Patents by Inventor Masanari Kojima
Masanari Kojima 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: 11402027Abstract: A fluid pressure control device includes a neutral passage, a control valve provided in the neutral passage, a first supply passage, and a discharge passage, the control valve has, a switching valve configured to control a flow of a working fluid to the discharge passage from the first actuator in accordance with a pressure in a pilot chamber to which a part of the working fluid supplied from the first supply passage to the first actuator is led, and a throttle portion configured to throttle the flow of the working fluid supplied to the first actuator from the first supply passage, and the pressure on an upstream side of the throttle portion is led to the pilot chamber.Type: GrantFiled: September 28, 2018Date of Patent: August 2, 2022Assignee: KYB CORPORATIONInventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
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Patent number: 11137081Abstract: A control valve includes a housing formed with first and second supply ports, first and second actuator ports, and a pilot port, and a spool accommodated slidably in the housing, and the spool is configured to allow the first supply port and the pilot port to communicate with each other both at the first communication position and the second communication position.Type: GrantFiled: September 28, 2018Date of Patent: October 5, 2021Assignee: KYB CORPORATIONInventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
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Patent number: 11047400Abstract: A fluid pressure control device includes a switching valve, a main pilot passage and a sub pilot passage, the switching valve is configured to be switched to the open position when the working fluid is supplied to the pilot chamber, and to be switched to the throttled position with opening on the downstream side of the switching valve in the neutral passage, and the sub pilot passage is provided with a throttle portion and a check valve in parallel in the throttle portion.Type: GrantFiled: September 28, 2018Date of Patent: June 29, 2021Assignee: KYB CORPORATIONInventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
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Publication number: 20200332907Abstract: A fluid pressure control device includes a neutral passage, a control valve provided in the neutral passage, a first supply passage, and a discharge passage, the control valve has, a switching valve configured to control a flow of a working fluid to the discharge passage from the first actuator in accordance with a pressure in a pilot chamber to which a part of the working fluid supplied from the first supply passage to the first actuator is led, and a throttle portion configured to throttle the flow of the working fluid supplied to the first actuator from the first supply passage, and the pressure on an upstream side of the throttle portion is led to the pilot chamber.Type: ApplicationFiled: September 28, 2018Publication date: October 22, 2020Applicant: KYB CorporationInventors: Masanari KOJIMA, Masayuki NAKAMURA, Takeshi TERAO
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Publication number: 20200200193Abstract: A fluid pressure control device includes a switching valve, a main pilot passage and a sub pilot passage, the switching valve is configured to be switched to the communication position when the working fluid is supplied to the pilot chamber, and to be switched to the shut-off position with opening on the downstream side of the switching valve in the neutral passage, and the switching valve has a throttle portion configured to throttle the flow of the working fluid in the neutral passage at the communication position.Type: ApplicationFiled: September 28, 2018Publication date: June 25, 2020Applicant: KYB CorporationInventors: Masanari KOJIMA, Masayuki NAKAMURA, Takeshi TERAO
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Publication number: 20200116168Abstract: A fluid pressure control device includes a switching valve, a main pilot passage and a sub pilot passage, the switching valve is configured to be switched to the open position when the working fluid is supplied to the pilot chamber, and to be switched to the throttled position with opening on the downstream side of the switching valve in the neutral passage, and the sub pilot passage is provided with a throttle portion and a check valve in parallel in the throttle portion.Type: ApplicationFiled: September 28, 2018Publication date: April 16, 2020Applicant: KYB CorporationInventors: Masanari KOJIMA, Masayuki NAKAMURA, Takeshi TERAO
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Publication number: 20200096121Abstract: A control valve includes a housing formed with first and second supply ports, first and second actuator ports, and a pilot port, and a spool accommodated slidably in the housing, and the spool is configured to allow the first supply port and the pilot port to communicate with each other both at the first communication position and the second communication position.Type: ApplicationFiled: September 28, 2018Publication date: March 26, 2020Applicant: KYB CorporationInventors: Masanari KOJIMA, Masayuki NAKAMURA, Takeshi TERAO
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Publication number: 20190376534Abstract: An electromagnetic pressure reducing valve includes a spool valve configured to allow or shut off communication between a pilot passage and a pilot pressure supply passage and a solenoid configured to give a thrust according to an intensity of a supplied electric current to the spool valve. The spool valve has a pressure receiving surface configured to generate a thrust in a direction opposite to the thrust by the solenoid by action of a pressure of a pilot pressure supply passage, and an area of the pressure receiving surface is set smaller than a cross sectional area of the spool valve.Type: ApplicationFiled: February 13, 2018Publication date: December 12, 2019Applicant: KYB CorporationInventors: Masahiro EGAWA, Atsushi FUJII, Hideki YAMAGATA, Takeshi TERAO, Masanari KOJIMA
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Patent number: 9719532Abstract: A fluid pressure control device for a power shovel includes: a first switching valve configured to permit or prohibit communication between a first pump and a first cylinder; a second switching valve configured to permit or prohibit communication between a second pump and a second cylinder; a third pump configured to allow to supply working fluid to the first cylinder and the second cylinder; a first junction control valve configured to permit or prohibit communication between the third pump and the first cylinder or the second cylinder; and a communication control valve configured to prohibit communication between the third pump and the first cylinder to guide the working fluid discharged by the third pump to the second cylinder by controlling the first junction control valve in a case where the second pump is communicated with the second cylinder by the second switching valve regardless of whether or not the first pump is communicated with the first cylinder by the first switching valve.Type: GrantFiled: November 5, 2013Date of Patent: August 1, 2017Assignee: KYB CorporationInventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
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Patent number: 9702380Abstract: A fluid pressure control device for a power shovel including first, second, and third pumps, a first switching valve connected to the first pump, a second switching valve connected to the second pump, a first merge control valve connected to the third pump, and a second merge control valve provided downstream of the first merge control valve, in which the first merge control valve is switched by a pilot pressure of the first switching valve or the second switching valve to enable communication between the third pump and a downstream side, and the second merge control valve is switched by a pilot pressure of the second switching valve to block communication between the third pump and the first switching valve.Type: GrantFiled: November 6, 2013Date of Patent: July 11, 2017Assignee: KYB CorporationInventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
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Publication number: 20150330416Abstract: A fluid pressure control device for a power shovel includes: a first switching valve configured to permit or prohibit communication between a first pump and a first cylinder; a second switching valve configured to permit or prohibit communication between a second pump and a second cylinder; a third pump configured to allow to supply working fluid to the first cylinder and the second cylinder; a first junction control valve configured to permit or prohibit communication between the third pump and the first cylinder or the second cylinder; and a communication control valve configured to prohibit communication between the third pump and the first cylinder to guide the working fluid discharged by the third pump to the second cylinder by controlling the first junction control valve in a case where the second pump is communicated with the second cylinder by the second switching valve regardless of whether or not the first pump is communicated with the first cylinder by the first switching valve.Type: ApplicationFiled: November 5, 2013Publication date: November 19, 2015Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Masanari KOJIMA, Masayuki NAKAMURA, Takeshi TERAO
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Publication number: 20150285274Abstract: A fluid pressure control device for a power shovel including first, second, and third pumps, a first switching valve connected to the first pump, a second switching valve connected to the second pump, a first merge control valve connected to the third pump, and a second merge control valve provided downstream of the first merge control valve, in which the first merge control valve is switched by a pilot pressure of the first switching valve or the second switching valve to enable communication between the third pump and a downstream side, and the second merge control valve is switched by a pilot pressure of the second switching valve to block communication between the third pump and the first switching valve.Type: ApplicationFiled: November 6, 2013Publication date: October 8, 2015Applicant: KAYABA INDUSTRY CO., LTD.Inventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao