JPS59183560U

JPS59183560U - Automatic transmission hydraulic control device

Info

Publication number: JPS59183560U
Application number: JP7877183U
Authority: JP
Inventors: 隆弘酒井
Original assignee: トヨタ自動車株式会社
Priority date: 1983-05-24
Filing date: 1983-05-24
Publication date: 1984-12-06

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案による自動変速機の油圧制御装置の一つ
の実施例をその要部について示す油圧回路図、第２図及
び第３図は各々本考案による自動変速機の油圧制御装置
の他の実施例をその要部について示す油圧回路図である
。１・・・セカンドブレーキ、２・・・ダイレクトクラッ
チ、３・・・２−３速変速弁、４・・・スプール弁、５
・・・ライン油圧供給ポート、６・・・第２速用ボート
、７・・・ドレーンポート、８・・・第３速用ポート、
９・・・ドレーンポート、１０・・・絞り、１１・・・
一方向弁、１２・・・油路、１３・・・絞り、１４・・
・一方向弁、１５・・・油路、１６・・・アキュームレ
ータ、１７・・・背圧室、１８・・・圧縮コイルばね、
１９・・・アキュームレータ室、２０・・・アキューム
レータピストン、２１・・・アキュームレータ、２２・
・・油路、２３・・・アップシフトタイミング制御弁、
２４・・・スプール弁、２５・・・圧縮コイルばね、２
６，２７，２８，２９ａ。２９ｂ、３０．３１・・・ポート、３２・・・絞り、３
３・・・油路、３４・・・サイドポート、３５・・・絞
り、３６・・・圧縮コイルばね、３７・・・弁要素、３
８・・・切欠絞り。FIG. 1 is a hydraulic circuit diagram showing the main parts of one embodiment of the hydraulic control device for an automatic transmission according to the present invention, and FIGS. FIG. 2 is a hydraulic circuit diagram showing essential parts of an embodiment of the present invention. 1...Second brake, 2...Direct clutch, 3...2-3 speed change valve, 4...Spool valve, 5
...Line hydraulic supply port, 6...Boat for 2nd speed, 7...Drain port, 8...Port for 3rd speed,
9...Drain port, 10...Aperture, 11...
One-way valve, 12...oil passage, 13...throttle, 14...
・One-way valve, 15... Oil path, 16... Accumulator, 17... Back pressure chamber, 18... Compression coil spring,
19... Accumulator chamber, 20... Accumulator piston, 21... Accumulator, 22...
...Oil passage, 23...Upshift timing control valve,
24... Spool valve, 25... Compression coil spring, 2
6, 27, 28, 29a. 29b, 30.31...Port, 32...Aperture, 3
3... Oil passage, 34... Side port, 35... Throttle, 36... Compression coil spring, 37... Valve element, 3
8... Notch aperture.

Claims

[Scope of utility model registration request]

A hydraulic control device for an automatic transmission that includes a frictional engagement device for a low gear and a frictional engagement device for a high gear, and switches gears by switching the engagement of these two frictional engagement devices. ,
A first switching position in which the low-speed friction engagement device is connected to the line oil pressure supply oil passage and the high-speed friction engagement device is connected to the drain oil passage, and the high-speed friction engagement device is connected to the line oil pressure a speed change valve that is connected to the supply oil passage and is switched between a second switching position that connects the low gear friction engagement device to the drain oil passage; the low gear friction engagement device and the high gear gear; an accumulator for a low gear and an accumulator for a high gear which are respectively connected to the hydraulic pressure supply path of the frictional engagement device for the low gear when the hydraulic pressure of the frictional engagement device for the high gear is less than a predetermined value. The flow resistance applied to the drain oil passage of the low speed gear friction engagement device is increased, and when the oil pressure of the high speed gear friction engagement device is equal to or higher than a predetermined value, the flow resistance applied to the drain oil passage of the low speed gear friction engagement device is decreased. an upshift timing control circuit that connects the low speed accumulator directly to the drain oil path only when the oil pressure of the friction engagement device is above a predetermined value and the oil pressure of the low speed friction engagement device is above a predetermined value; It has an automatic transmission hydraulic control device.