Patents by Inventor Jyrki Kajaste
Jyrki Kajaste 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: 10480538Abstract: A plunger pressure accumulator includes a shell; and a plunger which is adapted to move relative to the shell into an interior space of the shell. The interior space is divided into at least two subspaces, a first subspace of which is suppliable with hydraulic fluid of an external system and a second subspace which is provided with a pressurized gas. Between the plunger and the shell is arranged a slide element upon which the plunger is supported to move to a distance apart from an internal surface of the first subspace and from an internal surface of the second subspace. The plunger pressure accumulator is provided with at least one regenerator which is stationary relative to the shell or the plunger.Type: GrantFiled: November 26, 2015Date of Patent: November 19, 2019Assignee: AALTO UNIVERSITY FOUNDATIONInventors: Jyrki Kajaste, Jyri Juhala, Kari Saari
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Patent number: 9970409Abstract: An adaptive hydraulic pressure generator is provided for systems in which the mechanical force producing energy varies significantly, especially for wave energy systems. The pressure generator includes at least two fluid chambers with a piston surface/displacement surface arranged to reciprocate with the fluid chamber, whereby the piston surface/displacement surface acts on the fluid in the chamber by means of the said mutual reciprocating movement. The pressure generator is equipped with a control system which is arranged to connect the chambers to each other and/or to different pressure ducts in such a way that the effective area of the piston/displacement surfaces changes in accordance with the changes in the driving force exerted on the piston/displacement surfaces and/or the body forming the fluid chamber in such a way that the pressure produced by the pressure generator in the fluid supplied to the application exceeds the threshold pressure.Type: GrantFiled: March 20, 2013Date of Patent: May 15, 2018Assignee: Aalto University FoundationInventors: Olof Calonius, Juha Elonen, Heikki Eskonen, Jyrki Kajaste
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Publication number: 20170268539Abstract: A plunger pressure accumulator includes a shell; and a plunger which is adapted to move relative to the shell into an interior space of the shell. The interior space is divided into at least two subspaces, a first subspace of which is suppliable with hydraulic fluid of an external system and a second subspace which is provided with a pressurized gas. Between the plunger and the shell is arranged a slide element upon which the plunger is supported to move to a distance apart from an internal surface of the first subspace and from an internal surface of the second subspace. The plunger pressure accumulator is provided with at least one regenerator which is stationary relative to the shell or the plunger.Type: ApplicationFiled: November 26, 2015Publication date: September 21, 2017Inventors: Jyrki KAJASTE, Jyri JUHALA, Kari SAARI
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Publication number: 20150104332Abstract: An adaptive hydraulic pressure generator is provided for systems in which the mechanical force producing energy varies significantly, especially for wave energy systems. The pressure generator includes at least two fluid chambers with a piston surface/displacement surface arranged to reciprocate with the fluid chamber, whereby the piston surface/displacement surface acts on the fluid in the chamber by means of the said mutual reciprocating movement. The pressure generator is equipped with a control system which is arranged to connect the chambers to each other and/or to different pressure ducts in such a way that the effective area of the piston/displacement surfaces changes in accordance with the changes in the driving force exerted on the piston/displacement surfaces and/or the body forming the fluid chamber in such a way that the pressure produced by the pressure generator in the fluid supplied to the application exceeds the threshold pressure.Type: ApplicationFiled: March 20, 2013Publication date: April 16, 2015Inventors: Olof Calonius, Juha Elonen, Heikki Eskonen, Jyrki Kajaste
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Patent number: 8297241Abstract: A hydraulic actuator (1) comprising a body (2), in which a control arm (5) and a lift means (6) provided with a piston surface (22) are arranged, which lift means is arranged to follow the reference movement of the control arm (5), and an inlet port (3) and an outlet port (4) for hydraulic medium. The body (2) encloses a pressure chamber (10) delimited by the piston surface (22) of the lift means (6), and the movement of the control arm (5) provides a flow connection between the inlet port (3) and the pressure chamber (10) in order to move the lift means (6), and the movement of the control arm (5) in the opposite direction provides a flow connection between the pressure chamber (10) and the outlet port (4) in order to move the lift means (6) in the opposite direction.Type: GrantFiled: July 2, 2008Date of Patent: October 30, 2012Assignee: Wärtsilä Finland OyInventors: Juha Alajoki, Pekka Hautala, Jyrki Kajaste, Jukka Kiijärvi, Petri Kuosmanen, Markus Niemi
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Patent number: 7975673Abstract: A fuel injection arrangement for a piston engine, the arrangement comprising an injector nozzle (1) for injecting fuel into the combustion chamber (6) of the cylinder. A Theological actuator (15) is arranged in connection with the injector nozzle (1), the actuator comprising a space (18) containing Theological fluid and an apparatus (19, 20) by means of which the viscosity of the Theological fluid can be changed for controlling the fuel injection.Type: GrantFiled: November 13, 2007Date of Patent: July 12, 2011Assignee: Wärtsilä Finland OyInventors: Juha Alajoki, Jukka Kiijärvi, Markus Niemi, Jari Kostamo, Jyrki Kajaste, Pekka Hautala
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Publication number: 20100199933Abstract: A hydraulic actuator (1) comprising a body (2), in which a control arm (5) and a lift means (6) provided with a piston surface (22) are arranged, which lift means is arranged to follow the reference movement of the control arm (5), and an inlet port (3) and an outlet port (4) for hydraulic medium. The body (2) encloses a pressure chamber (10) delimited by the piston surface (22) of the lift means (6), and the movement of the control arm (5) provides a flow connection between the inlet port (3) and the pressure chamber (10) in order to move the lift means (6), and the movement of the control arm (5) in the opposite direction provides a flow connection between the pressure chamber (10) and the outlet port (4) in order to move the lift means (6) in the opposite direction.Type: ApplicationFiled: July 2, 2008Publication date: August 12, 2010Applicant: WÄRSILÄ FINLAND OYInventors: Juha Alajoki, Pekka Hautala, Jyrki Kajaste, Jukka Kiijärvi, Petri Kuosmanen, Markus Niemi
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Publication number: 20100050988Abstract: A fuel injection arrangement for a piston engine, the arrangement comprising an injector nozzle (1) for injecting fuel into the combustion chamber (6) of the cylinder A Theological actuator (15) is arranged in connection with the injector nozzle (1), the actuator comprising a space (18) containing Theological fluid and an apparatus (19, 20) by means of which the viscosity of the Theological fluid can be changed for controlling the fuel injection.Type: ApplicationFiled: November 13, 2007Publication date: March 4, 2010Applicant: WÄRTSILÄ FINLAND OYInventors: Juha Alajoki, Jukka Kiijärvi, Markus Niemi, Jari Kostamo, Jyrki Kajaste, Pekka Hautala