JPS5844358Y2 - Connection device between piston rod and support member in vibration test equipment - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is applied to a coupling device between a piston rod and a support member in a vibration testing device used to test the durability of a vehicle body or undercarriage frame, such as an automobile. It is related to.

``Prior Art'' Generally, in durability tests of car bodies, it is extremely difficult to drive the entire distance required for the test due to time constraints and economical considerations. The vehicle is driven a certain distance based on load conditions, road surface conditions, etc., and data on temporal changes such as acceleration in the axle position of the chassis frame is input and stored in a storage device.

Then, a support member that supports the chassis frame is connected to the tip of the piston rod of a vibration testing device equipped with a plurality of vibrators having piston rods that slide in a pulsating manner, and the data is stored in the storage device described above. By repeatedly inputting signals to the vibrator, vibration characteristics similar to those of actual driving are imparted to the vehicle body and chassis frame under test, and the vibrations are continued until the distance corresponds to the distance required for the vibration test. Durability tests are being conducted by.

By the way, when attaching a chassis frame in a conventional vibration testing device, two support members in the width direction are fixed at positions corresponding to the axles of the chassis frame, and four support members are attached perpendicularly to the tip of each of these support members. It was connected to the piston rod of the vibrator with a bolt through a rubber washer.

Moreover, as described below, some of the vibrating machines had a base end having a shaft-mounted structure.

However, in such conventional connections, the two ends of the support member are connected by vertical movement of the piston rod corresponding to horizontal shaking, pitching, bouncing, or a combination of these movements. The parts are independently displaced up and down, and accordingly, the distance between the connecting parts of the support member changes, and the support member is tilted with respect to the horizontal direction.

Conventionally, such fluctuations have been followed by deformation of the rubber washer, and especially when an empty freight vehicle runs on an uneven road surface, the difference in left and right displacement of the rear wheels is small and Since the frequency is also dog, in order to follow the high frequency and dog tilt of the corresponding support member,
Since a rubber washer alone was insufficient, only the rear vibrator had a shaft-mounted structure at its base end.

In such conventional methods, it is difficult for the joint to smoothly follow the fluctuations, and there is a risk that excessive force will be applied to the joint, causing the bolt to loosen or break.

Further, there is a problem in that it is difficult to ensure reproduction accuracy for input signals.

``Purpose of the invention'' This invention eliminates the above-mentioned drawbacks, increases the durability of the joint between the piston rod and the support member in the vibration testing device, and
The purpose of this is to improve reproduction accuracy by making it possible to respond smoothly to input signals.

"Structure of the Device" In order to achieve the above object, this device has spherical bodies attached to both ends of a horizontal support member that supports the test object, and at least one end of the support member that extends in the direction of extension of the support member. A shaft is formed, the shaft is slidably inserted into the spherical body, and the spherical body is supported by concave spherical surfaces provided on opposing surfaces of a pair of opposing coupling plates and matching the outer surface shape of the spherical body. This is a coupling device for a piston rod and a support member in a vibration testing apparatus in which the coupling plate is rotatably and slidably clamped and the coupling plate is fixed to a piston rod of a vertical vibrator.

Next, one embodiment of this invention will be described.

FIG. 1 shows an automobile chassis frame as an example of the test object 1, in which reference numeral 2 denotes a front wheel axle suspension spring attachment portion, and 3 denotes a rear wheel axle suspension spring attachment portion.

A plate 6, which serves as a dummy rear spring, is attached to the lower side of the rear axle suspension spring attachment part 3 by brackets 4 and 5. 07 is a plurality of vertical vibration exciters that constitute a vibration testing device. Each of the hydraulic cylinders has a vertical hydraulic cylinder 8 and a pulsating piston rod 9, to the upper end of which a coupling device 11 is attached via a bracket 10.

As in the past, the base end of the front vibration exciter 7 is fixedly attached, and the base end of the rear vibration exciter 7 is pivotally attached to the base end by a shaft parallel to the front-rear direction.

In the illustrated embodiment, the base end of the rear vibrator 7 has a shaft-mounted structure, but it may have a fixed structure.

The aforementioned front wheel axle suspension spring mounting portion 2 of the test object 1 is attached to a beam-shaped horizontal support member 13 via a plate 12.
The plate 6 of the rear axle suspension spring mounting portion 3 is fixed to a horizontal support member 13, also in the form of a beam, via a base 13a and a 7'' plate 12.

Both ends of each support member 13 are connected to the coupling device 11 described above.
Supported by

Next, details of the support member 13 and the coupling device 11 will be explained with reference to FIGS. The portion is web 16.

The left end of the support member 13 is a bolt 17. It is fixed to the web 16 of the spherical body 14 by a nut 18, and the supporting member 1
The right end of 3 is a shaft portion 19 forming a spline shaft,
It is slidably inserted into a spline groove 20 formed in the web 16 of the spherical body 14 .

The coupling device 11 includes a pair of coupling plates 21 and 22 facing each other.
Concave spherical surfaces 23 and 24 are formed on opposing surfaces of the coupling plates 21 and 220, that is, on the lower surface of the coupling plate 21 and the upper surface of the coupling plate 22, respectively.

The concave spherical surfaces 23 and 24 have a curvature that matches the external shape of the spherical body 14 described above.

Bracket 10 at the upper end of the piston rod 9 (see Figure 1)
On top, the coupling plate 22 is connected to the bolt 25. It is fixed by a nut 26, and the spherical body 14 is placed on the concave spherical surface 24 of this coupling plate 22.

The concave spherical surface 23 of the coupling plate 21 is placed on top of the spherical body 14 so as to be in contact with it, and the coupling plates 21 and 22 are attached to the screw punch 27 and the nut 2.
B, and the spherical body 14 is rotatably and slidably held between the concave spherical surfaces 23° and 240°.

Thereby, the support member 13 can be rotated in all directions relative to the coupling device 11, and the right end of the support member 13 can also be displaced in the axial direction relative to the coupling device 11.

Note that there is also a shaft portion 1 forming a spline shaft at the left end of the support member 13.
9 may be provided and axially displaceable relative to the coupling device 11.

In the illustrated embodiment, the coupling plates 21 and 22 are vertically opposed to each other, but the coupling plates 21 and 22 may be opposed to each other in the front-rear direction or the like.

"Function" The coupling device between the piston rod and the support member in the vibration testing device according to this invention is coupled as described above.
The operation when a vibration test corresponding to running of a vehicle is performed using this vibration test device will be explained.

Vibration characteristics corresponding to the running of the vehicle are input to the vibrator 7 to cause the piston rod 9 to reciprocate in the vertical direction with respect to the hydraulic cylinder 8, and the plurality of coupling devices 11 at both ends of the support member 130
When the support member 13 attempts to tilt due to a difference in the height of the concave spherical surfaces 23.
24, the spherical body 14 rotates and follows the force, and due to the difference in the height of the coupling devices 11, the coupling devices 11 at both ends
．． If there is a change in the distance between the supporting members 13
The spherical body 14 slides and follows a shaft portion 19 forming a spline shaft formed at the end of the shaft.

The rotation of the spherical body 14 with respect to the coupling plates 21 and 22 and the sliding movement with respect to the shaft portion 19 operate smoothly as a combination of both movements, and also operate smoothly even in response to pulsating side split changes. do.

In the illustrated embodiment, since the base end of the rear vibration exciter 7 is mounted in a shaft-mounted structure, the support member 13
Even in the case where the support member 130 is displaced frequently and at a slight inclination, in addition to the rotation of the support member 130 spherical body 14 and the coupling plates 21 and 22 and the sliding movement of the spherical body 14 and the shaft portion 19, the rear vibration exciter I
This slight rotation is preferable for smoother operation of the coupling device 11.

"Effect of the invention" As described above, this invention allows the spherical body 14 and the coupling plates 21 and 22 at both ends of the support member 13 to rotate smoothly relative to each other in appropriate directions, and at least one end of the support member 13 is provided with support. A shaft portion 19 is formed in the member extension direction, and this shaft portion 19 is connected to the spherical body 1.
4, so the spherical bodies 14 at both ends,
140. Even if the distance between the centers changes, it slides smoothly on the support member 13.

Therefore, the coupling device 11 can smoothly adapt to individual vibrations at multiple locations and accompanying rolling, pitching, etc.
The durability of the vibration exciter 7 is improved, and the coupling device 11 smoothly responds to the vertical vibration of the vibrator 7, which has the effect of improving the reproducibility of actual driving inputs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of this invention, Fig. 2 is an enlarged front view with a part of the main part cut away, and Fig. 3 is the same as Fig. 2.
4 is a right side view of FIG. 2. 1... Test object, 7... Vibrator, 9...
... Piston rod, 13 ... Support member, 14 ... Spherical body, 19 ... Shaft portion, 2
0...Spline groove, 21°22...
Connecting plate, 23, 24...concave spherical surface.

Claims (1)

[Scope of utility model registration request] A spherical body is attached to both ends of a horizontal support member that supports the test object, and a shaft portion is formed in at least one end of the support member in the direction in which the support member extends, and the shaft portion is slid onto the spherical body. The spherical body is rotatably and slidably held by concave spherical surfaces provided on opposing surfaces of a pair of opposing coupling plates and matching the outer surface shape of the spherical body, and the coupling plate is subjected to vertical processing. A coupling device between a piston rod and a support member in a vibration testing device, characterized in that it is fixed to a piston rod of a vibrator.