Patents by Inventor Tomoyuki Fujita
Tomoyuki Fujita 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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Publication number: 20100111727Abstract: A solenoid actuator (1) attached to hydraulic equipment comprises a shaft (5) connected to the hydraulic equipment, a plunger (4) fixed to the shaft (5), a coil (12) which magnetically drives the plunger (4), and a first bearing (7) and a second bearing (8) supporting the shaft (5) on either sides of the plunger (4). A plunger front chamber (74) is formed between the first bearing (7) and the plunger (4), and a plunger rear chamber (75) is formed between the plunger (4) and the second bearing (8). By providing a plunger exterior oil passage (63) on the outside of the plunger (4) to connect the plunger front chamber (74) to the plunger rear chamber (75), working oil flows through the plunger exterior oil passage (63) every time the plunger (4) strokes, thereby preventing a deposit of contaminant on the plunger (4) without increasing a stroke resistance of the plunger (4).Type: ApplicationFiled: November 2, 2009Publication date: May 6, 2010Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Hideki Yamagata, Mamoru Hosogai, Hideki Tsuchiya, Yoshiharu Miya, Tomoyuki Fujita, Koichiro Akatsuka, Kenji Yazaki
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Publication number: 20100034681Abstract: A variable capacity vane pump (100) has a pump housing (10) having a high-load bearing part (10a) on which a higher load is exerted than another part when the pump vane pump (100) operates. A control valve (21) for varying a capacity of the vane pump (100) is provided in a valve housing (28) which is formed integrally in the pump housing (10). By arranging the valve housing (28) on the same side of the pump housing (10) as the high-load bearing part (10a) with respect to the rotation axis of the vane pump (100), the high-load bearing part (10a) can be reinforced without increasing the size of the vane pump (100).Type: ApplicationFiled: August 7, 2009Publication date: February 11, 2010Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Tomoyuki Fujita, Masamichi Sugihara, Hiroshi Shiozaki, Koichiro Akatsuka
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Publication number: 20090269233Abstract: A variable displacement vane pump includes a first and a second fluid pressure chamber (31,32) where the cam ring (4) is made eccentric to the rotor (2) by a pressure difference between the first and the second fluid pressure chamber (31,32), a control valve (21) for controlling a pressure of the first and the second fluid pressure chamber (31,32) so that an eccentric amount of the cam ring (4) is reduced to be small with an increase in a rotation speed of the rotor (2), and a flow amount limiting member (22e) for limiting a discharge flow amount of the operating fluid in the second fluid pressure chamber (32) at the time the eccentric amount of the cam ring (4) to the rotor (2) becomes small by supplying the operating fluid to the first fluid pressure chamber (31) and by discharging the operating fluid from the second fluid pressure chamber (32).Type: ApplicationFiled: April 20, 2009Publication date: October 29, 2009Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Tomoyuki Fujita, Masamichi Sugihara, Hiroshi Shiozaki, Koichiro Akatsuka
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Publication number: 20090257899Abstract: A variable displacement vane pump includes a first and a second fluid pressure chamber (31,32) where the cam ring (4) is made eccentric to the rotor (2) by a pressure difference between the first and the second fluid pressure chamber (31,32), a control valve (21) for controlling a pressure of the first and the second fluid pressure chamber (31,32) so that an eccentric amount of the cam ring (4) is reduced to be small with an increase in a rotation speed of the rotor (2), a pressure applying section (36) for applying a pressure to the cam ring (4) in a direction of increasing the eccentric amount all the time, and a cam ring movement restricting portion (12) for defining a minimum eccentric amount of the cam ring (4) by restricting the movement of the cam ring (4) in a direction of decreasing the eccentric amount.Type: ApplicationFiled: April 13, 2009Publication date: October 15, 2009Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Tomoyuki Fujita, Masamichi Sugihara, Hiroshi Shiozaki, Koichiro Akatsuka
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Publication number: 20090217627Abstract: A method and an apparatus for producing a container packing filler are provided, which ensure that a net can be correctly and speedily rolled up into a bulk or ball shape. A stretchable tubular net (N) is fitted around a columnar support member (6). Then, a distal portion of the net is forcibly folded radially outward or inward by a plurality of roller belts (30) disposed circumferentially of the net (N), while the roller belts (30) are moved toward a net proximal side axially of the net (N), whereby the net (N) is rolled up radially outward or inward with the distal portion thereof being forcibly folded by circular rotation and axial movement of the roller belts (30) to form an annular roll portion (C).Type: ApplicationFiled: March 29, 2007Publication date: September 3, 2009Applicants: TAISEI KAKO CO., LTD., SHIONOGI & CO., LTD.Inventors: Yasuyuki Shiraishi, Kenji Ohnishi, Tomoyuki Fujita, Masato Tsuji, Shinji Hiramoto
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Publication number: 20090165297Abstract: The present invention relates to a method of forming a cam shaft by assembling a preliminary shaft (10) having a predetermined outer diameter and a cam lobe (20) including a cam-lobe shaft hole (21) having a diameter larger than the outer diameter of the preliminary shaft (10).Type: ApplicationFiled: December 11, 2008Publication date: July 2, 2009Applicant: MUSASHI SEIMITSU INDUSTRY CO., LTD.Inventors: Akira Mataga, Tomoyuki Fujita
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Publication number: 20090162230Abstract: A vane pump according to the present invention is characterized in that a position of a first suction port located in the forward rotation direction of a rotor is brought closer to a suction port than a position of a second suction port located in the backward rotation direction of the rotor with the suction port as reference by positioning a side plate in the state where the discharge port is brought close to a mounting portion.Type: ApplicationFiled: February 24, 2009Publication date: June 25, 2009Inventors: Tomoyuki Fujita, Hiroshi Shiozaki, Tomomi Noda, Eishin Noguchi, Shinji Yakabe
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Publication number: 20090088286Abstract: In a differential gear, a differential case includes: a first differential case on a side ranging from a pinion-shaft installation part on which a pinion shaft is installed, to a ring gear; and a second differential case on a side opposite to the side ranging from a pinion-shaft installation part on which the pinion shaft is installed, to the ring gear. The first differential case is integrally molded from only a low-carbon steel containing less than 0.45% of C, by forging or by forging and cutting. The second differential case is integrally molded from only a low-carbon steel containing less than 0.45% of C, by forging or by forging and cutting. The first differential case and the second differential case are bonded to each other by welding.Type: ApplicationFiled: September 25, 2008Publication date: April 2, 2009Applicant: MUSASHI SEIMITSU INDUSTRY CO., LTD.Inventors: Tomoyuki FUJITA, Akira Mataga
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Patent number: 7347677Abstract: A body bore 2 formed in a body 1 is closed with a cover 9, as well as a cam ring 4 is incorporated into the body bore 2, and a rotor 6 is arranged inside the cam ring 4. Vanes 7 move in and out along an inner surface of the cam ring 4 with rotation of the rotor 6. An iron reinforcing plate 8 is interposed inside the body bore 2 between the cam ring 4 and the cover 9.Type: GrantFiled: June 2, 2005Date of Patent: March 25, 2008Assignee: Kayaba Industry Co., Ltd.Inventors: Norikazu Ide, Tomoyuki Fujita, Hideyasu Ihira
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Patent number: 7314359Abstract: In a vane pump disposed inside a transmission case of a continuously variable transmission, a pump case (20), a pump drive shaft (8) rotatably supported by a shaft bore (9) of the pump case (20) to rotate a rotor (5), and a drain port (17), one end thereof being opened to a shaft bore (9) of the pump drive shaft (8) and the other end being opened to an outside of the pump case (20) are provided. A leaked oil flown via the drain port (17) from a pump discharge side is discharged to an outside of the pump case (20).Type: GrantFiled: October 20, 2005Date of Patent: January 1, 2008Assignees: Kayaba Industry Co., Ltd., Jatco Ltd.Inventors: Tomoyuki Fujita, Masamichi Sugihara, Yoshinobu Yasue, Hiroyuki Nishiyama, Shingo Hirotsu, Katsutoshi Amano
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Publication number: 20070243094Abstract: A vane pump can effectively utilize the total quantity of a working fluid delivered from a vane section. The pump can be used for fluid pressure operated equipment requiring a high flow rate, does not create torque loss due to a throttle valve, and can prevent the occurrence of cavitation caused by a shortage of suction. The vane pump pressurizes and delivers a working fluid through a vane section. A returning working fluid flowing through a return port is throttled and accelerated by a throttle valve, and a working fluid sent from a suction port is attracted by the accelerated returning working fluid so that the returning working fluid and the working fluid sent from a tank are sent into the vane section.Type: ApplicationFiled: April 10, 2007Publication date: October 18, 2007Inventors: Tomoyuki Fujita, Masamichi Sugihara
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Patent number: 7243672Abstract: A spool bore (4) where a spool (6) slides, a concave portion (23) opened to the spool bore (4) and facing a return port 12 opened to the spool bore (4), and a land portion (11) disposed in an outer periphery of the spool (6) are provided. A width of the concave portion (23) and a width of the return port (12) each are greater than a width of the land portion (11) and a groove bottom (23a) of the concave portion (23) is formed to be a flat plane generally in proportion to an axis line of the spool (6).Type: GrantFiled: March 16, 2005Date of Patent: July 17, 2007Assignee: Kayaba Industry Co., Ltd.Inventors: Norikazu Ide, Tomoyuki Fujita, Hideyasu Ihira
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Publication number: 20070150944Abstract: A user authentication system and method for a communications network is provided. The credential authority publishes an accumulator and issues tokens and credentials to the users who are authorized to access a service. The user computes by himself a derived credential based on the credential issued by the credential authority, and proves to the verifier using the derived credential. If a new user is authorized, other users and the verifier need not update any data. If a user ever authorized is banned, i.e., his/her token is revoked, the credential authority computes the updated accumulator based on the token issued to the banned user, and publishes a revocation increment data comprising the updated accumulator and the increment data about the revoked token. Other users compute their updated credentials by themselves based on the updated revocation increment data received.Type: ApplicationFiled: November 17, 2006Publication date: June 28, 2007Inventors: Ke Zeng, Tomoyuki Fujita, Min-Yu Hsueh
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Publication number: 20070143608Abstract: The invention provides a malleable pseudonym certificate system and method for a communication network. According to one embodiment of the invention, a user acquires a root proof from a trusted entity, generates one or more pseudonym certificates based on the root proof, and sends anonymous public keys each equipped with one pseudonym certificate to verifiers. Through use of the pseudonym certificate, the verifier believes that the user's anonymous public key is certified by the trusted entity. The pseudonym certificate contains no information by which the verifier can figure out the real identity of the user. With the malleable pseudonym certificate system, the trusted entity needs only certify once for the user's root public key. The user can generate by him or herself mass anonymous public keys where each anonymous public key is equipped with a distinct pseudonym certificate.Type: ApplicationFiled: September 20, 2006Publication date: June 21, 2007Inventors: Ke Zeng, Tomoyuki Fujita, Min-Yu Hsueh
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Publication number: 20070134120Abstract: A vane pump according to the present invention is characterized in that a position of a first suction port located in the forward rotation direction of a rotor is brought closer to a suction port than a position of a second suction port located in the backward rotation direction of the rotor with the suction port as reference by positioning a side plate in the state where the discharge port is brought close to a mounting portion.Type: ApplicationFiled: December 12, 2006Publication date: June 14, 2007Inventors: Tomoyuki Fujita, Hiroshi Shiozaki, Tomomi Noda, Eishin Noguchi, Shinji Yakabe
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Publication number: 20070130465Abstract: The invention provides a virtual subscriber identifier system and method of a communication network. According to one embodiment of the invention, a subscriber generates virtual subscriber identifiers by him/her self, generates a subscriber identity mapping data by which a identifier service provider can figure out the real identifier of the owner of the virtual subscriber identifier, and informs peers of the virtual subscriber identifiers. The subscriber identify mapping data may be a data in which a virtual subscriber identifier is associated to the real identifier of the subscriber, and be registered by the subscriber with the identifier service provider. A peer generates a communicating request including a virtual subscriber identifier as target, and sends the request to the identifier service provider, the identifier service provider determines the real identifier of the subscriber from the subscriber identity mapping data, and forwards the communication between the peer and the subscriber's terminal.Type: ApplicationFiled: October 26, 2006Publication date: June 7, 2007Inventors: Ke ZENG, Xiao-Wei Liu, Xiao-Han Wang, Ya-Bo Wang, Hui-Feng Liu, Tomoyuki Fujita, Min-Yu Hsueh
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Publication number: 20070057768Abstract: The invention discloses a radio frequency identification system, comprising: a radio frequency identification tag having an identification code and a set of verifiable data stored therein; and a radio frequency identification reader which sends a reading request to the radio frequency identification tag, requesting to read a first portion of the set of verifiable data, wherein the radio frequency identification tag further comprising control means, which, when the radio frequency identification tag receives the reading request from the radio frequency identification reader, in case of that the set of verifiable data has not been performed a locking operation, performs the locking operation on the set of verifiable data, so that from then on any data of a second portion of the set of verifiable data cannot be read.Type: ApplicationFiled: September 12, 2006Publication date: March 15, 2007Inventors: Ke Zeng, Tomoyuki Fujita, Min-Yu Hsueh
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Publication number: 20060222519Abstract: A fixed capacity pump (P) sucks working oil from a reservoir (R) through a conduit (Rp) and a suction passage (1), and discharges the pressurized working oil into a discharge passage (2) connected to an actuator (A). A choke (21) is disposed in the discharge passage (2), and a flow control valve (F) recirculates a part of the working oil in the discharge passage (2) upstream of the choke (21) to the suction passage (1) according to a pressure loss generated by the choke (21). The characteristic of the choke (21) which significantly increases the flow resistance in a low temperature state makes the flow rate of the recirculated working oil increase, thereby preventing cavitation/noise from occurring in the pump (P) when operated at high speed and in a low temperature state.Type: ApplicationFiled: December 9, 2005Publication date: October 5, 2006Inventors: Tomoyuki Fujita, Masamichi Sugihara, Yoshinobu Yasue
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Patent number: 7060744Abstract: A phosphazene composition which has a content of volatile components of not less than 0.02% by weight and not more than 1.0% by weight when it is heated at 200° C. for 2 hours; is excellent in resistance to hydrolysis, and when the phosphazene composition is added to a resin, there is provided a resin composition which highly maintains the balance of resistance to hydrolysis, flame retardancy and stability of electric characteristics in a high-frequency field of not less than 1 GHz.Type: GrantFiled: August 27, 2003Date of Patent: June 13, 2006Assignee: Asahi Kasei Chemicals CorporationInventors: Fumiki Murakami, Jun-ichi Nakahashi, Atsushi Nanasawa, Tomoyuki Fujita
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Publication number: 20060098819Abstract: Methods, devices and systems for generating a plurality of public keys from one private key with the same generator of a group are described. A public key cryptosystem is also disclosed for generating a plurality of anonymous public keys all of which relate to the same party used for secure communications. Those anonymous public keys are generated using the same generator from one single private key. With the invention, computation is reduced, memory can be saved and security level can be improved.Type: ApplicationFiled: November 9, 2005Publication date: May 11, 2006Inventors: Ke Zeng, Tomoyuki Fujita