Fluid coupling

Abstract

A pulsation absorber is provided in a fluid channel formed in a body of a fluid coupling. Fluid flows through the fluid channel in an assembled state. The pulsation absorber is arranged to deform in a same direction as the fluid to flow in the fluid channel pulsates. The pulsation absorber thereby absorbs pulsation of the fluid.

1 . A fluid coupling comprising: 
 a body formed with a fluid channel; and    a pulsation absorber provided in the fluid channel, and arranged to deform in a same direction as fluid to flow in the fluid channel pulsates, and thereby to absorb pulsation of the fluid.    
   
   
       2 . The fluid coupling as claimed in  claim 1 , wherein the pulsation absorber is provided at a first part of the fluid channel, and the first part of the fluid channel has a section smaller than a section of a second part of the fluid channel.  
   
   
       3 . A fluid coupling comprising: 
 a pulsation absorber provided in a fluid channel, and arranged to absorb pulsation of fluid to flow in the fluid channel, the pulsation absorber including:    a bellows formed by resin or rubber; and    an elastic member provided inside the bellows, including a molded member formed by resin or rubber, and arranged to deform elastically together with the bellows.    
   
   
       4 . A fluid coupling comprising: 
 a body formed with a fluid channel of a straight type, and a damping chamber branching off from the fluid channel; and    a pulsation absorber provided in the damping chamber, and arranged to absorb pulsation of fluid to flow in the fluid channel.    
   
   
       5 . The fluid coupling as claimed in  claim 4 , wherein the pulsation absorber includes a diaphragm formed by resin or rubber, and an elastic member arranged to deform elastically in conjunction with deformation of the diaphragm.  
   
   
       6 . The fluid coupling as claimed in  claim 1 , wherein the pulsation absorber includes a bellows formed by resin or rubber.  
   
   
       7 . The fluid coupling as claimed in  claim 6 , wherein the pulsation absorber includes an elastic member provided inside the bellows, and arranged to deform elastically together with the bellows.  
   
   
       8 . The fluid coupling as claimed in  claim 7 , wherein the elastic member includes at least one of a molded member formed by resin or rubber and a coil spring.  
   
   
       9 . The fluid coupling as claimed in  claim 3 , wherein the molded member is resin or rubber containing numerous bubbles.  
   
   
       10 . The fluid coupling as claimed in  claim 8 , further comprising a support fixed in the fluid channel, wherein the pulsation absorber is supported by the support.  
   
   
       11 . The fluid coupling as claimed in  claim 3 , wherein the fluid coupling is an elbow type including an elbow portion and an extension portion extending from the elbow portion, the extension portion having an open end opening in opposite direction from the elbow portion; and the fluid coupling further comprises a support fixed to the open end of the extension portion, wherein the pulsation absorber is supported by the support in the extension portion.  
   
   
       12 . The fluid coupling as claimed in  claim 11 , wherein the support is formed with an air hole arranged to expose an inside part of the bellows to open air.  
   
   
       13 . The fluid coupling as claimed in  claim 3 , wherein the molded member is formed in a cylindrical form, and is provided coaxially with the bellows.  
   
   
       14 . The fluid coupling as claimed in  claim 3 , wherein the molded member is a hollow-molded member formed in a bellows form.  
   
   
       15 . The fluid coupling as claimed in  claim 3 , wherein the molded member is formed in a thin cylindrical form; and the elastic member further includes a coil spring disposed concentrically outside the molded member.  
   
   
       16 . The fluid coupling as claimed in  claim 3 , wherein the molded member is a composite-molded member including a coil spring insert-molded in the resin or rubber forming the molded member.  
   
   
       17 . A fluid coupling comprising: 
 means for passing fluid; and    means for absorbing pulsation of the fluid by deforming in a same direction as the fluid pulsates.