JPH01314602A - Non-pneumatic type tire - Google Patents

Abstract

PURPOSE:To decrease oscillation for improving comfortableness in respect of ribs which are joined to the side of a web joining together an outer peripheral wheel and an inner peripheral wheel in a concentric arrangement by setting the number of the ribs joined to the outer peripheral wheel more than that joined to the inner peripheral wheel. CONSTITUTION:A non-pneumatic type tire 1 has its outer peripheral wheel 2 and its inner peripheral wheel 3 in a concentric arrangement joined integrally by means of one ring plate-shaped web 4. Then, a large number of ribs 5 are joined integrally to both sides of the web 4 with a preset space along a peripheral direction. Also, the respective ribs 5 are inclined at a preset angle alpha to a radial face. In above-mentioned constitution, the respective branch ribs 5d are diverged from the way of the respective ribs 5 to join the respective ends of the outer periphery to the outer peripheral wheel 3. That is, the joined portions of the respective ribs 5, including the respective branch ribs 5d, to the outer peripheral wheel 3 are set more than (to be twice) those to the inner peripheral wheel 2. Thus, oscillation which occurs in the joined portions of the respective ribs 5 is made into a short and minute cycle.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to non-pneumatic tires with improved ride comfort.

[Prior art]

Because non-pneumatic tires have a solid rubber structure, they can undergo local deformation like pneumatic tires, and therefore can exhibit load-bearing capacity with the same ride comfort as pneumatic tires. It was considered difficult.

In contrast to such conventional non-pneumatic tires, a tire such as that described in JP-A-60-236803 has been proposed as a tire that has the deformation and load-bearing characteristics of a pneumatic tire. has been done. The non-pneumatic tire proposed here has an outer circumferential ring and an inner circumferential ring arranged concentrically, a web connecting these two wheels, and a large number of webs inclined diagonally with respect to the radial plane. A rib was provided for buffering purposes.

However, in this non-pneumatic tire, there are intermittently circumferentially connecting portions of a large number of ribs to the outer wheel, and these connecting portions are more rigid than other portions, so the tire does not touch the road surface. When driving, the highly rigid parts will generate rough vibrations. therefore,
Compared to pneumatic tires, they had the disadvantage of not being as comfortable to ride.

[Problems to be Solved by the Invention] - An object of the present invention is to provide a non-pneumatic tire that eliminates the drawbacks of the conventional non-pneumatic tires mentioned above and provides a ride comfort close to that of pneumatic tires. It is in.

[Failure to solve the problem]

To achieve the above object, the present invention connects an outer circumferential ring and an inner circumferential ring of elastic material arranged concentrically with a web of elastic material, and further connects to the side surface of this web and the A non-pneumatic type in which a plurality of elastic material ridges that are connected to the outer ring and the inner ring and extend laterally are provided at intervals in the circumferential direction, and these riffs are inclined with respect to the radial plane. The tire is characterized in that the number of ribs connected to the outer circumferential ring is greater than the number of ribs connected to the inner circumferential ring.

Moreover, as a non-pneumatic tire of the present invention that achieves the above object, instead of the above structure, the direction of the connecting portion of the rib to the outer circumferential ring may be made oblique with respect to the tire circumferential direction.

In the present invention, the number of webs connecting the outer circumferential ring and the inner circumferential ring is limited to one, but a plurality of webs may be provided.

Further, the plurality of ribs may be provided independently from each other, or may be configured such that some of them are connected to each other. In the case of the former aspect of the present invention, one or more branch ribs may be branched from the middle of the rib and connected together with the rib body to the outer ring.

In the present invention, the outer ring, the inner ring, the web, and the ribs are made of an elastic material, but it is preferable that they are integrally molded. As the elastic material, natural rubber and synthetic rubber, both of which are used in conventional pneumatic tires, are preferably used as raw rubber, but it is preferable to use one with a high elastic modulus and hardness. Among these, polyurethane rubber is particularly suitable.

The following will explain the embodiments shown in the figures.

1 and 2 show an example of the non-pneumatic tire of the present invention.

Reference numeral 1 denotes a non-pneumatic tire according to the present invention, which is mounted on a wheel rim R (FIG. 2) as shown by an imaginary line (dashed line). This non-pneumatic tire 1 includes an outer circumferential wheel 2, an inner circumferential wheel 3. The web 4, ribs 5, etc. are integrally molded from an elastic material such as rubber. Furthermore, a tread portion 6 made of rubber with high wear resistance is integrally adhered to the outer periphery of the outer circumferential ring 2. This tread portion 6 is preferably molded integrally with the main body such as the outer circumferential ring 2 .

The outer circumferential ring 2 and the inner circumferential ring 3 are arranged concentrically, and the web 4 is formed into a ring plate-like piece in this embodiment.
The outer circumferential ring 2 and the inner circumferential ring 3 are integrally connected.

On both sides of this web 4, a large number of ribs 5 extending laterally are integrally connected at predetermined intervals along the circumferential direction, and these ribs 5 also have a radius relative to the wheels 2.3. Both ends in the direction are each integrally connected. These ribs 5 are obliquely inclined with respect to the radial plane F at an angle α. By dispersing such a large number of inclined ribs 5 in the circumferential direction, it is possible to locally deform only a portion of the tire when it rotates, and the deformation and load burden can be reduced as with a pneumatic tire. enable.

Further, the rib 5 has a branch rib 561d branching from the middle thereof. This technical rib 5d is connected to the web 4 together with the rib 5, and further connects its radial end to the outer ring 2. Therefore, the outer circumferential ring 2 alternately has connecting portions where the rib 5 bodies are connected and connecting portions where the branch ribs 5d are connected, but the inner circumferential ring 3 only has connecting portions where the rib 5 bodies are connected. There will be. As a result, the outer circumferential ring 2 has twice as many rib connecting parts as the inner circumferential ring 3.

Therefore, according to the above-described non-pneumatic tire of the present invention, the rough vibrations generated by the connecting portions of the ribs when running on a road surface become minute vibrations with extremely short cycles, and the ride comfort can be improved. In other words, the ride comfort can be made to approximate that of a pneumatic tire as much as possible. The effect of improving riding comfort becomes greater as the number of ribs connected to the outer circumferential wheel increases. In the present invention, the preferred number of ribs connected to the outer ring side is at least 1.5 times or more, more preferably twice or more, based on the number of ribs connected to the inner ring side. It's good to do that.

3 and 4 show other embodiments of the invention.

In this embodiment, the connecting portion of the rib 5 to the outer circumferential ring 2 is diagonal with respect to the tire circumferential direction. By connecting the rib 5 to the outer ring 2 in this way, the projected length of the rib connecting portion in the tire circumferential direction becomes longer, and as a result, vibrations can be reduced when the tire contacts the road surface. . In other words, the riding comfort is improved.

〔Effect of the invention〕

As described above, in the non-pneumatic tire of the present invention, the number of ribs connected to the outer circumferential ring is greater than the number of ribs connected to the inner circumferential ring, thereby shortening the pitch of the rib connecting part, or by shortening the pitch of the rib connecting part. Since the projection length is increased by making the projection length oblique to the tire circumferential direction, vibrations generated when the tire runs on a road surface can be miniaturized. Therefore, the riding comfort can be made to approximate that of a pneumatic tire.

[Brief explanation of the drawing]

FIG. 1 is a side view of a non-pneumatic tire according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along arrows -■ in FIG. 1, and FIG. 3 is a schematic diagram of a non-pneumatic tire according to another embodiment. side view showing the part;
FIG. 4 is a plan view of the main part as viewed from the arrow ``■'' in FIG. 3. ■...Non-pneumatic tire, 2...Outer circumferential ring, 3...Inner circumferential ring, 4...Web, 5...Rib, 5d...branch rib, 6...tread portion. Agent Patent Attorney Nobuo Ogawa −

Claims (2)

[Claims] (1) A web of elastic material connects an outer circumferential ring and an inner circumferential ring made of an elastic material arranged concentrically, and further connects to the side surface of this web, and the outer circumferential ring and the inner circumferential ring. In a non-pneumatic tire, a plurality of ribs made of an elastic material are provided at intervals in the circumferential direction, and these ribs are inclined with respect to a plane in the radial direction. A non-pneumatic tire in which the number of ribs connected to the inner circumferential ring is greater than the number of ribs connected to the inner circumferential ring. (2) A web of elastic material connects an outer circumferential ring and an inner circumferential ring made of an elastic material arranged concentrically, and further connects to the side surface of this web, and the outer circumferential ring and the inner circumferential ring. In a non-pneumatic tire, a plurality of ribs made of an elastic material are provided at intervals in the circumferential direction, and these ribs are inclined with respect to a plane in the radial direction. A non-pneumatic tire in which the direction of the connecting part of the rib is diagonal to the circumferential direction of the tire.