CN105889328B - 电绝缘轴承 - Google Patents
电绝缘轴承 Download PDFInfo
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- CN105889328B CN105889328B CN201610149841.8A CN201610149841A CN105889328B CN 105889328 B CN105889328 B CN 105889328B CN 201610149841 A CN201610149841 A CN 201610149841A CN 105889328 B CN105889328 B CN 105889328B
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- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 42
- 229920003987 resole Polymers 0.000 claims abstract description 24
- 239000011148 porous material Substances 0.000 claims abstract description 17
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims description 36
- 239000011248 coating agent Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 30
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- 239000000758 substrate Substances 0.000 claims description 17
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 229920001568 phenolic resin Polymers 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000005011 phenolic resin Substances 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
一种具有由陶瓷组成的表面的轴承组件,其中该陶瓷具有多个孔,并且其中至少一些孔至少部分用包括甲阶酚醛树脂的树脂填充。
Description
技术领域
本发明涉及轴承领域。更具体地说,本发明涉及一种新的用于轴承组件的电绝缘层,并且涉及包括所述组件的轴承。
背景技术
轴承是允许两个部件之间相对运动的装置。滚动元件轴承典型地包括内外滚道和布置在其间的多个元件(例如,诸如滚珠或辊子之类的滚动元件)。为了长期的可靠性,重要的是,各个元件具有高耐滚动接触疲劳性、耐磨损性和耐蠕动性。出于这些理由,轴承钢材是大多数轴承组件的精选材料。
电动机、发电机和关联装置在电流通过轴承时是冒着风险的。这可损伤轴承中滚动元件和滚道的接触表面(电蚀)并迅速降解润滑油脂。电动机和发电机的另一风险来自于由于固有的杂散电容(stray capacitance)造成的高频电流。如果应用采用了变频器,则损伤的风险增大。
转轴中的电流或者是故意创建的,或者是由于感应旋转机械中的不平衡而产生的。在任一情况下,通常期望通过绝缘轴承将两个组件彼此绝缘。旋转感应机械中轴电流的问题几十年来一直被视为限制轴承寿命的实质因素。
壳体、外圈、滚动元件、内圈和轴之间的接触区域用作电接触头。通过轴承的电流造成在相对短的时段内它们有用寿命的重大衰退。例如,电流通过将损伤轴承圈的滚道和滚动元件,并迅速降解润滑油。典型的损伤特征在于坑(crater)和摩擦腐蚀压痕(falsebrinelling)。
有几种已知的方法消除通过轴承的电流。陶瓷滚动元件已被考虑用于轴承应用。然而,已认识到陶瓷滚动元件用于安全关键应用存在相关联的内在局限性。
一种使轴承更不导电的方法是改变轴承组件的块体材料(bulk material),以便耐电流。这受限于轴承应用和制造的机械和成本要求。替代地,可以用电阻材料涂覆轴承组件,这更经济有效。然而,这样的涂层必须具有足够的硬度。
GB 1591560公开了一种由在轴承内孔中布置由轴承支撑的机器,其中轴承内孔通过氧化铝层绝缘。
US4320931公开了一种绝缘轴承,其中所述轴承包括轴承壳和内轴承材料(巴氏合金)。基层施加在壳上(优选采用等离子喷涂方法),较厚的陶瓷绝缘材料层布置在基层之上,最后增加“粘附”层(优选金属材料)以用作壳与轴承材料(巴氏合金)最终层之间的粘合剂。
使壳体或轴绝缘通常是昂贵且耗时的。US 3924906教导了一种用于使轴承绝缘的替代方法。其公开了电绝缘轴承,包括轻金属氧化物或陶瓷的绝缘涂层。该绝缘涂层通过等离子涂层或火焰喷涂施加在壳体或轴承的非旋转表面上。绝缘涂层接着用清漆涂覆,以注入(impregnate)该绝缘并防止污染。EP 1408249公开了一种类似的方法,没用清漆,其中轴承组件的表面也包括基准面(tool reference plane),可用于一种润饰(finish)电绝缘层的工艺,或者可用于绝缘层的厚度控制。
本发明的目的是提供一种绝缘轴承,其可利用标准的方法和工具来安装,并且即使长期在高度潮湿的环境中也能保持其电性能。
因此,本发明目标是至少解决与现有技术相关联的一些问题,或者至少提供一种可商用的替代方案。
发明内容
在第一方面,本发明提供了一种轴承组件,具有包括陶瓷的表面,其中陶瓷具有多个孔,并且其中至少一些孔至少部分用包括甲阶酚醛树脂的树脂填充。
现在将进一步描述本发明。在下面的几段中,将更详细地限定本发明的不同方面。这样定义的每个方面可与任意方面结合,除非有明确的相反指示。特别是,指示为优选或有优势的任何特征可与指示为优选或有优势的任何其它特征相结合。
如上面提到的,轴承是允许两个部件之间相对运动的装置。滚动元件轴承典型地包括内外滚道,在其间布置多个滚动元件。滚动元件的实施例包括滚珠、辊子和圆锥辊。
轴承内使用的组件具有磨损和非磨损表面。磨损表面是使用时与相对于该表面运动的另一表面接触的表面。例如,滚珠滚动元件的整个外表面可视为磨损表面,尽管仅用于接触滚珠滚动元件的滚道的内表面构成磨损表面。正如要认识到,使用时,在磨损表面之间存在油脂或油类或其它工作流体。
优选地,轴承组件是内或外滚道。这样的组件在现有技术中是众所周知的。
为了长期的可靠性,重要的是,轴承的各个组件具有高耐滚动接触疲劳性、耐磨损性和耐蠕动性。为了满足这些需求,轴承组件一般来说由金属制成,特别是钢,以及更优选的是轴承钢材。这些材料在现有技术中是众所周知的,易于导电,因此轴承易受电流流动的影响。
用于这样的轴承组件的表面涂层在现有技术中也是已知的。例如,SKF 采用了表面涂层,这使得轴承耐电。尤其是,轴承设计成防止电流通过轴承。与其它绝缘方法相比较,轴承是一种经济有效的解决方案。通过将绝缘属性结合到轴承中,轴承改善了可靠性并通过解决电蚀问题,提高了机器正常运行时间。更详细地,轴承具有其利用例如氧化铝经等离子喷涂形成涂层的内外圈的外表面。所述涂层用丙基酸酯组合物密封以免于水和湿气的传导影响。
发明人现在已发现,可通过提供树脂注入多孔渗水陶瓷的孔中,典型地陶瓷表面涂层,来减轻长期曝露在潮湿中带来的问题,其中所述树脂包括甲阶酚醛树脂(resolephenolic resin)。尤其是,本发明的涂层通过使用涂层解决了潮湿带来的问题,其中陶瓷的孔至少部分用甲阶酚醛树脂填充。这种帮助使得涂层不受水的影响,因而其保持了耐电性。
陶瓷的表面可以是磨损表面和/或非磨损表面。然而,该表面一般是非磨损表面。
轴承组件例如是内或外滚道。
甲阶酚醛树脂是苯酚甲醛树脂,其甲醛对苯酚的比率(摩尔)大于1。在不希望受理论约束的情况下,甲阶酚醛树脂一般是高度交联的(cross-linked),这使它们硬度高、热稳定性和化学不透性(chemical imperviousness)良好。由于这些属性,也由于已发现易于注入多孔渗水陶瓷涂层,尤其是诸如氧化铝之类的金属氧化物,因此采用甲阶酚醛树脂是尤其有用的。通过将甲阶酚醛树脂溶解在一种或多种有机溶剂中,可有利地便于甲阶酚醛树脂的应用以及将其注入多孔渗水陶瓷。
本发明中采用的酚醛树脂是甲阶酚醛树脂,而不是线性(novalac)酚醛树脂。已发现线性酚醛树脂是难于应用于由诸如氧化铝之类的多孔渗水陶瓷部分组成的轴承组件中的。而且,已发现潮湿环境中的长期性能要劣于甲阶酚醛树脂。
另外,已发现甲阶酚醛树脂可改善外观,并减少了在注入步骤之后留在涂层的表面上的过多的树脂数量。
甲阶酚醛树脂中的苯酚对甲醛的比率(摩尔)优选在5∶1到3∶1的范围内,更优选的是大约4∶1。
优选地,表面涂层设置在轴承组件的非磨损表面上。非磨损表面例如是外轴承圈的外表面、内轴承圈的内表面、外圈的侧表面(即,与轴承的轴基本垂直的表面)或者内圈的侧表面中的一个或多个。
优选地,表面涂层基本覆盖组件的所有非磨损表面。诸如本发明的那些绝缘涂层优选在整个表面连续被涂覆,以便保持轴承的耐电性。因此,优选涂覆轴承组件的非磨损表面,因为磨损表面上的涂层可能被磨损到他们丧失其耐电属性这种程度。
在根据本发明的轴承组件中,陶瓷典型地设置为金属或合金基板上的表面涂层,优选钢基板,例如轴承钢基板。
优选地,表面涂层厚度为0.04-1mm,优选0.1-0.5mm。这优选为平均厚度。当表面涂层比这薄时,其耐电性不如其高也不如其可靠。当表面涂层比这厚时,它们需要另外的机器加工步骤。
该陶瓷包括例如金属氧化物,优选氧化铝。这样的材料在现有技术中是常规的并且本来就是多孔渗水的。金属氧化物是足够耐用的,紧密粘附至块体轴承组件材料(例如,轴承钢),可利用常规方法沉积在组件的表面之上。金属氧化物亦显示了极高的耐电性。氧化铝是有优势的,因为其易于通过常规喷涂涂覆施加以形成均匀厚度的涂层。根据提到的,该涂层本质上是多孔渗水的,且易于用本发明使用的树脂注入。
根据另一方面,提供了一种包括这里所述组件的轴承。该轴承主要用作(电)绝缘轴承。
根据另一方面,提供了一种工艺,用于制造本文所描述的轴承组件,该工艺包括:
提供轴承组件,其包括金属或合金基板,优选钢基板;
在基板表面形成陶瓷层,其中该陶瓷层在其外表面具有多个孔;
用包括甲阶酚醛树脂的树脂注入陶瓷层,其中陶瓷层中的孔中的至少一些至少部分用树脂填充;和
固化该树脂。
在注入步骤期间,树脂进入并至少部分地填充陶瓷层中的一些或全部的孔。用于实现注入的方法包括基于溶剂的注入、通过旋转方法的浸渍注入和真空压力注入(vacuumpressure impregnation)。这样的方法在现有技术中是已知的。
固化步骤是常规的且可通过例如施加热和/或光来实现。
树脂优选通过热固化工艺来固化,典型地在烤箱中固化,优选在空气中。树脂优选以100-200℃的温度固化。固化时间优选5分钟到12小时。固化理想上在空气中实施。
树脂粘性影响注入度、注入工艺的速度、表面外观和在注入工艺后留在表面上的过量树脂的数量。
优选地,上一方面的工艺用于形成如本文所述的轴承。
优选地,在至少一个表面上形成层的步骤包括:(a)等离子喷涂;(b)悬浮液喷涂;(c)高速氧燃料喷涂;和/或(d)火焰喷涂。这样的技术在现有技术中是已知的。
优选地,该工艺还包括润饰步骤,移除陶瓷层上剩余的树脂的至少一部分,和/或移除陶瓷层注入有树脂的至少一部分。优选地,该轴承组件通过碾磨、抛光或变成所需尺寸进行机器加工。
优选地,注入所述层的步骤中使用的树脂被预先溶解在一种或多种有机溶剂中。该有机溶剂优选包括乙醇和/或甲醇。在使用甲醇和乙醇混合物的地方,乙醇中甲醇的浓度是1-99wt.%,更优选3-7wt.%(即,优选97-93wt.%乙醇)。树脂的解决方案优选包括基于树脂和溶剂的总重量,10-90wt.%的溶剂,更优选25-75wt.%溶剂。将树脂溶解在这样的溶剂中可降低粘性,而且提高了树脂的保存期限,从而改善了外观和减少了注入步骤之后留在涂层表面上的过多树脂的数量。此外,溶剂亦分解(break down)密封剂的分子尺寸从而改善小孔的缝隙填充能力是可能的。
优选地,涂层在空气中用树脂注入。
根据另一方面,提供了一种用于从一个或多个轴承组件中形成轴承的工艺,轴承组件至少其中之一是根据本文所述的工艺制造的。即,根据本文描述的工艺,还有一个步骤,包括:形成包含该轴承组件的轴承。
附图说明
现在参照下列非限制性附图,通过示例方式进一步描述本发明,其中:
图1示出了根据本发明的轴承。
图2示出了根据本发明的工艺的流程图。
具体实施方式
图1示出了根据本发明轴承的实施例。轴承1包括具有凹槽(未示出)的内滚道5,和具有凹槽(未示出)的外滚道10。多个轴承滚珠15设置在内滚道5和外滚道10之间,从而使得轴承滚珠15安装在各个凹槽内。
内外滚道5、10设置有在使用时接触轴承滚珠15的磨损表面20,以及不接触轴承滚珠15的非磨损表面25。非磨损表面25至少部分用于将轴承1连接至使用了所述轴承1的设备。
非磨损表面25在整个非磨损表面上设置有多孔渗水陶瓷表面涂层。优选地,这大约0.5mm厚。该涂层用甲阶酚醛树脂注入。
参照图2,流程图描述了一种根据本发明用于制造具有表面涂层的轴承组件的通用工艺。尤其是,该工艺步骤包括:(i)提供轴承组件,其包括金属或合金基板,优选钢基板;(ii)在该基板的表面上形成陶瓷层,其中该陶瓷层在其外表面包括多个孔;(iii)用包括甲阶酚醛树脂的树脂注入陶瓷层,其中陶瓷层中的至少一些孔至少部分用树脂填充;和(iv)固化该树脂。所述固化理想地在空气中实施。
本发明现在参照下列的非限制性实施例进行描述。
实施例1
将溶解在乙醇-甲醇溶剂(乙醇是溶剂的主要成分)中的甲阶酚醛树脂(大约50wt.%混合物)注入等离子喷涂氧化铝涂层的孔中,然后以大约150℃在烤箱中固化大约30-60分钟时间。甲醛对苯酚的比率(摩尔)接近4∶1。
本发明人也已将甲阶酚醛树脂与用于密封具有包括(多孔渗水的)陶瓷的表面的轴承组件的其它可能候选项相比较。本发明人已发现环氧树脂易碎,并具有相对差的耐水性。聚亚安酯往往对潮湿敏感,耐热性低和使用时限短。改性的丙烯酸树脂展现了热温度强度低且是可燃的。氰基丙烯酸盐粘合剂耐热性差,耐溶剂性有限。硅元素粘性高,缝隙填充性差。聚硫化物也展现了相对较差的缝隙填充性。
在潮湿环境中耐渗水性方面,根据本发明采用用于密封具有包括(多孔渗水的)陶瓷的表面的轴承组件的甲阶酚醛树脂是有优势的。另外的益处包括缝隙填充性良好,粘性低及易于应用,能够在空气中固化,以及在固化期间收缩有限。
虽然已在本文详细描述了本发明的优选实施例,但本领域技术人员要理解,在不脱离本发明或所附权利要求的保护范围的情况下,可对其做出变化。
Claims (15)
1.一种轴承组件,具有包括陶瓷的表面,其中该陶瓷具有多个孔,并且其中至少一些孔至少部分用包括甲阶酚醛树脂的树脂来填充;
所述树脂预先溶解在一种或多种有机溶剂中;
甲阶酚醛树脂中的苯酚对甲醛的摩尔比率在5:1到3:1的范围内。
2.根据权利要求1所述的轴承组件,其中该陶瓷设置为在金属或合金基板上的表面涂层,该金属或合金基板为钢基板。
3.根据权利要求1或权利要求2所述的轴承组件,其中包括陶瓷的表面是非磨损表面。
4.根据权利要求1所述的轴承组件,其中该轴承组件是内滚道或外滚道。
5.根据权利要求2所述的轴承组件,其中该表面涂层的平均厚度为0.04-1mm。
6.根据权利要求2所述的轴承组件,其中该表面涂层的平均厚度为0.1-0.5mm。
7.根据权利要求1所述的轴承组件,其中该陶瓷包括金属氧化物。
8.根据权利要求7所述的轴承组件,其中该金属氧化物是氧化铝。
9.一种轴承,包括如权利要求1至8中任一权利要求所定义的轴承组件。
10.根据权利要求9的轴承,其是绝缘轴承。
11.一种用于制造轴承组件的工艺,该工艺包括:
提供轴承组件,该轴承组件包括金属或合金基板,该金属或合金基板是钢基板;
在该基板的表面上形成陶瓷层,其中该陶瓷层在其外表面包括多个孔;
用包括甲阶酚醛树脂的树脂注入该陶瓷层,其中该陶瓷层中的至少一些孔至少部分用树脂填充;和
固化该树脂;
注入陶瓷层的步骤中使用的树脂预先溶解在一种或多种有机溶剂中;
甲阶酚醛树脂中的苯酚对甲醛的摩尔比率在5:1到3:1的范围内。
12.根据权利要求11所述的工艺,其中在该基板的表面上形成陶瓷层的步骤包括如下的一个或多个:
(a)等离子喷涂;
(b)悬浮液喷涂;
(c)高速氧燃料喷涂;
(d)火焰喷涂。
13.根据权利要求11或权利要求12所述的工艺,其中形成该陶瓷层,其平均厚度为0.04-1mm。
14.根据权利要求11或权利要求12所述的工艺,其中形成该陶瓷层,其平均厚度为0.1-0.5mm。
15.根据权利要求11至12中任一权利要求所述的工艺,其中该工艺还包括润饰步骤,用于移除该陶瓷层上剩余的至少一部分树脂,和/或移除该陶瓷层注入有树脂的至少一部分。
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US3924906A (en) | 1973-08-01 | 1975-12-09 | Reliance Electric Co | Electrically insulated bearing and for reducing shaft current |
NL7712871A (nl) | 1977-11-22 | 1979-05-25 | Heemaf Nv | Elektrische machine. |
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JPH0668331B2 (ja) * | 1985-04-19 | 1994-08-31 | 株式会社ケーブイケー | セラミツクス質複合体からなる弁体を備えたバルブ |
JPH01240676A (ja) * | 1988-03-18 | 1989-09-26 | Hitachi Chem Co Ltd | 金属ベース基板の製造方法 |
JP3378404B2 (ja) * | 1994-05-26 | 2003-02-17 | 株式会社荏原製作所 | 摺動材料 |
JPH10259266A (ja) * | 1997-03-18 | 1998-09-29 | Riboole:Kk | 不燃性フェノール樹脂発泡体 |
JPH11147303A (ja) * | 1997-11-18 | 1999-06-02 | Ribooru:Kk | 建材用積層板 |
JP3567169B2 (ja) * | 2000-12-21 | 2004-09-22 | 独立行政法人産業技術総合研究所 | セラミックス摺動部材 |
TW541586B (en) * | 2001-05-25 | 2003-07-11 | Tokyo Electron Ltd | Substrate table, production method therefor and plasma treating device |
CN100427784C (zh) | 2002-10-08 | 2008-10-22 | Ntn株式会社 | 电蚀防止滚动轴承 |
CN1701399A (zh) * | 2003-09-30 | 2005-11-23 | 株式会社村田制作所 | 单片陶瓷电子元件和制造其的方法 |
CN1706980A (zh) * | 2004-06-11 | 2005-12-14 | 洛阳轴承集团有限公司 | 滚动轴承表面绝缘层加工工艺 |
US7572749B2 (en) * | 2004-08-31 | 2009-08-11 | Exxonmobil Research And Engineering Company | Structured bodies with siliceous binder |
DE102007047629A1 (de) * | 2007-04-13 | 2008-10-16 | Stein, Ralf | Verfahren zum Aufbringen einer hochfesten Beschichtung auf Werkstücke und/oder Werkstoffe |
JP2009210090A (ja) * | 2008-03-06 | 2009-09-17 | Nsk Ltd | 電食防止用絶縁転がり軸受及びその製造方法 |
EP2559533B1 (en) * | 2008-09-26 | 2020-04-15 | United Technologies Corporation | Casting |
RU2539246C2 (ru) * | 2010-04-27 | 2015-01-20 | 3М Инновейтив Пропертиз Компани | Керамические формованные абразивные частицы, способы их получения, и абразивные изделия, содержащие их |
JP2011117607A (ja) * | 2011-02-22 | 2011-06-16 | Ntn Corp | 電食防止型転がり軸受 |
JP5758730B2 (ja) * | 2011-07-28 | 2015-08-05 | 株式会社ダイセル | 積層セラミック製造用溶剤または溶剤組成物 |
DE102013104186A1 (de) * | 2013-04-25 | 2014-10-30 | Coatec Gmbh | Lagerring, elektrisch isolierende Beschichtung und Verfahren zum Aufbringen einer elektrisch isolierenden Beschichtung |
EP2952737B1 (en) * | 2014-06-05 | 2016-08-31 | Siemens Aktiengesellschaft | Bearing insulation |
-
2015
- 2015-02-17 GB GB1502633.9A patent/GB2535481A/en not_active Withdrawn
-
2016
- 2016-02-17 US US15/045,561 patent/US9850951B2/en active Active
- 2016-02-17 CN CN201610149841.8A patent/CN105889328B/zh active Active
- 2016-02-17 DE DE102016202399.3A patent/DE102016202399A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
GB201502633D0 (en) | 2015-04-01 |
GB2535481A (en) | 2016-08-24 |
US20160238074A1 (en) | 2016-08-18 |
US9850951B2 (en) | 2017-12-26 |
DE102016202399A1 (de) | 2016-08-18 |
CN105889328A (zh) | 2016-08-24 |
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