JPH06213771A - Radial loader for measuring vibration/sound of rolling bearing - Google Patents

Abstract

PURPOSE:To eliminate adverse effect of the rigidity of a loader on the natural frequency of a rolling bearing and to prevent the loader from causing temporal fluctuation in the measurement of vibration/sound. CONSTITUTION:The radial loader for measuring vibration/ sound of a rolling bearing imposes radial load to a rolling bearing 1 fixed to a rotary shaft 2 when vibration/sound of the inner ring 1a thereof is measured during rotation thereof. A lever 7 has an arm 7a fixed, at one end thereof, with a weight 6 and a low rigidity elastic (rubber) finger (protrusion) 9 at the other end thereof wherein the finger 9 presses, at the tip thereof, the outer ring 1b of the bearing 1 vertically thus imposing radial load thereto. Since a rubber finger 9 having low rigidity is employed, rigidity of the loader has substantially no effect on the natural frequency of the bearing 1. Furthermore, since load is applied to the lever 7, the outer ring 1b is restricted stably and temporal fluctuation in the measurement of vibration/sound due to the loader is substantially eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying a radial load to a rolling bearing in measuring vibration and sound generated when the inner ring of the rolling bearing rotates.

[0002]

2. Description of the Related Art Vibration and acoustic measurement of rolling bearings is important as a means to obtain basic data for research and theoretical analysis of rolling bearings. Above all, the radial load in this measurement is directly measured. Since it affects the measurement accuracy, it can monitor the radial load applied during measurement.
Researchers have put a lot of effort into checking fluctuations.

A radial load device for vibration / acoustic measurement of a rolling bearing has conventionally used a belt and a spring, and a belt 3 is applied to the outer ring 1b of the rolling bearing 1 to be measured as shown in FIG. A method has been adopted in which the spring 4 attached to one place of 3 is given a predetermined extension to generate a spring force in the radial direction, that is, a radial load, and the radial load F is applied to the rolling bearing 1. However,
As described above, in the method of transmitting the radial load F to the outer ring 1b of the rolling bearing 1 by the belt 3, the tension of the belt 3 greatly affects the natural frequency of the rolling bearing 1,
Since the restraint of the outer ring 1b by the belt 3 is unstable, vibration /
There is a problem that the measured value of the sound changes drastically with the passage of time, which makes it impossible to measure the vibration and sound accurately. An object of the present invention is to solve these conventional problems so that the rigidity of the load device does not affect the natural frequency of the rolling bearing, and the load device does not induce temporal fluctuations of vibration / acoustic measurement values. Is what you are trying to do.

[0004]

[Means for Solving the Problems] When measuring the vibration and sound of an inner ring of a rolling bearing mounted on a rotating shaft,
In a radial load device for vibration / acoustic measurement of a rolling bearing for applying a radial load to the bearing, according to the present invention, a lever (lever), a weight attached to one end of the lever arm, and the lever arm are provided. Attached to the other end of
The tip is configured to press the outer ring of the bearing vertically, and the projection having low rigidity and elasticity for applying the radial load constitutes the loading device.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on the embodiment shown in FIG. In FIG. 1, parts corresponding to those in FIG. 2 are designated by the same reference numerals. In FIG. 1, 1 is a rolling bearing for vibration or acoustic measurement, 1a is its inner ring, 1b is an outer ring, 1c is a ball, 6 is a weight, 7 is a lever, and 7a is for transmitting the force generated by the weight 6. The lever arm, 7b is a lever fulcrum, and 8 is a connecting rod for connecting to the lever arm 7a of the weight 6. Reference numeral 9 is a finger (also referred to as a protrusion) made of an elastic material (for example, rubber) having low rigidity.

Now, the lever principle is established by the distance between the attachment point of the connecting rod 8 and the lever fulcrum 7b on the lever arm 7a and the distance between the attachment point of the finger 9 on the lever 7a and the lever fulcrum 7b. The "downward force" in the drawing caused by the weight 6 appears as "upward force" in the drawing at the position of the finger 9 according to the principle of leverage. In the embodiment, the distance between the both attachment points and the fulcrum 7b is 1: 1.

All of the plurality of fingers 9 are arranged equidistantly from the fulcrum 7b of the lever, that is, in a direction perpendicular to the plane of the drawing, and their upper ends are arranged so as to press the outer ring 1b in the vertical direction. Thus, the force generated by the principle of leverage and the lever is applied to the rolling bearing 1 to be measured through one to several fingers 9.
Is applied to the outer ring 1b as a radial load. here,
The low rigidity of the finger 9 is appropriately 10% or less of the radial rigidity of the rolling bearing 1 to be measured alone.

In addition, a YZ mechanical stand is actually added to the lever 7b so that the lever 7b can be moved up and down, and the lever 7a is horizontally adjusted to finely adjust the radial load on the weight 6. It's easy to do. In addition, the rotating shaft 2 and the inner ring 1a are connected to, for example, the nut 1
By sticking with 0 or the like, it is possible to suppress the sliding movement of the measured bearing 1 in the axial direction and stabilize the rotation, and further reduce the time change of the measured values of vibration and sound.

[0009]

As described above, according to the device of the present invention, since the finger 9 made of rubber or the like having a low rigidity is used, the rigidity of the load device hardly affects the natural frequency of the rolling bearing. Since the load is applied by the lever, the restraint on the outer ring 1b is stable, and there is almost no temporal change in the measured values of vibration and sound due to the load device.

Therefore, the vibration / acoustic measurement accuracy can be greatly improved as compared with the conventional case. Furthermore, there is an effect that no skill is required for setting the load device for the bearing to be measured.

[Brief description of drawings]

FIG. 1 is a principle view showing an embodiment of the present invention, in which A is a front view and B is a sectional view taken along the line CC ′ of A.

FIG. 2 is a principle configuration diagram of a conventional radial load device for vibration / acoustic measurement of a rolling bearing.

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[Procedure amendment]

[Submission date] October 15, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Vibration and acoustic measurement of rolling bearings is important as a means to obtain basic data for research and theoretical analysis of rolling bearings. Above all, the degree of radial load applied in this measurement is direct. Since it affects the measurement accuracy, it can monitor the radial load applied during measurement.
Researchers have put a lot of effort into checking fluctuations.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

From the above , the vibration / acoustic measurement accuracy can be greatly improved as compared with the prior art. Furthermore, there is an effect that no skill is required for setting the load device for the bearing to be measured.

Claims (1)

[Claims] 1. A radial load device for measuring vibration and sound of a rolling bearing for applying a radial load to the bearing when measuring vibration and sound when an inner ring of a rolling bearing mounted on a rotating shaft rotates. A lever (lever), a weight attached to one end of the lever arm, and a lower rigidity attached to the other end of the lever arm, the tip of which vertically presses the outer ring of the bearing to apply the radial load. A radial load device for vibration / acoustic measurement of rolling bearings, characterized by comprising elastic protrusions.