Abstract: A speed-reducer-and-motor all-on-one machine is disclosed and includes a connection shaft, a motor and a speed reducer. The connection shaft includes a first section, a second section and an accommodation space. The first section and the second section are arranged in an axial direction. The accommodation space is in communication between a front end and a rear end of the connection shaft. An elliptical cam is formed on an outer surface of the second section of the connection shaft. An outer diameter of the first section is greater than a major axis length of the elliptical cam. The motor is received within the accommodation space and connected to an inner surface of the first section. The speed reducer is connected to the outer surface of the second section.

Abstract: A power module of an electric assisted bicycle is disclosed and includes a pedal shaft, a gear-plate-output shaft, a reducer, a motor, a first sensor, a housing, a second sensor and a driving controller. The gear-plate-output, a reducer-output shaft and a reducer-fixed shaft of the reducer are disposed in parallel and sleeved on the pedal shaft concentrically. The motor drives the gear-plate-output shaft to rotate. The first sensor is disposed on the reducer-fixed shaft for sensing a first torque of the reducer-output shaft acting on the reducer-fixed shaft. The reducer-fixed shaft is connected to the housing. A frameset-fastening component protrudes outwardly from the housing, and is configured to fix the power module on the frameset. The second sensor is disposed on the frameset-fastening component for sensing a second torque of the power module acting on the frameset. The driving controller controls the motor in accordance with the second torque and the first torque.

Abstract: A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.

Abstract: A power module of an electric assisted bicycle is disclosed and includes a pedal shaft, a gear-plate-output shaft, a reducer-output shaft and a motor-output shaft. The pedal shaft is arranged along an axial direction. The gear-plate-output shaft includes a first section and a second section arranged in the axial direction. The first section is concentrically sleeved on the pedal shaft through a first one-way bearing along a radial direction. When the pedal shaft is forced to rotate, the gear-plate-output shaft is driven through the first one-way bearing. The reducer-output shaft is concentrically sleeved on an outer surface of the second section through a second one-way bearing along the radial direction. The motor-output shaft is concentrically sleeved on the reducer-output shaft along the radial direction. When the motor-output shaft drives the reducer-output shaft to rotate, the gear-plate-output shaft is driven by the reducer-output shaft through the second one-way bearing.

Abstract: A speed reducer includes an input shaft, an input gear, a fixing gear and an output gear. The input shaft includes an eccentric structure. The input gear is disposed on the eccentric structure and includes first teeth of which each with a first contact portion and a second contact portion. The fixing gear and the output gear are disposed corresponding to the input gear, wherein the fixing gear includes second teeth, and the second teeth are in contact with the first contact portions, wherein the output gear includes third teeth, and the third teeth are in contact with the second contact portions. A first tooth number difference between the first teeth and the second teeth is different from a second tooth number difference between the first teeth and the third teeth.

Abstract: A rotary machine device configured to contact with an external object is provided. The rotary machine device includes a rotary motor, a first encoder, a fixed housing, a fixed shaft, an output shaft and a second encoder. The rotary motor includes a motor housing and an exerting shaft. As the rotor of the motor housing rotates for a rotation angle, the rotor drives the exerting shaft to rotate for an exerting angle. The first encoder detects the rotation angle of the rotor. The output shaft includes an elastomer and is inserted in an accommodation hole of the fixed shaft. The elastomer is penetrated through the output shaft and is connected to the exerting shaft. The second encoder includes a disk and a sensor disposed on the exerting shaft and the fixed shaft respectively. The sensor detects the exerting angle of the exerting shaft through the disk.

Abstract: A speed reducer comprises a transmission shaft, an eccentric wheel, a first wheel assembly, a rotating wheel and a second wheel assembly. The first wheel assembly comprises a first wheel disc and at least one first roller. The at least one first roller is disposed on the inner wall of first wheel disc. The rotating wheel comprises a main body comprising an outer ring structure and a concave structure. The outer ring structure comprises at least one first tooth. The at least one first tooth is in contact with the corresponding first roller. At least one second roller is disposed within the concave structure. The second wheel assembly comprises a second wheel disc and at least one second tooth. The at least one second tooth is disposed on an outer periphery of the second wheel assembly. The at least one second tooth is in contact with the corresponding second roller.

Abstract: A cycloid speed reducer includes an input shaft, a rolling assembly, first and second cycloid discs, a crankshaft and an output disc. The first and second cycloid discs are disposed around the input shaft and driven by the input shaft. The first and second cycloid discs are located at two opposite sides of the rolling assembly, respectively. The crankshaft includes first and second eccentric ends and first and second concentric ends integrally formed as a one-piece structure and arranged sequentially. The first and second eccentric ends are linked with the first and second cycloid discs respectively. An eccentricity value is between any neighboring two of the concentric and eccentric ends. The diameters of all the concentric and eccentric ends are equal. The output disc is linked with the first or second concentric end. The output disc is a power output end of the cycloid speed reducer.

Abstract: A cycloid speed reducer includes an input shaft, a rolling assembly, a first cycloid disc, a second cycloid disc, a first crankshaft, a second crankshaft, a first output disc and a second output disc. The first cycloid disc and the second cycloid disc are disposed around the input shaft and rotated with the input shaft. The first cycloid disc and the second cycloid disc are located at two opposite sides of the rolling assembly, respectively. The first crankshaft includes a first concentric end and a first eccentric end. The first eccentric end is linked with the first cycloid disc. The second crankshaft includes a second concentric end and a second eccentric end. The second eccentric end is linked with the second cycloid disc. The first output disc is linked with the first concentric end. The second output disc is linked with the second concentric end.

Abstract: The present disclosure provides a work equipment system and a control method therefor. The work equipment system includes a work equipment, a temperature sensor and a controller. The work equipment includes a motor device, and the motor device is configured to provide a motive power to a load device. The temperature sensor is configured to measure a motor temperature. The controller is configured to: calculate a first current based on a required motive power command and electrical parameters; calculate a temperature difference between the motor temperature and a preset temperature; calculate a thermal power based on the temperature difference and a thermal resistance; calculate a second current based on the thermal power and the motor resistance; and compare the second current to an effective value of the first current for determining whether the second current is smaller than the first current.

Abstract: A cycloid speed reducer includes a weight element, an input shaft and a cycloid disc. The weight element is disposed within an accommodation space of the cycloid disc. An eccentric part is disposed on the input shaft. Since the length of the input shaft is reduced, the overall length of the cycloid speed reducer is shortened. Moreover, the mass center of the weight element and the mass center of the eccentric part and the cycloid disc are arranged along the same axial direction. That is, the line passing through the mass center of the weight element and the mass center of the eccentric part and the cycloid disc is perpendicular to the input shaft. Consequently, the efficacy of the dynamic balance of the cycloid speed reducer is enhanced.

Abstract: A rotary machine device configured to contact with an external object is provided. The rotary machine device includes a rotary motor, a first encoder, a fixed housing, a fixed shaft, an output shaft and a second encoder. The rotary motor includes a motor housing and an exerting shaft. As the rotor of the motor housing rotates for a rotation angle, the rotor drives the exerting shaft to rotate for an exerting angle. The first encoder detects the rotation angle of the rotor. The output shaft includes an elastomer and is inserted in an accommodation hole of the fixed shaft. The elastomer is penetrated through the output shaft and is connected to the exerting shaft. The second encoder includes a disk and a sensor disposed on the exerting shaft and the fixed shaft respectively. The sensor detects the exerting angle of the exerting shaft through the disk.

Abstract: A speed reducing device includes a motor and a speed reducing mechanism. The speed reducing mechanism includes at least one roller assembly, a cycloid disc, at least one fixing disc and a positioning assembly. The roller assembly is disposed within a rotor portion of the motor. While the roller assembly is rotated with the rotor portion, the roller assembly is eccentrically revolved. The roller assembly includes a wheel disc and at least one roller. The cycloid disc includes a main body and at least one cycloid tooth structure. The cycloid tooth structure is protruded from an outer periphery of the main body and in contact with the corresponding roller. While the roller assembly is eccentrically revolved, the at least one cycloid tooth structure is pushed against the corresponding roller, so that the cycloid disc is correspondingly rotated.

Abstract: A cycloid speed reducer includes an input shaft, a rolling assembly, a first cycloid disc, a second cycloid disc, a first crankshaft, a second crankshaft, a first output disc and a second output disc. The first cycloid disc and the second cycloid disc are disposed around the input shaft and rotated with the input shaft. The first cycloid disc and the second cycloid disc are located at two opposite sides of the rolling assembly, respectively. The first crankshaft includes a first concentric end and a first eccentric end. The first eccentric end is linked with the first cycloid disc. The second crankshaft includes a second concentric end and a second eccentric end. The second eccentric end is linked with the second cycloid disc. The first output disc is linked with the first concentric end. The second output disc is linked with the second concentric end.

Abstract: A bearing assembly and a rotary shaft apparatus employing the same are provided. The bearing assembly is rotatably coupled with a first shaft and a second shaft. The first bearing housing includes a first annular recess having a first axial depth. The first bearing is connected with the first annular recess and the first shaft and has a first axial thickness. The second bearing housing includes a second annular recess having a second axial depth. The second bearing is connected with the first annular recess, the second annular recess and the second shaft and has a second axial thickness. The spacer is disposed between the first bearing and the second bearing and has a third axial thickness. The sum of the first axial thickness, the second axial thickness and the third axial thickness is greater than the sum of the first axial depth and the second axial depth.

Abstract: A two-stage cycloid speed reducer comprises two rotating disc assemblies. Each rotating disc assembly comprises two cycloid discs. In other words, the cycloid speed reducer has four cycloid discs to be in contact with the corresponding rollers. Consequently, the load withstood by each cycloid disc is reduced. Since the cycloid speed reducer has stronger structural strength, the cycloid speed reducer can be applied to the high-load circumstance. Moreover, an eccentric assembly of the eccentric device includes a plurality of eccentric cylinders. The eccentric cylinders are disposed within the axle holes of the corresponding cycloid discs. Due to the eccentric cylinders, the eccentric direction of two cycloid discs is opposite to the eccentric direction of the other two cycloid discs. Consequently, it is not necessary to install an additional weight compensation device in the cycloid speed reducer to compensate the dynamic equilibrium. Moreover, the cycloid speed reducer can be assembled easily.

Abstract: A linear-rotary actuator includes a base, a first linear motor, a second linear motor, a linear rail, and a ball screw. The first and second linear motors are disposed on the base and respectively have a coil assembly and a magnet backplane. The linear rail is located on the base. The ball screw includes a screw and a nut, wherein the screw is connected to the first linear motor, and the nut is connected to the second linear motor. When the screw and the nut are driven by the first and second linear motors to move along the linear rail in a synchronized manner, the linear-rotary actuator provides linear motion output. When the nut is driven by the second linear motor to move along the linear rail in an asynchronous manner with respect to the screw, the linear-rotary actuator provides rotary motion output.

Abstract: An actuator is provided, including a fixed assembly and a movable assembly. The fixed assembly includes a coil module, a base, a first screwing member, and a linear rail. The first screwing member passes through the base and the linear rail, and the linear rail is positioned on the base. The movable assembly includes a U-shaped back board having an inner space, a first magnetic module, a second magnetic module aligned with the first magnetic module, and a sliding block. The first and second magnetic modules are disposed on the U-shaped back board and accommodated in the inner space. The coil module is disposed between the first magnetic module and the second magnetic module. The sliding block is positioned on the U-shaped back board in the inner space, and slidably connected to the linear rail.

Abstract: The present disclosure provides a work equipment system and a control method therefor. The work equipment system includes a work equipment, a temperature sensor and a controller. The work equipment includes a motor device, and the motor device is configured to provide a motive power to a load device. The temperature sensor is configured to measure a motor temperature. The controller is configured to: calculate a first current based on a required motive power command and electrical parameters; calculate a temperature difference between the motor temperature and a preset temperature; calculate a thermal power based on the temperature difference and a thermal resistance; calculate a second current based on the thermal power and the motor resistance; and compare the second current to an effective value of the first current for determining whether the second current is smaller than the first current.

Abstract: A bearing assembly and a rotary shaft apparatus employing the same are provided. The bearing assembly is rotatably coupled with a first shaft and a second shaft. The first bearing housing includes a first annular recess having a first axial depth. The first bearing is connected with the first annular recess and the first shaft and has a first axial thickness. The second bearing housing includes a second annular recess having a second axial depth. The second bearing is connected with the first annular recess, the second annular recess and the second shaft and has a second axial thickness. The spacer is disposed between the first bearing and the second bearing and has a third axial thickness. The sum of the first axial thickness, the second axial thickness and the third axial thickness is greater than the sum of the first axial depth and the second axial depth.