US 11,867,309 B2
Throttle valve device and method for magnetizing the same
Makoto Uno, Tokoname (JP); Yasushi Kawano, Tokoname (JP); Kenichi Ishihara, Tokoname (JP); Tohru Shimizu, Tokoname (JP); and Yuta Fujinaka, Tokoname (JP)
Assigned to DENSO DAISHIN CORPORATION, Tokoname (JP); and DENSO CORPORATION, Kariya (JP)
Filed by DENSO DAISHIN CORPORATION, Tokoname (JP); and DENSO CORPORATION, Kariya (JP)
Filed on Aug. 13, 2020, as Appl. No. 16/992,173.
Claims priority of application No. 2019-155001 (JP), filed on Aug. 27, 2019.
Prior Publication US 2021/0062931 A1, Mar. 4, 2021
Int. Cl. F16K 3/04 (2006.01); F02D 9/10 (2006.01); F02M 26/70 (2016.01); F02M 26/72 (2016.01); H02K 7/00 (2006.01); H02K 7/08 (2006.01); F02M 26/54 (2016.01); F16K 31/04 (2006.01)
CPC F16K 31/04 (2013.01) [F02D 9/1005 (2013.01); F02D 9/1035 (2013.01); F02D 9/1065 (2013.01); F02M 26/54 (2016.02); F02M 26/70 (2016.02); F02M 26/72 (2016.02); H02K 7/003 (2013.01); H02K 7/08 (2013.01); F16K 31/047 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A throttle valve device, comprising:
a body that defines a passage, a motor space, and a connecting portion that connects the motor space to the passage;
a valve that is disposed in the passage and is configured to control a flow rate by adjusting a passage area of the passage;
a motor that is disposed in the motor space and is configured to generate a driving force for the valve to rotate; and
a cover that covers an open end of the body, wherein
the motor includes:
a motor yoke made of a magnetic material;
a plurality of magnets that are arranged on an inner circumferential surface of the motor yoke;
a motor shaft that is disposed inside the motor yoke;
a pair of motor bearings that rotatably support the motor shaft;
an armature core that is coupled to the motor shaft in the motor yoke;
a commutator that is coupled to the motor shaft in the motor yoke;
a brush that is configured to energize the commutator; and
a brush holder that holds the brush,
the plurality of magnets are magnetized in a state where the motor yoke is disposed in the motor space of the body,
the plurality of magnets are arranged in a circumferential direction in the motor yoke,
a space is defined between the plurality of magnets in the circumferential direction, wherein the space is different from the inherent gap that is between each one of the plurality of magnets, and
the connecting portion is aligned with the space defined between the plurality of magnets in a radial direction of the motor yoke.