JPH01136065U

JPH01136065U -

Info

Publication number: JPH01136065U
Application number: JP3020788U
Authority: JP
Priority date: 1988-03-07
Filing date: 1988-03-07
Publication date: 1989-09-18

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例に係る前後輪操舵
車の全体概略図、第２図は同車両の操舵特性図、
第３図は第１実施例の変形例に係る油圧シリンダ
の要部断面図、第４図は本考案の第２実施例に係
る前後輪操舵車の全体概略図、第５図は第４図の
圧力切換え弁の断面図、及び第６図は第４図の油
圧シリンダにおける制御油圧の特性図である。符号の説明、ＦＷ１，ＦＷ２……前輪、ＲＷ１
，ＲＷ２……後輪、Ｐ１〜Ｐ８……導管、１３，
１７……リレーロツド、１６……操舵ハンドル、
２３……油圧シリンダ、２３ｅ……大径部、２５
……チエツク弁、２６……パワーシリンダ、３２
……スプリング、３３ａ，３３ｂ……リテーナ、
３４ａ，３４ｂ，３５ａ，３５ｂ……ストツパ部
、４１ａ，４１ｂ……オリフイス、４２……切換
え弁、５０……圧力切換え弁。 FIG. 1 is an overall schematic diagram of a front and rear wheel steering vehicle according to a first embodiment of the present invention, and FIG. 2 is a diagram of the steering characteristics of the same vehicle.
FIG. 3 is a cross-sectional view of a main part of a hydraulic cylinder according to a modification of the first embodiment, FIG. 4 is an overall schematic diagram of a front and rear wheel steered vehicle according to a second embodiment of the present invention, and FIG. 6 is a sectional view of the pressure switching valve, and FIG. 6 is a characteristic diagram of the control oil pressure in the hydraulic cylinder of FIG. 4. Explanation of codes, FW1, FW2...Front wheel, RW1
, RW2... Rear wheel, P1 to P8... Conduit, 13,
17... Relay rod, 16... Steering handle,
23...Hydraulic cylinder, 23e...Large diameter part, 25
...Check valve, 26 ...Power cylinder, 32
... Spring, 33a, 33b ... Retainer,
34a, 34b, 35a, 35b...stopper portion, 41a, 41b...orifice, 42...switching valve, 50...pressure switching valve.

Claims

[Scope of utility model registration request]

A first hydraulic cylinder whose piston rod is displaced in conjunction with the steering of the front wheels, a second hydraulic cylinder in which a pair of oil chambers each communicate with a pair of oil chambers of the first hydraulic cylinder, and left and right rear wheels are connected so as to be steerable. and a relay rod that is driven by the second hydraulic cylinder to steer the rear wheels, a neutral biasing mechanism that biases the relay rod to a neutral position, and a neutral biasing mechanism that biases the relay rod to a neutral position; a first oil passage that communicates the pair of oil chambers of the first hydraulic cylinder when the hydraulic cylinder is near a neutral position; and a second oil passage that communicates the first oil passage with a reservoir tank that stores hydraulic oil. A rear wheel steering device for a vehicle with front and rear wheel steering, characterized by: