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Bearings for use in negative-pressure environments

  • US 5,028,219 A
  • Filed: 08/21/1989
  • Issued: 07/02/1991
  • Est. Priority Date: 08/11/1989
  • Status: Expired due to Fees
First Claim
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1. A vacuum pump of the type including a rotor and at least one bearing supporting said rotor, said vacuum pump comprising the following:

  • said at least one bearing including a plurality of ceramic rolling members, an inside bearing ring, and an outside bearing ring located in an environment subject to negative pressure during operation of said pump;

    means for supplying lubricant to said at least one bearing and establishing a lubricant film between said rolling members and said bearing rings; and

    setting means for adjusting setting forces of said at least one bearing, said setting means including a pair of setting sleeves axially reciprocable in a spindle sleeve, and a compression spring biasing said setting sleeves in opposite directions, a pair of end caps closing opposite ends of said spindle sleeve, and annular lubricant reservoirs within said sleeves.

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