| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic circuit device of an automatic transmission capable of favorably suppressing the wear of an iron ball receiving surface and a stopper surface of a ball valve. SOLUTION: A through-hole 13 penetrating surface and back sides of an upper body 10 as a valve body of a hydraulic circuit device is formed in the upper body, and the through-hole 13 forms an iron ball chamber 14 for storing an iron ball 15 of a ball valve, and both ends of the through-hole 13 are closed by an iron-made cover plate 11 and an iron-made separate plate 12, respectively. An upper side of the separate plate 12 forms an iron ball receiving surface 18 on which the iron ball 15 is seated when closing the ball valve, and a lower side of the cover plate 11 forms a stopper surface 19 to which the iron ball 15 is abutted when opening the ball valve. COPYRIGHT: (C)2009,JPO&INPIT
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