Rotor and method for manufacturing rotor
AssigneeToyota Boshoku Kabushiki Kaisha
InventorsMakoto Kitahara, Masaki Sugiyama
Life of this patent
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Abstract
A rotor includes a rotor core including multiple housing holes, multiple magnets accommodated in the housing holes, and multiple plastic portions. Each plastic portion is formed by plastic that fills corresponding one of the housing holes and fixes the corresponding magnet to the rotor core. Each plastic portion includes an end face exposed from an opening of the corresponding housing hole. A gate mark is formed in the end face. A quotient obtained by dividing an area of the end face of each plastic portion by an area of the gate mark is in a range of 24 to 150.
Claims5
A rotor, comprising:
- a rotor core including multiple housing holes;
- multiple magnets accommodated in the housing holes;
- and
- multiple plastic portions, each plastic portion being formed by plastic that fills corresponding one of the housing holes and fixes the corresponding magnet to the rotor core, wherein
- each plastic portion includes an end face exposed from an opening of the corresponding housing hole,
- a gate mark is formed on the end face of each plastic portion, the gate mark being a trace created when a plastic gate portion formed in a gate passage of a plastic filling device is separated during a process of filling the housing hole with the plastic through the gate passage, and
- a quotient obtained by dividing an area of the end face of each plastic portion by an area of the gate mark is in a range of 24 to 150.
A method for manufacturing a rotor, the rotor including
- a rotor core including multiple housing holes;
- multiple magnets accommodated in the housing holes;
- and
- multiple plastic portions, each plastic portion being formed by plastic that fills corresponding one of the housing holes and fixes the corresponding magnet to the rotor core, wherein
- the method for manufacturing the rotor comprises:
- filling each housing hole with the plastic through a gate passage of a plastic filling device and openings of the housing holes, the plastic filling device being arranged adjacent to an end face of the rotor core;
- and
- setting an area of each opening and a cross-sectional area of the gate passage such that a quotient obtained by dividing the area of the opening by the cross-sectional area of the gate passage is in a range of 24 to 150.
Dependencies are inferred from the claim text.