JPS63138246U

JPS63138246U -

Info

Publication number: JPS63138246U
Application number: JP3123387U
Authority: JP
Priority date: 1987-03-04
Filing date: 1987-03-04
Publication date: 1988-09-12

Description

[Brief explanation of the drawing]

第１図は第２図の装置を作動させるための油圧
制御装置を詳細に示す回路図である。第２図は本
考案が適用された車両の動力伝達装置を示す骨子
図である。第３図は第２図の装置における副変速
機のレンジと摩擦係合装置との関係を示す図であ
る。第４図は第２図の装置に設けられた制御回路
を示すブロツク線図である。第５図は第２図にお
いて急減速弁が非作動状態であるときの第１ライ
ン油圧の変化特性図である。第６図は第２図にお
いて急減速弁が作動状態であるときの第１ライン
油圧の変化特性図である。第７図は第１図の変速
制御用第１電磁弁および第２電磁弁の作動状態と
、ＣＶＴのシフト状態、第１制御油路内油圧、お
よび第２制御油路内油圧との関係を示す図である
。第８図および第９図は第２図の装置の作動をそ
れぞれ説明するフローチヤートである。第１０図
および第１１図は本考案の他の実施例における急
減速弁をそれぞれ示す図である。１２：ＣＶＴ（ベルト式無段変速機）、１４４
：第１電磁弁、１４５：第１制御油路、１４８：
第２電磁弁、１４９：第２制御油路、２２０：急
減速弁、２２２：スプール弁子。 FIG. 1 is a detailed circuit diagram of a hydraulic control system for operating the device of FIG. 2. FIG. 2 is a schematic diagram showing a power transmission device for a vehicle to which the present invention is applied. FIG. 3 is a diagram showing the relationship between the range of the sub-transmission and the frictional engagement device in the device of FIG. 2. FIG. 4 is a block diagram showing a control circuit provided in the apparatus of FIG. 2. FIG. 5 is a characteristic diagram of changes in the first line oil pressure when the rapid deceleration valve is in an inoperative state in FIG. 2. FIG. 6 is a characteristic diagram of changes in the first line oil pressure when the rapid deceleration valve is in the operating state in FIG. 2. FIG. 7 shows the relationship between the operating states of the first and second solenoid valves for speed change control in FIG. 1, the shift state of the CVT, the oil pressure in the first control oil passage, and the oil pressure in the second control oil passage. FIG. 8 and 9 are flowcharts respectively illustrating the operation of the apparatus of FIG. 2. FIG. 10 and FIG. 11 are diagrams showing a rapid deceleration valve in another embodiment of the present invention, respectively. 12: CVT (belt type continuously variable transmission), 144
: first solenoid valve, 145: first control oil path, 148:
2nd solenoid valve, 149: 2nd control oil path, 220: rapid deceleration valve, 222: spool valve.

Claims

[Claims for Utility Model Registration] A vehicle belt system in which power is transmitted via a transmission belt wound between a pair of variable pulleys, and the effective diameter of the variable pulley is changed by a pair of hydraulic actuators. In the continuously variable transmission, the gear ratio is changed by a shift direction switching valve that supplies hydraulic oil to one of the hydraulic actuators or discharges the hydraulic oil from the hydraulic actuator, and changes the flow rate of the hydraulic oil. A hydraulic control device in which a gear ratio changing speed is controlled by a gear change speed control valve, and a line hydraulic pressure supplied to the other of the hydraulic actuators is regulated by a line hydraulic pressure regulating valve, wherein the line hydraulic pressure in one of the hydraulic actuators is The hydraulic oil is released directly to a drain without going through the speed change direction switching valve and the speed change speed control valve to rapidly change the speed ratio, and is also supplied to the line oil pressure regulating valve to lower the line oil pressure by a predetermined pressure. a rapid deceleration valve having a single spool valve that prevents the supply of signal hydraulic pressure acting in the direction; and a control hydraulic pressure applied to the valves for switching the transmission directional control valve and the transmission speed control valve; A hydraulic control device for a belt-type continuously variable transmission for a vehicle, comprising: a pair of control oil passages leading to the spool valve element of the rapid deceleration valve to drive the spool valve element.