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Actuator using fluid cylinder, method of controlling the actuator, and choke valve devices

外国特許コード F110003532
整理番号 B26-01WO
掲載日 2011年6月28日
出願国 アメリカ合衆国
出願番号 59571204
公報番号 20070039458
公報番号 7392734
出願日 平成16年11月8日(2004.11.8)
公報発行日 平成19年2月22日(2007.2.22)
公報発行日 平成20年7月1日(2008.7.1)
国際出願番号 JP2004016553
国際公開番号 WO2005045257
国際出願日 平成16年11月8日(2004.11.8)
国際公開日 平成17年5月19日(2005.5.19)
優先権データ
  • 特願2003-379205 (2003.11.7) JP
  • 2004WO-JP16553 (2004.11.8) WO
発明の名称 (英語) Actuator using fluid cylinder, method of controlling the actuator, and choke valve devices
発明の概要(英語) (US7392734)
The present invention provides an actuator using a fluid cylinder capable of imparting stiffness to a fluid cylinder such as an air cylinder with a simple constitution, a control method thereof and a choke valve device.
The actuator is provided with a fluid cylinder 1 , a first choke valve device 3 and a second choke valve device 5 .
The fluid cylinder 1 has a cylinder chamber 7 and a piston 12 dispose slidably in the cylinder chamber 7 so as to partition the cylinder chamber 7 into a first chamber 9 and a second chamber 11 .
The first choke valve device 3 is disposed between a fluid pressure source and the first chamber 9; and the second choke valve device 5 is disposed between the fluid pressure source and the second chamber 11 .
Each of the choke valve devices 3 and 5 is provided with a discharge valve mechanism capable of changing the opening of the valve.
特許請求の範囲(英語) [claim1]
1. An actuator using a fluid cylinder, comprising: a fluid cylinder having a cylinder chamber and a piston slidably disposed in the cylinder chamber so as to partition the cylinder chamber into a first chamber and a second chamber;
a first choke valve device disposed between a fluid pressure source and the first chamber to adjust a fluid pressure in the first chamber;
and
a second choke valve device disposed between the fluid pressure source and the second chamber to adjust a fluid pressure in the second chamber,each of the first choke valve device and the second choke valve device including a supply valve mechanism that permits the fluid to flow in the input direction from the fluid pressure source to the corresponding chamber and a discharge valve mechanism that permits the fluid to flow in the output direction from the chamber to the fluid pressure source, at least the discharge valve mechanism being capable of varying the opening of the valve,wherein both of the supply valve mechanism and the discharge valve mechanism are constructed within a hybrid valve mechanism that comprises a pressure control valve mechanism;
a one-way valve mechanism that permits the fluid to flow only in the input direction from the fluid pressure source to the corresponding chamber side through the pressure control valve mechanism;
and a two-way valve mechanism that permits the fluid to flow in the two directions;
i.e., in the input direction from the fluid pressure source to the chamber through the pressure control valve mechanism and in the output direction from the chamber to the fluid pressure source, the two-way valve mechanism being arranged so that the opening of the valve can be varied depending on the pressure of the fluid supplied from the fluid pressure source.
[claim2]
2. A control method of an actuator using a fluid cylinder set forth in claim 1, wherein, when the position of the piston in the fluid cylinder is shifted by positively supplying the fluid through one of the first and second choke valve devices from the fluid pressure source into the cylinder chamber, the flow rate of the fluid toward the output direction of the two-way-valve mechanism in the discharge valve mechanism of each of the first and second choke valve devices is restricted and thereby the mobility of the piston of the fluid cylinder due to the external force or the stiffness of the fluid cylinder is determined.
[claim3]
3. A control method of an actuator using a fluid cylinder set forth in claim 1, wherein, when the position of the piston in the fluid cylinder is shifted by positively supplying the fluid through one of the first and second choke valve devices from the fluid pressure source into the cylinder chamber, the flow rate of the fluid toward the output direction of the two-way-valve mechanism in the discharge valve mechanism of each of the first and second choke valve devices is restricted and thereby the mobility of the piston of the fluid cylinder due to the external force or the stiffness of the fluid cylinder is determined.
[claim4]
4. A control method of an actuator using a fluid cylinder set forth in claim 3, wherein the fluid is positively supplied from the fluid pressure source to the choke valve device to shift the piston section provided to the rod to positively close the through hole of the restriction member with the moving needle, thereby the piston of the fluid cylinder is stopped.
[claim5]
5. The actuator using a fluid cylinder according to claim 1, wherein the two-way valve mechanism comprises: a rod equipped with a moving needle;
a restriction member that has a through hole through which the moving needle movably penetrates and with which the flow rate of the fluid passing through the through hole is controlled depending on the position of the moving needle;a spring member that constantly applies an energizing force to the rod for shifting the moving needle in the direction that the fluid passing through the through hole increases;
and
a fluid-driven rod shifting mechanism that causes the rod to shift against the energizing force of the spring member by means of a pressure of the fluid supplied from the fluid pressure source to shift the moving needle in the direction that the flow rate of the fluid passing through the through hole of the restriction member decreases.
[claim6]
6. The actuator using a fluid cylinder according to claim 5, wherein each of the first and second choke valve devices includes: a device body having a first connection port connected to the corresponding chamber, a second connection port, which is connected to the fluid pressure source and an inner flow path positioned between the first connection port and the second connection port through which the fluid flows, anda spring member mounting structure for mounting the spring member to the device body,wherein the restriction member and a part of the rod equipped with the moving needle are disposed within the inner flow path of the device body, andwherein a valve of the one-way valve mechanism is provided to a peripheral portion of the restriction member, the valve being positioned between an inner wall portion of the device body enclosing the inner flow path and the peripheral portion and operating by means of the inner wall portion as the valve seat.
[claim7]
7. The actuator using a fluid cylinder according to claim 6, wherein, the fluid-driven rod shifting mechanism comprises a cylinder section communicated with the inner flow path formed within the device body and a piston section provided to the rod, the piston section sliding in the cylinder section, and wherein the spring member mounting structure is structured so that the energizing force of the spring member works on the outer portion of the rod extending from the cylinder section.
[claim8]
8. The actuator using a fluid cylinder according to claim 7, wherein the second connecting port is disposed so as to be communicated with the flow path positioned between the restriction member and the cylinder section.
[claim9]
9. The actuator using a fluid cylinder according to claim 7, wherein the spring member is comprised of a coil spring member disposed in a compressed state and has the internal end at the device body side and the external end at the external end side of the rod, and wherein the spring member mounting structure includes a cylindrical member that is positioned inside the coil spring member and fixed to the outer portion of the rod and moves along with the rod, and is the cylindrical member being provided with an engaging portion to be engaged with the internal end of the coil spring member, and a spring member intermediate portion holding structure that is positioned at the outer side of the cylindrical member, and is arranged so as not to shift with respect to the device body and so as to hold an intermediate portion of the coil spring member, andwherein the spring member intermediate portion holding structure is constructed in such a manner that the number of turns within a section in the coil spring member which is held between the engaging portion and the structure can be changed by varying the holding position of the intermediate portion of the coil spring member, the section of the coil spring member acting as a compressed spring.
[claim10]
10. The actuator using a fluid cylinder according to claim 9, wherein the spring member intermediate portion holding structure has a wedge member inserted between neighboring two turn portions of the coil spring member, and the wedge member is disposed so as to allow the coil spring member to be rotated on the cylindrical member.
[claim11]
11. A choke valve device suitable for being used as a first choke valve device or a second choke valve device of an actuator comprising a fluid cylinder that has a cylinder chamber and a piston disposed slidably in the cylinder chamber so as to partition the cylinder chamber into a first chamber and a second chamber, the first choke valve device disposed between a fluid pressure source and the first chamber for adjusting the fluid pressure within the first chamber;
and
the second choke valve device disposed between the fluid pressure source and the second chamber for adjusting the fluid pressure within the first chamber comprises;a one-way valve mechanism that permits the fluid to flow only in the input direction from the fluid pressure source to the corresponding chamber side, anda two-way valve mechanism that permits the fluid to flow in the two directions;
i.e., in the input direction from the fluid pressure source to the chamber and in the output direction from the chamber to the fluid pressure source side,wherein the two-way valve mechanism comprises:a rod equipped with a moving needle;a restriction member that has a through hole through which the moving needle movably penetrates, and with which the flow rate of the fluid passing through the through hole is controlled depending on the position of the moving needle;a spring member that constantly applies an energizing force to the rod for shifting the moving needle in the direction that the fluid passing through the through hole increases;a fluid-driven rod shifting mechanism that causes the rod to shift against the energizing force of the spring member by means of the pressure of the fluid supplied from the fluid pressure source to shift the moving needle in the direction that the flow rate of the fluid passing through the through hole of the restriction member decreases;
and
a spring member mounting structure capable of adjusting the number of turns within a section in the spring member which functions as a compressed spring.
  • 発明者/出願人(英語)
  • KAWABUCHI ICHIRO
  • HOSHINO KIYOSHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) SORST Selected in Fiscal 2001
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