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:
Jul. 25, 2000
Filed:
Nov. 04, 1997
NSK Ltd., Tokyo, JP;
Abstract
A ball screw device of a ball-circulating-part embedded type includes: a screw shaft having a helical thread groove on an outer peripheral surface thereof; a ball nut having a thread groove provided on an inner peripheral surface thereof in correspondence with the thread groove of the screw shaft, the screw shaft being loosely fitted in the inner peripheral surface of the ball nut; and a multiplicity of balls rotatably fitted between the two thread grooves and adapted to circulate while being guided by a ball-circulating part fitted in the ball nut wherein the ball nut has a retaining recess on an outer peripheral surface thereof, wherein at least a portion of a fitted outward surface of the ball-circulating part is substantially flush with the outer peripheral surface of the ball nut in a vicinity of the fitted outward surface of the ball-circulating part, and wherein there is provided a circulating-part holding member for fixing the ball-circulating part to the ball nut by being fitted over the outer peripheral surface of the ball nut and covering the fitted outward surface of the ball-circulating part, the circulating-part holding member having a projection for engaging the retaining recess of the ball nut.