# US 11,895,947 B2 · Mower with motor cooling arrangement

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- Number: US 11,895,947 B2
- Document ID: US11895947B2
- Status: Granted
- Kind: B2
- Application number: 16/955,101
- Filed: 2017-12-22
- Published: 2020-12-10
- Granted: 2024-02-13
- Earliest claimed: 2017-12-22
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Kenta Nishimura; Yasumi Fukuzumi; Yoshihiro Takahashi; Koki Tsuruda; Fumio Minami
- Web page: https://patentgrep.com/patent/US11895947B2

## CPC

- A01D 34/81: Casings; Housings (A01D34/71 takes precedence)
- A01D 34/68: with motor driven cutters or wheels
- A01D 34/828: {Safety devices}
- A01D 75/18: Safety devices for parts of the machines
- H02K 5/207: {with openings in the casing specially adapted for ambient air}
- H02K 9/04: having means for generating a flow of cooling medium
- H02K 9/06: with fans or impellers driven by the machine shaft
- A01D 34/78: electric
- A01D 75/187: {Removing foreign objects}
- A01D 2101/00: Lawn-mowers
- A01D: HARVESTING; MOWING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A mower comprises: a cutter housing having an inner hole in which an output shaft of a motor is inserted; and a motor cover provided above the cutter housing with a space therebetween, the motor cover covering the motor. Cooling air leadout openings for leading cooling air in the motor cover to the outside are formed in the motor cover, the cooling air leadout openings being positioned inward of a peripheral wall part of the motor cover and outward of the inner hole of the cutter housing.

## Claims

### Claim 1

A lawn mower including a motor configured to rotate a cutter blade, the lawn mower comprising:
a cutter housing including an inner hole through which an output shaft of the motor is inserted; and
a motor cover disposed above the cutter housing with a space interposed therebetween, the motor cover covering the motor,
wherein the motor cover has formed therein at least one cooling air exit port configured to discharge cooling air in the motor cover to outside, and
the at least one cooling air exit port is positioned further inward than a peripheral wall of the motor cover,
the at least one cooling air exit port is positioned further outward than the inner hole of the cutter housing in a radial direction of the motor, thereby the at least one cooling air exit port being covered by the cutter housing from below, and
part of cooling air flowing out of the at least one cooling air exit port flows into the cutter housing via the space between the cutter housing and the motor cover.

### Claim 2 (depends on 1)

The lawn mower according to claim 1, wherein left and right sides of the motor cover are respectively provided with the at least one cooling air exit port.

### Claim 3 (depends on 1)

The lawn mower according to claim 1, wherein the at least one cooling air exit port is directed outward in the radial direction of the motor.

### Claim 4 (depends on 1)

The lawn mower according to claim 1, wherein the at least one cooling air exit port is positioned further radially outward than the motor.

### Claim 5 (depends on 1)

The lawn mower according to claim 1, wherein an inner bottom surface of the motor cover forms an inclined surface that is inclined downward from a side where the motor is positioned toward the at least one cooling air exit port.

### Claim 6 (depends on 1)

The lawn mower according to claim 1,
wherein the motor cover includes:
a lower cover covering the motor from below; and
an upper cover that is configured to be attached to and removed from the lower cover and that covers a side of the motor.