BACKGROUND

As a basic operation of lawn trimming, mowing requires the use of simple and efficient mowing machinery to complete the mowing task with guaranteed quality and quantity. Lawn mowers have been widely used in the trimming of various kinds of lawns. As the functional element of the lawn mower, the structural design of the blade greatly affects the cutting performance of the lawn mower.

Lawn mowers can be divided into engine-driven and motor-driven by energy source. Among them, the motor-driven lawn mower generally uses battery packs as an energy source, which has the advantages of less noise and pollution. However, considering the load problem, the motor-driven lawn mower in the related art has an unreasonable blade structure, which results in a large load on the motor and a low cutting efficiency.

SUMMARY

The present application provides a lawn mower with a smaller motor load and higher cutting efficiency.

An example provides a lawn mower, including: a blade assembly configured to perform a cutting function; a deck formed with an accommodation space for accommodating at least a portion of the blade assembly; a motor configured to drive the blade assembly to rotate about a rotation axis; and a battery pack configured to provide power source for the motor. The blade assembly includes: a first cutting portion configured to cut grass; and a second cutting portion configured to cut grass; wherein in the direction parallel to the rotation axis, the second cutting portion is located below the first cutting portion. The battery pack includes a battery pack housing and battery cells provided in the battery pack housing. The maximum length of a line connecting any two points of the projection of the blade assembly in a plane perpendicular to the rotation axis and the projection of the rotation axis in the plane is the rotation diameter of the blade assembly. The product of the rotation diameter D (mm), the number N of battery cells included in the battery pack, and the mass M (g) of the blade assembly is greater than or equal to 3.5×105(mm·g) and less than or equal to 7.3×107(mm·g).

