JP2955770B2 - Spindle support device for dynamic balance machine - Google Patents

Description

The present invention relates to a spindle support device for a dynamic balance machine, and more particularly, to a spindle support device for a dynamic balance machine with improved measurement accuracy.

[Conventional technology]

As shown in FIG. 3, a conventional dynamic balance machine uses a transport line 1 (transfer conveyor) for measuring tires.
A centering device 2 for centering the measurement tire, a vertically movable upper rim 3a for holding the upper and lower surfaces of the measurement tire behind the centering device 2, and a lower portion supported by a rotating shaft 4 driven to rotate. Rim 3b is arranged,
The rotating shaft 4 is connected to a driving device 5 via a transmission mechanism 6.

A main shaft 7 for supporting the rotary shaft 4 is supported via a wire 8 as shown in FIG. 4, and a bending type of a bending type is provided on a side surface thereof via a supporting member 9 such as a leaf spring and a pin 10. The load cell 11 is attached.

With such a structure, the main spindle is rotated and the main spindle 7 is rotated.
Is a device that measures the shake of the part and converts it into the amount of unbalance on both sides of the tire.

By the way, the measurement frequency of the spindle of the dynamic balance machine is 1/3 or less of the resonance frequency due to the problem of measurement accuracy,
Alternatively, it is desirable to measure in an area three times or more.

That is, since the resonance waveform of the main shaft overlaps the measurement waveform,
The N ratio deteriorates, and high-precision measurement cannot be performed. Therefore, it is desirable to perform measurement in the above-described range in terms of measurement accuracy.

[Problems to be solved by the invention]

However, since a bending type load cell 11 having a low spring constant is used for the main shaft 7 of the conventional dynamic balance machine in the load cell, the resonance frequency of the main shaft becomes low, and the main shaft 7 is shaken. For the measurement, it is preferable to apply a constant load (preload) to a load cell. However, in the conventional case, the load is not applied at all, and the load cell 11 is twisted as shown in FIG. Since a force is applied, the bending type load cell 11 is supported via a supporting member 9 such as a leaf spring and a pin 10 as shown in FIG. 6, but the inclination α of the main shaft 7 increases due to a low spring constant. , Torsional force is applied,
So-called crosstalk occurred, and high-precision measurement could not be performed.

[Object of the invention]

The present invention has been devised in view of such a conventional problem. By supporting opposing positions of a main shaft with a compression / tensile load cell having a link mechanism, a force in a direction other than a designated direction is supported. Unaffected, this is because the outputs of the upper and lower load cells at the top and bottom of the spindle are subtracted, and the forces at the top and bottom of the spindle shake are obtained, so the forces in the vertical and spindle rotation directions are canceled. is there. It is another object of the present invention to provide a spindle support device for a dynamic balance machine in which the inclination of the spindle when obtaining the same output is reduced to significantly improve the measurement accuracy.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a main shaft support device for a device for measuring a dynamic balance of a tire, wherein a link mechanism is provided in at least two vertical positions at opposing positions on the outer peripheral surface of the main shaft. The gist of the present invention is that it is configured to be supported by a compression and tension type load cell.

[Function of the invention]

The present invention is configured as described above, and the main shaft is supported by a compression / tensile type load cell, so that the load cell has:
A fixed load (preload) can be applied in advance (in this case, the main shaft is pulled by the left and right load cells). Also, since the load cell and the main shaft are connected and supported via a link mechanism, twisting of the main shaft, The inclination becomes small, and the measurement accuracy can be improved.

(Example of the invention)

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

The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a perspective view of a spindle support device embodying the present invention, FIG. 2 is a schematic view of the spindle support device, 7 is a spindle that rotatably supports a rotating shaft, and an outer peripheral surface of the spindle 7. At two opposite positions, compression and tension type load cells 13a and 13b having link mechanisms 12a and 12b are attached.

The link mechanisms 12a and 12b are provided between brackets 14a and 14b fixed to the outer peripheral surface of the main shaft 7 and brackets 16a and 16b fixed to the compression and tension type load cells 13a and 13b.
The arms 18a and 18b are connected via pins 17a and 17b so as to be able to swing up and down.

Therefore, when measuring the dynamic balance of the tire,
Even if the main shaft 7 swings in the left-right direction as shown in FIG. 2, the swing amount is absorbed through the link mechanisms 12a and 12b, so that the load cells 13a and 13b are not twisted and the hard balancer It constitutes.

With the above configuration, the load cells 13a and 13b have
A predetermined load (preload) can be applied in advance, and the main shaft 7 of the load cells 13a and 13b is connected to the link mechanism 1
Since the main shaft 7 is connected and supported via 2a and 12b, the torsion and inclination of the main shaft 7 are reduced, and the measurement accuracy can be improved.

〔The invention's effect〕

According to the present invention, in the main shaft support device of the device for measuring the dynamic balance of the tire as described above, at least two vertical positions are provided at opposing positions on the outer peripheral surface of the main shaft.
Since it is configured to support more than a part by a compression and tension type load cell equipped with a link mechanism, it is possible to cancel forces in directions other than the specified direction, raise the resonance frequency of the main shaft,
In addition, since the inclination of the main shaft when obtaining the same output can be reduced, there is an effect that the measurement accuracy can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spindle support device embodying the present invention,
2 is a schematic view of a spindle support device, FIG. 3 is a front view of a conventional tire dynamic balance machine, FIG. 4 is a perspective view of a conventional spindle support device, and FIGS. It is explanatory drawing which shows the torsion state of the load cell accompanying operation | movement of a main shaft. 4 ... rotating shaft, 7 ... spindle, 12a, 12b ... link mechanism, 1
3a, 13b ... Compression and tension type load cells.

Claims (1)

(57) [Claims] 1. A spindle support device for a tire dynamic balance measuring device, comprising: a compression / tension type having a link mechanism at least at two or more vertical positions at opposing positions on the outer peripheral surface of the spindle. A main shaft support device for a dynamic balance machine, which is configured to be supported by a load cell.