If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

outside admission

本贴由 expansionlink 于 2014-06-07 发布. 版块名称: Locomotive M.I.C.

  1. expansionlink

    expansionlink New Member

    注册日期:
    2011-07-20
    帖子:
    2
    支持:
    0
    职业:
    Retired
    所在地:
    Margate. Kent. UK
    I have read, "With outside-admission valves the eccentric or return crank is set at 90 degrees in front of the crank." Can someone please explain to me where this 90 degree angle is, as I just cannot visualise it. Thanks Ian Technophobe!
     
    expansionlink, 2014-06-07
    #1
  2. John Webb

    John Webb Member

    注册日期:
    2010-03-02
    帖子:
    501
    支持:
    86
    职业:
    Retired
    所在地:
    St Albans, Herts
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    It's the angle between the crankpin and the end of the return crank relative to the centre of the axle when the loco is moving forwards. There are several books, including "Handbook for Railway Steam Locomotive Enginemen" (BTC 1957, reprinted by Ian Allan 1977 onwards) with various diagrams which make this clear.
     
    John Webb, 2014-06-07
    #2
  3. Eightpot

    Eightpot Resident of Nat Pres Friend

    注册日期:
    2006-08-10
    帖子:
    8,340
    支持:
    2,506
    性别:
    男
    职业:
    Engineer Emeritus
    所在地:
    Aylesbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Probably better to say that the return crank leads the main crankpin by around 90 degrees. The actual amount is dependant upon the individual layout of the valve gear.
     
    Eightpot, 2014-11-21
    #3
  4. huochemi

    huochemi Part of the furniture

    注册日期:
    2008-05-06
    帖子:
    2,995
    支持:
    1,515
    性别:
    男
    所在地:
    UK
    Heritage Railway Volunteer:
    No I do not currently volunteer
    huochemi, 2014-11-22
    #4
  5. Steve

    Steve Resident of Nat Pres Friend

    注册日期:
    2006-10-07
    帖子:
    12,729
    支持:
    11,847
    职业:
    Gentleman of leisure, nowadays
    所在地:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    does this help with understanding it?
     

    附件文件:

    Steve, 2014-11-22
    #5

分享此页面