COOLING STRUCTURE FOR ELECTRIC MOTOR, AND MANUFACTURING METHOD THEREOF

• Main Authors: KASHIMOTO MASAAKI, ISHIZAKA TOMOTAKA, NISHIMURA HIROBUMI
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2016
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To provide a cooling structure for an electric motor having both a high cooling property and high mass-productivity.SOLUTION: The cooling structure includes: a motor body including a rotor and a stator; a casing which includes a cylindrical peripheral wall surrounding the motor body and an end wall extending radially insides from one end of the peripheral wall and is formed by integrally molding the peripheral wall and the end wall with the same material; and a cover member that is attached on an outer surface of the end wall of the casing. The casing includes: a peripheral wall cooling flow passage which is formed within the thickness of the peripheral wall and in which a coolant flows; and an end wall cooling flow passage which is formed in the end wall and communicated to the peripheral wall cooling flow passage. A recess that is formed on the outer surface of the end wall is covered by the cover member, such that the end wall cooling flow passage is formed from an inner wall surface of the recess and a wall surface of the cover member.SELECTED DRAWING: Figure 2 【課題】高い冷却性と高い量産性を兼ね備えた電動モータの冷却構造を提供する。【解決手段】ロータおよびステータを有するモータ本体と、前記モータ本体を包囲する筒状の周壁部および当該周壁部の一端から径方向内側に延びる端壁部を含むとともに前記周壁部と前記端壁部が同一材料により一体成形されてなるケーシングと、前記ケーシングの前記端壁部の外面に取り付けられるカバー部材とを備え、前記ケーシングは、前記周壁部の厚み内に形成されるとともに冷却媒体が流れる周壁冷却流路と、前記端壁部に形成されて前記周壁冷却流路に連通する端壁冷却流路とを含み、前記端壁冷却流路は、前記端壁部の外面に形成された凹部が前記カバー部材に覆われることにより、前記凹部の内壁面と前記カバー部材の壁面とにより形成されていることを特徴とする。【選択図】図２