 is formed in a planar shape in accordance with the linear portion of the second substrate 62, it is possible to prevent the second substrate 62 from rotating with respect to the holder 4.
(10) The holder 4 includes two second support portions 412 at positions facing each other across the center, and the second support portions 412 are respectively formed with claw portions 412B for locking the second substrate 62. Therefore, the movement of the second substrate 62 is restricted between the second support portions 412 arranged to face each other. Therefore, it is possible to prevent the second substrate 62 from falling off the holder 4 during the assembling work.

(11) Since the elastic gasket 8 is disposed in the stepped portion 4A of the holder 4 and has an inner diameter dimension substantially the same as the outer diameter of the holding portion 42 adjacent to the stepped portion 4A, when the holder 4 is stored in the case 3 Since the elastic gasket 8 does not fall off the holder 4 by mistake, the mounting operation can be performed smoothly.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the cross-sectional shape of the elastic gasket 8 is substantially rectangular. However, the present invention is not limited to this, and the cross-sectional shape of the elastic gasket 8 may be a circle, an ellipse, a triangle, or the like as appropriate. It is good also as a simple shape.

In the present invention, it is not always necessary to provide the ground terminal 9. For example, as shown in FIG. 8, the first substrate 61 and the metal spacer 7 are electrically connected, and the metal spacer 7 and the joint 1 are electrically connected, so that the control substrate 6 is connected. Can be grounded. In this configuration, since the ground terminal is unnecessary, the structure of the apparatus can be simplified. And since the earth | ground with the coupling 1 can be taken via the spacer 7, it is not necessary to make the case 3 into a metal material.
Even if the ground terminal 9 is provided as in the embodiment, it is not necessary to provide the ground terminal 9 and the holder 4 separately. For example, the ground terminal 9 may be previously fixed to the holder 4 by insert molding.
In the present invention, the spacer 7 does not necessarily need to be provided with the stepped portion 7C, and may be composed of the end surface portion 7A and the cylindrical portion 7B. Further, the two first support portions of the holder 4 The lengths of 411 may be the same.
Furthermore, in the above embodiment, the control board 6 is composed of the first board 61 and the second board 62, but the number of the control board of the present invention may be one, or three or more. May be. If the control board is formed from one sheet, the conductive pins are not required.

  The present invention can be used for automobiles, brake systems mounted on other vehicles, and other devices.

  DESCRIPTION OF SYMBOLS 1 ... Joint, 1A ... Introduction hole, 2 ... Detection part, 3 ... Case, 4 ... Holder, 4A ... Step part, 5 ... Probe, 6 ... Control board, 7 ... Spacer, 8 ... Elastic gasket, 9 ... Grounding terminal, 32 ... Shoulder (retaining part), 61 ... first substrate, 62 ... second substrate, 63 ... conductive pin

Claims (7)

  A joint in which an introduction hole for introducing a fluid to be detected is formed; a detection unit that is provided in the joint and detects the pressure of the introduced fluid; a control board that controls a signal detected by the detection unit; A spacer that is attached to the control board and supported by the joint, a holder that is supported by the spacer, a probe that is provided in the holder so as to freely move forward and backward, and that is electrically connected to the control board, and a holder that prevents the holder from being detached A cylindrical case in which a retaining portion for forming the one end is formed at one end and the other end is fixed to the joint, and an elastic gasket provided between the case and the holder. A fluid pressure measuring device. The fluid pressure measuring device according to claim 1,
The said spacer has the end surface part which each supports the said holder, and the level | step-difference part arrange | positioned adjacent to this end surface part, The fluid pressure measuring device characterized by the above-mentioned. The fluid pressure measuring device according to claim 2,
In the fluid pressure measuring device, the holder is different in length between a portion supported by the end surface portion and a portion supported by the step portion. In the fluid pressure measuring device according to any one of claims 1 to 3,
The case includes a cylindrical main body and a shoulder formed by bending from one end of the cylindrical main body toward an axial center, and the shoulder is the retaining portion. Pressure measuring device. In the fluid pressure measuring device according to any one of claims 1 to 4,
The control board includes a first board disposed close to the detection unit and a second board that contacts the tip of the probe, and the first board and the second board are electrically connected to each other by a conductive pin. And a fluid pressure measuring device which is positioned at a predetermined interval. In the fluid pressure measuring device according to any one of claims 1 to 5,
The fluid pressure measuring device according to claim 1, wherein a ground terminal connected to the control board is attached to the holder. In the fluid pressure measuring device according to any one of claims 1 to 5,
The fluid pressure measuring device, wherein the spacer is made of metal and is electrically connected to the joint, and the spacer and the control board are electrically connected.

Images