JP6156239B2 - Liquid level detector - Google Patents

Description

  The present invention relates to a liquid level detection device that detects a liquid level of a liquid stored in a container.

  Conventionally, a liquid level detection device that detects a liquid level of a liquid stored in a container is known. In the liquid level detection device disclosed in Patent Document 1, a rotating body that rotates according to the vertical movement of the liquid level by a fixed body fixed to the container and a float that is held by the fixed body and floats on the liquid level And an arm connecting the rotating body and the float. The diameter of the insertion hole of the rotating body is formed to be the same as or slightly smaller than the diameter of the arm. That is, the size of both is such that the arm can be easily inserted into the insertion hole by hand when the arm is mounted on the rotating body in the mounting process of the liquid level detection device.

JP 2005-10093 A

  However, in the case where the diameter of the insertion hole is formed to be the same as or slightly smaller than the diameter of the arm, the arm must be inserted in an accurate position with respect to the insertion hole in the mounting process. Had been worsening.

  Therefore, the present inventor has studied a configuration in which the diameter of the insertion hole is increased in order to improve the working efficiency. However, in this configuration, as the result of the rattling of the arm, the position of the float is displaced with respect to the rotating body, which may cause an error in the liquid level detection accuracy.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid level detection device that improves the detection accuracy of the liquid level.

  The present invention is a liquid level detection device for detecting a liquid level (LL) of a liquid stored in a container (1), and a fixed body (10) fixed to the container and a float ( 20), a rotating body (30) supported by a fixed body and rotating by a float according to the vertical movement of the liquid level, and an arm (50) that connects the rotating body and the float and is elastically deformable. The rotating body has an insertion hole (35a-c, 235) into which the arm is inserted from the inlet portion (36, 236) and a locking structure (41) for locking the arm. A locking portion (52) locked by the structure and extending along a predetermined extending direction (DE), and an insertion portion (54) bent with respect to the locking portion and inserted into the insertion hole, The insertion portion is supported by the inlet portion of the insertion hole from the bending side with respect to the locking portion ( 4b), an elastic restoring force is exerted on the insertion hole on the side opposite to the bending side out of the portions separated from the supporting portion from the engaging portion, and the engaging portion is separated from the supporting portion from the supporting portion. Of these, an elastic restoring force is exerted on the locking structure on the side opposite to the insertion portion.

  According to such an invention, the insertion portion is inserted into the insertion hole, and the arm whose locking portion is locked by the locking structure has the locking portion at the support portion where the insertion portion is locked by the inlet portion of the insertion hole. Supported from the bending side with respect to the side. Then, the arm exerts an elastic restoring force on the insertion hole on the side opposite to the bending side among the portions separated from the supporting portion from the locking portion, and the bending side among the portions separated from the supporting portion from the inserting portion. By applying an elastic restoring force to the locking structure on the opposite side, the rotating body and the float are connected. According to this, rattling with respect to the insertion hole of the arm can be suppressed by these elastic restoring forces. And the liquid level detection apparatus which raises the detection precision of a liquid level can be provided because the position shift of the float with respect to a rotary body is suppressed.

  In addition, the code | symbol in a parenthesis is only what exemplifies the structure corresponding to embodiment mentioned later, in order to make an understanding of description content easy, and does not limit the content of invention.

It is a front view which shows the installation state to the fuel tank of the liquid level detection apparatus in 1st Embodiment. It is a front view which shows the rotary body and arm in 1st Embodiment. It is the III-III sectional view taken on the line of FIG. FIG. 4 is a partially enlarged view schematically showing an insertion hole, an insertion portion, and the like in FIG. 3. It is a front partial enlarged view which shows typically the entrance part and arm of an insertion hole in a 1st embodiment. It is sectional drawing which shows the latching structure in the VI-VI line of FIG. It is sectional drawing which shows the latching structure in the VII-VII line of FIG. It is a front view which shows the mounting method to the rotary body of the arm in 1st Embodiment. It is a figure which shows the mounting method to the rotary body of the arm in 1st Embodiment, Comprising: It is a figure corresponding to FIG. It is the elements on larger scale corresponding to FIG. 4 in 2nd Embodiment. FIG. 6 is a partially enlarged front view schematically showing an inlet portion and an arm of an insertion hole in the second embodiment, corresponding to FIG. 5. It is a back surface partial enlarged view which shows typically the exit and arm of an insertion hole in a 2nd embodiment. FIG. 6 is a partially enlarged view corresponding to FIG.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
As shown in FIG. 1, the liquid level detection device 100 according to the first embodiment of the present invention is installed in a fuel tank 1 as a container for storing fuel as liquid. The liquid level detection device 100 detects the fuel liquid level LL while being held in the fuel pump module 2 or the like. The liquid level detection apparatus 100 includes a fixed body 10, a float 20, a rotating body 30, and an arm 50.

  The fixed body 10 includes a main body 12, a Hall IC 14, a terminal 16, and the like. The main body 12 of the fixed body 10 is formed of a resin material such as polyphenylene sulfide (PPS) resin, for example, and is fixed to the fuel tank 1 via the fuel pump module 2. Although not shown, the main body 12 is provided with an element storage chamber for storing the Hall IC 14, a shaft portion for rotatably supporting the rotating body, and the like. The Hall IC 14 is a detection element that detects the rotation angle of the rotating body 30 with respect to the fixed body 10. The Hall IC 14 receives a magnetic field action from the magnet of the rotating body 30 to generate a voltage corresponding to (for example, proportional to) the magnetic flux density passing through the Hall IC in a predetermined detection direction. The three terminals 16 are formed in a band plate shape by a conductive material such as phosphor bronze. Each terminal 16 is used to transmit a detection signal between an external device (for example, a combination meter) (not shown) and the Hall IC 14. Thus, the voltage generated in the Hall IC 14 is measured by an external device as a signal indicating the detection result via each terminal.

  The float 20 is formed of a material having a specific gravity smaller than that of the fuel, such as foamed ebonite, and floats on the liquid level of the fuel. The float 20 is held by the rotating body 30 via the arm 50.

  The rotating body 30 is a magnet holder having a main body rotating portion 34, a pair of magnets 32, and the like. The main body rotating part 34 is formed in a disk shape from a resin material such as PPS resin. The main body rotation part 34 is rotatably supported with respect to the fixed body 10 by being externally fitted to the shaft part. The pair of magnets 32 are arranged at two locations facing each other across the shaft portion in which the Hall IC 14 is accommodated. The pair of magnets 32 generate a magnetic flux that passes through the Hall IC, and the rotating body 30 is rotated by the float 20 according to the vertical movement of the liquid level LL.

  As shown in FIG. 2, the main body rotating portion 34 of the rotating body 30 includes insertion holes 35 a to 35 c into which the arm 50 is inserted, and a locking structure 41 that locks the arm 50.

  The arm 50 is formed in a round bar shape by an elastically deformable metal material such as a steel wire, and connects the rotating body 30 and the float 20. Specifically, one end of the arm 50 is inserted through a through hole 22 formed in the float 20. The other end of the arm 50 is attached to the rotating body 30. Specifically, the arm 50 is locked by the locking structure 41 and is bent toward the bending side with respect to the locking portion 52 extending along the predetermined extending direction DE and the locking portion 52, and the insertion holes 35a to 35a. It has the insertion part 54 inserted in c.

  Here, the relationship between the rotating body 30 and the arm 50 attached to the rotating body 30 will be described in detail with reference to FIGS.

  The insertion holes 35a to 35c are opened through the hole axis HA substantially perpendicular to the extending direction DE. In particular, in the present embodiment, three insertion holes 35a to 35c are provided side by side along the extending direction DE. The insertion portion 54 of the arm 50 is inserted into any one of the three insertion holes 35a to 35c. In the drawing, an insertion portion 54 is inserted into the second insertion hole 35b from the outer peripheral side of the rotating body. In this embodiment, since each insertion hole 35a-c is substantially the same shape, the insertion hole 35b in which the insertion part 54 is inserted in a figure is demonstrated typically.

  As shown in FIGS. 3 and 4, the insertion hole 35 b includes an inlet portion 36 that is an insertion port of the insertion portion 54, and an outlet portion 37 from which the distal end 54 a of the insertion portion 54 protrudes through the insertion portion 54. Forming. The insertion hole 35b forms a pair of first inner surface portions 38a to 38b and a pair of second inner surface portions 38c to 38d as inner surfaces. As shown in FIGS. 3 to 5, the pair of first inner surface portions 38 a to 38 b are opposed to each other in the extending direction DE, and each has a cross-sectional circle having a radius of curvature RI larger than the radius of curvature RA of the insertion portion 54 of the arm 50. It is formed in an arcuate arc surface shape. On the other hand, the pair of second inner surface portions 38c-d connecting the pair of first inner surface portions 38a-b are opposed to each other in the width direction DW substantially perpendicular to the extending direction DE, and have a planar shape with a straight cross section. Is formed.

  Due to the shape of the first inner surface portions 38a-b and the second inner surface portions 38c-d, the size SE in the extending direction DE in the insertion hole 35b from the inlet portion 36 to the outlet portion 37 is substantially perpendicular to the extending direction DE. The size is larger than the size SW in the width direction DW. Here, the size SE in the extending direction DE in the present embodiment is the dimension between the most concave portions in the pair of first inner surface portions 38a to 38b of the insertion hole 35b, and the size SW in the width direction DW. Is a dimension between the pair of second inner surface portions 38c to 38d of the insertion hole 35b. In the first embodiment having substantially no gradient of the insertion hole 35b, the size SE1 in the extending direction DE of the insertion hole 35b in the inlet portion 36 is substantially the same as the size SE2 in the extending direction DE of the insertion hole 35b in the outlet portion 37. Is formed. The size SW1 in the width direction DW at the inlet portion 36 is also formed substantially the same as the size SW2 in the width direction DW at the outlet portion 37. Further, the curvature radius RI in the first inner surface portions 38a and 38b is also formed substantially the same in the inlet portion and the outlet portion.

  Moreover, the periphery of 1st inner surface part 38a-b is chamfered among the entrance parts 36 of the insertion hole 35b. Specifically, the chamfered portions 39a and 39b are inclined toward the outlet side toward the inner peripheral side of the insertion hole.

  The locking structure 41 formed integrally with the rotating main body is composed of two clamps 41a to 41b having the same diameter, one small diameter clamp 41c, and a locking stopper 41d, which are arranged side by side in the extending direction DE. ing. As shown in FIGS. 2, 3, and 6, each of the two same diameter clamps 41 a to 41 b arranged closest to the insertion hole 35 b has a diameter DC <b> 1 that is approximately the same as the diameter DA of the locking portion 52 of the arm 50. The locking portion is locked from the side opposite to the bending side and the side opposite to the receiving side. As shown in FIGS. 2, 3, and 7, the small-diameter clamp 41 c is formed so that its diameter DC2 is slightly smaller than the diameter DA of the locking portion 52 of the arm 50, and is in an elastically deformed state. The said latching | locking part is latched from the opposite side to a receiving side. Here, the receiving side is the side where the same-diameter clamps 41 a to 41 b and the small-diameter clamp 41 c are released in the locking structure 41. In FIG. 7, the small-diameter clamp 41c in an inelastically deformed state is shown, and the locking portion 52 is shown by a broken line. As shown in FIGS. 2 and 3, the locking stopper 41 d locks from the receiving side that the locking portion 52 rotates and comes off the clamps 41 a to 41 c. Since a plurality of the clamps 41a to 41c are provided, even when the main body rotation unit 34 is distorted during use of the liquid level detection device 100, the mounted state is reliably maintained.

  The locking part 52 extends along the surface of the main body rotating part 34 by being locked to the locking structure 41.

  The insertion portion 54 is bent with respect to the locking portion 52 and is inserted into the insertion hole 35b from the inlet portion 36. More specifically, the bent portion 56 between the locking portion 52 and the insertion portion 54 is curved because it is formed by processing using a bending die. The insertion portion 54 is bent at an obtuse angle with respect to the locking portion 52. This obtuse angle AA takes into account the depth of the insertion hole 35b and the like, and the gap that is maximum due to the tolerance of the size SE of the insertion hole 35b in the extending direction DE and the diameter DA of the insertion portion 54 of the arm 50 is made zero. Set to an angle. In particular, the angle AA of the present embodiment is set to a predetermined value that is larger than 90 ° and smaller than or equal to 91 °, for example.

  The distal end 54 a of the insertion portion 54 protrudes from the outlet portion 37 and abuts against the restriction portion 18 of the fixed body 10, thereby restricting the rotation angle of the rotating body 30. Here, the restricting portions 18 that are in contact with each other by the three insertion holes 35a to 35c are formed so as to be different from each other, and the tip 54a of the insertion portion 54 is inserted into the insertion hole 35a on the outer peripheral side of the rotating body 30. The deflection angle of the rotating body 30 is small. Here, the deflection angle is an angle corresponding to between the restricting portions 18 on both sides corresponding to the distal end 54 a of the insertion portion 54. That is, the insertion holes 35a to 35c for inserting the arm 50 are selected in accordance with the shape of the fuel tank 1 to be installed.

  As a method for manufacturing such a liquid level detection device, a process of mounting the arm 50 on the rotating body 30 will be described below with reference to FIGS.

  First, as an insertion process, the insertion part 54 of the arm 50 is inserted from the inlet part 36 of the insertion hole 35b. Specifically, as shown in FIGS. 8 and 9, the insertion portion 54 is inserted into the hole axis HA of the insertion hole 35 b in a state where the extending direction DE of the locking portion 52 is shifted to the receiving side with respect to the locking structure 41. Insert along. Due to the size SW in the width direction DW larger than the diameter DA of the insertion portion 54 of the arm 50, the size SE in the further extending direction DE, and the chamfered portions 39a to 39b, the insertion hole 35b is displaced from the position of the tip 54a during insertion. It is forgiving. Then, the locking part 52 after insertion is in a state of floating with respect to the main body rotating part 34 and the locking structure 41 by the insertion part 54 bent at an obtuse angle with respect to the locking part 52.

  Next, as a locking step, the locking portion 52 of the arm 50 is locked to the locking structure 41. Specifically, as shown by an arrow in FIG. 9, an arrow is shown in FIG. 8 in a state where the locking portion 52 of the arm 50 is pressed so as to follow the surface of the main body rotating portion 34 and the locking structure 41. As described above, the locking portion 52 is rotated toward the locking structure 41 around the insertion portion 54 inserted into the insertion hole 35b. As a result, the locking portion 52 of the arm 50 is received by the locking structure 41 from the receiving side, and as a result, is locked by the locking structure 41. Specifically, the locking part 52 starts locking to the two same-diameter clamps 41a to 41b arranged on the insertion hole 35b side, and is then pushed into the small-diameter clamp 41c, so that the same-diameter clamps 41a to 41b are inserted. b, the small diameter clamp 41c, and the locking stopper 41d are locked from four directions substantially perpendicular to the extending direction DE.

  The insertion portion 54 along the hole axis HA of the insertion hole 35b in the insertion step is inclined at an angle with respect to the hole axis HA of the insertion hole 35b by the pressing of the locking portion 52 in the locking step. . As a result, as shown in FIG. 4 in an enlarged manner, the insertion portion 54 forms a support location 54b that is supported from the bending side with respect to the locking portion 52 by the inlet portion 36 of the insertion hole 35b. Further, the insertion portion 54 exerts an elastic restoring force on the insertion hole 35b on the side opposite to the bending side among the portions separated from the support portion 54b from the locking portion 52. In this way, the insertion portion 54 forms the support portion 54b at the first inner surface portion 38b on the bending side of the inlet portion 36 of the insertion hole 35b, and the bending side of the outlet portion 37 of the insertion hole 35b. Are in elastic contact at the contact location 54c on the first inner surface 38a on the opposite side.

  On the other hand, the locking part 52 exerts an elastic restoring force on the locking structure 41 on the side opposite to the insertion part 54 among the places away from the insertion part 54 than the support part 54b. In this way, specifically, the locking portion 52 exerts an elastic restoring force on the side opposite to the surface of the main body rotating portion 34 with respect to the clamps 41 a to 41 c of the locking structure 41.

  As described above, the case where it is inserted into the insertion hole 35b has been described representatively, but the same applies to the case where it is inserted into the insertion hole 35a or 35c.

(Function and effect)
The operational effects of the first embodiment described above will be described below.

  According to the first embodiment, the insertion portion 54 is inserted into the insertion holes 35a to 35c, and the arm 50 in which the locking portion 52 is locked by the locking structure 41 has the insertion portion 54 at the support location 54b. It supports from the bending side with respect to the latching | locking part 52 by the entrance part 36 of insertion hole 35a-c. The arm 50 exerts an elastic restoring force on the insertion holes 35a to 35c on the side opposite to the bending side among the portions separated from the support portion 54b from the locking portion 52, and is separated from the support portion 54b from the insertion portion 54. The rotating body 30 and the float 20 are connected by exerting an elastic restoring force on the locking structure 41 on the side opposite to the bending side. According to this, rattling with respect to the insertion holes 35a to 35c of the arm 50 can be suppressed by these elastic restoring forces. And the liquid level detection apparatus 100 which raises the detection precision of the liquid level LL can be provided by the position shift of the float 20 with respect to the rotary body 30 being suppressed.

  Further, according to the first embodiment, the engaging portion 52 is bent at an obtuse angle. According to this, in the mounting step, after the insertion portion 54 of the arm 50 is inserted into the insertion holes 35 a to c with the locking portion 52 of the arm 50 floating, the locking portion 52 is engaged with the locking structure 41. By stopping, the insertion portion 54 is at an angle with respect to the hole axis HA of the insertion holes 35a to 35c. Therefore, the supporting portion 54b can be formed in the inlet portion 36 and an elastic restoring force can be exerted on the insertion holes 35a to 35c and the locking structure 41 with a simple mounting operation.

  Further, according to the first embodiment, in the insertion holes 35a to 35c, the size SE in the stretching direction DE is larger than the size SW in the width direction DW perpendicular to the stretching direction DE. Therefore, even if there is a gap in the extending direction DE between the insertion portion 54 and the insertion holes 35a to 35c, the support portion 54b is formed in the inlet portion 36 and an elastic restoring force is exerted on the insertion holes 35a to 35c. Further, rattling of the extending direction DE of the arm 50 with respect to the insertion holes 35a to 35c is suppressed. Therefore, in the mounting process, even if the position of the insertion portion 54 of the arm 50 with respect to the insertion holes 35a to 35c is shifted in the extending direction DE, the insertion portion 54 is easily inserted into the insertion holes 35a to 35c. Shaking of the arm 50 can be suppressed.

  According to the first embodiment, the first inner surface portions 38a to 38b in the extending direction DE of the insertion holes 35a to 35c are formed in an arc shape having a curvature radius RI larger than the curvature radius RA of the arm 50. According to this, since the reaction force received by the insertion portion 54 at the support portion 54b and the portion where the elastic restoring force is exerted is in the direction toward the center of curvature, rattling of the width direction DW of the arm 50 with respect to the insertion holes 35a to 35c. Can be suppressed.

  Further, according to the first embodiment, at least the first inner surface portion 38b on the bending side in the extending direction DE is chamfered among the inlet portions 36 of the insertion holes 35a to 35c. According to this, even if the other side of the arm 50 is displaced to the chamfered portion 39b in the mounting step, it can be easily inserted, and damage to the inlet portion 36 that supports the support portion 54b can be prevented.

(Second Embodiment)
As shown in FIGS. 10-12, 2nd Embodiment of this invention is a modification of 1st Embodiment.

  Similarly to the first embodiment, the insertion hole 235 in the liquid level detection device 200 of the second embodiment is inserted into the insertion portion 54 by passing through the inlet portion 236 that is the insertion port of the insertion portion 54 and the insertion portion 54. An outlet portion 237 from which the tip 54a of the projection protrudes is formed. Here, in 2nd Embodiment, the insertion hole 235 has the inclination which becomes narrow, so that the inlet_port | entrance part 236 is wide and it leaves | separates. More specifically, the bending side of the insertion hole 235 is inclined to the side opposite to the bending side with respect to the hole axis HA as it goes from the inlet portion 236 to the outlet portion 237. On the other hand, the side opposite to the bending side in the insertion hole 235 is inclined toward the bending side with respect to the hole axis HA as it goes from the inlet portion 236 to the outlet portion 237.

  Due to such a gradient, the second inner surface portions 238c to 238d of the inlet portion 236 shown in FIG. 11 are formed longer in the extending direction DE than the second inner surface portions 238c to 238d of the outlet portion 237 shown in FIG. Therefore, the size SE1 in the extending direction DE of the insertion hole 235 in the inlet 236 is formed larger than the size SE2 in the extending direction DE of the insertion hole 235 in the outlet 237. The size SW1 in the width direction DW at the inlet portion 236 is formed substantially the same as the size SW2 in the width direction DW of the insertion hole 235 in the outlet portion 237. Further, the radius of curvature RI of the first inner surface portions 238a and 238b is formed substantially the same in the inlet portion 236 and the outlet portion 237. In the present embodiment, this gradient is also used as a draft in the molding of the main body rotation unit 34.

  Also in the second embodiment described above, the insertion portion 54 has the support portion 54b supported from the bending side with respect to the locking portion 52 by the inlet portion 236 of the insertion hole 235, and from the locking portion 52 to the support portion 54b. Further, an elastic restoring force is exerted on the insertion hole 235 on the side opposite to the bending side among the spaced apart portions, and the locking portion 52 is on the opposite side to the insertion portion 54 among the portions separated from the supporting portion 54b from the insertion portion 54. The elastic restoring force is exerted on the locking structure 41 in FIG. Therefore, it is possible to achieve the operational effects according to the first embodiment.

  In addition, according to the second embodiment, the insertion hole 235 has a slope that becomes narrower as the inlet portion 236 is wider and separated. According to this, since the entrance part 236 becomes wide, it becomes easy to insert even if the arm 50 is displaced in the mounting process.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  Specifically, as a first modification regarding the first embodiment, the insertion holes 35a to 35c may have a slope that becomes wider as the inlet portion 36 is narrower and separated. In this example shown in FIG. 13, the bending side of the insertion holes 35 a to 35 c is inclined toward the bending side with respect to the hole axis HA as it goes from the inlet portion 36 to the outlet portion 37. On the other hand, the side opposite to the bending side in the insertion holes 35a to 35c is inclined to the opposite side to the bending side with respect to the hole axis HA as it goes from the inlet portion 36 to the outlet portion 37.

  As modification 2 regarding the 1st-2nd embodiment, insertion holes 35a-c are formed in the bottom and do not need to penetrate.

  As a third modification regarding the first to second embodiments, the insertion portion 54 may be bent at a right angle or an acute angle with respect to the locking portion 52.

  As a fourth modification regarding the first to second embodiments, in the insertion holes 35a to 35c, the size SE in the stretching direction DE may be formed to be equal to or smaller than the size SW in the width direction DW substantially perpendicular to the stretching direction DE. .

  As a fifth modified example related to the first to second embodiments, the first inner surface portions 38 a to 38 b in the extending direction DE of the insertion holes 35 a to 35 c are other than an arc shape having a curvature radius RI larger than the curvature radius RA of the arm 50. It may be formed.

  As a sixth modified example related to the first to second embodiments, the periphery of the first inner surface portions 38a-b and the second inner surface portions 38c-d is not chamfered in the inlet portion 36 of the insertion holes 35a-c. Good (see FIG. 13). Or although not illustrated, only the periphery of the 1st inner surface part 38b by the side of a bending may be chamfered among the entrance parts 36 of insertion hole 35a-c. Further, the entire periphery may be chamfered at the inlet portion 36 of the insertion holes 35a to 35c.

  As a seventh modified example related to the first to second embodiments, the present invention is applied to a liquid level detecting device in a container such as other fluids mounted on a vehicle, such as brake fluid, engine cooling water, engine oil, and the like. Also good. Furthermore, the present invention is applicable not only to vehicles but also to liquid level detection devices provided in liquid containers provided in various consumer devices and various transport devices.

  100,200 Liquid level detection device, 1 Fuel tank (container), 10 Fixed body, 20 Float, 30 Rotating body, 35a to c, 235 Insertion hole, 36, 236 Inlet part, 38a to b, 238a to b First inner surface Part (inner surface part), 41 locking structure, 50 arm, 52 locking part, 54 insertion part, 54b support location, DE stretching direction, DW width direction, LL liquid level, RA, RI curvature radius, SE, SE1, SE2, SW, SW1, SW2 Size

Claims (7)

A liquid level detection device for detecting a liquid level (LL) of a liquid stored in a container (1),
A fixed body (10) fixed to the container;
A float (20) floating in the liquid;
A rotating body (30) supported by the fixed body and rotated by the float according to the vertical movement of the liquid level;
An arm (50) that connects the rotating body and the float and is elastically deformable;
The rotating body includes insertion holes (35a to c, 235) into which the arm is inserted from the inlet portion (36, 236), and a locking structure (41) for locking the arm.
The arm is locked by the locking structure, is bent with respect to the locking portion (52) extending along a predetermined extending direction (DE), and is inserted into the insertion hole. Having an insertion part (54),
The insertion portion has a support portion (54b) supported from the bending side with respect to the locking portion by the inlet portion of the insertion hole, and the bending portion among the portions spaced from the locking portion from the locking portion. Exerts an elastic restoring force on the insertion hole on the side opposite to the side,
The liquid level detection device according to claim 1, wherein the locking portion exerts an elastic restoring force on the locking structure on a side away from the insertion portion from the support portion on a side opposite to the insertion portion.   The liquid level detection device according to claim 1, wherein the insertion portion is bent at an obtuse angle with respect to the locking portion. 3. The liquid level detection device according to claim 1, wherein the insertion hole (235) has a gradient in which the inlet portion (236) is wide and becomes narrower as it is separated. 4. The liquid level detection device according to claim 1, wherein the insertion hole is formed along a hole axis (HA) perpendicular to the extending direction. 5. In the insertion hole, the size of the stretching direction (SE, SE1, SE2) is claim 4, wherein greater than the size in the stretching direction perpendicular to the width direction (DW) (SW, SW1, SW2) The liquid level detection apparatus described in 1. Inner surface portions (38a-b, 238a-b) of the insertion hole in the extending direction are formed in an arc shape having a curvature radius (RI) larger than the curvature radius (RA) of the arm. The liquid level detection device according to claim 4 or 5 . The insertion hole (35a~c, 235) of said inlet portion of said bending side of the inner surface of at least the stretching direction (38b, 238b) from claim 4, characterized in that it is chamfered 6 The liquid level detection apparatus of any one of Claims.

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