CN1869608A - Fuel level sensor variable resistor assembly - Google Patents

Abstract

A variable resistor assembly is preferably adapted for use with a fuel level sensor and includes an arcuate resistive area including a plurality of radially oriented and spaced apart conductive contact segments, and further includes a wiper including an arm and at least two contactors carried by the arm, wherein the at least two contactors are arranged on the arm such that the at least two contactors make contact with one of the conductive contact segments before breaking contact with an adjacent one of the conductive contact segments. Preferably, the at least two contactors are laterally offset with respect to one another and/or oriented at an angle with respect to the conductive contact segments.

Description

The variable resistor assembly of fuel level sensor

Related application

The applicant requires to enjoy the U.S. Provisional Patent Application No.60/684 that submitted on May 25th, 2005,272 right of priority.

Technical field

The present invention relates to the fuel level sensor of motor vehicles, particularly, relate to a kind of variable resistor assembly that is used for fuel level sensor.

Background technology

Variable resistor assembly is applied to fuel level sensor usually, the variation of oil level in the fuel tank of machines motor vehicle.Typical variable resistor assembly comprises variable resistor, and its resistance value can change according to the mechanical motion of sliding part, and sliding part is connected to the float of the oil level variation that can respond fuel tank.Typical variable resistor assembly can comprise sliding part, resistance card, and it comprises ceramic substrate and two independent terminals that are positioned on the substrate; With two independent arc resistance areas, it is positioned on the substrate and is electrically connected to terminal.The arc resistance area can be divided into a plurality of conduction contact parts.Sliding part connects resistance area and forms variable resistor, and sliding part pivotally relative resistance card is installed, and has one or more contact elements, can contact the arc resistance area when slide sweeps.

Typical fuel level sensor comprises the float that is connected to the variable resistor assembly slide by the actuator arm, can be according to the resistance value of the position change resistance of float.When the oil level in the fuel tank changed, float member and actuator arm moved, thereby made sliding part slide at the arc resistance area, changed variable-resistance effective length between the terminal, thereby had changed variable-resistance effective resistance.According to changes in resistance, the output voltage of resistance card changes, and causes the variation of remote control oil level indicator, changes as from " expiring " to " sky ".

During use, existing fuel level sensor has many shortcomings.For example, existing fuel level sensor when the sliding part contactor enters between the adjacent conductive contact portion of resistance area and disengages very soon, produces erratic action.In other words, a variable-resistance part is opened a way at once or is interrupted, and therefore makes fuel level sensor output voltage peak value to oil level indicator.Another problem relates to the conduction contact part that sliding part contactor bight is stuck in the inclination of arc resistance area.When the inswept resistance area of sliding part, the sharp corner of contactor may be stuck in the conduction contact part of inclination, therefore forms variable-resistance noise operation.

Summary of the invention

A kind of variable resistor assembly of fuel level sensor comprises resistance area and slide, and it is arranged to removable by resistance area, and resistor contact continuously simultaneously, prevents open-circuit condition.Resistance area comprises a plurality of isolated conduction contact parts that are disposed radially, and slide comprises arm; At least two contact elements that are supported on arm.Contact element is arranged on arm makes contact element always keep in touch a plurality of at least two adjacent parts radially that be provided with and isolated conduction contact part.Wherein whenever, contact element, disconnect with the contacting of second contact portion of at least two adjacent parts before, always keep in touch first contact portion of at least two adjacent parts, so can prevent that open-circuit condition from appearring in variable resistor assembly.At least two preferably relative lateral offset of contact element and/or the conduction contact part that is disposed radially relatively form an angle.

Can be by at least some purposes of at least some embodiment realizations of the present invention, feature and advantage comprise provides a kind of variable resistor assembly, and it is fit to various fuel level sensors very much, can prevent open-circuit condition; Reduce to use the high noble metal of price comparison, and have simple relatively design and economic manufacture method and installation, solid, durable, reliable and have the long life.

Certainly, other purposes of the present invention, feature and advantage are clearly for reading those skilled in the art of the present disclosure.Realizing that various other devices of the present invention can have is similar to disclosed purpose, feature or advantage.

Description of drawings

Below reading,, can with other purposes, feature and advantage clearer understanding be arranged to the present invention is above-mentioned to the detailed introduction of preferred embodiment and preference pattern and with reference to claims and accompanying drawing, in the accompanying drawing:

Fig. 1 is the synoptic diagram of vehicle, and vehicle comprises the tank mounting of the oil plant pump module with exemplary fuel level sensor mechanism;

Fig. 2 is the skeleton view that the part of oil plant pump module is amplified, and demonstrates fuel level sensor mechanism;

Fig. 3 is the planimetric map of exemplary electrical blocked portion of the fuel level sensor mechanism of Fig. 2;

Fig. 4 is the front view of slide of slide slide plate supporting of the fuel level sensor mechanism of Fig. 1;

As if Fig. 5 is the slide slide plate of Fig. 4 and the top view of slide, has shown that slide deflects into working depth, contact with resistance card;

Fig. 6 is the enlarged side view of contact element of the slide of Fig. 3;

Fig. 7 is the planimetric map of slide of the contact element that comprises straight line and alignment of prior art;

Fig. 8 is the part synoptic diagram of contact element of the prior art slide of straight line stacked on the resistance area that part shows and alignment, and resistance area comprises the adjacent conductive contact portion;

Fig. 9 is the synoptic diagram of contact element of the exemplary slide sheet of Fig. 3, is stacked in to the staggered or lateral offset of slide the resistance area that comprises the adjacent conductive contact portion;

Figure 10 is the planimetric map of selectable exemplary slide sheet;

Figure 11 is the synoptic diagram of contact element of deflection of the selectable slide of Figure 10, and it overlaps the resistance area that comprises the adjacent conductive contact portion;

Figure 12 is the planimetric map of another selectable exemplary slide sheet; With

Figure 13 is the synoptic diagram of the contact element of another selectable exemplary slide sheet, and contact element is inclination and staggered, demonstrates and overlaps the resistance area that comprises the adjacent conductive contact portion.

Embodiment

In detail with reference to the accompanying drawings, Fig. 1 schematically illustrates vehicle 10, and it comprises fuel tank assembly 12, is used for storaging liquid hydrocarbon fuel 14, and fuel supplying 14 arrives internal combustion engines 18 by burning line 16, but internal combustion engine Mechanical Driven vehicle 10.Fuel tank assembly 12 comprises fuel tank 20 that holds oil plant 14 and the oil plant pump module 22 that is fixed in the fuel tank 20 can provide oil plant 14 to engine 18 from fuel tank 20; Vehicular battery 24 provides electric power by lead 26.Oil plant pump module 22 also comprises fuel level sensor 28, is used for surveying the liquid level of oil plant 14 at fuel tank 20, and sends signals by lead 30, and to oil level indicator 32 indication oil levels, the vehicle drive personnel in 10 the crew department of buying car in installments observe or utilize.

When oil plant pump module 22 is installed to fuel tank assembly 20 fully, flange 34 sealed junctions of module 22 are incorporated into the hole 36 on the oil tank wall 38, and oil plant pump module 22 is suspended on the fuel tank 20 by one or more connecting links 40 and shell 42 from flange 34.Shell 42 is provided with fuel inlet 44, and the oil plant 14 that is communicated with in the fuel tank 20 arrives oil strainer 46, and it is connected to oil plant inlet 48 of oil plant pump 50.Oil plant pump 50 is provided with oil plant outlet 51, and it is connected to outlet 52, and outlet is communicated with oil plant pipeline 16 by the oil supply spare 54 of flange 24.The electrical lead 55,56 that has associated fitting 58 extends through flange, provides electric power to arrive electric notor 60 and the fuel level sensor 28 that drives oil plant pump 50.

Still with reference to figure 1, fuel level sensor 28 preferably includes slide float mechanism 62, and it has elongated floating arm 64, and floating arm has matrix end 66, crooked about 90 degree, and pivotally be supported on sensor base 68.The float end 70 far away of floating arm 64 also crooked about 90 is spent, and pivotally is supported on the plastic float 72 of buoyant or hollow.The shape of floatable float 72 generally is plane or rectangle or cylindrical, swims in the surface of the oil plant 14 of fuel tank 20.The length of floating arm 64 determined by the shape and the degree of depth of fuel tank 20, and it should long enough makes the surface of the oil plant 14 of float 72 floatabilitys between minimum and maximum oil level (promptly full of empty fuel tank position).When oil level changes, float 72 rises or descends with the surface of oil plant 14, make floating arm 64 rotate around matrix end 66, the sliding part or the contact element (not shown) of conduction are slided on fuel level sensor 28 parts, inswept or nuzzle up, produce oil level signal, be transmitted to oil level indicator 32 by lead 56 and 30.

With reference now to Fig. 2 and Fig. 3,, oil plant sensor 28 comprises the variable resistor card 74 that is supported on sensor base 68, and matrix is made up of ceramic substrate 76, is printed on variable resistor spare on it.Lead 56 is welded to the conductive connecting piece 78,79 that is imprinted on ceramic substrate 76.Variable resistor card 74 also comprises the common resistance area 82 that is printed on the ceramic substrate 76, and it generally is semicircular or arcuate shape, and preferably the pivot of floating arm 64 is provided with one heart relatively.Arc one speech comprises any shape that can contact with contact element incessantly basically, and contact element moves with the pivot rotating manner on arc.Perhaps, resistance area 82 can have any suitable desirable shape and/or structure.First and second printed wirings or conductive path 80,81 are printed on ceramic substrate 76, and electric connection conductive connecting piece 78,79 is to resistance area 82.

Resistance area 82 comprises first arc of contact portion 84 of normally conducting electricity and the second arc of contact portion 86 of normally conducting electricity.Arc of contact portion 84,86 is subregion preferably, forms a plurality of conduction contact parts 88 that separated by the space.Arc portion 84,86 best shared same center C, it has represented the pivoting point of floating arm 64.The radial line 83,85 of the imagination corresponds respectively to the part 87 of the first arc of contact portion 84 and the part 88 of the second arc of contact portion 86, demonstrates the relative center C of these parts and radially locatees.In addition, be provided with a plurality of normally test pieces 92 of conduction, be electrically connected with resistance area 82, it is as technology auxiliary body, and this is that the those skilled in the art is known.Similarly, be positioned at the big conduction contact part 88 therebetween of horizontal relative conduction contact part of two opposed ends of conduction arc of contact portion 84,86,90, can be used as test pieces or be used as conduction contact part 88,90, all know as the those skilled in the art.

Resistance area 82 also comprises resistance trace 89,91, corresponding to arc of contact portion 84,86, and the resistance trace 89,91 of wherein a plurality of conduction contact part 88,90 electric connection correspondences.Therefore, known to the those skilled in the art, resistance trace 89,91 makes the effective resistance of arc of contact portion 84,86, progressively is increased to relative other end from the end that is connected to printed conductor 80,81 of arc portion 84,86.

The second arc of contact portion 86 is corresponding to the first arc of contact portion 84, radially open with its clear width, make change when the float 72 response oil levels that float; floating arm 64 is installed in electric slide 94 contacts of non-conductive slide slide plate 96 bottom sides on the floating arm and is electrically connected predetermined one or more conduction contact parts 88 of 84 to the first arc of contact portions 84 of the second arc of contact portion of a part on card 74 when inswept.Path 80,81 does not contact with slide 94.It will be understood to one skilled in the art that any arc of contact portion 84,86 also can be arranged to the conduction arc of contact portion that is not continuous relatively, is not subregion.Under any circumstance, the variable resistor of variable resistor card 74 is gone up substantially and is all comprised resistance area 82 and slide 94.

The suitable technology that the variable resistor spare of variable resistor card 74 can use any those skilled in the art all to know is produced, include but not limited to the material of deposition fusing, chemical etching and/or coated ceramic substrate 76, connection or bonding independent manufacturing part are to ceramic substrate 76, or similar technology.Under any circumstance, the first and second arc of contact portions 84,86 and a plurality of conduction contact part 88,90 preferably all comprise the thick-film conductor material, as Dupont  7484 or 4597 materials, or similar material.Resistance trace 89,91 preferably also comprises the thick-film resistor glaze, as Dupont  2000 series, or similar material, can be used as the radially inside part of top layer deposition to the part radially outward of conduction contact part 88 and other conduction contact part 90.

Figure 4 and 5 have shown the slide 94 on the slide slide plate 96 of fuel level sensor mechanism 62.Slide slide plate 96 preferably includes any suitable non-conducting material, as acetal plastic material or any suitable polymeric material, comprises the cylinder-shaped sleeve 100 of the pivot that forms slide plate 96, and is provided with the radially relative keeping arm 102 that extends from sleeve pipe.Slide slide plate 96 also comprises arm 104, radially extends from sleeve pipe 100, by from arm 104 axially extended elasticity tips 106, connects slide plate 96 to floating arm 64.Arm 104 comprises slide keeper 108, extends with arm 104 whole formation and from middle parts transversely.Slide keeper 108 ends at the shoulder 110 of integrally formed projection.The projection shoulder 110 of slide 94 best molded insertion slide plates 96, but also can any other mode connect.

Slide 94 preferably includes stamped metal, as aldary or any other suitable conductive material, and comprises sliding wall 112 divided into two parts, and it has base portion 114, is connected to the tip that is radially spaced 116,118 of arm 112.First tip 116 is corresponding to the second arc of contact portion 86 of the variable-resistance first arc of contact portion 84, the second most advanced and sophisticated 118 corresponding variable resistance.First tip 116 is divided into first and second fingers that are radially spaced 120,122, supports first and second contact elements 124,126 respectively.Similarly, second tip is divided into two fingers that are radially spaced 130,132, and it supports first and second contact elements 134,136 respectively.Show that as Fig. 5 is clear in the assembly, the tip 116,118 of the slide 94 of cantilever can be arrived working position or height towards the direction elastic deformation of arm 104.

With reference to figure 4,5, contact element 124,126,134,136 size is best identical or similar substantially, does not line up, along the horizontal or peripheral direction biasing transverse to the direction edge of the radial line R that extends from the center C of sleeve pipe 100 substantially.It is long that first finger 120 at first tip 116 cans be compared to second finger 122 most.In this case, the staggered or lateral offset of first contact element 124 at first tip 116 and second contact element 126, first contact element 134 at second tip 118 interlocks or lateral offset with second contact element 136, for following detailed introduction purpose.

As the clear demonstration of representational first contact element 122 that passes through first tip 116 of Fig. 6, each contact element comprises original radius 140 and corner radius 142.The ratio of original radius 140 and corner radius 142 is preferably at 4: 1 the order of magnitude, but also can be some more or less.Original radius 140 wishes to contact with the conduction contact part of each arc of contact portion.Each contact element 124,126,128,130 preferably is made up of precious metal alloys or noble metal, and as gold, platinum, and/or metalloid also can comprise any suitable conductive material.Contact element 124,126,128 and 130 preferably are welded or brazed onto arm 112.But any suitable connected mode also can consider, so that each web member is fixed firmly to arm 112, and provides good electrical conductivity.

Fig. 7 has shown the slide 294 of prior art, comprises travelling arm 312 divided into two parts, and it has isolated most advanced and sophisticated 316,318 base portion 314 of arm portions 312.First tip 316 is divided into two spaced apart fingers 320,322, and it supports first and second contact elements 324,326 respectively.Similarly, second tip 318 is divided into two spaced apart fingers 330,332, and it supports first and second contact elements 334,336 respectively.Noticing that the size of all contact elements 324,326,334,336 is identical or similar substantially, and alignment, is not staggered or lateral offset.

Fig. 8 has shown the open circuit problem of prior art.As shown in the figure, the contact surfaces district of two contact elements 324,326 or " impression " comprise in the arc of contact portion 284 of adjacent conductive contact portion 288 stacked.Contact element 324,326 aligns along radius or radial line 283`, between adjacent part 288, rather than overlapping adjacent part 288.Therefore, as shown in the figure, in the middle of contact element 324,326 was positioned at, one or more gaps were present between contact element 324,326 and the part 288, disengaged with adjacent part 288 at once.In other words, most advanced and sophisticated 316 broke away from part 288 electricity of arc of contact portion 284 at least at that time, so variable resistor opens a way at once or disconnect, and caused voltage peak value to occur.Identical problem occurs in the contact element 334,336 and the finger 330,332 at other tip 318 shown in Figure 7 equally.

Move to corner radius at contact element 324,326, rather than keep in touch under the situation between the part of original radius and arc of contact portion, the open circuit problem is outstanding especially, therefore causes the contact region that contacts with each arc of contact portion less.This way to solve the problem is the size that increases contact element 324,326 simply, prevents that contact element 324,326 from falling between the adjacent part.But because contact element comprises more expensive noble metal relatively, this method cost is higher, therefore is difficult to adopt.

Fig. 9 has shown surface in contact district or " impression " that is stacked in two contact elements 124,126 in the arc of contact portion 84 that comprises adjacent conductive contact portion 88.According to this exemplary embodiment, wish the setting of contact element 124,26 at tip 116, make contact element 124,126 always contact with two adjacent parts 88 of arc of contact portion 84.In other words, at any time, at least one contacts with first in two adjacent parts 88 in the contact element 124,126; Another second portion with two adjacent parts 88 at least in the contact element 124,126 contacts, wherein disconnect with the contacting of second contact portion before, contact element 124,126 contacts first contact portions jointly.Therefore, most advanced and sophisticated 116 always contact with at least one part 88 of arc of contact portion 84, and same mode is applied to the contact element 134,136 and the finger 130,132 at another tip 118, therefore can prevent that open-circuit condition from appearring in variable resistor.As shown in the figure, contact element 124, the 126 relative imagination straight line 83` that radially extend between adjacent part 88 are with square setting.

Figure 10 has shown other selectable slide 494, and it is designed to prevent that contact element from falling between the adjacent slide part, and allows to use less and cheap contact element.Slide 494 comprises two travelling arms 512, has isolated most advanced and sophisticated 516,518 the base portion 514 that is connected to arm 512.First tip 516 is divided into the spaced apart fingers 520,522 of two inclinations, and it supports first and second contact elements 524,526 respectively.Similarly, second tip 518 is divided into the spaced apart fingers 530,532 of two inclinations, and it supports first and second contact elements 534,536 respectively.

Finger 520,522,530, the 532 best relative axis L of one or more horizontal expansions of slide 494, the L` bending is approximately the angle A of 13 degree.But the angle between also flexible 10 to 15 degree in finger, or the angle between 5 to 30, or any suitable angle.Perhaps, can imagine, just contact element 524,526,534,536th tilts, finger 520,522, and 530,532 can be straight line, but size is bigger, to hold the contact element of inclination.Notice, all contact elements 524,526,534,536th, identical, or size is similar substantially, and basic alignment, not staggered or lateral offset setting.

Figure 11 has shown surface in contact district or " impression " that is stacked in two contact elements 524,526 in the arc of contact portion 84 that comprises adjacent conductive contact portion 88.According to this exemplary embodiment, wish that contact element 524,526 tilts, make the bight at least relatively of contact element 524,526 contact with two adjacent parts 88 of arc of contact portion 84.In other words, at any time, in the contact element 524,526 at least one with two adjacent parts 88 in one contact.Therefore, most advanced and sophisticated 516 always contact with at least one part 88 of arc of contact portion 84.Same mode is applied to the contact element 534,536 and the finger 530,532 at another tip 518.As shown in the figure, contact element 524,526 is arranged to or in the position that the imagination straight line 83` that relatively radially extends between adjacent part 88 tilts, rather than is arranged to square.Therefore, the conduction contact part 88 of the radially location of the relative variable resistor card 74 of finger and/or contact element tilts.

Figure 12 has shown other selectable slide 694, and it is designed to prevent that contact element from falling between the adjacent slide part, allows to use less and more cheap contact element.Slide 694 comprises two travelling arms 712, and it is provided with base portion 714, two isolated most advanced and sophisticated 716,718 of arm portions 712.First tip 716 is divided into the staggered and spaced apart fingers 720,722 of two inclinations, and it supports first and second contact elements 724,726 respectively.Similarly, second tip 718 is divided into the spaced apart fingers 730,732 of two inclinations, and it supports first and second contact elements 734,736.

Finger 720,722,730, the 732 best relative axis L of one or more horizontal expansions of slide 694, the L` bending is approximately the angle A of 13 degree.But the angle between also flexible 10 to 15 degree in finger, or the angle between 5 to 30 degree, or any suitable angle.Perhaps, can imagine, just contact element 724,726,734,736th tilts, finger 720,722, and 730,732 can be straight line, but size is bigger, to hold the contact element of inclination.

In addition, contact element 724,726,734,736 is preferably identical, or size is similarly basically, do not line up, but horizontal or circumferential biasing, similar setting shown in Figure 4.It is long that first finger 720 at first tip 716 cans be compared to second finger 722 most.In this case, first contact element 724 at first tip 716 is and second contact element, 726 staggered or lateral offset first contact element 734 at second tip 718 and second contact element, 736 staggered or lateral offset.

Figure 13 has shown surface in contact district or " impression " that is stacked in two contact elements 724,726 in the arc of contact portion 84 that comprises adjacent conductive contact portion 88.According to this exemplary embodiment, wish contact element 524,526 inclinations and staggered, make the bight at least relatively of contact element 724,726 contact with two adjacent parts 88 of arc of contact portion 84.In other words, at any time, in the contact element 724,726 at least one with two adjacent parts 88 in one contact.Therefore, most advanced and sophisticated 716 always contact with at least one part 88 of arc of contact portion 84.Same mode is applied to the contact element 734,736 and the finger 730,732 at other tip 718.

Be preferred embodiment at present although the present invention who introduces above has, other embodiment also can adopt.This illustrates that not mentioned institute of the present invention might equivalents or extension form.Should know that used term just is used for introducing in the literary composition, rather than be used for limiting that under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes, the present invention is limited by claims.

Claims (23)

1. the variable-resistance slide of a fuel level sensor, variable resistor has the isolated conduction contact part that is disposed radially, and described slide comprises:

Arm;

At least two contact elements that are supported on described arm, at least one contact element lateral offset are in another, or variable-resistance relatively conduction contact part forms an angle.

2. slide according to claim 1 is characterized in that described arm is a cantilever, is divided into two isolated tips.

3. slide according to claim 2 is characterized in that, described isolated tip forms two spaced apart fingers respectively, and it supports a contact element respectively.

4. slide according to claim 3 is characterized in that described spaced apart fingers has different length.

5. slide according to claim 3 is characterized in that, described spaced apart fingers comprises the sloping portion that the axis of described relatively at least one horizontal expansion of arm forms.

6. slide according to claim 1 is characterized in that, at least one horizontal expansion axis of the described relatively arm of described contact element forms the angle between 10 to 15 degree.

7. slide according to claim 1 is characterized in that, the mutual lateral offset of described at least two contact elements, and conduction contact part forms an angle relatively.

8. the variable resistor of a fuel level sensor comprises:

Resistance area, it comprises conduction contact part, it is disposed radially and apart from one another by opening; With

Slide comprises arm and at least two contact elements that are supported on described arm, and at least two contact elements are arranged on arm, makes at least two contact elements always keep in touch at least two adjacent parts of conduction contact part.

9. variable resistor according to claim 8 is characterized in that, described at least one lateral offset of at least two contact elements is in another, and conduction contact part forms an angle relatively.

10. variable resistor according to claim 9 is characterized in that, the relative conduction contact part of described at least two contact elements forms an angle, and the size of at least one direction is less than the gap between the conduction contact part.

11. variable resistor according to claim 8 is characterized in that, the arm of described slide is a cantilever, is divided into two isolated tips.

12. variable resistor according to claim 11 is characterized in that, described isolated tip forms two spaced apart fingers respectively, and it supports a contact element respectively.

13. variable resistor according to claim 11 is characterized in that, the part of at least one horizontal expansion axis tilt of described each spaced apart fingers formation and arm.

14. variable resistor according to claim 13 is characterized in that, the relative conduction contact part of described at least two contact elements forms the angle between 5 to 45 degree.

15. variable resistor according to claim 8 is characterized in that, the mutual lateral offset of described at least two contact elements forms an angle with conduction contact part.

16. a variable resistor fuel level sensor comprises floating arm mechanism, described floating arm mechanism comprises:

Matrix;

Float;

Floating arm has floating end that supports float and the matrix end that pivotally is supported on matrix;

The variable resistor card is supported on the matrix of floating arm mechanism, and it comprises:

Substrate comprises the stupalith to small part;

The arc resistance area is arranged on the substrate, comprises conduction contact part, and it is disposed radially and the basic spacing that equates arranged; With

Slide, comprise arm and at least two contact elements that are supported on arm, described at least two contact elements are arranged on arm, make that at least two contact elements always keep contacting with at least two adjacent parts of resistance area, whenever, at least one contact element keeps in touch the part at least two adjacent parts, at least one other contact element contacts with another part at least two adjacent parts, in addition, with second contact portion disconnect contact before, at least two contact elements always keep and the contacting of first contact portion.

17. fuel level sensor according to claim 16 is characterized in that, at least one relative another lateral offset in described at least two contact elements, or conduction contact part forms an angle relatively.

18. fuel level sensor according to claim 17 is characterized in that, the relative conduction contact part of described at least two contact elements forms an angle, and the size of at least one direction is less than the gap between the conduction contact part.

19. fuel level sensor according to claim 16 is characterized in that, the arm of described slide is a cantilever, and is divided into two isolated tips.

20. fuel level sensor according to claim 19 is characterized in that, described isolated tip is divided into two spaced apart fingers separately, contact element of each finger supporting.

21. fuel level sensor according to claim 19 is characterized in that, described each spaced apart fingers forms the part of axis tilt of at least one horizontal expansion of relative arm.

22. fuel level sensor according to claim 21 is characterized in that, the relative conduction contact part of described at least two contact elements forms the angle between 5 to 45 degree.

23. fuel level sensor according to claim 16 is characterized in that, the mutual lateral offset of described at least two contact elements, and conduction contact part forms an angle relatively.

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