Patents by Inventor Toshinori Aihara
Toshinori Aihara 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: 6041883Abstract: A power steering system includes a fluid pump, a steering gear, a high-pressure passage connecting the fluid pump to the steering gear, and a flow control valve having a first chamber forming a part of the high-pressure passage. A metering orifice is disposed in the high-pressure passage between the first chamber and the steering gear. A feedback passage distributes feedback pressure developed in the high-pressure passage downstream of the metering orifice to a second chamber of the flow control valve. An exhaust port communicates with the first chamber. A movable valve spool is disposed in a valve bore and has one end exposed to the first chamber and opposite end exposed to the second chamber. A valve spring is disposed in the second chamber together with a slide coupled with an external actuator. One end of the valve spring is seated on the opposite end of the valve spool and opposite end thereof is seated on the slide.Type: GrantFiled: March 10, 1997Date of Patent: March 28, 2000Assignee: Unisia Jecs CorporationInventors: Tadaharu Yokota, Tatsuyoshi Maruyama, Norihiro Saita, Toshinori Aihara
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Patent number: 6035958Abstract: A steering power assist apparatus is comprised of a power cylinder whose operation is controlled by the a flow rate control valve, a first control valve and a second control valve. The flow rate control valve is connected to a discharge side of a hydraulic pump and controls the amount of the hydraulic oil to be supplied to the first and second control valves according to a load pressure. The first control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil supplied to the second control valve according to a steering torque. The second control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil to the power cylinder according to a steering torque. The choke valves of the second control valve are fully closed after the choke valves of the first control valve are fully closed.Type: GrantFiled: February 13, 1997Date of Patent: March 14, 2000Assignee: Unisia Jecs CorporationInventors: Norihiro Saita, Tatsuyoshi Maruyama, Toshinori Aihara, Tadaharu Yokota
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Patent number: 5975232Abstract: A power assisted steering apparatus for a vehicle has a driving source and an actuator for the vehicle's steering mechanism, to power assist the steering operation. The driving source, such as an engine, continuously drives a pump. A working passage is arranged so that working oil discharged from the pump is introduced into the actuator. A check valve is disposed in the working passage, between the actuator and the pump so that the working oil flows only one way to the actuator. An accumulator is connected to the working passage, between the check valve and the actuator to maintain a predetermined pressure in the working passage. A regulator is connected to the working passage, between the pump and the check valve to regulate flow to the actuator. When the pressure within the working passage reaches the predetermined pressure, the working fluid is dumped to a reservoir, bypassing the check valve, the accumulator, and the actuator.Type: GrantFiled: January 7, 1997Date of Patent: November 2, 1999Assignee: Unisia Jecs CorporationInventors: Koichi Komatsu, Tatsuyoshi Maruyama, Tadaharu Yokota, Toshinori Aihara, Norihiro Saita
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Patent number: 5950757Abstract: A power steering device includes a hydraulic pump for discharging working fluid, an actuator for producing a steering assisting force by means of working fluid, a hydraulic passage for connecting the hydraulic pump and the actuator, a check valve arranged to the hydraulic passage to allow flow of working fluid from the hydraulic pump to the actuator and preventing flow thereof in the opposite direction, an accumulator connected to the hydraulic passage downstream of the check valve, a pressure switch for detecting a pressure within the hydraulic passage downstream of the check valve, a control unit for controlling the hydraulic pump in response to the pressure switch, and a display for showing an anomaly of the power steering device. When determining the anomaly of the power steering device, the control unit stops the hydraulic pump and/or makes the display show the anomaly.Type: GrantFiled: November 19, 1997Date of Patent: September 14, 1999Assignee: Unisia Jecs CorporationInventors: Norihiro Saita, Takayuki Yoshida, Tatsuyoshi Maruyama, Tadaharu Yokota, Toshinori Aihara
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Patent number: 5921342Abstract: A power assisted steering apparatus for a vehicle having a driving source, such as an engine, has an actuator, a hydraulic pump, a working oil pressure passage, and a drive switch. The actuator, which is in the vehicle steering mechanism, receives a supply or exhaust of a working oil to assist the steering operation. The pump is selectively driven by an engine via a clutch mechanism. The working oil discharged from the pump is introduced into the actuator via the passage. The check valve is interposed within the passage to enable flow in one direction away from the pump. The drive switch structure is disposed within the passage, downstream from the check valve. With this arrangement, the drive switch structure can be activated by pressure in the passage downstream of the check valve to control the clutch mechanism.Type: GrantFiled: January 16, 1997Date of Patent: July 13, 1999Assignee: Unisia Jecs CorporationInventors: Tatsuyoshi Maruyama, Norihiro Saita, Tadaharu Yokota, Toshinori Aihara, Yukio Uchida
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Patent number: 5125804Abstract: A variable-delivery vane-type rotary compressor including receiving means for defining a space for rotatably receiving a disc-shaped rotary closure member, which is associated with one of the end openings of a by-pass passage, within the end wall of a compression chamber. The receiving means may also be provided on the peripheral wall of the compression chamber. The bearing means is provided between the rotary closure member and the end wall of the compression chamber.Type: GrantFiled: May 6, 1991Date of Patent: June 30, 1992Assignee: Atsugi Motor Parts Co., Ltd.Inventors: Seiji Akaike, Toshinori Aihara, Yukio Sudo
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Patent number: 5049052Abstract: A vane-type rotary compressor employs a cam ring made of an aluminium type metal which is different from the metal to form a rotor and rotor vanes and has a linear expansion coefficient selected to be greater than that of the metal of the rotor and vanes so as to compensate temperature difference therebetween.Type: GrantFiled: April 13, 1989Date of Patent: September 17, 1991Assignee: Atsugi Motor Parts Company, LimitedInventor: Toshinori Aihara
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Patent number: 5035584Abstract: A variable-delivery vane-type rotary compressor including receiving means for defining a space for rotatably receiving a disc-shaped rotary closure member, which is associated with one of the end openings of a by-pass passage, within the end wall of a compression chamber. The receiving means may also be provided on the peripheral wall of the compression chamber. The bearing means is provided between the rotary closure member and the end wall of the compression chamber.Type: GrantFiled: October 28, 1987Date of Patent: July 30, 1991Assignee: Atsugi Motor Parts Co., Ltd.Inventors: Seiji Akaike, Toshinori Aihara, Yukio Sudo
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Patent number: 5030066Abstract: A variable-delivery vane-type rotary compressor includes passage means for defining a by-pass passage establishing communication between an aspirator chamber and a compression chamber, the by-pass passage having end openings exposed to the aspirator chamber and the compression chamber; and control means for mechanically controlling the amount of fluid by-passed from the compression chamber to the aspirator chamber through the passage means in accordance with pressure in the aspirator chamber and a discharge chamber.Type: GrantFiled: September 21, 1987Date of Patent: July 9, 1991Assignee: Atsugi Motor Parts Co., Ltd.Inventors: Toshinori Aihara, Yukio Sudo
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Patent number: 5026257Abstract: In a variable displacement vane-type rotary compressor, a rotational displacement of an adjust member relative to a front member fixedly closing a front end of a cam ring varies a compression starting point of a rotary vane in a working chamber formed in the cam ring. The front member is formed with an induction port and a bypass port, and the adjust member is formed with a bypass recess. The induction port and the bypass recess are in communication with each other in the working chamber irrespective of a position of the vane under all of the rotational displacement of the adjust plate to establish a communication between the induction port and the bypass port in the working chamber irrespective of the position of the vane when the bypass port overlaps with the bypass recess.Type: GrantFiled: September 14, 1989Date of Patent: June 25, 1991Assignee: Atsugi Unisia CorporationInventors: Toshinori Aihara, Masahiko Hara
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Patent number: 5020975Abstract: In a variable-delivery vane-type rotary compressor, a rotational displacement of an adjust member relative to a front member fixedly closing a front end of a cam ring varies a compression starting point of a rotary vane in a working chamber formed in the cam ring. The rotational displacement of the adjust member is controlled by an adjust member actuating unit in response to a pilot pressure applied to the adjust member actuating unit from a pilot pressure applying unit. The pilot pressure applying unit includes a first passage communicating the adjust member actuating unit with a valve unit, a second passage communicating an induction chamber with the valve unit, and a third passage communicating a discharge chamber with the valve unit.Type: GrantFiled: August 21, 1989Date of Patent: June 4, 1991Assignee: Atsugi Motor Parts Company, LimitedInventor: Toshinori Aihara
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Patent number: 4859154Abstract: A variable-delivery vane-type rotary compressor includes means for controlling discharge by-passed from an actuating chamber and an inhalator chamber by changing area of opening provided between a front plate and a cam ring. The means can control discharge by rotation of a disc having at least one by-pass opening. The disc can rotate in accordance with signals produced from at least one sensor.Type: GrantFiled: August 5, 1987Date of Patent: August 22, 1989Assignee: Atsugi Motor Parts Co., Ltd.Inventors: Toshinori Aihara, Yukio Sudo