In a rotary electric device for a power working machine capable of being braked by a brake mechanism, a cover having a bottomed cylindrical shape and covering a yoke of the device, includes: a cover cylindrical portion concentrically surrounding an outer peripheral surface of a cylindrical portion of the yoke with an annular clearance therebetween, and having an outer peripheral surface with which a brake shoe is capable of being placed in pressure contact; and a cover bottom wall portion continuous to one end of the cover cylindrical portion, and connected to a bottom wall portion of the yoke. A ventilation clearance communicating with the annular clearance is formed between the bottom wall portion and the cover bottom wall portion. Vent holes communicating the ventilation clearance with an outside of the yoke are provided through the bottom wall portion and the cover bottom wall portion.

In a walk behind mower (10) including a clutch (23) provided in a power transmission path between an electric motor (35) and driven wheels (13), a clutch actuating mechanism (24) interposed between the electric motor and the clutch for selectively engaging the clutch, and a control unit (140) for selectively supplying electric power from a power source to the electric motor according to a command from an operation switch (30), the clutch actuating mechanism includes a cam mechanism for engaging the clutch by using a force transmitted to an input end (23a) of the clutch in the power transmission path when the electric motor is being driven in a normal rotational direction, and the control unit is configured to drive the electric motor in a reverse rotational direction for a prescribed period of time before stopping supplying electric power to the electric motor when a command to stop supplying electric power to the electric motor is received from the operation switch.

In a walk behind mower (10), a clutch actuating mechanism (24) and a dog clutch (23) is included in the power transmission path for the driven wheels (13). The dog clutch includes an input end (23a) provided with teeth (231), an output end (23b) provided with teeth (232) configured to selectively mesh with the teeth of the first clutch half, and a spring member (26) interposed between the first clutch half and the second clutch half to normally urge the two clutch halves away from each other. The clutch actuating mechanism is configured to displace the two clutch halves toward each other against a biasing force of the spring member by using a drive force transmitted from the power source to the clutch actuating mechanism.

A transmission for a walk-behind wheeled vehicle, the transmission being of the type including at least one casing (2) housing a driver member (3), equipped with rotary drive motor means (4), a rotary driven member (5), two wheel drive shafts (6A, 6B) in alignment, two clutch mechanisms (8) each of which is disposed between the driven member (5) and a wheel drive shaft (6A; 6B), each clutch mechanism (8) being activated by the driven member (5) being driven in rotation forwards, and deactivatable by the wheel drive shaft (6A; 6B) with which it co-operates being driven in rotation forwards, when the speed of rotation of the wheel drive shaft (6A, 6B) is greater than the speed of rotation of the driven member (5). The rotary drive motor means (4) for driving the driver member (3) in rotation are motor means that can be controlled to rotate in two directions of rotation, and each clutch mechanism (8) is of the type that is deactivatable merely by the driven member (5) being driven in rotation in the backwards direction.

A compact clutch including a driven shaft on which the following are mounted: a gear wheel; a driving bush; a driven bush; a coil spring; a first collar with cam surfaces; and a second collar with cam surfaces. The gear wheel and the bushes are arranged axially next to each other; the gear wheel and the driving bush are constrained together in the circumferential direction; the spring surrounds externally the bushes; the first collar surrounds externally the spring; and the second collar surrounds externally the first collar. The gear wheel and the bushes are constrained to the driven shaft in the axial direction by means of two stop rings; and the driven bush is constrained to the driven shaft in the circumferential direction by means of at least one tongue.

A riding lawn care vehicle may include a frame to which at least a first drive wheel and a second drive wheel of the riding lawn care vehicle are attachable, an engine operably coupled to the frame and the first and second drive wheels to provide power to the first and second drive wheels, a steering assembly that includes a first steering lever and a second steering lever, and a work assembly. The first and second steering levers are operably coupled to the first and second drive wheels respectively to facilitate turning of the riding lawn care vehicle based on drive speed control of the first and second drive wheels responsive to positioning of the first and second steering levers. The work assembly is operably coupled to the engine to perform a work function responsive to power received from the engine. Each of the first and second steering levers includes a grip portion. At least one of the first steering lever or the second steering lever includes a control module disposed proximate to and separate from the grip portion. The control module includes a control operator configured to control operation of the engine or the work assembly.

A utility machine, such as an outdoor power equipment unit such as a lawn mower, includes a work unit performing work in addition to motive power for the utility machine and a trailer occupied by an operator in a standing position. The operator may seamlessly step onto the trailer to operate the machine in stand-on mode and step off the trailer to operate the machine in walk-behind mode. The trailer remains in the deployed condition in both stand-on mode and walk-behind mode.

A riding lawn mower includes a power output assembly including a mowing element, a cutting motor for driving the mowing element to move, and a cutting control module for controlling the cutting motor; a walking assembly including a walking wheel, a walking motor for driving the walking wheel to travel, and a walking control module for controlling the walking motor; and a first operating component configured to set starting modes of the walking motor. The first operating component has a first operating state configured to start the walking motor in a first starting mode, and a second operating state configured to start the walking motor in a second starting mode. In the first starting mode, the walking motor starts at a first starting acceleration. In the second starting mode, the walking motor starts at a second starting acceleration. The second starting acceleration is greater than the first starting acceleration.

Transmission gear box (1) comprising, at least partially accommodated in the housing (1), an output shaft (6), a rotating drive member (5) mounted to rotate freely about the shaft (6), a system (2) for rotating the rotating drive member (5) in forward and reverse gear and, arranged between the shaft (6) and the rotating drive member (5), a clutch mechanism (3) having an engaged state and a disengaged state, wherein the shaft (6) is free to rotate in any of the directions of rotation thereof, the automatic clutch mechanism (3) being configured, in forward gear, to shift from the disengaged state to the engaged state by rotating in forward gear the motor member (5) when the speed of rotation of the rotating drive member (5) is higher than that of the shaft (6), and from the engaged state to the disengaged state by rotating in forward gear the shaft (6) when the speed of rotation of the shaft (6) is higher than the speed of rotation of the rotating drive member (5). The clutch mechanism (3, 4) is also automatic in reverse gear.

The present disclosure includes: a cutting blade; an electric motor (5) that rotationally drives the cutting blade; a main power source (6) that supplies electric power to the electric motor (5); a clutch that engages and disengages motive power between the electric motor (5) and the cutting blade; an inclination sensor (31) that detects an inclination of the machine body; and a controller (30) for controlling power on and off of the main power source (6). When a direction orthogonal to a travelling direction of the machine body is defined as the horizontal direction, and a center line in a vertical direction of the machine body when the machine body on a horizontal plane is viewed from a front side is defined as a reference line, the controller (30) turns off the main power source when the reference line is inclined at a prescribed angle or more with respect to the horizontal direction or when rotation of the electric motor (5) is stopped for a prescribed time period or more.