JPS6445578U

JPS6445578U -

Info

Publication number: JPS6445578U
Application number: JP14179687U
Authority: JP
Priority date: 1987-09-17
Filing date: 1987-09-17
Publication date: 1989-03-20
Anticipated expiration: 2002-09-17
Also published as: JPH0611875Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る４輪操舵装置の一実施例
を示し、同装置の回路構成を示す油圧回路図、第
２図は第１図に示す矢線−に沿う断面図、第
３図乃至第５図は油圧制御弁装置７の作動説明図
である。１……後輪、２……パワーシリンダ、４……サ
ーボバルブ、６……オイルポンプ、７……油圧制
御弁装置、７Ａ……左圧力室（第１の圧力室）、
７Ｂ……右圧力室（第２の圧力室）、７Ｃ……左
圧力室（第３の圧力室）、７Ｄ……右圧力室（第
４の圧力室）、７ａ……ピストン室、７ｂ……ピ
ストン室、２０……車速感応アクチユエータ、８
……油圧アクチユエータ、３２，３４……油路、
７１……ピストン（第１のピストン）、７２……
ピストン（第２のピストン）、７５……リンク機
構。 Fig. 1 shows an embodiment of the four-wheel steering device according to the present invention, and is a hydraulic circuit diagram showing the circuit configuration of the device, Fig. 2 is a sectional view taken along the arrow line - shown in Fig. 1, and Fig. 3 5 to 5 are explanatory views of the operation of the hydraulic control valve device 7. 1... Rear wheel, 2... Power cylinder, 4... Servo valve, 6... Oil pump, 7... Hydraulic control valve device, 7A... Left pressure chamber (first pressure chamber),
7B... Right pressure chamber (second pressure chamber), 7C... Left pressure chamber (third pressure chamber), 7D... Right pressure chamber (fourth pressure chamber), 7a... Piston chamber, 7b... ...Piston chamber, 20...Vehicle speed sensitive actuator, 8
... Hydraulic actuator, 32, 34 ... Oil passage,
71... Piston (first piston), 72...
Piston (second piston), 75... link mechanism.

Claims

[Scope of utility model registration request]

The hydraulic control valve device includes a hydraulically actuated device that steers a rear wheel, and a hydraulic control valve device that controls the supply of hydraulic fluid to the hydraulically actuated device, and the hydraulically controlled valve device includes first and second variable capacity piston chambers, and a piston mechanism that changes the capacity of each piston chamber in conjunction with each other according to the vehicle speed; a first piston that partitions the second piston chamber into a pressure chamber and a second pressure chamber; a second piston that partitions the second piston chamber into a third pressure chamber and a fourth pressure chamber; A first oil passage that connects the chamber and a fourth pressure chamber and is connected to the hydraulically actuated device, and a first oil passage that connects the second pressure chamber and the third pressure chamber and is connected to the hydraulically actuated device. The first and second pistons each change the piston area as the capacity of the corresponding piston chamber changes, and the first piston changes the piston area as the capacity of the corresponding piston chamber changes. When the second piston moves in the direction of increasing the capacity and decreasing the capacity of the second pressure chamber, the second piston increases the capacity of the third pressure chamber and decreases the capacity of the fourth pressure chamber. When the first piston moves in the direction of decreasing the capacity of the first pressure chamber and increasing the capacity of the second pressure chamber, the second piston increases the capacity of the third pressure chamber. The four wheels move in a direction to decrease the capacity of the fourth pressure chamber and increase the capacity of the fourth pressure chamber, and the first and second pistons move in conjunction with each other according to the handle angle. Steering device.