CN213422508U - Sensor unit - Google Patents

Abstract

The utility model provides a sensor unit can be connected the generating line with the short distance each other electricity. The sensor unit includes a first pressure sensor, a second pressure sensor, a third pressure sensor, a bracket, a first current supply bus, a first grounding bus, a second current supply bus, a second grounding bus, a third current supply bus, a third grounding bus, and a bridge portion that electrically connects the buses of at least one of the groups of the first current supply bus and the second current supply bus, the group of the first current supply bus and the third current supply bus, the group of the first grounding bus and the second grounding bus, and the group of the first grounding bus and the third grounding bus to each other and is disposed at a position farther from the bracket than the buses. The utility model provides a sensor unit can be connected the generating line with the short distance each other electricity.

Description

Sensor unit

Technical Field

The utility model relates to a sensor unit.

Background

A hydraulic control device mounted in 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 connected to each of the pressure sensors. Patent document 1 discloses a configuration in which a plurality of pressure sensors are arranged in a line, that is, arranged in one direction.

[ 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, the hydraulic control device described in patent document 1 has a problem that the distance for electrically connecting the bus bars to each other may be long depending on the arrangement of the pressure sensors other than those disclosed. When the distance for electrically connecting the bus bars is long, for example, the resistance increases, which is a problem in the electric circuit of the hydraulic control device.

An object of the utility model is to provide a sensor unit can be connected the generating line with the short distance each other electricity.

[ means for solving problems ]

The utility model discloses a sensor unit's a form is set up in the body and is used, the body has the flow path that fluid can flow through, sensor unit includes: a first pressure sensor that detects a pressure of the fluid flowing through the flow path; a second pressure sensor that detects a pressure of the fluid flowing through the flow path; a third pressure sensor that detects a pressure of the fluid flowing through the flow path; a plate-shaped bracket that presses the first pressure sensor, the second pressure sensor, and the third pressure sensor against the main body; a first current supply bus disposed on the opposite side of the body with respect to the first pressure sensor, electrically connected to the first pressure sensor, and configured to supply current to the first pressure sensor; a first grounding bus disposed on a side opposite to the main body with respect to the first pressure sensor, electrically connected to the first pressure sensor, and used for grounding the first pressure sensor; a second current supply bus disposed on the opposite side of the main body with respect to the second pressure sensor, electrically connected to the second pressure sensor, and configured to supply current to the second pressure sensor; a second grounding bus disposed on the opposite side of the main body with respect to the second pressure sensor, electrically connected to the second pressure sensor, and used for grounding the second pressure sensor; a third current supply bus disposed on the opposite side of the body with respect to the third pressure sensor, electrically connected to the third pressure sensor, and configured to supply current to the third pressure sensor; and a third grounding bus disposed on the opposite side of the main body with respect to the third pressure sensor and electrically connected to the third pressure sensor, a ground for the third pressure sensor, wherein the current supply to the first pressure sensor is fastest among the first pressure sensor, the second pressure sensor, and the third pressure sensor, when one direction parallel to the bracket is a first axis direction and a direction parallel to the bracket and intersecting the first axis direction is a second axis direction, as viewed from the first axis direction, the second pressure sensor is disposed on one side of the first pressure sensor in the second axial direction, the third pressure sensor is disposed on the other side in the second axial direction with respect to the first pressure sensor, and the sensor unit includes: and a bridging portion that electrically connects the bus bars of at least one of the group of the first current supply bus bar and the second current supply bus bar, the group of the first current supply bus bar and the third current supply bus bar, the group of the first grounding bus bar and the second grounding bus bar, and the group of the first grounding bus bar and the third grounding bus bar, and is disposed at a position that is farther from the bracket than the bus bars.

In a more preferred embodiment, the bridge portion is formed in an elongated shape and is made of a rigid member having conductivity.

In a further preferred embodiment, the bridge has a widened portion with an enlarged width.

In a more preferred embodiment, the bridge portion has a flat plate shape and is disposed parallel to the bracket.

In a more preferred embodiment, the bridge portion is disposed at a position not overlapping at least one of the first pressure sensor, the second pressure sensor, and the third pressure sensor in a plan view of the bracket.

In a more preferred embodiment, the at least one group of busbars has a deformation in which the centre line of the busbars is bent or meanderingly deformed.

In a more preferred embodiment, the deformation is wave-shaped.

In a more preferred embodiment, the pressure sensor includes a first output bus disposed on a side opposite to the main body with respect to the first pressure sensor, electrically connected to the first pressure sensor, and used for an output of the first pressure sensor; a second output bus disposed on the opposite side of the body with respect to the second pressure sensor, electrically connected to the second pressure sensor, and used for outputting the second pressure sensor; and a third output bus disposed on the opposite side of the body with respect to the third pressure sensor, electrically connected to the third pressure sensor, and used for an output of the third pressure sensor.

In a more preferred embodiment, a housing is included, having a hollow.

In a more preferred embodiment, the bridge is exposed from a surface of the housing.

[ effects of the utility model ]

According to one aspect of the sensor unit of the present invention, the bus bars can be electrically connected to each other at a short distance.

Drawings

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

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is an exploded perspective view of the sensor unit shown in fig. 1.

Fig. 4 is a perspective view showing an internal structure of the sensor unit shown in fig. 1.

Fig. 5 is a perspective view showing an internal structure of the sensor unit shown in fig. 1.

Fig. 6 is a perspective view showing an internal structure of the sensor unit shown in fig. 1.

Fig. 7 is an exploded perspective view showing an internal structure of the sensor unit shown in fig. 1.

Fig. 8 is a plan view showing an internal structure of the sensor unit shown in fig. 1.

Fig. 9 is a plan view showing an internal structure of the sensor unit shown in fig. 1.

Description of the symbols

100: pressure control device

1: sensor unit

2: pressure sensor

2A: first pressure sensor

2B: second pressure sensor

2C: third 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 screw

33: locating hole

4: positioning part

41: locating pin

5: shell body

50: fixing part

51: hollow part

52: connector part

521: concave part

53: upper surface (surface)

6: bus bar

6A 1: first current supply bus

6A 2: bus bar for supplying second current

6A 3: third current supply bus

6B 1: first grounding bus

6B 2: second grounding bus

6B 3: third grounding bus

6C 1: first output bus

6C 2: bus bar for second output

6C 3: third output bus

61: deformation part

62: widening part

66: through hole

67: the other end part

68: one end part

69: projection part

7: bridge connection part

7A: bridge connection part

7B: bridge connection part

71: widening part

8: cover

20: body

201: flow path

202: side hole

203: gasket ring

204: internal thread

205: locating hole

30: screw rod

301: external thread

40: external connector

O2A: center of a ship

O2B: center of a ship

O2C: center of a ship

O6: center line

Q: fluid, especially for a motor vehicle

Detailed Description

Hereinafter, an embodiment of the sensor unit according to the present invention will be described with reference to fig. 1 to 9. 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. 2, the body 20 has a flow path 201 through which the fluid Q can flow. 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 first pressure sensor 2A, a second pressure sensor 2B, a third pressure sensor 2C, a first current supply bus 6a1, a first grounding bus 6B1, a first output bus 6C1, a second current supply bus 6a2, a second grounding bus 6B2, a second output bus 6C2, a third current supply bus 6A3, a third grounding bus 6B3, a third output bus 6C3, a bracket 3, a positioning portion 4, a case 5, and a cover 8. The structure of each portion will be described below.

In the present embodiment, when one direction parallel to the plate-shaped bracket 3 is a first axial direction, and a direction parallel to the bracket 3 and intersecting the first axial direction is a second axial direction, the first axial direction is parallel to the X-axis direction, and the second axial direction is parallel to the Y-axis direction.

When the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C are not distinguished from each other, they may be simply referred to as "pressure sensors 2".

Note that, when the first current supply bus 6a1, the first grounding bus 6B1, the first output bus 6C1, the second current supply bus 6a2, the second grounding bus 6B2, the second output bus 6C2, the third current supply bus 6A3, the third grounding bus 6B3, and the third output bus 6C3 are not distinguished, they may be simply referred to as "bus 6".

The first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C each detect the pressure of the fluid Q flowing through the flow path 201. The sensor unit 1 of the present embodiment includes one first pressure sensor 2A, two second pressure sensors 2B, and two third pressure sensors 2C. The number of the second pressure sensors 2B and the third pressure sensors 2C is not limited to two, and may be one or three or more, for example. The number of the second pressure sensors 2B and the number of the third pressure sensors 2C may be the same or different.

As shown in fig. 9 (the same applies to fig. 7 and 8), the center O2B of each second pressure sensor 2B is disposed on the Y-axis direction positive side (one side in the second axis direction) with respect to the center O2A of the first pressure sensor 2A as viewed from the X-axis direction (the first axis direction). On the other hand, the center O2C of each third pressure sensor 2C is disposed on the Y-axis direction negative side (the second axial direction side) with respect to the center O2A of the first pressure sensor 2A.

The positional relationship between the first pressure sensor 2A and each of the second pressure sensors 2B in the X axis direction is not limited to the positional relationship shown in fig. 9. The positional relationship between the first pressure sensor 2A and each of the third pressure sensors 2C in the X axis direction is not limited to the positional relationship shown in fig. 9.

The positional relationship between the second pressure sensors 2B in the X-axis direction and the Y-axis direction is not limited to the positional relationship shown in fig. 9. The positional relationship between the third pressure sensors 2C in the X-axis direction and the Y-axis direction is not limited to the positional relationship shown in fig. 9.

The first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C have the same configuration except for different locations, and therefore the third pressure sensor 2C will be representatively described below.

As shown in fig. 2 and 7, the third pressure sensor 2C 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 orthogonal 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 main body 23. Each terminal 21 is electrically connected to the bus bar 6 on the side opposite to the sensor main body 23, that is, on the positive side in the Z-axis direction.

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. In addition, 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. 2, in the present embodiment, the main body 20 is provided with a side hole 202 along the Z-axis direction, and the side hole 202 is connected to a channel 201 parallel to the XY plane. The fluid Q flowing 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.

An annular gasket 203 is disposed between the third pressure sensor 2C 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.

A bracket 3 is disposed above the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C. The bracket 3 is formed of a plate member, and can press the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C downward, i.e., all together against the main body 20, in a posture in which the thickness direction is parallel to the Z-axis direction.

As shown in fig. 5, the bracket 3 has five sensor holes 31 and four screw holes 32.

Each of the sensor holes 31 is a circular hole that penetrates in the Z-axis direction and into which any one of the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C is inserted from below and attached. The flange 22 abuts against the edge of each sensor hole 31. As shown in fig. 2, when the bracket 3 is fixed to the main body 20 via the screw 30, the pressure sensor 2 (typically, the third pressure sensor 2C in fig. 2) can be pressed against the main body 20. Thereby, the pressure detecting element 24 of the third pressure sensor 2C can receive a force from the fluid Q.

As shown in fig. 5, a part (one end 68) of the bus bar 6 is exposed from the sensor hole 31. Accordingly, 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 thus the electrical connection operation can be performed more easily.

The screw holes 32 are arranged at intervals. Each screw hole 32 is a circular hole that penetrates in the Z-axis direction and into which the screw 30 is inserted from above. As shown in fig. 2, the male screw 301 of the screw 30 inserted into each screw 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 screw holes 32 to be arranged is four, but the present invention is not limited to this, and may be two, three, or five or more, for example. The screw 30 preferably has a thread pitch of M5 or more and M10 or less, 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 such as polyester, or the like can be used.

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

For example, in the case where the positioning portion 4 is omitted, there is a possibility that the position or posture of the bracket 3 with respect to the body 20 is changed by the skill of an assembling worker or the like who assembles the sensor unit 1. If the position or posture of the carriage 3 with respect to the main body 20 is changed by the assembly operator, the carriage 3 may not be accurately positioned, and the pressure sensor 2 may not be uniformly pressed against the main body 20 by the carriage 3. For a pressure sensor 2 that is not pressed evenly, the pressure that may be measured becomes inaccurate.

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 portion of the sensor hole 31 can be brought into contact with the flange portion 22 of the pressure sensor 2 without positional deviation, and the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C can be uniformly pressed against the main body 20. This allows accurate measurement to be performed by the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C.

As shown in fig. 4 and 5, in the present embodiment, the positioning portion 4 includes two positioning holes 33 penetrating in the Z-axis direction of the carriage 3, and positioning pins 41 press-fitted into the positioning holes 33. This allows the positioning unit 4 to have a simple structure.

The two positioning holes 33 are disposed as far apart as possible. This improves 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.

In the present embodiment, each positioning hole 33 is a through hole penetrating the bracket 3, but is not limited thereto, and may be a non-through hole extending halfway in the thickness direction of the bracket 3.

Positioning pins 41 are press-fitted into the positioning holes 33. Thereby, each positioning pin 41 is in a state of protruding downward. As shown in fig. 2, each positioning pin 41 is inserted into a positioning hole 205 provided in the main body 20 and fitted therein. This enables the carriage 3 to be accurately positioned with respect to the main body 20 in the XY plane direction, the directions around the X axis, the Y axis, and the Z axis. The fitting of the positioning pin 41 to the positioning hole 205 is preferably "clearance fitting".

In the present embodiment, the positioning portion 4 has the positioning hole 33 and the positioning pin 41, but is not limited to this, and the positioning pin 41 may be omitted. In the case where the positioning pin 41 is omitted, the main body 20 is provided with a positioning pin inserted into the positioning hole 33 and fitted thereto.

Furthermore, in the present embodiment, the positioning pin 41 is configured separately from the bracket 3 with respect to the positioning portion 4, but the present invention is not limited thereto, and the positioning pin 41 and the bracket 3 may be a single member.

As shown in fig. 1, 3, and 4, a housing 5 is disposed on the bracket 3. The housing 5 has a fixing portion 50 fixed to the bracket 3. Thereby, the housing 5 can be prevented from being detached from the bracket 3. Further, the positional relationship between the bus bar 6 supported by the housing 5 and the pressure sensor 2 pressed by the bracket 3, that is, the electrical connection between the bus bar 6 and the pressure sensor 2 can be maintained.

The fixing portion 50 has five hollow portions 51 that penetrate the fixing portion 50 in the Z-axis direction. In the hollow portion 51, a part (one end 68) of the bus bar 6 in the longitudinal direction is exposed. 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.

Further, the housing 5 has a connector portion 52 continuously extending from the fixing portion 50. As shown in fig. 8, the external connector 40 electrically connected to the bus bar 6 is connected to the connector portion 52 from the X-axis direction negative side. The connector portion 52 includes a recess 521 into which the external connector 40 is inserted. In the recess 521, a part (the other end 67) of the bus bar 6 in the longitudinal direction is exposed. Thus, the electrical connection with the external connector 40 can be made 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.

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

The cover 8 is detachably attached to the fixing portion 50 of the housing 5. The cover 8 has a plate shape, and can cover the hollow portions 51 of the fixing portion 50 from above in a state of being attached to the fixing portion 50 of the housing 5 (hereinafter referred to as an "attached state"). 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 portions 51.

In each hollow portion 51, the cover 8 is separated from the bus bar 6, i.e., is in a non-contact state. Thus, for example, even if the pressure sensor 2 moves slightly in the Z-axis direction due to pressure fluctuations of the fluid Q flowing through the flow path 201, the bus bar 6 can deform following the movement. At this time, the cover 8 is away from the bus bar 6, and thus deformation of the bus bar 6 can be tolerated. This can maintain the electrical connection state between the bus bar 6 and each terminal 21 appropriately.

The cover 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 cover 8 is not particularly limited, and for example, the same resin material as the case 5 can be used.

As shown in fig. 7 and 8, the first current supply bus bar 6a1, the first grounding bus bar 6B1, and the first output bus bar 6C1 are disposed on the opposite side of the main body 20, that is, on the positive side in the Z-axis direction, with respect to the first pressure sensor 2A. One end 68 of each of the first current supply bus bar 6a1, the first output bus bar 6C1, and the first grounding bus bar 6B1 is electrically connected to the upper side of each terminal 21 of the first pressure sensor 2A.

The first current supply bus 6a1 is used to supply current to the first pressure sensor 2A. The first output bus 6C1 is used for the output of the first pressure sensor 2A. The first grounding busbar 6B1 is used for grounding the first pressure sensor 2A.

Further, a second current supply bus bar 6a2, a second grounding bus bar 6B2, and a second output bus bar 6C2 are disposed on the positive side in the Z-axis direction with respect to each second pressure sensor 2B. One end 68 of each of the second current supply bus bar 6a2, the second grounding bus bar 6B2, and the second output bus bar 6C2 is electrically connected to the upper side of each terminal 21 of the second pressure sensor 2B.

The second current supply bus 6a2 is used to supply current to the second pressure sensor 2B. The second grounding busbar 6B2 is used for grounding the second pressure sensor 2B. The second output bus 6C2 is used for the output of the second pressure sensor 2B.

On the positive side in the Z-axis direction with respect to the third pressure sensor 2C, a third current supply bus bar 6a3, a third grounding bus bar 6B3, and a third output bus bar 6C3 are arranged. One end 68 of each of the third current-supply bus bar 6a3, the third grounding bus bar 6B3, and the third output bus bar 6C3 is electrically connected to the upper side of each terminal 21 of the third pressure sensor 2C.

The third current supply bus 6a3 is used to supply current to the third pressure sensor 2C. The third grounding busbar 6B3 is used for grounding the third pressure sensor 2C. The third output bus 6C3 is used for the output of the third pressure sensor 2C.

The bus bar 6 disposed according to each application as described above is linear and made of a conductive metal material. Each bus bar 6 is supported and fixed inside the case 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. 8, each bus bar 6 has a deformed portion 61 at one end 68. In fig. 8, a deformed portion 61 connected to the bus bar 6 of the second pressure sensor 2B is representatively denoted by a reference numeral. The deforming portion 61 extends in a direction intersecting the Z-axis direction of the carriage 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. The deformation portion 61 may be configured to contact the terminal 21 in the hollow portion 51.

The deformation portion 61 has a waveform when viewed from the Z-axis direction (when viewed from the top), 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.

When the second pressure sensor 2B receives an external force from the fluid Q, depending on the magnitude of the external force, the second pressure sensor may vibrate (move) in the Z-axis direction and may excessively press the one end portion 68 in the Z-axis direction. When the one end portion 68 is excessively pressed in the Z-axis direction, the stress (internal stress) is relieved by bending (deforming), but when the deformed portion 61 is omitted, that is, the end portion is linear, the stress cannot be sufficiently relieved, and as a result, the stress is not relieved. Further, when such a phenomenon is repeated, metal fatigue may be accumulated on the one end portion 68, and finally, breakage or fracture may occur. If the one end portion 68 is broken or fractured, it is difficult to perform signal transmission and reception via the bus bar 6.

In contrast, in the sensor unit 1, the bus bar 6 is provided with the deformation portion 61. The deformation portion 61 can be elongated in the longitudinal direction in accordance with the waveform, and therefore can be sufficiently bent in the Z-axis direction. Thus, the deformation portion 61 can function to relax the stress generated at the one end portion 68 when the second pressure sensor 2B receives the external force from the fluid Q. Further, excessive force is prevented from acting on the one end portion 68 by the stress relaxation function of the deformation portion 61, and thus breakage or fracture due to accumulation of metal fatigue can be prevented. This can maintain the state in which the bus bar 6 and the second pressure sensor 2B are electrically connected, and therefore the second pressure sensor 2B can stably operate.

The deformable portion 61 is supported at one end or both ends inside the housing 5 (the fixing portion 50). Thereby, the deformable portion 61 is stably disposed in the hollow portion 51, and the stress relaxation function can be sufficiently exhibited.

The bus bar 6 has a through hole 66 formed in a portion 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.

The deformation portion 61 has a widened portion 62 with a width widened to be larger 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.

The drawing of each bus bar 6, that is, the wiring path will be described below. First, the first current supply bus 6a1, the first output bus 6C1, the second ground bus 6B2, the second output bus 6C2, and the third output bus 6C3, which are directly electrically connected to the external connector 40 via the other end 67, will be described.

As shown in fig. 8, the first current-supply bus bar 6a1 is a single bus bar 6 from one end 68 to the other end 67. Further, the first current-supply bus bar 6a1 is bent or curved at a plurality of points in the longitudinal direction. The other end 67 of the first current-supply bus bar 6a1 protrudes toward the negative side in the X-axis direction in the connector unit 52.

The first output bus 6C1 is a single bus 6 from one end 68 to the other end 67, similarly to the first current supply bus 6a 1. Further, the first output bus bar 6C1 is bent or meandered at a plurality of points in the middle of the longitudinal direction. The other end 67 of the first output bus bar 6C1 projects toward the negative side in the X-axis direction in the connector unit 52.

The second grounding busbars 6B2 are connected to each other at intermediate positions, and the other ends 67 are shared as one member. Further, the second grounding straps 6B2 are bent or curved at a plurality of points in the middle of the longitudinal direction. The common other end portion 67 projects toward the X-axis direction negative side in the connector portion 52.

Each of the second output bus bars 6C2 is a single bus bar 6 from one end 68 to the other end 67. Further, the second output bus bars 6C2 are bent or curved at a plurality of points in the middle of the longitudinal direction. The other end 67 of each second output bus bar 6C2 projects toward the negative side in the X-axis direction in the connector unit 52.

Each of the third output bus bars 6C3 is a single bus bar 6 from one end 68 to the other end 67. Further, the third output bus bars 6C3 are bent or curved at a plurality of points in the middle of the longitudinal direction. The other end 67 of each third output bus bar 6C3 projects toward the negative side in the X-axis direction in the connector unit 52.

The other end portions 67 of the first current supply bus 6a1, the first output bus 6C1, the second grounding bus 6B2, the second output bus 6C2, and the third output bus 6C3 extend parallel to the X-axis direction, and are arranged on the connector portion 52 at intervals in the Y-axis direction.

In a state where the connector unit 52 and the external connector 40 are connected (hereinafter referred to as a "connected state"), the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C are supplied with the fastest current through the first current-supply bus 6a1 to the first pressure sensor 2A. In the connected state, the output of the first pressure sensor 2A is transmitted to the outside via the first output bus 6C 1.

In the connected state, each of the second pressure sensors 2B is grounded to the outside via the second grounding bus bar 6B2, and outputs are transmitted to the outside via the second output bus bar 6C 2.

In the connected state, each third pressure sensor 2C transmits an output to the outside via the third output bus 6C 3.

Next, the remaining bus bars 6 other than the first current supply bus bar 6a1, the first output bus bar 6C1, the second grounding bus bar 6B2, the second output bus bar 6C2, and the third output bus bar 6C3, that is, the first grounding bus bar 6B1, the second current supply bus bar 6a2, the third current supply bus bar 6A3, and the third grounding bus bar 6B3 will be described.

As shown in fig. 8, the first grounding busbar 6B1 is connected to each third grounding busbar 6B3 at a midpoint thereof, and is formed as one member.

The second current supply bus bars 6a2 are also connected to each other at intermediate positions, and are formed as one member.

Further, the third current-supply bus bars 6a3 are also connected to each other at intermediate positions, and are formed as one member.

In addition, the first grounding bus bar 6B1, the second current supply bus bar 6a2, the third current supply bus bar 6A3, and the third grounding bus bar 6B3 are not in the current state and are in the current state to be in the state of being electrically connected to the external connector 40. Therefore, the sensor unit 1 is configured to be able to be in a current-carrying state by the first grounding bus bar 6B1, the second current supply bus bar 6a2, the third current supply bus bar 6A3, and the third grounding bus bar 6B 3. The structure and operation will be described below.

As shown in fig. 4 to 7 and 9, the sensor unit 1 includes a bridge portion 7.

The bridge 7 electrically connects the bus bars 6 of at least one of the group of the first current supply bus bar 6a1 and the second current supply bus bar 6a2, the group of the first current supply bus bar 6a1 and the third current supply bus bar 6A3, the group of the first grounding bus bar 6B1 and the second grounding bus bar 6B2, and the group of the first grounding bus bar 6B1 and the third grounding bus bar 6B 3. The bridge portion 7 is formed of a hard member having conductivity. Thereby, the structure of the bridge portion 7 becomes simple.

In the present embodiment, two bridge portions 7 are arranged. In the bridge portion 7A of the two bridge portions 7, the bridge portion 7A electrically connects the first current supply bus bar 6a1 and the second current supply bus bars 6a2, and the first current supply bus bar 6a1 and the third current supply bus bars 6 A3. The other bridge 7B is responsible for electrically connecting the group of the first ground bus bar 6B1 and the second ground bus bar 6B 2. As described above, the first grounding busbar 6B1 and the third grounding busbar 6B3 are connected to each other in the middle of the group and form one member.

By the bridge portion 7A, in the connected state, a current can be supplied to the second pressure sensor 2B via the second current supply bus 6a2, and a current can be supplied to the third pressure sensor 2C via the third current supply bus 6 A3.

In the connected state, the bridging portion 7B can ground the first pressure sensor 2A to the outside via the first ground bus bar 6B 1. Further, since the first grounding bus bar 6B1 is connected to the third grounding bus bar 6B3, the third pressure sensor 2C can be grounded to the outside via the third grounding bus bar 6B 3.

As shown in fig. 4 to 7, each bridge portion 7 is disposed at a position farther from the bracket 3 than each bus bar 6, that is, at an upper side than the one end portion 68 of each bus bar 6. Thus, the bridge portions 7 extend over the upper side of the pressure sensor 2, for example, to prevent the bus bars 6 from being detoured as much as possible, and thus the bus bars 6 can be electrically connected to each other at a short distance.

The bridging portions 7 have an elongated flat plate shape, although having different overall lengths, and are disposed parallel to the bracket 3, that is, parallel to the XY plane. Thereby, each bridge 7 contributes to the connection of the bus bars 6 at a short distance to each other, and contributes to the miniaturization of the sensor unit 1 in the Z-axis direction.

As shown in fig. 4, each bridge portion 7 is exposed from an upper surface (front surface) 53 of the housing 5. As described above, in the sensor unit 1, the bracket 3, the bus bars 6, and the case 5 are integrally formed by insert molding. Thus, when the sensor unit 1 is assembled by connecting the bridge portions 7 to the bus bars 6, the bus bars 6 are already assembled into the case 5 and fixed. Further, the bridge portions 7 are easily connected to the bus bar 6 when the sensor unit 1 is assembled by a simple operation of overlapping the bridge portions 7 on the upper surface 53 of the case 5.

As shown in fig. 9, each of the bridge portions 7 is disposed at a position not overlapping at least one of the first pressure sensor 2A, the second pressure sensor 2B, and the third pressure sensor 2C when viewed from the Z-axis direction positive side (when viewed from the top of the bracket 3). In the configuration shown in fig. 9, the bridge portion 7A is disposed at a position not overlapping with the third pressure sensor 2C disposed on the X-axis direction positive side among the first pressure sensor 2A, the second pressure sensors 2B, and the two third pressure sensors 2C. The bridge portion 7B is disposed at a position not overlapping with the second pressure sensors 2B and the third pressure sensors 2C. By the positional relationship between the bridge portion 7 and the pressure sensor 2, for example, when the connection state between the pressure sensor 2 and the bus bar 6 is visually confirmed from above, the visual confirmation can be prevented from being obstructed by the bridge portion 7 (see fig. 4).

Each bridge 7 has a plurality of widened portions 71 with enlarged widths. The bridge portion 7A has widened portions 71 at both ends and midway in the longitudinal direction. The bridge portion 7B has widened portions 71 at both ends. Each widened portion 71 is a connection portion electrically connected to the bus bar 6. This can stably maintain the electrical connection between the bus bars 6.

As shown in fig. 7, the portion of the bus bar 6 electrically connected to the widened portion 71 branches off from the middle of the bus bar 6 and becomes a protruding portion 69 protruding upward.

The sensor unit according to 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 capable of performing the same function. Further, any structure may be added.

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 (10)

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

a first pressure sensor that detects a pressure of the fluid flowing through the flow path;

a second pressure sensor that detects a pressure of the fluid flowing through the flow path;

a third pressure sensor that detects a pressure of the fluid flowing through the flow path;

a plate-shaped bracket that presses the first pressure sensor, the second pressure sensor, and the third pressure sensor against the main body;

a first current supply bus disposed on the opposite side of the body with respect to the first pressure sensor, electrically connected to the first pressure sensor, and configured to supply current to the first pressure sensor;

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

a second current supply bus disposed on the opposite side of the main body with respect to the second pressure sensor, electrically connected to the second pressure sensor, and configured to supply current to the second pressure sensor;

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

a third current supply bus disposed on the opposite side of the body with respect to the third pressure sensor, electrically connected to the third pressure sensor, and configured to supply current to the third pressure sensor; and

a third grounding bus disposed on the opposite side of the body with respect to the third pressure sensor, electrically connected to the third pressure sensor, and used for grounding the third pressure sensor,

wherein the first pressure sensor, the second pressure sensor, and the third pressure sensor are configured to supply the current to the first pressure sensor fastest,

when one direction parallel to the bracket is a first axial direction and a direction parallel to the bracket and intersecting the first axial direction is a second axial direction, the second pressure sensor is arranged on one side of the first pressure sensor in the second axial direction and the third pressure sensor is arranged on the other side of the first pressure sensor in the second axial direction as viewed from the first axial direction,

the sensor unit includes: and a bridging portion that electrically connects the bus bars of at least one of the group of the first current supply bus bar and the second current supply bus bar, the group of the first current supply bus bar and the third current supply bus bar, the group of the first grounding bus bar and the second grounding bus bar, and the group of the first grounding bus bar and the third grounding bus bar, and is disposed at a position that is farther from the bracket than the bus bars.

2. Sensor unit according to claim 1,

the bridge portion is formed in an elongated shape and is made of a hard member having conductivity.

3. Sensor unit according to claim 1 or 2,

the bridge portion has a widened portion with an enlarged width.

4. Sensor unit according to claim 1 or 2,

the bridge portion is flat and arranged parallel to the bracket.

5. Sensor unit according to claim 1 or 2,

the bridge portion is disposed at a position not overlapping at least one of the first pressure sensor, the second pressure sensor, and the third pressure sensor in a plan view of the bracket.

6. Sensor unit according to claim 1 or 2,

the bus bar of the at least one group has a deformation portion in which a center line of the bus bar is bent or meanderingly deformed.

7. Sensor unit according to claim 6,

the deformation portion is in a wave shape.

8. Sensor unit according to claim 1 or 2, characterized in that it comprises:

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

a second output bus disposed on the opposite side of the body with respect to the second pressure sensor, electrically connected to the second pressure sensor, and used for outputting the second pressure sensor; and

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

9. Sensor unit according to claim 1 or 2, characterized in that it comprises:

a housing having a hollow portion.

10. Sensor unit according to claim 9,

the bridge portion is exposed from a surface of the housing.

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