Rotor and electric vehicle

Abstract

A rotor includes a rotor core fixedly attached to a rotational shaft and having a plurality of hole portions arranged in the circumferential direction, a magnet inserted into a plurality of hole portions each, and a filling portion injected into the hole portion. The filling portion is injected into the hole portion from a gate facing a central part in the width direction of the magnet in the opening of the hole portion.

1 . A rotor comprising:
 a rotor core fixedly attached to a rotational shaft and having a plurality of hole portions arranged in a circumferential direction;   a magnet inserted into said plurality of hole portions each; and   a filling portion injected into said hole portion,   said filling portion being injected into said hole portion from a portion facing a central part in a width direction of said magnet in an opening of said hole portion.   
   
   
       2 . The rotor according to  claim 1 , wherein
 said hole portion includes an extension in a portion facing a corner of said magnet, for helping spread of said filling portion.   
   
   
       3 . The rotor according to  claim 1 , wherein
 said filling portion is injected into said hole portion from a portion facing a central part of a side of said magnet, said side being located inward in a radial direction of said rotor core.   
   
   
       4 . The rotor according to  claim 3 , wherein
 said hole portion includes an outer extension facing a corner of said magnet that is located outward in the radial direction, for helping spread of said filling portion.   
   
   
       5 . The rotor according to  claim 1 , wherein outer extensions and inner extensions for helping spread of said filling portion are provided in respective portions facing four corners in an axial cross section of said magnet in said hole portion. 
   
   
       6 . The rotor according to  claim 1 , further comprising an end plate provided on an axial end surface of said rotor core, wherein
 said rotor core is formed of a laminated steel,   on said axial end surface, a first projection located at a caulked portion of said laminated steel and a second projection located at a portion where said filling portion is injected are formed, and   said first projection and said second projection are substantially concentrically provided such that a common groove for avoiding said first projection and said second projection can be formed in said end plate.   
   
   
       7 . An electric vehicle comprising the rotor as recited in  claim 1 .