JPH08145866A - Moistening abrasion testing machine - Google Patents

Abstract

PURPOSE: To provide a moistening abrasion testing machine by which a high- speed abrasion test can be performed and slipping rate of a rubber test piece can be also controlled, and further the abrasion performance of the test piece can be measured on the moistened road surface while the state of moistened road surface in any climate condition or water temperature condition is set to almost the same that in the tire running condition. CONSTITUTION: A water supply means 20 is provided above the contact part X of a grinding disc 4 and a rubber test piece 6 in order to pour a specified amount of water W at a set temperature to the contact part X thereof. In the means 20, a nozzle 21 is fitted on the upper side of a thermostat 2 to pour the water W to the contact part X, and it is connected to a water feeding tank 25 in a water feeding thermostat 23, which controls the water W at a constant temperature, by a conduit 22 and quantitative pump 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet abrasion tester, and more particularly, to a wet abrasion test for measuring the wear performance of a rubber test piece such as a tire tread rubber on a wet road surface during rainfall. The present invention relates to improvement of an abrasion tester.

[0002]

2. Description of the Related Art Conventionally, many abrasion testers for simulating the abrasion performance of rubber test pieces such as tire tread rubber have been proposed, which are stipulated in JIS K 6264 as a typical abrasion tester. Lambourn testing machines are known. For example, as a conventional wear test apparatus, as shown in FIGS. 4 and 5, a disk-shaped grindstone rotatably supported via a grindstone shaft 3 inside a constant temperature bath 2 installed on a pedestal 1. 4 and a disk-shaped rubber test piece 6 which is pressed laterally against the outer peripheral surface of the grindstone 4 by a constant load through a pressing means 5 (load applying device) and is rotationally driven. There is.

A grindstone shaft 3 for rotatably supporting the grindstone 4.
Is rotated at a predetermined rotation speed via the drive motor 7,
Further, the rubber test piece 6 is configured to be rotationally driven by a drive motor 10 attached to the rotary shaft 8 via a joint 9. A torque meter 11 is attached to a rotary shaft 8 that supports the rubber test piece 6, and a load cell 12 is provided at the rear end of the pressing means 5 that presses the rubber test piece 6 against the grindstone 4 with a constant load. Is provided.

Above the contact portion between the disc-shaped grindstone 4 and the rubber test piece 6, a wear sand nozzle 13 for supplying wear sand to the contact portion during a wear test is suspended.
Is connected to a falling sand container 14 installed above the constant temperature bath 2. In FIG. 4, 15 is a sand collecting device, 16a
Is a load weight, 16b is a balance weight, and 17 is a pressing cylinder.

However, it is difficult to measure the wear performance of a rubber test piece on a wet road surface by simulating the wear performance of a rubber test piece with the above-described wear test apparatus. Therefore, an improved version of the Taber abrasion tester has been proposed as a device for measuring the abrasion performance on a wet road surface (Jitsuko Sho 61).
-1085050). This abrasion tester is equipped with a liquid injection port above the rotating disc when contacting a metal wear ring under load to a test piece attached to the rotating disc to provide a liquid injection port above the rotating disc. Is a device having a liquid receiving pan provided below the device and performing a wear test in a state where liquid exists between the test piece and the wear wheel.

[0006]

However, in the case of the wear test in which the liquid is interposed between the test piece and the wear wheel as described above, the test piece is rotatably installed horizontally. Since it is a method of testing wear by contacting a metal wear wheel while supplying water from the orthogonal direction, the sliding speed is slow, and in order to measure the wear amount without controlling the water temperature,
It is extremely difficult to simulate and measure the actual wear performance on a wet road surface.

That is, the wear performance on a wet road surface varies depending on the atmospheric temperature and the change in the water temperature due to the change of the season, and therefore the condition of the test piece changes. Therefore, it may be measured without controlling the atmospheric temperature and the water temperature condition. However, it is difficult to measure the wear performance on an actual wet road surface. The present invention has been devised by focusing on such conventional problems, and is capable of performing a high-speed wear test and also capable of controlling the slip ratio of a comb test piece, and in addition to all climatic conditions and An object of the present invention is to provide a wet wear tester capable of measuring the wear performance of a rubber test piece on a wet road surface by setting the condition of the wet road surface under water temperature conditions to be substantially the same as the tire running condition. It is a thing.

[0008]

In order to achieve the above object, the present invention provides a disk-shaped grindstone which is rotationally driven at a predetermined peripheral speed, and a pressing means which is lateral to the outer peripheral surface of the grindstone. A disc-shaped rubber test piece that is pressed by a predetermined load and is rotationally driven is internally provided, and a contact portion between the grindstone and the rubber test piece is provided above the contact portion between the disc-shaped grindstone and the rubber test piece. The gist of the present invention is to provide a water supply means for discharging a predetermined amount of water.

Further, water thickness holding members for adjusting the supplied water to a uniform thickness on the grindstone are provided on both sides of the contact portion between the grindstone and the rubber test piece. A nozzle that discharges water to the contact part with the test piece is attached to the upper part of the constant temperature tank, and this nozzle is connected to a constant temperature water supply tank that controls the water at a predetermined temperature via a conduit via a metering pump. is there. It is also possible to provide the grindstone and the rubber test piece inside a constant temperature bath controlled to a constant temperature.

[0010]

The present invention is constructed as described above, and the grindstone and the rubber test piece are rotationally driven inside the constant temperature bath.
By pressing the rubber test piece against the grindstone with a predetermined load, a high-speed wear test can be performed, and the grindstone and the rubber test piece are individually driven by their own peripheral speeds. Since it is possible to control the slip ratio of comb test piece, the temperature inside the thermostatic chamber where the test piece is installed and the temperature of water supplied to the contact part between the grindstone and the rubber test piece can be controlled. By setting the conditions substantially the same as when the tire is running, it is possible to measure the wear performance of the rubber test piece with high accuracy, especially on a wet road surface at a low temperature.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a schematic configuration diagram of a wet abrasion tester embodying the present invention, FIG. 2 is a partially enlarged perspective view of a grindstone portion, and FIG. 3 is a bottom view of a nozzle of a water supply means.

In FIG. 1, reference numeral 2 is a constant temperature bath in which the temperature inside the bath is controlled to a predetermined temperature by a temperature control device (not shown), and 4 is a disk-like shape attached to a grindstone shaft 3 which is rotationally driven by a drive motor 7. A grindstone, 6 is a disc-shaped rubber test piece attached to the rotary shaft 8, and the disc-shaped grindstone 4 and the disc-shaped rubber test piece 6 are the grindstone shaft 3 and the rotary shaft 8 which are installed substantially parallel to each other. And is vertically arranged in the constant temperature bath 2.

The disk-shaped rubber test piece 6 is pressed against the grindstone surface 4a of the grindstone 4 by a constant load through a pressing means (load adding device) not shown, as in the conventional abrasion tester. And a rotating shaft 8 for supporting the rubber test piece 6
A torque meter (not shown) is attached to, and a load cell is provided at the rear end of the pressing means. Above the contact portion X between the disk-shaped grindstone 4 and the rubber test piece 6, water supply means 20 for discharging a predetermined amount of water W to the contact portion X between the grindstone 4 and the rubber test piece 6 is provided. The water supply means 20 is provided and the nozzle 2 for discharging the water W to the contact portion X is provided.
1 is attached to the upper part of the constant temperature bath 2, and this nozzle 21 is connected to the conduit 2
It is connected via a metering pump 24 to a water supply tank 25 in a water supply constant temperature tank 23 that controls the water W to a constant temperature via the water supply tank 2.

That is, the temperature in the constant temperature water supply tank 23 is controlled to a predetermined temperature by a temperature control device (not shown), and the water W in the water supply tank 25 installed therein is also controlled to a constant temperature. Is. Further, on both sides of the contact portion X between the grindstone 4 and the rubber test piece 6, as shown in FIG. 2, the water W supplied is kept in a plate-like water thickness for uniformizing the water W on the grindstone surface 4a. The members 26a and 26b are provided at positions facing each other, and the water W discharged from the nozzle 21 can be tested with a predetermined water thickness by the water thickness holding members 26a and 26b.

In order to keep the water thickness of the water W to be discharged constant, it is preferable that the cross-sectional shape of the tip of the nozzle 21 is rectangular as shown in FIG. In addition, a disc-shaped grindstone 4
At the side portion of the water supply means 20 provided above the contact portion X between the rubber test piece 6 and the rubber test piece 6, sand supply means 27 for sand for abrasion, which is supplied simultaneously with the water W, is provided as in the conventional case.

Below the contact portion X between the disk-shaped grindstone 4 and the rubber test piece 6 in the constant temperature bath 2, a worn test piece Wx is provided.
In addition, a duct-shaped collecting member 28 for collecting water W and sand for abrasion is installed, and the tip 28a of this collecting member 28 is installed.
Is the worn test piece W protruding from the lower part of the constant temperature bath 2.
x, water W, and sand for abrasion are connected to the container 29 of the test section.

In the accommodating container 29, the recovered worn test piece Wx and sand for abrasion are precipitated, and the supernatant water W is
Is discharged to the outside of the test apparatus by a pump 32 provided in a pipe 31 via a filter 30.
The present invention is configured as described above, and the grinding stone 4 and the rubber test piece 6 are rotationally driven inside the constant temperature bath 2, and the rubber test piece 6 is pressed against the grinding stone 4 by a predetermined load. Since a high-speed wear test can be performed, and the whetstone 4 and the rubber test piece 6 can be driven at a specific peripheral speed by a driving device provided separately,
The slip ratio of the comb test piece can also be controlled.

The temperature inside the thermostatic chamber 2 in which the rubber test piece 6 is installed and the temperature of the water supplied to the contact portion X between the grindstone 4 and the rubber test piece 6 are set to substantially the same conditions as when the tire is running. By doing so, it is possible to measure the wear performance of the rubber test piece with high accuracy particularly on a wet road surface at a low temperature.

[0019]

As described above, according to the present invention, a disc-shaped grindstone which is rotationally driven at a predetermined peripheral speed as described above, and the outer peripheral surface of the grindstone are laterally pressed by a predetermined load through pressing means. In addition, a disk-shaped rubber test piece that is driven to rotate is internally provided, and a predetermined amount of water is discharged to the contact part between the disk-shaped grindstone and the rubber test piece above the contact part. Since it has a water supply means that enables high-speed wear test, it can also control the slip ratio of comb test pieces, and it can run tires on wet road conditions under all climatic and water temperature conditions. By setting the conditions substantially the same as the conditions, there is an effect that the wear performance of the rubber test piece on the wet road surface can be accurately measured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a wet abrasion tester embodying the present invention.

FIG. 2 is a partially enlarged perspective view of a grindstone portion.

FIG. 3 is a bottom view of the nozzle of the water supply means.

FIG. 4 is a schematic front view of a conventional abrasion tester.

FIG. 5 is a plan view of FIG.

[Explanation of symbols] 2 thermostatic bath 3 grindstone shaft 4 grindstone 4a grindstone surface 6 rubber test piece 7 drive motor 8 rotary shaft 20 water supply means 21 nozzle 22 conduit 23 water constant temperature bath 24 metering pump 25 water supply tank X grindstone and rubber test piece Contact with water W

Claims (4)

[Claims] 1. A disc-shaped grindstone that is rotationally driven at a predetermined peripheral speed, and a disc-shaped grindstone that is pressed against a peripheral surface of the grindstone by a predetermined load from a lateral direction via a pressing means and is rotationally driven. The rubber test piece of, and above the contact portion between the disc-shaped grindstone and the rubber test piece, a water supply means for discharging a predetermined amount of water to the contact portion between the grindstone and the rubber test piece is provided. Wet wear tester characterized by. 2. The wet wear test according to claim 1, wherein water thickness holding members are provided on both sides of the contact portion between the grindstone and the rubber test piece so that the supplied water has a uniform thickness on the grindstone. Machine. 3. The water supply means is provided with a nozzle for discharging water at a contact portion between a grindstone and a rubber test piece, which is attached to an upper part of a thermostatic bath, and a constant temperature of water supply for controlling the water at a constant temperature through a conduit to the nozzle. The wet abrasion tester according to claim 1 or 2, which is connected to the tank via a metering pump. 4. The wet wear tester according to claim 1, wherein the grindstone and the rubber test piece are provided inside a thermostatic chamber controlled to a constant temperature.