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The Common Berthing Mechanism (CBM) is a berthing mechanism used to connect all non-Russian pressurized modules of the International Space Station. It was developed by Boeing at the Marshall Space Flight Center (MSFC) in Huntsville, Alabama while under contract to the National Aeronautics and Space Administration (NASA).〔 A CBM consists of two components: the active common berthing mechanism (ACBM) and the passive common berthing mechanism (PCBM). Once connected, the two sides of the CBM form a pressure tight seal. The CBM also features a hatch, which can be opened to reveal a 50 inch (127 cm) diameter passage for crew/cargo transfer. Since this passage is large enough to allow International Standard Payload Racks to fit, payloads can be pre-configured in racks and transported to the station aboard the Multi-Purpose Logistics Modules, which use CBM ports. Once the hatches have been opened, electrical, data, and fluid lines can be manually connected through the CBM vestibule by the crew. The first modules in space using the CBM were ''Unity'' and the Pressurized Mating Adapters ''PMA-1'' and ''PMA-2'', with all three being launched attached together aboard ''Endeavour''. The first berthing in space using the CBM was the connecting of the Z1 truss to ''Unity'' on the International Space Station.〔 The CBM is used as a berthing mechanism for the unmanned Japanese H-II Transfer Vehicle (HTV), SpaceX Dragon, and Orbital Sciences' Cygnus spacecraft. These spacecraft feature a PCBM, and are berthed to one of the station's open ACBMs using the station's robot arm.〔()〕 Each CBM compatible module that connects to previously launched modules requires a PCBM to connect to an ACBM.〔 The three ISS connecting nodes feature four radial ACBM ports. ''Unity'' features two ACBM on the axial side, while ''Harmony'' and ''Tranquility'' feature a PCBM on one axial side and an ACBM on the other axial side.〔(【引用サイトリンク】title=Node 3 Description )〕 The ''Destiny laboratory and the Japanese Pressurised Module both feature one PCBM and one ACBM. ==Gallery== File:COTS2Dragon CBM.jpg|A passive CBM File:Common Berthing Mechanism with micrometeorite layer.jpg|An active CBM with covers closed File:Closing of CBM covers.ogv|Closing of an active CBM's covers 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Common Berthing Mechanism」の詳細全文を読む スポンサード リンク
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