JP3037216U - Tire spike - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a technique that is lightweight, easily maintains the edge effect even when it is worn, and can keep the material cost and the manufacturing cost low. A shank (2) and an upper surface (2) of the shank (2).
Carbide tip 3 embedded in A by exposing the upper end surface 3A
In the tire spike 1 consisting of
Indicates that the concave portion 7 having the bottom 7A is the upper end surface 3A of the carbide tip 3.
This carbide tip 3 is formed downward from the
Is press-fitted and fixed to the shank 2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tire spike, and more particularly to a tire spike including a shank and a cemented carbide tip embedded in the shank.

[0002]

[Prior art]

 As is well known, a tire spike composed of a shank and a cemented carbide tip having an upper end surface exposed and embedded in the upper surface of the shank is used. Previously, the cemented carbide chip was entirely solid and could be pressed into the shank. However, the above-mentioned cemented carbide tip has a problem in that the edge portion becomes flat due to wear during running, the edge effect is easily lost, and in addition, since it is solid, the material cost is high and the weight is large. Therefore, a macaroni-type cemented carbide tip having a hollow portion formed through from the upper end to the lower end has been conventionally considered.

[0003]

[Problems to be solved by the device]

 According to the above macaroni-type carbide tip, even when it wears, it has edge wear with an edge, the edge effect continues, and since it has a hollow part, it is possible to save material and reduce material cost. there were. However, the work of this cemented carbide chip is difficult because it has to be attached to the shank, the production efficiency is poor, and the manufacturing cost is high.

Therefore, an object of the present invention is to provide a technique which is light in weight, can easily maintain the edge effect even when worn, and can further reduce the material cost and the manufacturing cost.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has the following technical means. That is, this will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments. The present invention comprises a shank 2 and a cemented carbide tip 3 which is embedded in the upper surface 2A of the shank 2 with an upper end surface 3A exposed. In the tire spike 1, in the cemented carbide tip 3, a recess 7 having a bottom 7A is formed downward from the upper end surface 3A of the cemented carbide tip 3, and the cemented carbide tip 3 is opposed to the shank 2. It is a tire spike characterized by being press-fitted and fixed.

Another characteristic part is that the shank 2 is connected to the bottom surface 3B of the press-fitted cemented carbide tip 3 and has an air hole 6 communicating with the bottom surface 2B of the shank 2. Characterize.

[0007]

[Embodiment of the invention]

 Next, embodiments of the invention will be described based on examples with reference to the drawings. 1 and 2 show a tire spike 1 according to the first embodiment. The tire spike 1 includes a shank 2 and a carbide tip 3.

The shank 2 is made of iron and has a columnar shape with a flange-shaped leg portion 4 at the bottom. A chip press-fitting groove 5 into which the cemented carbide chip 3 is press-fitted is formed in an upper portion of the shank 2. The tip press-fitting groove 5 is a groove depressed in a circular shape when viewed from the upper surface 2A of the shank 2, and a wall around the tip press-fitting groove 5 is a peripheral wall 8. The shank 2 has an air hole 6 formed therein. The air hole 6 is a through hole that is formed in the center axis of the shank 2 and extends in the up-down direction. One side of the air hole 6 is opened to the chip press-fitting groove 5 and the other side is opened to the bottom surface 2B of the shank 2. . The shank 2 may be made of a material other than iron.

Next, the cemented carbide tip 3 is made of cemented carbide such as tungsten carbide-cobalt, and the side surface 3C has a circular cross-section cemented carbide tip 3 from the upper end surface 3A to the bottom surface 3B. It has an inclined surface with a small diameter toward it. Then, the cemented carbide tip 3 has a recess 7 formed therein. The concave portion 7 is a groove that is recessed in a circular shape when viewed from the upper end surface 3A of the cemented carbide chip 3, and has a bottom 7A 1 without penetrating to the bottom surface 3B of the cemented carbide chip 3.

The cemented carbide tip 3 is press-fitted and fixed in the tip press-fitting groove 5 of the shank 2. At this time, the bottom surface 3B of the cemented carbide tip 3 and the bottom surface 5A of the tip press-fitting groove 5 of the shank 2 are pressed against each other. When the cemented carbide chip 3 is press-fitted and fixed to the shank 2, the upper end surface 3A of the cemented carbide tip 3 is exposed on the upper surface 2A of the shank 2. At this time, the air hole 6 of the shank 2 is connected to the bottom surface 3B of the above-mentioned carbide tip 3. In other words, if the pressure when the cemented carbide chip 3 is press-fitted into the shank 2 is high, the gas pressure contained in the internal space formed by the shank 2 and the cemented carbide tip 3 is conventionally high, and when the vehicle is traveling at high speeds. There was a risk that the cemented carbide tip 3 would jump out of the shank 2, but the formation of the air hole 6 releases the gas pressure inside the shank 2 and prevents the cemented carbide tip 3 from jumping out. It is what is done.

Next, a second embodiment will be described with reference to FIGS. 3 and 4. In this example, substantially the same parts as those in the first embodiment described above are omitted, and only different parts will be described. That is, in the shank 2 of this example, the air hole 6 is not formed. The side surface 3C of the cemented carbide tip 3 is formed as an inclined surface such that the cemented carbide tip 3 having a circular cross section has a large diameter from the upper end surface 3A to the bottom surface 3B. In the shank 2, the peripheral wall 8 around the tip press-fitting groove 5 is caulked after the cemented carbide chip 3 is press-fitted.

The tire spike 1 is used in a state of being attached and fixed to a resin chain which is generally used at present in medium and long distances. Even when the carbide tip 3 is worn due to this use, the edge is always displayed by the concave portion 7, and it is easy to maintain the edge effect of reliably catching snow and ice, and the weight is lighter than that of the solid case. And the amount of expensive cemented carbide used is small. Further, since the shank 2 can be fixed by press-fitting work, the work is easy.

In the above embodiment, the cylindrical shank 2 is described as an example, but other shapes may be used. Moreover, although the above-mentioned example of the cemented carbide tip 3 having a circular cross section is described, other shapes may be used. Further, although the concave portion 7 of the cemented carbide tip 3 is described as an example of a circular shape when viewed from the upper end surface 3A, other shapes may be used.

[0014]

[Effect of the invention]

 As described in detail above, according to the first aspect of the present invention, since the concave portion having the bottom is formed in the cemented carbide tip, the concave portion always exhibits an edge even when it is worn due to use, so that the edge effect can be obtained. It is easier to maintain, lighter in weight than the solid case, and the amount of material used is small, making it easy to keep the material cost low. Further, since it can be fixed to the shank by press-fitting work, the work is simple, the production efficiency is good, and the manufacturing cost is easily kept low.

According to the second aspect, by forming the air hole in the shank, the gas pressure in the internal space formed between the cemented carbide tip and the shank when the cemented carbide pin is press-fitted is released, It is possible to prevent the carbide tip from protruding from the shank.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional side view of a cemented carbide tip of a tire spike according to a first embodiment of the present invention.

FIG. 2 is a side cross-sectional side view of the tire spike according to the first embodiment of the present invention.

FIG. 3 is a side cross-sectional side view of a cemented carbide tip of a tire spike according to a second embodiment of the present invention.

FIG. 4 is a side sectional side view of a tire spike shown in a second embodiment of the present invention.

[Explanation of symbols]

 1 Tire spike 2 Shank 2A Shank top surface 2B Shank bottom surface 3 Carbide tip 3A Carbide tip top surface 3B Carbide tip bottom surface 3C Carbide tip side surface 4 Leg part 5 Tip press fitting groove 5A Tip press fitting groove bottom surface 6 Air hole 7 Recess 7A Recess bottom 8 Surrounding wall

Claims (2)

[Utility model registration claims] 1. A shank 2 and an upper surface 2 of the shank 2.
Carbide tip 3 embedded in A by exposing the upper end surface 3A
In the tire spike 1 consisting of the above-mentioned cemented carbide tip 3, the concave portion 7 having the bottom 7A is formed downward from the upper end surface 3A of the cemented carbide tip 3,
A tire spike in which the carbide tip 3 is press-fitted and fixed to the shank 2. 2. The shank 2 is connected to the bottom surface 3B of the press-fitted cemented carbide tip 3, and the bottom surface 2 of the shank 2 is formed.
The tire spike according to claim 1, wherein an air hole 6 communicating with B is formed.