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Fluid pump having bearing holdRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Motor And Rotary Nonexpansible Chamber PumpFluid pump having bearing hold description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070065315, Fluid pump having bearing hold. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is based on and incorporates herein by reference Japanese Patent Applications No. 2005-257416 filed on Sep. 6, 2005, No. 2005-302698 filed on Oct. 18, 2005, No. 2005-315974 filed on Oct. 31, 2005, No. 2005-347593 filed on Dec. 1, 2005, No. 2005-363423 filed on Dec. 16, 2005, No. 2006-154435 filed on Jun. 2, 2006, and No. 2006-171173 filed on Jun. 21, 2006. FIELD OF THE INVENTION [0002] The present invention relates to a fluid pump having a bearing hole. BACKGROUND OF THE INVENTION [0003] According to U.S. 2005/0074343 A1 (JP-A-2005-110478), the fuel pump includes the pump portion that is driven by rotative force of the motor portion for pumping fuel. In this structure, a cover surrounds the axial end of the motor portion on the opposite side of the pump portion. The motor portion includes a brushless motor. The cover has the outlet port through which fuel is discharged. The cover has the bearing that rotatably supports the rotation axis of the rotator of the motor portion. [0004] The cover has the bearing hole accommodating the bearing. The bearing hole is blocked at the bottom thereof. In this structure, fuel accumulating in the bearing hole may be deteriorated, and the rotation axis may be corroded due to the deteriorated fuel. Furthermore, foreign matters such as debris caused by ablation in the fuel pump may accumulate in the bearing hole. Consequently, the foreign matters may be stuck in the sliding portion between the rotation axis and the bearing, for example. SUMMARY OF THE INVENTION [0005] In view of the foregoing and other problems, it is an object of the present invention to produce a fluid pump having a bearing hole, in which fuel and foreign matters can be restricted from accumulating. [0006] According to one aspect of the present invention, a fluid pump includes a stationary part that has an inner circumferential periphery. The fluid pump further includes a rotator that is rotatable around the inner circumferential periphery. The rotator has a rotation axis. One of the stationary part and the rotator includes at least one coil. The at least one coil generates magnetic force between the stationary part and the rotator for rotating the rotator when being supplied with electricity. The fluid pump further includes a pump portion that is provided to one axial end of the rotation axis of the rotator. The rotator is adapted to rotating the pump portion for pumping fluid. The fluid pump further includes a cover that covers an other axial end of the rotation axis of the rotator. The cover covers the stationary part on a side of the other axial end of the rotation axis. The cover defines an outlet passage through which fluid is discharged from the pump portion. The cover has a bearing hole that rotatably supports the other axial end of the rotation axis. The bearing hole has a closed bottom. The cover has a communication passage that communicates the outlet passage with the bearing hole. [0007] Alternatively, the bearing hole substantially may axially extend to a closed axial end in the cover. The closed axial end may block the bearing hole with respect to an axial direction of the bearing hole. 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 made with reference to the accompanying drawings. In the drawings: [0009] FIG. 1 is a longitudinal partially sectional view showing a fuel pump according to a first embodiment; [0010] FIG. 2 is a sectional view taken along the line II-II in FIG. 1; [0011] FIG. 3 is a sectional view taken along the line III-III in FIG. 1; [0012] FIG. 4 is a schematic sectional view showing an end cover of a fuel pump according to a second embodiment; [0013] FIG. 5 is a schematic sectional view showing an end cover of a fuel pump according to a third embodiment; and [0014] FIG. 6 is a sectional view showing a fuel pump according to a fourth embodiment. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS First Embodiment [0015] As shown in FIG. 1, a fuel pump 10 of this embodiment is an in-tank turbine pump, for example. The fuel pump 10 is provided in a fuel tank of a motorcycle with an engine size of 150 cc, for example. [0016] The fuel pump 10 includes a pump portion 12 and a motor portion 13. The motor portion 13 rotates the pump portion 12. The housing 14 serves as a housing. The housing 14 accommodates both the pump portion 12 and the motor portion 13. A pump case 20 and an end cover 50 are fixed by crimping axially both ends of the housing 14. The end cover 50 serves as a cover. The thickness of a portion of the housing 14 covering the outer circumferential periphery of a stator core 30 in the motor portion 13 is less than the thickness of a portion defining a step 15 in the pump portion 12. The stator core 30 may serve as a stationary part. The housing 14 is not necessary for defining a magnetic circuit. In this structure, the thickness of the housing 14 surrounding the outer circumferential periphery of the stator core 30 can be reduced, so that the outer diameter of the motor portion 13 can be reduced. [0017] The pump portion 12 serves as a turbine pump. The pump portion 12 includes pump cases 20, 22, and an impeller 24. The pump case 22 is abutted axially onto the step 15 of the housing 14, so that the pump case 22 is axially aligned. A bearing 26 is press-inserted into the center of the pump case 22. The pump case 20 is fixed by crimping one end of the housing 14. Axial force is caused by the crimping, thereby producing pressure for axially pressing the pump case 22 and the pump case 20 respectively onto the step 15 and the pump case 22, so that fuel is sealed. Continue reading about Fluid pump having bearing hold... Full patent description for Fluid pump having bearing hold Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Fluid pump having bearing hold 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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