JPS61210926A - Multi-staged friction and wear tester - Google Patents

Abstract

PURPOSE:To conduct simultaneously friction and wear tests of plural test pieces with a low-priced instrument by installing a rotating main shaft driven by a single motor on a tester through a variable speed device, whose speed can be controlled, during drive. CONSTITUTION:The tester 1 has the single built-in motor 2, and driven by the motor 2 through the variable speed device 3. The rotating main shaft is installed thereon. The device 3 is so constituted that its variable speed ratio can be switched by an electrical signal even when the torque of the motor 2 is speed-changed and transmitted to the main shaft 4, whereby the friction speed can be changed at random while the coordinate wear test is conducted. The rotation of the main shaft 4 driven through the device 3 is transmitted by winding a belt 6 between the output shafts of the device 3, or by other transmitting means. The torque is so constituted that it can be transmitted to the center of the main shaft 4, and the main shaft 4 is pivoted by bearings 7 and 7 at both sides of said center.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiple friction and wear tester used for evaluating the performance of lubricants and sliding materials.

[Prior Art] Conventionally, the performance evaluation of lubricants and sliding materials with respect to friction and wear has been carried out by, for example, gradually increasing the load at a constant speed and determining the load up to which seizure does not occur.
Even if tested at the limit load in this way, it does not necessarily match the actual operating conditions of the equipment using the sliding material, etc. In other words, it is almost impossible for the equipment to actually be operated at the limit load. , it cannot be said that an appropriate evaluation is being carried out.

Therefore, it is necessary to conduct tests under conditions close to actual operating conditions, but since the performance of lubricants and sliding materials is influenced by a large number of factors, it is necessary to conduct tests in conditions close to actual operating conditions. It is necessary to conduct tests under a wide range of conditions.

However, with conventional friction and wear testing machines, it is not possible to test a large number of specimens at the same time, and even if a large number of similar testing machines can be placed side by side to perform tests, in this case the equipment cost is high. Also, maintenance costs will increase.

[Problems to be Solved by the Invention] The present invention allows friction and wear tests to be performed on multiple test pieces at the same time using a relatively inexpensive device, and at the same time, different test conditions can be set for each test piece. to facilitate testing in a wide range of conditions, and to
The purpose is to improve the efficiency of selecting and developing sliding materials.

[Means for Solving the Problems] In order to achieve the above object, the multiple friction and wear testing machine of the present invention has a single motor mounted on the machine body via a speed change device capable of speed control during rotational driving. The rotating main shaft is connected to the transmission so that rotational power is transmitted to the central part of the rotating main shaft, and an arbitrary number of ring-shaped slides are provided on both sides of the central part of the rotating main shaft. A load-loading device that allows sliders to be fitted into the sliders, and that is provided with a holder that holds a test piece in correspondence with each of the sliders, and that applies a load to each test piece via a load cell; The present invention is characterized in that an oil tank for supplying lubricant between each slider and test piece is provided independently for each pair of slider and test piece.

[Function] According to the multiple friction and wear tester of the present invention having the above configuration, friction and wear tests can be performed on a plurality of test pieces at the same time by driving a single motor, and at the same time, sliding The speed was varied accordingly and the oil bath contained a different lubricant for each specimen.

Alternatively, different test conditions can be set for each test piece by changing the load applied to each test piece using a load loading device, and therefore tests can be easily conducted under a wide range of conditions.

In addition, since the rigidity of a rotating shaft generally decreases as it moves away from its driving side base end, in the present invention, this is effectively utilized to transmit rotational power to the central portion of the rotating main shaft. As mentioned above, it is designed to perform heavy load tests on one side and light load tests on both ends.

Since the testing machine of the present invention is designed to perform tests within a range where seizure does not occur, the maximum load is not applied to all test pieces, and usually multiple test pieces are tested with the same load. Friction and wear tests can be carried out at the same time, and even if a test needs to be carried out under a large load, the test can be carried out easily with the slider and test piece located close to the center. .

〔Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

In the multiple friction and wear testing machine shown in FIGS. 1 and 2, a body 1 of the testing machine is equipped with a single motor 2 therein, and a transmission 3 is driven by this motor 2. The above-mentioned transmission device 3 is designed to be able to change the gear ratio using an electrical signal even while transmitting the rotational force of the motor 2 to the rotating main shaft 4 at various speeds. Friction speed can be varied.

The rotating main shaft 4 driven through the transmission fi13 is a transmission! The rotation is transmitted by a belt 8 wrapped around the output shaft of the i3 or by other transmission means, but the rotational power is transmitted to the central part of the rotating main shaft 4, and the rotation is transmitted on both sides of that part. The main shaft 4 is supported by bearings 7, 7.

As shown in detail in Figure 3, on the rotating main shaft 4 supported by the bearing 7.7 and extending on both sides thereof, an arbitrary number of ring-shaped sliders 10, 10, . ... can be fitted, and their sliders 10.10. A holder 12 for holding the test piece 11 is disposed corresponding to... The sliders 10.1G, . . . are paired with the corresponding test piece 11, and the test piece 1
In the illustrated embodiment, a slider is installed between the bearing 7 and the bearings '14 and 15, which are successively provided on the shaft end side. 10.10 can be fitted and sealing walls 18,1? located on both sides of each of these sliders. between and seal 1t
An oil tank 2 for storing lubricant in the space between s and ts
0.21. Further, the shaft end of the one-rotation main shaft 4 is made to protrude like a cantilever so that the slider 22 can be preliminarily fitted, but the number of these sliders can be changed as appropriate.

Each slider 10.22 can be replaced by removing a nut 23 screwed onto the shaft end and sequentially pulling out the sleeves from the rotating main shaft 4.

As shown in FIGS. 3 and 4, holders 12, 12 for the test piece 11 provided corresponding to each slider to, to on the rotating main shaft 4 hold and slide the test piece 11. Move!
0, and each holder 12 is a load-bearing device! It is detachably attached to the pressurizer 27 of t25. That is, the groove 2B provided in the holder 12 is used as a load bearing device! 25 is fitted and locked onto the protrusion 28 of the pressurizing element 27, and the two are fixed with screws 28 or the like.

The presser 27 is equipped with a load cell 30, which applies a load to the test piece 11 via the load cell 30, and the upper end of the presser 27 is connected to one end of a horizontal rod 32 that applies the load. This horizontal rod 32 has an intermediate position as a fulcrum 33
The other end is connected to a dashpot 34 for vibration prevention, and connected to one end of a second horizontal rod 37 via a connecting link 35. Second
Similarly, the horizontal rod 37 is swingably supported at an intermediate position at a fulcrum 38 so that a load from a weight 38 can be applied to the tip, but the fulcrum 38 and the weight 39 are attached at an intermediate position. In order to unload the test piece in case of seizure or to stop the test midway through, the cylinder is used to remove the load from the horizontal rod 3
7 is provided.

In the above description, the structure of one side from the center of the rotational main shaft has been described, but as can be seen from FIG. 1, both sides of the center of the rotational main shaft can be configured almost symmetrically.

In addition, in the above-mentioned test machine, the sliding speed of the slider (
In the experimental example, a control unit that controls the speed (2 to 3750 rpm) together with the load, a processing device that processes measurement data, and a recording device that records the data can be provided.

In the multiple friction and wear tester having the above configuration, the test piece 11 is pressed against the slider 10 of the rotating main shaft 4 by the load applying device 25, and the transmission is controlled by the drive of the motor 2! By rotating the rotary main shaft 4 via the main shaft 13, a friction and wear test can be performed simultaneously on a plurality of test pieces 11 set on the main shaft 4. In addition, during the test, the sliding speed was controlled by the speed change device 3 that can control the speed while the main shaft 4 was being rotated, and a different lubricant was stored in the oil tank 20.21 for each test piece 11.
Alternatively, by changing the load applied to each test piece 11 by the load loading device 25, different test conditions can be set for each test piece, thereby making it easy to conduct friction and wear tests under a wide range of conditions. can.

〔Effect of the invention〕

As detailed above, according to the multiple friction and wear tester of the present invention, it is possible to perform friction and wear tests on multiple specimens simultaneously under a wide range of conditions, and the apparatus is relatively inexpensive. This makes it possible to improve the efficiency of selecting and developing lubricants and sliding materials.

[Brief explanation of the drawing]

FIG. 1 is a front view of a multiple friction and wear tester according to the present invention;
FIG. 2 is a side view of the same, FIG. 3 is an enlarged cross-sectional view taken along the main axis of rotation of the testing machine, and FIG. 4 is an enlarged side cross-sectional view of the same. 1. Life and aircraft, 2. Motor. 3-...Transmission device, 4...Rotating main shaft, lO...Slider, 11...Test piece, 12...Holder, 17,
18--Oil tank, 25--Loading device, 30--Load cell. Low

Claims (1)

[Claims] 1. A rotating main shaft driven by a single motor via a speed change device that can control the speed during rotational driving is provided on the aircraft body, and the rotating main shaft is changed in speed so that the rotational power is transmitted to the center of the rotating main shaft. A holder that is connected to the apparatus and that allows an arbitrary number of ring-shaped sliders to be fitted on both sides of the central portion on the rotating main shaft, and that holds a test piece in correspondence with each of the sliders. A load-bearing device that applies a load to each test piece via a load cell, and an oil tank for supplying lubricant between each slider and the test piece are installed in each pair of sliders. and a multiple friction and wear tester, characterized in that it is installed independently for the test piece.