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1. (WO2018198798) ROTOR FOR GEAR PUMP, AND GEAR PUMP

Pub. No.:    WO/2018/198798    International Application No.:    PCT/JP2018/015386
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Fri Apr 13 01:59:59 CEST 2018
IPC: F04C 2/10
Applicants: NIDEC TOSOK CORPORATION
日本電産トーソク株式会社
Inventors: KOBAYASHI Yoshiyuki
小林 喜幸
HIGUCHI Koji
樋口 孔二
HASHIMOTO Yutaka
橋本 裕
IKEDA Tomokazu
池田 智一
Title: ROTOR FOR GEAR PUMP, AND GEAR PUMP
Abstract:
This rotor for a gear pump comprises an inner rotor and an outer rotor. One member of the inner rotor and the outer rotor comprises a group of tooth bottom sections each having an edge along a first setting curve, and a group of tooth tip sections each having an edge along a second setting curve that is different from the first setting curve, said setting curves being envelopes that are obtained by moving a forming circle along a trochoid curve based on one base circle, said forming circle being smaller than the base circle. When the volume of a cell is maximized, said cell being a space that is formed between two neighboring teeth of the inner rotor and two neighboring teeth of the outer rotor, the maximum length of said cell in a radial direction of the inner rotor is greater than either of the width of a gap between neighboring teeth in the inner rotor and the width of a gap between neighboring teeth in the outer rotor.