Fuel pump

Abstract

A fuel pump may have an armature 16 and a pump section 10. The armature 16 may include a shaft 17, a core 21 fixed to the shaft 17, and coils 29 that is wound around the core 21 . The pump section 10 is rotatably driven by the shaft 17. Preferably, the armature 16 includes a guide 34 that guides the coils 29 on the outside of the outer surface of the shaft 17 on at least at one axial end of the core 21. The coils 29 are wound around opposing slots. On the end where the guide 34 is provided, the coils 29 are preferably guided by the guide 34, and thereby are wound to detour around the region in proximity to the shaft 17.

1 . A fuel pump comprising: 
 an armature having a shaft, a core fixed to the shaft, and a coils wound around the core; and    a pump section to be rotated by the shaft,    wherein the coils are wound around opposing slots, and the coils are wound to detour around the region in proximity to the shaft on at least at one axial end of the core.    
   
   
       2 . A fuel pump as in  claim 1 , wherein the armature further comprises a guide for guiding the coils on the outside of the outer surface of the shaft on at least at one axial end of the core, and wherein the coils are wound to detour around the region in proximity to the shaft by being guided by the guide.  
   
   
       3 . A fuel pump as in  claim 2 , wherein the guide is made of resin material.  
   
   
       4 . A fuel pump as in  claim 3 , wherein an insulating coating is formed on the core and the insulating coating and the guide are integrally formed.  
   
   
       5 . A fuel pump as in  claim 1 , wherein guides are provided on both ends of the core.  
   
   
       6 . A fuel pump comprising: 
 an armature having a shaft, a core fixed to the shaft, and a coil wound around the core; and    a pump section to be rotated by the shaft,    wherein the coils are wound around opposing slots, and wherein the armature further comprises a guide to restrict further protrusion of the coils toward the end of the shaft on at least at one axial end of the core.    
   
   
       7 . A fuel pump comprising: 
 an armature having a shaft, a core fixed to the shaft, and a coil wound around the core; and    a pump section to be rotated by the shaft, wherein    the armature further comprises a guide on at least at one axial end of the core, the guide having a first surface, which guides the coils on the outside of the outer surface of the shaft, and a second surface which restricts further protrusion of the coils toward the end of the shaft,    the coils are wound around opposing slots, and    the coils are wound so as to detour around the region in proximity to the shaft by being guided by the guide.