JPS6394348U

JPS6394348U -

Info

Publication number: JPS6394348U
Application number: JP19084986U
Authority: JP
Priority date: 1986-12-11
Filing date: 1986-12-11
Publication date: 1988-06-17

Description

[Brief explanation of the drawing]

第１図は本考案の自動変速機用液圧サーボ機構
の一実施例を示す断面図、第２図は本考案に用い
られる排出弁の一実施例を示す拡大断面図、第３
図は従来の自動変速機用液圧サーボ機構の断面図
である。１００……バンドサーボ（液圧サーボ機構）、
１０１……第１ピストン、１０２……２速アプラ
イ圧室（締結圧室）、１０３……３速リリース圧
室（解放圧室）、１０４……第２ピストン、１０
５……ハウジング、１０６……４速アプライ圧室
（締結圧室）、１２２……バンドブレーキ（摩擦
係合要素）、１３０……コントロールバルブ、１
３１……液圧供給回路、１３１ａ……通路口、１
３５……ドレン回路、１４０……排出弁、１４１
……第１弁座、１４２……第２弁座、１４４……
ボール弁体。 FIG. 1 is a cross-sectional view showing an embodiment of the hydraulic servo mechanism for an automatic transmission of the present invention, FIG. 2 is an enlarged cross-sectional view showing an embodiment of the discharge valve used in the present invention, and FIG.
The figure is a sectional view of a conventional hydraulic servo mechanism for an automatic transmission. 100...Band servo (hydraulic servo mechanism),
101...First piston, 102...2nd speed apply pressure chamber (clamping pressure chamber), 103...3rd speed release pressure chamber (release pressure chamber), 104...2nd piston, 10
5...Housing, 106...4-speed apply pressure chamber (clamping pressure chamber), 122...Band brake (frictional engagement element), 130...Control valve, 1
31...hydraulic pressure supply circuit, 131a...passage opening, 1
35... Drain circuit, 140... Discharge valve, 141
...First valve seat, 142...Second valve seat, 144...
Ball valve body.

Claims

[Scope of utility model registration request]

The housing has a closing pressure chamber and a releasing pressure chamber separated by a piston, and by supplying hydraulic pressure from a control valve to one of these closing pressure chambers and releasing pressure chamber, the other is drained through an orifice. The frictional engagement element is fastened by supplying hydraulic pressure to the engagement pressure chamber, and the frictional engagement element is released by supplying hydraulic pressure to the release pressure chamber. In the hydraulic servo mechanism for an automatic transmission, a first valve seat disposed approximately horizontally in a hydraulic pressure supply circuit in a control valve that supplies hydraulic pressure to the engagement pressure chamber, the release pressure chamber, or both chambers; A second valve seat is provided at an angle adjacent to the first valve seat and communicates with the drain circuit, and a ball valve body is disposed rotatably between the first and second valve seats to form a discharge valve. and a passage opening of the hydraulic pressure supply circuit provided on the downstream side of the discharge valve is formed near the arrangement side of the second valve seat, and when the passage opening is seated on the second valve seat. A hydraulic servo mechanism for an automatic transmission, characterized in that it overlaps the ball valve body in a hydraulic fluid flow direction.