Patents Represented by Attorney Ernest A. Beutler

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  • Induction system for engine
    Patent number: 6510837
    Abstract: A number of embodiments of cylinder head and intake port arrangements for multiple valve, internal combustion engines particularly those having three or more intake valves. The configuration promotes turbulence in the combustion chamber by inducing a tumble action even from the center intake valve seat. In addition, each of the valve seats and its associated flow passages are configured so as to provide optimum tuning for different engine speeds so as to improve the torque of the engine throughout its entire speed and load ranges and to provide good breathing efficiency throughout all engine speeds. Various porting and throttle and fuel injection systems are shown wherein siamesed intake passages are formed for at least two of the valve seats.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: January 28, 2003
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Tateo Aoyama
  • DC motor
    Patent number: 6509662
    Abstract: A DC motor which is small in size and capable of effecting a higher output, and in which magnet size is determined through a parameter by which the peak output characteristic corresponding to the shape and size of the yoke can be recognized properly.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: January 21, 2003
    Assignee: Kabushiki Kaisha Moric
    Inventors: Akira Suzuki, Yoshikazu Kurita
  • Combustion chamber for direct injection engine
    Patent number: 6508226
    Abstract: An improved combustion chamber configuration for a direct injected internal combustion engine. The cylinder head recess and piston head are configured so as to provide a small clearance volume and accordingly high compression ratios while the shape of the piston head and the arrangement of the cylinder head recess permits a portion of the injected fuel to be directed toward the exhaust valves to cool them and reduce smoke and increase fuel efficiency.
    Type: Grant
    Filed: September 21, 2001
    Date of Patent: January 21, 2003
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Daijirou Tanaka, Shinichi Kurosawa
  • In-cylinder injection gasoline engine
    Patent number: 6499457
    Abstract: A number of combustion chamber configurations for direct injected engines wherein the fuel injectors inject at least two fuel patches in circumferentially spaced locations. This fuel is injected into a cavity arrangement formed in the head of the piston, which directs the fuel upwardly toward a pair of circumferentially spaced spark plugs so as to insure complete combustion within the combustion chamber. Embodiments having single and paired cavities in the piston head are disclosed.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: December 31, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yuichi Suzuki, Uichitake Uchiyama
  • Meter display device for saddle type vehicle
    Patent number: 6484836
    Abstract: An improved instrument display for a saddle type vehicle wherein the display is mounted in a recess in the handlebar cover in an adjustable manner to be effectively viewed by riders of widely varying stature. Two embodiments of adjustment mechanisms are disclosed.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: November 26, 2002
    Assignee: Kabushiki Kaisha Moric
    Inventor: Mitsuru Tsuji
  • High-low speed range switching type valve mechanism for internal combustion engine
    Patent number: 6481398
    Abstract: Several embodiments of variable valve lift mechanisms employing rocker arms that cooperate with high and low speed cam lobes and which are selectively coupled or uncoupled so as to operate the valve dependent upon either the low speed cam lobe configuration or the high speed cam lobe configuration. The construction is such that there are no bending loads placed on the valve stems and the actuating mechanism is relatively light and can be carried at least in part independently of the rocker arms so as to reduce the reciprocating masses and improve engine performance.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: November 19, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Shigenobu Uchiyama
  • Power system for electric vehicle
    Patent number: 6483272
    Abstract: In a motorized vehicle power system 403 provided with a rechargeable battery 400, a battery control unit 401 for executing control of battery conditions including the remaining capacity of the rechargeable battery 400 and a charging unit 402 for charging the rechargeable battery 400, the charging unit 402 is provided with a discharging device 404 for executing refreshing discharge of the rechargeable battery 400 and a discharge control device 405 for controlling the refreshing discharge by the charging device 404 on the basis of a refreshing discharge requirement signal sent from the battery control unit 401.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: November 19, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Junji Terada, Toshiaki Yamada
  • Variable valve drive system for an internal combustion engine
    Patent number: 6481397
    Abstract: A Variable valve lift mechanism that minimizes the number of components and also which permits a greater latitude of valve lift adjustment including the possibility of no valve lift under some running conditions. This is done without interference with other components of the engine and thus permits a compact engine assembly.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: November 19, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Atsushi Suzuki
  • Method of forming a camshaft for an engine
    Patent number: 6467166
    Abstract: A multi-valve internal combustion engine having a plurality of valves having skewed axes that are operated by cam lobes of a single cam shaft. The cam shaft operates the valves through rocker arms each of which are pivoted independently about axes that are skewed relative to the cam shaft axis so as to minimize bending stresses on the valve during its actuation. This also avoids scuffing between the rocker and the valve stem. At the same time, good contact is maintained between the cam lobe and the follower surface by machining the cam lobe so that it will have a slight concavity at least in its tip portion so as to ensure constant line contact with the follower.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: October 22, 2002
    Assignee: Yamaha Hatsudoki Kanushiki Kaisha
    Inventors: Yuji Saiki, Naoki Tsuchida, Mitsuo Tsuchiya
  • Permanent magnet 2-phase DC brushless motor
    Patent number: 6465973
    Abstract: Several embodiments of improved 2-phase DC brushless motors. In each embodiment, there are pluralities of windings and the current flow through the windings is controlled by a reduced number of main switches from the prior art type of devices. In accordance with a feature of certain embodiments, pair of windings are provided with a common CT that detects the current flowing through the connected pair of windings and which functions to control the main switching device in a pulse width modulated manner. As a result, the control circuit can be simplified and reduced in cost without sacrificing performance.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: October 15, 2002
    Assignee: Kabushiki Kaisha Moric
    Inventors: Takashi Kato, Tadashi Takano, Junetsu Hayashi
  • Overcurrent protection device
    Patent number: 6465983
    Abstract: At Step Sb3, a duty factor, which was calculated at Step Sb2 on the basis of a data for a feed-back control, is compared with a limit value of the duty factor. If the duty factor is less than the limit value, a pulse for the PWM control is modulated to have the calculated duty factor at Step Sb4. If the duty factor is greater than the limit value, the pulse for the PWM control is modulated to have the duty factor of the limit value at Step Sb5. Accordingly, the duty factor provided for a current value instruction is not in excess of the limit value, so that the secondary battery is prevented from discharging overcurrent in excess of the limit current which can be discharged from the secondary battery. Accordingly, although the capacitance of the secondary battery is not large, the lifetime of the secondary battery is prevented from being shortened.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: October 15, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hiroaki Ogata, Masaya Suenari, Mikio Saito
  • High pressure fuel pump
    Patent number: 6460407
    Abstract: A number of embodiments of direct injected V-type outboard motors provided with a very effective fuel supply system wherein the number of components can be significantly reduced as well as the elimination of many of the flexible conduits normally employed. This also permits the fuel system to be assembled as a relatively unitary assembly that can be then affixed to the engine. The arrangement is such that purging of the system from vapors during shutdowns is easily accomplished and the system can be purged without complicated construction. Furthermore, the system can be pressure tested by an arrangement where the low pressure system can bypass the high pressure system when the engine is not operating so as to be pressurized for testing purposes. However, when the high pressure system operates, then the bypass line will be closed by the shunting valve arrangement.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: October 8, 2002
    Assignee: Sanshin Kogyo Kabushiki Kaisha
    Inventor: Masahiko Kato
  • Oil pump layout structure for internal combustion engine
    Patent number: 6460503
    Abstract: An improved oil pump drive arrangement and pressure relief valve therefore for an internal combustion engine. The oil pump is disposed externally of the engine around a shaft that extends through the body of the engine. This extending portion of the shaft drives at least one engine accessory through a pulley which axially overlaps and circumferentially surrounds the oil pump housing to provide a compact engine construction.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: October 8, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Yuji Kinoshita, Tomotaka Takano, Yukihiro Kitagawa
  • Power supply system for electric vehicle
    Patent number: 6456041
    Abstract: A power source system 402 for electric motor-operated vehicles adapted to determine an actual capacity of a chargeable battery 400, namely the maximum capacity learning value at the current time point after it is used in cycles, comprises; a discharge means 403 for performing refreshment discharge of the chargeable battery 400, a charge control means 404 for controlling the discharge means 403 to perform the refreshment discharge with a discharge current including a pulse waveform portion, and an actual capacity learning means 405 for learning the actual capacity of the chargeable battery 400 on the basis of discharge capacity including the discharge capacity at the time of refreshment with the pulse waveform current.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: September 24, 2002
    Assignee: Yamaha Hatsudoki Kanushiki Kaisha
    Inventors: Junji Terada, Satoshi Yamamoto
  • Supercharged engine
    Patent number: 6453890
    Abstract: A compact supercharged internal combustion engine, wherein the supercharger is mounted above the twin overhead cam cylinder head of the engine but is readily detachable from it. The drive for the pumping elements of the supercharger including counter rotating shafts to which balance masses are added so as to assist in engine balancing. In addition to supplying compressed air to the combustion chambers of the engine for combustion, the supercharger also supplies air to an air injection system that cooperates with the exhaust system for reducing the emissions of undesirable pollutants to the atmosphere.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: September 24, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Hidetoshi Kageyama, Nobuaki Karaki
  • Jet propulsion system for watercraft
    Patent number: 6431925
    Abstract: A jet propelled watercraft having an improved extension assembly for dampening pulsations from the impeller of the jet propulsion unit and also an improved exhaust system having a separate idle discharge for permitting lower idle speeds without restriction of the idle exhaust gas flow.
    Type: Grant
    Filed: August 2, 2000
    Date of Patent: August 13, 2002
    Assignee: Sanshin Kogyo Kabushiki Kaisha
    Inventors: Kazumasa Ito, Tetsuya Ishino
  • Intake control device for multi-cylinder V-type engine
    Patent number: 6408809
    Abstract: An improved compact and highly efficient variable tuned intake system for a V-type, multi-cylinder engine. The induction system provides variable tuning length with both the high speed and low speed inlets being directed away from the valley between the cylinder banks to minimize the change in the flow directions into the combustion chambers.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: June 25, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Minoru Suzuki
  • Balancer shaft for internal combustion engine
    Patent number: 6405702
    Abstract: An internal combustion engine having a crankshaft, at least one camshaft, a balancer shaft and a timing drive for driving the camshaft and the balancer shaft from the crankshaft. The balancer shaft has a drive member that is interposed in the timing drive and a torsional vibration damper that is interposed between this drive member and the balancer masses on the balancer shaft to avoid transmission of crankshaft vibrations to the balancer shaft without effecting the valve timing. balancer shaft is provided that has at least offset balance masses formed thereon. The balancer shaft is also formed with integral bearings directly on opposite sides of each of the balance masses.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: June 18, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Tomotaka Takano, Kaoru Okui, Yasuyuki Matsuno
  • Fuel injection device for engine
    Patent number: 6394072
    Abstract: A high pressure fuel injection system for an internal combustion engine having a high pressure pump for delivering fuel to a fuel injector. The pressure output of the pump is sensed and is controlled to provide appropriate fuel pressure to the fuel injector for the given running condition. In addition, a release passage is formed that intersects the high pressure pump at a point intermediate the ends of its stroke and which is controlled by a control valve for releasing pressure to further provide pressure control. Even if fully opened due to failure, the release valve will not preclude the generation of pressure sufficient to run the engine.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: May 28, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Takeo Yoshida, Yoshikazu Nakamura, Minoru Suzuki, Ryoichi Hirai
  • Seat for bicycle
    Patent number: 6382651
    Abstract: A foldable or pivotal seat assembly for a power assisted vehicle, such as a bicycle, wherein the latching mechanism for retaining the seat in its retained position is carried by the seat so as to be moved free of the battery case during servicing.
    Type: Grant
    Filed: March 1, 1996
    Date of Patent: May 7, 2002
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Ryuichi Enda