JPS5835435A - Supporting device for object to be measured in wind tunnel balance - Google Patents

Abstract

PURPOSE:To reduce the influence exerted by wind on object to be measured, by a method wherein a stand for the object to be measured, which is installed such that a surface thereof is exposed to the inside of a wind tunnel so as to form a part of the inner surface of the wind tunnel, is miniaturized as much as possible. CONSTITUTION:Tables 2a, 2b, 2c and 2d for an object to be measured are moved according to a wheel distance of an automobile 9 being an object to be measured to couple it to a measuring part 4, a cover 7 is placed to bring it into a use condition, and the wheels of the automobile 9 are secured by the use of wedges. In this device, a part related to the measuring part 4 of a wind tunnel balance exposed to the inside of the wind tunnel is the tables 2a, 2b, 2c and 2d for an object to be measured which have a small area being somewhat sufficient space to cover the wheels of the automobile 9, and thereby, in the measurement, it is entirely prevented from being influenced by wind to which a part except the automobile 9 is exposed. This sharply reduces a measurement error. Additionally, this enables a device to easily correspond to a change in wheel distance due to a difference in the type of automobile.

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 to be measured, there is a problem in that the object stand other than the test object receives a large force from the wind, resulting in large measurement errors. For this reason, some attempts have been made to reduce the measurement error to some extent by setting the maximum range on which the car is placed on the turntable as one object to be measured, or perhaps the wind tunnel of the object to be measured. The area exposed inside was quite large, and there was a problem with large errors.

This invention aims to reduce the influence of wind on the object table by reducing the size of the object table, which is provided with its surface exposed in the wind tunnel so as to form a part of the inner surface of the wind tunnel, as much as possible. 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 the size of the measured object.

The following invention will be explained based on the illustrated embodiments.

In Figures 1 to 6, 1 is a turntable, 2a
, 2b, 2c, 2d are object stands to be measured, 3a, 3b
, 3c, 3d are holes, 4 is measurement part, 5a, 5b, 5C
15d is a moving plotter, 6 is a coupling device, and 7 is a lid.

As shown 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 mounted on a fixed base 10 via a bearing 11. It is supported and its rotational position can be changed at will. 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 as to be able to support one wheel each of a four-wheeled vehicle. , one each is placed in 3b, 3c, and 3d,
When the upper surface is in the measurement state, the upper surface plate 12
The height will match the top of the . .

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 measurement unit 4 receives the force acting on the object to be measured and detects it as each component force, and the force is transferred to the object to be measured 2a.
, 2b, 2C, 2d.
For this purpose, a highly rigid plate-shaped or frame-shaped lid part 4a integrally formed on the lower side is disposed corresponding to the entire area of the holes 3a, 3b, 3c, and 3d, and a detection mechanism is attached to the lid part 4a. 16 are provided. A large number of labels 17 are provided as coupling parts on the upper surface of the panel part 4a so that each of the objects to be measured is coupled to the lid part 4a at a desired position in each hole, and the labels 17 are opened upward.

The moving blocks 5a, 5b, and 5C15d are provided one each for each of the object tables 2a, 2b, 2C, and 2d, and are used to move the corresponding object table to a desired position. It is placed below the measurement target table. Each moving block is moved by a rotating screw and a guide rod, which will be described below. Each of the movable blocks has the same configuration, and has a guide rod insertion hole 18 and a screw rod engagement label 19, as shown in FIGS. 5 and 6 as the block 5a. A drive mechanism consisting of a force id and a drive device for moving each moving block is shown in FIGS. 3 and 4. Figure 3 shows screw rods 20.21.2 screwed onto the sign plate 19 of each moving block.
2.23, respectively, to drive the movable blocks in the vertical direction of the figure. In this case, block 5
A and 5b, 5C and 5d are moved upward and downward in the figure in mutually opposite directions so that they are positioned at vertically symmetrical positions. Spiral rod 2
0, 21, 22, and 23 are screws in opposite directions, and the name plate 19 of the block that is screwed thereto also corresponds to this. In the figure, the left and right sides are almost symmetrical, so to explain the left half, 24 is the drive motor, 25, 26 is the sprocket, 29 is the chino, 2
8 is a rotating shaft, 2 and 30, 31 and 32 are bevel gears that mesh with each other, 33.34 is a rotating shaft with a sliding key, 35.36 is a bevel gear with a sliding keyway, 37.38 is a screw rod 20.
This is a bevel gear fixed to 21. By forward or reverse rotation of the motor 24, the butterfly pins 20, 21 are rotated forward or reverse by the same amount in the same direction, and the moving blocks 5a, 5b
The insert pins 20. are moved toward each other or away from each other.
21. In the right half of the figure, the movement blocks 5c, 5d are similarly moved along the insert pins 22, 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 insert pins 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 reversed. It is designed to move in the direction. In the figure, 39 is a driving motor, 40°, 41 is a sprocket, 42 is a chino, 43 is a rotating shaft, 44 and 45, 46 and 47 are bevel gears that mesh with each other, and 48.49 is a similar butterfly pin with its threaded part. 48
a and 49b are right-handed threads, threaded parts 48b and 4911 are left-handed threaded, 50.51.52.53 are Nando screws screwed into threaded parts 48a, 48b, '49a, and 49b, respectively, 54.55.56 .57 is a gear box that is integrated with the bevel gears 35, 37, 36, and 38, and 58.59 is a guide rod that accommodates the gear boxes 54 and 55.
．． 56 and 57 are connected respectively, 58 is the moving block 5c, 5d, and 59 is the moving block 5a, 5b.
The guide rods are inserted through the respective guide rod insertion holes 1 and 8. When the motor 39 rotates in the forward or reverse direction, the butterfly pins 48 and 49 are rotated by the same amount in opposite directions.
．． 52 and 53 are respectively moved toward or away from each other along each insert pin 48, 49, and accordingly the guide rods 58 and 59 are moved toward or away from each other, and the moving blocks 5a and 5b , 5c; and 5d
The pairs move in the same way. The drive mechanism in FIG. 4 is located below the drive mechanism in FIG.
．． 33.34.43, Insert pin rotating in fixed position 48.49
etc. are supported by bearings on the lower surface of the turntable 1.

Therefore, the moving blocks 5a, 5b, 5c, and 5d are supported on the turntable 1 side and the wind tunnel wall side, are supported independently with respect to the wind tunnel balance, and are supported in the corresponding holes 3a, 3b, and 3C13d, respectively. It is movable.

Coupling device 6//i, object stand 2a, 2b, 2C12d
each of the corresponding moving blocks 5a, 5b, 5c
, 5d and the measurement s4, and is provided corresponding to each object table to be measured and the moving block. Since their configurations are the same, the object table 2a and the moving block 5a will be explained using FIGS. 5 and 6. As seen in FIG. 5, the coupling device 6 includes a frame portion 60 fixed to the object table 2a and surrounding the moving block 5a;
8. A connecting rod 61 and an insert rod 62, which are parallel to each other and extend in the vertical direction, are rotatably supported by the object table 2a and the frame-shaped portion 60.
63 and nuts 64.6 screwed onto the insert pins 62 and 63, respectively.
5, and the nut monthly production 66. formed on the moving block 5a.
67, a gear 68 fixed to the connecting rod 61, and an insert pin 62.
gears 69.70 fixed to each of 63 and meshing with gear 68;
It is made up of. The upper end support hole of the coupling rod 61 is opened on the upper surface of the object to be measured 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. can. Its rotation is gear 68.69.
The insert pins 62, 63 are simultaneously rotated via the pins 70. At the lower end of the connecting rod 61, a threaded part 72 is formed so as to protrude downward from the frame-shaped part 60 as well, and is screwed into the upwardly facing label 17 that is bored in large numbers in the lid part 4a of the measuring part 4. has been done. Each threaded portion 62a of the insert pin 62,63.

Nuts 64.65 are screwed into 63a, and the lower surfaces of the nuts 64.6°5 are tapered 64a and 65a, respectively.
Rotation stopper protrusions 64b and 65b are provided on the sides and are engaged with the frame portion 60 to prevent it from rotating and to be movable up and down. Connecting rod 61, insert pin 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. The nut 66.67 still on the upper surface of the moving block 5a is formed into a tapered seat corresponding to the lower surface of the nut 64.65, and the state shown in FIG. 5 is that the nut 64.65 is seated on the seat 66.67. The connecting rod 61 is in a state separated from the measuring section 4 side. The thread pitch of the threaded portion 72 of the connecting rod 61 is 2.5, the thread pitch of the threaded portions 62a and 63a of the insert pin 62, 63 is 3, the number of teeth of the gear 68 is 65, and the gear 69. The number of teeth in 70 is 35. The state shown in Fig. 5 is a state in which the coupling device 6 couples the object to be measured 2a to the moving block 5a.
a is supported by a moving block.

In this state, when the connecting rod 61 is rotated, the screw rod 6
2.63 and the nut 64.65) The frame portion 60 is lowered and the threaded portion 72 of the connecting rod 61 is attached to the label 17.
When the connecting rod 61 is further rotated and compared, due to the rotation f of the connecting rod 61 and the insert pins 62 and 63, and the difference in the pinch between the threaded portion 72 and the threaded portions 62a and 63a, As the threaded portion 72 is screwed into the sign plate 17, the nut 64.65 gradually moves upward away from the seat 73.74 of the moving block 5a, and finally reaches the state shown in FIG.

In addition, in this process, the tips of the butterfly pins 62 and 63 are attached to the sign plate 1.
It fits into a fitting hole 17a provided in the upper part of the coupling device 7, and functions to prevent the coupling device 6 from rotating. In this state, the object to be measured 2
a is separated from the moving block 5a and is coupled to the measuring section 4 side.

As seen in FIGS. 1 and 2, the lid 7 has holes 3a,
3b, 3c, 3d [On the other hand, it is provided to close the remaining part of the part of the object to be measured 2a, 2b, 2c, 2d that has been moved to the desired position within the range of the hole, and there are several types as shown in the figure. It has become famous because it can completely close the remaining part of the hole even when the object tables 2a, 2b, 2c, and 2d are moved to arbitrary positions. ing. Note 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 by the lid member 7.
a, or by the lid member 7a and the edge of the hole, and does not come into contact with the objects to be measured 2a, 2b, 2c, and 2d.

The object to be measured support device configured in this manner has the object to be measured 2a, 2b set according to the wheel spacing of the automobile, which is the object to be measured.
, 2c, and 2d are moved to a predetermined position and connected to the measuring section 4, and the lid 7 is installed to put them into use.

The sequence of operations is to first remove the lid 7 and operate each of the coupling devices 6 to move the object tables 2a, 2b, 2c, and 2d and their corresponding moving blocks 5a, 5b, and 5c.

5d. As a result, the object tables 2a, 2b, 2(, 2d) separated from the measuring section 4 can be moved together with the corresponding moving blocks 5a, 5b, 5c, 5d.Next, the motors 24, 24a, 39 to move the object stands 2a, 2b, 2c, 2d to correspond to the wheel positions of the automobile.Then, each of the coupling devices 6 is operated to move the object stands 2a, 2b, 2c, 2d to be measured.
2d are each coupled to the lid portion 4a of the measuring section 4. As a result, the moving blocks 5a, 5b, and 5C15d are separated from the corresponding object to be measured 2a, 2b.
, 2c, and 2d are 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 placed so that its wheels are placed on the object stands 2a, 2b, 2c, and 2d, as shown in FIG. The wheels of the automobile 9 are usually fixed with wedges or the like.

In this device, the part related to the measurement part 4 of the wind tunnel balance exposed on the inner surface of the wind tunnel is a measuring object stand 2a having a small area on which the wheels of a car can be placed with a certain degree of margin;
2b, 2c, and 2d, the measurement is hardly affected by the wind hitting parts other than the car. Therefore, measurement errors are significantly reduced compared to conventional devices. Furthermore, since each of the test objects can be adjusted to move within the hole to a desired position, it is possible to accommodate variations in wheel spacing due to differences in automobiles.

Furthermore, in this configuration, the movable 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 movable block and moved. Since the table is separated from the moving block and connected to the observation unit, the weight of the device for moving the table to be measured does not act on the measurement unit at all, so there is no negative effect on measurement accuracy. I have nothing to give.

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 use in a four-wheeled vehicle, it is also possible to implement the device for use in 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.
Although the movement is performed as it is five times, depending on the situation, a part or all of the object to be measured may be configured to move 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 drawings]

FIG. 1 is a schematic plan view of an embodiment of the invention, and FIG. 2 is a schematic plan view of an embodiment of the invention.
, A-A sectional view in the figure, FIG. 3 is a schematic plan view of a part of the moving block to explain one drive mechanism, and FIG. 4 is a schematic plan view of a different part of the moving block to explain the drive mechanism. 5 is an enlarged detailed cross-sectional view taken along the line B--B in FIG. 1, and FIG. 6 is an enlarged detailed cross-sectional view showing the same portion as in FIG. 5 but in a different state. 1... Turntable, 2a, 2b, 2c, 2
d...Measurement object stand, 3a, 3b, 3c, 3d-
Hole, 4...Measuring part, 5a, 5b. 5G, 5d... moving block, 6... coupling device,
7... Lid. Patent applicant Yamato Seiko Co., Ltd. Representative Tetsu Shimizu and two others Misaki 1 Figure X 2 Defense

Claims (3)

[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 wind tunnel corresponding to the desired movement adjustment range of each object table. A hole formed by removing a part of the wall and the object to be measured which is provided 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 section of a wind tunnel balance having a connecting part that connects each of the stands, and a guide and a moving part arranged on the wind tunnel wall side, which are arranged between the measuring part and each of the above-mentioned object stands. (1) A moving block supported by a drive device and movably provided in accordance with a movement adjustment range of the object to be measured, and selecting the object to be measured with respect to the joint portion of the measuring section and the moving block; A device for supporting an object to be measured in a wind tunnel balance, comprising a coupling device for coupling the object to a desired position, and a lid provided on the wind tunnel wall side over the remaining gap of the hole after the object to be measured has been 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 the number of wheels and the same distance between the wheels of multiple types of automobiles. Claim Q) A device for supporting a measured object in a wind tunnel balance according to claim K. (3) The connecting portion of the measurement unit is a plurality of sign plates opened on the large side, each corresponding to a moving position of the object to be measured, and the connecting device is seated on the large side of the moving block. a nut that is formed and supported on the seat and engages with the white side of the object to be measured in a non-rotating manner; a screw rod that is rotatably provided on the object stand and is screwed into the nut; It consists of a connecting rod which is rotatably provided on the table and has one end formed with a male thread that is screwed into the label plate, and the object to be measured is rotated together with the screw rod and the connecting rod. The device to be measured in a wind tunnel balance according to claim 1, wherein the device is selectively coupled to the moving block.