| 摘要 |
PROBLEM TO BE SOLVED: To provide a gear pump which realizes a low noise operation by reducing a backlash. SOLUTION: Bearings 20 and 21 are arranged in shaft holes 4a and 4b to rotatably support rotary shafts 13 and 14. The bearing 20 is formed by an outer bearing race 23 and a plurality of needles 22 arranged in a circumferential direction of the outer bearing race 23 at even intervals, and the bearing 21 is also formed by bearing outer race 25 and a plurality of needles 24. An internal clearance CL1 is provided between the rotary shaft 13 and plurality of needles 22, and the rotary shaft 14 and plurality of needles 24, and the internal clearance CL1 is set up to secure reliability of the bearing 20 and 21. An external clearance CL2 is provided between the outer bearing race 25 and a side plate 4, and the internal clearance CL1 and external clearance CL2 are provided to make a backlash BR formed between a drive gear 11 and driven gear 12 become approximately a zero. COPYRIGHT: (C)2008,JPO&INPIT
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