JPS6366602U

JPS6366602U -

Info

Publication number: JPS6366602U
Application number: JP7787387U
Authority: JP
Priority date: 1987-05-22
Filing date: 1987-05-22
Publication date: 1988-05-06

Description

[Brief explanation of the drawing]

第１図は、従来のロータリアクチユエータの断
面図を含む油圧回路図、第２図は本考案の一実施
例であるロータリアクチユエータの正面図、第３
図は同側断面図（ヨークが最も右側へストローク
した状態を示す）、第４図は第３図におけるＡ―
Ａ矢視断面図、第５図は同実施例に用いることの
できるピストンの斜視図である。符号の説明、２６……シリンダ、２９……内壁
、３０……シール部材、３１……ピストン、４０
……トラニオンピン、４１……駆動軸、４５……
ヨーク、４６……ヨーク溝、Ｊ……シリンダ（及
びピストンの軸芯）、３６，３７……中間リブ、
ｗ……中間部。 FIG. 1 is a hydraulic circuit diagram including a cross-sectional view of a conventional rotary actuator, FIG. 2 is a front view of a rotary actuator that is an embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the same side (showing the state in which the yoke has been stroked to the rightmost side), and Figure 4 is A-- in Figure 3.
A sectional view taken along arrow A and FIG. 5 are perspective views of a piston that can be used in the same embodiment. Explanation of symbols, 26... Cylinder, 29... Inner wall, 30... Seal member, 31... Piston, 40
...Trunion pin, 41...Drive shaft, 45...
Yoke, 46... Yoke groove, J... Cylinder (and piston axis), 36, 37... Intermediate rib,
lol...middle part.

Claims

[Scope of utility model registration request]

A rotary actuator that does not require a piston rod converts the linear motion of a piston that reciprocates while sliding against the inner wall of the cylinder into the rotational motion of a yoke and a drive shaft attached to the yoke. The trunnion pin attached to the intermediate rib and the drive shaft connected to the butterfly valve are eccentrically moved to the opposite side of the axis of the cylinder. At the same time, the drive shaft is passed through the hollow part of the piston and attached to the cylinder, and a trunnion pin is engaged with a yoke groove of a yoke fixed to the drive shaft, so that the drive shaft is rotated by the reciprocating movement of the piston. Furthermore, the rotary actuator for driving a butterfly valve is characterized in that the length of the yoke is set to such a length that the tip of the yoke does not interfere with the cylinder when the yoke swings, and the cylinder is formed into a straight cylindrical shape.