Joined structure and method for manufacturing the joined structure

Abstract

To provide a joint structure configured so that shaft center parts can be jointed to a head part without using a fastener, and a manufacturing method for a joint structure.SOLUTION: A reaction link 20 comprises a head 30 rotatably connected to rotating blades, bushes 40 rotatably connected to actuators that drive the rotating blades, and shaft center parts 60 through which the head 30 is joined to the bushes 40. Protrusion parts are formed, along a circumferential direction, on outer peripheries of the head 30 and of the bushes 40. The reaction link further comprises covering materials 70 which are fiber-reinforced plastics that cover the shaft center parts 60, the protrusion part of the head 30 and the protrusion parts of the bushes 40 while tightly adhering to the parts respectively.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a joint structure and a method for manufacturing the joint structure. [Background technology]

[0002] In the composite link described in Patent Document 1, joints are fixed to both ends of a hollow tube with a square cross section, and fiber-reinforced plastic is wound around the hollow tube and the joints. The ends of the hollow tube are inserted into the joints. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 6,324,949 Summary of the Invention [Problem to be solved by the invention]

[0004] In the composite link described in Patent Document 1, fiber-reinforced plastic is wrapped around the hollow tube, including the tip of the joint, to prevent the joint from slipping out. Instead of wrapping fiber-reinforced plastic around the tip of the joint, fastening the joint using a fastener is also conceivable. Therefore, there is a need for a method of joining the hollow tube and the joint without using a fastener. [Means for solving the problem]

[0005] A joining structure that solves the above problem comprises a first member rotatably connected to a mating member, a second member rotatably connected to an actuator that drives the mating member, and an axial core portion that connects the first member and the second member, wherein protrusions are provided circumferentially on the outer peripheries of the first member and the second member, and a covering material that tightly contacts and covers the axial core portion, the protrusions of the first member, and the protrusions of the second member.

[0006] According to the above configuration, the first member and the second member are provided with circumferentially extending protrusions, and the shaft portion is provided with a covering material that tightly contacts and covers the protrusions of the first member and the second member. Therefore, the covering material tightly contacts the protrusions of the first member and the second member, thereby hooking onto the protrusions of the first member and the second member. This allows the shaft portion to be joined to the first member and the second member without using a fastener.

[0007] In the above-mentioned joined structure, it is preferable that at least two of the protrusions are provided on the outer periphery of at least one of the first member and the second member, and that the protrusions closer to the tip of the first member or the second member on which the at least two protrusions are provided have larger outer diameters.

[0008] In the above-described joined structure, it is preferable that at least one of the first member and the second member at least partially cover an end portion of the axial core portion. In the above-described joined structure, it is preferable that the covering material is a fiber reinforced plastic, and an end of the fiber reinforced plastic is covered with a resin.

[0009] A method for manufacturing a joined structure that solves the above-mentioned problems includes a first member rotatably connected to a mating member, a second member rotatably connected to an actuator that drives the mating member, and an axial core portion connecting the first member and the second member, wherein the first member and the second member have circumferentially extending protrusions on their outer peripheries, and a coating material that tightly covers and adheres to the axial core portion, the protrusions of the first member, and the protrusions of the second member. The method includes a covering step of covering the outer periphery of the axial core portion with the coating material, a joining step of inserting the first member into the coating material and joining it to a first end of the axial core portion, and inserting the second member into the coating material and joining it to a second end of the axial core portion, and a heating step of heating and hardening the coating material in a state where the coating material is in close contact with the axial core portion, the protrusions of the first member, and the protrusions of the second member.

[0010] According to the above method, the first member and the second member are provided with circumferentially extending ridges, and the shaft portion is provided with a covering material that tightly contacts and covers the ridges of the first member and the second member. Therefore, the covering material tightly contacts the ridges of the first member and the second member, thereby hooking onto the ridges of the first member and the second member. This allows the shaft portion to be joined to the first member and the second member without using a fastener.

[0011] In the manufacturing method of the above-mentioned joined structure, it is preferable that the first member is bifurcated and has a first arm portion and a second arm portion to which the axial core portion and the second member are respectively connected, has a first part including the first arm portion and a second part including the second arm portion, and after the joining step, the method includes a joining step of joining the first part and the second part. [Effects of the Invention]

[0012] According to the present invention, the shaft portion can be connected without using a fastener. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a perspective view of a portion of a wing on which a rotor surface drive device according to an embodiment is mounted. [Figure 2] FIG. 2 is a side view of the rotor surface drive device of the embodiment. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 4 is a view showing a joint between a second member on the left side and a shaft core portion of the joint structure of the embodiment. [Figure 7] FIG. 10 is a view showing the joint between the second member and the shaft core portion on the right side of the joint structure of the embodiment. [Figure 8] FIG. 4 is a view showing a joint between a first member on the left side and a shaft core portion of the joint structure of the embodiment. [Figure 9] FIG. 4 is a view showing a joint between a first member and a shaft portion on the right side of the joint structure of the embodiment. [Figure 10] 4 is a flowchart showing a method for manufacturing a joint structure according to the embodiment. [Figure 11] FIG. 10 is a view showing a state in which the shaft core portions of the embodiment are connected by a connecting jig. [Figure 12] 10A and 10B are diagrams showing the state in which the shaft core portion of the embodiment is covered with a covering material and cut locations. [Figure 13] FIG. 10 is a view showing a state in which the connecting jig is removed from the axial core portion covered with the covering material of the same embodiment. [Figure 14] FIG. 10 is a diagram showing a state in which a first member and a second member are joined to the left-side shaft core portion covered with the covering material of the same embodiment. [Figure 15] 10 is a diagram showing a joined state between the first member, the second member, and the link body on the left side of the joined structure of the embodiment. FIG. [Figure 16] FIG. 10 is a view showing a state in which a first member and a second member are joined to the right-side shaft core portion covered with the covering material of the same embodiment. [Figure 17] 10 is a diagram showing a joined state between the first member, the second member, and the link body on the right side of the joined structure of the embodiment. FIG. [Figure 18] 10 is a diagram showing a state in which the link body of the joint structure of the embodiment is bent by a jig. FIG. [Figure 19] 10 is a diagram showing a joined state between the first and second members and the shaft core portion on the left side of the modified joined structure. FIG. [Figure 20] 10 is a diagram showing a joined state between the first and second members and the shaft core portion on the right side of the modified joined structure. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, one embodiment of a rotor blade drive device including a connection structure will be described with reference to Figures 1 to 18. For convenience, part of the connection structure between the rotor blade drive device and the rotor blade is omitted in Figures 1 and 2.

[0015] As shown in Fig. 1, the moving surface drive unit 1 is provided on a wing 100 of an aircraft. The moving surface drive unit 1 drives a moving surface 101 of the wing 100 of the aircraft. Examples of aircraft control surfaces that make up the moving surface 101 include an aileron, a rudder, and an elevator. The moving surface drive unit 1 may also drive a moving surface configured as a flap, spoiler, or the like.

[0016] The moving surface drive device 1 includes an actuator 10 and a reaction link 20. The actuator 10 drives the moving surface 101. The reaction link 20 supports a reaction force from the moving surface 101 when the moving surface 101 is driven by the actuator 10. The reaction link 20 is an example of a reaction link for an aircraft. The reaction link 20 is a joined structure in which multiple members are joined together.

[0017] As shown in FIG. 2, actuator 10 rotates rotor blade 101 relative to blade 100. Blade 100 is provided with support 102. Rotor blade 101 is provided with connecting shaft 103. Actuator 10 is connected to support 102 and connecting shaft 103. Rotor blade 101 is provided with fulcrum shaft 104. Fulcrum shaft 104 supports rotor blade 101 rotatably relative to blade 100. Actuator 10 rotates rotor blade 101 around fulcrum shaft 104. Actuator 10 is a hydraulically driven linear actuator. Actuator 10 includes a cylinder 11 and a rod 12. Rod 12 reciprocates in the axial direction of rod 12 as hydraulic oil is supplied to and discharged from cylinder 11. Note that actuator 10 may also be an electromechanical linear actuator including an electric motor, a ball screw mechanism, etc. The tip of rod 12 is rotatably connected to connecting shaft 103. That is, the actuator 10 is directly connected to the rotor blade 101. The tip of the rod 12 may be connected to a horn arm (not shown) connected to the rotor blade 101. That is, the actuator 10 may be indirectly connected to the rotor blade 101. The rotor blade 101 corresponds to the mating member. The fulcrum shaft 104 corresponds to the rotation axis.

[0018] As shown in FIG. 1, the actuator 10 includes a connecting portion 13. The connecting portion 13 is provided on the side of the cylinder 11 opposite to the side from which the rod 12 protrudes. The connecting portion 13 is connected to a support portion 102. The connecting portion 13 includes a shaft 13A that extends in a direction perpendicular to the axial direction of the rod 12. A reaction link 20 is connected to the shaft 13A.

[0019] The reaction link 20 is rotatably connected to both the fulcrum shaft 104 and the shaft 13A of the connecting portion 13. When the moving surface 101 is driven by the actuator 10, the reaction link 20 prevents the load received by the moving side moving surface 101 from directly affecting the fixed side blade 100.

[0020] Next, the operation of the rotor surface drive device 1 will be described. The wing is provided with a hydraulic device (not shown) that supplies hydraulic oil to the actuator 10 based on commands from a flight controller (not shown). The hydraulic device operates to supply and discharge hydraulic oil to and from the cylinder 11 of the actuator 10. As a result, as shown in FIG. 2 , the rod 12 extends or retracts relative to the cylinder 11, causing the moving surface 101 connected to the rod 12 via the connecting shaft 103 to rotate about the fulcrum shaft 104. As the moving surface 101 rotates, the reaction link 20 rotatably supports the shaft 13A, and thereby receives a reaction force from the moving surface 101 when the moving surface 101 is driven by the actuator 10.

[0021] Next, the configuration of the reaction link 20 will be described with reference to FIGS. As shown in Figures 2 and 3, the reaction link 20 includes a head 30, a pair of bushings 40, and a link body 50. The head 30 is rotatably connected to a fulcrum shaft 104. The head 30 includes a through-hole 38 through which the fulcrum shaft 104 passes. The bushing 40 is rotatably connected to the actuator 10. The bushing 40 includes a through-hole 41 through which the shaft 13A passes. The link body 50 connects the head 30 and the bushings 40. The head 30 corresponds to the first member, and the bushings 40 correspond to the second member.

[0022] As shown in FIGS. 4 and 5, the reaction link 20 has a bifurcated Y-shape and includes a pair of bushings 40 and link main bodies 50. The bushing 40 on the left side of the figure is the first bushing 40A, and the bushing 40 on the right side of the figure is the second bushing 40B. The link main body 50 on the left side of the figure is the first link main body 50A, and the link main body 50 on the right side of the figure is the second link main body 50B. The first bushing 40A and the first link main body 50A are connected. The second bushing 40B and the second link main body 50B are connected. The reaction link 20 has a bent portion 51 in the link main body 50. The bent portions 51 of the first link main body 50A and the second link main body 50B are arranged in parallel to the bushings 40. The actuator 10 is located between the first link main body 50A and the second link main body 50B (see FIG. 1). The shape of the reaction link 20 may be straight or J-shaped instead of Y-shaped. When the reaction link 20 is straight or J-shaped, the bushing 40 and the link body 50 are one piece.

[0023] The link main body 50 includes a shaft portion 60 and a covering material 70. The shaft portion 60 joins the head 30 and the bushing 40. The shaft portion 60 is a cylindrical member. It is desirable that the ends of the shaft portion 60 be cylindrical, but portions other than the ends of the shaft portion 60 do not have to be cylindrical. The covering material 70 covers a first joint portion 52 between the head 30 and the shaft portion 60 and a second joint portion 53 between the bushing 40 and the shaft portion 60. The covering material 70 covers the first joint portion 52 and the second joint portion 53 as well as the shaft portion 60.

[0024] The covering material 70 is made of fiber reinforced plastics (FRP). Preferably, the covering material 70 is made of carbon fiber reinforced plastics (CFRP). As the carbon fiber, in addition to PAN-based carbon fiber, pitch-based carbon fiber can be used. The covering material 70 may be made of, for example, glass fiber reinforced plastic (GFRP), long glass fiber reinforced plastic (GMT), boron fiber reinforced plastic (BFRP), aramid fiber reinforced plastic (AFRP, KFRP), polyethylene fiber reinforced plastic (DFRP), Zylon fiber reinforced plastic (ZFRP), etc. The covering material 70 may be a fiber reinforced plastic in which multiple types of fibers are combined, or may be made by combining multiple types of fiber reinforced plastics.

[0025] The covering material 70 is a tow, which is a bundle of fiber bundles (filaments) composed of many single fibers, and is made of the same material. However, the covering material 70 is not limited to this, and may be a single fiber, a filament, a staple yarn obtained by staple spinning, or a braid, which is a braided cord composed of filaments and tow. The covering material 70 is wound around the outer circumferential surface of the axial core portion 60 together with the first joint portion 52 and the second joint portion 53 in a layered state. The covering material 70 is wound in different directions.

[0026] The materials of the head 30 or bushing 40 and the axial core portion 60 vary depending on the component. The head 30 and bushing 40 are formed, for example, from a metal material. Examples of metal materials that can be used for the head 30 and bushing 40 include titanium alloy, chromium-molybdenum steel, nickel-chromium-molybdenum steel, stainless steel, and other known metal materials. The head 30 and bushing 40 may also be formed from materials other than metal. For example, the head 30 and bushing 40 may be formed from a ceramic material, a fiber-reinforced plastic such as CFRP, or various resin materials. The axial core portion 60 is formed from a thermoplastic resin such as a polymer plastic that can be deformed when bent. Therefore, the head 30 or bushing 40 and the axial core portion 60 are made of different materials. The axial core portion 60 may also be formed from a resin material other than polymer plastic or a metal material.

[0027] The head 30 is bifurcated. The head 30 has a first arm 33 and a second arm 34 to which the shaft 60 and the bush 40 are respectively connected. The head 30 has a first section 31 including the first arm 33 and a second section 32 including the second arm 34. The first section 31 and the second section 32 are separable. The first arm 33 is connected to the first link body 50A. The second arm 34 is connected to the second link body 50B. The head 30 is fixed to the shaft 60 and further fixed to the bush 40 by the covering material 70. Here, the reaction link 20 has a bifurcated portion in the head 30, which reduces the curvature of the link body 50, thereby preventing wrinkles from forming in the covering material 70 when bent.

[0028] A fitting structure is provided at a coupling portion 37 between the first portion 31 and the second portion 32 of the head 30. A fulcrum shaft 104 provided on the actuator 10 passes through the head 30. The coupling portion 37 is provided at a through portion 38 through which the fulcrum shaft 104 passes. Only the first portion 31 of the head 30 comes into contact with the fulcrum shaft 104. That is, the coupling portion 37 includes a coupling protrusion 37A and a coupling recess 37B. The coupling protrusion 37A is provided on the first portion 31. The coupling recess 37B is provided on the second portion 32, and comes into contact with the fulcrum shaft 104. A bearing may be provided between the fulcrum shaft 104 and the coupling recess 37B.

[0029] 6 and 7 , the first bushing 40A and the second bushing 40B are joined to the second end 62 of the axial core portion 60 at the second joint portion 53 and are covered with a coating material 70. A recess 42 is provided at the base end of the bushing 40, into which the second end 62 of the axial core portion 60 is inserted. The second end 62 of the axial core portion 60 is inserted into the recess 42 of the bushing 40, and the bushing 40 and the axial core portion 60 are joined together. In other words, the first bushing 40A and the second bushing 40B cover at least a portion of the second end 62 of the axial core portion 60.

[0030] The outer diameter DB of the second end portion 62 of the shaft core portion 60 is smaller than the outer diameter D1 of the first bush 40A and the second bush 40B (DB < D1). The outer peripheral surface near the tip of the bush 40 is provided with a wavy portion 43 formed in a wavy shape. Specifically, in the wavy portion 43 of the bush 40, a first ridge portion 44 and a second ridge portion 45 are formed along the circumferential direction, and the outer diameter D3 between the first ridge portion 44 and the second ridge portion 45 is small and forms a recess 46. The outer diameter D1 of the first ridge portion 44 is larger than the outer diameter D2 of the second ridge portion 45 (D1 > D2). The outer diameter D3 of the recess 46 is smaller than the outer diameter D1 of the first ridge portion 44 and the outer diameter D2 of the second ridge portion 4 so (D3 < D2 < D1). The covering material 70 is provided in close contact with the outer shapes of the bush 40 and the shaft core portion 60 without any gaps. For this reason, even when the bush 40 is pulled, the covering material 70 is caught by the first ridge portion 44 and the second ridge portion 45 of the bush 40, and the shaft core portion 60 and the bush 40 can be coupled without using a fastener or the like. Further, even if the covering material 70 slips off the second ridge portion 45 when further pulled, it can be suppressed that the covering material 70 completely slips off by being caught by the first ridge portion 44.

[0031] The second end portion 72 of the covering material 70 near the bush 40 may allow moisture or the like to penetrate inside by capillary action along the fibers when the covering material is fiber-reinforced plastic. Therefore, the second end portion 72 of the covering material 70 is covered with a coating material 73 such as resin. By covering with the coating material 73, the penetration of moisture or the like can be prevented. The coating material 73 is applied to the second end portion 72 and fixes the covering material 70 and the bush 40.

[0032] As shown in FIGS. 8 and 9, the first portion 31 and the second portion 32 of the head 30 are joined to the first end portion 61 of the shaft core portion 60 at the first joint portion 52 and are covered with the covering material 70. A first recess 35 for inserting the first end portion 61 of the shaft core portion 60 is provided at the tip of the first arm portion 33. The first end portion 61 of the shaft core portion 60 is inserted into the first recess 35, and the first arm portion 33 and the shaft core portion 60 are joined. That is, the first portion 31 and the second portion of the head 30 cover at least a part of the first end portion 61 of the shaft core portion 60.

[0033] The outer diameter DA of the first end portion 61 of the shaft core portion 60 is smaller than the outer diameter D4 of the first arm portion 33 and the second arm portion 34 (DA < D4). The outer peripheral surface near the tip of the first arm portion 33 is formed in a wave shape. Specifically, on the outer peripheral surface near the tip of the first arm portion 33, a first ridge portion 33A and a second ridge portion 33B are formed along the circumferential direction, and the outer diameter D6 between the first ridge portion 33A and the second ridge portion 33B is small and forms a recessed portion 33C. The outer diameter D4 of the first ridge portion 33A is larger than the outer diameter D5 of the second ridge portion 33B (D4 > D5). The outer diameter D6 of the recessed portion 33C is smaller than the outer diameter D4 of the first ridge portion 33A and the outer diameter D5 of the second ridge portion 33B (D6 < D5 < D4). The covering material 70 is provided in close contact with the outer shapes of the first arm portion 33 and the shaft core portion 60 without any gaps. Therefore, even when the head 30 is pulled, the covering material 70 is caught by the first ridge portion 34A and the second ridge portion 34B of the head 30, and the shaft core portion 60 and the head 30 can be coupled without using a fastener or the like. Further, even if the covering material 70 slips off the second ridge portion 33B when pulled further, it can be suppressed that the covering material 70 completely slips off by being caught by the first ridge portion 33A. Similarly, at the tip of the second arm portion 34, a second recessed portion 36 for inserting the shaft core portion 60 is provided. The shaft core portion 60 is inserted into the second recessed portion 36, and the second arm portion 34 and the shaft core portion 60 are joined. The outer peripheral surface near the tip of the second arm portion 34 is formed in a wave shape. Specifically, on the outer peripheral surface near the tip of the second arm portion 34, a first ridge portion 34A and a second ridge portion 34B are formed, and the outer diameter D_{6} between the first ridge portion 34A and the second ridge portion 34B is small and forms a recessed portion 34C. The outer diameter D4 of the first ridge portion 34A is larger than the outer diameter D5 of the second ridge portion 34B (D4 > D5). The outer diameter D6 of the recessed portion 34C is smaller than the outer diameter D4 of the first ridge portion 34A and the outer diameter D5 of the second ridge portion 34B (D6 < D5 < D4). The covering material 70 is provided along the outer shapes of the second arm portion 34 and the shaft core portion 60 without any gaps. Therefore, even if the covering material 70 slips off the second ridge portion 34B when pulled, it can be suppressed that the covering material 70 completely slips off by being caught by the first ridge portion 34A.

[0034] If the covering material 70 is made of fiber-reinforced plastic, there is a risk that moisture or the like may penetrate into the first end 71 of the covering material 70 near the head 30 due to capillary action along the fibers. Therefore, the first end 71 of the covering material 70 is covered with a coating material 73 such as a resin. Covering with the coating material 73 can prevent the penetration of moisture or the like. The coating material 73 is applied to the first end 71 and fixes the covering material 70 to the head 30. Note that it is preferable that the resin used for the coating material 73 is the same as the resin used to impregnate the fibers of the fiber-reinforced plastic, as this has high affinity.

[0035] The link body 50 connects the head 30 and the bush 40 with the axial core 60 made of resin and the covering material 70 made of fiber-reinforced plastic, so that it can be made lighter while maintaining the necessary strength.

[0036] Next, a method for manufacturing the reaction link 20 will be described with reference to FIGS. As shown in FIG. 10, the method for manufacturing the reaction link 20 includes a covering step (step S1), a joining step (step S2), a bonding step (step S3), a bending step (step S4), a heating step (step S5), and a coating step (step S6).

[0037] 11, multiple axial core portions 60 are connected to each other with a connecting jig 90, and connecting jigs 90 are also connected to both ends of the axial core portions 60. In this way, the covering work can be performed collectively on multiple axial core portions 60. Note that the number of axial core portions 60 connected by the connecting jig 90 is not limited to two, but three or more axial core portions 60 may also be connected.

[0038] 12, in the covering process of step S1, the multiple axial core portions 60 connected by the connecting jig 90 are covered with a covering material 70. The covering material 70 is wound around not only the axial core portions 60 but also the connecting jig 90 in a stacked state. Specifically, an impregnation liquid tank containing a thermosetting resin (e.g., unsaturated polyester) is prepared as an impregnation liquid. Then, fibers extending from a winding machine (not shown) for winding the fibers around the axial core portions 60 are impregnated into the impregnation liquid tank. Note that, instead of unsaturated polyester, epoxy resin, polyamide resin, or phenol resin may be used as the impregnation liquid. Furthermore, instead of the thermosetting resin, ultraviolet curing resin, photocuring resin, thermoplastic resin (e.g., methyl methacrylate), etc. may be used. The fibers impregnated with the thermosetting resin are wound around the axial core portions 60 while being woven by the winding machine. The fibers are wound around the first joint portion 52, the axial core portion 60, and the second joint portion 53 so that the braided fibers form two layers. In the covering process, the link body portion 50 is formed. The fibers are exposed at both ends of the covering material 70.

[0039] Next, as shown in Fig. 12, the covering material 70 is cut at the portion of the connecting jig 90 that connects the axial core portions 60. Note that it is sufficient to cut only the covering material 70, but the connecting jig 90 may also be cut. Thereafter, as shown in Fig. 13, the connecting jig 90 is removed from both ends of the axial core portions 60.

[0040] 14 and 15, in the joining process of step S2, the first portion 31 of the head 30 is inserted into the tube formed by the coating material 70 coating the axial core portion 60. Then, the first portion 31 of the head 30 is joined to the first end portion 61 of the axial core portion 60. At the first joining portion 52, the first end portion 61 of the axial core portion 60 is inserted into the first recess 35 of the first arm portion 33 of the head 30. Also, the first bushing 40A of the bushing 40 is inserted into the tube formed by the coating material 70 coating the axial core portion 60. Then, the first bushing 40A of the bushing 40 is joined to the second end portion 62 of the axial core portion 60. At the second joining portion 53, the second end portion 62 of the axial core portion 60 is inserted into the recess 42 of the bushing 40. In this way, the coating material 70 is wound in a layered state from the first arm portion 33 of the first portion 31 to the corrugated portion 43 of the first bushing 40A.

[0041] Similarly, as shown in FIGS. 16 and 17 , in the joining process of step S2, the second portion 32 of the head 30 is inserted into the tube formed by the coating material 70 coating the axial core portion 60. Then, the second portion 32 of the head 30 is joined to the first end portion 61 of the axial core portion 60. At the first joining portion 52, the first end portion 61 of the axial core portion 60 is inserted into the second recess 36 of the second arm portion 34 of the head 30. Also, the second bushing 40B of the bushing 40 is inserted into the tube formed by the coating material 70 coating the axial core portion 60. Then, the second bushing 40B of the bushing 40 is joined to the second end portion 62 of the axial core portion 60. At the second joining portion 53, the second end portion 62 of the axial core portion 60 is inserted into the recess 42 of the bushing 40. In this way, the coating material 70 is wound in a layered state from the second arm portion 34 of the second portion 32 to the corrugated portion 43 of the second bushing 40B.

[0042] 4 and 5, in the joining process of step S3, the first part 31 and the second part 32 of the head 30 are joined together. The joining is achieved by fitting the joining convex part 37A of the first part 31 into the joining concave part 37B of the second part 32, and the first part 31 and the second part 32 are fastened together with a screw.

[0043] Next, as shown in FIG. 18 , in the bending process of step S4, the head 30, the shaft portion 60, and the bushings 40 covered with the coating material 70 are placed on a jig 80, and the shaft portion 60 is bent at a position different from the first joint 52 between the head 30 and the shaft portion 60. That is, a head fixing shaft 81 that fixes the head 30 is inserted through the through-hole 38 of the head 30, and the position of the head 30 is fixed. The reaction link 20 is placed on the jig 80 with the link main body 50 in the straight line shown in FIGS. 15 and 17 . Then, the bending portion fixing portion 82 presses the vicinity of the center of the link main body 50, thereby bending the link main body 50. The bending portion fixing portion 82 presses the pair of link main bodies 50 until they are parallel and fixes them in that position. Once the pair of link main bodies 50 are parallel, a bushing fixing shaft 83 is inserted through each of the through-holes 41 of the bushings 40, and the positions of the pair of bushings 40 are fixed. Here, when the link body 50 is bent, the position of the first joint 52 between the head 30 and the shaft core 60 is different, so it is possible to prevent wrinkles from forming in the fiber reinforced plastic covering material 70. This is particularly effective when the first joint 52 has a wavy shape to prevent it from coming loose.

[0044] Next, as shown in Figure 18, in the heating process of step S5, the covering material 70 is hardened by heating. The reaction link 20 is placed in a vacuum chamber while fixed to the jig 80 and heated. The covering material 70 is hardened by heating. Note that if an ultraviolet-curable resin is used as the impregnating liquid instead of a thermosetting resin, the resin impregnated in the fibers is hardened by irradiating the link main body 50 with ultraviolet light in the heating process.

[0045] Subsequently, as shown in FIG. 4, in the coating process of step S6, a coating material 73 is applied to the head 30 and the bushing 40 so as to cover the first end 71 and the second end 72 of the covering material 70.

[0046] The operation of the reaction link 20 will be described with reference to FIG. As shown in FIG. 2 , when a reaction force is applied to the actuator 10 when the actuator 10 is driven to move the rotor surface 101, a tensile load, a compressive load, or a torsional load is applied to the bushing 40 via the shaft 13A connecting the actuator 10 and the reaction link 20. The covering material 70 covers the first joint 52 and the second joint 53. The covering material 70 is also wrapped around the link body 50 without interruption from the head 30 to the bushing 40. Therefore, when a tensile load, a compressive load, or a torsional load is applied to the bushing 40, the covering material 70 bears the force. This allows the link body 50 to be lightweight while maintaining the necessary strength. Even if water droplets adhere to the reaction link 20 due to changes in atmospheric pressure, for example, the end of the covering material 70 is covered with the coating material 73, preventing moisture from penetrating into the covering material 70. In the through portion 38 of the head 30, only the connecting protrusion 37A of the first part 31 comes into contact with the axis 13A of the connecting part 13, and the connecting protrusion 37A comes into contact with the connecting recess 37B. Therefore, even if the first part 31 or the second part 32 of the head 30 and the axis core part 60 are broken, the connection between the head 30 and the axis 13A is maintained, and the load-bearing capacity can be maintained.

[0047] Next, the effects of this embodiment will be described. (1) The covering material 70 is made of fiber-reinforced plastic and tightly covers the shaft portion 60, the first and second protrusions 34A and 34B of the head 30, and the first and second protrusions 44 and 45 of the bushing 40. As a result, the covering material 70 tightly contacts the first and second protrusions 34A and 34B of the head 30 and the first and second protrusions 44 and 45 of the bushing 40, so that the covering material 70 is caught on the first and second protrusions 34A and 34B of the head 30 and the first and second protrusions 44 and 45 of the bushing 40. Therefore, the shaft portion 60, the head 30, and the bushing 40 can be joined together without using a fastener.

[0048] (2) The outer diameter D3 of the two first protrusions 33A, 34A and the outer diameter D4 of the second protrusions 33B, 34B become larger toward the tip of the head 30. Therefore, even if the head 30 is pulled and the covering material 70 comes off the first first protrusion 33A, 34A, the covering material 70 will be caught on the second second protrusion 33B, 34B, preventing the covering material 70 from coming off completely. Furthermore, the outer diameter D1 of the two first protrusions 44 and the outer diameter D2 of the second protrusion 45 become larger toward the tip of the bushing 40. Therefore, even if the bushing 40 is pulled and the covering material 70 comes off the first first protrusion 44, the covering material 70 will be caught on the second second protrusion 45, preventing the covering material 70 from coming off completely.

[0049] (3) At the first joint portion 52, the head 30 at least partially covers the end of the axial core portion 60, and therefore the coating material 70 adheres tightly to the head 30 covering the end of the axial core portion 60, thereby further strengthening the bond between the head 30 and the axial core portion 60. At the second joint portion 53, the bushing 40 at least partially covers the end of the axial core portion 60, and therefore the coating material 70 adheres tightly to the bushing 40 covering the end of the axial core portion 60, thereby further strengthening the bond between the bushing 40 and the axial core portion 60.

[0050] (4) By covering the first end 71 and the second end 72 of the covering material 70, which is fiber-reinforced plastic, with the coating material 73, which is resin, it is possible to prevent moisture and the like from penetrating into the fiber-reinforced plastic.

[0051] (5) Because the head 30 can be separated into the first part 31 and the second part 32, the first part 31 and the second part 32 can be joined to the shaft part 60 and the bushing 40 separately and fixed with the covering material 70 before being joined together. This simplifies the process of installing the head 30, the shaft part 60, and the bushing 40 in a tool such as a jig.

[0052] (Other embodiments) 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.

[0053] In the above embodiment, the first end 71 of the covering material 70 is covered with the coating material 73 such as resin, but the first end 71 of the covering material 70 does not have to be covered with the coating material such as resin. In the above embodiment, the second end 72 of the covering material 70 is covered with the coating material 73 such as resin, but the second end 72 of the covering material 70 does not have to be covered with the coating material such as resin.

[0054] In the above embodiment, the head 30 covers at least a portion of the end of the shaft portion 60 , but the head 30 does not have to cover the end of the shaft portion 60 . In the above embodiment, the bushing 40 covers at least a portion of the end of the shaft core portion 60 , but the bushing 40 does not have to cover the end of the shaft core portion 60 .

[0055] In the above embodiment, two first ridges 33A, 34A and two second ridges 33B, 34B are provided on the outer peripheral surface of the head 30. However, three or more ridges may be provided on the outer peripheral surface of the head 30. The outer diameters of these ridges are larger the closer to the tip of the head 30. Also, only one ridge may be provided on the outer peripheral surface of the head 30.

[0056] In the above embodiment, two protrusions, a first protrusion 44 and a second protrusion 45, are provided on the outer peripheral surface of the bushing 40. However, three or more protrusions may be provided on the outer peripheral surface of the bushing 40. The outer diameters of these protrusions are larger the closer to the tip of the bushing 40. Also, only one protrusion may be provided on the outer peripheral surface of the bushing 40.

[0057] In the above embodiment, the second joint portion 53 of the first bushing 40A and the second bushing 40B has the same shape and outer diameter, but at least one of the shape and outer diameter of the second joint portion 53 of the first bushing 40A and the second bushing 40B may be different.

[0058] In the above embodiment, the first joint 52 between the first arm 33 and the second arm 34 of the head 30 has the same shape and outer diameter, but at least one of the shape and outer diameter of the first joint 52 between the first arm 33 and the second arm 34 may be different.

[0059] In the above embodiment, the covering step (step S1) of covering the shaft portion 60 with the covering material 70 was followed by the joining step (step S2) of joining the head 30 and the bushing 40 to the link body 50. However, the joining step (step S1) of joining the head 30 and the bushing 40 to the shaft portion 60 may be followed by the covering step (step S2) of covering the shaft portion 60, the head 30, and the bushing 40 with the covering material 70. The joining step of the head 30 is performed after the covering step. That is, as shown in FIGS. 19 and 20 , in the joining step of step S1, the first portion 31 of the head 30 is joined to the first end 61 of the shaft portion 60. The first end 61 of the shaft portion 60 is inserted into the first recess 35 of the first arm portion 33 of the head 30 at the first joining portion 52. Similarly, the first bushing 40A of the bushing 40 is joined to the second end 62 of the shaft portion 60. The second end 62 of the axial core portion 60 is inserted into the recess 42 of the bushing 40 at the second joint portion 53. Next, as shown in FIGS. 15 and 17 , in the covering process of step S2, the first joint portion 52 between the head 30 and the axial core portion 60 and the second joint portion 53 between the bushing 40 and the axial core portion 60 are covered with a covering material 70. The covering material 70 is wound in a layered state from the first arm portion 33 of the first part 31 to the corrugated portion 43 of the first bushing 40A. Similarly, the covering material 70 is wound in a layered state from the second arm portion 34 of the second part 32 to the corrugated portion 43 of the second bushing 40B.

[0060] In the above embodiment, the shape of the protrusions may be any shape, such as a semicircular, square, or triangular cross section. Also, protrusions or hemispheres may be provided at intervals on the outer periphery of the head 30 and the bush 40.

[0061] In the above embodiment, only the first portion 31 of the head 30 comes into contact with the fulcrum shaft 104. However, only the second portion 32 of the head 30 may come into contact with the fulcrum shaft 104. Alternatively, both the first portion 31 and the second portion 32 of the head 30 may come into contact with the fulcrum shaft 104.

[0062] In the above embodiment, the joint 37 between the first part 31 and the second part 32 of the head 30 has an interlocking structure, but the joint 37 between the first part 31 and the second part 32 of the head 30 does not necessarily have to have an interlocking structure.

[0063] In the above embodiment, the head 30 is separable into the first portion 31 and the second portion 32, but the first portion 31 and the second portion 32 may be integrated. In the above embodiment, the head 30, the bushing 40, and the shaft portion 60 are made of different materials, but the head 30, the bushing 40, and the shaft portion 60 may be made of the same material.

[0064] In the above embodiment, the first member rotatably connected to the mating member and the second member rotatably connected to the actuator that drives the mating member may be members other than the head 30 and the bush 40 .

[0065] In the above embodiment, in the covering step, the fibers may be immersed in an impregnation liquid bath after being wound around the axial core portion 60. Furthermore, the resin impregnation may be performed by spraying a resin such as a thermosetting resin, an ultraviolet curing resin, a photocuring resin, or a thermoplastic resin onto the fibers, instead of immersing the fibers in a liquid bath.

[0066] In the above embodiments, if an object is made up of multiple objects, the multiple objects may be integrated, and conversely, if an object is made up of a single object, it may be divided into multiple objects. Regardless of whether the objects are integrated or not, it is sufficient that the object of the invention can be achieved. [Explanation of symbols]

[0067] 1...Moving surface drive unit 10...Actuator 11...Cylinder 12...Piston 13...Connection part 13A…Axis 20...Reaction link (connecting structure) 30...Head (first member) 31…Part 1 32…Part 2 33...First arm 33A…First protrusion part 33B…Second protrusion part 34...Second arm 34A…First protrusion part 34B…Second protrusion part 34C...recess 35...First recess 36...Second recess 37...Joining part 37A...Convex joint 37B...Coupling recess 38...Penetration section 40...Bush (second member) 40A...First bush 40B...Second bush 41...Through hole 42...recess 43...Wavy part 44...First protrusion 45...Second ridge 46...recess 50...Link body 50A...First link body 50B...Second link body 51...Bent section 52...1st joint 53…Second joint part 60…Axis core part 61...First end 62…Second end 70...Covering material (fiber reinforced plastic) 71...First end 72…Second end 73...Coating material 80...Jig 81...Head fixing shaft 82...Bending section fixing section 83...Bush fixed shaft 90...Connection jig 100...wings 101...moving blade (mating member) 102...Support part 103...Connection shaft 104...Fulcrum axis

Claims

1. a first member rotatably coupled to a mating member; a second member rotatably connected to an actuator that drives the mating member; a shaft portion connecting the first member and the second member, A protrusion is provided on an outer periphery of the first member and the second member along a circumferential direction centered on the central axis of the shaft core portion, a covering material that closely covers the axial core portion, the protruding portion of the first member, and the protruding portion of the second member, At least two of the protrusions are provided on the outer periphery of at least one of the first member and the second member, The outer diameter of the protrusions closer to the axial core portion of the first member or the second member on which the at least two protrusions are provided is larger. bonded structure.

2. At least one of the first member and the second member covers at least a portion of the end of the shaft portion. The bonded structure according to claim 1 .

3. The coating material is a fiber-reinforced plastic, The end of the fiber reinforced plastic is covered with resin. The bonded structure according to claim 1 or 2.

4. a first member rotatably coupled to a mating member; a second member rotatably connected to an actuator that drives the mating member; a shaft portion connecting the first member and the second member, A protrusion is provided on the outer periphery of the first member and the second member along a circumferential direction, A method for manufacturing a joined structure including a covering material that closely covers the shaft portion, the protruding portion of the first member, and the protruding portion of the second member, a coating step of covering an outer periphery of the shaft core portion with the coating material; a joining step of inserting the first member into the covering material and joining it to a first end of the axial core portion, and inserting the second member into the covering material and joining it to a second end of the axial core portion; a heating step of heating and hardening the covering material in a state in which the covering material is in close contact with the axial core portion, the protruding portion of the first member, and the protruding portion of the second member. A method for manufacturing a bonded structure.

5. the first member is bifurcated and includes a first arm portion and a second arm portion to which the axial core portion and the second member are respectively connected, and has a first portion including the first arm portion and a second portion including the second arm portion; a joining step of joining the first part and the second part after the joining step. The method for manufacturing the bonded structure according to claim 4 .

Images