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:
May. 05, 1992
Filed:
Sep. 10, 1990
Madison K Robinson, Bedford, TX (US);
Bell Helicopter Textron Inc., Fort Worth, TX (US);
Abstract
A pitch change bearing assembly for a helicopter hub (10) having a yoke (14) and a grip (12) includes a shaft (24) having first and second ends (24a, 24b). A first radial elastomeric bearing (60) is disposed on the first end (24a) of the shaft (24). A second radial elastomeric bearing (62) is disposed on the second end (24b) of the shaft (24). The first and second radial elastomeric bearings (60, 62) are disposed parallel to one another. A third radial elastomeric bearing (66) is disposed on the shaft between and spaced apart from the first (60) and second (62) radial elastomeric bearings and is parallel to the first and second radial elastomeric bearings (60, 62). Structure (28, 30) is provided for attaching the third radial elastomeric bearing (66) to the grip (12). Structure (48, 50) is further provided for attaching the first and second radial elastomeric bearings (60, 62) to the yoke (14). The assembly allows for transmission of all applicable loads in a compact manner with significant compactness in the diametral direction due to the torsional motion sharing between bearing elements.