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. 26, 2012
Filed:
Apr. 16, 2009
Toshiharu Takashima, Kariya, JP;
Yuji Okawa, Kariya, JP;
Toshiharu Takashima, Kariya, JP;
Yuji Okawa, Kariya, JP;
JTEKT Corporation, Osaka-shi, JP;
Abstract
In a main spindle device provided with a housing and a main spindle, a labyrinth-forming annular groove is formed, in the circumferential direction of the main spindle, on the outer circumferential surface of a protruding portion of the spindle that protrudes from the housing on the front side. A housing lid member having a protruding portion that is inserted into the labyrinth-forming annular groove so as not to contact an inside surface of the labyrinth-forming annular groove all around the periphery is fixed to the housing on the front side thereof and forms a labyrinth seal portion between the protruding portion and the labyrinth-forming annular groove. The housing lid member is constructed so that the housing lid member can be divided into at least two pieces with respect to the circumference of the labyrinth-forming annular groove.