JPH0449575U

JPH0449575U -

Info

Publication number: JPH0449575U
Application number: JP9281890U
Authority: JP
Priority date: 1990-09-03
Filing date: 1990-09-03
Publication date: 1992-04-27
Anticipated expiration: 2005-04-19
Also published as: JPH0716544Y2

Description

[Brief explanation of the drawing]

第１図は、本考案の操向操作装置を示す全体斜
視図、第２図はバルブケース２とスライドスプー
ル３とピストン４の部分を示す後面断面図、第３
図は操向クラツチ切りを電磁ソレノイドＡにより
自動操作する場合の後面断面図、第４図は操向ク
ラツチ切りをステアリング操作具１により手動に
て行う状態の後面断面図、第５図は操向ブレーキ
作動状態まで至つた場合の後面断面図、第６図は
操向クラツチ切りまでで操向ブレーキ作動までは
至らない状態の後面断面図、第７図はコンバイン
の刈取操向ブレーキ２７に設けた自動操向センサ
ーｓｌ，ｓｒの平面図、第８図は本考案の電磁ソ
レノイドＡ，Ｂの回路図、第９図はミツシヨンケ
ース内の駆動スケルトンを示す図面である。１……ステアリング操作具、２……バルブケー
ス、２Ｌ，２Ｒ……油圧シリンダ室、３Ｌ，３Ｒ
……スライドスプール、４Ｌ，４Ｒ……ピストン
、５Ｌ，５Ｒ……シフター回動アーム、６Ｌ，６
Ｒ……プツシユアーム、Ａ，Ｂ……電磁ソレノイ
ド、ｓｌ，ｓｒ……自動操向センサー、ＦＤ……
分流弁。 FIG. 1 is an overall perspective view showing the steering operation device of the present invention, FIG. 2 is a rear sectional view showing the valve case 2, slide spool 3, and piston 4, and FIG.
The figure is a rear sectional view when the steering clutch is automatically disengaged by electromagnetic solenoid A, FIG. 4 is a rear sectional view when the steering clutch is manually disengaged using the steering operating tool 1, and FIG. Figure 6 is a rear cross-sectional view of the state in which the brake has been activated, Figure 6 is a rear cross-sectional view of the state in which the steering clutch has been disengaged but the steering brake has not yet been activated, Figure 7 is a rear cross-sectional view of the state in which the steering brake has not yet been activated. FIG. 8 is a plan view of the automatic steering sensors sl and sr, FIG. 8 is a circuit diagram of the electromagnetic solenoids A and B of the present invention, and FIG. 9 is a drawing showing the driving skeleton inside the transmission case. 1...Steering operation tool, 2...Valve case, 2L, 2R...Hydraulic cylinder chamber, 3L, 3R
...Slide spool, 4L, 4R...Piston, 5L, 5R...Shifter rotation arm, 6L, 6
R...Push arm, A, B...Electromagnetic solenoid, sl, sr...Automatic steering sensor, FD...
Diversion valve.

Claims

[Scope of Claim for Utility Model Registration] (1) A steering clutch that drives and stops the left and right traveling devices independently, and a steering brake that brakes each of the left and right traveling devices are provided, and the steering clutch and the steering brake are operated by a hydraulic cylinder. In a configuration in which the hydraulic cylinder is operated by extending a piston in the chamber, a drain oil hole is formed in the piston in the hydraulic cylinder chamber, a slide spool is slidably and overlappingly fitted into the drain oil hole, and the slide spool An oil hole is drilled in the hydraulic cylinder for discharging a portion of the pressure oil flowing into the hydraulic cylinder to a drain oil hole, and the steering operating tool for operating the slide spool can be slid in the direction in which the oil hole is closed by the piston. , characterized in that the piston is extended in accordance with the stroke amount until the oil hole is closed by the piston, and the stroke from the steering clutch disengagement stroke to the braking stroke of the steering brake is obtained. Steering control device. (2) In the steering operating device according to claim (1), a push arm that is swung by a steering operating tool contacts and presses the base end of the slide spool and is slidably connected to the other operating tool. Electromagnetic solenoid S・ whose solenoid pin can be freely protruded by
A steering operation device characterized in that a protruding portion of the electromagnetic solenoid S/B is provided at the base end of a slide spool in parallel with the push arm.