JPS60124510A - Spike shank - Google Patents

Abstract

PURPOSE:To prevent a road surface from damaging, by forming a shank, whose inside is of hollow in type, in a way of letting it to store its form so as to cause its side wall to become a bellows form with a form memory alloy, while contracting the said shank when its temperature rises upon driving on a general road surface. CONSTITUTION:A lot of shanks are embedded in a tread part of a spike tire. Each shank 1 is made up in a hollow cylindrical form with a form memory alloy, making it store its form in memory so as to cause its side wall to become a contracted form as in being bellowslike at a form restoring temperature in advance. Likewise, a hard tip 2 is installed in one end of the grounding surface side of each shank 1 while a flange 3 in the other end at the axle side, respectively, and such a spring 5 that pushingly stretches each shank 1 is housed inside the shank 1 when temperature is below the form restoring one, whereby it is made up into the required spike. And, in time of driving on a frozen road surface, an antiskid effect is secured with action of the tip 2 on the shank 1 under the state of being extended, and in time of drying on a general road surface, the shank 1 is contracted, thus any damage to the road surface is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spike shank for a spiked tire.

Conventional spiked tires have the disadvantage of abrading the road surface and generating dust. This is an unavoidable problem with conventional spiked tires, which drive with their spikes protruding all the time.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a movable spike shank that can be protruded when anti-slip is required and retracted when unnecessary.

This invention will be explained with reference to the drawings showing one of the embodiments.

Figure 1 is a cross-sectional view of the spike, which has a hollow shank 1 made of a shape memory alloy, and is shaped so that the side wall of the shank 1 contracts into a bellows shape when the temperature is above the shape recovery temperature. A hard tip 2 is provided at one end of the shank 1 on the contact surface side, a flange 3 is provided at the other end on the axle side, and a spring 5 is provided inside the shank 1 so that when the temperature is below the shape recovery temperature, the shank 1 A spike is formed so that it can be stretched out to take the state shown in FIG. 2, and this spike is pushed onto the tread material 4 of the tire.

When the road surface is frozen, the temperature near the spike is relatively low, and at this time, the shank 1 cools down to below the shape recovery temperature.
If it is iIj, the shank 1 has a certain degree of plasticity and is stretched by the spring 5 as shown in FIG. 2, thereby protruding the tip 2 onto the tread surface to provide an anti-slip effect.

In addition, when the temperature near the spike rises and exceeds the shape recovery temperature, the shank 1 returns to the memorized shape, so the first
Store the chip 2 while compressing the spring 5 as shown in the figure.

In order for the shank 1 to expand and contract, an increase in temperature near "spiky" and the composition of the shape memory alloy are involved. As an example, when using a CLI-AI-Ni alloy, the shape recovery temperature is approximately Although it is close to 20 degrees Celsius (=1), the temperature and road surface conditions when the temperature near the spikes reaches around 20 degrees Celsius do not cause freezing, and therefore there is usually no need to use spikes.

In this way, by selecting an alloy whose shape recovery temperature is in a temperature range that does not require spikes and constructing the shank, the tip can be protruded in cold temperatures that may cause freezing, and yet it will not freeze. Under certain conditions, if a heater 8 for storing the chip is provided and electricity is supplied to this heater 8, the temperature of the shank 1 can be humidified by the heater 8 to a temperature above the shape recovery temperature when anti-slip is not required. Then, the shank 1 can be contracted into a memorized shape as shown in FIG. 1, and the tip 2 can be stored therein. According to the method of heating the shank 1 with the electric heater 8 in this way, it is possible to store the tip 2 even when the temperature near the spike 7 is lower than the shape recovery temperature. The spikes 7 can be moved in and out as desired, and the composition of the alloy constituting the shank 1 can be relatively freely selected.

FIG. 4 is a cross-sectional view of the spike. The hollow shank 1 is made of a shape memory alloy, and the side wall of the shank 1 does not assume a relatively straight shape when the temperature is above the shape recovery temperature. The shape is memorized, a hard tip 2 is provided at one end of the shank 1 on the contact surface side, and a flange 3 is provided on the other end of the shank 1 on the axle side. A contraction spring 6 is provided inside the shank 1 so that the shank can be compressed to a state as shown in FIG. Configure.

When such a spike is cooled below the shape recovery temperature, the shank 1 becomes plastic, and the shank 1 is stretched by the spring 6 and assumes a contracted shape as shown in FIG.

When straightening this shank 1, when the shank 1 is heated to a temperature higher than the shape recovery temperature using the electric heater 8, the shank 1 recovers to a relatively straightened shape as shown in Fig. 4, and the tip 2 is protruded to prevent it from slipping. obtain the effect of

Furthermore, when storing the tip 2, if the electricity supply to the electric heater 8 is cut off, the tire and spikes will be cooled by the road surface and the outside air, and the shank 1 will also be cooled below its shape recovery temperature and contracted by the spring 6 as described above. Then, store the chip 2 again as shown in FIG.

With this type of spike, as mentioned above, the chip automatically protrudes when the temperature of shank 1 exceeds the shape recovery temperature, so in order to make the chip appear or disappear at will, the temperature of shank 1 must be below the shape recovery temperature. must be used in The shape recovery temperature at this time is determined by the composition of the alloy constituting the shank 1; for example, Tt
According to the -Ni alloy, the tip begins to protrude when the shank 1 is heated to approximately 80°C. Normally, the temperature of shank 1 is 80℃ during the winter period when spikes are required.
It is extremely rare for a vehicle to reach this level, and if this alloy is used, the tip will not inadvertently protrude as the temperature of the shank 1 increases during driving when the spike is stored.

In addition, many local governments regulate the period of use of spiked tires by ordinance, and in that case, the period of use is limited to cold weather, so the above problem is considered to be of no practical problem from a legal regulatory perspective. .

In any case, the shape recovery temperature of the alloy constituting the shank 1 is set to be higher than the temperature during running of the tire.

It is better to make the spikes as shown in Figures 4 and 5 more easily contracted by the spring 6, so when constructing the memory shape, it is better to make the spikes as shown in Figure 4 somewhat bellows-like as shown in Figure 5. In this way, when the spike is stored, the contraction of the shank 1 is performed smoothly.

When constructing a spike using the shank 1 described in claim 1, the spring 5 has the effect of elongating the shank 1, but instead of this spring 5, rubber, plastic, etc. A similar effect can be obtained by filling with an elastic body, gas, or liquid.

In the shank 1 according to claim 1 or 2, the shank expands and contracts in a bellows manner by providing the slit 9 from the substantially ground contact surface side toward the axle axis direction as shown in FIG. Make it even easier. The spacing and shape of the slits 9 are appropriately designed to allow smooth expansion and contraction of the shank.

Since this shank expands and contracts the entire length of the shank 1 by bending and stretching the side wall, the shape of this side wall is not limited to the bellows shape shown in the drawing, but the shape is memorized so that it swells outward. The same effect can be obtained by forming it into an arbitrary shape, such as by recessing the shape, or by memorizing the shape so that it is concave inward.

There are various electric heaters 8 for heating the shank 1, but in addition to the conventional electric heating wire heater, a heat generating sheet made of plastic synthetic resin may be used, and should be selected appropriately taking into consideration the structure of the tire. Or design. When installing an electric heater, consider the performance of the tire and the unique structure of #4, and set the crotch B1 as appropriate, but it is recommended to place the heater along the breaker or to configure the breaker with the heater. It's okay.

Instead of an electric heater, the same effect 7 can be obtained by disposing an induction heating device on the vehicle body side such as a tire house or on a tire wheel and heating the shank by induction.

As mentioned above, it is possible to change the configuration of this optical device without departing from the spirit thereof, and therefore, it is possible to implement it with other configurations within the technical scope of the claims of the above embodiments. Needless to say, it is a thing.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view, not showing the state in which the chip is housed. FIG. 2 is a longitudinal sectional view showing a state in which the chip is protruded. FIG. 3 is a longitudinal sectional view showing the state in which the electric heater is arranged. FIG. 4 is a vertical cross-sectional view showing a state in which the chip is protruded. FIG. 5 is a longitudinal sectional view showing a state in which the chip is housed. FIG. 6 is a side view showing a state in which slits are provided. 1...Shank, 2...Tip, 3...Flange, 4...Tread material 5...Spring, 6...Spring, 7...Spike, 8...
・Electric heater, 9...slit. Patent applicant Kinya Nakamura

Claims (1)

[Claims] 1 A hollow shank 1 is made of a shape memory alloy, and the shape is memorized so that the side wall of the shank forms a convex part or four parts when viewed from a cross section along the central axis direction of the shank 1. The shank of the covering spike is characterized in that the shank 1 can be expanded and contracted in a bellows manner, and the shank recovers to a memorized shape when heated above a shape recovery temperature. 2. The Silenc according to claim 1, characterized in that the side wall has a memorized shape so that it has a relatively straight shape when viewed in cross section. 3. The shank according to claim 1 or 2, characterized in that the slit 9 is provided from the substantially ground contact surface side toward the axle shaft side.