JPH0262402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spike pin for an automobile tire.

In driving a car, slipping is an unavoidable phenomenon when starting and braking (stopping).

This slip phenomenon occurs in conjunction with a sudden change in speed 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.

Generally, as a means to suppress the above slip,
Tires have been provided in which various tort patterns such as circumferential ribs and lateral lugs are formed on the ground contact surface of the tire, but these are ineffective on frozen or snowy roads. 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 come to be pointed out that it is the cause of pollution, causing health problems, and drastic countermeasures are desired.

Conventional spiked tires have many pins driven 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 above-mentioned dust generation and damage to the road surface.

Therefore, the present invention focuses on the fact that the above-mentioned slip phenomenon, which creates a dangerous condition, occurs when a sudden start or sudden braking occurs, and the invention aims to remove the spike pin, which rotates freely only when such occurrences occur, from the ground contact surface of the tire. It protrudes in any direction depending on the direction in which force is applied, and its tip claws bite into the road surface, preventing tire slippage while effectively preventing pollution problems such as noise and dust generation. It is an object of the present invention to provide a spike pin for an automobile tire that prevents damage to the vehicle.

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

The spike pin 1 according to the present invention is regularly distributed over the entire surface layer Ta of the tire T, and has a spherical head 2 that holds the entire spike pin 1 rotatably in the surface layer Ta. and legs 3 integrally connected to the neck 2a of the head 2.

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-stage annular biting claw 5 that bites into the surface layer Ta.
b, and has a spherical head accommodating part 5a opening toward the surface layer Ta in the center, and the head 2 is rotatably held in the head accommodating part 5a, forming a universal joint. are doing. Therefore, the spike pin 1 can be freely rotated not only in the front-rear direction of the vehicle (tire circumferential direction) but also in the left-right direction (tire width direction). At the upper part of the head accommodating part 5a, there is a grease accommodating part 5 that opens on the upper inner wall of the head accommodating part 5a.
Grease is supplied from the grease injection hole 5c formed in the upper surface of the holder 5 to the grease storage portion 5d.
and the inner wall surface of the head accommodating portion 5a and the head 2.
Grease is constantly supplied to the contact interface to ensure smooth rotation and prevent heat generation.

A holder 5 constituting a universal joint for the spike pin 1 is inserted into the innermost part of a plurality of bottomed spike pin accommodating holes 4 formed in the surface layer Ta.
The spike pin 1 held by the holder 5 is press-fitted into the hole 4a formed in the opening of the spike pin receiving hole 4 and allowed to rotate within the space 4a formed at the opening of the spike pin receiving hole 4.

As described above, the leg portion 3 of the spike pin 1 is integrally connected to the neck portion 2a of the head portion 2, and has a cup shape having its center on a line passing through the center of the head portion 2. The leg portion 3 forms a rotation prevention portion 7 at a portion of the outer peripheral surface of the cup connected to the neck portion 2a, and an annular flat portion 8 defining a circular space 9 is formed on the end surface thereof. An annular claw portion 6 at the outer periphery of the
is formed.

The annular plane part 8 is pressed against the road surface A by the pressure caused by the rapid speed change, and the spike pin 1 is rotated by the frictional force with the road surface A, and the claw part 6 is pressed against the road surface A by the frictional force with the road surface A. The claw portion 6 protrudes from the
The aim is to cut into 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 freely rotates in any direction on the circumference centered on a line perpendicular to the road surface A, and causes the claw portion 6 to protrude from the ground surface Tb at each rotational position, and in the neutral position, the claw portion 6 projects from the ground surface Tb. The portion 6 is made to reside within the space 4a.

As described above, the spike pin 1 is in a normal state as shown in FIG. 2 under normal conditions, 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 because the car tries to continue traveling in the direction of travel (direction of arrow B) due to inertia, the rotation of the tires T stops. Due to the pressure in the direction of the arrow X on the surface layer Ta, 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, the head part 2
is used as a rotational fulcrum and tilts rearward, and with the tilting, the claw portion 6a of the front leg 3a protrudes from the ground contact surface Tb of the tire T and bites into the road surface A, and the rear leg on the opposite side to the direction of travel The rotation preventing portion 7b of the holder 5 contacts the lower surface 5e of the holder 5 to maintain the biting state. This prevents slippage during braking while driving. 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 a car suddenly starts when it is stopped, a slip occurs, and the arrow Y towards the surface layer Ta of the tire T
Due to the pressure in the direction, the rear leg 3 of the spike pin 1
The annular flat portion 8b of the rear leg 3b tilts backward using the head 2 as a rotational fulcrum while being pressed against the road surface A and receiving the resistance of the rear leg 3b, and as it tilts upward, the claw of the rear leg 3b The part 6b is the ground contact surface of the tire T.
It protrudes from Tb and bites into the road surface A, and the rotation preventing portion 7a of the front leg 3a on the traveling direction side comes into contact with the lower surface 5e of the holder 5 to maintain the biting state. This prevents the occurrence of slips 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 following features:
Since the leg portion 3 has a cup shape, the same effect as described above is achieved also in the left and right directions with respect to the direction of travel of the automobile, that is, so-called sideslip.

That is, the spike pin 1 can freely rotate in any direction depending on the direction in which the slip force is applied while obtaining the sliding rotation of a ball joint, and the annular claw portion 6 is exposed when it rotates in any direction. This biting state is maintained by the rotation prevention part of the spike pin 1 coming into contact with the holder 5, and a good slip prevention effect can be obtained in any direction. .

As described above, the spike pin according to the present invention is
Under normal conditions, such as when the car is stopped or running, the legs are stored within the surface layer of the tire, but when braking, etc., the legs protrude from the tire's contact surface, and the annular claws dig into the road surface, causing slippage. prevent the occurrence of This biting effect on the road surface can be obtained in any direction where the slip force acts.
This effect is also ensured by the fact that the rotation prevention part of the spike pin abuts against the holder. As a result, excessive slips and slides on frozen road surfaces are effectively prevented, traffic accidents caused by slips, etc. are prevented, and safe driving is ensured. At the same time, the spike pin according to the present invention is housed within the surface layer of the tire during normal driving of the vehicle, and does not dig into the road surface or cause the so-called galling phenomenon, and eliminates noise generation in conventional spike tires. Problems such as road surface damage and dust generation can be effectively resolved, and the cause of pollution generation can be fundamentally solved. Further, in the present invention, by embedding a holder and holding the spike pin in the holder via a ball joint, the mechanism for rotating in the free direction can be properly formed, and the spike pin can be rotated in either direction. By making contact with the holder, the biting state is ensured and the desired effect can be achieved.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view showing details of how the spike pin of the present invention is connected to a holder; FIG. 2 is a cross-sectional view showing the spike pin held in a tire; Fig. 3 is a diagram showing the operating state of the spike pin with a cross-sectional view similar to Fig. 2; Fig. A shows the operating state when braking, and Fig. B shows the operating state when starting. It shows. 1... Spike pin, 2... Head, 3... Leg, 3a... Front leg, 3b... Back leg, 5...
...Holder, 6...Claw part, 6a...Front claw part, 6
b... Rear claw part, 8... Annular plane part, T... Tire, Ta... Surface layer of tire, Tb... Ground contact surface of tire, A... Road surface.

Claims (1)

[Claims] 1. A spike pin holder is buried deep inside a bottomed spike pin accommodating hole formed in the tire surface layer, and the spike pin is freely rotatably held in the spike pin holder via a spherical joint. The pin has an annular claw portion that bites into the road surface when the pin rotates freely, and the spike pin has a rotation prevention portion that comes into contact with the holder during free rotation to maintain the biting state of the annular claw portion against the road surface. A spike pin for an automobile tire, comprising: