JP2740232B2 - Vehicle roll testing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a vehicle roll tester used for measuring basic characteristics of a vehicle suspension.

[Problems to be Solved by the Related Art and the Invention] The vehicle wheels and the vehicle body are connected by a suspension, and the characteristics thereof are important ones that greatly affect the vibration, riding comfort, and maneuverability of the vehicle. Therefore, various measurements are performed using the characteristics of the suspension as basic vehicle characteristics.
One of these is the amount of so-called jack-up, which is a phenomenon in which the vehicle lifts up and becomes unstable due to the lateral force during turning of the vehicle, as well as the load transfer amount, camber angle, toe angle, tread amount, moment, jack It is necessary to measure various characteristics such as the amount and change in roll angle in manufacturing a vehicle.

For example, the jack-up phenomenon occurs when a lateral force required for turning is generated in a tire as in a swing axle suspension, because the lateral force acts as a force to lift the vehicle from the vehicle body based on the geometry of the suspension. Therefore, it is absolutely necessary to know the amount of this jack-up in order to know the suspension characteristics during turning.

Conventionally, in general, the characteristics relating to the amount of jack-up during vehicle turning as described above were obtained by measuring a distance between a vehicle body and the ground while actually turning the vehicle by mounting various measuring devices on the vehicle. It was obtained by measuring motor characteristics with data.

However, when the vehicle actually travels, it is difficult to obtain accurate and stable data because the road surface on which the vehicle travels is not always flat, and various measuring devices must be mounted on the vehicle. There was a problem that sex was troublesome.

Therefore, in recent years, a method has been developed in which a vehicle is mounted on a testing machine for rolling the vehicle, a vehicle main body is fixed, various loads are applied to an axle including a tire, and basic characteristics of the vehicle are measured.

FIGS. 2 and 3 show a conventional example of a vehicle roll tester used to apply a roll to a vehicle. FIGS. 2 (a) and (b) show the basics of a so-called seesaw type tester. It is a block diagram. In the seesaw type, a platform 2 on which an axle 1 is mounted is swingably supported at a fulcrum substantially coinciding with a center line O of the vehicle, and a line connecting a ground point of a tire of the vehicle is always kept parallel to the platform 2. Type. 3 is the platform 2
An actuator that moves up and down as a whole, 4 is a tire, 5 is a vehicle body, 6 is a base, 7 is an actuator for tilting the platform 2, and 8 is a pad on which the tire 4 is mounted. , Left and right, and rotational directions, and displacements and loads in the front, rear, left, right, and rotational directions are detected by detectors (not shown).

On the other hand, FIG. 3 shows a so-called independent type, in which the platforms 2 on which the right and left tires 4 are mounted are individually provided on actuators 7 which are vertically moved independently of each other.

By the way, considering the case of measuring the force in the direction perpendicular to the tire contact surface using these test machines,
Since the pad is always held parallel to the platform surface, the force in the direction perpendicular to the pad surface can be directly measured by the load sensor.However, in the independent type, since the pad is always horizontal with the platform, The component measurements must be corrected by the lateral component.

Therefore, when simulating the turning performance of a vehicle in a turning test, the vehicle performs a turning operation in a state where the centrifugal force acting on the center of gravity of the vehicle body and the lateral acceleration force received on the tire contact surface are balanced. However, since the weight of the vehicle is invariable, the sum of the forces (weights) applied to the ground by the tire contact surfaces of the left and right wheels should always be constant.

Therefore, when performing this type of test, if the condition that the sum of the weights given by the right and left wheels is not satisfied at the same time is satisfied,
I cannot do accurate simulation.

In consideration of the above effects, in the independent formula, after measuring the lateral force of the pad, the tire right angle component is calculated, and as a result the upper and lower loads are driven. Therefore, so-called convergence control must be performed until the same is satisfied until the target weight condition is satisfied.

However, in general, a suspension system has a large hysteresis characteristic (between load and displacement) due to suspension friction, so that it is difficult to stably perform target control by convergence control.

Therefore, a method that does not require weight control in this type of test is desirable.

Then, a seesaw type that does not perform the above weight control will be adopted, but the seesaw type has a structure in which a large load is likely to be applied to the portion of the platform rotation fulcrum, and bending occurs at this portion, It becomes difficult to accurately measure displacement and the like based on the fixed vehicle body. Of course, it is sufficient if this platform has a large rigidity, but this is not practical.

In particular, due to recent improvements in vehicle performance, dynamic performance has also become a measurement target based on static characteristics, and attention has been focused on the above-mentioned independent formula that can provide rigidity that can withstand dynamic motion. However, the stand-alone formula has the above-mentioned problem.

Therefore, the present invention has been made in view of the above points,
It is an object of the present invention to provide a vehicle roll testing machine having sufficient rigidity while eliminating the burden of weight control.

[Means for solving the problem]

In order to solve the above-mentioned problems, a vehicle roll testing machine made according to the present invention comprises a pair of actuators which can move up and down independently of each other, and a tire of a vehicle mounted on a movable base of each actuator so as to be swingable. And a communication guide bar that communicates with the pair of loading tables and is slidably provided with respect to the loading table.

(Operation)

The pair of actuators are moved up and down independently, thereby providing the appropriate axle tilt.

The loading table attached to the tip of the actuator is swingable, and the pair of loading tables is connected by a single connection guide bar. The line connecting the ground points, that is, on the same plane always parallel to the ground plane. Therefore, the pad receives the load from the vehicle in the vertical direction or the parallel direction on the pad surface, and can directly detect the load perpendicular or parallel to the ground contact surface of the tire.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a structural explanatory view of an embodiment of a vehicle roll tester according to the present invention. In FIG. 1, the same reference numerals are used for the same parts as those in the conventional apparatus shown in FIGS. 2 and 3. is there.

The vehicle roll tester includes a pair of actuators 7 controlled independently of each other, a movable pedestal 7a that is driven by the actuator 7 to move up and down, and a support that is swingably supported by a pin 9 at the tip of the movable pedestal 7a. The platform comprises a platform 10, a platform 2 which is the upper surface of the loading platform 10, and a pad 8 provided on the platform 2.

The pair of load bases 10 has a hole 10a penetrating in parallel with the direction of the axle 1 of the vehicle, and a connection guide bar 11 penetrates so as to communicate with the hole 10a. The connection guide bar 11 is slidable in the axial direction with respect to each hole 10a via a bearing 12.

Now, when trying to roll the axle of the vehicle, the pair of actuators 7 are independently driven by the controller,
A predetermined load is applied to the platform 2 from below. As a result, the platform 2 tilts and the axle 1 also tilts.

At this time, since the pair of load bases 10 are swingably supported by the pins 9 and are connected by the connection guide bar 11, the inclination angle of the platform 2 is
Is equal to the line connecting the contact point of the tire 4 to the contact point, that is, the inclination angle of the contact surface. Therefore, the force which the tire 4 receives from the pad 8 which is the ground contact surface is applied to the vertical and horizontal load detecting devices provided in each pad 8 in both directions perpendicular to and parallel to the contact surface. Measured directly by Various characteristics of the vehicle are measured from the measured values and other measured data.

(Effect)

As described above, according to the present invention, since it is a so-called independent type in that a pair of independent actuators individually apply loads to the left and right tires of the vehicle, the rigidity against high cycle operation at the time of measuring dynamic performance is also high. Since it is a so-called seesaw type, since the platform surface is a line connecting the ground contact point of the tire to each pad, that is, a point that is always parallel to the ground surface and is on the same plane on the left and right, the convergence control is performed. As described above, there is no need to perform complicated weight control, and effects such as easy setting of test conditions can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural view showing an embodiment of a vehicle roll testing machine according to the present invention, and FIG. 2 is a structural view of a conventional seesaw type testing machine.
Fig. 3 shows the state when the platform is horizontal, and Fig. 3 (b) shows the state when the platform is tilted. Fig. 3 is a structural diagram of a conventional independent testing machine. 1 ... axle, 2 ... platform, 4 ... tire, 7
…… actuator, 7a …… movable pedestal, 8 …… pad,
10 ... Loading platform, 11 ... Connected guide bar.

Claims (1)

(57) [Claims] 1. A pair of actuators which can move up and down independently of each other, and a pair of force tables each of which is provided on a movable base of each actuator so as to be swingable and on which a pad for mounting a vehicle tire is disposed. A vehicle roll tester, comprising: a connection guide bar which communicates a pair of load tables and is slidably provided on the load table.