Patents by Inventor Osamu YUNO
Osamu YUNO 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: 20240093752Abstract: One aspect of the present invention is configured in such a manner that a main valve (a valve member) is in abutment with only a ridge portion (a second protrusion portion) on the inner peripheral side of a seat portion (a first seat portion) in a state of being mounted on a piston. This configuration can reduce the radial contact width between the main valve and the seat portion, and contribute to preventing or reducing variations in the valve-opening point and the damping force by managing the radial dimension of the ridge portion on the inner peripheral side of the seat portion to allow the contact diameter between the main valve and the seat portion to be kept constant.Type: ApplicationFiled: March 4, 2022Publication date: March 21, 2024Inventors: Chihiro YABE, Osamu YUNO, Takao NAKADATE
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Publication number: 20240077126Abstract: The present invention causes a low-rigidity disk to be supported by a backup disk (a deformation prevention portion), and therefore can prevent the low-rigidity disk from being deformed due to an inflow of hydraulic oil to between the low-rigidity disk and a disk adjacent thereto according to an increase in a pressure in a cylinder upper chamber during an extension stroke, and can improve the durability of the low-rigidity disk.Type: ApplicationFiled: February 1, 2022Publication date: March 7, 2024Inventors: Takahiro MORI, Osamu YUNO, Takao NAKADATE
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Publication number: 20230296158Abstract: A shock absorber is configured in such a manner that a flow passage area of each of first orifices 169 and 189 is smallest throughout a communication passage that establishes communication between a chamber 2A or 2B on an upstream side and a chamber 2B or 2A on a downstream side, and therefore prevents a pressure in a back-pressure chamber 55 or 26 from excessively increasing. As a result, the shock absorber can prevent overshoot of a damping force due to a delay of valve opening of a main valve 53 or 23 due to a remaining pressure in the back-pressure chamber 55 or 26 when a movement of a piston 3 is switched from one direction to an opposite direction.Type: ApplicationFiled: September 13, 2021Publication date: September 21, 2023Inventors: Hirohito ISHII, Takao NAKADATE, Osamu YUNO, Yuta YAMAGUCHI
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Publication number: 20220099153Abstract: Provided is a shock absorber in which a check valve seated on a seat portion (second seat portion) having an annular shape is quickly opened during a reverse stroke. As a result, a working fluid in a chamber on a downstream side can be quickly introduced into a back-pressure chamber. Hence, a delay in response of a damping force, which may be caused by sticking of the check valve to a relief valve, can be suppressed.Type: ApplicationFiled: January 10, 2020Publication date: March 31, 2022Inventors: Osamu YUNO, Takao NAKADATE, Shunsuke MORI, Yu ISHIMARU
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Patent number: 11261932Abstract: The present invention provides a shock absorber capable of improving responsiveness during an extension stroke without leading to an increase in an axial length. A shock absorber includes a chamber provided on a one-side end of a pilot valve and disposed in communication with a cylinder upper chamber, a communication passage configured to establish communication between the chamber and a cylinder lower chamber via a compression-side passage, and a check valve configured to permit hydraulic fluid in the communication passage to flow into the cylinder lower chamber during an extension stroke.Type: GrantFiled: July 24, 2018Date of Patent: March 1, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Kosuke Kadokura, Yohei Katayama, Takao Nakadate, Osamu Yuno, Shunsuke Mori
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Patent number: 11204074Abstract: Provided is a shock absorber that is so designed that fail-down is prevented, which is caused when solenoid thrust is relatively small. The shock absorber comprises a chamber disposed on one side of a valve element and communicating with a cylinder's one side chamber and a cylinder's other side chamber, a first communication passage allowing the chamber and the cylinder's one side chamber to communicate with each other, and a second communication passage allowing the chamber and the cylinder's other side chamber to communicate with each other. The first communication passage includes a first orifice, and the second communication passage includes a second orifice.Type: GrantFiled: September 4, 2018Date of Patent: December 21, 2021Assignee: HITACHI ASTEMO, LTD.Inventors: Shunsuke Mori, Takao Nakadate, Yu Ishimaru, Osamu Yuno
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Patent number: 10941830Abstract: In a shock absorber, an extension-side check valve permitting a flow of hydraulic fluid directed from a common passage to a compression-side passage side, and a compression-side orifice establishing communication between the compression-side passage and a compression-side back-pressure chamber are provided in an extension-side discharge passage. A compression-side check valve permitting a flow of hydraulic fluid directed from the common passage to an extension-side passage side, and an extension-side orifice establishing communication between the extension-side passage and an extension-side back-pressure chamber are provided in a compression-side discharge passage. A pilot valve includes a valve body slidably inserted in the common passage, and a valve spring biasing the valve body in a valve-opening direction.Type: GrantFiled: January 16, 2018Date of Patent: March 9, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Kosuke Kadokura, Takao Nakadate, Shunsuke Mori, Osamu Yuno
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Publication number: 20200191229Abstract: Provided is a shock absorber that is so designed that fail-down is prevented, which is caused when solenoid thrust is relatively small. The shock absorber comprises a chamber disposed on one side of a valve element and communicating with a cylinder's one side chamber and a cylinder's other side chamber, a first communication passage allowing the chamber and the cylinder's one side chamber to communicate with each other, and a second communication passage allowing the chamber and the cylinder's other side chamber to communicate with each other. The first communication passage includes a first orifice, and the second communication passage includes a second orifice.Type: ApplicationFiled: September 4, 2018Publication date: June 18, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Shunsuke MORI, Takao NAKADATE, Yu ISHIMARU, Osamu YUNO
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Publication number: 20200166097Abstract: The present invention provides a shock absorber capable of improving responsiveness during an extension stroke without leading to an increase in an axial length. A shock absorber includes a chamber provided on a one-side end of a pilot valve and disposed in communication with a cylinder upper chamber, a communication passage configured to establish communication between the chamber and a cylinder lower chamber via a compression-side passage, and a check valve configured to permit hydraulic fluid in the communication passage to flow into the cylinder lower chamber during an extension stroke.Type: ApplicationFiled: July 24, 2018Publication date: May 28, 2020Inventors: Kosuke KADOKURA, Yohei KATAYAMA, Takao NAKADATE, Osamu YUNO, Shunsuke MORI
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Patent number: 10634207Abstract: A damping force control type shock absorber capable of achieving both air bleeding performance and damping force responsiveness at reduced cost. When a pilot valve (47) is closed during the extension stroke of a piston rod (6), a cylinder upper chamber (2A) is communicated with a back-pressure chamber (46) through a passage (73) including an orifice (76), a communicating passage (70), a pilot chamber (33), and a communicating passage (50). At this time, the cylinder upper chamber (2A) is not communicated with a cylinder lower chamber (2B); therefore, damping force responsiveness is ensured. Further, because there is no need to provide a check valve in the passage, it is possible to suppress an increase in manufacturing cost. Further, air entering the pilot chamber (33) moves upward through the communicating passage (70). Therefore, the air can be discharged into the cylinder upper chamber (2A) through the passage (73).Type: GrantFiled: November 16, 2016Date of Patent: April 28, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Osamu Yuno, Yasuhiro Aoki
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Publication number: 20200032872Abstract: In a shock absorber, an extension-side check valve permitting a flow of hydraulic fluid directed from a common passage to a compression-side passage side, and a compression-side orifice establishing communication between the compression-side passage and a compression-side back-pressure chamber are provided in an extension-side discharge passage. A compression-side check valve permitting a flow of hydraulic fluid directed from the common passage to an extension-side passage side, and an extension-side orifice establishing communication between the extension-side passage and an extension-side back-pressure chamber are provided in a compression-side discharge passage. A pilot valve includes a valve body slidably inserted in the common passage, and a valve spring biasing the valve body in a valve-opening direction.Type: ApplicationFiled: January 16, 2018Publication date: January 30, 2020Inventors: Kosuke KADOKURA, Takao NAKADATE, Shunsuke MORI, Osamu YUNO
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Patent number: 10487904Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.Type: GrantFiled: September 14, 2016Date of Patent: November 26, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Motohiro Hirao, Umi Tanabe, Osamu Yuno, Shigeo Katayama, Tomoyuki Ri
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Publication number: 20190056009Abstract: A cylinder device that enables both prevention of leakage from a flow channel and improvement of assemblability. A shock absorber is filled with an electrorheological fluid as a hydraulic fluid. The shock absorber generates a potential difference within an electrode path and controls viscosity of the electrorheological fluid passing through the electrode path, thus controlling a generated damping force. A plurality of partition walls are disposed between an inner cylinder and an electrode tube. A plurality of spiral flow channels are formed between the inner cylinder and the electrode tube. The partition walls are attached to the outer peripheral surface of the inner cylinder. The partition walls have a sectional shape in which an electrode tube side is smaller in wall thickness than an inner cylinder side. The partition walls include a pointed tip on the non-attached side, which is oriented to a high pressure side of the flow channels.Type: ApplicationFiled: February 23, 2017Publication date: February 21, 2019Inventors: Yasuhiro AOKI, Osamu YUNO, Umi TANABE
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Publication number: 20180355941Abstract: A damping force control type shock absorber capable of achieving both air bleeding performance and damping force responsiveness at reduced cost. When a pilot valve (47) is closed during the extension stroke of a piston rod (6), a cylinder upper chamber (2A) is communicated with a back-pressure chamber (46) through a passage (73) including an orifice (76), a communicating passage (70), a pilot chamber (33), and a communicating passage (50). At this time, the cylinder upper chamber (2A) is not communicated with a cylinder lower chamber (2B); therefore, damping force responsiveness is ensured. Further, because there is no need to provide a check valve in the passage, it is possible to suppress an increase in manufacturing cost. Further, air entering the pilot chamber (33) moves upward through the communicating passage (70). Therefore, the air can be discharged into the cylinder upper chamber (2A) through the passage (73).Type: ApplicationFiled: November 16, 2016Publication date: December 13, 2018Inventors: Osamu YUNO, Yasuhiro AOKI
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Publication number: 20180252290Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.Type: ApplicationFiled: September 14, 2016Publication date: September 6, 2018Inventors: Motohiro HIRAO, Umi TANABE, Osamu YUNO, Shigeo KATAYAMA, Tomoyuki RI
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Patent number: 9046145Abstract: A shock absorber in which a flow of hydraulic oil caused by sliding movement of a piston in a cylinder is controlled by a pilot type main valve and a pilot valve to generate damping force. The valve-opening operation of the main valve is controlled by adjusting the pressure in a pilot chamber with the pilot valve. A valve block and a solenoid block are connected together into one unit and inserted into a casing before being secured with a nut. At this time, an actuating rod of the solenoid block is engaged with a pilot valve member retained by a pilot spring and a fail-safe spring in a cylindrical portion of a pilot body of the valve block.Type: GrantFiled: May 24, 2012Date of Patent: June 2, 2015Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Hiroshi Murakami, Osamu Yuno, Tomohiko Fujioka, Takashi Nezu, Shunsuke Mori
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Publication number: 20120305349Abstract: A shock absorber in which a flow of hydraulic oil caused by sliding movement of a piston in a cylinder is controlled by a pilot type main valve and a pilot valve to generate damping force. The valve-opening operation of the main valve is controlled by adjusting the pressure in a pilot chamber with the pilot valve. A valve block and a solenoid block are connected together into one unit and inserted into a casing before being secured with a nut. At this time, an actuating rod of the solenoid block is engaged with a pilot valve member retained by a pilot spring and a fail-safe spring in a cylindrical portion of a pilot body of the valve block.Type: ApplicationFiled: May 24, 2012Publication date: December 6, 2012Inventors: Hiroshi MURAKAMI, Osamu YUNO, Tomohiko FUJIOKA, Takashi NEZU, Shunsuke MORI