JPS61152212U

JPS61152212U -

Info

Publication number: JPS61152212U
Application number: JP3632685U
Authority: JP
Priority date: 1985-03-14
Filing date: 1985-03-14
Publication date: 1986-09-20

Description

[Brief explanation of the drawing]

図面は本考案に係る農用トラクターの油圧装置
の実施例を示し、第１図は乗用型耕耘機後部の斜
視図、第２図は油圧回路図、第３図は制御系のブ
ロツク図、第４図シリンダヘツドの一部切欠き正
面図、第５図はリフトアームシリンダ配設部の一
部切欠き側面図、第６図は第４図の―断面矢
視図、第７図は第４図の―断面矢視図、第８
図は第４図の―断面矢視図、第９図は第４図
の―断面矢視図である。３……作業装置、７……リフトアームシリンダ
、７ａ……ピストンロツド、１０……フロープラ
イオリテイバルブ、１１，１４……制御弁、１８
……ミツシヨンケース、１９……上蓋ケース、２
０……シリンダヘツド、２１，３２，３３，３５
……組付孔、２２……主リリーフバルブ、２３…
…補助リリーフバルブ、２５……セーフテイバル
ブ、Ａ……制御用油圧回路、ａ……制御ポート、
ｌ_２，ｌ_３，ｌ_５……油路、Ｚ……シリンダ軸芯
。 The drawings show an embodiment of the hydraulic system for an agricultural tractor according to the present invention, in which Fig. 1 is a perspective view of the rear part of a riding power tiller, Fig. 2 is a hydraulic circuit diagram, Fig. 3 is a block diagram of the control system, and Fig. 4 is a diagram of the hydraulic system. Fig. 5 is a partially cutaway front view of the cylinder head, Fig. 5 is a partially cutaway side view of the lift arm cylinder installation part, Fig. 6 is a cross-sectional view taken from Fig. 4, and Fig. 7 is a sectional view taken from Fig. 4. - Sectional arrow view, No. 8
The figure is a sectional view taken in the direction of the arrow in FIG. 4, and FIG. 9 is a sectional view taken in the direction of the arrow in FIG. 3... Working device, 7... Lift arm cylinder, 7a... Piston rod, 10... Flow priority valve, 11, 14... Control valve, 18
...Mission case, 19...Top lid case, 2
0...Cylinder head, 21, 32, 33, 35
...Assembly hole, 22...Main relief valve, 23...
... Auxiliary relief valve, 25 ... Safety valve, A ... Control hydraulic circuit, a ... Control port,
l ₂ , l ₃ , l ₅ ... oil path, Z ... cylinder axis.

Claims

[Scope of utility model registration request]

The piston rod 7a of the lift arm cylinder 7 for lifting the attached working device 3 is attached to the transmission case 18.
The cylinder head 20 of the cylinder 7 is detachably attached to the upper lid case 19, and a control valve 11 is provided for the cylinder 7, so that the lift arm cylinder 7 Excess oil from the flow priority valve 10, which supplies a fixed amount of pressure oil from a hydraulic source to the control valve 14 of the hydraulic circuit A for automatic posture control in the attached working device 3 that is lifted and lowered by the lift arm, is transferred to the lift arm cylinder control valve 11. A supply flow path is provided, an auxiliary relief valve 23 for pressure oil supplied from the control port a of the flow priority valve 10 is provided, and the lift arm cylinder 7
This is a hydraulic system for an agricultural tractor in which a safety valve 25 for the lift arm cylinder 7 is installed in the cylinder head 20, and the mounting hole 35 for the safety valve 25 in the cylinder head 20 is arranged so that the depth direction thereof is The auxiliary relief valve 23 is disposed along or almost along the axis Z, and the auxiliary relief valve 23 is fitted and fixed into the assembly hole 33 provided in the cylinder head 20 with the depth direction being along or almost along the cylinder axis Z. a main relief valve 22 for pressure oil supplied from a hydraulic source to the flow priority valve 10;
Each of the flow priority valves 10,
The main relief valve 22 and the flow priority valve 10 are fitted and fixed into the assembly hole (32 or 21) provided in the cylinder head 20 with the depth direction perpendicular or almost perpendicular to the cylinder axis Z. An oil passage (l ₂ ) that communicates with the flow priority valve 10 and an oil passage (l ₃ or l ₅ ) that communicates with each of the control valves 11 and 14 and the auxiliary relief valve 23 are connected to the cylinder head. Hydraulic system of agricultural tractor installed in 20.