A screw compressor element may have a housing; a cylinder bearing including an inner ring, an outer ring, a raceway, and a cylindrical rolling element that contacts the inner ring and the outer ring at a location of the raceway thereof; and a ball bearing including an inner ring, an outer ring, a raceway, and a ball shaped rolling element that contacts the inner ring and the outer ring at a location of the raceway thereof, wherein a rotor is rotatably arranged by way of the cylinder bearing and the ball bearing.

An oil pump is configured to include a rotor, a drive shaft that drives the rotor to rotate, a rotor chamber in which the rotor is contained, an inlet port and an outlet port each provided in the vicinity of the rotor chamber, and a pump cover. The pump cover is made of a resin. On a portion of an outer surface side of the pump cover corresponding to an inner portion, in which oil circulates, of the pump cover, a rib that has an erecting wall shape is provided.

Described is a method for manufacturing a diaphragm assembly through the use of injection molding. The method can avoid the use of PTFE as a chemically resistant coating. Further, the method can increase overall adherence of a polymer diaphragm to an insert through the use of an interference surface on at least the surface of a head of the insert.

An oil pump includes: a first core in which an inner rotor having external teeth and an outer rotor having internal teeth are housed; a housing having a recess in which the first core is held; a second core disposed in contact with the first core in an axial direction; and a cover having a holding hole in which the second core is held. The first core has a first recess/projection portion formed on a first axial end surface at a side opposite to an axial end surface opposing a bottom wall of the recess. The second core has a second recess/projection portion formed on a second axial end surface that is in contact with the first axial end surface. A gap is formed between opposing surfaces of the housing and the cover in a state where the first and second axial end surfaces are in contact with each other.

A compressor may include a shell assembly, orbiting and non-orbiting scrolls, a bearing housing, a bushing, a damper, and a fastener. The bearing housing includes a first aperture. The bushing may include an axial end abutting the bearing housing. The bushing may extend through a second aperture of the non-orbiting scroll. The bushing may include a third aperture. The damper may be received in a pocket that may be defined by and disposed radially between an outer diametrical surface of the bushing and an inner diametrical surface of the non-orbiting scroll. The damper may be at least partially disposed within the second aperture and may encircle the second portion of the bushing. The fastener may include a shaft portion and a flange portion. The shaft portion may extend through the third aperture and into the first aperture. The flange portion may contact a first axial end of the damper.

A screw compressor for a utility vehicle includes at least one housing and at least one air-oil separator holder arranged at the housing. The air-oil separator holder is manufactured from a non-corrosive material. A relief valve is provided, which is arranged in the air-oil separator holder and by which the interior of the screw compressor can be relieved of pressure.

A compressor includes a housing, and an anticorrosive coating covering a surface of the housing. The anticorrosive coating includes a base layer applied on the surface of the housing, and a surface layer applied on the base layer. Both the base layer and the surface layer are organic coatings. Thus, the housing of the compressor is effectively separated from the external environment by means of the two organic coatings, so as to ensure that the compressor is not corroded; moreover, the anticorrosive coating does not contain a metal coating, thereby preventing the problem of the compressor being severely corroded due to an exposed metal coating.

There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. An outer peripheral surface of the piston is a curved surface.

An oil pump is configured to include a rotor, a drive shaft that drives the rotor to rotate, a rotor chamber in which the rotor is contained, an inlet port and an outlet port each provided in the vicinity of the rotor chamber, and a pump cover. The pump cover is made of a resin. On a portion of an outer surface side of the pump cover corresponding to an inner portion, in which oil circulates, of the pump cover, a rib that has an erecting wall shape is provided.

Oleophobic and/or philic surface(s) are utilized for oil separation, direction, and/or collection in a refrigeration system. Surfaces of component(s) of a refrigeration system (compressor, oil separator, evaporator, etc.) are produced to be oleophobic or philic. The oleophobic and/or philic surfaces are utilized to direct a flow path of oil within the refrigeration system or to prevent oil connection in an area. Refrigerant phobic and/or lubricant phobic material(s) also may be utilized to help promote separation of refrigerant vapor from refrigerant liquid and/or from oil in refrigeration systems.