Coil forming device

Patent metadata

Field	Value
Publication number	US-11283333-B2
Application number	US-201816160105-A
Country	US
Kind code	B2
Filing date	Oct 15, 2018
Priority date	Dec 1, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

In a coil forming device, an edge line in an escape region is formed so that a clearance between the edge line in the escape region and a recess portion in an axis direction is larger than a minimum clearance between the edge line in an inclined region and the recess portion in the axis direction. When a second die is rotated relative to a first die in the clockwise direction the flat-square conductive material end is bent in flatwise bending by the recess portion and the inclined region of a protrusion portion, and then, the flat-square conductive material end reaches the escape region.

First claim

What is claimed is:

1. A coil forming device configured to perform flatwise bending on a flat-square conductive material end as an end of a flat-square conductive material constituting a coil, the coil forming device comprising:
a first die configured to independently rotate around a first rotation axis, the first die including a first machining surface; and
a second die configured to independently rotate around the first rotation axis, the second die including a second machining surface,
the first machining surface and the second machining surface being configured to be placed so as to face each other across the flat-square conductive material end in an axis direction of the first rotation axis;
the first machining surface including a recess portion recessed so as to be distanced from the second machining surface when the first machining surface and the second machining surface face each other,
the second machining surface including a protrusion portion protruding toward the recess portion when the first machining surface and the second machining surface face each other,
an edge line of the protrusion portion extends in an arc shape around the axis direction of the first rotation axis,
the protrusion portion including an inclined region and an escape region adjacent to each other in a rotation direction of the second die,
the inclined region and the escape region being placed such that, when the second die is rotated relative to the first die in a first rotation direction, the inclined region first faces the recess portion in the axis direction of the first rotation axis, and then, the escape region faces the recess portion in the axis direction of the first rotation axis,
the edge line in the inclined region being inclined so that a clearance between the edge line in the inclined region and the recess portion in the axis direction of the first rotation axis is gradually decreased as the second die is rotated relative to the first die in the first rotation direction,
the edge line in the escape region being formed so that a clearance between the edge line in the escape region and the recess portion in the axis direction of the first rotation axis is larger than a minimum clearance between the edge line in the inclined region and the recess portion in the axis direction of the first rotation axis; and
when the second die is rotated relative to the first die in the first rotation direction in a state where the flat-square conductive material end is placed between the first machining surface and the second machining surface so that two flat surfaces of the flat-square conductive material end face the first machining surface and the second machining surface respectively, the flat-square conductive material end being bent in flatwise bending by the recess portion and the inclined region of the protrusion portion, and then, the flat-square conductive material end being placed in the escape region.

2. The coil forming device according to claim 1 , wherein a width of the escape region is larger than a width of the flat-square conductive material end.

3. The coil forming device according to claim 1 , wherein the first die includes a first restriction surface,
the first restriction surface is configured to restrict the flat-square conductive material end from moving relative to the first die in the first rotation direction by coming into contact with a first edge surface of the flat-square conductive material end, when the flat-square conductive material end is placed between the first machining surface and the second machining surface so that the two flat surfaces of the flat-square conductive material end face the first machining surface and the second machining surface, respectively.

4. The coil forming device according to claim 3 , wherein the second die includes a second restriction surface,
the second restriction surface is configured to come into contact with a second edge surface of the flat-square conductive material end when the flat-square conductive material end moves over the inclined region and reaches the escape region, the second edge surface being on an opposite side from the first edge surface of the flat-square conductive material end.

5. The coil forming device according to claim 1 , wherein a difference between the clearance between the edge line in the escape region and the recess portion in the axis direction and the minimum clearance between the edge line in the inclined region and the recess portion in the axis direction is from 0.05 mm to 0.1 mm.

Assignees

• Toyota Motor Co Ltd
• Toyota Jtdosha Kabushiki Katsha

Inventors

• Kuraoka Hiromitsu
• Takahashi Toshiaki

Classifications

• H02K15/33

  Connecting winding sections; Forming leads; Connecting leads to terminals · CPC title

• H02K15/0431 Primary

  Concentrated windings · CPC title

• H02K15/0428

  Processes or apparatus for simultaneously twisting two or more hairpins · CPC title

• H02K15/0414

  the windings consisting of separate elements, e.g. bars, segments or half coils · CPC title

• Y10T29/49071

  by winding or coiling · CPC title