JPH0441316Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Fields> This invention is applicable to abnormal noise inspection and speed display inspection in drive systems caused by unbalance of the propeller shaft of automobiles, engine torque fluctuations, gear meshing, etc. The present invention relates to a vehicle bench-based inspection device.

<Prior Art> As shown in FIG. 3, a conventional vehicle bench inspection device is composed of a front wheel rotating drum 1 and a rear wheel rotating drum 2. The front wheel rotating drum 1 includes a pair of left and right front drums 3a, 3b and rear drums 4a and 4b.
The rear wheel rotating drum 2 is composed of a pair of left and right drums 5a, 5b. 4a and 4b are
Front wheel T1 of the vehicle placed between the front drums 3a, 3b and the rear drums 4a, 4b (see Figure 4)
are rotationally driven by front drums 3a and 3b,
The rotation of the front wheel T1 results in driven rotation and free rotation. On the other hand, the left and right drums 5a and 5b of the rear wheel rotating drum 2 are configured to rotate together by a rotating shaft 7, and the rotating shaft 7 is directly connected to a gear box 8, and the front drum 3
Rotational power is transmitted to the rotating shafts 6 of the a and 3 b from the gear box 8 via the rotation transmission mechanism 9 and the gear box 10, so that the front drums 3 a, 3 b and the left and right drums 5 a, 5 b of the rear wheel rotation drum 2 rotate synchronously. This is the structure that will be used.

<Problems to be solved by the invention> In the conventional device described above, in normal running conditions, the front wheel T1 is connected to the front drums 3a and 3b as shown in FIG. 4A.
The front wheel T1 contacts and rotates between the rear drums 4a and 4b, but during sudden acceleration and deceleration, since the rear drums 4a and 4b are freely rotating, the front wheel T1 lifts up and separates from the rear drums 4a and 4b. Unbalanced positions Wa, Wb of the front drums 3a, 3b,
Unbalanced position Wc of rear drums 4a, 4b,
We and the left and right drums 5a of the rear wheel rotation drum 2,
The unbalanced positions Wf and Wg of 5b were in the same phase, and the directions of the inertia forces F due to this were all the same, causing the forcing force to become large and the vibration to become large.

This vehicle bench-mounted inspection device is installed on the floor surface of a room, and there is a concern that the generation of the above-mentioned vibrations may affect the building and work environment.
In particular, the front wheel rotation drum 1 has a large inertia force, and the vehicle speed
There is a risk that the forced frequency of 100 to 120 km/h matches the natural frequency of the floor system and causes resonance.

<Means for solving the problems> The present invention has been provided to improve the above-mentioned conventional problems, and its characteristic configuration is as follows:
It is composed of a front wheel rotating drum consisting of a pair of left and right front drums and four rear drums, and a left and right pair of rear wheel rotating drums, and the front wheel rotating drum and the rear wheel rotating drum are driven to rotate synchronously. In the on-vehicle inspection device, the rotational unbalance positions of all four drums of the front wheel rotation drum are made to have a phase difference of 90 degrees, and the rotation is transmitted between the front drum and the rear drum by a timing belt. , the rear wheel rotating drum has a rotational imbalance position with a phase difference of 180°.

<Function> With the above configuration, the rear drum of the front wheel rotation drum is always driven to rotate synchronously with the front drum, thereby preventing the front wheel from lifting up and separating during sudden acceleration or deceleration. Also, due to the phase difference between the unbalanced positions of each drum,
The inertial forces of each are pulled together and cancel each other out, suppressing the occurrence of vibration.

<Example> An example of the present invention will be described below based on FIGS. 1 and 2. Reference numeral 1 denotes a front wheel rotating drum, which is composed of front drums 3a, 3b and rear drums 4a, 4b, and the front drums 3a, 3b can be rotated together by a rotating shaft 6.

Reference numeral 2 denotes a drum for rotating the rear wheels, which is composed of left and right drums 5a and 5b fixed on a rotating shaft 7.

8 is a gear box to which the rotating shaft 7 is directly connected, and the rotation transmission mechanism 9 and the gear box 1
The rotation is also transmitted to the rotating shaft 6 via the rotary shaft 6.

Although the above configuration is similar to the conventional device, the present invention has the following configuration.

First, the rear drum 4a of the front wheel rotation drum 1,
4b and the rotating shafts 6 of the front drums 3a, 3b, a timing belt 11 transmits the rotation.

Next, the unbalanced positions Wa, Wb of the front drums 3a, 3b and the unbalanced positions Wc, We of the rear drums 4a, 4b are set to have a phase difference of 180°.
As a result, the unbalance position Wa~ between the front drums 3a, 3b and the rear drums 4a, 4b
We will have a phase difference of 90 degrees.

On the other hand, the left and right drums 5a of the rear wheel rotation drum 2,
This is a configuration in which the unbalanced positions Wf and Wg between 5b have a phase difference of 180°.

In FIG. 2, 12 is a vehicle, T2 is a rear wheel, and 13 and 14 are wheel protrusion prevention rollers.

Since the present invention has the above-described structure, the left and right drums 5a, 5b of the rear wheel rotating drum 2 and the front drums 3a, 3b of the front wheel rotating drum 1 are synchronized by the rotational force of the tires via the gearbox 10. While rotating, the rear drums 4a and 4b are also driven to rotate synchronously by the timing belt 11. Due to this synchronous rotational drive of the rear drums 4a, 4b, even if the rear drums 4a, 4b are suddenly accelerated or decelerated, there will be no rotational speed difference between the rear drums 4a, 4b and the front drums 3a, 3b, and the rear drums will not be caused by the lifting of the front wheel T1. 4a, 4b is prevented from separating. Elimination of this separation phenomenon of the front wheels T1 means that vibrations caused by the rocking of the vehicle 12 caused by the front wheels T1 lifting up from the rear drums 4a, 4b, descending and contacting the rear drums 4a, 4b again, are eliminated. Prevented.

In addition to this, each drum 3a, 3b, 4a, 4
Due to the phase difference between the unbalanced positions Wa to Wg of b, 5a, and 5b, the directions of the inertial forces F of the unbalanced positions Wa to Wg become directions that attract each other,
Each drum 3a, 3 acts to cancel each other's inertial force F.
It also suppresses vibration generation from b, 4a, 4b, 5a, and 5b.

<Effects of the invention> As described above, according to the invention, vibrations can be reduced by simply modifying the conventional configuration of the vehicle bench inspection equipment, and vibrations caused by vibrations from floors, buildings, and work environments can be reduced. There are advantages such as eliminating adverse effects, reducing failures in mechanical systems due to vibrations, and improving abnormal noise detection in vehicles due to noise reduction.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main components of the device of the present invention;
The figure is a side view, FIG. 3 is a perspective view of the main components of the conventional device, and FIG. 4 is a diagram illustrating problems with the conventional device. 1... Drum for front wheel rotation, 2... Drum for rear wheel rotation, 3a, 3b... Front drum, 4a, 4b...
...Rear drum, 5a, 5b...Drum, 6,7...
...Rotating shaft, 8...Gearbox, 11...Timing belt, Wa~Wg...Unbalanced position,
F...Inertial force.

Claims (1)

[Scope of utility model registration request] It is composed of a front wheel rotating drum consisting of a pair of left and right front drums and four rear drums, and a left and right pair of rear wheel rotating drums, and the front wheel rotating drum and the rear wheel rotating drum are driven to rotate synchronously. In the on-vehicle inspection device, the rotational unbalance positions of all four drums of the front wheel rotation drum are made to have a phase difference of 90 degrees, and the rotation is transmitted between the front drum and the rear drum by a timing belt. . A vehicle platform inspection device, wherein the rear wheel rotation drum has a rotational imbalance position with a phase difference of 180°.