JPS6314893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a device for supporting a measured object in a wind tunnel balance used in wind tunnel experiments for automobiles and the like.

Conventionally, in wind tunnel experiments for automobiles, the object to be measured in a wind tunnel balance has been formed on a turntable because it is necessary to change the direction of the vehicle. When the entire turntable is formed on the object stand, the entire turntable is exposed inside the wind tunnel.
Negative pressure based on wind speed acts on the entire surface of the turntable. The force due to this acting pressure is area x pressure, so it has a very large value. Therefore, the object stand to be measured other than the specimen was subjected to a large amount of force due to the wind, resulting in a problem of large measurement errors. For this reason, some attempts have been made to reduce the measurement error to some extent by setting the maximum area on which the car is placed on the turntable as one object to be measured, but in the end the object is exposed inside the wind tunnel of the object to be measured. The area involved was quite large, and there was a problem with large errors.

As a technical means to solve the above problems, for example, it is possible to form only the position where the car tire touches the ground on the object to be measured. Although this is possible, there remains the problem that it cannot be applied to vehicles of different sizes because the positions where the tires touch the ground are different.

This invention aims to reduce the influence of the wind on the object table by minimizing the size of the object table to be measured whose surface is exposed in the wind tunnel so as to form a part of the inner surface of the wind tunnel. It is an object of the present invention to provide a device for supporting a measured object in a wind tunnel balance that can accommodate differences in support positions depending on the size of the measured object.

The technical means of the present invention provides a plurality of objects to be measured whose surfaces are exposed in the wind tunnel so as to form a part of the inner surface of the wind tunnel, and a desired movement adjustment range of each object to be measured. A hole is formed by removing a part of the wind tunnel wall corresponding to the above, and a hole is formed outside the inner surface of the wind tunnel and moved to a desired movement position corresponding to the movement adjustment range of the object to be measured. A measuring part of a wind tunnel balance having a connecting part to which each of the objects to be measured is connected; a guide and a guide disposed between the measuring part and each of the objects to be measured and installed on the wind tunnel wall side; a moving block supported by a moving drive device and movable in accordance with a movement adjustment range of the object to be measured; and a lid provided on the wind tunnel wall side to cover the remaining gap in the hole after the object to be measured has been moved to a desired position.

According to this technical measure, the object to be measured is connected to the moving block and separated from the measuring section. If the lid is removed in this state, the object table to be measured can be moved together with the moving block to a desired position within the hole. The object stage to be measured is moved to a desired position and then connected to the measuring section. At this time, the object to be measured is separated from the block, and the force acting on the object to be measured is transmitted only to the measuring section. Therefore,
When a lid is attached to the space other than the object to be measured in the hole, only the surface of the object to be measured connected to the measurement section is exposed inside the wind tunnel. The object to be measured can be formed to any desired size, so if the object to be measured is a car, by making the object to be measured as small as possible to support the ground contact area of the tire, it is possible to reduce the size of the object that is directly affected by the wind. The surface area of the measuring table becomes smaller. Even if the measuring object table is formed small, it can be moved, so it can accommodate differences in tire spacing positions of different automobiles.

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 6, 1 is a turntable, 2a, 2b, 2c, and 2d are objects to be measured, and 3
a, 3b, 3c, 3d are holes, 4 is a measurement part, 5a,
5b, 5c, and 5d are moving blocks, 6 is a coupling device, and 7 is a lid.

As seen in FIGS. 1 and 2, the turntable 1 is large enough to support and rotate an object to be measured, for example, a four-wheeled vehicle 9, and is supported by a fixed base 10 via a bearing 11. The rotation position can be changed arbitrarily. The upper surface plate 12 is provided so that its upper surface coincides with the floor surface 13 of the wind tunnel, and a wind tunnel balance 15 (details not shown) is installed between the base 14 and the upper surface plate 12.

In this case, four measuring object stands 2a, 2b, 2c, and 2d are provided so that they can each support one wheel of a four-wheeled vehicle. , 3b, 3c, 3d
One of each is arranged in the inner wall, and its upper surface has a height that corresponds to the upper surface of the upper surface plate 12 in the measurement state, as will be described later.

The holes 3a, 3b, 3c, and 3d are sized to allow the object to be measured to be moved within each hole, corresponding to the size of the vehicle, as shown in FIG.

The measuring section 4 receives the force acting on the object to be measured and detects each component.The measuring section 4 receives the force from the object stands 2a, 2b, 2c, and 2d, and therefore has holes. 3a, 3b, 3c, 3
A highly rigid plate-shaped or frame-shaped board portion 4a integrally formed on the lower side is disposed corresponding to the entire region d, and a detection mechanism 16 is provided for the board portion 4a. A large number of screw holes 17 are bored in the upper surface of the panel 4a as connecting parts so that each of the objects to be measured is connected to the panel 4a at a desired position in each hole, and the screw holes 17 are opened upward. There is.

The moving blocks 5a, 5b, 5c, and 5d are provided one each for each of the object stands 2a, 2b, 2c, and 2d, and are used to move the corresponding object stand to a desired position. It is placed below the object to be measured. Each moving block is moved by a rotating screw and a guide rod, which will be described below. Each of the moving blocks has the same construction, and has a guide rod insertion hole 18 and a screw rod engagement screw hole 19, as shown in FIGS. 5 and 6 as the block 5a. A drive mechanism consisting of a guide and a drive device for moving each moving block is shown in FIGS. 3 and 4. FIG. 3 shows a configuration in which the moving blocks are driven in the vertical direction in the figure along the screw rods 20, 21, 22, and 23 screwed into the screw holes 19 of each moving block. and 5
b, 5c, and 5d are moved vertically in opposite directions to be located at vertically symmetrical positions.
The screw rods 20 and 21, 22 and 23 are threaded in opposite directions, and the screw hole 19 of the block that is screwed into them corresponds to this. In the figure, the left and right sides are approximately symmetrical, so to explain the left half, 24 is a drive motor, 25,
26 is a sprocket, 27 is a chain, 28 is a rotating shaft, 29 and 30, 31 and 32 are bevel gears that mesh with each other, 33 and 34 are rotating shafts with sliding keys, 35 and 36
is a bevel gear with a key groove of a sliding key, and 37 and 38 are bevel gears fixed to the screw rods 20 and 21, respectively. By the forward or reverse rotation of the motor 24, the screw rods 20 and 21 are rotated forward or reverse by the same amount in the same direction, and the moving blocks 5a and 5b move along the screw rods 20 and 21 in a direction toward each other or in a direction away from each other. I am forced to do it. In the right half of the figure, the moving blocks 5c and 5d are similarly moved along the screw rods 22 and 23 by the rotation of the motor 24a.
FIG. 4 shows a configuration in which each moving block is driven in a direction perpendicular to the screw rods 20 to 23. In this case, blocks 5a and 5b and 5c and 5d each form a set, and the left and right sets are in opposite directions. It is starting to move to . In the figure, 39 is a drive motor, 4
0 and 41 are sprockets, 42 is a chain, 43 is a rotating shaft, 44 and 45, 46 and 47 are bevel gears that mesh with each other, and 48 and 49 are similar screw rods, and their threaded portions 4
8a and 49b are right-handed threads, and threaded portions 48b and 49a are left-handed threads, 50, 51, 52, 53
are threaded portions 48a, 48b, 49a, 49, respectively.
Nuts 54, 55, 56, and 57 are screwed into the gear box 54, 55, 56, and 57, which are integral with the gear box that houses the bevel gears 35, 37, 36, and 38, and 58 and 59 are guide rods that connect the gear box 54 and 55, 56 and 57 are connected, and 58 is a moving block 5c, 5d.
Reference numeral 59 is inserted into each guide rod insertion hole 18 of the moving blocks 5a and 5b. motor 39
The screws 48 and 49 are rotated by the same amount in opposite directions by the forward or reverse rotation of the screws 48 and 49, and the nuts 50 and 51, 52 and 53 are moved along the screws 48 and 49 toward or away from each other, respectively. Accordingly, the guide rods 58 and 59 move toward or away from each other, and the sets of moving blocks 5a and 5b and 5c and 5d move in the same way. The drive mechanism in FIG. 4 is located below the drive mechanism in FIG. 3, and the shafts 28, 3 rotate in fixed positions.
3, 34, 43, screw rod 48, 4 rotating in fixed position
9 etc. are supported by bearings on the lower surface of the turntable 1. Therefore, the moving blocks 5a, 5b, 5c,
5d is supported on the turntable 1 side, that is, on the wind tunnel wall side, and is supported independently of the wind tunnel balance, and the corresponding holes 3a, 3b, 3c, 3
It is possible to move within d.

The coupling device 6 connects the object tables 2a, 2b, 2c,
2d to the corresponding moving blocks 5a, 5.
b, 5c, and 5d and the measuring section 4, and is provided corresponding to each object stage to be measured and moving block. Since their configurations are the same, Figures 5 and 6
Using the figure, the object to be measured 2a and the moving block 5a.
I will explain about it. As seen in FIG. 5, the coupling device 6 is rotatably attached to a frame portion 60 surrounding the moving block 5a fixed to the object table 2a, and between the object table 2a and the frame portion 60. A joint rod 61 and a screw rod 62, 6 supported in parallel to each other in the vertical direction
3 and nuts 6 screwed into screw rods 62 and 63, respectively.
4 and 65, nut seats 66 and 67 formed on the moving block 5a, a gear 68 fixed to the coupling rod 61, and a gear 6 fixed to each of the screw rods 62 and 63.
8 and gears 69 and 70 meshing with each other.
The upper end support hole of the coupling rod 61 is open to the upper surface of the object table 2a, and the coupling rod 61 has a hexagonal hole 71 for rotation at the upper end, and can be rotated with a hexagonal wrench. Its rotation is gear 68,6
The screw rods 62 and 63 are simultaneously rotated via screws 9 and 70. At the lower end of the coupling rod 61, a large number of upward screw holes 17 are bored in the panel 4a of the measuring section 4.
A threaded portion 72 that is screwed into the frame portion 60 is formed to protrude below the frame portion 60 . Spiral rod 62,
A nut 64,
65 are screwed together, and the nuts 64 and 65 have tapered lower surfaces 64a and 65a, respectively, and have anti-rotation protrusions 64b and 65b protruding from the sides, which prevent the frame portion 60 from rotating in the proper position. They are engaged so that they can move up and down. Combined rod 61, spiral rod 62,
63 are provided vertically penetrating the moving block 5a, and the through holes are formed sufficiently large so as not to contact the inner circumferential surface of the through holes. Further, the seats 66, 67 for nuts on the upper surface of the moving block 5a are formed into tapered seats corresponding to the lower surfaces of the nuts 64, 65, and in the state shown in FIG. 5, the nuts 64, 65 are seated on the seats 66, 67. The coupling rod 61 is in a state away from the measuring section 4 side. The thread pitch of the threaded portion 72 of the coupling rod 61 is 2.5, the thread pitch of the threaded portions 62a and 63a of the screw rods 62 and 63 is 3,
The number of teeth of gear 68 is 65, and the number of teeth of gears 69 and 70 is 35.
It is. In the state shown in FIG. 5, the coupling device 6 is coupling the object table 2a to the moving block 5a, and the object table 2a is supported by the moving block. In this state, when the connecting rod 61 is rotated, the frame portion 60 is lowered due to the relative rotation between the screw rods 62, 63 and the nuts 64, 65, and the threaded portion 72 of the connecting rod 61 is screwed into the screw hole 17. When the connecting rod 61 is further rotated, the connecting rod 6
1 and the screw rods 62, 63 and the difference in pitch between the threaded portion 72 and the threaded portions 62a, 63a,
As the threaded portion 72 is screwed into the screw hole 17, the nuts 64 and 65 are inserted into the seats 73 and 7 of the moving block 5a.
4 and gradually rises, eventually reaching the state shown in FIG. In addition, in this process, the screw 6
The tips of 2 and 63 fit into a fitting hole 17a provided in the upper part of the screw hole 17, and serve to prevent the coupling device 6 from rotating. In this state, the object to be measured 2a is separated from the moving block 5a and is connected to the measuring section 4 side.

The lid 7, as seen in FIGS. 1 and 2,
With respect to the holes 3a, 3b, 3c, 3d, the object tables 2a, 2b, 2 to be measured are moved to desired positions within the range of the holes.
It is provided so as to close the remaining portions of parts c and 2d, and is divided into several types as shown in the figure and used in combination.
Even when 2b, 2c, and 2d are moved to arbitrary positions, the remaining portion of the hole can be completely closed. It should be noted that the relatively large, i.e. long, lid member 7a is supported at both ends by the edge of the hole, and the relatively small, i.e. short, lid member 7b is supported at both ends by the lid member 7a or by the lid member 7a and the edge of the hole. and does not come into contact with the object tables 2a, 2b, 2c, and 2d.

The object supporting device configured in this way moves the object stands 2a, 2b, 2c, and 2d to predetermined positions according to the wheel spacing of the automobile that is the object to be measured, and connects them to the measuring section 4. The lid 7 is installed and the device is ready for use. The sequence of operations is to first remove the lid 7 and operate each of the coupling devices 6 to remove the object to be measured 2a,
2b, 2c, 2d and their corresponding moving blocks 5a, 5b, 5c, 5d are connected. As a result, the object stand 2 to be measured is separated from the measuring section 4 side.
a, 2b, 2c, and 2d are movable together with the corresponding moving blocks 5a, 5b, 5c, and 5d, respectively. Next, the motors 24, 24a, and 39 are operated to move the object stands 2a, 2b, 2c, and 2d to correspond to the wheel positions of the automobile. Then, each of the coupling devices 6 is operated to
b, 2c, and 2d are each coupled to the panel section 4a of the measuring section 4. As a result, the moving blocks 5a, 5b,
5c and 5d are separated from the corresponding object to be measured, so that the force acting on each of the objects to be measured 2a, 2b, 2c, and 2d is transmitted only to the measuring section 4 side. Next, the lid 7 is installed, and the vehicle 9, which is the object to be measured, is moved so that its wheels are placed on the object stand 2, as shown in FIG.
Just place it so that it rests on a, 2b, 2c, and 2d. The wheels of the automobile 9 are usually fixed with wedges or the like.

In this device, the parts related to the measuring part 4 of the wind tunnel balance that are exposed on the inner surface of the wind tunnel are the object tables 2a, 2b, 2c, and 2d, each having a small area on which the wheels of a car can be placed with a certain amount of margin. It is.
This is because negative pressure, etc. based on the wind speed of the wind tunnel is generated on the inner surface of the wind tunnel, and this effect extends to the measuring section 4 side, but these small-area test object stands 2a, 2b, 2c,
It will be limited only to the exposed surface to the wind of 2d. Measurement errors are therefore significantly reduced compared to conventional devices. Furthermore, since each of the test object stands can be adjusted to move to a desired position within the hole, it is possible to accommodate variations in wheel spacing due to differences in automobiles. Furthermore, in this configuration, the moving block is movably supported by a guide provided on the fixed side and a moving drive device, and the object to be measured is coupled to the moving block and moved. Since the object to be measured is separated from the moving block and connected to the measuring section, the weight of the device for moving the object to be measured does not act on the measuring section at all, so there is no negative effect on measurement accuracy. Never give up. In other words, it is possible to adjust the movement of the object to be measured with a configuration that does not adversely affect measurement accuracy at all.

Although the above embodiment has been described for a four-wheeled vehicle, it is also possible to implement it for a three-wheeled or six-wheeled vehicle, or to share all of these. In addition to automobiles, the present invention can also be applied to cases where the object to be measured is a stepladder structure.

In the above embodiment, since the object to be measured support device is used for an automobile, the position of the object to be measured is symmetrical and can be moved as it is. may be configured such that part or all of the object stage to be measured moves independently.

As described above, according to the present invention, it is possible to provide a device for supporting a device to be measured in a wind tunnel balance that can accommodate differences in objects to be measured and has less measurement error than the conventional device.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an embodiment of the invention, and FIG.
The figure is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a partial schematic plan view for explaining the moving block drive mechanism, and FIG. 4 is a schematic plan view of different parts for explaining the moving block drive mechanism. Figure 5 is B-B of Figure 1.
6 is an enlarged detailed cross-sectional view showing the same part as FIG. 5 in a different state. 1... Turntable, 2a, 2b, 2c, 2d
...Measurement table, 3a, 3b, 3c, 3d...hole, 4
... Measuring section, 5a, 5b, 5c, 5d... Moving block, 6... Coupling device, 7... Lid.

Claims (1)

[Claims] 1. A plurality of object tables whose surfaces are exposed in the wind tunnel so as to form a part of the inner surface of the wind tunnel, and a desired movement adjustment range of each object table. A corresponding hole is formed by cutting out a part of the wind tunnel wall, and a hole is provided outside the inner surface of the wind tunnel corresponding to the movement adjustment range of the object to be measured, and the object is moved to a desired movement position. A measuring part of a wind tunnel balance having a connecting part to which each of the measuring objects is connected, and a guide and a movement that are arranged between the measuring part and each of the measuring objects and installed on the wind tunnel wall side. a moving block that is supported by a drive device and is movable in accordance with a movement adjustment range of the object to be measured; A device for supporting an object to be measured in a wind tunnel balance, comprising: a coupling device for selectively coupling the object to be measured; and a lid provided on the wind tunnel wall side for the gap in the hole when the object to be measured is moved to a desired position. 2. A plurality of sets of each of the object to be measured, the hole, the moving block, and the coupling device are provided on the floor of the wind tunnel so as to correspond to a plurality of types of vehicle wheel numbers and wheel spacings. A device for supporting a measured object in a wind tunnel balance according to claim 1. 3. The connecting portion of the measurement unit is a plurality of screw holes opened on the hole side corresponding to the moving position of the object to be measured, and the connecting device forms a seat on the hole side of the moving block. a nut that is supported by the seat and is engaged in a rotation-stopping manner with the object to be measured side; a screw rod that is rotatably provided on the object to be measured and is screwed into the nut; It consists of a connecting rod rotatably provided on the table and one end formed with a male thread that is screwed into the screw hole, and by rotating the screw rod and the connecting rod together, the object to be measured table is connected to the measuring table. Claim 1 characterized in that it is selectively coupled to a moving block.
A device for supporting a measured object in a wind tunnel balance described in .