Patents by Inventor Hironari Akashi

Hironari Akashi 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).

  • Patent number: 11473571
    Abstract: A sealed refrigerant compressor (10A) accommodates an electric component (20A) and a compression component (30) in a sealed container (11). A crankshaft (40) included in the compression component (30) includes a main shaft part (41) and an eccentric shaft part (42). A main shaft part (41) is secured to a rotor (22A) of the electric component (20A). The rotor (22A) is provided with a balance adjustment means such as a balance hole (27), which adjusts an unbalanced load caused by the structure of the main shaft part (41).
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: October 18, 2022
    Assignee: Panasonic Appliances Refrigeration Devices Singapore
    Inventors: Hironari Akashi, Kazuhiro Yokota
  • Publication number: 20210123426
    Abstract: A hermetic refrigerant compressor (100) includes a sealed container (101) in which lubricating oil (103) having a kinematic viscosity in a range of 1 to 9 mm2/S at 40° C. is stored, the lubricating oil (103) containing a sliding modifier that is either sulfur or a sulfur-containing compound. A compression element (107) includes a shaft part that is a crank shaft (108). In a case where a sliding surface of a main shaft (109) is a single sliding surface, a length of the single sliding surface in an axial direction is a single sliding length L, whereas in a case where the sliding surface is divided into a plurality of sliding surfaces, a length of one of the sliding surfaces in the axial direction, the one sliding surface having the least length in the axial direction among the plurality of sliding surfaces, is the single sliding length L, and a ratio L/D of the single sliding length L to an external diameter D of the main shaft (109) is less than or equal to 0.51.
    Type: Application
    Filed: June 25, 2019
    Publication date: April 29, 2021
    Applicant: Panasonic Appliances Refrigeration Devices Singapore
    Inventors: Hiroto HAYASHI, Hirotaka KAWABATA, Terumasa IDE, Hironari AKASHI, Masanobu GONDO, Akio YAGI
  • Publication number: 20210062798
    Abstract: A sealed refrigerant compressor (10A) accommodates an electric component (20A) and a compression component (30) in a sealed container (11). A crankshaft (40) included in the compression component (30) includes a main shaft part (41) and an eccentric shaft part (42). A main shaft part (41) is secured to a rotor (22A) of the electric component (20A). The rotor (22A) is provided with a balance adjustment means such as a balance hole (27), which adjusts an unbalanced load caused by the structure of the main shaft part (41).
    Type: Application
    Filed: May 21, 2018
    Publication date: March 4, 2021
    Applicant: Panasonic Appliances Refrigeration Devices Singapore
    Inventors: Hironari AKASHI, Kazuhiro YOKOTA
  • Publication number: 20190285063
    Abstract: Inside a sealed container (101) of a refrigerant compressor (100), lubricating oil (103) having a kinematic viscosity at 40° C. of 0.1 mm2/S to 5.1 mm2/S is stored, and an electric element (106) and a compression element (107) are accommodated. The compression element (107) is provided with, as a shaft part, a crankshaft (108) comprising a main shaft (109) and an eccentric shaft (110), and as bearing parts, a main bearing (114) that axially supports the main shaft (109) and an eccentric bearing (119) that axially supports the eccentric shaft (110). At least one surface of the main shaft (109) and the eccentric shaft (110) is subjected to a surface treatment, e.g., formation of an oxide film, having a hardness equal to or greater than that of a bearing part (the main bearing (114) or the eccentric bearing (119)). Satisfactory reliability in sliding parts can thereby be achieved even if lubricating oil having lower viscosity is used.
    Type: Application
    Filed: November 28, 2017
    Publication date: September 19, 2019
    Applicant: Panasonic Appliances Refrigeration Devices Singapore
    Inventors: Yasushi HAYASHI, Hirotaka KAWABATA, Yoshinori ISHIDA, Shingo OYAGI, Terumasa IDE, Akio YAGI, Hironari AKASHI, Hiroto HAYASHI, Kazuhiro YOKOTA, Hiroki TORIMASU
  • Patent number: 10371134
    Abstract: A sealed compressor comprises a sealed container (101) which accommodates an electric component (105) and a compression component (106); wherein the compression component (106) includes a shaft (110) including a main shaft section (111) and an eccentric shaft section (112), a cylinder block (114), a piston (126), and a main bearing unit (120) mounted to the cylinder block (114) and supporting the main shaft section (112) such that the main shaft section (112) is rotatable, a thrust ball bearing (132) mounted to a thrust surface (130) of the main bearing unit (120); and the thrust ball bearing (132) includes a plurality of balls (134) held in a cage (133), an upper race (135) having main surfaces one of which is in contact with upper portions of the balls (134); and a lower race (136) having main surfaces one of which is in contact with lower portions of the balls (134) and; a restricting means for restricting a displacement of the upper race (135) with respect to the shaft (110).
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: August 6, 2019
    Assignee: PANASONIC APPLIANCES REFRIGERATION DEVICES SINGAPORE
    Inventors: Kousuke Tsuboi, Kiwamu Watanabe, Akihiko Kubota, Hironari Akashi, Terumasa Ide
  • Publication number: 20160273579
    Abstract: A sealed compressor of the present invention comprises a sealed container (101) accommodating an electric component (105) and a compression component (106) and storing lubricating oil (102); wherein the compression component (106) includes a shaft (110) including a main shaft section (111), a main bearing unit (120), and a thrust ball bearing (132); wherein the main shaft section (111) is provided with a first oil feeding passage (150) to transport the lubricating oil (102); the thrust ball bearing (132) includes a cage (133), balls (134), an upper race (135) and a lower race (136), and the thrust ball bearing (132) is provided with a second oil feeding passage (160) communicated with the first oil feeding passage (150) and configured to feed the lubricating oil (102) to the raceway groove provided in at least one of the upper race (135) and the lower race (136), and a discharge passage (180) through which the lubricating oil (102) is discharged.
    Type: Application
    Filed: May 31, 2016
    Publication date: September 22, 2016
    Inventors: Hironari AKASHI, Terumasa IDE, Kousuke TSUBOI, Kiwamu WATANABE, Hidenori KOBAYASHI, Makoto KATAYAMA, Yasushi HAYASHI
  • Patent number: 9422930
    Abstract: The present invention provides a refrigerant compressor which may assure excellent reliability while using low-viscosity refrigerant. The refrigerant compressor is characterized in that the viscosity of oil stored in hermetic container ranges from VG3 to VG8, and the boiling component at 350° C. or over is not less than 10% and not higher than 30% in volume ratio, and the boiling component at 300° C. or less is not less than 50% and not higher than 70% in volume ratio. Accordingly, the input reduction at sliding surfaces can be realized, and the lubricant is evaporated, therefore it is possible to prevent defective compression caused by PET (polyethylene phthalate) or the like deposited on the surfaces of the discharge reed and the like, and to enhance the efficiency and reliability.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: August 23, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hirotaka Kawabata, Hironari Akashi, Kazuhiro Yokota
  • Publication number: 20150030478
    Abstract: A sealed compressor comprises a sealed container (101) which accommodates an electric component (105) and a compression component (106); wherein the compression component (106) includes a shaft (110) including a main shaft section (111) and an eccentric shaft section (112), a cylinder block (114), a piston (126), and a main bearing unit (120) mounted to the cylinder block (114) and supporting the main shaft section (112) such that the main shaft section (112) is rotatable, a thrust ball bearing (132) mounted to a thrust surface (130) of the main bearing unit (120); and the thrust ball bearing (132) includes a plurality of balls (134) held in a cage (133), an upper race (135) having main surfaces one of which is in contact with upper portions of the balls (134); and a lower race (136) having main surfaces one of which is in contact with lower portions of the balls (134) and; a restricting means for restricting a displacement of the upper race (135) with respect to the shaft (110).
    Type: Application
    Filed: April 12, 2013
    Publication date: January 29, 2015
    Applicant: Panasonic Corporation
    Inventors: Kousuke Tsuboi, Kiwamu Watanabe, Akihiko Kubota, Hironari Akashi, Terumasa Ide
  • Publication number: 20140154111
    Abstract: A sealed compressor of the present invention comprises a sealed container (101) accommodating an electric component (105) and a compression component (106) and storing lubricating oil (102); wherein the compression component (106) includes a shaft (110) including a main shaft section (111), a main bearing unit (120), and a thrust ball bearing (132); wherein the main shaft section (111) is provided with a first oil feeding passage (150) to transport the lubricating oil (102); the thrust ball bearing (132) includes a cage (133), balls (134), an upper race (135) and a lower race (136), and the thrust ball bearing (132) is provided with a second oil feeding passage (160) communicated with the first oil feeding passage (150) and configured to feed the lubricating oil (102) to the raceway groove provided in at least one of the upper race (135) and the lower race (136), and a discharge passage (180) through which the lubricating oil (102) is discharged.
    Type: Application
    Filed: March 15, 2013
    Publication date: June 5, 2014
    Inventors: Hironari Akashi, Terumasa Ide, Kousuke Tsuboi, Kiwamu Watanabe, Hidenori Kobayashi, Makoto Katayama, Yasushi Hayashi
  • Patent number: 7866957
    Abstract: A hermetic compressor has a bipolar permanent magnet motor where permanent magnet is disposed in rotor core. A hollow bore is disposed at the end on the compressing element side of the rotor core, and main bearing extends into the bore. The thickness of the rotor core is longer than that of the stator core, thereby widening the magnetic path of the rotor core. The magnetic flux amount generated in the rotor core, which is conventionally insufficient due to existence of the bore, increases, the loss decreases, and the efficiency increases.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: January 11, 2011
    Assignee: Panasonic Corporation
    Inventors: Hironari Akashi, Kosuke Tsuboi
  • Patent number: 7832994
    Abstract: A hermetic-type compressor according to the present invention has a viscous pump part by combining a spiral groove formed on the outer periphery of a main shaft with the inner periphery of a main shaft bearing, and at least one sliding section being in a sliding engagement with the main shaft bearing and at least one non-contact sliding-section having a predetermined gap with the main shaft bearing are formed on the face at the outer periphery of the main shaft opposing to the main shaft bearing where the lower end of the groove is located at the non-contact sliding-section.
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: November 16, 2010
    Assignee: Panasonic Corporation
    Inventors: Hironari Akashi, Kosuke Tsuboi
  • Publication number: 20100158721
    Abstract: Provided is a hermetic compressor in which an electric element having a stator and rotor provided therein and a compression element driven by the electric element are housed and the compression element includes a shaft which has a main shaft portion and an eccentric shaft portion, a cylinder block, a main shaft bearing which is formed in the cylinder block and supports the main shaft bearing of the shaft, a piston which reciprocates, a connection mechanism which connects the piston to the eccentric shaft portion, and a thrust-ball bearing, the thrust ball bearing having a plurality balls and a holder portion for holding the balls, and the holder portion being formed of polymer obtained by polycondensating diaminobutane and adipic acid.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 24, 2010
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Seigo Yanase, Akihiko Kubota, Atsushi Naruse, Kiwamu Watanabe, Hironari Akashi, Yoichiro Nakamura
  • Publication number: 20090092504
    Abstract: A hermetic compressor includes a hermetic container, a compression element accommodated in the hermetic container, and a motor element driving the compression element. The hermetic container has an inner space therein arranged to store lubrication oil. The compression element includes a shaft unit rotating about a rotation axis. The shaft unit has an oil-feeding passage provided therein. The oil-feeding passage extends upward from a lower end of the shaft unit. The shaft unit has an oil-spattering hole provided therein. The oil-spattering hole extends substantially perpendicularly to the rotation axis. The oil-spattering hole has a first open end communicating with the oil-feeding passage and a second open end opening in the inner space of the hermetic container. The second open end has a cross-sectional area smaller than a cross-sectional area of the first open end.
    Type: Application
    Filed: October 5, 2006
    Publication date: April 9, 2009
    Inventors: Hironari Akashi, Kosuke Tsuboi, Takahide Nagao
  • Publication number: 20080253909
    Abstract: The present invention provides a refrigerant compressor which may assure excellent reliability while using low-viscosity refrigerant. The refrigerant compressor is characterized in that the viscosity of oil stored in hermetic container ranges from VG3 to VG8, and the boiling component at 350 C or over is not less than 10% and not higher than 30% in volume ratio, and the boiling component at 300 C or less is not less than 50% and not higher than 70% in volume ratio. Accordingly, the input reduction at sliding surfaces can be realized, and the lubricant is evaporated, therefore it is possible to prevent defective compression caused by PET (polyethylene phthalate) or the like deposited on the surfaces of the discharge reed and the like, and to enhance the efficiency and reliability.
    Type: Application
    Filed: December 8, 2005
    Publication date: October 16, 2008
    Inventors: Hirotaka Kawabata, Hironari Akashi, Kazuhiro Yokota
  • Publication number: 20080247888
    Abstract: A hermetic compressor has a bipolar permanent magnet motor where permanent magnet (124) is disposed in rotor core (123). Hollow bore (131) is disposed at the end on the compressing element (105) side of rotor core (123), and main bearing (111) extends into bore (131). The thickness of rotor core (123) is longer than that of stator core (126), thereby widening the magnetic path of rotor core (123). The magnetic flux amount generated in rotor core (123), which is conventionally insufficient due to existence of bore (131), increases, the loss decreases, and the efficiency increases.
    Type: Application
    Filed: November 22, 2005
    Publication date: October 9, 2008
    Inventors: Hironari Akashi, Kosuke Tsuboi
  • Patent number: 7422423
    Abstract: A refrigerant compressor includes a compressor section, driver, a first contact section and a second contact section. The compressor section is accommodated in a closed container for compressing refrigerant gas. The driver drives the compressor section. The first and second contact sections are brought into contact with each other or they slide with each other by driving the compressor section. On the surface of each one of the contact sections, at least one of plural recesses uniformly placed or a mixed layer, to which molybdenum disulfide (MoS2) is bound, is formed. The foregoing structure allows increasing the abrasion resistance of the first and second contact sections.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: September 9, 2008
    Assignee: Matsushita Refrigeration Company
    Inventors: Hirotaka Kawabata, Takahide Nagao, Akihiko Kubota, Hironari Akashi, Kosuke Tsuboi, Takashi Kakiuchi, Makoto Katayama, Takeshi Kojima
  • Publication number: 20060147326
    Abstract: A hermetically sealed compressor includes a sealed vessel filled with a coolant and a freezer oil, an electromotive element including a rotor and a stator and accommodated within the sealed vessel, and a compressing element accommodated within an upper region of the sealed vessel and adapted to be driven by the electromotive element. This compressing element is provided with a shaft, arranged so as to extend vertically and having the rotor mounted thereon, and a bearing for supporting the shaft. A first oil pump is provided in a lower portion of the shaft and opening into the freezer oil, a second oil pump is provided above the first oil pump and formed by a spiral groove, provided on an outer periphery of the shaft, and an inner peripheral wall surface of the rotor, and a third oil pump is provided above the second oil pump and formed by a spiral groove, provided on the outer periphery of the shaft, and an inner peripheral surface of the bearing.
    Type: Application
    Filed: May 27, 2005
    Publication date: July 6, 2006
    Inventors: Takashi Kakiuchi, Hironari Akashi, Kosuke Tsuboi
  • Publication number: 20050265863
    Abstract: Relating to oil feed to a piston portion in a dual support bearing of a hermetic compressor, and a structure for improving efficiency and reliability and accomplishing reduction of noise is disclosed. In this structure, since an auxiliary bearing 119 is provided with an oil feed passage 129 for conducting lubricating oil 108 discharged from an upper end of an oil feed mechanism 114, to a sliding surface of a piston 120, the lubricating oil 108 is fed to the piston 120 and a piston pin 122 from the oil feed passage 129 to make the sealing performance excellent, so that the amount of leakage of refrigerant gas from a compression chamber 117 is reduced to improve the freezing capability or efficiency. Further, lubrication of sliding portions of the piston 120 and the piston pin 122 becomes excellent so that noise caused by sliding is reduced and the reliability is improved.
    Type: Application
    Filed: June 26, 2003
    Publication date: December 1, 2005
    Applicant: Matsushita Refrigeration Company
    Inventors: Hironari Akashi, Hirotake Kawabata, Akihiko Kubota, Takahide Nagao, Makoto Katayama, Kosuke Tsuboi, Takashi Kakiuchi, Takeshi Kojima
  • Publication number: 20050172646
    Abstract: A refrigerant compressor includes a compressor section, driver, a first contact section and a second contact section. The compressor section is accommodated in a closed container for compressing refrigerant gas. The driver drives the compressor section. The first and second contact sections are brought into contact with each other or they slide with each other by driving the compressor section. On the surface of each one of the contact sections, at least one of plural recesses uniformly placed or a mixed layer, to which molybdenum disulfide (MoS2) is bound, is formed. The foregoing structure allows increasing the abrasion resistance of the first and second contact sections.
    Type: Application
    Filed: December 15, 2003
    Publication date: August 11, 2005
    Applicant: Matsushita Refrigeration Company
    Inventors: Hirotaka Kawabata, Takahide Nagao, Akihiko Kubota, Hironari Akashi, Kosuke Tsuboi, Takashi Kakiuchi, Makoto Katayama, Takeshi Kojima
  • Publication number: 20040191094
    Abstract: A compressor includes a motor unit formed of a stator and a rotor, a compressor mechanism driven by the motor unit, and an enclosed container accommodating the foregoing elements. The compressor mechanism includes a cylinder block equipped with a compressing chamber and a piston. A shaft directly coupled to the rotor that drives the piston is supported by a double-sided bearing system, namely, a main bearing and a sub bearing. This structure allows preventing the shaft from slanting, and reducing a loss and a noise caused by sliding. As a result, a low profile, highly reliable and efficient compressor is obtainable.
    Type: Application
    Filed: December 19, 2003
    Publication date: September 30, 2004
    Inventors: Takeshi Kojima, Takashi Kakiuchi, Hirotaka Kawabata, Takahide Nagao, Kosuke Tsuboi, Hironari Akashi, Makoto Katayama, Akihiko Kubota