US-12620879-B2 - Coil insertion device

US12620879B2US 12620879 B2US12620879 B2US 12620879B2US-12620879-B2

Abstract

A coil insertion device includes coil diameter expanders, the coil diameter expanders being configured to insert a coil assembly in a wound state into slots of a stator core by expanding the coil assembly in diameter from inside of the stator core, each of the coil diameter expanders includes: a coil presser that is arranged inside the coil assembly and presses coil end portions of the coil assembly outward from inside to expand the coil end portions in diameter; and a restrictor that is arranged outside the coil assembly, restricts outward movement of the coil end portions expanded in diameter by the coil presser, and sandwiches the coil end portions of the coil assembly inserted in the slots with the coil presser.

Inventors

Norihiko HIKIMA
Yasuto Ohashi

Assignees

HONDA MOTOR CO., LTD.

Dates

Publication Date: 20260505
Application Date: 20221028
Priority Date: 20211117

Claims (3)

1 . A coil insertion device comprising coil diameter expanders, the coil diameter expanders being configured to insert a coil assembly in a wound state into slots of a stator core by expanding the coil assembly in diameter from inside of the stator core, each of the coil diameter expanders comprising: a coil presser that is arranged inside the coil assembly and presses coil end portions of the coil assembly outward from inside to expand the coil end portions in diameter; and a restrictor that is arranged outside the coil assembly, restricts outward movement of the coil end portions expanded in diameter by the coil presser, and sandwiches the coil end portions of the coil assembly inserted in the slots with the coil presser, wherein the coil presser includes a plurality of piece members arranged in an annular shape, a movable cylinder portion and a movable arm portion, the movable arm portion is translated by the movable cylinder portion to expand in diameter the annular shape in which the plurality of piece members are arranged, and each of the plurality of piece members has a substantially fan shape, and has a pair of fitting protrusions at one end portion in a circumferential direction.
2 . The coil insertion device according to claim 1 , wherein the restrictor has an inner peripheral surface that is perpendicular to an end face of the stator core.
3 . The coil insertion device according to claim 1 , wherein the restrictor has an inner peripheral surface as an inclined surface that is inclined outward in a radial direction with an increase in distance from an end face of the stator core.

Description

This application is based on and claims the benefit of priority from Japanese Patent Application No. 2021-137290, filed on 17 Nov. 2021, the content of which is incorporated herein by reference. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a coil insertion device and a coil insertion method. Related Art There has been conventionally known a method of mounting a coil into slots of a stator core by inserting the coil wound in an annular shape inside the stator core and pressing the coil outward from the inside against the slots of the stator core by a roller arranged eccentrically inside the coil to expand the coil in diameter (for example, see Japanese Patent No. 6390772). Patent Document 1: Japanese Patent No. 6390772 SUMMARY OF THE INVENTION FIG. 16 shows a state in which one coil 300 of a coil assembly mounted in stator core 400 expands in diameter by being pressed outward from inside, and inserted into slots 401 from inside of the stator core 400. By coil end portions 301 being pressed, the coil 300 moves outward from inside of the stator core 400 while expanding in diameter. Along therewith, pitch P between straight portions 302 of the coil 300 inserted into slots 401 is widened, and the coil end portions 301 also spread in the circumferential direction of the stator core 400. However, when insertion of the coil 300 into the slots 401 is completed, and the pressure is released, a phenomenon occurs that the coil end portions 301 expanded in diameter decrease in diameter, trying to return to the state before the diameter expansion, due to springback of the coil 300 as shown in FIG. 17. When the coil end portions 301 are reduced in diameter to the state before the diameter expansion, the pitch P between straight portions 302 changes in a direction of being reduced, and there is a possibility that the coil 300 inserted in the slots 401 moves inward in the radial direction and returns to the inside of the stator core 400. To address this, it is necessary to, for example, repeatedly press the coil 300, which causes a disadvantage that the workability of coil insertion work is poor. An object of the present invention is to provide a coil insertion device and a coil insertion method capable of preventing a coil from returning inward due to springback of coil end portions after insertion into slots and improving the workability of coil insertion work. A first aspect of the present invention is directed to a coil insertion device (for example, a coil insertion device 1 described later) including coil diameter expanders (for example, the coil diameter expansion devices 5 described later), the coil diameter expanders being configured to insert a coil assembly (for example, a strip-shaped coil 100 described later) in a wound state into slots (for example, slots 22 described later) of a stator core (for example, a stator core 2 described later) by expanding the coil assembly in diameter from inside of the stator core. Each of the coil diameter expanders includes: a coil presser (for example, a coil presser 53 described later) that is arranged inside the coil assembly and presses coil end portions (for example, coil end portions 103 described later) of the coil assembly outward from inside to expand the coil end portions in diameter; and a restrictor (for example, a restrictor 55 described later) that is arranged outside the coil assembly, restricts outward movement of the coil end portions expanded in diameter by the coil presser, and sandwiches the coil end portions of the coil assembly inserted in the slots with the coil presser. A second aspect is an embodiment of the first aspect. In the coil insertion device according to the second aspect, the restrictor has an inner peripheral surface (for example, an inner peripheral surface 55a described later) that may be perpendicular to an end face (for example, an end face 2a described later) of the stator core. A third aspect is an embodiment, of the first aspect. In the coil insertion device according to the third aspect, the restrictor has an inner peripheral surface (for example, an inner peripheral surface 55a) as an inclined surface that may be inclined outward in a radial direction with an increase in distance from an end face (for example, an end face 2a described later) of the stator core. A fourth aspect of the present invention is directed to a coil insertion method for inserting a coil assembly (for example, the strip-shaped coil 100 described later) in a wound state into slots (for example, the slots 22 described later) of a stator core (for example, the stator core 2 described later) by expanding the coil assembly in diameter from inside of the stator core. The method includes: pressing coil end portions (for example, the coil end portions 103 described later) of the coil assembly outward from inside to expand the coil end portions in diameter by a coil presser (for example, the coil presser 53 described later) arranged