# US 2021/0344260 A1 · Motor unit equipped with decelerator

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- Number: US 2021/0344260 A1
- Document ID: US20210344260A1
- Status: Published application
- Kind: A1
- Application number: 16/624,905
- Filed: 2018-07-31
- Published: 2021-11-04
- Earliest claimed: 2017-08-01
- Assignees: Mabuchi Motor Co., Ltd.
- Applicants: Mabuchi Motor Co., Ltd.
- Inventors: Junya Kurata; Satoshi Kikuchi; Yoshihiro Hanazawa
- Web page: https://patentgrep.com/patent/US20210344260A1

## CPC

- H02K 11/38: Control circuits or drive circuits associated with geared commutator motors of the worm-and-wheel type
- H02K 5/225: {Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132)}
- H02K 7/1166: {comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081)}
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- H02K 11/21: Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14)
- H02K 2211/03: Machines characterised by circuit boards, e.g. pcb
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A worm wheel is installed inside a wheel accommodation chamber of a body casing; a motor is fastened by screws from the right side perpendicular to the axis line of the worm wheel, thus forming a motor fastening part; and a worm fixed to an output shaft of the motor is engaged with the worm wheel. A board accommodation chamber is formed so as to be adjacent to the right of the wheel accommodation chamber, and a control board is inserted inside the board accommodation chamber from below. The control board is disposed so as to be inclined in a direction in which the upper end of the control board is displaced toward the wheel accommodation chamber from an erect attitude perpendicular to the axis line of the output shaft of the motor, and thus the upper end is separated from the motor fastening part in the direction of the axis line of the output shaft.

## Claims

### Claim 1

A motor unit equipped with a decelerator, the motor unit comprising:
a worm wheel provided in a wheel housing of a main body casing and rotatably supported around an axis;
a motor fastened to the main body casing with a fastening member from one side orthogonal to the axis of the worm wheel and in which a worm fixed to an output shaft meshes with the worm wheel;
a board housing defined by the main body casing so as to be adjacent to the wheel housing on the one side of the wheel housing; and
a control board provided in the board housing in a posture of crossing an axis of the output shaft of the motor, electrically connected to the motor, and including, on the one side, a connector to be connected outside, wherein:
the control board is inclined from a posture orthogonal to the axis of the output shaft of the motor toward a direction in which a position of an end portion on a motor side is displaced toward a side opposite to the one side, so that the end portion on the motor side is apart from a fastening portion including the fastening member in a direction of the axis of the output shaft.

### Claim 2 (depends on 1)

The motor unit according to claim 1, wherein
the board housing has an opening on a side opposite the motor, a connector cover included in the connector is detachably provided on the board housing so as to close the opening, and the control board is inserted into the board housing from the side opposite the motor through the opening along a plate surface.

### Claim 3 (depends on 2)

The motor unit according to claim 2, wherein
a waterproof packing is interposed between the opening of the board housing and the connector cover.

### Claim 4 (depends on 2)

The motor unit according to claim 2, wherein
the opening of the board housing is open in an oblique direction toward the side opposite the motor and the one side,
a connector terminal included in the connector together with the connector cover protrudes from the control board toward the one side through the opening, and
the connector cover includes the connector terminal and is provided in the opening of the board housing from the one side so as to close the opening.

### Claim 5 (depends on 1)

The motor unit according to claim 1, wherein
the control board includes a board-side terminal in a portion on the motor side of the control board and is electrically connected to the motor by fitting a motor-side terminal of the motor fastened to the main body casing into the board-side terminal from the one side, and
because of the inclination of the control board, a position of the board-side terminal and the position of the end portion on the motor side of the control board are displaced toward the side opposite to the one side.

### Claim 6 (depends on 2)

The motor unit according to claim 2, wherein
the control board includes a board-side terminal in a portion on the motor side of the control board and is electrically connected to the motor by fitting a motor-side terminal of the motor fastened to the main body casing into the board-side terminal from the one side, and
the board housing includes a terminal guide portion that corrects the position of the board-side terminal of the control board inserted from the side opposite the motor through the opening.

### Claim 7 (depends on 2)

The motor unit according to claim 2, wherein
the control board includes a board-side terminal in a portion on the motor side of the control board and is electrically connected to the motor by fitting a motor-side terminal of the motor fastened to the main body casing into the board-side terminal from the one side, and
the board housing includes a board position regulating portion that, when the motor-side terminal is fitted into the board-side terminal, abuts against the control board from the side opposite to the one side in the vicinity of the board-side terminal and regulates a position of the control board.

### Claim 8 (depends on 2)

The motor unit according to claim 2, wherein
the control board includes a board-side terminal in a portion on the motor side of the control board and is electrically connected to the motor by fitting a motor-side terminal of the motor fastened to the main body casing into the board-side terminal from the one side, and
the board housing includes a terminal position regulating portion that, when the motor-side terminal is fitted into the board-side terminal, abuts against the board-side terminal from the side opposite to the one side and regulates a position of the board-side terminal.

### Claim 9 (depends on 2)

The motor unit according to claim 2, wherein
because of the inclination of the control board, a portion on the side opposite the motor of the board housing is separated from the wheel housing toward the one side, and, in a space secured by the separation, a locking portion that allows one side of the connector cover to be detachable is provided.

### Claim 10 (depends on 1)

The motor unit according to claim 1, wherein
the wheel housing is defined in such a manner that one side surface along the axis of the worm wheel is closed by a cover member, and
because of the inclination of the control board, a portion on the side opposite the motor of the board housing is separated from the wheel housing toward the one side, and, in a space secured by the separation, a circumference of the cover member is joined with a circumference of the wheel housing by a crimping process.