JPH0511481Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a bearing device for a dynamic balance tester.
In particular, the present invention relates to a bearing device suitable for measuring overhung rotors.

[Prior art]

Conventionally, in a horizontal dynamic balance tester that measures an overhung type rotor 1, as shown in FIG.
Tests are being carried out with support in place. In this case, as shown in the figure, since the rotor is of an overhang type, it cannot be rotated if its own weight is applied, so a round belt 4 is applied to the upper side of the outer circumference of the rotor to drive it. Bearings are supported at two points on the inner circumference of the rotor that is driven by
There is no center of gravity between these two supporting points, and when the rotor is rotated, the rotor tends to fall over, resulting in extremely unstable measurement conditions. In addition, both shafts 2 and 3 are independently suspended from a fixed frame by springs, and as mentioned above, they are not evenly supported by bearings, so when the rotor is rotated, they swing individually.
This also caused the inability to perform stable measurements.

Therefore, a bearing frame is integrally constructed, a cylindrical bearing is attached to this frame, and the shaft of the rotor is inserted and supported within this cylindrical bearing.
In this case, when the integrated frame is suspended from a fixed frame and the rotor is rotated about the bearing position in the cylinder, it will oscillate in the same way, and since the shaft is inserted into the cylinder, the rotor will fall. This can be prevented.

[Problem that the invention attempts to solve]

However, as mentioned above, even if the bearing is cylindrical, the insertion side and the exit side of the rotor shaft are slightly tilted due to the rotor's own weight and the drive of the round belt, so the bearing position is lower on the insertion side and upper on the exit side. Therefore, it cannot be supported evenly within the cylinder. Therefore, when measuring an overhung rotor even if the bearing is simply made into a cylindrical shape,
It cannot be said that stable round belt driving conditions and stable bearing support conditions are satisfied. Further, since uneven contact occurs between the rotor shaft and the bearing portion, the life of the bearing is shortened.

This idea eliminates the drawback of not being able to perform stable measurements when performing dynamic balance tests on overhung rotors with conventional bearing devices, as described above, and enables stable drive using a round belt and stable bearing support. The purpose of the present invention is to provide a bearing device for a dynamic balance tester that can perform highly accurate unbalance measurements.

[Means for solving problems]

The bearing device of the dynamic balance tester according to this invention is
A cylindrical bearing having a through hole into which the rotor shaft of the rotor to be subjected to the dynamic balance test is inserted, a support member that supports this cylindrical bearing, and a fixed frame of the main body of the dynamic balance tester on which the support member is placed and fixed. In a bearing device for a dynamic balance testing machine which is integrally coupled with a bearing frame supported by a resilient member, a part of the cylindrical surface of the cylindrical bearing is cut out until it reaches the through hole, and The rotor shaft is characterized by being provided with a presser plate that comes into contact with a part of the rotor shaft exposed in the notch when the rotor shaft is inserted.

[Effect]

Therefore, when performing a dynamic balance test on an overhung rotor, the notch in the cylindrical bearing can hold the rotor shaft with a presser plate to the extent that rotation of the rotor shaft is not hindered. is stable, and the bearing position does not shift to one side and cause contact due to one-sided contact.

〔Example〕

FIG. 1 shows a bearing device for a dynamic balance tester that is an embodiment of this invention. Figure a is a front view when the rotor 1 is not supported, and figure b is a side view when the rotor 1 is supported.

The cylindrical bearing 5 into which the rotor shaft of the overhung rotor 1 is fitted and supports the rotor shaft has a notch 8 as shown in FIG. 2, and is fixed by the bearing support member 6. Supported. The bearing support member 6 is further placed on a boat-shaped bearing pedestal 7 and fixed by a fastening portion. In this way, the cylindrical bearing 5 is integrally attached to the bearing frame 7 via the bearing support member 6. The bearing pedestal 7 is supported by a resilient member on a fixed frame of the main body of the dynamic balance tester (not shown). Further, the bearing support member 6 is provided with a presser plate 9 that presses the rotor shaft at the notch 8 of the cylindrical bearing 5. The presser plate 9 is connected via a spring 10 to a frame slope 11 that can be moved up and down relative to the bearing support member 6 and fixed at any position. By fixing it at an appropriate position, it is possible to apply a pressing force that does not interfere with the rotation of the rotor shaft.

Since the bearing device according to this invention is constructed as described above, the rotor shaft of the overhung rotor 1 is fitted into the cylindrical bearing 5 and supported, and the rotor shaft is exposed in the notch 8 by the holding plate 9. can be pressed and supported with a pressing force that does not interfere with rotation. Therefore, during a rotor dynamic balance test, driving by the round belt 4 can be performed under stable conditions, and the rotor shaft can be evenly supported within the cylindrical bearing 5, resulting in a smooth bearing without rattling inside the cylinder. Support can be provided.

If the rotor shaft is long, use a long cylindrical bearing as shown in Figure 2, and provide a notch in the center.
The press plate may be operated so that the centers of the left and right bearing positions of the notch are aligned. If the rotor shaft is short, a notch 8' is provided at the rear side of the cylindrical bearing 5' where the rotor shaft is inserted, as shown in FIG. By doing so, stable support can be achieved.

〔effect〕

The bearing device of the dynamic balance tester according to this invention is
As mentioned above, during dynamic balance tests of overhung rotors, stable and smooth bearing support of the rotor shaft can be achieved, the rotor can be driven stably by the round belt, and unbalance measurements can be performed with high accuracy. can. Furthermore, since there is no one-sided contact in the bearing portion, the bearing life is extended.

[Brief explanation of drawings]

Fig. 1a is a front view showing the configuration of a bearing device of a dynamic balance testing machine which is an embodiment of this invention, and Fig. 1b is a side view showing the state when an overhung rotor is supported by the embodiment device. It is a diagram. Second
FIG. 3 is a side view showing an example of the shape of the cylindrical bearing in the embodiment. FIG. 4 is a diagram illustrating a state in which an overhung rotor is supported by a conventional bearing device. DESCRIPTION OF SYMBOLS 1... Overhung rotor, 5... Cylindrical bearing, 6... Bearing support member, 7... Bearing stand, 8...
...notch part, 9...pressing plate.

Claims (1)

[Scope of utility model registration request] A cylindrical bearing having a through hole into which the rotor shaft of the rotor to be subjected to the dynamic balance test is inserted, a support member that supports this cylindrical bearing, and a fixed frame of the main body of the dynamic balance tester on which the support member is placed and fixed. In a bearing device for a dynamic balance testing machine which is integrally coupled with a bearing frame supported by a resilient member, a part of the cylindrical surface of the cylindrical bearing is cut out until it reaches the through hole, and A bearing device for a dynamic balance tester, characterized in that a holding plate is provided which comes into contact with a part of the rotor shaft exposed in the notch when the rotor shaft is inserted.