JPS63100169U

JPS63100169U -

Info

Publication number: JPS63100169U
Application number: JP19473686U
Authority: JP
Priority date: 1986-12-18
Filing date: 1986-12-18
Publication date: 1988-06-29

Description

[Brief explanation of the drawing]

図面は本考案の実施例を示すもので、第１〜５
図は本実施例に係るガス式油圧打撃工具の構成な
らびにその作動用油圧回路を示す図であつて、第
１図は通常時におけるピストン前進状態、第２図
は同じく通常時におけるピストンの後退状態、第
３図は排油路の背圧が高い場合におけるピストン
の前進状態、第４図は同じく背圧が高い場合のピ
ストンの後退状態、第５図は背圧ならびに圧縮気
体圧が低い場合におけるピストンの前進状態を夫
々示す図である。１……シリンダ本体、２……ピストン部材、２
ａ，２ｂ……ピストン部、４……前室、５……後
室、６……ガス室、１０……油圧源、１１……給
油路、１２……排油路、１３……切換バルブ、１
８……連通路、１９……第１バルブ、２０……第
２バルブ、２２……アキユームレータ、２３……
連通路、２４……第３バルブ。 The drawings show embodiments of the present invention.
The figures are diagrams showing the configuration of the gas-type hydraulic impact tool and its operating hydraulic circuit according to the present embodiment, in which FIG. 1 shows the piston in its forward movement state in normal times, and FIG. 2 shows its retracted state in normal times. , Fig. 3 shows the forward movement of the piston when the back pressure in the oil drain passage is high, Fig. 4 shows the retracted state of the piston when the back pressure is also high, and Fig. 5 shows the state when the back pressure and compressed gas pressure are low. It is a figure which shows the forward state of a piston, respectively. 1... Cylinder body, 2... Piston member, 2
a, 2b... Piston part, 4... Front chamber, 5... Rear chamber, 6... Gas chamber, 10... Hydraulic source, 11... Oil supply path, 12... Oil drain path, 13... Switching valve ,1
8... Communication path, 19... First valve, 20... Second valve, 22... Accumulator, 23...
Communication path, 24...third valve.

Claims

[Scope of utility model registration request]

A piston slidably installed inside the cylinder body, a front chamber formed in front of the piston and connected to a hydraulic power source, and a rear chamber formed behind the piston and connected to an oil drain path. a switching valve for at least blocking the oil drain passage and connecting the rear chamber to a hydraulic power source; and a switching valve that is provided at the rear end of the piston in the cylinder body and is filled with compressed gas that is compressed when the piston retreats. In a gas hydraulic impact tool having a gas chamber and an accumulator connected to the gas chamber, a communication passage is provided for releasing the compressed gas in the gas chamber to the atmosphere, and the communication passage is provided with a back pressure of the oil drain passage. A first valve that opens the communication passage when the communication passage is high, and a second valve that opens when the pressure of the compressed gas when the piston retreats in the gas chamber exceeds a predetermined value while the communication passage is open are interposed in series. and on the passage between the gas chamber and the accumulator, when the back pressure of the oil drain passage is low and the pressure of the compressed gas in the gas chamber falls below a predetermined lower limit value, the gas chamber and the accumulator are A gas-type hydraulic impact tool characterized by comprising a third valve communicating with the gas-type hydraulic impact tool.