Hydraulic drive device utilizing electric motor

A hydraulic drive device utilizing an electric motor comprising:

• an electric motor;
• a hydraulic pump driven by rotation of an output shaft of said electric motor;
• a hydraulic motor in which oil from said hydraulic pump is supplied through an operation-switching valve;
• a rotation transmission device that is connected to an output shaft of said hydraulic motor and performs speed increasing function;
• and
• a drive output shaft disposed on the output side of said rotation transmission device,
• wherein said rotation transmission device comprises
• an input shaft:
• a rotating body that is connected to said input shaft, acts by itself as a flywheel, and on the output side of which an internal gear is formed;
• and
• a gear mechanism for transmitting rotation of said rotating body to a drive output shaft disposed on an output shaft gear by allowing counter gears to mesh with said internal gear and the output shaft gear to mesh with these counter gears;
• wherein a protrusion is formed on either the outer circumference of said rotating body or a stationary frame, and a recess surrounding said protrusion is formed on the other.

A hydraulic drive device utilizing an electric motor comprising:

• an electric motor;
• a first rotation transmission device that is connected to an output shaft of said electric motor and performs speed increasing function;
• a hydraulic pump driven by rotation of an output shaft of said first rotation transmission device;
• a hydraulic motor in which oil from said hydraulic pump is supplied through an operation-switching valve;
• a second rotation transmission device that is connected to an output shaft of said hydraulic motor and performs speed-increasing function;
• and
• a drive output shaft disposed on the output side of said second rotation transmission device,
• wherein said rotation transmission device comprises
• an input shaft;
• a rotating body that is connected to said input shaft, acts by itself as a flywheel, and on the output side of which an internal gear is formed;
• and
• a gear mechanism for transmitting rotation of said rotating body to a drive output shaft disposed on an output shaft gear by allowing the output shaft gear to mesh with said internal gear;
• wherein a protrusion is formed on either the outer circumference of said rotating body or a stationary frame, and a recess surrounding said protrusion is formed on the other.

A hydraulic drive device utilizing an electric motor comprising:

• an electric motor;
• a hydraulic pump driven by rotation of an output shaft of said electric motor;
• a hydraulic motor in which oil from said hydraulic pump is supplied through an operation-switching valve;
• a rotation transmission device that is connected to an output shaft of said hydraulic motor and performs speed increasing function;
• and
• a drive output shaft disposed on the output side of said rotation transmission device,
• wherein said rotation transmission device comprises
• an input shaft;
• a rotating body that is connected to said input shaft, acts by itself as a flywheel, and on the output side of which an internal gear is formed;
• and
• a gear mechanism for transmitting rotation of said rotating body to a drive output shaft disposed on an output shaft gear by allowing the output shaft gear to mesh with said internal gear;
• wherein a protrusion is formed on either the outer circumference of said rotating body or a stationary frame, and a recess surrounding said protrusion is formed on the other.

A hydraulic drive device utilizing an electric motor comprising:

• an electric motor;
• a first rotation transmission device that is connected to an output shaft of said electric motor and performs speed increasing function;
• a hydraulic pump driven by rotation of an output shaft of said first rotation transmission device;
• a hydraulic motor in which oil from said hydraulic pump is supplied through an operation-switching valve;
• a second rotation transmission device that is connected to an output shaft of said hydraulic motor and performs speed-increasing function;
• and
• a drive output shaft disposed on the output side of said second rotation transmission device,
• wherein the hydraulic drive device utilizing an electric motor comprises a generator driven by rotation of said drive output shaft and a battery charged with electric power generated by said generator, and said electric motor is driven by the power of the battery, and
• wherein plural sets of said generator and battery are disposed, and as long as a battery of any one set is working, a battery of the other set is charged with electric power.

A hydraulic drive device utilizing an electric motor comprising:

• an electric motor;
• a hydraulic pump driven by rotation of an output shaft of said electric motor;
• a hydraulic motor in which oil from said hydraulic pump is supplied through an operation-switching valve;
• a rotation transmission device that is connected to an output shaft of said hydraulic motor and performs speed increasing function;
• and
• a drive output shaft disposed on the output side of said rotation transmission device,
• wherein the hydraulic drive device utilizing an electric motor comprises a generator driven by rotation of said drive output shaft and a battery charged with electric power generated by said generator, and said electric motor is driven by the power of the battery, and
• wherein plural sets of said generator and battery are disposed, and as long as a battery of any one set is working, a battery of the other set is charged with electric power.