Hydraulic system and driving unit with deceleration mechanism

A driving unit with deceleration mechanism, comprising:

• a drive motor that serves as a power source for driving a drive-target output shaft disposed on a reference axis;
• a drive shaft that is disposed on the reference axis on a first side in a reference axis direction and rotated around the axis by rotary power from the drive motor;
• a deceleration mechanism that decelerates rotary power of the drive shaft and outputs the decelerated rotary power toward the output shaft disposed on a second side in the reference axis direction, which is opposite to the first side;
• and
• a unit case that accommodates the drive motor and the deceleration mechanism,
• wherein the deceleration mechanism has a hypocycloid-type deceleration mechanism, and a microtraction-type deceleration mechanism disposed on at least one of an upstream side and a downstream side of the hypocycloid-based deceleration mechanism in a power transmission direction.

A hydraulic system, comprising:

• a rotational shaft;
• a hydraulic rotor supported by the rotational shaft so as to be incapable of relative rotation;
• an output adjuster that varies a volume of the hydraulic rotor;
• a control shaft that tilts the output adjuster in accordance with rotation around an axis;
• a drive motor that produces rotational power for operating the control shaft around the axis;
• a drive shaft disposed on a reference axis that is the same axis as the axis of the control shaft and operably driven around the axis by the drive motor;
• a deceleration mechanism that decelerates rotary power operably input from the drive shaft and outputs the decelerated rotary power toward the control shaft;
• and
• a housing that accommodates the hydraulic rotor, the output adjuster, and the deceleration mechanism,
• wherein the deceleration mechanism has a hypocycloid-type deceleration mechanism disposed on the reference axis,
• wherein the housing includes a hydraulic case that accommodates the hydraulic rotor and the output adjuster, and a unit case that accommodates the deceleration mechanism and the drive motor and is removably connected to the hydraulic case,
• wherein the hydraulic case has a control shaft bearing hole that opens an end face of the control shaft outward, and
• wherein the unit case is connected to the hydraulic case to cover the control shaft bearing hole, with an output member of the hypocycloid-type deceleration mechanism being connected to the control shaft so as to be incapable of relative rotation around the reference axis.