公开(公告)号：JP2000265972A

公开(公告)日：2000-09-26

申请号：JP6940099

申请日：1999-03-16

Applicant: DENSO CORP

Inventor： MATSUMOTO TATSUYA ,  MURAMATSU TOSHIHIKO

IPC: F02M37/08 ,  F04C2/10 ,  F04C14/00 ,  F04C15/06 ,  F04C15/04

Abstract: PROBLEM TO BE SOLVED: To reduce noise and vibration in a trochoid gear-type fuel pump. SOLUTION: In a trochoid gear-type fuel pump, an outer gear 25 and an inner gear 26 are eccentrically arranged, fuel is sucked from a suction port by continuously increasing and decreasing the capacities of pump chambers 30 while moving a plurality of pump chambers 30 formed by meshing both gears 25, 26 in the rotational direction by the rotation of both gears 25, 26, and fuel is discharged from a discharge port. A damper means 37 for reducing discharge pulsation by restraining pressure rise of the pump chambers 30, passing the range is provided at least one or both of the range extending from the suction port to the discharge port and the range extending from the discharge port to the suction port. The damper means 37 is constituted by forming a through hole 38 on a suction side cover 14 and fixing an elastic plate 39 so that a capacity variable chamber communicated with the through hole 38 may be formed outside the side cover 14.

公开(公告)号：JPH10205476A

公开(公告)日：1998-08-04

申请号：JP1275097

申请日：1997-01-27

Applicant: DENSO CORP

Inventor： MATSUMOTO TATSUYA ,  ITO MOTOYA ,  KOBAYASHI ATSUSHIGE ,  KUROIWA KAZUNARI

IPC: F02M37/04 ,  F02M37/08 ,  F02M37/20 ,  F04D5/00 ,  F04D15/00 ,  F04D23/00

Abstract: PROBLEM TO BE SOLVED: To prevent reduction of a discharge flow rate at a high air temperature period, in a fuel pump for an internal combustion engine consisting of a regeneration pump. SOLUTION: A given range from the starting end of a pump flow passage forms a fuel introduction part 43 and a following part forms a boosting flow passage part 44. The upper inside part of the fuel introduction part 43 consists of a vapor reservoir part 45 the middle part of which has a specified depth D1 deeper than the depth D2 of a boosting flow passage part 44; and a guide part 46 having depth gradually decreased from the vapor reservoir part 45 toward the boosting flow passage part 44. Vapor contained in liquid fuel sucked in the fuel introduction part 43 gathers in a vapor reservoir part 45. Thereafter, the liquid fuel flows a bit by a bit from the vapor reservoir part 45 to a guide part 46 along with rotation of an impeller 25 and when the liquid fuel flows in the boosting flow passage part 44, it is bled through a vapor bleed hole 47.