| abstract |
Provided is a universal joint in which a foamed solid lubricant is enclosed, which has a long life, is low in cost, is excellent in productivity, and can simultaneously reduce environmental burden. A universal joint in which a foamed solid lubricant is enclosed around a torque transmission member (ball). The foamed solid lubricant includes a lubricating component, a resin component, a curing agent, and a foam. The above-mentioned lubricating component is at least one lubricating component selected from lubricating oils and / or greases, and the resin component has an isocyanate group content of 2% by weight or more and 6% by weight. Less than the urethane prepolymer, the foaming agent is water, and the mixture contains 30 to 70% by weight of the lubricating component with respect to the whole mixture, and the open cell ratio after foaming is 50% or more. [Selection] Figure 1 |