JPH04321407A - Anti-skid device for tire - Google Patents

Abstract

PURPOSE:To enhance the durability of an anti-skid device for a tire, by reducing abrasion and damage of an engaging member for engaging an anti-skid member to a coupling member. CONSTITUTION:In an anti-skid device A in which two opposite ends parts of an anti-skid member 1 bridging across the tread surface of a tire are engaged and coupled to a pair of coupling members by means of metal engaging members 2, 2, one or both of an engaging core 1 which is the anti-skid member side engaging member and a connector 10 which is the coupling member 2 side engaging member 2 is formed of synthetic resin 7 at the peripheral surface thereof in at least a part where both members make contact with each other.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-slip device for tires used when an automobile is running on a snowy or icy road.

0002

[Prior Art] In recent years, anti-slip devices for tires used to prevent slips when driving on snow-covered roads, etc., have been designed to be easy to attach tire chains to tires, to be lightweight, and to have anti-vibration properties. For the purpose of improvement, the anti-slip body that acts as a grounding material that is stretched along the tread surface between both sides of the tire is made of rubber or synthetic resin material reinforced with cords.
A ladder-like structure has emerged in which these anti-slip bodies are connected by a pair of connecting members such as chains or ropes that go around the tire side part in a circular manner and are arranged in parallel at a predetermined interval.

[0003] In such anti-slip devices for tires, various proposals have been made for connection structures between the above-mentioned anti-slip body and the connecting member, and the present applicant also proposes to replace worn-damaged anti-slip bodies. In order to facilitate connection and removal at the time, we have proposed a connection structure between a non-slip body and a connection member that can be engaged and detached.

[0004] In conventional anti-slip devices, the engaging member for removably engaging and connecting the anti-slip body to the connecting member is made of metal such as iron or steel (for example, general structural rolled steel). It's normal.

[0005] In the connection structure between the anti-slip body and the connecting member, the tire is deformed when the vehicle is running with the anti-slip body attached to the tire, and vibrations and shocks are generated depending on the road conditions. The engaging member on the anti-slip body side and the engaging member on the connecting member side are slidably connected to each other so that the connecting portion of the connecting member can follow the aforementioned deformation, vibration, etc. It has become.

[0006] For example, the applicant previously proposed patent application No. 1-
In the connection structure of No. 179378, an engagement core is provided through the end of the non-slip body as an engagement member on the non-slip body side, and a hook of a connector, which is an engagement member on the coupling member side, is attached to the protruding end of this engagement core. The parts are slidably engaged and connected.

[0007]

[Problems to be Solved by the Invention] In the above-mentioned connection structure, since the engaging core and the hook portion of the connector are slidably engaged and connected, the above-mentioned Friction occurs when a strong force repeatedly acts on the engagement portion of the engagement core and the hook portion as they slide into contact.Moreover, in the case of the above structure, since the engagement position does not change much, the friction occurs locally. Become.

For this reason, when both engaging members are made of the same metal material such as iron or steel, the engaging portions are subject to severe wear due to friction, and wear out and damage faster than the anti-slip body made of rubber material or the like. However, the above-mentioned engaging core is damaged and becomes unusable in a relatively short period of time, which poses a problem in its durability.

[0009] In view of the above, the present invention has been made as a result of various experimental studies and studies, and has been developed by forming one or both of the engaging members using a synthetic resin on the surface of the contact portion with the other. This is what led to the problem being resolved.

0010

[Means for Solving the Problems] That is, the present invention provides an engagement member for a pair of connecting members that can go around annularly in a tire side portion at both ends of a non-slip body that is spanned along a tire tread surface. In order to solve the above-mentioned problem in a tire skid tool formed by detachably engaging and connecting, one or both of the engaging member on the side of the skid stopper and the engaging member on the connecting member side, It is characterized in that at least the outer circumferential surface of the contact portion between the two is formed of a synthetic resin excluding ultra-high molecular weight polyethylene.

[0011] In the above, it is preferable that one or both of the engaging members has a structure in which the outer periphery of a metal core is covered with the synthetic resin.

0012

[Operation] According to the present invention, when the engaging member on the anti-slip body side and the engaging member on the connecting member side are slidably connected, the surface of at least one of the engaging members is made of the above-mentioned synthetic resin, and has better lubricating properties than metals, has a lower coefficient of friction, and has good sliding properties, has an extremely low wear rate due to friction with metals, and has excellent wear resistance.

Further, in the case where the outer periphery of the metal core is covered with the synthetic resin, the inner metal core compensates for the decrease in strength due to increase in frictional heat, etc., and maintains sufficient strength against bending deformation and the like.

[0014]

EXAMPLE Next, one embodiment of the present invention will be explained with reference to the drawings.

In the figure, (A) shows an example of the anti-slip device for a tire according to the present invention, and as shown in FIG. A pair of connecting members (2) (2) consisting of a chain, a rope, etc., in which a required number of anti-slip bodies (1) shaped like the above are arranged at appropriate intervals, and both ends of each can be looped around the side of the tire. It is connected to a ladder-like structure. The drawings show a case where the connecting members (2) (2) are ropes.

As shown in FIG. 2, the anti-slip body (1) has a central region (1) having approximately the same length as the tread width of the tire (T).
3) and the following end regions (4) (4). Rod-shaped engagement cores (5) are provided at the ends of both end regions, respectively, passing through the width direction. Engagement core (5) (5)
A reinforcing cord layer having flexibility and high tensile strength is embedded in a rubber material layer having excellent wear resistance.

[0017] As a means for connecting both ends of the anti-slip body (1) and the connecting member (2), a steel material or the like is used to engage and connect both protruding ends (5a) of the engaging core (5). A metal connector (10) is provided on the coupling member (2).

The connector (10) is bent into a substantially U-shape, and the bent end portion thereof is folded back into a hook shape so that it can freely engage with the protruding end portion (5a) of the engagement core (5). It is set in. Both rod portions (12) continuously extending downward from the hook-shaped engaging portion (11) are coupled to predetermined positions of the connecting member (2). In this connection structure, the engagement core (5) and the connector (10) serve as engagement members that are slidably connected to each other.

These engaging cores (5) and connectors (1
The diameter of 0) can be arbitrarily determined in consideration of the strength of the anti-slip tool (A) in use, etc., but is usually about 6 to 12 mm.

In the embodiment shown in FIGS. 1 and 2, the engaging core (5), which is one of the engaging members, is attached to the outer periphery of the core (6) made of metal such as steel as shown in FIG. It is composed of a synthetic resin (7) other than ultra-high molecular weight polyethylene wrapped therein. The synthetic resin (7) may be simply wrapped so as to form at least the outer peripheral surface of the contact area with the connector (10), which is the other engaging member (see FIG. 5).

Depending on the type of synthetic resin, the entire engaging core (5) may be made of synthetic resin (7) as shown in FIG. 6, but from the viewpoint of bending strength etc. It is desirable to cover the core (6) with the synthetic resin (7).

In order to cover the outer periphery of the core (6) with the synthetic resin (7), in addition to applying it by means such as coating or insert molding, the core (6) may be coated with a separately formed cylinder.
It can also be coated on. In either case, the thickness is preferably 0.1 mm or more.

As another embodiment, contrary to the above, the engaging core (5) is made of metal such as steel, and the connector (10) that is engaged with this is made of a metal core such as steel. (13
), at least the surface of the contact area with the engaging core (5), for example, the upper half circumferential surface on the contact area side as shown in FIG. 7, or the entire circumferential surface is covered with the synthetic resin (7) as described above. It can also be implemented.

Furthermore, the connector (10) whose outer circumferential surface is made of synthetic resin as described above, and the engaging core (7) whose outer circumferential surface at least in the contact area is made of synthetic resin (7) as shown in FIGS. 5) can be used in combination with

As the synthetic resin (7), any synthetic resin other than ultra-high molecular weight polyethylene can be used, such as polyethylene other than ultra-high molecular weight polyethylene, polyolefin resins such as polypropylene, polystyrene resins, and acrylics such as acrylonitrile. resin, polycarbonate resin, ABS resin, epoxy resin, nylon 6, nylon 6-6, nylon 11, nylon 12,
Polyamide resins such as nylon 6-10, phenolic resins, fluororesins, and other resins can be used. Furthermore, examples include reinforced plastics (FRP) in which reinforcing materials such as glass wool and carbon fiber are mixed with these resins.
Moreover, these can be used alone or in combination. When used for the engagement core (5), a synthetic resin having heat resistance that can withstand the temperature during vulcanization of the anti-slip body (1) is particularly preferred.

As described above, the engagement core (5) is the engagement member on the side of the anti-slip body (1) that is slidably engaged and connected;
If the surface of at least one contact area with the connector (10) on the side of the connecting member (2) is formed of synthetic resin, the synthetic resin has better lubricity than metal, has a smaller coefficient of friction, and is easier to slide. , it also has the ability to protect the friction partner. Therefore, almost no wear due to friction occurs, and even though they are slidably engaged, they can be used for a long period of time without fear of wear and tear.

In order to confirm the above effect, 16 anti-slip bodies (1) are engaged and connected to the connecting members (2) (2) in FIG.
In the anti-slip tool (A) having the structure shown in , the engaging cores (5) and connectors (10) having the configurations of Examples 1 to 3 and comparative examples below are arranged in four anti-slip bodies, A driving test was conducted as follows.

[0028] The driving test was carried out for 1500km on a 10 ton truck equipped with the above-mentioned anti-slip device based on the JATM method.
The average amount of wear of the engagement core (5) during running was measured. The results were as shown in Table 1 below. The tire size of the truck is 10,00R20, and the tire internal pressure is 7.25kg.
/cm2. Further, the diameter of the engaging core (5) was 7 mm, and the diameter of the connector was 8 mm.

(Example 1) The engaging core has the structure shown in FIG. 5, the core is made of general structural rolled steel (SS41), the outer peripheral surface is covered with nylon 12, and the connector is made of steel (SS41).
S41).

(Example 2) The engaging core had the structure shown in FIG. 4, the core was made of steel (SS41), the outer peripheral surface was covered with nylon 12, and the connector was made of steel (SS41). thing.

(Embodiment 3) The engaging core is made of steel material (SS41), and the core rod in the structure of FIG. 7 is made of steel material (SS41).
SS41) and the outer circumferential surface is covered with nylon 12.

(Comparative Example) Both the engagement core and the connector were made of general structural rolled steel (SS41).

[0033]

[Table 1]

As is clear from the above, in the case of the comparative example using the conventional metal engagement member, the amount of wear increased as the load increased, and it became unusable in a relatively short period of time, but the present invention In the case of the example, almost no wear occurred, and the wear was reduced to 1/10 or less of that of the comparative example, and it was found that the example was particularly effective as an engagement and connection structure.

[0035] In the case of the connection structure shown in Fig. 1, the dimension (L)
(S) (K) is set to S<L<K, and the non-slip body (1
) is made detachable from the connector (10), but it is also possible to have an engagement connection structure that does not easily engage and disengage.

Furthermore, as described above, the hook portion (11) of the connector (10) connected to the connecting member (2) is connected to the engaging core (5) provided through the end of the anti-slip body (1). Not only in the case of a structure in which the engaging member on the anti-slip body side and the engaging member on the connecting member side are engaged and connected, the same method as described above can be applied. It can be implemented by

[0037]

As described above, according to the present invention, in the engagement connection portion between the engagement member on the anti-slip body side and the engagement member on the connection member side, the surface of the contact portion of at least one of the engagement members Since it is made of synthetic resin, it has good lubricity, good sliding, and excellent wear resistance, as well as excellent protection of the friction partner, and the sliding engagement part due to engagement is localized. Even if a large load is applied, the engaging part will not be damaged by wear and tear, and the mating member will also be prevented from wearing out, so there is no risk of damage to the point where the anti-slip body is destroyed. It has excellent durability and can be used successfully for a long period of time.

In addition, in the case of a metal core whose outer periphery is covered with the synthetic resin, the internal metal core compensates for the decrease in strength due to increase in frictional heat, etc., and maintains sufficient strength against bending deformation, etc. It can be used more safely.

[Brief explanation of drawings]

FIG. 1 is a partial front view showing the engagement and connection structure of the anti-slip body and the connecting member by the engaging member in the anti-slip tool of the present invention.

FIG. 2 is a side view of the same as above.

FIG. 3 is a plan view showing an example of a non-slip device.

FIG. 4 is a perspective view showing an engaging core whose entire circumferential surface is covered with synthetic resin.

FIG. 5 is a perspective view showing an engaging core in which the surface of the contact portion is covered with synthetic resin.

FIG. 6 is a perspective view showing an engaging core made entirely of synthetic resin.

FIG. 7 is a perspective view of a part of the connector whose surface is covered with synthetic resin.

[Explanation of symbols]

(A)... Anti-slip device (1)... Anti-slip body (2)...Connection member (5)...Engagement core (5a)...Protruding end (6) ... Core part (7)...Synthetic resin (10)…Connector (11)...Hook part (13)...core rod

Claims (2)

[Claims] [Claim 1] Both ends of a non-slip body extending along the tire tread surface are removably engaged and connected by an engaging member to a pair of connecting members that can go around annularly at the side of the tire. An anti-slip device for tires,
One or both of the engaging member on the anti-slip body side and the engaging member on the connecting member side is characterized in that at least the outer peripheral surface of the contact area between the two is formed of a synthetic resin excluding ultra-high molecular weight polyethylene. Anti-slip device for tires. 2. The anti-slip device for a tire according to claim 1, wherein at least one of the engaging members is formed by covering the outer periphery of a metal core with the synthetic resin.