JPH071270B2 - Lubricant tester - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil tester for evaluating the performance of lubricating oil, and more particularly to the structure of a sliding portion of a test piece.

[0002]

BACKGROUND OF THE INVENTION Lubricant performance is determined by the amount of active ingredients associated with the wear phenomenon contained in the lubricant. The performance of the lubricating oil is evaluated by examining the change over time in the concentration of the active ingredient. Conventionally, as a lubricating oil testing device used for the performance evaluation test of this lubricating oil, there is a device as shown in FIG.

That is, the rotary shaft 1 is placed in an oil bath pan 122 which houses an oil bath 101 made of test lubricating oil.
23 is rotatably inserted, and one disc-shaped test piece 106 is fixed to the rotary shaft 123.
Is rotated by the rotation of the rotating shaft 123, and the one cylindrical test piece 118 is brought into contact with the one rotating test piece 106, and thus the one test piece 106 and the second test piece 1 are contacted.
Sliding with 18 is realized in the oil bath 101, and the change of the effective component in the test lubricating oil constituting the oil bath 101 is measured to evaluate the performance of the lubricating oil.

[0004]

However, in such a conventional lubricating oil testing machine, since the amount of the testing lubricating oil stored in the oil bath pan is large, the effective component in the lubricating oil during the testing is large. The change in concentration is slow, and it takes a long time to evaluate the performance of the test lubricating oil.
Further, when the test lubricating oil is an expensive material that is difficult to obtain, the performance of the test lubricating oil cannot be evaluated by the conventional lubricating oil testing machine that uses such a large amount of the tested lubricating oil. Because of this, the amount of lubricant to be inspected is small,
In addition, it is desired to develop a lubricating oil tester that requires a short time for the evaluation test.

The present invention has been made in view of the above circumstances and requires a small amount of lubricating oil to be tested, and
It is an object of the present invention to provide a lubricating oil testing machine that requires a short time for evaluating the performance of a lubricating oil to be tested.

[0006]

To this end, the lubricating oil tester of the present invention is a lubricating oil tester for sliding two test pieces in an oil bath of the lubricating oil to be tested. The oil bath pan containing the oil bath is composed of one of the two test pieces and an annular frame that is liquid-tightly fixed to the one test piece, and one of the test pieces is configured to rotate on the rotating shaft. It is characterized by having done.

[0007]

[Function] In the lubricating oil tester configured as described above,
One of the test pieces and an annular frame that is liquid-tightly attached to the peripheral portion of the upper surface of the test piece cooperate to form an oil bath pan. In this oil bath pan, one test piece constitutes the bottom of the pan and the annular frame constitutes the side surface of the pan. The lubricating oil to be tested is supplied to the inside of the pan thus constructed, and the surface of one test piece is wetted with the lubricating oil to be tested.

In this state, the other test piece comes into contact with the surface of the one test piece. In this state, the rotary shaft rotates, and the sliding portions of the one test piece and the other test piece slide in the oil bath of the lubricating oil to be tested. The effective component concentration of the test lubricating oil in the oil bath is measured with time to evaluate the performance of the test lubricating oil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing an embodiment. 1 to 3, reference numeral 1 is a lubricating oil tester. The lubricating oil tester 1 includes a rotating shaft 2, and a test piece holder 3 is fixed to a flange on the top of the rotating shaft 2. The test piece holder 3 has a base 4 and an annular frame 5.

The substrate 4 has a circular shape, and a flat surface 7 on which one of the test pieces 6 is placed is provided on the upper surface thereof. Base 4
Is fixed to the flange 8 of the rotary shaft 2 at the lower end. On the other hand, the annular frame 5 has an annular shape having a diameter substantially equal to the diameter of the outer edge portion of the one test piece 6, and is in liquid-tight contact with the upper surface of the outer edge portion of the one test piece 6.

The test piece holder 3 is constructed by the base body 4 and the annular frame 5 cooperating with each other, and the base body 4 and the annular frame 5 cooperate with each other to fix the outer edge portion of one test piece 6 to the bolt 11. Sandwiched by.

As a result, the one test piece 6 and the annular frame 5 cooperate with each other to form a container shape with an open upper end, and the bottom surface of this container shape is composed of the upper surface 12 of the one test piece 6. The inner surface 13 of the annular frame 5 constitutes the container-shaped side surface.

An annular groove 15 is formed around the lower surface 14 of the annular frame 5, and an annular packing 16 is arranged in the groove 15, and an upper surface 12 of one test piece 6 is provided. The contact portion between the bottom surface 14 and the lower surface 14 of the annular frame 5 is kept liquid-tight.

A groove 17 for oil return is formed around the inner side surface 13 of the annular frame 5 so as to make one round. The exposed upper surface 12 of one test piece 6 is in contact with the other test piece 18. The other test piece 18 has a cylindrical shape, and the lower end surface thereof forms a sliding portion 21 with the upper surface 12 of the one test piece 6.

The lubricating oil 2 to be tested is placed in the oil bath pan 22.
3 is being supplied. However, the supplied lubricating oil 2
3 has not reached near the top of the oil bath pan 22,
It reaches only near the bottom, that is, just above the upper surface 12 of one of the test pieces 6.

The operation for carrying out the performance test of the lubricating oil in the lubricating oil tester 1 thus constructed is as follows. One test piece 6 is attached to the test piece holder 3, one test piece 6 and the annular frame 5 cooperate to form an oil bath pan 22, and this is attached to the rotary shaft 2.

The lubricating oil 2 to be tested is placed in the oil bath pan 22.
3 is supplied in a small amount, and the other test piece 18 is brought into contact with the one test piece 6 to form the sliding portion 21 between the two test pieces.
When the rotary shaft 2 is rotated from this state, one test piece 6
Rotates, and the other test piece 18 is in the fixed position, so that the one test piece 6 and the other test piece 18 slide.

At this time, since the sliding portions 21 of both test pieces are located in the oil bath pan 22 of the test lubricating oil 23, the effective component concentration is consumed over time. The performance of the lubricating oil 23 to be tested can be examined by measuring the change over time in the concentration of the active ingredient.

[0019]

In the lubricating oil testing apparatus thus constructed, since one test piece 6 constitutes the bottom of the oil bath pan, it is not necessary to prepare another oil bath pan, and a small amount of oil is not added to the oil bath pan. Since the sliding portions of both test pieces can be immersed only by inserting the test lubricating oil, the amount of the test lubricating oil required is small.

Therefore, as shown in FIG. 4, in comparison with the conventional test method using a large amount of lubricant to be tested, the lubricating oil tester of the present invention causes a rapid change in the concentration of the active ingredient in the lubricating oil. The performance evaluation test can be performed in a short time. In FIG. 4, in the lubricating oil tester of the present invention, 0.05 cc
The relationship between the concentration of the active ingredient and the time is compared between the case of using the above lubricating oil and the case of using 1 cc of the lubricating oil in the conventional lubricating oil tester.

Further, as described above, the present invention requires a small amount of the lubricating oil to be inspected, so that the performance evaluation test can be performed even on the expensive lubricating oil which is difficult to obtain.

[Brief description of drawings]

FIG. 1 is an explanatory view of a longitudinal section of a lubricating oil tester.

FIG. 2 is a plan view of a lubricating oil tester.

FIG. 3 is an enlarged view of part A in FIG.

FIG. 4 is a graph showing changes with time of the active ingredient concentration of the lubricating oil to be tested.

FIG. 5 is an explanatory longitudinal sectional view showing a conventional lubricating oil tester.

[Explanation of symbols]

 1 Lubricating oil tester 2 Rotating shaft 3 Test piece holder 4 Base 5 Ring frame 6 One test piece 7 Plane 8 Flange 11 Bolt 12 Upper surface 13 Inner side surface 14 Lower surface 15 Groove 16 Packing 17 Groove (for oil return) 18 Other Test piece 21 Sliding part 22 Oil bath pan 23 Test lubricant oil 101 Oil bath 106 One test piece 118 Second test piece 122 Oil bath pan 123 Rotating shaft

Claims (1)

[Claims] 1. A lubricating oil tester for sliding two test pieces in an oil bath of a lubricating oil to be tested, wherein an oil bath pan containing the oil bath is used as one of the two test pieces. A lubricating oil testing machine comprising a ring-shaped frame liquid-tightly fixed to the one test piece, and the one test piece being rotated by a rotary shaft.