JP2516158B2 - Torque actuator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque actuator used as a driving means for a butterfly valve,
The present invention relates to a torque actuator adapted to convert reciprocating motion of a piston arm connected from a piston into forward and reverse rotations of an output rotary shaft.

[0002]

2. Description of the Related Art As a torque actuator of this type, a reciprocating motion of a piston arm is controlled by a drive pin on the piston arm side and an output rotary shaft side fan arm engaging with the drive pin. The forward and reverse rotation of the scout choke type torque actuator and the reciprocating motion of the piston arm are converted into forward and reverse rotation of the output rotary shaft by the rack gear on the piston arm side and the pinion gear on the output rotary shaft side. A known rack and pinion type torque actuator is known, and in any type of torque actuator, two output shafts disposed in the middle of both pistons are driven by two pistons that move toward and away from each other in opposite directions. The double piston type and the single piston type in which one output shaft is driven by one piston It is.

However, regardless of the type, in the conventional torque actuator of this type, the body for accommodating the means for converting the reciprocating motion of the piston arm into the forward / reverse rotation of the output rotary shaft and the piston is a double piston type. It is configured either exclusively or for a single piston type. In particular, the main part of the body that incorporates the means for converting the reciprocating motion of the piston arm into the forward and reverse rotation of the output rotary shaft is also used for the double piston type and the single piston type. No torque actuator was considered that could be considered. Therefore, it has been difficult to reduce the cost of this type of torque actuator regardless of the type.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a torque actuator capable of solving the above-mentioned conventional problems, and a single piston type torque actuator of the present invention. Is a reference numeral of an embodiment described later, and is shown in claim 1.
In the invention, the reciprocating motion of the body (B), one output rotary shaft (5), one piston (16), and the piston (16) is reversed to that of the output rotary shaft (5). A means (44, 21) for converting into rotation, and a body (B)
Is a cylindrical main body (1) having both ends open without walls having piston arm guide holes at both ends in the axial direction, and a bottomed cylindrical body (2) for a cylinder tube for closing one open end of the cylindrical main body (1). ) And a cover plate (43) that closes the open other end of the tubular body (1).
An inner peripheral surface (1a) continuous on both sides in the diametrical direction parallel to the axial direction over the entire axial direction, a first port (34) communicating with the internal space of the tubular main body (1), and an axial through flow passage ( 37) and a second port (35) communicating with the axial through-flow passage (37) are formed, and the bottomed cylindrical body (2) for a cylinder tube has an axial through-hole of the tubular body (1). A flow path (38) is formed which connects one end of the flow path (37) and the inner space end of the bottomed cylindrical body (2), and the cover plate (43) is an axial direction of the cylindrical main body (1). The other end of the through channel (37) is closed, and the output rotation shaft (5) is located at the axial center of the tubular body (1) and at the center of the internal space of the tubular body (1). The piston (16) is supported in a direction traversing the main body (1), and the piston (16) is in the bottomed cylindrical body (2) for a cylinder tube. It intended to fit into axially movably, the piston arm (1 extending in the tubular body (1) in
8), the piston arm (18) is disposed on one side of the output rotary shaft (5), and the inner peripheral surface (1a) of the tubular main body (1) and the rotary periphery on the output rotary shaft (5) side. surface is supported sandwiched slidably between the still and the above thin
Regardless of whether it is a guru piston type or a double piston type,
The reciprocating motion of the rotary shaft (16, 17)
The means for converting into rotation is the piston arm (18, 19)
Side drive pin (21, 22) and this drive pin (21, 2
2) The fan arm (1) on the output rotary shaft (5) side that engages with (2)
3,44) and a scout choke type torque actuator
Inside the tubular body (1) of the body (B)
The tip of the fan arm (13, 44) floats in the space
The concave groove portion (15) to be formed in the entire axial direction of the cylindrical main body (1).
It is configured to be continuous at the same depth throughout.

In the double piston type torque actuator constructed according to the invention as claimed in claim 2, the cylinder tube bottomed cylinder body (3) having the same structure as the cylinder tube bottomed cylinder body (2) has the cover plate (3). 43)
In place of the above, the approaching / separating motion of the pistons (16, 17) attached to the cylindrical main body (1) and fitted in the bottomed cylindrical bodies (2, 3) for both cylinder tubes is controlled by the output rotary shaft (5). A scout choke type torque actuator having means (13, 22, 49-51) for converting into forward and reverse rotations,
The piston arms (18, 19) extending from the pistons (16, 17) in the bottomed cylindrical bodies (2, 3) for both cylinder tubes into the tubular main body (1) respectively have the output rotary shaft (5). are arranged to sandwich claims, it is supported sandwiched slidably between the inner peripheral surface of the respective tubular body (1) (1a) and an output rotary shaft (5) side rotational peripheral surface of the It has the configuration described in item 1 .

When the bottomed cylindrical body (2, 3) for the cylinder tube in the body (B) has a larger inner diameter than the tubular body (1) and the output torque is increased, the tubular body (1) is used. And the ring-shaped spacer plate (45,
46), and the spacer plate (45, 46)
Is a relay channel (47, 39) that connects the end of the axial through channel (37) of the tubular body (1) and the channel (38, 39) on the bottomed cylindrical body (2, 3) side. 48) can be formed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a preferred embodiment of a double-piston type scout choke type torque actuator constructed according to the present invention will be described with reference to the accompanying drawings. In FIGS. And 2 and 3 are bottomed cylindrical bodies for cylinder tubes. The tubular body 1 and the two bottomed cylindrical bodies 2 and 3 are both made of die-cast casting, and the bottomed cylindrical bodies 2 and 3 are provided at both ends of the tubular body 1.
The body B of the actuator is formed by airtightly coupling and integrating the open ends of the above through a seal member 4 such as an O-ring.

Reference numeral 5 denotes an output rotary shaft, which is located at a central position in the axial direction of the cylindrical main body 1 and has a cylindrical inner peripheral surface (1) of the cylindrical main body 1.
At the center position of a), the small-diameter shaft portion 5a is supported in a direction transverse to the cylindrical main body 1 and, as shown in detail in FIG. 2, a small-diameter shaft portion 5a is formed. Bearing member 6 having a small diameter portion 6a that abuts a step portion 5c between
Is fitted from the small-diameter shaft portion 5a side, and the stop ring 7 abutting on the outside of the small-diameter portion 6a is fitted and locked to the small-diameter shaft portion 5a, so that the bearing member 6 is located near one end of the output rotary shaft 5. It is attached so that only relative rotation is possible.

On the other hand, on both sides of the axially central position of the tubular body 1, a bearing portion 8a into which the bearing member 6 is fitted and a bearing for rotatably supporting the free end portion of the shaft body 5a of the output rotary shaft 5 are supported. The shaft main body 5 of the output rotary shaft 5 is integrally formed with the portion 8b.
a The free end portion is inserted into the bearing portion 8b, and the bearing member 6 is fitted into the bearing portion 8a and fixed with the bolt 9 so that the output rotary shaft 5 is rotatably supported by the tubular main body 1. There is. Reference numerals 10 and 11 are sealing materials for maintaining airtightness such as O-rings, and 12 is a sealing material that protects the stop ring 7 from the outside. According to the support structure of the output rotary shaft 5, it is not necessary to provide a retaining means at each end of the output rotary shaft 5, and the structure is simple, and the assembly to the tubular body 1 is easy. You can do it.

In FIG. 1, reference numeral 13 denotes a fan arm, which has a boss 13a on which a key 14 is attached to the output rotary shaft 5.
And fork portions 13b and 13c that are fixed to the boss portion 13a and extend to both sides in the diametrical direction from the boss portion 13a. As shown in FIG. 2, the pair of fork portions 13b and 13c are arranged in parallel in the axial direction of the output rotary shaft 5, and the distance from the axial center of the output rotary shaft 5 to the tip of each of the fork portions 13b and 13c is equal to the distance between them. As shown in FIG. 1, the inner peripheral surface radii of the bottomed cylindrical bodies 2 and 3 are larger than each other. Therefore, in the inner space of the cylindrical main body 1, as shown in FIGS. The recessed groove portion 15 in which the tips of the fork portions 13b and 13c are loosely fitted and moved when the fork portions 13b and 13c rotate together with the output rotation shaft 5 is continuous at the same depth over the entire axial direction of the cylindrical main body (1). Is formed.

As shown in FIG. 1, both bottomed cylindrical bodies 2,
Pistons 16 and 17 are respectively fitted in the shaft 3 so as to be slidable in the axial direction. From one piston 16, rotation between the pair of juxtaposed fork portions 13b of the fan arm 13 on the output rotary shaft 5 side is performed. A piston arm 18, which is sandwiched between the peripheral surface, that is, the boss portion 13a of the agitating arm 13 and the inner peripheral surface 1a of the cylindrical main body 1 opposed to the peripheral surface, is slidably supported in the axial direction. From the piston 17 of the
It is sandwiched between the pair of juxtaposed fork portions 13c of three, the rotary peripheral surface on the output rotary shaft 5 side, that is, the boss portion 13a of the fan arm 13 and the inner peripheral surface 1a of the cylindrical main body 1 facing the boss portion 13a. A piston arm 19 is supported so as to be slidable in the axial direction. Further, drive pins 21, 22 whose both ends are loosely fitted in the radial cutout grooves 20 of the fork portions 13b, 13c are penetratingly attached to the piston arms 18, 19, respectively. In FIG. 1, 23 is each piston 16,
An airtight seal member such as an O-ring attached to 17 is shown, and in FIG. 2, 24 is a retaining ring attached to both ends of each drive pin 21, 22.

As shown in FIGS. 1 and 4, the agitating arm 13 has an abutted portion on one fork portion 13b on one axial side of the output rotary shaft 5 and on both sides in the swinging direction. 25 and 26 are integrally projectingly provided, and when both pistons 16 and 17 move to the separation limit position as shown in FIG. In a state in which the stopper bolt 28 with which the other contacted portion 26 abuts when 16 and 17 move to the approach limit position is aligned in the axial direction of the tubular main body 1 in a direction orthogonal to the axial direction, As shown in FIG. 3, the stopper bolt support portions 29 and 30 integrally formed with the cylindrical main body 1 are screwed and penetrated. In addition,
These stopper bolts 27, 28 are provided on the contacted portion 25,
It is fixed with lock nuts 31 and 32 shown in FIG. 2 and FIG. 3 in a state where the position of the inner end for receiving 26 is adjusted for each withdrawal. 33 is an airtight sealing material.

As shown in FIGS. 2 and 3, the tubular body 1 is provided with two pressure fluid supply / discharge ports 34, 35 arranged side by side in the port forming protrusion 1b. The first port 34 communicates directly with the inside of the tubular body 1 via a flow path 36, and the second port 35 is formed in the thick wall portion 1c of the tubular body 1 as shown in FIG. Axial through channel 37
And the flow paths 38, 3 formed in the thick wall portions 2a, 3a of the bottomed cylindrical bodies 2, 3 so as to be connected to both ends of the flow path 37.
9, and communicates with the innermost ends of the bottomed cylindrical bodies 2 and 3. Reference numeral 40 is an airtight sealing material such as an O-ring which is interposed in the connecting portion of the flow paths 37, 38 and 37, 39.

Reference numeral 41 in FIG. 3 denotes a bolt for connecting the bottomed cylindrical bodies 2 and 3 to both ends of the cylindrical main body 1, and a nut portion integrally formed on each bottomed cylindrical body 2 and 3 side. It is screwed to 42.

In the scuff choke type double piston type torque actuator constructed as described above, as shown in FIG. 1, both pistons 16 and 17 are in the separated limit position, and the abutted portion 25 of the agitating arm 13 is abutted. Is in contact with the stopper bolt 27, the pressure fluid is supplied from the second port 35 to the innermost ends of the bottomed cylindrical bodies 2 and 3 through the flow paths 37 to 39, and the pistons 16 and 17 are Are moved toward each other, the piston arms 18, 1
The drive pins 21 and 22 of 9 move the fan arm 13 via the fork portions 13b and 13c of the fan arm 13 until the contacted portion 26 contacts the stopper bolt 28, and only about 90 degrees counterclockwise in the drawing. Rotate.

When the pistons 16 and 17 are at the approaching limit position and the contacted portion 26 of the agitating arm 13 is in contact with the stopper bolt 28, the passage 3 from the first port 34.
When the pressure fluid is supplied into the cylindrical main body 1 via 6 and both pistons 16 and 17 are moved in a direction in which they are separated from each other, the drive pins 21 and 22 of the piston arms 18 and 19 cause the fork portions of the agitating arm 13 to move. The abutted portion 25 of the agitating arm 13 is connected to the stopper bolt 27 via the 13b and 13c.
Until it comes into contact with, it is rotated clockwise by approximately 90 degrees in the figure.

As described above, the agitating arm 13 is moved to approximately 90 degrees.
Can be reciprocally rocked within a range of degrees, and the rotation of the fan arm 13 is transmitted to the output rotary shaft 5 via the key 14. Therefore, a valve or the like connected to the output rotary shaft 5 can be opened / closed normally. can do. Of course, the reciprocating swing range of the agitating arm 13 (the forward / reverse rotation angle of the output rotary shaft 5) and the position of its stroke limit can be finely adjusted by adjusting the forward / backward movement of both stopper bolts 27, 28. Further, the piston arms 18 and 19 are arranged between the pair of fork portions 13b and 13c of the fan arm 13 arranged side by side, and the fan arm boss portion 13a, which is the peripheral surface of rotation on the output rotary shaft 5 side, and the inner peripheral surface of the tubular body 1. 1a
Since the pistons 16 and 17 are sandwiched and guided so as to be slidable in the axial direction, the pistons 16 and 17 can slide smoothly without being twisted even if their axial lengths are short.

FIG. 5 shows a single piston type torque actuator according to a preferred embodiment of the present invention. This torque actuator comprises a cylindrical main body 1 with an output rotary shaft 5 of the above embodiment and the above embodiment. A cylinder body (1) which is configured by using a bottomed cylindrical body 2 for a cylinder tube in which a piston 16 is fitted and a cover plate 43.
The piston arm 18 extending inward is disposed on one side of the output rotary shaft 5 and is slidably sandwiched between the inner peripheral surface 1a of the tubular body 1 and the rotary peripheral surface on the output rotary shaft 5 side. Supported. The cover plate 43 closes the other end of the cylindrical main body 1 that is not closed by the bottomed cylindrical body 2 for a cylinder tube, and closes one end of the axial through-flow passage 37 formed in the cylindrical main body 1. . When this actuator is of the scaffold type, a fork portion 44a that engages only with the drive pin 21 of the piston arm 18 as shown in the drawing.
The agitating arm 44 including the above may be attached to the output rotary shaft 5 instead of the agitating arm 13. In this case, as illustrated, the piston arm 18 can be slidably sandwiched and supported between the boss portion peripheral surface of the fan arm 44 and the inner peripheral surface 1a of the cylindrical body 1.

Further, as shown in FIG. 6, the cylindrical main body 1
It is also possible to increase the output torque by incorporating the large-diameter pistons 16 and 17 by using the bottomed cylindrical bodies 2 and 3 for cylinder tubes having an inner diameter sufficiently larger than the inner diameter of the above. In this case, when there is a difference in diameter such that the bottomed cylindrical bodies 2 and 3 cannot be directly connected to both ends of the cylindrical body 1, ring-shaped spacer plates 45 and 46 can be interposed therebetween. . In this case, the spacer plate 4
5, 46, the flow path 37 in the cylindrical main body 1 and the bottomed cylindrical body 2,
Relay flow paths 47, 48 for connecting to the flow paths 38, 39 in
Can be provided.

Further, in the present invention, as shown in FIG. 7 , the fork portion 13 of the fan arm 13 or 43 is provided.
b, 13c or 43a as one, piston arm 1
8 and 19 may be formed in a bifurcated shape that sandwiches the fork portion 13b, 13c or 43a from both left and right sides. Further, as in the previous embodiment, the fan arm 13 or 4
When the two fork portions 13b, 13c or 43a of 3 are arranged in parallel, the two concave groove portions 15 on the side of the cylindrical body 1 in which the tips of these fork portions are loosely fitted and moved are also provided in parallel. As shown in FIG. 8 , by utilizing the intermediate portion of the bi-concave groove portion 15, the axial through-flow passage 37 provided in the tubular body 1 is moved to the inner side as much as possible, thereby reducing the size of the tubular body 1. Can be achieved.

The present invention can also be implemented as a so-called spring return type actuator in which one of the reciprocating motions of the piston is performed by the biasing force of the spring.

[0022]

As is apparent from the above embodiments, according to the present invention, a means for converting the reciprocating movement of the output rotary shaft (5) and the piston into the forward and reverse rotation of the output rotary shaft (5) is provided. In the built-in tubular body (1), the output rotary shaft (5) is located at the axial center position of the tubular body (1) and at the center position of the internal space of the tubular body (1). The cylindrical body (1) is supported in a direction transverse to (1), and the tubular body (1) is not provided with walls having piston arm guide holes at both axial ends, and axially extends over the entire axial direction on both sides in the diametrical direction. An inner peripheral surface (1a) continuous in parallel with the first port (34) communicating with the internal space of the tubular main body (1),
The axial through-flow passage (37) and the axial through-flow passage (3
Since the second port (35) communicating with 7) is provided, a single piston type torque actuator or a double piston type torque actuator can be constructed as follows.

That is, in the case of implementing it as a single piston type torque actuator, the piston (16) is fitted inside and the axial through flow passage (3) of the cylindrical main body (1) is provided.
Flow path (38) for communicating the end of 7) with the bottom of the internal space
The open end of the cylindrical main body (1) is closed by one cylinder-bottomed cylinder body (2) for a cylinder tube, and a cylinder is formed from the piston (16) in the cylinder-tube bottomed cylinder body (2). A piston arm (18) extending into the main body (1) is arranged on one side of the output rotary shaft (5),
It can be slidably supported between the inner peripheral surface (1a) of the tubular main body (1) and the rotary peripheral surface on the output rotary shaft (5) side.
When implemented as a double-piston type torque actuator, the pistons (16, 17) are fitted inside and the ends of the axial through flow passages (37) of the tubular body (1) communicate with the bottom of the internal space. Two bottomed cylinders (2, 3) for cylinder tubes in which flow paths (38, 39) are formed
The open ends of the cylindrical body (1) are closed by the pistons (1) in the bottomed cylinders (2, 3) for the cylinder tubes.
The two piston arms (18, 19) extending from the cylindrical body (1) to the inside of the cylindrical body (1) are respectively arranged on both sides of the output rotary shaft (5), and the two piston arms (18, 19) are arranged respectively on the both sides of the output rotating shaft (5). It can be slidably supported between the inner peripheral surface (1a) and the rotary peripheral surface on the output rotary shaft (5) side.

In other words, the cylindrical main body (1) having a means for converting the reciprocal movement of the output rotary shaft (5) and the piston into the forward and reverse rotation of the output rotary shaft (5) is constructed as described above. As a result, the tubular main body (1), which is the main part of this type of actuator, moves the body of the single-piston torque actuator and the pair of pistons (16, 17) in the opposite directions by pressure fluid as described above. Thus, it can be used also as a body of a double piston type torque actuator capable of outputting a large torque. And when implementing as any type of actuator, it suffices to connect the pressure fluid pipes to the two ports provided in the tubular body (1), and the bottomed cylindrical body for the cylinder tube into which the piston is fitted. It is not necessary to provide a pressure fluid port in (2, 3) or the cover plate (43) for piping, and the tubular body (1) itself also has a wall or a dedicated part for slidably supporting the piston arm. Is not required, but a cylindrical inner peripheral surface (1
Since the structure having a) can be made extremely simple, the entire actuator can be implemented in a lightweight and inexpensive manner.

Moreover, the piston arm is arranged at one side or both sides of the output rotary shaft (5) supported by the tubular body (1) at the above-mentioned position, and the tubular body (1) is provided.
Since it is slidably supported by being sandwiched between the inner peripheral surface (1a) and the rotary peripheral surface on the output rotary shaft (5) side, the piston arm can be used in any type of actuator. It is possible to make the cross-sectional shape and the size of the fundamentally constant. Also in this respect, the entire actuator can be constructed at low cost.

Further, according to the present invention, a concave groove portion (15) in which the tip of the fan arm (13, 44) engaging with the drive pin of the piston arm floats is provided in the internal space of the cylindrical main body (1). By forming the cylindrical body (1) so as to be continuous at the same depth over the entire axial direction, the length of the agitating arm is not limited to the diameter of the piston (that is, the inner diameter of the cylinder with a bottom for a cylinder tube). Not only is it possible to increase the output torque by increasing the length, but it is also possible to increase the output torque, as well as to provide a cylindrical shape as compared with the case where the concave groove portion is formed in an arc shape along the tip swing locus of the fan arm (13, 44). The body (1) is easy to manufacture and can be implemented inexpensively.

Further, according to the third aspect of the invention , even when an actuator having a large output torque is to be manufactured by using a piston having a diameter larger than the inner diameter of the cylindrical main body (1), it is particularly preferable to use a cylinder. The actuator can be manufactured easily and at low cost without changing the configuration or size of the main body (1).

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a central longitudinal side view of the same main portion.

FIG. 3 is a bottom view of the same.

FIG. 4 is a vertical cross-sectional rear view of the main part, showing a state in which the fan arm is rocked to a standing position.

FIG. 5 is a schematic vertical sectional front view showing a second embodiment.

FIG. 6 is a schematic vertical sectional front view showing a third embodiment.

FIG. 7 is a vertical cross-sectional view of a main part showing a modified example of the embodiment shown in FIG .
It is a side view.

FIG. 8 is a diagram showing another modification of the embodiment shown in FIG .
It is a vertical side view of a part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical main body 2 Cylinder tube bottomed cylindrical body 3 Cylinder tube bottomed cylindrical body 5 Output rotation shaft 6 Bearing member 13 Fan arm 13a Fan arm boss part (rotation peripheral surface on the output rotary shaft side) 13b Fan arm fork part 13c Agitating arm fork part 15 Axial groove 16 Piston 17 Piston 18 Piston arm 19 Piston arm 21 Drive pin 22 Drive pin 25 Abutted part 26 Abutted part 27 Stopper bolt 28 Stopper bolt 34 Pressure fluid supply / discharge port 35 Pressure Fluid supply / discharge port 36 Flow path 37 Axial through flow path 38 Flow path 39 Flow path 43 Cover plate 44 Fan arm 43a Fan arm fork 45 Ring spacer plate 46 Ring spacer plate B Body

Claims (3)

(57) [Claims] 1. A body (B), one output rotary shaft (5), one piston (16), and reciprocating motion of the piston (16) is converted into forward and reverse rotation of the output rotary shaft (5). A body (B) having a means (44, 21) for converting, and the body (B) is a tubular main body (1) having both ends open without a wall having piston arm guiding holes at both ends in the axial direction.
And a bottomed cylindrical body (2) for a cylinder tube that closes the open end of the tubular body (1), and a cover plate (43) that closes the open other end of the tubular body (1). In (1), the inner peripheral surface (1a) continuous on both sides in the diametrical direction parallel to the axial direction over the entire axial direction, and the first port (34) communicating with the internal space of the tubular main body (1).
An axial through passage (37) and a second port (35) communicating with the axial through passage (37),
The bottomed cylindrical body (2) for a cylinder tube is a channel that connects one end of the axially through channel (37) of the tubular body (1) and the end of the internal space of the bottomed cylindrical body (2). (38) is formed, and the cover plate (43) has a tubular body (1).
The other end of the axial through-flow passage (37) is closed, and the output rotation shaft (5) is at the axial center position of the tubular body (1) and at the internal space center position of the tubular body (1). The piston (16) is axially movably fitted in the bottomed cylindrical body (2) for a cylinder tube, and is supported in a direction traversing the cylindrical body (1). A piston arm (18) extending inward is provided, and the piston arm (18) is arranged on one side of the output rotation shaft (5) and rotates with the inner peripheral surface (1a) of the tubular body (1) and the output rotation. shaft is supported sandwiched slidably between the rotating peripheral surface (5) side, the output rotary shaft reciprocating movement of the piston (16, 17) (5)
The means for converting into normal and reverse rotation of the piston arm (18,
19) side drive pin (21, 22) and this drive pin (2
1, 22) engaging fan arm on the output rotary shaft (5) side
(13,44) and scout choke type torque actuator
In the inner space of the tubular main body (1) of the body (B) which is a chute,
A groove (1) in which the tip of the agitating arm (13, 44) floats.
5) is formed, and the concave groove portion (15) has a cylindrical main body.
(1) A torque actuator that is continuous at the same depth over the entire axial direction . 2. A cylinder (2) having a bottom for the cylinder tube.
A bottomed cylindrical body (3) for a cylinder tube having the same structure as that of the cylindrical main body (1) instead of the cover plate (43).
Attached to the bottomed cylinder for both cylinder tubes (2,
A means (1) for converting the approaching / separating movement of the pistons (16, 17) fitted in the inside of (3) into forward / reverse rotation of the output rotating shaft (5).
3,22,49-51), and a scoop choke type torque actuator, wherein each of the cylinders (2,3) has a cylindrical body from a piston (16,17) in the bottomed cylinder (2,3). The piston arms (18, 19) extending in (1) are arranged so as to sandwich the output rotation shaft (5) therebetween, and output rotation is performed with respect to the inner peripheral surface (1a) of the cylindrical main body (1). The torque actuator according to claim 1, wherein the torque actuator is slidably sandwiched between and supported by the rotating peripheral surface on the shaft (5) side. 3. A bottomed cylindrical body (2, 3) for a cylinder tube, wherein the body (B) has a larger inner diameter than the cylindrical main body (1).
And a ring-shaped spacer plate (45, 46) interposed between the cylindrical main body (1) and the bottomed cylindrical body (2, 3) for a cylinder tube.
5, 46), the axial through flow path (3
7) end and the flow path (38, 3) on the bottomed cylindrical body (2, 3) side
The torque actuator according to claim 1 or 2 , wherein a relay flow path (47, 48) communicating with 9) is formed.