JPH0293907U

JPH0293907U -

Info

Publication number: JPH0293907U
Application number: JP172989U
Authority: JP
Priority date: 1989-01-11
Filing date: 1989-01-11
Publication date: 1990-07-26

Description

[Brief explanation of drawings]

第１図は本考案のトラクターの油圧昇降装置の
全体斜視図、第２図は同じく平面一部断面図、第
３図は第２図の−矢視断面図、第４図は同じ
く−矢視断面図、第５図は−矢視断面図
、第６図はサイドケース２の右側面図、第７図は
同じく−矢視断面図、第８図は油圧制御バル
ブＶ１の下げ時の側面展開断面図、第９図は同じ
く中立時の側面展開断面図、第１０図は同じくス
ローリターン時の側面展開断面図である。Ｖ１……油圧制御バルブ、Ｖ２，Ｖ３……他の
作業機用切換バルブ、１ｃ……ドラフトバネ室、
１ｄ……サイドケース付設面、２……サイドケー
ス、２ａ……バルブ付設面、３……バルブケース
、５……スローリターン軸、７……下げチエツク
弁、５０……ストツパー。 Fig. 1 is an overall perspective view of a hydraulic lifting device for a tractor according to the present invention, Fig. 2 is a partially sectional plan view, Fig. 3 is a sectional view taken in the direction of - arrow in Fig. 2, and Fig. 4 is a sectional view in the direction - arrow of Fig. 2. 5 is a cross-sectional view taken in the direction of the arrow, FIG. 6 is a right side view of the side case 2, FIG. 7 is a sectional view of the side case 2 in the same direction, and FIG. The cross-sectional view, FIG. 9 is a side developed cross-sectional view at the neutral state, and FIG. 10 is a side developed cross-sectional view at the slow return state. V1...Hydraulic control valve, V2, V3...Switching valve for other working machines, 1c...Draft spring chamber,
1d...Side case attachment surface, 2...Side case, 2a...Valve attachment surface, 3...Valve case, 5...Slow return shaft, 7...Lower check valve, 50...Stopper.

Claims

[Scope of claims for utility model registration] (1) Side case 2 on the side of cylinder case 1
A hydraulic control valve V1 is attached to the inner surface of the side case 2, a valve attachment surface 2a for other work equipment switching valves V2 and V3 is attached to the outer surface, and a slow return valve is attached to the front surface. A hydraulic lifting device for a tractor, which supports a shaft 5 and is characterized in that an oil passage of a hydraulic control valve V1 bored in a side case 2 is connected to an oil passage bored in a side of a cylinder case 1. (2) In the cylinder case 1 according to claim (1), the rear part of the attachment part of the side case 2 is bulged to approximately the width of the side case 2, and the draft spring 1 is installed in the bulge.
A hydraulic lifting device for a tractor, characterized in that 5 is arranged. (3) By rotating the slow return shaft 5 according to claim (1), the opening degree of the downward check valve 7 provided in the hydraulic control valve V1 is limited, and the pressure oil in the cylinder chamber 1b is directed to the tank side. A hydraulic lifting device for a tractor, characterized in that it is configured to adjust the discharge speed.