JP2011185431A - Wide-angle vane type rocking actuator - Google Patents

Abstract

In a vane type swing actuator that swings an output shaft by supplying and discharging a working fluid to and from a cylinder chamber partitioned by a vane, a swing angle of 180 ° often used in the market is set. Utilizing the compactness that is a feature, instead of using a method of expanding the angle via gears, we offer a compact, high-torque, high-torque, wide-angle vane-type peristaltic actuator with low frictional resistance and excellent durability. To do.
A seal packing 61 integrally formed as a sealing material for partitioning a cylinder chamber is attached to a groove of a vane 6 fitted and fixed to a shaft 5. The character part 61b is mounted in the groove 6b of the vane 6, and the U-shaped part 61a branched into two from the circle-shaped part 61c of the seal packing 61 is mounted in the groove 6a on the short side of the vane 6. Features.
[Selection] Figure 5

Description

  The present invention relates to a vane-type oscillating actuator, and more particularly to a compact, wide-angle vane-type oscillating actuator with excellent sealing performance and low frictional resistance.

2. Description of the Related Art Conventionally, for example, as a vane type swing actuator excellent in compactness, in a fan-shaped vane type swing actuator in which a seal packing is formed on a vane integrally formed on an output shaft of Patent Document 1, In addition, a vane-type oscillating actuator in which a plurality of vertical ridges are formed into a film and a wide swing angle can be obtained is described. Also, with respect to the vane-type oscillating actuator of Patent Document 2, a molded seal packing is attached to the vane. Describes a vane-type peristaltic actuator with significantly reduced leakage.
JP-A-11-93907 JP 2009-243672 A

However, in the vane-type peristaltic actuator disclosed in Patent Document 1, a vane is integrally formed on the output shaft, and further, a synthetic rubber for sealing is formed on the integrally formed output shaft and vane so that the shaft slides on the output shaft in the casing. Since a large number of vertical ridges are formed on the moving portion in the axial direction of the output shaft, wide-angle swinging is possible. However, since the output shaft and vane are formed integrally, and a synthetic rubber film is formed, a complicated dedicated mold is required for the formation, and it is very expensive because it cannot cope with changes in the shape and outer shape of the output shaft. It will be something. Furthermore, since the seal is formed integrally with the vane, it has low adaptability to changes in the load on the seal due to pressure fluctuations, biased load, and peristaltic speed when driving the actuator, resulting in high frictional resistance and durability. In contrast, the wear of the sliding part made of synthetic rubber is shortened, and when it is replaced, there is a waste of replacing both the integrally formed output shaft and the vane. In addition, since the shaft sliding portion of the output shaft in the casing is coated with a number of vertical ridges in the axial direction of the output shaft, the plurality of vertical ridges are sealed and the resistance of the sliding portion is further increased. As a result, there was a problem that low-pressure driving was not possible. Further, in the vane-type peristaltic actuator of Patent Document 2, the sealing performance is greatly improved by attaching the molded seal packing to the vane, there is almost no leakage, the friction resistance is low, the durability is excellent, and the seal packing. When wearing, it is possible to replace only the seal packing and reuse it, but there is a limit to the swing angle, and if the swing angle is 180 °, which is often used in the market, it will be a peristaltic actuator via gears, so the output torque will be There is a problem that the ratio is reduced, the shape is increased, and the cost is increased.
Therefore, there has been a demand for a compact, thin, wide-angle vane-type swing actuator having a long durability and a small frictional resistance and a large swing angle.

  The present invention solves the above-mentioned problems, and is reused by replacing the seal packing with a thin type having excellent durability and small friction, taking advantage of the compactness of the vane-type peristaltic actuator. An object is to provide a possible wide-angle vane-type peristaltic actuator.

  For this purpose, the wide-angle vane type swing actuator according to claim 1 of the present invention is provided with a seal packing in the vicinity of the longitudinal center portion of the shaft in a cylinder chamber in which covers are attached to the upper and lower sides of the body tube having an inner fan shape. The vane is fitted and fixed, and the shaft protrudes from the upper and lower covers. The vane fitted with the seal packing divides the cylinder chamber into left and right chambers, and the vane can swing in the cylinder chamber using the shaft as a fulcrum shaft of the fan by supplying and discharging the working fluid to each of the partitioned cylinder chambers. In this case, the seal packing attached to the vane is made of an elastic body, the shape of the seal between the shaft and the upper and lower covers is a circle shape larger than the outer diameter of the shaft, the main body tube and the vane, and The seal part shape with the upper and lower covers is continuously formed in the circle shape in a U shape, and the seal packing on the fan fulcrum side sliding portion branches into two U shapes from the circle shape part, At the time of swinging, at least one of the branched seal portions is in contact with the sealing surface and sealed, so that a wide angle of 180 ° or more can be swung.

  The invention according to claim 2 is such that a seal packing is attached to a vane that divides a cylinder chamber left and right into which a cover is attached to the top and bottom of the main body tube, and the seal packing is shaped like a circle between the shaft and the cover, The long side sliding portion seal shape of the vane fitted and fixed to the shaft has a U-shape, and has a continuously integral seal surface in a circle shape that is a seal portion between the shaft and the cover, The groove is wider than the cross-sectional width of the seal packing disposed on the vane. Further, a rib having substantially the same dimension as the width of the seal packing mounting groove is formed at a substantially central portion of the linear seal portion in the U-shaped portion on the long side of the seal packing.

  According to a third aspect of the present invention, the main body tube described in the first aspect is divided into two parts, and the respective processing is added to a molded product in which the cover according to the first aspect is integrally formed on one end surface of the main body tube. Thus, a cylinder chamber in which a vane fixed to the shaft swings by being combined in the opposite direction is configured.

  As described above, according to the wide-angle vane type oscillating actuator of the first aspect, the vane having the seal packing attached to the shaft is fitted in the cylinder chamber in which the cover is attached to the upper and lower sides of the main body tube having the inner diameter shape. It is fixed and partitions the cylinder chamber. The shape of the seal packing attached to the vane fixed in the vicinity of the longitudinal center of the shaft is that the seal between the shaft and the upper and lower covers has a circle shape, and the fan side tip swings on the long side of the vane extending in the direction perpendicular to the shaft Since the seal packing of the part and the short side fan fulcrum side sliding part of the vane is a U-shaped and is a mounting seal packing continuously having a circle shape and a sealing surface, a partition part in the cylinder chamber, and Leakage of the working fluid to the outside of the shaft hardly occurs, and the seal packing is deformed in the groove arranged in the vane and is mounted with a cross-sectional shape smaller than the groove width so that it can be finely moved. The deformation of the elastic rubber in the groove and the slight fluctuations against the fluctuation of the load on the seal packing due to the repeated uneven load and peristaltic movement, the fluctuation of fluid pressure, Can adapt the frictional resistance force is small, with excellent durability, when the abrasion occurs in the sliding portion of the seal packing for exchange only seal packing, very inexpensive, it has become possible to reuse. Furthermore, since the U-shaped seal part on the short side of the vane of the seal packing is branched into two from the circle shape, at least one of the seal parts is used as the fan fulcrum side swing part even for a swing of 180 ° or more. It can seal against the sliding part of the tube.

  According to the second aspect of the present invention, the seal packing groove width dimension is substantially the same at the substantially central portion of the linear seal portion of the long side U-shaped portion of the seal packing mounted on the vane fitted and fixed to the shaft. The dimensioned ribs prevent the seal packing from rolling and twisting due to fluid pressure and sliding frictional force in the long side groove of the seal packing, resulting in a more stable seal and durability. Can be up.

  According to the invention described in claim 3, the cylinder chamber in which the vane to which the seal packing is attached is fixed to the shaft and the vane is slid inside by the supply and discharge of the working fluid is integrated with the two parts of the main body tube and the cover. Since the molded parts are assembled in the opposite direction, the number of parts is small, and the molded products are made common, so that the cost can be reduced.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view of the present invention, FIG. 2 is a left side view, FIG. 3 is a cross-sectional view of the main body tube I-I and the main tube other than the main body tube II-II in FIG. FIG. 5 shows an exploded perspective view of an essential part of the main body tube II and the main body tube other than the main body tube. In the present invention, the first cover 2 and the second cover 4 are fixed to the upper and lower ends of the main body tube 3 by bolts (not shown), and the main body tube 3 is sealed at a substantially central portion of the shaft 5. The vane 6 to which the packing 61 is attached is fitted and fixed, and the inner cylinder chamber 33 of the main body tube 3 is inserted so as to be swingable. Further, both ends of the shaft 5 are bearings 22 press-fitted into the inner diameter portions of the holes 21 and 41 provided in the first cover 2 and the second cover 4 as swing axes in the main body tube 3 of the vane 6. 42 is inserted and protrudes from the lower surface of the first cover 2 and the upper surface of the second cover 4 as output shafts 5b and 5a.

  Further, as shown in FIGS. 3, 4, and 5, the vane 6 is provided with grooves 6 a, 6 b, and 6 c in which a seal packing 61 that is integrally formed to partition the cylinder chamber 33 can be mounted. The groove 6c is disposed so that the circle-shaped portion 61c of the seal packing 61 that seals the shaft 5, the first cover 2, and the second cover 4 can be mounted, and the long side of the vane A groove 6b is provided on the side so that the U-shaped portion 61b can be mounted, and a U-shaped portion 61a branched from the circle-shaped portion 61c of the seal packing 61 into two is mounted on the short side of the vane. A groove 6a branched in two from the groove 6c is arranged so as to be able to do so.

  Next, the operation will be described. When pressurized fluid is supplied to the port 31 disposed in the main body tube 3 of the wide-angle vane type oscillating actuator 1 and the pressurized fluid is discharged from the port 32, the pressurized fluid passes through the passage. Pressurized to the right side of the cylinder chamber 33 partitioned by the vane 6 through 31a, and pressurized fluid is discharged from the port 32 through the passage 32a from the left side of the cylinder chamber 33. The vane 6 oscillates in the left direction (counterclockwise direction) in FIG. Conversely, when pressurized fluid is supplied to the port 32 and the pressurized fluid is discharged from the port 31, the pressurized fluid is pressurized to the left side of the cylinder chamber 33 partitioned by the vane 6 through the passage 32a. Since the pressurized fluid is discharged from the port 31 through the passage 31a from the right side of 33, the vane fitted and fixed to the shaft 5 swings in the right direction (clockwise direction) in FIG. In this case, since the U-shaped portion 61a branched into two from the circle-shaped portion 61c of the seal packing 61 is formed on the short side of the vane, a swing angle of 180 ° or more is possible. Furthermore, as a result of branching, as shown in FIGS. 3 and 4, at the start of operation with a high frictional resistance, only one side of the U-shaped part seal 61 a on the short side becomes a resistance at both ends of the scissors movement movement. The power is kept low.

  Further, as shown in FIG. 5, in FIG. 5, the long side U-shaped linear seal portion of the seal packing 61 is provided with a rib 61 d having substantially the same groove width as the substantially central portion of the linear seal portion. Therefore, it is possible to prevent rolling and twisting in the groove 61b near the center of the linear seal portion.

  6 and 7 show the wide-angle vane type peristaltic actuator of the second embodiment. The main body tube of the same wide angle vane type swing actuator as shown in the first embodiment is integrally formed with the cover, and the tube cover A and the tube cover B are processed on the molded product and combined in the opposite direction. In the cylinder chamber, as in the first embodiment, a shaft on which a vane fitted with a seal packing is integrally fixed protrudes from the upper part of the tube cover A and the lower part of the tube cover B, and can be swung with the shaft as a peristaltic shaft.

  As an embodiment of the present invention, the wide angle vane type oscillating actuator has a vane height of 26.5 mm, a long side vane width from the axis of the output shaft of 39 mm, and a short side vane width of 13 mm. Is a wide-angle vane-type peristaltic actuator with a peristaltic angle of 180 ° that branches into two U-shaped parts at 100 ° from the short-side circle-shaped portion with a center diameter of 10.6 mm and a circle-shaped portion of 10.6 mm Prototyped. As a result, one seal functions for each of 40 ° at the swing angle of 180 ° and two seals function for 100 ° at the center of the swing angle, but the operation from both ends is 0.05 MPa or less. Even at the center of 100 °, it operated smoothly without stick-slip, and in the durability test, there was little leakage after 5 million times, and a smooth operation was obtained.

It is sectional drawing of the wide angle vane type rocking | fluctuation actuator which shows 1st embodiment of this invention. It is a left view of embodiment of FIG. It is II-II sectional drawing other than the main body tube II at the time of the rightward swing of FIG. 2, and a main body tube. FIG. 3 is a cross-sectional view taken along the left-hand side of FIG. It is a principal part disassembled perspective view of the wide angle vane type swing actuator of this invention. It is sectional drawing of the wide angle vane type rocking | fluctuation actuator which shows 2nd embodiment of this invention. It is a left view of embodiment of FIG.

1-wide-angle vane type swing actuator 2-first cover 3-body tube 4-second cover 5-shaft 6-vanes 6a, 6b, 6c-groove 7-tube cover A
8-Tube cover B
21, 41, 71, 81-holes 22, 42, 72, 82-bearings 31, 32-ports 33-cylinder chamber 61-seal packing 61a-U-shaped portion 61b of seal packing-length of seal packing Side U-shaped part 61c-Circle shape part 61d of seal packing-Rib

Claims (3)

  Covers are attached to the upper and lower sides of the fan-shaped main body tube, and a vane fixed to the shaft is inserted into the main body tube so as to be freely reciprocally slidable in the main body tube. In a vane-type peristaltic actuator that performs a peristaltic motion with the shaft as an axis by switching between supply and discharge of the working fluid to each cylinder chamber partitioned into a seal packing attached to a groove of the vane that partitions the cylinder chamber The seal portion between the shaft and the upper and lower covers has a circle shape larger than the shaft diameter, and the seal packing of the long side swinging portion of the vane and the short side swinging portion of the vane perpendicular to the shaft The U-shape is formed to have a sealing surface that is continuously integrated with the circle shape, and the seal pad of the short side sliding portion is further formed. A wide-angle vane-type oscillating actuator characterized in that the branch is bifurcated into two from the circle-shaped portion, and at least one of the branched seal portions is in contact with the arc-shaped seal surface of the main body tube for sealing. .   The seal is provided at the substantially central portion of the U-shaped linear seal portion installed in the groove of the long side sliding portion of the seal packing attached to the vane that partitions the cylinder chamber of the wide angle vane type sliding actuator. 2. The wide-angle vane type swing actuator according to claim 1, wherein at least one rib having substantially the same size as the packing mounting groove width is formed.   In the wide-angle vane-type peristaltic actuator according to claim 1 or 2, the main body tube is vertically divided into two, and a cover is integrally formed on the upper surface of the upper tube and the lower surface of the lower tube. Wide angle vane type peristaltic actuator.

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