A scroll compressor includes an orbiting bedplate which has an oil passage through which oil flows outward in a radial direction of the orbiting bedplate, a lap-side oil supply hole that causes the oil passage to communicate with a lap-formation surface of the orbiting lap, and a thrust-surface-side oil supply hole that causes the oil passage to communicate with a thrust surface of the orbiting bedplate that is opposite to the lap-formation surface of the orbiting bedplate. An opening and closing mechanism provided in the oil passage closes the thrust-surface-side oil supply hole when the pressure of oil that is drawn from an oil sump by an oil pump and supplied into the oil passage is low, and opens the thrust-surface-side oil supply hole when the pressure of the oil is high.

A scroll compressor includes an orbiting bedplate which has an oil passage through which oil flows outward in a radial direction of the orbiting bedplate, a lap-side oil supply hole that causes the oil passage to communicate with a lap-formation surface of the orbiting lap, and a thrust-surface-side oil supply hole that causes the oil passage to communicate with a thrust surface of the orbiting bedplate that is opposite to the lap-formation surface of the orbiting bedplate. An opening and closing mechanism provided in the oil passage closes the thrust-surface-side oil supply hole when the pressure of oil that is drawn from an oil sump by an oil pump and supplied into the oil passage is low, and opens the thrust-surface-side oil supply hole when the pressure of the oil is high.

The utility model relates to internal cycloidal gear mechanisms and can be used in various branches of mechanical engineering as working members of hydraulic machines (pumps and engines), compressors, internal combustion engines, as well as in planetary gearboxes, in particular in technical systems for drilling and repairing oil and gas wells. The problems to be solved by the utility model include the improvement of the quality of the process of designing working members having a cycloidal tooth profile, as well as the substantiation of the conditions for modifying cycloidal face profiles (by choosing the required combination of dimensionless gearing coefficients) in order to achieve the maximum or minimum open area of the gerotor mechanism having a different kinematic ratio.

The utility model relates to internal cycloidal gear mechanisms and can be used in various branches of mechanical engineering as working members of hydraulic machines (pumps and engines), compressors, internal combustion engines, as well as in planetary gearboxes, in particular in technical systems for drilling and repairing oil and gas wells. The problems to be solved by the utility model include the improvement of the quality of the process of designing working members having a cycloidal tooth profile, as well as the substantiation of the conditions for modifying cycloidal face profiles (by choosing the required combination of dimensionless gearing coefficients) in order to achieve the maximum or minimum open area of the gerotor mechanism having a different kinematic ratio.

An electric pump includes: a motor housing; a pump housing adjacent to the motor housing; a rotor accommodated in the motor housing and axially supported by a rotating shaft; a stator disposed radially outward of the rotor and fixed to the motor housing; a pump unit accommodated in the pump housing and configured to suck and discharge a fluid by rotation of the rotor; and a cup-shaped can provided between the rotor and the stator to prevent the fluid in the pump unit from being introduced into the stator. A seal member is disposed between the can and the motor housing, and a communication path communicating inner and outer sides of the can is formed between the motor and pump housings at a position closer to an opening side of the can than the seal member.

An arrangement (100) for specifying the pressure (64), produced by a pump (30) driven by an electric motor (31), includes a processor (116) which derives a target pressure value (62, 118) from an internal torque value (114) and a loss torque (108). The arrangement (100) further derives (112) the internal torque value (114) from a motor current value (110) and a motor constant k.sub.e.

An arrangement (100) for specifying the pressure (64), produced by a pump (30) driven by an electric motor (31), includes a processor (116) which derives a target pressure value (62, 118) from an internal torque value (114) and a loss torque (108). The arrangement (100) further derives (112) the internal torque value (114) from a motor current value (110) and a motor constant k.sub.e.

Provided is an internal gear pump. The shape of any one of a plurality of external teeth and a plurality of internal teeth of the pump is formed on the basis of formulae (1)-(5).
r=rodr.Math.cos ,Formula (1):
Px=(rodr)+1/4dr{1cos(2)},Formula (2):
Py=1/4dr{2+sin(2)},Formula (3):
Qx=Pxr.Math.cos ,Formula (4):
Qy=Py+r.Math.sin Formula (5):.

Provided is an internal gear pump. The shape of any one of a plurality of external teeth and a plurality of internal teeth of the pump is formed on the basis of formulae (1)-(5).
r=rodr.Math.cos ,Formula (1):
Px=(rodr)+1/4dr{1cos(2)},Formula (2):
Py=1/4dr{2+sin(2)},Formula (3):
Qx=Pxr.Math.cos ,Formula (4):
Qy=Py+r.Math.sin Formula (5):.

An electric motor, and the electric motor includes a stator core provided on a stator, a plurality of teeth provided on the stator core, a coil wound body attached to the tooth, an inner flange portion provided at an inner diameter side of a bobbin, a first engagement portion provided at one end side in a width direction of the inner flange portion, and a second engagement portion provided at the other end side in the width direction of the inner flange portion, the first engagement portion being provided to be located at an outer side in a diameter direction than the second engagement portion of the adjacent coil wound body in a moving direction, the second engagement portion being provided to be located at an outer side in a diameter direction than the first engagement portion of the adjacent coil wound body in a moving direction.