JPS60185606A - Spike tire - Google Patents

Abstract

PURPOSE:To automatically retract spike tire pins into a tire when operating on a non-frozen road so as to prevent both pulverization of the road surface and ensuing public nuisance, by placing the tire spike at the tip of a coil spring made of a shape storing alloy. CONSTITUTION:A container box 1 is formed in a concave section 3 of a spike tire 2 as an integrated unit and one end of a coil spring 5 is fixed to the bottom of the box 1 by means of a fixing member 6 while a spike tire pin 4 is placed at the other end. The coil spring 5 is made of a shape storing alloy and it is so constituted as to maintain its metalic composition by balancing its martensite shape changing temperature against the friction temperature between the tire and the non-frozen dry road surface. Upon contact with the frozen road surface, the tire is rapidly cooled aa well as the temperature of the coil spring 5 is lowered, extending the coil spring 5 to push the spike tire pin 4 out of the tire 2 surface and the tire 2 will act as a spike tire.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to the structure of a pin for a spiked tire.

(b) Prior Art Conventionally, spiked tire pins have been integrated with the tire by providing a flange in the middle and inserting one end of the flange until the flange is still in contact with the tire surface.

The other end was made to protrude from the surface of the tire.

(c) Problems with the conventional method In this way, the conventional s i'? Since the pins of tires always protrude from the surface of the tire, the frictional resistance of the pins increases the braking ability of the car on frozen roads, preventing slips and slips on the road surface.

When driving on non-frozen (dry) roads, vehicles scrape the asphalt or concrete road surface, creating dust pollution, which has become a major social problem, especially in snowy regions.

B) Purpose of the Invention The present invention provides a spiked tire in which pins protrude to prevent slipping when driving on frozen roads, and automatically retract when driving on dry roads to prevent dust pollution. It is something to do.

(E) Structure of the present invention The present invention forms a plurality of recesses on the surface of the tire.

At the bottom of each of the four parts, the other ends of coil springs each having a S.P. It is a spiked tire.

A plurality of four parts are still formed on the surface of the tire, and the other end of a coil-bye having a spike tire pin at one end is fixed to the bottom of each of the four parts, and a coil by-piece having a spike tire pin at one end is respectively fixed, and a coil by-piece having a spike tire pin at one end is fixed between the bottom of the recess and the suba-equity pin. This spike tire is provided with a bias sedge ring and the coil spring is formed of a shape memory alloy whose martensitic transformation temperature is the friction temperature between the tire and the non-frozen road surface.

(f) Implementation of the present invention - Examples The present invention will be explained below with reference to drawings of embodiments.

1 is a storage box embedded in the recess 3 of the spiked tire 2. At the bottom of the box is a spiked tire pin 4.
The other end of the coil spring 5 having one end thereof is fixed via a fixed part 6.

Then, the coil spring 5fd - for example, T1Ni alloy (μm
The so-called shape memory alloy is made of ZnA (ZnA, 5 alloy), and its martensitic transformation temperature creates a metal structure at the friction temperature with the tire on a dry, non-frozen road surface.

≠ With this structure, when the spike tire bin is running on a frozen road surface, it protrudes as shown in Figure 1.

When driving on a non-frozen road surface, the vehicle becomes immersed as shown in Figure 2, and the reason for this will be explained in detail below.

In general, T1Ni alloy, which is a shape memory alloy, is known to exhibit a remarkable shape memory effect (5hape Memory Effect) accompanying the reverse transformation of the thermoelastic Mardenzit transformation. It is also applied to automatic window openers for greenhouses, etc.

It is also known that when the temperature of a shape memory alloy is below the alloy's transformation point (martensitic transformation temperature), the Young's modulus becomes less than 1/2 of the Young's modulus above the reverse transformation point (temperature at which it returns to the matrix). (In the case of T1Ni alloy, below the martensitic transformation temperature: approximately 4000 k1%/+++m2°; above the temperature at which it returns to the parent phase: approximately 10000 kg/wn2)
.

This means that by repeating heating and cooling, an element that reversibly deforms back and forth can be obtained.

The present invention applies the above two properties to the coil spring 5. On a non-frozen road surface in winter, the tire 2 generates heat due to the friction between the tire 2 and the road surface as soon as the vehicle starts running (for example, After about 5 minutes from starting at 40 km/h, the temperature of A-ya 2 rises by 30°C) The coil spring 5 reaches the transformation point or higher. As a result, the coil spring 5 contracts, and the spike tire pin 4 moves toward the surface of the tire 2 (second
figure).

When the tire comes into contact with the frozen road surface, the tire is rapidly cooled down, and the temperature of the coil spring 5 also drops.This time, the coil spring 5 expands and the spike tire pin 4 protrudes from the surface of the tire 2 (FIG. 1). In that case, the bicycle tire pins 4 come into contact with the collar 7 of the storage box 1, and the amount of protrusion is limited, and the amount of protrusion of all the pins 4 becomes equal.

Next, the embodiments shown in FIGS. 3 and 4 will be explained.
The difference from the embodiment shown in FIGS. 1 to 2 is that between the bottom of the storage gear 1 and the spike tire bin 4, the coil/ Ne5
It has a bias spring 8 inside it, and the elasticity of the spring 8 is.

The protruding spike tire pin 4 shown in Fig. 3 assists the movement of the coil gusset 5 so as to protrude against the weight of the vehicle body.

Therefore, it can fully demonstrate its effectiveness as a smooth tire on ice-span-like hard frozen road surfaces.

(g) Effects of the present invention As described above, the present invention provides a spike tire bin at the tip of a coil spring made of a so-called shape memory alloy.

By utilizing the change in shape of the coil spring due to the temperature difference between frozen and non-frozen road surfaces, the spike tire bin is configured to appear and retract from the tire surface, so when driving on a non-frozen road surface, that is, a dry road surface, the spike tire bin will be removed. automatically sinks into the surface of the tire, preventing dust pollution.

In addition to the coil spring, there is also a parallel bias spring.

This makes it possible to ensure the protrusion of the spike pin on a frozen road surface, thereby increasing the safety of running on a frozen road surface. can be provided.

[Brief explanation of the drawing]

The drawings are partial cross-sectional views of an embodiment of the present invention, and FIG. 1 is a diagram of driving conditions on a frozen road surface, FIG. 2 is a diagram of driving conditions on a non-frozen (dry) road surface, and FIG. 3 corresponds to FIG. 1. Another example, No. 4
The figure shows another embodiment corresponding to FIG. 2. In the figure, one end of the fixing part side, 8: Bias spring O-ring.

Claims (1)

[Claims] 1) A plurality of recesses are formed on the surface of the tire, and the other end of a coil spring having a tire pin at one end is fixed to the bottom of each recess, and the coil spring is made of martensite. A snow tire characterized by being formed from a shape memory alloy whose transformation temperature is the friction temperature between the tire and the non-frozen road surface. 2) A plurality of recesses are formed on the J-plane of the tire, and the other end of a coil spring having a spike tire pin at one end is fixed to the bottom of each recess, and a spike tire pin is attached at the bottom of the recess. A snow or bicycle tire, characterized in that a bias spring is provided, and the coil spring is made of a shape memory alloy whose martensitic transformation temperature matches the friction temperature between the tire and a non-frozen road surface.