Rotor of an electric motor and method of manufacturing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorRyuuji Tou
Life of this patent
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Abstract
In a manufacturing method of a rotor for an electric motor including: a core (4) formed of stacked steel plates, each of which has a center hole (4a); and a shaft (3) inserted through the center hole (4a) of the core (4), the shaft (3) is deformed to fit a second end plate (2) in a state where the second end plate (2) is pressed against the core (4), and a deformed portion (3e) of the shaft (3) that engages with an edge (2a, 2b) of the second end plate (2) is deformed along a core-side edge portion (2a) and a no core-side edge portion (2b) of the edge (2a, 2b) of the second end plate (2) so that the deformed portion (3e) is deformed into the deformed shape that fits the shape of the edge (2a, 2b) of the second end plate (2).
Claims4
A manufacturing method of a rotor for an electric motor including a core formed of stacked steel plates, each of which has a center hole, and a shaft inserted through the center hole of the core, in which method the shaft is deformed to fit an end plate in a state where the end plate is pressed against the core, the manufacturing method comprising deforming a deformed portion of the shaft that engages with an edge of the end plate, along a core-side edge portion and a no core-side edge portion of the edge of the end plate with respect to a thickness direction of the edge of the end plate to cause the deformed portion to be in the same shape as a shape of the edge of the end plate,
- wherein the shape of the deformed portion on the core side in the thickness direction of the edge of the end plate is such that the deformed portion fits in between the end plate and the core, so that a load in a direction of the core that occurs when the deformed portion is deformed on the no core side in the thickness direction of the edge of the end plate is received.
A manufacturing method of a rotor for an electric motor including a core formed of stacked steel plates, each of which has a center hole, and a shaft inserted through the center hole of the core, in which method the shaft is deformed to fit an end plate in a state where the end plate is pressed against the core, wherein:
- a deformed portion of the shaft that engages with an edge of the end plate is deformed along a core-side edge portion and a no core-side edge portion of the edge of the end plate with respect to a thickness direction of the edge of the end plate so that the deformed portion is formed into the same shape as the shape of the edge of the end plate;
- a first deforming punch for deforming the deformed portion so as to fit the core-side edge portion of the edge of the end plate, which is a portion of the edge on a core side with respect to an innermost position of the edge of the end plate, and a second deforming punch for deforming the deformed portion to fit the no core-side edge portion of the end plate, which is a portion on a side opposite to the core side with respect to the innermost position of the edge of the end plate, are used;
- and
- the manufacturing method includes:
- a first step of deforming the core-side edge portion with respect to the thickness direction of the edge of the end plate by the first deforming punch:
- and
- a second step of deforming the no core-side edge portion with respect to the thickness direction of the edge of the end plate by the second deforming punch while the first deforming punch is positioned at a deformation position.
A rotor for an electric motor including a core formed of stacked steel plates, each of which includes a center hole, and a shaft inserted into the center hole, in which rotor the shaft is deformed to fit an end plate in a state where the end plate is pressed against the core, wherein:
- a deformed portion of the shaft that engages with an edge of the end plate is deformed along a core-side edge portion and a no core-side edge portion of the edge of the end plate with respect to a thickness direction of the edge of the end plate to cause the deformed portion to be in the same shape as a shape of the edge of the end plate;
- and
- wherein the shape of the deformed portion on the core side in the thickness direction of the edge of the end plate is such that the deformed portion fits in between the end plate and the core, so that a load in a direction of the core that occurs when the deformed portion is deformed on a no core side in the thickness direction of the edge of the end plate is received.
Dependencies are inferred from the claim text.