초록 ▼

The present invention relates to an electrically driven aircraft cabin and ventilation and environmental control system. The system includes at least one inlet for capturing ram air, an electrically driven compressor for pressurizing the ram air, and a thermal conditioning subsystem for thermally co

The present invention relates to an electrically driven aircraft cabin and ventilation and environmental control system. The system includes at least one inlet for capturing ram air, an electrically driven compressor for pressurizing the ram air, and a thermal conditioning subsystem for thermally conditioning the pressurized ram air. The system further includes a subsystem for removing undesirable moisture from the thermally conditioned ram air.

대표청구항 ▼

The present invention relates to an electrically driven aircraft cabin and ventilation and environmental control system. The system includes at least one inlet for capturing ram air, an electrically driven compressor for pressurizing the ram air, and a thermal conditioning subsystem for thermally co

The present invention relates to an electrically driven aircraft cabin and ventilation and environmental control system. The system includes at least one inlet for capturing ram air, an electrically driven compressor for pressurizing the ram air, and a thermal conditioning subsystem for thermally conditioning the pressurized ram air. The system further includes a subsystem for removing undesirable moisture from the thermally conditioned ram air. rom said center section, said piston having an outer surface; a valve disposed within said bore for opening and closing said bore to and from said fluid passage, said valve being biased to be closed by a spring disposed between said valve and said piston; and a member interlocking with said output operation device so as to contact with said outer surface of said piston, wherein, when said output operation device is adjacent to said neutral position and pressure fluid in said fluid passage forcedly opens said valve and flows into said bore, said member drains said pressure fluid in said bore to a low-pressured area. 2. The hydrostatic transmission as set forth in claim 1, wherein said low-pressured area is said fluid sump. 3. The hydrostatic transmission as set forth in claim 1, wherein said low-pressured area is said fluid passage for returning fluid from said hydraulic motor to said hydraulic pump. 4. A hydrostatic transmission, comprising: a housing formed with a fluid sump; a center section disposed within said fluid sump; a hydraulic pump mounted on said center section; a hydraulic motor mounted on said center section; a fluid passage formed in said center section for hydraulically connecting said hydraulic pump with said hydraulic motor; a bore opening at an outer surface of said center section in communication with said fluid passage; an output operation device for controlling discharged fluid of said hydraulic pump, wherein said output operation device is moved to an operational position from a neutral position; a piston reciprocally inserted into said bore so as to be allowed to project outward from said center section, said piston having an outer surface with an opening; a valve disposed within said bore for opening and closing said bore to and from said fluid passage, said valve being biased to be closed by a spring disposed between said valve and said piston; and a member interlocking with said output operation device so as to contact with said outer surface of said piston, said member having a passage in communication with said fluid sump, wherein, when said output operation device is adjacent to said neutral position, said passage of said member is brought into communication with said opening of said piston so that, if pressure fluid in said fluid passage forcedly opens said valve and flows into said bore, said pressure fluid in said bore is introduced into said fluid sump through said opening of said piston and said passage of said member. 5. The hydrostatic transmission as set forth in claim 4, wherein said opening of said piston is restricted. 6. The hydrostatic transmission as set forth in claim 4, wherein said passage of said member is a groove formed on a contact surface of said member contacting with said outer surface of said piston. 7. A hydrostatic transmission, comprising: a housing formed with a fluid sump; a center section disposed within said fluid sump; a hydraulic pump mounted on said center section; a hydraulic motor mounted on said center section; a pair of fluid passages formed in said center section for hydraulically connecting said hydraulic pump with said hydraulic motor; a pair of bores opening at the same outer surface of said center section in communication with said respective fluid passages; an output operation device for controlling discharged fluid of said hydraulic pump, wherein said output operation device is moved to operational positions from a neutral position; a pair of pistons reciprocally inserted into said respective bores so as to be allowed to project outward from said center section, each of said pistons having an outer surface with an opening; a pair of relief valves disposed within said respective bores so as to pass and shut a flow of fluid from said respective fluid passages to said respective bores, each of said relief valves being biased to shut said flow of fluid by a spring disposed between said relief valve and said piston, and each of