CN213932943U - Sensor unit - Google Patents

Abstract

The utility model provides a sensor unit can press pressure sensor in the body uniformly. The sensor unit (1) is used by being provided to a main body (20), and the main body (20) has a flow path (201) through which a fluid (Q) can flow. The sensor unit (1) comprises: a pressure sensor (2) that detects the pressure of the fluid (Q) flowing through the flow path (201); a plate-shaped bracket (3) which presses the pressure sensor (2) against the body (20), and which has a sensor hole (31) and two screw holes (32), wherein the sensor hole (31) penetrates in the thickness direction and allows the pressure sensor (2) to be mounted thereon, and wherein the two screw holes (32) are disposed across the sensor hole (31), penetrate in the thickness direction, and allow the screw (30) to be inserted therein; and a positioning part (4) for positioning the bracket (3) relative to the body (20).

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; an oil pressure sensor that measures a pressure of oil flowing in the oil passage; and a fixing member that presses and fixes the oil pressure sensor to the oil passage body via the screw.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2018-16909

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

However, the hydraulic control device described in patent document 1 has the following problems: depending on the position or posture of the fixing member relative to the oil passage body, the pressure sensor may not be accurately positioned, and the pressure sensor may not be uniformly pressed against the body. In the case where the pressure sensor cannot be uniformly pressed against the body, the pressure measured by the pressure sensor may become inaccurate.

An object of the utility model is to provide a sensor unit can press pressure sensor in the body uniformly.

[ means for solving problems ]

An embodiment of the sensor unit of the present invention is provided in a body for use, the body having a flow path through which a fluid can flow, the sensor unit including: a pressure sensor that detects a pressure of the fluid flowing through the flow path; a plate-shaped bracket that presses the pressure sensor against the main body, the bracket having a sensor hole through which the pressure sensor is mounted, and two screw holes that are disposed across the sensor hole, penetrate in the thickness direction, and into which screws are inserted; and a positioning portion that positions the bracket with respect to the body.

[ effects of the utility model ]

According to an embodiment of the sensor unit of the present invention, the pressure sensor can be uniformly pressed against the body.

Drawings

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

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

Fig. 3 is a sectional view taken along line a-a of fig. 1.

Fig. 4 is a plan view of a bracket included in the sensor unit shown in fig. 1.

Description of the 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 screw

33: locating hole

35: hole for casing

4: positioning part

41: locating pin

5: shell body

50: fixing part

51: hollow part

52: connector part

521: concave part

6: bus bar

6A: bus for current supply

6B: grounding bus

6C: output bus

63: flexure

631: flexure

632: flexure

64: one end part

65: the other end part

8: cover

81: plate part

82: projection part

822: claw

20: body

201: flow path

202: side hole

203: gasket ring

204: internal thread

205: locating hole

30: screw rod

301: external thread

O3: center line

O30: intersection point

O31: center of a ship

O32: center of a ship

O33: center of a ship

Q: fluid, especially for a motor vehicle

VL 3-1: imaginary line

VL 3-2: imaginary line

VL 3-3: imaginary line

Detailed Description

Hereinafter, an embodiment of the sensor unit according to the present invention will be described with reference to fig. 1 to 4. 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. 3, 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 pressure sensor 2, a bus bar 6, a case 5, a cover 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 flowing 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 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.

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. 3, 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 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 at equal intervals in one direction parallel to the XY plane.

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. Then, the output of the pressure sensor 2 is transmitted to the outside via the output bus 6C.

The bus bar 6 has bent or curved flexible portions 63 at two points in the longitudinal direction (longitudinal direction). Of the two flexing portions 63, the flexing direction of the flexing portion 631 on one end side is around the X axis, and the flexing direction of the flexing portion 632 located on the other end side is around the Z axis. 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. 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.

Further, 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.

The cover 8 is detachably attached to the fixing portion 50 of the housing 5. The cover 8 has a plate portion 81 and a pair of protruding portions 82, and the pair of protruding portions 82 protrude from the plate portion 81 toward the lower side in the thickness direction, that is, toward the negative side in the Z-axis direction.

The plate portion 81 can cover the hollow portion 51 of the fixing portion 50 from above in a state where the cover 8 is 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 portion 51.

In the hollow portion 51, the plate portion 81 of the cover 8 is separated from the one end portion 64 of 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 the pressure variation of the fluid Q flowing through the flow path 201, the one end portion 64 of the bus bar 6 deforms following the movement. At this time, the plate portion 81 is away from the one end portion 64, so that the one end portion 64 is allowed to deform. This can maintain the electrical connection state between the bus bar 6 and each terminal 21 appropriately.

The pair of projections 82 are disposed apart from each other in the X-axis direction. Each of the projections 82 is formed of an elastically deformable elastic sheet. In the attached state, each of the projections 82 contacts the inner wall of the fixing portion 50, thereby fixing the cover 8 to the fixing portion 50. This can more reliably prevent the cap 8 from coming off the fixing portion 50, thereby preventing the interior of the hollow portion 51 from being unintentionally exposed and reliably protecting the interior of the hollow portion 51.

The protruding portion 82 has a claw 822 whose thickness gradually increases toward the plate portion 81. In the mounted state, the claws 822 may be hooked on an inner wall portion of the fixing portion 50. The cover 8 can be further reliably prevented from coming off the fixing portion 50 by the synergistic effect of the hooking of the claw 822 with the fixing portion 50 and the contact of the protruding portion 82 with the fixing portion 50.

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. 1 to 3, 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.

As shown in fig. 4, the bracket 3 has a sensor hole 31, two screw holes 32, and two housing holes 35.

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. 3, when the bracket 3 is fixed to the main body 20 via the screw 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.

Further, the one end 64 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 two screw holes 32 are disposed on both sides in the X-axis direction with the sensor hole 31 interposed therebetween. 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. 3, 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 two, but the present invention is not limited to this, and may be three 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 two case holes 35 are also disposed on both sides in the X-axis direction with the sensor hole 31 interposed therebetween. Each of the case holes 35 is disposed between the two screw holes 32, that is, at a position closer to the sensor hole 31 than the screw holes 32. Each housing hole 35 is a hole that penetrates in the Z-axis direction and fixes the housing 5. When the housing 5 is molded on the bracket 3, the liquid resin material constituting the housing 5 enters each housing hole 35 and is cured. Thereby, the housing 5 is fixed to the bracket 3. The shape of each case hole 35 in a plan view is not limited to the shape shown in fig. 4.

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.

As shown in fig. 4, the bracket 3 has an elongated shape and an asymmetrical (non-line-symmetrical with respect to the center line) outer shape with respect to the center line in the longitudinal direction. This prevents the bracket 3 from being used in a manner of being turned upside down. Here, the "center line O3" is a line parallel to the X-axis direction passing through the center O31 of the sensor hole 31.

As shown in fig. 2, the thickness direction of the bracket 3 is orthogonal to the longitudinal direction of the bus bar 6. Thus, for example, the sensor unit 1 can be reduced in size, particularly in the height direction, as compared with a configuration in which the thickness direction of the bracket 3 is the same as the longitudinal direction of the bus bar 6.

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, 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 of the sensor hole 31 can be brought into contact with the flange 22 of the pressure sensor 2 without positional deviation, and 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 41 that are press-fitted into the respective positioning holes 33. This allows the positioning unit 4 to have a simple structure.

As shown in fig. 4, 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 holes 33 are disposed at positions distant from the virtual line VL3-1, i.e., at positions not intersecting the virtual line VL3-1, and the virtual line VL3-1 connects the center O31 of the sensor hole 31 and the center O32 of the screw holes 32. This prevents the bracket 3 from being used, for example, in a front-back reverse manner.

An intersection O30 of an imaginary line VL3-2 connecting the centers O33 of the two positioning holes 33 and an imaginary line VL3-3 connecting the centers O32 of the two screw holes 32 is located inside the sensor hole 31 (on the contour line including the sensor hole 31). Thereby, the pressure sensor 2 can be stably and more uniformly pressed against the 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. 1, each positioning pin 41 is inserted into a positioning hole 205 provided in the main body 20 and fitted therein. 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 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.

In the present embodiment, the positioning portion 4 is disposed between the two screw holes 32. This is an effective configuration when the positioning portion 4 is disposed close to the sensor hole 31, for example.

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.

Further, the bracket 3 may be provided with two screw holes 32 between the two positioning holes 33.

The bracket 3 may have the screw holes 32 and the positioning holes 33 alternately arranged along the longitudinal direction of the bracket 3.

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 (8)

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

a plate-shaped bracket that presses the pressure sensor against the main body, the bracket having a sensor hole through which the pressure sensor is mounted, and two screw holes that are disposed across the sensor hole, penetrate in the thickness direction, and into which screws are inserted; and

and a positioning part for positioning the bracket relative to the body.

2. Sensor unit according to claim 1,

the positioning part is provided with at least one positioning hole penetrating along the thickness direction of the bracket.

3. Sensor unit according to claim 2,

the positioning hole is located away from an imaginary line connecting the center of the sensor hole and the center of the screw hole.

4. Sensor unit according to claim 2 or 3,

two positioning holes are disposed with the sensor hole therebetween.

5. Sensor unit according to claim 4,

an intersection point of an imaginary line connecting centers of the two positioning holes and an imaginary line connecting centers of the two holes for the screw is located inside the hole for the sensor.

6. Sensor unit according to claim 2 or 3,

the positioning part is provided with a positioning pin pressed into the positioning hole.

7. Sensor unit according to one of claims 1 to 3,

the positioning portion is disposed between the two screw holes.

8. Sensor unit according to one of claims 1 to 3,

the bracket is long and asymmetric with respect to a center line in a longitudinal direction thereof.

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