JPS6315136A - Road simulation apparatus of vehicle - Google Patents

Abstract

PURPOSE:To easily form even a considerably complicated vibration state wherein vibration in both directions are compounded, by providing a vibration means in a vehicle before-and-behind direction in addition to a vibration means in a vehicle up-and-down direction. CONSTITUTION:A road simulation apparatus is provided so as to correspond to each wheel 3 of a vehicle 1 and constituted of a base part 10 supporting the tire 5 of each wheel 3, a first vibration means 11 vibrating the base part 10 in an up-and-down direction, a U-shaped grasping part 12 grasping the axle 2 protruded to the outside of the wheel 3 over a predetermined length in a vehicle before-and-behind direction and a second vibration means 13 vibrating the grasping part 12 in a vehicle up-and-down direction. Therefore, not only the vibration states in vehicle up-and-down and before-and-behind directions can be formed but also a considerably complicated vibration state wherein the vibrations in both directions are compounded can be easily formed and said vibration states can be made approximate to those in an actual running state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a road simulator device for a vehicle.

(Prior Art) Vehicles such as automobiles are generally subjected to various performance tests during their development and performance evaluation after completion of manufacturing.

Among these, vibration ride comfort tests, which measure and evaluate whether a comfortable ride can be maintained in response to actual road surface displacement, are particularly important.
It is equipped with a method for measurement and evaluation by actually driving on a test course with various road surface configurations, and an artificial vibration excitation means, which creates an excitation state for the vehicle according to the shape of the actual road surface. There are two methods of road simulation method for measurement and evaluation.

In the former case, in addition to the equipment itself being much larger, there are practical limits to forming a road surface in a form that corresponds to the actual road surface, and it is impossible to create very complex excitation conditions. It is. Furthermore, measurement conditions tend to change due to changes in external conditions such as the presence or absence of crosswinds. On the other hand, in the latter case, the measurement conditions can always be kept constant, even fairly complex excitation conditions can be formed relatively freely, and the measurement is easy. In this respect, it has an advantage that the former does not have.

Conventionally, this road simulation method has used a road simulator device as described in, for example, Japanese Patent Application Laid-open No. 111433/1983.

That is, this conventional road simulator device is configured to support the axle of a vehicle with an excitation means that vibrates it in the vertical direction, and to measure the vibration damping function of the vehicle by forming only the vibration state in the vertical direction. has been done.

(Problems to be Solved by the Invention) However, in the configuration of the above-mentioned prior art, only vibrations in the vertical direction of the axle are generated, and vibrations corresponding to actual driving conditions in which vibrations in the longitudinal direction of the vehicle act in combination are generated. There is a problem in that it is not possible to realize a vibration state that is consistent with the current state of vibration. In addition, the vibrations in the vertical direction of the vehicle, which are actually applied through the tires whose weight itself is an elastic body, cannot accurately simulate the actual driving conditions unless the vibration state is originally created through the tires. There are also problems that may not be the case.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above problems, and includes a base portion for supporting a tire, a clamping portion for sandwiching the front and rear of an axle, and the base portion. The device includes a first vibration device that vibrates the holding portion in the vertical direction, and a second vibration device that vibrates the clamping portion in the front-rear direction.

(Function) According to the above means, the vertical vibration caused by the first vibration excitation means is transmitted to the vehicle via the tires placed on the base portion.

Further, the longitudinal vibrations caused by the second vibration excitation means are transmitted to the axle via the clamping portion, and apply longitudinal vibrations to the vehicle.

Furthermore, if the first vibration excitation means and the second vibration excitation means are activated simultaneously, diagonal vibrations, which are a combination of vertical vibrations and longitudinal vibrations, are transmitted to the vehicle.

(Embodiment) FIG. 1 shows a road simulator device for a vehicle according to a first embodiment of the present invention.

First, in FIG. 1, reference numeral 1 indicates a vehicle (automobile) to be subjected to vibration measurement, and a wheel 3 is attached to the vehicle 1 with an axle (spindle) 2 protruding outward by a predetermined length. There is.

The vehicle 1 is placed on a road simulator device described below via its tires 5.

The road simulator device includes each wheel 3 of the vehicle 1.
．． 3... (however, in FIG. 1, only one front wheel is shown, and the others are omitted), and the base supports the tire 5 of each wheel 3, 3... Department IO
a first vibration means 11 that vibrates the base portion 10 in the vertical direction; a U-shaped clamping portion 12 that clamps the axle 2 protruding outward by a predetermined length of the axle 3 in the longitudinal direction of the vehicle; A second vibration excitation means 13 vibrates the holding portion 12 in the longitudinal direction of the vehicle.

The base portion IO is constituted by, for example, a rectangular plate-like member sufficient to place the tire 5, and its central lower surface is connected to the piston of the first cylinder 15 constituting the first vibration excitation means 11. It is supported by a rod 16 so as to be able to move up and down in the vertical direction.

Therefore, the base portion 10 is vibrated up and down by the operation of the first cylinder 15 via the piston rod 16 at an arbitrary period and amplitude.

On the other hand, the holding part I2 is a U-shaped rod 17 that is opened upward.
A pair of arm members 18.18 extending in the longitudinal direction of the vehicle are integrally connected to the outer side thereof, and the arm members 18.1
8 are connected and supported on the base portion 10 through support columns 19 and 19, respectively. Then, in consideration of the outer shape of the wheel 3, the axle shaft 2 is attached to the support column 19, 19 so that in the supported state, the axle shaft 2 is fitted into a substantially vertical middle portion of the internal space of the upper gEU-shaped rod 17. height has been determined.

Further, the second vibration excitation means 13 is connected to the first vibration excitation means 11.
A corner portion 21a of an angled link piece 21 is rotatably pivoted to the upper end of a support bracket 20 installed at a predetermined distance toward the front of the vehicle.
1 (swinging end) 21b is pivotally connected to the one side arm member 18 constituting the holding portion 12 via the lever 22,
The other end (operating end) 21c is pivotally connected to the tip of the piston rod 26 of the second cylinder 25 that operates in the vertical direction.

Therefore, when the second cylinder 25 expands and contracts, the link piece 21 alternately rotates in the directions of arrows a and b via its piston rod 26, and this rotation further causes the link piece 21 to rotate via the lever 22 to hold the clamping member. The U-shaped rod 17 of the portion 12 is vibrated and swung in the longitudinal direction of the vehicle.

According to the above configuration, in addition to the first vibration excitation means 10 that vibrates the vehicle in the vertical direction, the second vibration excitation means 13 that vibrates the vehicle in the longitudinal direction is provided. Not only can vibration states in the front-rear direction be created, but also quite complex vibration states in which vibrations in both directions are combined can be easily created, and can be more closely approximated to actual running conditions.

Moreover, the excitation force in the vertical direction of the vehicle is applied to the tire 5 itself via the base portion lO supporting the tire 5, and is transmitted to the vehicle body via the tire. Since the vibrations in the longitudinal direction of the vehicle are applied to the tire 5 through the clamping part 12 consisting of a U-shaped rod 17 that clamps the axle 2 only in the longitudinal direction, the vibration is applied to the tire 5 itself in the vertical direction. Movement is free without being equally constrained, and it is possible to freely reproduce, for example, a situation where the tires 5 rebound due to sudden vibrations in the vertical direction of the vehicle.

Therefore, the degree of approximation to the actual running state becomes even higher.

In addition, a clamping part 12 that clamps the axle 2 in the longitudinal direction of the vehicle
is not limited to the case where the above-mentioned U-shaped rod 17 is used; for example, as a second embodiment, it is constructed by an H-shaped member 17' as shown in FIG. The thickness of the central side 17a' is reduced to form an engagement space A for the axle 2 that extends inwardly in the vertical direction.
7a' may prevent the wheel 2 from shifting in the vehicle width direction.

(Effects of the Invention) As described above, the present invention includes a base part that supports a tire, a clamping part that sandwiches the front and rear of an axle, and a first vibration means that vibrates the base part in the vertical direction. , and a second vibrating means for vibrating the holding portion in the front-rear direction.

Therefore, according to the present invention, in addition to the excitation means in the vertical direction of the vehicle, the excitation means in the longitudinal direction of the vehicle is provided, so that it is possible to create vibration states in both the vertical and longitudinal directions of the vehicle. It is possible to easily create a fairly complex vibration state in which vibrations are combined, and to more closely approximate the actual running state.

Moreover, the excitation force in the vertical direction of the vehicle is applied to the tire itself via the base portion that supports the tire, and is transmitted to the vehicle body via the tire, while the excitation force is applied in the longitudinal direction of the vehicle with respect to the axle. Since the vibration is applied via the clamping part that clamps the axle only in the longitudinal direction, the tire itself can move freely in the vertical direction, and the vibration in the vertical direction of the vehicle You can also freely reproduce situations where the tire rebounds. Therefore, the degree of approximation to the actual running state becomes even higher.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a vehicle road simulator device according to a first embodiment of the present invention, and FIG. 2 is a structure of a clamping portion of a vehicle road simulator device according to a second embodiment of the present invention. FIG. ! ... Vehicle 2 ... Axle 3 ... Wheel 10 ... Base part 11 ... First vibration excitation means 12 ... Clamping part 13 ... Second vibration means

Claims (1)

[Claims] 1. A base part that supports the tire, a clamping part that sandwiches the front and rear sides of the axle, a first vibration means that vibrates the base part in the vertical direction, and a second vibration means that vibrates the clamping part in the front and rear directions. A road simulator device for a vehicle, comprising a vibration excitation means.