Clutch for transmission power and method of manufacturing friction substance for the clutch

Abstract

The present invention relates to a clutch for transmission power. The clutch for transmission power according to the present invention includes flywheel, clutch cover and clutch disk assembly positioning between the flywheel and the clutch cover; moreover, the clutch disk assembly includes a clutch facing having main body portion formed with a center hole in the middle thereof, and a contacting portion wherein one side thereof faces the friction pad at said flywheel side and the other side thereof faces the press plate of said clutch cover, and the portion facing each other between the friction pad and the press plate is made of carbon-carbon composition; a spline hub being overlapped with one side of the clutch facing wherein a spline groove is formed in the inner diameter thereof; and a connecting means for connecting the clutch facing with the spline hub. Furthermore, the clutch disk assembly and the method of manufacturing the friction substance for clutch according to the invention can improve assemblability and reduce weight by simplifying it as a single part without using shock absorbing apparatus such as coil spring or the like on clutch disk assembly. In addition, the power transmission of an engine can be improved, and also it has an effect that an automobile can start softly and slippery does not occur even at abrupt acceleration by providing with carbon-carbon composition or carbon-silicon carbide composition having excellent shock absorption function.

1 . A method of manufacturing the friction substance for a clutch comprising the steps of: 
 performing a first thermal treatment wherein carbon fiber is thermally treated for graphitization at a first thermal processing temperature;    producing a prepreg wherein resin is sprayed on carbon fiber fabrics for forming the prepreg;    producing a preform wherein carbon fiber and resin are stacked on said prepreg for forming the preform;    producing a mold wherein the mold is formed by using a press on said preform; and    performing a second thermal treatment wherein said mold is thermally treated at a second thermal processing temperature.    
   
   
       2 . The method of manufacturing the friction substance for the clutch of  claim 1 , further comprising the step of cutting said thermally treated carbon fiber at the length of 200˜2,000 μm by using fiber-cutting machine between the first thermal treatment process and the prepreg producing process.  
   
   
       3 . The method of manufacturing the friction substance for the clutch of  claim 2 , further comprising a densification process for densifying said mold at a predetermined density using a carbonization/impregnation process for pressurizing at the carbonizing pressure of 50˜2,000 kg/cm 2  within the range of 750˜1,400° C. for 35 hours between said mold producing process and said second thermal treatment process.  
   
   
       4 . The method of manufacturing the friction substance for the clutch of  claim 3 , wherein said predetermined density is 1.3˜1.6 g/cm 3 .  
   
   
       5 . The method of manufacturing the friction substance for the clutch of  claim 1 , wherein said first thermal processing temperature is 2,000˜3,000° C. during the first thermal treatment process.  
   
   
       6 . The method of manufacturing the friction substance for the clutch of  claim 1 , said mold is composed of 20˜75 weight % of carbon fiber and 25˜80 weight % of said resin, and molded through heating within the range of 200˜300° C. in a press.  
   
   
       7 . The method of manufacturing the friction substance for the clutch of  claim 1 , wherein said second thermal treatment process is performed at the maximum temperature for 3˜5 hours under second thermal processing temperature of 1,700˜2,500° C., vacuum level of 3˜5 mmHg, and heat rising rate of 20˜100° C./hr.  
   
   
       8 . The method of manufacturing the friction substance for the clutch of  claim 1  further comprising the steps of: 
 performing a silicon powder addition process for adding silicon powder to said mold after said second thermal treatment process; and    performing a vacuum heating process for increasing the temperature within the range of 1,450° C.˜2,200° C. and maintaining it for 0.1˜5.0 hours under vacuum atmosphere.    
   
   
       9 . The method of manufacturing the friction substance for the clutch of  claim 8 , wherein said silicon powder 0.2˜5.0 times heavier than said mold in weight ratio is added during said silicon powder addition process.  
   
   
       10 . The method of manufacturing the friction substance for the clutch of  claim 8 , wherein said mold is composed of 3˜25 weight % of silicon, 10˜65 weight % of silicon carbide, and 10˜80 weight % of carbon after finishing the vacuum heating process.  
   
   
       11 . The method of manufacturing the friction substance for the clutch of  claim 1 , wherein said mold is used for any one of clutch facing, friction pad, and press pad on which friction is made in the clutch.  
   
   
       12 . The method of manufacturing the friction substance for the clutch comprising the steps of: 
 heating for creating thermal gradient between the inside and outside of said preform by mounting a heating element on a three-dimensional preform;    infiltrating reaction gas containing 1˜6 carbons per molecule inside said reactor;    producing a mold by performing reaction under a predetermined condition; and    performing a thermal treatment on said mold.    
   
   
       13 . The method of manufacturing the friction substance for the clutch of  claim 12 , wherein said predetermined condition is heat rising rate of 10˜20° C./min, reaction temperature of 700˜1200° C., reaction gas concentration of 10˜100%, and reaction pressure of 250˜1,500 mbar.  
   
   
       14 . The method of manufacturing the friction substance for the clutch of  claim 12 , wherein said thermal treatment process is performed at the maximum temperature for 3˜5 hours under second thermal processing temperature of 1,700˜2,500° C., vacuum level of 3˜5 mmHg, and heat rising rate of 20˜100° C./hr.  
   
   
       15 . The method of manufacturing the friction substance for the clutch of  claim 12 , wherein said mold is used for any one of clutch facing, friction pad, and press pad on which friction is made in the clutch.