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:
Sep. 13, 1994
Filed:
Jan. 21, 1992
Ichiro Okabe, Yamatotakada, JP;
Satoshi Kawai, Sakurai, JP;
Hideki Higashira, Ikoma, JP;
Hirakushi Suzou, Uda, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A power transmission apparatus for vehicle capable of obtaining a plurality of transmission characteristics by moving spools of variable throttle member 6 according to controlling current flowing to a driving coil 7 by steps, wherein a spool chamber 60 housing a first and second spools 61, 62 therein is communicated with discharge side of a vane pump 3 according to first and second communicating holes 54, 55. And by controlling current flowing to the driving coil 7 by steps, two kinds of magnetic fields, intense and weak are formed in the spool chamber 60. In the case where the first spool 61 moves to the position where it is contacted with the inside end of the spool chamber 60 by the action of the weak magnetic field, it closes an opening end of one communicating hole 54, and in the case where the second spool 62 moves to the position where it is contacted with the first spool 61, it opens an opening end of the other communicating hole 55. Three kinds of different transmission characteristics are obtained in the above mentioned cases and case of current cutoff, and the positions of the first and second spools 61, 62 do not vary in the respective cases. Thereby, positional variation caused at, spools are prevented and the respective transmission characteristics are stabilized.