CN214407864U - Sensor unit - Google Patents

Abstract

The utility model provides a sensor unit, it can prevent that excessive effort from being used for the generating line. The sensor unit (1) is used by being provided in a body having a flow path through which a fluid can flow. The sensor unit (1) comprises: a housing (5) having a hollow portion (51); a pressure sensor housed in the hollow portion (51), having a terminal, and detecting the pressure of the fluid passing through the flow path; a plate-shaped bracket for pressing the pressure sensor to the body; and a bus bar (6) electrically connected to the terminal (21), wherein the bus bar (6) has a deformation portion (61), the deformation portion (61) extends in the hollow portion (51) in a direction intersecting the thickness direction of the bracket, is in contact with the terminal, and is formed by bending or meandering deformation of a center line O6 of the bus bar (6). The deformation portion (61) is cantilever-supported by the housing (5).

Description

Sensor unit

Technical Field

The utility model relates to a sensor unit.

Background

A hydraulic control device mounted on a vehicle such as an automobile and performing hydraulic control is known (for example, see patent document 1). The hydraulic control device described in patent document 1 includes: an oil path body having an oil path through which oil flows; and a pressure sensor device having a plurality of pressure sensors for measuring the pressure of the oil flowing through the oil passage, and a bus line linearly connected to each of the pressure sensors.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2018-173278

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

However, in the oil pressure control device described in patent document 1, depending on the magnitude of the oil pressure, the pressure sensor may be displaced and the bus bar may be excessively pressed. At this time, there are the following problems: the bus bar is intended to be bent to relieve stress (internal stress), but as described above, the bus bar is linear and cannot be deformed sufficiently, and as a result, stress is not relieved.

An object of the utility model is to provide a sensor unit, it can prevent that excessive force from acting on the generating line.

[ means for solving problems ]

According to an embodiment of the present invention, a sensor unit is provided in a body having a flow path through which a fluid can pass, the sensor unit including: a housing having a hollow portion; a pressure sensor housed in the hollow portion, having a terminal, and detecting a pressure of the fluid passing through the flow path; a plate-shaped bracket for pressing the pressure sensor to the body; and a bus bar electrically connected to the terminal, the bus bar having a deformation portion extending in a direction intersecting with a thickness direction of the bracket in the hollow portion, the deformation portion being in contact with the terminal and formed by bending or meandering deformation of a center line of the bus bar, the deformation portion being supported by the housing in a cantilever manner.

According to an embodiment of the sensor unit of the present invention, wherein the deformation is a wave.

According to an embodiment of the sensor unit of the present invention, the deformation portion has a folded-back portion folded back between a fixed end and a free end, the free end being closer to the fixed end than the folded-back portion.

According to an embodiment of the sensor unit of the invention, comprising a plurality of said busbars,

the plurality of bus bars include bus bars having different shapes of the deformed portion when viewed from the thickness direction of the bracket.

According to an embodiment of the sensor unit of the present invention, the deformation portion has a widened portion with an enlarged width at a portion where the terminal meets.

According to an embodiment of the sensor unit of the invention, the widened portion is provided at a free end of the deformation portion.

According to an embodiment of the sensor unit of the present invention, wherein the deformation has the following functions: when the pressure sensor receives an external force from the fluid, the stress generated by the bus bar is relaxed.

According to an embodiment of the sensor unit of the present invention, wherein the bus bar comprises: a current supply bus disposed on the opposite side of the pressure sensor from the main body, electrically connected to the pressure sensor, and configured to supply current to the pressure sensor;

a grounding bus disposed on the opposite side of the pressure sensor from the main body, electrically connected to the pressure sensor, and used for grounding the pressure sensor; and

and an output bus disposed on a side opposite to the main body with respect to the pressure sensor, electrically connected to the pressure sensor, and used for outputting the pressure sensor.

According to an embodiment of the sensor unit of the present invention, the total length of the deformed portion of each of the current supply bus bar and the output bus bar is longer than the total length of the deformed portion of the grounding bus bar.

[ effects of the utility model ]

According to an embodiment of the sensor unit of the invention, an excessive force acting on the bus bar can be prevented.

Drawings

Fig. 1 is a perspective view showing a state of use of a sensor unit (first embodiment) according to the present invention.

Fig. 2 is an exploded perspective view of the sensor unit shown in fig. 1.

Fig. 3 is an exploded perspective view of the sensor unit shown in fig. 1 (an exploded perspective view showing a positional relationship between the pressure sensor and the bus bar).

Fig. 4 is a sectional view taken along line a-a of fig. 1.

Fig. 5 is a cross-sectional view taken along line B-B of fig. 1.

Fig. 6 is a view seen from the direction of arrow C in fig. 2.

Fig. 7 is a perspective view showing a use state of a sensor unit (second embodiment) according to the present invention.

Fig. 8 is an exploded perspective view of the sensor unit shown in fig. 7.

[ description of symbols ]

100: pressure control device

1: sensor unit

2: pressure sensor

21: terminal with a terminal body

22: flange part

23: sensor body

24: pressure detecting element

3: bracket

31: sensor hole

32: hole for bolt

33: locating hole

4: positioning part

5: shell body

50: fixing part

501: claw

502: step difference part

503: ribs

504: inner peripheral part (inner wall part)

51: hollow part

52: connector part

521: concave part

53: arm part

54: locating pin

6: bus bar

6A: bus for current supply

6B: grounding bus

6C: output bus

61: deformation part

61 α: deformation part

61 beta: deformation part

611: fixed end

612: free end

613: folded-back part

614: in part

615: peak value

62: widening part

64: one end part

65: the other end part

66: through hole

67: projection part

8: cap cap

81: plate part

82: projection part

821: through hole

83: side wall part

20: body

201: flow path

202: side hole

203: gasket ring

204: internal thread

205: positioning part

30: bolt

301: external thread

O6: center line

Q: fluid, especially for a motor vehicle

Detailed Description

Hereinafter, the sensor unit according to the present invention will be described in detail based on preferred embodiments shown in the drawings.

< first embodiment >

A first embodiment of a sensor unit according to the present invention will be described below with reference to fig. 1 to 6. For convenience of explanation, the X axis, the Y axis, and the Z axis are set for three axes orthogonal to each other. For example, an XY plane including an X axis and a Y axis is horizontal, and a Z axis is vertical. In the present specification, the vertical direction, the horizontal direction, the upper side, and the lower side are names for simply explaining the relative positional relationship of the respective parts, and the actual positional relationship may be other than the positional relationship shown by these names.

As shown in fig. 1, the pressure control device 100 includes a body 20, and a sensor unit 1 provided in the body 20. The pressure control device 100 is mounted on a vehicle such as an automobile, for example, and is used as a hydraulic control device for performing hydraulic control.

As shown in fig. 4, the body 20 has a flow path 201 through which the fluid Q can pass. The main body 20 is formed of an assembly of a plurality of plate-like members stacked on each other, for example. The fluid Q is not particularly limited, and may be transmission oil (transmission oil) when the pressure control device 100 is used as an automotive hydraulic control device, for example.

The sensor unit 1 is used by being installed on the upper portion of the main body 20. The sensor unit 1 includes a pressure sensor 2, a bus bar 6, a case 5, a cap 8, a bracket 3, and a positioning portion 4. The structure of each portion will be described below.

The pressure sensor 2 detects the pressure of the fluid Q passing through the flow path 201. The pressure sensor 2 includes: a sensor body 23 having a circuit board (not shown) built therein; three terminals 21 protruding from an upper portion of the sensor body 23; and a pressure detection element 24 provided at a lower portion of the sensor body 23.

The sensor body 23 is a portion having an outer shape of a cylinder or a disk. An annular flange 22 is provided along the circumferential direction on the outer peripheral portion of the sensor body 23. In the present embodiment, the flange 22 projects in a direction perpendicular to the axis of the terminal 21, that is, in a direction parallel to the XY plane.

Each terminal 21 protrudes in the Z-axis direction, and is electrically connected to the circuit board inside the sensor body 23.

The pressure detection element 24 has, for example, a strain gauge, and is configured such that the resistance value of the strain gauge changes in accordance with the force acting from the fluid Q. Also, the circuit substrate may convert the resistance value in the pressure detecting element 24 into a pressure value of the fluid Q. As shown in fig. 4, in the present embodiment, a side hole 202 is provided along the Z-axis direction in the main body 20, and the side hole 202 is connected to a channel 201 parallel to the XY plane. The fluid Q passing through the flow path 201 can enter the side hole 202 to press the pressure detection element 24. At this time, the pressure detection element 24 receives a force from the fluid Q, and detects the pressure value of the fluid Q as described above.

Further, an annular gasket 203 is disposed between the pressure sensor 2 and the main body 20 concentrically with the side hole 202. This prevents the fluid Q from leaking out between the pressure sensor 2 and the main body 20. The gasket 203 preferably has elasticity and is in a compressed state between the pressure sensor 2 and the body 20. This improves the liquid-tightness between the pressure sensor 2 and the main body 20, and contributes to preventing the leakage of the fluid Q.

The bus bar 6 is disposed on the opposite side of the pressure sensor 2 from the main body 20, i.e., on the upper side of the pressure sensor 2. The bus bar 6 is linear and made of a conductive metal material. The bus bar 6 is electrically connected to each terminal 21 of the pressure sensor 2, and includes a current supply bus bar 6A, a ground bus bar 6B, and an output bus bar 6C, as shown in fig. 2. The current supply bus 6A supplies current to the pressure sensor 2. The grounding bus 6B is used for grounding the pressure sensor 2. The output bus 6C is used for the output of the pressure sensor 2. The current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C are arranged in parallel to the XY plane with a space therebetween.

Further, an external connector (not shown) is electrically connected to the bus bar 6. In a state where the bus bar 6 and the external connector are electrically connected, an external current is supplied to the pressure sensor 2 via the current supply bus bar 6A. The pressure sensor 2 is grounded to the outside via a grounding bus 6B. Further, the output of the pressure sensor 2 is transmitted to the outside via the output bus 6C.

The bus bar 6 is bent or curved at a halfway point in the longitudinal direction (longitudinal direction), and the other end 65 of the one end 64 and the other end 65 is along the X-axis direction. In this way, the bus bar 6 has a shape in which one end side in the longitudinal direction thereof is bent or curved in the lateral direction of the bracket 3 and the other end side is the longitudinal direction of the bracket 3. Thereby, the sensor unit 1 can be miniaturized at least in the surface direction.

The bus bar 6 is supported and fixed inside the housing 5. This prevents unintended deformation of the bus bar 6, and more accurately electrically connects the bus bar 6 to each terminal 21 of the pressure sensor 2.

As shown in fig. 1 and 2, the case 5 is disposed at a middle position in the longitudinal direction of the elongated bracket 3. As will be described later, the bracket 3 is a member that presses the pressure sensor 2 against the main body 20. Further, the housing 5 has a fixing portion 50 fixed to the bracket 3. This prevents the housing 5 from being detached from the bracket 3, and thus maintains the positional relationship between the bus bar 6 and the pressure sensor 2, that is, maintains the electrical connection between the bus bar 6 and the pressure sensor 2.

The fixing portion 50 has a hollow portion 51 that penetrates the fixing portion 50 in the Z-axis direction. One end 64 in the longitudinal direction of the bus bar 6 is exposed in the hollow portion 51. Below the hollow portion 51, a part of the pressure sensor 2, that is, each terminal 21 is exposed. This protects the terminals 21 of the pressure sensor 2 and the bus bar 6 electrically connected to the terminals 21, thereby enabling more reliable electrical connection between the bus bar 6 and the pressure sensor 2.

In addition, the housing 5 has a connector portion 52 continuously extending from the fixing portion 50. The connector portion 52 includes a recess 521 into which the external connector is inserted from the X-axis direction negative side. In the recess 521, the other end 65 in the longitudinal direction of the bus bar 6 is exposed. Thus, the electrical connection with the external connector can be achieved with a simple structure.

The case 5 is preferably made of resin. This can reduce the weight of the entire sensor unit 1. The resin material constituting the case 5 is not particularly limited, and for example, polyester such as polybutylene terephthalate can be used.

As shown in fig. 1 and 2, the cap 8 is attached to the fixing portion 50 of the housing 5. The cap 8 has a disc shape. As shown in fig. 5, the central portion of the cap 8 is raised toward the Z-axis direction side than the peripheral portion.

As shown in fig. 5, in order to attach the cap 8 to the fixing portion 50 of the case 5, the cap 8 is placed on a step portion 502 provided on an upper portion of an inner peripheral portion (inner wall portion) 504 of the fixing portion 50. Further, a rib 503 is provided on the inner peripheral portion of the fixing portion 50 so as to protrude above the stepped portion 502. The rib 503 is annular along the circumferential direction of the inner peripheral portion 504 of the fixing portion 50. In a state where the cap 8 is placed on the stepped portion 502, the rib 503 is inclined toward the center of the fixing portion 50 to be plastically deformed, for example, whereby the cap 8 is fixed by caulking. Thereby, the cap 8 is mounted on the fixing portion 50 of the case 5 (hereinafter referred to as "mounted state").

In addition, the cap 8 in the mounted state can cover the hollow portion 51 of the fixing portion 50 from the upper side. This prevents short-circuiting between the terminals 21 and erroneous operation of the pressure sensor 2, which are caused by foreign matter such as dust or dirt entering the hollow portion 51.

Further, the cap 8 is separated from the one end 64 of the bus bar 6 in the hollow portion 51, that is, is in a non-contact state. Thus, for example, even if the pressure sensor 2 moves slightly in the Z-axis direction due to the pressure variation of the fluid Q passing through the flow path 201, the one end portion 64 of the bus bar 6 deforms following the movement. At this time, the cap 8 is away from the one end portion 64, and thus deformation of the one end portion 64 is allowable. This can maintain the electrical connection state between the bus bar 6 and each terminal 21 appropriately.

The cap 8 is also preferably made of resin, as in the case 5. This makes it possible to reduce the weight of the entire sensor unit 1 together with the housing 5. The resin material constituting the cap 8 is not particularly limited, and for example, the same resin material as the case 5 can be used.

As shown in fig. 1 and 2, a bracket 3 is disposed above the pressure sensor 2. The carriage 3 is formed of an elongated plate member along the X-axis direction. The bracket 3 can press the pressure sensor 2 downward, that is, against the main body 20 in a posture in which the thickness direction is parallel to the Z-axis direction.

The bracket 3 has a sensor hole 31 (see fig. 5) and two bolt holes 32.

The sensor hole 31 is a circular hole that penetrates in the Z-axis direction and into which the pressure sensor 2 is inserted from below and attached. The flange 22 of the pressure sensor 2 abuts against the edge of the sensor hole 31. As shown in fig. 4, when the bracket 3 is fixed to the main body 20 via the bolt 30, the pressure sensor 2 can be pressed against the main body 20. Thereby, the pressure detecting element 24 of the pressure sensor 2 can receive a force from the fluid Q.

As shown in fig. 5, the one end 64 of the bus bar 6 faces the sensor hole 31. Thus, when the bus bar 6 is electrically connected to each terminal 21 of the pressure sensor 2, the bus bar 6 and each terminal 21 can be seen together from above through the hollow portion 51, and therefore, the electrical connection operation can be performed more easily.

The two bolt holes 32 are disposed on both sides in the X-axis direction with the sensor hole 31 interposed therebetween. Each bolt hole 32 is a circular hole that penetrates in the Z-axis direction and into which the bolt 30 is inserted from above. As shown in fig. 4, the male screw 301 of the bolt 30 inserted into each bolt hole 32 is fastened to the female screw 204 provided in the main body 20. Thereby, the bracket 3 can be fixed to the body 20. In the present embodiment, the number of bolt holes 32 to be arranged is two, but the present invention is not limited to this, and may be three or more, for example. The bolt 30 preferably has a thread pitch of M5 or more and M10 or less, and more preferably M6 or more and M8 or less.

The material of the bracket 3 is not particularly limited, and for example, a metal material such as stainless steel, a resin material similar to the case 5, or the like can be used.

In the sensor unit 1, the bracket 3, the bus bar 6, and the case 5 are preferably integrally molded by insert molding. This allows the sensor unit 1 to be easily manufactured.

The positioning portion 4 is a portion that positions the carriage 3 with respect to the main body 20 in the XY plane direction, around the X axis, around the Y axis, and around the pressure sensor 2 (around the Z axis).

For example, when the positioning portion 4 is omitted, the position or posture of the bracket 3 with respect to the main body 20 may change due to the skill of an assembling worker or the like who assembles the sensor unit 1. If the position or posture of the bracket 3 with respect to the main body 20 is changed by the assembly operator, the bracket 3 may not be accurately positioned, and the pressure sensor 2 may not be uniformly pressed against the main body 20 by the bracket 3. There is a fear that the measured pressure becomes inaccurate for the pressure sensor 2 which is not uniformly pressed.

In contrast, in the sensor unit 1, the positioning portion 4 accurately positions the bracket 3 with respect to the main body 20, so that the edge of the sensor hole 31 can be brought into contact with the flange 22 of the pressure sensor 2 without positional deviation, and therefore the pressure sensor 2 can be uniformly pressed against the main body 20. This allows accurate measurement by the pressure sensor 2.

As shown in fig. 1 and 2, in the present embodiment, the positioning portion 4 includes two positioning holes 33 that penetrate in the Z-axis direction of the carriage 3, and positioning pins 54 that are press-fitted into the respective positioning holes 33. This allows the positioning unit 4 to have a simple structure.

The two positioning holes 33 are disposed on both sides in the X-axis direction with the sensor hole 31 interposed therebetween. That is, the sensor hole 31 is disposed between the two positioning holes 33. This makes it possible to separate the two positioning holes 33 as far as possible, thereby improving the positioning accuracy of the carriage 3 with respect to the main body 20.

The positioning portion 4 has two positioning holes 33, but the number of positioning holes 33 is not limited to two, and may be one, three or more, for example.

The diameter of each positioning hole 33 is preferably 3mm or more and 8mm or less, and more preferably 5mm or more and 6mm or less, for example.

The housing 5 has two arm portions 53 protruding from the fixed portion 50 toward both sides in the X-axis direction, and a positioning pin 54 is supported at an end portion of each arm portion 53 opposite to the fixed portion 50.

The positioning pins 54 are pressed into the respective positioning holes 33. Thereby, each positioning pin 41 is in a state of protruding downward. As shown in fig. 1, the positioning pins 54 are inserted into positioning holes 205 provided in the main body 20 and fitted. This allows the carriage 3 to be accurately positioned with respect to the main body 20 in the XY plane direction, around the X axis, around the Y axis, and around the pressure sensor 2. The fitting of the positioning pin 54 to the positioning hole 205 is preferably "clearance fitting".

As shown in fig. 5 and 6, a deformation portion 61 is provided at each end portion 64 of the bus bar 6 located in the hollow portion 51 of the housing 5. Each of the deformation portions 61 extends in a direction intersecting the thickness direction (Z-axis direction) of the bracket 3, that is, in a direction parallel to the XY plane, and the center line O6 of the bus bar 6 is bent or meandered. In addition, the deformed portions 61 may contact the terminals 21 in the hollow portion 51.

Since the deformation portions 61 are provided in the current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C, and the support state in the hollow portion 51 is the same, the support state of one deformation portion 61 will be described representatively.

As shown in fig. 6, the deformable portion 61 is cantilevered inside the housing 5 (the fixing portion 50). The term "cantilever support inside the housing 5 (fixing portion 50)" as used herein means a state in which: the deformable portion 61 is fixed to one position of the inner peripheral portion 504 of the fixing portion 50 in contact with the hollow portion 51, and has a fixed end 611 on the inner peripheral portion 504 side and a free end 612 on the opposite side of the fixed end 611. In the present specification, the deformed portion 61 and the one end portion 64 represent the same portion, and the deformed portion 61 may be referred to as the one end portion 64.

When the pressure sensor 2 receives an external force from the fluid Q, depending on the magnitude of the external force, it may vibrate (move) in the Z-axis direction and press the one end portion 64 excessively in the Z-axis direction. If the one end portion 64 is excessively pressed in the Z-axis direction, it tends to flex (deform) to relieve stress (internal stress), but if the deformed portion 61 is omitted, i.e., if it is linear and supported at both ends, it cannot flex sufficiently, and as a result, stress is not relieved. Further, when such a phenomenon is repeated, metal fatigue may be accumulated on the one end portion 64, and finally, breakage or fracture may occur. When the one end portion 64 is broken or broken, it is difficult to perform signal transmission and reception via the bus bar 6.

In contrast, in the sensor unit 1, the current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C are provided with the deformation portions 61, respectively, and the deformation portions 61 are supported by cantilevers. Accordingly, when the pressing force from the pressure sensor 2 acts on any of the current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C, the deformation portion 61 can be easily deformed in accordance with the deformation shape in which the center line O6 is bent or meandered. Further, the deformable portion 61 is cantilever-supported, and the degree of freedom, that is, the movable region in the Z-axis direction (vertical direction) is increased as compared with the case where it is supported at both ends.

Further, the deformed portion 61 can be sufficiently deflected in the Z-axis direction by the synergistic effect of the deformed shape and the cantilever support. Thus, the deformation portion 61 can function to relax the stress generated at the one end portion 64 (bus bar 6) when the pressure sensor 2 receives the external force from the fluid Q. Further, the stress relaxing function of the deforming portion 61 prevents an excessive force from being applied to the one end portion 64. This prevents the bus bars 6 from being damaged or broken due to accumulation of metal fatigue.

As shown in fig. 6, the three bus bars 6 include bus bars 6 having different shapes (deformed shapes) of the deformed portions 61 when viewed in the thickness direction of the bracket 3, that is, in the Z-axis direction. In the present embodiment, the deformed portion 61 of the current supply bus bar 6A and the deformed portion 61 of the output bus bar 6C in the current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C are symmetrical and identical in shape to each other (hereinafter, the deformed portion 61 is referred to as "deformed portion 61 α"). The deformed portion 61 of the grounding busbar 6B (hereinafter, the deformed portion 61 is referred to as "deformed portion 61 β") has a different shape from the deformed portion 61 α.

Each of the deformable portions 61 α has a folded portion 613 folded once between the fixed end 611 and the free end 612 when viewed from the Z-axis direction (when viewed from above). Thus, the free end 612 is closer to the fixed end 611 than the folded portion 613, and the entire length of the deformation portion 61 α can be secured as long as possible. The movable region (displacement amount) of the deformation portion 61 α in the Z-axis direction increases in proportion to the entire length of the deformation portion 61 α, and therefore the entire length of the deformation portion 61 α is preferably long.

The portion 614 between the fixed end 611 and the folded portion 613 is curved in an arc shape (arch shape) along the circumferential direction of the inner peripheral portion 504 of the fixed portion 50. The arc shape contributes to extending the entire length of the deformation portion 61 α.

The deformed portion 61 β has a waveform when viewed from the Z-axis direction, and has a plurality of peaks 615 corresponding to "hills" or "valleys" of the waveform. Thus, the deformation portion 61 β can secure the entire length as long as possible in accordance with the waveform. Similarly to the deformed portion 61 α, the movable region of the deformed portion 61 β in the Z-axis direction increases in proportion to the entire length of the deformed portion 61 β, and therefore the entire length of the deformed portion 61 β is preferably long. The deformation portion 61 β can be elongated in the longitudinal direction in accordance with the waveform, and the movable region in the Z-axis direction can be increased. The number of peaks 615 is not particularly limited as long as two or more peaks are formed. The deformed portion 61 has a waveform when viewed from the Z-axis direction, but is not limited thereto, and may have a waveform when viewed from one direction of the XY-plane direction (when viewed from the side), for example.

As described above, in the sensor unit 1, the deformation portion 61 can be sufficiently deflected in the Z-axis direction regardless of the shape of the deformation portion 61. This allows stress generated in each bus bar 6 to be relaxed when the pressure sensor 2 receives an external force from the fluid Q.

The overall length of the deformed portion 61 α and the overall length of the deformed portion 61 β may be the same, but the overall length of the deformed portion 61 α is preferably longer than the overall length of the deformed portion 61 β. Thus, when viewed from the Z-axis direction, the terminals 21 of the pressure sensor 2 can be arranged with the grounding bus bar 6B as the center, and the current supply bus bar 6A and the output bus bar 6C can be arranged on both sides of the grounding bus bar 6B.

The lengths of the three bus bars 6, that is, the total lengths of the current supply bus bar 6A, the grounding bus bar 6B, and the output bus bar 6C may be different lengths.

As shown in fig. 3, a protrusion 67 protruding in the width direction of the bus bar 6 is provided at a middle of each bus bar 6 in the longitudinal direction. The protruding portion 67 is engaged (hooked) into the fixing portion 50, and exerts an anchoring effect of restricting the position of the deformation portion 61. This maintains the positional relationship between each bus bar 6 and the pressure sensor 2, and hence the connection state between each bus bar 6 and the pressure sensor 2 is stable.

Further, the bus bar 6 has a through hole 66 (see fig. 3) formed in a portion thereof located in the hollow portion 51 of the housing 5. The through hole 66 is used when the bracket 3, the bus bar 6, and the case 5 are integrally molded by insert molding, and contributes to stress relaxation as in the case of the deformation portion 61. In some of the drawings, the through-hole 66 is omitted for description.

As shown in fig. 3, the deformation portion 61 has a widened portion 62 having a wider width than the diameter of the terminal 21 at a portion where the terminal 21 contacts. Thus, even when the pressure sensor 2 receives an external force from the fluid Q and the deformation portion 61 is deflected, the electrical connection between the pressure sensor 2 and the bus bar 6 can be stably maintained.

As shown in fig. 6, the widened portion 62 is provided at the free end 612 of the deformation portion 61. The free end 612 has the largest movable area in the deformation portion 61. Therefore, the widened portion 62 that is in contact with the terminal 21 and directly receives the force from the pressure sensor 2 is preferably provided at the free end 612 having the largest movable region. Thus, when the pressure sensor 2 vibrates in the Z-axis direction as described above, the widened portion 62 can sufficiently follow the vibration of the pressure sensor 2, and the electrical connection between the widened portion 62 (bus bar 6) and the pressure sensor 2 can be maintained more stably.

< second embodiment >

Hereinafter, a second embodiment of the sensor unit according to the present invention will be described with reference to fig. 7 and 8, and differences from the above-described embodiment will be mainly described, and descriptions of the same items will be omitted.

This embodiment is the same as the first embodiment except for the difference in cap structure.

As shown in fig. 7 and 8, in the present embodiment, a cap 8 is detachably attached to a fixing portion 50 of the housing 5. The cap 8 has: a plate portion 81; a protruding portion 82 protruding from the plate portion 81 toward the thickness direction lower side, i.e., the Z-axis direction negative side; and a side wall portion 83 protruding in the thickness direction along an edge portion of the plate portion 81.

The projection 82 is constituted by an elastic piece that is elastically deformable. In the attached state, the protruding portion 82 contacts the outer wall portion of the fixing portion 50, thereby fixing the cap 8 to the fixing portion 50. This can more reliably prevent the cap 8 from coming off the fixing portion 50, and thus can prevent the interior of the hollow portion 51 from being unintentionally exposed, thereby reliably protecting the interior of the hollow portion 51.

In addition, the protrusion 82 formed of an elastic sheet is provided with a through hole 821 penetrating in the thickness direction. The through hole 821 is hooked to a claw 501 provided to protrude from an outer wall of the fixing portion 50. The hooking of the through hole 821 and the claw 501 and the contact of the protrusion 82 and the fixing portion 50 cooperate to further reliably prevent the cap 8 from coming off the fixing portion 50. The protrusion amount of the claw 501 is preferably gradually increased downward, and the shape thereof is preferably wedge-shaped when viewed from the X-axis direction.

The side wall portion 83 is in contact with an outer wall portion (outer circumferential side) of the fixing portion 50 in the attached state. Accordingly, the fixing force of the cap 8 to the fixing portion 50 becomes larger in accordance with the side wall portion 83, and therefore, the cap 8 can be more reliably prevented from coming off from the fixing portion 50.

Further, the side wall portion 83 increases the area of the cap 8 covering the fixing portion 50, and thus foreign matter can be more reliably prevented from entering the hollow portion 51.

In the present embodiment, the downward projection amount of the side wall portion 83 is smaller than the downward projection amount of the projection portion 82, but the present invention is not limited to this, and may be the same as the downward projection amount of the projection portion 82, or may be larger than the downward projection amount of the projection portion 82, for example.

The sensor unit of the present invention has been described above with reference to the illustrated embodiments, but the present invention is not limited thereto, and each part constituting the sensor unit may be replaced with any structure that can exhibit the same function. In addition, any structure may be added.

In addition, the sensor unit of the present invention may be combined with any two or more of the structures (features) described in the above embodiments.

The number of bus bars 6 included in the sensor unit 1 is three in the above embodiments, but the present invention is not limited thereto, and may be two, four or more, for example.

The terminal 21 of the pressure sensor 2 and the bus bar 6 may be joined by laser welding or the like, for example.

Claims (9)

1. A sensor unit that is used by being provided to a body having a flow path through which a fluid can pass, the sensor unit comprising:

a housing having a hollow portion;

a pressure sensor housed in the hollow portion, having a terminal, and detecting a pressure of the fluid passing through the flow path;

a plate-shaped bracket for pressing the pressure sensor to the body; and

a bus bar electrically connected to the terminal and

the bus bar has a deformation portion which extends in the hollow portion in a direction intersecting the thickness direction of the bracket, is in contact with the terminal, and is formed by bending or meandering deformation of a center line of the bus bar,

the deformation portion is cantilevered to the housing.

2. The sensor unit according to claim 1, wherein the deformation portion is wave-shaped.

3. The sensor unit according to claim 1, wherein the deformation portion has a folded-back portion folded back between a fixed end and a free end, the free end being closer to the fixed end than the folded-back portion.

4. The sensor unit according to any one of claims 1 to 3, comprising a plurality of said bus bars,

the plurality of bus bars include bus bars having different shapes of the deformed portion when viewed from the thickness direction of the bracket.

5. The sensor unit according to any one of claims 1 to 3, wherein the deformation portion has a widened portion with an enlarged width at a portion where the terminal is connected.

6. The sensor unit in accordance with claim 5, wherein said widened portion is provided at a free end of said deformation portion.

7. Sensor unit according to any one of claims 1 to 3, characterised in that the deformation has the following function: when the pressure sensor receives an external force from the fluid, the stress generated by the bus bar is relaxed.

8. The sensor unit according to any one of claims 1 to 3, wherein the bus bar comprises: a current supply bus disposed on the opposite side of the pressure sensor from the main body, electrically connected to the pressure sensor, and configured to supply current to the pressure sensor;

a grounding bus disposed on the opposite side of the pressure sensor from the main body, electrically connected to the pressure sensor, and used for grounding the pressure sensor; and

and an output bus disposed on a side opposite to the main body with respect to the pressure sensor, electrically connected to the pressure sensor, and used for outputting the pressure sensor.

9. The sensor unit according to claim 8, wherein the total length of the deformed portions of the current supply bus bar and the output bus bar is longer than the total length of the deformed portions of the grounding bus bar, respectively.

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