JPH0219668U

JPH0219668U -

Info

Publication number: JPH0219668U
Application number: JP10047088U
Authority: JP
Priority date: 1988-07-27
Filing date: 1988-07-27
Publication date: 1990-02-08

Description

[Brief explanation of drawings]

第１図は本考案の、負荷検出手段を備えた複動
油圧シリンダの一実施例の説明である。シリンダ；１、ピストン；２、ピストンロツド
；３、ピストンロツド側油室；６、反ピストンロ
ツド側油室；７、給排油路；４，５、パイロツト
逆止弁；９、ルーズな連結手段；１１、負荷検出
手段；１０。 FIG. 1 is an illustration of an embodiment of a double-acting hydraulic cylinder equipped with load detection means according to the present invention. Cylinder; 1. Piston; 2. Piston rod; 3. Piston rod side oil chamber; 6. Opposite piston rod side oil chamber; 7. Oil supply and drainage passage; 4, 5. Pilot check valve; 9. Loose connection means; 11. Load detection means; 10.

Claims

[Scope of utility model registration request]

A cylinder, a piston fitted into the cylinder in an oil-tight and slidable manner, and a piston rod whose base end is connected to the piston and whose tip extends out of the cylinder in an oil-tight and slidable manner. The cylinder, in particular, its piston rod side oil chamber and anti-piston rod side oil chamber are respectively connected to a four-way three-position hydraulic switching valve via oil supply and drainage passages, and to the oil supply and drainage passage connected to the anti-piston rod side oil chamber, The flow of hydraulic oil in the direction of the oil chamber on the side opposite to the piston rod is free, but the flow of hydraulic oil in the opposite direction is possible only when the oil pressure in the oil supply and drain passage connected to the oil chamber on the piston rod side exceeds a predetermined value. A pilot check valve or a counterbalance valve is interposed therebetween, and the load detecting means detects the load acting on the double-acting hydraulic cylinder using the hydraulic pressure in at least the oil chamber on the side opposite to the piston rod as a detection medium. The pilot check valve or counterbalance valve is provided at the end of the cylinder opposite to the piston rod, and the pilot check valve or counterbalance valve and the piston extend into the oil chamber on the opposite piston rod side. A double-acting hydraulic cylinder equipped with a load detecting means, characterized in that the double-acting hydraulic cylinder is connected by a loose connecting means that opens the pilot check valve or the counterbalance valve when the double-acting hydraulic cylinder is in the vicinity of its maximum extension state.