JPH03126295U

JPH03126295U -

Info

Publication number: JPH03126295U
Application number: JP3538190U
Authority: JP
Priority date: 1990-03-30
Filing date: 1990-03-30
Publication date: 1991-12-19
Anticipated expiration: 2005-03-30
Also published as: JPH084232Y2

Description

[Brief explanation of drawings]

第１図乃至第８図はこの考案の一実施例を示し
、第１図は油圧作動機の一部切欠正面図、第２図
は第１図のＡ−Ａ線側面図、第３図は油圧作動機
の要部縦断面図、第４図は第３図のＢ−Ｂ線断面
図、第５図は第４図のＣ−Ｃ線断面図、第６図は
第５図のＤ−Ｄ線断面図、第７図は作動状態を示
すバルブ室部分の断面図、第８図ａ，ｂは使用状
態を示す工具部分の縦断面図である。１……油圧作動機、４……電動機、１０……単
動シリンダ、１１……シリンダ本体、１２……加
圧室、１３……ピストン、１４……ピストンロツ
ド、１５……戻しばね、１６……低圧室、２０…
…工具、２１……くさび具、２３……押圧片、２
４……保持体、３９……吸油口、４２……油圧ポ
ンプ、４３……圧油供給路、４５……第１油槽、
４６……第２油槽、５１……バルブ室、５１ａ…
…一端部、５１ｂ……他端部、５２……プラグ、
５３……主弁体、５３ａ……つば部、５３ｂ……
内径部、５４……主ばね、５５……突軸、５６…
…弁座、５８……副弁体、５９……副ばね、６０
……給排油路、６１……通油孔。 Figures 1 to 8 show an embodiment of this invention, with Figure 1 being a partially cutaway front view of the hydraulic actuator, Figure 2 being a side view taken along line A-A in Figure 1, and Figure 3 being a side view of the hydraulic actuator. 4 is a sectional view taken along line B-B in FIG. 3, FIG. 5 is a sectional view taken along line C-C in FIG. 4, and FIG. 6 is a sectional view taken along line D-- in FIG. 5 of the hydraulic actuator. FIG. 7 is a sectional view of the valve chamber portion showing the operating state, and FIGS. 8a and 8b are longitudinal sectional views of the tool portion showing the operating state. DESCRIPTION OF SYMBOLS 1... Hydraulic actuator, 4... Electric motor, 10... Single acting cylinder, 11... Cylinder body, 12... Pressurizing chamber, 13... Piston, 14... Piston rod, 15... Return spring, 16... ...Low pressure chamber, 20...
...Tool, 21...Wedge tool, 23...Press piece, 2
4...Holding body, 39...Oil suction port, 42...Hydraulic pump, 43...Pressure oil supply path, 45...First oil tank,
46...Second oil tank, 51...Valve chamber, 51a...
...One end, 51b...Other end, 52...Plug,
53...Main valve body, 53a...Brim part, 53b...
Inner diameter part, 54... Main spring, 55... Protruding shaft, 56...
...Valve seat, 58...Sub-valve body, 59...Sub-spring, 60
...Oil supply and drainage path, 61...Oil hole.

Claims

[Scope of utility model registration request]

A single-acting cylinder housing a piston for driving a tool, a return spring for returning the piston, and a hydraulic pump having a discharge side connected to a pressurizing chamber of the single-acting cylinder and a suction side connected to an oil tank. In the hydraulic actuator in which the low pressure chamber of the single-acting cylinder is communicated with the atmosphere, a cylindrical valve opening at one end is provided in a valve chamber whose pressure oil supply path connected to the hydraulic pump is open at one end. A main valve body is slidably fitted, a protruding shaft that can be fitted and removed from the inner diameter of the main valve body is provided protruding from the one end of the valve chamber, and an exhaust shaft is provided at the other end of the valve chamber. A valve seat is provided that communicates with the oil tank via an oil flow path, and has an engagement piece that engages with the main valve body when the main valve body moves toward the protruding shaft, so that the valve seat can freely approach and separate from the valve seat. A sub-valve body is slidably attached to the main valve body, and a main spring is installed between the main valve body and the wall surface of the valve chamber to bias the main valve body toward the protruding shaft side. , an auxiliary spring is installed between the main valve element or the protruding shaft and the auxiliary valve element to bias the auxiliary valve element toward the valve seat, and an opening is provided in the valve chamber at a position closer to the valve seat. an oil supply and discharge passage connected to the pressurizing chamber of the single-acting cylinder, and an oil passage hole that communicates the inner diameter portion of the main valve body with the oil supply and discharge passage. Features a hydraulic actuator.