Hand pushed lawn mower

Patent metadata

Field	Value
Publication number	US-2016338266-A1
Application number	US-201615153066-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	May 20, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

A hand pushed lawn mower includes a power unit including a motor and a circuit board, a support device for supporting the power unit, and a fan that rotates about a rotating axis. The power unit is detachably connected with the support device and includes a power unit housing. The power unit housing includes a containing chamber for containing the motor and the circuit board, an air inlet allowing an air flow to flow into the containing chamber, and an air outlet allowing the air flow to flow out of the containing chamber. When the fan is rotated, the air flow which flows into the containing chamber from the air inlet at least passes in contact with the circuit board and then flows out of the containing chamber through the air outlet.

First claim

What is claimed is:

1 . A hand pushed lawn mower, comprising:
a power unit comprising a motor and a circuit board; a support device for supporting the power unit; and a fan that rotates about a rotating axis; wherein the power unit is detachably connected with the support device and comprises a power unit housing, the power unit housing comprising:
a containing chamber for containing the motor and the circuit board;
an air inlet allowing an air flow to flow into the containing chamber; and
an air outlet allowing the air flow to flow out of the containing chamber; and
wherein, when the fan is rotated, the air flow which flows into the containing chamber from the air inlet at least passes in contact with the circuit board and then flows out of the containing chamber through the air outlet.

2 . The hand pushed lawn mower of claim 1 , wherein the air flow which flows into the containing chamber from the air inlet at least passes through the motor and then flows out of the containing chamber through the air outlet.

3 . The hand pushed lawn mower of claim 1 , wherein the air flow which flows into the containing chamber from the air inlet and flows out of the containing chamber through the air outlet at least passes through the circuit board and the motor in turn.

4 . The hand pushed lawn mower of claim 1 , wherein the motor comprises a coil and a motor housing and wherein the coil and the fan are contained within the motor housing.

5 . The hand pushed lawn mower of claim 1 , further comprising a cutting element for cutting grass, wherein the support device is formed with a cutting chamber for containing the cutting element and the fan is contained within the cutting chamber or the containing chamber.

6 . A hand pushed lawn mower, comprising:
a power unit comprising a motor and a circuit board; a support device for supporting the power unit; and a fan that rotates about a rotating axis; wherein the power unit further comprises a power unit housing, the power unit housing comprising:
a containing chamber for containing the motor and the circuit board;
an air inlet allowing an air flow to flow into the containing chamber; and
an air outlet allowing the air flow to flow out of the containing chamber and
wherein the motor is positioned between the air inlet and the air outlet, and the air flow which passes through the air inlet and the air outlet flows through the motor.

7 . A hand pushed lawn mower of claim 6 , wherein the containing chamber is at least partially located above the air inlet and the circuit board is located above the air inlet.

8 . A hand pushed lawn mower of claim 7 , wherein the fan is located outside of the power unit housing, the motor comprises a motor housing for connecting with the power unit housing and a motor shaft that rotates relative to the motor housing, the motor housing is respectively formed with through holes on its two sides adjacent to the air inlet and the air outlet, and the motor shaft is connected with the fan.

9 . A hand pushed lawn mower of claim 8 , further comprising a cutting element for cutting grass, wherein the support device comprises a support housing, the support housing is formed with a cutting chamber for containing the cutting element, the cutting chamber is opened downwardly, the power unit housing is at least partially positioned in the cutting chamber, the air outlet is communicated with the cutting chamber, and the fan is positioned within the cutting chamber.

10 . A hand pushed lawn mower of claim 7 , wherein the fan is a centrifugal fan, and the air outlet is located in a negative pressure area of the centrifugal fan.

11 . A hand pushed lawn mower of claim 7 , further comprising a plurality of battery packs, and the power unit housing is provided with a corresponding plurality of battery chambers for containing the plurality of battery packs.

Assignees

• Chervon Hk Ltd

Inventors

• Yamaoka toshinari
• Nie Fangjie
• Xu Haishen

Classifications

• A01D34/78 Primary

  electric · CPC title

• A01D34/82 Primary

  Other details · CPC title

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/6806

  Driving mechanisms (for the cutters A01D34/76) · CPC title

• A01D34/81

  Casings; Housings (A01D34/71 takes precedence) · CPC title