JP2005069288A - Inspection method for grease filling inside rolling bearings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method for easily inspecting an encapsulated state of grease encapsulated in a rolling bearing.
SOLUTION: Grease is sealed under a predetermined condition in a dummy workpiece having the same shape and size as a rolling bearing to be inspected for grease sealing, and the sealing state of the grease sealed inside is observed. Since the outer ring 2 of the dummy workpiece is made of a transparent acrylic material, it is possible to easily and clearly observe how much grease is attached to the raceway surface 2c of the outer ring 2 from the outer peripheral surface 2a. .
[Selection] Figure 1

Description

  The present invention relates to an inspection method for inspecting a sealed state of grease sealed in a rolling bearing.

  In the manufacturing process of a rolling bearing, inspection and management of the sealing state of grease sealed in the inside of the rolling bearing are performed. In general, the form of the grease mass enclosed in the rolling bearing is visually observed, and when the rolling bearing is very small, it is observed using a microscope. If necessary, a comparison is made with a sample photograph in the case where the state of sealing of the grease is good and bad.

Further, Patent Document 1 discloses a grease application device including a grease application machine, a grease application controller, an electronic balance, a balance controller, a computer, a driving device, and the like. If this grease application device is used, a rolling bearing is disclosed. It is possible to inspect and manage the sealing state of the grease sealed in the inside of the housing. In other words, this grease applicator measures the mass of the rolling bearing before and after the grease is filled, and determines whether the amount of grease is excessive, appropriate, or insufficient by a computer. It has become.
Utility Model Registration No. 25661620

In recent years, rolling bearings are increasingly required to have low torque, long life, and improved rotational accuracy. In connection with this, it is necessary to manage the form of the grease enclosed in the rolling bearing, as well as the amount of sealing, as well as in which form in the rolling bearing.
However, the grease application apparatus described in Patent Document 1 can inspect and manage only the mass of grease enclosed in the inside of the rolling bearing. If the above-mentioned method for visually observing the form of the grease lump is used in combination, it is possible to inspect and manage the form of the grease lump to some extent, but the grease adheres to what part of the raceway surface of the rolling bearing. It was difficult to determine if it was. In particular, when the rolling bearing is very small, the determination is difficult even if a microscope is used.
Therefore, the present invention solves the problems of the prior art as described above, and grease is attached to the inside of the rolling bearing, particularly to what part of the raceway surface of the rolling bearing. It is an object of the present invention to provide an inspection method for easily inspecting whether or not there is any problem.

  In order to solve the above problems, the present invention has the following configuration. That is, the grease sealing state inspection method inside the rolling bearing according to the present invention is a method of performing inspection of the sealing state of the grease sealed inside the rolling bearing using a dummy work having the same shape and the same dimensions as the rolling bearing. And an inner ring, an outer ring, and a plurality of rolling elements that are rotatably arranged between the inner ring and the outer ring, and at least one of the inner ring and the outer ring is made of a transparent body. Further, grease is sealed in the dummy workpiece under a predetermined condition, and the sealed state of the grease sealed in the dummy workpiece is observed.

The shape and dimensions of the dummy workpiece are the same as those of a rolling bearing whose grease is to be inspected. When grease is sealed under the same conditions, the grease enclosed in the dummy workpiece is the same as that inside the rolling bearing. This is the same as the state of the sealed grease. Therefore, by observing the sealed state of the grease inside the dummy workpiece, the sealed state of the grease inside the rolling bearing can be inspected.
And since at least one of an inner ring | wheel and an outer ring | wheel is comprised with the transparent body, it is possible to observe easily the enclosure state of the grease enclosed inside the dummy workpiece from the outside of the dummy workpiece.

  As described above, according to the method for inspecting the state of grease inside the rolling bearing according to the present invention, the grease is enclosed in the inside of the rolling bearing, in particular, how much grease is attached to the raceway surface of the rolling bearing. Can be easily inspected.

An embodiment of a method for inspecting a state of grease inside a rolling bearing according to the present invention will be described in detail with reference to the drawings.
[Example 1]
First, a dummy workpiece having the same shape and dimensions as a rolling bearing to be inspected for grease filling is prepared. FIG. 1 is a cross-sectional view for explaining the structure of a dummy workpiece. An inner ring 1, an outer ring 2, a plurality of rolling elements (balls) 3 disposed between the inner ring 1 and the outer ring 2, and inner rings And a retainer 4 that holds the rolling elements 3 between the outer ring 2 and the outer ring 2.

  The outer ring 2 is manufactured by cutting a transparent acrylic material, and has the same shape and the same dimensions as the outer ring of a rolling bearing to be inspected for grease sealing. In order to improve transparency, the outer peripheral surface (outer cylindrical surface) 2a, the inner peripheral surface (inner cylindrical surface) 2b, and the raceway surface 2c are subjected to processing such as grinding, superfinishing, and polishing. For the inner ring 1, the rolling element 3 and the cage 4 of the dummy work, the rolling bearing parts (mass production product) whose grease is to be inspected are used as they are.

  Grease is sealed inside the dummy workpiece under predetermined conditions, and the state of the grease is visually observed. Since the outer ring 2 is made of a transparent body, it is possible to easily and clearly observe how much grease is attached to the raceway surface 2c of the outer ring 2 from the outside of the outer peripheral surface 2a. Then, by comparing with a sample dummy work that is separately manufactured and determined to have good or bad grease filling condition, the good or bad grease filling condition is judged. FIG. 2 is a view of the dummy workpiece in which grease is sealed as viewed from the outside of the outer peripheral surface 2a of the outer ring 2, and it can be seen that the grease 5 is attached to the raceway surface 2c and the grease sealing state is good.

Sample dummy workpieces with good or bad grease filling conditions are those with good or bad grease filling conditions during the manufacture of normal rolling bearings (for example, the direction of the discharge hole of the grease discharge nozzle of the grease filling machine, grease It can be obtained by enclosing the grease with the distance between the application surface and the tip of the grease discharge nozzle, the hardness of the grease, and the like.
Means for determining that the grease filling state is good or bad at the time of manufacturing a normal rolling bearing is a vibration inspection, an acoustic inspection, a rotational torque measurement, an endurance test, and the like performed after assembly of the rolling bearing.

  The shape and dimensions of this dummy workpiece are the same as that of a rolling bearing whose grease is to be inspected. When grease is sealed under the same conditions, the grease enclosed in the dummy workpiece is in a rolling bearing. It is the same as the sealed state of grease sealed inside. Therefore, by observing the sealed state of the grease inside the dummy workpiece, the sealed state of the grease inside the rolling bearing can be inspected.

When rolling bearings are produced, by periodically observing the grease filling state inside the dummy workpiece, the grease filling state inside the produced rolling bearing can be managed accurately, and the quality of the rolling bearing can be stabilized. Is planned.
In this embodiment, the outer ring 2 is made of a transparent body. However, when it is desired to inspect the grease sealing state of the raceway surface of the inner ring 1, the inner ring 1 may be made of a transparent body. Further, if both the inner ring 1 and the outer ring 2 are made of a transparent body, the grease-enclosed state of the raceway surface 2c of the outer ring 2 and the raceway surface of the inner ring 1 can be inspected.

  Furthermore, in the present embodiment, the outer ring 2 is made of a transparent acrylic material, but may be made of other types of resin materials such as polycarbonate, glass, or the like as long as it is a transparent body. However, those with good workability are desirable. Moreover, in order to melt | dissolve and wash out the enclosed grease with a solvent and to reuse the dummy workpiece, a grease that is not attacked by a solvent such as hexane or petroleum benzine is preferable.

  Further, it is desirable that the outer peripheral surface 2a, the inner peripheral surface 2b, and the raceway surface 2c have high transparency. However, even if the outer surface 2a, the inner surface 2b and the raceway surface 2c are somewhat opaque in the dry state, the transparency improves when the grease adheres. It is not necessary to perform the process. However, in this case, the grease adhering to the inner peripheral surface 2b or the raceway surface 2c can be observed, but the grease adhering to the rolling element 3 or the cage 4 cannot be observed from the outer side of the outer peripheral surface 2a. . In order to clearly observe the grease adhering to the rolling element 3 or the cage 4 from the outside of the outer peripheral surface 2a, the outer peripheral surface 2a, the inner peripheral surface 2b, and the raceway surface 2c need to be highly transparent.

Furthermore, in the present embodiment, the outer ring was manufactured by cutting the transparent acrylic material, but the processing method is not limited to cutting, and other methods such as injection molding and press molding may be used.
Furthermore, in the present embodiment, a deep groove ball bearing has been described as an example of a rolling bearing, but the present invention can be applied to various types of rolling bearings. For example, radial ball bearings such as angular contact ball bearings, double row angular contact ball bearings, self-aligning ball bearings, cylindrical roller bearings, tapered roller bearings, needle roller bearings, self-aligning roller bearings, thrust ball bearings, thrust It is a thrust type rolling bearing such as a roller bearing.

Below, the modification (Examples 2-8) of Example 1 is demonstrated. In addition, since the grease sealing state inspection method inside the rolling bearings of Examples 2 to 8 is substantially the same as that of Example 1, only different parts will be described and description of similar parts will be omitted.
[Example 2]
In Example 1, the grease sealing state was visually observed, but may be observed using an optical device such as a microscope.

Example 3
In Example 1, the grease-enclosed state inside the dummy workpiece was visually observed and compared with a sample dummy workpiece in which the grease-enclosed state was determined to be good or bad, thereby determining whether the grease-enclosed state was good or bad. The determination may be made by comparing the grease-filled image obtained by taking a photograph of the grease-filled state inside the dummy work with the sample dummy work.

Example 4
Whether the grease is sealed or not is determined by how much grease is attached to the raceway surface. To facilitate this determination, the outer circumference of the outer ring 2 made of a transparent body is determined. A line 7 parallel to the circumferential direction may be provided on the surface 2a and used as a criterion for determination (see FIG. 3). Then, it can be easily determined how much grease has entered the raceway surface portion.
The position where the line 7 is provided may be determined based on the grease sealing states of a plurality of rolling bearings that are determined to have good or poor grease sealing conditions. In the case where the inner ring 1 is made of a transparent body, a similar criterion line may be provided on the inner peripheral surface of the inner ring 1.

Example 5
In Example 1, it is visually observed how much grease is attached to the raceway surface, but it can also be quantitatively measured using a microscope having a dimension measuring function.
Example 6
In Example 1, the grease filling state is visually observed to determine whether the grease is good or bad. However, the grease filling state is photographed with an electronic camera or the like, and the image is processed to determine whether the grease is good or bad. It can also be done.

Example 7
Examples 1 to 6 are examples in which the grease filling state is inspected, but if a dummy workpiece is used, the behavior of the grease during rotation of the bearing can be observed. That is, if the dummy workpiece is rotated under the same conditions as the conditions in which the rolling bearing is used, and the behavior of the rotating grease is observed with a high-speed camera or the like, the behavior of the rotating rolling bearing grease can be known. Moreover, the state of the grease after rotation can also be observed.
Thereby, data for determining an appropriate amount of grease, an enclosure location, and an enclosure form can be obtained. In addition, data for determining the bearing internal design such as the cage and shield can be obtained.
In this embodiment, the bearing housing may be made of a transparent body if necessary. Further, the outer ring or inner ring of the dummy workpiece may be made of a transparent material having heat resistance (for example, heat resistant glass) if necessary.

Example 8
The rolling bearing may perform “break-in rotation” in its manufacturing process, but if a dummy workpiece is used as in the seventh embodiment, the state of grease after break-in rotation can be observed. That is, by performing a break-in rotation under various conditions using a dummy workpiece and observing the state of the grease after the break-in rotation, it is possible to determine an appropriate break-in rotation condition (rotation speed, rotation time, etc.).

It is a longitudinal cross-sectional view which shows the structure of the dummy workpiece | work used in the grease enclosure state inspection method inside the rolling bearing which concerns on this invention. It is the figure which looked at the dummy workpiece | work with which grease was enclosed from the outer peripheral surface of the outer ring | wheel. It is a conceptual diagram of the dummy work which provided the line for criteria.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 2a Outer peripheral surface 2b Inner peripheral surface 2c Track surface 3 Rolling element

Claims (1)

A method for inspecting the sealed state of grease enclosed in a rolling bearing using a dummy workpiece having the same shape and the same dimensions as the rolling bearing,
The dummy work comprising: an inner ring; an outer ring; and a plurality of rolling elements that are rotatably arranged between the inner ring and the outer ring, and at least one of the inner ring and the outer ring is made of a transparent body. A method for inspecting a grease sealing state inside a rolling bearing, wherein grease is sealed under predetermined conditions and the sealing state of the grease sealed inside the dummy workpiece is observed.

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