Sumitomo Metal Industries, Inc.

Harmonic Drive Systems Inc.

Yanmar Co., Ltd.

Japan National Oil Corporation

Akio Ikeda

Yasutaka Okada

Takeo Kudo

Taishi Moroishi

Hiroo Ohtani

Kunihiko Yoshikawa

Yoshihide Kiyosawa

Masaaki Igarashi

Shiro Mukai

Shoji Kuwana

Satoshi Hattori

Yuji Shiba

Jun Sakata

Toshiaki Misawa

Koetsu Shano

A trochoid pump, comprising a driving shaft, wherein a drive gear comprising of a bevel gear is fixed on one end thereof and an inner rotor is penetrated onto the other end thereof, an outer rotor, the center of which is decentered to the inner rotor, wherein both rotors are covered with the cap and the casing, a first regulatory structure, wherein the driving shaft or a means of control fixed on the driving shaft regulates an one-way movement to the casing, a second regulatory structure, wherein an end face on the other side of the driving shaft is engaged with one end of the cap and regulates the other way movement of the cap, wherein the thrust of the driving shaft is axially regulated by the first regulatory structure and by the second regulatory structure.

Trochoid pump providing axial regulation of a driving shaft

Device for controlling the drilling direction of drill bit

Positioning device for a member and drilling system employing said

An attitude control device has a plurality of harmonic drive mechanisms of the hollow type, preferably first and second harmonic drive mechanisms. First and second rotational members are connected to the outputs of the first and second harmonic drive mechanisms. These rotational members have eccentric hollow portions which rotate eccentrically around the rotational axes of the harmonic drive mechanisms. A member to be driven is placed to extend through the eccentric hollow portions such that it is supportedly contacted with the inner surfaces of the eccentric hollow portions. In operation, the eccentric hollow portions are rotated relative to each other, whereby the member to be driven is controllably oriented to a desired direction. The attitude control device can be employed as a drillingdirection control device wherein a rotational drill shaft is supported by inner surfaces of eccentric hollow portions of first and second rotational members. These rotational members are rotated by first and second harmonic drive mechanisms. By rotating the eccentric hollow portions, the rotational drilling shaft is changed in orientation from the vertical direction.

Attitude control device and drilling-direction control device

An attitude control device has a plurality of harmonic drive mechanisms of the hollow type, preferably first and second harmonic drive mechanisms. First and second rotational members are connected to the outputs of the first and second harmonic drive mechanisms. These rotational members have eccentric hollow portions which rotate eccentrically around the rotational axes of the harmonic drive mechanisms. A member to be driven is placed to extend through the eccentric hollow portions such that it is supportedly contacted with the inner surfaces of the eccentric hollow portions. In operation, the eccentric hollow portions are rotated relative to each other, whereby the member to be driven is controllably oriented to a desired direction. The attitude control device can be employed as a drilling-direction control device wherein a rotational drill shaft is supported by inner surfaces of eccentric hollow portions of first and second rotational members. These rotational members are rotated by first and second harmonic drive mechanisms. By rotating the eccentric hollow portions, the rotational drilling shaft is changed in orientation from the vertical direction.

Attitude and drilling-direction control device

A precipitation-hardening-type Ni-base alloy exhibiting improved resistance to stress corrosion cracking in a sour gas atmosphere containing elemental sulfur at high temperatures is disclosed. The alloy consists essentially of, by weight %;

Precipitation-hardening-type Ni-base alloy exhibiting improved corrosion

A precipitation-hardening-type Ni-base alloy exhibiting improved resistance to stress corrosion cracking in a sour gas atmosphere containing elemental sulfur at high temperatures is disclosed. The alloy comprises essentially, by weight %;

Precipitation-hardening-type ni-base alloy exhibiting improved corrosion

A process for manufacturing high strength deep well casing, tubing, and drill pipes, which have improved resistance to stress corrosion cracking is disclosed. The process comprises the steps of preparing an alloy composition which is:

Process for making high strength deep well casing and tubing having

An alloy useful for manufacturing high strength deep well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H.sub.2 S--CO.sub.2 --Cl.sup.- environment, which comprises the following alloy composition:

Alloy for making high strength deep well casing and tubing having

An alloy useful for manufacturing high strength deep well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H.sub.2 S--CO.sub.2 --Cl.sup.- -environment, which comprises the following alloy composition:

An alloy useful for manufacturing high strength deep well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H.sub.2 S-CO.sub.2 -Cl.sup.- environment, which comprises the following alloy composition:

An alloy useful for manufacturing high strength oil-well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H.sub.2 S--CO.sub.2 --Cl.sup.- environment, which comprises the following alloy composition:

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Osaka, Japan

Akio Ikeda