Patents by Inventor Haruhiko Takada
Haruhiko Takada 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: 4810177Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.Type: GrantFiled: October 13, 1987Date of Patent: March 7, 1989Assignee: Diesel Kiki Co., Ltd.Inventors: Tsuneori Shibuya, Yutaka Ishizuka, Haruhiko Takada, Teruo Nakamura, Hidehiko Takayama
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Patent number: 4776778Abstract: In a refrigerant compressor, a driving shaft is rotatably supported within a compressor housing by a bearing on a suction side. A trigger valve is provided in a passageway communicating a discharge pressure chamber with the bearing on the suction side. When pressure within the discharge pressure chamber is lower than a predetermined value, the trigger valve opens the passageway to permit gaseous refrigerant of high temperature within the discharge pressure chamber to be supplied to the bearing on the suction side.Type: GrantFiled: February 17, 1988Date of Patent: October 11, 1988Assignee: Diesel Kiki Co., Ltd.Inventors: Masahiro Iio, Haruhiko Takada, Mitsuya Ono, Teruo Nakamura
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Patent number: 4743184Abstract: A rotary compressor features a passage structure and valve arrangement which, under given modes of operation, permits relatively hot gaseous compressed working fluid to be introduced into a chamber proximate a bearing which is subject to cooling and the lubricant therein subject to dilution by working fluid under such conditions, in a manner to warm the bearing and its immediate surroundings and obviate the dilution problem.Type: GrantFiled: December 5, 1986Date of Patent: May 10, 1988Assignees: Nissan Motor Co., Ltd., Diesel Kiki Co., Ltd.Inventors: Seiji Sumikawa, Haruhiko Takada, Mikio Tanino, Kazuhiro Irie
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Patent number: 4717321Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.Type: GrantFiled: June 16, 1986Date of Patent: January 5, 1988Assignee: Diesel Kiki Co., Ltd.Inventors: Tsunenori Shibuya, Yutaka Ishizuka, Haruhiko Takada, Teruo Nakamura, Hidehiko Takayama
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Patent number: 4611977Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.Type: GrantFiled: August 13, 1984Date of Patent: September 16, 1986Assignee: Diesel Kiki Co., Ltd.Inventors: Tsunenori Shibuya, Yutaka Ishizuka, Haruhiko Takada, Teruo Nakamura, Hidehiko Takayama
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Patent number: 4571164Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.Type: GrantFiled: March 25, 1985Date of Patent: February 18, 1986Assignee: Diesel Kiki Co., Ltd.Inventors: Tsunenori Shibuya, Yutaka Ishizuka, Haruhiko Takada, Teruo Nakamura, Hidehiko Takayama
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Patent number: 4408969Abstract: A vane compressor is provided which includes a rotor which has an internal space formed at its central portion and communicating with a plurality of vane-inserted slits formed in its outer peripheral surface, and first and second axial through holes extending from the internal space to its opposite end surfaces. The drive shaft extends through an end wall member of the pump housing and has its end portion rigidly fitted in the first axial through hole of the rotor. The second axial through hole of the rotor receives a support shaft projecting from the other or opposite end wall member of the pump housing. Thus, the rotor is radially supported at its one end by the drive shaft and at its other end by the support shaft, respectively.Type: GrantFiled: May 20, 1981Date of Patent: October 11, 1983Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada
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Patent number: 4395203Abstract: A vane compressor is provided with a discharge rate control device which comprises valve means arranged to close part of the fluid suction passage leading to the pump working chambers to vary the opening of the fluid suction passage, and valve driving means for controlling the valve means. The valve means may be formed of at least one valve disposed to close an associated one of the inlet ports opening in the pump working chambers. The discharge rate control device may be arranged to be operated as a function of the rotational speed of the rotor of the compressor or the temperature of fluid being sucked into the compressor, which makes it possible, for instance, to keep the refrigerating capacity of an air conditioning system associated with the compressor at a substantially constant value.Type: GrantFiled: March 26, 1981Date of Patent: July 26, 1983Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada
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Patent number: 4209287Abstract: A rotor is eccentrically mounted in a bore of a housing and formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet passageway leading to an outlet port. The high pressure in the outlet passageway forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. In a first embodiment of the invention a check valve blocks the outlet port until the pressure in the outlet passageway reaches a level sufficient to sealingly press the vanes against the wall of the bore, thereby increasing the speed of pressure buildup in the outlet passageway.Type: GrantFiled: January 18, 1978Date of Patent: June 24, 1980Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada
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Patent number: 4135865Abstract: A rotor is eccentrically mounted in a bore of a housingand formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet passageway leading to an outlet port. The high pressure in the outlet passageway forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. In a first embodiment of the invention a check valve blocks the outlet port until the pressure in the outlet passageway reaches a level sufficient to sealingly press the vanes against the wall of the bore, thereby increasing the speed of pressure buildup in the outlet passageway.Type: GrantFiled: August 4, 1976Date of Patent: January 23, 1979Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada
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Patent number: 4086041Abstract: A rotor is eccentrically mounted in a bore of a housing and formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet. The high pressure in the outlet forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. A check valve at the inlet closes when the compressor is stopped to prevent discharge of fluid and oil out the inlet. An equalizing valve acting integrally with the check valve connects the inlet to the outlet when the compressor is stopped to prevent oil from filling the inlet.Type: GrantFiled: August 4, 1976Date of Patent: April 25, 1978Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada
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Patent number: 3988080Abstract: A rotary vane compressor in which the pressure difference between inlet and outlet passages is utilized to accomplish lubrication without a supplementary oil pump comprises a housing with a cylindrical bore, a hollow rotor eccentrically rotatable on a shaft in the bore and at least one vane radially slidable in a slot in the rotor and sealingly engaging with the inner surfaces of the bore to define fluid chambers of varying volume. The compressor further has inlet and outlet passages communicating with the bore and an oil sump disposed below the bore. A first passageway connects the outlet passage with the sump, and the hollow of the rotor constitutes a second passageway. A third passageway connects the sump with one end of the hollow and a fourth passageway connects the other end of the hollow with the inlet passage.Type: GrantFiled: February 18, 1975Date of Patent: October 26, 1976Assignee: Diesel Kiki Co., Ltd.Inventor: Haruhiko Takada