The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1984
Filed:
Mar. 23, 1981
Wesley M Dick, Ft. Wayne, IN (US);
Dana Corporation, Toledo, OH (US);
Abstract
A speed change mechanism, which includes a housing enclosing a travelling nut on a rotatable screw shaft, incorporates a device for limiting torsional impact loads on the shaft. In a preferred embodiment, the torque limiting device is comprised of two groups of annular members at each end of the shaft for frictionally absorbing impact loads created by sudden stoppage of the nut at respective ends of the shaft. Each group is comprised of at least one friction disc rotatably fixed but axially slidable with respect to the nut, and at least one torque reaction member non-rotatable within the housing against which an associated friction disc is urged via spring. Inertial loads created at ends of nut travel are thereby transferred to the housing instead of the screw shaft. In addition, the two groups of annular members cooperate with the spring to provide a pre-load shifter function for the speed change mechanism.