Variable displacement swash plate compressor

Abstract

A variable displacement swash plate compressor comprises a rotating shaft, a swash plate fitted on the rotating shaft to engage the rotating shaft slidably and to be variable in inclination relative to the rotating shaft, thereby rotating synchronously with the rotating shaft, a first spring for forcing the swash plate in the direction decreasing the inclination of the swash plate, a second spring for forcing the swash plate inclined to near the minimum inclination in the direction increasing the inclination of the swash plate, and a damper for countering the short period variation of the inclination of the swash plate inclined to near the minimum inclination.

1 . A variable displacement swash plate compressor comprising a rotating shaft, a swash plate fitted on the rotating shaft to engage the rotating shaft slidably and to be variable in inclination relative to the rotating shaft, thereby rotating synchronously with the rotating shaft, a first spring for forcing the swash plate in the direction decreasing the inclination of the swash plate, a second spring for forcing the swash plate inclined to near the minimum inclination in the direction increasing the inclination of the swash plate, and a damper for countering the short period variation of the inclination of the swash plate inclined to near the minimum inclination.  
   
   
       2 . A variable displacement swash plate compressor of  claim 1 , wherein the damper forms a case for accommodating the second spring.  
   
   
       3 . A variable displacement swash plate compressor of  claim 2 , wherein the second spring fits on the rotating shaft, the damper comprises a cylindrical body provided with an annular bottom wall opposing the swash plate and slidably fitting on the rotating shaft and a circumferential sidewall, and a cap slidably fitting in the open end of the cylindrical body and fitting on the rotating shaft, the second spring abuts the bottom wall of the cylindrical body at the end adjacent to the swash plate and abuts the cap at the end distanced from the swash plate, and the cap is prevented from moving in the direction away from the swash plate.  
   
   
       4 . A variable displacement swash plate compressor of  claim 3 , wherein a snap ring fixed to the rotating shaft prevents the cap from moving in the direction away from the swash plate.  
   
   
       5 . A variable displacement swash plate compressor of  claim 3 , wherein the cap is press fitted on the rotating shaft to be prevented from moving in the direction away from the swash plate.  
   
   
       6 . A variable displacement swash plate compressor of  claim 3 , wherein the cylindrical body or the cap is provided with a pore formed therethrough.  
   
   
       7 . A variable displacement swash plate compressor of  claim 3 , wherein the circumferential sidewall of the cylindrical body is provided with a pore formed therethrough and elongated in the longitudinal direction of the cylindrical body, and wherein the elongated pore overlaps the cap and the opening area of the elongated pore decreases as the inclination of the swash plate decreases.  
   
   
       8 . A variable displacement swash plate compressor of  claim 3 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       9 . A variable displacement swash plate compressor of  claim 4 , wherein the cylindrical body or the cap is provided with a pore formed therethrough.  
   
   
       10 . A variable displacement swash plate compressor of  claim 5 , wherein the cylindrical body or the cap is provided with a pore formed therethrough.  
   
   
       11 . A variable displacement swash plate compressor of  claim 4 , wherein the circumferential sidewall of the cylindrical body is provided with a pore formed therethrough and elongated in the longitudinal direction of the cylindrical body, and wherein the elongated pore overlaps the cap and the opening area of the elongated pore decreases as the inclination of the swash plate decreases.  
   
   
       12 . A variable displacement swash plate compressor of  claim 5 , wherein the circumferential sidewall of the cylindrical body is provided with a pore formed therethrough and elongated in the longitudinal direction of the cylindrical body, and wherein the elongated pore overlaps the cap and the opening area of the elongated pore decreases as the inclination of the swash plate decreases.  
   
   
       13 . A variable displacement swash plate compressor of  claim 4 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       14 . A variable displacement swash plate compressor of  claim 5 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       15 . A variable displacement swash plate compressor of  claim 6 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       16 . A variable displacement swash plate compressor of  claim 7 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       17 . A variable displacement swash plate compressor of  claim 9 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       18 . A variable displacement swash plate compressor of  claim 10 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       19 . A variable displacement swash plate compressor of  claim 11 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.  
   
   
       20 . A variable displacement swash plate compressor of  claim 12 , wherein the cylindrical body is provided with a projection for abutting the end face of the cap distanced from the bottom wall of the cylindrical body at the open end.