Robot lawnmower

Patent metadata

Field	Value
Publication number	US-11864495-B2
Application number	US-202117203563-A
Country	US
Kind code	B2
Filing date	Mar 16, 2021
Priority date	Mar 16, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

Disclosed is a robot lawnmower including a body frame, a main wheel disposed on both sides of the body frame, a motor to drive the main wheel, a first edge blade provided in a region of the body frame corresponding to the main wheel and coupled to be rotatable with respect to the body frame by receiving a driving force of the motor, and a second edge blade disposed between the body frame and the main wheel to rotate together with the main wheel and cut a grass by a relative rotation of the first edge blade and the main wheel.

First claim

What is claimed is:

1. A robot lawnmower comprising:
a body frame;
a main wheel disposed on both sides of the body frame;
a motor to drive the main wheel;
a first edge blade provided in a region of the body frame corresponding to the main wheel and coupled to be rotatable in a rotational direction opposite of a rotational direction of the main wheel with respect to the body frame by way of a driving force received from the motor; and
a second edge blade disposed between the body frame and the main wheel to rotate in an identical rotational direction of the rotational direction of the main wheel and cut grass by a relative rotation of the first edge blade and the main wheel, wherein the relative rotation of the first edge blade is a rotational motion opposite of a rotational motion of the second edge blade.

2. The robot lawnmower of claim 1 , wherein the first edge blade comprises a ring gear rotatable with respect to the body frame.

3. The robot lawnmower of claim 2 , wherein the ring gear comprises a ring gear groove formed on an outer circumferential surface thereof, and the body frame comprises a mounting part coupled to the ring gear groove and configured to rotatably support the ring gear.

4. The robot lawnmower of claim 2 , wherein
the motor is further configured to rotate a main wheel driving shaft to connect the motor and rotate the main wheel,
wherein a sun gear is formed on an outer circumferential surface of the main wheel driving shaft.

5. The robot lawnmower of claim 4 , further comprising a planetary gear engaged between the sun gear and the ring gear to rotate.

6. The robot lawnmower of claim 5 , wherein the ring gear and the main wheel rotate in opposite directions.

7. The robot lawnmower of claim 5 , further comprising a planetary gear box formed inside of the body frame and to which a planetary gear rotation shaft extending from the planetary gear is rotatably coupled.

8. The robot lawnmower of claim 2 , wherein the first edge blade comprises a plurality of first protruding edges protruding from a rim of the ring gear toward the main wheel.

9. The robot lawnmower of claim 8 , wherein the second edge blade comprises a plurality of second protruding edges formed along a rim of the main wheel to correspond to the first edge blade and protruding from an inner rim of the main wheel toward the body frame.

10. The robot lawnmower of claim 9 , wherein the plurality of first protruding edges and the plurality of second protruding edges protrude in a direction parallel to a rotation shaft of the main wheel.

11. The robot lawnmower of claim 8 , wherein each of the plurality of first protruding edges comprises a first inclined surface.

12. The robot lawnmower of claim 11 , wherein each of a plurality of second protruding edges comprises a second inclined surface spaced apart from and facing the first inclined surface.

13. The robot lawnmower of claim 12 , wherein:
the plurality of first protruding edges is formed to be spaced apart from each other along the rim of the ring gear, and
the plurality of second protruding edges each corresponds to the plurality of first protruding edges and is formed to be spaced apart from each other along the rim of the main wheel.

14. The robot lawnmower of claim 1 , wherein:
the main wheel comprises a plurality of main wheels disposed on both sides of the body frame,
the robot lawnmower further comprises a main blade disposed between the plurality of main wheels and rotatably provided on a bottom of the body frame, and a second motor fixed to the body frame configured to rotate the main blade, and
the main blade comprises a rotating plate coupled to the second motor and configured to rotate, and a plurality of blades protruding from a rim of the rotating plate.

15. The robot lawnmower of claim 14 , comprising:
a first region in which grass is cut by the main blade; and
a second region adjacent to both sides of the first region and in which grass is cut by the first edge blade and the second edge blade.

16. A robot lawnmower comprising:
a body frame on which a main wheel is disposed on both sides thereof;
a first edge blade comprising a plurality of first protruding edges protruding from the body frame toward the main wheel and configured to be rotatable in a rotational direction opposite a rotational direction of the main wheel; and
a second edge blade formed along a rim of the main wheel and comprising a plurality of second protruding edges protruding from the main wheel toward the body frame to correspond to the first edge blade and configured to be rotatable in an identical rotational direction of the rotational direction of the main wheel.

17. The robot lawnmower of claim 16 , wherein:
the first edge blade comprises a ring gear rotatable with respect to the body frame,
the plurality of first protruding edges protruding from a rim of the ring gear,
the ring gear comprises a ring gear groove formed on an outer circumferential surface thereof, and
the body frame comprises a mounting part coupled to the ring gear groove configured to rotatably support the ring gear.

18. The robot lawnmower of claim 17 , wherein:
the plurality of first protruding edges is each spaced apart from each other to be disposed along the rim of the ring gear and each comprises a first inclined surface, and
the plurality of second protruding edges is spaced apart from each other to correspond to the plurality of first protruding edges and to be disposed along the rim of the main wheel, and each comprises a second inclined surface spaced apart from and facing the first inclined surface.

19. The robot lawnmower of claim 18 , further comprising:
a motor configured to rotate the main wheel;
a main wheel driving shaft connecting the motor and the main wheel and comprising a sun gear formed on an outer circumferential surface thereof; and
a planetary gear engaged between the main wheel driving shaft and the ring gear to rotate.

20. The robot lawnmower of claim 19 , further comprising a planetary gear box formed inside of the body frame so that the ring gear and the main wheel rotate in opposite directions and to which a planetary gear rotation shaft extending from the planetary gear is rotatably coupled.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Yoon Jinwook
• Bae Hyunki
• Kang Hyunkoo
• Kim Taegyu
• Seo Wonyoung

Classifications

• A01D43/16 Primary

  with lawn edgers · CPC title

• A01D34/008 Primary

  for automated or remotely controlled operation · CPC title

• A01D34/56

  Driving mechanisms for the cutters · CPC title

• A01D2101/00

  Lawn-mowers · CPC title

• B25J11/008 Primary

  Manipulators for service tasks · CPC title