Swash plate with cobalt-tin alloy coating

Details Swash plate with cobalt-tin alloy coating Swash plate with cobalt-tin alloy coating

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 27/10 (2006.01) C23C 22/66 (2006.01) F04B 27/08 (2006.01)

Patent

CA 2323806

A swash plate type compressor (10) having a cylinder block (12, 14) with cylinder bores (18) disposed parallel to the axis of the cylinder block. A rotary shaft (22) rotatably mounted within the cylinder block carries an aluminium swash plate (20). The swash plate (20) is fixed in the rotary shaft (22) and has two facial surfaces (26) and an end surface (28). The swash plate (20) has a coating layer of at least 0.2 wt.% cobalt and the balance being tin. A piston (16) reciprocally fitted within the cylinder bore (18) contains shoes (24) which slideably intervene between the piston (16) and the swash plate facial surfaces (26). The shoes (24) transfer the rotational motion of the swash plate (20) to the linear motion of the piston (16). The coated surfaces (26) of the swash plate (20) are in slidable contact with the shoes (24). The coating on the swash plate (20) permits the use of low silicon alloy aluminium without the need of metal plating or high finish polishing.

L'invention concerne un compresseur (10) du type à plateau oscillant, qui comprend un bloc cylindre (12, 14) ayant des alésages (18) disposés parallèlement à l'axe du bloc cylindre. Un arbre tournant (22) monté sur roulement à l'intérieur du bloc cylindre porte un plateau oscillant en aluminium (20), lequel est fixé dans l'arbre tournant (22) et présente deux faces (26) et une surface d'extrémité (28). Le plateau oscillant (20) est muni d'un revêtement d'au moins 0,2 % en poids de cobalt, la matière d'équilibrage étant l'étain. Un piston alternatif (16) fixé à l'intérieur de l'alésage du cylindre (18) contient des semelles (24) qui coulissent entre le piston (16) et les faces (26) du plateau oscillant. Ces semelles (24) transfèrent le moment rotatif du plateau oscillant (20) au moment linéaire du piston (16). Les surfaces revêtues (26) du plateau oscillant (20) ont un contact de glissement avec les semelles (24). Le revêtement disposé sur le plateau oscillant (20) permet d'utiliser un aluminium faiblement allié au silicium sans nécessité de procéder à une galvanoplastie ou à un polissage de finition brillant.

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