KR20110101932A - Sealed fuel level sensor - Google Patents

Abstract

The present invention provides a fuel including a float mounted inside a fuel tank and floating due to a change in fuel level, a float arm rotated and interlocked about an axis by a float, and a ceramic printed resistance substrate in contact with a contact portion of the float arm linked thereto. In the waterproof fuel sensor for detecting the amount of fuel in the tank,
The surface of the ceramic printed resistance substrate in contact with the contact portion relates to a waterproof fuel sensor coated with a lubricant on the contact portion, characterized in that the lubricant is applied.
The present invention improves the wear resistance of the contact portion and the resistance terminal portion, protects the ceramic substrate from chemical reactions when the external fuel vapor penetrates into the sensor, and prevents wear powder caused by contact friction between the contact portion and the resistance terminal portion. There is an effect of reducing the occurrence of noise.

Description

Sealed fuel level sensor with lubricant applied to the contact area

The present invention relates to a fuel sensor provided in a fuel tank and detecting a fuel remaining amount of a vehicle by using a float whose position is changed according to the amount of fuel. More particularly, in a waterproof fuel sensor, the wear resistance of the electrical contact portion is improved and The present invention relates to a waterproof fuel sensor in which a lubricant is applied to a contact portion in order to expect an effect such as noise reduction.

In general, a vehicle is equipped with a waterproof fuel sensor for detecting the fuel amount of the fuel tank, the waterproof fuel sensor is installed inside the fuel tank and floats due to the change in the water level of the fuel tank, and around the axis by the float And a ceramic printed resistive substrate in contact with the contact plate which is rotated and the contact point of the contact plate which is interlocked.

In the ceramic printed resistive substrate applied to the waterproof fuel sensor, a plurality of segments are formed at a predetermined interval, and these segments are formed to be angularly divided about an imaginary axis. The angular division means that the interval between the segment and the next segment forms the circumferential angle θ, and the circumferential angle θ is uniformly formed.

In other words, the interval between one side and the other side of the segment, and one side and the other side of the next segment is different, and the interval is trapezoidal as a whole.

However, in this structure, as the contact plate is rotationally interlocked by the float, the contact point provided on the contact plate moves on the segment of the ceramic printed resistive substrate. In this process, the contact point gradually wears out. As the height between each segment varies, that is, the surface of the printed resistive substrate is uneven, wear occurs at the contact point and the print resistance. This wear phenomenon acts as a cause of poor contact between the contact point and the segment, and after a long time, noise occurs as shown in the upper graph of FIG. 6, leading to failure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof fuel sensor coated with a lubricant on a contact portion according to the present invention, which solves the noise problem occurring in the related art.

In addition, another object of the present invention is a waterproof fuel sensor coated with a lubricant on the contact point according to the present invention excellent in reproducibility while eliminating the complexity and instability of the field frame blocking and the existing sealing type fuel sensor most frequently generated in the fuel sensor To provide.

Objects of the present invention as described above are provided in the fuel tank and the fuel sensor for detecting the fuel remaining amount of the vehicle by a float whose position is changed according to the amount of fuel, one side is provided with a power connection connected to the input tube and the output tube inside A body formed by communicating with the power connection part and having a groove formed at a center thereof, and having a fixing part separated from the accommodation part at a position adjacent to the accommodation part, and a plurality of housings accommodated in the accommodation part and having different resistance values; A ceramic printed resistor substrate having resistance terminals arranged in an arc shape by dividing the two resistance terminals into two, and a contact portion connecting the divided resistance terminals in contact with the two divided resistance terminals of the plurality of resistance terminals; The contact portion is attached to one side of the contact portion so as to rotate along the resistance terminals arranged in an arc shape. A circular plate interlocking with the contact portion incorporating several magnets, a ceramic printed resistive substrate embedded in the accommodating portion, a contact portion, and a body to cover the circular plate to be hermetically protected, and the ceramic printed resistive substrate and the contact portion inside; A cover formed by penetrating a circular plate to be inserted into a groove of the receiving portion, a horizontal guide guiding horizontally on the outside, and forming two protrusions at a position corresponding to the first protrusion, and a fixing portion of the body On the lower side of the fixing piece and the fixing piece which is provided on one side of the rotating part is inserted and rotated around the fixing part and one gear that is interlocked with the rotating part and the fixing hole provided on the outside of the one gear The formed interference fit portion and the outer circumferential surface are engaged with the first gear, one side is in close contact with the outer side of the cover, and the inside is a circular plate. A float arm holder comprising a plurality of gears interlocking a circular plate when one gear is rotated by a plurality of magnets corresponding to the magnet of the float, and guided to the horizontal guide, and one side of which is fixed to the fixing hole. The vicinity of one side is fixed to the interference fitting portion, the other side is connected to the float in which the floating position is changed in accordance with the fuel level in the fuel tank includes a float arm that rotates around the rotating part in accordance with the position change of the float,

A lubricant is applied to the contact terminal, characterized in that a lubricant is applied to the surface of the resistor terminal to reduce friction between the resistor terminal and the contact portion.

According to the present invention, while the electrical configuration (ceramic printed resistance substrate, contact portion, etc.) is hermetically configured by the case and the cover, the fuel level measurement using the float and the float arm is configured outside the case and is provided with a magnet that interlocks with the float arm. Float arm holder equipped with external gear and a circular plate which is formed inside the case and interlocked with the magnet are used to secure the airtightness of the electrical configuration by the fuel. This has the effect of improving the reliability of the fuel sensor.

In addition, by using the gear ratio of the float arm holder, the arrangement length of the resistance terminals arranged in an arc shape can be freely adjusted. By adjusting the gear ratio of the float arm holder, the magnetic force required for the magnet, that is, the size of the magnet, can be adjusted. There is an effect that can be reduced.

In addition, it improves the wear resistance of the contact portion and the resistance terminal portion, protects the ceramic substrate from chemical reaction when the external fuel vapor penetrates into the sensor, and prevents wear powder due to contact friction of the contact portion and the resistance terminal portion of FIG. As shown in the graph, noise is reduced.

1 is a perspective view showing an example of a fuel sensor according to the present invention;
2 is an exploded perspective view of FIG. 1;
3 is a perspective view of another angle of FIG.
Figure 4 is a side view showing only the ceramic printed resistive substrate and the contact portion of the configuration of the fuel sensor according to the present invention;
5 is a view showing in detail a ceramic print resistance substrate of a fuel sensor according to the present invention;
6 is a view comparing the degree of noise generation when the lubricant is applied to the substrate according to the present invention and not.

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention will be described in detail.

The present invention relates to a fuel sensor provided in the fuel tank to detect the fuel remaining amount of the vehicle by the float whose position is changed according to the fuel amount.

The present invention is largely the body 10, the ceramic printed resistance substrate 30, the cover 20, the contact portion 40, the circular plate 50, the float arm holder 60, and the float arm ( 70).

As shown in FIG. 2, the body 10 includes a power connection part 12 to which an input pipe 12a and an output pipe 12b are connected, an accommodation part 11 communicating with the power connection part 12, and the accommodation part ( 11) and a fixed portion ("U" shaped groove 13, insert 14) is isolated from.

The power connection part 12 communicates with the receiving part 11, but when the covering part 11 is covered with the cover 20, the power connection part 12 is sealed together with the receiving part 11, and the receiving part 11 has one side open. It communicates with the power connection 12 and is isolated from the fixed part. In addition, the accommodating part 11 has a space for accommodating the ceramic printed resistive substrate 30 having the resistance terminal part 31 in which a plurality of divided resistance terminals having different resistance values are arranged in an arc shape. The groove 15 is formed. The groove 15 is formed to insert the one protrusion 21a of the cover 20, and the one protrusion 21a is the ceramic printed resistance substrate 30 and the contact portion 40. And penetrates the circular plate 50 and is inserted into the groove 15.

The ceramic printed resistive substrate 30 has a configuration in which the resistor terminal portions 31 are arranged in an arc shape having a plurality of divided resistor terminals. That is, the divided resistance terminals are divided into two as shown in FIG. 5 so that one resistance terminal 31a is connected to the positive electrode, and the other resistance terminal 31b is connected to the negative electrode. To this end, two lead wires (not shown) are connected to one side of the ceramic printed resistive substrate 30, and the lead wires are protected by the input pipe 12a and the output pipe 12b of the power connection part 12 and connected to an external power source. do. Meanwhile, in the present invention, the power connector 12 may be connected to the ceramic printed resistive substrate 30 in the form of a connector so as to be connected to the resistor terminal 31. Such a configuration is conventional.

In addition, the resistance terminal 31 has a lubricant 220 is applied to the surface to reduce friction with the contact portion 40, which will be described later, such a lubricant improves the wear resistance of the contact portion and the resistance terminal portion, the external fuel vapor When the sensor penetrates into the sensor, it protects the ceramic substrate from chemical reaction and prevents abrasion powder caused by contact friction between the contact portion and the resistance terminal, thereby reducing noise as shown in FIG. 6.

The contact portion 40 contacts the divided resistance terminal of any one of a plurality of resistance terminals and connects the divided resistance terminals, and a center thereof is inserted into the first protrusion 21a to rotate about the one protrusion 21a. .

As shown in FIGS. 2 to 4, the contact portion 40 has a first gap between the first U-shaped plate 42 and the inner circumferential surface of the first U-shaped plate 42. The second "U" shaped plate 43 provided on the inner circumferential surface side of the "shaped plate 42" and the contact points 44 provided on one side of the first and second "U" shaped plates 42 and 43, respectively, 45) and the first and second " U " shaped plates 42 and 43 are attached to the plate 41 is inserted into the one projection (21a). Here, the curved portions of the first and second “U” shaped plates 42 and 43 may protrude outward from one side of the plate 41 and be spaced apart from one surface of the plate 41. This is to prevent the points 44 and 45 from being separated from the resistance terminals of the resistance terminal portion 31. Here, the contact points 44 and 45 are provided as conductors on the bends of the first " U " plate 42 and the second " U " plate 43, respectively, to contact the resistor terminals and to be conductors. ) Through the resistance terminal divided into two through the power did not go through.

The circular plate 50 is attached to one side of the contact portion 40 so that the contact portion 40 rotates along the resistance terminal portion 31 arranged in an arc shape, and is inserted into the one protrusion portion 21 to be interlocked with the contact portion 40. . A plurality of magnets 81 and 82 are embedded in the circular plate 50 as shown in FIG. 2.

As shown in FIGS. 1 to 3, the lid 20 includes a ceramic printed resistive substrate 30, a contact portion 40, and a circular plate 50 embedded in the accommodating portion 11 from the outside (fuel). Covering the body (10) so as to protect the airtight is formed with one projection (21a) on the inside, the two projections (21b) in the position corresponding to the horizontal guide 22 and the one projection (21a) to guide the horizontal on the outside It is formed.

The float arm holder 60 is inserted into a fixed part of the body 10 to form a rotation part 61 that forms an insertion hole 61a that rotates about the fixed part, and is provided on one side of the rotation part 61 and a rotation part. A fixing piece 63 having a first gear 62 interlocked with the 61, a fixing hole 63a provided on the outside of the first gear 62, and a forcing formed on the lower side of the fixing piece 63; The fitting portion 64 and the outer circumferential surface are engaged with the first gear 62, and one side is in close contact with the outside of the cover 20, and the inside thereof has a plurality of magnets 83 corresponding to the magnets 81 and 82 of the circular plate 50. It is configured to include a second gear 65 for interlocking the circular plate 50 when the one gear 62 is rotated inherent to, 84.

The two gears 65 are in close contact with the outer side of the cover 20 and is composed of a rotating plate 65a in which a plurality of magnets 83 and 84 are embedded, and a gear part 65b provided at one side of the rotating plate 65a. The one gear 62 is a structure in which the tooth which meshes with the gear part 65b is formed in the lower side.

The float arm 70 is guided to the horizontal guide 22 as shown in FIGS. 1 to 3, one side of which is fixed to the fixing hole 63a, and one side of the float arm 70 is fixed to the interference fitting portion 64. The other side is connected to a float whose floating position changes in accordance with the fuel level in the fuel tank, and is configured to rotate about the rotating part 61 in accordance with the position change of the float.

Hereinafter will be described the operation relationship of the waterproof fuel sensor configured as described above.

First, the power supply is connected to the resistance terminal 31 of the ceramic printed resistive substrate 30 to complete the preparation for implementation.

When the fuel amount of the fuel tank is full, the float will be positioned at the top of the inside of the fuel tank, and the float arm 70 having the float on one side may be based on the rotating part 61 according to the position of the float. It is rotated and guided to the horizontal guide 22 to be located on the left or right side of the cover 20. Then, the first gear 62 of the float arm holder 60 fixing the float arm 70 is interlocked according to the float arm 70 and the second gear 65 is rotated forward or reversely by the first gear 62. do. At the same time, when the two gears 65 are rotated, the circular plate 50 is also rotated by the magnets 83 and 84 of the two gears 65 and the magnets 81 and 82 of the circular plate 50. The plate 41 attached to the 50 also rotates so that the first and second " U " shaped plates 42 and 43 are rotated so that the contact points 44 and 45 are divided into two parts of the ceramic printed resistance substrate 30. Among the plurality of resistor terminals, the resistance value is located at the smallest or largest divided resistance terminal, and the measured resistance value is transmitted to the controller (not shown), and the fuel gauge substrate is driven by the controller to fill the fuel gauge. Indicates true.

On the other hand, when the vehicle is driven and the fuel amount is exhausted, the float is gradually lowered at the position of the top of the inside of the fuel tank, by the float arm 70, the float arm holder 60, the circular plate 50 interlocked with it The contact points 44 and 45 of the contact portion 40 are located at the resistance terminals having the largest or smallest resistance value among the divided resistance terminals of the ceramic printed resistance substrate 30, and the resistance values measured through the control portion are The fuel gauge substrate is transferred to the fuel gauge substrate by the control unit, and thus the fuel gauge substrate indicates an empty state of the fuel amount.

In this case, when the fuel amount is full, when the resistance value of the divided resistance terminal where the contact points 44 and 45 are located is the largest, the empty value will be the smallest resistance value of the divided resistance terminal. On the other hand, this can also be interpreted inversely, such a process is a conventional description of the brief description.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will readily occur to those skilled in the art without departing from the spirit and scope of the invention. Therefore, it should be understood that the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense, and that the true scope of the invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof, .

10: body 20: cover
30: ceramic printed resistor substrate 40: contact portion
50: round plate 60: float arm holder
70: float arm 11: receiving portion
12: power connection 12a: input tube
12b: Output Tube 13: "U" Groove
14: inserting portion 15: groove
21a: 1 protrusion 21b: 2 protrusion
22: horizontal guide 31: resistance terminal
31a, 31b: Resistance terminal 41: Plate
42: first "U" shaped plate 43: second "U" shaped plate
44,45: contact point 61: rotating part
61a: insertion hole 62: 1 gear
63: fixing piece 63a: fixing hole
64: interference fit 65: 2 gear
81,82,83,84: Magnet 220: Lubricant

Claims (4)

Ceramic printing installed inside the fuel tank and floating float due to the change of the water level, the float arm 70 rotated interlocking about the axis by the float, and the contact portion 40 of the float arm 70 linked to the ceramic printing. In the waterproof fuel sensor for detecting the amount of fuel in the fuel tank including a resistor plate 30,
The surface of the ceramic printed resistive substrate 30 in contact with the contact portion 40 is a waterproof fuel sensor coated with a lubricant on the contact portion, characterized in that for applying a lubricant (220). In the fuel sensor which is provided in the fuel tank and detects the remaining fuel of the vehicle by a float that changes the position according to the amount of fuel,
One side has a power connection 12 connected to the input tube (12a) and the output tube (12b), there is formed a receiving portion 11 in communication with the power connection portion 12 and the groove 15 is formed in the center A body 10 formed at a position adjacent to the accommodating part 11 to form a fixing part separated from the accommodating part 11;
A ceramic printed resistive substrate 30 accommodated in the accommodating part 11 and having a resistor terminal part 31 arranged in an arc shape by dividing each of a plurality of resistor terminals having different resistance values;
A contact unit 40 which contacts the divided resistance terminal of any one of the plurality of resistance terminals and connects the divided resistance terminal;
The contact part 40 is attached to one side of the contact part 40 so as to rotate along the resistance terminal part 31 arranged in an arc shape, and has a circular plate 50 interworking with the contact part 40 by embedding a plurality of magnets therein. ;
The body 10 is covered to protect the ceramic printed resistive substrate 30, the contact portion 40, and the circular plate 50 inherently sealed in the accommodating part 11, and the ceramic printed resistive substrate 30 is formed on the inside thereof. ) And a horizontal guide 22 which penetrates the contact portion 40 and the circular plate 50 to be inserted into the groove 15 of the accommodating portion 11 to be inserted into the groove 15, and guides the outer portion horizontally. A cover 20 formed by forming two protrusions 21b at positions corresponding to the first protrusions 21a;
The rotating part 61 is inserted into the fixing part of the body 10 to form an insertion hole 61a that rotates around the fixing part, and is provided on one side of the rotating part 61 and interlocked with the rotating part 61. A fixing piece 63 having a gear 62, a fixing hole 63a provided outside the first gear 62, an interference fitting portion 64 and an outer circumferential surface formed below the fixing piece 63. Is engaged with the first gear 62, one side is in close contact with the outer side of the cover 20, and the inside has a plurality of magnets (83, 84) corresponding to the magnets (81, 82) of the circular plate 50 1 A float arm holder (60) comprising two gears (65) for interlocking the circular plate (50) when the gear (62) is rotated;
Guided to the horizontal guide 22, one side is fixed to the fixing hole 63, the one side is fixed to the interference fitting portion 61, the other side is a float that changes the floating position in accordance with the fuel level in the fuel tank It includes; and a float arm (70) for rotating around the rotating portion 61 in accordance with the change in the position of the float,
Waterproofing fuel sensor coated with a lubricant on the contact portion, characterized in that the lubricant 220 is applied to the surface of the resistance terminal 31 to reduce the friction between the resistance terminal 31 and the contact portion (40). The method of claim 2,
The fixing portion is a "U" shaped groove 13 to receive the outer circumferential surface of the rotating portion 61, and the "U" shaped groove so that the insertion hole (61a) of the rotating portion 61 of the float arm holder 60 is inserted ( 13. A waterproof fuel sensor coated with a lubricant on a contact portion, characterized in that the insertion portion 14 provided on one side of the 13). The method of claim 2,
The contact portion 40 is provided on the inner circumferential surface side of the first “U” shaped plate 42 with a predetermined gap from the inner circumferential surface of the first “U” shaped plate 42. The second " U " shaped plate 43, the contact points 44 and 45 provided on one side of the first and second " U " shaped plates 42 and 43, and the first and second " Attached to the U "-shaped plate (42, 43) and consists of a plate 41 is inserted into the one projection (21a) of the cover 20,
The curved portions of the first and second "U" shaped plates 42 and 43 are projected outwardly from one side of the plate 41 and spaced apart from one surface of the plate 41. Waterproof fuel sensor with lubricant applied.

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