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  Fuel pumpUSPTO Application #: 20080085199Title: Fuel pump Abstract: A fuel pump includes a plurality of magnets that are disposed circumferentially on an inner surface of a housing of the fuel pump and alternately form different magnetic poles, an armature rotatably disposed inside the permanent magnets, a rotating member disposed on a rotary shaft that is connected with the armature and rotates with the rotary shaft by rotating the armature, a pump casing that accommodates and rotatably supports the rotating member, and a discharge port disposed on the pump casing so as to discharge fuel pressurized by the rotation of the rotating member. According to the present invention, an imaginary line extending straight through the discharge port in a flow direction of fuel discharging from the discharge port extends into a circumferential gap between two of said permanent magnets. (end of abstract) Agent: Nixon & Vanderhye, Pc - Arlington, VA, US Inventors: Tadashi Hazama, Kiyonori Moroto USPTO Applicaton #: 20080085199 - Class: 4174233 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20080085199. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001]This application is based upon, claims priority from and incorporates herein by reference the contents of Japanese Patent Applications No. 2006-272933 filed on Oct. 4, 2006. FIELD OF THE INVENTION [0002]The present invention relates to a fuel pump that supplies fuel suctioned from a fuel tank to an internal combustion engine. BACKGROUND OF THE INVENTION [0003]Fuel pumps that include a motor section and a pump section that is driven by the motor section, pumps up and pressurizes fuel for supplying the fuel from a fuel tank to an internal combustion engine through the inside of the motor section are well-known, as disclosed in JP-A-5-187382, JP-A-6-167291 and JP-A-6-229390. The motor section includes a plurality of permanent magnets that are positioned about a circumference of its housing so as to form a plurality of magnetic poles in a circumferential direction, an armature disposed inside the permanent magnets, etc. [0004]As shown in FIG. 4, fuel pressurized in the pump section is discharged toward the permanent magnets 310 from a discharge port 302 formed in a pump casing 300 of the pump section, which accommodates a rotating member. Fuel discharged from the discharge port 302 flows through the inside of the motor section. Specifically, the discharged fuel flows through a gap between an outer surface of the armature and an inner surface of the permanent magnets (not shown), and a gap 312 between the adjacent permanent magnets 310 arranged in the circumferential direction of the inside of the motor section. [0005]However, in the fuel pump, fuel discharged from the discharge port 302 of the pump casing 300 cannot flow smoothly into a gap 312 between the adjacent permanent magnets 310 because the fuel collides with an edge surface 314 of the permanent magnets 310, as shown in FIG. 4. This increases the pressure loss of the fuel flow. SUMMARY OF THE INVENTION [0006]In view of the foregoing problems, it is an object of the present invention to provide a fuel pump, in which the fuel pressurized in the pump section can flow smoothly into the gap between the adjacent permanent magnets of the motor section. [0007]According to the present invention, a fuel pump includes a plurality of magnets that are disposed circumferentially on an inner surface of a housing of the fuel pump and alternately form different magnetic poles, an armature rotatably disposed inside the permanent magnets, a rotating member disposed on a rotary shaft that is connected with the armature and rotates with the rotary shaft by rotating the armature, a pump casing that accommodates and rotatably supports the rotating member, and a discharge port disposed on the pump casing so as to discharge fuel pressurized by the rotation of the rotating member. According to the present invention, an imaginary line extending straight through the discharge port in a flow direction of fuel discharging from the discharge port extends into a circumferential gap between two of said permanent magnets. In a first embodiment, an imaginary line extending in a flow direction of fuel discharging from the discharge port along an inner inclined surface of the discharge port extends between upstream ends of adjacent permanent magnets. In a second embodiment, an edge between the inner inclined surface of the discharge port and an outer surface of the pump casing is below a gap formed between two permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS [0008]The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings. In the drawings: [0009]FIG. 1 is a longitudinal cross-sectional view showing a fuel pump according to the first embodiment of the present invention; [0010]FIG. 2A is a plan view showing a pump casing of the fuel pump shown in FIG. 1; [0011]FIG. 2B is an enlarged cross-sectional view of a portion around an discharge port of the pump casing of the fuel pump shown in FIG. 1; [0012]FIG. 3A is a plan view showing a pump casing of the fuel pump according to the second embodiment of the present invention; [0013]FIG. 3B is an enlarged cross-sectional view of a portion around an discharge port of the pump casing of the fuel pump according to the second embodiment of the present invention; [0014]FIG. 4A is a plan view showing a pump casing of a conventional fuel pump; and [0015]FIG. 4B is an enlarged cross-sectional view of a portion around an discharge port of the pump casing of the conventional fuel pump. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment [0016]A fuel pump 10 according to the first embodiment will be described with reference to FIGS. 1 and 2. [0017]The fuel pump 10 is an in-tank type turbine pump that is usually accommodated in a fuel tank (not shown) of a vehicle, such as two-wheel vehicle or four-wheel vehicle. The fuel pump 10 pressurizes fuel suctioned from the fuel tank, and supplies the pressurized fuel to an internal combustion engine. Continue reading... Full patent description for Fuel pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fuel pump patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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