A drive-side rotor is rotated synchronously with a crankshaft. A driven-side rotor is rotated integrally with a camshaft. An internal gear section is formed at the driven-side rotor. An Oldham coupling includes: a driven Oldham flange that is formed at the drive-side rotor; a drive Oldham flange that is formed at the planetary rotor; and an Oldham intermediate that is configured to synchronize rotation of the driven Oldham flange and rotation of the drive Oldham flange while permitting eccentricity between the driven Oldham flange and the drive Oldham flange. There is satisfied a relationship of θ2<θ1 where: θ1 is a maximum tilt amount of the planetary rotor relative to the driven Oldham flange; and θ2 is a maximum tilt amount of the planetary rotor in a clearance formed at the Oldham coupling.

A multistage pericyclic gear reducer includes an input shaft, an input external-teeth gear coaxially coupled to and rotatable with the input shaft, a first middle planet ring gear coupled between a first driver ring gear and a first driven wheel. The first driver ring gear meshed with the input external-teeth gear. The multistage pericyclic gear reducer further includes a second middle planet ring gear coupled between the first driven wheel and a second driven wheel, an output external-teeth gear extended through and meshed with both the first middle planet ring gear and the second middle planet ring gear, and a central output shaft coupled to the output external-teeth gear.

A spacer includes a first surface and a second surface. The first surface and the second surface respectively have two opposite first roller accommodating grooves and two opposite second roller accommodating grooves. The first and second roller accommodating grooves of the first surface correspond to the second and first roller accommodating grooves of the second surface. The spacer defines a reference plane, which is perpendicular to a horizontal direction and passes through a center point of the maximum thickness of the spacer. The horizontal distance from the reference plane to the center of each first roller accommodating groove is different from the horizontal distance from the reference plane to the center of each second roller accommodating groove. By flipping the spacer of the present invention, the spacing of two adjacent rollers can be adjusted. In addition, the present invention further provides a cycloidal reducer with the aforementioned spacer.

A speed reducer includes a helical gear, an eccentric shaft and a slider plate. The speed reducer also includes a transmission gear and an output gear body. The transmission gear is supported at a first support part, transmission gear spinning is restricted by engagement with the slider plate, and the transmission gear revolves by the helical gear rotating with the eccentric shaft. The output gear body rotates by the transmission gear revolving. The transmission gear includes a pair of restricting protrusions protruding toward the slider plate side. The restricting protrusions have engaging surfaces that touch the slider plate wherein the engaging surfaces oppose the slider plate in a radial direction of the transmission gear. Surfaces at opposite sides of the restricting protrusions from the slider plate are formed, as seen in the axis direction of the transmission gear, to be convex to the opposite sides thereof from the slider plate.

A pericyclic gear reducer may include a middle planet ring gear coupled between a driver ring gear and a driven wheel utilizing a first prismatic joint on a first side of the middle planet ring gear and a second prismatic joint on a second side of the middle planet ring gear. The pericyclic gear reducer may further include an input shaft rotatably coupled to the driver ring gear and the driver ring gear configured to transfer the rotational movement of the input shaft to the middle planet ring gear. The pericyclic gear reducer may further include an output sun gear coupled to the middle planet ring gear. The output sun gear further rotatably coupled to a central output shaft.

A reduction gear may have a housing, a first gear stage and a second gear stage. The second gear stage may have an externally toothed first gear wheel and an internally toothed second gear wheel which meshes with the first gear wheel and is at least indirectly rotationally fixed to an output. The reduction gear may also have a circumferential eccentric, which is driven by the first gear stage, for driving a rolling motion from the second gear wheel to the first gear wheel. A torque support disc is guided in a linearly movable manner in a first direction along two sliding surfaces of the bearing point. A rib bears against the torque support disc and elastically pretensions the torque support disc in the direction of a further sliding surface of the bearing point. A gear motor having an electric motor may use the reduction gear.

A track system includes a track member with an elongate shaft mounted thereto. At least one support mechanism is mounted to the track member. The at least one support mechanism includes a housing. An engagement feature includes first and second engagement members spaced-apart from one another to define a receiving area therebetween. The first and second engagement members are operable between deployed and retracted positions relative to the housing. The elongate shaft is received in the receiving area when the first and second engagement members are in the deployed position.

A phase adjustment mechanism for setting a relative rotational phase of a driven-side rotational body to a drive-side rotational body of a valve opening-closing timing control device includes a output gear around a rotational axis, an input gear being rotated around an eccentric axis, and an eccentric member. The eccentric member includes an outer peripheral surface with a first arc portion, a second arc portion, a plate spring fitted between the first arc portion and the second arc portion, and a spaced portion. Each of the first arc portion and the second arc portion is disposed from a position less than 90 degrees to a position more than 90 degrees as a central angle with respect to the eccentric axis from a biasing direction of the plate spring in the peripheral direction.

A cycloidal reducer includes a housing, an input bushing mounted in the housing for input of a rotational force, and two speed-reduced output units, each of which includes a cycloidal disc, an output member, a cross Oldham coupling member, and a plurality of rolling elements. The cycloidal disc is mounted to the input bushing and has troughs formed in an end face thereof and each having a sidewall forming an inclined surface. The output member has troughs formed in an end face thereof. The cross Oldham coupling member has coupling sections, each having a sidewall forming an inclined surface. The coupling sections are respectively received in the troughs of the cycloidal disc and the output member. The rolling elements are arranged between the inclined surfaces of the cycloidal disc and the cross Oldham coupling member and between the sidewalls of the output member and the cross Oldham coupling member.

A cycloidal reducer includes a housing, an input bushing mounted in the housing for input of a rotational force, and two speed-reduced output units, each of which includes a cycloidal disc, an output member, a cross Oldham coupling member, and a plurality of rolling elements. The cycloidal disc is mounted to the input bushing and has troughs formed in an end face thereof and each having a sidewall forming an inclined surface. The output member has troughs formed in an end face thereof. The cross Oldham coupling member has coupling sections, each having a sidewall forming an inclined surface. The coupling sections are respectively received in the troughs of the cycloidal disc and the output member. The rolling elements are arranged between the inclined surfaces of the cycloidal disc and the cross Oldham coupling member and between the sidewalls of the output member and the cross Oldham coupling member.