JP5394105B2 - Wind tunnel model assembly structure - Google Patents

Description

  The present invention relates to a wind tunnel model assembly structure in which a first model element constituting a part of an outer surface of a wind tunnel model is detachably coupled to a coupled portion of a second model element.

  In a wing model for wind tunnel testing, a rubber plate is fixed to the bottom of the opening formed in the outer plate in order to connect the outer plate of the blade element to the elastic spar, and a screw passing through the rubber plate is screwed into the elastic spar. This is known from Patent Document 1 below.

  Also, in a wing model for wind tunnel testing, a pair of front and rear anchor members are fixed to an elastic spar, the blade element is fitted around the anchor member from the blade tip side, and the blade is fitted with a bolt penetrating the blade element from the blade tip side. It is known from Patent Document 2 below that the element is fastened to the anchor member.

Japanese Unexamined Patent Publication No. 7-27665 JP 2002-168728 A

  By the way, the invention described in the above-mentioned Patent Document 1 exposes a large-diameter opening for inserting a screw into the outer plate of the blade element. There was a possibility of change.

  On the other hand, the invention described in Patent Document 2 can avoid the influence on the aerodynamic characteristics of the wing model because the bolt is not exposed on the surface of the wing element. There was a problem that the work to fix to was troublesome.

  The present invention has been made in view of the above-described circumstances, and the workability of attaching and detaching the first and second model elements is improved without impairing the aerodynamic characteristics of the wind tunnel model in which the first and second model elements are detachable. The purpose is to increase.

  To achieve the above object, according to the first aspect of the present invention, the first model element constituting a part of the outer surface of the wind tunnel model is detachably coupled to the coupled portion of the second model element. In the assembly structure of the wind tunnel model, the guide member provided inside the first model element and the engaged portion of the second model element supported by the guide protrusion protruding from the guide member so as to be swingable A locking member that engages with the guide member, a male screw member that is screwed into the guide member and contacts the locking member, and a tool that opens to the outer surface of the first model element and operates the male screw member A tool insertion hole, and the locking member includes a fulcrum portion that is held in contact with the guide protrusion of the guide member, a pressed portion that can be in contact with the male screw member, and a cover of the second model element. An engagement portion that engages with the engagement portion, and the tool of the first model element The male screw member is rotated by the tool inserted from the insertion hole to press the pressed portion, and the fulcrum portion of the locking member is swung in contact with the guide protrusion of the guide member to thereby engage the engagement member. A wind tunnel model assembly structure is proposed in which the first model element is pressed against the coupled part of the second model element and detachably coupled by pressing the engaged part at a joint part. Is done.

  According to the invention described in claim 2, in addition to the structure of claim 1, an assembly structure of a wind tunnel model is proposed in which the guide member is formed integrally with the first model element. .

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the guide protrusion protruding from the guide member has a magnetic force for attracting the fulcrum portion of the locking member. An assembly structure of a wind tunnel model is proposed.

  The main body portion 11 of the embodiment corresponds to the second model element of the present invention, and the front side step portion 11c and the rear side step portion 11e of the embodiment correspond to the coupled portion of the present invention. The panel portion 12 corresponds to the first model element of the present invention, the glove screw 24 of the embodiment corresponds to the male screw member of the present invention, and the hexagon wrench 25 of the embodiment corresponds to the tool of the present invention.

  According to the configuration of the first aspect, the first model element is positioned on the coupled portion of the second model element in a state where the fulcrum portion of the locking member is engaged with the guide protrusion of the guide member of the first model element When the male screw member that is screwed into the guide member with the tool inserted from the tool insertion hole of the first model element is operated, the locking member whose pressed portion is pressed by the male screw member causes the fulcrum portion to abut the guide protrusion. The first model element can be detachably coupled to the coupled part of the second model element by pressing the engaged part of the second model element by swinging in a state where the first model element is engaged. it can. As described above, the first model element can be attached to and detached from the second model element simply by inserting the tool into the tool insertion hole of the first model element and operating the male screw member. Since the tool insertion hole is only opened on the outer surface of the first model element, the influence on the aerodynamic characteristics of the wind tunnel model can be minimized.

  According to the configuration of the second aspect, since the guide member is formed integrally with the first model element, the number of flying points and the cost can be reduced as compared with the case where they are configured with separate members.

  According to the third aspect of the present invention, since the guide protrusion protruding from the guide member has a magnetic force that attracts the fulcrum portion of the locking member, the guide member is temporarily engaged with the locking member. It is possible to prevent the stop member from falling off and improve the assembly workability.

The side view and top view of a wind tunnel model of an airplane fuselage (first embodiment). FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 1 (first embodiment). FIG. 3 is an enlarged view of a part 3 in FIG. 2 (first embodiment). FIG. 4 is a sectional view taken along line 4-4 of FIG. 3 (first embodiment). FIG. 5 is a view in the direction of arrows 5 in FIG. 3 (first embodiment). Action explanatory drawing corresponding to the above-mentioned Drawing 3 (a 1st embodiment). The figure corresponding to the said FIG. 3 (2nd Embodiment). The figure corresponding to the said FIG. 3 (3rd Embodiment).

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a wind tunnel model M for testing the aerodynamic characteristics of an aircraft fuselage is composed of six segments, which are composed of a nose portion S1, a cockpit portion S2, a front portion. Corresponding to the body part S3, the central body part S4, the rear body part S5 and the tail part S6. The outer shell of the central body portion S4 includes a substantially cylindrical main body portion 11 and a partial cylindrical panel portion 12 that detachably covers a rectangular opening 11a formed on the upper surface of the main body portion 11.

  Next, a structure for detachably coupling the panel portion 12 to the opening 11a of the main body portion 11 will be described with reference to FIGS.

  As shown in FIG. A front step portion 11c that is one step lower than the outer surface is formed, and a rear step portion 11e that is one step lower than the outer surface is formed on the front edge of the rear upper surface 11d of the main body portion 11. . The front contact portion 12a of the panel portion 12 is overlapped with the front step portion 11c of the main body portion 11 and is detachably coupled by the front coupling means 13F, and the rear contact portion 12b of the panel portion 12 is rearward of the main body portion 11. Overlaid on the side step portion 11e and detachably coupled by the rear coupling means 13R, the outer surface of the main body portion 11 and the outer surface of the panel portion 12 are smoothly connected in this coupled state. Since the front coupling means 13F and the rear coupling means 13R have substantially the same structure, the structure of the front coupling means 13F will be described in detail below as a representative example.

  As shown in FIGS. 3 to 5, the front coupling means 13 </ b> F includes a guide member 21 fixed to the inner surface of the panel portion 12, and a member that is swingably supported by the guide member 21 and engages with the main body portion 11. And a stop member 22.

  The guide member 21 is a substantially plate-like member that is elongated in the left-right direction. Are integrally coupled to each other. A boss 21a protrudes upward at the center portion in the left-right direction of the guide member 21, and a so-called potato screw (set screw) 24 is screwed into a female screw 21b penetrating the center portion up and down. A tool insertion hole 12c passes through the panel portion 12 facing above the axis of the female screw 21b, and the tip of the hexagon wrench 25 inserted through the tool insertion hole 12c is fitted into the hexagon hole of the head of the potato screw 24. Thus, the female screw 24 can be rotated.

  It is desirable that the inner diameter of the tool insertion hole 12c be a minimum dimension that allows the hexagon wrench 25 to be inserted, so that an opening formed on the outer surface of the panel portion 12 by the tool insertion hole 12c is possible. In addition, when the hexagon wrench 25 is inserted into the tool insertion hole 12c, the tip can be easily fitted into the hexagon hole of the grommet screw 24.

  The guide member 21 includes a guide projection 21c made of a permanent magnet that protrudes forward. The locking member 22 includes a fulcrum portion 22a that contacts the upper surface of the guide protrusion 21c of the guide member 21, and a pressed portion 22b that extends rearward from the lower portion of the fulcrum portion 22a beyond the lower end opening of the female screw 21b of the guide member 21. , And an engaging portion 22c extending forward in the opposite direction to the pressed portion 22b from below the fulcrum portion 22a. In a state where the fulcrum portion 22a is in contact with the upper surface of the guide projection 21c made of a permanent magnet, the fulcrum portion 22a is attracted to the guide projection 21c so that the locking member 22 does not fall off the guide member 21. Temporarily held.

  The main body portion 11 is formed with a concave portion 11f facing the locking member 22, and the ceiling surface of the concave portion is an engaged portion 11g extending in parallel below the front side step portion 11c. When the fulcrum portion 22a of the locking member 22 is in contact with the upper surface of the guide projection 21c of the guide member 21 (see FIG. 3), the engaging portion 22c of the locking member 22 does not interfere with the recess 11f of the main body portion 11. Furthermore, it is located behind the recess 11f.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  In order to couple the panel portion 12 to the main body portion 11 of the central body portion S4, the front coupling means 13F and the rear coupling means 13R of the panel portion 12 are similarly operated. Hereinafter, the operation of the front coupling means 13F will be described as a representative.

  As shown in FIG. 3, a guide member 21 in which a female screw 24 is screwed in advance with a female screw 21b is fixed to the lower surface of the panel portion 12 with two bolts 23, 23, and the upper surface of the guide protrusion 21c of the guide member 21 is fixed. The fulcrum part 22a of the locking member 22 is engaged with the guide member 21 and the fulcrum part 22a is attracted to the guide projection 21c made of a permanent magnet, whereby the locking member 22 is temporarily held by the guide member 21 so as not to drop off.

  In this state, the panel portion 12 is fitted into the opening 11 a of the main body portion 11, and the front contact portion 12 a of the panel portion 12 is brought into contact with the upper surface of the front step portion 11 c of the main body portion 11. Subsequently, the hexagon wrench 25 is inserted from the tool insertion hole 12c of the panel portion 12 and is fitted into the hexagon hole of the set screw 24, and the hexagon wrench 25 is rotated to advance the set screw 24 downward. As a result, as shown in FIG. 6, the tip of the female screw 24 protruding downward from the female screw 21 b of the guide member 21 presses the pressed portion 22 b of the locking member 22 downward, whereby the guide protrusion 21 c of the guide member 21. The locking member 22 swings counterclockwise in the figure around the fulcrum portion 22a that contacts with the engaging portion 22c, and the engaging portion 22c contacts the engaged portion 11g, which is the ceiling surface of the concave portion 11f of the main body portion 11, from below. Touch.

  As a result, the guide protrusion 21c of the guide member 21 is pushed down by the fulcrum portion 22a of the locking member 22, and the panel portion 12 integrated with the guide member 21 is pushed down, so that the front contact portion 12a becomes the front side of the main body portion 11. The panel portion 12 is joined to the main body portion 11 in pressure contact with the step portion 11c.

  As described above, since the panel portion 12 can be attached to and detached from the main body portion 11 simply by inserting the hexagon wrench 25 into the tool insertion hole 12c of the panel portion 12 and operating the grub screw 24, the workability is greatly improved. . In addition, since the small-diameter tool insertion hole 12c for inserting the hexagon wrench 25 is only opened on the outer surface of the panel portion 12 constituting the outer surface of the wind tunnel model M, the influence on the aerodynamic characteristics of the wind tunnel model M is minimized. be able to.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the guide member 21 is configured as a separate member with respect to the panel portion 12 and is connected by the bolts 23 and 23. However, in the second embodiment, the panel portion 12 and the guide member 21 are combined. Is composed of a single member. With this configuration, the number of parts can be reduced.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, the guide projection 21c of the guide member 21 is formed of a permanent magnet and is attracted so that the locking member 22 is not dropped. However, in the third embodiment, the guide of the guide member 21 is guided. The protrusion 21c is not composed of a permanent magnet. Even in this case, if the upper and lower surfaces of the guide protrusion 21c are sandwiched between the fulcrum part 22a and the pressed part 22b, the locking member 22 can be temporarily held so as not to drop off the guide protrusion 21c.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the female screw 24 is employed as the male thread member, but a normal bolt having a head can be employed.

  In the embodiment, the connection between the panel portion 12 and the main body portion 11 of the central body portion S4 of the airplane wind tunnel model M has been described. However, the present invention can be applied to any connection of any wind tunnel model other than an airplane. .

M Wind tunnel model 11 Body part (second model element)
11c Front side step (joined part)
11e Rear step (joined part)
11g Engaged part 12 Panel part (first model element)
12c Tool insertion hole 21 Guide member 21c Guide protrusion 22 Locking member 22a Support point 22b Pressed portion 22c Engaging portion 24 Immo screw (male screw member)
25 Hexagon wrench (tool)

Claims (3)

Wind tunnel model assembly structure in which the first model element (12) constituting a part of the outer surface of the wind tunnel model (M) is detachably coupled to the coupled portions (11c, 11e) of the second model element (11). And a guide member (21) provided inside the first model element (12),
A locking member (22) that is swingably supported by a guide protrusion (21c) that protrudes from the guide member (21) and engages with an engaged portion (11g) of the second model element (11); ,
A male screw member (24) screwed into the guide member (21) and abutted against the locking member (22);
A tool insertion hole (12c) for inserting a tool (25) for opening the outer surface of the first model element (12) and operating the male screw member (24);
The locking member (22) includes a fulcrum portion (22a) held in contact with and held by the guide protrusion (21c) of the guide member (21), and a pressed portion (abutted on the male screw member (24)). 22b) and an engaging portion (22c) that engages with the engaged portion (11g) of the second model element (11),
The male screw member (24) is rotated by the tool (25) inserted from the tool insertion hole (12c) of the first model element (12) to press the pressed portion (22b), and the locking member ( The fulcrum part (22a) of 22) is swung in a state of being in contact with the guide protrusion (21c) of the guide member (21), and the engaged part (11g) is pressed by the engaging part (22c). Thus, the wind tunnel model assembly structure is characterized in that the first model element (12) is detachably coupled by being brought into pressure contact with the coupled portions (11c, 11e) of the second model element (11).   The wind tunnel model assembly structure according to claim 1, wherein the guide member (21) is formed integrally with the first model element (12).   The guide protrusion (21c) provided on the guide member (21) has a magnetic force for attracting the fulcrum (22a) of the locking member (22). Assembly structure of the described wind tunnel model.

Images