JPH0650284B2 - Slide type friction tester - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a slide-type friction tester, and more specifically, in imparting a constant initial velocity to a sliding body, without using any special means, and in performance. The present invention relates to a slide type friction tester capable of accurately testing the frictional force of a sample approached by.

[Prior art]

Conventionally, as a friction tester for a rubber material or the like, for example, a pendulum type friction tester for obtaining a friction coefficient by rocking a rubber sample while contacting it with the road surface, or rotating the rubber sample without contacting it with the road surface Known are a pin-on-disc type friction tester for determining the coefficient of friction, a rotation reduction type friction tester (Japanese Patent Publication No. 53-34725 and Japanese Patent Publication No. 53-57082), and the like.

In addition, in addition to this, a slant type friction tester that determines the friction coefficient from the sliding speed of an object on a slope with a rubber sample in contact with a constant slope and the angle of the slope at which the object starts to slide (Japanese Patent Publication No. -44137) is also known.

[Problems to be Solved by the Invention]

However, such a conventional friction tester is of a type in which the friction coefficient is obtained in the state where the rubber sample is brought into contact with the road surface from the beginning, and therefore, when a sample having physical properties close to each other is tested, a driving means for the sample is used. There is a problem in that it is not possible to obtain the difference in friction coefficient between the samples whose performances are close to each other due to road conditions, road conditions, etc. Therefore, it is not possible to perform a highly accurate friction test.

The present invention has been devised by focusing on such a conventional problem, in which a sliding body to which a sample is attached is fixed at a certain height.
The slide is slid out by its own weight from a slide having a constant inclination angle, jumps out of the flat running portion, and the sample comes into contact with the road surface and stops due to the frictional force of the sample. To provide a slide-type friction tester capable of performing a friction test with a slight difference by measuring this distance, without providing a means for giving an initial velocity, with good accuracy even for samples having similar performances. The purpose is.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a slide having constant inclination angles with guide rails parallel to the longitudinal direction on both side edges, and a self-propelled slide along the guide rails of the slide. It consists of a runner that jumps out onto the road surface at an initial speed, at least one sample can be attached to the bottom of the runner, and the tip of the sample comes into contact with the road surface when the runner comes to the flat running part. The gist of the invention is to provide a sample attachment jig that can be adhered.

[Operation of the invention]

According to the present invention, at least one sample is attached to the bottom of the sliding body constructed as described above, and the sliding body is slid out at its constant height from a slide having a constant inclination angle by its own weight. Let's get on the road surface from the flat running part at a constant initial speed. And by measuring the moving distance of the sliding body until it stops due to the frictional force of the sample,
Characterized by examining the friction performance of the sample.

Example of Invention

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a slide 1 that constitutes a slide-type friction tester for friction test on ice according to the present invention.
The sliding body 2 to which the rubber sample W is attached is slidably mounted on the top.

The slide 1 has a constant height (1 m in this embodiment).
And a constant inclination angle (30 ° to 50 ° in this embodiment)
Metal guide rails 4a and 4b parallel to the longitudinal direction are attached to the hypotenuse portion of the three-dimensional frame 3 configured as described above, and the guide rails 4a and 4b are inclined portions R.
And a flat running portion S connected to the flat running portion S.
Are configured to be connected to the road surface T (on ice).

Further, a hook 5 for retaining the sliding body 2 is attached to the upper part of the frame 3 of the slide 1, and when the sliding body 2 is slid out at a constant initial speed, the hook is provided on the rear end side of the sliding body 2. 5 is locked.

Next, the sliding body 2 sliding along the guide rails 4a and 4b is engaged with the guide rails 4a and 4b on both front and rear portions of the base plate 6 as shown in FIGS. 3 to 7. Sliding sliding members 7a and 7b are attached, and four door rollers are used as the sliding members 7a and 7b in this embodiment.

Further, as described above, the guide rails 4a and 4b are two metal plates arranged in parallel, and the sliding body 2 slides on the guide rails 4 using four door rollers. Therefore, the resistance is extremely low. In addition, it is possible to smoothly run without making noise.

The sliding members 7a and 7b are not limited to door rollers, and may be sled-shaped members that slide along the guide rails 4a and 4b, for example.

Guide frames 8 are provided on both sides of the upper surface of the base plate 6.
a and 8b are attached to the guide frames 8a and 8b
A weight G having a predetermined weight is detachably attached between them.

Further, on the bottom surface side of the base plate 6, as shown in FIGS. 3 to 5, a symmetrical position on the front side of the base plate 6 with the center line XX of the lateral width H of the sliding body 2 as the center. Is provided with sample attachment jigs 9a, 9b for detachably attaching the plate-shaped rubber sample W, and a rotatable caster 10 is attached on the central line XX on the rear side of the base plate 6. Has been.

As shown in FIGS. 7 and 9, the sample mounting jigs 9a and 9b are composed of a fixed metal fitting 11 and a movable metal fitting 12, and the movable metal fitting 12 is a bracket suspended from the base plate 6. It is attached to the elongated hole 14a of 14 through a screw member 14b so as to be movable and adjustable.

The rubber sample W is press-fitted and mounted in the gap h between the fixed fitting 11 and the movable fitting 12.

Also, the sample mounting jigs 9a and 9b for the rubber sample W
The projecting length is set so that the tip of the rubber sample W comes into contact with the road surface when the sliding body 2 comes from the inclined portion R to the flat running portion S and further moves on the road surface T (on ice). There is.

The movable fitting 12 is constructed so as to be movable by removing a screw or the like, and the gap h with the fixed fitting 11 can be adjusted according to the thickness of the rubber sample W. Further, 13 is a rod-shaped tipping prevention jig for preventing the rubber sample W from falling backward when the sliding body 2 slides, and the bracket 1 is attached to the bottom surface of the front side of the base plate 6 described above.
It is fixed through 4.

As described above, the sliding body 2 includes one caster 10 and
The rubber sample W mounted on the two sample mounting jigs 9a and 9b is supported at three points, and the sliding body 2 is supported by the guide rail 4
When the vehicle runs on the road surface T (on ice) by gliding on a and 4b, the straight running stability of the sliding body 2 is enhanced.

Although the rubber sample W is attached to each of the sample attachment jigs 9a and 9b in the above embodiment, the present invention is not limited to this. One long plate-shaped rubber sample W is attached to the sample attachment jigs 9a and 9b. It is also possible to test by mounting it on.

Further, in FIGS. 2 to 7, reference numeral 15 is a handle of the sliding body 2 attached to the rear end side of the base plate 6, and 16 is a weight G1 detachably attached to the bottom portion of the base plate 6. There is.

Next, FIGS. 11 to 14 show the sample mounting jig 9
a and 9b of another embodiment, which is different from the first embodiment in that the plate-shaped rubber sample W is not used,
A sample mounting jig 1 for mounting a semi-arcuate rubber sample W1 in which a portion in contact with the road surface is formed in an arc shape.
7 is shown. That is, when the semi-circular rubber sample W1 is mounted, it cannot be mounted with the press-fitting type sample mounting jigs 9a and 9b as in the first embodiment, so that the pedestal 18 having the concave cross section is mounted on the bracket 14. And, on this pedestal 18, an adhesive or
The sample fixing hook 19 as shown in the figure and the sample fixing screw 20 are used for fixing.

As a result, not only the plate-shaped rubber sample W1 but also
A semi-circular rubber sample W1 can also be attached to perform a friction test on ice.

Next, a friction test method using the slide-type tester having the above configuration will be described.

First, the rubber sample W having a predetermined shape is attached to the sample attaching jigs 9a and 9b provided on the bottom of the sliding body 2, and the weights G and G1 having a predetermined weight are attached to the sliding body 2. Then, the rear end side of the sliding body 2 is locked to the hook 5 provided on the upper portion of the frame 3 of the slide 1, and the preparation for the test is completed.

When the hook 5 is removed from this state, the sliding body 2 starts to slide along the guide rails 4a and 4b by its own weight, and the sliding body 2 sliding on the road surface T (on ice) at a constant initial velocity from the parallel portion S Due to the frictional force of the rubber sample W that comes into contact with the road surface, the rubber sample W is decelerated and stopped. The friction performance of the rubber sample W is investigated by measuring the moving distance of the sliding body 2 at this time.

The sample is not limited to rubber as described above, and a synthetic resin material or the like may be used.

Then, when the same test is performed next, the rubber sample W after the test is removed from the sample mounting jigs 9a and 9b, a new rubber sample W is mounted next, and the same test is repeated.

Next, the result of an experiment using the above tester will be described.

(a) Shape of rubber sample A cube having a side of 25 mm and a thickness of 8 mm was used, and vulcanized natural rubber was used as a material.

(b) Road condition: ice.

As a result of the above measurement data, the variation in data was R / = 4.5% R: 22 cm,: 500 cm (5 m) When the sliding body 2 slid 5 m, there was a variation of about ± 11 cm.

As a result, the reproducibility was good and the variation was small, and it was found that the friction test was highly accurate.

〔The invention's effect〕

As described above, according to the present invention, a slide having a constant inclination angle, which has guide rails parallel to the longitudinal direction on both side edges as described above, is self-propelled along the guide rails of the slide and has a constant initial velocity. At the bottom of the runner, at least one or more samples can be attached, and the tip of the sample contacts the road surface when the runner comes to the flat running part. Since the sample attachment jig that can be adhered is provided, the following excellent effects are exhibited.

(a) By sliding the bogie from a certain height, it can be slid on the road surface at a constant initial speed, and by changing the height at which it starts sliding, the initial speed can be changed.

(b) Since no means for giving the initial speed is used,
Immediate measurement is possible at any place.

(c) In the case of the friction test on ice, since the sample goes straight, the generation of water film is small, and the slight difference between the samples obtained by the conventional rotary friction tester can be clearly known.

In particular, it is possible to perform a friction test with good accuracy even on samples with close performance, and with a clear difference.

[Brief description of drawings]

FIG. 1 is a perspective view of a slide according to the present invention, FIG. 2 is a perspective view showing a state in which a slide is placed on the slide, FIG. 3 is a front view of the slide, and FIG. IV-IV in Fig. 3
FIG. 5 is a side view seen from the arrow, FIG. 5 is a side view seen from the arrow VV of FIG.
FIG. 7 is a plan view of the sliding body, FIG. 7 is a bottom view of the sliding body, FIG. 8 is an enlarged front view of the sample mounting jig, FIGS. 9 and 10.
The figure is a detailed view of the sample mounting jig, Figs.
The figure shows another embodiment of the sample mounting jig,
The figure is an enlarged front view of the sliding body to which the sample attachment jig is attached, and FIG. 12 is a left side view of FIG. 11, FIG. 13 and FIG.
FIG. 4 is a side view and a bottom view of the sample mounting jig showing a state in which the sample is mounted on the mounting jig. 1 ... slide, 2 ... planer, 4a, 4b ... guide rail, W ... sample.

Claims (1)

[Claims] 1. A slide having a constant inclination angle, provided with guide rails parallel to the longitudinal direction on both side edges, and a self-propelled slide along the guide rails of the slide, and on a road surface at a constant initial speed. At least one sample can be attached to the bottom of the runner, and the tip of the sample can be attached so that the runner comes into contact with the road surface when the runner comes to the flat running part. A slide-type friction tester, which is equipped with a sample attachment jig.