JP2535343B2 - Tire anti-skid device spikes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spike for a tire anti-skid device that is attached to a tire anti-skid device to improve ground contact.

[Prior Art] As a vehicle tire anti-skid device used in a snowfall or the like, a metal chain mounted on the outer circumference of a tire is generally used. However, the metal chain has the drawbacks that it is complicated to mount, it makes a lot of noise when the vehicle is running, and that the chain hits the vehicle body during traveling and damages the vehicle body.

Therefore, a tire slip prevention device has been developed in which an elastic material such as rubber or urethane elastomer is molded into a shape in which a large number of frames are continuously formed to form a main body.

In this tire slip prevention device, as disclosed in Japanese Utility Model Laid-Open No. 60-38801, it has been proposed that a spike fitting made of a metal plate is attached to the main body to act as a spike. As a result, the grounding property is improved, and the durability of the main body is also improved, particularly when the frame body is wound around and attached to the intersection of the frame bodies.

Further, as disclosed in Japanese Utility Model Laid-Open No. 61-176005, there has been proposed a spike in which the above-mentioned spike metal fitting is provided with a chip projecting toward the road surface side, which further improves the grounding property. In addition, the durability of the spike fitting can be improved.

As the structure for locking the chip to the spike metal fitting, there are a structure in which the chip is locked to the spike metal fitting by welding means such as brazing, and a structure in which the chip is press-fitted and locked into a through hole formed in the spike metal fitting. Can be considered. The latter structure is suitable for mass production and does not require a welding material such as a braze, so that it can be manufactured at low cost.

FIG. 12 shows a structure in which the chip 10 is locked to the spike fitting 12 by press fitting. As shown in FIG. 12 (A), the spike fitting 12 is provided with a through hole 14 having a circular cross section, and the chip 10 is shaped like a truncated cone. Chip
As for the size of 10, the diameter D1 of the small diameter portion 10A is smaller than the hole diameter D2 of the through hole 14, and the diameter D3 of the large diameter portion 10B is larger than the hole diameter D2. As shown in FIG. 12 (B), the chip 10 is inserted into the through hole 14 from the small diameter portion 10A, and is pressed into the through hole 14 by pressing the large diameter portion 10B to expand the diameter of the through hole 14 and then press fit. (C)
The locking structure shown in FIG. With this locking structure, the small diameter part 10
A does not protrude from the through hole 14.

By the way, in the locking structure shown in FIG. 12 (C), the chip 10 may slip out of the spike fitting 12 or sink into the spike fitting 12 while the vehicle is traveling.
This is because the chip 10 has a weak locking force with respect to the spike metal fitting 12, and therefore the following measures can be considered.

As one of them, it is conceivable that the chip 10 has a conical shape with a larger taper angle and the diameter of the through hole 14 is increased. In this case, since the locking force increases and the taper angle increases, the effect of preventing the chip 10 from sinking is enhanced. However, on the contrary, the taper angle becomes large, so that the chip 10 becomes a structure that is easy to slip out, and the increased locking force is offset, and the effect of preventing the chip 10 from slipping out cannot be enhanced. In addition, chip 10
Since the wedge effect is reduced, the pressing force required for press-fitting is significantly larger than the obtained locking force.

Second, the shape of the chip 10 is not changed and the through hole 14
It is conceivable to reduce the hole diameter D2 and increase the diameter expansion amount of the through hole 14. However, in this case, if it is attempted to secure a sufficiently large diameter expansion amount, the hole diameter D2 becomes 10
The diameter becomes smaller than the diameter D1 of the small diameter portion 10A, and the initial guidance at the time of press fitting cannot be performed. For this reason, it becomes impossible to press-fit, or even if it is possible, there is a possibility that it will require a larger pressing force than the above and that the chip 10 and the spike metal fitting 12 will be deformed abnormally. Can not.

When the chip is locked to the spike fitting by brazing or the like, a bottomed hole is often formed in the spike fitting instead of the through hole. If the holes have bottoms even when they are locked by press fitting, there is no risk that the chip will sink, but in this case it is difficult to secure a sufficient embedding amount and it is difficult to obtain the required locking force, and each part High precision is required for dimensions.

[Problems to be Solved by the Invention] In view of the above, the present invention is directed to a spike metal fitting attached to the main body of a tire antiskid device made of an elastic material composed of a frame body, and a through hole formed in the spike metal fitting. In a spike for a tire anti-slip device having a chip that is press-fitted to and protrudes toward the road surface side, it is possible to prevent the chip from slipping out of the spike metal fitting and the chip falling into the spike metal fitting while the vehicle is traveling. At the same time, it is an object of the present invention to provide a spike for a tire anti-slip device that enables press-fitting work without requiring a significantly large press-fitting force as compared with the obtained chip locking force.

[Means for Solving the Problems] The present invention is directed to a spike fitting attached to the main body of a tire anti-slip device made of an elastic material composed of a frame body, and a press-fitting member to a through hole formed in the spike fitting. A chip for a tire anti-skid device having a chip that is stopped and projects toward the road surface side, wherein a conical portion is formed in the chip, and the small diameter portion side of the conical portion is directed toward the opposite road surface side of the spike fitting. It is characterized by protruding.

[Operation] In the present invention having the above-described configuration, since the press-fitting stroke of the chip is long, the diameter expansion amount of the through hole is increased without increasing the taper angle of the conical portion, and the locking force of the chip to the spike fitting is increased. Increase.

Also, since it is not necessary to increase the taper angle of the conical portion,
There is no need for a structure in which the chip easily slips out of the through hole or for a remarkably large pressing force as compared with the obtained locking force.

[Embodiment] FIG. 1 shows an embodiment of a spike for a tire antiskid device according to the present invention. In this embodiment, the chip 16 is formed by molding a hard metal or a material having excellent wear resistance such as ceramics into a truncated cone shape, and the spike metal fitting 18 is HR _c 3
It is formed by forming a steel plate having a plate thickness of about 2.5 to 3 mm made of mild steel having a hardness of about 0 to 40 into a rectangular shape and forming a through hole 20 penetrating in the plate thickness direction. As shown in FIG. 1A, in the chip 16, the diameter D1 of the small diameter portion 16A is smaller than the hole diameter D2 of the through hole 20, and the diameter D3 of the large diameter portion 16B is larger than the hole diameter D2. Further, the diameter D4 in the intermediate portion, which is separated from the small diameter portion by the length H toward the large diameter portion, is larger than the hole diameter D2.

When the chip 16 is locked to the spike fitting 18, as shown in FIG. 1B, the spike fitting 18 is placed on the pedestal 22 so that the surface facing the road surface becomes the upper surface. A recess 24 is formed in the cradle 22 so as to correspond to the through hole 20.
Next, the chip 16 is inserted into the through hole 20 from the small diameter portion 16A side. Since the diameter D1 of the small diameter portion 16A is smaller than the hole diameter D2, the tip end portion of the chip 16 on the insertion side is inserted without resistance to a portion having a diameter equal to the hole diameter D2.

From this state, the chip 16 is pressed from the large diameter portion 16B side and press-fitted into the through hole 20. The through hole 20 is expanded in diameter by the wedge effect of the force input to allow the chip 16 to move. Although it depends on the hardness relationship between the two, the chip 16 is also slightly reduced in diameter.

As shown in FIG. 1 (C), the chip 16 has a through hole 20.
When the tip of the insertion side protrudes from the spike fitting 18 by a length H, the press-fitting work is stopped, and the chip 16 is firmly locked to the spike fitting 18 by the shape restoring force of the spike fitting 18. In this state, the chip 16 is also projected from the spike fitting 18 on the large diameter portion 16B side.

In the above press-fitting work, since the chip 16 has a stroke amount substantially equal to the length of the spike fitting 18 plus the length H, the amount of expanding the through hole 20 is large and the spike fitting 18
However, the force for locking the chip 16 is also extremely large. Also, since it is not necessary to increase the taper angle of the chip 16,
The chip 16 does not have a structure that easily slips out of the through hole 20, and the pressure input does not significantly increase. As a result, the chip 16 can be prevented from slipping out and collapsing.

The material and hardness of the spike metal fitting 18, hole diameter D2, chip
It is preferable to determine the taper angle of 16 and the like so that the pressure input is 300 kg or more.

Further, in this embodiment, the amount of protrusion of the chip 16 to the road surface side is about ± 0.3 mm, and the amount of protrusion to the opposite road surface side is approximately equal to or twice the amount of protrusion to the road surface side.

The spike body according to the present embodiment is shown in FIGS. 2 and 3.
A tire anti-skid device attached to 28 is shown. The main body 28 is made of rubber, and reinforcing materials such as wires and cords are enclosed inside. As shown in FIG. 2, the plane shape of the main body 28 is a collective shape of frame bodies in which a substantially rhombic frame shape is used as a basic frame shape and a substantially triangular frame shape is combined with this. Mounting brackets 30, 32 are connected to this main body 28,
A rubber ring (not shown) is locked to the mounting bracket 30 to pull the main body 28 toward the tire axis on the outer surface of the tire,
A rope 34 is locked to the mounting bracket 32, and both ends of the rope 34 are connected to each other to pull the main body 28 toward the tire axis on the inner surface of the tire, thereby winding the main body 28 around the tire outer circumference. It is like this.

The pair of chips 16 are arranged asymmetrically at an unequal distance from the center of the spike fitting 18 in the longitudinal direction.

The spikes are arranged in a row in the longitudinal direction of the main body 28 with the spike metal fitting 18 attached to the central portion of the main body 28 in the direction orthogonal to the longitudinal direction. This attachment is made by caulking the spike metal fitting 18 into an elliptical shape as shown in FIG. 3, and the main body 28 accommodates the spike metal fitting 18 as shown in FIGS. 4 and 5. A rectangular recess 36 for making the surface of the spike metal fitting 18 substantially flush with the surface of the main body 28, a pair of cylindrical recesses 38 for accommodating the projections of the chip 16, and the spike metal fitting 18 for the main body 28. And a pair of through holes 40 for wrapping around the back surface of the.

These spikes are arranged in a line along the longitudinal direction of the main body 28, but adjacent spikes are not
Are arranged 180 ° apart from each other around the central portion in the longitudinal direction. This allows the chips 16 adjacent to each other in the tire circumferential direction.
The chips 16 are arranged such that they are separated from each other in the tire width direction without overlapping in the tire width direction.
Since they are arranged in rows, the anti-slip performance is improved.

In this tire non-slip device, the spikes are mainly
The chip 16 protruding from the surface of the ground improves the ground contact on the ice and snow road. Further, even when the vehicle runs on a paved road from which snow has been removed, the surfaces of the chip 16 and the main body 28 serve as a grounding surface, and the spike metal fitting 18 hardly touches the ground.

The tire anti-skid device with spikes of this embodiment and the tire anti-slip device with spikes shown in FIG.
As a result of a running experiment, the chip 10 slipped out and collapsed after traveling about 100 Km in the one shown in FIG. 12 (C), but in this embodiment, the chip 16 slipped out and collapsed even after traveling 150 Km. Did not occur.

Further, in the tire anti-skid device to which the spike of the present embodiment is attached, since the concave portion 38 for accommodating the projecting portion of the chip 16 is formed in the main body 28, the main body 28 is formed by the chip 16.
28 was not damaged. Further, since the concave portion 38 is formed, the main body 28 does not push the chip 16 back in the counter-press-fitting direction.

In the spike of the above embodiment, the pair of chips 16 are asymmetrically arranged with respect to the spike metal fitting 18 in the state of being attached to the main body 28, but it is of course possible to arrange them symmetrically. Chip 16 to a piece of spike metal fittings 18
There is no limit to the number of arrangements.

In the spike of the above embodiment, the spike metal fitting 18 is embedded in the main body 28, and the main body 28 is pierced through the main body 28.
Although it was attached to the main body 28 so as to wrap around the back side of 28, as shown in FIG. 6, it was attached to the main body 28 by winding it around the outer periphery of the intersection of the frame bodies forming the main body 28. Is also possible.

Further, in the above-mentioned embodiment, the longitudinal ends of the spike fittings 18 are made to face each other on the back surface side of the main body 28, but as shown in FIG. Is. In this case, since the longitudinal end of the spike fitting 18 does not come into contact with the tire, there is an advantage that the tire is unlikely to be damaged by the longitudinal end of the spike fitting 18.

When the chip 16 is arranged on the spike metal fitting 18 as shown in FIG. 7, the guide groove 42 of the chip 16 is provided as shown in FIG.
By using the clincher 44 as a pedestal in which the ridge is formed, by pressing the driver 46 in the direction indicated by the arrow in FIG. 9, the spike metal fitting 18 can be bent into an elliptical shape and attached to the main body 28. .

Further, in the above embodiment, the chip 16 has a truncated cone shape, but since only the portion that engages with the through hole 20 of the spike fitting 18 is conical, the grounding portion protruding from the spike fitting 18 is not necessary. It may have a cylindrical shape as shown in FIG. 10 or may have a truncated cone shape with an inverse taper to the portion engaging with the through hole 20 as shown in FIG.

Further, although the conical portion is formed on the chip 16 in the above embodiment, the present invention is not limited to this, and a pyramidal portion such as a triangular pyramid or a quadrangular pyramid may be formed.

[Advantages of the Invention] As described above, in the tire anti-skid device spike according to the present invention, it is possible to prevent the chip from slipping out of the spike metal fitting and the chip sinking into the spike metal fitting while the vehicle is traveling, and to obtain the advantages. There is an effect that the press-fitting work can be performed without requiring a significantly large press-fitting force as compared with the locking force of the chip.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing an embodiment of a spike for a tire anti-skid device according to the present invention, FIG. 2 is a plan view of a tire anti-skid device having a spike according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a sectional view corresponding to FIG. 3 showing the tire anti-skid device body before the spike is attached, and FIG. 5 is a VV line in FIG. FIG. 6 is a plan view taken in the direction of an arrow, FIG. 6 is a cross-sectional view corresponding to FIG. 3 showing another mode of attaching the spikes to the tire anti-skid device body,
FIG. 8 is a sectional view corresponding to FIG. 3 showing another arrangement mode of the spike fittings on the tire anti-skid device body, and FIG. 8 is used when attaching the spikes shown in FIG. 7 to the tire anti-skid device body. FIG. 9 is a perspective view of the clincher, FIG. 9 is a front view for explaining the work when the spike is attached to the tire anti-skid device body using the clincher shown in FIG. 8, and FIGS. 10 and 11 are other shapes of the chip. FIG. 12 is a side view showing an example, and FIG. 12 is a process explanatory view showing a conventional example. 16 …… chip, 18 …… spike metal fittings, 20 …… through hole, 28
...... The main body of the anti-skid device.

Claims (1)

(57) [Claims] 1. A spike metal fitting attached to a main body of a tire anti-skid device made of an elastic material composed of a set of frames, and a press fitting engagement with a through hole formed in the spike metal fitting so as to project toward a road surface side. A tire for anti-skid device having a chip, wherein the chip is formed with a conical portion, and the small diameter portion side of the conical portion projects toward the opposite road surface side of the spike fitting. Spike for anti-slip device.