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:
Jun. 05, 2001
Filed:
Nov. 17, 1999
Satoshi Morishima, Osaka, JP;
Takaki Tsuruzono, Katano, JP;
Tsubakimoto Chain Co., Osaka, JP;
Abstract
A linear actuator includes two axially opposed bearings with built-in one-way clutch assembled in a housing member with respective outer races secured to the housing member such that respective directions in which inner races of the bearings are locked against rotation are opposed to each other, a ball bearing shaft relatively and rotatably supported on the inner races of the bearings with bearing bushings disposed between the ball screw shaft and the respective bearings, and two load transmitting collars fixed on the ball screw shaft. When the ball screw shaft is subjected to a thrust load applied from a ball nut in a direction to retract the ball screw shaft, one of the inner race is locked against rotation to thereby exert a braking torque to the corresponding load transmitting collar via an associated friction collar. Alternatively, when the ball screw shaft is subjected to a thrust load tending to extend the ball screw shaft, the other inner race is locked against rotation to thereby exert a braking torque to the corresponding load transmitting collar via an associated friction collar. Thus, rotation of the ball screw shaft under the effect of the thrust load in either direction can be avoided.