公开(公告)号：US20190078566A1

公开(公告)日：2019-03-14

申请号：US16123040

申请日：2018-09-06

Applicant: DENSO CORPORATION

Inventor： Masashi INOUE ,  Yasuhiro TAKEUCHI ,  Yuuji HIDAKA ,  Masatoshi TAKAGI

IPC: F04C2/16 ,  F04C13/00

Abstract: A screw pump has a male screw accommodation hole and a female screw accommodation hole formed in a pump housing. A male screw member and a female screw member are respectively accommodated in the male screw accommodation hole and the female screw accommodation hole. A male-side clearance is formed in a radial direction between the male screw member and the male screw accommodation hole and a female-side clearance is formed in the radial direction between the female screw member and the female screw accommodation hole. The female-side clearance is made to be larger than the male-side clearance, so that the female screw member can easily move in a direction away from the male screw member to the female-side clearance when any extraneous material is going to be wedged between the male screw member and the female screw member, to thereby prevent a locked condition of the screw members.