Hitachi, Ltd.

Bridgestone Corporation

Hitachi, Ltd., Trustee, for the Benefit of Hitachi Air Conditioning Systems Co., Ltd.

Hiroki Ohsumimoto

Hirotaka Kameya

Shigekazu Nozawa

Masayuki Urashin

Takeshi Hida

Atsushi Watanabe

There is provided a method of producing a tire comprising the steps of: applying a chafer rubberby spirally winding a rubber ribbon onto a base; applying a sidewall rubberof a first color by spirally winding a rubber ribbon at a position on the basespaced from the position where the chafer rubber is stuck; applying a sidewall rubberof the second color by spirally winding a rubber ribbon between the chafer rubber sticking position and the first color sidewall rubber sticking position; and applying a cover rubberof the first color over the entire surface of the sidewall rubber of the second color, wherein on the occasion when said chafer rubbersor sidewall rubbersof the second color are stuck, they are applied so that they are adjacent to each other, thereby sticking a rubber member of a colored tire onto the sidewall of the tire without involving defects such as trapped air and a bare as well as severe decrease of the productivity.

Method of producing tire

An oil separator and an oil reservoir are formed integral with a main casing. Also, an opening communicated with the oil reservoir is formed in a part of a lower portion of an oil separation space of the oil separator. Preferably, the opening is formed so that its width is increased as it approaches an outer peripheral side of the oil separation space from a center thereof. Further, a safety valve is installed so that a line connecting between the safety valve and the center of the oil separator is made substantially in parallel to axes of screw rotors.

Screw compressor

A screw compressor of which a female rotor is driven by a motor, and of which a male rotor is driven by the female rotor. The male or female rotor is composed of a member which is made of cast iron and is subjected to surface hardening treatment or heat treatment including quenching. The surface hardening treatment may include sulphonitriding or nitiriding treatment. In the case of subjecting the cast iron to the heat treatment, austemper treatment is applied.

Screw compressor and method of manufacturing rotor for the same

Growing community of inventors

Kodaira, Japan

Hiroki Ohsumimoto