Dimaag-ai, Inc.

David Beard

Ian Wright

David Kieke

Low-noise electric lawnmowers comprise curved cutting blades. In some examples, a lawnmower comprises a driving unit and a mowing unit with a mowing-unit deck. The mowing-unit deck comprises a set of blade units (e.g., 3 units) and a discharge conduit. Each blade unit comprises a blade enclosure and a cutting blade with a cutting edge having a curved shape. For example, the cutting edge, at a point furthest away from the blade center axis, may form an approach angle of greater than 90° but be less than 90° closer to the blade center. This curving aspect allows operating the blade at lower rotating speeds (e.g., less than 3,000 RPM), which reduces the turbulence and noise. In some examples, the blade enclosure forms an enclosure tunnel such that the tunnel's cross-sectional area increases from the tunnel's inlet to the outlet.

Low-noise electric lawnmowers with curved cutting blades

Electric lawnmowers comprise drive units and mowing units disengageably coupled to the drive units. For example, a drive unit can be disengageably coupled to any one of multiple mowing units (e.g., rotating mowing units, reel mowing units) collecting forming a mowing system. For example, each of the drive and mowing units may be equipped with corresponding mechanical-engagement structures that are configured to be disengageably coupled. Each mowing unit is equipped with its electric motor (e.g., for rotating the cutting blades or the reel of that unit). The electric motor may comprise an electric connector, which is disengageably coupled to the drive unit's electrical wiring. In some examples, each mowing unit can also form a liquid disengageable coupling for circulating a thermal liquid between the drive unit and mowing unit, e.g., for cooling various components of the drive unit.

Electric lawnmowers with interchangeable mowing units and methods of operating thereof

Electric lawnmowers comprise mowing-unit decks with fluid passages used for cooling batteries, power electronics units, and/or drive motors. Specifically, a lawnmower comprises a drive unit (with a battery, power electronics, and one or more drive motors) and a mowing unit (with a mowing-unit deck). The deck's fluid passage is fluidically coupled to the drive unit (e.g., the motor and power electronics). The thermal liquid is heated by the drive unit's components and cooled as the liquid passes through the deck's fluid passage. The mowing unit may be equipped with a pump (for circulating this liquid), which can be powered by an electric motor on the mowing unit. The same motor may be used for rotating the cutting blades. The drive unit may have an additional cooling circuit providing immersion cooling to the batteries.

Growing community of inventors

Alameda, CA, United States of America

David Beard