Patents by Inventor Masaharu Hiraga

Masaharu Hiraga 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: 4880360
    Abstract: A reciprocating piston type refrigerant compressor is disclosed. The compressor includes a housing having a cylinder block provided with a plurality of cylinders and a crank chamber adjacent the cylinder block. A piston slides within each cylinder and is reciprocated by a drive mechanism which includes a rotary drive shaft, a rotor mounted on the drive shaft, and a coupling mechanism which converts the rotary motion of the rotor into the reciprocating motion of the pistons. The coupling mechanism includes an inclined member which has an inclined surface disposed at an adjustable incline angle. Accordingly, the stroke of the pistons within the cylinders can be changed by adjusting the incline angle of the inclined surface in response to the change of pressure in the crank chamber.
    Type: Grant
    Filed: May 18, 1988
    Date of Patent: November 14, 1989
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Terauchi, Masaharu Hiraga
  • Patent number: 4824346
    Abstract: A scroll-type fluid displacement apparatus, in particular, a compressor unit is disclosed. The unit includes a housing with a fluid inlet port and a fluid outlet port. A fixed scroll with first end plate and first spiral element is fixedly disposed in the housing. An orbiting scroll with a second end plate and a second spiral element is disposed for orbiting motion in the housing. The first and second spiral elements interfit with one another at an angular offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. A drive pin extends from an inner end of a drive shaft. The orbiting scroll has a boss which rotatably supports a bushing. An eccentric hole is formed in the bushing and the drive pin is received within this hole.
    Type: Grant
    Filed: March 18, 1981
    Date of Patent: April 25, 1989
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Kiyoshi Terauchi, Kiyosh Miyazawa, Seiichi Sakamoto
  • Patent number: 4753583
    Abstract: A scroll type fluid compressor including a housing, a pair of scroll elements each comprising an end plate and a spiral wrap means projecting from one surface of the end plate. Both wrap means are interfitted to make a plurality of line contacts and are formed with a groove on the end surface of each wrap means which receives a seal element. Each groove is formed with its center line inward of the center line of its respective spiral wrap. This construction prevents the walls of the groove from prematurely deteriorating and causing attendant destruction of the scroll elements.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: June 28, 1988
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Tamotsu Daikohara
  • Patent number: 4627800
    Abstract: A scroll type fluid displacement apparatus is disclosed which includes a pair of scrolls each having a circular end plate and spiral element extending therefrom. The scrolls are maintained at an angular and radial offset so that both spiral elements interfit to form a plurality of line contacts to define at least one pair of sealed off fluid pockets. Upon relative orbital motion of the scrolls, the line contacts shift along the spiral curved surfaces of the spiral elements to thereby change the volume of the fluid pockets. In particular, according to the present invention, the thickness of the spiral element of the orbiting scroll is gradually from the inner end of the spiral element to its outer end to increase the mechanical strength of the spiral element at its central portion while avoiding an increase in the centrifugal force generated by the orbiting scroll during orbital motion. On the other hand, the thickness of the spiral element of the other scroll, i.e.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: December 9, 1986
    Assignee: Sanden Corporation
    Inventors: Yasuyuki Matsudaira, Masaharu Hiraga
  • Patent number: 4600367
    Abstract: A refrigerant compressor for automobile air-conditioning system is disclosed. The compressor comprises a front end plate member and a cylindrical casing attached to an end surface of the front end plate member. A polygonal shaped portion is formed on the outer peripheral surface of the front end plate member and a plurality of projections are formed on an opposite end of the housing from the polygonal shaped portion. The end surfaces of the projections are aligned on the same plane with each end surface of polygonal shaped portion. The end surfaces of the projections and the polygonal shaped portion have tapped holes for attaching mounting brackets. Therefore, a variety of suitable mounting arrangements can be used to mount the compressor and the mounting angle of the compressor can be adjusted.
    Type: Grant
    Filed: April 6, 1984
    Date of Patent: July 15, 1986
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Terauchi, Yasuhiro Kubo, Masaharu Hiraga
  • Patent number: 4586874
    Abstract: A reciprocating piston type refrigerant compressor includes a compressor housing having a cylinder block provided with a plurality of cylinders and a crank chamber adjacent the cylinder block. A piston slides within each cylinder and is reciprocated by a wobble plate driven by a cam rotor mounted on a drive shaft. The cam rotor includes an adjustable slant plate with a sloping surface at an adjustable slant angle in close proximity to the wobble plate. Accordingly, the stroke of the pistons within the cylinders can be changed by adjusting the slant angle of the sloping surface. The slant angle of the sloping surface is adjusted in response to the change of pressure in the crank chamber. The crank chamber communicates with the suction chamber through a passageway and a valve control mechanism controls the opening and closing of the passageway.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: May 6, 1986
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Tamotsu Daikohara
  • Patent number: 4580956
    Abstract: A fluid displacement apparatus is disclosed. The fluid displacement apparatus includes a housing, a fixed fluid displacement member and an orbiting fluid displacement member having an end plate from which an orbiting wall extends. The orbiting member interfits with the fixed member to make a plurality of line contacts to define at least one sealed-off fluid pocket. A drive shaft is rotatably supported by the housing, and has a drive pin which is radially offset from the axis of the drive shaft. The end plate of orbiting piston member has a boss, and bushing is rotatably supported within the boss. The bushing has an eccentric hole disposed eccentrically with respect to the center of the bushing, and the drive pin is inserted in the eccentric hole. A restriction device restricts the swing angle of the bushing and is coupled between the drive shaft and the bushing.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: April 8, 1986
    Assignee: Sanden Corporation
    Inventors: Kazunari Takahashi, Masaharu Hiraga
  • Patent number: 4551078
    Abstract: A scroll type fluid displacement apparatus, in particular, a compressor unit is disclosed. The unit includes a housing, a pair of scroll members which are comprised of an end plate and a spiral wrap extending from one surface of the end plate. Both wraps interfit to make a plurality of line contacts between their spiral curved surfaces. A driving mechanism and a rotation preventing mechanism are connected to one of the scroll members to effect relative orbital motion while rotation of the scroll member is prevented. A turning mechanism is associated with one of the scroll members to selectively turn the scroll member and vary the angular offset between the wraps, whereby the compressive effect of the scroll members can be controlled independently of the operation of the driving mechanism.
    Type: Grant
    Filed: October 9, 1981
    Date of Patent: November 5, 1985
    Assignee: Sanden Corporation
    Inventor: Masaharu Hiraga
  • Patent number: 4551081
    Abstract: A fluid displacement apparatus is disclosed. The apparatus includes a housing having a front end plate, a fixed member and an orbiting piston member. The fixed and orbiting piston members interfit to make a plurality of line contacts to define a sealed off fluid pocket. A driving mechanism, including a drive shaft, is disposed within the housing and is operatively connected to the orbiting piston member to effect the orbital motion of the orbital piston member by the rotation of the drive shaft. The drive shaft is rotatably supported by the front end plate through a bearing. An annular sleeve projecting axially from a front end surface of the front end plate surrounds the drive shaft. A pulley member is fixed on an axial end of the drive shaft which extends from the sleeve and is rotatably supported by the sleeve through a bearing on the outer surface of the sleeve.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: November 5, 1985
    Assignee: Sanden Corporation
    Inventors: Tadashi Sato, Masaharu Hiraga
  • Patent number: 4548555
    Abstract: A scroll type fluid displacement apparatus including a housing and a pair of scrolls having interfitting spiral wraps which undergo relative orbital motion to make moving line contacts and define sealed off moving fluid pockets of changing volume. The center portion of at least one of the wraps is higher than the remaining portion thereof. The center portion extends substantially from the inner end of the spiral wrap outwardly at least to the location of the line contact between the curved surfaces of the wraps when the innermost pair of fluid pockets are merged into a single fluid pocket to form the high pressure space near the center of the scrolls. This construction prevents abnormal wear of the spiral wrap and the opposite end plate which might otherwise occur during axial slant of the orbiting scroll, or which might be caused by non-parallelism of the scroll end plates, without compromising the important sealing of the central high pressure space.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: October 22, 1985
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Yuji Yoshii
  • Patent number: 4547137
    Abstract: A scroll type compressor has interfitting spiral elements with thickened inner end portions which are stronger than the inner end portions of conventional spirals, and minimize the re-expansion volume of the working fluid. The inner end portions are comprised of arcuate surfaces which deviate from the involute curves of the remainder of the spiral elements.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: October 15, 1985
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Terauchi, Masaharu Hiraga
  • Patent number: 4540355
    Abstract: A scroll-type fluid displacement apparatus is disclosed having a pair of scroll members each comprising an end plate and a spiral wrap extending from one side of the end plate. The spiral wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed-off fluid pockets. At least one of the scroll members has a discharge port or fluid hole near the center of the spiral element and is provided with an anti-wear plate on its end surface facing the other scroll member. The anti-wear plate is an involute plate that covers substantially the area of the end surface of the end plate on which the spiral wrap of the other scroll member makes contact during the orbital motion of the orbiting scroll member. The radially inner end of the anti-wear plate is spaced from the discharge port to avoid blocking the discharge flow or covering the discharge port. Therefore, the undesirable vibration of the anti-wear plate by fluid flowing through the port is avoided.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: September 10, 1985
    Assignee: Sanden Corporation
    Inventors: Masakatsu Sakaki, Masaharu Hiraga
  • Patent number: 4514150
    Abstract: A scroll type compressor including a housing, a fixed scroll which is joined to the housing and including a first end plate from which a first wrap extends and an orbiting scroll which includes a second end plate from which a second wrap extends. The wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. The first end plate is formed with a plurality of pairs of holes, the holes of each pair of holes being placed at symmetrical positions. The most inwardly placed hole is placed at a location defined by involute angles within the area defined by .phi.end-2(n-1).pi.>.phi.1>.phi.end-2n , where .phi.end is the final involute angle of the wrap which extends from the end plate having the holes, .phi.1 is the involute angle at which the hole is placed and n is the amount of pairs of holes. The most outwardly placed hole is placed at a location defined by involute angles within the area defined by .phi.n-1+2.pi.>.phi.n>.
    Type: Grant
    Filed: December 10, 1982
    Date of Patent: April 30, 1985
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Atsushi Mabe, Yuji Yoshii
  • Patent number: 4498852
    Abstract: A scroll type fluid displacement apparatus having a pair of interfitting, relatively orbiting scroll members which define a plurality of moving fluid pockets. A fluid passage through the end plate of one of the scroll members has an elongated shape to reduce contact of the axial end of the other scroll member with the edge of the fluid passage, thereby reducing wear and improving volumetric efficiency.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: February 12, 1985
    Assignee: Sanden Corporation
    Inventor: Masaharu Hiraga
  • Patent number: 4490099
    Abstract: A scroll type fluid displacement apparatus including a housing, a pair of scroll members each comprising an end plate and a spiral wrap means projecting from one surface of the end plate. Both wrap means are interfitted to make a plurality of line contacts between them, and a driving mechanism including a drive shaft is connected to one of the scroll members to effect orbital motion thereof relative to the other (fixed) scroll member while rotation of the orbiting scroll is prevented. The center portions of the wrap means are made thicker than the remaining portions thereof, the center portions extending substantially from the inner ends of the wrap means outwardly at least throughout the portions thereof which contact one another when the two innermost fluid pockets are merged into a single fluid pocket to form the high pressure space near the center of the scroll members.
    Type: Grant
    Filed: April 3, 1984
    Date of Patent: December 25, 1984
    Assignee: Sanden Corporation
    Inventors: Kiyoshi Terauchi, Masaharu Hiraga
  • Patent number: 4487248
    Abstract: A method and tool for manufacturing a scroll for use in a scroll type fluid displacement apparatus is disclosed.
    Type: Grant
    Filed: July 23, 1982
    Date of Patent: December 11, 1984
    Assignee: Sanden Corporation
    Inventors: Eiji Fukushima, Seiichi Fukuhara, Masaharu Hiraga
  • Patent number: 4477239
    Abstract: A scroll type fluid displacement apparatus including a housing with a fluid inlet port and fluid outlet port is disclosed. A fixed scroll is joined with the housing and has a first circular end plate from which a first wrap extends. An orbiting scroll has a second circular end plate from which a second wrap extends. The first and second wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. A driving mechanism, which includes a drive shaft, is operatively connected to the orbiting scroll to effect the orbital motion of the orbiting scroll at radius Ror, while the rotation of the orbiting scroll is prevented by a rotation preventing/thrust bearing device, whereby the fluid in the fluid pockets moves inwardly or outwardly and changes in volume.
    Type: Grant
    Filed: October 12, 1982
    Date of Patent: October 16, 1984
    Assignee: Sanden Corporation
    Inventors: Yuji Yoshii, Masaharu Hiraga
  • Patent number: 4474543
    Abstract: A rotation preventing/thrust bearing device for an orbiting member of a fluid displacement apparatus is disclosed. The rotation preventing/thrust bearing device includes a discrete fixed portion, a discrete orbital portion and bearing elements. The fixed and orbital portions each include an annular race and a ring which covers the end surface of the race. Both rings have a plurality of holes or pockets in an axial direction. The radius of the fixed pockets is greater than the radius of the orbital pockets. The bearing elements, one of which is placed between each opposing pair of pockets, roll at radius R1 with regard to the fixed race and roll at radius R2 with regard to the orbital race. The sum of rolling radii R1 and R2 is substantially equal to the radius of the orbiting member.
    Type: Grant
    Filed: March 23, 1982
    Date of Patent: October 2, 1984
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Takayuki Iimori, Seiichi Sakamoto
  • Patent number: 4468178
    Abstract: A scroll type compressor is disclosed. The compressor includes a housing. A fixed scroll is joined to the housing and includes a first end plate from which a first wrap extends. An orbiting scroll also includes second end plate from which a second wrap extends. The wraps interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of sealed off fluid pockets. The first end plate is formed with at least two holes which are placed at the symmetrical positions. A first of the holes is placed at a location, defined by involute angles, within the area defined by .phi. end >.phi.1>.phi. end-2.pi., where .phi.0 end is the final involute angle of the wrap which extends from the end plate having the holes, and .phi. 1 is the involute angle at which the first hole is placed. The second hole is located at an involute angle approximately .phi.1-.pi.. A control mechanism controls the opening and closing of the holes to thereby control the capacity of compressor.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: August 28, 1984
    Assignee: Sanden Corporation
    Inventors: Masaharu Hiraga, Atsushi Mabe, Yuji Yoshii
  • Patent number: 4466784
    Abstract: A scroll type fluid displacement apparatus is disclosed. The apparatus includes a housing having a front end plate and a scroll housing. A fixed wrap extends into an operative interior area of the housing from an inner end surface of an end plate portion of the scroll housing. An orbiting scroll member has an end plate from which an orbiting wrap extends, and a tubular member axially projecting from the end surface of end plate into the operative interior area of the housing. The tubular member has a hollow interior. A drive shaft is rotatably supported by the front end plate and a crank pin extends from its inner end surface. The crank pin is rotatably carried within the hollow interior of the tubular member through a bearing assembly to thereby rotatably support the orbiting scroll.
    Type: Grant
    Filed: March 3, 1982
    Date of Patent: August 21, 1984
    Assignee: Sanden Corporation
    Inventor: Masaharu Hiraga