FIELD: transport.
SUBSTANCE: invention relates to machine building. Ball-type coupler comprises one ball and coupler thrust bearing to be engaged with said ball. Bal has bulged fit zone while thrust bearing has mating fit zone in its recess. With coupled engaged, said zones make fit zone. Ball and thrust bearing may be disengaged between said zones. Coupler one element, ball or thrust bearing, comprises one seal to seal fit zone for protection against ambient medium. Said seal is arranged with radial clearance relative to coupler axis A.
EFFECT: higher reliability.
27 cl, 9 dwg
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