A speed reducer includes an outer tubular member, internal tooth pins, oscillating gears and a carrier block. The outer tubular member has pin grooves on an inner circumferential surface thereof. The internal tooth pins are rotatably placed in the pin grooves. The oscillating gears have external teeth smaller in number than the pin grooves, and the oscillating gears are oscillatorily rotatable with the external teeth engaging with the internal tooth pins. The carrier block is cooperatively connected to the oscillating gears such that the oscillating gears are allowed to oscillatorily rotate relative to the carrier block and restricted from rotating on own axis relative to the carrier block. A displacement restricting member configured to restrict the internal tooth pins from being displaced inwardly in a radial direction of the outer tubular member is disposed between the outer peripheries of the oscillating gears adjacent to each other.

A speed reducer includes an outer tubular member, internal tooth pins, oscillating gears and a carrier block. The outer tubular member has pin grooves on an inner circumferential surface thereof. The internal tooth pins are rotatably placed in the pin grooves. The oscillating gears have external teeth smaller in number than the pin grooves, and the oscillating gears are oscillatorily rotatable with the external teeth engaging with the internal tooth pins. The carrier block is cooperatively connected to the oscillating gears such that the oscillating gears are allowed to oscillatorily rotate relative to the carrier block and restricted from rotating on own axis relative to the carrier block. A displacement restricting member configured to restrict the internal tooth pins from being displaced inwardly in a radial direction of the outer tubular member is disposed between the outer peripheries of the oscillating gears adjacent to each other.

A transmission system includes planetary gearing with a ring gear, a plurality of planet gears, a carrier, and a sun gear, a forward clutch operatively connected between the ring gear and carrier, a reverse brake operatively connected between the carrier and a rotationally fixed location, and a control subsystem to switch the transmission system between forward and reverse operational modes in the which the ring gear and the sun gear rotate in the same or opposite rotational directions, respectively. A control subsystem actuation stroke can actuate both the forward clutch and the reverse brake based on a common control signal.

A transmission system includes planetary gearing with a ring gear, a plurality of planet gears, a carrier, and a sun gear, a forward clutch operatively connected between the ring gear and carrier, a reverse brake operatively connected between the carrier and a rotationally fixed location, and a control subsystem to switch the transmission system between forward and reverse operational modes in the which the ring gear and the sun gear rotate in the same or opposite rotational directions, respectively. A control subsystem actuation stroke can actuate both the forward clutch and the reverse brake based on a common control signal.

A rotary machine employing a heterodyne transmission includes: a central axle; a planetary gear set comprising a sun gear journaling the central axle and a plurality of planet gears surrounding and intermeshed with the sun gear; and a plurality of rotating clusters, each of the rotating clusters comprising a rotating central body and a plurality of rotating eccentric bodies surrounding and intermeshed with the rotating central body, wherein the rotating central body is coupled to a respective one of the planet gears, and wherein each of the rotating eccentric bodies has a center of mass off-axis with respect to its axis of rotation.

A rotary machine employing a heterodyne transmission includes: a central axle; a planetary gear set comprising a sun gear journaling the central axle and a plurality of planet gears surrounding and intermeshed with the sun gear; and a plurality of rotating clusters, each of the rotating clusters comprising a rotating central body and a plurality of rotating eccentric bodies surrounding and intermeshed with the rotating central body, wherein the rotating central body is coupled to a respective one of the planet gears, and wherein each of the rotating eccentric bodies has a center of mass off-axis with respect to its axis of rotation.

In accordance with embodiments of this disclosure, a rotary machine employing a heterodyne transmission comprises: a central axle; a planetary gear set comprising a sun gear journaling the central axle and a plurality of planet gears surrounding and intermeshed with the sun gear; and a plurality of rotating clusters, each of the rotating clusters comprising a rotating central body and a plurality of rotating eccentric bodies surrounding and intermeshed with the rotating central body, wherein the rotating central body is coupled to a respective one of the planet gears, and wherein each of the rotating eccentric bodies has a center of mass off-axis with respect to its axis of rotation.

In accordance with embodiments of this disclosure, a rotary machine employing a heterodyne transmission comprises: a central axle; a planetary gear set comprising a sun gear journaling the central axle and a plurality of planet gears surrounding and intermeshed with the sun gear; and a plurality of rotating clusters, each of the rotating clusters comprising a rotating central body and a plurality of rotating eccentric bodies surrounding and intermeshed with the rotating central body, wherein the rotating central body is coupled to a respective one of the planet gears, and wherein each of the rotating eccentric bodies has a center of mass off-axis with respect to its axis of rotation.

A transmission between a drive shaft and a driven shaft comprises a housing and at least a driven gearwheel that is mounted on the driven shaft and a drive gearwheel that is mounted on a drive shaft. The housing comprises two separated chambers, i.e. a first chamber that is connected to the driven shaft and a second chamber which is separate from the first chamber, whereby the first chamber is connected via a channel with the second chamber, whereby around the drive gearwheel or driven gearwheel the second chamber is formed, whereby the form of the second chamber is such that when the gearwheel in question rotates, a gas flow is created around this gearwheel which causes a negative pressure in the channel by the venturi effect.

A transmission between a drive shaft and a driven shaft comprises a housing and at least a driven gearwheel that is mounted on the driven shaft and a drive gearwheel that is mounted on a drive shaft. The housing comprises two separated chambers, i.e. a first chamber that is connected to the driven shaft and a second chamber which is separate from the first chamber, whereby the first chamber is connected via a channel with the second chamber, whereby around the drive gearwheel or driven gearwheel the second chamber is formed, whereby the form of the second chamber is such that when the gearwheel in question rotates, a gas flow is created around this gearwheel which causes a negative pressure in the channel by the venturi effect.