Flow rate adjustment device and actuator system for aircraft

Abstract

To make a flow rate of fluid passing through an orifice appropriate.SOLUTION: The flow control device 10 includes the housing 20 having the main passage 25 and the port hole 35 branched from the main passage 25 and extending to the outside, the throttle wall 40 located on the X1 side in the first direction with respect to the first opening 35A of the port hole 35 and defining the orifice 45 having a smaller passage cross-sectional area than the other portion in the housing 20, the rod 50 inserted into the housing 20 from the opening of the housing 20 on the side opposite to the throttle wall 40 across the first opening 35A of the port hole 35 and screwed to the inner peripheral surface of the housing 20, and the pin 58 protruding from the tip of the rod 50 toward the orifice 45 and insertable into the orifice 45 by the rod 50 moving relative to the housing 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a flow control device and an actuator system for an aircraft. [Background technology]

[0002] The flow control device disclosed in Patent Document 1 includes a body with a flow path defined therein. A fluid flows through the flow path within the body. An orifice having a smaller cross-sectional area than the rest of the flow path is provided midway through the flow path. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-105427 Summary of the Invention [Problem to be solved by the invention]

[0004] In a technology such as that disclosed in Patent Document 1, which has an orifice in the middle of a flow path, the cross-sectional area of ​​the orifice varies from product to product, and therefore, depending on the product, the flow rate of the fluid passing through the orifice may not always be appropriate. [Means for solving the problem]

[0005] A flow control device for solving the above problems includes a cylindrical housing extending along a central axis, the housing having a flow path along the central axis and a porthole branching from the flow path to the outside; a throttle wall located on one side of a branch point of the porthole to the flow path in a direction along the central axis, the throttle wall protruding from the inner surface of the housing and defining an orifice with its protruding end having a flow path cross-sectional area smaller than other parts of the housing; a rod inserted into the housing from an opening in the housing on the opposite side of the branch point from the throttle wall and screwed into the inner surface of the housing; and a pin protruding from the tip of the rod toward the orifice, the pin being insertable into the orifice when the rod moves relative to the housing along the central axis.

[0006] In the above configuration, since the rod is threadedly engaged with the housing, the relative position of the rod to the housing, and therefore the relative position of the pin to the orifice, can be adjusted by rotating the rod relative to the housing, thereby adjusting the flow rate of the fluid passing through the orifice.

[0007] In the flow control device, the pin may be columnar and extend in a direction along the central axis, and the area of ​​the cross section perpendicular to the central axis may become smaller the further away from the rod in the direction along the central axis.

[0008] In the flow control device, the throttling wall may be cylindrical with its center on an axis along the central axis, and the flow path cross-sectional area of ​​the orifice defined by the inner surface of the throttling wall may increase as it moves away from the rod in the direction along the central axis.

[0009] In the flow rate control device, a portion of the rod opposite to the side inserted into the housing is exposed to the outside of the housing, and the device includes a nut that is screwed onto the portion of the rod that is exposed from the housing, and a pair of lock washers that are positioned between the housing and the nut and are aligned in a direction along the central axis, and each of the pair of lock washers is annular and has a washer central axis that is along the central axis, and surfaces of the pair of lock washers that face each other are radially aligned with the washer central axis as the center. The lock washer may be divided into a plurality of first cam surfaces and a plurality of second cam surfaces extending therefrom, the first cam surfaces being inclined with respect to an imaginary plane perpendicular to the washer central axis so that the thickness of the lock washer in the direction along the washer central axis increases as it moves toward one side in the circumferential direction centered on the washer central axis, and the second cam surfaces being inclined with respect to the imaginary plane so that the thickness of the lock washer in the direction along the washer central axis decreases as it moves toward the one side in the circumferential direction, and the first cam surfaces and the second cam surfaces may be arranged alternately in the circumferential direction.

[0010] In the flow control device, the housing may have a regulating surface facing the one side in the direction along the central axis on the opposite side of the branching point from the throttling wall, and may be provided with a stopper that is formed integrally with the rod and contacts the regulating surface from the one side when the end of the pin opposite the rod is positioned closer to the rod than the center of the orifice in the direction along the central axis.

[0011] An actuator system for an aircraft that solves the above-mentioned problems is applied to an aircraft having a plurality of moving surfaces, and comprises: an actuator provided for each moving surface and operating in response to fluid pressure to drive the moving surface; a supply / discharge flow path provided for each actuator for supplying / discharging a fluid to / from the actuator; and a flow control device provided in a portion of the supply / discharge flow path, wherein the flow control device is a cylindrical housing extending along a central axis and having a flow path along the central axis and a porthole branching from the flow path to the outside; and a flow control device located on one side of a branch point of the porthole to the flow path in a direction along the central axis, protruding from an inner peripheral surface of the housing and having a protruding end that controls the flow control device. The flow control device has a throttling wall that defines an orifice with a smaller flow path cross-sectional area than other parts of the housing, a rod that is inserted into the housing from an opening in the housing on the opposite side of the branching point from the throttling wall and is threaded onto the inner surface of the housing, and a pin that protrudes from the tip of the rod toward the orifice and can be inserted into the orifice by the rod moving relative to the housing along the central axis, and the flow path of the flow control device is connected to the part of the supply and discharge flow path outside the housing through an opening on the outer surface of the housing at the porthole and an opening in the housing on the opposite side to the side where the rod is inserted.

[0012] With the above configuration, in the fluid supply / discharge flow path for the actuator for each rotor blade in an aircraft, the flow rate of the fluid passing through the orifice located midway along the supply / discharge flow path can be adjusted. [Effects of the Invention]

[0013] The above technical concept allows for an appropriate flow rate of fluid passing through the orifice. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing the main wings and flaps of an aircraft. [Figure 2]FIG. 2 is a schematic diagram of the actuator system. [Figure 3] FIG. 3 is a cross-sectional view of the flow rate control device. [Figure 4] 4 is a cross-sectional view taken along the arrow 4-4 in FIG. [Figure 5] FIG. 5 is a perspective view of the first lock washer. [Figure 6] FIG. 6 is a perspective view of the second lock washer. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of an actuator system for an aircraft will be described below with reference to the drawings. Note that the drawings are schematic representations for the purpose of easily understanding the configuration of the actuator system, and the dimensional relationships and detailed shapes of the components do not necessarily correspond to the actual ones.

[0016] <Overall structure> As shown in FIG. 1, the aircraft 500 has two main wings 510 and multiple flaps 520 for each main wing 510. Note that FIG. 1 shows only one of the two main wings 510. The multiple flaps 520 are located on the rear portion of the main wing 510. The flap 520 is a movable surface. The flap 520 is a type of high-lift device for increasing the lift of the aircraft 500. The multiple flaps 520 are lined up on the left and right.

[0017] The aircraft 500 is equipped with a plurality of actuator systems 200. An actuator system 200 is provided for each flap 520. As shown in FIG. 2, the actuator system 200 includes an actuator 210 and a supply / discharge flow path 250. The actuator 210 includes a cylinder 220 and a piston rod 230. The cylinder 220 is cylindrical. Both ends of the cylinder 220 along the central axis are closed. The piston rod 230 includes a piston 234 and a rod main body 232. The piston 234 is located inside the cylinder 220. The piston 234 divides the interior of the cylinder 220 into two parts along the central axis of the cylinder 220. Specifically, the piston 234 divides the interior of the cylinder 220 into a first fluid chamber 220A and a second fluid chamber 220B. The rod main body 232 protrudes from the inside of the cylinder 220 to the outside. The tip of the portion of the rod main body 232 located inside the cylinder 220 is connected to the piston 234. The tip of the rod body 232, which is located outside the cylinder 220, is an annular rod end. The rod end is connected to the flap 520.

[0018] The supply / discharge flow path 250 has two systems: a first supply / discharge flow path 251 and a second supply / discharge flow path 252. The first supply / discharge flow path 251 connects a first fluid chamber 220A of the actuator 210 to a hydraulic mechanism 290 installed in the aircraft 500. The first supply / discharge flow path 251 supplies / discharges hydraulic oil to / from the first fluid chamber 220A depending on the operating state of the hydraulic mechanism 290. The second supply / discharge flow path 252 connects a second fluid chamber 220B of the actuator 210 to the hydraulic mechanism 290. The second supply / discharge flow path 252 supplies / discharges hydraulic oil to / from the second fluid chamber 220B depending on the operating state of the hydraulic mechanism 290. In response to this supply / discharge of hydraulic oil, a hydraulic pressure difference occurs between the first fluid chamber 220A and the second fluid chamber 220B. The piston 234, and therefore the entire piston rod 230, moves in response to this hydraulic pressure difference. Specifically, piston rod 230 reciprocates in a direction along the central axis of cylinder 220. The movement of piston rod 230 drives flap 520. In this manner, actuator 210 drives flap 520 by operating in accordance with the pressure of the hydraulic oil.

[0019] More specifically, the second supply / discharge flow path 252 is made up of a base flow path 252A, a flow rate control device 10, and an extension flow path 252B. The base flow path 252A connects the hydraulic mechanism 290 and the flow rate control device 10. The extension flow path 252B connects the flow rate control device 10 and the second fluid chamber 220B of the actuator 210. The base flow path 252A, the flow rate control device 10, and the extension flow path 252B are connected by a flow path forming member 260.

[0020] Specifically, as shown in FIG. 3 , the flow path forming member 260 defines a portion of the base flow path 252A and a portion of the extension flow path 252B. Both the base flow path 252A and the extension flow path 252B extend linearly within the flow path forming member 260. The central axis of the base flow path 252A and the central axis of the extension flow path 252B are substantially perpendicular to each other. The flow path forming member 260 has, for example, a rectangular parallelepiped shape. A mounting recess 262 is recessed in a first side surface 261, which is one of the multiple side surfaces of the flow path forming member 260. The outer shape of the mounting recess 262 is cylindrical. The extension flow path 252B opens at the circular bottom surface of the mounting recess 262. The base flow path 252A opens at the side surface of the mounting recess 262. The flow control device 10 is disposed in the mounting recess 262. In a state where the flow control device 10 is disposed in the mounting recess 262, the flow control device 10 communicates with the base flow path 252A and the extension flow path 252B. The manner in which the flow control device 10 is disposed in the mounting recess 262 will be described in detail later.

[0021] <Flow rate adjustment device> As shown in FIG. 3 , the flow control device 10 includes a housing 20. The housing 20 includes a peripheral wall 30. The peripheral wall 30 is cylindrical and extends along a specific axis. Hereinafter, when there is no need to distinguish between two directions along the central axis C of the peripheral wall 30, these directions will be collectively referred to as a reference axial direction X. Furthermore, one of the reference axial directions X will be referred to as a first direction X1, and the opposite direction will be referred to as a second direction X2. Furthermore, a radial direction centered on the central axis C of the peripheral wall 30 will be simply referred to as a radial direction. Furthermore, a circumferential direction centered on the central axis C of the peripheral wall 30 will be simply referred to as a circumferential direction.

[0022] The peripheral wall 30 includes a large diameter portion 32 and a small diameter portion 34. The large diameter portion 32 is a portion of the peripheral wall 30 that is closer to the second direction X2 than a midpoint in the reference axial direction X. The small diameter portion 34 is the remaining portion of the peripheral wall 30. The large diameter portion 32 and the small diameter portion 34 are coaxial and differ from each other only in their inner diameters. The inner diameter of the large diameter portion 32 is larger than the inner diameter of the small diameter portion 34. At the boundary between the large diameter portion 32 and the small diameter portion 34, the inner circumferential surfaces of the large diameter portion 32 and the small diameter portion 34 are connected by a step surface 36 that extends radially. In this embodiment, the boundary between the large diameter portion 32 and the small diameter portion 34 is located closer to the first direction X1 than the center of the peripheral wall 30 in the reference axial direction X.

[0023] The inner circumferential surface of the peripheral wall 30, i.e., the inner circumferential surface of the large diameter portion 32 and the inner circumferential surface of the small diameter portion 34, define a main flow path 25 for hydraulic oil. As the inner circumferential surface of the peripheral wall 30 extends along the central axis C of the peripheral wall 30, the main flow path 25 extends along the central axis C of the peripheral wall 30. However, in consideration of the arrangement of the rod 50 described below, the main flow path 25 is provided only in a portion of the peripheral wall 30 closer to the first direction X1. This point will be described later.

[0024] A certain range of the peripheral wall 30 extending from the end on the second direction X2 side toward the first direction X1 with respect to the reference axial direction X is a threaded portion 30P. An internal thread is formed on the inner peripheral surface of the threaded portion 30P. A seal member S1 is disposed on the outer peripheral surface of the peripheral wall 30 near the center of the peripheral wall 30 with respect to the reference axial direction X, sealing the gap between the outer peripheral surface and the flow path forming member 260. The seal member S1 extends around the entire outer peripheral surface of the peripheral wall 30. Similarly, a seal member S2 is disposed on the outer peripheral surface of the peripheral wall 30 near the end on the first direction X1 side of the peripheral wall 30, sealing the gap between the outer peripheral surface and the flow path forming member 260. The seal member S2 extends around the entire outer peripheral surface of the peripheral wall 30.

[0025] The housing 20 has a porthole 35. The porthole 35 is located in the large-diameter portion 32 of the peripheral wall 30, closer to the first direction X1 than the center in the reference axial direction X. Specifically, the porthole 35 is located in the large-diameter portion 32 near the boundary between the large-diameter portion 32 and the small-diameter portion 34. The porthole 35 penetrates the peripheral wall 30 in the radial direction. That is, the porthole 35 is open on both the inner and outer circumferential surfaces of the peripheral wall 30. The opening of the porthole 35 on the inner circumferential surface of the peripheral wall 30 is a branch point of the porthole 35 with respect to the main flow passage 25. The opening of the porthole 35 on the outer circumferential surface of the peripheral wall 30 is a communication port of the porthole 35 to the outside. In this way, the porthole 35 branches from the main flow passage 25 and reaches the outside of the peripheral wall 30 and ultimately the housing 20. The porthole 35 defines a branch flow passage branched from the main flow passage 25. Hereinafter, the opening of the porthole 35 on the inner circumferential surface of the circumferential wall 30 may be referred to as a first opening 35A.

[0026] The housing 20 has two key grooves 37. The key grooves 37 are recessed in the end face of the peripheral wall 30 facing the second direction X2. The outer shape of the key grooves 37 is, for example, a rectangular parallelepiped. The two key grooves 37 are located 180 degrees apart in the circumferential direction. Note that the outer shape of the key grooves 37 is exaggerated in FIG. 3 .

[0027] The housing 20 includes a flange 21. The flange 21 is located on the second direction X2 side of the center in the reference axial direction X in the large diameter portion 32 of the peripheral wall 30. The flange 21 protrudes from the outer peripheral surface of the peripheral wall 30. The flange 21 extends around the entire circumference of the peripheral wall 30.

[0028] <Aperture wall> As shown in FIG. 3 , the flow control device 10 includes a throttle wall 40. The throttle wall 40 is located inside the peripheral wall 30. The throttle wall 40 is located on the first direction X1 side with respect to the first opening 35A of the porthole 35. Specifically, the throttle wall 40 is located at the end of the small-diameter portion 34 of the peripheral wall 30 on the second direction X2 side. The throttle wall 40 protrudes from the inner peripheral surface of the peripheral wall 30. The throttle wall 40 is cylindrical. The central axis C of the throttle wall 40 approximately coincides with the central axis C of the peripheral wall 30. In this embodiment, the axis approximately coincides with the central axis C of the peripheral wall 30 is uniformly designated by the symbol C. In this embodiment, the throttle wall 40 is integrally molded with the peripheral wall 30. Therefore, there is no substantial boundary between the throttle wall 40 and the peripheral wall 30. The inner peripheral surface of the throttle wall 40 is the end of the throttle wall 40 that protrudes from the peripheral wall 30.

[0029] The position of the throttle wall 40 in the reference axial direction X will be described in detail. As a premise, the dimension of the throttle wall 40 in the reference axial direction X is smaller than the dimension of the small diameter portion 34 of the peripheral wall 30 in the reference axial direction X. Based on this dimensional relationship, the end of the throttle wall 40 on the second direction X2 side is located at the same position as the boundary between the large diameter portion 32 and the small diameter portion 34 in the reference axial direction X. The end face of the throttle wall 40 on the second direction X2 side is flush with the step surface 36 connecting the large diameter portion 32 and the small diameter portion 34.

[0030] The inner circumferential surface of the throttle wall 40 defines an orifice 45, which is part of the main flow path 25. The flow path cross-sectional area of ​​the orifice 45 is smaller than the flow path cross-sectional area of ​​other parts of the main flow path 25. The flow path cross-sectional area is the area of ​​a cross section of the main flow path 25 that is perpendicular to the central axis C of the peripheral wall 30. In consideration of the arrangement of the throttle wall 40 in the reference axial direction X, the orifice 45 separates a part of the main flow path 25 that is formed by the inner circumferential surface of the large diameter portion 32 from a part that is formed by the inner circumferential surface of the small diameter portion 34.

[0031] In the reference axial direction X, the range from the end of the throttle wall 40 on the second direction X2 side to a predetermined position is referred to as a first range 41. The predetermined position is approximately the center of the throttle wall 40 in the reference axial direction X. The inner diameter of the throttle wall 40 in the first range 41 is approximately constant at each position in the reference axial direction X. In the reference axial direction X, the range from the predetermined position on the throttle wall 40 to the end on the first direction X1 side is referred to as a second range 42. The inner diameter of the throttle wall 40 in the second range 42 gradually increases toward the first direction X1 side. As a result, the flow path cross-sectional area of ​​the orifice 45 in the second range 42 gradually increases toward the first direction X1 side. Note that in relation to the rod 50 described later, it can also be said that the flow path cross-sectional area of ​​the orifice 45 in the second range 42 increases with increasing distance from the rod 50 in the reference axial direction X.

[0032] <Rod> As shown in FIG. 3 , the flow control device 10 includes a rod 50. The rod 50 is inserted into the peripheral wall 30 from an opening in the peripheral wall 30 on the second direction X2 side. The opening in the peripheral wall 30 on the second direction X2 side is an opening in the peripheral wall 30 on the opposite side from the throttle wall 40 across the first opening 35A of the porthole 35. The rod 50 is cylindrical. The central axis C of the rod 50 substantially coincides with the central axis C of the peripheral wall 30. The diameter of the rod 50 substantially coincides with the inner diameter of the peripheral wall 30. A portion of the rod 50 protrudes in the second direction X2 from the opening in the peripheral wall 30 on the second direction X2 side. In other words, a portion of the rod 50 on the opposite side to the side inserted into the peripheral wall 30 is exposed to the outside of the peripheral wall 30.

[0033] The end face 50A of the rod 50 facing the first direction X1 is located on the second direction X2 side with respect to the first opening 35A of the porthole 35. In other words, the outer peripheral surface of the rod 50 does not block the first opening 35A of the porthole 35. As will be described later, the rod 50 is movable relative to the peripheral wall 30 in the reference axial direction X. However, regardless of the position of the rod 50 within its movable range, the end face 50A is located on the second direction X2 side with respect to the first opening 35A. The end face 50A blocks the main flow passage 25 within the peripheral wall 30 from the second direction X2 side. In other words, as a result of the rod 50 being inserted into the peripheral wall 30 from the second direction X2 side, the main flow passage 25 is defined by a portion of the peripheral wall 30 on the first direction X1 side with respect to the end face 50A of the rod 50 on the first direction X1 side. A seal member S3 is disposed on the outer peripheral surface of the rod 50 near an end face 50A of the rod 50 on the first direction X1 side, to seal the gap between the outer peripheral surface of the rod 50 and the inner peripheral surface of the peripheral wall 30. The seal member S3 extends around the entire circumference of the rod 50.

[0034] An end face 50B of the rod 50 facing the second direction X2 is located outside the peripheral wall 30. As will be described later, the rod 50 is movable relative to the peripheral wall 30 in the reference axial direction X, but the end face 50B is located outside the peripheral wall 30 regardless of the position of the rod 50 within the movable range. A tool groove 53 is recessed in this end face 50B. The tool groove 53 is a groove into which a tool such as a screwdriver is fitted. In this embodiment, the tool groove 53 extends linearly in the radial direction.

[0035] A certain range of the rod 50 extending from its end on the second direction X2 side toward the first direction X1 is a threaded portion 50P. A male thread is cut on the outer peripheral surface of the threaded portion 50P. The threaded portion 50P extends to a portion of the rod 50 located inside the peripheral wall 30. The end of the threaded portion 30P on the first direction X1 side is located inside the peripheral wall 30 when the rod 50 is located in a first position described below. The outer peripheral surface of the threaded portion 50P is threadedly engaged with the inner peripheral surface of the threaded portion 30P of the peripheral wall 30. Therefore, when the rod 50 is rotated relative to the peripheral wall 30, the rod 50 moves relative to the peripheral wall 30 in the reference axial direction X. This changes the relative position of the rod 50 and the peripheral wall 30 in the reference axial direction X.

[0036] The rod 50 has a washer groove 52. The washer groove 52 is provided in a circumferential portion of the threaded portion 50P. As shown in FIG. 4, the washer groove 52 is recessed from the outer peripheral surface of the rod 50. The washer groove 52 has a rectangular outer shape in cross section. As shown in FIG. 3, the washer groove 52 opens at the end face 50A of the rod 50 on the second direction X2 side. Note that in FIGS. 3 and 4, the outer shape of the washer groove 52 is exaggerated. Also, in FIG. 4, the male thread of the rod 50 is not shown.

[0037] <Pin> 3, the flow control device 10 includes a pin 58. The pin 58 protrudes in the first direction X1 from an end face 50A of the rod 50 facing the first direction X1. The end face 50A of the rod 50 facing the first direction X1 is the tip face of the rod 50 on the side that is inserted into the peripheral wall 30. In this embodiment, the pin 58 is integrally molded with the rod 50.

[0038] The pin 58 is cylindrical overall. The central axis C of the pin 58 substantially coincides with the central axis C of the rod 50 and therefore the throttle wall 40. In other words, the pin 58 is provided coaxially with the orifice 45 defined by the inner circumferential surface of the throttle wall 40. Due to the positional relationship between the rod 50 and the throttle wall 40 in the reference axial direction X, the pin 58 protrudes from an end face 50A of the rod 50 on the first direction X1 side toward the orifice 45.

[0039] The diameter of the pin 58 gradually decreases toward the first direction X1. In other words, the area of ​​a cross section of the pin 58 perpendicular to its central axis C decreases as it moves away from the rod 50 in the first direction X1. The maximum value of the diameter of the pin 58 is smaller than the diameter of the rod 50. The maximum value of the diameter of the pin 58 is also slightly smaller than the inner diameter of the first region 41 of the throttle wall 40. In other words, the maximum value of the diameter of the pin 58 is smaller than the minimum value of the inner diameter of the throttle wall 40.

[0040] The pin 58, together with the rod 50, can move relative to the peripheral wall 30 in the reference axial direction X. Due to the size relationship between the inner diameter of the throttle wall 40 and the diameter of the pin 58, the pin 58 moves relative to the peripheral wall 30 together with the rod 50, and the pin 58 can be inserted into the orifice 45.

[0041] <Stopper> As shown in FIG. 3, the flow control device 10 includes a stopper 55. The stopper 55 protrudes from the outer peripheral surface of the rod 50. In this embodiment, the stopper 55 is integrally molded with the rod 50. The stopper 55 extends around the entire circumference of the rod 50. In other words, the stopper 55 is annular. In the reference axial direction X, the stopper 55 is located near the center of the rod 50.

[0042] As a structure corresponding to the stopper 55, the housing 20 is provided with a restriction groove 38. The restriction groove 38 is recessed from the inner circumferential surface of the large diameter portion 32 in the peripheral wall 30. In other words, the restriction groove 38 is located on the opposite side of the throttle wall 40 across the first opening 35A of the porthole 35. In this embodiment, the restriction groove 38 is located closer to the second direction X2 than the center of the large diameter portion 32 in the reference axial direction X.

[0043] The restriction groove 38 is provided around the entire circumference of the peripheral wall 30. In other words, the restriction groove 38 is annular. Specifically, the restriction groove 38 has a bottom surface 38A, a first restriction surface 38B, and a second restriction surface 38C. The bottom surface 38A is the radially outer end surface of the restriction groove 38. At each position in the circumferential direction, the bottom surface 38A has a constant width in the reference axial direction X. The width of the bottom surface 38A in the reference axial direction X is greater than the width of the stopper 55 in the reference axial direction X.

[0044] The first restriction surface 38B is a side surface of the restriction groove 38 on the second direction X2 side in the reference axial direction X. That is, the first restriction surface 38B rises radially inward from the end of the bottom surface 38A on the second direction X2 side. The radially inner end of the first restriction surface 38B is connected to the inner circumferential surface of the large diameter portion 32. The first restriction surface 38B faces the first direction X1 side. The radial dimension of the first restriction surface 38B is slightly larger than the radial dimension of the stopper 55.

[0045] The second restriction surface 38C is a side surface of the restriction groove 38 on the first direction X1 side in the reference axial direction X. That is, the second restriction surface 38C rises radially inward from the end of the bottom surface 38A on the first direction X1 side. The radially inner end of the second restriction surface 38C is connected to the inner circumferential surface of the large diameter portion 32. The second restriction surface 38C faces the second direction X2 side. The radial dimension of the second restriction surface 38C is approximately the same as the radial dimension of the first restriction surface 38B.

[0046] The restriction groove 38 accommodates a stopper 55. Due to the dimensional relationship between the restriction groove 38 and the stopper 55 in the reference axial direction X, the stopper 55 can move within the restriction groove 38 in the reference axial direction X as the rod 50 moves relative to the peripheral wall 30. The stopper 55 and the rod 50 as a unit can move between a first position where the stopper 55 contacts the first restriction surface 38B from the first direction X1 side and a second position where the stopper 55 contacts the second restriction surface 38C from the second direction X2 side. FIG. 3 shows the first position of the rod 50. As shown in FIG. 3, in the first position, the tip of the pin 58 on the first direction X1 side, i.e., the end of the pin 58 opposite the rod 50, is located at an initial position within the orifice 45. The initial position is a position of the first region 41 of the throttle wall 40 between the center of the first region 41 in the reference axial direction X and the end of the throttle wall 40 on the second direction X2 side. In other words, the initial position is a position within the orifice 45 that is closer to the rod 50 than the center of the orifice 45 in the reference axial direction X. Although not shown, at the second position, the tip of the pin 58 on the first direction X1 side is located at an end position within the orifice 45. The end position is a position within the second region 42 of the throttle wall 40 between the center of the second region 42 in the reference axial direction X and the end of the throttle wall 40 on the first direction X1 side.

[0047] <Lock washer> As shown in FIG. 3, the flow control device 10 includes a nut N and a pair of lock washers 70, 80. The nut N is located on a portion of the rod 50 that is exposed from the peripheral wall 30. The nut N is cylindrical. The central axis C of the nut N approximately coincides with the central axis C of the rod 50. The outer diameter of the nut N approximately coincides with the outer diameter of the peripheral wall 30. The inner diameter of the nut N approximately coincides with the diameter of the rod 50. An internal thread is formed on the inner peripheral surface of the nut N. The rod 50 passes through the nut N. The nut N is screwed onto the outer peripheral surface of a threaded portion 50P of the rod 50.

[0048] The pair of lock washers 70, 80 are located in the reference axial direction X between the nut N and an end face of the peripheral wall 30 facing the second direction X2. The pair of lock washers 70, 80 are sandwiched between the nut N and the end face of the peripheral wall 30 facing the second direction X2. The pair of lock washers 70, 80 are aligned in the reference axial direction X.

[0049] As shown in FIG. 5, the first lock washer 70, which is one of the pair of lock washers 70, 80, includes a washer body 71 and two fitting keys 75. The washer body 71 is annular. As shown in FIG. 3, the washer central axis C of the washer body 71 substantially coincides with the central axis C of the rod 50 and therefore the peripheral wall 30. The outer diameter of the washer body 71 substantially coincides with the outer diameter of the peripheral wall 30. The inner diameter of the washer body 71 substantially coincides with the diameter of the rod 50. The surface of the washer body 71 facing the first direction X1 forms a contact end surface 72 that comes into contact with the end surface of the peripheral wall 30 facing the second direction X2. The contact end surface 72 is a flat surface perpendicular to the washer central axis C.

[0050] The two mating keys 75 protrude from the contact end surface 72. The outer shape and dimensions of the mating keys 75 approximately match the outer shape and dimensions of the key grooves 37 in the peripheral wall 30. That is, the mating keys 75 are rectangular parallelepiped-shaped. The two mating keys 75 are located 180 degrees apart in the circumferential direction.

[0051] The surface of the washer body 71 facing the second direction X2 is an opposing surface 73 that faces the second lock washer 80. As shown in FIG. 5 , the opposing surface 73 is divided into a plurality of first cam surfaces 171 and a plurality of second cam surfaces 172. The plurality of first cam surfaces 171 and the plurality of second cam surfaces 172 extend radially from the washer central axis C. The first cam surfaces 171 and the second cam surfaces 172 are adjacent to each other in the circumferential direction. Here, an imaginary plane perpendicular to the washer central axis C is referred to as a washer imaginary plane. Furthermore, a direction toward a specific side of the circumferential direction centered on the washer central axis C is referred to as a specific direction. The first cam surface 171 is inclined with respect to the washer imaginary plane so that the thickness of the washer body 71 in the direction along the washer central axis C increases as it approaches the specific direction. The second cam surfaces 172 are inclined with respect to the washer imaginary plane so that the thickness of the washer body 71 in the direction along the washer central axis C decreases toward a specific direction. When comparing one first cam surface 171 with one second cam surface 172, the angular range of the first cam surface 171 and the angular range of the second cam surface 172 in the circumferential direction centered on the washer central axis C are approximately the same. Furthermore, when comparing one first cam surface 171 with one second cam surface 172, the acute inclination angle of the first cam surface 171 with the acute inclination angle of the second cam surface 172 relative to the washer imaginary plane are approximately the same. On the opposing surface 73, the first cam surfaces 171 and the second cam surfaces 172 are alternately arranged in the circumferential direction. Hereinafter, a pair of a first cam surface 171 and a second cam surface 172 may be referred to as a cam pair. For example, 50 cam angles are provided on the opposing surface 73.

[0052] 6, the second lock washer 80 includes a washer body 81 and a protrusion 85. The washer body 81 is annular. The washer central axis C of the washer body 81 substantially coincides with the central axis C of the first lock washer 70. The outer diameter and inner diameter of the washer body 81 substantially coincide with the outer diameter and inner diameter of the washer body 71 of the first lock washer 70.

[0053] As shown in Fig. 3, the surface of the washer body 81 facing the first direction X1 is an opposing surface 83 that faces the first lock washer 70. As shown in Fig. 6, the configuration of the opposing surface 83 is the same as the configuration of the opposing surface 73 of the first lock washer 70. That is, the opposing surface 83 is divided into a plurality of first cam surfaces 171 and a plurality of second cam surfaces 172. The number of cam sets on the opposing surface 83 matches the number of cam sets on the opposing surface 73 of the first lock washer 70.

[0054] 3, the surface of the washer body 81 facing the second direction X2 forms a contact end surface 82 that comes into contact with the end surface of the nut N facing the first direction X1. The contact end surface 82 is a flat surface that is perpendicular to the washer central axis C.

[0055] The protrusion 85 protrudes from the inner peripheral surface of the washer body 81. The protrusion 85 has, for example, a rectangular parallelepiped shape. The dimensions of the protrusion 85 in the circumferential and radial directions are approximately the same as the dimensions of the washer groove 52 of the rod 50.

[0056] The pair of lock washers 70, 80 are in the following fitted state when sandwiched between the nut N and the end face of the peripheral wall 30 on the second direction X2 side. The two fitting keys 75 of the first lock washer 70 are fitted into the key grooves 37 of the housing 20. The two fitting keys 75 restrict relative rotation of the first lock washer 70 with respect to the peripheral wall 30. The protrusion 85 of the second lock washer 80 is fitted into the washer groove 52 of the rod 50. The protrusion 85 restricts relative rotation of the second lock washer 80 with respect to the rod 50. The opposing surface 73 of the first lock washer 70 and the opposing surface 83 of the second lock washer 80 are pressed against each other. At the same time, the recesses and projections formed by the first cam surface 171 and the second cam surface 172 of the two opposing surfaces 73, 83 fit together. The engagement of the two opposing surfaces 73, 83 restricts relative rotation between the first lock washer 70 and the second lock washer 80. As a result of restricting relative rotation between the respective members in this manner, relative rotation of the rod 50 with respect to the peripheral wall 30 is restricted.

[0057] <Installation of flow rate regulator> 3, the flow control device 10 is disposed in a mounting recess 262 in the flow path forming member 260. The details of this arrangement will be described below. The flow control device 10 is inserted into the mounting recess 262 so that the end face of the peripheral wall 30 facing the first direction X1 faces the bottom of the mounting recess 262. When the flow control device 10 is disposed in the mounting recess 262, the flange 21 of the flow control device 10 contacts the first side surface 261 of the flow path forming member 260 from the second direction X2 side. The flange 21 of the flow control device 10 is fixed to the first side surface 261 of the flow path forming member 260 with, for example, a bolt.

[0058] When the flow control device 10 is disposed in the mounting recess 262, the opening of the peripheral wall 30 on the side facing the first direction X1 is connected to the extension flow path 252B. Furthermore, when the flow control device 10 is disposed in the mounting recess 262, the opening of the porthole 35 on the outer circumferential surface of the peripheral wall 30 is connected to the base flow path 252A. In this way, the main flow path 25 in the peripheral wall 30 is connected to the portion of the second supply / discharge flow path 252 outside the housing 20 through the opening of the peripheral wall 30 on the side opposite to the side where the rod 50 is inserted and the opening of the porthole 35 on the outer circumferential surface of the peripheral wall 30.

[0059] Based on this connection relationship of the flow paths, when hydraulic oil is supplied to the second fluid chamber 220B, as shown by arrow A in FIG. 2, the hydraulic oil supplied from the hydraulic mechanism 290 reaches the second fluid chamber 220B via the base flow path 252A, the flow control device 10, and the extension flow path 252B. As shown by arrow A1 in FIG. 3, the hydraulic oil then flows from the base flow path 252A to the main flow path 25 via the porthole 35 of the flow control device 10. Then, as shown by arrow A2 in FIG. 3, the hydraulic oil reaches the extension flow path 252B from the main flow path 25. On the other hand, when hydraulic oil is discharged from the second fluid chamber 220B, as shown by arrow B in FIG. 2, the hydraulic oil from the second fluid chamber 220B reaches the hydraulic mechanism 290 via the extension flow path 252B, the flow control device 10, and the base flow path 252A. As shown by arrow B1 in Fig. 3, the hydraulic oil flows from the extension flow path 252B through the main flow path 25 of the flow control device 10 to the porthole 35. Then, as shown by arrow B2 in Fig. 3, the hydraulic oil flows from the porthole 35 to the base flow path 252A. When the hydraulic oil flows in this manner, the hydraulic oil passes through the orifice 45 midway through the main flow path 25 within the flow control device 10. As the hydraulic oil passes through the orifice 45, the flow velocity of the hydraulic oil decreases.

[0060] <Operation of the embodiment> The flow control device 10 has an adjustment function for adjusting the position of the pin 58 relative to the throttle wall 40 and therefore the orifice 45. This adjustment function is used, for example, when an operator adjusts the flow rate to the actuator 210 in an aircraft 500 assembly factory.

[0061] A series of steps for adjusting the position of the pin 58 will be described below. It is assumed that the housing 20 is fixed to the flow path forming member 260. In this state, the worker first loosens the nut N. Next, the worker slides the second lock washer 80, of the first lock washer 70 and the second lock washer 80 that are fitted together, in the second direction X2 relative to the rod 50 and the peripheral wall 30. This separates the second lock washer 80 from the first lock washer 70, releasing the engagement between the opposing surface 73 of the first lock washer 70 and the opposing surface 83 of the second lock washer 80. In this state, the worker sets a tool in the tool groove 53 of the rod 50. Then, the worker rotates the rod 50 using the tool. When the rod 50 is rotated, the second lock washer 80 rotates together with the rod 50 due to the fitting relationship between the washer groove 52 of the rod 50 and the protrusion 85 of the second lock washer 80. In the flow control device 10 of this embodiment, the rod 50 is threadedly engaged with the peripheral wall 30. Therefore, when the rod 50 is rotated relative to the peripheral wall 30, the relative position of the rod 50 with respect to the peripheral wall 30 in the reference axial direction X changes. At the same time, the relative position of the pin 58 with respect to the throttle wall 40 and therefore the orifice 45 in the reference axial direction X changes. When the relative position of the pin 58 with respect to the orifice 45 changes, the flow rate of the hydraulic oil flowing through the annular space between the outer circumferential surface of the pin 58 and the protruding end of the throttle wall 40 changes. By changing the rotation direction of the rod 50, the operator can move the pin 58 in either the first direction X1 or the second direction X2. When the operator moves the rod 50 to a position where an appropriate flow rate can be obtained, he or she slides the second lock washer 80 in the first direction X1. Then, when the opposing surface 73 of the second lock washer 80 engages with the opposing surface 83 of the first lock washer 70, the operator tightens the nut N. This locks the position of the rod 50. Through this series of operations, the position adjustment of the rod 50 is completed.

[0062] With respect to the male thread formed on the rod 50, the distance between adjacent threads in the reference axial direction X is referred to as one pitch. Even if the operator adjusts the position of the rod 50 with a resolution finer than one pitch, the operator can lock the position of the rod 50 at the adjusted position. That is, in this embodiment, the opposing surfaces 73 of the first lock washer 70 and the opposing surfaces 83 of the second lock washer 80 are divided into multiple cam sets. The operator can engage the opposing surfaces 73 of the first lock washer 70 and the opposing surfaces 83 of the second lock washer 80 for each angle range of the cam sets. In other words, the operator can lock the position of the rod 50 for each angle range of the cam sets. For example, suppose the operator releases the engagement between the opposing surfaces 73 of the first lock washer 70 and the opposing surfaces 83 of the second lock washer 80 and then rotates the rod 50 by a first angle. The first angle corresponds to ten cam angles arranged in the circumferential direction. Suppose that the worker then slides the second lock washer 80 in the first direction X1 to fit the opposing surface 83 of the second lock washer 80 into the opposing surface 73 of the first lock washer 70. This allows the worker to lock the position of the rod 50 at a position where the rod 50 has been rotated by the first angle. Note that an angle corresponding to ten cam sets is described here as an example of the first angle. However, the first angle is not limited to this example, and an angle corresponding to the number of cam sets required to move the rod 50 may be set.

[0063] The flow control device 10 of this embodiment has a key groove 37 in the housing 20. By using this key groove 37, the lock position of the rod 50 in the reference axial direction X can also be changed. The workflow in this case will be outlined below. It is assumed that the housing 20 is fixed to the flow path forming member 260. In this state, the worker first loosens the nut N. Next, while maintaining the first lock washer 70 and the second lock washer 80 engaged with each other, the worker slides both the first lock washer 70 and the second lock washer 80 toward the second direction X2 relative to the rod 50 and the peripheral wall 30. This releases the engagement between the engagement key 75 of the first lock washer 70 and the key groove 37 of the housing 20. Then, the worker rotates the first lock washer 70, the second lock washer 80, and the rod 50 together circumferentially by 180 degrees. After this, the worker slides the first lock washer 70 and the second lock washer 80 toward the first direction X1. Then, when the fitting key 75 of the first lock washer 70 fits into the key groove 37 of the housing 20, the worker tightens the nut N. This allows the worker to lock the relative rotation between the rod 50 and the peripheral wall 30 at a position where the rod 50 is rotated 180 degrees. By rotating the rod 50 180 degrees, the rod 50 moves a half-pitch in the reference axial direction X relative to the peripheral wall 30. Note that, although the example here shows a case where the rod 50 is rotated 180 degrees, the lock position of the rod 50 can be changed using the key groove 37 as long as the rotation amount is a multiple of 180 degrees.

[0064] <Effects of the embodiment> (1) In the flow control device 10 of this embodiment, the rod 50 is threadedly engaged with the peripheral wall 30. Therefore, by rotating the rod 50 relative to the peripheral wall 30, the relative position of the rod 50 with respect to the peripheral wall 30, and therefore the relative position of the pin 58 with respect to the orifice 45, can be adjusted. This makes it possible to adjust the amount of hydraulic oil passing through the orifice 45. Therefore, the amount of hydraulic oil passing through the orifice 45 can be made appropriate.

[0065] (2) In the flow control device 10 of this embodiment, the pin 58 is tapered. By employing such a pin 58, the size of the gap between the pin 58 and the protruding end of the throttle wall 40 can be gradually changed depending on the position of the pin 58 in the reference axial direction X. Therefore, the amount of hydraulic oil passing through the gap can be finely adjusted.

[0066] (3) In the flow control device 10 of this embodiment, the throttle wall 40 has a constant inner diameter in the first region 41 thereof. On the other hand, in the second region 42 of the throttle wall 40, the inner diameter gradually increases toward the first direction X1 side. When this configuration is adopted, the throttle wall 40 has a greater thickness at the end of the first region 41 on the second direction X2 side than at the end of the second region 42 on the first direction X1 side. Therefore, the throttle wall 40 is strong against the pressure of hydraulic oil acting on the throttle wall 40 from the second direction X2 side. On the other hand, in the second region 42, the inner diameter of the throttle wall 40 gradually increases toward the first direction X1 side. In this second region 42, hydraulic oil flowing into the orifice 45 from the first direction X1 side can be smoothly guided.

[0067] (4) As described in the operation of the above embodiment, in the flow control device 10 of this embodiment, the opposing surface 73 of the first lock washer 70 is divided into multiple cam sets. The same is true for the opposing surface 83 of the second lock washer 80. By providing these multiple cam sets, the flow control device 10 can lock the position of the rod 50 in response to position changes of the rod 50 with a resolution finer than one pitch. In other words, the flow control device 10 of this embodiment allows position adjustment with high resolution when changing the position of the rod 50, and therefore the pin 58.

[0068] (5) The flow control device 10 of this embodiment includes a stopper 55 that defines the movement range of the rod 50. Specifically, when the rod 50 reaches the first position, the stopper 55 comes into contact with the first restriction surface 38B from the first direction X1 side. When the stopper 55 comes into contact with the first restriction surface 38B, the rod 50 is prevented from moving in the second direction X2 side. Furthermore, when the rod 50 reaches the second position, the stopper 55 comes into contact with the second restriction surface 38C. When the stopper 55 comes into contact with the second restriction surface 38C, the rod 50 is prevented from moving in the first direction X1 side. The provision of such a stopper function can prevent the operator from moving the pin 58 to a position outside the orifice 45.

[0069] (6) In the aircraft 500 of this embodiment, an actuator system 200 is provided corresponding to each of the multiple flaps 520. An operator can adjust the position of the pin 58 of the flow control device 10 for each actuator system 200. Through this adjustment, the operator can make the flow rates of hydraulic oil in all of the actuator systems 200 approximately the same. As a result, when each of the flaps 520 in the aircraft 500 is operated, the operation amounts and operation speeds of all of the flaps 520 are approximately the same. This stabilizes the high-lift function of the aircraft 500.

[0070] <Example of change> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0071] The number and positions of the key grooves 37 provided in the housing 20 are not limited to those in the above embodiment. The position at which the rod 50 can be locked changes depending on the number and positions of the key grooves 37. If the number and positions of the key grooves 37 are changed from those in the above embodiment, the number and positions of the fitting keys 75 in the first lock washer 70 may be changed accordingly.

[0072] The configuration of the first lock washer 70 and the second lock washer 80 is not limited to the example of the above embodiment. It is sufficient that the relative rotation of the first lock washer 70 and the second lock washer 80 is restricted by the unevenness provided on the opposing surfaces of each other. As long as such a configuration can be realized, the first lock washer 70 and the second lock washer 80 can be appropriately modified from the example of the above embodiment. For example, the angular range of the first cam surface 171 and the angular range of the second cam surface 172 in the circumferential direction about the washer central axis C may be different. Furthermore, the acute inclination angle of the first cam surface 171 and the acute inclination angle of the second cam surface 172 with respect to the washer virtual plane may be different. The number of cam sets may be changed from the example of the above embodiment.

[0073] The fitting key 75 may be eliminated from the first lock washer 70. At the same time, the key groove 37 may be eliminated from the housing 20. For example, as in the above-described modified example, when the fitting key 75 is eliminated from the first lock washer 70, the contact end surface 72 of the first lock washer 70 may be provided with irregularities. Then, the relative rotation between the first lock washer 70 and the peripheral wall 30 may be restricted by utilizing the frictional force acting between the irregularities and the end surface of the peripheral wall 30 facing the second direction X2.

[0074] The protrusion 85 may be eliminated from the second lock washer 80. At the same time, the washer groove 52 may be eliminated from the rod 50. For example, as in the above modified example, when the protrusion 85 is eliminated from the second lock washer 80, the contact end surface 82 of the second lock washer 80 may be provided with irregularities. Then, the relative rotation between the second lock washer 80 and the nut N may be restricted by utilizing the frictional force acting between the irregularities and the end surface of the nut N facing the first direction X1.

[0075] The mechanism for locking the position of the rod 50 relative to the peripheral wall 30 is not limited to the example of the above embodiment. For example, instead of the pair of lock washers 70, 80, a bent washer formed by bending a flat washer into an arched or wavy shape may be used. The position of the rod 50 may also be locked by driving a wedge. The configuration of the lock mechanism is not critical as long as it can lock the position of the rod 50 relative to the peripheral wall 30.

[0076] A mechanism for locking the position of the rod 50 relative to the peripheral wall 30 is not essential. Even if a locking mechanism is not provided, the position of the rod 50 can be maintained to some extent by the friction between the male thread of the rod 50 and the female thread of the peripheral wall 30.

[0077] The definition of the first position related to the movement range of the stopper 55 and the rod 50 is not limited to the example in the above embodiment. For example, at the first position, the tip of the pin 58 on the first direction X1 side may be positioned away from the orifice 45. An appropriate position may be defined as the first position from the perspective of restricting the movement range of the pin 58. The position of the first restriction surface 38B on the housing 20 may then be set appropriately in accordance with the definition of the first position. The same applies to the definition of the second position and the position of the second restriction surface 38C.

[0078] The stopper 55 does not have to be annular in shape, but may be formed by protruding from at least a portion of the outer circumferential surface of the rod 50 in the circumferential direction. The position of the stopper 55 on the rod 50 with respect to the reference axial direction X is not limited to the example in the above embodiment. The stopper 55 may be provided at a position appropriate for restricting the movement of the pin 58.

[0079] The stopper 55 may be eliminated. At the same time, the restricting groove 38 may be eliminated from the housing 20. The configuration of the throttle wall 40 is not limited to the example of the above embodiment. It is sufficient that the throttle wall 40 protrudes from the inner circumferential surface of the peripheral wall 30 and defines a flow path whose cross-sectional area is smaller than that of other portions within the housing 20. As long as such a configuration can be realized, the throttle wall 40 can be modified as appropriate from the example of the above embodiment. For example, the throttle wall 40 may have a constant inner diameter throughout the entire area of ​​the throttle wall 40 in the reference axial direction X. The shape of the protruding end of the throttle wall 40 when viewed in the reference axial direction X may be elliptical or polygonal. In other words, the throttle wall 40 need only be cylindrical as a whole, and is not limited to a cylindrical shape. Furthermore, the throttle wall 40 is not limited to a cylindrical shape. In other words, the throttle wall 40 may be provided on only a portion of the peripheral wall 30 in the circumferential direction.

[0080] The location of the throttle wall 40 is not limited to the example in the above embodiment. The throttle wall 40 may be located on the first direction X1 side of the first opening 35A of the porthole 35. For example, the throttle wall 40 may be located near the center of the small diameter portion 34 of the peripheral wall 30 in the reference axial direction X.

[0081] The configuration of the pin 58 is not limited to the example of the above embodiment. The pin 58 only needs to protrude from the end of the rod 50 on the first direction X1 side toward the orifice 45 and be insertable into the orifice 45 as the rod 50 moves. As long as such a configuration can be realized, the pin 58 can be modified as appropriate from the example of the above embodiment. For example, the relationship between the diameter of the pin 58 and the inner diameter of the throttle wall 40 may be different from that of the example of the above embodiment. The pin 58 is not limited to a tapered shape, and the diameter may be constant over the entire area of ​​the pin 58 in the reference axial direction X. The pin 58 may be a columnar shape other than a cylindrical shape, such as a rectangular columnar shape, or may not be columnar.

[0082] The arrangement of the pin 58 is not limited to the example of the above embodiment. As described above, it is sufficient that the pin 58 can be inserted into the orifice 45 by the relative movement of the rod 50 with respect to the peripheral wall 30. As described above, depending on how the first position is determined, the tip of the pin 58 on the first direction X1 side may be located on the second direction X2 side with respect to the end of the throttle wall 40 on the second direction X2 side.

[0083] The configuration of the rod 50 is not limited to the example of the above embodiment. The rod 50 is required only to be inserted into the peripheral wall 30 from an opening in the peripheral wall 30 on the second direction X2 side and to be threadedly engaged with the inner peripheral surface of the peripheral wall 30. As long as such a configuration can be realized, the rod 50 can be appropriately modified from the example of the above embodiment. For example, the rod 50 may have a stepped cylindrical shape. The shape of the rod 50 other than the portion that threads into the peripheral wall 30 may be other than cylindrical.

[0084] It is not essential that a portion of the rod 50 is exposed in the second direction X2 from the peripheral wall 30. Even if the rod 50 is not exposed from the peripheral wall 30, the rod 50 can be rotated relative to the peripheral wall 30, for example, by using a tool.

[0085] The configuration of the tool groove 53 is not limited to the example of the above embodiment. The tool groove 53 may have any shape that is suitable for the tool used to rotate the rod 50. The tool groove 53 may be, for example, cross-shaped or prismatic.

[0086] The tool groove 53 may be eliminated. If the tool groove 53 is not provided, for example, the operator may rotate the rod 50 himself. The configuration of the housing 20 is not limited to the example of the above embodiment. The housing 20 is required to be cylindrical and extend along the central axis C, and to have a main flow path 25 along the central axis C and portholes 35 branching from this flow path and leading to the outside of the housing 20. As long as such a configuration can be realized, the housing 20 can be modified as appropriate from the example of the above embodiment. For example, the outer shape of the peripheral wall 30 may be other than cylindrical. The inner diameter of the peripheral wall 30 may be constant throughout the entire peripheral wall 30 in the reference axial direction X. The shape of the internal space of the peripheral wall 30 may be other than cylindrical, except for the portion of the peripheral wall 30 that is threadedly engaged with the rod 50. In other words, the peripheral wall 30 is not limited to a cylindrical shape as long as it is cylindrical overall. Even if the peripheral wall 30 is not cylindrical, the inner wall surface of the peripheral wall 30 may be treated as the inner circumferential surface and the outer wall surface of the peripheral wall 30 may be treated as the outer circumferential surface.

[0087] The configuration of the flange 21 is not limited to the example of the above embodiment. For example, the flange 21 may protrude from only a portion of the peripheral wall 30 in the circumferential direction. Depending on the configuration of the object to which the flow control device 10 is attached, the flange 21 may be eliminated.

[0088] The configuration of the porthole 35 is not limited to the example of the above embodiment. The porthole 35 may simply communicate between the inside and outside of the peripheral wall 30. For example, the central axis of the porthole 35 may be inclined obliquely with respect to the central axis C of the peripheral wall 30.

[0089] The following manner may be employed when changing the position of the pin 58 relative to the orifice 45. That is, the position of the pin 58 relative to the orifice 45 may be changed by rotating the peripheral wall 30 relative to the rod 50 while maintaining the position of the rod 50 in the reference axial direction X. In other words, the peripheral wall 30 may be rotated instead of the rod 50.

[0090] The configuration of the flow path forming member 260 is not limited to the example of the above embodiment. The flow path forming member 260 only needs to be able to connect the base flow path 252A, the flow path of the flow control device 10, and the extension flow path 252B. For example, the base flow path 252A may be open at the bottom surface of the mounting recess 262, and the extension flow path 252B may be open at the side surface of the mounting recess 262. In this case, when the flow control device 10 is placed in the mounting recess 262, the opening on the first direction X1 side of the peripheral wall 30 connects to the base flow path 252A, and the opening of the porthole 35 on the outer circumferential surface of the peripheral wall 30 connects to the extension flow path 252B.

[0091] The attachment target of the actuator 210 is not limited to the flap 520. The attachment target of the actuator 210 may be a moving surface other than the flap 520, such as a slat. The attachment target of the actuator 210 may be something other than a moving surface on the aircraft 500. Furthermore, the attachment target of the actuator 210 may be something other than the aircraft 500.

[0092] The installation target of the flow control device 10 is not limited to the supply / discharge flow path 250 that supplies / discharges hydraulic oil to / from the actuator 210. The installation target of the flow control device 10 may also be a hydraulic oil flow path for a purpose other than the actuator 210. Regardless of the type of target flow path, the flow control device 10 will function effectively as long as it is located in the middle of the flow path that requires flow rate adjustment.

[0093] The fluid flowing through the flow rate control device 10 is not limited to hydraulic oil. The fluid may be, for example, air. In the above embodiments, an object composed of multiple objects may be integrated, and conversely, an object composed of a single object may be divided into multiple objects. Regardless of whether they are integrated, it is sufficient that the object of the invention can be achieved. For example, the peripheral wall 30 and the throttle wall 40 do not have to be integrally molded. The same function as in the above embodiment can be achieved by fitting the annular throttle wall 40 into the peripheral wall 30. Similarly, for example, the rod 50 and stopper 55, and the rod 50 and pin 58 do not have to be integrally molded. [Explanation of symbols]

[0094] N...Nut 10...Flow rate adjustment device 20. Housing 25...Main flow path 30...peripheral wall 35...Porthole 38...Regulation groove 38B...First regulatory surface 38C…Second regulatory surface 40...Aperture wall 45...Orifice 50...Rod 55...Stopper 58...pin 70...First lock washer 80...Second lock washer 200...Actuator system 210...Actuator 250…Supply / discharge channel 251...1st supply / discharge channel 252…Second supply / discharge flow path 500...Aircraft 520…Flap

Claims

1. a housing having a cylindrical shape extending along a central axis and including a flow path along the central axis and a port hole branching from the flow path and leading to the outside; a throttle wall located on one side of a branch point of the porthole to the flow passage in a direction along the central axis, the throttle wall protruding from an inner circumferential surface of the housing, the protruding end defining an orifice having a flow passage cross-sectional area smaller than that of other portions within the housing; a rod inserted into the housing from an opening on the opposite side of the housing from the throttle wall across the branch point, and screwed into an inner circumferential surface of the housing; a pin that protrudes from the tip of the rod toward the orifice and that can be inserted into the orifice when the rod moves relative to the housing along the central axis. Flow rate adjustment device.

2. The pin has a columnar shape extending in a direction along the central axis, and the area of ​​a cross section perpendicular to the central axis decreases as the pin moves away from the rod in the direction along the central axis. The flow control device according to claim 1 .

3. the throttle wall has a cylindrical shape centered on an axis line along the central axis line, The flow path cross-sectional area of ​​the orifice defined by the inner circumferential surface of the throttle wall increases with increasing distance from the rod in the direction along the central axis. The flow control device according to claim 1 .

4. a portion of the rod opposite to the side inserted into the housing is exposed to the outside of the housing; a nut threadedly engaging a portion of the rod exposed from the housing; a pair of lock washers positioned between the housing and the nut and aligned in a direction along the central axis; Each of the pair of lock washers has an annular plate shape centered on a washer central axis along the central axis, The surfaces of the pair of lock washers facing each other are divided into a plurality of first cam surfaces and a plurality of second cam surfaces extending radially from the central axis of the washer, the first cam surface is inclined with respect to an imaginary plane perpendicular to the washer central axis so that the thickness of the lock washer in a direction along the washer central axis increases toward one side in a circumferential direction centered on the washer central axis, the second cam surface is inclined with respect to the imaginary plane so that the thickness of the lock washer in a direction along the washer central axis decreases toward the one side in the circumferential direction, The first cam surfaces and the second cam surfaces are arranged alternately in the circumferential direction. The flow control device according to claim 1 .

5. The housing includes: a restriction surface facing the one side in a direction along the central axis, on the opposite side of the branching point from the throttle wall, a stopper that is provided integrally with the rod and that comes into contact with the restriction surface from the one side when the end of the pin opposite to the rod is positioned closer to the rod than the center of the orifice in the direction along the central axis; The flow control device according to claim 1 .

6. Applied to aircraft with multiple moving wings, an actuator provided for each of the rotor blades, the actuator operating in response to fluid pressure to drive the rotor blades; a supply / discharge flow path provided for each of the actuators, for supplying / discharging a fluid to / from the actuator; a flow rate adjusting device provided in the middle of the supply and discharge flow path, The flow rate adjusting device is a housing having a cylindrical shape extending along a central axis and including a flow path along the central axis and a port hole branching from the flow path and leading to the outside; a throttle wall located on one side of a branch point of the porthole to the flow passage in a direction along the central axis, the throttle wall protruding from an inner circumferential surface of the housing, the protruding end defining an orifice having a flow passage cross-sectional area smaller than that of other portions within the housing; a rod inserted into the housing from an opening on the opposite side of the housing from the throttle wall across the branch point, and screwed into an inner circumferential surface of the housing; a pin that protrudes from the tip of the rod toward the orifice and that can be inserted into the orifice when the rod moves relative to the housing along the central axis; The flow path of the flow control device is connected to a portion of the supply / discharge flow path outside the housing through an opening in the outer peripheral surface of the housing at the porthole and an opening in the housing on the opposite side to the side into which the rod is inserted. Actuator systems for aircraft.

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