Abstract: An oscilation absorbing device for use in trailer hitches includes a ball connected to a rear support which is joined to a tractor and a receptor chamber for receiving the ball. The receptor chamber is mounted on a trailer and arranged to turn around the ball. A cover plate encompasses the receptor chamber which is provided with a horizontal pivot. The receptor chamber is pivotally mounted with respect to the ball to permit free angular displacement of the cover plate around the horizontal pivot. The device is also provided with a damping device operatively connected to the ball and including a fluid chamber having a housing with diametral wings and diametral scoops radially outwardly extending from the central axle of the housing.