JPH01127637U

JPH01127637U -

Info

Publication number: JPH01127637U
Application number: JP1648188U
Authority: JP
Priority date: 1988-02-10
Filing date: 1988-02-10
Publication date: 1989-08-31
Anticipated expiration: 2003-02-10
Also published as: JPH0644499Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す油圧作動機
の正面図、第２図は同じく要部縦断面図、第３図
は第２図のＡ―Ａ線断面図、第４図は同じくＢ―
Ｂ線断面図、第５図は同じくＣ―Ｃ線断面図、第
６図は第１図の油圧作動機の使用状態を示すジヨ
ー部分の縦断面図、第７図および第８図は主弁体
および副弁体の他の実施態様を示す略示縦断面図
である。１…油圧作動機、３…電動機、６…単動シリン
ダ、１０…クランプジヨー（工具）、３１…油圧
ポンプ、３２…圧油供給路、３３…油槽、３４…
油槽、３５…吸込口、４１…バルブ室、４１ａ…
一端部、４１ｂ…他端部、４２…プラグ、４３…
主弁体、４３ａ…つば部、４３ｂ…内径部、４４
…主ばね、４５…突軸、４６…弁座、４７…排油
流路、４８…副弁体、４８ａ…係合片部、４９…
副ばね、５０…給排油路、５１…通油孔、６１…
シリンダ本体、６１ａ…加圧室、６１ｂ…低圧室
、６２…ピストンロツド、６３…ピストン、６４
…戻しばね、６６…ローラ。 Fig. 1 is a front view of a hydraulic actuator showing an embodiment of this invention, Fig. 2 is a longitudinal cross-sectional view of the main parts, Fig. 3 is a cross-sectional view taken along line A--A in Fig. 2, and Fig. 4 is the same. B-
5 is a sectional view taken along line C-C, FIG. 6 is a longitudinal sectional view of the hydraulic actuator shown in FIG. FIG. 7 is a schematic longitudinal cross-sectional view showing another embodiment of the body and the sub-valve body. DESCRIPTION OF SYMBOLS 1...Hydraulic actuator, 3...Electric motor, 6...Single acting cylinder, 10...Clamp jaw (tool), 31...Hydraulic pump, 32...Pressure oil supply path, 33...Oil tank, 34...
Oil tank, 35... Suction port, 41... Valve chamber, 41a...
One end, 41b...Other end, 42...Plug, 43...
Main valve body, 43a...Brim part, 43b...Inner diameter part, 44
...Main spring, 45...Protruding shaft, 46...Valve seat, 47...Drain oil channel, 48...Sub-valve body, 48a...Engagement piece part, 49...
Sub-spring, 50...Oil supply/drain passage, 51...Oil hole, 61...
Cylinder body, 61a...pressure chamber, 61b...low pressure chamber, 62...piston rod, 63...piston, 64
...Return spring, 66...roller.

Claims

[Scope of utility model registration request]

A single acting cylinder houses a piston fixed to a piston rod for driving a tool and is equipped with a return spring for returning the piston, and the discharge side is connected to a pressurizing chamber of this single acting cylinder, and the suction side is connected to an oil tank. A hydraulic actuator comprising a hydraulic pump and an oil drain passage connecting a low pressure chamber of the single-acting cylinder and the oil tank, wherein the valve opens at one end of the pressure oil supply passage connected to the hydraulic pump. A cylindrical main valve body having an opening at the one end is slidably fitted into the chamber, and a protruding shaft that can be freely fitted and removed from the inner diameter of the main valve body is provided to protrude from the one end of the valve chamber. The other end of the valve chamber is provided with a valve seat that communicates with the oil tank via an oil drain flow path, and a valve seat that engages with the main valve element when the main valve element moves toward the protruding shaft side. A sub-valve body, which is provided with a mating piece and can be freely moved toward and away from the valve seat, is slidably attached to the main valve body, and the main valve body is mounted between the main valve body and the wall surface of the valve chamber. A main spring biasing the protruding shaft side, and a sub spring mounted between the main valve body or the protruding shaft and the sub valve body biasing the sub valve body toward the valve seat side. At the same time, an oil supply and drainage path that opens at a position near the valve seat of the valve chamber,
A hydraulic actuator, characterized in that the main valve body is provided with an oil passage hole that is connected to the pressurizing chamber of the single-acting cylinder and that communicates an inner diameter portion of the main valve body with the oil supply and discharge path.