JPH01124448U

JPH01124448U -

Info

Publication number: JPH01124448U
Application number: JP2091788U
Authority: JP
Priority date: 1988-02-19
Filing date: 1988-02-19
Publication date: 1989-08-24

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す概略構成図、
第２図は本考案を適用した場合の１→２変速時の
アプライ圧とリリース圧室内の残留圧との関係を
示す液圧特性図、第３図は本考案を適用した場合
の１→２変速時の出力軸特性図、第４図は従来の
液圧制御装置の可変絞り機構を示す概略構成図、
第５図は従来の１→２変速時のアプライ圧とリリ
ース圧室内の残留圧との関係を示す液圧特性図、
第６図は従来の１→２変速時の出力軸特性図であ
る。１０……液圧制御装置、１２……バンドブレー
キ、１４……バンドサーボ、１６……アプライ圧
室、１８……リリース圧室、２２……回路（液圧
排除回路）、３０……可変絞り機構、３２……小
径オリフイス、３４……大径オリフイス、３６…
…タイミング弁、４０……ガバナバルブ。 FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
Figure 2 is a hydraulic characteristic diagram showing the relationship between the apply pressure and the residual pressure in the release pressure chamber during a 1 to 2 shift when the present invention is applied, and Figure 3 is a 1 to 2 shift when the present invention is applied. Output shaft characteristic diagram during gear shifting; Figure 4 is a schematic configuration diagram showing a variable throttle mechanism of a conventional hydraulic pressure control device;
Figure 5 is a hydraulic characteristic diagram showing the relationship between the apply pressure and the residual pressure in the release pressure chamber during a conventional 1->2-speed shift.
FIG. 6 is an output shaft characteristic diagram during a conventional 1->2 shift. 10... Hydraulic pressure control device, 12... Band brake, 14... Band servo, 16... Apply pressure chamber, 18... Release pressure chamber, 22... Circuit (hydraulic pressure exclusion circuit), 30... Variable throttle Mechanism, 32...Small diameter orifice, 34...Large diameter orifice, 36...
...Timing valve, 40...Governor valve.

Claims

[Claims for Utility Model Registration] An automatic transmission in which a plurality of gears can be obtained by engaging and disengaging a plurality of friction elements incorporated in a gear train, wherein at least one friction element is incorporated in a gear train.
A band brake is used, and a band servo that drives the band brake is provided with an apply pressure chamber on the band brake engagement side and a release pressure chamber on the band brake release side, which are separated by a servo piston, and In a hydraulic pressure control device, the hydraulic pressure elimination circuit of the release pressure chamber is provided with a variable throttling mechanism that receives a pressure corresponding to vehicle speed as a switching signal, and the throttling amount of the variable throttling mechanism is set to be large at a predetermined vehicle speed or higher, The apply pressure of the band servo is introduced into the variable throttle mechanism as a switching signal, and the apply pressure acts in the same direction as the vehicle speed corresponding pressure, and only when the vehicle speed is above a predetermined vehicle speed and the apply pressure is above a predetermined pressure, the variable throttle mechanism A hydraulic pressure control device for an automatic transmission characterized by setting a large amount of throttle of the mechanism.