摘要:
A piston for a swash plate type compressor, including a head portion slidably fitted in a cylinder bore in a cylinder block of the compressor, a neck portion slidably engaging a swash plate of the compressor, and a connecting portion connecting the head and neck portions, wherein the head portion comprises a circular body portion, and an inner sliding projection extending toward the neck portion from a radially inner circumferential part of the body portion which corresponds to a radially inner portion of the cylinder block. The inner sliding projection has a sliding surface for sliding contact with an inner circumferential surface of the cylinder bore. The sliding surface is symmetrical with respect to a plane including centerlines of the piston and the cylinder block. The connecting portion connects the inner sliding projection and the neck portion.
摘要:
A method of producing a piston for a swash plate type compressor including a head portion which is slidably fitted in a cylinder bore of the compressor, and an engaging section which engages a swash plate of the compressor, wherein a blank including a hollow cylindrical head section corresponding to the head portion and an engaging section corresponding to the engaging portion is formed by a pore-free die-casting method, such that the head section and the engaging section are formed integrally with each other at the closed end by the head section, and wherein a closing member is fixed to the hollow cylindrical head section so as to close its open end, for thereby providing the head portion of the piston.
摘要:
Method of producing a blank for manufacturing a single-headed piston having a head portion and a neck portion formed integrally with the head portion, for engagement with a drive member, the method including: a step of manufacturing a body member including a twin neck section and two cylindrical hollow head sections formed integrally with the twin neck section so as to extend from opposite ends of the twin neck section, the twin neck section consisting of two portions which are mutually integrally formed in series with each other and which correspond to the neck portions of respective two single-headed pistons, each hollow head section being open at at least one of opposite ends thereof which is remote from the twin neck section; a step of manufacturing two closing members each for closing an open end of the corresponding hollow head section; and a step of fixing each closing member to the body member, so as to close the open end of the corresponding hollow head section.
摘要:
A variable displacement type compressor circulates a refrigerant in an air conditioning circuit. The compressor has a compression mechanism and a displacement controller. The compression mechanism compresses and discharges the refrigerant. The displacement controller controls the discharge amount of the refrigerant of the compressor. The displacement controller further includes a normal control means and a protective control means. The normal control means controls the displacement based on a cooling load. The protective control means controls the displacement based on the value in connection with the rotational speed of the compressor and the actual operating information of the compressor.
摘要:
A piston includes an engagement portion that engages with a swash plate. The engagement portion is provided with a pair of arm portions and a coupling portion for coupling base ends of the arm portions each other. An axial rib extending in the axial direction is integrally provided in a central part of a back surface of the coupling portion in the width direction orthogonal to a central axis of a head portion of the piston. An accommodation groove is formed on an inner circumferential surface of a cylinder bore corresponding to the axial rib, such that the axial rib does not interfere with the cylinder bore when the piston moves to the top dead center.
摘要:
A swash plate of a swash-plate compressor is subjected to sliding on shoes and is required to have excellent seizure resistance and wear resistance under the dry lubricating condition. The swash plate according to the present invention is provided with the surface-treated layer, i,e., the intermediate layer consisting of Cu, Sn or metal phosphate, and a sliding contact layer consisting of MoS.sub.2 and/or graphite and thermosetting resin.
摘要:
Swash plate type compressor including a cylinder block having cylinder bores arranged along a circle, a drive shaft aligned with the circle, a swash plate rotated with the drive shaft, and single-headed pistons each including a head portion engaging the cylinder bore, and a neck portion engaging the swash plate, and wherein each piston is reciprocated by the swash plate rotated by the drive shaft, and the head portion includes a circular body portion, and an outer sliding portion and an inner sliding portion which are disposed between the body portion and the neck portion and which slidably engage respective circumferential portions of the cylinder bore which correspond to respective radially outer and inner portions of the cylinder block. Length from the end face of the body portion to the remote end of the inner sliding portion is larger than the corresponding length of the outer sliding portion. The inner sliding portion has a distal sliding part spaced from the end face by at least 40% of the entire piston length and having a central angle of not larger than 120° and a length of at least 5% of the entire piston length.
摘要:
A single-headed piston for a swash plate type compressor including a head portion having an outer circumferential surface for sliding contact with an inner circumferential surface of a cylinder bore formed in a cylinder block of the compressor, and an engaging portion engaging a swash plate of the compressor, characterized in that; the outer circumferential surface of the head portion includes a cylindrical surface and a curved surface which is formed adjacent to at least one of opposite axial ends of the cylindrical surface, so as to smoothly extend from at least one circumferential part of the cylindrical surface, the curved surface being formed such that a radial distance between a centerline of the cylindrical surface and the curved surface gradually decreases in an axial direction of the cylindrical surface from the corresponding axial end of the cylindrical surface toward the corresponding axial end of the piston, and such that a radius of curvature of a cross sectional shape of the curved surface taken in a plane which includes the centerline of the cylindrical surface is larger than a diameter of the inner circumferential surface of the cylinder bore.
摘要:
A swash plate (3, 18) and pistons (6, 17) included in a swash plate type compressor are made of an aluminum alloy as a base material. Rotation-preventive interfering surfaces (6d, 17d) of the pistons (6, 17) which interfere with another member to restrain the pistons from rotation about their axes are coated with a film of a solid lubricant. Sliding contact surfaces (6a, 17a) of the pistons (6, 17) in sliding contact with surfaces defining cylinder bores (5, 16) are coated with a film of a solid lubricant. When the rotation-preventive interfering surfaces (6d) of the pistons (6) come into impulsive contact with the outer circumference (3b) of the swash plate (3), the outer circumference (3b) of the swash plate (3) is coated with a lubricating film.
摘要:
A swash plate (3, 18) included in a swash plate type compressor for compressing a refrigerant is made of an aluminum alloy as a base material. Sliding contact surfaces (3a, 18a) of the swash plate (3, 18) in sliding contact with shoes (7, 19) linking the swash plate (3, 18) to pistons (6, 17) are coated with a film of a solid lubricant containing at least one lubricating material selected from molybdenum disulfide, tungsten disulfide and graphite by a transfer method. Therefore, the performance of the film and the productivity thereof are improved.