JP2545272B2 - Fastening device for anti-skid tires for automobiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fastening device for an anti-skid tire of an automobile.

(Prior Art) Conventionally, as a fastening device for attaching a slip stopper to a tire, a round rubber band 2 is hooked on a band hook 3 of a chain or net-shaped slip stopper 1 as shown in FIG. Is common.

Further, this rubber band 2 has a structure in which two to three rubber bands 2 are successively hooked on the hook 3 instead of one.

Since a plurality of rubber bands 2 are used, the tension of the rubber band 2 that can be easily locked to the hook 3 by a human hand is limited, and the tension of one rubber band 2 is not enough. When the tire 4 rotates, it is not possible to prevent the anti-slip 1 from rising from the tire 4 surface due to the centrifugal force acting on the anti-slip 1. Therefore, a plurality of tensions that overcome the centrifugal force generated when traveling on a general road at normal speed are used. This is because it has been obtained to use the rubber band 2 of the book.

(Problems to be Solved by the Invention) In particular, in the case of non-slip net type non-slip, which is becoming the mainstream in recent years, floating due to centrifugal force of the anti-slip 1 from the tire 4 surface is caused by a decrease in durability or bulging. This is an important point in the design of the anti-slip 1 because it leads to damage or the like due to contact with the inner surface of the fender.

However, on the other hand, the number of rubber bands 2 used has increased in order to prevent lifting, so the work of locking one rubber band 2 at a time to a number of hooks 3 It can be said that this is an obstacle to the further widespread use of this type of anti-skid device, which has been reviewed for the abolition of spiked tires, which causes a large amount of time and physical effort to be removed.

Specific numerical values of the centrifugal force generated in the anti-skid of automobile tires and the tension generated in the rubber band 2 will be described below by using calculation formulas.

In general, the slip stopper 1 has a rubber band 2 locked to 12 hooks 3 as shown in FIG.

When a tire 4 having a turning radius r [m] is fitted with a slip stopper 1 having a weight W [Kgf] and the tire 4 rotates at a peripheral speed v [m / s], each hook 3 of the slip stopper 1 is fitted with F [Kgf]. Centrifugal force works. Since the centrifugal force acting on the slip stopper 1 is held by the rubber band 2 that is locked to the hook 3, the rubber band 2 has T [Kg
f]

As the tire peripheral speed increases, the centrifugal force also increases and the rubber band 2
When the tension set above is exceeded, the slip stopper 1 floats up from the tire 4.

Assuming that the centrifugal force generated in the anti-slip 1 is equally received by the front and back fastening parts of the tire 4 in half, the 12 anti-slip hooks 3 at the front-side fastening part are The centrifugal force applied to each hook 3 is calculated as supporting half. The relationship of forces in this case is shown in FIG.

The centrifugal force F and the tension T are calculated from "Mirror's theorem". The relationship between the vehicle speed V [Km / h] and the tire circumferential speed v [m / s] is v = 0.278V [m / s] (Equation 3) The total weight of one non-slip non-slip wheel Is the tire size
It is about 1.5 Kgf for 135R12 and about 2.2 Kgf for 215 / 60R15. 2
Take each value as an example for 15 / 60R15.

General turning radius r of 215 / 60R15 tire is r = 0.321
[M]. The value of the centrifugal force F when the vehicle speed V is 20 to 100 [Km / h] is as shown in Table 1 according to [Equation 1].

The value of the tension T acting on the rubber band 2 at this time is as shown in Table 2 according to [Equation 2].

The rubber band 2 has a round cross-section with a diameter of 0.73 [cm], the rubber material is 37.5 [%], and the modulus value is 17 [Kgf / cm].
² ] is used with an elongation of 37.5 [%], the total initial tension of 22.0 [Kgf] is applied when the three rubber bands 2 are locked to the hook 3. It will be.

 The relationship between the speed V and the tension T is shown in FIG.

As is clear from FIG. 13, the tension T of the rubber band is superior to the centrifugal force generated up to 70 [km / h] per hour,
If the speed exceeds 70 [Km / h], the centrifugal force will be greater than the tension of the rubber band, and the anti-slip will stand out from the tire. At 90 [Km / h], the slip resistance is 3.7 [c
m] also rises in the calculation.

Due to the characteristics of the rubber material, the fastening method using a rubber band has many disadvantages such as a decrease in modulus during repeated pulling and a change in modulus at ambient temperature. The best way to prevent the swelling of the fastening part due to centrifugal force is to use a cord or wire that does not cause elongation, but pull the cord or wire by hand and tighten it as specified in the initial installation state. It is impossible to adjust the diameter because there is eccentricity to the non-slip tire and there is a catch on the tire tread. For this reason, some parts have a structure such that the loosened part is pulled with a rubber band etc. after the fastening diameter is set so that it can be pulled by hand. Has not been achieved.

An object of the present invention is to provide a fastening device for an automobile tire slip preventing the above-mentioned drawbacks of the rubber band system and the fastening system using a string or wire.

(Means for Solving the Problem) The fastening device for a vehicle tire slip stopper according to the present invention is movable by centrifugal force generated when the tire is rotated, which is arranged at a position eccentric from the center of the tire when the slip stopper is mounted on the tire. It is characterized by comprising a weight and a non-slip fastener which is connected to the weight and whose fastening force is increased by the movement of the weight.

(Operation) According to the fastening device for an automobile tire slip of the present invention, it is possible to eliminate the time and physical effort of locking the rubber band to the hook, and it is possible to install it regardless of age or gender. Instead, tension is generated by centrifugal force according to the number of rotations of the tire, and the tire slip can be always fastened to the tire with a fastening force optimal for the traveling speed at that time.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1 to FIG. 3, four non-metal slip stoppers 1 which divide the outer circumference of the tire 4 into four are used, and these are connected and fixed by one end of a bifurcated hook 3A. At the same time, one ends of the hooks 3 are fixed to the extension ends of the anti-skid 1 that extend in the tire lateral direction.

Also, the other ends of the hooks 3 and 3A are less likely to stretch,
The band 2A such as a string or a wire whose surface is coated with a resin or the like is locked so as to easily slide in the 3A.

As shown in FIG. 4, the hook 3 engaged with the band 2A
To prevent the gaps between the hook 3 and the hook 3 and between the hook 3 and the hook 3A from deviating from each other, the movement preventing tube 7 is movably covered on the outer circumference of the band 2A portion located between them, and when the specified fastening diameter is reached. The tube end touches each hook and hooks 3,3A
It is preferred that the absolute spacing of is maintained.

As shown in FIGS. 1, 4 and 5, the band 2A is connected and locked to the other end of the hooks 3 and 3A other than the part A, and at the part A, both ends of the band 2A are connected to the hook 3A. Extend from the space between the two ends through the tire center O to the B section facing the A section,
When the slip stopper 1 is attached, both ends of the band 2A are fixed to one end of a weight 6 for generating a centrifugal force at a position beyond the tire center O toward the side B, and the other end of the weight 6 has a tension such as rubber or a spring. One end of the band 8 is fixed, and the other end of the tension band 8 is locked to the band 2A engaged with the other end of the hook 3A of the B part through a hook or the like.

The weight 6 is guided by a guide 5 as shown in FIGS. 1 and 6 so that it can move around the tire center O by centrifugal force.
It is preferable that the both ends of the guide 5 are slidably held by means of the tension bands 9 such as rubber or springs, and are connected to the other ends of the hooks 3A of the A and B parts.

Further, as shown in FIG. 6, the guide 5 has a restriction hole C for restricting the slide position of the weight 6 on the guide 5.
It is provided so as to extend in the radial direction from the center of the tire so that the fastening part does not become looser than the set value even if the tire stops at any position, and the centrifugal force by the weight 6 is always applied in the direction in which the band 2A is fastened. Preferably.

A method for mounting the anti-skid by the fastening device for the anti-skid of an automobile tire according to the present invention will be described below.

First, the slip stopper 1 is temporarily fixed to the tire 4. After that, the tire is rotated about 1/4 turn to connect the back side fastening part, but conventionally the round rubber band for fastening at the time of temporary fastening is locked to several hooks and the round rubber for temporary fastening is fixed after turning the tire 1/4 turn. Although the work of removing the band was involved, according to the present invention, the whole of the slip stopper 1 can be evenly squeezed by the band 2A that is movable in the hooks 3 and 3A so that the tire 4 as shown in FIG.
Non-slip 1 can be temporarily fixed in a very short time.

Thereafter, as shown in FIG. 8, the portion A of each slip stopper 1 is connected by the hook 3A, and the guide 5 is locked to the hooks 3A of the portions A and B.

After that, hook the band 2A whose end is connected to the weight 6 on the forked part of the hook 3A of the A part and pull it by hand to pull it toward the B part. The end of the tension band 8 is the forked part of the hook 3A of the B part. The band 2A stopped between the parts is locked.

The centrifugal force generated by the weight 6 during actual traveling is as follows when obtained from the conceptual diagram of FIG.

The tire size used for calculation is the same as the above, 215/60.
R15.

The position of the weight 6 is regulated by the regulation hole C of the guide 5, and is 1 [m] from the tire center O. The peripheral speed of the tire circumference is v
When [m / s] is set, the peripheral speed of the weight 6 is And the centrifugal force generated at that time is the tension T [Kg
f]. The generated tension T is calculated from [Equation 1], and the weight 6 is W '[Kgf]. In the initial state of fastening, tension band 8 is replaced with conventional round rubber band 1
Band 2 in hook 3 and 3A when a tension of 7 [Kgf] is applied
If A is tightened without slack and the radius of rotation of the weight 6 from the tire center O at that time is set to l = 0.1 [m], as apparent from Table-2, the speed V is 40 [km / hour].
Within h], the fastening diameter does not expand further, and the tension due to the centrifugal force of the weight 6 is added to it.

Further, when the maximum moving distance of the weight 6 is 5 [cm], the turning radius of the weight 6 at the time of maximum movement is l = 0.15 [m], and at that time, the fastening portion is tightened further 10 [cm] from the initial state. By providing a slack of 10 [cm] between the initial fastening and the maximum fastening, the work of initial fastening is reduced.

The tension value generated by the weight 6 at the vehicle speed V = 20 to 100 [Km / h] is defined as the weight W '= 0.5 [Kgf] of the weight 6 [Equation 4].
Table 3 shows the results obtained by using.

The actual tension applied to the fastening portion exceeds the required tension value obtained in Table-2 because the initial tension 7 [Kgf] by the tension band 8 is added to each value in Table-3. Also, due to the tension generated by centrifugal force, the turning radius of the weight 6 increases to l = 0.15 [m], so that when V = 70 [Km / h], the tension by the weight 6 alone causes T = 28.1 [Kgf]. Since it reaches, sufficient tension can be obtained even if the loss due to friction at the hooks 3 and 3A is taken into consideration.

In the present invention, the weight 6 rotates about the tire rotation center O to generate a centrifugal force. In another embodiment of the present invention, as shown in FIG.
Separated and fixed using the wheel mounting hole on the car,
The weight 6 can be moved around the tire center O.

(Effects of the Invention) As described above, according to the present invention, it is excellent in attachment and can reduce time and physical effort as much as possible, and at the same time, prevents the tire from being lifted up compared to the conventional non-slip tire due to centrifugal force. Therefore, the optimum fastening force can always be generated according to the traveling speed, and it is possible to obtain the effect of improving the durability. In addition, the weight for generating tension is 500 [grf], which is a range that does not hinder handling.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fastening device for an anti-skid vehicle tire according to the present invention, FIGS. 2 and 3 are explanatory views of respective fastening portion hooks, and FIG. 4 is an explanatory view of a hook movement preventing tube. FIG. 7 is an explanatory view of a weight of the present invention, FIG. 6 is an explanatory view of a guide, FIG. 7 is an explanatory view of a state of temporarily preventing slipping on a tire by a device of the present invention, and FIG. FIG. 9 is a conceptual explanatory view of tension generation by the device of the present invention, FIG. 10 is an explanatory view of another embodiment of the present invention, FIG. 11 is an explanatory view of a conventional fastening device for a tire slip stopper for an automobile, and FIG. Is an explanatory view of the relationship of the force applied to the conventional fastening device for a tire slip for an automobile,
FIG. 13 is a diagram showing the relationship between the speed and the tension applied to the fastening portion. 1 ... Skidproof, 2, ... Rubber band, 2A ... Band or wire band, 3,3A ... Hook, 4 ... Tire, 5 ...
… Guide, 6 …… weight, 7 …… movement prevention tube, 8,
9 ... tension band such as rubber or spring, C ... regulation hole.

Claims (2)

(57) [Claims] 1. A weight, which is arranged at a position eccentric from the center of the tire when the anti-slip is attached to the tire and is movable by a centrifugal force generated when the tire rotates, and a tightening force connected to the weight by the movement of the weight. A non-slip fastening device for an automobile tire, comprising: 2. The fastening tool is a fastening band for pulling the anti-skid in a radial direction of a tire, and the weight is a part of the fastening band and when the anti-slip is attached to a tire. It is inserted between the other part of the tightening band that faces a part of the tightening band through the center of the tire, and the weight is displaced from the center of the tire to the other part of the tightening band. The fastening device for an automobile tire slip according to claim 1.