Patents by Inventor Tokuzo Nakajima
Tokuzo Nakajima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6755483Abstract: A tire noise reducing system includes a pneumatic tire, a wheel rim and a noise damper disposed in a cavity formed between the rim and tire the noise damper is made of a porous material having a specific gravity of from 0.005 to 0.06 and secured on a surface facing the cavity, the volume S2 of the noise damper is in a range of from 0.4 to 20.0% of the volume S1 of the cavity. Preferably, the noise damper is provided with an uneven surface or an outer layer for less sound reflection, and the shape index E of the noise damper is more than 1, and the ratio T/W of the thickness T to the width W of the damper is not less than 1.Type: GrantFiled: March 19, 2003Date of Patent: June 29, 2004Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Naoki Yukawa, Masami Nishikawa, Tokuzo Nakajima, Chieko Aoki, Hideaki Sugihara
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Patent number: 6729373Abstract: A tire noise reducing system comprises a wheel rim, a pneumatic tire to be mounted on the wheel rim and a noise damper to be disposed in an annular tire cavity enclosed by the wheel rim and the pneumatic tire mounted thereon, wherein the noise damper is made of a multi-cellular material whose volume S2 is in a range of not less than 0.4% of the volume S1 of said annular tire cavity. Preferably, the specific gravity of the damper is set in a range of from 0.005 to 0.06.Type: GrantFiled: August 30, 2001Date of Patent: May 4, 2004Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Naoki Yukawa, Tokuzo Nakajima, Masami Nishikawa, Chieko Aoki, Hideaki Sugihara
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Patent number: 6726289Abstract: A tire noise reducing system comprises a pneumatic tire, a wheel rim and a noise damper disposed in a cavity formed between the rim and tire when mounted as being surrounded by the tire and rim, the noise damper is made of a porous material having a specific gravity of from 0.005 to 0.06 and secured on a surface facing the cavity, the volume S2 of the noise damper is in a range of from 0.4 to 20.0% of the volume S1 of the cavity. Preferably, the noise damper is provided with an uneven surface or an outer layer for less sound reflection, and the shape index E of the noise damper is more than 1, and the ratio T/W of the thickness T to the width W of the damper is not less than 1.Type: GrantFiled: April 16, 2002Date of Patent: April 27, 2004Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Naoki Yukawa, Masami Nishikawa, Tokuzo Nakajima, Chieko Aoki, Hideaki Sugihara
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Publication number: 20030188817Abstract: A tire noise reducing system comprises a pneumatic tire, a wheel rim and a noise damper disposed in a cavity formed between the rim and tire when mounted as being surrounded by the tire and rim, the noise damper is made of a porous material having a specific gravity of from 0.005 to 0.06 and secured on a surface facing the cavity, the volume S2 of the noise damper is in a range of from 0.4 to 20.0% of the volume S1 of the cavity. Preferably, the noise damper is provided with an uneven surface or an outer layer for less sound reflection, and the shape index E of the noise damper is more than 1, and the ratio T/W of the thickness T to the width W of the damper is not less than 1.Type: ApplicationFiled: March 19, 2003Publication date: October 9, 2003Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Naoki Yukawa, Masami Nishikawa, Tokuzo Nakajima, Chieko Aoki, Hideaki Sugihara
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Patent number: 6588469Abstract: A tire noise reducing system includes a wheel rim, a pneumatic tire mounted on the wheel rim to form an annular tire hollow, and a resonance damper disposed in the annular tire hollow, wherein the damper is one of an annular elastic loose band disposed around the rim and a flexible slack strip having a certain length and fixed to the wheel rim at two points so that a portion between the fixed points slacks, whereby a loose portion of the loose band and the slack portion of the slack strip are risen by a centrifugal force during running to at least partially block the annular tire hollow.Type: GrantFiled: December 22, 2000Date of Patent: July 8, 2003Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Naoki Yukawa, Tokuzo Nakajima, Masami Nishikawa, Chieko Aoki, Hideaki Sugihara
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Patent number: 6581658Abstract: A method for correcting dynamic unbalance of a pneumatic tire which comprises adhering a counter weight to an inner surface of the tire to reduce dynamic unbalance of the tire, wherein the counter weight is made of a material having a specific gravity in a range of from 0.016 to 0.21 such as a strip of a spongy material.Type: GrantFiled: December 18, 2001Date of Patent: June 24, 2003Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Tokuzo Nakajima, Hiroyuki Kobayashi, Naoki Yukawa, Masami Nishikawa
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Publication number: 20030020320Abstract: A tire noise reducing system comprises a pneumatic tire, a wheel rim and a noise damper disposed in a cavity formed between the rim and tire when mounted as being surrounded by the tire and rim, the noise damper is made of a porous material having a specific gravity of from 0.005 to 0.06 and secured on a surface facing the cavity, the volume s2 of the noise damper is in a range of from 0.4 to 20.0% of the volume S1 of the cavity. Preferably, the noise damper is provided with an uneven surface or an outer layer for less sound reflection, and the shape index E of the noise damper is more than 1, and the ratio T/W of the thickness T to the width w of the damper is not less than 1.Type: ApplicationFiled: April 16, 2002Publication date: January 30, 2003Inventors: Naoki Yukawa, Masami Nishikawa, Tokuzo Nakajima, Chieko Aoki, Hideaki Sugihara
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Publication number: 20020124921Abstract: A method for correcting dynamic unbalance of a pneumatic tire which comprises adhering a counter weight to an inner surface of the tire to reduce dynamic unbalance of the tire, wherein the counter weight is made of a material having a specific gravity in a range of from 0.016 to 0.21 such as a strip of a spongy material.Type: ApplicationFiled: December 18, 2001Publication date: September 12, 2002Inventors: Tokuzo Nakajima, Hiroyuki Kobayashi, Naoki Yukawa, Masami Nishikawa
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Publication number: 20020059971Abstract: A tire noise reducing system comprises a wheel rim, a pneumatic tire to be mounted on the wheel rim and a noise damper to be disposed in an annular tire cavity enclosed by the wheel rim and the pneumatic tire mounted thereon, wherein the noise damper is made of a multi-cellular material whose volume S2 is in a range of not less than 0.4% of the volume S1 of said annular tire cavity. Preferably, the specific gravity of the damper is set in a range of from 0.005 to 0.06.Type: ApplicationFiled: August 30, 2001Publication date: May 23, 2002Inventors: Naoki Yukawa, Tokuzo Nakajima, Masami Nishikawa, Chieko Aoki, Hideaki Sugihara
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Publication number: 20010006084Abstract: A tire noise reducing system comprises a wheel rim, a pneumatic tire to be mounted on the wheel rim to form an annular tire hollow, and a resonance damper to be disposed in the annular tire hollow, wherein the damper is one of an annular elastic loose band disposed around the rim and a flexible slack strip having a certain length and fixed to the wheel rim at two points so that a portion between the fixed points slacks, whereby a loose portion of the loose band and the slack portion of the slack strip are risen by a centrifugal force during running to block the annular tire hollow.Type: ApplicationFiled: December 22, 2000Publication date: July 5, 2001Inventors: Naoki Yukawa, Tokuzo Nakajima, Masami Nishikawa, Chieko Aoki, Hideaki Sugihara