CN101168223A - 发动机机架轴承套筒的维修 - Google Patents

发动机机架轴承套筒的维修 Download PDF

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CN101168223A
CN101168223A CNA2007101823805A CN200710182380A CN101168223A CN 101168223 A CN101168223 A CN 101168223A CN A2007101823805 A CNA2007101823805 A CN A2007101823805A CN 200710182380 A CN200710182380 A CN 200710182380A CN 101168223 A CN101168223 A CN 101168223A
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bearing
dead eye
calibration sleeve
size calibration
pitman arm
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A·R·格雷顿
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RTX Corp
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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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/02—Sliding-contact bearings
    • F16C23/04—Sliding-contact bearings self-adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
    • B64D27/40—Arrangements for mounting power plants in aircraft
    • B64D27/404—Suspension arrangements specially adapted for supporting vertical loads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
    • B64D27/40—Arrangements for mounting power plants in aircraft
    • B64D27/406—Suspension arrangements specially adapted for supporting thrust loads, e.g. thrust links
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/40—Maintaining or repairing aircraft
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact 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
    • F16C2237/00—Repair or replacement
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/43—Aeroplanes; Helicopters
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly
    • 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
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    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y10T29/49233—Repairing, converting, servicing or salvaging
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49638—Repairing
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49643—Rotary bearing
    • Y10T29/49647—Plain bearing
    • Y10T29/49648—Self-adjusting or self-aligning, including ball and socket type, bearing and component making
    • Y10T29/4965—Deforming socket to secure ball
    • Y10T29/49652—Die-press shaping
    • 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
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    • Y10T29/49718—Repairing
    • 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
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    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y10T29/49723—Repairing with disassembling including reconditioning of part
    • Y10T29/49725—Repairing with disassembling including reconditioning of part by shaping
    • Y10T29/49726—Removing material
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y10T29/4973—Replacing of defective part
    • 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
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    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/4994—Radially expanding internal tube

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Sliding-Contact Bearings (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

发动机机架组件的轴承孔必须定期维修。拆下一个组件，并从轴承孔中取下轴承。对轴承孔的内表面进行机械加工以便除去任何损坏。选择尺寸校准套筒以便与轴承孔的经过机械加工的内表面以及新轴承的外表面压配合。将轴承压配进尺寸校准套筒内，并将尺寸校准套筒压配进轴承孔内。旋锻尺寸校准套筒和轴承的外表面以便协助固定轴承、尺寸校准套筒和发动机机架组件并防止它们之间的相对运动。

Description

发动机机架轴承套筒的维修
技术领域
一般来说，本发明涉及维修飞机发动机机架的方法，更具体地说，涉及通过利用套筒来维修形成在飞机发动机机架中的轴承孔的方法。
背景技术
飞机利用发动机机架来固定发动机。通常，会有多个发动机机架与每个发动机相关联。在每个发动机机架中存在多个轴承，这些轴承被压入轴承孔内。前发动机机架和后发动机机架位于飞机的机翼和发动机之间。轴承协助将发动机推力传递给机翼。后发动机机架位于飞机外壳和发动机之间，并且那些发动机机架中的轴承协助将发动机的垂直运动传递给机翼。
随着时间的推移，轴承可能会在轴承孔内发生偏移，从而对轴承孔造成磨损或损坏。在飞机寿命内的定期时间间隔，取下发动机机架，并对轴承孔进行维修。对轴承孔的内径进行机械加工以便除去任何损坏，并用新轴承替换用旧的轴承。对轴承孔进行机械加工会使内径过大，并且通常要对特殊尺寸的轴承进行备货以便装配在经过机械加工的轴承套筒内。由于需要许多不同的变型和类型，所以特殊尺寸的轴承的获得和备货很费成本。
因此，需要一种无需特殊尺寸的轴承便可维修飞机发动机机架内的轴承孔的方法。
发明内容
本发明提供一种维修形成在飞机发动机机架中的轴承孔的备选方法。
多个发动机机架支撑飞机上的发动机，并且协助传递发动机相对于飞机的任何运动。每个发动机机架都包括用于将发动机连接到发动机机架的轴承。一种类型的机架包括连杆总成。每个连杆总成在将该连杆总成附接到梁总成的附接点处具有一个轴承，并且也可以在发动机安装点处具有轴承。随着时间的推移，轴承会相对于连杆总成发生运动，从而对连杆总成造成磨损和损坏。从发动机机架上取下连杆总成并对其进行维修。
从梁总成拆下包括轴承的连杆臂。从连杆臂内的轴承孔中取下轴承。对轴承孔的内表面进行机械加工以便除去任何损坏。在连杆臂的第一面和第二面上对轴承孔的内表面增加连杆倒角。
选择尺寸校准套筒以使其具有使得它将被压配进轴承孔的内表面中的直径。尺寸校准套筒具有用于容纳新轴承的外表面以便作为压配合的内孔。将轴承压配进尺寸校准套筒内，并将尺寸校准套筒压配进轴承孔内。当压配在一起时，在连杆倒角、尺寸校准套筒和轴承之间存在间隙。将尺寸校准套筒和轴承的外表面旋锻(swage)进连杆倒角中以便将这些组件固定在连杆中。旋锻轴承和尺寸校准套筒有助于固定轴承、尺寸校准套筒和连杆臂并防止它们之间的相对运动。然后，将连杆臂和连杆总成以及发动机机架重新组装在一起。这一相同的基本维修方法可以应用于其它发动机机架轴承。
为了便于旋锻，轴承在沿径向的中间位置处形成有切口部分，以便形成径向外部，该径向外部将与尺寸校准套筒一起沿径向向外旋锻进轴承孔中的连杆倒角内。
根据以下说明和附图，可以最好地理解本发明的这些和其它特征，以下是对附图的简要说明。
附图说明
图1是飞机的实例前发动机机架的透视图；
图2是飞机的实例后发动机机架的透视图；
图3是实例连杆臂总成的透视图；
图4是实例连杆臂总成的分解图；
图5A示出旋锻之前的实例连杆总成；以及
图5B示出旋锻之后的实例连杆总成。
具体实施方式
图1是飞机的实例前发动机机架10的透视图。前发动机机架10在机翼上支撑发动机，并且协助将发动机的推力传递给飞机。前发动机机架10包括梁总成12，该梁总成12具有用于将前发动机机架10连接到飞机机翼的机翼安装点14。连杆总成16从梁总成12向外延伸。连杆总成16各自具有用于将发动机连接到前发动机机架10的发动机安装点18。每个连杆总成16在将该连杆总成16附接到梁总成12的附接点处具有轴承20。另外，也可以在发动机安装点18处设置轴承20。
图2是飞机的实例后发动机机架22的透视图。后发动机机架22在飞机外壳上、具体来说是在涡轮排气机壳上支撑发动机，并且协助吸收由于发动机的重量引起的垂直运动。后发动机机架22包括梁总成24，该梁总成24具有用于将后发动机机架22连接到飞机的飞机安装点26。连杆总成28从梁总成24向外延伸。连杆总成28各自具有用于将发动机连接到后发动机机架22的发动机安装点30。每个连杆总成28在将该连杆总成28附接到梁总成24的附接点处具有轴承32。另外，也可以在发动机安装点30处设置轴承32。注意，轴承132也是连杆的一部分。本发明延伸到对该位置的维修。
参照图3和图4，示出后发动机机架22的实例发明连杆总成28。应了解，本发明还延伸到前机架的连杆总成和轴承132。连杆总成28包括连杆臂36。在连杆臂36内形成有轴承孔38，并且在轴承套筒38内设置有尺寸校准套筒40。尺寸校准套筒40具有限定外表面42和内表面44的环形形状。尺寸校准套筒40压配进轴承孔38内。即，轴承孔38的外表面42的直径略大于轴承孔38的内表面46的直径。
在尺寸校准套筒40内设置有轴承48。轴承48压配进尺寸校准套筒40内。即，外轴承表面50的直径略大于尺寸校准套筒40的内表面44的直径。
在轴承孔38的内表面46上对连杆臂36进行机械加工。在连杆臂36的第一面60和连杆臂36的第二面62上对内表面46增加连杆倒角52。在压配合后，在连杆倒角52和尺寸校准套筒40之间留有间隙54(如图5A所示)。
现在将描述维修过程。从前发动机机架10或后发动机机架22上取下典型连杆总成28。该实例连杆总成28包括从连杆36中取下的原始轴承48。该原始轴承通常已经对内表面46造成了磨损和损坏。对内表面46进行机械加工，以便除去损坏和磨损。在内表面46上加工倒角52。经过加工后的内表面46现在具有更大的直径。
选择尺寸和原始轴承相同或类似的轴承48以便替换原始轴承。轴承48具有可以很容易获得的标准或现货尺寸。选择尺寸校准套筒40以使其与轴承孔38的内表面46和轴承48的外表面50压配合。将轴承压入尺寸校准套筒40中。然后，将尺寸校准套筒40和轴承48压入轴承孔38内。实际上，压配合可以通过以下方法来实现：首先，通过将这些组件放到液氮中来收缩装配这些组件；然后，让它们膨胀回去以便压配合。
图5A和图5B示出旋锻前后的连杆总成28。在旋锻之前，已经将尺寸校准套筒40和轴承48压入轴承套筒38内。连杆倒角52和尺寸校准套筒40之间的间隙54仍然存在。由图5A可见，轴承具有切口部分106，该切口部分106限定径向外部108，在图5B中看该径向外部108已经在110处被旋锻进轴承套筒上的倒角52中。旋锻轴承48和尺寸校准套筒40有助于将校准尺寸套筒40固定在轴承套筒38内，且有助于将轴承48固定在校准尺寸套筒40内。图5A中示意性地示出旋锻工具200。旋锻还有助于防止轴承48、尺寸校准套筒40和连杆臂36之间的相对运动。
尽管图中示出倒角以便形成用于容纳旋锻后的材料的空间，但是也可以利用其它形状的空间。
尽管公开了本发明的优选实施例，但本领域的技术人员将了解，某些修改会落在本发明的范围内。为此，应研究所附权利要求以便判定本发明的真实范围和内容。

Claims (17)

1.一种维修发动机机架总成的方法，包括：
对轴承孔的内表面进行机械加工并扩大所述内表面；
将尺寸校准套筒压入所述轴承孔中；
将轴承压入所述尺寸校准套筒中；以及
在所述轴承孔的第一面和第二面上紧固所述轴承和所述尺寸校准套筒，以便将所述尺寸校准套筒和所述轴承固定在所述轴承孔内。
2.如权利要求1所述的方法，其特征在于，所述机械加工步骤包括在对所述内表面进行机械加工之前从所述轴承孔中取下用过的轴承。
3.如权利要求2所述的方法，其特征在于，所述机械加工步骤包括：对所述轴承孔进行机械加工，直到除去所述轴承孔的内表面上的损坏为止。
4.如权利要求1所述的方法，其特征在于，将所述尺寸校准套筒压入所述轴承孔中的步骤包括：选择尺寸校准套筒，使其外表面直径对应于所述轴承孔的经过扩大后的内表面的直径，且其内表面直径对应于所述轴承的外径。
5.如权利要求1所述的方法，其特征在于，所述紧固步骤包括在所述第一面和所述第二面上旋锻所述轴承使得所述尺寸校准套筒进入所述轴承孔中的空间内。
6.如权利要求5所述的方法，其特征在于，所述轴承在沿径向的中间位置处形成有切口部分，以便提供将被旋锻进入所述孔上的所述空间中的部分。
7.如权利要求1所述的方法，其特征在于，将所述轴承压入所述尺寸校准套筒内的步骤发生在将所述尺寸校准套筒压入所述连杆臂内的步骤之前。
8.如权利要求1所述的方法，其特征在于，所述轴承孔位于连杆臂中。
9.一种维修发动机机架的连杆总成的方法，包括：
从飞机中取下连杆臂，并从形成在所述连杆臂中的轴承孔中取下用旧的轴承；
对所述轴承孔的内表面进行机械加工；
将尺寸校准套筒压入所述轴承孔内；
将轴承压入所述尺寸校准套筒内；
在所述连杆臂的第一面和第二面上紧固所述尺寸校准套筒和所述轴承，以便将所述轴承固定在所述轴承孔内；以及
将所述连杆臂组装到所述飞机上。
10.如权利要求9所述的方法，其特征在于，所述机械加工步骤包括：对所述轴承孔的内表面进行机械加工，直到除去损坏为止。
11.如权利要求9所述的方法，其特征在于，将所述尺寸校准套筒压入所述轴承孔内的步骤包括：选择尺寸校准套筒，使其外表面直径的选择基于机械加工之后的所述轴承孔的内表面的直径，且其内表面直径对应于所述轴承的外径。
12.如权利要求10所述的方法，其特征在于，紧固所述轴承的步骤包括在所述连杆臂的第一面和第二面上旋锻所述轴承。
13.如权利要求12所述的方法，包括以下步骤：在所述轴承孔的内表面上紧邻所述连杆臂的第一面的位置处形成空间；在所述轴承孔的内表面上紧邻所述连杆臂的第二面的位置处形成空间；以及在所述紧固步骤中将所述轴承和所述尺寸校准套筒旋锻进所述空间内。
14.如权利要求13所述的方法，其特征在于，所述轴承在沿径向的中间位置处形成有切口部分，以便提供将被旋锻进所述轴承孔上的所述空间中的部分。
15.一种飞机发动机的发动机机架，包括：
具有用于限定轴承孔的内孔的机架部分，所述内孔的内径在维修步骤经过机械加工而变成大于初始尺寸；
压紧配合进所述内孔中的尺寸校准套筒，所述尺寸校准套筒的外径是基于所述内孔的内径选择的；
压紧配合进所述尺寸校准套筒的内孔中的轴承，所述轴承的外径略大于所述尺寸校准套筒内的所述内孔的内径；以及
将所述轴承和所述尺寸校准套筒紧固到所述轴承孔中。
16.如权利要求15所述的发动机机架，其特征在于，所述轴承的表面与所述尺寸校准套筒一起被旋锻进所述轴承孔上的空间中。
17.如权利要求16所述的发动机机架，其特征在于，所述轴承在沿径向的中间位置处形成有切口部分，以便提供将被旋锻进所述轴承孔上的所述空间中的部分。
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