JPS63297106A - Spikeless tire - Google Patents

Abstract

PURPOSE:To improve the spike function without deteriorating a common road by forming a tread rubber by compounding the specific silicic acid glass having an average particle diameter by a specific quantity into a rubber component. CONSTITUTION:Tread rubber is formed by compounding the silicic acid glass having an average particle diameter of 80 mesh or less, e.g., silica glass and soda lime glass, etc. in 15-30wt.% for 100pts.wt. of rubber component. With such constitution, the silicic acid glass is exposed onto the tread surface and develops the spike function. However, since the silicic acid glass drops off with the abrasion of the tread rubber, the paved road surface is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spikeless tire equipped with a tread that has excellent performance on snow and ice.

[Conventional technology]

Generally, spikeless tires are required to have sufficient driving and braking performance on snowy and icy roads.
Therefore, the tread portion of the tire needs to have sufficient frictional force (grip force) against the snowy and icy road surface. The friction force generation mechanism of conventional spikeless tires has been explained as follows.

(1) When the tread pattern grooves tread on the snow, the shearing force of the snow and the pattern grooves engage, resulting in frictional force.

(2) Deformation loss friction force generated by deformation of tread rubber.

(3) Adhesive frictional force that causes the tread rubber surface to adhere to the snow and ice surface.

On the other hand, the friction force generation mechanism of conventional spiked tires is thought to be mainly due to the friction force generated when the spikes embedded in the tread rubber scratch the ice surface.

Therefore, in order to improve the driving force and braking force of tires on snowy and icy roads, it is necessary to increase the frictional force mentioned above. Method (3) to increase the friction force, or method (1) to increase the friction force by creating a block shape with an acute angle in the tread pattern and widening the area of the groove part so that the tread pattern bites into the snow even more, etc. are adopted. ing.

However, with these tread formulations and tread shapes,
It is not very effective on icy roads or compacted snow roads; for example, on smooth, compacted snow roads, the pitching performance of this type of tire is limited to a slope of 7 to 10 degrees, which is higher than the limit slope of 3 degrees for spiked tires. In comparison, it is considerably inferior. On the other hand, spiked tires can be used on asphalt roads.
This is causing dust pollution and has become a social problem.

[Problem that the invention seeks to solve]

Therefore, the present invention provides excellent driving force on snowy and icy roads without damaging the asphalt road surface (-ship road surface).
The purpose of the present invention is to provide a spikeless tire that can maintain braking force and is suitable for driving on any road surface.

(Means for Solving the Problems) The present invention provides a spikeless tire having a tread rubber containing 15 to 15% SOW of Kei-8M glass having an average particle size of 80 mesh or less to 100 parts by weight of Go-11 component. be.

Silica glass, soda-lime glass, lead glass, aluminoborosilicate glass, borosilicate glass and aluminosilicate glass are used here as the siliceous glass. In addition, when these silicone F11T glasses are buried in the tread rubber, the siliceous glass exposed on the tread surface causes a scratching phenomenon on the road surface, which improves the adhesion between the tread rubber and the road surface, especially on icy roads. In,
Provides the same frictional force as traditional spikes.

Note that since the siliceous glass falls off as the tread rubber wears, it can prevent damage to the paved road surface.

This silicate glass contains 15 parts by weight per 100 parts by weight of the rubber component.
~30 weight N9≦ is blended, but if it is less than 15% by weight, the frictional force on icy road surfaces will not be sufficient, while if it exceeds 30% by weight, the flexibility of the trend rubber will decrease and the tread rubber will deform. The resulting deformation loss frictional force and the adhesive frictional force that causes the tread rubber surface to adhere to the snow and ice surface are insufficient, and the trend rubber is prone to chipping.

The average particle diameter of the siliceous glass is in the range of 5 to 80 meshes, preferably 7 to 15 meshes.

If the particle size of the siliceous glass is smaller than 5 mesh, the frictional force on the icy road surface will not be sufficient, and on the other hand, when running on a tire with a diameter exceeding 80 mesh, the siliceous glass will fall off due to the tread rubber being deformed. becomes intense.

The tread rubber used in the present invention is manufactured by J.I.S.A.
It is desirable to use a relatively soft rubber composition with a hardness in the range of 50° to 60° at room temperature, and by employing such a tread rubber, the deformation loss friction force and adhesion can be reduced. ! ! Friction force can be further improved.

〔Example〕

Tread rubber having the formulation shown in Table 1 was prepared and applied to a radial tire with a tire size of 165SR13. The braking performance of these tires on 9-pressure snow, extremely compacted snow, and water basin (Table 3), tentative climbing performance on normal and smooth compacted snow (Table 4) Tsurutsuno L4th-Tsurutsuno: J+
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was evaluated.

As is clear from Section 3.4&, the examples of the present invention exhibit better braking and hill climbing performance than conventional spikeless tires.

Notes in the table are as follows.

Note 1) Silicate glass has a purity of 80% or more and is DEC, S.
Treated with SA 5t-69.

Note 2) Braking test: A speed and braking distance measuring device and test tires are attached to the test vehicle, the test vehicle is driven at a constant initial speed on the test road surface, and the test vehicle is stopped at a certain point by applying sudden braking until the vehicle comes to a stop. The braking distance was measured.

Note 3) The pitching test was conducted on four lanes with gradients of 4, 7, 10, and 13%, and the test vehicle was stopped on the pitching road (normally packed snow) and then started to confirm whether it could start.

Furthermore, we measured the climbing acceleration performance when it was possible to start even on the steepest slopes.

The climbing acceleration time calculation method was a zero start acceleration method, the test vehicle was started from a stopped state, and the climbing acceleration time for a 30 m section was measured. At this time, the gear was set to 1st speed.

Note 4) Road surface description Normally compacted snow A road surface where snow has been compacted using tire rollers or dump trucks.

(Coefficient of friction is around 0.28 for studless tires) Smooth and compacted snow A road surface made from normal compacted snow that has been repeatedly braked by a passenger car to make it smooth (coefficient of friction for studless tires is about 0.28) Ice floes Smooth and compacted snow with the goal of creating ice burns similar to actual roads. The road surface was frozen by spraying water in the form of a mist and then compacting it with tire rollers.

(Coefficient of friction is around 0.11 for studless tires) [Effects of the invention] As mentioned above, in the present invention, a predetermined amount of silicic acid glass with an average particle diameter of 5 to 80 mesh is blended into the tread rubber, so that deformation does not occur. In addition to loss frictional force and adhesive frictional force, the frictional force caused by scratching on the snow, which is the effect of spiked tires, increases, and braking, driving characteristics, and climbing performance are further improved compared to conventional spikeless tires.

Claims (2)

[Claims] (1) The average particle diameter is 80 parts by weight per 100 parts by weight of the rubber component.
A spikeless tire having a tread rubber containing 15 to 30% by weight of siliceous glass of mesh size or smaller. (2) JISA hardness of tread rubber at 20℃ is 5
The spikeless tire according to claim 1, wherein the angle is in the range of 0° to 60°.