JP2004101353A - Liquid level detector for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid level detector for a vehicle, which can improve the working property in mounting an ultrasonic sensor on a fuel tank, by devising a fixing method for the ultrasonic sensor and the fuel tank. <P>SOLUTION: In the liquid level detector, a support wall 31 for regulating the movement of a fuel liquid level sensor 2 along the bottom surface 33 is provided to the bottom surface 33 of the fuel tank 3, and a hole part 32 is provided to the support wall 31. A sticking out part 25 which is fitted into the hole part 32 and which regulates the movement of the fuel liquid level sensor 2 in a direction apart from the bottom surface 33 is provided to the fuel liquid level sensor 2. Thus, the fuel liquid level sensor 2 can be securely mounted on the fuel tank 3, by a simple work of pushing the fuel liquid level sensor 2 toward the bottom surface 33 of the fuel tank 3. Accordingly, troublesome works of screwing a plurality of screws in a conventional liquid level detector for a vehicle are abolished, thereby realizing the fuel liquid level detector 1 which can improve the working property in mounting the fuel liquid level sensor 2 on the fuel tank 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid level detecting device for a vehicle that is mounted on a vehicle and detects a liquid level of a liquid, and is suitable for use in, for example, an application for detecting a liquid level in a fuel tank mounted on an automobile. is there.
[0002]
[Prior art]
Conventionally, as a vehicle liquid level detecting device for detecting the amount of fuel in an automobile or the like, that is, a fuel level, a rotating arm is provided on a float floating on the surface of the fuel, and the position of the float is changed according to a change in the liquid level. In general, a turning arm is turned, and a change in the turning angle is converted into a change in electric resistance, for example. However, this type of liquid level detection device has problems such as a large physique, a limited installation place, and poor detection accuracy.
[0003]
In order to solve such a problem, for example, in a liquid level detection device disclosed in Japanese Patent Laid-Open No. 6-249697, an ultrasonic sensor having an ultrasonic vibrator is mounted on the bottom of a fuel tank, and the ultrasonic sensor is used. Ultrasonic waves are emitted to the fuel in the fuel tank, and the ultrasonic waves are reflected on the fuel level and received by the ultrasonic sensor again, and the time for the ultrasonic waves to reciprocate between the ultrasonic sensor and the liquid level is measured. The liquid surface position is detected based on this. However, Japanese Patent Application Laid-Open No. 6-249697 has no specific description of a structure for attaching an ultrasonic vibrator to a tank.
[0004]
[Problems to be solved by the invention]
On the other hand, as a liquid level detecting device using an ultrasonic sensor, there is a device disclosed in JP-A-2000-314651 or JP-A-2001-208595.
[0005]
In the liquid level detecting device disclosed in Japanese Patent Application Laid-Open No. 2000-314651, the ultrasonic sensor is pressed against the tank by the elastic force of a spring and is fixed to the tank by the magnetic force of a magnet. In this case, since the number of parts is large and the configuration is complicated, there is a problem of an increase in cost and an increase in the number of assembly steps. Further, since magnetic force is used for fixing the ultrasonic sensor to the tank, materials other than magnetic metal cannot be used as the material of the tank.
[0006]
In the liquid level detection device disclosed in Japanese Patent Application Laid-Open No. 2001-208595, the ultrasonic sensor is fixed with a plurality of screws. Also in this case, since the number of parts is large and the configuration is complicated, there is a problem of an increase in cost and an increase in the number of assembly steps.
[0007]
The present invention has been made in view of the above points, and an object thereof is to improve the workability of mounting an ultrasonic sensor to a tank by devising a method of fixing the ultrasonic sensor to the tank. A liquid level detection device is provided.
[0008]
[Means for Solving the Problems]
The present invention employs the following technical means to achieve the above object.
[0009]
According to a first aspect of the present invention, there is provided a liquid level detecting device for a vehicle, comprising: a tank for storing a liquid; and an ultrasonic detector having a built-in ultrasonic vibrator and attached to an outer surface of the tank. A liquid level detecting device for a vehicle that emits ultrasonic waves to a liquid in a tank to measure the liquid level, the first restricting portion being provided on the outer surface of the tank and restricting movement along the outer surface of the ultrasonic detector. A second regulating portion provided in the first regulating portion, and a third regulating portion which engages with the second regulating portion to regulate movement of the ultrasonic detector in a direction away from the outer surface of the tank, The three regulating portions are formed integrally with the ultrasonic detector. Accordingly, in the step of attaching the ultrasonic detector to the tank, the outside of the tank of the ultrasonic detector can be performed by one operation of engaging the third restricting portion of the ultrasonic detector with the second restricting portion of the tank. The movement along the surface and the movement away from the outer surface of the tank are restricted, that is, the fixing of the ultrasonic detector to the tank is completed. Therefore, it is possible to realize a liquid level detecting device for a vehicle that can improve the workability of attaching the ultrasonic detector to the tank.
[0010]
In the liquid level detecting device for a vehicle according to the second aspect of the present invention, the third regulating portion is formed on a stopper which is a separate component independent of the ultrasonic detector. Thus, by one operation of engaging the third regulating portion of the stopper with the second regulating portion of the tank, the ultrasonic detector moves along the outer surface of the tank and moves in a direction away from the outer surface of the tank. The movement is restricted, that is, the fixing of the ultrasonic detector to the tank is completed. Therefore, it is possible to realize a liquid level detecting device for a vehicle that can improve the workability of attaching the ultrasonic detector to the tank.
[0011]
In the liquid level detecting device for a vehicle according to the third aspect of the present invention, the tank is made of a resin material, and the first regulating portion is formed integrally with the tank. Thereby, the number of parts can be reduced and the cost can be reduced. In addition, it is possible to improve the positional relationship accuracy between the first regulating unit and the ultrasonic surface detector.
[0012]
In the liquid level detecting device for a vehicle according to a fourth aspect of the present invention, the ultrasonic detector is attached to the tank by pressing the ultrasonic detector or the stopper in a direction toward the outer surface of the tank. As a result, it is possible to realize a liquid level detecting device for a vehicle that can improve the workability of attaching the ultrasonic detector to the tank.
[0013]
In the liquid level detecting device for a vehicle according to the fifth aspect of the present invention, the ultrasonic detector or the stopper is rotated along the outer surface while pressing the ultrasonic detector or the stopper in the direction toward the outer surface of the tank so that the ultrasonic detector is in the tank. It is configured to be attached to. As a result, it is possible to realize a liquid level detecting device for a vehicle that can improve the workability of attaching the ultrasonic detector to the tank.
[0014]
In the liquid level detecting device for a vehicle according to claim 6 of the present invention, the ultrasonic detector is attached to the bottom surface or the side surface of the tank. Thereby, the ultrasonic wave emitted from the ultrasonic detector can be reliably advanced in the liquid in the tank, and the liquid level can be detected.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example in which a vehicle liquid level detecting device according to an embodiment of the present invention is applied to a fuel level detecting device 1 for detecting a fuel level position in a fuel tank of an automobile will be described with reference to the drawings. I do.
[0016]
(1st Embodiment)
FIG. 1 is a cross-sectional view showing a mounting state of a fuel level sensor 2 which is an ultrasonic detector to a fuel tank 3 which is a tank in the fuel level detecting apparatus 1 according to the first embodiment of the present invention. FIG. 2 is an enlarged sectional view of a part I in FIG. FIG. 2 is an overall external view of the fuel liquid level detecting device 1. FIG. 3 is a view taken in the direction of the arrow III in FIG. In each drawing, the same components are denoted by the same reference numerals.
[0017]
As shown in FIG. 2, the fuel level sensor 2, which is an ultrasonic detector, is fixed to a bottom surface 33, which is an outer surface of a fuel tank 3 of an automobile, which is a tank for storing liquid. The vertical direction in FIG. 2 is the vertical direction of the automobile, and the upper side of FIG. 2 is the upper side of the automobile.
[0018]
Hereinafter, the configuration of the fuel level detecting device 1 will be described.
[0019]
First, the fuel level sensor 2 which is an ultrasonic detector will be described.
[0020]
The ultrasonic vibrator 21 is formed of a substance having a piezo effect (a property of changing a volume when a voltage is applied and generating a voltage when externally applied), for example, PZT (lead zirconate titanate). ing. As shown in FIG. 1, the ultrasonic transducer 21 is connected to a lead wire 26 for applying a voltage from the outside or outputting a generated voltage signal to the outside. The ultrasonic transducer 21 is fixed to the housing 22 by, for example, bonding.
[0021]
The housing 22 is formed of a highly rigid material, for example, a metal (stainless steel plate or the like), and serves to protect the ultrasonic vibrator 21 and reliably transmit the vibration of the ultrasonic vibrator 21 to the outside. The housing 22 is held by a resin case 24. Here, the housing 22 is held by a resin case 24 via a vibration isolating member 23 made of a material that is flexible and can absorb vibration. This prevents the vibration of the ultrasonic transducer 21 from being transmitted to other than the fuel in the fuel tank 3 and maintains a good fuel level detection function.
[0022]
The case 24 is formed in a substantially disk shape as shown in FIG. As shown in FIGS. 1 and 3, the case 24 has two projecting portions 25 that are third regulating portions that engage with holes 32 that are second regulating portions of the fuel tank 3 to be described later. Are provided facing each other. When the fuel level sensor 2 is attached to the fuel tank 3, the protruding portion 25 engages with and abuts on the hole 32 of the fuel tank 3 to move the fuel level sensor 2 away from the bottom surface 33 of the fuel tank 3. Is regulated. In other words, the protruding portion 25 is engaged with and abutted on the hole 32 of the fuel tank 3, and the fuel level sensor 2 is held and fixed to the fuel tank 3.
[0023]
Next, the fuel tank 3, which is a tank, will be described.
[0024]
The fuel tank 3 is formed of a resin material. As shown in FIGS. 1 and 3, the bottom surface 33 of the fuel tank 3 is provided with a first movement restricting movement of the fuel level sensor 2 along the bottom surface 33, that is, a movement in the left-right direction in FIG. 1. Two support walls 31 serving as regulating portions are provided so as to face each other. The support wall 31 is formed in an arc shape corresponding to the outer shape of the fuel level sensor 2 as shown in FIG. The support wall 31 is provided with a hole 32 as a second restricting portion for restricting the movement of the fuel level sensor 2 in a direction away from the bottom surface 33. As shown in FIG. 1, the hole 32 is formed in a shape of a through hole substantially parallel to the bottom surface 33. The support wall 31 is formed integrally with the fuel tank 3 during resin molding of the fuel tank 3.
[0025]
Next, a method of attaching the fuel level sensor 2 to the fuel tank 3 in the assembling step of the fuel level detecting device 1 according to the first embodiment of the present invention will be described.
[0026]
First, the substantially circular sheet-like adhesive 4 is set between the two support walls 31 on the bottom surface 33 of the fuel tank 3.
[0027]
Next, the circumferential position of the projecting portion 25 of the fuel level sensor 2 and the hole 32 of the support wall 31 of the fuel tank 3 is set between the two support walls 31 of the fuel tank 3 by positioning the fuel level sensor 2. Then, the housing 22 is pushed in with the housing 22 facing the bottom surface 33. That is, the fuel level sensor 2 is pressed in a direction toward the bottom surface 33 of the fuel tank 3. As a result, the support wall 31 is elastically deformed in the left-right direction in FIG. When the fuel level sensor 2 is further pushed in, the protrusion 25 of the fuel level sensor 2 engages with the hole 32 of the support wall 31 of the fuel tank 3, that is, the end face 25a of the fuel level sensor 2 The operation of attaching the fuel level sensor 2 to the fuel tank 3 is completed by contacting the portion 32. At this time, the adhesive 4 is completely in contact with both the bottom surface 33 of the fuel tank 3 and the housing 22 of the fuel level sensor 2. Thereby, the air between the ultrasonic oscillator 21 and the fuel in the fuel tank 3 is eliminated, and the ultrasonic emission from the ultrasonic oscillator 21 to the fuel and the reception of the reflected wave from the liquid surface are stabilized, The liquid level detection accuracy by the fuel level sensor 2 can be improved.
[0028]
Next, a fuel level detection operation in the fuel level detection device 1 according to the first embodiment of the present invention will be described with reference to FIG.
[0029]
FIG. 4 shows an electric circuit configuration diagram of the fuel liquid level detecting device 1 according to the first embodiment of the present invention.
[0030]
The fuel level sensor 2, that is, the ultrasonic vibrator 21 is connected to the control circuit 6, which is connected to the display unit 7.
[0031]
The control circuit 6 includes a pulse generation circuit 61 for controlling the application of a voltage to the ultrasonic vibrator 21, an arithmetic circuit 62 for processing the voltage signal from the ultrasonic oscillator 21 and calculating the liquid surface position, and a signal from the arithmetic circuit 62. The driving circuit 63 outputs a driving signal for driving the display unit 7 based on the liquid level detection signal.
[0032]
The display unit 7 includes, for example, a pointer gauge and the like, and displays a liquid level position in the fuel tank 3 so that the driver can recognize it. Generally, the display unit 7 is installed in a combination meter in front of a driver's seat of an automobile (not shown).
[0033]
When the ultrasonic vibrator 21 emits a pulsed ultrasonic wave into the fuel 5 in the fuel tank 3 by a signal from the pulse generation circuit 61, the ultrasonic pulse proceeds as shown by an arrow in FIG. 5 is reflected by the liquid surface 51 and returns to the ultrasonic transducer 21 again. The ultrasonic transducer 21 vibrates by the reflected pulse to generate a voltage signal, and the voltage signal is input to the arithmetic circuit 62. The arithmetic circuit 62 calculates the time from when the pulse generating circuit 61 issues a signal to the ultrasonic transducer 21 to when the reflected wave is detected, and, based on the calculated time, determines the position of the liquid surface 51, that is, the liquid in FIG. The surface height H is calculated. The drive circuit 63 is a signal for displaying the liquid level H calculated by the arithmetic circuit 62 on the display unit 7, for example, to rotate a pointer shaft (not shown) to an angle corresponding to the liquid level H. Output the driving signal.
[0034]
In the fuel level detecting device 1 according to the first embodiment of the present invention described above, the support wall 31 that regulates the movement of the fuel level sensor 2 along the bottom surface 33 is provided on the bottom surface 33 of the fuel tank 3, and the support wall 31 is provided. A hole 32 is provided in the wall 31. On the other hand, the fuel level sensor 2 is provided with a protrusion 25 that engages with the hole 32 to restrict the movement of the fuel level sensor 2 in a direction away from the bottom surface 33. Thus, the fuel level sensor 2 can be securely attached to the fuel tank 3 by a simple operation of pushing the fuel level sensor 2 toward the bottom surface 33 of the fuel tank 3. Therefore, the complicated work of tightening a plurality of screws in the case of the conventional liquid level detecting device for a vehicle is not required, and the workability of attaching the fuel liquid level sensor 2 to the fuel tank 3 can be improved.
[0035]
In the fuel level detecting device 1 according to the first embodiment of the present invention described above, the fuel tank 3 is formed of resin, and the support wall 31 is integrated with the fuel tank 3 when the fuel tank 3 is molded with resin. Is formed. Thereby, the number of parts can be reduced, the cost can be reduced, and the support wall 31 can be easily provided on the fuel tank 3. Further, the positional accuracy between the support wall 31 and the fuel level sensor 2 can be improved.
[0036]
FIG. 5 shows a perspective external view of a modified example of the fuel level detecting device 1 according to the first embodiment of the present invention.
[0037]
In this modified example, the shape of the hole 32 of the support wall 31 provided on the bottom surface 33 of the fuel tank 3 is changed. That is, the hole 32 is changed from a through hole to a blind hole as shown in FIG. 5, and a part of the hole 32 is opened to the end face 34 of the support wall 31. In this case, when attaching the fuel level sensor 2 to the fuel tank 3, first, the protrusion 25 of the fuel level sensor 2 is aligned with the opening of the hole 32, and the fuel level sensor 2 is directed toward the bottom surface 33. 5 (in the direction indicated by the arrow A in FIG. 5) so that the end surface 25 a of the protruding portion 25 abuts on the hole 32. Next, the fuel level sensor 2 is rotated in the direction indicated by the arrow B in FIG. 5, and the fixing of the fuel level sensor 2 to the fuel tank 3 is completed. In this modification, the support wall 31 is not elastically deformed by the protruding portion 25 at the time of mounting the fuel level sensor 2 to the fuel tank 3, so that the force required for mounting the fuel level sensor 2 is reduced. Can be.
[0038]
In the fuel level detecting device 1 according to the first embodiment of the present invention described above and the modification thereof, the number of the support walls 31 is two and therefore the number of the protruding portions 25 is two. Is not limited to two, and may be two or more, for example, three or four. In this case, if the plurality of support walls 31 are arranged on the bottom surface 33 at equal angular intervals in the circumferential direction, the mounting workability of the fuel level sensor 2 can be further improved.
[0039]
Further, in the fuel level detecting device 1 according to the first embodiment of the present invention described above and the modification thereof, the support walls 31 are formed independently of each other, but these may be formed as one continuous support wall. Good. That is, the support wall may be formed in a cylindrical shape, and the plurality of holes 32 may be formed therein.
[0040]
(2nd Embodiment)
FIG. 6 is a sectional view of the fuel level detecting device 1 according to the second embodiment of the present invention, and corresponds to an enlarged sectional view of a portion I in FIG. FIG. 7 is a view on arrow VII in FIG.
[0041]
In the fuel level detecting device 1 according to the second embodiment of the present invention, the shape of the second restricting portion formed on the support wall 31 of the fuel tank 3 is changed, and the third restricting portion engages with the second restricting portion. The fuel level sensor 2 is not provided on the fuel level sensor 2 but provided on a stopper 8 which is a separate component independent of the fuel level sensor 2, and the fuel level sensor 2 is fixed to the fuel tank 3 by the stopper 8.
[0042]
That is, in the fuel level detecting device 1 according to the second embodiment of the present invention, the support wall 31 is formed in a cylindrical shape, and the outer peripheral side of the support wall 31 and coaxial with the support wall 31 serve as a second regulating portion. A portion 35 is provided. On the other hand, as shown in FIGS. 6 and 7, the stopper 8 is formed in a substantially cylindrical shape with a bottom from, for example, a resin material, and has two locking portions 81 as a third regulating portion that engages with the step portion 35. Are provided at 180 degree intervals.
[0043]
As shown in FIG. 6, a spring portion 27 is formed integrally with the case 24 of the liquid level detection sensor 2. When the locking portion 81 of the stopper 8 is engaged with the step portion 35 and the fuel level sensor 2 is fixed to the fuel tank 3, the spring portion 27 is pressed by the stopper 8 and elastically deforms. It acts in the direction of pressing the fuel level sensor 2 against the bottom surface 33. Therefore, the fuel level sensor 2 is securely fixed to the fuel tank 3.
[0044]
Next, a method of attaching the fuel level sensor 2 to the fuel tank 3 in the fuel level detecting device 1 according to the second embodiment of the present invention will be described.
[0045]
First, the substantially circular sheet-like adhesive 4 is set on the bottom surface 33 inside the support wall 31.
[0046]
Next, the fuel level sensor 2 is pressed against the inside of the support wall 31 while being in close contact with the adhesive 4.
[0047]
Next, the stopper 8 is pushed toward the bottom surface 33 so as to cover the opening of the support wall 31 while grasping the knob 82, and the locking portion 81 is engaged with the step portion 35. Thus, the operation of attaching the fuel level sensor 2 to the fuel tank 3 is completed.
[0048]
In the fuel level detecting device 1 according to the second embodiment of the present invention described above, the workability of mounting the fuel level sensor 2 to the fuel tank 3 can be improved as in the case of the first embodiment. .
[0049]
Further, in the fuel level sensor 1 according to the second embodiment, since the fuel level sensor 2 is sealed by the stopper 8 and the support wall 31, water, dust, etc. adhere to the fuel level sensor 2. Can be prevented.
[0050]
In the fuel level detecting device 1 according to the second embodiment of the present invention described above, the number of the locking portions 81 is two. However, the number is not limited to two and may be any number as long as it is two or more. .
[0051]
FIG. 8 is a plan view of a stopper 8 in a modified example of the fuel level detecting device 1 according to the second embodiment of the present invention.
[0052]
In this modification, the shape of the stopper 8 is changed from a cylindrical shape with a bottom to a partially cut-out shape as shown in FIG. In this case, in order to maintain reliable engagement between the stopper 8 and the support wall 31 during operation of the vehicle, it is desirable that the number of the locking portions 81 be three or more.
[0053]
FIG. 9 shows a sectional view of another modification of the fuel level detection device 1 according to the second embodiment of the present invention. FIG. 10 is a view taken in the direction of the arrow X in FIG.
In the other modification, the shape of the stopper 8 is changed and the engagement between the support wall 31 of the fuel tank 3 and the stopper 8 is different from the fuel level detecting device 1 according to the above-described second embodiment of the present invention. The shape of the portion is changed to the same shape as the shape of the engagement portion between the support wall 31 and the fuel level sensor 2 in the fuel level detection device 1 according to the first embodiment of the present invention. That is, three support walls 31 are provided on the bottom surface 33 of the fuel tank 3, and a hole 32 which is a through hole is provided on each support wall 31. On the other hand, the stopper 8 has a shape as shown in FIG. 9, and three protrusions 83 are provided as third restricting portions that engage with the holes 32.
[0054]
In another modification of the fuel liquid level detecting device 1 according to the second embodiment of the present invention, the stopper 8 is pushed toward the bottom surface 33 and the protrusion 83 is engaged with the hole 32 by a simple operation. The work of attaching the surface sensor 2 to the fuel tank 3 is completed. Therefore, the workability of attaching the fuel level sensor 2 to the fuel tank 3 can be improved.
[0055]
In the modification of the second embodiment described above and other modifications, the shapes of the support wall 31 and the hole 32 may be as shown in FIG. Further, three support walls 31 may be connected to form a cylindrical shape.
[0056]
In the other modified examples of the above-described second embodiment, the number of the holes 32 and the number of the protruding portions 83 are each three, but may be three or more.
[0057]
Further, in the fuel level detecting device 1 according to the second embodiment of the present invention described above, its modification and other modifications, the material of the stopper 8 is a resin material, but a material other than the resin, for example, a metal material is used. It may be formed by press molding or the like.
[0058]
Further, in the above-described fuel level detecting device 1 according to the first embodiment of the present invention and its modified example, the fuel level detecting device 1 according to the second embodiment, its modified example, and other modified examples, 2 is attached to the bottom surface 33 of the fuel tank 3, the attachment position is not limited to the bottom surface 33, and may be anywhere on the outer surface of the fuel tank 3.
[0059]
Further, in the fuel level detecting device 1 according to the first embodiment of the present invention described above, the fuel level detecting device 1 according to the second embodiment, and the modifications, the adhesive 4 is formed in a sheet shape. It does not need to be limited, and may be in the form of jelly.
[0060]
Further, in each of the embodiments and the modified examples described above, the case where the vehicle liquid level detecting device of the present invention is applied to the vehicle fuel level detecting device 1 has been described as an example. You may apply other than. For example, it may be used for engine oil level detection, brake fluid level detection, or window washer level detection.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a fuel level detecting device 1 according to a first embodiment of the present invention, and is an enlarged sectional view of a portion I in FIG.
FIG. 2 is an overall external view of a fuel liquid level detecting device 1 according to the first embodiment of the present invention.
FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;
FIG. 4 is an electric circuit configuration diagram of the fuel level detecting device 1 according to the first embodiment of the present invention.
FIG. 5 is an external perspective view of a support wall 31 in a modified example of the fuel level detecting device 1 according to the first embodiment of the present invention.
FIG. 6 is a partial sectional view of a fuel level detecting device 1 according to a second embodiment of the present invention.
7 is a view taken in the direction of the arrow VII in FIG. 6;
FIG. 8 is a plan view of a stopper 8 in a modified example of the fuel level detecting device 1 according to the second embodiment of the present invention.
FIG. 9 is a sectional view of another modified example of the fuel level detecting device 1 according to the second embodiment of the present invention.
10 is a view as viewed in the direction of the arrow X in FIG. 9;
[Explanation of symbols]
1. Fuel level detector (vehicle level detector)
2 Fuel level sensor (ultrasonic detector)
21 Ultrasonic vibrator 22 Housing 23 Anti-vibration member 24 Case 25 Projecting part (third regulating part)
25a End face 26 Lead wire 27 Spring part 3 Fuel tank (tank)
31 Support wall (first regulation part)
32 holes (second regulating part)
33 bottom (outer surface)
34 End surface 35 Step 4 Adhesive 5 Fuel 51 Liquid level 6 Control circuit 61 Pulse generation circuit 62 Operation circuit 63 Drive circuit 7 Display section 8 Stopper 81 Lock section (third regulating section)
82 Knob 83 Protruding part (third regulating part)
H Liquid level height

Claims (6)

A tank for storing liquid,
An ultrasonic detector built-in and equipped with an ultrasonic detector attached to the outer surface of the tank,
In a vehicle liquid level detection device that measures the liquid level by emitting ultrasonic waves from the ultrasonic transducer to the liquid in the tank,
A first regulating portion provided on the outer surface of the tank to regulate movement of the ultrasonic detector along the outer surface;
A second regulating unit provided on the regulating member, for regulating movement of the ultrasonic detector in a direction away from the outer surface,
A third regulating portion that engages with the second regulating portion and regulates movement of the ultrasonic detector in a direction away from the outer surface,
The liquid level detecting device for a vehicle, wherein the third regulating portion is formed integrally with the ultrasonic detector. The liquid level detecting device for a vehicle, wherein the third regulating portion is formed on a stopper which is a separate component independent of the ultrasonic detector. The liquid level detecting device for a vehicle according to claim 1, wherein the tank is made of a resin material, and the first regulating portion is formed integrally with the tank. 4. The ultrasonic detector according to claim 1, wherein the ultrasonic detector is attached to the tank by pressing the ultrasonic detector or the stopper in a direction toward the outer surface of the tank. The liquid level detecting device for a vehicle according to any one of the preceding claims. The ultrasonic detector is attached to the tank by rotating the ultrasonic detector or the stopper along the outer surface while pressing the stopper in a direction toward the outer surface of the tank. The vehicle liquid level detecting device according to any one of claims 1 to 3. The vehicle liquid level detecting device according to any one of claims 1 to 5, wherein the ultrasonic detector is attached to a bottom surface or a side surface of the tank.

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