JPH02130401U

JPH02130401U -

Info

Publication number: JPH02130401U
Application number: JP3936689U
Authority: JP
Priority date: 1989-04-03
Filing date: 1989-04-03
Publication date: 1990-10-26
Anticipated expiration: 2004-04-03
Also published as: JPH0749041Y2

Description

[Brief explanation of drawings]

第１図〜第４図は本考案の実施例を示すもので
、第１図はピストンが後退限位置にあるときの油
圧ポンプの縦断面図、第２図はピストンが進出限
位置にあるときの油圧ポンプの縦断面図、第３図
は制御弁機構の変形例を示す油圧ポンプの部分縦
断面図、第４図は切換弁機構の変形例を示す油圧
ポンプの部分縦断面図、第５図は従来技術に係る
往復動アクチユエータの要部縦断面図である。ＡＣ……往復動アクチユエータ、３……加圧エ
ア供給口、５……排気室、１０……ハウジング、
２０……複動エアシリンダ、２２……ピストン、
２３……出力ロツド、２５……往動作動室、２６
……復動作動室、３０……切換弁機構、３５，３
５Ｂ……切換弁体、４９……スプリング、５０…
…弁作動室、６０，６０Ａ……制御弁機構、６１
……弁部材。 Figures 1 to 4 show embodiments of the present invention. Figure 1 is a vertical cross-sectional view of the hydraulic pump when the piston is at the retraction limit position, and Figure 2 is a longitudinal cross-sectional view of the hydraulic pump when the piston is at the extension limit position. 3 is a partial vertical sectional view of the hydraulic pump showing a modification of the control valve mechanism; FIG. 4 is a partial vertical sectional view of the hydraulic pump showing a modification of the switching valve mechanism; FIG. The figure is a vertical cross-sectional view of a main part of a reciprocating actuator according to the prior art. AC... Reciprocating actuator, 3... Pressurized air supply port, 5... Exhaust chamber, 10... Housing,
20...Double acting air cylinder, 22...Piston,
23...Output rod, 25...Forward motion chamber, 26
... Double action chamber, 30 ... Switching valve mechanism, 35, 3
5B...Switching valve body, 49...Spring, 50...
...Valve operating chamber, 60, 60A... Control valve mechanism, 61
...Valve member.

Claims

[Claims for Utility Model Registration] A fluid pressure cylinder having a piston and an output rod fixed to the piston is provided in the housing, and the fluid pressure cylinder is provided with a forward movement chamber for driving the piston forward using at least fluid pressure. , a switching valve body provided with a return means for driving the piston backward, and selectively switched between a supply position in which the forward motion chamber is connected to a fluid pressure supply port and a discharge position in which it is connected to a discharge port; A switching valve mechanism is provided that includes a biasing means for biasing the valve body to the supply position and a valve operating chamber that resists the biasing force and switches the switching valve body to the discharge position using fluid pressure, and extends from the piston to switch the switching valve. When the piston is at the retraction limit position, the valve operation chamber is connected to the discharge port via the valve member inserted through the valve body, and when the piston is between the retraction limit position and the extension limit position, the valve operation chamber is connected to the discharge port. In a fluid pressure driven continuous reciprocating actuator that is sealed and is provided with a control valve mechanism that connects the valve operating chamber to the fluid pressure supply port when the piston is at the advanced limit position, the biasing means is a compression coil spring. A fluid pressure driven continuously operating reciprocating actuator characterized by comprising: