CN101903756A - 用于机动车油箱的液位传感器的油箱传感器电路板 - Google Patents

用于机动车油箱的液位传感器的油箱传感器电路板 Download PDF

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CN101903756A
CN101903756A CN2008801214104A CN200880121410A CN101903756A CN 101903756 A CN101903756 A CN 101903756A CN 2008801214104 A CN2008801214104 A CN 2008801214104A CN 200880121410 A CN200880121410 A CN 200880121410A CN 101903756 A CN101903756 A CN 101903756A
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circuit board
sensor circuit
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tank sensor
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埃里希·马特曼
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Continental Automotive GmbH
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    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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    • G01F23/363—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 using electromechanically actuated indicating means
    • 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
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    • 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
    • G01F23/38—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 magnetically actuated indicating means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/32—Adjustable resistors the contact sliding along resistive element the contact moving in an arcuate path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/02—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by movement of a float carrying a magnet
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    • B60—VEHICLES IN GENERAL
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    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
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Abstract

本发明涉及一种用于机动车油箱的液位传感器的油箱传感器电路板，其具有支承件(1)，在其上以厚膜技术涂覆有含银的接触面(18，24)。接触面(18，24)包括：银层(2，5)；和完全或部分地覆盖银层(2，5)的、含镍、钯和金的覆盖层(7，8)。

Description

用于机动车油箱的液位传感器的油箱传感器电路板
技术领域
本发明涉及一种用于机动车油箱的液位传感器的油箱传感器电路板，该电路板具有支承件，在其上以厚膜技术涂覆有含银的接触面。
背景技术
在这种类型的油箱传感器电路板中已知的是，接触面由银-钯或还有由银-钯-金制成。这种材料应该有利于接触面的耐油性和耐磨性。
由于贵金属金和钯的原因，这种以厚膜技术涂覆的、层厚度大约为15μm的接触面是非常昂贵的。
发明内容
因此，本发明的目的在于提出一种开头所述类型的油箱传感器电路板，其接触面不仅是价格低廉的而且还是耐油的和耐磨的。
该目的根据本发明由此实现，即接触面包括：涂覆在支承件的第一表面上的银层或含银层；和完全或部分地覆盖含银层或银层的、含镍、钯和金的覆盖层。
此外，银层或含银层用于实现良好的导电性能，但其不是耐油的和耐磨的。
因为只在接触面的暴露的表面上要求耐油性和耐磨性，所以银层或含银层只要具有这种性能的覆盖层就足够了。
此外，散布到金中的钯用于覆盖面的固定的进而耐磨的结构，同时，镍使接触面具有良好的可焊性。
这种结构获得了量级为50％的价格优势。
此外，覆盖层可以由镍、钯和金构成的分隔的多个层构成，其中优选地，银层或含银层被第一钯层覆盖，第一钯层被镍层覆盖，以及镍层被金层覆盖。
作为最上层的金层用于与可放置在接触面上的接触件进行良好接触。
为了进一步提高金层的耐磨性，镍层可以由支撑金层的第二钯层覆盖。
由于银层或含银层的厚度是覆盖层的厚度的多倍，所以由于覆盖层的厚度很小，仅需要少量的其昂贵的材料。
银层或含银层的厚度可以是覆盖层的厚度的20至40倍，其中，该厚度优选地是覆盖层的厚度的25至35倍，特别是30倍。
银层或含银层的厚度可以是10μm至200μm，特别是15μm，第一钯层的厚度是0.001μm至0.02μm，特别是0.01μm，镍层的厚度是3μm至7μm，特别是5μm，第二钯层的厚度是0.1μm至0.7μm，特别是0.5μm，以及金层的厚度是0.05μm至0.14μm，特别是0.12μm。
为了实现耐油性，支承件优选地由陶瓷制成。
为了充分利用存在的表面并进而减小所需的结构空间，在支承件的第二表面上涂覆可以第二接触面，其中，第一和第二接触面可以彼此导电连接。
在一个简单的实施例中，第一和第二接触面可以借助支承件中的金属化通孔(Durchkontaktierung)彼此导电连接，该金属化通孔包括穿过支承件的、气密地封闭的并且在其壁上金属化的或完全由金属填充物填充的通道开口。
当金属化或金属填充物的材料与接触面的材料相同时，由此简化了制造过程。
为了在涂覆覆盖层时使得接触面的不需要涂层的区域不被覆盖层覆盖，可以用保护层覆盖住银层或含银层的不被覆盖层覆盖的区域。
此外，该保护层在简单的方式中是玻璃层。
为了产生电阻网络，可以在支承件上与接触面相邻地以厚膜技术涂覆有一个或多个电阻层，这些电阻层为了实现当涂覆覆盖层时不被覆盖层覆盖而可以被保护层覆盖。
可以由此实现接触面的接触，即，可取决于机动车油箱的液位摆动的滑动件可在接触面的形成滑动轨道的覆盖层上抵靠性地移动，从而构成电位计。
在另一个实施例中，多个构成一个接触轨道的接触件中的一个可取决于机动车油箱的液位偏转，以抵靠在接触面的覆盖层上。
如果滑动件或接触件至少部分由金制成，则这因此实现了良好且可靠的接触。
附图说明
本发明的实施例在附图中示出并在下面详细加以说明。图中示出：
图1是油箱传感器电路板的横截面图；
图2是图1所示油箱传感器电路板的、涂覆在支承件上的两个接触面的放大的原理图；
图3是油箱传感器的分解视图；
图4是图3所示油箱传感器沿着线Ⅲ-Ⅲ的截面图。
具体实施方式
图1和2所示的油箱传感器电路板具有板状的、由陶瓷制成的支承件1，在其第一表面3上涂覆有接触面18，该接触面具有厚度为15μm的第一银层2。
在银层2的空出的区域中，在支承件1的第一表面3上涂覆有电阻层15。
在支承件1的与第一表面3平行的第二表面4上涂覆有大约在第一银层2对面设置的、厚度与其相同的第二银层5。
在第一银层2和第二银层5之间，在支承件1中设有通道开口6，其壁用银进行了金属化，从而在第一银层2和第二银层5之间形成了金属化通孔。
通道开口6的端部由第一银层2和第二银层5气密地封闭。
在支承件1上涂覆了银层2和5后，又涂覆并熔融了玻璃粉，从而利用玻璃层9和10覆盖住不被以后不需要涂覆在银层2和5上的覆盖层7和8所覆盖的区域以及电阻层15。
当随后将覆盖层7和8涂覆在银层2和5上时，该玻璃层9和10确保不需要被覆盖的区域不被覆盖层7和8覆盖。
如图2所示，覆盖层7和8包括首先涂覆在银层2和5上的厚度为0.01μm的第一钯层11。
在其上以厚膜技术涂覆有厚度为5μm的镍层12，又在镍层上涂覆有厚度为0.5μm的第二钯层13，以及最后在第二钯层上又涂覆有厚度为0.12μm的金层14。
在图3和4中所示的磁性的位置传感器以拱形的电位计的形式示出。
此外，支承件1支撑了轨道形状的电阻层15形式的电阻网络，该电阻网络在电接口16和17之间延伸。
从电阻层15大约径向出发地并且与其导电连接的多个接触面18彼此间隔开地布置在支承件1上。
在电阻层15上布置有与电阻层覆盖面大概一致的分隔层19，在其上布置有软磁的、单体的和梳状的弯条结构20。
弯条结构20包括在一侧支撑在电阻层15的区域中的、可自由移动的弯条21，这些弯条构成了涂覆金的接触件。
分隔层19将弯条结构20的可自由移动的端部保持为与接触面18相隔规定的间距，其中，弯条21的可自由移动的端部覆盖在接触面18上。
导电的弯条结构20与外部的电接口22连接。
电阻层15通过接口16和17与地面和工作电压电连接。
位置传感器的信号电压可通过电接口22获取。
信号电压可在从0V直至工作电压的范围内变动并代表了永磁体23的位置，该永磁体例如可取决于机动车油箱中的液位传感器的浮标移动。
永磁体23可在支承件1的、背对于支撑接触面18的侧面的侧面上沿着弯条结构20移动并且分别将与其相对设置的弯条21吸引到接触面18上。
由此，对应于永磁体23的位置，产生了到电阻层15的相应位置的电连接，并获取与该位置相应的信号电压并且将该信号电压输送至未示出的显示单元。
布置在支承件1上的接触面、电阻层和分隔层由布置在支承件1上的壳体覆盖。

Claims (25)

1.一种用于机动车油箱的液位传感器的油箱传感器电路板，所述油箱传感器电路板具有支承件，在所述支承件上以厚膜技术涂覆有含银的接触面，其特征在于，所述接触面(18)包括：涂覆在所述支承件(1)的第一表面(3)上的银层(2)或含银层；和完全或部分地覆盖所述含银层(2，5)或所述银层的、含镍、钯和金的覆盖层(7，8)。
2.根据权利要求2所述的油箱传感器电路板，其特征在于，所述覆盖层(7，8)由镍、钯和金构成的分隔的多个层构成。
3.根据权利要求2所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层被第一钯层(11)覆盖，所述第一钯层(11)被镍层(12)覆盖，以及所述镍层(12)被金层(14)覆盖。
4.根据权利要求3所述的油箱传感器电路板，其特征在于，所述镍层(12)由支撑所述金层(14)的第二钯层(13)覆盖。
5.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层的厚度是所述覆盖层(7，8)的厚度的多倍。
6.根据权利要求5所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层的厚度是所述覆盖层(7，8)的厚度的20至40倍。
7.根据权利要求5所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层的厚度是所述覆盖层(7，8)的厚度的25至35倍，特别是30倍。
8.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层的厚度是10μm至200μm，特别是15μm。
9.根据权利要求3至8中任一项所述的油箱传感器电路板，其特征在于，所述第一钯层(11)具有0.001μm至0.02μm，特别是0.01μm的厚度。
10.根据权利要求3至9中任一项所述的油箱传感器电路板，其特征在于，所述镍层(12)具有3μm至7μm，特别是5μm的厚度。
11.根据权利要求3至10中任一项所述的油箱传感器电路板，其特征在于，所述第二钯层(13)具有0.1μm至0.7μm，特别是0.5μm的厚度。
12.根据权利要求3至11中任一项所述的油箱传感器电路板，其特征在于，所述金层(14)具有0.05μm至0.14μm，特别是0.12μm的厚度。
13.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，所述支承件(1)由陶瓷制成。
14.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，在所述支承件(1)的第二表面(4)上涂覆第二接触面(24)。
15.根据权利要求14所述的油箱传感器电路板，其特征在于，所述第一和第二接触面(18，24)彼此导电连接。
16.根据权利要求15所述的油箱传感器电路板，其特征在于，所述第一和第二接触面(18，24)借助所述支承件(1)中的金属化通孔彼此导电连接。
17.根据权利要求16所述的油箱传感器电路板，其特征在于，所述金属化通孔包括穿出所述支承件(1)的、气密地封闭的并且在其壁上金属化的或完全由金属填充物填充的通道开口(6)。
18.根据权利要求17所述的油箱传感器电路板，其特征在于，所述金属化或所述金属填充物的材料与所述接触面(18，24)的材料相同。
19.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，所述银层(2，5)或所述含银层的不被所述覆盖层(7，8)覆盖的区域被保护层覆盖。
20.根据权利要求19所述的油箱传感器电路板，其特征在于，所述保护层是玻璃层(9，10)。
21.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，在所述支承件(1)上与所述接触面(18)相邻地以厚膜技术涂覆有一个或多个电阻层(15)。
22.根据权利要求21所述的油箱传感器电路板，其特征在于，所述电阻层(15)由所述保护层覆盖。
23.根据前述权利要求中任一项所述的油箱传感器电路板，其特征在于，可取决于所述机动车油箱的液位摆动的滑动件可在所述接触面的形成滑动轨道的所述覆盖层上抵靠性地移动。
24.根据权利要求1至22中任一项所述的油箱传感器电路板，其特征在于，多个形成一个接触轨道的接触件中的一个可取决于所述机动车油箱的所述液位偏转，以抵靠在所述接触面(18)的所述覆盖层(7)上。
25.根据权利要求23和24中任一项所述的油箱传感器电路板，其特征在于，所述滑动件或所述接触件至少部分地由金制成。
CN2008801214104A 2007-12-19 2008-12-04 用于机动车油箱的液位传感器的油箱传感器电路板 Pending CN101903756A (zh)

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