An unbalanced shaft is provided that has a center of mass eccentric to its rotational axis to generate a shaft unbalance. The unbalanced shaft includes a bearing journal having a variable width throughout its circumference, and a multi-row cage having rollers which roll on inner raceways arranged on an outer lateral surface of the bearing journal. The rollers and inner raceways define a load zone, within which a width of each of the inner raceways is greater than an effective length of the rollers idling thereon. At least one of the inner raceways, which extends circumferentially for 360 degrees, has a width throughout that is greater than an effective length of the rollers rolling thereon. For sections outside of the load zone, at least one of the inner raceways has a width less than the effective length of the rollers that roll thereon.

An unbalanced shaft is provided that has a center of mass eccentric to its rotational axis to generate a shaft unbalance. The unbalanced shaft includes a bearing journal having a variable width throughout its circumference, and a multi-row cage having rollers which roll on inner raceways arranged on an outer lateral surface of the bearing journal. The rollers and inner raceways define a load zone, within which a width of each of the inner raceways is greater than an effective length of the rollers idling thereon. At least one of the inner raceways, which extends circumferentially for 360 degrees, has a width throughout that is greater than an effective length of the rollers rolling thereon. For sections outside of the load zone, at least one of the inner raceways has a width less than the effective length of the rollers that roll thereon.

A generator (100) and/or machine (110) generating mechanical energy and functioning on the principle of exploitation of an energy allowing the existence of centrifugal forces (Fc) on masses (120) being displaced in rotation, into an effective elliptic trajectory (150), about a respective shaft (128) freely rotatably mounted on a plate (122) itself freely rotatably mounted on a main shaft (202) freely rotatably mounted on a fixed chassis (140). The centrifugal forces generated by the masses (120) transmit a rotational oscillating movement of the plate (122) transferred by a mechanical energy transmission mechanism into a continuous rotation movement to an output torque mechanism freely mounted on the main shaft (202).

A reciprocating impact part non-concentric protruding shaft fixed bearing method, comprising: arranging an eccentric shaft section (12) and a power shaft section (11), arranging eccentric shaft section (12) bearings (8) on the section (12), arranging power shaft section bearings (5) on the section (11); arranging power shaft section bearing retaining rings (10) and eccentric shaft section bearing retaining rings (9) to block the bearings (5) and (8), respectively; arranging connecting rods (2) as separate snap-fitted crankshaft connecting rods or integrated sleeved crankshaft connecting rods, fitting the latter onto the bearing (8) arranging a base (1) arranging the bearings (5) thereon, such that they support the sections (11) and (12) arranging a power source component (3), such that it drives the section (11) to rotate and the section (11) drives the rods in reciprocating impact. Also provided is a non-concentric protruding shaft fixed bearing reciprocating impact part for implementing the method.

A reciprocating impact part non-concentric protruding shaft fixed bearing method, comprising: arranging an eccentric shaft section (12) and a power shaft section (11), arranging eccentric shaft section (12) bearings (8) on the section (12), arranging power shaft section bearings (5) on the section (11); arranging power shaft section bearing retaining rings (10) and eccentric shaft section bearing retaining rings (9) to block the bearings (5) and (8), respectively; arranging connecting rods (2) as separate snap-fitted crankshaft connecting rods or integrated sleeved crankshaft connecting rods, fitting the latter onto the bearing (8) arranging a base (1) arranging the bearings (5) thereon, such that they support the sections (11) and (12) arranging a power source component (3), such that it drives the section (11) to rotate and the section (11) drives the rods in reciprocating impact. Also provided is a non-concentric protruding shaft fixed bearing reciprocating impact part for implementing the method.

A gear train is contained within the housing of an actuator, is coupled to a movable component outside the housing, and includes a first gear and a second gear. A bend shaft is fixed to an internal surface of the housing and supports the first and second gears. The bend shaft includes a lower portion, a crosspiece, and an upper portion. The lower portion has a first end coupled to the housing and a second end offset from the first end, and extends from the first end to the second end along a first direction. The crosspiece is oriented orthogonal to the first direction and extends from the second end of the lower portion. The upper portion has a third end coupled to the crosspiece and a fourth end offset from the third end, and extends from the third end to the fourth end along the first direction.

A drive system as disclosed includes an input shaft, an output shaft, and at least two coupling elements respectively coupled to the input shaft and the output shaft. In order to absorb assembly and manufacturing tolerances with respect to the shafts, the coupling elements and their attachment to the shafts and thereby prevent jamming of the drive system, at least one coupling element has an elastically deformable section, the elastically deformable section having a different material or a different cross-section than an adjacent section of the coupling element.

A drive system as disclosed includes an input shaft, an output shaft, and at least two coupling elements respectively coupled to the input shaft and the output shaft. In order to absorb assembly and manufacturing tolerances with respect to the shafts, the coupling elements and their attachment to the shafts and thereby prevent jamming of the drive system, at least one coupling element has an elastically deformable section, the elastically deformable section having a different material or a different cross-section than an adjacent section of the coupling element.

An automatic toothbrush (100), including: a body (102) having opposed ends, a cavity (105) situated between the opposed ends, and an opening (107) situated at one of the opposed ends; an output shaft (120) having first and second ends (124, 122) and extending through the opening such that the second end (122) is outside of the cavity, the output shaft having a plurality of bends (139, 141, 143,145) situated between the second end and the opening; and an oral cleaning tool (104) configured to be press fit onto that portion of the shaft which has the plurality of bends.

An automatic toothbrush (100), including: a body (102) having opposed ends, a cavity (105) situated between the opposed ends, and an opening (107) situated at one of the opposed ends; an output shaft (120) having first and second ends (124, 122) and extending through the opening such that the second end (122) is outside of the cavity, the output shaft having a plurality of bends (139, 141, 143,145) situated between the second end and the opening; and an oral cleaning tool (104) configured to be press fit onto that portion of the shaft which has the plurality of bends.