By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventor KAGEYAMA, Naoki (Kobe-shi, JP), filed on March 7, 2017, was made available online on September 28, 2017, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.
This patent application is assigned to Sumitomo Rubber Industries, Ltd.
The following quote was obtained by the news editors from the background information supplied by the inventors: "Pneumatic tires to be used with a four-wheel drive vehicle and the like are required to have good rock performance (or running performance on rocky ground) and good mud performance (or running performance on muddy ground). Hereinafter, these performances are comprehensively referred to as off-road performance.
"On the other hand, a pneumatic tire which is, in order to improve the cut resistance of the sidewall portions, provided in the sidewall portions with axially outwardly protruding side protectors has been proposed. Such side protectors can exert tractional force by the engagement and friction between the side protectors and rocks on the rocky ground as well as by the shearing of the mud entered into reentrant portions formed between the side protectors. Thus, the off-road performance can be improved.
"In order that the off-road performance and cut resistance performance are improved, if the side protectors are increased in the protruding height, then the tire sidewall portion is increased in the rubber volume in its radially outer region especially. Therefore, there are problems such that the weight of the tire is unfavorably increased, and the durability of the bead portion of the tire is deteriorated because the flexural stress of the sidewall portion concentrates in a region from the lower sidewall region to the bead portion.
"Prior Art Document
"Japanese Patent application Publication No. 2012-006449"
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventor's summary information for this patent application: "The present invention was made in light of the problems described above, and a primary object of the present invention is to provide a pneumatic tire which is improved in the durability of the bead portion, off-road performance and cut resistance performance in a good balance.
"According to the present invention, a pneumatic tire comprises
"a sidewall portion provided in its radially outer region with side protectors protruding axially outwardly from the outer surface of the radially outer sidewall region, the side protectors arranged in the tire circumferential direction at intervals so that a grooved portion is formed between every two of the circumferentially adjacent side protectors, wherein
"a length in the tire circumferential direction of the above-said grooved portion is in a range of from 50% to 70% of a length in the tire circumferential direction of each of the side protectors on both sides of the above-said grooved portion when the lengths are measured at the same radial position.
"In the pneumatic tire according to the present invention, it is preferable that each of the grooved portions is provided with a projection which, in a tire meridian section including the projection, has a substantially triangular shape having an apex projecting axially outwardly.
"It is preferable that the distance in the tire radial direction between the above-said apex and the tread edge is in a range from 20 to 50 mm.
"It is preferable that the apex of the above-said projection extends continuously in the tire circumferential direction between the two side protectors on both sides of the projection.
"It is preferable that the above-said projection has a protruding height in the above-said tire meridian section including the projection which is less than the protruding height of the side protector on each side thereof in a tire meridian section including the side protector.
"It is preferable that the protruding height of the projection is in a range from 2 to 8 mm.
"In the pneumatic tire according to the present invention, it is preferable that the protruding heights of the side protectors are in a range from 5 to 10 mm.
"In this application including specification and claims, various dimensions, positions and the like of the tire refer to those under a normally inflated unloaded condition of the tire unless otherwise noted.
"The normally inflated unloaded condition is such that the tire is mounted on a standard wheel rim and inflate to a standard pressure but loaded with no tire load.
"The undermentioned normally inflated loaded condition is such that the tire is mounted on the standard wheel rim and inflated to the standard pressure and loaded with the standard tire load.
"The standard wheel rim is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used.
"The standard pressure and the standard tire load are the maximum air pressure and the maximum tire load for the tire specified by the same organization in the Air-pressure/maximum-load Table or similar list. For example, the standard wheel rim is the 'standard rim' specified in JATMA, the 'Measuring Rim' in ETRTO, the 'Design Rim' in TRA or the like. The standard pressure is the 'maximum air pressure' in JATMA, the 'Inflation Pressure' in ETRTO, the maximum pressure given in the 'Tire Load Limits at various Cold Inflation Pressures' table in TRA or the like. The standard load is the 'maximum load capacity' in JATMA, the 'Load Capacity' in ETRTO, the maximum value given in the above-mentioned table in TRA or the like.
"In case of passenger car tires, however, the standard pressure and standard tire load are uniformly defined by 180 kPa and 88% of the maximum tire load, respectively.
"The tread edges Te are the axial outermost edges of the ground contacting patch of the tire which occurs under the normally inflated loaded condition when the camber angle of the tire is zero.
"The tread width TW is the width measured under the normally inflated unloaded condition, as the axial distance between the tread edges Te determined as above.
"The protruding heights of the side protector and the projection are those measured from the smooth contour line S of the radially outer sidewall region from which concavity and convexity for ornamental purposes or for presenting marks, characters and the like are excluded."
URL and more information on this patent application, see: KAGEYAMA, Naoki. Pneumatic Tire. Filed March 7, 2017 and posted September 28, 2017. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220170267034%22.PGNR.&OS=DN/20170267034&RS=DN/20170267034
Keywords for this news article include: Sumitomo Rubber Industries Ltd.
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