JP2000055718A - Level detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts required and the cost, and to enable easy assembly by detecting a level, by the change of the relative position between a detecting element and a movable part supported by a sensor body made of resin. SOLUTION: A level detector is composed of a measuring element 41 for measuring the quantity of oil and a sensor body 42 which is made of resin, supports this measuring element 41, and is fitted to an apparatus to be fitted such as an oil pan and so on. The measuring element 41 is composed of a detecting element 43, a guide cylinder 44 which is made of resin and houses this detecting element, 43, and a movable part such as a float 45 fitted outside this guide cylinder 44 in such a way as to be able to rise or fall freely and so on. The float 45 of the measuring element 41 is floated up to a height corresponding to the liquid surface of oil inside the oil pan along the guide cylinder 44. At this time, a magnet 71 fitted inside the float 45 properly turns on and off a plurality of lead switches 48, 49 put on a board 50 inserted and arranged inside the guide cylinder 44, and the quantity of the oil inside this oil pan is detected by this on/off pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level detector.

[0002]

2. Description of the Related Art For example, a level detector such as an oil meter is attached to an oil pan of an engine.

As shown in FIGS. 23 to 28, a conventional level detecting device such as an oil meter measures a measuring unit 1 for measuring an oil amount.
And a resin sensor main body 2 that supports the measuring section 1 and is attached to a device to be attached such as an oil pan.

The measuring unit 1 comprises a detecting unit 3, a copper guide tube 4 for accommodating the detecting unit 3, and a movable unit such as a float 5 fitted to the guide tube 4 so as to be vertically movable. ing.

[0005] The detecting section 3 is formed by mounting a plurality of electronic components such as reed switches 7 and 8 which are turned on / off by a magnetic field, with their positions shifted in the vertical direction, on the printed board 6. Terminals 9 and 1 at the upper end
0 is attached. The terminal portions 9 and 10 have holes 1
1 is formed. The upper and lower ends of the copper guide cylinder 4 are open, and the printed circuit board 6 is inserted from the upper end side. At the lower end of the copper guide tube 4, a pair of locking projections 12 for locking to the sensor main body 2 are formed in a projecting manner. Furthermore, the guide tube 4 made of copper
Rubber elastic bodies 13 are respectively attached to the upper and lower ends. The float 5 has a built-in magnet 14 for generating a magnetic field for turning on and off the reed switches 7 and 8.

The sensor main body 2 has a mounting portion 15 such as a flange for mounting to a device to be mounted such as an oil pan.
An insertion portion 16 inserted into the oil pan from an opening formed in the oil pan, a support portion 17 supporting the measuring portion 1, and a connector portion for connecting the measuring portion 1 to an external device. 18.

[0007] The insertion portion 16 is a mounting portion 1 such as a flange.
5 extends substantially horizontally, and a seal member 19 such as an O-ring is fitted around a portion near the mounting portion 15. The support portion 17 is formed at the tip of the insertion portion 16 (on the side opposite to the mounting portion 15), and supports an upper end support portion 20 and a lower end support portion 21 that support the upper and lower ends of the guide tube 4 that constitutes the measuring portion 1.
And a connecting portion 22 that connects between the upper end supporting portion 20 and the lower end supporting portion 21. The lower end support portion 21 has a locking projection 1 formed at the lower end of the guide cylinder 4.
A lock hole 23 is formed to penetrate through the hole 2 and bend and lock.

[0008] The connector section 18 is provided with a flexible hose 24 extending from the mounting section 15 to the side opposite to the measuring section 1, a connector 25 attached to a tip of the hose 24, and inside the hose 24. Then, it is composed of a pair of lead wires 26 and 27 for connecting between the terminal of the connector 25 and the terminal portions 9 and 10 of the measuring section 1. The lead wires 26 and 27 are multi-core wires, one end of which is embedded in the insertion portion 16 when the sensor main body 2 is formed, and the lead wires 26 and 2 embedded in the insertion portion 16.
7 has a core portion 28 from which the covering portion has been removed,
6 is fixed in a state of being exposed to the outside from the tip.
The hose 24 is externally fitted to the other ends of the lead wires 26 and 27 after the sensor main body 2 is formed, and one end of the hose 24 is sealed to the insertion portion 16 by a sealing material 29 such as an epoxy adhesive. So-called potting).

According to such a configuration, the printed circuit board 6 is inserted into the guide tube 4 from above, the float 5 is fitted to the guide tube 4 so as to be able to move up and down, and furthermore, the upper and lower ends of the guide tube 4 The measuring part 1 is assembled by attaching the rubber elastic bodies 13 respectively.

Next, the measuring section 1 is connected to the upper end supporting section 20 and the lower end supporting section 2 of the supporting section 17 of the sensor body 2 from the side.
Install between 1 At this time, the locking projection 12 formed at the lower end of the guide tube 4 is first inserted into and locked in the locking hole 23 formed in the lower end support portion 21, and then the upper end of the guide tube 4 is connected to the upper end support portion 20. Finally, the core portions 28 of the lead wires 26 and 27 are inserted into the holes 11 formed in the terminal portions 9 and 10 of the printed circuit board 6, and both are connected and fixed by soldering or the like.

When the measuring section 1 is attached to the support section 17 of the sensor main body 2, the hose 2 is connected to the other ends of the lead wires 26 and 27.
4 and the connector 25 is connected and fixed to the other ends of the lead wires 26 and 27 by soldering or the like. Finally, one end of the hose 24 is sealed with a sealing material 29 such as an epoxy adhesive. The adhesive is fixed to 16 and sealed.

A sensor such as an oil meter manufactured as described above has an insertion portion 16 of the sensor main body 2 and a measuring portion 1 attached to an oil pan through an opening formed in a device to be attached such as an oil pan. The support member 17 is inserted and the guide tube 4 is inserted.
The mounting part 1 such as a flange with the
5 is fixed to the outer surface of the oil pan with bolts or the like, and a connector 25 provided at the other end of the hose 24 is provided.
To an external device. At this time, the seal between the oil pan and the sensor main body 2 is performed by the seal member 19 fitted on the insertion portion 16.

When the float 5 of the measuring section 1 floats along the guide cylinder 4 to a height corresponding to the level of the oil in the oil pan, the magnet 14 provided inside the float 5 guides the float. A plurality of reed switches 7, 8 on a printed circuit board 6 inserted and arranged inside the cylinder 4 are turned on / off as appropriate, and the oil amount inside the oil pan is detected by this on / off pattern.

[0014]

However, in such a conventional level detecting device, the printed circuit board 6 is formed separately by an epoxy substrate or the like, and thus there is a problem that the number of components is increased.

Further, since the measuring section 1 is attached from the side between the upper end supporting section 20 and the lower end supporting section 21 of the supporting section 17 of the sensor main body 2, there is a problem that the assembly is troublesome. .

Furthermore, since the guide tube 4 made of copper is used, there is a problem that parts costs are increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a level detecting device which has a small number of parts, is inexpensive, and can be easily assembled.

[0018]

In order to solve the above problem, according to the first aspect of the present invention, a connector is formed at one end, and a substrate portion forming a detection unit is formed at the other end.
A resin sensor main body having an L-shape as a whole, a connection terminal of the connector extended to the substrate portion, and an electronic component mounting portion formed at an end of the extension portion; A movable section and a detection section supported by the sensor body; and a level is detected by a change in a relative position between the movable section and the detection section.

According to the second aspect of the present invention, the base portion has a free end at the distal end and an elastic member provided around the base, and the base portion guides one opening from the free end side. When the guide tube covers the entire substrate portion when inserted into the tube, the elastic member and the distal end portion of the guide tube are elastically fitted, and the inside of the guide tube is hermetically sealed by the elastic fitting force. Characteristic is maintained.

According to the third aspect of the present invention, a locking portion is provided at an end opposite to the opening of the guide tube, and a tube end support member is provided extending from the base portion of the substrate. The locking portion is locked to a tube end supporting member.

In the invention described in claim 4, the cylinder end supporting member extends in the same direction as the extending direction of the substrate portion, and a locking portion formed at the distal end portion of the guide cylinder. Is locked.

In the invention described in claim 5, a guide portion having a diameter substantially equal to the inner diameter of the guide tube is provided at the tip of the substrate portion, and the guide portion is formed by the guide tube being formed by the guide tube. When covered, it is located at or near the bottom surface of the guide tube.

According to a sixth aspect of the present invention, when the locking portion is locked to the sensor main body, the tip of the substrate portion contacts and supports the bottom of the guide tube.

[0024]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 12 show a first embodiment of the present invention.
It shows.

First, the configuration will be described. The level detecting device such as an oil meter according to the first embodiment includes a measuring unit 41 for measuring the oil amount, and a measuring unit 41 supporting the measuring unit 41 such as an oil pan. And a sensor body 42 made of resin containing 66 nylon glass to be attached to the attachment device.

The measuring section 41 comprises a detecting section 43, a guide tube 44 for accommodating the detecting section 43, and a movable portion such as a float 45 which is fitted to the guide tube 44 so as to be vertically movable. .

The sensor main body 42 has a mounting portion 46 such as a flange for mounting to a device to be mounted such as an oil pan.
And an insertion portion 47 inserted into the oil pan from an opening formed in the oil pan, and a plurality of electronic components such as reed switches 48 and 49 which are turned on / off by a magnetic field, and mounted on the detection portion. The substrate part 50 to be 43
And a tube end supporting member 51 erected on the insertion portion 47 and extending parallel to the extending direction of the substrate portion 50 to lock and fix the guide tube 44, and connect the reed switches 48 and 49 to external devices. The sensor main body 42 is integrally formed of resin, including the board portion 50 and the connector 52.

The insertion portion 47 is provided with a mounting portion 4 such as a flange.
6 extends substantially in the horizontal direction, a ring groove is formed in the vicinity of the mounting portion 46 of the insertion portion 47, and a sealing material 53 such as an O-ring is fitted in the ring groove. The board portion 50 extends substantially vertically upward or downward (downward in the figure) from the tip (the opposite side of the mounting portion 46) of the substantially horizontal insertion portion 47, and the upper end position of the board portion 50 is set. A fitting portion 54 having a diameter substantially equal to the inner diameter of the guide cylinder 44 is formed at the (base portion), and a sealing material 55 such as an O-ring is externally fitted in a ring groove formed in the fitting portion 54. ing. Also, at the lower end (tip) of the substrate section 50,
Disc-shaped guide portion 56 having a diameter substantially equal to the inner diameter of guide tube 44
Is formed, and the bottom surface of the guide portion 56 can be contacted and supported by the bottom surface of the guide cylinder 44 (see FIG. 1).
In the above, the bottom surface of the guide portion 56 is not in contact with the bottom surface of the guide cylinder 44, but this is for absorbing a dimensional error. Ideally, it is better to make contact with the bottom surface. Also, it is assumed that the bottom surface of the guide portion 56 is in contact with the bottom surface of the guide cylinder 44 even when there is a position. The connector 52 includes:
It is formed directly on the opposite side of the mounting section 46 from the measurement section 41.

Inside the sensor main body 42, two strip-shaped metal plates 57 and 58 called bus bars are embedded as conductors by insert molding. The two metal plates 57, 58 are formed by horizontal portions 57a, 58 extending substantially horizontally inside the mounting portion 46 and the insertion portion 47.
The ends of the horizontal portions 57a, 58a protrude outside the resin at the connector 52 and serve as terminals 59 of the connector 52 as they are. Then, the two metal plates 57 and 58 are bent downward at the upper part of the fitting portion 54,
The whole is formed substantially in an L shape, and
Is partially exposed to the outside of the resin at the bottom. The vertical portion of one of the two metal plates 58 stops when it reaches the upper end (base end) of the substrate portion 50 past the fitting portion 54. The vertical portion 60 of the remaining one metal plate 57 reaches almost the lower end (tip) of the substrate portion 50. And
As shown in FIG. 11, the surface of the vertical portion 60 is orthogonal to the electronic component mounting surface 61 of the substrate 50 and is disposed along the side of the substrate 50. At this time, the two metal plates 57 and 58 are embedded in the sensor main body 42 with the surface directions of the horizontal portions 57a and 58a facing forward and backward.
An out-of-plane bending of about 90 ° is applied to the plane direction of a.

Further, the electronic component mounting surface 6 is provided on the substrate 50.
Mounting grooves 64, 65 and mounting holes 66, 67 for retrofitting two other metal wiring members 62, 63 are formed on the back side of the electronic component mounting surface 61, and two on the back side of the electronic component mounting surface 61. The metal wiring members 62, 63 are brought into contact with each other, and the metal wiring members 62, 6
The metal wiring members 62 and 63 can be easily mounted by inserting and bending the legs 68 and 69 projecting from the third through the mounting holes 66 and 67. A plurality of the reed switches 48 and 49 are mounted between the vertical portions of the two metal plates 57 and 58 and the metal wiring members 62 and 63 so as to be vertically displaced. A plurality of support projections 70 are formed on the electronic component mounting surface 61 of the substrate 50 so as to sandwich and support (temporarily fix) the terminal wires of the reed switches 48 and 49.

The cylindrical end support member 51 has a curved surface having an arcuate cross section, and has, for example, a partial cylindrical shape corresponding to the curvature of the float 45.

On the other hand, the guide cylinder 44 accommodates the substrate section 50 as described above, and
A float 45 in which a magnet 71 for generating a magnetic field for turning on / off the power supply 49 is incorporated.
Is guided up and down freely. In addition, an opening that can be inserted into the substrate unit 50 from the front end side (lower side) is formed at the upper end, and the bottom is closed to seal the inside. The substrate 50
Is extended upward, the upper end is closed and an opening is formed at the lower end. At the closed bottom of the guide cylinder 44, a cylinder bottom member 72 is provided.
Between the cylinder bottom member 72 and the cylinder end supporting member 51 of the sensor main body 42, a locking portion 73 for locking and fixing the guide cylinder 44 to the sensor main body 42 is provided. This locking portion 73
For example, a receiving frame portion 74 formed on the outer surface side of the cylinder end supporting member 51, an insertion piece 75 that can be inserted into the receiving frame portion 74 formed to rise from the cylinder bottom member 72, and an insertion piece 75 Vertically extending slit 7 formed in
6, formed on the outer surface side of the cylinder end supporting member 51;
And a locking claw 77 fitted and locked to the slit 76. Then, the guide cylinder 44 and the cylinder bottom member 72
The insertion piece 75 of the locking portion 73 and the insertion piece 75 of the locking portion 73 are integrally formed of resin to form a substrate holding portion 78.

Next, the operation of the first embodiment will be described.

First, the detection unit 43 is constructed by attaching electronic components such as the metal wiring members 62 and 63 and the reed switches 48 and 49 to the substrate 50 formed integrally with the sensor main body 42.

Then, the float 45 is externally fitted to the guide tube 44 constituting the substrate holding portion 78 so as to be vertically movable.
4 is inserted into the substrate unit 50 from below. At this time, the substrate 5
The guide tube 44 is inserted by being guided by the guide portion 56 formed at the lower end of the “0”. Then, the upper end of the guide tube 44 is fitted into the fitting portion 54 formed at the upper end position of the substrate portion 50, and the upper end of the guide tube 44 is fitted and fixed, and the O fitted outside the fitting portion 54 is fitted. The upper end of the guide cylinder 44 is sealed by a seal member 55 such as a ring.

On the way, an insertion piece 75 formed upright from the cylinder support 17 is inserted into a receiving frame 74 formed on the outer surface side of the cylinder end support member 51. Then, a locking claw 77 formed on the outer surface side of the cylinder end support member 51 is fitted into a vertically extending slit 76 formed on the insertion piece 75, and a cylinder bottom member at the lower end of the guide cylinder 44. 72 is locked to the cylinder end supporting member 51 and the substrate 50
Becomes a double-supported state.

At this time, the fitting portions 54 and the guide portions 56 formed at the upper and lower ends of the substrate portion 50 are fitted into the guide cylinder 44 without any gap, so that the rattling of the substrate portion 50 is prevented. Also,
Since the bottom surface (or the peripheral surface) of the guide portion 56 is supported in contact with the bottom surface of the guide tube 44, the lower end of the substrate portion 50 is more firmly fixed.

During the operation of storing the substrate 50 in the guide tube 44, the peripheral surface of the guide portion 56 of the substrate portion 50 is always in contact with the inner peripheral surface of the guide tube 44. Edge and reed switch 48, 4 mounted on substrate 50
9 does not strike and does not damage parts.

The sensor such as an oil meter manufactured in this manner inserts the insertion portion 47 of the sensor main body 42 and the substrate portion 50 into the oil pan through an opening formed in the oil pan, and forms a flange or the like. The mounting portion 46 is in contact with the outer surface of the oil pan and fixed with bolts or the like, and an external device is connected to the connector 52 provided on the other end of the mounting portion 46.
At this time, the rubber elastic body 13 between the oil pan and the sensor main body 42
To be done.

Then, the float 45 of the measuring section 41 is floated along the guide cylinder 44 made of resin to a height corresponding to the liquid level of the oil in the oil pan.
A plurality of reed switches 48 and 49 on the substrate 50 inserted and arranged in the guide tube 44 made of resin are appropriately turned on and off by a magnet 71 provided inside the guide tube 44 made of a resin. The amount of oil inside is detected.

As described above, according to the present embodiment, by forming the substrate portion 50 integrally with the sensor main body 42, the structure can be simplified and the number of components can be reduced. Also,
Since there is no need to attach the substrate unit 50 to the sensor main body 42, assembly can be facilitated.

Further, by inserting the guide cylinder 44 into the substrate portion 50 from above or below, the insertion of the guide cylinder 44,
Assembly can be facilitated.

Further, by fixing the end of the guide tube 44 on the tip end side of the substrate portion 50 to the sensor main body 42 via the locking portion 73, even if the substrate portion 50 is elongated, both ends are formed from the upper side and the lower side. The guide tube 44 can be supported and fixed while being held, and the guide tube 44 can be securely locked to the sensor main body 42. In addition, the float 45 can be prevented from coming off from the guide tube 44 during assembly.

Further, since the substrate portion 50 can be supported in a double-supported state, even if a contraction distortion of the resin occurs in the substrate portion 50, it can be corrected, and the movement of the float 45 can be made smooth. .

Further, by integrally molding the guide tube 44 and the locking portion 73 with resin, the guide tube 44 can be obtained easily and inexpensively, and the number of parts can be reduced. Further, since the locking portion 73 is locked by inserting the guide tube 44 in the axial direction, the guide tube 44 can be
Can be locked and fixed to the sensor main body 42.

Further, by forming a guide portion 56 having a diameter substantially equal to the inner diameter of the guide tube 44 at the tip of the substrate portion 50, the guide tube 44 can be smoothly inserted while being guided by the guide portion 56, It is possible to prevent electronic components and the like mounted on the substrate unit 50 from being damaged. In addition, the guide portion 56 can prevent rattling between the lower end of the guide tube 44 and the tip of the substrate portion 50.

Further, since the tip of the substrate 50 is supported in contact with the bottom of the guide tube 44, a support state can be obtained between the tip of the substrate 50 and the bottom of the guide tube 44.

[0049]

Second Embodiment FIGS. 13 to 17 show a second embodiment of the present invention. Note that the same or equivalent parts as those in the first embodiment are described with the same reference numerals.

In the second embodiment, the guide cylinder 44
The locking portion 73 between the cylinder bottom member 72 attached to the cylinder body and the cylinder end support member 51 of the sensor body 42 accommodates the lower portion of the cylinder end support member 51 formed upright from the cylinder bottom member 72. A possible receiving frame portion 81, a vertically extending slit 82 formed in the receiving frame portion 81, and a fitting that is fitted and locked to the slit 82 formed on the outer surface side of the cylindrical end support member 51. The claw 83 is used.

Also in this case, the guide cylinder 44 can be locked and fixed to the sensor body 42 without any trouble.

Except for the above, the present embodiment has the same configuration as that of the above-described embodiment, and the same operation and effect can be obtained.

[0053]

Third Embodiment FIGS. 18 to 22 show a third embodiment of the present invention. In addition, the same or equivalent parts as those in the above embodiments will be described with the same reference numerals.

In the third embodiment, the guide cylinder 44
A locking claw 85 formed on the outer surface of the cylinder end support member 51 is provided with a locking portion 73 between the cylinder bottom member 72 attached to the cylinder end and the cylinder end support member 51 of the sensor body 42, A locking piece 86 is formed so as to rise from the cylinder bottom member 72 and locked by the front locking claw 85.

Even in this case, the guide cylinder 44 can be locked and fixed to the sensor body 42 without any trouble.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

[0057]

As described above, according to the first aspect of the present invention, the connector is formed at one end and the substrate constituting the detecting section is formed at the other end, and the whole is formed in an L-shape. In addition, the connection terminal of the connector is extended to the substrate portion, and a resin sensor main body having an electronic component mounting portion formed at an end of the extension portion is provided, and is supported by the resin sensor main body. The structure is simplified and the number of parts can be reduced by providing a movable part and a detection part and detecting the level by a change in the relative position between the movable part and the detection part. Also, since it is not necessary to attach the substrate to the sensor body, assembly can be facilitated.

According to the second aspect of the present invention, the substrate portion has a free end at the front end and an elastic member provided around the base, so that the substrate portion is inserted into the guide cylinder which is open at one end from the free end. When inserted, when the guide tube covers the entire substrate portion,
By elastically fitting the elastic member and the distal end of the guide tube, the elastic fitting force allows the inside of the guide tube to be kept watertight and airtight.

According to the third aspect of the present invention, a locking portion is provided at an end opposite to the opening of the guide tube, and a tube end supporting member is extended from the base of the substrate portion. By locking the locking portion to the support member, the substrate portion can be supported and fixed in a double-supported state even if the substrate portion is elongated, and the guide cylinder can be reliably locked to the sensor main body. Moreover, it is possible to prevent a float or the like from coming off from the guide tube during assembly.

Further, since the substrate portion can be supported in a double-supported state, even if a contraction distortion of the resin occurs in the substrate portion, it can be corrected, and the movement of the float or the like can be smoothed.

According to the fourth aspect of the present invention, the cylinder end supporting member extends in the same direction as the extending direction of the substrate portion, and the locking portion formed on the guide cylinder is locked at the tip thereof. This allows the guide tube to be inserted into the base plate, thereby locking the guide tube, thereby facilitating insertion and assembly of the guide tube.

According to the fifth aspect of the present invention, a guide portion having a diameter substantially equal to the inner diameter of the guide tube is provided at the distal end portion of the substrate portion, and the guide portion is provided when the substrate portion is covered by the guide tube. By being located at or near the bottom surface of the guide tube, the guide tube can be smoothly inserted while being guided by the guide portion, and damage to electronic components and the like mounted on the substrate portion can be prevented. . Further, the guide portion can prevent rattling between the lower end of the guide tube and the tip of the substrate portion.

According to the sixth aspect of the present invention, when the locking portion is locked to the sensor main body, the tip of the substrate contacts the bottom of the guide tube so that the tip of the substrate and the bottom of the guide tube are in contact with each other. And a practically useful effect that a supporting state can be obtained between the two.

[Brief description of the drawings]

FIG. 1 is a partially cutaway right side view of a level detection device according to Embodiment 1 of the present invention.

FIG. 2 is an exploded view of FIG.

FIG. 3 is a front view of a sensor main body.

FIG. 4 is a left side view of the sensor main body.

FIG. 5 is a bottom view of the level detection device of FIG. 1;

FIG. 6 is an enlarged view of the substrate unit of FIG. 2;

FIG. 7 is a rear view of the substrate unit.

FIG. 8 is an exploded view of FIG. 7;

FIG. 9 is an enlarged view of the substrate unit of FIG. 4;

FIG. 10 is a left side view of a pair of metal plates.

11A and 11B show one metal plate, wherein FIG. 11A is a left side view, FIG. 11B is a plan view, and FIG. 11C is a front view.

12A and 12B show the other metal plate, wherein FIG. 12A is a left side view, FIG. 12B is a plan view, and FIG. 12C is a front view.

FIG. 13 is a right side view of the level detection device according to the second embodiment of the present invention.

FIG. 14 is a right side view of the sensor main body of FIG.

FIG. 15 is a bottom view of FIG.

FIG. 16 is a right side view of the substrate holding unit of FIG.

FIG. 17 is a bottom view of FIG. 16;

FIG. 18 is a right side view of the level detector according to Embodiment 3 of the present invention.

FIG. 19 is a right side view of the sensor main body of FIG. 18;

FIG. 20 is a bottom view of FIG. 19;

FIG. 21 is a right side view of the substrate holding unit of FIG.

FIG. 22 is a bottom view of FIG. 21.

FIG. 23 is a right side view of a level detector according to a conventional example, partially cut away.

FIG. 24 is a partially enlarged view of FIG. 23;

FIG. 25 is a front view of the detection device of FIG. 23.

FIG. 26 is a bottom view of the detection device of FIG. 23.

FIG. 27 is an exploded view of FIG. 24.

FIG. 28 is an exploded front view of the measurement unit in FIG. 27.

[Explanation of symbols]

 41 Measuring unit 42 Sensor body 43 Detecting unit 44 Guide cylinder 45 Float (movable part) 48, 49 Reed switch 50 Substrate unit 51 Tube end support member 56 Guide unit 71 Magnet 73 Locking unit

Claims (6)

[Claims] A connector is formed at one end, and a board constituting a detection section is formed at the other end, the whole is formed in an L-shape, and connection terminals of the connector extend to the board. Extended, comprising a resin sensor body in which an electronic component mounting portion is formed at the tip of the extension portion, and comprising a movable portion and a detection portion supported by the resin sensor body,
A level detecting device, wherein a level is detected based on a change in a relative position between the movable portion and the detecting portion. 2. The substrate section has a free end at a tip end,
And an elastic member is provided around the base, and when the substrate portion is inserted into the guide tube having one end opening from the free end side and the guide tube covers the entire substrate portion, the elastic member and the guide are provided. 2. The level detecting device according to claim 1, wherein the distal end of the tube is elastically fitted, and the elastic fitting force maintains the inside of the guide tube in a watertight manner. 3. A guide portion is provided at an end opposite to the opening of the guide tube, and a tube end support member is extended from the base portion of the substrate portion. The level detecting device according to claim 1, wherein the stop portion is locked. 4. The cylinder end support member extends in the same direction as the direction in which the substrate section extends, and a locking portion formed on the guide cylinder is locked at a distal end thereof. The level detection device according to claim 3, wherein 5. A guide portion having a diameter substantially equal to the inner diameter of the guide tube is provided at a tip portion of the substrate portion, and the guide portion is provided when the substrate portion is covered by the guide tube. 5. The level detecting device according to claim 4, wherein the level detecting device is located at or near the bottom surface. 6. When the locking portion is locked to the sensor body,
The level detecting device according to any one of claims 3 to 5, wherein a tip of the substrate portion is in contact with and supported by a bottom portion of the guide cylinder.