Abstract: A compressor includes a compression mechanism drawing in, compressing and discharging fluid and a housing accommodating therein the compression mechanism. The housing has therein a discharge chamber into which the fluid compressed by the compression mechanism is discharged. A silencing and cooling device is provided in the discharge chamber to cool the fluid discharged in the discharge chamber and reduce pressure fluctuation. A dispersion wall is provided in the discharge chamber on downstream side of the discharge chamber that is opposite from an inflow port with respect to flowing direction of the discharged fluid. The dispersion wall is disposed to cover a part of the silencing and cooling device and cover at least a part of the inflow port.

Abstract: A compressor includes a compression mechanism drawing in, compressing and discharging fluid and a housing accommodating therein the compression mechanism. The housing has therein a discharge chamber into which the fluid compressed by the compression mechanism is discharged. A silencing and cooling device is provided in the discharge chamber to cool the fluid discharged in the discharge chamber and reduce pressure fluctuation. A dispersion wall is provided in the discharge chamber on downstream side of the discharge chamber that is opposite from an inflow port with respect to flowing direction of the discharged fluid. The dispersion wall is disposed to cover a part of the silencing and cooling device and cover at least a part of the inflow port.

Abstract: A rotating electric machine includes a rotor having a cylindrical peripheral wall having a permanent magnet arranged circumferentially therein, and a stator provided on an outer side of the peripheral wall of the rotor. Further, the rotating electric machine includes a planetary roller provided in a planetary roller mechanism chamber on an inner side of the peripheral wall of the rotor so as to be rotated by a rotation of the rotor transmitted from the peripheral wall to a planetary roller surface of the planetary roller, an output shaft provided on the inner side of the peripheral wall of the rotor so as to be rotated by a rotation of the planetary roller transmitted to the output shaft via the planetary roller surface, and magnetic lubricating oil included in the inner side of the peripheral wall of the rotor.

Abstract: A roots type fluid machine includes suction and discharge ports, rotary shafts and a pair of rotors. The rotor has a number n of lobe and valley portions with apex and bottom ends. The lobe portions are located on imaginary lines extending radially from an axis of the rotary shaft. The outer surface of each one of the rotors is generated by rotating an outline of the rotor including an arc and involute and envelope curves around and moving the outline in the direction of the axis. The arc has a radius R and a center located on the imaginary line. The involute curve is formed by an imaginary base circle having a radius r and a center located on the axis. The envelope curve is formed by an arc having a radius R. The number n is four or more. A torsional angle ? is over 360/n degrees.

Abstract: A pump mounting structure is disclosed. The structure includes a mounting surface on a body having an insertion recess, and at least one mounting member having a mounting portion inserted into the insertion recess. The mounting portion has an outer surface and an insertion hole through which a bolt is inserted. A first gap is formed between the insertion hole and the bolt. A second gap is formed between the outer surface of the mounting portion and an inner surface of the insertion recess. A seal member is disposed on an open side of the insertion recess.

Abstract: A centrifugal compressor for compressing gas has a casing, a rotary shaft, an impeller, a diffuser, a first scroll, a second scroll, a first passage, a second passage, and a switching member. The rotary shaft is supported by the casing. The impeller is rotatably fixed to the rotary shaft, and sends the gas radially outward to a flow path downstream thereof. The diffuser is formed around the impeller. The first scroll is formed around the diffuser. The second scroll is formed between the diffuser and the impeller. The first passage is formed from the impeller to the first scroll through the diffuser. The second passage is formed from the impeller to the second scroll. The switching member switches the flow path between the first passage and the second passage by opening and closing the diffuser.

Abstract: A hydraulic system that can implement effective practical use of energy is provided. A hydraulic system according to the present invention has a hydraulic pump driven by a hydraulic pump motor, a loading cylinder and a power steering cylinder which are driven by pressure oil supplied from the hydraulic pump, and power supply means for supplying power to the hydraulic pump motor. The power supply means comprises a stack of a fuel cell, a fuel supply passage for supplying hydrogen gas to the stack, fuel circulating passages in which a hydrogen pump for joining unreacted hydrogen gas discharged from the stack into the fuel supply passage to circulate hydrogen gas is disposed, and a regenerator which is driven by pressure oil to generate rotational force. The hydrogen pump is rotationally driven by the regenerator.

Abstract: A roots type fluid machine includes suction and discharge ports, rotary shafts and a pair of rotors. The rotor has a number n of lobe and valley portions with apex and bottom ends. The lobe portions are located on imaginary lines extending radially from an axis of the rotary shaft. The outer surface of each one of the rotors is generated by rotating an outline of the rotor including an arc and involute and envelope curves around and moving the outline in the direction of the axis. The arc has a radius R and a center located on the imaginary line. The involute curve is formed by an imaginary base circle having a radius r and a center located on the axis. The envelope curve is formed by an arc having a radius R. The number n is four or more. A torsional angle ? is over 360/n degrees.

Abstract: A hydraulic system that can implement effective practical use of energy is provided. A hydraulic system according to the present invention has a hydraulic pump driven by a hydraulic pump motor, a loading cylinder and a power steering cylinder which are driven by pressure oil supplied from the hydraulic pump, and power supply means for supplying power to the hydraulic pump motor. The power supply means comprises a stack of a fuel cell, a fuel supply passage for supplying hydrogen gas to the stack, fuel circulating passages in which a hydrogen pump for joining unreacted hydrogen gas discharged from the stack into the fuel supply passage to circulate hydrogen gas is disposed, and a regenerator which is driven by pressure oil to generate rotational force. The hydrogen pump is rotationally driven by the regenerator.

Abstract: It is intended to provide a fuel cell system more capable of exhibiting effects of downsizing and reduction in weight. The fuel cell system of this invention has a stack and a regenerator that are provided in parallel to an air compressor. An air supply passage to which an air discharged from the air compressor is supplied and an air discharge passage for discharging an unreacted air to the downstream are connected to the stack. A regeneration air supply passage to which the air discharged from the air compressor is supplied and a regeneration air discharge passage for discharging the air to the downstream are connected to the regenerator. A fuel pump has a structure that the fuel pump is rotatively driven by the regenerator.

Abstract: A fuel cell system which can exhibit a better result of a reduction in size and weight is provided. The fuel cell system of the present invention comprises a stack of fuel cells which generate electricity by receiving a supply of hydrogen gas and air, a fuel supply passage for supplying hydrogen gas to the stack, a fuel circulation and supply passage and a fuel circulation and discharge passage equipped with a fuel pump for causing any unreacted hydrogen gas discharged from the stack to join the fuel supply passage and be circulated, a cooling water pump for supplying cooling water to the stack, and a regenerator driven by the cooling water supplied from the cooling water pump for generating a rotary force. The hydrogen pump is adapted to be driven for rotation by the regenerator.

Abstract: A compressor, which is cooled by cooling medium, includes a compression chamber, a first cooling chamber and a second cooling chamber. In the compression chamber, gas is compressed and then discharged therefrom. The first cooling chamber, in which the cooling medium flows, is provided so as to adjoin the compression chamber for cooling the gas in the compression chamber. The second cooling chamber adjoins the first cooling chamber. The second cooling chamber has a gas passage in which the discharged gas flows and a medium passage in which the cooling medium flows. The medium passage is arranged so as to restrain transmission of heat of the discharged gas in the gas passage to the cooling medium in the first cooling chamber.

Abstract: A roots-type fluid machine including a set of rotors and a rotor housing is disclosed. The rotor housing accommodates the rotors and has a suction space. The set of rotors mesh with each other and rotate in the rotor housing so that fluid is drawn into the suction space and discharged from the rotor housing. Each of the set of rotors includes a tooth having a twisted portion and a different shape variation portion. The twisted portion has a twist angle that changes linearly or non-linearly about a rotation axis of the corresponding rotor with respect to the variation of the position in the direction of the axis. The different shape variation portion has a twisted angle that changes by a smaller degree than the variation of the twist angle of the twisted portion.

Abstract: A composite fluid machine has a first and a second fluid delivering mechanisms. The first fluid delivering mechanism includes an accommodation chamber, a movable body, and a suction space. The movable body is accommodated in the accommodation chamber.. The suction space is defined by the accommodation chamber and the movable body. The suction space is connected to the inlet, and the flow rate of the fluid introduced into the suction space is displaced. The movable body performs a suction movement and a discharge movement.. The second fluid delivering mechanism is combined with the first fluid delivering mechanism and is located upstream of the first fluid delivering mechanism to deliver the fluid to the suction space of the first fluid delivering mechanism.. Lobes of helical roots rotors are twisted in a respective direction around the rotational axis.

Abstract: A centrifugal compressor for compressing gas has a casing, a rotary shaft, an impeller, a diffuser, a first scroll, a second scroll, a first passage, a second passage, and a switching member. The rotary shaft is supported by the casing. The impeller is rotatably fixed to the rotary shaft, and sends the gas radially outward to a flow path downstream thereof. The diffuser is formed around the impeller. The first scroll is formed around the diffuser. The second scroll is formed between the diffuser and the impeller. The first passage is formed from the impeller to the first scroll through the diffuser. The second passage is formed from the impeller to the second scroll. The switching member switches the flow path between the first passage and the second passage by opening and closing the diffuser.

Abstract: A roots type fluid machine includes a housing, a pair of parallel rotary shafts and two-lobe rotors. Each rotor includes two lobe portions and two well portions. Each lobe portion has a profile of convex arc with a radius R and each well portion has a profile of concave arc which is an envelope of the convex arc of the lobe portion. The rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs. The base radius r is set in a range L/(2?{square root over ( )}2)<r<0.3(?{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(?{square root over ( )}2)/16}?L<R<{(27?5?{square root over ( )}2)/56}L.

Abstract: A roots compressor has a housing, a rotary shaft, a rotor and a layer. The housing defines a pump chamber, a suction port and a discharge port. The suction port and the discharge port adjoin to the pump chamber. The rotary shaft is rotatably supported by the housing. The rotor is connected to the rotary shaft and contained in the pump chamber. Fluid introduced into the pump chamber through the suction port is discharged to the outside of the pump chamber through the discharge port by rotation of the rotor which is driven through the rotary shaft. The layer is formed on an inner peripheral surface of the housing, which defines the pump chamber. The layer is thinner from a side adjacent to the suction port toward a side adjacent to the discharge port in circumferential direction of the housing.

Abstract: A centrifugal compressor has a housing assembly and an impeller rotatably connected to the housing assembly. Gas introduced into the housing assembly by rotation of the impeller is compressed at least by centrifugal force. One aspect of the present invention is that the impeller includes an inducer portion having a pressure surface and a suction surface and a hole extending between the pressure surface and the suction surface. Another aspect of the present invention is that the centrifugal compressor includes a diffuser located downstream of the impeller, a volute in communication with an outlet of the diffuser, and a reflux passage connecting the diffuser with the volute for returning part of gas in the volute to the diffuser.

Abstract: A roots type fluid machine includes a housing, a pair of parallel rotary shafts and two-lobe rotors. Each rotor includes two lobe portions and two well portions. Each lobe portion has a profile of convex arc with a radius R and each well portion has a profile of concave arc which is an envelope of the convex arc of the lobe portion. The rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs. The base radius r is set in a range L/(2?{square root over ( )}2)<r<0.3(?{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(?{square root over ( )}2)/16}?L<R<{(27?5?{square root over ( )}2)/56}L.

Abstract: A centrifugal compressor has a housing assembly and an impeller rotatably connected to the housing assembly. Gas introduced into the housing assembly by rotation of the impeller is compressed at least by centrifugal force. One aspect of the present invention is that the impeller includes an inducer portion having a pressure surface and a suction surface and a hole extending between the pressure surface and the suction surface. Another aspect of the present invention is that the centrifugal compressor includes a diffuser located downstream of the impeller, a volute in communication with an outlet of the diffuser, and a reflux passage connecting the diffuser with the volute for returning part of gas in the volute to the diffuser.