JPH049733A - Testing device for basic characteristic of vehicle - Google Patents

Abstract

PURPOSE:To inexpensively measure upper and lower suspension rates by applying a vertical vibration by second upper and lower vibrating actuators to wheels of a vehicle placed on second longitudinally and laterally movable table. CONSTITUTION:Second upper and lower vibrating actuators 21 are secured on a rotary table 20 to be driven in a rotating direction by a rotary actuator 16, second longitudinally and laterally movable table 22 is placed longitudinally and laterally movably on a second vertically movable table 21c formed at the upper end of a piston rod 21 to be reciprocated in the vertical direction of the actuator 21, and vertical vibration is applied to wheels T of a vehicle placed on the table 2 by the actuators 21. Accordingly, a mass to be applied to the actuators 21 is small, and high speed vertical vibration can be applied that much to the wheels T of the vehicle by the actuators 21 smaller in size corresponding thereto. Thus, upper and lower suspensions can be measured inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a basic vehicle characteristic testing device that applies vibrations to a vehicle from an axle and conducts various tests.

[Conventional technology]

Vehicle basic characteristic test equipment has been developed primarily to measure static characteristics, but in recent years, with the diversification of parts around the suspension of automobiles and other vehicles, there has been an increasing need to measure dynamic characteristics as well. It's coming.

Therefore, the basic vehicle characteristics testing device places the vehicle on a vibrator and applies vibrations from the wheels in all directions, including up and down, left and right, and front and back. The structure is such that it can be tested. The exciter in this case has a number of cylinder mechanisms that match the number of wheels on the vehicle being tested, and the wheels are placed on a rotary table attached to the top of the plunger of each cylinder mechanism. .

FIG. 3 is a sectional view showing one of the above-mentioned conventional cylinder mechanisms, and in the figure, an electro-hydraulic servo type vertical vibration actuator 11 is installed on a foundation B. This vertical vibration actuator 11 includes a cylinder lla to which hydraulic pressure is supplied from a servo valve (not shown), and a cylinder 11.
A piston rod Ilb is fitted in a fluid-tight state and is reciprocated in the vertical direction, that is, in the X direction by hydraulic pressure. A table llc has been formed.

On the vertically movable table 1.1c, a longitudinally movable table 12 is placed on its flat surface so as to be movable in the front-back direction (X direction) and the left-right direction (Y direction) via rolling rollers 12a, Further, an electro-hydraulic servo-type longitudinal vibration actuator (located behind the longitudinal-lateral movement table 12 and not shown) and an electro-hydraulic servo-type horizontal vibration actuator 13 are fixed to the peripheral portion thereof. The longitudinal and lateral movement table 12 has a piston rod of a longitudinal vibration actuator connected to one of its front and rear end surfaces, and a piston rod 13a of a left and right vibration actuator 13 to one of its left and right end surfaces. is performed so that when the other actuator applies vibration, the table 12 is allowed to move back and forth and left and right in that direction.

A rotary table 14 is rotatably disposed in the center of the upper surface of the front-rear, left-right movable table 12 via rolling rollers 14a, and a rotary actuator 15 for rotationally driving the rotary table I4 is rotatably disposed in the central recess. It is fixed so that it cannot move in any direction, but can move slightly in the vertical direction. An output shaft 15a of the rotary actuator 15 is connected to the rotary table 14. The rotary table 14 has a configuration in which four piezoelectric three-axis sensors 14b to 14b4 (FIG. 4) are sandwiched between a pair of discs 14c1 and 14cz. Wheels T of a vehicle to be tested are placed on the upper surface of the rotary table 14.

Each of the above piezoelectric three-axis sensors has an appearance as shown in FIG. 5, and has a dynamic or 1! The static force is X,
It is measured as three orthogonal component forces in the Y and X directions, and a charge proportional to the applied force is generated in each component, and a charge signal corresponding to the generated charge is outputted through each electrode. The charge signal output by the sensor is converted into a voltage signal by a charge amplifier.

The sensor has a bolt insertion hole 14c in the center, and by inserting and screwing the center reloading bolt 14d into the bolt insertion hole 14c as shown in FIG. It is assembled under load.

16 is a vertically movable table 11. This is a displacement sensor that detects the amount of vertical displacement of c. Although not shown in the figure, there is also a displacement sensor for detecting the amount of longitudinal and lateral displacement of the longitudinal and lateral movement table 2 caused by the front and rear actuators and the left and right actuators 13, and for detecting the amount of rotation of the rotary table 14 by the rotary actuator 15. A rotation angle sensor is also provided for this purpose.

[Problem to be solved by the invention]

The vehicle basic characteristics testing device configured as described above has a structure in which force can be applied to the wheels T in all directions, and the entire system from the rotary table 4 on which the wheels T of the vehicle are placed to the vertical actuator 11 Due to the large mass, it is difficult to vibrate the wheel T at high speed, and in order to obtain the necessary speed, it is necessary to use a vertical actuator 11 with a large capacity of excitation force, which causes the device to As the size increases, the cost increases significantly.

By the way, in this test, which attempts to measure the vertical suspension rate, which includes important loads such as hydraulic dampers among many measurement items, the vehicle body is fixed, but on the other hand, the piezoelectric 3-axis sensor mentioned above If a piezoelectric element is used and held at a constant pressure for a long period of time, static drift (origin deviation) will occur in the measured value due to the charge retention characteristics of the element. For this reason, in order to perform highly accurate measurement, it is necessary to remove the wheel T from the rotary table and lyse it immediately before measurement. In this way, the vertical actuator 11 can be lowered outside the original measurement range without separating the wheels T from the rotary table 14, but for this purpose, the vertical actuator 11 needs to have a large movement range. be. Therefore,
Although the measurement range in dynamic testing generally does not require a large swing width, and is approximately ±301T1m, a large vertical actuator 11 with a large swing width of 1 is required, which also increases the size of the device. This also increases costs.

SUMMARY OF THE INVENTION Therefore, in view of the problems of the conventional devices described above, it is an object of the present invention to provide a vehicle basic characteristic testing device that can measure the vertical suspension rate without increasing the size of the vertical actuator or significantly increasing the cost. It is said that

[Means for Solving the Problems] In order to solve the above-mentioned problems, the vehicle basic characteristics testing device according to the present invention includes a vertical vibration actuator installed on a foundation, and a reciprocating motion of the vertical vibration actuator in the vertical direction. a vertically movable table formed on the upper end of the piston rod to be moved; a longitudinally and horizontally movable table placed on the vertically movable table so as to be movable in the longitudinal direction and the horizontal direction; a front-rear vibration actuator and a left-right vibration actuator that respectively drive the front-rear, left-right movement table in the front-back and left-right directions; a rotary table rotatably disposed on the front-rear, left-right movement table;
A vehicle basic characteristic testing device comprising a rotary actuator fixed to the longitudinal and lateral movable table and driving the rotary table in a rotational direction, a second vertical vibration actuator fixed on the rotary table; a second vertically movable table formed at the upper end of the piston rod that reciprocates in the vertical direction of the second vertically vibrating actuator; The present invention is characterized in that the vehicle is provided with a second longitudinal and lateral movement table, and the second vertical vibration actuator applies vertical vibration to the wheels of a vehicle placed on the second longitudinal and lateral movement table. .

[Effect]

In the above configuration, the second vertical vibration actuator is fixed on a rotary table that is driven in the rotational direction by the rotary actuator, and the upper end of the piston rod that is reciprocated in the vertical direction of the second vertical vibration actuator is A second longitudinally movable table is placed on the formed second vertically movable table so as to be movable in the longitudinal and horizontal directions, and the wheels of the vehicle placed on the second longitudinally movable table are mounted on the wheels of the vehicle placed on the second longitudinally movable table. Since vertical vibration is applied by the second vertical vibration actuator, the mass applied to the second vertical vibration actuator is small, and the small actuator can apply high-speed vertical vibration to the wheels of the vehicle. can. Of course, the number of parts is increased compared to one in which vertical vibration is applied using a vertical movement actuator installed on the foundation, but this method uses a large-capacity actuator that can apply high-speed vibration to the foundation. The cost increase is extremely small compared to .

[Example〕 Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the vehicle basic characteristic testing device according to the present invention. The same reference numerals are given and detailed explanation thereof is omitted.

In FIG. 1, a rotary table 20 is disposed in the center of the upper surface of the longitudinally movable table 12 so as to be rotatable via rolling rollers 14a, and a rotary table 20 is disposed on the lower surface of the rotary table 20. An output shaft 15a of a rotary actuator 15 is connected to the central concave portion of the rotary actuator 12, which is fixed so as to be immovable in the rotational direction and slightly movable in the vertical direction. An electrohydraulic servo-type second vertical vibration actuator 21 is installed on the upper surface of the rotary table 20 . This second vertical vibration actuator 2J includes a cylinder 21a to which hydraulic pressure is supplied from a servo valve (not shown);
It consists of a piston rod 21b that is fitted in the cylinder 21a in a liquid-tight manner and reciprocated in the vertical direction, that is, in the X direction, by hydraulic pressure, and the upper end of the piston rod 21b has a flat surface perpendicular to the X direction at the top. A second vertically movable table 21,c is formed.

The second vertically movable table 21c has a second vertically movable table 2 on its flat surface, which is movable in the longitudinal direction (X direction) and the horizontal direction (X direction) via rolling rollers 22a.
2 is mounted, and around it, an electro-hydraulic servo-type second longitudinal vibration actuator (not shown), an electro-hydraulic servo-type second left-right vibration actuator, and a second longitudinal-lateral movement table 220 are mounted. Displacement sensors that detect the amount of displacement in the front, back, left, and right directions are fixed. The second longitudinal and lateral movement table 22 includes four piezoelectric three-axis sensors 22b.
1 to 22b (Fig. 2) as a pair of disks 22c and 2
It has a structure in which it is sandwiched by 2c2. The wheels T of the vehicle to be tested are placed on the upper surface of the second longitudinal and lateral movement table 22.

Each of the piezoelectric three-axis sensors 22b+ to 22b4 may be the same as those described above with reference to FIG. , a pair of discs 22c, and 22c2 are assembled with a preload applied between them.

Although not shown in the figure, the amount of longitudinal and lateral displacement of the longitudinally movable table 12 by the displacement sensor, the longitudinal actuator, and the lateral actuator 13 that detects the vertically displaced amount of the vertically movable table 11c and the second vertically movable table 21c is also detected. Displacement sensor and rotary actuator 1 for detection
A rotation angle sensor for detecting the amount of rotation of the rotary table 14 by the rotary table 14 is also provided.

By configuring the above-described members above the rotary table 20 into one unit, when measuring other than the suspension rate that applies high-speed vertical vibration, these can be removed and tests performed with the same configuration as before. I can do it.

As described above, in the apparatus according to the present invention, the second vertical vibration actuator 2 is fixed on the rotary table 20 which is driven in the rotational direction by the rotary actuator 15, and the second vertical vibration actuator 21 is A second vertically movable table 21 formed at the upper end of the piston rod 21a that reciprocates in the vertical direction. A second longitudinal and lateral movement table 22 is placed on C so as to be movable in the longitudinal and lateral directions, and the wheels T of the vehicle placed on the second longitudinal and lateral movement table 22 are subjected to the second vertical movement. Since vertical vibration is applied by the vibration actuator 21, the second
II applied to the vertical movement actuator 21 is small, and a high-speed vertical vibration can be applied to the wheels of the vehicle using a correspondingly small actuator. Of course, the number of parts is increased compared to a system in which vertical vibration is applied using the vertical movement actuator 11 (Fig. 3) installed on the foundation, but it has a large capacity that can apply high-speed vibration to the foundation. The cost increase is extremely small compared to one using an actuator.

In addition, the wheels T of the vehicle are placed on the second vertically movable table 21c, which is movable in the longitudinal and horizontal directions. It can move freely forward, backward, left and right, and can follow the movement of the wheels during vertical suspension rate tests.

〔effect〕

As explained above, according to the present invention, the second vertically vibrating actuator fixed on the rotary table applies vertical vibration to the wheels of a vehicle placed on the second longitudinally and horizontally movable table. The mass applied to the second vertical motion actuator is small, and the small actuator can apply high-speed vertical vibration to the wheels of the vehicle, making it possible to apply high-speed vibration to the foundation. Compared to an actuator that uses a large capacity actuator, it is smaller and has the advantage of being able to measure the vertical suspension rate with a slight increase in cost.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part showing an embodiment of a vehicle basic characteristics testing device according to the present invention, Fig. 2 is a detailed view of a portion of Fig. 1, and Fig. 3 is an example of a conventional vehicle basic characteristics testing device. Figure 4 is a detailed view of a part of Figure 3, Bacteria 5 is a detailed view of another part of Figure 3, Figure 6 is an enlarged cross-section of another part of Figure 3. It is a diagram. B...Basic, 11...Vertical vibration actuator, 1
1b...Piston rod, llc...Vertical movement table, 12...Back and forth movement table, 13...Right and left vibration actuator, 15...Rotation actuator, 2
0... Rotating table, 21... Second vertical vibration actuator, 21b... Piston rod, 21c...
...Second vertically movable table, 22...Second longitudinally and horizontally movable table.

Claims (1)

[Claims] A vertically vibrating actuator installed on a foundation, a vertically movable table formed at the upper end of a piston rod that reciprocates in the vertical direction of the vertically vibrating actuator, and a vertically movable table formed on the top of the vertically movable table. A front-back and left-right movable table mounted so as to be movable in the front-back and left-right directions, and a back-and-forth vibration actuator and a left-right vibration that are fixed to the vertically movable table and drive the front-back, left-right and left-right move tables, respectively, in the front-back and left-right directions. A vehicle basic characteristics testing device comprising an actuator, a rotary table rotatably disposed on the longitudinal and lateral movement table, and a rotary actuator fixed to the longitudinal and lateral movement table and driving the rotary table in a rotational direction. , a second vertically vibrating actuator fixed on the rotary table; and a second vertically movable table formed at the upper end of a piston rod that reciprocates in the vertical direction of the second vertically vibrating actuator. , a second longitudinally movable table mounted on the vertically movable table so as to be movable in the longitudinal direction and the leftward and rightward directions; A vehicle basic characteristic testing device characterized in that vertical vibration is applied by the vertical vibration actuator of No. 2.