JPS62191205A - Snow surface pressure sensing spike for automobile snow tire - Google Patents

Abstract

PURPOSE:To aim at enhancing the safety and at preventing dust pollution, by providing a snow surface pressure sensor within a groove in the tread of a tire in order to detect the pressure of the snow surface during the groove forms a locus of pressurized snow so that the spike pins are projected. CONSTITUTION:During running of a snow covered road, when a locus of pressurized snow is initiated to be clearly formed by a tread groove 4, the pressure of snow surface is detected by snow surface pressure detecting sensors 9, and the thus detected pressure is transmitted through a sensor piece 8 to the outer periphery of a Belleville spring 6 with therefore reverses its curved surface about the circumference of a narrow section 12. Thereby, a spike pin 7 is projected form the tread surface 2 by the Belleville spring to exhibit a spike function. Further, during running on a road surface with no show, the spike pin is pressed into by the road surface to reverse the Belleville spring 6 and is sunk into the tire which is therefore turned into a normal tire. With this arrangement it is possible to aim at enhancing the safety of the tire, and at preventing dust pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION 3 Title of the Invention According to the present invention, when a car passes over a snow-covered road, the snow compaction miracle of its tire tread grooves remains firmly on the snow surface. A snow surface pressure sensor provided in the tread groove detects the snow surface pressure when this snow compaction trajectory is formed, and the spike pin is made to protrude above the tire's outer circumferential ground contact surface.

Next, the snow surface pressure sensing sensor spike for automobile tires of the present invention will be explained with reference to the drawings. As shown in the cross-sectional view of FIG. (3) are provided radially with respect to the rotational axis of the tire (1), and extend to adjacent tread grooves (4) centered on each of these pin holes (3).
A cavity (5) that looks like two hyperbolas intersecting on one plane are simultaneously rotated is provided within the wall thickness of , and each of these cavities (5) also has a hyperbolic cross section. Disc springs (6) are provided, and spike pins (7) fixed to the center of each disc spring (6) move in and out of each pin hole (3).

Additionally, sensor pieces (8) are provided between several locations on the outer periphery of each disk spring (6) and the opposing tread groove (4), both of which radiate with respect to the rotational axis of the tire (1). The head of each sensor piece (8) is also held so as to lift a part of the wall thickness of the tread groove (4) to form a snow surface pressure sensor (9).

In addition, the capsule (10) having a concentrically narrowed narrow part (12) in the middle secures the space of the cavity part (5) from the vehicle load, and the outer periphery of each capsule (10) has each sensor piece ( 8) is provided with a guide tube (11) for guiding.

In addition, FIG. 3 is a reduced front view of each disc spring (6) which fixes each spike pin (7) in the center part.

When a car equipped with the snow surface pressure sensing sensor spike for automobile tires of the present invention configured as described above approaches a snow-covered road as described above and the tread grooves (4) begin to form a compacted snow trajectory on the snow surface, Each snow surface pressure sensor (9) in the tread groove (4) that senses the snow surface pressure transmits that pressure to each disc spring (6) within the tire (1) thickness through each sensor piece (8). The pressure is applied to the outer periphery of each of the disc springs (6), which reverses its curved surface around the circumference of each narrow portion (12) as a fulcrum, reaching the state shown in FIG.

Next, as shown in the cross-sectional view of Fig. 2, each disk spring (6) whose curved surface has been reversed by applying pressure to its outer circumferential portion, each spike pin (7) fixed at its center is attached to the tire ( 1
) can be made to protrude above the outer periphery of the ground contact surface to ensure safe driving of the vehicle on snow-covered roads. Now each spike pin (
7) is also subject to snow surface pressure, so each narrow part (12
) The circumference diameter must be set with this in mind.

Also, when the car passes through a snow-covered area on the road and reaches a snow-free area, the spike pins (7) protruding from the outer circumferential contact surface of the tire (1) are moved to each plate on the road surface such as asphalt or concrete. The curved surface of the spring (6) is similarly reversed again using the circumference of each narrow portion (12) as a fulcrum to return to the state shown in Fig.
) The vehicle can be retracted into the outer ground contact surface and drive normally on snow-free roads.

As described above, the snow surface pressure sensing sensor spike for automobile tires of the present invention has the following features: the fulcrum of the curved surface reversal of each disc spring (6) is provided considerably inside the circumference of each narrow portion (12), and each sensor piece (8) is held so as to lift a part of the wall thickness of the tread groove (4), and the reaction force is always applied to the head, and the reaction force is always applied to the head of the tread groove (4). Because the snow surface pressure is transmitted to the outer periphery of each disc spring (6), which is close to a nearly straight line and is easiest to reverse, each snow surface pressure sensor (9) can detect a slight snow surface pressure. can also react sensitively.

On the other hand, since each spike pin (7) protruding on the outer circumferential contact surface of the tire (1) is fixed and protruding on the back surface of the narrowest curved surface within the circumference of each narrow part (12),
It has the effect that it cannot be retracted unless it is subjected to a strong pressure several times or more than the above, that is, a strong pressure received from the road surface such as asphalt or concrete, and can sufficiently exhibit its spike function even on ice and snow surfaces.

Also, no matter how fast you drive on a snow-free road with the spike pin (7) in Figure 1 retracted, each narrow section (12
) Each spike pin (7) fixed within the narrowest curved surface within the circumference has the effect that it cannot be protruded by centrifugal force or the like.

Now, in addition to the above, from a hydraulic point of view, for example, in the structure shown in Figs. A snow surface pressure sensing sensor (9) is installed by filling the interior with liquid so as to lift it up, and a partition wall is installed near the circumference of the narrow part (12) to divide the interior into two chambers, with the area within the partition wall being the pin chamber and the rest. This is referred to as a sensor chamber, and there are two types of valves in the partition wall, strong and weak.It means a valve that only operates under strong pressure and a valve that operates even under weak pressure. If the strong valve is designed to allow liquid to flow from the pin chamber to the sensor chamber, and the weak valve is to allow liquid to flow from the sensor chamber to the pin chamber, the tread groove (4) added to the snow surface pressure sensor (9) as described above. ) When the snow surface pressure is formed, a part of the liquid in the sensor chamber flows into the pin chamber through the weak valve, and in this case, the liquid in the sensor chamber does not flow back from the pin chamber because it is a strong valve. When the spike pin (7) protrudes above the outer periphery of the tire (1) and receives strong pressure from the snowy road surface, part of the liquid in the pin chamber is sent back to the sensor chamber via the force valve. In this case, the weak valve opening into the pin chamber is closed. A part of the wall thickness of the tread groove (4) is lifted again to form a snow surface pressure sensor (9).

In this way, the same results as those described above can be obtained even with a hydraulic configuration.

However, in both of the above and below configurations, one is in close contact with the spike pin (7) and the other with the pin hole (3) at a point slightly below the grounding part of the spike pin (7) and the pin hole (3), and the water gets wet. - It is desirable to use a bellows rubber structure or soft rubber structure that prevents the intrusion of dust and the like and allows for some degree of expansion and contraction.

The snow surface pressure sensing sensor spike for automobile tires of the present invention will automatically move each spike pin (7) to the tire whenever there is snow on the road, regardless of whether the driver is careful or not. (1) The spike pins (7) are protruded above the outer tread surface of the tire (1) to ensure safe driving of the vehicle, and whenever the snow on the road is cleared, each spike pin (7) is automatically retracted into the outer tread surface of the tire (1). Since it can run, it can improve the safety of automobile traffic in snowy and cold regions, and also eliminate the dust pollution in urban areas caused by conventional spiked tires, damage to roads, and the spraying of large amounts of antifreeze. It can be improved.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing the state of the snow surface pressure sensing sensor spike for automobile tires of the present invention before and after the spike pin is protruded, respectively, and FIG. 3 is a scaled-down view of the disk spring used therein. It is a front view. (1) Tire, (2) Tread, (3) Pin hole, (4) Tread groove, (5) Cavity, (6
)...Disc spring, (7)...Spike pin, (8)...Sensor piece, (9)...Snow surface pressure sensor, (10
)... Capsule, (11)... Guide tube, (12)...
Narrow area.

Claims (1)

[Claims] A snow surface pressure sensor installed in the groove of an automobile tire tread detects the snow surface pressure when the tread groove forms a compacted snow trajectory on a snow-covered road, and causes a spike pin to protrude above the tire's outer periphery contact surface. Snow surface pressure sensing sensor spikes for automobile tires.