• 2022-11-04
    一 农用水泵,决定选用深沟球轴承,轴颈直径[tex=4.071x1.0]DeahEHpHEK15z6G0kM/aDw==[/tex],转速[tex=3.429x1.0]LHd73HxBP1hX4+lsaXkdVQ==[/tex][tex=2.786x1.357]lPb5SpSJgP6ODmxA3jYGiQ==[/tex],已知径向载荷[tex=4.571x1.214]NFcpr90xQQ/m6LroxhjfnAt3HdHuguhJ356quCjW3vA=[/tex],轴向载荷[tex=4.214x1.214]HZfcGD/VkKVsq5vWPk30Xr49Ds1ghy5Ki1OO1vXFPdg=[/tex],预期计算寿命[tex=4.286x1.429]BUFcGdY7lXEIZ5UcGsqxGxPHjGWpmn+KVjU5NHS2Af8=[/tex],试选择轴承的型号。
  • 解:根据已知轴径初选6207轴承,其基本额定动载荷[tex=4.857x1.0]p+nixyuPkbVgu8fpEkNikw==[/tex],基本额定静载荷[tex=1.071x1.214]B1GsTTRPOb9lCub1PNQhUQ==[/tex][tex=4.143x1.0]FC4c9uLDsL4B7InoS067mw==[/tex]。(1)确定判断系数[tex=0.5x0.786]ioUTxl0mK3tdEi96ASuHUw==[/tex]值和[tex=0.643x1.0]jDX0Dl5U1AUsM496NyCmSw==[/tex]值F.740查教材表13-5相对轴向载荷[tex=8.429x2.571]ez99K4CyOtcEE83pDLzjDYsQXYJceSrbfApdvG13Ir3NuEcdWyiavTOUWvDE2gSwdCxqrPTIDv23W8SHyZemoQ==[/tex], 插值得判断系数[tex=3.071x1.0]YHJG7jVSpjB8rWoFvKqV2A==[/tex]。又[tex=11.714x2.571]ez99K4CyOtcEE83pDLzjDfpE1XUTMwlwrIMKm4lK5qdygPOI0egEv24ks91dJwlRkohnM6/NF5X0mhCbt6S2+g==[/tex],查教材表13-5得[tex=3.429x1.0]6gw3ZtfYtWesbldmRzuqIw==[/tex],插值得[tex=3.143x1.0]hja2xltjfTZ3Av4GIJvuAA==[/tex]。(2)求当量动载荷P查教材表13-6取载荷系数[tex=3.429x1.286]QkHEjytzXPet/YBE3CjCyIV9Jd+kAl0lKG1NF6dD/ic=[/tex],可得:[tex=26.786x1.357]VQ+a4lz7iwBd/Q77d6GSeae+90Im7XCgEJK2qv6L554dMxb9m08dv4QeIDw9278Y2qDOQYiX5G845oWMpFXBasNOgYhbujWnGC8sIq5OG7+ACpJWSPoze5+3T8Z9V2myNNZZB1dHElqHz96EvZqlUQ==[/tex]此时轴承的寿命:[tex=25.714x2.929]quJlGBsdKDZhh82g0NmkkHUUKw3lBua746YC70EfuT9Eg+wzEJ4v+C3bD9loleCLxMlj369ealcV6QPhp/AGUFMks6pZ8T5/hpC6OQnwrgBbhdHA+AMHRM5WbzWbvY5JEkE+x3h3i42VyyF5ohjnInLorHo5OnXobTVUZygnenfLY+CWNXS63DjKCKkYckGH2J7ge+bn5RQFEvAbO3mqcw==[/tex]不能满足寿命要求,故改选6307轴承,重新计算。其基本额定动载荷[tex=4.857x1.0]r0cknf6R/asTM+bOh2EZLg==[/tex],基本额定静载荷[tex=5.214x1.214]pnlhAFPmAwwZdCeyZ5wJhve5rc21Vy6B9EKW9FQph6M=[/tex],同理计算如下:(1)确定判断系数e值和Y值查教材表13-5,相对轴向载荷[tex=8.429x2.571]ez99K4CyOtcEE83pDLzjDYsQXYJceSrbfApdvG13Ir2beJuV6sc6M7Vl8wfWiVTEvR1UYNurjuzMsPLuHncVGQ==[/tex],插值得判断系数[tex=3.071x1.0]4BfidCbUTuyF9lHmTKCxJA==[/tex].又[tex=11.714x2.571]ez99K4CyOtcEE83pDLzjDfpE1XUTMwlwrIMKm4lK5qdygPOI0egEv24ks91dJwlRSHAdYgGlCxkX+Hs3Oo2KSA==[/tex],查教材表13-5得[tex=3.429x1.0]6gw3ZtfYtWesbldmRzuqIw==[/tex],插值得[tex=2.643x1.0]gzWyJwllacCMRueaBZyjYQ==[/tex]。(2)求当量动载荷P查教材表13 -6取载荷系数[tex=3.429x1.286]QkHEjytzXPet/YBE3CjCyIV9Jd+kAl0lKG1NF6dD/ic=[/tex],可得:[tex=26.286x1.357]VQ+a4lz7iwBd/Q77d6GSeUYHAV5yisXF1h0bIfwlcG8qjIYXEhzCbl1Og3Z0oWhYbauhK+xdUzwC9c5ZBXc4gtjkGRDot99mQJMZfm1SunVTMcl+//x6a88SpSBGSE0ifY0vK7K/yQLlQh0EarTt5Q==[/tex]此时轴承的寿命:[tex=26.786x2.929]quJlGBsdKDZhh82g0NmkkHUUKw3lBua746YC70EfuT9Eg+wzEJ4v+C3bD9loleCLxMlj369ealcV6QPhp/AGUFMks6pZ8T5/hpC6OQnwrgBbhdHA+AMHRM5WbzWbvY5JEkE+x3h3i42VyyF5ohjnIiDj1PjhULax5+HyjWYMaFLO1X3/QyMff0QnlZZ3ar9D1bX7LAEXMpaP0l2/VAykD/8WY7jCmyAyf0mZULJZd5c=[/tex]故6307轴承满足要求。

    举一反三

    内容

    • 0

      下列函数是哪些函数复合而成的?(1)[tex=4.214x1.286]6PuLCl/TwscTl61WSePGog==[/tex];(2)[tex=5.214x1.286]+mZ2Cm2OprRKGTGg0iqmyZx+4lZ796PxrSQNx30R9UU=[/tex];(3)[tex=4.214x1.357]jTbrMH55vzOFOJlLSnfh103OHFmRhIjXZGzPnfweOX0=[/tex];(4)[tex=6.071x1.286]W2A0mViHY0pK74wEByr6ED5K+AKV/pxHaeQdYGQBxwc=[/tex];(5)[tex=6.714x1.429]8up/G1s+GteD9ejcGkFVmYl3TTtTik5kuwrPDCv0JkbGIWyY33cnaw7XtBiPcSnh[/tex];(6)[tex=5.714x1.286]APaFs2rWyubdkzLcUVVxVJSSAsLEOtXn4KjnToE2BQA=[/tex];

    • 1

      根据工作要求,选用内径[tex=4.0x1.0]JnXHBz6zj9U3cJi5lyAaxFB+gIPtJEvGRzMfeB4Cb0c=[/tex]的圆柱滚子轴承。轴承的径向载荷[tex=5.0x1.214]7rGv7n6ynXSyEdkUAK+2fG8YXqEhWJT+QJ5kcZGBQR8=[/tex], 轴的转速[tex=5.0x1.357]3H79rNhVbyUG4AedtMlBCW1XjKsMcG4r88iibSsEB/QTpjXdmFwNMFLtCNHq0g5H[/tex], 运转条件正常,预期寿命 [tex=4.429x1.214]sU6fOX5sZPS2OLFZ7tzRxpAPxBr/CFoXhAdNimIPWbc=[/tex],试选择轴承型号。

    • 2

      有一轴承部件, 其轴承为向心角接触球轴承, 安装形式及尺寸关系如图所示。已知 [tex=5.286x1.214]p3NrgxvW0Da6v6wmBzM+ygPH3+9eLE5Ywe1CVhDBzSE=[/tex], [tex=4.786x1.214]jwLEbcssR+oqWNuhHF1JHl2qa4AWRvTQhw2o1loDu7Q=[/tex], 内部周向力[tex=4.571x1.357]GT0y7xDXZRNUW14wtrfQEEho+4skEKLab9QCQR3afeY=[/tex], 径向动载荷系数及轴向动载荷系数分别 [tex=3.429x1.0]JIwIaCdubc8yv3JmXpwLvQ==[/tex], [tex=2.643x1.0]KZQJESK3Eaxy+W0Dp0Os6w==[/tex], 轴承的基本额定动载荷[tex=5.143x1.0]uwhATqNNKwDqTO+bdYuBB+kqJfqCoPpdG9Ei/QPi3KQ=[/tex], 温度系数[tex=2.643x1.214]9SnD3ef+DnkNoV1oOGb3EQ==[/tex], 载荷系数[tex=2.714x1.286]AsSWgC8EmsC6/4c9u/ko1w==[/tex], 试求每个轴承的当量动载荷及轴承 1 的基本额定寿命。[img=475x238]17d2710e8ec0b3e.png[/img]

    • 3

       对 [tex=0.643x0.786]/he/ol8BkDuTTL9yMPtH4Q==[/tex]的不同值,分别求出循环群[tex=1.143x1.214]StMMJ6qThnpokZJIPGrdFyP3vrLnUdltYxmLxjw8za8=[/tex]的所有生成元和所有子群。(1) 7;           (2) 8;               (3)10 ;(4) 14 ;         (5) 15             (6) 18 。

    • 4

      判断下列命题是否为真:(1)[tex=3.643x1.357]/5abqJjwKZ1qr+6hsVFF5EBvfq3ggOFNlHMClz0h9nk=[/tex](2)[tex=2.929x1.357]rGJpyjIjJpbcoBTWxP0Jiw==[/tex](3)[tex=4.5x1.357]2wycHMoqU83MyEp17iBils58bR7YLuCTI2G9NVAdlfY=[/tex](4)[tex=5.214x1.357]CTz2gu+IIm1GgNmYMGaduCRtA41wnW4WqwRWwEhq6aA=[/tex](5)[tex=4.857x1.357]1DcE2BMMOaZhTuxR/mjgsboXxfg5ET59Dp4I/jjEDuw=[/tex](6)[tex=4.643x1.357]BSryrsQYOvTP2hTWRu6t4nAuJwlSs4L9jaq70EpB+Us=[/tex](7)若[tex=6.0x1.357]y0IZLUnBO88nR8WBZYvd7QXv5S1OMINV5cQNzPyiyAc=[/tex],则[tex=3.429x1.357]1brfPwTkVVIX4GfoMIUskA==[/tex](8)若[tex=7.643x1.357]MhLfJXZnhbXiB0x3oNtFzThV4Y1mJxe1VYr7PkJE/T6hmTD3WWp+UxbNwvUQ6DHk[/tex],则[tex=4.143x1.357]LZUA94ISo1po5HWsOVeBCjo0rMvj7uw3bGw5HiZenrI=[/tex]