Asmo Co., Ltd.

Kazunobu Kanno

Satoru Hamano

Shinsuke Muroi

Akihiro Suzuki

Kazushi Sugishima

Noriyuki Suzuki

Yuichi Terada

Masashi Yamamura

Yuuichi Terada

Toshiaki Yamada

Yoshiyuki Matsushita

Taketo Shimoda

Kouichi Nakamura

Mikio Kawamura

Masahiro Gotou

Toshio Yamamoto

Hideyuki Yagi

Nobuo Kasao

Takenobu Kawakami

Kenji Obata

Yoshiaki Matsuura

Kazuhiko Nagasaka

Nobuyuki Matsumoto

Tsuyoshi Kuribayashi

Kouji Takahashi

Katsuhiro Fujishima

Teruo Sato

Satoru Iwasaki

Koichi Nakamura

Nobuyuki Imai

Yoshihiko Kato

A coupling apparatus is provided with a first coupling member, a second coupling member and a damper member. The damper member is arranged between the first coupling member and the second coupling member. At least one of the first coupling member and the second coupling member has a tubular circumferential wall surrounding the outer circumference of the damper member. Accordingly, it is easy to control the diameter of an accommodating hole accommodating the coupling apparatus.

Coupling apparatus, motor device, and wiper motor device

A stator for a motor includes a stator core, an insulator, and coils. The stator core includes an annular portion and teeth, which extend radially from the annular portion. The stator core is divided into core segments in the circumferential direction. Each core segment has an arcuate portion and one of the teeth, which extends from the arcuate portion. The insulator insulates each coil wound around one of the teeth from the stator core. The insulator includes coupling portions at positions corresponding to the circumferential ends of the arcuate portions. Each coupling portion couples the adjacent core segments to be rotatable relative to each other. The insulator facilitates manufacture of the stator.

Insulator and manufacturing method thereof, and stator for electric rotating machine

A rotor of a motor includes a cylindrical rotor shaft that is formed through plastic working. The shaft includes a positioning portion that is formed in an inner peripheral surface of the cylindrical shaft by the plastic working of the shaft. The positioning portion is detachably engageable with a securing member, which is insertable into the shaft in an axial direction of the shaft to position the shaft in a circumferential direction. When the positioning portion is engaged with the securing member, relative rotation between the shaft and the securing member is limited.

Rotor and motor having the same

A cylindrical portion of a motor yoke has a securing portion to secure a stator core at an axial section except the axial ends of the cylindrical portion. When manufacturing the yoke, at first, a work is prepared that corresponds to the yoke before the securing portion is formed. A mandrel, which includes a forming portion, is then inserted into the work. The forming portion has an outer diameter smaller than the inner diameters of the axial ends of the cylindrical portion. Subsequently, the axial section of the cylindrical portion on which the securing portion is to be formed is pressed with dies from radially outside of the cylindrical portion toward the forming portion, thereby displacing the pressed section of the cylindrical portion radially inward and forming the securing portion on the work. As a result, the motor yoke with high accuracy is manufactured while reducing a waste of machining.

Method for manufacturing motor yoke, motor yoke, and motor

Commutator segments are divided into a plurality of groups, each of which includes two or more of the commutator segments. Generally planar short-circuiting parts are respectively provided to the groups of the commutator segments and are located radially inward of the commutator segments in such a manner that the short-circuiting parts are spaced one after the other in an axial direction of the commutator. Each short-circuiting part is seamlessly and integrally formed with and is electrically connected to a corresponding sub-element of each commutator segment of a corresponding one of the groups of the commutator segments, and at least one of the short-circuiting parts is located within an axial extent of at least one of power supply brushes measured in the axial direction of the commutator. A dielectric body securely holds each commutator segment and each short-circuiting part.

Commutator having short-circuiting parts, motor having such a commutator and method for manufacturing such a commutator

A method of manufacturing a commutator includes the steps of punching a commutator forming plate out of a plate member having a plurality of projections formed at predetermined intervals in such a way that the projections extend in parallel to one another, forming the commutator forming plate cylindrical and arranging the projections on an inner surface of the cylindrical commutator forming plate, filling an interior of the cylindrical commutator forming plate with a molten resin, segmenting the cylindrical commutator forming plate at predetermined angular distances after curing of the resin to thereby form commutator pieces, and positioning the plate member in a mold. The step of punching the commutator forming plate is carried out using a first punch having a plurality of recesses corresponding to the projections. Formed at those portions of each recess which correspond to both corner portions of each projection narrow portions that become narrower in a depth direction of that recess.

Method of manufacturing commutator, apparatus for manufacturing commutator, and commutator

A cup shaped yoke made of sheet material has an opening portion provided in a side wall on an axial end side, a shoulder portion provided in the sidewall on another axial end side, a magnet installation portion for installing a magnet, which is provided in the side wall between the opening and shoulder portions and whose wall thickness is substantially equal to thickness of the sheet material, and a bottom portion, which is provided in a bottom wall, having a boss shaped bearing accommodating portion in a center thereof. Each wall thickness of the opening, shoulder and bottom portions including the boss shaped bearing accommodating portion is equal to or smaller than a half of wall thickness of the magnet installation portion.

Method of manufacturing yoke of electric rotating machine

A rotor core includes a plurality of first core sheets and a plurality of second core sheets. The first core sheets and the second core sheets are laminated in the axial direction of the rotor core. Each first core sheet includes a plurality of first teeth laid out in a ring form on a same plane. Each second core sheet includes a plurality of second teeth laid out in a ring form on a same plane. Each first tooth is placed over the associated second tooth in the axial direction of the rotor core. Each tooth has a winding portion extending in the radial direction of the rotor core and an arm portion integrally provided at an outer end of the winding portion in the radial direction of the rotor core and extending in the peripheral direction of the rotor core. Each arm portion has a coupling portion at one end. Each first tooth is coupled to that one of the second teeth which is stacked on another first tooth adjoining in the peripheral direction of the rotor core by coupling of their coupling portions. A portion of each arm portion, which excludes the associated coupling portion, is located further apart from the axis of the rotor core than the associated coupling portion.

Rotor of electric motor and manufacturing method thereof

A plate material is drawn to form a first-drawing product in the shape of an elliptically cylindrical container having an elliptical cross section. Then, the first-drawing product is drawn to form a re-drawing product in the shape of a generally circular cylindrical container. Next, the re-drawing product is drawn to form a late-drawing product in the shape of an elliptically cylindrical container having an elliptical cross section in which a major axis and a minor axis of the elliptical cross section are reversed with respect to a major axis and a minor axis of the elliptical cross section of the first-drawing product. Thereafter, the late-drawing product is drawn to form a final product as a yoke.

Method of manufacturing yoke through multistage-drawing process

In a method of manufacturing a partly flat yoke having curved circumferential walls to which magnets are to be attached and having parallel flat circumferential walls which constitute main magnetic paths and whose each radial thickness is larger than that of the curved circumferential walls, by drawing a sheet of metal plate, the metal plate is held down between a die and projections of a wrinkle preventing plate provided at given angular positions around an outer circumference of a cavity of the die so as to correspond to the curved circumferential walls. Then, a punch presses down the metal plate into the cavity so that material of the metal plate extends axially into the cavity, while the material of the metal plate flows circumferentially from each side of the curved circumferential walls to sides of the parallel flat circumferential walls.

Method of manufacturing motor yoke

In a commutator forming plate to be rounded into a cylinder which is to be cut at constant angular intervals to form a plurality of commutator segments after being filled with insulating material, a plurality of lands rising at given intervals on one surface of a plate is provided and a plurality of projecting portions protruding nearly perpendicular to a rising direction of each of the lands are formed simultaneously by forming a plurality of grooves crossing with each other on the respective lands and extending so as to intersect obliquely with respective outer peripheries of the lands.

Commutator forming plate, commutator, motor with commutator and manufacturing the same

A crude work having a cylindrical boss formed integrally with a base plate is processed to a final product by a press work without using additional machining. An inner diameter of the boss is enlarged by a punch, and at the same time an outer diameter of the boss is shrunk by an outer die, while the work is supported on a cushion ring to which a force against the movement of the punch and the outer die is applied. Some of the material constituting the cylindrical boss is squeezed, and a bulge is formed at a foot of the cylindrical boss out of the material squeezed. Since the bulge is fromed in a confined space in the die structure, no crack or defect develops in or on the bulge. The bulge is further compressed by a press work to form a flat flange out of the bulge. The cylindrical boss having the flange formed integrally therewith is used as a center boss for holding a bearing of a rotary machine.

Method of forming a cylindrical boss and a die therefor

A method of adhering in advance a soldering material to a location on each of a plurality of claw-shaped portions of a commutator at which a winding for the armature of an electric motor is to be electrically connected thereto, for ensuring a strong and reliable electrical connection between the windings and the claw-shaped portions. A plurality of narrow grooves are defined in the claw-shaped portions and the narrow grooves are charged with molten soldering material, which solidifies therein. The thus-solidified soldering material is thereafter re-melted by heat produced at the time of resistance welding of the windings to the claw-shaped portions to thereby reinforce the electrical connection between the claw-shaped portions and the windings and to prevent an increase in the electric resistance between the windings and the claw-shaped portions.

Method of pre-applying soldering material to a motor commutator

A link rod of a wiper for a motor vehicle, comprising: a cylindrical section; a pair of flat sections formed at opposite ends of the cylindrical section, respectively by crushing the opposite ends of the cylindrical section from above and below; and a pair of resinous coupling joints mounted on the flat sections, respectively; wherein a first hole having a large diameter and a second hole having a small diameter are, respectively, formed at outer and inner portions of each of the flat sections as viewed in a longitudinal direction of the cylindrical section; wherein a gap opens into an axially intermediate portion of a peripheral surface of the second hole such that interior of the cylindrical section is communicated with a mouth of the second hole through the gap; wherein each of the coupling joints includes a joint portion disposed at the first hole and seals the second hole and the gap, and a method of manufacturing the link rod.

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Toyohashi, Japan

Kazunobu Kanno