Nanjing Chervon Industry Patente

A portable circular saw for cutting metal includes a base including a lower surface side abutting against a cut material and a cutter body at least partially supported on the upper surface side of the base. The cutter body includes a circular saw blade, a fixed shield covering the outer circumferential side of the circular saw blade, and a metal chip guide tube disposed in the fixed shield, surrounding part of the outer circumferential side of the circular saw blade, and including a chip guide cavity for guiding a chip. The ratio of the outer surface area S1 of the metal chip guide tube to a surface area S2 of the metal chip guide tube covered by the fixed shield is higher than 1.

An inflator includes a motor, a power mechanism, at least one air vent, and a main housing. The power mechanism is driven by the motor and configured to generate airflow. The air vent is connected to a flexible duct for air intake and/or air discharge to allow the airflow to flow. The main housing accommodates the motor and the power mechanism and has a battery coupling portion, where a battery pack that provides a power supply for the motor is capable of being detached from or mounted to the battery coupling portion. The main housing further has a first coupling portion configured to detachably connect an illumination device. The illumination device is capable of illuminating a working region of the inflator.

A fastener driver includes a striking assembly including a striking member configured to strike a fastener; a drive assembly configured to drive the striking member; and an electric motor providing a driving force for at least the drive assembly. The drive assembly includes a drive wheel configured to engage with the striking member to drive the striking member to move along the extension direction of the striking member. The distance D from the centroid of the drive wheel to the rotation axis of the drive wheel is less than or equal to 1.5 mm. In this manner, the regular wobbles of the fastener driver can be reduced, thereby improving the user's operating feel.

A clamping device includes a shaft body including an axial opening and at least one hole, where the axial opening extends along a first straight line; at least one retainer, where each of the at least one retainer is configured to move within a respective hole of the at least one hole; a sleeve sleeved on the outer circumference of the shaft body and configured to move axially relative to the shaft body; an abutting member abutting against the rear side of the at least one retainer; a first elastic member located on the front side of the at least one retainer; and a second elastic member located on the rear side of the at least one retainer and being in contact with the abutting member. The sleeve includes a protrusion extending along a second straight line, and the protrusion abuts against the shaft body, where the second straight line intersects with the first straight line. Along the direction of the first straight line, the protrusion is located at the front end of the at least one retainer and is not in contact with the at least one retainer.

A charger includes: a housing; a charging interface configured to be electrically connected to a first battery pack; a direct current power interface configured to be electrically connected to a second battery pack; and a drive assembly accommodated in the housing and configured to supply power to the charging interface. The drive assembly is electrically connected to the charging interface and the direct current power interface and is configured to transfer electric energy from the second battery pack to the first battery pack, the maximum output power of the drive assembly is greater than or equal to 2000 W, and the first battery pack and the second battery pack are detachably connected to the charger, so as to be detached and then mounted to a power tool and supply power to the power tool.

A wheeled work vehicle includes: a walking mechanism including walking wheels and a walking motor for driving the walking wheels; a work mechanism for performing a function of the wheeled work vehicle; a power supply assembly at least configured to power the walking motor; a temperature acquisition unit at least configured to acquire an operating temperature of the walking motor; a driver circuit connected to at least the walking motor to drive the walking motor; and a controller electrically connected to the temperature acquisition unit and the driver circuit, where the controller is configured to output a target instruction to the driver circuit so as to control an input signal of the walking motor. The controller is further configured to, when a parameter of the walking motor related to the operating temperature exceeds a preset range, adjust the target instruction to gradually reduce the input of the walking motor.

Provided are a handheld power tool and a chainsaw. After the battery pack is mounted on the handheld power tool, in the case where the handheld power tool does not satisfy the balance requirement, the electric motor does not start, thereby avoiding safety risks or an impact on the working effect during operation.

A pressure washing apparatus includes a body and a spray gun connectable to the body; where the body includes a housing; a power unit located in the housing and including an electric motor for making the spray gun spray a liquid; a power supply device including at least one battery pack to power the electric motor; and a grip for a user to hold to carry and move the pressure washing apparatus. When the pressure washing apparatus is in operation, a maximum value of a product of pressure and a flow rate of the liquid sprayed from the spray gun is greater than or equal to 2000 PSI·GPM; and the volume of the body is less than or equal to 0.032 m³.

Provided is a battery pack, including: multiple cells; a cell bracket configured to support the multiple cells; and a terminal assembly electrically connected to the multiple cells and configured to be coupled to an interface of a power tool. The cell bracket is at least partially exposed to an external environment, and the thermal conductivity of the cell bracket is higher than or equal to 0.5 W/(m·K). The temperature of the battery pack can be accurately detected, the cycling efficiency of the battery pack is ensured, and the risk of explosion caused by thermal runaway of the battery can be eliminated.

Provided is a power tool including an electric motor including multi-phase windings; a driver circuit electrically connected to the electric motor; a controller electrically connected to the driver circuit and configured to output control signals to the driver circuit; a detection assembly communicatively connected to the controller and configured to detect a working state of the power tool; and a battery pack interface configured to be electrically connected to a battery pack. The battery pack interface includes a terminal assembly, which includes electrode terminals and a signal terminal. The controller is configured to acquire a real-time state parameter of the battery pack through the signal terminal or the detection assembly; acquire a load parameter of the electric motor through the detection assembly; and determine a conduction band and/or an advanced angle of the multi-phase windings according to the real-time state parameter and the load parameter.

A battery pack includes a housing; a cell assembly including n cell units connected in series; a sampling circuit including n sampling terminals connected to the n cell units in one-to-one correspondence; and a processor electrically connected to the sampling circuit and used for monitoring the state of the cell assembly. The processor is configured to, when receiving a sampling instruction, sample the n sampling terminals to acquire pieces of sampling data and determine the voltages of the n cell units or the voltage of the battery pack based on the pieces of sampling data. The sampling time interval t1 between two adjacent samplings has a value range of 10µs ≤ t1 ≤ 50µs.

A power tool includes a first electric motor including a first drive shaft rotating about a first axis; and a second electric motor including a second drive shaft rotating about a second axis; where torque of the first drive shaft and torque of the second drive shaft are output through an output shaft. The power tool includes switchable working modes, and the working modes include an adaptive mode configured such that a controller switches a running state of an electric motor assembly according to an identification result of a detector; and a first working mode configured such that the controller makes the first electric motor and the second electric motor jointly driven in response to an input instruction.

An airflow device includes: a housing assembly; an electric motor disposed in the housing assembly; a fan assembly including at least fan blades, where the fan assembly is configured to be driven by the electric motor to generate an airflow; an air suction port configured as an airflow inlet; and an air blowing port configured as an airflow outlet. The airflow device further includes an electrostatic conduction device disposed along the circumferential direction of a fan. The electrostatic conduction device includes a first end configured to be close to one of the fan blades and a second end configured to be close to the air blowing port.

The present invention relates to a manned mower (100) including an operating mechanism (30). The operating mechanism includes a first operating lever (31, 51) and a second operating lever (32, 52). The first operating lever and the second operating lever are operable to control a first drive wheel (411R) and a second drive wheel (411L), respectively. Each of the first operating lever and the second operating lever is provided with a handle portion (311, 511). The operating mechanism further includes a display assembly (33, 53) and an operating assembly (34, 54). The display assembly (33, 53) is at least disposed on the handle portion (311) of the first operating lever (31) and is configured to display at least the operation state of the manned mower. The operating assembly (34, 54) is operated to enable a controller to receive an operation instruction and is at least disposed on the first or second operating lever.

A hedge trimmer includes: a cutting assembly including a first blade and a second blade that reciprocates relative to the first blade along a first direction, where the first blade includes a cutting edge extending along a second direction; a motor configured to drive the cutting assembly; a housing assembly accommodating the motor; and a battery pack detachably coupled to the housing assembly. The hedge trimmer has the state of being placed on a side. When the hedge trimmer is in the state of being placed on the side, the included angle between the second direction and a horizontal plane is greater than or equal to 45 degrees and less than or equal to 90 degrees, and the battery pack is coupled to the housing assembly substantially along the second direction.

An electric wheeled device includes a vehicle frame; a power supply device; a traveling assembly including a first traveling wheel, a second traveling wheel, a first traveling motor and a second traveling motor; an operating assembly generating operation amounts for controlling the traveling assembly, where the operation amounts include a first operation amount used for controlling the first traveling wheel and a second operation amount used for controlling the second traveling wheel; and a traveling control device. The traveling control device obtains a first target rotational speed based on the first operation amount and obtains a second target rotational speed based on the first target rotational speed when the first operation amount is different from the second operation amount; and drives the first traveling motor based on the first target rotational speed and drives the second traveling motor based on the second target rotational speed.

A stand-on lawn mower includes: a cutting assembly including a mowing element and a chassis; a frame; a walking device supporting the frame; a housing device mounted to the frame and including at least an operation console and a front-face housing assembly; and an energy storage device including at least one battery pack. The front-face housing assembly includes: a compartment assembly provided with an accommodation space for accommodating the at least one battery pack and an opening that allows the accommodation space to be open; and a cover plate covering the opening of the compartment assembly. The cover plate has a closed state and an open state, where the opening is closed when the cover plate is in the closed state and the opening is open when the cover plate is in the open state. The stand-on lawn mower is further provided with a left support platform supporting the user to allow the user to pull out or insert the at least one battery pack from a left side and a right support platform supporting the user to allow the user to pull out or insert the at least one battery pack from a right side. The stand-on lawn mower enables the user to conveniently detach or mount the battery pack.

A battery pack includes a housing (10); cells (20) accommodated in the housing, where the cell includes electrodes (21); a bracket (30) accommodated in the housing and supporting the plurality of cells; a first metal plate (61) accommodated in the housing, where the first metal plate is substantially perpendicular to the central axis of the cell, and the first metal plate has openings through which the airflow ejected from the electrodes passes through ; and a second metal plate (62) accommodated in the housing, where the second metal plate is substantially parallel to the first metal plate, and the second metal plate and the first metal plate form an exhaust channel (63a) for guiding the airflow to be discharged out of the housing.

A blowing device includes a main housing with a handle, a mounting portion for mounting a nozzle; an electric motor including a motor body and a motor shaft; a fan discharging air from an air exhaust vent of the nozzle; and a power supply device. The fan is located between an air inlet of the main housing and the motor body in an axial direction of the motor shaft; a maximum rotational speed of the motor shaft is greater than or equal to 120,000 RPM and less than or equal to 300,000 RPM; a circuit board is located between the air exhaust vent and the motor body in the axial direction of the motor shaft; and when the electric motor is driven at the maximum rotational speed, maximum wind pressure of air discharged from the air exhaust vent is greater than or equal to 12 kPa and less than or equal to 230 kPa.

Provided are a power tool and a control method thereof. The power tool includes: a functional element; an electric motor including a stator and a rotor and configured to drive the functional element to rotate; a power supply module configured to supply power to the electric motor; a driver circuit electrically connected to the electric motor and the power supply module and configured to apply a voltage of the power supply module to the electric motor; and a controller electrically connected to the driver circuit and configured to output a control signal to the driver circuit. The controller is configured to, when the electric motor is overloaded, adjust a current limit value supplied to the electric motor and control the driver circuit in a first control mode, so as to cause a voltage of the electric motor to vary in a quasi-sine wave with a rotor position of the electric motor.

Provided is a fastener driver. The fastener driver includes a battery pack; a striking assembly including a striking member configured to strike a fastener; a drive assembly including at least a drive wheel configured to drive the striking member to move along a central axis of the striking member; an electric motor configured to drive the drive wheel to rotate; and a control circuit configured to control the electric motor to operate, start, or stop. A striking frequency of the striking member is greater than 6 fasteners/second.

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A handheld digging tool includes a main body and a first drill rod mechanism with a first function. The main body is configured to be adapted for at least a second drill rod mechanism with a second function. The main body includes: a support mechanism; a drive mechanism supported by the support mechanism, including a direct current motor, and configured to be selectively connected to one of the first drill rod mechanism and the second drill rod mechanism to drive the first drill rod mechanism or the second drill rod mechanism to work; and a battery pack for supplying power to the direct current motor, where the nominal voltage of the battery pack is less than or equal to 80 V, and the maximum output torque of the handheld digging tool is greater than or equal to 80 N·m.

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A manned mower includes a vehicle frame and a support portion used for supporting a user; a traveling wheel set supporting the vehicle frame; a mowing element driven by a mowing electric motor; and a controller configured to apply a drive signal to a driver circuit to control the operation of the mowing electric motor. The controller is configured to receive a first electrical parameter related to the current of the mowing electric motor and when the first electrical parameter satisfies a first preset condition, limit the first electrical parameter within a preset range. When the first electrical' parameter is limited within the preset range, the controller is further configured to selectively use a first method or a second method to determine the rotor position of the mowing electric motor so that the mowing electric motor does not stop when the first electrical parameter is within the preset range.

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