JPH0460775U

JPH0460775U -

Info

Publication number: JPH0460775U
Application number: JP10389290U
Authority: JP
Priority date: 1990-10-01
Filing date: 1990-10-01
Publication date: 1992-05-25

Description

[Brief explanation of the drawing]

第１，２図は本考案の一実施例としての前後輪
操舵式車両における後輪操舵用シリンダロツク装
置を示すもので、第１図はその模式的断面図、第
２図はその変形例を示す模式的断面図であり、第
３〜９図は従来の前後輪操舵車両を示すもので、
第３図はその操舵系を示す模式的斜視図、第４図
はその操舵系の油圧回路図、第５図ａ，ｂ，ｃは
いずれもその車輪の状態を示す模式図、第６図ａ
，ｂはいずれもその運転状態を示す模式的斜視図
、第７図はそのロツク機構の模式的平面図、第８
図はそのロツク機構の模式的正面図、第９図は第
８図の−矢視断面図である。１ａ，１ｂ……前輪、２ａ，２ｂ……後輪、３
，３′……ステアリングホイール、３ａ……操作
部、４……リンク機構、５……リンク、６……フ
ロントアクスル、７ａ，７ｂ……シリンダ、８…
…油圧源、９……電磁弁、１０……リヤアクスル
、１１……リンク機構、１２ａ，１２ｂ……シリ
ンダ、１３……電磁弁、１４……レバー、１４ａ
……孔、１５……シリンダ、１５ａ……ロツド、
１６……シリンダ、１６ａ……シリンダ末端部、
１６ｃ，１６ｄ……オイルシール、１７……孔、
１８……ロツクピンとしてのロツド、１９……ロ
ツド、２０，２０′……ピストン、２０ａ，２０
ｂ……オイルシール、２１……リンク部材、２１
ａ……嵌合溝、２２……ナツト、２３……ピスト
ン、２４……スプリング、２５，２６……オイル
シール、Ｒ，Ｒ′……ロツク機構、ＳＦ……前輪
用操舵機構、ＳＲ……後輪用操舵機構。 Figures 1 and 2 show a cylinder lock device for steering rear wheels in a front and rear wheel steering vehicle as an embodiment of the present invention. FIGS. 3 to 9 show a conventional front and rear wheel steering vehicle, and FIGS.
Figure 3 is a schematic perspective view showing the steering system, Figure 4 is a hydraulic circuit diagram of the steering system, Figures 5a, b, and c are schematic diagrams showing the state of the wheels, Figure 6a
, b are schematic perspective views showing their operating states, FIG. 7 is a schematic plan view of the locking mechanism, and FIG.
The figure is a schematic front view of the locking mechanism, and FIG. 9 is a sectional view taken along the - arrow in FIG. 1a, 1b...Front wheel, 2a, 2b...Rear wheel, 3
, 3'...Steering wheel, 3a...Operation unit, 4...Link mechanism, 5...Link, 6...Front axle, 7a, 7b...Cylinder, 8...
... Hydraulic power source, 9 ... Solenoid valve, 10 ... Rear axle, 11 ... Link mechanism, 12a, 12b ... Cylinder, 13 ... Solenoid valve, 14 ... Lever, 14a
...hole, 15 ... cylinder, 15a ... rod,
16... Cylinder, 16a... Cylinder end part,
16c, 16d...oil seal, 17...hole,
18... Rod as lock pin, 19... Rod, 20, 20'... Piston, 20a, 20
b...Oil seal, 21...Link member, 21
a... Fitting groove, 22... Nut, 23... Piston, 24... Spring, 25, 26... Oil seal, R, R'... Lock mechanism, SF... Front wheel steering mechanism, SR... Steering mechanism for rear wheels.

Claims

[Scope of Claim for Utility Model Registration] (1) In a front and rear wheel steering vehicle comprising a front wheel and a front wheel steering mechanism, and a rear wheel and a rear wheel steering mechanism, the rear wheel steering mechanism comprises a rear axle and a rear wheel steering mechanism. a hydraulic cylinder interposed between the rear axle and the rear wheels to swing the rear wheels relative to the rear axle, and to inhibit operation of the rear wheel steering mechanism when necessary; A cylinder locking device for rear wheel steering in a front and rear wheel steering vehicle, characterized in that a locking mechanism capable of fixing the outer cylinder portion and the rod is attached to the hydraulic cylinder. (2) The locking mechanism includes a locking pin that can protrude into the cylinder by penetrating the outer cylinder of the hydraulic cylinder, and the locking pin engages in an engaging recess with a piston connected to the rod. By doing so,
2. A cylinder locking device for rear wheel steering in a front and rear wheel steering vehicle according to claim 1, characterized in that the cylinder lock device is configured to fix the outer cylindrical portion of the hydraulic cylinder and the rod. (3) The inner length of the outer cylinder part of the piston is set so as to close the protruding position of the lock pin even if the piston with the rod moves to the end inside the outer cylinder part. A cylinder lock device for rear wheel steering in a front and rear wheel steering vehicle according to claim 2.