Aisan Kogyo Kabushiki Kaisha

Aisan Kogyo Kabushiki

Mamoru Tateishi

Katsumi Murai

Masaki Ikeya

Koichi Suzuki

Hitoshi Takeuchi

Tsutomu Ikeda

Kenji Hayashi

Tetsuji Inoue

Kenji Eitoku

Hideki Asano

Masashi Ozeki

Mikiharu Yoshizaka

Takashi Tsuge

Shoichi Hagiwara

Toshiyuki Masui

Lei Zhang

Hiroya Abe

Tuneaki Aoki

Yasuo Hosokawa

A fuel pump unit includes a fuel pump which is driven by a motor, a secondary filter case placed to surround the fuel pump and contains a filter, a reserve cup which houses the fuel pump and the secondary filter case, and a pump controller which drivingly controls the fuel pump. A shielding material is provided in the reserve cup to shield electrical noise generated by the fuel pump. The shielding material is grounded. The pump controller includes a pump drive circuit which is provided with an electric filter.

Fuel supply apparatus

A throttle body () includes a resin main body () defining a bore () through which intake air flows, a valve body () having a shaft part () rotatably supported by the resin body () and a valve part () for opening and closing the bore () of the main body (), and a resin cover body () attached to the main body (). The cover body () is attached to the main body () by welding.

Throttle body, method of adjusting opening of opener, and method of manufacturing throttle body

Disclosed is the powder feeder in which the duty ratio X.sub.T corresponding to the target feed amount Q.sub.T is calculated on the basis of the calibration curve obtained by the feeder calibration which is conducted before the start of powder feed, and the powder P starts to be fed according to the duty ratio X.sub.T, therefore, the actual feed amount can reach to the target feed amount Q.sub.T in a short time (within the time T.sub.1) from the start of powder feed, and the powder P can be fed while controlling the actual feed amount with high accuracy, and further the powder P can be precisely fed even in case of the short time feed for several seconds.

Control apparatus for powder feeder

Disclosed is the drive apparatus for the powder feeder, which has; the duty ratio control circuit 12 which applies the alternating voltage with the resonance frequency to the vibrator 10 during a time corresponding to the duty ratio; the current monitor 15 which detects the residual frequency of the electro motive force produced due to the residual oscillation of the vibrator 10 when the alternating voltage with the resonance frequency is not applied from the duty ratio control circuit 12 and feeds back the detected residual frequency to the PLL control circuit 11 through the zero-cross comparator 17.

Drive apparatus for driving an oscillator and a powder feeder having the

This invention provides a method for driving intermittently a vibrator having a resonance frequency with the resonance frequency in which the vibration of the resonance frequency is attenuated promptly after the ending of driving with the resonance frequency and the vibration of the resonance frequency increases promptly after the starting of driving with the resonance frequency. Further, this invention provides a method for driving powder feeders using ultrasonic motors which are easy to control powder feed rates and further provides powder feeders. A powder feed pipe is attached to an ultrasonic motor the end of which is elliptically vibrated with the resonance frequency, and powder P is fed from the hopper body when AC voltages of the resonance frequency and non-resonance frequency are applied alternately to the piezoelectric element 1 of the ultrasonic motor.

Powder feeder and method for driving powder feeder

Disclosed is the powder feeder in which the sampling timing G, H, . . . is set during the inactive period T.sub.i in synchronism with the cycle of the duty ratio clock when the output voltage V.sub.CELL is fed back to the microcomputer 13, thereby the feedback signal (the output voltage V.sub.CELL) on which noise is not superposed can be sampled and the feed amount of the powder P can be controlled with high accuracy.

Control apparatus for intermittently driving actuator, powder feeder and

The present invention provides a throttle valve opening degree sensor for detecting the opening degree of a throttle valve used for an internal combustion engine wherein a rotor shaft capable of interlocking with a throttle valve has a cylindrical covering portion having an outer circumferential cylindrical body at the outer end, the cylindrical covering portion covering the outer end of the bearing portion exposed to the base portion of the housing and having an elastic engaging portion having cross-like splitted grooves at the top end and a square outer periphery, and the rotor has a square engaging hole capable of fitting the elastic engaging portion, the elastic engaging portion being fitted to and elastically abutted against the engaging hole thereby securing the rotor to the rotor shaft. According to the throttle valve opening degree sensor, it can prevent the deviation of the rotor from the center and enhance the accuracy for the attaching position, and provide water proofness and dust proofness for the outer end of the rotor shaft and the bearing portion.

Throttle valve opening degree sensor

A sliding contact includes a sliding contact piece having a contact segment and fixed to a snap member extending perpendicularly to the contact segment. The snap member has at least two snap portions formed in alignment perpendicular to the contact segments including one adjacent the contact segments which is adapted to be concentrically fitted onto a mounting projection of a slider and another apart from the contact segments which is adapted to keep the angle of the contact segments to the slider. Also, there is a connecting contact with at least two holding arms for nipping therebetween a substrate on both sides thereof, at least one of the holding arms having a projection to be inserted in a hole or recess preliminarily formed in the substrate. After the projection is received in the hole or recess, it is fixed by a conductive anchoring material such as solder, so that the connecting contact may be fixedly attached to the substrate.

Growing community of inventors

Obu, Japan

Mamoru Tateishi