Patent ID: 7934438
Filing Date: 2011-05-03
Classification: F16H,Y10T

Abstract:
1. A ball screw device comprising: a screw shaft including an outer thread formed thereon, a ball nut including a bore formed therein for receiving said screw shaft, and including an inner thread formed therein for forming a helical raceway between said ball nut and said screw shaft, said ball nut including two openings formed therein and communicating with said bore of said ball nut, a plurality of bearing members received in said helical raceway between said ball nut and said screw shaft for facilitating a rotating movement between said ball nut and said screw shaft, and a circulating device including an elongate member having two end blocks for engaging into said openings of said ball nut, said elongate member including a passage formed therein and directed toward said inner thread of said ball nut and said outer thread of said screw shaft for receiving said bearing members, said end blocks each including a deflecting tongue provided therein for forming a portion of said passage of said elongate member and for directing said passage of said elongate member toward said inner thread of said ball nut and said outer thread of said screw shaft, said end blocks of said circulating device each including a compartment formed therein for receiving a lubricating oil therein, and each including a groove formed therein and communicating with said compartment of said end block and communicating with said passage of said elongate member for allowing said lubricating oil in said compartment of said end block to flow into said passage of said elongate member and then to flow into said inner thread of said ball nut and said outer thread of said screw shaft, and said circulating device including an outer housing member and an inner casing member each including a portion of said passage of said elongate member formed therein.