Asmo Co., Ltd.

Youichi Matsuyama

Tadashi Adachi

Hiroaki Yamamoto

Kengo Yamamura

Hiroshi Kokubu

Wataru Kanou

Toshihiro Saitou

Naoki Imamura

Kazuaki Tsujita

A connector housingis formed separately from a gear housingand a closing and fixing member. The connector housingincludes a retainer, which supports an external connectorrelative to the closing and fixing member, and an elastically deformable grommet. A retainer-side end of the grommetis interposed between a flange portion of the retainerand an outer surface of the closing and fixing member, and the connector housingis secured to a connector installation opening. With this construction, it is possible to achieve a high degree of design freedom and to provide a motor having a drip-proof structure of a relatively simple configuration.

Motor and method of manufacturing the same

A motor has a board-retaining part that is attached in an opening portion of a gear housing with a circuit board received in the board-installing portion of the gear housing and that restricts the circuit board to move to a counter-insertion side thereof in an insertion direction of the circuit board. The board-retaining part can be attached to any position not to bring that in contact with the cover member in the direction of the center axis. Thus, in a case of installing the circuit board through the opening portion of the gear housing and blocking the opening with the cover member, it is possible to secure a seal quality of the cover member and to prevent the circuit board from rattling even when a dimensional error is introduced both in approximating and detaching directions of the circuit board and the cover member.

Motor

An end surface portionof a gear housing, which is located on a motor unitside of the gear housing, is opposed to the motor unitand laterally extends. A brush holderincludes a plate portionthat is opposed to the end surface portion. A case, which receives the control circuit board, is formed separately from the plate portion. A receiving through hole, through which the circuit board receiveris receivable, is formed in the plate portion. The caseis constructed to be positionable next to the yokein a state where the caseis received through the receiving through hole. The yoke, the gear housing, the brush holder, the control circuit boardand the caseare assembleable in a direction parallel to an axial direction of the motor unit. The control circuit boardprojects from the gear housingon the motor unitside, and a projected part of the control circuit board, which projects from the gear housing 8 on the motor unitside, is received in the case. In this way, in the motor that integrally includes the motor unit, the speed reducing unit and the control circuit board, the gear housing of the speed reducing unit can be made compact, and the assembly work can be simplified.

A control circuit board is held in a gear housing of a motor, and a connector housing is connected to the gear housing. The connector housing is formed separately from the gear housing and includes a plurality of connection terminals that are secured to the connector housing. The connection terminals of the connector housing are connected with electric circuit components of the control circuit board. The connection terminals are also connected with corresponding terminals of an external connector when the external connector is connected to the connector housing.

Motor having connector housing

A motor includes a motor unit and a speed reducing unit. The speed reducing unit has a gear housing. The gear housing includes a circuit board receiving portion and an opening that faces the motor unit. A control circuit board is received in the circuit board receiving portion through the opening in an axial direction of a rotatable shaft. When the motor unit is assembled to the speed-reducing unit, the control circuit board is clamped between the speed-reducing unit and a cover connected to the motor unit.

Motor having control circuit board for controlling its rotation

A rotatable shaft of a motor main body and a worm shaft of a speed reducing unit are drivingly coupled to each other by a clutch. Surrounding walls, which are arranged radially outward of the clutch to substantially entirely surround the clutch in an imaginary plane that extends substantially perpendicular to the axis of the worm shaft, are formed integrally with a gear housing. Thus, the surrounding walls restrain outward movement of grease, which is applied to predetermined portions of the clutch, so that effluence of the grease from the clutch is restrained.

Motor having motor main body and speed reducing unit

The structure for fixing a grommet to a housing is composed of a housing provided with a connector portion formed at least partly in a column shape, a wire harness connector coupled with the connector portion with a coupling gap and a tubular shaped grommet made of resilient material put on an outside circumferential surface of the connector portion to waterproof seal the coupling gap. The grommet includes a wall with openings that snap over protrusions on the connector portion to rigidly fix them together. The connector portion includes a locking through hole for receiving a latch on the wire harness connector. Seal lips on the grommet are angled downward so as to provide sealing for the locking hole.

Structure for fixing grommet to motor housing and motor unit having such structure

A terminal for supplying power to a motor portion is inserted in a housing formed by molding resin, and both ends of the terminal are exposed from the housing. When the housing is molded, an insulation member such as first and second plates contacts a die for forming the housing, and the terminal is engaged with the insulation member before the housing is molded, so that an attachment position of the terminal is set relative to the die through the insulation member. The insulation member is inserted in the housing together with the terminal by pouring melted resin in the die. Thus, the housing in which the terminal is inserted can be readily molded, and it can prevent liquid from being introduced to the terminal in the housing.

Growing community of inventors

Shinshiro, Japan

Youichi Matsuyama