JPS5893602A - Safety tire for light vehicle - Google Patents

Abstract

PURPOSE:To simplify the manufacture and improve the road adhesion with abrasion resistance by providing a toroidal supporting member and an external surface part composed of rubber composition. CONSTITUTION:A safety tire 1 is provided with toroidal supporting member 2 and external surface part 3 which is mounted integrally in circumferential direction with the external surface of the crown part of said supporting member 2. The supporting member 2 is desired to form by the foamed polyurethane. The weight of the tire and vertical spring constant are adjustable according to the adjustment of the foaming magnification. The external surface part 3 is incorporated in circumferential direction with the external surface of the crown part of the supporting member 2, the tread part is formed up. The external surface part 3 is mainly composed of the rubber composition having excellent work efficiency.

Description

[Detailed Description of the Invention] ---1 The present invention provides a safety tire that is excellent in wear resistance, ride comfort, road gripping force, and durability, and is easy to manufacture, and can be used especially for motorcycles and on all road surfaces such as rough terrain and sandy terrain. ATV (All, T
Safety tires for errain vehicles (all-road vehicles) Kr1a.

Conventionally, as a safety tire, a toroid-like rethane casting tire obtained by injecting gold rMK into the urethane raw material and curing it by reaction is made by filling and integrating polycrane extomer into the outer skin within the gap between the rim and the rim - the so-called polyurethane. Filled tires and the like are often used, but these are all construction vehicles.

It has been developed as a tire for heavy loads such as tires for industrial vehicles, trucks, and passes, and is used for motorcycles and ATVs that have a low load and run at relatively low speeds.
For example, the former toroid-shaped rethane casting tire has excellent wear resistance, but the rigidity of the tire itself is generally high and impedes ride comfort, and it is difficult to grip the road surface. It has the disadvantage of poor strength and high raw material costs. Furthermore, the latter polyurethane-filled tire has a complicated outer skin structure, which requires time and labor to manufacture, resulting in a problem of high manufacturing costs.

The present invention solves such problems and particularly
DESCRIPTION OF THE PREFERRED EMBODIMENTS The safety tire of the present invention will be explained below with reference to the drawings, with the aim of providing a safety tire that can be suitably adopted as a tire for a light vehicle such as a V-type tie tire.

FIG. 1 shows a sectional view of the safety tire of the present invention.

In the figure, the safety tire (1) of the present invention includes a toroid-shaped support member (hereinafter referred to as the support member) (hereinafter referred to as the support member), and an outer skin 411 that is placed and integrated in the circumferential direction on the outer surface of the crack part of the support member (hereinafter referred to as the support member). 1. The support member □ (2) is made of polyurethane elastic material, and has a JISA hardness of ri.
A ti of 40 to 90', preferably a ti of 50 to 6 G' is used. If the hardness becomes too small, the heat generated by repeated deformation during running causes large thermal deterioration of the polyurethane elastic material, and it becomes susceptible to single-damage cracks.

On the other hand, if the hardness becomes too high, the longitudinal spring constant will increase, impairing riding comfort. The support member (!) is preferably made of polyurethane foam, and by adjusting the foaming ratio, the weight of the tire and the length of the vertical spring can be adjusted. , therefore preferably 0-7 v/ad ~0
．． 2 t/cd density especially 0.4! f/cd~
A material with a density of 0.3 f/- is desirable from the viewpoint of a balance between weight reduction and riding comfort.

Next, the outer skin part (3) is arranged and integrated with the support member (circumferentially on the outer surface of the crack part) to form a tread part.Here, the outer skin part (3) is mainly made of Baum, which has good workability. Formed from a rubber composition. For example, a composition mainly composed of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber, styrene-getadiene rubber, etc. or a mixture thereof may be used.

The composition contains commonly used additives such as carbon,
May contain oil, sulfur, etc. In addition, in the present invention, I/-1'
As shown in Figure 111g, insert the outer shell II ill from one bead part through the crack part to the other bead part.
The outer skin part (
3) can also be configured to form a tread portion and a tidfall portion, in which case the side fall portion effectively prevents damage and cracks to the nide portion when driving on rough terrain or rough roads strewn with rocks. .

Next, uninvented support member 1! ) for the manufacture of
As shown in the figure, the tire can be divided into two parts along the equator line. III, and a ring mold (6) sandwiched between the inner circumference and the outer 1M111 circumference to create a space for molding the support member.
A mold for forming part (7) is used. Ring type (group K
The injection row for injecting the ri Cretan raw material is also outside 1! The zone is provided with an exhaust hole (river), and the urethane raw material is injected into the space (7) from the injection row and reacted and cured at room temperature or under heating. (8
By removing 1) the support member (!) can be seen.

After that, the outer skin of the support member (!)
To apply the SI (unvulcanized or vulcanized) rubber sheet, the retret type technology for conventional tires can be used as is.

Note that the outer skin part 133#i) the red part and the tidfall part can be attached as one body or as separate parts.

First, the support member 1! ) is ill! It can be formed into an arched shape as shown in Figure 1, or it can be formed into a solid shape as shown in Figure 1g2. Particularly preferred from this point of view.

Like a ridge, the safety tire of the present invention includes a toroidal supporting member made of a polyurethane elastomer and an I outer skin-4 made of a rubber composition mainly composed of diene rubber with good workability.
*w Single 7. Yes, abrasive.

It has the advantages of improved S-plane gripping force, excellent riding comfort, and light weight.

[Brief Description of the Drawings] Figure 1111 and Figure 2 are cross-sectional views of the safety tire of the present invention, w
Figure i3 is a schematic cross-sectional view of a seal for manufacturing safe tires. (!)...Troid-shaped support member% (31...Outer skin part. Patent applicant Sumitomo Rubber Industries Co., Ltd. Agent Patent attorney Tadashi Naemura 111 Figure 71 Building 2 Figure/1 Figure 13

Claims (2)

[Claims] (1) A safety tire comprising a toroidal support member and an outer skin that is placed and integrated in the circular direction of the toroidal support member, wherein the toroidal support member is made of polyurethane elastic material. 1. A safety tire, characterized in that the outer skin S is formed of a rubber composition mainly containing diene rubber. (2) The toroidal support member is a foamed body.