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:
Mar. 20, 2012
Filed:
Jun. 20, 2007
Kiyoto Kobayashi, Azumino, JP;
Kiyoto Kobayashi, Azumino, JP;
Harmonic Drive Systems Inc., Tokyo, JP;
Abstract
A tool holder plate () is fixed to a shaft end part () of a hollow motor shaft () of a brushless DC servo motor (), and a cutting tool is mounted in a tool mounting hole () formed in the tool holder plate () and a work is cut-processed by this cutting tool. In order to prevent intrusion of a cutting processing oil containing cutting powder into the inside of the motor from between the shaft end part () of the hollow motor shaft () and an end plate portion () of a motor housing (), a labyrinth seal () including a double circular groove () having a fine width extended in the axis direction () is formed between a metal plate (), the tool holder plate (), and the shaft end part (). The other shaft end part () is also formed with a labyrinth seal () of the same structure. Due to this structure, intrusion of the cutting processing oil into the inside of the motor can be prevented, which can prevent trouble such as early destruction of oil seals () by attachment of the cutting powder contained in the cutting processing oil to the oil seals ().