Double-acting piston for swash-plate type compressors

A double-acting piston for use in a swash-plate type compressor of the type including a frame having at least one cylinder bore formed therein, a drive shaft axially extending through said frame, a swash plate secured on said drive shaft, and shoes arranged in sliding contact with said swash plate at opposite side surfaces thereof;

• said double-acting piston comprising:
• a pair of piston heads provided at opposite ends of said piston, said piston heads each having a first part which includes a first hollow cylindrical member extending axially inwardly of said piston and a second part which includes a second hollow cylindrical member extending radially outwardly from said first part, said piston heads each having a peripheral lateral surface adapted for sliding contact with an inner peripheral surface of said cylinder bore, said piston heads each being formed of at least one piece and said first and second hollow cylindrical members being formed of respective separate pieces;
• an intermediate coupling member interposed between said piston heads to couple same to each other, said intermediate coupling member comprising a piece separate from said at least one piece forming each of said piston heads;
• and
• means joining said piston heads and said intermediate coupling member to each other;
• said first parts of said piston heads each having opposed inner ends thereof spaced from each other and cooperating with said intermediate coupling member to define therebetween a central recess opening radially inwardly of said compressor, said first hollow cylindrical member forming said first part of each of said piston heads having an inner end surface formed with a protuberance projecting therefrom for respectively engaging one of said shoes, said protuberances being spaced from each other in the axial direction of said piston, said space between said protuberances being in said central recess opening defined between said inner ends of said first parts;,
• said swash plate having a peripheral fringe portion thereof engaged in said space between said protuberances via said shoes which respectively engage between one of said protuberances and said swash plate.

A double-acting piston for use in a swash-plate type compressor of the type including a frame having at least one cylinder bore formed therein, a drive shaft axially extending through said frame, a swash plate secured on said drive shaft, and shoes arranged in sliding contact with said swash plate at opposite side surfaces thereof;

• said double-acting piston comprising:
• a pair of piston heads provided at opposite ends of said piston, said piston heads each having a first part which includes a first hollow cylindrical member extending axially inwardly of said piston and a second part which includes a second hollow cylindrical member extending radially outwardly from said first part, said piston heads each having a peripheral lateral surface adapted for sliding contact with an inner peripheral surface of said cylinder bore, said piston heads each being formed of at least one piece and said first and second hollow cylindrical members being formed of respective separate pieces;
• said first hollow cylindrical member forming said first part of each of said piston heads having a flange integrally extending radially outwardly from an outer end thereof, and said second hollow cylindrical member forming said second part of each of said piston heads having an open inner end and a closed outer end formed with an outer end wall, said first hollow cylindrical member extending through said open inner end of said second hollow cylindrical member and having said flange joined to an inner side surface of said outer end wall of said second hollow cylindrical member;
• an intermediate coupling member interposed between said piston heads to couple same to each other, said intermediate coupling member interposed between said piston heads to couple same to each other, said intermediate coupling member comprising a piece separate from said at least one piece forming each of said piston heads;
• and
• means joining said piston heads and said intermediate coupling member to each other;
• said first hollow cylindrical members of said piston heads each having opposed inner ends thereof spaced from each other and cooperating with said intermediate coupling member to define therebetween a central recess opening radially inwardly of said compressor, said swash plate having a peripheral fringe portion thereof engaged with said inner ends of said first parts in said central recess via said shoes which respectively engage between said inner end of one of said first parts and said swash plate.

A double-acting piston for use in a swash-plate type compressor of the type including a frame having at least one cylinder bore formed therein, a drive shaft axially extending through said frame, a swash plate secured on said drive shaft, and shoes arranged in sliding contact with said swash plate at opposite side surfaces thereof, said double-acting piston comprising:

• a pair of piston heads provided at opposite ends of said piston, said piston heads each having a first part which includes a hollow body portion extending axially inwardly of said piston and a second part which includes a hollow cylindrical body portion extending radially outwardly from said first part, said piston heads each having a peripheral lateral surface adapted for sliding contact with an inner peripheral surface of said cylinder bore, said piston heads each being formed of a one-piece member forming said first and second parts;
• said one-piece member each comprising a hollow cylindrical first part and a second part having a radial portion integrally extending radially outwardly from an outer end of said first part and an axial portion integrally extending axially inwardly from a peripheral edge of said radial portion, said axial portion of said second part having said peripheral lateral surface adapted for sliding contact with an inner peripheral surface of said cylinder bore;
• an intermediate coupling member interposed between said piston heads to couple same to each other, said intermediate coupling member being formed of a piece separate from said at least one piece forming each of said piston heads;
• and means joining said piston heads and said intermediate coupling member to each other;
• wherein said first parts of said piston heads have opposed inner ends thereof spaced from each other and cooperating with said intermediate coupling member to define therebetween a central recess opening radially inwardly of said compressor, said swash plate having a peripheral fringe thereof engaged in said central recess via said shoes.