A motor assembly having a brake device and a downsized cooling system is provided. The motor assembly comprises a drive motor, a brake device that stops rotation of a motor shaft, and a casing that holds the drive motor and the brake device. The motor assembly further comprises a hollow passage formed in the motor shaft to allow cooling medium to flow therethrough, a centrifugal passage formed in the brake rotor from the hollow passage to an opening of the brake rotor, and a return passage that returns the cooling medium discharged from the opening to the hollow passage.

A motor assembly having a brake device and a downsized cooling system is provided. The motor assembly comprises a drive motor, a brake device that stops rotation of a motor shaft, and a casing that holds the drive motor and the brake device. The motor assembly further comprises a hollow passage formed in the motor shaft to allow cooling medium to flow therethrough, a centrifugal passage formed in the brake rotor from the hollow passage to an opening of the brake rotor, and a return passage that returns the cooling medium discharged from the opening to the hollow passage.

The invention relates to a braking mechanism (10) for an electric drive motor (1), in particular a drive motor (2) comprising an armature shaft (5) that protrudes from a motor housing (2); the braking mechanism (10) comprises at least one braking element (17) and an energy store, the energy store permanently applying a braking power to a frictional surface of the braking element. The braking mechanism (10) is characterized in that the energy store and the braking element (17) are made of the same material as a single piece.

The invention relates to a braking mechanism (10) for an electric drive motor (1), in particular a drive motor (2) comprising an armature shaft (5) that protrudes from a motor housing (2); the braking mechanism (10) comprises at least one braking element (17) and an energy store, the energy store permanently applying a braking power to a frictional surface of the braking element. The braking mechanism (10) is characterized in that the energy store and the braking element (17) are made of the same material as a single piece.

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 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.

A vehicle wheel assembly comprises a wheel for mounting a tire thereon and having an inner space; and an in-wheel motor mounted in the inner space of the wheel and comprising: a rotor connected to the wheel and configured to rotatable relative to a stator, the stator configured to drive the rotor, an electronic device comprising a circuit board and electronics mounted on the circuit board and configured to control the in-wheel motor, two-phase dielectric material, and covers coupled with the stator to form a hermetic enclosure. The electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by the wall of the stator and the covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device to cool the stator and the electronic device by transitioning between a liquid phase and a gaseous phase, conduction, and convection.

A vehicle wheel assembly comprises a wheel for mounting a tire thereon and having an inner space; and an in-wheel motor mounted in the inner space of the wheel and comprising: a rotor connected to the wheel and configured to rotatable relative to a stator, the stator configured to drive the rotor, an electronic device comprising a circuit board and electronics mounted on the circuit board and configured to control the in-wheel motor, two-phase dielectric material, and covers coupled with the stator to form a hermetic enclosure. The electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by the wall of the stator and the covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device to cool the stator and the electronic device by transitioning between a liquid phase and a gaseous phase, conduction, and convection.

Linear actuator comprising an electric motor (6), which through a transmission (12) drives a spindle unit comprising at least one spindle (10) with a spindle nut (13). A tubular adjustment element (3) in connection with the spindle unit is displaced either outwards or inwards depending on the direction of rotation of the spindle unit. A brake in the shape of a coil spring (21) is arranged in connection with a cylindrical element (15) for retaining the tubular adjustment element (3) in a given position when the power for the electric motor (6) is cut off. The cylindrical element (15) is designed as a separate cylindrical element arranged on the spindle (10) or a shaft in the transmission (12). The separate cylindrical element (15) is preferably arranged on a rear end of the spindle (10) between the rear mounting (4) and the bearing (11) for the spindle (10). Compared to the known constructions, where the spring is positioned on a cylindrical element on the side of a worm wheel, the heat generation is limited, just as the heat is led out to the rear mounting.

Linear actuator comprising an electric motor (6), which through a transmission (12) drives a spindle unit comprising at least one spindle (10) with a spindle nut (13). A tubular adjustment element (3) in connection with the spindle unit is displaced either outwards or inwards depending on the direction of rotation of the spindle unit. A brake in the shape of a coil spring (21) is arranged in connection with a cylindrical element (15) for retaining the tubular adjustment element (3) in a given position when the power for the electric motor (6) is cut off. The cylindrical element (15) is designed as a separate cylindrical element arranged on the spindle (10) or a shaft in the transmission (12). The separate cylindrical element (15) is preferably arranged on a rear end of the spindle (10) between the rear mounting (4) and the bearing (11) for the spindle (10). Compared to the known constructions, where the spring is positioned on a cylindrical element on the side of a worm wheel, the heat generation is limited, just as the heat is led out to the rear mounting.