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4-Traders Homepage  >  Equities  >  Tokyo  >  Sumitomo Rubber Industries Ltd    5110   JP3404200002

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Sumitomo Rubber Industries : Researchers Submit Patent Application, "Pneumatic Tire", for Approval (USPTO 20170267029)

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10/05/2017 | 07:22pm CEST

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor NAGASE, Masahiro (Kobe-shi, JP), filed on March 17, 2017, was made available online on September 28, 2017.

The patent's assignee is Sumitomo Rubber Industries, Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "Japanese Patent Application Publication No. 2014-210499 (Patent Literature 1) discloses a pneumatic tire having a tread portion whose position when mounted on a vehicle is specified so that the tread portion has outside land regions on the outside-tread-edge side of the tire equator. Of the outside land regions, the axially inner outside land region is provided with v-shaped sipes extending across the entire width of the outside land region, wherein the v-shaped sipe is made up of a first oblique segment and a second oblique segment which are inclined to opposite directions with respect to the tire axial direction. In the v-shaped sipe disclosed in Patent Literature 1, the apex of the v-shape, namely, the intersecting point of the first and second oblique segments is positioned on the tire-equator side or the axially inside of the widthwise center of this outside land region.

"Such arrangement of the apexes of the v-shaped sipes tends to decrease the rigidity of the outside land region more in an outside-tread-edge side than in a tire-equator side. Thereby, in the pneumatic tire of Patent Literature 1, a part of the outside land region on the outside-tread-edge side tends to deform easily during cornering, for example. Thus, there is room for further improvement in the steering stability."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "The present invention was made in view of the above, and a primary object of the present invention is to provide a pneumatic tire, in which the steering stability can be improved.

"According to the present invention, a pneumatic tire comprises

"a tread portion whose position when mounted on a vehicle is specified so that the tread portion has an outside tread edge located toward the outside of the vehicle and an inside tread edge located toward the inside of the vehicle,

"the tread portion provided with an outside land region disposed on the outside-tread-edge side of the tire equator, the outside land region provided with first sipes each extending across the entire width of the outside land region and each comprising a v-shaped portion, wherein

"the v-shaped portion is formed by a first oblique segment and a second oblique segment connected with each other at an apex of the v-shaped portion,

"the apex is located on the outside-tread-edge side of a widthwise center of the outside land region,

"the first oblique segment and the second oblique segment are on the inside-tread-edge side and the outside-tread-edge side of the apex, respectively, and

"the first oblique segment has a maximum depth and the second oblique segment has a maximum depth smaller than the maximum depth of the first oblique segment.

"In the pneumatic tire according to the present invention, it is preferred that each of the first sipes is provided with a transitional portion in which the depth of the first sipe is changed and which is positioned so as not to include the apex.

"In the pneumatic tire according to the present invention, it is preferred that the transitional portion is positioned on the inside-tread-edge side of the apex.

"In the pneumatic tire according to the present invention, it is preferred that the depth of the first oblique segment measured at its end portion on the inside-tread-edge side, is smaller than the above-said maximum depth of the first oblique segment.

"In the pneumatic tire according to the present invention, it is preferred that the tread portion is provided on the inside-tread-edge side of the tire equator with an inside land region,

"the inside land region is provided with second sipes each extending straight across the entire width of the inside land region, and

"the second sipes are inclined to the same direction as the first oblique segments of the first sipes.

"In the pneumatic tire according to the present invention, it is preferred that the second sipes have their ends on the inside-tread-edge side which are respectively connected with wider slot-like depressions formed at the edge on the inside-tread-edge side, of the inside land region.

"In the pneumatic tire according to the present invention, it is preferred that each of the second sipes comprises

"a first portion in which the maximum depth of the second sipe occurs,

"a second portion which is disposed on the outside-tread-edge side of the first portion, and of which maximum depth is smaller than the above-said maximum depth in the first portion, and

"a third portion which is disposed on the inside-tread-edge side of the first portion and of which maximum depth is smaller than the above-said maximum depth in the first portion, and

"the second portion has an axial dimension and the third portion has an axial dimension smaller than the axial dimension of the second portion.

"In the pneumatic tire according to the present invention, it is preferred that in the above-said first portion, the depth of the second sipe is gradually decreased toward the inside tread edge.

"In the pneumatic tire according to the present invention, it is preferred that the second oblique segment of the above-said v-shaped portion has a flat bottom extending at a constant depth.

"In the pneumatic tire according to the present invention, it is preferred that an angle of the above-said first oblique segment with respect to the tire axial direction is not less than 25 degrees and not greater than 35 degrees,

"an angle of the above-said second oblique segment with respect to the tire axial direction is not less than 5 degrees and not greater than 15 degrees, and

"an angle between the first oblique segment and the second oblique segment is not less than 130 degrees and not greater than 150 degrees.

"In the pneumatic tire according to the present invention, it is preferred that the tread portion is provided with circumferentially continuously extending main grooves including a center main groove, an outside shoulder main groove on the outside tread edge side of the center main groove, and an inside shoulder main groove on the inside tread edge side of the center main groove, and

"a groove width of each of the main grooves is not less than 3.5% and not greater than 10.0% of a tread width between the outside tread edge and the inside tread edge.

"In the pneumatic tire according to the present invention, it is preferred that the total of the groove widths of the main grooves is not less than 23% of the tread width.

"In the pneumatic tire according to the present invention, it is preferred that the groove width of the center main groove is larger than the groove width of the shoulder main groove.

"In the pneumatic tire according to the present invention, it is preferred that a groove depth of each of the main groove is not less than 5.0 mm and not greater than 12.0 mm.

"In the pneumatic tire according to the present invention, it is preferred that the tread portion comprises

"an outside shoulder land region between the outside shoulder main groove and the outside tread edge, and

"an outside middle land region between the outside shoulder main groove and the center main groove,

"the outside middle land region is the above-said outside land region provided with the first sipes.

"The outside shoulder land region may be provided with first outside shoulder transverse grooves each extending from the outside tread edge to the outside shoulder main groove and each provided in its axially inner end portion with a siped tie bar rising from the groove bottom.

"Further, the outside shoulder land region may be provided with second outside shoulder transverse grooves alternately with the first outside shoulder transverse grooves, the outside shoulder land region is further provided with

"a first outside shoulder vertical groove extending from each of the first outside shoulder transverse grooves to one of the two circumferentially adjacent second outside shoulder transverse grooves, and

"a second outside shoulder vertical groove extending from the above-said each of the first outside shoulder transverse grooves toward the other of the above-said two circumferentially adjacent second outside shoulder transverse grooves, and terminated within the outside shoulder land region.

"Therefore, in the pneumatic tire according to the present invention, by the provision of the first sipes, distortion of the ground contacting surface of the outside land region is suppressed, and uneven wear of the outside land region can be suppressed.

"Since the first sipe includes the v-shaped portion, when the outside land region is applied by a ground contacting pressure or lateral force, the opposite sidewalls of the first sipe contact firmly with each other, and an apparent rigidity of the outside land region is increased. As a result, the steering stability can be improved.

"When the opposite sidewalls firmly contact with each other, the outside land region shows a relatively high apparent rigidity around the apexes of the v-shaped portions. Therefore, by disposing the apexes on the outside-tread-edge side of the widthwise center of the outside land region, the apparent rigidity of a part on the outside-tread-edge side of the outside land region can be effectively increased.

"Further, as the maximum depth in the second oblique segment on the outside-tread-edge side is set to be smaller than the maximum depth in the first oblique segment on the inside-tread-edge side, the apparent rigidity of the part on the outside-tread-edge side of the outside land region can be further increased. Therefore, deformation of the outside middle land region during cornering is suppressed, and the steering stability is improved.

"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.

"The tread edges Te (Te1, Te2) 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 determined as above.

"The term 'sipe' means a narrow groove having a width not greater than 1.5 mm inclusive of a cut having no substantial width, and

"the term 'groove' means that having a width greater than 1.5 mm."

For additional information on this patent application, see: NAGASE, Masahiro. Pneumatic Tire. Filed March 17, 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=%2220170267029%22.PGNR.&OS=DN/20170267029&RS=DN/20170267029

Keywords for this news article include: Sumitomo Rubber Industries Ltd.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Government & Education Newsletters

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Sales 2017 859 B
EBIT 2017 -
Net income 2017 43 568 M
Debt 2017 145 B
Yield 2017 2,54%
P/E ratio 2017 13,04
P/E ratio 2018 11,21
EV / Sales 2017 0,83x
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