Patents by Inventor Yukio Takashima
Yukio Takashima 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: 6592110Abstract: A switchable liquid-filled vibration absorbing mount has a stopper device interposed between a first diaphragm and a bottom portion for regulating downward movement of pushing member when a vacuum is introduced into a switching chamber, so that a protrusion of a valve member does not come out of an inner orifice when a vacuum is applied to the switching chamber to move the first diaphragm to a first position opening the orifice.Type: GrantFiled: December 21, 2000Date of Patent: July 15, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Yukio Takashima, Masashi Takaoka, Yosei Kodama, Nobuya Yoshida, Kazumasa Kuze
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Patent number: 6585242Abstract: This invention provides a switching type liquid-in vibration isolating device capable of opening/closing an orifice by changing over between the atmospheric and negative pressure in a switching chamber corresponding to shake and idle vibration, respectively.Type: GrantFiled: February 15, 2002Date of Patent: July 1, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Yosei Kodama, Yukio Takashima, Nobuya Yoshida, Takashi Miyake
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Patent number: 6554263Abstract: A switched vibration isolator has an elastic base member fixed to a first fitting member, and a tubular member fixed the elastic base member. A partition device is disposed in the tubular member, and has an outer diameter, a first partition side opposing the elastic base member defining a main liquid chamber therebetween, and a second partition side opposite the first partition side. The partition device defines an orifice communicating with the main liquid chamber. A partition receiving plate has a diameter greater than an outer diameter of the partition device and the partition device is mounted thereon. A diaphragm is disposed opposing the partition receiving plate and defining an auxiliary liquid chamber communicated with the main liquid chamber via the orifice. The partition receiving plate and the diaphragm are fixed in place together by an end of the tubular member.Type: GrantFiled: January 18, 2002Date of Patent: April 29, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Yukio Takashima, Tsutomu Hashimoto
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Patent number: 6550753Abstract: The invention provides an antivibration device lightweight and excellent in heat interception, wherein a top opening of a main body fitting (1) and an upper attachment fitting (2) are interconnected through a vibration-isolating base (3); a stopper fitting (8) of a generally cylinder form partly cutout is connected to the main body fitting (1) with its upper edge bent inwardly to form a stopper portion (81), which is located above a stop flange (22) of the upper attachment fitting (2) and has a stopper function against a large vertical displacement; a stopper rubber member (15) is fitted to the stopper fitting (8) so as to extend from the upper surface of the stopper portion (81) to an outer surface of its side plate by vulcanization molding; the cutout portion (83) of the stopper fitting (8) is plugged by a heat shield rubber membrane portion (17) vulcanization molded integrally with the stopper rubber member (15).Type: GrantFiled: November 21, 2001Date of Patent: April 22, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Yukio Takashima, Toshihiro Kakimoto, Hikofumi Yamamoto
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Publication number: 20030067104Abstract: A vibration-isolating device equipped with a vibration-isolating substrate comprising a rubber elastomer interposed between a first attachment metal fitting and a cylindrical main metal fitting, stopper metal fittings to restrain excessive deformation, which is capable of effectively making use of limited installation space as well as easy and proper assembling of the stopper metal fittings. A body portion comprising the vibration-isolating substrate, a stopper portion provided on the first attachment metal fitting and the annular stopper metal fitting is constructed to be an elongated circle or ellipse in cross-section. Furthermore, caulking to the flange portion at the upper end of the stopper metal fitting is done only on both ends (left and right ends shown in the figures) in the direction of the major axis of the elongated circle or the ellipse.Type: ApplicationFiled: March 11, 2002Publication date: April 10, 2003Inventors: Yukio Takashima, Kentaro Yamamoto
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Patent number: 6540215Abstract: The present invention aims at providing a liquid sealed type vibration isolator capable of positioning a partition excellently with the construction of the partition simplified, and maintaining stable damping characteristics of an orifice. To meet the requirements, an outer circumferential portion of the partition forming the orifice is made so that the outer circumferential portion defines at least a part of one or two sides of a cross section of the orifice, and a positioning device formed of a partition press fitting or inserting structure with respect to a groove, or a partition engaging structure is provided in a joint portion between the partition and the other orifice forming member with the construction of the partition simplified, whereby it is rendered possible to improve the accuracy of the partition and obtain a desired cross section of the orifice.Type: GrantFiled: September 7, 2001Date of Patent: April 1, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Masashi Takaoka, Yukio Takashima, Tsutomu Hashimoto
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Publication number: 20030047855Abstract: The present invention is intended, in a controlled-type liquid-filled vibration isolator, to obtain stable liquid filling and assembling by reducing the affection due to press-fitting an admission pipe for admitting, by switching, atmospheric pressure and negative pressure to a switch chamber.Type: ApplicationFiled: September 26, 2001Publication date: March 13, 2003Inventors: Yukio Takashima, Tsutomu Hashimoto
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Patent number: 6523814Abstract: A liquid-in vibration-isolating device, used to support a vibration generating source such as a vehicle engine for the purpose of vibration isolation, prevents hitting sound or adsorption of a diaphragm due to abutment against a partition member and proper functioning of the device is maintained, without increasing the volume of sub-liquid chamber on the diaphragm side. The device includes a cylindrical body fitting and a boss fitting connected via a vibration isolating substrate. A diaphragm is provided on an opening portion at the upper extremity, being partitioned into a main liquid chamber on the vibration isolating substrate side and a sub-liquid chamber on the diaphragm side by means of a partition member. Both liquid chambers are connected through an orifice of the outer circumferential portion. Multiple convex portions are provided for restraining the diaphragm from abutting against the partition member.Type: GrantFiled: February 12, 2002Date of Patent: February 25, 2003Assignee: Toyo Tire & Rubber Co., LtdInventors: Yosei Kodama, Yukio Takashima
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Publication number: 20030030199Abstract: The present invention provides a liquid-filled type vibration isolator which supports a power unit such as an automobile engine or the like which can effectively perform the suppression of the vibration and the improvement of the steering stability and the riding comfort at the time of runninng and the suppression of vibration at the time of idling.Type: ApplicationFiled: August 22, 2001Publication date: February 13, 2003Inventors: Yukio Takashima, Masashi Takaoka
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Patent number: 6517061Abstract: A vibration isolating device includes a body fitting having a cylindrical barrel, an upper side attached fitting disposed upward an axis center of the body fitting, a rudder isolating substrate to connect both fittings, a stopper fitting fixed at an opening extremities of the body fitting and extending upwardly outside the vibration isolating substrate, its upper end portion being folded inside as a stopper portion, so that the stopper fitting acts as a stopper for large displacement of the upper side attachment fitting caused by vibration, a notch window for drainage and ventilation being formed at at least two opposite places at the lower portion of the stopper fitting, and a protrusion for circumferential positioning fitting-in and engaging with the notch windows provided at the opening extremities of the body fitting.Type: GrantFiled: February 14, 2002Date of Patent: February 11, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Kentaro Yamamoto, Hikofumi Yamamoto, Yukio Takashima
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Publication number: 20030011116Abstract: This invention provides a switching type liquid-in vibration isolating device capable of opening/closing an orifice by changing over between the atmospheric and negative pressure in a switching chamber corresponding to shake and idle vibration, respectively.Type: ApplicationFiled: February 15, 2002Publication date: January 16, 2003Inventors: Yosei Kodama, Yukio Takashima, Nobuya Yoshida, Takashi Miyake
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Patent number: 6505822Abstract: A liquid-sealed vibration-proof device is constructed so that a partition dividing its interior into a main and a subsidiary liquid chamber comprises an orifice member having an orifice, a partition plate member provided subjacently in contact with the orifice member, and an elastomeric membrane interposed between a central plate section of the orifice member and the partition plate member. The elastomeric membrane includes a central plate-form portion held and pinched by the orifice and partition plate members, and a diaphragm portion extending outboard it to terminate at an open end which is slidably brought in pressure contact with an annular wall section of the orifice member. Openings are provided in the central plate section and the partition plate member holding and pinching the central plate-form portion, which is partly exposed to both chambers, as an elastic membrane capable of elastic deformation.Type: GrantFiled: August 28, 2001Date of Patent: January 14, 2003Assignee: Toyo Tire & Rubber Co., Ltd.Inventors: Hikofumi Yamamoto, Kentaro Yamamoto, Yukio Takashima
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Publication number: 20020195757Abstract: This invention provides a liquid-in vibration-isolating device used to support a vibration generating source such as vehicle engine for the purpose of vibration isolation, wherein hitting sound or adsorption of a diaphragm due to abutment against a partition member can be avoided, and functions can also be maintained properly, without increasing the volume of sub-liquid chamber on the diaphragm side.Type: ApplicationFiled: February 12, 2002Publication date: December 26, 2002Inventors: Yosei Kodama, Yukio Takashima
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Publication number: 20020195758Abstract: The present invention provides a vibration isolating device, having at least two notch windows for drainage and ventilation, which can easily and securely position and secure a stopper fitting to a body fitting, and also restrain from getting out of position due to loading caused by a stopper action, etc.Type: ApplicationFiled: February 14, 2002Publication date: December 26, 2002Inventors: Kentaro Yamamoto, Hikofumi Yamamoto, Yukio Takashima
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Publication number: 20020158388Abstract: The invention provides a control type liquid-sealed vibration-proof device, with which to reduce dynamic spring rate in wide-ranging frequency bands and obtain stable product characteristics by bringing a membrane facing a switchover chamber into stepwise contact with a wall surface to put into constraint. To that end, between a vibration-insulating base (2) and a diaphragm (4) connected through a main body fitting (1), a partition division (10) including a partition proper (15), a partition plate (16), and a partition-bearing bottom plate (17) is fitted, to compart the interior into a main liquid chamber (7) and a first subsidy liquid chamber (8).Type: ApplicationFiled: February 12, 2002Publication date: October 31, 2002Inventors: Masaaki Itoh, Yukio Takashima
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Publication number: 20020158391Abstract: In a hydraulic antivibration device for use in supporting a vibratory body like an automobile engine, the invention enables it to enhance the dimensional precision of an orifice for shake vibration, to decrease the dispersion in characteristics, and to reduce the dynamic spring rate in a high frequency region thereby reducing noise such as muffled sound.Type: ApplicationFiled: December 3, 2001Publication date: October 31, 2002Inventors: Yosei Kodama, Yukio Takashima
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Publication number: 20020149144Abstract: The present invention is a double orifice type liquid-in vibration isolating device. A partition portion (10) fitted between a vibration isolating substrate (2) combined through the body fitting (1) and a first diaphragm (4) is made up of a partition main member (15) forming a first orifice (13), a partition plate member (16) forming a second sub-liquid chamber (9) and a second orifice (14), and a partition support plate (17) forming the first orifice (14). An inlet/outlet (26) on the main liquid chamber side of both orifices (13, 14) is made common. The first orifice (13) is diverged from a part of the second orifice (14) of liquid passing resistance smaller than that of the first orifice to provide two orifices compactly. Variation or change of the property can easily be coped with by circumferential position adjustment of the component members (15), (16), (17) of the partition portion.Type: ApplicationFiled: March 19, 2002Publication date: October 17, 2002Inventor: Yukio Takashima
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Publication number: 20020140143Abstract: A liquid-sealed anti-vibration device wherein an annular space is formed between an orifice member and a partition plate member, crimped and fixed downwardly of the orifice member to an anti-vibration device proper, of a partition; and a rubber-like elastic membrane is disposed in the space and has a base portion attached fixedly to the one of the orifice member and the partition plate member and an open terminal at a distal side, the open terminal being slidably in pressure contact with the other, thus constituting a cantilevered sliding membrane structure. Thereby it is possible to diminish the amplitude dependency, to reduce the dynamic spring constant in a wide spectrum of medium and high frequencies, and to lower the noise.Type: ApplicationFiled: February 12, 2002Publication date: October 3, 2002Inventors: Hikofumi Yamamoto, Yukio Takashima
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Publication number: 20020135114Abstract: The present invention provides a liquid-in vibration isolating device, wherein a cylindrical body fitting (1) and an attachment fitting (2) are coupled through a vibration isolating substrate (3), an inner chamber surrounded by a diaphragm (4) disposed at the upper end portion and the vibration isolating substrate (3) is partitioned into a main liquid chamber (6) and a first sub-liquid chamber (7) by a partition portion (10), a first orifice (8) is formed on the outer circumferential portion of the partition member (10) to interconnect between the main liquid chamber (6) and the first sub-liquid chamber (7), the partition member (10) is configured by a partition plate member (11) having an elastic film (12) and an orifice member (13), a hollow space between a center plate portion (13b) of the orifice member and the elastic film (12) is formed as a second sub-liquid chamber(15), the center plate portion (13b) of the orifice member (13) is in the form of a convex faced toward the first sub-liquid chamber (7), aType: ApplicationFiled: March 13, 2002Publication date: September 26, 2002Inventors: Yukio Takashima, Yosei Kodama
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Publication number: 20020130454Abstract: The invention provides a liquid-sealed vibration-proof device, whose partition is constituted of and shaped separately by an orifice member having an orifice channel, a partition plate member forcing its outer periphery toward an outer peripheral end of a vibration-proof base on the liquid chamber side, and a second diaphragm closing a central opening of the orifice member. A recessed groove of a marginal portion of the second diaphragm is press-fitted in and engaged with a hook portion projecting inwardly of the orifice member, and a bottom wall of the recessed groove is pinched and pressed by the hook portion and the partition plate member, whereby the assembling is facilitated, ensuring a reliability and functionality of a product.Type: ApplicationFiled: February 8, 2002Publication date: September 19, 2002Inventors: Yukio Takashima, Hikofumi Yamamoto