| 摘要 |
A four-ball test apparatus for evaluation of friction and wear characteristics of lubricants is disclosed. The test apparatus includes a motor and adjustable weight assembly that is supported by the upper test ball on the lower test balls positioned in a test cup. All of the weight of the motor/weight assembly is supported by the test ball itself, and thrust bearings or the like are not required for support of the test cup. The four-ball test apparatus eliminates numerous sources of error found in prior four-ball testers, and permits various instruments or fluid lines to be connected to the test cup without introducing errors into the test measurements.
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