JPS6127709A - Spike pin for car tire - Google Patents

Abstract

PURPOSE:To prevent a pawl part to eat into a road surface in braking and thereby prevent any slipping of a tire from occuring by pressure-burrying a spike pin in the interior of a spike pin housing hole so as to be impossible to fall off with the aid of the pawl of the spike pin. CONSTITUTION:In order to permit a spike pin 1 to be rotatably held on a surface layer part Ta, a metal holder is burried in a tire. The holder 5 has an eating pawl 5b for eating into the surface layer part Ta, as well as a spherical head housing chamber 5a in a central portion thereof, said housing chamber 5a rotatably holding a head part 2 to construct a universal joint. A leg part 3 of the spike pin 1 forms a rotation preventing part 7 as well as an annular flat plane part 8 on an end surface thereof, an outer peripheral edge of said flat plane part 8 then forming an annular pawl part 6a. Then, the pin 1 is rotated by pressure caused by a rapid speed change to permit the pawl part 6a thereof to be projected from a ground contact surface Tb of the tire T, and further the pawl part 6a to eat into a road surface A for preventing the tire from slipping in braking.

Description

[Detailed description of the invention] The present invention relates to a spike bin for automobile tires.

In the operation of a car, slippage is an unavoidable phenomenon when starting and when braking (stopping).

This slip phenomenon occurs with sudden speed changes when starting from a stopped state or when braking during a running state. If the above-mentioned slip phenomenon occurs, for example, when the road surface is frozen or snowy, it can cause a major traffic accident.

In general, tires with various tread patterns such as circumferential ribs and lateral lugs formed on the ground contact surface of the tire are available as a means of suppressing the above-mentioned slip, but these are ineffective on frozen or snow-covered roads. be. Traditionally, spiked tires have been provided as a countermeasure against this problem, but while they are effective in preventing slips on frozen roads, they generate significant noise, damage to road surfaces, and generate dust, and these have recently become a problem for humans. It has been pointed out as a cause of pollution, causing health problems, and drastic countermeasures are desired.

Conventional spiked tires are made by driving a large number of pins into the surface layer of the tire, with the tips of the pins protruding from the tire's contact surface. The unreasonable result is that the road surface is chewed up, which causes pollution such as the generation of the above-mentioned dust and damage to the road surface.

Therefore, the present invention focuses on the fact that the above-mentioned slip phenomenon, which creates a dangerous situation, occurs when suddenly starting or braking, and only when these occur, spike bins are protruded from the ground contact surface of the tire, and the tips of the spike bins are To provide a spike pin for an automobile tire which effectively prevents pollution problems such as generation of noise and dust while performing a tire slip prevention function by having a claw part dig into the road surface. The purpose is to

Hereinafter, specific embodiments of the present invention will be described in detail based on the drawings.

The spike pin l according to the present invention has a surface layer Ta of a tire T.
A spherical head 2 that is regularly distributed over the entire spike pin 1 and that holds the spike pin 1 rotatably in the surface layer Ta, and a neck 2a of the head 2 that is integrally connected to the spike pin 1. It is provided with a leg portion 3 having a shape.

In order to rotatably hold the spike pin 1 in the surface layer Ta, a metal holder 5 is embedded in the surface layer Ta. The holder 5 has a single-stage or multi-layer annular biting claw 5b that bites into the surface layer Ta, and has a spherical head accommodating portion 5a opening toward the surface layer Ta in the center,
The head 2 is rotatably held in the head accommodating portion 5a, forming a universal joint. Therefore, the spike pin l is rotatable not only in the front-rear direction of the vehicle (tire circumferential direction) but also in the left-right direction (tire width direction). A grease accommodating part 5d is formed in the upper part of the head accommodating part 5a, and the grease accommodating part 5d is opened in the upper inner wall of the head accommodating part 5a. 5d and constantly supplies grease to the contact interface between the inner wall surface of the head accommodating portion 5a and the head 2, thereby smoothing rotation and preventing heat generation.

The holder 5 constituting the universal joint of the spike pin 1 is press-fitted into the deep inner part of the bottomed spike bottle accommodating holes 4 formed in a large number in the surface layer Ta so that the holder 5 cannot fall off with its biting claw 5b, and The spike pin l held by the holder 5 is allowed to rotate within a space 4a formed at the opening of the bottle receiving hole 4.

The leg portion 3 of the spike pin 1 is connected to the head portion 2 as described above.
The head 2 is integrally connected to the neck 2a of the head 2, and has a cup shape having its center on a line passing through the center of the head 2. The leg portion 3 forms a rotation prevention portion 7 at a portion of the outer peripheral surface of the cup that is continuous with the neck portion 2a, and an annular flat portion 8 defining a circular space 9 on the end surface thereof. An annular claw portion 6 is formed at the outer peripheral edge. The claw portion 6 is required to be arranged symmetrically at least with respect to the longitudinal rotational direction of the spike pin I. Therefore, the leg portion 3 may be divided into front and rear parts.

The annular plane part 8 is pressed against the road surface A by the pressure accompanying the sudden speed change, and the spike pin l is rotated by the frictional force with the road surface A, and the claw part 6 is pressed against the road surface A of the tire T.
The claw portion 6 is made to protrude from the road surface A so as to bite into the road surface A.

The annular plane portion 8 and the road surface A are in contact with each other or form a small gap during normal driving of the vehicle.

The leg portion 3 has the claw portion 6 protrude from the ground surface Tb at a forward rotation position and a rear rotation position bordering on a line perpendicular to the road surface A, and in a neutral position, the claw portion 6 is inserted into the void space 4a. Make it internal.

As described above, the spike pin 1 is in a normal state as shown in FIG. 2 in the normal state, and does not protrude from the outer peripheral surface of the tire T, does not engage with the road surface A, and is not provided with a spike pin. Allows the same running performance as regular tires.

First, the brake operation in the normal running state will be explained using FIG. 3A. When the brakes are applied while the vehicle is running, the tires T stop rotating in the direction of rotation (direction of arrow A), but the car tries to continue traveling in the direction of travel (direction of arrow A) due to inertia, so the tires T Surface layer T
Due to the pressure in the direction of the arrow X towards a, the annular plane part 8a of the front leg part 3a of the spike pin 1 is pressed against the road surface A, and while receiving the resistance of the front leg part 3a, it moves rearward about the head part 2 as a pivot point. and along with the tilting, the front leg 3
The claw portion 6a of the tire T protrudes from the ground surface Tb of the tire T and bites into the road surface A, and the rotation preventing portion 7b of the rear leg portion 3b on the opposite side to the traveling direction comes into contact with the lower surface 5e of the holder 5 and bites into the road surface A. Remains fully populated. This prevents slippage during braking while the vehicle is running. When the pressure is released by a complete stop and the tire T is restored, the spike pin 1 returns to the neutral position.

Next, the time of starting in a stopped state will be explained using FIG. 3B.

When the vehicle is suddenly started while the vehicle is stopped, slipping occurs, and due to the pressure in the direction of arrow Y on the surface layer Ta of the tire T, the annular flat portion 8b of the rear leg portion 3b of the spike pin 1 is pressed against the road surface A. It tilts rearward using the head 2 as a rotational fulcrum while receiving the resistance of the rear leg 3b, and as a result of this tilting, the claw 6b of the rear leg 3b protrudes from the ground contact surface Tb of the tire T and touches the road surface A. The rotation preventing portion 7a of the front leg portion 3a on the advancing direction side comes into contact with the lower surface 5e of the holder 5 to maintain the biting state. This prevents the occurrence of slipping when starting from a stopped state. Then, when the pressure is released during normal driving and the tire T is restored, the spike pin 1 returns to the neutral position.

As described above, the spike pin 1 according to the present invention has the cup-shaped leg portion 3, and thus has the same effect as described above also in the left and right directions with respect to the direction of travel of the automobile, that is, so-called sideslip.

The leg portion 3 in the embodiment is required to function during braking or starting during normal driving. Therefore, it is necessary that the leg portions 3 are arranged at least in the front and rear. In this case, the above spike bin 1
It may also be provided so that the whole can be rotated only in the front-rear direction.

As described above, the spike pin according to the present invention is stored in the surface layer of the tire during normal conditions such as when the vehicle is stopped or running, but when braking, etc., the spike pin moves away from the ground contact surface of the tire. The protruding claws bite into the road surface to prevent slipping. As a result, excessive slips and slides on frozen road surfaces are effectively prevented, traffic accidents caused by such slips are prevented, and safe driving is guaranteed. At the same time, the spike pins according to the present invention are housed within the surface layer of the tire during normal driving of the vehicle, and do not bite into the road surface or cause the so-called galling phenomenon, and eliminate noise generation in conventional spike tires.
Problems such as road surface damage and dust generation can be effectively resolved, and the cause of pollution can be fundamentally solved.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view showing details of the connection between the spike pin and the holder of the present invention; FIG. 2 is a cross-sectional view showing the spike pin held on a tire; Figure 3 is a cross-sectional view similar to Figure 2, showing the operating state of the spike pin. Figure A shows the operating state when braking, and Figure B shows the operating state when starting. It shows. l...spike pin, 2...head, 3...leg,
3a... Front leg portion, 3b... Rear leg portion, 5... Holder, 6... Claw portion, 6a... Front claw portion, 6b...
- Rear claw part, 8... Annular plane part, T... Tire, T
a...Tyre surface layer, Tb...tire contact surface, A...road surface. Figure 1 Figure 2 Figure 3 (A) Figure 3 (B)

Claims (1)

[Claims] The head is rotatably held on the surface of the tire with the head as a fulcrum in the direction of travel of the vehicle or substantially opposite to the direction of travel, and protrudes from the ground contact surface of the tire and bites into the road surface when rotated in each of the directions. A spike pin for an automobile tire, characterized in that the spike pin is provided with a leg part connected to the part.