CN101213379B - 球节 - Google Patents

球节 Download PDF

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CN101213379B
CN101213379B CN2006800236361A CN200680023636A CN101213379B CN 101213379 B CN101213379 B CN 101213379B CN 2006800236361 A CN2006800236361 A CN 2006800236361A CN 200680023636 A CN200680023636 A CN 200680023636A CN 101213379 B CN101213379 B CN 101213379B
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bearing shell
ball
shell
joint
movable joint
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CN101213379A (zh
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H-G·布鲁尼克
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ZF Friedrichshafen AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
    • F16C11/0623—Construction or details of the socket member
    • F16C11/0628—Construction or details of the socket member with linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
    • F16C11/0623—Construction or details of the socket member
    • F16C11/0628—Construction or details of the socket member with linings
    • F16C11/0633—Construction or details of the socket member with linings the linings being made of plastics
    • F16C11/0638—Construction or details of the socket member with linings the linings being made of plastics characterised by geometrical details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/0685—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints
    • F16C11/069—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints with at least one separate part to retain the ball member in the socket; Quick-release systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/046—Brasses; Bushes; Linings divided or split, e.g. half-bearings or rolled sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/068—Special features relating to lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
    • F16C11/08—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints with resilient bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/66—Acetals, e.g. polyoxymethylene [POM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • Y10T403/32631—Universal ball and socket
    • Y10T403/32786—Divided socket-type coupling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • Y10T403/32631—Universal ball and socket
    • Y10T403/32795—Bifurcated socket
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • Y10T403/32631—Universal ball and socket
    • Y10T403/32803—Separable socket sections

Abstract

本发明涉及一种球节。本发明特别是涉及这种球节的轴瓦的专门结构。一方面，用于保证轴瓦并且因此也为了保证球节的高稳固性，并且另一方面，出于提高舒适性的目的以减小固体声。本发明提出，轴瓦构造为至少两层的，并且其中内层由金属制成，外层由塑料制成，例如聚甲醛制成，其中轴瓦的两个分别为两层或者多层的部分通过起铰链作用的接板彼此连接。

Description

球节
技术领域
本发明涉及一种球节。本发明特别是涉及一种用于降低声传播的球节的球形轴瓦或者轴瓦的专门结构。
背景技术
球节传递和承受多个方向的力。在汽车制造业中，它们例如用在转向器或者转向横拉杆上。这种类型的球节由球轴颈-也就是具有在轴向端部形成的球的销-容纳球的轴瓦以及容纳轴瓦和球轴颈部件的壳体。球轴颈的球在预紧的持续润滑的轴瓦之间滑动。轴瓦通过壳体防止潮气和脏物以及防止润滑油溢出。在所述的在汽车的使用情况中，特别是容纳球的轴瓦的内表面经受高的载荷。因此这些轴瓦通常是由金属制成。然而在现代汽车制造中，对舒适性的要求越来越高，这些要求通过具有金属的轴瓦的球节部件地不能得到满足。其缺点是，通过具有金属轴瓦的球节以不希望的程度将固体声传播到客舱或者输出到环境中。在固体声的传播方面，具有塑料轴瓦的球节具有明显的优势。这种类型的球节在采用现代塑料时在许多情况中在承载能力方面也能胜任。然而它们的缺点是，它的紧急运行特性(Notlaufeigenschaft)明显地受到限制。这就是说，当相应的球节的壳体密封出现故障或者失灵时造成脏物进入球节，或者润滑剂从原来的轴承支承架，也就是从球轴颈的球的相互滑动的表面与轴瓦的中间腔室中溢出，造成在短时间内球节全失效。
DE 10329804A1公开了一种具有非金属轴瓦的球节。在这种球节中轴瓦为双层构造。根据在该文献中所示的方案，这两个构成轴瓦的层具有不同的弹性模量，其中，离球远的外层由塑性弹性的材料构成，靠近球的内层由具有耐磨表面的材料构成。文中除了指出轴瓦是由非金属材料构成之外，并未说明两个构成了轴瓦的层的材料的具体信息。从生产技术的角度看，这个两层是由塑料构成的，然而该塑料具有不同的E模量和表面强度，因为这种由不同塑料构成的层可有利地在两级喷射工序中生产，并且彼此连接起来。其中显然满足了关于降低固体声传播的要求。对于更多应用目的，通过为内层使用相应的塑料也肯定能满足耐磨性方面的要求。然而在此方案中也存在紧急运行特性不足的问题。与金属的不同之处是，塑料和类似材料倾向于可能发生脏物，例如在球节出现不密封时在运行表面区域中出现的脏物，会在某种程度上嵌入到材料的表面上。无论如何，在这方面金属所具有的紧急运行特性是塑料几乎达不到的。
发明内容
因此本发明的任务是提供一种球节。这种球节一方面能胜任对舒适性不断提高的要求，特别是对减小固体声传播的要求，另一方面除了在将力传递到球节方面具有高的承载能力外，还具有良好的紧急运行特性。
这个任务通过一种球节得以完成。
用于完成上述任务所提出的球节以已知的方式基本上包括：一侧敞开的活节壳；活节轴颈，该活节轴颈具有在其一端形成的活节球；也一侧敞开的球形的轴瓦。活节轴颈的活节球被活节壳容纳，并且在其内表面上持续润滑的轴瓦布置在活节球和活节壳之间，由此形成了用于活节球的滑动表面。在活节球与活节轴颈的从活节壳中伸出的杆部之间的过渡区域中，活节壳通过封闭环封闭，并且通过用于避免脏物渗入和润滑剂溢出的密封膜盒(Dichtungsbalg)进行密封。轴瓦由至少两层构成，其中根据本发明，轴瓦的内层由金属构成，它的外层由塑料构成，其中轴瓦由两部分构成，轴瓦的两个分别为两层或者多层的部分通过起铰链作用的接板彼此连接。
通过这种构造，球节达到高的耐磨性，此外，这种球节由于其轴瓦的金属内表面，所以具有良好的紧急运行特性。另一方面通过轴瓦的塑料外层，相对于具有纯金属轴瓦的球节，达到明显降低了固体声的传播。另外，通过这种形式的构造简化了球节的安装，也就是简化了其部件的接合。即使在活节壳和活节球之间有很大的金属覆盖度，就像人们所希望的并在该构造形成中所实现的那样，在此活节球可简单地嵌入到轴瓦中。为此，这个轴瓦近似被掀开，在嵌入活节球后关闭。由于提高了金属覆盖度，其结果是活节轴颈具有更高的拉断强度，因此球节可以具有更高的拉力负荷。
本发明还包括一些有利的方案或改进方案。
只要根据本发明的球节的轴瓦如优选的那样由两层构成，则优选地将用于隔声的阻尼塑料外层喷射到轴瓦的金属内层上。然而也可以设想将金属内层和由塑料构成的外层通过粘接彼此连接。
优选地一侧敞开的轴瓦分成两个轴对称的半部分。根据附合实际的构造形式，这两个半部分通过两个深拉的金属半壳形成。它们在其外圆周上被塑料层覆盖，并且通过接板彼此连接。其中，在活节壳内紧挨着的半壳的边缘在轴瓦的敞开侧围成圆形的开口，而将轴瓦分开的对称轴线垂直地延伸穿过这个圆形开口的直径。
在根据本发明的球节的也是有利的改进方案中，与轴瓦的开口边缘平行地设置有在其圆周上环绕的凸缘。该凸缘挤压在封闭环和活节壳之间，通过这个凸缘，将布置在活节壳中的轴瓦固定在活节壳中，并防止转动。
优选轴瓦的金属内层在它的面朝活节球的表面上具有至少一个槽。该槽形成用于润滑剂的储存部。
为了进一步提高耐磨性，将轴瓦的金属内层的面朝活节球的表面进行镀铬，或者附加地进行淬火。对轴瓦的金属内表面进行QP处理，也就是渗氮处理也有利地导致改进耐磨性。
例如可将聚甲醛(POM)或者聚酰胺(PA)或者聚醚醚酮(PEEK)考虑用作根据本发明的方式构造的球节的轴瓦的外层塑料。
附图说明
下面借助实施例再次对本发明进行更加详细的说明。在所属的附图中示出：
图1根据本发明构造的球节的轴向半剖视图，
图2图1所示球节的轴瓦的立体图。
具体实施方式
图1示出了按照本发明构造的球节的可能构造形式的半剖视图。该球节主要由活节轴颈4、5、轴瓦1、1’、活节壳6和密封膜盒7构成。活节轴颈4、5的活节球4被一侧敝开的活节壳6容纳。在活节壳6和活节球4之间设置有也一侧敞开的、持续润滑的且球形成形的轴瓦1、1’。它的内表面形成了用于活节轴颈的活节球的滑动表面。轴瓦1、1’为两层构造。根据本发明，在这种情况中内层2由金属构成，而外层3由塑料构成。
通过轴瓦1、1’的金属内层2，保证了球节的高稳固性。此外，与其轴瓦仅由非金属材料，也就是说通常由塑料构成的球节相比，按照本发明的方式构造的球节通过其轴瓦1、1’的金属内表面具有改进的紧急运行特性。与具有塑料轴瓦的球节不同，即使偶尔出现密封膜盒的不密封，造成脏物进入到球节内或者润滑剂从其支承部位溢出，这也不会导致球节很快遭到损坏。与由塑料制成的轴瓦相比，脏物颗粒嵌入到轴瓦1、1’的滑动表面的危险性也降低了。
在图1所示的构造形式中，轴瓦1、1’为两部分构造。它由两个轴对称的半部分构成。这两个半部分通过起铰链作用的连接板8彼此连接。通过这一措施简化了球节的安装。此外在轴瓦1、1’的下面区域中，还构造有在它的圆周上环绕的凸缘11，该凸缘挤压在封闭环13和活节壳6之间。通过与轴瓦的开口边缘9、9’平行设置的凸缘11，在安装时轴瓦1、1’被固定在活节壳6中，并且因此在根据规定使用球节时，防止发生不希望的转动。
为了进一步提高其耐磨性，将轴瓦1、1’的金属内层2的表面例如进行淬火或者QP处理，也就是进行渗氮处理。它的外层3例如由聚甲醛(POM-Polyoxymethylen)构成。通过这种材料的弹性，从活节轴颈4、5经过轴瓦1、1’传递到活节壳6上的振动，特别是固体声，以有利的方式得到衰减。因此，由于根据本发明的轴瓦1、1’的构造，以良好的方式将满足其承载能力的要求和已存在的舒适性方面的要求相实现结合起来。轴瓦1、1’的由塑料构成的外层3优选是喷射到金属内层2上的。然而试验表明，也可将外层3和内层2粘接起来。
图2再一次示出以本发明的方式构造的两部分构成的轴瓦1、1’的立体图。从图中可以看到两个半壳为两层构造，并且通过起铰链作用的连接板8彼此连接。此外在该图中还可以看到前面已经提到的在轴瓦的圆周上环绕的凸缘11。此外还可看到在轴瓦1、1’的金属内表面上设置了槽12。通过这个槽12，形成了用于对球节进行持续润滑的油储存部。
附图标记列表
1、1’轴瓦
2、2’(金属)内层
3、3’(塑料)外层
4、5活节轴颈
4活节球
5活节轴颈的杆
6活节壳
7密封膜盒
8接板，连接板
9、9’边缘，开口边缘
10开口
11凸缘
12槽，润滑剂储存部
13封闭环

Claims (11)

1.球节，包括：一侧敞开的活节壳(6)；活节轴颈(4、5)，该活节轴颈的在其一端形成的活节球(4)被活节壳(6)容纳；布置在活节壳(6)和活节球(4)之间的、同样在一侧敞开的并基本为球形的轴瓦(1、1’)，该轴瓦具有持续润滑的内壁以及封闭环(13)和密封膜盒(7)，它们在活节球(4)与活节轴颈(4、5)的从活节壳伸出的杆部(5)之间的过渡区域中将活节壳(6)的敞开侧封闭和密封，其中轴瓦(1、1’)构造为至少两层的，其特征在于，轴瓦(1、1’)的内层(2、2’)由金属构成，它的外层(3、3’)由塑料构成，其中轴瓦(1、1’)构造为两部分的，其中轴瓦(1、1’)的两个分别为两层或者多层的部分通过起铰链作用的接板(8)彼此连接。
2.按照权利要求1所述的球节，其特征在于，轴瓦(1、1’)构造为两部分的，其中金属内层(2、2’)以及由塑料构成的外层(3、3’)通过粘接彼此连接。
3.按照权利要求1所述的球节，其特征在于，一侧敞开的轴瓦(1、1’)分成两个轴对称的半部分，它们通过两个深拉的金属半壳形成，这两个金属半壳在其外圆周上由塑料层覆盖，并通过接板(8)彼此连接，其中所述半壳的处在轴瓦(1、1’)的敞开侧的边缘(9、9’)在半壳关闭时围成圆形的开口(10)，并且轴瓦(1、1’)的对称轴线(y)垂直地延伸穿过该圆形开口(10)的直径。
4.按照权利要求1或2所述的球节，其特征在于，与轴瓦(1、1’)的开口边缘(9、9’)平行地布置有在开口边缘的圆周上环绕的凸缘(11)，通过该凸缘，形成了用于布置在活节壳(6)中的轴瓦(1、1’)的固定机构和防转动机构，其中凸缘(11)挤压在封闭环(13)和活节壳(6)之间。
5.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的金属内层(2、2’)在其面朝活节球的表面上具有至少一个槽(12)，该槽形成用于润滑剂的储存部。
6.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的金属内层(2、2’)面朝球节(4)的表面被镀铬，用于提高其耐磨性。
7.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的金属内层(2、2’)面朝球节(4)的表面被淬火，用于提高其耐磨性。
8.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的金属内层(2、2’)面朝球节(4)的表面被渗氮处理，用于提高其耐磨性。
9.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的外层(3、3’)由聚甲醛构成。
10.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的外层(3、3’)由聚酰胺构成。
11.按照权利要求1或2所述的球节，其特征在于，轴瓦(1、1’)的外层(3、3’)由聚醚醚酮构成。
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