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:
Jan. 21, 2003
Filed:
Jun. 30, 2000
Masahiro Gotou, Anjo, JP;
Osamu Fukukawa, Anjo, JP;
Masaki Saitou, Anjo, JP;
Hideyuki Nagai, Anjo, JP;
Hiroshi Katou, Anjo, JP;
Aisin AW Co., Ltd., , JP;
Abstract
The present invention provides an internally-toothed member of reduced size and enhanced quality, durability and productivity in manufacture. This internally-toothed member has a first cylinder portion and a second cylinder portion which is larger in diameter than the first cylinder portion. First and second internal teeth are formed to protrude radially inwardly from inner peripheral surfaces of the first and second cylinder portions respectively. Because a meshing portion can be formed as second internal teeth protruding from an inner periphery of the second cylinder portion, the diameter of the internally-toothed member is relatively small. Because the area between the second internal teeth and a concave portion and the concave portion itself do not decrease in thickness during formation of the second internal teeth, it is possible to prevent cracking and to thereby enhance durability of the internally-toothed member. Further, because there is no sagging of the inner peripheral surface of the meshing portion, the quality of the internally-toothed member is further enhanced.