JPS59171705A - Snow spike - Google Patents

Abstract

PURPOSE:To intend for prevention of road face damage and noise, and enhancement of hardness and durability of spikes by squeezing a trapezoidal cone of chip which is made of cemented carbide alloy or hardened steel, into the center hole of a shunk of glass fiber reinforced polycarbonate resin containing glass fiber at a specified ratio. CONSTITUTION:A trapezoidal cone of chip 1 is molded out of cemented carbide alloy or hardened steel. A shunk 3 having a hole 5 at the center thereof and a flange 4 is molded out of glass fiber reinforced polycarbonate resin which contains glass fiber at a ratio between 20 and 40 percent. A snow spike is formed by squeezing the chip 1 into the hole 5 of the shunk 3, whereby freezing of fear that the chip may come off, enhancing hardness and durability and attenuating damage on road and noise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a snow spike that reduces problems such as road damage and noise, and has sufficient strength and durability.

Snow spikes conventionally used in automobile tires for snowy roads have a shank made of low/medium carbon steel with a conical hole in the center, and a carbide shank with a trapezoidal part pressed into the hole of the shank. When manufacturing snow spikes with tips made of alloy or hardened steel, it is necessary to form a conical hole in the shank similar to the frustoconical part of the depth prior to press-fitting the tip. However, this method consists of first drilling a cylindrical hole in the unmanned shank after forging, and then finishing it into a conical shape with a taper reamer or taper 1 rill, which is technically difficult and requires many steps. It requires a process.

Furthermore, when a courier with snow spikes is driven on a road without snow, the JR road will be severely damaged and the noise will be loud. - Attempts have been made to use synthetic resin shanks to solve this problem and reduce weight, but conventionally known shanks are easily damaged during manufacturing and use, making them impractical. It was lacking in quality.

In view of these shortcomings of conventional products, the present inventors conducted extensive research and found that a glass fiber-reinforced polycarbonate resin with a glass fiber content of 20 to 40% satisfies the conditions required for the shank and prevents damage during chip press-fitting and use. We have discovered that there is no such thing and have arrived at the present invention.

That is, the present invention has a circular ↑ (G trapezoidal part) of a chip made of cemented carbide or hardened steel having a truncated conical part, and a glass fiber reinforced with a glass fiber content of 4.-20 to 40%, which has a hole in the center. A snow spike that is press-fitted into a hole in a polycarbonate resin shank.

The glass fiber reinforced polycarbonate 1-resin used in the present invention is a polyester of carbonic acid and divalent fuconol or glycol, typically a resin obtained by the reaction of hisphenol A and phosgene. It is a mixture of commercially available glass fibers, untreated or treated with 7-minosilane, etc., using a suitable coupling agent, and has a glass fiber content of 20 to 40%.

The chi knob used in the present invention is made of cemented carbide or hardened steel, and as shown in Fig. 1, at least the part that is press-fitted into the shank has a tapered circular M (L trapezoid) shape. The appropriate taper angle (the angle between the center line and the side surface, the same applies hereinafter) is 1 to 3 degrees.

The shape of the shank is, for example, as shown in FIG.
A hole 4 for press-fitting a chip is provided in the center of a cylindrical body 3, and a flange portion 5 for fixing to a tire is provided at the bottom. However, the shape shown in FIG. 2 is just one example, and various other shapes can be selected.

The hole in the center of the shank is for holding the chip by press-fitting the chip, and may be slightly smaller than the truncated conical portion of the chip, or may be cylindrical.

However, in order to firmly hold the tip to prevent it from falling off or caving in during use, and to reduce damage during use and press-fitting, it is necessary to The ratio of maximum Oi: and the ratio of taper angle are 0°90 to 0.98 times and 0.5 to 1.
Preferably, it has a 6ft circular shape as shown in Figure 2, which is 0x. The ratio of the shank diameter to the tip diameter in the body 3 is preferably 2.4 to 3.8 (i!i).

Also, the depth of the hole in the shank does not need to match the length of the press-fitted part of the tip; rather, it is better to make the head of the shank stick out the specified length and leave a space even when it is press-fitted. However, during use, as the shank wears, the tip gradually sinks into the shank with a moderately protruding shape, and the tip is always firmly held in the shank, which is preferable.

The snow spikes obtained according to the present invention can withstand use for an extremely long time without the tips falling off or caving in during use, and also cause very little damage to the road 1 and generation of noise.

The present invention will be explained in more detail with reference to Examples below.

Example 1 Using polycarpo-free b1 fat (manufactured by Mitsubishi Gas Chemical Co., Ltd., UBIUN GS 2020) obtained from bisphenol A and phosgene and containing 20% by weight of M containing glass fibers, as shown in FIG. The shank was manufactured by injection molding.

The total height of the shank, the length of the body, the length of the body, the diameter of the flange part, and the depth of the circular 11f-shaped hole at the center of the shank are the same as for 12 dragons, 10 parts, 7 rams, 10 parts, and 9 parts, respectively. , the maximum diameter of the hole in the center of the shank is 2.32 mm and 2.2 mm.
9i++, a combination of taper angles of 1°, 2° and 3°,
A total of 16 types of products were manufactured.

The total length of these six types of shank holes is -7.5mm.

A conical tip made of cemented carbide with a maximum diameter of 2.55 am and a taper angle of 2° was press-fitted in each case, leaving 1.0+u.

Regarding the six types of snow spikes obtained in this way, the tip sinking and tip push-out force when a load was applied to the tips were measured. The results were as shown in Table 1.

Example 2 Shank feed was made of polycarbonate resin with a glass fiber content of 30% (manufactured by Mitsubishi Gas Chemical Co., Ltd., Niepilon GS).
2030), the snow spike N of Example 1 was used.
o. Snow spikes manufactured in exactly the same manner as in 1.
126 per tire; 4: The driven tires were mounted on a regular passenger car (taxi) and a driving test was conducted in Sendai City from January 13th to March 7th, 1981. Result 8. i When running 12km (tire wear 2.8km), the spikes came off, and when the chips came out, there were no visible signs at all, 11.415km.
When running for m (tire wear 4.9 times), there were no spikes missing and only two chips missing.

On the other hand, when we conducted the same running test as above on snow spikes that were exactly the same as the above snow spikes with only the diameter of the trunk being 5.5 mm, we found that 4 snow spikes were removed after driving 8,112 km. fell, and all of the snakes had collapsed due to shank thinning.

[Brief explanation of drawings]

1, 2, and 3 are a front view showing an example of a tip, a center cut sectional view showing an example of a shank, and a center cut sectional view of a snow spike, respectively. 1 --- -Tip 2 --- Shank 3 ---Body 4 Flange portion 5--One hole No. 31

Claims (1)

[Claims] (11 yen & ff1 A frustoconical part of a tip made of cemented carbide or hardened steel with a trapezoidal part, and a glass fiber reinforced polycarbonate resin shank with a glass fiber content of 20 to 40% with a hole in the center. The taper angle of the truncated conical part of the snow spike (2) tip that is press-fitted into the hole is 1 to 3 degrees, and the shank hole before the tip is press-fitted is
Claim fl) wherein the ratio of the maximum diameter and the ratio of the taper angle to the truncated conical portion of the tip are respectively 0.90 to 0.98 times and 0.5 to 1.0 can tapered conical shape. Snow spikes listed