CN110678720B - Liquid level detection device - Google Patents
Liquid level detection device Download PDFInfo
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- CN110678720B CN110678720B CN201880035039.3A CN201880035039A CN110678720B CN 110678720 B CN110678720 B CN 110678720B CN 201880035039 A CN201880035039 A CN 201880035039A CN 110678720 B CN110678720 B CN 110678720B
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- hole
- swing
- rotation shaft
- sensor body
- liquid level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
- G01F23/36—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using electrically actuated indicating means
Abstract
Provided is a liquid level detection device which suppresses the wobbling of an arm held by a resin sensor body. A liquid level detection device (10) is provided with: a resin-made sensor body (50) for holding the arm (30), and a metal-made reinforcing member (60) for reinforcing the sensor body (50). A metal reinforcing member (60) is formed in a substantially U-shape so as to sandwich the sensor body (50), and the reinforcing member (60) includes: a 1 st surface (61) facing the sensor body (50); a 2 nd surface part (62), wherein the 2 nd surface part (62) is opposite to the 1 st surface part (61) and clamps the sensor body. The rotation shaft (31) of the arm (30) penetrates all of a 1 st through hole (56) formed in the sensor body (50), a 2 nd through hole (68) formed in the 1 st surface part (61), and a 3 rd through hole (69) formed in the 2 nd surface part (62).
Description
Technical Field
The present invention relates to a float-type liquid level detection device.
Background
The residual amount of the liquid fuel filled in the fuel tank can be recognized by a fuel gauge provided in the vehicle. The fuel gauge detects the height of the liquid level of the liquid fuel, and displays the remaining amount of the liquid fuel based on it. Among devices for detecting the height of a liquid surface are those of the type that utilize a float that floats on the liquid surface. A conventional technique of a float-type liquid level detection device includes a technique disclosed in patent document 1.
The liquid level detection device disclosed in patent document 1 includes: a sensor body; an arm portion provided on the sensor body in a swingable manner; a holder attached to the arm portion, the holder fixing the arm portion so that the arm portion does not fall off the sensor body; and a float attached to the tip of the arm and floating on the liquid surface.
If the liquid level decreases, the float is displaced downward and the arm portion to which the float is attached swings. If the arm portion swings, the holder is also swung together with the arm portion. At this time, the circuit substrate provided on the holder slides with respect to the contacts provided on the sensor body. That is, the position at which the contact point contacts the circuit substrate changes according to the height of the liquid surface. The liquid level height is detected by outputting a signal corresponding to the position of contact.
Documents of the prior art
Patent document
Patent document 1: JP 2014-139516 publication
Disclosure of Invention
Problems to be solved by the invention
The rotation shaft of the arm portion penetrates through a through hole formed in the sensor body. Generally, the sensor body is formed of resin, and the arm portion is formed of metal. For example, in a liquid level detection device mounted in a large-capacity fuel tank of a construction machine or the like, the arm portion is set long. If the arm portion is long, a large frictional force is generated between the rotation shaft portion and the through hole. Thus, if the arm portion repeatedly swings, there is a risk that the through hole is worn. If the diameter of the through hole is increased by the wear, a gap is formed between the rotation shaft and the inner peripheral surface of the through hole, and the arm portion is shaken. If the arm portion is swung, the circuit board on the holder provided on the arm portion is also swung, and there is a risk that the circuit board and the contact point may not be reliably brought into contact. As a result, the height of the liquid surface may not be detected accurately.
It is desirable to have a liquid level detection device that suppresses the wobbling of the arm portion even when the sensor body is made of resin.
The invention provides a liquid level detection device which can restrain the swing of an arm part held by a sensor body made of resin.
Means for solving the problems
The invention recited in claim 1 relates to a liquid level detection device including: a base; a sensing unit supported on the base; an arm portion provided on the sensor unit in a swingable manner; a float attached to a tip of the arm portion and floating on a liquid surface;
the arm portion includes a rotation shaft portion penetrating the sensor unit and a swinging portion extending from one end portion of the rotation shaft portion;
a liquid level detecting device for outputting a signal corresponding to a height of the float;
the method is characterized in that:
the sensing unit includes: a sensor body made of resin, the sensor body holding the arm portion; a reinforcing member made of metal, the reinforcing member reinforcing the sensor body;
the metal reinforcing member is formed in a substantially U-shape so as to sandwich the sensor body, and includes: a 1 st face, the 1 st face facing the sensor body; the 2 nd face, the 2 nd face is faced with the 1 st face, grasp the body of the sensor;
the rotating shaft portion penetrates: the sensor body includes a 1 st through hole formed in the sensor body, a 2 nd through hole formed in the 1 st surface portion, and a 3 rd through hole formed in the 2 nd surface portion.
Preferably, as defined in claim 2, said 1 st through 3 rd through holes are located on the same axis;
the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are equal to the diameter of the 1 st through hole.
Preferably, as defined in claim 3, said 1 st through 3 rd through holes are located on the same axis;
the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are larger than the diameter of the 1 st through hole.
As set forth in claim 4, preferably, the other end of the rotating shaft portion is substantially flat plate-shaped;
the other end of the rotation shaft portion has a dimension in the longitudinal direction larger than the diameter of the rotation shaft portion and the longitudinal direction of the other end coincides with the direction in which the swing portion extends, with reference to a state viewed from the axial direction of the rotation shaft portion.
Preferably, as defined in claim 5, the swing portion has a substantially crank shape with a portion thereof bent, and the swing portion includes a 1 st swing portion extending from the one end of the rotation shaft portion, a 2 nd swing portion extending from a tip of the 1 st swing portion, and a 3 rd swing portion extending from a tip of the 2 nd swing portion;
a tip of the 2 nd swing portion is positioned on the reinforcing member side with respect to a tip of the 1 st swing portion;
the reinforcing member includes a restricting portion that restricts a swing range of the arm portion by contact of the arm portion;
the restricting portion extends toward the swing track of the 3 rd swing portion.
Preferably, according to claim 6, a tip end of the restricting portion is curved on the side of the swing range.
Preferably, as defined in claim 7, the base includes a cylindrical portion through which the rotation shaft portion can pass.
ADVANTAGEOUS EFFECTS OF INVENTION
In the invention according to claim 1, the sensor unit includes a metal reinforcing member that is a resin-made sensor body. The metal reinforcing member is substantially U-shaped so as to sandwich the sensor body, and includes: a 1 st face, the 1 st face facing the sensor body; the 2 nd face, the 2 nd face is faced with this 1 st face, centre gripping sensor body. The rotation shaft of the arm portion penetrates all of the 1 st through hole formed in the sensor body, the 2 nd through hole formed in the 1 st surface portion, and the 3 rd through hole formed in the 2 nd surface portion.
That is, the 1 st through hole made of resin is sandwiched between the 2 nd through hole and the 3 rd through hole made of metal. Thus, the rotation shaft portion can be supported not only by the 1 st through hole but also by the 2 nd through hole and the 3 rd through hole. The load acting on the 1 st through hole can be reduced, and the 1 st through hole is difficult to expand due to abrasion. This suppresses the arm from wobbling. As a result, a signal corresponding to the height of the float is surely output, and the liquid level can be accurately detected.
In the invention recited in claim 2, the 1 st through hole to the 3 rd through hole are located on the same axis, and the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are equal to the diameter of the 1 st through hole. Thereby, the rotation shaft portions of the arm portions are simultaneously supported by the 1 st through hole to the 3 rd through hole. As a result, the arm can be further suppressed from wobbling.
In the invention according to claim 3, the 1 st through 3 rd through holes are located on the same axis, and the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are larger than the diameter of the 1 st through hole. Thus, even when the 1 st through hole is worn and the hole is enlarged, the rotation shaft portion is in contact with the 2 nd through hole and the 3 rd through hole. As a result, the 1 st penetration can be prevented from becoming larger, and the swing of the arm portion can be made to fall within a predetermined range. Further, by making the sizes of the respective holes different, the rotation shaft portion can be easily penetrated, and the assembly can be easily performed.
In the invention according to claim 4, the other end portion of the rotating shaft portion is substantially flat plate-shaped, and the dimension in the longitudinal direction of the other end portion of the rotating shaft portion is larger than the diameter of the rotating shaft portion with reference to a state viewed from the axial direction of the rotating shaft portion, and the longitudinal direction of the other end portion coincides with the direction in which the swinging portion extends. Thus, when the arm portion is to be swung in the lateral direction, that is, when the swing portion is vibrated in a direction in which the swing portion is separated from or approaches the sensor unit with the one end portion of the rotation shaft portion as a base point, the other end portion of the rotation shaft portion is brought into contact with the reinforcing member, and the lateral vibration of the arm portion can be suppressed.
In the invention according to claim 5, the swing portion has a substantially crank shape with a portion thereof bent, and the swing portion includes a 1 st swing portion extending from one end of the rotation shaft portion, a 2 nd swing portion extending from a tip of the 1 st swing portion, and a 3 rd swing portion extending from a tip of the 2 nd swing portion, and the tip of the 2 nd swing portion is located on the reinforcing member side with respect to the tip of the 1 st swing portion. In addition, the reinforcing member includes a restricting portion that restricts a swing range of the arm portion by contact of the arm portion, the restricting portion extending toward the swing track of the 3 rd swing portion.
That is, a part of the tip end side of the swing portion is close to the reinforcing member side, and the size of the regulating portion extending from the reinforcing member toward the swing portion is also reduced. This can reduce the overall size of the liquid level detection device.
In the invention recited in claim 6, the front end of the regulating portion is curved on the side of the swing range. Thus, when the arm portion swings, even when the swing portion moves in a direction away from the reinforcement member, the swing portion can be brought into contact with the tip of the regulating portion. As a result, the arm portion can be prevented from coming out of the swing range.
In the invention recited in claim 7, the base includes a cylindrical portion through which the rotation shaft portion can penetrate. That is, the rotation shaft portion can be supported by the cylindrical portion. Since the number of portions capable of supporting the rotation shaft portion is increased, the arm portion that rotates about the rotation shaft portion can be suppressed from wobbling.
Drawings
Fig. 1 is a perspective view of a liquid level detection device according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view of the liquid level detection device shown in FIG. 1;
FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1;
FIG. 4 is a view illustrating the reinforcement member and the arm portion shown in FIG. 2;
fig. 5 is a view illustrating the other end portion of the arm portion shown in fig. 2;
fig. 6 is a diagram illustrating a liquid level detection device according to a modification of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. In the figure, Fr denotes front, Rr denotes rear, L denotes left, R denotes right, Up denotes upper, Dn denotes lower, and L, R is oriented in a direction from front to rear.
< example >
Refer to fig. 1. Fig. 1 shows a liquid level detection device 10 according to an embodiment of the present invention. The liquid level detection device 10 is of a float type using a float floating on a liquid surface, and the liquid level detection device 10 is provided in a fuel tank storing liquid fuel such as gasoline, for example. The remaining amount of fuel is indicated by a fuel gauge based on the detected height of the liquid level.
Refer to fig. 1 and 2. The liquid level detection device 10 includes: a stopper flange 11 attached to an upper portion of a fuel tank or the like; a base 20, the base 20 extending from the stop flange 11 to the lower side of the fuel tank; a sensing unit 12, the sensing unit 12 being supported on the base 20; and a float 13, wherein the float 13 floats on the liquid surface. The liquid level detection device 10 may be attached to a side wall of a fuel tank or the like.
The arm portion 30 is made of metal, the arm portion 30 is composed of a rotation shaft portion 31 and a swinging portion 33, the rotation shaft portion 31 penetrates the sensor unit 12, and the swinging portion 33 extends from one end portion 32 of the rotation shaft portion 31.
The base 20 is L-shaped, and the base 20 is formed of a substantially U-shaped bottom portion 21 and a wall portion 22, the bottom portion 21 being welded to the middle of the stopper flange 11, and the wall portion 22 extending downward from the end of the bottom portion 21. Ribs 23, 23 are formed at the boundary of the bottom 21 and the wall 22. A projection 24 is formed at the bottom end of the wall portion 22, and the projection 24 projects from the wall portion 22 toward the sensing unit to determine the position of the sensing unit 12.
The sensor unit 12 includes an arm portion 30, a holder 40, a sensor body 50 made of resin, and a reinforcing member 60 made of metal, the arm portion 30 is provided swingably, the holder 40 is attached to the arm portion 30, the sensor body 50 holds the arm portion 30, and the reinforcing member 60 reinforces the sensor body 50. In addition, the sensing unit 12 may include at least a sensor body 50 and a reinforcing member 60. In addition, the sensing unit 12 may also include a float 13.
The sensor body 50 is constituted by a flat portion 51, a protruding portion 52, and a receiving portion 53, the flat portion 51 being inserted into the reinforcing member 60, the protruding portion 52 protruding from the flat portion 51 toward the arm portion 30, the receiving portion 53 being provided on an upper portion of the protruding portion 52.
The flat surface 51 has notches formed at its left and right ends to form the 1 st engaging portion 54 and the 2 nd engaging portion 55 of the engaging reinforcement member 60. The projection 52 is formed with a 1 st through hole 56 through which the rotation shaft 31 passes. The terminals 90 are provided in the receiving portions 53 by insert molding. The pressing portions 91 and 91 at the tip ends of the terminals 90 are pressed against the wires 59 and 59, respectively.
The metal reinforcing member 60 has a substantially U-shape so as to sandwich the sensor body 50, and includes a 1 st surface portion 61, a 2 nd surface portion 62, and a connecting portion 63, the 1 st surface portion 61 facing the sensor body 50, the 2 nd surface portion 62 facing the 1 st surface portion 61, and the connecting portion 63 connecting a bottom end of the 1 st surface portion 61 and a bottom end of the 2 nd surface portion 62.
On both ends of the 1 st surface portion 61, 1 st to 4 th holding portions 64 to 67 cut out from the 1 st surface portion 61 are formed. If the sensor body 50 is attached to the reinforcing member 60, the 1 st catching portion 54 of the sensor body 50 is caught between the 1 st holding portion 64 and the 2 nd holding portion 65. Similarly, the 2 nd engaging portion 55 is engaged between the 3 rd holding portion 66 and the 4 th holding portion 67.
A 1 st regulating portion 71 is formed at the tip of the 1 st surface portion 61, and the 1 st regulating portion 71 regulates the swing range R of the arm 30 by the contact of the arm 30 (see fig. 4 a). Similarly, a 2 nd regulating portion 72 is formed at the bottom end of the 1 st surface portion 61, and the 2 nd regulating portion 72 regulates the swing range R of the arm portion 30 by the contact of the arm portion 30.
A 2 nd through hole 68 through which the rotation shaft 31 penetrates is formed in the middle of the 1 st surface portion 61. A positioning hole 25 into which the projection 24 is fitted is formed at the tip of the 1 st surface portion 61. A 3 rd through hole 69 through which the rotation shaft 31 penetrates is formed at the tip of the 2 nd surface portion 62. The wall portion 22 includes a 4 th through hole 26 through which the rotation shaft portion 31 penetrates.
The holder 40 is formed of a synthetic resin, and fixes the arm portion 30 so as not to fall off the sensor unit 12. The holder 40 has a ceramic circuit board on a surface facing the sensor body 50. The circuit substrate includes a layout that is contactable with the contact portions 92 of the bottom ends of the terminals 90. The detailed description of the circuit substrate and layout is omitted.
The operation of the liquid level detection device 10 will be described. The liquid level detection device 10 is fixed to the upper portion of the fuel tank via a stopper flange 11. If the fuel is consumed and the liquid level in the fuel tank is lowered, the float 13 is displaced downward, and the arm portion 30 to which the float 13 is attached swings. If the arm portion 30 swings, the holder 40 swings together with the arm portion 30. At this time, the circuit substrate provided on the holder 40 slides with respect to the contact portion 92 provided on the sensor body 50. That is, the position at which the contact portion 92 contacts the circuit substrate changes according to the height of the liquid surface. The height of the liquid surface is detected by outputting a signal corresponding to the position of contact.
Refer to fig. 2 and 3. The holder 40 has a substantially J-shaped cross section and includes a holding portion 41 holding the 1 st through hole 56. The clamping portion 41 is formed with a 1 st holding hole 42 and a 2 nd holding hole 43 through which the rotation shaft portion 31 penetrates. The 1 st through hole 56 is located between the 1 st holding hole 42 and the 2 nd holding hole 43. The holding portion 41 is held by the 2 nd through hole 68 and the 3 rd through hole 69. Further, the holder 40 includes a restraining portion 44 that restrains the arm portion 30 from moving in the axial direction of the rotation shaft portion 31.
The 1 st through hole 56 to the 4 th through hole 26 are located on the same axis C. The diameters D2 through D4 of the 2 nd through hole 68 are equal to the diameter D1 of the 1 st through hole 56.
Refer to fig. 4(a) and 4 (b). The swing portion 33 has a substantially crank shape with a portion thereof bent. Specifically, the swing portion 33 includes a 1 st swing portion 35, a 2 nd swing portion 36, and a 3 rd swing portion 37, the 1 st swing portion 35 extending from the one end portion 32 of the rotation shaft portion 31, the 2 nd swing portion 36 extending from the tip of the 1 st swing portion 35, and the 3 rd swing portion 37 extending from the tip of the 2 nd swing portion 36.
The tip end portion 36a of the 2 nd swing portion 36 is positioned on the reinforcing member 60 side of the tip end portion 35a of the 1 st swing portion 35.
The 1 st regulating portion 71 includes a 1 st projecting portion 73, and the 1 st projecting portion 73 extends toward the swing track of the 3 rd swing portion 37. A 1 st bent portion 75 bent on the side of the swing range R is formed at the front end of the 1 st protruding portion 73.
Similarly, the 2 nd restricting portion 72 includes: and a 2 nd projecting portion 74, the 2 nd projecting portion 74 extending toward the swing track of the 3 rd swing portion 37. At the tip of the 2 nd projecting portion 74, a 2 nd bent portion 76 that is bent on the side of the swing range R is formed.
Refer to fig. 5 (c) and 5 (d). The other end 34 of the rotating shaft 31 is substantially flat. The dimension of the other end portion 34 in the longitudinal direction is larger than the diameter of the rotation shaft portion 31 with respect to a state viewed from the axial direction of the rotation shaft portion 31, and the longitudinal direction of the other end portion 34 coincides with the direction in which the swinging portion 33 extends.
The effects of the present invention will be explained below.
Refer to fig. 2 and 3. The sensor unit 12 includes a metal reinforcing member 60 that reinforces the resin-made sensor body 50. The metal reinforcing member 60 is formed in a substantially U-shape so as to sandwich the sensor body 50, and includes a 1 st surface portion 61 and a 2 nd surface portion 62 facing the sensor body 50, and the 2 nd surface portion 62 faces the 1 st surface portion 61 to sandwich the sensor body 50. The rotation shaft 31 of the arm 30 penetrates all of the 1 st through hole 56 formed in the sensor body 50, the 2 nd through hole 68 formed in the 1 st surface portion 61, and the 3 rd through hole 69 formed in the 2 nd surface portion 62.
That is, the 1 st through hole 56 made of resin is sandwiched between the 2 nd through hole 68 and the 3 rd through hole 69 made of metal. Thus, the rotation shaft 31 is supported by the 2 nd through hole 68 and the 3 rd through hole 69 as well as the 1 st through hole 56. The load acting on the 1 st through-hole 56 can be reduced, and the 1 st through-hole 56 is less likely to be expanded by abrasion. This restricts the swing of the arm 30. As a result, a signal corresponding to the height of the float 13 can be reliably output, and the liquid level can be accurately detected.
The 1 st through hole 56 to the 3 rd through hole 69 are located on the same axis C, and the diameter D2 of the 2 nd through hole 68 and the diameter D3 of the 3 rd through hole 69 are equal to the diameter D1 of the 1 st through hole 56. Thereby, the rotation shaft 31 of the arm 30 is simultaneously supported by the 1 st through hole 56 to the 3 rd through hole 69. As a result, the arm 30 can be further suppressed from wobbling.
Refer to fig. 4(a) and 4 (b). The swing portion 33 has a substantially crank shape with a portion thereof bent, and the tip portion 36a of the 2 nd swing portion 36 is positioned on the reinforcing member 60 side of the tip portion 35a of the 1 st swing portion 35.
The reinforcing member 60 includes a 1 st regulating portion 71 and a 2 nd regulating portion 72 that regulate the swing range R of the arm portion 30 by the contact of the arm portion 30, and a 1 st projecting portion 73 and a 2 nd projecting portion 74 provided on the 1 st regulating portion 71 and the 2 nd regulating portion 72 extend toward the swing path of the 3 rd swing portion 37.
That is, the 3 rd swing portion 37 is close to the reinforcing member 60 with respect to the 1 st swing portion 35, and the 1 st projecting portion 73 and the 2 nd projecting portion 74 extending from the reinforcing member 60 toward the 3 rd swing portion 37 are also short in size. This can reduce the overall size of the liquid level detection device 10.
Further, a 1 st bent portion 75 bent on the side of the swing range R is formed at the front end of the 1 st protruding portion 73. Similarly, a 2 nd bent portion 76 bent toward the swing range R is formed at the front end of the 2 nd projecting portion 74. Thus, even when the swing portion 33 moves in a direction away from the reinforcing member 60 side when the arm portion 30 swings, the swing portion 33 can contact the leading ends of the 1 st bent portion 75 and the 2 nd bent portion 76. As a result, the arm 30 can be prevented from being separated from the swing range R.
Refer to fig. 5 (a) and 5 (b). Fig. 5 (a) and 5 (b) show a liquid level detection device having an arm portion 100 of a comparative example. The other end 102 of the rotating shaft 101 is substantially flat, and the longitudinal direction of the other end 102 is orthogonal to the direction in which the swinging portion 104 extends. Accordingly, as shown by the arrow (1), when the arm portion 100 is intended to vibrate in the lateral direction (the front-rear direction), that is, when the swinging portion 104 vibrates in a direction away from or toward the sensor unit 12 with the one end portion 103 of the rotation shaft portion 101 as a base point, the other end portion 102 of the rotation shaft portion 101 does not contact the wall portion 22 of the base 20, and the lateral vibration of the arm portion 100 cannot be suppressed.
Refer to fig. 5 (c) and 5 (d). Fig. 5 (c) and 5 (d) show a liquid level detection device 10 (see fig. 1) according to an embodiment of the present invention. The other end portion 34 of the rotation shaft portion 31 is substantially flat plate-shaped, and the dimension in the longitudinal direction of the other end portion 34 is larger than the diameter of the rotation shaft portion 31 with respect to the state viewed in the axial direction of the rotation shaft portion 31, and the longitudinal direction of the other end portion 34 coincides with the direction in which the swing portion 33 extends. Accordingly, as shown by the arrow (2), when the swinging portion 33 vibrates in a direction away from or toward the reinforcing member 60 with the one end portion 32 of the rotation shaft portion 31 as a base point, the other end portion 34 of the rotation shaft portion 31 comes into contact with the wall portion 22 of the base 20, and the lateral vibration of the arm portion 30 cannot be suppressed.
In addition, the diameter D2 of the 2 nd through hole 68 and the diameter D3 of the 3 rd through hole 69 are also larger than the diameter D1 of the 1 st through hole 56. In this case, even when the 1 st through hole 56 wears and the hole becomes large, the rotation shaft 31 contacts the 2 nd through hole 68 and the 3 rd through hole 69. As a result, the 1 st through hole 56 can be prevented from becoming larger, and the swing of the arm 30 can be restricted within a predetermined range. Further, by making the sizes of the respective holes different, the rotation shaft portion 31 can be easily inserted, and assembly can be easily performed.
< modification example >
Refer to fig. 6 (a). The liquid level detection device 10A according to modification 1 includes a cylindrical portion 27 through which the rotation shaft portion 31 can penetrate. The same components as those in the embodiments are denoted by the same reference numerals as in the embodiments, and the description thereof will be omitted.
The cylindrical portion 27 is formed, for example, by: holes 28 formed in advance in the wall portion 22A of the base 20A are drilled. That is, the cylindrical portion 27 is formed integrally with the wall portion 22A along the edge of the hole 29 of the wall portion 22A. The cylindrical portion 27 is located on the opposite side to the reinforcing member 60.
The bore 29 is located on the same axis C as the 1 st and 2 nd through bores 56, 68. The diameter D5 of the hole 29 (the inner diameter of the cylindrical portion 27) is equal to the diameter D1 of the 1 st through hole 56 and the diameter D2 of the 2 nd through hole 68.
The liquid level detection device 10A of modification 1 achieves not only the effects of the liquid level detection device 10 of the embodiment but also the following effects. The liquid surface detection device 10A includes a cylindrical portion 27 through which the rotation shaft portion 31 can penetrate. That is, the rotation shaft 31 can be supported by the cylindrical portion 27. Since the number of portions capable of supporting the rotation shaft 31 is increased, the arm 30 rotating about the rotation shaft 31 can be prevented from wobbling.
Refer to fig. 6 (b) and 6 (c). The liquid surface detection device 10B of modification 2 and the liquid surface detection device 10C of modification 3 each include a collar 80 (cylindrical portion 80) through which the rotation shaft portion 31 can penetrate.
Refer to fig. 6 (b). The collar 80 in modification 2 is welded in a state of being inserted into the hole 29A formed in the wall portion 22B of the base 20B. Specifically, the outer peripheral surface 81 of the collar 80 contacts the inner peripheral surface of the hole 29A. The end face portion 82 of the collar 80 is in contact with the reinforcing member 60.
The collar 80 is located on the same axis C as the 1 st and 2 nd through holes 56, 68. The inner diameter D6 of the collar 80 is equal to the diameter D1 of the 1 st throughbore 56 and the diameter D2 of the 2 nd throughbore 68.
Refer to fig. 6 (c). The collar 80 in modification 3 is welded to the wall portion 22. The end face portion 82 of the collar 80 contacts the wall portion 22.
The collar 80 is located on the same axis C as the 1 st, 2 nd and 4 th through holes 56, 68 and 26. The inner diameter D6 of the collar 80 is equal to the diameter D1 of the 1 st through hole 56, the diameter D2 of the 2 nd through hole 68, and the diameter D4 of the 4 th through hole 26.
The liquid level detection device 10B of modification 2 and the liquid level detection device 10C of modification 3 both achieve the same effects as the liquid level detection device 10A of modification 1. The description thereof is omitted.
Further, the diameter D5 of the hole 29 may be larger than the diameter D1 of the 1 st through hole 56. Likewise, the inner diameter D6 of the collar 80 may also be greater than the diameter D1 of the 1 st throughbore 56.
The present invention is also applicable to a liquid level detecting device for detecting a liquid level by displacement and magnetic change of a float. That is, the present invention is not limited to the embodiments as long as the action and effect of the present invention are achieved.
Possibility of industrial utilization
The liquid level detection device of the present invention is preferably used in a case where the device is mounted on a fuel tank of a construction machine.
Description of reference numerals:
symbol R represents a swing range;
symbol D1 represents the diameter of the 1 st through hole;
symbol D2 represents the diameter of the 2 nd through hole;
symbol D3 represents the diameter of the 3 rd through hole;
symbol D4 represents the diameter of the 4 th through hole;
symbol D5 represents the diameter of the hole (inner diameter of the cylindrical portion);
reference numeral D6 denotes the inner diameter of the cylindrical portion.
Claims (7)
1. A liquid level detection device, comprising: a base; a sensing unit supported on the base; an arm portion provided on the sensor unit in a swingable manner; a float mounted on the front end of the arm portion and floating on the liquid surface,
the arm portion includes a rotation shaft portion penetrating the sensor unit and a swinging portion extending from one end portion of the rotation shaft portion;
a liquid level detecting device for outputting a signal corresponding to a height of the float;
the method is characterized in that:
the sensing unit includes: a sensor body made of resin, the sensor body holding the arm portion; a reinforcing member made of metal, the reinforcing member reinforcing the sensor body;
the metal reinforcing member is formed in a U-shape so as to sandwich the sensor body, and includes: a 1 st face, the 1 st face facing the sensor body; the 2 nd face, the 2 nd face is faced with the 1 st face, grasp the body of the sensor;
the rotating shaft portion penetrates: the sensor body includes a 1 st through hole formed in the sensor body, a 2 nd through hole formed in the 1 st surface portion, and a 3 rd through hole formed in the 2 nd surface portion.
2. The liquid level detecting device according to claim 1, wherein the 1 st through hole to the 3 rd through hole are located on the same axis;
the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are equal to the diameter of the 1 st through hole.
3. The liquid level detecting device according to claim 1, wherein the 1 st through hole to the 3 rd through hole are located on the same axis;
the diameter of the 2 nd through hole and the diameter of the 3 rd through hole are larger than the diameter of the 1 st through hole.
4. The liquid surface detection device according to any one of claims 1 to 3, wherein the other end portion of the rotation shaft portion is flat plate-shaped;
the other end of the rotation shaft portion has a dimension in the longitudinal direction larger than the diameter of the rotation shaft portion and the longitudinal direction of the other end coincides with the direction in which the swing portion extends, as viewed in the axial direction of the rotation shaft portion.
5. The liquid level detection device according to any one of claims 1 to 3, wherein the swing portion has a partially curved crank shape, and the swing portion includes a 1 st swing portion extending from the one end of the rotation shaft portion, a 2 nd swing portion extending from a tip of the 1 st swing portion, and a 3 rd swing portion extending from a tip of the 2 nd swing portion;
a tip of the 2 nd swing portion is positioned on the reinforcing member side with respect to a tip of the 1 st swing portion;
the reinforcing member includes a restricting portion that restricts a swing range of the arm portion by contact of the arm portion;
the restricting portion extends toward the swing track of the 3 rd swing portion.
6. The liquid level detection device according to claim 5, wherein a tip end of the regulating portion is curved on the side of the swing range.
7. The liquid surface detection device according to any one of claims 1 to 3, wherein the base includes a cylindrical portion through which the rotation shaft portion can penetrate.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP2018097002 | 2018-05-21 | ||
| PCT/JP2018/020136 WO2018221399A1 (en) | 2017-05-30 | 2018-05-25 | Liquid level detection device |
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| CN2371546Y (en) * | 1999-05-06 | 2000-03-29 | 丹东市通博电器有限公司 | Electric float level transmitter |
| US20050139003A1 (en) * | 2003-02-26 | 2005-06-30 | Rudolph Bergsma Trust | Hermetic fuel level sender |
| JP4867531B2 (en) * | 2006-09-01 | 2012-02-01 | 株式会社デンソー | Liquid level detector |
| JP4957493B2 (en) * | 2007-10-01 | 2012-06-20 | 株式会社デンソー | Liquid level detector |
| JP2009243990A (en) * | 2008-03-31 | 2009-10-22 | Nippon Seiki Co Ltd | Liquid level detecting device |
| JP2009276103A (en) * | 2008-05-13 | 2009-11-26 | Alps Electric Co Ltd | Liquid level sensor |
| JP5152679B2 (en) * | 2009-03-27 | 2013-02-27 | 日本精機株式会社 | Liquid level detector |
| JP5647021B2 (en) * | 2011-01-24 | 2014-12-24 | 矢崎総業株式会社 | Liquid level detector |
| JP5825520B2 (en) * | 2011-12-28 | 2015-12-02 | 日本精機株式会社 | Liquid level detector |
| JP6061137B2 (en) * | 2013-01-21 | 2017-01-18 | 日本精機株式会社 | Liquid level detector |
| CN103616058A (en) * | 2013-12-06 | 2014-03-05 | 安徽江淮汽车股份有限公司 | Sealed fuel quantity transducer |
| JP2017053692A (en) * | 2015-09-09 | 2017-03-16 | 日本精機株式会社 | Liquid level position detection device |
| CN206019792U (en) * | 2016-08-31 | 2017-03-15 | 西安恒基光电科技有限责任公司 | Case liquid level detection device is sent out in accumulating |
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| WO2018221399A1 (en) | 2018-12-06 |
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