JPH0364822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus suitable for use in vibration testing of tracked vehicles such as bulldozers.

[Conventional technology]

A device for performing a vibration test on a tracked vehicle such as a bulldozer is generally designed to apply an excitation force in the vertical direction to the tracks or wheels of the tracked vehicle from below using a plurality of excitation cylinders.

However, since the crawler belt is highly rigid, interference between the crawler belt and the vibrator occurs during vibration, and a large lateral force acts on the piston rod of the vibrating cylinder, resulting in damage to the vibrator. For this reason, devices are widely used in which all or part of the crawler belt beneath the wheels is removed and the wheels are directly vibrated.

In such vibration tests of tracked vehicles, which are performed with the tracks removed, the vibration characteristics of the tracked vehicle change due to the removal of the tracks, so in order to measure the vibration characteristics more accurately, the tracks were removed. A device that performs vibration tests while equipping each track wheel from which the crawler has been removed with a member that provides a tension equivalent to that of the crawler;
In order to perform vibration tests without removing the crawler track, a universal joint, spherical bearing, roller, etc. is interposed between the piston rod end of the vibrating cylinder and the crawler vibrating member to reduce the lateral force applied to the piston rod. Vibration testing devices designed to suppress this have been proposed.

[Problem that the invention seeks to solve]

However, in the above-mentioned apparatus that performs vibration tests on tracked vehicles by removing the tracks, it is not possible to install a member between the wheels from which the tracks have been removed that provides a tension equivalent to that of the removed tracks. It is extremely difficult to bring the vehicle into the same state as when the track is fully installed, and vibration tests using this device cannot accurately measure the vibration characteristics of a tracked vehicle. In addition, with the above-mentioned equipment that can perform vibration tests without removing the track, it is designed to allow for tilting of the track in the front-rear direction and left-right direction that occurs during vibration. As the vehicle attempts to move forward and backward or left and right along with the above-mentioned inclination,
In addition to allowing these movements, measures to prevent the vehicle under test from falling on the vibration test apparatus are insufficient due to these movements, and it is difficult to increase the excitation amplitude during the vibration test.

The present invention attempts to solve the above-mentioned problems by allowing the vehicle to be tested to move in the longitudinal and lateral directions within a certain range, thereby affecting the vibration characteristics of the vehicle under test. A vibration test for a tracked vehicle that makes it possible to perform a vibration test by shaking the vehicle with large amplitude, while also ensuring that the vehicle does not fall off the device during vibration. The purpose is to provide equipment.

[Means for solving problems]

Therefore, the vibration testing device for a tracked vehicle of the present invention is a vibration testing device that performs a vibration test by applying an excitation force in the vertical direction from below the tracks of a tracked vehicle using a plurality of excitation cylinders. A lower receiving member attached to the upper end of the piston rod of the swing cylinder, an upper receiving member having a flat upper surface on which the crawler track is placed, and an upper receiving member interposed between the upper receiving member and the lower receiving member. a sliding mechanism that allows relative movement of both receiving members in the longitudinal and lateral directions within predetermined ranges, and a stopper mechanism capable of restraining relative movement of both receiving members that exceeds the predetermined range; It is characterized by the provision of.

[Effect]

In the above-mentioned vibration test device for tracked vehicles of the present invention,
The tracked vehicle tracks to be measured are placed in a predetermined position on the upper support member, and the necessary vibration cylinders are driven while the vehicle vibration test is carried out with the main body unrestricted. It is done. On this occasion,
The crawler track can be moved upwardly away from the upper receiving member, suppressing restraint in the vertical direction, and furthermore, due to the action of the sliding mechanism, the movement of the vehicle in the longitudinal and lateral directions is allowed within predetermined ranges. The vibration characteristics of the excited vehicle are exhibited. Furthermore, the stopper mechanism prevents the device from falling off the vehicle.

〔Example〕

Hereinafter, a vibration testing device for a tracked vehicle as an embodiment of the present invention will be explained with reference to the drawings.
The figure is a side view schematically showing the state of use.
The figure is a front view schematically showing the state of use.
The figure is an enlarged view of the part in Fig. 2, Fig. 4 is an enlarged view of the part in Fig. 1, Fig. 5 is a front view of the main part showing an example of use in which a stopper is attached to one side of each crawler track mounted on it, and Fig. 6 is an enlarged view of the part shown in Fig. 2. The figure is a front view of the main part showing an example of use in which locking metal fittings are attached to both sides of each crawler track, Figure 7 is a schematic side view showing the displacement of the track wheel during vibration action, and Figure 8 is the application example. FIG. 9 is a schematic front view showing the inclination of the vehicle in the lateral direction during vibration; FIG. 9 is a schematic side view showing the inclination of the vehicle in the longitudinal direction during vibration; FIGS. 10 a, b, c are a left side view, a front view, and a right side view, respectively, showing an example of mounting on a vehicle during a one-sided vibration test.

As shown in Figures 1 to 4, this device consists of a plurality of vibration cylinders 1 erected on a foundation I corresponding to the wheels of the test vehicle, and a vibration table 3 attached to the upper end of the piston rod 2. , a link 4 as a stopper mechanism, a hydraulic pressure supply device E for the vibration cylinder 1, and a control device D for controlling the operation of the vibration cylinder 1.

As shown in FIGS. 3 and 4, the vibration table 3 includes a lower receiving member 7 attached to the upper end of the piston rod 2 of the vibration cylinder 1, and a flat upper surface on which the tracks of a tracked vehicle are placed. Upper receiving member 5
and a sliding mechanism S interposed between both receiving members 5 and 7.

The sliding mechanism S includes a housing 6, a plurality of roller bearings 12 and 13 interposed between the housing 6 and the lower receiving member 7, and a plurality of roller bearings 12 and 13 interposed between the housing 6 and the upper receiving member 5. Roller bearing 9,1
It consists of 0.

The roller bearings 12 and 13 are both slidable in the left-right direction (the left-right direction of the tracked vehicle C on which it is mounted), and the roller bearing 12 is slidable in the left-right direction of the tracked vehicle C on which it is placed.
The roller bearing 13 is interposed so that when a force is exerted on the lower support member 7 and the housing 6 to separate them from each other in the vertical direction, the force is transmitted between the lower support member 7 and the housing 6. The lower receiving member 7 and the housing 6 are interposed so that when a force is exerted on the member 7 and the housing 6 to move them closer to each other in the vertical direction, the force is transmitted between the lower receiving member 7 and the housing 6.

The roller bearings 9 and 10 are both slidable in the longitudinal direction (the longitudinal direction of the tracked vehicle C on which it is mounted), and the roller bearing 9 is configured so that the upper receiving member 5 and the housing 6 are separated from each other in the vertical direction. The upper receiving member 5 and the housing 6 are interposed so that when a force is applied, the force is transmitted between the upper receiving member 5 and the housing 6,
The roller bearing 10 is interposed so that when a force is applied that causes the upper receiving member 5 and the housing 6 to approach each other in the vertical direction, the force is transmitted between the upper receiving member 5 and the housing 6. ing.

In addition, each roller bearing 9, 10, 12, 13 is
A plurality of cylindrical rollers (not shown) are arranged in parallel and are configured to contact and support the receiving members 5, 7 and the housing 6 at a plurality of linear contact portions.

Further, a presser block 11 is fixed to the lower receiving member 7 by bolts 15 so that each of its four ends protrudes upward, forming a concave portion, and the upper end of the presser block 11 in the front-rear direction is It further protrudes into the recess. The housing 6 is
The housing 6 is disposed so as to be partially inserted into the recess of the lower receiving member 7, and a protrusion is formed at the lower end of the housing 6 corresponding to the upper end of the lower receiving member 7. A roller bearing 12 is interposed between the presser block 11 and the upper end protrusion.

Further, the presser block 11 of the lower receiving member 7 in the left-right direction and the side portion of the housing 6 in the left-right direction are spaced apart by a predetermined distance, and within the range of the predetermined distance, the lower receiving member 7 and Housing 6
Reciprocal movement in the left and right direction is allowed.

The upper receiving member 5 has a concave portion formed by fixing a presser block 8 with bolts 14 so that each of its four ends protrudes downward, and the lower end of the presser block 8 in the left and right direction extends further into the recess. It is protruding towards the direction. The housing 6 is disposed such that a portion thereof is inserted into the recess of the upper receiving member 5, and a protrusion is formed at the upper end of the housing 6 corresponding to the lower end of the upper receiving member 5. A roller bearing 9 is interposed between the protrusion and the protrusion at the lower end of the presser block 8.

Pressing block 8 in the front and back direction with the upper receiving member 5
A predetermined distance is provided between the housing 6 and the longitudinal side portions of the housing 6, and mutual movement of the upper receiving member 5 and the housing 6 in the longitudinal direction is allowed within the predetermined distance. There is.

Guides 16 are mounted on both sides of the upper receiving member 5 in the left and right direction, with parts of the guides 16 protruding from the upper surface of the upper receiving member 5, and the upwardly protruding parts connect to the end connectors Fa, An elongated hole 16a is provided in the attachment portion of the guide 16 to the upper receiving member 5 so that the guide 16 can be positioned between Fb and 5.
is attached with bolts etc. through the same elongated hole.

The crawler track B is placed between the guides 16, 16 with an appropriate interval between them, and is sandwiched between the tracked vehicle C and the upper receiver by the movement of the tracked vehicle C in the left-right direction on the upper receiver member 5. Misalignment with the member 5 is prevented, and misalignment due to movement of the tracked vehicle C in the longitudinal direction is prevented by the contact engagement between the end connectors Fa, Fb and the guide 16.

Further, in the vibration cylinder located at the rearmost portion, an upper receiving member 5 is connected to the foundation via a link 4 serving as a stopper mechanism. This link 4 is provided with a predetermined amount of play so that it operates when the movement of the upper receiving member 5 exceeds a predetermined range.

The vibration testing device for a tracked vehicle as an embodiment of the present invention is constructed as described above, and operates as follows.

In other words, when any one of the plurality of vibration cylinders 1 is actuated, when the roller A above the vibration cylinder 1 is pushed upward by the cylinder 1, the roller A is shown in FIG. As shown, the suspension mechanism (not shown) rotates and displaces it around its rotation center O while horizontally moving by ΔA. In addition, the wheels A and A before and after the wheel A that is pushed up at this time are also drawn toward the side of the wheel A that has been pushed up as the crawler belt B deforms.

In this way, during vibration, the rolling wheels A shift in the front-rear direction, but the width of the upper support member 5 in the front-rear direction is set to the minimum necessary size in consideration of the amount of shift. During vibration, the wheels are prevented from coming off on the upper receiving member 5, which serves as an excitation surface, and the area immediately below the wheels A is always vibrated. Moreover, since the upper surface of the upper receiving member 5 is flat, the rolling wheels A are always reliably vibrated in the vertical up-down direction.
It has become possible to conduct vibration tests with reproducibility. In addition, since the tracks are only placed on the upper receiving member 5 and the main body of the tracked vehicle C is not restrained, the tracks B can be separated from the upper receiving member 5, and each part of the tracked vehicle C is free. It is possible to exhibit vibration characteristics and perform vibration tests with good accuracy.

Due to the free movement of the tracked vehicle C excited in this way, movements in the left-right and front-back directions also occur between the tracked vehicle C and the vibration cylinder 1, but these movements are caused by the sliding mechanism. The action of S is allowed within a predetermined range, and no lateral force acts on the piston rod 2 within the predetermined range.

During the rolling vibration test using this device, as shown in Fig. 9, the tracked vehicle C rotates around the end M of one track B, and the tracked vehicle C at this time rotates around the end M of one track B. Since the inertia force GR acts due to the lateral movement of the center of gravity G, the excitation table 3 of the crawler track B on the opposite side
The contact point N with the contact point N shifts laterally by ΔB from the initial state. Furthermore, as shown in FIG. 10, during the pitching vibration test, the inertia force GP generated by the movement of the center of gravity G acts on the tracked vehicle C, and the tracked vehicle C attempts to move in the direction of the inertia force GP.

The sliding mechanism S also acts on these forces acting in the horizontal direction, allowing the vehicle to move freely within a predetermined range.

Furthermore, when the movement of the tracked vehicle C exceeds a predetermined range, the link 4 acts to restrain the movement of the tracked vehicle C via the upper support member 5 while preventing deformation of the piston rod 2 and damage to the sliding mechanism S. At the same time, the guide 16 also prevents the tracked vehicle C from falling off from above the vibration cylinder 1.

When performing a vibration test while restraining the left and right movement of the tracked vehicle C using this device, as shown in Figure 5,
A stopper 17 is installed between the housing 6 and the lower receiving member 7 on one side of each of the left and right sliding mechanisms S to secure both 6 and 7 and prevent the tracked vehicle C from moving in the left and right direction. Good too.

Furthermore, in order to similarly restrain the tracked vehicle C in the left and right direction, locking fittings 18 are installed on both sides between the housing 6 and the lower receiving member 7 of each sliding mechanism S, as shown in FIG. The fixing between the housing 6 and the lower receiving member 7 may be further strengthened.

In addition, when exciting only one side of the track B in this device, the track B on the side that is not being excited is placed on the foundation directly or via the spacer 23, and the tracked vehicle C due to the displacement of the track B is placed on the foundation. Track guards 21 and 22 may be installed to prevent the tracks from falling off. At this time, the crawler belt guards 21 and 22 are arranged so as to be spaced from the crawler belt B by a predetermined distance in order to allow the crawler belt B to move within a predetermined range.

Furthermore, in this embodiment, the rearmost vibration cylinder 1
Although a link 4 as a stopper mechanism is attached only to the upper receiving member 5 of C can be prevented from falling off.

In this way, since the main body of the tracked vehicle C is not restrained, it is allowed to move freely in the longitudinal, horizontal, and vertical directions within a predetermined range, while affecting the vibration characteristics of the tracked vehicle C. It is possible to conduct an excitation test on the tracked vehicle C without giving any It is also possible to sufficiently detect the vibration characteristics of the vehicle. Furthermore, there is also the advantage that the test can be carried out safely because the falling of the tracked vehicle C from the device due to the movement of the tracked vehicle C during large amplitude vibrations is reliably prevented.

〔Effect of the invention〕

As described in detail above, the tracked vehicle vibration testing device of the present invention has a simple configuration, but is capable of testing vibrations of a tracked vehicle within a predetermined range without restricting its motion. Vibration tests can be performed without damaging the vibration characteristics of the vehicle, and
By setting the above predetermined range, it is possible to increase the excitation amplitude, and it is also possible to increase the minute amplitude, and even in the excitation test with a minute amplitude, the vehicle is sufficiently It is possible to detect the vibration characteristics of

Furthermore, there is the advantage that the vehicle can be reliably prevented from falling off the vibration device during large-amplitude vibration, allowing for safe testing.

[Brief explanation of drawings]

Figures 1 to 10 show a vibration testing device for a tracked vehicle as an embodiment of the present invention. Figure 1 is a side view schematically showing its usage, and Figure 2 shows its usage. A schematic front view, Figure 3 is the second
Figure 4 is an enlarged view of the part in Figure 1, Figure 5 is a front view of the main part showing an example of use in which a stopper is attached to one side of each crawler track mounted on top, Figure 6 is a front view of each crawler track. Fig. 7 is a schematic side view showing the displacement of the wheel during vibration action, and Fig. 8 is a schematic side view showing the displacement of the wheel during vibration action. FIG. 9 is a schematic front view showing the lateral inclination of the vehicle; FIG. 9 is a schematic side view showing the longitudinal inclination of the vehicle during the vibration action; FIG.
Figures a, b, and c are a left side view, a front view, and a right side view, respectively, showing an example of vehicle placement during a one-sided vibration test. 1... Vibration cylinder, 2... Piston rod,
3... Vibration table, 4... Link, 5... Upper receiving member, 6... Housing, 7... Lower receiving member, 8... Presser block, 9a, 9b... Guide bearing, 10... Bearing, 11...presser block, 1
2...Bearing, 12a...Elongated hole, 13a, 13b...
Guide bearing, 14, 15... Bolt, 16... Guide, 17... Stopper, 18, 19... Lock fitting, 20... Wheel stopper, 21, 22... Track guard, 23... Spacer, A... Rolling wheels, B... Tracks, C... Track vehicle, D... Control device, E... Hydraulic supply device, Fa, Fb... End connector, G...
...Vehicle center of gravity, I...Foundation, M...End, N...Contact point, S...Sliding mechanism.

Claims (1)

[Claims] 1. In a vibration test device that performs a vibration test by applying an excitation force in the vertical direction from below the track of a tracked vehicle using a plurality of excitation cylinders, a lower receiving member attached to the upper end of the piston rod of the excitation cylinder; An upper receiving member having a flat upper surface on which the crawler track is placed, and an upper receiving member interposed between the upper receiving member and the lower receiving member so that the relative longitudinal and lateral directions of the members of both receivers can be adjusted. A tracked vehicle, characterized in that it is provided with a sliding mechanism capable of allowing movement within a predetermined range, and a stopper mechanism capable of restraining relative movement of both of the receiving members beyond the predetermined range. vibration test equipment.